Sprocket with higher hoisting capacity

FIELD: transport.

SUBSTANCE: sprocket (23) has outer circular surface (26) and fulcrum pin, recesses for chain horizontal links and recesses for chain vertical links. Recesses for chain vertical links are separated by teeth 36. Side face 39 of tooth in contact with loaded chain vertical link features special profile and sizes. Chain sizes are selected so that vertical link does not come in contact with tooth side face by its front part unless definite load is applied on the chain. Contact between tooth side face and front part of chain appropriate link occurs only definite load is exceeded.

EFFECT: sprocket that allows increased load on chain links.

29 cl, 7 dwg, 1 tbl

 

The so-called kruglozerny chains consist of connected in a circuit separate round links. Respective adjacent links of the chain rotated by 90 to each other relative to the longitudinal axis of the chain. Each link in the chain krupasindhu circuit consists of a bent wire piece, the free ends of which are butt welded to each other.

When viewed from above, on the flat side, chain link consists of two straight parallel legs, each of which at each end moves in a semicircular arch. The radius of two semicircular arches corresponds to the distance from the straight sections to the center. The projection of this lying in the plane of the chain link on a plane that is parallel to the flat side of the chain link, is limited to two lines, one of which is an external line, and the other internal line. External line, respectively, consists of two straight sections that are parallel to each other, and two semicircular arches, the diameter of which corresponds to the distance between the straight sections. The inner line is the same distance corresponding to the diameter of the wire from the outside of the line at each point.

Such kruglozerny chains are used to move parts or leading elements. The latter may represent, for example, the pallets are transported along the transportation routes or circuits may be used is carried out as the host strain of the so-called chain hoists.

Kruglozerny chains are driven by sprockets, which are communicated by a method of forced engagement with the chain links. In this regard, there is a difference between the vertical chain links and horizontal chain links. This difference can be understood from the point of view of the sprocket. Below the horizontal link of the chain refers to the chain link, flat side which is turned towards the axis of rotation of the sprocket. Under the vertical chain refers to the chain link to which the flat sides perpendicular to the axis of rotation of the sprocket.

In previous traditional stars only horizontal chain links used to transmit the force from the sprocket to the chain. The vertical chain links are still not used to transmit the force to the stars and kruglozernyh chains.

From EP 0269557 A1 famous star, adapted to the change of the chain due to wear of the chain.

When the circuit is under load passes over the sprocket, between adjacent links of the chain motion occurs. This movement arises from the fact that the chain is stretched under the action of load, compelled by an asterisk to pass through all the way.

The relative movement between the links of the chain causes frictional wear, in which the thickness of the chain link is reduced in the respective fields. Under the thickness of the chain link in the Anna field of technology refers to the diameter, which has a wire in the considered point.

The chain becomes longer due to changes in the thickness of the chain link, its frequency is no longer in a step asterisks. To account for this factor, deeper under the circuit for the vertical chain links are made in a special way known in the sprocket.

Deeper under the circuit for the vertical chain links form a channel passing in the circumferential direction of the sprocket, which passes through the cavities under the circuit for the horizontal chain links. The bottom of the groove describes n-gon in the broadest sense, n is the number of the recesses under the circuit for the horizontal chain links. Each side of this regular n-gon is a circular segment of the arch with a constant radius of curvature, which is very large relative to the radius of curvature of the outer lines of the individual chain link. The bottom of the recess has a radius of curvature along its length. It just goes off on one end in a rounded corner of the n-gon, which begins the bottom of the next recess adjacent deeper under the circuit for the vertical chain link. This angle can also be considered as a tooth in a broad sense. The top of the tooth is located in the center, i.e. the center of the recess of the horizontal chain link. It ends just below the plane, which is limited to flat the second side of the chain link, nearest to the axis of rotation.

2 this publication is related to the art depicts the interaction between the vertical chain link and the associated recess under the chain, when unused to this circular link is used. Adjacent horizontal chain links to hold the vertical chain link at a distance above the bottom of the recess under the circuit for the corresponding vertical chain link. Only if the chain is lengthened due to wear, there is a small tilt of the vertical chain link, resulting in the chain link is in contact with the bottom of the recess, as facing the front part in the direction of load application.

The tangent at the contact point between the bottom of the recess and the outer line of the chain link passes under a very acute angle to the longitudinal axis of the vertical chain link, whereby it is practically impossible the application of force from the sprocket on krupasindhu circuit in place of point contact.

Known asterisk, thus, cannot use the chain more than that meets the standards in accordance with the indicators of security restrictions. Standards require that the maximum load on the circuit occurs in the field of stars.

Thus, the problem of the present invention is the creation of stars, which allows for great is th load swingaway chain from a given material compared with the combination of this link chain with a sprocket wheel in accordance with the prior art.

The designers in the company of the applicant found that a big load/utilization circuit potential(s), if the vertical chain links are also used to transmit the force from the sprocket to the chain, or Vice versa. To achieve this, the host load side tooth surface, with which the vertical chain link contacts the front part of the load application, must have a specific configuration.

A new star is, like the stars of the prior art, to drive kruglozernyh circuits or profiled steel chains, in particular for chain hoists. Each link of the link chain consists of a bent wire piece and has a flat shape. This form consists of two parallel plots and two semicircular arches.

The asterisk in accordance with the invention has a main body with an outer circumferential surface and an axis of rotation in the center with respect to the outer circumferential surface.

Deeper under the chain, located in the outer circumferential surface and adapted for receiving the horizontal links of the chain to transfer power from the sprocket to the horizontal chain links are contained in the main body.

Asterisk further comprises recesses under the chain, which are likewise located on the outer circumferential surface and p is rednaznachena for receiving the vertical chain links. The number of pits under the circuit for the vertical links of the chain corresponds to the number of recesses under the circuit for the horizontal chain links. Each recess under the circuit for the vertical chain links has a contact area, across which the corresponding link of the chain may be at least part of their direct site, connecting with a round arch. Each recess under the circuit for the vertical chain links are located between adjacent recesses under the circuit for the horizontal chain links and overlaps them.

Radial teeth designed to transmit the force from the sprocket to the vertical chain links are between adjacent recesses under the circuit for the vertical chain links. Each of the teeth is limited to two side surfaces of the tooth facing in the circumferential direction.

One of the two side tooth surfaces of each tooth is receiving the load side tooth surface, i.e. the side surface of the tooth, which has a vertical chain link when the corresponding load. This lateral surface of the tooth facing in a direction opposite to the direction of the load acting in the sectional circuit under load.

Each host load side tooth surface forms a line of curvature of the side surface of the tooth lying in the plane of symmetry, which passage is t through the groove under the circuit for the vertical chain links, and perpendicular to the axis of rotation. This plane of symmetry coincides with the plane of symmetry of the vertical chain link and is held between the two side surfaces of the tooth, which is framed by a vertical chain link. Under lateral surface refers to the surface from which the tangent is to contact the chain link on the corresponding side.

The host load side tooth surface is calculated so that the plane of symmetry line of curvature of the side surface of the tooth was at a distance from an outside line, facing in the direction of the load, semicircular arches belonging to the chain link, which is located in the groove under the chain. This distance is present when two adjacent chain link center-aligned and lie in respective recesses under the chain without any influence from external forces.

Due to the distance between the center line of curvature of the side surface of the tooth and the outer line of the semicircular arch, both of which lie in a plane intersecting the axis of rotation at right angles, clearance, bent in the form of an arch and having a tapered shape whose width increases toward the top of the tooth is formed between the front part of the chain link and the adjacent side surface of the tooth. This gap is of such a size that it is closed when a certain force acting n swingaway chain, exceeded. This closure is due to elastic deformation of the corresponding semicircular arches chain link.

For optimum transfer of force to the vertical chain link, the tooth should have the greatest possible radial height. However, the radial height is limited on one side by the selector circuit, commonly used in chain hoists, and on the other hand - the fact that there should not be obstacles tangential prevents the chain from the sprocket. Preferred conditions are achieved if the surfaces formed by the area of the side surface of the horizontal chain link, which extends the tooth, the tooth has a height of component from 0.16 to 0.75 on the thickness of the chain link.

The height of the tooth depends on the thickness of the wire used for the chain links, as it is easy to understand.

Satisfactory power transmission between krupasindhu chain and a side surface of the tooth is reached, if the side surface of the tooth is curved in two directions. Thus, a satisfactory distribution of power occurs in the lateral surface of the tooth, and in front of the chain link, due to the greater contact surface.

Under bending in two directions mean curvature whose corresponding to the Central point of curvature lies on the line passing parallel to the line of curvature of the side on which ernesti tooth at an appropriate distance from it. The radius of curvature, measured relative to this line, preferably not less than half the diameter of the wire from which made the chain link.

The distance between the front part of the chain link and receiving the load side surface of the tooth or between the outer line and the radius of curvature of the side surface of the tooth can be determined by approximation using two circles of curvature. One circle of curvature is approximated by the outer line of the semicircular arches of the vertical chain link, put in an asterisk. Thus, the center point is determined for the circle of curvature.

The second approximation is a circle approximating the line of curvature of the side surface of the tooth, and thus is determined by the other Central point. The Central point of the circle of curvature to the side surface of the tooth is displaced in the direction of application of the load relative to a center point of the circle of curvature for chain link. The offset value in turn depends on the thickness of the wire for chain link and the length of the chain link.

Two center points of the circles of curvature preferably lie on a straight line which runs parallel to straight sections of the vertical chain link.

Depending on the nature of the chain link, the passage at an acute angle may also be preferred is sustained fashion.

The line of curvature of the side surface of the tooth may be completely round, which simplifies the manufacture of the stars. The line of curvature of the side surface of the tooth may also have the same profile, which forms the external line when the chain is exposed to a given load, for example the nominal load. Upon closer examination, the profile in this case is approximately parabolic, which, however, means that it also can be defined circle of curvature along the length of the line of curvature of the side surface of the tooth. The circle of curvature can be defined as a circular line, for which the distance from the line of curvature of the side surface of the tooth is minimal, i.e. all the line represents the regression line. Distances are measured relative to the corresponding radius of the circle of curvature.

To achieve as much as possible the life of the stars, it is preferable to maintain a certain elasticity and adaptability, if it consists of a hardened steel, preferably cemented, while the wear resistance is high.

Well under the shaft, by means of which the sprocket can be placed without the possibility of rotation on the output shaft of the gear motor, preferably passes through the sprocket.

Deeper under the circuit for the horizontal chain links have the t shape of the bath.

Deeper under the circuit for the vertical chain links are limited to receiving the load side tooth surface, the side surface of the tooth, remote from the host load side surface of the tooth and the property of the adjacent tooth, and the bottom of the recess.

The bottom of the recess can probably be bent, and the axis line of curvature perpendicular to the axis of rotation. Another possibility is to use the bottom of the recess, which is flat and goes into his field, connecting with the host load side tooth surface, the curvature corresponding to that described above.

In order to prevent excessive load on the chain link in the field of welding, the bottom of the recess may include a cutout, through which the load of the weld chain link is removed.

The radius of curvature for the line of curvature of the side surface of the tooth may be equal to or exceed the radius of the circle of curvature for the outer line of the semicircular arch. The Central position of the points relative to each other should be selected so that the bottom of the recess passed tangentially, without a point of inflection, in the side surface of the tooth. The ratio of the two radii, in turn, depends on the wire diameter or the size of the chain link, and can be an indicator from 1.0 to 1.2.

To improve RAID vertical chain link on minimalsoul load side tooth surface and sbeg with her, receiving the load side tooth surface preferably enters the area of the apex of the tooth in a facet. The chamfer may have a curved or flat surface. The height of the chamfer, measured in the radial direction of the tooth, may preferably be from 0.1 to 2 mm, preferably from 0.2 to 1.5 mm

Description of the figures below is limited to the explanation of the main objects of the invention. Obviously, a valid various changes. Specialists in the art can guess about minor details that are not described in detail, in the usual manner with the aid of the drawings, which in this context correspond to the description of the figures.

The implementation of the invention represented in the drawings, showing:

Figure 1 is a chain hoist on a very schematic form in the future;

Figure 2 - chain link in the top view to the side surface of the chain link;

Figure 3 is an asterisk in accordance with the invention in the form in the future;

Figure 4 is an asterisk in section along the plane of symmetry of the recess under the chain and perpendicular to the axis of rotation;

Figure 5 - interaction between krupasindhu chain and sprocket in accordance with the invention, when the circuit is not applied load, on the basis of the section of stars perpendicular to the axis of rotation;

6 is an enlarged section view figure 5;

Fig.7 is an enlarged section view figure 5 with the other con is traccia side surface of the tooth; and

Fig - table of preferred values for determining sizes of stars depending on the circuit parameters.

As an example application of the invention, figure 1 depicts a chain hoist 1 in simplified form in the future. Chain hoist 1 has a housing 2 gearbox roughly in the form of a beam, one end surface of which the flange is attached to the motor 3 in the form of an asynchronous motor. As the housing 2 of the gearbox and the engine 3 are equipped with continuous cooling fins, as you can see in the drawing. Cover 5, containing the control unit or the main parts of the control unit, equipped on the engine 3 on the side remote from the housing 2 of the gearbox. Case 6 stars, with the upper sides of which are brackets 7 which serve for the suspension of the winch 1, is located between the cover 5 of the control unit and the opposite end surface of the housing. Krugosvetnaya circuit 8, the free end of which is fixed a hook 9, passes downwards from the housing 6 stars.

As is clear from the view in figure 1, only a force directed vertically downwards affects krupasindhu circuit 8. The direction of the force depends on whether you want to raise a load attached to the hook 9, up or prevent it from falling down. Even in the case of downward movement force in krupasindhu circuit 8 operates in the same aims and, and besides the starting of the movement, with the same magnitude as when lifting.

Krugosvetnaya circuit 8 is composed of many identical links 10 of the chain, one of which is shown for purposes of illustration, figure 2 in the top view on the flat side. The link circuit 10 consists of a round wire 11 of suitable diameter, which is bent in an oval. A piece of wire connected at the ends and butt welded in position 12. Due to the type of curvature of the chain link, get two parallel plot 13 and 14, and two semicircular arches 15 and 16. Two semicircular arches 15 and 16 move in the places marked by the dotted lines 17 and 18, in straight sections 13 and 14. The outer contour of the link circuit 10 thus forms an outside line 19 passing around the chain link. Thanks to this form, the outer line 19 describes a semicircle in the field of two semicircular arches 15 and 16, the Central point of which lies on the dotted lines 17 and 18, respectively, and is centered between the two straight sections 13 and 14. The Central points are marked 21 and 22 in figure 2.

Adjacent chain links will be placed with their flat sides vertically relative to the plane of the drawing, if they are shown in the connection shown by chain link.

3 and 4 depict the sprocket 23 type located in the case of 6 stars, and without a possibility of rotation planted on the output shaft of the gearbox 2. When SIP the soup such sprocket 23, which internally communicates with krupasindhu circuit 8, the power created by the hook 9, is converted into rotational motion of the output shaft, or Vice versa.

The sprocket 23 has a main body 24 in the form of a short cylinder, which is limited by two parallel flat surfaces 25, only one of which is visible in the drawing. Cylindrical circumferential surface 26 is held between the flat surfaces 25. Shaped through hole 27 passing through the sprocket 23 on the flat surface 25 to the other, made coaxial circumferential surface 26. Connection without the possibility of rotation with the respective output shaft of the gearbox is achieved by profiling the holes 27.

In the example shown, four recesses 28 under the circuit for the horizontal chain links are made one after the other in the circumferential surface 26. The recess 28 under the chain are distributed along a circumferential surface of the through the same distance, coaxial through-hole 27. Their distance from each other corresponds to the distance between the links 10 of the chain lying in the recesses 28 under the chain, if the corresponding krugosvetnaya circuit 8 will be placed without weakening or tension.

Below the horizontal chain link specialists in the art involve the chain link, oriented so that the flat is in Auron turned towards the observer in figure 2, drawn to an axis of rotation, i.e. to the Central axis of the through hole 27.

The recess 28 under the chain are identical to each other in shape. They have the form of baths and is limited to the bottom 29 of the recess, and the wall 31. The wall 31 terminates at the height of the outer circumferential surface 26.

Profile wall 31 corresponds to the profile of the external line 19 level 10 chain located in it. Perpendicular to the district towards the wall 31 forms a contact or end surfaces 32 and 33, which may consider contacting element 10 of the electric circuit of the outer side of the round arch 15 or 16 when it is under load. The forced engagement between the sprocket 23 and the horizontal chain links 10 of the chain, located in the recesses 28, is carried out by means of end surfaces 32 or 33, depending on the direction of impact.

The bottom 29 of the recess is flat, which corresponds to the smooth flat side of the horizontal chain links 10 of the chain.

Because of the cross-location chain in krupasindhu chain, the chain, connecting the horizontal chain links must be positioned vertically, i.e. a flat surface, parallel to the plane in figure 2, is perpendicular to the axis of rotation of the sprocket 23. To accommodate the vertical chain links 10 of the chain sprocket 23 contains complement the performance communications deepening under 35 chain, which number corresponds to the number of recesses 28 under the circuit for the horizontal chain links. As shown in the drawings, the recesses 35 under the chain are located so that they overlap the recess 28 under the chain in the circumferential direction. In principle, recesses 35 under the circuit consists of a groove, passing in the circumferential direction, a width corresponding to the thickness of the link circuit 10, and the teeth 36 are radially outward from the groove after a preset interval. Thus, recesses 35, likewise, have the form of baths and is limited to two parallel flat side surfaces 37, only one of which can be seen on the figure 3 and 4. The distance of the lateral sides 37 from each other slightly greater than the thickness of the link 10 of the chain.

Tooth 36 may have a width in the field, which acts radially over the surfaces 38, which is only slightly less than the distance between the straight sections 13 and 14 of the element 10 of the chain.

Deepening under 35 circuit is further limited to the bottom 38 of the recess and two side surfaces 39 and 41 of the tooth.

Because the vertical chain links in accordance with the invention should be used for the transmission of force between the sprocket 23 and krupasindhu circuit 8 and the force always has the same direction, only one side surface of the tooth is always receiving the load or transmission load is at. For further explanation of the invention it is assumed that the lateral surface 39 of the tooth will be called below the receiving load with the side surfaces of the tooth.

For completeness it may be mentioned that the cutout 42, receiving the weld seam 12 may be contained in the bottom 28 of the recess. Thus, the boundary of each recess 35 under the circuit consists of a flat bottom 38 of the recess, with the exception of the recess 42, which gradually turns at both ends in the lateral surfaces 39 and 41 of the teeth. On both sides of the cutout 42 of the bottom 38 of the recess forms the straight sections, i.e. sections lying on a tangent. In this case, direct is not necessarily flat. Like the side surfaces 39 and 41 of the tooth, the bottom 38 of the recess may also contain a curvature about an axis which lies in the plane of Fig. 4. In other words, the bottom 38 of the recess may also be a hollow, whose radius of curvature slightly greater radius of curvature of the wire which is used to level 10 chain.

Interaction krupasindhu circuit 8 with a sprocket wheel 23 shown in figure 5.

The plane of symmetry of the recess 28 under the chain, which is perpendicular to the axis of rotation of the sprocket 23 is a plane of symmetry of the recess 35 under the chain, and also the plane of symmetry of the links 10 of the chain, when they lie in the recesses 28 and 35 under the chain.

In Fig. 5 shows a sprocket 23, the cut is along this plane of symmetry, as shown in figure 4. The horizontal chain links 10 of the chain similarly cut along this plane of symmetry, i.e. in the plane perpendicular to the plane of figure 2 and passing through the center point 21 and 22.

Figure 5 the chain denoted by the reference position 10 and additionally lower letters for better distinction from each other. The description of figure 2 applies to all of them.

As can be seen in figure 5, krugosvetnaya chain comes in a counterclockwise direction at a tangent with the sprocket 23. Link 10A circuit has almost disappeared from the sprocket 23 and points downward in the direction of the load. Horizontal link circuit 10b is connected to the link circuit 10d by means of connection with the link circuit 10C. As a result of load, link 10d chain rests on the front wall 33 of the recess 28 under the chain. The following vertical link of the 10th circuit is almost no load in the next recess 35 under the chain in the direction of counterclockwise.

This image lasts as long as in the field of return branches krupasindhu circuit 8, the sprocket 23 will not rise to return to the place of storage, which is not shown.

The situation is of vital importance for the understanding of the invention, occurs when krugosvetnaya circuit 8 comes with sprocket 23 on the side of the loaded branches and, in particular, where the upper th is santalene link circuit 10b is held vertical element 10C circuit, above him, while the link 10b chain cannot itself be supported on other parts of the sprocket.

As seen in the drawing, the transmission power in the angular position of the sprocket 23, as shown, is carried out essentially by the forced engagement of the front wall 33 of the recess 28 under the chain interconnecting the front part, i.e. with the adjacent semicircular arch, level 10s chain. Link 10d chain rests on the front wall 33 of both sides of the recess 35 under the chain, which is cut through the front wall 33.

Figure 6 depicts, in enlarged representation of the section, the engagement between the front part of the vertical chain link, link circuit 10C, for example, and receiving the load side surface 39 of the adjacent tooth 36. All the details, of no importance for explaining the engagement, were omitted in the representation of figure 6. Moreover, the ratio of the dimensions are greatly exaggerated for those elements that are important to distinguish. Cross-section through the sprocket 23 is held in the plane of symmetry perpendicular to the axis of rotation of the sprocket. This plane is the previously mentioned plane of symmetry, which passes through the center between the two side surfaces 37 of the recess 35 under the chain. Thus, it is also, except for the inclined bevel, centered between two parallel lateral surfaces of the link 10C C is PI. These surfaces are formed by the tangent plane at which the link circuit 10C is held from both sides parallel to the plane in accordance with figure 2 or 6. In this specified section plane receiving the load side surface 39 forms a line of curvature 45 side surface of the tooth, which is the opposite outside line or outside of the contour line 19 in the circumferential direction (again with the exception of the slope).

The line of curvature of 45 side surface of the tooth is a round arch, which reaches the top of the adjacent tooth 36 and extends tangentially to the bottom 38 of the recess. The Central point of the circle, the line bounding the curvature of 45 side surface of the tooth, is a point marked position 46, i.e. the Central point 46 is slightly offset, parallel to the bottom 38 of the recess relative to the center point 21 in the direction of load application. The magnitude of the displacement, i.e. the distance between two center points 21 and 46 depends on the size of the link circuit 10. The preferred value of the distance between the Central points are listed in the table on Fig below, depending on the size of the link 10 of the chain.

The circle describing the line of curvature of the side surface of the tooth has the same diameter as the semicircular arch 15, 16.

When sizing this distance was assumed that krugosvetnaya chain was HEPA is designed, no signs of wear. It was located without the application of force on the sprocket 23, i.e. horizontal units 10b and 10d chain lying symmetrically in their recesses 28 under the chain. Vertical link 10C circuit also symmetrically placed between the last two, so that the position of the center point 21 as a center of curvature outside line 19 is stored in such a way.

As follows from the table, the wedge shape, the resulting displacement of the center point is very small. Its size is primarily determined so that at rated load on the chain in the situation shown in figure 5, the vertical link circuit 10C, following immediately behind the horizontal part 10b of the chain, pulled them under the simultaneous action of elastic deformation. Due to this deformation, the vertical link circuit 10C is in contact with the side surface 39 of the tooth to its front part, i.e. a part of the semicircular arch, facing in the direction of load application. That is, when the load value is above this value, the power transmission between the sprocket 23 and krupasindhu circuit 8 will also be carried out by means of the vertical chain links. Power transmission is no longer done only by means of horizontal chain links and the front contact surfaces 33, as in the case of the prior art.

It turned out that when identical as a chain, a chain which can be used at higher values of load in this configuration. Compared with the rated load in other cases, it may increase the load up to 25% without increasing the risk.

Additionally it was found that this new star provides increased safety and less wear on the chain.

In the above description, it was assumed that the chain 8 is krupasindhu a circuit in which the individual chain links, as explained several times, made from cut round wire. Accordingly, it is preferable that the host load side surface 39 of the tooth was bent in two directions. This means, on the one hand that it is curved in accordance with the circle of curvature, and, on the other hand, what constitutes for receiving the load side surface 39 of the tooth is a round arch with a diameter that is slightly larger than the diameter of the wire from which it is made krugosvetnaya chain. The number of surface pressure is reduced.

The same thing can be done in the area of the bottom of the recess.

In the interests of improving duty link chain, attempts to use profiled wire instead of round wire for the manufacture of chain links. Profiled wire consists of a round arch sections and areas of the square. In other words, it has a square section, which is adjacent the Rani on one side replaced quarters of a circle.

Invented the design receiving the load side surface 39 of the tooth may also be used with this type of circuit. Receiving the load surface, thus, no longer bent in two directions, as indicated above for krupasindhu chain; instead forming for receiving the load surface 39 of the tooth is a straight line parallel to the axis of rotation along the line of curvature of the side surface of the tooth.

Ultimately, the raw steel of adequate strength, which is not subjected to subsequent thermal treatment. In this respect, much lower prices.

Shown asterisk have wells to be placed on the shaft. Also provided by the design of the sprocket with built-in shaft.

In the above description was taken that only the side surfaces of the teeth in one direction of rotation can be considered as receiving the load side surfaces and have a profile and dimensions in accordance with the above description. The profile of the opposite side surface of the tooth, which takes the load in the respective direction of rotation, is of secondary importance. Its dimensions are chosen so as to obtain as much as possible the resistance of the tooth.

If the power base of the tooth is sufficient, which you can also construct a new sprocket in two directions, i.e. to use the above described geometry and sizing not only to the side surface 39 of the tooth, but also to the side surface 41 of the tooth, and thus, to use the circle of curvature, the center point 47 which is shifted in the other direction relative to a center point 22, if the load is not acting to the left, figure 6, and operates to the right.

Depending on the situation it may be preferable, if the radius of curvature lines 45 side surface of the tooth more than the radius of the outer contour line 19. In this case, the Central point 46 or 47 is shifted further upward relative to the shown example. The amount of offset ensures that the line of curvature of 45 side surface of the tooth continues to move at a tangent to the bottom 38 of the recess.

7 depicts another embodiment of the invention. The desired distance between the outer contour line 19 of the link circuit 10C and the adjacent side surface 39 or 41 tooth is not achieved here by shifting circles of curvature, as in the above example in accordance with 6. Instead, distance is achieved here in such a way that the line of curvature of 45 side surface of the tooth forms a circle of curvature whose radius is increased in accordance with table 8, for example, relative to the radius of the outer contour line 19 in the area of semicircular arches 15, 16.

Because the points of inflection, which otherwise can cause dents on the outer side of the link 10 of the circuit, to avoid the Central point 46 is displaced along the dividing lines 17 or 18 away from the bottom 38 of the recess. Thus, the bottom 38 of the recess passes to the line of curvature of 45 side surface of the tooth so that its straight section is directed tangentially, and, thus, has no points of inflection. The Central point 21 and 46, therefore, lie on the dividing line 17, which separates the semi-circular arch 15 from straight sections 12, 13, while the center point 47 of curvature lies on the dividing line 18, which separates the straight sections 13, 14 of semicircular arches 16. The distance between the Central points 21, 46 22, 47, respectively, corresponds to the difference in radius.

In other respects the operation of this variant is the same as described above in detail.

Ultimately, there is also the choice of the size of the line of curvature of the side surface of the tooth that is different from the area round arches, but instead giving her a form which accepts the outer contour line 19 in this area under load. In this case, the circle of curvature offset from each other in accordance with 6 and above table, can be defined as the line of curvature of the side surface of the tooth and the outer contour line. These circles of curvature p is establet approximating a circle, which can be obtained by regression analysis in accordance with the concept of medium squares, for example. The distances are measured and fit to a circle of curvature are starting with a radius corresponding to an imaginary circle. The table is designed and tested for rated tension 160 N/mm2.

The height of each tooth 36 is exposed to the conflicting properties of a good operational characteristics of the circuit 8 and to maximize the path of rotation along which power is transmitted between the asterisk and the vertical chain link. Preferred values for the height of the tooth 36 lie between 0.16 and 0.75 thickness of the wire, which made the link circuit 10. Height is measured as the distance between the plane and the apex of the tooth. The plane of reference is the tangent plane at the lower side surface of the horizontal chain link, through which passes the tooth 36.

The status of the RAID and sbeg can be improved if the tooth 36 is equipped with a chamfer at its top. The height and width of the chamfer is from 0.1 mm to 1.5 mm

The asterisk for zinevych circuits, for example kruglozernyh circuits or profiled steel chains, has deeper under the circuit for the horizontal chain links. Also have deeper under the circuit for the vertical chain links. Deeper under the circuit for the vertical chain links are separated from the other teeth. Lateral surface of the tooth which contacts the vertical chain link under the action of load, has a certain profile and size. The size is chosen so that up to a certain load on the vertical chain link of the chain is not in contact with the side surface of the tooth to its front part. The contact between the side surface of the tooth and the front part of the respective chain link occurs only when the load exceeds the specified value.

1. The asterisk (23) for actuating zinevych chains (8), for example kruglozernyh circuits or profiled steel chains, in particular, for chain hoists (1), in which each link (10) the circuit consists of a bent wire and has a flat shape consisting of two parallel sections (13, 14) and two semi-circular arches (15, 16), with the main body (24)having an external circumferential surface (26) and the axis of rotation,
with grooves (28) under the chain, located in the outer circular surface (26) and intended to receive the horizontal chain links (10) chain for transmitting power from sprocket (23) to the horizontal chain links (10) chains, with grooves (35) under the chain,
located in the outer circumferential surface (26),
which are designed to receive the vertical chain links (10) chain,
which number corresponds to the number of recesses (28) under the chain to the horizon the social chain,
each of which has a reference region (38) for the vertical chain links, for which the corresponding element (10) of the circuit can rely on, at least part of their direct site, connecting with a round arch (15, 16), and
one of which is located between every two adjacent recesses (28) under the circuit for the horizontal chain links (10) chains, crossing these grooves (28) under the chain, and
with teeth (36),
one of which is located between every two adjacent recesses (35) under the circuit for the vertical chain links (10) chain,
which are designed to transmit the force from the sprocket (23) to the vertical links (10) chain, and
each of which is limited by two side surfaces (39, 41) of the tooth facing in the circumferential direction, at the same time as receiving the load side surface (39) of the tooth, at least one of two side surfaces (39) of the tooth each tooth (36) facing against the direction of load in the link chain (8), when the asterisk (23) is used in the operating mode, each receiving the load side surface (39) of the tooth forms in the plane of symmetry of the recesses (35) under the circuit for the vertical chain links (10) chain that is perpendicular to the axis of rotation, the line of curvature (45) side surface of the tooth, which at least approximately corresponds to the curved profile of the outer line (45) adjacent the semi-circular arch (15), facing in the direction of the vertical load of the link (10) chain, which is located in the corresponding recess (35) under the chain, and
however, the situation of receiving the load side surface (39) of the tooth is defined so that the line of curvature (45) side surface, measured in the plane of symmetry, separated by a distance at least in the vicinity of the top of the tooth, from an outside line (19) semicircular arches (15, 16) of the link (10) chain, located in the corresponding recess (35) under the chain, if two adjacent link (10) chain centered and lie in their respective recesses (28) under the chain without exposure to external forces, and, accordingly, in the absence of the offset between links (10) chain.

2. The sprocket according to claim 1, characterized in that above the surface formed by the side surfaces of the horizontal link (10) of the chain closest to the axis of rotation, the tooth (36) has a height of component from 0.16 to 0.75 on the thickness of the chain link.

3. The sprocket according to claim 1, wherein receiving the load side surface (39) of the tooth is curved in two directions.

4. The sprocket according to claim 3, characterized in that the curvature has a radius not less than half the diameter of the wire which is used to link (10) of the chain.

5. The sprocket according to claim 1, characterized in that the outer line of (19) semicircular arches (15, 16) of the vertical link (10) chain, placed in Zvezdochka is (23), form at least approximately a circle of curvature of the chain link with the Central point (21, 22), and line curvature (45) side surface of the tooth receiving the load side surface (39) of the tooth forms a circle of curvature of the side surface of the tooth with the Central point (46, 47), with the Central point (46, 47) of the circle of curvature of the side surface of the tooth offset from the center point (21, 22) of the circle of curvature of the chain link.

6. The sprocket according to claim 5, characterized in that the displacement occurs in the direction of load application.

7. The sprocket according to claim 5, characterized in that the connecting line between the two center points (21, 46; 22, 47) runs parallel to straight sections (13, 14) of the vertical link (10) of the chain.

8. The sprocket according to claim 5, characterized in that the connecting line between the two center points (21, 46; 22, 47) is held at an acute angle to the longitudinal axes of the straight sections (13, 14) of the vertical link (10) of the chain.

9. The sprocket according to claim 5, characterized in that the connecting line between the two center points (21, 46; 22, 47) is held at right angles to the longitudinal axes of the straight sections (13, 14) of the vertical link (10) of the chain.

10. The sprocket according to claim 5, characterized in that the distance between the Central points (21, 46; 22, 47) of the circles of curvature is from 0.06 to 0.1, preferably from 0,082 to 0,096, the diameter ol the portages link (10) of the chain.

11. The sprocket according to claim 1, characterized in that the line of curvature (45) side surface of the tooth is properly round.

12. The sprocket according to claim 1, characterized in that the line of curvature (45) side surface of the tooth has the same profile as the outer line of (19) semicircular arches (15) link (10) of the circuit at rated load and nearest to the receiving load-side surface (39) of the tooth.

13. The sprocket according to claim 1, characterized in that it consists of a hardened, preferably cemented, or raw steel.

14. The sprocket according to claim 1, characterized in that it contains a hole (27) under the shaft, by means of which it can be planted without the possibility of rotation on the output shaft of the gearbox (2, 3).

15. The sprocket according to claim 1, characterized in that the recesses (28) under the circuit for the horizontal chain links (10) chains are in the form of a bath.

16. The sprocket according to claim 1, characterized in that the recess (35) under the circuit for the vertical chain links (10) chains formed by receiving the load side surface (39) of the tooth lateral surface (41) of the tooth adjacent the tooth (36)facing the receiving load-side surface (39) of the tooth, and the bottom (38) of the recess.

17. The asterisk on item 16, characterized in that the bottom (38) of the arcuate recesses, with the axis of curvature lies at right angles to the axis of rotation.

18. The asterisk on item 16, characterized in that the bottom (38) of the recess is flat.

19. The asterisk on item 16, characterized in that the bottom (38) of the recesses has a cutout (42) in the center to release the welded seam (12) of the link (10) of the chain.

20. The sprocket according to claim 1, characterized in that the radius of curvature for the line of curvature (45) side surface of the tooth is greater than the radius of the circle of curvature for an outside line (19) semicircular arches (15, 16).

21. The asterisk in claim 20, characterized in that the ratio of the radii ranging from 0.08 to 0.3 of the diameter of the wire.

22. The asterisk in claim 20, characterized in that the ratio of the radii is between the index of 1.0 and 1.2.

23. The sprocket according to claim 1, wherein receiving the load side surface (39) of the tooth moves toward the tooth tip in a facet.

24. The asterisk in item 23, characterized in that the height of the chamfer is from 0.1 to 1.5 mm, depending on the diameter of a wire link (10) of the chain.

25. The sprocket according to claim 1, characterized in that the asterisk (23) has an integer continuation of the shaft.

26. The sprocket according to claim 1, characterized in that region, which is above the bottom (38) of the recess of the horizontal link (10) of the chain, the teeth (36) have a width that is only slightly less than the distance between the straight sections (13, 14) of the link (10) of the chain.

27. The sprocket according to claim 1, characterized in that at a certain tension force greater than 0 N/mm2preferably from 100 to 75% of the nominal tension is Janeway circuit (8), the distance between the center line of curvature (45) side surface of the tooth and the external line (19) semicircular arches (15, 16) is reduced to zero.

28. The asterisk in item 27, characterized in that the nominal tension ranges from 320 to 80 N/mm2preferably from 200 to 100 N/mm2.

29. The asterisk in item 27, characterized in that the nominal tension is calculated from the rated capacity of the chain drive, not taking into account the dynamic component, and the cross-sectional area of the wire of the chain link.



 

Same patents:

FIELD: machine building.

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FIELD: mechanical engineering.

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1 dwg

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FIELD: machine building.

SUBSTANCE: invention refers to general machine building and can be implemented in any of its branches where mechanic gears of rotary motion are used. The chain gear consists of two or more wheels-gears connected with chain (3). The gear corresponds to a unit wherein gear rim (K) consists of a set of separate sector parts connected with disk (4) of a gear with fit ring (6). Connections of gear rim (K) with disk (4) and fit ring (6) contain a system of slots and lugs facilitating adjustment of diametre of initial circumference of the gear and consequently its step bringing it to correspondence with the step of the chain by its wear. Adjustment is carried out with angular turn of the disk relative to the fit ring with tap wrench (8) with gear.

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3 dwg

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SUBSTANCE: invention relates to rotary device for chain drive or rotary device for extraction or transportation devices incorporating chain traction. Rotary device for chain and chain wheel incorporated therewith are proposed. Note here that lateral surfaces of bends in chain belt horizontal links are lower, in every case, than equatorial line, and that they represent concaved recess, while receiving horizontal recesses of chain wheel have their lateral surfaces of teeth made barrel-like protruded to mate concaved lateral surfaces of aforesaid bends.

EFFECT: reduced specific compression force between to parts.

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EFFECT: simplified design, better distribution of forces at chain loading bearing links.

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SUBSTANCE: guiding roller (8) for link chains, for example, for round-link chains or chains out of profile steel, has recesses (28) along perimetre for horizontal links of chains and recesses (35) for vertical links of chains. Recesses (35) for vertical links of the chains are separated from each other with teeth (36). Sides (39, 41) of teeth (36), where a vertical link of the chain adjoins under load, are calculated and profiled by a special procedure. The calculation ensures a gap between the vertical link of the chain with its front part and the side surface of the tooth untill the chain is loaded to a specified load. Side surface of the tooth and front part of the corresponding vertical link of the chain contact only after specified load onto the chain.

EFFECT: raised efficiency of chain.

29 cl, 7 dwg, 1 tbl

FIELD: transport.

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EFFECT: sprocket that allows increased load on chain links.

29 cl, 7 dwg, 1 tbl

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