Sprocket provided with possibility of dirt removal (versions), and belt drive system containing such sprocket

FIELD: machine building.

SUBSTANCE: sprocket provided with possibility of dirt removal includes housing (105); a lot of teeth (101) projecting out of the housing; a lot of grooves (102) in alternating location with teeth; at that, a belt tooth is arranged in each groove; cavity (103) located radially inside each groove and interacting with the groove. In addition, cavity (103) includes mounting seat (111) for support of the belt. Mounting seat (111) is located between the groove and cavity (103). Cavity (103) includes surface (104) located at angle (θ) relative to axial direction (A-A).

EFFECT: possible dirt removal.

9 cl, 5 dwg

 

The technical FIELD TO WHICH the INVENTION RELATES.

The invention relates to an asterisk system with the possibility of collecting dirt and more specifically, to the sprocket with the possibility of collecting dirt with the cavity located radially inside of each groove and communicating with the groove, the cavity contains a surface located at an angle (θ) relative to the axial direction, for removal of dirt.

PRIOR art

System power transmission belt drive is usually used for a large variety of applications, including automotive, agricultural, industrial, recreational and so on. Normal system contains the timing belt, which is concatenated with the asterisk. The system provides the transmission of large power between the leading element and a driven element through a reliable mechanical coupling between the belt teeth and grooves of the sprocket. Typically, the straps are pre-load to ensure that the teeth are not seemslike. The need for pre-load and the correct coupling between the belt and sprocket requires that the dirt was not grasped between the belt and sprocket.

Off-road bikes, also called mountain bikes, used on various types of terrain in any type of weather. In wet weather locally is th can be messy. Mud and other dirt may adhere to the frame, the tires of the bike and be captured in the drive transmission. Drive transmission usually contain chain and recently belts.

Dirt can be a problem for bikes with belt drive. Slush and dirt trapped between the belt and sprocket, can lead to system failure, jamming of the belt and premature failure of the belt.

Example solutions of the known prior art is U.S. patent No. 4805388 (1989), which opens into the cylinder 10 for harvesting, including the strap 11, 12 for harvesting of reinforced elastomeric material and an associated drive sprocket 30, and the guide pulley 50. System belt 11 or 12, the sprocket 30 and the pulley 50 may be used to move grain in the combine. The belt 11 or 12 includes a lot of wedges 20 of elastomeric material on its top surface 18 and many rownorzednych drive lugs 24 of elastomeric material on its bottom surface 19. The sprocket 30 has first and second sides 31, 32, respectively, and contains many rownorzednych, radially projecting teeth 33, separated the first and second cavities 34, 34', respectively. The first cavity 34 are open only on the first side 31 of the sprocket 30. The second cavity 34' are open only on the second side 32 of the sprocket 30. The depth D of each cavity is greater than the height H of each of the drive protrusion 24 of the belt 11 or 12, and the cavity 34, 34' are of the form, so that foreign material, such as corn, slush and ice, did not litter wheel sprocket 30 and the straps 11 or 12 and not the scrapping of the system. Each strap 11 or 12 also includes a guide pulley 50, which includes a cylindrical hub 51 having a pair of spaced apart in the axial direction radially protruding flanges 52, 53 respectively. The inner side surface 54 of the flanges 52, 53 converge towards the axis 55 of rotation of the pulley 50. Each flange 52 or 53 is interrupted in the circumferential direction of the pulley 50 to provide self-cleaning effect after clutch with its associated belt 11 or 12.

You want the asterisk with the possibility of collecting dirt with the cavity located radially inside of each groove and communicating with the groove, the cavity contains a surface located at an angle (θ) relative to the axial direction, for removal of dirt. The present invention satisfies this need.

The INVENTION

The primary aspect of the invention is to provide a sprocket with dirt removal, having a cavity located radially inside of each groove and communicating with the groove, and the cavity contains surface is th located at an angle (θ) relative to the axial direction, for removal of dirt.

Other aspects of the invention will be listed or will become apparent through the following description of the invention and the accompanying drawings.

The invention provides a sprocket with dirt removal, comprising a housing; a lot of teeth protruding from the housing; a multitude of grooves in alternate arrangement with the teeth, each groove accommodates a tooth belt; a cavity located radially inside of each groove and communicating with the groove, the cavity further comprises a seat for supporting a belt, this seat is located between the groove and the cavity; and the cavity contains a surface located at an angle (θ) relative to the axial direction.

BRIEF DESCRIPTION of DRAWINGS

The accompanying drawings, which are incorporated into and form part of the specification, illustrate preferred embodiments of the present invention and together with the description serve to explain the ideas of the invention.

Figure 1 is a side view of the grooves of the sprocket.

Figure 2 is a longitudinal section of the sprocket.

Figure 3 is a perspective top view of the sprocket and belt.

Figure 4 is a side view of the sprocket and belt.

Figure 5 represents the t of a perspective bottom view of the sprocket and belt.

A DETAILED DESCRIPTION of the PREFERRED OPTION IMPLEMENTATION

Figure 1 is a side view of the grooves of the sprocket. Timing belt 200 is concatenated with the sprocket 100. Timing belt 200 is also called wedge or synchronous belt and contains many teeth 203. Each tooth 203 passes through the width of the belt, i.e. perpendicular to the longitudinal direction. The load strap is perceived working tensile cord 201, which runs along the entire length of the endless belt. These timing belts are well-known in this field.

The sprocket 100 includes a housing 105. The housing 105 contains many teeth 101, passing radially from him. Each tooth 101 passes across the width of the sprocket and engages with the groove of the belt. Asterisk also contains grooves 102, which in turn are located between the teeth 101.

The cavity 103 is located radially inside of each groove 102 is located below each tooth belt 203. Each cavity 103 communicates with the groove 102. Each cavity 103 includes having the shape of a truncated cone surface 104.

The surface 104 is tilted relative to the axial direction. The cavity 103 and the surface 104 is used for removal of dirt trapped between the tooth belt 203 and the groove 102 of the sprocket during operation.

The surface 104, essentially, is continuous, meaning that p is a surface with no gaps or holes except those through which it communicates with the groove 102. This provides the ability to save carrying capacity torque sprocket, and otherwise it would have been aggravated, if cracks or other openings would be made in the case of the sprocket radially under the cavity 103. The sprocket 100 does not contain radially protruding hole for removal of dirt.

Figure 2 is a longitudinal section of the sprocket. The surface 104 contains the slope. The slope is relatively axial direction along axis a-A. in Other words, the axis of the conical surface 104 is aligned with the axis A-A. the Axis a-a represents the axis of rotation of the sprocket. The inclination of the surface 104 may be further described as an angle. The angle (θ) is in the range from greater than 0° to approximately 20°, but any inclination sufficient for removal of dirt from the stars, is appropriate.

Dirt shows devoted in the direction of the axis a-a of the cavity 103. Dirt can be captured between the belt and sprocket during normal operation, for example, when the vehicle is operating in dirty conditions on the roads.

The cavity 103 passes over the entire width (W) of the sprocket so that each end (115, 116) of each cavity 103 is open on each side of the sprocket (120, 121) to allow exit of dirt from the cavity with each konza or 116. In an alternative embodiment, only one end (115, 116) is open.

Figure 3 is a perspective top view of the sprocket and belt. In this figure, each cavity 103 tapers in the same direction. This means that the dirt is usually given in the same direction from each cavity, for example on one side of the bike. In an alternative embodiment, the direction of narrowing for each cavity 103 may alternate between each side of the sprocket.

Figure 4 is a side view of the sprocket and belt. Each cavity 103 has a limit of 110, where the cavity communicates with the groove 102. The restriction 110 provides a seat 111 which supports the tooth 203, while preventing the passage of the tooth into the cavity 203.

Figure 5 is a perspective bottom view of the sprocket and belt. The sprocket 100 may be connected to a drive shaft (not shown) on the protrusions 115 through the use of fasteners known in this field. Belt drive and sprocket according to the invention can be used on bicycles, engines for other industrial applications, where there is a risk of capture dirt between the belt and sprocket.

Although the invention has been described here, for specialists in this field will be obvious that changes may be made in the reconstruction and relatively parts, without departing from the idea and scope of the invention described here.

1. The asterisk with the possibility of removal of dirt containing:
the housing (105);
many teeth (101), protruding from the body;
many grooves (102) in alternating arrangement with the teeth, each groove accommodates a tooth belt;
the cavity (103). located radially inside of each groove and communicating with the groove;
moreover, the cavity further comprises a seat (111) to maintain the tooth belt, this seat is located between the groove and the cavity; and
the cavity contains a surface (104)located at an angle (θ) relative to the axial direction (a-a), the surface has the shape of a truncated cone.

2. The sprocket according to claim 1, in which the cavity further comprises an open end for removal of dirt from the cavity.

3. The sprocket according to claim 1, in which the angle (θ) is in the range from greater than 0° up to approximately 20°.

4. Belt drive that contains:
the timing belt;
sprocket, comprising a housing;
many teeth, protruding from the housing for coupling with a toothed belt;
many of grooves, each groove accommodates a tooth belt;
cavity located radially inside of each groove and communicating with the groove; and the cavity has an opening on each side of the sprocket, while p is the maturity has a surface, with the inclination relative to the axial direction for removal of dirt and the surface has the shape of a truncated cone.

5. Belt drive according to claim 4, in which the cavity further comprises a hole on each side of the sprocket.

6. Belt drive according to claim 4, in which the surface has the form pacenow cone.

7. Belt drive according to claim 4, in which the surface is continuous between each tooth.

8. Belt drive according to claim 4, further containing a seat so that the tooth cannot pass into the cavity.

9. Asterisk containing:
case;
many teeth protruding radially from the housing for coupling with the belt;
many of grooves located between the teeth, each groove accommodates a tooth belt;
cavity located radially inside of each groove and communicating with the groove, the cavity has an opening on each side of the sprocket;
moreover, the cavity has a surface, the surface is tilted relative to the axial direction, the surface has the shape of a truncated cone, aligned with the axial direction for removal of dirt;
the cavity has an open end on each side of the sprocket; and
the cavity further comprises a seat for supporting a belt, this seat is located between the groove and the floor is STU.



 

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