Stop ring for hydraulic cylinder

FIELD: instrument making.

SUBSTANCE: invention is related to stop ring used in hydraulic cylinder to fix cover to cylinder body. Stop ring is installed in hydraulic cylinder, having chamber with elliptical shape of cross section, and fixes covers that are installed at ends of mentioned body of cylinder. Stop ring comprises bent section, which is installed on surface of internal wall of cylinder chamber and is bent along surface of internal wall of cylinder chamber, a pair of straight sections that diverge from both ends of bent sections and passing parallel to each other, and a pair of convex sections installed on mentioned straight sections and having openings.

EFFECT: invention provides for improved reliability of hydraulic cylinder chamber cover fixation with elliptical shape of cross section.

7 cl, 15 dwg

 

The SCOPE of the INVENTION

The present invention relates to stoparea ring used in the cylinder in which the piston is displaced along the axial direction when the flow of the operating fluid, for fastening the covers to the body of the cylinder in which the piston.

The PREVIOUS LEVEL of TECHNOLOGY

Known hydraulic cylinder having inside the piston, moving with the flow of the working fluid is used, for example, as a device for moving the various parts. In the design of such a cylinder has a piston, which is placed with the possibility of displacement inside the chamber of the cylinder that forms the inner part of the tubular housing cylinder having a mainly circular cross-section, and on both ends of the cylinder barrel respectively set cover, thereby closing the chamber of the cylinder.

In such a hydraulic cylinder, for example, as stated in Japanese Publication laid patent application No. 10-318213, cover, fixed to the body of the cylinder is connected through the retaining ring in the annular grooves which are formed on the inner peripheral surface of the cylinder chamber, while retaining rings protruding beyond the surface of the inner wall of the chamber. Retaining rings are approximately C-shaped cross-section, contain the hole and create a force of elasticity,which extends the locking ring in the radial direction.

On the other hand, as stated in Japanese Publication laid patent application No. 2003-088937, this type retaining rings may contain a pair of holes at the open ends of the snap ring. Into this hole is inserted the machine tool retaining rings are deformed so that their open ends are displaced in directions to each other. As a result, the retaining ring with C-shaped part of the cross-section is deformed and reduced in diameter, thereby retaining ring can be installed in the annular groove present on the inner surface of the cylinder chamber.

Cylinder, in which is located above the retaining ring may contain the body of the cylinder chamber of a cylinder having an elliptical cross-sectional shape, with the main axis of the cylinder receptacle is held in the horizontal direction. When using the piston, which also has an elliptical cross-sectional shape and moves inside the chamber of the cylinder, it is possible to realize a flat thin shape. In this case, since the cover also have an elliptical cross-sectional shape, it is possible to lock the rings to form a pair of straight sections corresponding to the cross-sectional shape of the chambers of the cylinder, while the straight sections will be to join the fields chamber of the cylinder with a flat surface, Kotor which has an elliptical cross-sectional shape, and the curved portion of the locking rings will be adjacent to the arcuate region chamber of the cylinder.

However, in the locking rings having such straight sections and openings on both end parts, which can warp machine tool inserted into these holes, there is a danger that the amount of deformation of the curved section may be too small, because the holes and the curved section are separated from each other. In the result, the deformation of the retaining rings to the preset value and install retaining rings on the camera cylinder having an elliptical cross-sectional shape will be difficult.

In addition, even if you could set mentioned retaining rings with C-shaped part of the cross section respectively in arcuate region chamber of the cylinder, thereby fixing each of the covers by a pair of retaining rings, there is a danger that the clamping force may be reduced, since the retaining ring will in this case be connected through the annular groove only with the curved part of the cylinder chamber.

SUMMARY of the INVENTION

The General purpose of this invention is to provide a retaining ring for hydraulic cylinder, which can be securely installed to connect the cover to the housing cylinder having a camera Qili the DRA with elliptical cross-sectional shape.

These and other features and advantages of the present invention will become clearer from the following description presented in conjunction with the accompanying figures of the drawings, which illustrate examples shown the preferred embodiment of the present invention.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 - image view in perspective of a hydraulic cylinder with a locking ring in accordance with the implementation of the present invention;

Figure 2 - exploded perspective view of the cylinder shown in figure 1;

Figure 3 - General view of a vertical cross section of the cylinder shown in figure 1;

Figure 4 - exploded vertical cross-section of the cylinder shown in Figure 3;

5 is a lateral projection from the front cover of the cylinder shown in figure 1;

6 is a lateral projection on the cap side of the piston rod of the hydraulic cylinder shown in figure 1;

7 is a perspective, showing the retaining ring, shown only in figure 2;

Fig - the horizontal projection of the locking ring shown in Fig.7;

Fig.9 is a perspective representation showing the retaining ring in accordance with the first modified example;

Figure 10 is a lateral projection provided with the front cover of the cylinder, which is equipped with a lock Kohl is about, shown in Fig.9;

11 is a lateral projection presented on the cover side of the piston rod of the hydraulic cylinder, which is equipped with a lock ring shown in Fig.9;

Fig is an external perspective showing a condition in which the retaining ring in accordance with the second modified example is installed in the cylinder;

Fig - horizontal projection, showing the retaining ring shown only on Fig;

Fig - lateral projection, provided by the front cover of the cylinder shown in Fig;

Fig - side projection is presented on the cover side of the piston rod of the hydraulic cylinder shown in Fig.

DESCRIPTION of the PREFERRED embodiments of the INVENTION

Next, with reference to the accompanying figures of the drawings will be given a detailed explanation of the preferred embodiment, the locking ring in accordance with the present invention, which is used in the cylinder.

In figure 1, under item 10 is specified cylinder that uses a retaining ring in accordance with one implementation of the present invention.

As shown in Figure 1-4, the hydraulic cylinder 10 includes a main cylinder (cylinder body) 12 of tubular shape, the front cover (closing part) 14 mounted on one end of the main cylinder 12, the cover stock (closing det is l) 16, mounted on the other end of the main cylinder 12 and the piston 18 posted with the possibility of bias within the main cylinder 12.

The backbone of the cylinder 12 has a generally rectangular shape in cross section and contains the channel cylinder (chamber of the cylinder 20, having mostly elliptical cross-sectional shape and passing in the axial direction inside the main cylinder 12. Luggage cylinder 20 has a cross-section, mostly elliptic shape and is located so that its main axis runs in the horizontal direction (when the cylinder 10 is oriented as shown in Figure 5 and 6), and at both ends of the feed cylinder has a pair of grooves 22A, 22b, which are elongated in the width direction from the center channel of the cylinder 20.

On both end parts respectively formed of a pair of grooves 22A and 22b so that the grooves 22A, 22b are deepening arcuate shape and are mainly in the horizontal direction relative to the main cylinder 12. More specifically, the grooves 22A, 22b are located against each other, they just extended in directions from the center channel of the cylinder 20. In this case, the radius of curvature of the grooves 22A, 22b is made smaller than the radius of curvature of the two end parts of the channel of the cylinder 20.

In particular, the inner peripheral surface of the feed cylinder 20 is made that is, both end parts of the channel of the cylinder 20 exceeds the relevant portions of the grooves 22A, 22b. In addition, between the grooves 22A, 22b and the Central region, along the axial direction of the cylinder chamber 20, are the stoppers 24.

In addition, both ends of the channel of the cylinder 20 along its inner peripheral surface toward the grooves 22A, 22b are formed respectively annular grooves (installation grooves) 26. In the annular grooves 26 respectively installed retaining rings (set elements) 28a and 28b.

In addition, on the inner surface of the main cylinder 12 is formed of a pair of first and second hydraulic channel 30 and 32 through which is fed and from which comes the working fluid. While the first and second hydraulic ports 30, 32 are separated from each other by a given distance along the axial direction of the main cylinder 12 and communicated respectively with the channel of the cylinder 20 through the supply channel 34 (see figure 3). Accordingly, the working fluid supplied to the first and second hydraulic ports 30 and 32, passes through the supply channels 34 and enters the channel of the cylinder 20. In addition, on the outer side surface of the main cylinder 12, along its axial direction (in the direction of the arrows a and b), through several sensory grooves 36, which can be installed with nary, allowing to detect the position of the piston 18.

The front cover 14 has a cross-section, mostly elliptical shape corresponding to the shape of the channel of the cylinder 20, and is installed at one end (in the direction of the arrow a) of the main cylinder 12. There is also a pair of protrusions 38A, which act on a given length from the outer peripheral surface on both side parts in accordance with the location of the grooves 22A in the channel of the cylinder 20. The projections 38A are located on both side of the front cover 14, forming the outside arcuate bulge to a predetermined radius of curvature corresponding to the curvature of the grooves 22A (see Figure 5).

In an annular groove on the outer peripheral surface of the front cover 14 is installed sealing ring 40. When the front cover 14 is inserted into the channel of the cylinder 20 of the main cylinder 12, the latter will be supported in a sealed state due to the abutment of the sealing ring 40 to the inner peripheral surface of the channel of the cylinder 20.

Similarly, the front cover 14, the cover of rod 16 has a generally elliptical shape in cross section corresponding to the channel shape of the cylinder 20, and the cover is installed on the other end (in the direction of arrow C) of the main cylinder 12. In addition, formed a pair of projections (first projections) 38b, which act on the ass is nnow length from the outer peripheral surface on both side parts in accordance with the location of the grooves 22b of the channel of the cylinder 20. The projections 38b are located on either side of the lid rod 16 forming outside arcuate bulge to a predetermined radius of curvature corresponding to the curvature of the grooves 22b (see Fig.6).

In the Central part of the cover of the stem 16 is formed the channel of the rod 42, which runs along the axial direction, and in the channel of the rod 42 is introduced to the piston rod 44 connected to the piston 18. Inside the channel of the rod 42 is set rod seal 46 and sleeve 48, which provides thereby the tightness inside the channel of the cylinder 20.

On the outer peripheral surface of the cover rod 16, in the Central part of the groove, there is a seal ring 40 is installed in the axial direction of the cover shaft 16. On the end part, symmetrically with the protrusions 38b, there are several (e.g. six) of the guide elements 49, separated at a predetermined distance between the elements has an annular groove (see Figure 2). Guide members 49 are at a predetermined height above the peripheral outer surface so that upon introduction of the cap rod 16 in the channel of the cylinder 20 guide members 49 ov contact with the inner peripheral surface of the channel of the cylinder 20. In other words, the guide members 49 are of the form, which corresponds to the inner peripheral surface of the channel of the cylinder 20. The number is upravlyaushih elements is not limited to any particular number, if only this number is equal to or greater than four, and guide members 49 are mutually distant from each other at predetermined distances.

Due to the above, when the cover of rod 16 is inserted into the channel of the cylinder 20, a cover of rod 16 is directed into the channel of the cylinder 20 several guide elements 49, the lid shaft 16 is properly installed in the radial direction within the channel of the cylinder 20. As a result, the Central axis of the channel of the cylinder 20 and the axial line of the cap of the stem coincide with each other, and the piston rod 44, which passes through the channel of the cylinder 20 may be introduced into the channel of the stem 42 of the cover of rod 16 will pass through it accurately and with high precision.

The piston 18 has a generally elliptical shape in cross section. On the outer peripheral surface of the piston 18 has a pair of sections with a flat surface 50 and a pair of arcuate sections 52 that extend beyond the outer side, have given radius of curvature and is connected to both end sections of the flat surface 50. On the outer peripheral surface is set piston seal 54 and the magnetic piece 56, while the magnetic piece 56 is closed, the piston cap 58. The outer peripheral surface of the piston cover 58 lies on the same surface, and the outer peripheral surface of the piston 18.

Also, in the inner part of the piston 18 is formed piston channel 60, which passes in the axial direction (in the direction of the arrows a and b), and through the piston channel 60 is entered coupling piece 62 of the piston rod 44.

Piston channel 60 has a first channel 64, which is open on the cap side of the piston 16 (in the direction of arrow C), the second channel 66, which is adjacent to the first channel 64 and has a smaller diameter, and a tapered channel 68, which is adjacent to the second channel 66 and which gradually increases in diameter toward the front cover 14 (in the direction of arrow A). The first and second channels 64, 66 and tapered channel 68 are mutually interconnected.

In addition, on both end surfaces of the piston 18 has the damper grooves 70A and 70b, and the damper grooves 70A and 70b is cut to a predetermined depth. In each of the damper grooves 70A and 70b inserted elastic dampers AI 72b, respectively.

The damper grooves 70A and 70b are oriented strictly perpendicular to the axis of the piston 18 along both end surfaces, passing between a pair of sections with a flat surface 50. In addition, the damper grooves 70A and 70b provide the first grooves 74 that are adjacent to both end surfaces of the piston 18, and the second grooves 76, which is slightly more recessed inward from the both end surfaces than the first grooves 74, and the width is which increases the width of the first grooves 74. The second grooves 76 increase in width at a pre-specified amount in the direction perpendicular to the direction of extension of the damper grooves 70A, 70b.

Elastic dampers 72A, 72b are flat elements of rectangular cross section made of elastic material such as urethane rubber or its analogues, and are arranged so that they compete for a certain length outward from both end surfaces of the piston 18. Elastic dampers 72A, 72b contain channels 78 that pass along the axial direction of the damper, the basic elements 80, respectively inserted in the damper grooves 70A, 70b, and guide members 82, which have a width greater than the basic elements 80 and respectively inserted into the second grooves 76 of the damper grooves 70A, 70b.

The cross-sectional shape of the elastic dampers 72A, 72b, basically, the same as the cross-sectional shape of the damper grooves 70A, 70b, causing the guide members 82 are inserted into the second grooves 76, while the basic elements 80 is inserted into the first grooves 74 and respectively protrude outwards to a predetermined length relative to both surfaces of the piston 18.

The longitudinal dimensions of the elastic dampers 72A, 72b, generally equal to the longitudinal dimensions of the damper grooves 70A, 70b. Consequently, during installation of the elastic dampers 2A, 72b in the damper grooves 70A, 70b end surface of the elastic dampers 72A, 72b do not extend beyond the section with the flat surfaces 50 of the piston 18 and the holes 78 on the dampers are located just opposite the piston channel 60 of the piston 18. In addition, the piston rod 44 is inserted through the opening 78 of the elastic damper 72b mounted in the piston 18 on one surface of the cover shaft 16 (in the direction of the arrow). The damper grooves 70A, 70b are completely closed elastic dampers 72A, 72b due to the fact that they have elastic dampers 72A, 72b.

As for the elastic dampers 72A, 72b, their relative displacement in the axial direction of the piston 18 is regulated, since the guide members 82, which are the width for the base members 80, concatenated with the second grooves 76 of the damper grooves 70A, 70b. In the rest of the elastic dampers 72A, 72b are installed so that they can move only in directions perpendicular to the axis of the piston 18 along which pass damper grooves 70A, 70b.

In addition, the elastic dampers 72A, 72b are adjacent respectively to the front cover 14 and the lid of the rod 16 until the abutment end surface of the piston 18 in the extreme positions of the piston 18 when the displacement of the piston 18 along the line of the cylinder 12. Due to this, properly attenuated and absorbed by the elastic dampers 72A, 7b blows, occur at the contact of the piston 18 with the front cover 14 and the cover of the piston 16 and thereby prevents the impact of such shocks on the piston. In the rest of the elastic dampers 72A and 72b act as buffer mechanisms, able to absorb and dampen the impact of shocks on the piston 18.

The piston rod 44 consists of a shaft of a predetermined length in the axial direction. At one end of the shaft has a radially decreasing in diameter coupling piece 62, which is connected with the piston 18. The fitting 62 is inserted in the second channel 66 and tapered channel 68 of the piston channel 60. The other end of the piston rod 44 is inserted through the channel of the rod 42 and is supported with the possibility of displacement of the sleeve 48 and stem seal 46.

The boundary area of the piston rod 44 with the connecting piece 62 is in contact with the locking part between the first channel 64 and the second channel 66, and thereby the piston rod 44 is in a fixed state relative to the piston 18. The preload of the end fitting 62, which is inserted into the tapered channel 68, toward the side of the second channel 66 (in the direction of the arrow B), the end face of the connecting portion is flexibly deformed along the tapered channel 68 and increases in diameter. As a result, the connecting part 62 is sealed to the cone-shaped channel 68 of the piston 18 is deformed the Oh end portion, connecting thereby between a piston rod 44 and the piston 18. The connecting part 62 of the piston rod 44 does not extend beyond the end surface of the piston 18 and is sealed in such a way that it forms the same, mainly the surface as the end surface of the piston 18.

As shown in Fig.7, the locking rings 28a, 28b have a U-shaped cross-section, made of metal and are installed respectively in a pair of annular grooves 26, which are formed in the channel of the cylinder 20 of the main cylinder 12. The locking rings 28a, 28b have a shape corresponding to the annular grooves 26, and contains a curved section 84 which is bent to a predetermined radius of curvature, a pair of lever sections (straight sections) 86, which are strictly straight lines at both ends of the curved section 84, and a pair of clamping sections (curved sections) 88 located at the ends of the arm sections 86, which are curved with a predetermined radius of curvature and separated from each other by a given distance. Clamping section 88 is installed opposite the curved section 84, which is located between the lever sections 86 and locking rings 28a and 28b have some power of elasticity, resulting in the two parts of the clamping sections 88 are moving away from each other in mutually opposite directions at a specified distance.

The curved section 84 has predefined radio the curvature, corresponding to both sides of the channel of the cylinder 20, with the clamping section 88 similarly have a predefined radius of curvature that matches the curvature of the side walls of the channel of the cylinder 20.

On a hook sections 86 has a convex section protruding parts) 90, which are bent toward the inner side surface toward each other. In convex sections 90, respectively, formed fixing holes 92. More precisely, the convex section 90 and the locking holes 92 are located on the lever sections 86, coinciding with the sides curved section 84. In addition, the introduction is not shown in the figures of the drawings the latch (machine tool) in a pair of fixing holes 92 and mutual displacement of the convex sections 90 with the locking holes 92 in the directions to each other can elastically deform the lever sections 86 and clamping section 88 so that they come closer to each other and almost connects to the curved section 84. The distance between the clamping sections 88 is preset such that in the locking rings 28a, 28b had no plastic deformation when the locking rings 28a, 28b are deformed in such a direction that the lever section 86 and clamping sections 88 are mutually close to each other.

More precisely, the curved section 84 and clamping section 88 of locking rings 28a, 28b Conn is of value to both side surfaces of the channel of the cylinder 20 in the annular grooves 26.

In addition, in the annular grooves 26, behind the front cover 14, are locking rings 28a, 28b, and cover the stem 16 is mounted on the channel of the cylinder 20 of the main cylinder 12. The front cover 14 and the cover of rod 16 is fixed by means available to them protrusions 38A, 38b and locking rings 28a, 28b, respectively. When the front cover 14 and the cover of rod 16 do not extend beyond the end surface of the main cylinder 12.

The hydraulic cylinder 10 that uses a retaining ring in accordance with the present invention is constructed basically as described above. Next will be described the Assembly of the cylinder 10.

First, when the elastic dampers 72A, 72b are installed on the piston 18 on the respective sides of the piston 18 are guide members 82 of the elastic dampers 72A, 72b, and end sides of the open damper grooves 70A, 70b are elastic dampers 72A, 72b. In addition, the elastic dampers 72A, 72b are shifted from sliding toward the piston 18 to enter the guide elements 82 in the second groove 76. More precisely, the elastic dampers 72A, 72b are shifted along the damper grooves 70A, 70b in the direction perpendicular to the axis of the piston 18.

Due to this elastic dampers 72A, 72b, which are part of the guide elements 82, inserted into the second grooves 76, and along with this their basic elements 80 whodats is in the first grooves 74.

Finally, the installation of the elastic dampers 72A, 72b ends when the ends of the elastic dampers 72A, 72b will come in line and aligned with the sections of the flat surface 50 of the piston 18. In this case, the channels 78 of the elastic dampers will be installed coaxially with the piston channel 60 of the piston 18, and the elastic dampers 72A, 72b will perform at a certain height in relation to both end surfaces of the piston 18 (see figure 3).

In the same way can be easily installed elastic dampers 72A, 72b sliding displacement of the elastic dampers 72A, 72b relative to the damper grooves 70A, 70b, available on both end surfaces of the piston 18, in the directions perpendicular to the axis of the piston 18. In addition, the elastic dampers 72A, 72b may not be displaced in the axial direction, since the guide members 82 coupled with the second grooves 76.

Although elastic dampers 72A, 72b can be displaced in directions perpendicular to the axis of the piston 18, when the input piston 18 in the channel of the cylinder 20 of the main cylinder 12, due to the fact that the outer peripheral surface of the piston 18 will be covered by the inner peripheral surface of the channel of the cylinder 20, the displacement of the elastic dampers 72A, 72b in the directions perpendicular to the axis of the piston 18, is also regulated.

As a result, the elastic dampers 72A, 72b in the normal state shift the AK one and read in conjunction with displacement of the piston 18, thereby providing a reliable and adequate suppression shock acting on the piston when it is offset in the end position.

Next, explanation will be given for the case when the piston 18 with a pair of installed elastic dampers 72A, 72b is inserted into the main cylinder 12, and then the front cover 14 and the cover shaft 16 are mounted on both ends of the main cylinder 12.

First, the front cover is inserted through the channel of the cylinder 20 with one end of the main cylinder 12 and is pressed inside the channel of the cylinder 20 to the piston 18 (in the direction of the arrow B) until such time as existing tabs 38 are opposite stoppers 24 of the grooves 22A, available in the channel of the cylinder 20. After the protrusions 38A will be installed in front of the stoppers 24 and will be adjusted by the offset of the front cover 14 to the second end side of the main cylinder 12, which forms the end face of the piston 18 (in the direction of the arrow B), the retaining ring 28 is inserted into the channel of the cylinder 20 and is installed in the annular groove 26 on the one end side of the main cylinder 12.

In this case, the lever section 86 and the retaining section 88 are deformed in such directions that are pressed to each other by a clamp (not shown)which are inserted into a pair of fixing holes 92. As a result, after the retaining ring 28a will be very close to Kohl is the combat groove 26, the retaining ring 28a is again deformed by unlocking the locking state of the arm sections 86 of the latch, and due to its elasticity retaining ring 28a will expand in the radial direction and will take a position inside the annular groove 26.

Accordingly, the offset of the front cover 14 to the inside of the main cylinder 12 (in the direction of the arrow C) is adjustable in axial direction of the clutch with the projections 38A of the front cover 14 within the grooves 22A of the channel of the cylinder 20. In addition, the offset of the front cover 14 from the outer side of the main cylinder 12 (in the direction of arrow A) are also regulated by the retaining ring 28a mounted inside the annular groove 26. That is, the front cover 14 will be in a fixed state on one side of the main cylinder 12 and fit in this place, not speaking out from the end of the main cylinder 12.

Further, since the cover of rod 16 is directed along the channel of the cylinder 20 several guide elements 49 that are located on its outer peripheral surface, the axis of the channel of the rod 42 in the lid of the rod 16 and the center channel of the cylinder 20 accordingly coincide with each other, with the piston rod 44, which is introduced through the channel of the cylinder 20 can be easily and securely installed in the channel of the rod 42.

Cover rod 16 is inserted through the channel of the cylinder 20 with another that is zeway side of the main cylinder 12, as the piston rod 44 is inserted through the channel of the rod 42, while the cover of rod 16 is tightened within the channel of the cylinder 20 to the piston 18 (in the direction of arrow A) until such time as the projections 38b is set opposite the stopper 24 of the groove 22b, available in the channel of the cylinder 20. In addition, after the protrusions 38b will be installed in front of the stopper 24 of the groove 22b and the offset cover stock 16 to the other end side of the main cylinder 12, which is the front side of the piston 18 (in the direction of arrow A), shall be adjusted, retaining ring 28b is inserted into the channel of the cylinder 20 and is mounted in an annular groove 26 on the other end side of the main cylinder 12. In this case, the lever section 86 and the retaining section 88 are deformed in such directions that are pressed to each other by a clamp (not shown)which are inserted into a pair of fixing holes 92 (shown in dotted lines on Fig). As a result, after the retaining ring 28b will be very close to the annular groove 26, the retaining ring 28b is deformed by unlocking the locking state of the arm sections 86 of the latch, after which it will expand in the radial direction due to its elasticity and will take a position inside the annular groove 26.

Accordingly, displacement of the cover shaft 16 inside the main cylinder 12 (in the direction of arrow A) is regulated in ax is real direction clutch with protrusions 38b cover rod 16 within the grooves 22b of the channel of the cylinder 20. In addition, the displacement of the cover shaft 16 outside line of the cylinder 12 (in the direction of the arrow) are also regulated by the retaining ring 28b installed inside the annular groove 26. That is, the cover of rod 16 will be in a fixed state with the other end of the main cylinder 12 and fit in this place, not speaking out the other end of the main cylinder 12.

Thus, when the front cover 14 and the cover of rod 16 is installed on both ends of the main cylinder 12, a pair of protrusions 38A, 38b engage respectively with the pairs of grooves 22A, 22b, available in the channel of the cylinder 20 of the main cylinder 12, and the locking rings 28a, 28b, which are inserted on the ends of the feed cylinder 20, interlock with annular grooves 26. Due to this displacement of the front cover 14 and the cover shaft 16 in the axial direction can be easily and reliably adjusted.

Next will be explained the operation and results of the hydraulic cylinder 10, which was assembled in the manner described. Such explanations will be given with reference to the condition shown in Figure 3, which taken as a starting position, when the piston 18 is displaced to the front cover 14 (in the direction of arrow A).

The working liquid is not shown in the figures of the drawings, the power source is introduced into the first fluid channel 30. In this case, the second channel 32 is in subsalsum the atmosphere condition due to switching actions not shown guide of the distributor. As a result, the working fluid is introduced into the channel of the cylinder 20 from the first hydraulic channel 30 through the supply channel 34, so that the piston 18 is pressed against the end cap rod 16 (in the direction of arrow C) of the working fluid introduced between the front cover and the piston 18. In addition, due to the abutment of the elastic damper 72b mounted on the end surface of the piston 18 opposite the end surface of the cap rod 16, the piston 18 will move to the preset adjustable length. This occurs when the contact bumps are suppressed by the elastic damper 72b, thereby preventing the impact of such shocks on the piston 18.

On the other hand, when the piston 18 moves in the opposite direction (in the direction of arrow A), the working fluid will be supplied to the second fluid channel 32, while the first fluid channel is opened to the atmosphere due to the switching action of the sending distributor (not shown). The working fluid is introduced into the chamber of the cylinder 20 from the second hydraulic channel through the supply channel 34, so that the piston 18 is pressed against the end face of the front cover 14 (in the direction of the arrow A) of the working fluid received between the cap of the rod 16 and the piston 18. In addition, when the displacement of the piston 18, the piston rod 44 and the elastic damper 72A will move together to the end face of the front cover 14, and the and by abutment of the elastic damper 72A, which provides resistance when in contact with the end surface of the front cover 14, the piston 18 will return to its original position, which was adjusted by displacement of the piston 18. Similarly, emerging at the contact bumps are suppressed by the elastic damper 72A, thereby preventing the impact of such shocks on the piston 18.

Similarly, in the implementation of the present invention the locking rings 28a, 28b have a pair of convex sections 90, located on the inner sides of the arm sections 86 and a curved section 84, which connects the pair of arm sections 86 and convex sections 90 are respectively the locking holes 92, which may be input latches (not shown). Because of this curved section 84 is deformed when the capture is not shown in the drawings the latch so that it decreases in diameter in the radial direction and, moreover, a pair of arm sections 86 and clamping sections 88 may be shifted relative to the curved section 84 in directions towards each other. As a result, biased locking rings 28a, 28b can be inserted respectively into the channel of the cylinder 20 and properly installed in each of the annular grooves 26.

In addition, locking rings 28a, 28b there is a curved section 84 having a predefined radius, and clamping section 88, which is located opposite the curved section 84 and have the same radius of curvature, between clamping and curved sections are lever section 86. Because of this, when the locking rings 28a, 28b mounted in annular grooves 26 of the channel of the cylinder 20, the curved section 84, the lever sections 86 and clamping sections 88 are installed properly along the annular grooves 26. As a result, the outer peripheral region locking rings 28a, 28b rigidly fixed across the field in the annular grooves 26, thus locking rings 28a, 28b, a large clamping force on the front cover 14 and the cover of rod 16.

Since the locking rings 28a, 28b includes annular grooves rather homogeneous depth, the locking rings 28a, 28b creates a stable clamping force on the top cover 14 and the cover of rod 16.

Instead of the above-described locking rings 28a, 28b on the annular groove can also be set, respectively, a pair of retaining rings 100A, 100b, as shown in Figures 9 - 11.

In accordance with the first modified example, each of the retaining rings 100A, 100b has a basically U-shaped cross section and includes a curved section 102 and a pair of lever sections 104, which depart from the respective ends of the curved section 102. Lever section 104 contains located opposite each convex section 106 which protrude from the inner surface of the lever section and, in convex sections 106 are formed respectively fixing hole 108.

As for the retaining rings 100A, 100b, one of the retaining rings 100A is installed in the annular groove 26 on the side surface of the main cylinder 12, while the other retaining ring 100b is installed in the annular groove 26 on the other side surface of the main cylinder 12 (see Figure 10 and 11). More precisely, the retaining rings 100A, 100b are arranged symmetrically relative to the center line of the cylinder 12, the lever section 104 are mutually against each other. In this case, the retaining rings 100A and 100b separated by a predetermined distance. As a result, even if the line of the cylinder 12 will be slightly deformed along the length of the pressure of the fluid supplied to the channel of the cylinder 20, the retaining rings 100A, 100b will be deformed in accordance with deformation of the annular grooves 26. For this reason, the front cover 14 and the cover of rod 16 will be securely locked, even when deformation of the main cylinder 12.

Next, as shown Fig - Fig, retaining rings 150A, 150b, which in accordance with the second modified example are fixing hole 154 respectively on both ends of the lever sections 152, differ from the locking rings 28a, 28b of the present embodiment of the invention, as well as from locking to the EC 100A, 100b according to the first modified example.

As shown in Fig - Fig, a pair of retaining rings 150A, 150b, which have U-shaped cross section, made of metal and may be mounted respectively within a pair of annular grooves 26, which are done in the chamber of the cylinder 20 of the main cylinder 12.

Retaining rings 150A, 150b have a shape corresponding to the shape of the annular grooves 26, and contains a curved section 156, which is curved with a predetermined radius of curvature, a pair of lever sections 152, running in a straight line from both ends of the curved section 156, and a pair of clamping sections 158 located at the ends of the lever sections 152, which are curved with a predetermined radius of curvature and separated from each other by a predetermined distance. Clamping sections 158 are located on opposite sides of the curved section 156, between these sections there is a lever section 152 and the retaining rings 150A, 150b have a certain elasticity, which ensures the separation of the pair of clamping sections 158 between them in opposite directions at a predetermined distance. The curved section 156 has the same structure as the curved section 84, forming the locking rings 28a, 28b, and therefore a detailed explanation of this feature are omitted.

Clamping section 158 contain convex section 160, which is located against each other, and a bulge on the inner lateral surfaces of the clamping sections 158. Fixing hole 154 formed respectively on each convex section 160. In addition, the introduction of a not shown lock in a pair of fixing holes 154 and offset convex sections 160 together with the locking holes 154 in the direction towards each other can elastically deform the lever section 152 and the locking section 158 so that they will converge among themselves, when connected to a curved section 156.

In addition, the retaining rings 150A, 150b are inserted respectively in the annular grooves 26 after the front cover 14 and the cover of rod 16 will be installed on the chamber of the cylinder 20 of the main cylinder 12. Accordingly, the front cover 14 and the cover of rod 16 is fixed by means available to them protrusions 38A, 38b and retaining rings 150A, 150b. Thus the top cover 14 and the cover of rod 16 do not extend beyond the end surface of the main cylinder 12.

Retaining ring for hydraulic cylinder in accordance with the present invention is not limited to the above embodiments of the invention, and can be used in a variety of other configurations, but without deviating from the essential features and essence of the present invention.

1. Retaining ring for hydraulic cylinder (10)located in the said cylinder (10), in which the piston (18), to ascertain the tion in the case of the cylinder (12), having the chamber of the cylinder (20) with elliptical cross-sectional shape, is offset by the working fluid, while the aforementioned retaining ring secures the cover (14, 16)that are installed on the ends of the said cylinder barrel (12), and said retaining ring (28a, 28b, 100A, 100b) includes: a curved section (84, 102)that is installed on the surface of the inner wall of the said chamber of the cylinder (20) and is curved along the surface of the inner wall of the said chamber of the cylinder (20); a pair of straight sections (86, 104)extending from both all mentioned curved section (84, 102) and parallel to each other; and a pair of convex sections (90, 106)located on said straight sections (86, 104) and having openings (92, 108), which can be inserted into the machine tool, these curved section (84, 102) and said straight sections (86, 104) are deformed and disposed away from said surface of the inner wall of the machine tool, which is inserted into the said holes (92, 108).

2. Retaining ring for hydraulic cylinder (10) according to claim 1, in which the aforementioned convex section (90) are arranged on mutually opposite directions on said pair of straight sections (86, 104).

3. Retaining ring for hydraulic cylinder (10) according to claim 2, comprising a pair of arcuate sections (88)on the ends of the mentioned straight sections (86) and mentioned arcuate section (88) have the same radius of curvature, as mentioned curved section (84), and said arcuate section (88) are located against each other, while between curved and arcuate sections are straight section (86).

4. Retaining ring for hydraulic cylinder (10) according to claim 1, in which the mentioned retaining ring (100A, 100b) consists of a pair of retaining rings (100A, 100b), installed symmetrically with respect to the Central axis of the said cylinder barrel (12).

5. Retaining ring for hydraulic cylinder (10) according to claim 1, in which the mentioned retaining ring (28a, 28b, 100A, 100b) is inserted into the installation groove (26)formed in the above-mentioned chamber of the cylinder (20), for locking the said cover (14, 16).

6. Retaining ring for hydraulic cylinder (10) according to claim 1, in which the aforementioned convex section (90) is located on the border between the said curved section (84) and said straight sections (86).

7. Retaining ring for hydraulic cylinder (10) according to claim 1, in which the aforementioned convex section (106) are located near the ends of the mentioned straight sections (104).



 

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