Bead cage overrunning clutch

Abstract

The present invention proposes a bead rack type overrunning clutch, comprising a body and a roller, wherein the body is annular, and a roller profile groove is arranged on the inner peripheral wall of the body, and a roller is placed in the roller profile groove, and two adjacent rollers are separated by a spring, and the spring is installed on a bead rack that is embedded with the body, and the bead rack comprises a first side cover and a second side cover in the shape of an annular sheet, and the first side cover and the second side cover are provided with opposite spring mounting columns, and each of the springs is installed on a pair of opposite spring mounting columns, and the first side cover and the second side cover are also provided with claws and are inserted into the body through the claws to be clamped and fixed with the body. The inner peripheral wall of the body of the present invention can accommodate more rollers and can ensure the effective working stroke of the rollers, the clutch has a high load-bearing capacity, a long service life, and a high overall appearance of the clutch.

Description

Technical Field

[0001] The invention relates to a clutch, in particular to a bead rack type overrunning clutch. Background Art

[0002] The overrunning clutch is an important component for realizing power transmission and separation between the driving shaft and the driven shaft. It is a device with a self-clutching function by utilizing the speed change or rotation direction change of the driving and driven parts. The existing overrunning clutch includes a connected cover and a body, the end face of the cover is located on one side of the body, the body is annular, and the inner peripheral wall of the body is provided with grooves for placing rollers and compression springs, and there are multiple grooves and they are evenly distributed. Since the bottom wall, front wall and rear wall of the existing groove are processed on the body, its shape is relatively complex, so the broaching tool structure for broaching the groove on the body is also relatively complex, the broaching processing allowance is large, the processing efficiency is low and the broaching tool cost is high, and because of the front wall and rear wall of the groove, the body consumes more materials, all of which make the production cost of the existing overrunning clutch high. Moreover, due to the limited inner peripheral space of the body, the axis of the compression spring is long, and the axis of the compression spring is perpendicular to the roller. If the clutch load capacity is to be increased by increasing the number of rollers, the number of rollers will be limited.

[0003] In order to solve this problem, Chinese patent document CN108561455A discloses a torsion spring type overrunning clutch, comprising a body, a housing, a roller and a baffle, wherein the housing and the baffle are respectively installed on both sides of the body, the body is annular, a roller groove is arranged on the inner peripheral wall of the body, a roller is placed in the roller groove, a torsion spring parallel to the roller is arranged between two adjacent rollers, the torsion spring is supported on a mounting column arranged on the housing, the front end of the mounting column is inserted into a supporting hole arranged on the baffle, and the torsion arm of the torsion spring is against the rear end of the previous roller. This torsion spring is supported on the housing, and the rear wall of the supporting spring does not need to be processed on the body, and the process of processing a deep groove on the body is omitted. Only a shallow roller groove needs to be processed, and the cutting allowance of the processing tool is small, the processing efficiency is high, the tool life is long, and the production cost of the product can be reduced. More importantly, when the inner circumferential diameter of the body is limited, the number of rollers can be increased, thereby increasing the clutch load capacity as much as possible without increasing the outer dimensions of the body. However, in this clutch, since the spring is supported on a thin and long spring mounting column that is integrally bent and formed with the cover, when the load of the clutch is further increased, the spring will be deflected due to the lack of stability of the mounting column, so that the roller cannot move according to the predetermined trajectory, the roller cannot fully reach the designed stroke, the roller working stroke is reduced, and the clutch load capacity is reduced. In addition, the two sides of the body are respectively a cover and a baffle with a diameter substantially the same as the outer circumference of the body, the cover includes an end plate and a circumference, and the circumference of the cover is to be covered and embedded in the outer circumference of the body, and the cover and the baffle basically cover the two sides of the body, which is not conducive to the heat dissipation of the body and the lubrication of the roller, affecting the service life of the clutch, and the cover and the baffle use a lot of materials, and the cost is not easy to reduce. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a bead cage type overrunning clutch, which can accommodate more rollers and ensure the effective working stroke of the rollers. The clutch has a high load-bearing capacity and a long service life.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a bead rack type overrunning clutch, comprising a body and a roller, the body is annular, and a roller profile groove is arranged on the inner peripheral wall of the body, and a roller is placed in the roller profile groove, and two adjacent rollers are separated by a spring, and the spring is installed on a bead rack embedded with the body, and the spring applies a spring force to the roller so that each roller is stuck between two springs when not in working state; the bead rack comprises a first side cover and a second side cover in the shape of an annular sheet, and the first side cover and the second side cover are provided with opposite spring mounting posts, and the spring mounting posts are parallel to the axis of the roller, and each of the springs is installed on a pair of opposite spring mounting posts, and the first side cover and the second side cover are also provided with claws, and the claws are inserted into the body to be fixed with the body.

[0006] Each spring fitted with the roller of the present invention is supported by a pair of spring mounting columns arranged on the bead frame, and the pair of spring mounting columns are composed of spring mounting columns opposite to each other on the first side cover and the second side cover, and the length of each spring mounting column is no more than half of the length of the spring mounting hole, thereby changing the state of the spring mounting column being long and thin. The spring mounting column has high strength and rigidity, is not easy to deform, and has strong stability. Even if the load of the clutch is increased, the installation axis of the spring, i.e., the spring mounting column, can maintain its original state, and there will be no problem that the roller cannot move according to the predetermined trajectory due to the deflection of the spring mounting column and the spring, the roller cannot fully reach the designed stroke, the working stroke of the roller is reduced, and the clutch load capacity is reduced. The first side cover and the second side cover constituting the bead rack are fixed to the main body by means of claws. The outer diameters of the first side cover and the second side cover only need to be slightly larger than the diameters of the spring mounting columns to ensure the strength of the two side covers and the mounting positions of the claws and the main body. The outer diameters of the first side cover and the second side cover are reduced, and there is no need to shield the two sides of the main body, which is beneficial to the heat dissipation of the main body and the lubrication of the rollers, thereby increasing the service life of the clutch and improving the integrity of the product appearance. In addition, the cover and baffle with more original materials are removed, which can reduce materials and reduce production costs.

[0007] Furthermore, in order to optimize the structure, reasonably configure the space, and improve the heat dissipation and lubrication effects of the clutch, the spring mounting column is arranged on the inner periphery of the first side cover and the second side cover, and the claw is arranged on the outer periphery of the first side cover and the second side cover, and the spring mounting column and the claw are integrally bent and formed by the first side cover and the second side cover.

[0008] Furthermore, the claws on the first side cover and / or the second side cover pass through the slots or holes provided on the body and then bend and press against the side surface of the body. The claws passing through the body and then bending and pressing against the body make the side cover and the body more firmly fixed, ensuring that the position of the spring mounting column does not move, and the work is more reliable.

[0009] Furthermore, a claw groove adapted to the claw is provided on the inner peripheral wall of the body, and a long claw is provided on the first side cover, which passes through the claw groove and then is bent and pressed against the side of the body; a short claw is provided on the second side cover, which is clamped in the claw groove, and the long claw and the short claw are clamped on the body in an interlaced manner. The body adopts a claw groove, and the two ends and the top of the claw groove are open, which is easy to assemble the claw. The long claw is provided on one of the two side covers, which may also reduce the difficulty of assembly and facilitate assembly.

[0010] Furthermore, one side of the body is provided with a concave two-step stepped annular surface, and the inner side of the first step annular surface is a second step annular surface for installing the second side cover; the first side cover is installed in a step hole provided on the other side of the body, and the outer edge of the body on this side is connected to the outer circumference of the body through a cone surface. The first side cover and the second side cover are both installed in the step hole, and the two side covers do not emerge from the side of the body, and the appearance of the product is highly integrated; the second side cover provided with a short claw is located on the side where the adjacent shaft parts (such as the motor sleeve) are installed, and the adjacent shaft parts are located in the first step annular surface. Since the second side cover and the adjacent shaft parts are against each other, the axial force of the second side cover is small, and the second side cover can be provided with a short claw to limit its circumferential rotation, thereby reducing the difficulty of assembly; the first side cover is located on the outside of the clutch and is provided with a long claw with a curved hook to ensure the circumferential and axial positioning of the first side cover, and the outer edge of the body on the outside is connected to the outer circumference through a cone surface. This large chamfer can avoid other adjacent parts and improve the compactness of the whole machine assembly.

[0011] Furthermore, in order to improve the bearing capacity of the spring and install it reliably, as an implementation method, the spring is a steel wire torsion spring, which includes a U-shaped torsion arm in the middle and spring coils on both sides, and the spring coils include a power storage coil close to the torsion arm and a square hole seat ring at both ends of the torsion spring, the outer diameter of the power storage coil is larger than the outer diameter of the square hole seat ring, the cross section of the spring mounting column is rectangular, the spring mounting column is adapted to the square hole seat ring, and the torsion arm extends from the oblique upper side of the spring mounting column and abuts against the roller. The power storage coil is relatively large, which can make the torsion spring store torque, and the square hole seat ring cooperates with the spring mounting column, so that the torsion spring cannot rotate relative to the spring mounting column, the torsion arm can store power to work, and the torsion spring can be installed and work more reliably.

[0012] Furthermore, as another embodiment, the spring is a steel leaf torsion spring, the innermost circle of the steel leaf torsion spring is a square hole seat ring, the cross-section of the spring mounting column is a rectangle, the spring mounting column is adapted to the square hole seat ring, and the outer end of the steel leaf torsion spring extends from the oblique upper part of the spring mounting column and abuts against the roller.

[0013] Furthermore, a space is left between the spring mounting posts on the first side cover and the second side cover, so that the spring can be assembled after the two side covers are assembled, and the length of the spring mounting post is shortened, and the strength and rigidity are better.

[0014] Furthermore, the width of the root portion of the spring mounting column is greater than the width of the front end portion.

[0015] Furthermore, in order to make the dynamic balance of the clutch better, the operation more reliable, and have excellent load-bearing capacity, the number of the rollers is 12.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Under the condition of limited inner hole diameter, more rollers can be accommodated. The spring mounting column has high strength and rigidity, is not easy to deform, has strong stability, can ensure the effective working stroke of the roller, and the clutch has high load-bearing capacity and long service life.

[0018] 2. The cover and baffle of the traditional overrunning clutch are removed, which can reduce the material consumption and production cost, and the appearance of the clutch is more integrated and more beautiful;

[0019] 3. The diameter of the bead holder is small and does not block the body, so the clutch has good heat dissipation and lubrication effects, and the service life of the clutch is increased;

[0020] 4. Only a shallow roller profile groove needs to be machined on the inner hole of the main body, without machining the wall for supporting the compression spring, which reduces the material of the main body, saves raw materials, and reduces the cost of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0022] Figure 2 for Figure 1 A local enlarged view of the left view.

[0023] Figure 3 This is a schematic diagram of the installation relationship between the main body, the first side cover and the second side cover in Example 1.

[0024] Figure 4 for Figure 3 Main view of the body.

[0025] Figure 5 for Figure 3 Front view of the first side cover.

[0026] Figure 6 for Figure 3 Front view of the second side cover.

[0027] Figure 7 for Figure 1 One of the structural diagrams of the middle spring.

[0028] Figure 8 for Figure 1 The second schematic diagram of the structure of the middle spring.

[0029] Fig. 9 This is a schematic diagram of the structure of the spring in Example 2 of the present invention.

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0031] Example 1: Figures 1 to 4 As shown, a bead rack type overrunning clutch comprises a body 1 and rollers 2. The body 1 is annular, and a roller profile groove 11 is provided on the inner peripheral wall of the body 1. The rollers 2 are placed in the roller profile groove 11. In this embodiment, there are 12 rollers 2, so that the clutch has excellent load-bearing capacity and better dynamic balance. Two adjacent rollers 2 are separated by springs 3, and the springs 3 are installed on the bead rack 4 embedded with the body 1. The springs 3 apply spring force to the rollers 2 so that each roller 2 is stuck between two springs 3 when not in operation. The bead holder 4 includes a first side cover 41 and a second side cover 42 in the shape of an annular sheet. The first side cover 41 and the second side cover 42 are provided with opposite spring mounting posts 31. The spring mounting posts 31 are provided on the inner periphery of the first side cover 41 and the second side cover 42. The spring mounting posts 31 are parallel to the axis of the roller 2. The root width of the spring mounting posts 31 is greater than the width of the front end, so that the root strength is high and the spring 3 is easy to be inserted. There is a gap between the opposite spring mounting posts 31. Each spring 3 is inserted on a pair of opposite spring mounting posts 31. Each spring 3 that fits the roller 2 is supported by a pair of spring mounting posts 31 provided on the bead holder 4. The pair of spring mounting posts 31 is composed of the opposite spring mounting posts 31 on the first side cover 41 and the second side cover 42. The gap between the spring mounting posts 31 allows the spring 3 to enter the gap for assembly, so that the spring 3 can be assembled after the two side covers are assembled. In addition, the length of the spring mounting posts 31 is shortened, and the strength and rigidity are better.

[0032] like Figures 1 to 3 , Figure 5 and Figure 6 As shown, claws are evenly arranged on the first side cover 41 and the second side cover 42 in the circumferential direction, and are inserted into the body 1 to be clamped and fixed with the body 1. The position of the claws in the circumferential direction corresponds to the spring mounting column 31. In this embodiment, a claw groove 12 adapted to the claw is provided on the inner circumferential wall of the body 1, which is easy to assemble with the claw. The number of the claw grooves 12 is the same as the number of the rollers 2, both of which are 12. The claws are arranged on the outer circumference of the first side cover 41 and the second side cover 42. The spring mounting column 31 and the claws are integrally bent and formed by the first side cover 41 and the second side cover 42. Arc grooves are provided on both sides of the roots of the spring mounting column 31 and the claws, which can reduce the stress concentration at the root caused by the bending of the spring mounting column 31 and the claws, and the lubricating oil can also enter the working part inside the clutch through this arc groove.

[0033] like Figures 3 to 6As shown, one side of the body 1 is provided with a concave two-step stepped annular surface, and the first-step stepped annular surface 13 is used to install parts on adjacent shafts, such as motor shaft sleeves. On the inner side of the first-step stepped annular surface 13 is a second-step stepped annular surface 14 for installing the second side cover 42. Since the second side cover 42 is abutted against the motor shaft sleeve of the adjacent shaft part, the axial force of the second side cover 42 is small, and the second side cover 42 is provided with a short claw 421 to limit its circumferential rotation. The second side cover 42 is provided with a short claw 421, and the short claw 421 is clamped in the claw groove 12. The first side cover 41 is provided with a long claw 411, which passes through the claw groove 12 and then is bent and pressed against the side surface of the main body 1. The second side cover 42 is provided with a notch for giving way to the long claw 411, which passes through the claw groove 12 provided on the main body 1 and then is bent and pressed against the side surface of the main body 1, thereby ensuring the circumferential and axial positioning of the first side cover 41, making it more firmly fixed to the main body 1, ensuring that the position of the spring mounting column 31 does not move, and working more reliably. The long claws 411 and the short claws 421 on the two side covers are staggered and intermittently engaged in the claw grooves 12 of the body 1. The first side cover 41 is installed in the step hole 15 provided on the other side of the body 1. The outer edge of the body 1 on this side is connected to the outer circumference of the body 1 through a conical surface 16. In this embodiment, the length of the conical surface 16 is 5-7mm. This large chamfer can allow a part of the conical surface side of the body 1 to extend into the countersunk hole of the magnetic motor flange, reduce the length of the motor shaft, and improve the compactness of the whole machine assembly. The first side cover 41 and the second side cover 42 are both installed in the step hole, and the two side covers do not protrude from the side of the body 1, and the product has a high overall appearance.

[0034] like Figure 7 and Figure 8 As shown, in this embodiment, the spring 3 is a steel wire torsion spring, which includes a U-shaped torsion arm in the middle and spring coils on both sides, and the spring coils include a power storage coil 32 close to the torsion arm 34 and a square hole seat ring 33 at both ends of the torsion spring. The outer diameter of the power storage coil 32 is larger than the outer diameter of the square hole seat ring 33. The cross section of the spring mounting column 31 is rectangular, and the spring mounting column 31 is adapted to the square hole seat ring 33. The torsion arm 34 extends from the oblique upper side of the spring mounting column 31 and abuts against the roller 2. The power storage coil 32 is relatively large, which can make the torsion spring store torque. The square hole seat ring 33 cooperates with the spring mounting column 31, so that the torsion spring cannot rotate relative to the spring mounting column 31, and the torsion arm 34 can store power to work, so that the torsion spring can be installed and work more reliably.

[0035] Embodiment 2: The structures of the components and the relationships between the components in this embodiment are basically the same as those in Embodiment 1, except that the spring 3 is a steel leaf torsion spring (such as Fig. 9As shown), the innermost circle of the steel leaf torsion spring is also a square hole seat ring, which is adapted to the spring mounting column 31. Similar to Example 1, the outer end of the steel leaf torsion spring extends from the oblique upper side of the spring mounting column 31 and abuts against the roller 2.

[0036] The clutch provided by the present invention can maintain the original state of the installation axis of the spring 3, i.e., the spring installation column 31, even if the load is increased, and the roller 2 cannot move according to the predetermined trajectory due to the deflection of the spring installation column 31 and the spring 3, and the roller 2 cannot fully reach the design stroke, the working stroke of the roller 2 is reduced, and the clutch load capacity is reduced. In addition, the first side cover 41 and the second side cover 42 constituting the bead frame 4 are fixed to the body 1 by the claws. The outer diameters of the first side cover 41 and the second side cover 42 are only slightly larger than the diameters distributed by the spring installation columns 31, so as to ensure the strength of the two side covers and the installation positions of the claws and the body 1. The outer diameters of the first side cover 41 and the second side cover 42 are reduced, and the two sides of the body 1 do not need to be shielded, which is beneficial to the heat dissipation of the body 1 and the lubrication of the roller 2, and the service life of the clutch is increased. The integrity of the product appearance is also improved, and the cover and baffle with more original materials are removed, which can reduce the materials and reduce the production cost.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A bead cage type overrunning clutch, comprising a body and a roller, wherein the body is annular, a roller profile groove is arranged on the inner peripheral wall of the body, and a roller is placed in the roller profile groove, characterized in that: The two adjacent rollers are separated by a spring, and the spring is installed on a bead rack embedded with the main body. The spring applies a spring force to the roller so that each roller is stuck between the two springs when it is not working; the bead rack includes a first side cover and a second side cover in the shape of an annular sheet, and the first side cover and the second side cover are provided with opposing spring mounting columns, and a spacing is left between the opposing spring mounting columns, and the spring mounting columns are parallel to the axis of the roller, and each of the springs is installed on a pair of opposing spring mounting columns, and the first side cover and the second side cover are also provided with claws and are inserted into the main body through the claws to be fixed with the main body; the spring mounting columns are arranged on the inner circumference of the first side cover and the second side cover, and the claws are arranged on the outer circumference of the first side cover and the second side cover, and the inner circumferential wall of the main body is provided with claw grooves adapted to the claws.

2. The bead cage type overrunning clutch according to claim 1, characterized in that: The spring mounting column and the claw are formed by bending the first side cover and the second side cover in one piece.

3. The bead cage type overrunning clutch according to claim 1, characterized in that: The claws on the first side cover and / or the second side cover pass through the slots or holes provided on the main body and then are bent and pressed against the side surface of the main body.

4. The bead cage type overrunning clutch according to claim 2, characterized in that: The first side cover is provided with a long claw, which passes through the claw groove and then is bent and pressed against the side surface of the main body; the second side cover is provided with a short claw, which is clamped in the claw groove, and the long claw and the short claw are clamped on the main body in an alternating manner.

5. The bead cage type overrunning clutch according to claim 4, characterized in that: A side surface of the main body is provided with a concave two-step stepped annular surface, and the inner side of the first-step stepped annular surface is a second-step stepped annular surface for installing the second side cover; the first side cover is installed in a step hole provided on the other side surface of the main body, and the outer edge of the main body on this side is connected to the outer circumference of the main body through a conical surface.

6. The bead cage type overrunning clutch according to claim 1, characterized in that: The spring is a steel wire torsion spring, which includes a U-shaped torsion arm in the middle and spring coils on both sides. The spring coils include a force storage coil close to the torsion arm and square hole seat rings at both ends of the torsion spring. The outer diameter of the force storage coil is larger than the outer diameter of the square hole seat ring. The cross-section of the spring mounting column is rectangular. The spring mounting column is adapted to the square hole seat ring. The torsion arm extends from the oblique upper part of the spring mounting column and abuts against the roller.

7. The bead cage type overrunning clutch according to claim 1, characterized in that: The spring is a steel leaf torsion spring, the innermost circle of which is a square hole seat ring, the cross-section of the spring mounting column is a rectangle, the spring mounting column is adapted to the square hole seat ring, and the outer end of the steel leaf torsion spring extends from the oblique upper part of the spring mounting column and abuts against the roller.

8. The bead cage type overrunning clutch according to claim 1, characterized in that: The width of the root portion of the spring mounting column is greater than the width of the front end portion.

9. The bead cage type overrunning clutch according to claim 1, characterized in that: There are 12 rollers.

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