Cam roller type one-way clutch

Abstract

The present application relates to a kind of cam roller type one-way clutch.The present application includes gear, including the first gear outer circle and the second gear outer circle connected, the first outer circle is provided with involute tooth profile;Sleeve, sleeve is set to the second gear outer circle and with the gear axial end face, the inner hole of the sleeve is distributed with multiple cavities along the circumference, the spring is arranged in the cavity, and the roller is contacted with the second gear outer circle by the spring;Cover, cover is set between the gear and the sleeve, to seal the cavity;Cam disc, sleeve is set to the sleeve, the cam disc includes two central symmetrical and protruding towers set on its outer circle, the axial end face between the cam disc and the sleeve is provided with wear-resistant ring, the inner hole of the cam disc and the sleeve is provided with wear-resistant bushing.The present application reduces the noise and resistance when clutch rotates, so that gear top tooth is not easy to damage, improves the life of starter.

Description

TECHNICAL FIELD

[0001] The present application relates to the clutch technical field, especially point to a kind of cam roller type one-way clutch, for the one-way transmission power reverse skid roller type one-way clutch of automobile starter. BACKGROUND

[0002] After decades of development, the technology level of internal combustion engine industry has made great progress. Figure 3 As shown in the prior art one-way clutch structure is connected with starter yoke by iron bushing, when rotating and moving, the friction resistance between starter yoke and iron bushing, iron bushing and sleeve is large, and the gear top teeth are easy to be damaged. Therefore, in order to keep up with the development of internal combustion engine industry and supporting needs, it is necessary to solve the above problems to improve the service life of starter. SUMMARY

[0003] In order to solve the problem of large noise and large resistance when rotating and moving of the existing one-way clutch, which causes the damage of gear top teeth, the present application provides a cam roller type one-way clutch, which replaces the iron bushing with cam, and sets wear-resistant ring and wear-resistant bushing, so that the performance and service life of the starter are significantly improved.

[0004] In order to solve the above technical problems, the present application provides a cam roller type one-way clutch, which comprises:

[0005] Gear, comprising a first gear outer circle and a second gear outer circle connected, the first outer circle is provided with involute tooth profile;

[0006] Sleeve, sleeved on the second gear outer circle and abutting against the axial end face of the gear, the inner hole of the sleeve is distributed with a plurality of cavities in the circumferential direction, the cavity is provided with a spring and a roller in contact with the second gear outer circle through the spring;

[0007] Cover, covering between the gear and the sleeve to close the cavity;

[0008] Cam disc, sleeved on the sleeve, the cam disc comprises two central symmetrical and protruding towers provided on the outer circle thereof, the axial end face of the cam disc is provided with a wear-resistant ring between the sleeve, and the inner hole of the cam disc is provided with a wear-resistant bushing between the sleeve.

[0009] In an embodiment of the present application, a groove is formed between the first gear outer circle and the second gear outer circle, the cover comprises a side wall and a cover wall extending from the side wall, the opening of the side wall is located in the groove, the side wall of the cover is provided with an insert piece in contact with the roller between the axial end face of the sleeve, the insert piece is in abutment with the groove through the cover, and the insert piece is spliced by two semicircular rings.

[0010] In one embodiment of the present application, the sleeve comprises a first sleeve outer circle, a second sleeve outer circle and a third sleeve outer circle connected in sequence, a slope is formed between the first sleeve outer circle and the second sleeve outer circle, and the cover wall is riveted to the slope.

[0011] In one embodiment of the present application, a sleeve step is formed between the second sleeve outer circle and the third sleeve outer circle, the cam disc axially extends an annular boss, the wear-resistant ring is in abutment with the annular boss and faces a first step surface of the sleeve step, and the wear-resistant bushing is embedded in the cam disc inner hole and sleeved on a second step surface of the sleeve step.

[0012] In one embodiment of the present application, the wear-resistant ring is in the annular structure, is formed by pressure casting of non-metallic material, and is provided with a circular-arc annular groove on one side facing the first step surface of the sleeve step and in abutment with the second step surface of the sleeve step.

[0013] In one embodiment of the present application, the second step surface of the sleeve step is provided with a shaft retaining ring for fixing the cam.

[0014] In one embodiment of the present application, the chamber comprises an L-shaped spring chamber and an eccentric circular arc surface connected with each other, the roller is arranged in the eccentric circular arc surface, and the spring is arranged in the L-shaped spring chamber and in abutment with the roller and the L-shaped spring chamber side wall respectively, so that the side surface of the roller is in line contact with the eccentric circular arc surface and the second gear outer circle respectively.

[0015] In one embodiment of the present application, five chambers are uniformly arranged circumferentially.

[0016] In one embodiment of the present application, the cam disc is made of nylon.

[0017] In one embodiment of the present application, the tower is in the cylindrical structure.

[0018] The above technical scheme of the present application has the following advantages compared with the prior art:

[0019] The one-way clutch of the present application integrates the cam and the wear-resistant ring into one, forms a moving connection structure, replaces the iron bushing with the cam, and is provided with the wear-resistant ring and the wear-resistant bushing, so that the friction coefficient is small, the noise and resistance during rotation are reduced, the gear top teeth are not easily damaged, and the service life of the starter is improved.

[0020] The cam outer circle of the one-way clutch has two centrally symmetrical cylindrical towers, the starter yoke is free to rotate around the shaft centers of the two towers when the one-way clutch moves forward, the eccentric friction is prevented, and the forward movement resistance is reduced.

[0021] The wear-resistant ring of the one-way clutch is made of non-metallic material. When the one-way clutch gear moves forward and the engine gear ring gear is in top gear, the wear-resistant ring deforms to produce damping and shock prevention effect, thereby preventing the one-way clutch gear from being damaged by top gear. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings.

[0023] Figure 1 is a structural schematic diagram of the cam roller type one-way clutch of the present application.

[0024] Figure 2 is a side view of Figure 1 .

[0025] Figure 3 is a structural schematic diagram of the existing one-way clutch.

[0026] DESCRIPTION OF DRAWINGS

[0027] 1, gear; 11, first gear outer circle; 12, second gear outer circle; 13, involute tooth profile; 14, groove;

[0028] 2, sleeve; 21, cavity; 211, L-shaped spring chamber; 212, eccentric circular arc surface; 22, spring; 23, roller; 24, first sleeve outer circle; 25, second sleeve outer circle; 26, third sleeve outer circle; 27, inclined surface; 28, sleeve step;

[0029] 3, cover; 31, side wall; 32, cover wall;

[0030] 4, cam disc; 41, tower; 42, wear-resistant ring; 421, circular arc annular groove; 43, annular boss;

[0031] 5, wear-resistant shaft bushing;

[0032] 6, insert piece;

[0033] 7, shaft check ring. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it. The embodiments are not limiting to the present application.

[0035] In the present application, if there is a description of direction (up, down, left, right, front and back), it is only for the convenience of describing the technical solutions of the present application, and is not intended to indicate or imply that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0036] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "more than" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the present application, if there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0037] In the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected, or can be electrically connected or capable of communicating with each other; can be the communication or interaction relationship between two elements or the interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solutions.

[0038] Referring to Figures 1 to 2 The cam roller type one-way clutch of the present application comprises:

[0039] The gear 1 comprises a first gear outer circle 11 and a second gear outer circle 12 connected to each other, and the first outer circle is provided with an involute tooth profile 13;

[0040] The sleeve 2 is sleeved on the second gear outer circle 12 and abuts against the axial end face of the gear 1, and the inner hole of the sleeve 2 is circumferentially distributed with a plurality of cavities 21, and the cavities 21 are provided with springs 22 and rollers 23 in contact with the second gear outer circle 12 through the springs 22;

[0041] The cover 3 is covered between the gear 1 and the sleeve 2 to close the cavities 21;

[0042] The cam disc 4 is sleeved on the sleeve 2, the cam disc 4 comprises two central symmetrical and protruding towers 41 provided on the outer circle thereof, a wear-resistant ring 42 is provided between the axial end face of the cam disc 4 and the sleeve 2, and a wear-resistant bushing 5 is provided between the inner hole of the cam disc 4 and the sleeve 2.

[0043] In some embodiments, the tower 41 is in a cylindrical structure.

[0044] In some embodiments, a groove 14 is formed between the first gear outer circle 11 and the second gear outer circle 12, the cover 3 is in a barrel structure, the cover 3 includes a side wall 31 and a cover wall 32 extending from the side wall 31, the opening of the side wall 31 is located in the groove 14, a plug 6 in contact with the roller 23 is arranged between the inner surface of the side wall 31 of the cover 3 and the axial end surface of the sleeve 2, the plug 6 is in abutment with the groove 14 through the cover 3, and the plug 6 is spliced by two semicircular rings.

[0045] In some embodiments, the sleeve 2 includes a first sleeve outer circle 24, a second sleeve outer circle 25 and a third sleeve outer circle 26 connected in sequence, an inclined surface 27 is formed between the first sleeve outer circle 24 and the second sleeve outer circle 25, and the cover wall 32 is riveted to the inclined surface 27.

[0046] In some embodiments, a sleeve step 28 is formed between the second sleeve outer circle 25 and the third sleeve outer circle 26, the cam disc 4 axially extends an annular boss 43, the wear-resistant ring 42 is in abutment with the annular boss 43 and faces a first step surface of the sleeve step 28, and the wear-resistant bushing 5 is embedded in the inner hole of the cam disc 4 and is sleeved on a second step surface of the sleeve step 28.

[0047] By integrating the cam disc 4 and the wear-resistant ring 42, a moving connection structure is formed, the original structure is connected with the starter yoke by an iron bushing, and the frictional resistance between the starter yoke and the iron bushing and between the iron bushing and the sleeve is large, which is easy to wear and jam. The new structure uses a cam to replace the iron bushing and is provided with the wear-resistant ring 42 and the wear-resistant bushing 5, so that the frictional resistance is reduced.

[0048] In some embodiments, the wear-resistant ring is in an annular structure, is formed by pressure casting of a non-metallic material, has a circular-arc annular groove 421 on one side facing the first step surface of the sleeve step 28, and is in abutment with the second step surface of the sleeve step 28.

[0049] In some embodiments, the second step surface of the sleeve step 28 is provided with a shaft retainer 7 for fixing the cam.

[0050] In some embodiments, the chamber 21 includes an L-shaped spring chamber 211 and an eccentric circular arc surface 212 connected with each other, the roller 23 is arranged in the eccentric circular arc surface 212, the spring 22 is arranged in the L-shaped spring chamber 211 and is in abutment with the roller 23 and the side wall 31 of the L-shaped spring chamber 211 respectively, so that the side surface of the roller 23 is in line contact with the eccentric circular arc surface 212 and the second gear outer circle 12 respectively.

[0051] In some embodiments, the inner hole of the sleeve 2 has an involute tooth shape 13 spline at the other end matched with the motor shaft, and the inner hole of the gear 1 has two connected smooth cylindrical holes of different sizes.

[0052] In some embodiments, the chamber 21 is circumferentially uniformly provided with five, the spring 22 is a flat spiral spring 22; the cam disc 4 is made of nylon.

[0053] By setting two central symmetric protruding towers 41 on the outer circle of the cam disc 4, when the one-way clutch moves forward, the starter yoke can freely rotate around the axis of the two towers 41 after being buckled, preventing eccentric friction and reducing the forward resistance; when the one-way clutch gear 1 moves forward and the engine gear ring gear 1 occurs, the wear-resistant ring 42 is deformed to produce damping and shock prevention, thereby preventing the one-way clutch gear 1 from being damaged by the top tooth.

[0054] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A cam-roller type one-way clutch, characterized in that, include: The gear (1) includes a first gear outer circle (11) and a second gear outer circle (12) connected together, wherein the first gear outer circle is provided with an involute tooth profile (13). A sleeve (2) is fitted onto the outer circle (12) of the second gear and abuts against the axial end face of the gear (1). The inner hole of the sleeve (2) has multiple chambers (21) distributed circumferentially. A spring (22) and a roller (23) that contacts the outer circle (12) of the second gear through the spring (22) are provided in the chamber (21). A cover (3) is placed between the gear (1) and the sleeve (2) to seal the chamber (21). A cam disk (4) is fitted onto the sleeve (2). The cam disk (4) includes two centrally symmetrical and protruding towers (41) on its outer circle. A wear-resistant ring (42) is provided between the axial end face of the cam disk (4) and the sleeve (2). A wear-resistant bushing (5) is provided between the inner hole of the cam disk (4) and the sleeve (2). A groove (14) is formed between the outer circle (11) of the first gear and the outer circle (12) of the second gear. The cover (3) includes a side wall (31) and a cover wall (32) extending from the side wall (31). The opening of the side wall (31) is located in the groove (14). An insert (6) that contacts the roller (23) is provided between the inner surface of the side wall (31) of the cover (3) and the axial end face of the sleeve (2). The insert (6) abuts against the groove (14) through the cover (3). The insert (6) is formed by splicing two semi-circular rings. The sleeve (2) includes a first sleeve outer circle (24), a second sleeve outer circle (25) and a third sleeve outer circle (26) connected in sequence. An inclined surface (27) is formed between the first sleeve outer circle (24) and the second sleeve outer circle (25). The cover wall (32) is riveted to the inclined surface (27). A sleeve step (28) is formed between the outer circle (25) of the second sleeve and the outer circle (26) of the third sleeve. The cam disk (4) has an annular boss (43) extending axially. The wear-resistant ring (42) abuts against the annular boss (43) and faces the first step surface of the sleeve step (28). The wear-resistant bushing (5) is embedded in the inner hole of the cam disk (4) and sleeved on the second step surface of the sleeve step (28). The wear-resistant ring has an annular structure and is die-cast from non-metallic material. An arc-shaped annular groove (421) is provided on the side facing the first step surface of the sleeve step (28), and it abuts against the second step surface of the sleeve step (28). The cam disk (4) is made of nylon; The tower (41) has a cylindrical structure.

2. The cam roller type one-way clutch according to claim 1, characterized in that, A retaining ring (7) for fixing the cam is provided on the second step surface of the sleeve step (28).

3. A cam-roller type one-way clutch according to claim 1, characterized in that, The chamber (21) includes an L-shaped spring chamber (211) and an eccentric arc surface (212) connected to each other. The roller (23) is disposed in the eccentric arc surface (212). The spring (22) is disposed in the L-shaped spring chamber (211) and abuts against the side wall (31) of the roller (23) and the L-shaped spring chamber (211) respectively, so that the side of the roller (23) contacts the eccentric arc surface (212) and the outer circle (12) of the second gear respectively.

4. A cam-roller type one-way clutch according to claim 1, characterized in that, The chamber (21) is evenly arranged in five circumferential directions.

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