One-way clutch and derailleur

Abstract

The utility model discloses a one-way clutch and discloses a derailleur with the one-way clutch, and the one-way clutch comprises a shell, an input shaft, an output shaft, four roller sets and two shifting pieces. A circular cavity is formed in the shell, and the input shaft and the output shaft both extend into the cavity and are coaxially arranged. The end face of the output shaft is provided with a blind groove, the input shaft extends into the blind groove, and the output shaft and the input shaft can rotate relatively. The outer circle of the output shaft is divided into four parts, each part comprises two arc sections with different diameters, and the output shaft further comprises two slopes and two smooth transition sections which are arranged corresponding to the four roller sets. The shifting pieces are symmetrically connected to the input shaft and abut against the rollers along with rotation so as to drive the rollers of the roller set to move between the output shaft and the inner wall of the shell. The clutch has few parts, and the output shaft, the roller and the shell are not easy to damage, so that the one-way clutch is higher in structural reliability.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a one-way clutch and a derailleur having the same. Background Technology

[0002] With the development of bicycle derailleur technology, the derailleur system has progressed from the traditional derailleur to the current electric derailleur, eliminating the cable and achieving derailleur shifting through mechanisms such as motors, clutches, and derailleur arms. However, when bicycles are used to dealing with complex road conditions for a long time, chain slapping is prone to occur. The current clutch structure has many components and is relatively complex, making it prone to damage, which in turn damages the transmission mechanism and motor. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a one-way clutch with fewer components, a simpler structure, and higher reliability.

[0004] This utility model also proposes a derailleur with the above-mentioned one-way clutch.

[0005] A one-way clutch according to a first aspect of the present invention includes: a housing, an input shaft, an output shaft, four roller sets, two paddles, and two retainers. The housing contains a circular cross-section chamber. One end of the input shaft is disposed within the chamber. One end of the output shaft is disposed within the chamber and coaxially arranged with the input shaft. A blind groove is formed on one end face of the output shaft, and one end of the input shaft extends into the blind groove. The output shaft is rotatable relative to the input shaft. The outer circular surface of the output shaft has a first direction and a second direction, which are perpendicular to each other. The first and second directions divide the outer circular surface of the output shaft into four equal parts, which are symmetrically arranged about the first and second directions as axes of symmetry. Each part includes a first arc segment, a first transition segment, a first smooth transition segment, a second transition segment, a second smooth transition segment, and a second arc segment connected sequentially. The center of the first arc segment coincides with the central axis of the output shaft. The distance between the first arc segment and the central axis of the output shaft is... The distance between the second arc segment and the central axis of the output shaft is greater than the distance between the first gradient segment and the second arc segment and the central axis of the output shaft. The distance between the first arc segment and the second arc segment and the central axis of the output shaft gradually decreases along the direction from the first arc segment to the second arc segment, and the distance between the second gradient segment and the central axis of the output shaft gradually increases along the direction from the first arc segment to the second arc segment. Four roller groups are arranged correspondingly to the four parts. One roller group includes a first roller and a second roller. The inner wall of the chamber, the first gradient segment, and the second gradient segment surround the first roller, and the first roller can abut against the inner wall of the chamber and the first gradient segment. The inner wall of the chamber and the second arc segment surround the second roller. Two paddles are symmetrically connected to one end of the input shaft. The two paddles are symmetrically arranged in the second direction. When the output shaft and the input shaft rotate relative to each other, the paddles abut against one roller of the roller group. Two cages are symmetrically arranged in the first direction. The cages abut against the rollers of two adjacent roller groups.

[0006] It has at least the following beneficial effects:

[0007] One-way clutches have fewer components. The housing protects one end of the input shaft, one end of the output shaft, the roller assembly, the paddles, and the cage. The rollers in the roller assembly move within the gap between the outer surface of the output shaft and the inner wall of the housing. When the input shaft drives the output shaft, the rollers rotate within the chamber. When the output shaft drives the input shaft, some rollers are stuck between the outer surface of the output shaft and the inner wall of the housing, while others obstruct the rotation of the output shaft. The output shaft, rollers, and housing are not easily damaged, making the one-way clutch highly reliable.

[0008] According to some embodiments of this utility model, it also includes a follower, which is sleeved on the input shaft and rotates synchronously with the input shaft. Two paddles are connected to the follower, and the two paddles and the follower form a U-shaped structure.

[0009] According to some embodiments of this utility model, the follower is provided with a waist-shaped hole, and the cross-section of one end of the input shaft matches the waist-shaped hole.

[0010] According to some embodiments of the present invention, two parallel planes are formed on the outer circular surface of one end of the input shaft, and the size of the slot of the blind groove is larger than the size of one end of the input shaft, so that the input shaft can rotate relative to the output shaft.

[0011] According to some embodiments of the present invention, the output shaft is capable of rotating relative to the input shaft by an angle α, wherein the angle α is less than 7°.

[0012] According to some embodiments of the present invention, the housing includes a bottom shell and a cover plate, the cover plate being connected to the housing, the bottom shell having a stepped hole, the cover plate covering the larger end of the stepped hole, the bottom shell and the housing forming the cavity in the region of the larger end of the stepped hole, one end of the output shaft passing through the stepped hole, the cover plate having a through hole, and one end of the input shaft passing through the through hole.

[0013] According to some embodiments of the present invention, the output shaft is provided with a first shoulder in the middle, and the first shoulder abuts against the stepped surface of the stepped hole to limit one end of the output shaft in the cavity.

[0014] According to some embodiments of the present invention, the bottom of the blind groove is provided with a positioning groove, and the end face of one end of the input shaft is provided with a positioning post, the positioning post cooperating with the positioning groove.

[0015] According to some embodiments of the present invention, the first roller and the second roller have the same structure and are both cylindrical, and both the first roller and the second roller are parallel to the input shaft.

[0016] A derailleur according to a second aspect of the present invention includes a derailleur body and a one-way clutch according to the first aspect of the present invention, wherein a motor of the derailleur body is connected to the derailleur arm of the derailleur body via the one-way clutch.

[0017] It has at least the following beneficial effects:

[0018] This derailleur has all the beneficial effects of the aforementioned one-way clutch, which will not be repeated here.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0022] Figure 2 This is an exploded structural diagram of an embodiment of the present utility model;

[0023] Figure 3 This is a longitudinal sectional view of the structure of this utility model.

[0024] Figure 4 This is a cross-sectional view of the structure of this utility model.

[0025] Figure 5 This is a side view of the output shaft structure according to the present invention.

[0026] Figure 6 This is a cross-sectional view of the structure of the present invention when the input shaft rotates counterclockwise.

[0027] Figure 7 This is a cross-sectional view of the structure of the present invention when the input shaft rotates clockwise.

[0028] Icon labels:

[0029] Shell 1, bottom shell 11, cover plate 12;

[0030] Input shaft 2, positioning pin 21;

[0031] Output shaft 3, blind slot 31, positioning slot 311, first arc segment 32, fourth arc segment 32a, fifth arc segment 32b, eighth arc segment 32c, first gradient segment 33, fourth gradient segment 33a, fifth gradient segment 33b, eighth gradient segment 33c, second gradient segment 34, third gradient segment 34a, sixth gradient segment 34b, seventh gradient segment 34c, second arc segment 35, third arc segment 35a, sixth arc segment 35b, seventh arc segment 35c, first shoulder 36;

[0032] Roller group 4, first roller 41, second roller 42, third roller 43, fourth roller 44, fifth roller 45, sixth roller 46, seventh roller 47, eighth roller 48;

[0033] Pick 5;

[0034] Cage 6;

[0035] Follower 7. Detailed Implementation

[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] Reference Figures 1 to 4 This utility model discloses a one-way clutch, comprising: a housing 1, an input shaft 2, an output shaft 3, four roller sets 4, two paddles 5, and two retainers 6.

[0040] The housing 1 has a circular cross-section chamber inside, and the housing 1 is used to connect with the derailleur body.

[0041] One end of the input shaft 2 is located inside the cavity, and the other end of the input shaft 2 is used to connect to the motor drive.

[0042] One end of the output shaft 3 is located in the cavity and is coaxially arranged with the input shaft 2. The other end of the output shaft 3 is used for transmission connection with the gearbox arm. A blind groove 31 is provided on the end face of one end of the output shaft 3. One end of the input shaft 2 extends into the blind groove 31. The output shaft 3 can rotate relative to the input shaft 2.

[0043] Reference Figure 5The outer circular surface of the output shaft 3 has a first direction and a second direction, which are perpendicular to each other. The first direction and the second direction divide the outer circular surface of the output shaft 3 into four equal parts. The four parts are symmetrically arranged about the first direction and the second direction as the axis of symmetry. Each part includes a first arc segment 32, a first gradient segment 33, a first smooth transition segment, a second gradient segment 34, a second smooth transition segment, and a second arc segment 35 connected in sequence. The center of the circle corresponding to the first arc segment 32 coincides with the central axis of the output shaft 3. The distance between the first arc segment 32 and the central axis of the output shaft 3 is greater than the distance between the second arc segment 35 and the central axis of the output shaft 3. The distance between the first gradient segment 33 and the second arc segment 35 and the central axis of the output shaft 3 gradually decreases from the first arc segment 32 to the second arc segment 35. The distance between the second gradient segment 34 and the central axis of the output shaft 3 gradually increases from the first arc segment 32 to the second arc segment 35. Similarly, the outer circular surface of the output shaft 3 also includes, in sequence, a third arc segment 35a, a third gradient segment 34a, a third smooth transition segment, a fourth gradient segment 33a, a fourth smooth transition segment, a fourth arc segment 32a, a fifth arc segment 32b, a fifth gradient segment 33b, a fifth smooth transition segment, a sixth gradient segment 34b, a sixth smooth transition segment, a sixth arc segment 35b, a seventh arc segment 35c, a seventh gradient segment 34c, a seventh smooth transition segment, an eighth gradient segment 33c, an eighth smooth transition segment, and an eighth arc segment 32c. The eighth arc segment 32c is connected to the first arc segment 32, and the second arc segment 35 is connected to the third arc segment 35a.

[0044] The centers of the circles corresponding to the first arc segment 32, the fourth arc segment 32a, the fifth arc segment 32b, and the eighth arc segment 32c all coincide with the central axis of the output shaft 3. The first arc segment 32 and the eighth arc segment 32c are symmetrically arranged with the first direction as the axis of symmetry. The first arc segment 32 and the fourth arc segment 32a are symmetrically arranged with the second direction as the axis of symmetry. The fourth arc segment 32a and the fifth arc segment 32b are symmetrically arranged with the first direction as the axis of symmetry. The fifth arc segment 32b and the eighth arc segment 32c are symmetrically arranged with the second direction as the axis of symmetry.

[0045] The circles corresponding to the second arc segment 35 and the third arc segment 35a have the same center, the circles corresponding to the sixth arc segment 35b and the seventh arc segment 35c have the same center, the circles corresponding to the second arc segment 35 and the sixth arc segment 35b have the same diameter, the second arc segment 35 and the third arc segment 35a are symmetrically arranged about a second direction as an axis of symmetry, the third arc segment 35a and the sixth arc segment 35b are symmetrically arranged about a first direction as an axis of symmetry, the sixth arc segment 35b and the seventh arc segment 35c are symmetrically arranged about a second direction as an axis of symmetry, and the seventh arc segment 35c and the second arc segment 35 are symmetrically arranged about a first direction as an axis of symmetry.

[0046] The second gradient segment 34 and the third gradient segment 34a are symmetrically arranged with the second direction as the axis of symmetry. The third gradient segment 34a and the sixth gradient segment 34b are symmetrically arranged with the first direction as the axis of symmetry. The sixth gradient segment 34b and the seventh gradient segment 34c are symmetrically arranged with the second direction as the axis of symmetry. The seventh gradient segment 34c and the second gradient segment 34 are symmetrically arranged with the first direction as the axis of symmetry.

[0047] The first gradient segment 33 and the fourth gradient segment 33a are symmetrically arranged with the second direction as the axis of symmetry. The fourth gradient segment 33a and the fifth gradient segment 33b are symmetrically arranged with the first direction as the axis of symmetry. The fifth gradient segment 33b and the eighth gradient segment 33c are symmetrically arranged with the second direction as the axis of symmetry. The eighth gradient segment 33c and the first gradient segment 33 are symmetrically arranged with the first direction as the axis of symmetry.

[0048] Reference Figure 2 and Figure 4 Four roller groups 4 are all located within the cavity, and the four roller groups 4 are positioned between the output shaft 3 and the inner wall of the housing 1. The four roller groups 4 are correspondingly arranged with four parts. Each roller group 4 includes a first roller 41 and a second roller 42. The inner wall of the cavity, the first gradient section 33, and the second gradient section 34 surround the first roller 41, and the first roller 41 can abut against the inner wall of the cavity and the first gradient section 33. The inner wall of the cavity and the second arc section 35 surround the second roller 42.

[0049] Two paddles 5 are symmetrically connected to one end of the input shaft 2. The two paddles 5 are parallel to each other and are both located in the cavity. The two paddles 5 are symmetrically arranged in the second direction. When the output shaft 3 and the input shaft 2 rotate relative to each other by a certain angle, the paddle 5 abuts against one of the rollers of the roller group 4.

[0050] Both retainers 6 are located within the cavity, and are situated between the output shaft 3 and the inner wall of the housing 1. The two retainers 6 are symmetrically arranged in a first direction, and abut against the rollers of two adjacent roller sets 4.

[0051] The three roller groups 4 include a third roller 43, a fourth roller 44, a fifth roller 45, a sixth roller 46, a seventh roller 47, and an eighth roller 48. The first roller 41, the second roller 42, the third roller 43, the fourth roller 44, the fifth roller 45, the sixth roller 46, the seventh roller 47, and the eighth roller 48 are arranged in a ring. A lever 5 is located between the first roller 41 and the eighth roller 48, and another lever 5 is located between the fourth roller 44 and the fifth roller 45. A cage 6 is located between the second roller 42 and the third roller 43, with both ends of the cage 6 abutting against the second roller 42 and the third roller 43, respectively. Another cage 6 is located between the sixth roller 46 and the seventh roller 47, with both ends of the cage 6 abutting against the sixth roller 46 and the seventh roller 47, respectively.

[0052] Reference Figures 4 to 6 The input shaft 2, carrying two paddles 5, rotates counterclockwise. After the input shaft 2 rotates relative to the output shaft 3 by a certain angle, one paddle 5 abuts against the eighth roller 48 and drives the eighth roller 48 to move counterclockwise. The eighth roller 48, the seventh roller 47, a cage 6, the sixth roller 46, and the fifth roller 45 abut in sequence. The eighth roller 48 is located between the eighth transition section 33c, the seventh transition section 34c, and the inner wall of the chamber. The sixth roller 46 and the seventh roller 47 are located between the sixth arc section 35b, the seventh arc section 35c, and the inner wall of the chamber. The fifth roller 45 is located between the fifth transition section 33b, the sixth transition section 34b, and the inner wall of the chamber. The fifth roller 45, the sixth roller 46, the seventh roller 47, and the eighth roller 48 will not be jammed by the inner wall of the chamber and the outer surface of the output shaft 3, so that the input shaft 2 can continuously drive or carry the output shaft 3 to rotate counterclockwise.

[0053] Similarly, another paddle 5 abuts against the fourth roller 44 and drives the fourth roller 44 to move counterclockwise. The fourth roller 44, the third roller 43, another cage 6, the second roller 42 and the first roller 41 abut against each other in sequence. The first roller 41, the second roller 42, the third roller 43 and the fourth roller 44 will not be jammed by the inner wall of the chamber and the outer surface of the output shaft 3, so that the input shaft 2 can continuously drive or carry the output shaft 3 to rotate counterclockwise.

[0054] Reference Figure 4 , Figure 5 and Figure 7 The input shaft 2, carrying two paddles 5, rotates clockwise. After the input shaft 2 rotates relative to the output shaft 3 by a certain angle, one paddle 5 abuts against the first roller 41 and drives the first roller 41 to move clockwise. The first roller 41, the second roller 42, the other cage 6, the third roller 43, and the fourth roller 44 abut in sequence. The first roller 41 is located between the first transition section 33, the second transition section 34, and the inner wall of the chamber. The second roller 42 and the third roller 43 are located between the second arc section 35, the third arc section 35a, and the inner wall of the chamber. The fourth roller 44 is located between the third transition section 34a, the fourth transition section 33a, and the inner wall of the chamber. The first roller 41, the second roller 42, the third roller 43, and the fourth roller 44 will not be jammed by the inner wall of the chamber and the outer surface of the output shaft 3, so that the input shaft 2 can continuously drive or carry the output shaft 3 to rotate clockwise.

[0055] Similarly, another paddle 5 abuts against the fifth roller 45 and drives the fifth roller 45 to move clockwise. The fifth roller 45, the sixth roller 46, a cage 6, the seventh roller 47 and the eighth roller 48 abut against each other in sequence. The fifth roller 45, the sixth roller 46, the seventh roller 47 and the eighth roller 48 will not be jammed by the inner wall of the chamber and the outer surface of the output shaft 3, so that the input shaft 2 can continuously drive or carry the output shaft 3 to rotate in the clockwise direction.

[0056] Reference Figure 4 and Figure 5 When the output shaft 3 rotates counterclockwise, the eighth roller 48 will be engaged between the eighth transition section 33c and the inner wall of the chamber, and the fourth roller 44 will be engaged between the fourth transition section 33a and the inner wall of the chamber. The eighth roller 48 and the fourth roller 44 prevent the output shaft 3 from continuing to rotate counterclockwise. When the output shaft 3 rotates clockwise, the first roller 41 will be engaged between the first transition section 33 and the inner wall of the chamber, and the fifth roller 45 will be engaged between the fifth transition section 33b and the inner wall of the chamber. The first roller 41 and the fifth roller 45 prevent the output shaft 3 from continuing to rotate clockwise.

[0057] In summary, input shaft 2 can drive output shaft 3 to rotate in both counterclockwise and clockwise directions, while output shaft 3 cannot drive input shaft 2 to rotate in both counterclockwise and clockwise directions. The one-way clutch enables input shaft 2 to drive output shaft 3 to rotate, but output shaft 3 cannot drive input shaft 2 to rotate.

[0058] The components of a one-way clutch include a housing 1, an input shaft 2, an output shaft 3, a roller assembly 4, a paddle 5, and a cage 6. The number of components is relatively small. The housing 1 protects one end of the input shaft 2, one end of the output shaft 3, the roller assembly 4, the paddle 5, and the cage 6. The rollers of the roller assembly 4 move within the gap between the outer surface of the output shaft 3 and the inner wall of the housing 1. When the input shaft 2 drives the output shaft 3, the rollers rotate within the chamber. When the output shaft 3 drives the input shaft 2, some rollers become stuck between the outer surface of the output shaft 3 and the inner wall of the housing 1, while others obstruct the rotation of the output shaft 3. The output shaft 3, rollers, and housing 1 are not easily damaged, resulting in a high structural reliability for the one-way clutch.

[0059] Understandably, both the first gradient section 33 and the second gradient section 34 can be planar or curved. The cage 6 is made of an elastic material, and its elasticity allows for fine adjustment of the spacing between the rollers of two adjacent roller groups 4.

[0060] Reference Figure 2 and Figure 3In some embodiments, the one-way clutch further includes a follower 7, which is sleeved on the input shaft 2 and rotates synchronously with the input shaft 2. Two paddles 5 are connected to the follower 7, and the two paddles 5 are connected to the input shaft 2 through the follower 7. The two paddles 5 and the follower 7 form a U-shaped structure, such that one paddle 5 is inserted between the eighth roller 48 and the first roller 41, and the other paddle 5 is inserted between the fourth roller 44 and the fifth roller 45.

[0061] In some embodiments, the follower 7 has an oblong hole, and the cross-section of one end of the input shaft 2 matches the oblong hole. One end of the input shaft 2 passes through the oblong hole, so that the input shaft 2 can drive the follower 7 to rotate synchronously, thereby enabling the input shaft 2 to drive the two paddles 5 to rotate synchronously.

[0062] In another embodiment, the follower 7 has a mounting hole with a regular polygonal cross-section, and the cross-section of one end of the input shaft 2 matches the mounting hole. Alternatively, the follower 7 has a mounting hole with a circular cross-section, and the follower 7 is connected to the input shaft 2 by a key connection.

[0063] It is understandable that the follower 7 and the two paddles 5 are integrally formed. The middle section of the input shaft 2 is provided with a second shoulder, and the follower 7 abuts against the second shoulder. When the input shaft 2 and the output shaft 3 are installed in place, the second shoulder prevents the follower 7 and the two paddles 5 from moving away from the roller assembly 4.

[0064] Reference Figure 2 In some embodiments, two parallel planes are formed on the outer circular surface of one end of the input shaft 2, and the two planes are equidistant from the central axis of the input shaft 2.

[0065] The size of the slot 31 is larger than the size of one end of the input shaft 2 so that the input shaft 2 can rotate relative to the output shaft 3, and then the input shaft 2 can drive the output shaft 3 to continue rotating.

[0066] It is conceivable that the cross-section of the blind slot 31 and the cross-section of one end of the input shaft 2 are both oblong or regular polygonal.

[0067] Reference Figure 5 In another embodiment, the cross-section of the blind groove 31 includes a first part, a second part, a third part, and a fourth part connected end to end. The first part and the third part are symmetrically arranged about a second direction as an axis of symmetry. The first part and the third part are circular in shape. The second part and the fourth part are symmetrically arranged about a first direction as an axis of symmetry. The second part includes two oblique lines. The two oblique lines are symmetrically arranged about a first direction as an axis of symmetry. The angle between the oblique lines and the second direction is α. The minimum distance between the second part and the fourth part is equal to the distance between the two planes on one end of the input shaft 2.

[0068] Reference Figure 5 , Figure 6 and Figure 7 In some embodiments, the output shaft 3 can rotate relative to the input shaft 2 by an angle α, where the angle α is less than 7°.

[0069] The cross-section of the paddle 5 is fan-shaped. The paddle 5 has two end faces, and the planes on which the two end faces are located coincide with the two radii of the input shaft 2 respectively. The two end faces of one paddle 5 are used to abut against the first roller 41 and the eighth roller 48 respectively, and the two end faces of the other paddle 5 are used to abut against the fourth roller 44 and the fifth roller 45 respectively.

[0070] Reference Figures 1 to 3 In some embodiments, the housing 1 includes a bottom shell 11 and a cover plate 12, which are connected by a snap-fit ​​structure, welding, or adhesive.

[0071] The bottom shell 11 is provided with a stepped hole, which has a large end and a small end. The diameter of the large end is larger than that of the small end. There is a stepped surface between the large end and the small end. The cover plate 12 covers the large end of the stepped hole. The bottom shell 11 and the shell 1 form a cavity in the area of ​​the large end of the stepped hole. One end of the output shaft 3 passes through the stepped hole. The cover plate 12 is provided with a through hole. One end of the input shaft 2 passes through the through hole.

[0072] Reference Figure 2 and Figure 3 In some embodiments, the output shaft 3 is provided with a first shoulder 36 in the middle, which abuts against the stepped surface of the stepped hole to limit one end of the output shaft 3 in the cavity and prevent one end of the output shaft 3 from leaving the cavity.

[0073] Reference Figure 3 and Figure 5 In some embodiments, the bottom of the blind slot 31 is provided with a positioning slot 311, and the end face of one end of the input shaft 2 is provided with a positioning post 21. The positioning post 21 cooperates with the positioning slot 311, and the positioning post 21 extends into the positioning slot 311. The positioning slot 311 serves to center the positioning post 21 and the input shaft 2.

[0074] The bottom shell 11, cover plate 12, stepped hole, through hole, input shaft 2, positioning post 21, output shaft 3, blind groove 31 and positioning groove 311 are coaxially arranged.

[0075] Reference Figure 2 In some embodiments, the first roller 41, the second roller 42, the third roller 43, the fourth roller 44, the fifth roller 45, the sixth roller 46, the seventh roller 47, and the eighth roller 48 have the same structure and are all cylindrical. The first roller 41, the second roller 42, the third roller 43, the fourth roller 44, the fifth roller 45, the sixth roller 46, the seventh roller 47, and the eighth roller 48 are all parallel to the input shaft 2.

[0076] This utility model discloses a derailleur, including a derailleur body and the aforementioned one-way clutch. The motor of the derailleur body is connected to the derailleur arm via the one-way clutch.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A one-way clutch, characterized in that, include: The shell (1) has a cavity with a circular cross-section inside; The input shaft (2) has one end located inside the cavity; The output shaft (3) has one end located in the cavity and is coaxially arranged with the input shaft (2). A blind groove (31) is provided on one end face of the output shaft (3). One end of the input shaft (2) extends into the blind groove (31). The output shaft (3) can rotate relative to the input shaft (2). The outer circular surface of the output shaft (3) has a first direction and a second direction, which are perpendicular to each other. The first direction and the second direction divide the outer circular surface of the output shaft (3) into four equal parts. The four parts are symmetrically arranged about the first direction and the second direction as the axis of symmetry. Each part includes a first arc segment (32), a first gradient segment (33), a first smooth transition segment, a second gradient segment (34), a second smooth transition segment, and a second arc segment (35) connected in sequence. The first arc segment (32) corresponds to... The center of the circle coincides with the central axis of the output shaft (3). The gap between the first arc segment (32) and the inner wall of the chamber is smaller than the gap between the second arc segment (35) and the inner wall of the chamber. The gap between the first transition segment (33) and the second arc segment (35) and the inner wall of the chamber gradually increases along the direction from the first arc segment (32) to the second arc segment (35). The gap between the second transition segment (34) and the inner wall of the chamber gradually decreases along the direction from the first arc segment (32) to the second arc segment (35). Four roller groups (4) are arranged corresponding to the four parts. Each roller group (4) includes a first roller (41) and a second roller (42). The inner wall of the chamber, the first gradient section (33) and the second gradient section (34) surround the first roller (41), and the first roller (41) can abut against the inner wall of the chamber and the first gradient section (33). The inner wall of the chamber and the second arc section (35) surround the second roller (42). Two paddles (5) are symmetrically connected to one end of the input shaft (2). The two paddles (5) are symmetrically arranged in the second direction. When the output shaft (3) and the input shaft (2) rotate relative to each other, the paddles (5) abut against one of the rollers of the roller group (4). Two retainers (6) are arranged symmetrically in the first direction, and the retainers (6) abut against the rollers of the two adjacent roller groups (4).

2. The one-way clutch according to claim 1, characterized in that, It also includes a follower (7), which is sleeved on the input shaft (2) and rotates synchronously with the input shaft (2). Two paddles (5) are connected to the follower (7), and the two paddles (5) and the follower (7) form a U-shaped structure.

3. The one-way clutch according to claim 2, characterized in that, The follower (7) has a waist-shaped hole, and the cross-section of one end of the input shaft (2) matches the waist-shaped hole.

4. The one-way clutch according to claim 1, characterized in that, Two parallel planes are formed on the outer circular surface of one end of the input shaft (2). The size of the slot (31) is larger than the size of one end of the input shaft (2) so that the input shaft (2) can rotate relative to the output shaft (3).

5. The one-way clutch according to claim 1 or 4, characterized in that, The output shaft (3) can rotate relative to the input shaft (2) by an angle α, where the angle α is less than 7°.

6. The one-way clutch according to claim 1, characterized in that, The housing (1) includes a bottom shell (11) and a cover plate (12). The cover plate (12) is connected to the housing (1). The bottom shell (11) has a stepped hole. The cover plate (12) covers the large end of the stepped hole. The bottom shell (11) and the housing (1) form the cavity in the area of ​​the large end of the stepped hole. One end of the output shaft (3) passes through the stepped hole. The cover plate (12) has a through hole. One end of the input shaft (2) passes through the through hole.

7. The one-way clutch according to claim 6, characterized in that, The output shaft (3) is provided with a first shoulder (36) in the middle. The first shoulder (36) abuts against the stepped surface of the stepped hole to limit one end of the output shaft (3) in the cavity.

8. The one-way clutch according to claim 1, characterized in that, The bottom of the blind groove (31) is provided with a positioning groove (311), and the end face of one end of the input shaft (2) is provided with a positioning post (21), which cooperates with the positioning groove (311).

9. The one-way clutch according to claim 1, characterized in that, The first roller (41) and the second roller (42) have the same structure and are both columnar. The first roller (41) and the second roller (42) are both parallel to the input shaft (2).

10. A derailleur, characterized in that, The device includes a derailleur body and a one-way clutch as described in any one of claims 1 to 9, wherein the motor of the derailleur body is connected to the derailleur arm of the derailleur body via the one-way clutch.

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