Ratchet type one-way clutch

Abstract

The invention provides a ratchet type one-way clutch in which all claw members can be stably engaged with a tooth part. The ratchet-type one-way clutch has an outer ring, an inner ring, and first to n-th claw members, a plurality of teeth capable of engaging with the first to n-th claw members are formed on the outer peripheral surface of the inner ring, first to n-th claw member holding portions for holding the first to n-th claw members are formed on the inner peripheral surface of the outer ring, and biasing members for biasing the first to n-th claw members are provided on the first to n-th claw member holding portions. When viewed from the central axis, the second to n-th claw member holding portions are provided at positions shifted by any angle from positions equally dividing the inner peripheral surface of the outer ring in the circumferential direction by n with respect to the position of the first claw member holding portion as a reference.

Description

Technical Field

[0001] The present invention relates to a ratchet-type one-way clutch used as a torque transmission mechanism or a backstop in vehicles, industrial machinery, and the like. Background Art

[0002] Conventionally, there is known a ratchet-type one-way clutch having a ratchet mechanism including a plurality of pawl members provided on the inner circumference of an outer ring and a plurality of teeth provided on the outer circumference of an inner ring so as to mesh with the plurality of pawl members (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2001-208104 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the design of a ratchet-type one-way clutch, in order to maximize the torque that can be transmitted between the inner ring and the outer ring, generally multiple claw members are engaged with multiple teeth at the same time, and each claw member shares the torque load.

[0008] However, in reality, due to the manufacturing errors of the components of the ratchet-type one-way clutch, namely the outer ring, the inner ring and the claw member, when the torque is transmitted between the inner ring and the outer ring, the possibility of multiple claw members equally bearing the torque load is low. In detail, initially one of the claw members engages with the tooth portion, and as the torque increases, the components elastically deform, so that the other claw members begin to engage with the tooth portion. In addition, which claw member initially bears the torque load is random, so depending on the manufacturing errors of the components and the position of the claw member that initially bears the torque load, it is possible that a claw member cannot engage with the tooth portion. And, as a result, the ratchet-type one-way clutch may have a torque capacity that is smaller than expected, and may be damaged.

[0009] Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a ratchet-type one-way clutch in which all the pawl members can be stably engaged with the teeth.

[0010] Means for solving problems

[0011] In order to solve the above problems, the present invention provides a ratchet-type one-way clutch, characterized in that it has:

[0012] Cylindrical outer ring;

[0013] a cylindrical inner ring arranged radially inward of the outer ring in a relatively rotatable manner; and

[0014] first to n-th claw members, the first to n-th claw members are arranged on the inner circumference side of the outer ring in a manner that allows rotation in the radial direction,

[0015] A plurality of teeth that can be engaged with the first to n-th claw members are formed on the outer peripheral surface of the inner ring.

[0016] The inner peripheral surface of the outer ring is formed with first to n-th claw member holding portions for holding the first to n-th claw members.

[0017] The first to n-th claw member holding portions are provided with urging members for urging the first to n-th claw members toward the inner ring side.

[0018] When viewed from the central axis of the outer ring, the second to n-th claw member holding portions are arranged at positions offset by an arbitrary angle (n≥2) from a position where the inner circumferential surface of the outer ring is divided into n equal parts in the circumferential direction based on the position of the first claw member holding portion.

[0019] Effects of the Invention

[0020] According to the present invention, it is possible to provide a ratchet-type one-way clutch in which all the pawl members can stably engage with the teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view showing a state in which a cross section perpendicular to the axial direction of the ratchet one-way clutch according to the embodiment of the present invention is viewed from one axial side.

[0022] Figure 2 (a)~ Figure 2 (c) means Figure 1 1 is a partially enlarged view of the configuration of first to third pawl members and first to third pawl member holding portions in the ratchet type one-way clutch according to the embodiment of the present invention.

[0023] Description of Reference Numerals

[0024] 1 One-way clutch

[0025] 2 Outer ring

[0026] 3 Inner ring

[0027] 4a to 4c: 1st to 3rd claw members

[0028] 5Inner ring teeth

[0029] 6. Tooth wall (meshing surface)

[0030] 12a to 12c: 1st to 3rd claw member holding parts

[0031] 13a to 13c: first recessed portion of the first to third claw member holding portions

[0032] 14a to 14c: second recessed portions of the first to third claw member holding portions

[0033] 15a to 15c Elastic members of the first to third claw member holding portions

[0034] 16a to 16c: circular portions of the first to third claw members

[0035] 17a to 17c claws of the first to third claw members

[0036] 18a to 18c Center of the circular portion of the first to third claw members

[0037] 21a to 21c Center of the first recess of the first to third claw member holding portions

[0038] 25a~25c Load application point of elastic component

[0039] OThe center axis of the inner and outer rings DETAILED DESCRIPTION

[0040] A ratchet-type one-way clutch (hereinafter simply referred to as a “one-way clutch”) according to an embodiment of the present invention will be described with reference to the drawings.

[0041] First of all, Figure 1 The axial direction, radial direction and circumferential direction of the one-way clutch 1 refer to the axial direction, radial direction and circumferential direction relative to the central axis O of the one-way clutch 1 (i.e., the central axis of the outer ring 2 and the inner ring 3). Figure 1 The front side of the paper is regarded as one axial side, and the inner side of the paper is regarded as the other axial side. Figure 1 The clockwise rotation direction of the paper is regarded as one side of the circumference (also called the clockwise direction). Figure 1 The rotation direction of the paper surface counterclockwise is referred to as the other circumferential side (also referred to as the counterclockwise direction). In addition, regarding the rotation of the one-way clutch 1, the rotation of the inner ring 3 relative to the outer ring 2 is described, but the rotation of the outer ring 2 and the rotation of the inner ring 3 are relative.

[0042] like Figure 1 As shown, the one-way clutch 1 has a cylindrical outer ring 2, a cylindrical inner ring 3 that can rotate relative to the outer ring 2, and a torque transmission mechanism for transmitting torque from the inner ring 3 to the outer ring 2. The torque transmission mechanism of the one-way clutch 1 adopts a ratchet mechanism including first to third pawl members 4a to 4c provided on the inner circumference of the outer ring 2.

[0043] The inner ring 3 is radially away from the outer ring 2, has a smaller diameter than the outer ring 2 and is coaxial with the outer ring 2. On the outer peripheral surface of the inner ring 3, a plurality of teeth 5 protruding radially outward and extending in the axial direction are arranged at equal intervals along the circumference over the entire circumference of the outer peripheral surface. The plurality of teeth 5 have a trapezoidal cross-section when viewed from one axial side, and constitute ratchet teeth for the first to third pawl members 4a to 4c to mesh with. Specifically, the first to third pawl members 4a to 4c mesh with the wall surface 6 on one circumferential side (clockwise side) of the teeth 5. Here, the portion between the teeth 5 on the outer peripheral surface of the inner ring 3 is referred to as the bottom surface 7, and the situation where the first to third pawl members 4a to 4c enter between the teeth 5 is referred to as falling to or reaching the bottom surface 7.

[0044] The inner peripheral surface of the inner ring 3 forms an axial hole 8. A shaft 9 concentric with the inner ring 3 is fitted into the axial hole 8, and the inner ring 3 and the shaft 9 can rotate integrally. The shaft 9 is connected to a drive device (not shown) via a gear mechanism (not shown), for example. In addition, the shaft 9 and the axial hole 8 may also be splined.

[0045] A plurality of convex portions 11 protruding radially outward and extending axially are provided on the outer peripheral surface of the outer ring 2. The convex portion 11 has a trapezoidal cross section when viewed from one axial side and is fitted with a shaft (not shown) connected to a driven device (not shown).

[0046] On the inner circumference of the outer ring 2, first to third claw member holding portions 12a to 12c extending in the axial direction are formed at substantially equal intervals in the circumferential direction (see Figure 2 (a)~ Figure 2 (c) The first to third claw member holding portions 12a to 12c hold the first to third claw members 4a to 4c described above.

[0047] The first claw member holding portion 12a is a recessed portion opened radially inward on the inner peripheral surface of the outer ring 2. The first claw member holding portion 12a includes a first recessed portion 13a and a second recessed portion 14a continuously formed adjacent to the first recessed portion 13a on the other side in the circumferential direction.

[0048] The first recessed portion 13a of the first claw member holding portion 12a is a circular portion recessed from the inner peripheral surface of the outer ring 2 toward one circumferential side and radially outward when viewed from one axial side, and holds the first claw member 4a in a swingable manner.

[0049] When viewed from one axial side, the second recess 14a of the first claw member holding portion 12a is rectangular and is recessed from the inner circumferential surface of the outer ring 2 toward the other circumferential side and radially outward. A recessed portion 14a is also formed on the bottom surface of the second recess 14a. Figure 2 (a)~ Figure 2The recess shown by the dotted line in (c) is provided with an elastic member 15a as a biasing member for biasing the first claw member 4a toward the inner ring 3. In addition, the bottom surface of the recess provided with the elastic member 15a is referred to as the setting surface of the elastic member 15a.

[0050] The second and third claw member holding parts 12b and 12c have the same structure as the first claw member holding part 12a, and include first recessed parts 13b and 13c, second recessed parts 14b and 14c, and elastic members 15b and 15c, respectively. The elastic members 15a to 15c may be, for example, coil springs.

[0051] The first claw member 4a is composed of an elongated metal member having a predetermined circumferential length and extending in the axial direction. When viewed from one axial side, the first claw member 4a includes a circular portion 16a and a rectangular claw portion 17a integrally provided with the circular portion 16a and protruding toward the other circumferential side.

[0052] The circular portion 16a of the first claw member 4a is held by the first recessed portion 13a (see FIG. 1 ) of the first claw member holding portion 12a so as to be rotatable about the center 18a of the circular portion 16a as the rotation (swing) center. Figure 2 (a)).

[0053] The claw portion 17a of the first claw member 4a is arranged in the second recess 14a of the first claw member retaining portion 12a, and is always forced toward the inner ring 3 side (radially inner side) by the elastic member 15a provided in the second recess 14a, and protrudes from the opening on the inner ring 3 side of the second recess 14a to the other circumferential side and the inner ring 3 side.

[0054] The second and third claw members 4b and 4c have the same configuration as the first claw member 4a, and include circular portions 16b and 16c and claw portions 17b and 17c, respectively.

[0055] The ratchet mechanism of the one-way clutch 1 is constituted by the teeth 5 of the inner ring 3, the first to third pawl member holding portions 12a to 12c of the outer ring 2, the first to third pawl members 4a to 4c held by the first to third pawl member holding portions 12a to 12c, and the elastic members 15a to 15c.

[0056] In the one-way clutch 1 having the above-described structure, when the inner ring 3 rotates clockwise together with the shaft 9 driven by the unillustrated driving device, the relative rotation of the inner ring 3 with respect to the outer ring 2 is fixed, and the outer ring 2 and the unillustrated shaft engaged with the outer ring 2 rotate integrally with the inner ring 3. On the other hand, when the inner ring 3 rotates counterclockwise, the inner ring 3 idles relative to the outer ring 2.

[0057] In detail, when the inner ring 3 rotates in the clockwise direction, the first to third claw members 4a to 4c of the outer ring 2 respectively mesh with the tooth portion 5 of the inner ring 3. Specifically, the top ends of the claw portions 17a to 17c of the first to third claw members 4a to 4c engage with the wall surface 6 on one side of the circumferential direction of the tooth portion 5. In this way, the wall surface 6 on one side of the circumferential direction of the tooth portion 5 constitutes the meshing surface of the tooth portion 5 that meshes with the first to third claw members 4a to 4c. By meshing the first to third claw members 4a to 4c with the tooth portion 5, the outer ring 2 rotates integrally with the inner ring 3, and the torque is transmitted from the inner ring 3 to the outer ring 2. In addition, when the outer ring 2 is fixed, the one-way clutch 1 functions as a stopper that prevents the inner ring 3 from rotating in the clockwise direction.

[0058] On the other hand, when the inner ring 3 rotates counterclockwise, the first to third claw members 4a to 4c do not mesh with the teeth 5 of the inner ring 3. Specifically, when the teeth 5 of the inner ring 3 come into contact with the first to third claw members 4a to 4c, the teeth 5 overcome the force of the elastic members 15a to 15c and push the claws 17a to 17c of the first to third claw members 4a to 4c radially outward while the inner ring 3 rotates. That is, the inner ring 3 idles relative to the outer ring 2, and no torque is transmitted from the inner ring 3 to the outer ring 2.

[0059] In the one-way clutch 1 of the present embodiment, when the first to third pawl members 4a to 4c are meshed with the tooth portion 5, the pawl portions 17a to 17c of the first to third pawl members 4a to 4c will not be bounced off by the meshing surface 6 of the tooth portion 5 in the non-meshing direction, i.e., radially outward, and climb onto the tooth portion 5, so that the first to third pawl members 4a to 4c can be reliably engaged with the tooth portion 5. The configuration of the ratchet mechanism of the present embodiment that achieves such an effect will be described in detail below.

[0060] In the present embodiment, when viewed from the central axis O of the outer ring 2, the second and third claw member holding portions 12b and 12c are respectively provided at positions offset by arbitrary angles α1 and α2 degrees from positions dividing the inner peripheral surface of the outer ring 2 into three equal parts in the circumferential direction.

[0061] Specifically, on the inner circumferential surface of the outer ring 2, the second claw member holding portion 12b is arranged so that the center 21b of the first recess 13b of the second claw member holding portion 12b is located at a position offset by an arbitrary angle α1 degree to one side in the circumferential direction (clockwise direction) from the position where the inner circumferential surface of the outer ring 2 is divided into three equal parts in the circumferential direction when viewed from the central axis O with the center 21a of the first recess 13a of the first claw member holding portion 12a (= the rotation center of the first claw member 4a). That is, with the central axis O as the center, the angle formed by the center 21a of the first recess 13a of the first claw member holding portion 12a and the center 21b of the first recess 13b of the second claw member holding portion 12b in the clockwise direction is 120+α1 degrees. The arbitrary angle α1 is preferably set in consideration of the deformation amount of each component of the one-way clutch 1, namely, the outer ring 2, the inner ring 3, and the first to third claw members 4a to 4c when elastically deformed under torque load and the mounting clearance during assembly.

[0062] On the inner circumferential surface of the outer ring 2, the third claw member holding portion 12c is arranged so that the center 21c of the first recess 13c of the third claw member holding portion 12c is located at a position offset by an arbitrary angle α2 degrees in the clockwise direction from another position that divides the inner circumferential surface of the outer ring 2 into three equal parts in the circumferential direction based on the center 21a of the first recess 13a of the first claw member holding portion 12a when viewed from the central axis O. That is, the angle formed by the center 21a of the first recess 13a of the first claw member holding portion 12a and the center 21c of the first recess 13c of the third claw member holding portion 12c in the clockwise direction with the central axis O as the center is 240+α2 degrees. In addition, the arbitrary angle α2 is preferably set in consideration of the deformation amount when each component of the one-way clutch 1 is elastically deformed under torque load and the installation clearance during assembly, and may be α2=α1. The above-described configurations of the first to third claw member holding portions 12a to 12c are referred to as "first configuration."

[0063] In the first configuration, when the inner ring 3 rotates clockwise, initially, Figure 2 As shown in FIG. 2 ( a ), the claw portion 17 a of the first claw member 4 a of the outer ring 2 falls down to reach the bottom surface 7 of the inner ring 3 and engages with the meshing surface 6 of the tooth portion 5 .

[0064] At this time, the claw portion 17b of the second claw member 4b falls and reaches the bottom surface 7 of the inner ring 3. As described above, the position of the second claw member holding portion 12b is shifted circumferentially by an arbitrary angle α1 degree from the position that divides the inner circumferential surface of the outer ring 2 into three equal parts in the circumferential direction on the inner circumferential surface of the outer ring 2 as described above, so that between the top end of the claw portion 17b of the second claw member 4b, more specifically, the end face on the other side (counterclockwise side) in the circumferential direction and the meshing surface 6 of the tooth portion 5, as shown in FIG. Figure 2As shown in (b), a gap in the circumferential direction is formed. Therefore, the claw portion 17b of the second claw member 4b does not climb up the tooth portion 5, and can fall down to reach the bottom surface 7 of the inner ring 3. In addition, due to the clockwise rotation of the inner ring 3, or due to the elastic deformation of each component caused by the torque load and the installation gap, the gap between the claw portion 17b of the second claw member 4b and the tooth portion 5 disappears, and the claw portion 17b of the second claw member 4b can engage with the meshing surface 6 of the tooth portion 5. In addition, the claw portion 17c of the third claw member 4c operates in the same manner as the claw portion 17b of the second claw member 4b when the inner ring 3 rotates in the clockwise direction.

[0065] As described above, when the inner ring 3 rotates in the clockwise direction, each claw portion 17a to 17c of the first to third claw members 4a to 4c can reliably engage with the tooth portion 5. Therefore, in the torque transmission from the inner ring 3 to the outer ring 2, the first to third claw members 4a to 4c can share the torque load. Therefore, the one-way clutch 1 can ensure the torque that can be transmitted between the inner ring 3 and the outer ring 2 to the maximum extent. In addition, it is possible to eliminate the situation where the claw member that cannot engage with the tooth portion 5 is generated, so that the torque capacity of the one-way clutch 1 can be prevented from being reduced, and further damage to the one-way clutch 1 can be prevented. In addition, there is no need to increase the number of claw members to ensure the safety of the one-way clutch 1, so the diameter expansion of the one-way clutch 1 can also be suppressed.

[0066] In the present embodiment, the setting position of the elastic member 15a in the second recess 14a of the first claw member retaining portion 12a is set to a position that is offset to the other side in the circumferential direction compared to the setting positions of the elastic members 15b, 15c in the second recesses 14b, 14c of the second and third claw member retaining portions 12b, 12c when viewed from the center axis O. Therefore, the position (referred to as the elastic member load application point) 25a at which the claw portion 17a of the first claw member 4a receives the force of the elastic member 15a also becomes a position that is offset to the other side in the circumferential direction compared to the position (elastic member load application points 25b, 25c) at which the claw portions 17b, 17c of the second and third claw members 4b, 4c receive the force of the elastic members 15b, 15c when viewed from the center axis O (refer to Figure 2 (a)~ Figure 2 In other words, the positions 25a to 25c are points where the forces of the elastic members 15a to 15c act.

[0067] With this configuration, the distance between the elastic member load application point 25a of the first claw member 4a and the rotation center 18a of the first claw member 4a (= the center 18a of the circular portion 16a of the first claw member 4a), more specifically, the circumferential distance D1 when viewed from the axial side, is larger than the distance D2 between the elastic member load application point 25b of the second claw member 4b and the rotation center 18b of the second claw member 4b, and the distance D3 between the elastic member load application point 25c of the third claw member 4c and the rotation center 18c of the third claw member 4c (D1>D2, D3). In addition, the distance D2 is the same as the distance D3 (D2=D3). The configuration of the first to third claw members 4a~4c and the first to third claw member retaining portions 12a~12c is referred to as the "second configuration".

[0068] In addition, in this embodiment, elastic members having the same acting force (load) are used as the elastic members 15a to 15c of the first to third claw member holding portions 12a to 12c.

[0069] As described above, the interval D1 between the elastic member load application point 25a of the first claw member 4a and the rotation center 18a is larger than the interval D2 between the elastic member load application point 25b of the second claw member 4b and the rotation center 18b, and the interval D3 between the elastic member load application point 25c of the third claw member 4c and the rotation center 18c, so that the action of the elastic member 15a in the moment causing the rotation action of the first claw member 4a is larger than that of the second and third claw members 4b and 4c. That is, the first claw member 4a is easier to rotate than the second and third claw members 4b and 4c.

[0070] Through the above-mentioned second structure, when the inner ring 3 rotates in the clockwise direction and the respective claws 17a to 17c of the first to third claw members 4a to 4c fall to the bottom surface 7 of the inner ring 3 and engage with the tooth portion 5, the falling speed of each claw 17a to 17c toward the bottom surface 7 can be greater in the first claw member 4a than in the second and third claw members 4b and 4c.

[0071] That is, when the inner ring 3 rotates in the clockwise direction, the claw 17a of the first claw member 4a can be made to fall, that is, reach the bottom surface 7 of the inner ring 3 faster than the second and third claw members 4b and 4c, and the claw 17a of the first claw member 4a can be more reliably first engaged with the tooth portion 5. Furthermore, after the first claw member 4a, the claws 17b and 17c of the second and third claw members 4b and 4c can be made to fall, that is, reach the bottom surface 7 of the inner ring 3 and engage with the tooth portion 5.

[0072] Therefore, the one-way clutch 1 can more reliably achieve the effect brought about by the first structure of the above-mentioned first to third pawl member holding portions 12 a to 12 c.

[0073] According to the present embodiment, it is possible to realize the one-way clutch 1 in which all of the first to third pawl members 4 a to 4 c can be stably engaged with the teeth 5 and the maximum transmittable torque can be ensured without risk of damage.

[0074] In the above-mentioned embodiment, the one-way clutch 1, 30 having three claw members (first to third claw members 4a to 4c) and three claw member retaining portions (first to third claw member retaining portions 12a to 12c) is shown, but the number of claw members and claw member retaining portions is not limited thereto.

[0075] For example, when the number of claw members and claw member retaining portions is set to n, when viewed from the center axis O of the outer ring 2, the second to n-th claw member retaining portions can be respectively arranged at positions offset by an arbitrary angle from the position where the inner circumferential surface of the outer ring 2 is divided into n equal parts in the circumferential direction based on the first claw member retaining portion. More specifically, the second to n-th claw member retaining portions can be arranged on the inner circumferential surface of the outer ring 2 in a manner that satisfies the following conditional expression (1). In addition, arbitrary angles α1 to α n－1 .

[0076] (1) A = (360 / n) × (m-1) + α m－1

[0077] in,

[0078] A: Angle between the arc on the inner circumferential surface of the outer ring 2 from the position of the first claw member holding portion to the positions of the second to n-th claw member holding portions and the central axis O of the outer ring 2 (unit: degree)

[0079] n: the number of the first to nth claw member holding portions (n ​​is an integer of n ≥ 2)

[0080] m: The order of the second to n-th claw member holding parts, counting from the first claw member holding part as the first one (m is an integer)

[0081] α m－1 : Arbitrary angle of the 2nd to nth claw member holding parts (unit: degree)

[0082] In the above embodiment, a one-way clutch 1 is shown which uses the inner ring 3 as the input side and the outer ring 2 as the output side to transmit torque from the inner ring 3 to the outer ring 2, but the present invention is not limited to this and can also be applied to a one-way clutch which uses the outer ring as the input side and the inner ring as the output side to transmit torque from the outer ring to the inner ring.

[0083] In addition, in the above-mentioned embodiment, the one-way clutch 1 is shown in which the clockwise rotation of the inner ring 3 is transmitted to the outer ring 2 by engaging the first to third claw members 4a to 4c with the wall surface 6 on one circumferential side of the tooth portion 5 of the inner ring 3. However, the present invention is not limited to this, and can also be applied to a so-called torque transmission direction switching type ratchet type one-way clutch that also has a plurality of claw members that can engage with the wall surface on the other circumferential side of the tooth portion 5 and can selectively switch between the state of transmitting the clockwise rotation of the inner ring 3 to the outer ring 2 and the state of transmitting the counterclockwise rotation of the inner ring 3 to the outer ring 2 by switching the plurality of claw members and the first to third claw members 4a to 4c.

Claims

1. A ratchet-type one-way clutch, characterized in that: have: Cylindrical outer ring; a cylindrical inner ring arranged radially inward of the outer ring so as to be rotatable relative to the outer ring; and first to n-th claw members, the first to n-th claw members are arranged on the inner circumference side of the outer ring in a manner that allows rotation in the radial direction, and n is an integer of n≥2, A plurality of teeth that can be engaged with the first to n-th claw members are formed on the outer peripheral surface of the inner ring. The inner peripheral surface of the outer ring is formed with first to n-th claw member holding portions for holding the first to n-th claw members. The first to n-th claw member holding portions are provided with urging members for urging the first to n-th claw members toward the inner ring side. When viewed from the central axis of the outer ring, the second to n-th claw member holding portions are arranged at positions offset by an arbitrary angle from a position where the inner peripheral surface of the outer ring is divided into n equal parts in the circumferential direction based on the position of the first claw member holding portion. When viewed from one side in the axial direction, the first to nth claw members include circular portions. When viewed from one side in the axial direction, the first to n-th claw member holding portions include a circular first recessed portion recessed from the inner peripheral surface of the outer ring toward the radially outer side, The circular portions of the first to n-th claw members are rotatably held in the first recessed portions of the first to n-th claw member holding portions, The urging member is disposed between the first to n-th claw members and the first to n-th claw member holding portions, The distance between the rotation center of the first claw member and the point of action of the force of the biasing member of the first claw member holding portion on the first claw member is larger than the distance between the rotation center of the second to nth claw members and the point of action of the force of the biasing member of the second to nth claw member holding portion on the second to nth claw members.

2. The ratchet one-way clutch according to claim 1, characterized in that: When viewed from one side in the axial direction, each of the first to nth claw members includes the circular portion and a rectangular claw portion provided integrally with the circular portion. When viewed from one side in the axial direction, each of the first to nth claw member retaining portions comprises: the first recess; and a rectangular second recess, the second recess being adjacent to the first recess in the circumferential direction and formed integrally therewith and recessed from the inner circumferential surface of the outer ring toward the radially outer side, The claw portions and the urging members of the first to n-th claw members are disposed one by one in the second recessed portions of the first to n-th claw member holding portions.

Images