Ratchet type one-way clutch

Abstract

To provide a ratchet type one-way clutch in which all pawl members are engageable with tooth portions stably.SOLUTION: A ratchet type one-way clutch 1 comprises an outer race 2, an inner race 3, and first to n-th pawl members 4a-4c. Multiple tooth portions 5 are formed on an outer circumferential surface of the inner race 3, and engageable with the first to n-th pawl members 4a-4c. First to n-th pawl member holding portions 12a-12c are formed on an inner circumferential surface of the outer race 2 for holding the first to n-th pawl members 4a-4c. Biasing members 15a-15c are held in the first to n-th pawl member holding portions 12a-12c for urging the first to n-th pawl members 4a-4c. The second to n-th pawl member holding portions 12b, 12c are provided at positions deviated by arbitrary angles from positions where the inner circumferential surface of the outer race 2 is divided into n equal parts in a circumferential direction with reference to a position of the first pawl member holding portion 12a, viewed from a central axis O.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ratchet type one-way clutch used as a torque transmission means or a backstop in vehicles, industrial machines, etc. [Background technology]

[0002] Conventionally, there has been known a ratchet-type one-way clutch equipped with a ratchet mechanism consisting of 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). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Application No. 2000-17658 Summary of the Invention [Problem to be solved by the invention]

[0004] In designing a ratchet-type one-way clutch, in order to maximize the torque that can be transmitted between the inner and outer rings, it is common for multiple pawl members to simultaneously engage multiple teeth, with each pawl member sharing the torque load.

[0005] However, in reality, due to manufacturing errors of each component of the ratchet type one-way clutch, i.e., the outer ring, the inner ring, and the pawl members, it is unlikely that the multiple pawl members will receive the torque load evenly when transmitting torque between the inner ring and the outer ring. In detail, one of the pawl members first engages with the teeth, and as the torque increases, each component elastically deforms, and the other pawl members begin to engage with the teeth. In addition, which pawl member receives the torque load first is random, so there is a possibility that a pawl member cannot engage with the teeth due to manufacturing errors of each component and the position of the pawl member that receives the torque load first. This may result in the ratchet type one-way clutch having a smaller torque capacity than expected, and may even be damaged.

[0006] SUMMARY OF THE PRESENT DISCLOSURE ... The present invention has been made in consideration of the above problems, and has an object to provide a ratchet type one-way clutch in which all of the pawl members can stably engage with the teeth portions. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: A cylindrical outer ring; a cylindrical inner ring arranged radially inward of the outer ring so as to be relatively rotatable; and first to nth claw members arranged on an inner peripheral side of the outer ring so as to be rotatable in a radial direction, a plurality of teeth portions with which the first to nth claw members can be engaged are formed on an outer circumferential surface of the inner ring, The inner circumferential surface of the outer ring is formed with first to nth claw member holding portions for holding the first to nth claw members, the first to nth claw member holding portions are provided with biasing members that bias the first to nth claw members toward the inner ring, The present invention provides a ratchet type one-way clutch, characterized in that the second to nth pawl member retaining portions are provided at positions shifted by an arbitrary angle from a position that divides the inner surface of the outer ring into n equal parts in the circumferential direction, based on the position of the first pawl member retaining portion, when viewed from the central axis of the outer ring. Effect of the Invention

[0008] According to the present invention, it is possible to provide a ratchet type one-way clutch in which all of the pawl members can stably engage with the teeth portions. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a cross section perpendicular to the axial direction of a ratchet type one-way clutch according to an embodiment of the present invention, as viewed from one axial side. [Diagram 2] 2(a) to 2(c) are partial enlarged views showing configurations of the first to third pawl members and the first to third pawl member holding portions in the ratchet type one-way clutch according to the embodiment of the present invention shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 accompanying drawings.

[0011] First, the directions of the one-way clutch 1 according to the embodiment shown in FIG. 1 are defined. The axial direction, radial direction, and circumferential direction of the one-way clutch 1 refer to the axial direction, radial direction, and circumferential direction with respect 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). In the axial direction, the front side of the paper in FIG. 1 is one axial side, and the rear side of the paper is the other axial side. In the circumferential direction, the clockwise rotation direction with respect to the paper in FIG. 1 is one circumferential side (also called the clockwise direction), and the counterclockwise rotation direction with respect to the paper in FIG. 1 is the other circumferential side (also called the counterclockwise direction). Note that the rotation of the one-way clutch 1 will be described in terms of the rotation of the outer ring 2 with respect to the inner ring 3, but the rotation of the outer ring 2 and the rotation of the inner ring 3 are relative to each other.

[0012] As shown in Fig. 1, one-way clutch 1 comprises a cylindrical outer ring 2, a cylindrical inner ring 3 that is rotatable relative to the outer ring 2, and a torque transmission mechanism that transmits torque from the outer ring 2 to the inner ring 3. The torque transmission mechanism of one-way clutch 1 employs a ratchet mechanism including first to third pawl members 4a to 4c provided on the inner periphery of the outer ring 2.

[0013] The inner ring 3 is spaced radially inward 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 that protrude radially outward and extend in the axial direction are provided at equal intervals in the circumferential direction around the entire circumference of the outer peripheral surface. The teeth 5 have a trapezoidal cross section as viewed from one axial side, and constitute ratchet teeth with which the first to third pawl members 4a to 4c mesh. In detail, the first to third pawl members 4a to 4c mesh with a 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 a bottom surface 7, and the first to third pawl members 4a to 4c entering between the teeth 5 is also referred to as dropping to the bottom surface 7.

[0014] The inner peripheral surface of the inner ring 3 defines a shaft hole 8. A shaft 9 that is concentric with the inner ring 3 is fitted into the shaft hole 8, and the inner ring 3 and the shaft 9 can rotate together. The shaft 9 is connected to, for example, a driven device (not shown). The shaft 9 and the shaft hole 8 may be fitted together using a spline.

[0015] A plurality of protrusions 11 that protrude radially outward and extend in the axial direction are provided along the circumferential direction on the outer peripheral surface of the outer ring 2. Each of the protrusions 11 has a trapezoidal cross section as viewed from one axial side, and is fitted with, for example, a shaft (not shown) that is connected to a drive device (not shown) via a gear mechanism (not shown). First, second and third claw member holding portions 12a to 12c are formed on the inner periphery of the outer ring 2 at approximately equal intervals in the circumferential direction and extend in the axial direction (see Figs. 2(a) to 2(c)). The first, second and third claw member holding portions 12a to 12c hold the first, second and third claw members 4a to 4c described above.

[0016] The first claw member retaining portion 12a is a recess that opens radially inward on the inner circumferential surface of the outer ring 2. The first claw member retaining portion 12a is composed of a first recess 13a, a second recess 14a formed integrally with and adjacent to the other circumferential side of the first recess 13a, and a third recess 22a formed integrally with and adjacent to the first recess 13b on one circumferential side. The first recess 13a of the first claw member holding portion 12a has a circular shape recessed from the inner surface of the outer ring 2 toward one circumferential side and radially outward when viewed from one axial side, and is a part that holds the first claw member 4a in a swingable manner.

[0017] The second recess 14a of the first claw member holding portion 12a has a rectangular shape recessed from the inner peripheral surface of the outer ring 2 toward the other circumferential side and radially outward when viewed from one axial side. A recess (not shown) recessed radially outward is further formed in the bottom surface of the second recess 14a, and an elastic member 15a is installed in this recess as a biasing member for biasing the first claw member 4a toward the inner ring 3. The bottom surface of the recess in which the elastic member 15a is installed is referred to as the installation surface of the elastic member 15a.

[0018] The third recess 22a of the first claw member holding portion 12a has a sector shape that widens and extends from the first recess 13a toward one circumferential side and radially outward when viewed from one axial side. More specifically, the third recess 22a has a sector shape that is wider than a sector portion 23a of the first claw member 4a (described later) in order to accommodate the sector portion 23a in a swingable manner. The second and third claw member holding portions 12b, 12c have the same configuration as the first claw member holding portion 12a, and are made up of first recesses 13b, 13c, second recesses 14b, 14c, elastic members 15b, 15c, and third recesses 22b, 22c.

[0019] The first claw member 4a is made of a thin metal member that has a predetermined circumferential length and extends in the axial direction. When viewed from one axial side, the first claw member 4a is made of a circular portion 16a that is circular in shape, a rectangular claw portion 17a that is integral with the circular portion 16a and protrudes toward the other circumferential side, and an extension portion, more specifically, a sector portion 23a that is sector-shaped, that is integral with the circular portion 16a and protrudes toward one circumferential side. The circular portion 16a of the first claw member 4a is held in a first recess 13a of the first claw member holding portion 12a so as to be rotatable about a center 18a of the circular portion 16a as a rotation (swing) center (see FIG. 2(a)).

[0020] The claw portion 17a of the first claw member 4a is arranged in the second recess 14a of the first claw member holding portion 12a, and is constantly biased toward the inner ring 3 (radially inward) by an 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 toward the other circumferential side and toward the inner ring 3. The sector portion 23a of the first claw member 4a is arranged to be able to swing within the third recess 22a of the first claw member holding portion 12a. The sector portion 23a is designed to have a greater radial thickness than the claw portion 17a, and has a greater mass.

[0021] The second and third claw members 4b, 4c have the same configuration as the first claw member 4a, and are composed of circular portions 16b, 16c, claw portions 17b, 17c, and sector portions 23b, 23c. The sector portions 23b, 23c are narrower in width than the sector portion 23a, i.e., are designed to have a smaller thickness in the radial direction, and have a smaller mass.

[0022] The ratchet mechanism of the one-way clutch 1 is constituted by the tooth portion 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.

[0023] In the one-way clutch 1 configured as described above, when the outer ring 2 rotates counterclockwise together with a shaft (not shown) driven by a drive unit (not shown), the relative rotation of the outer ring 2 with respect to the inner ring 3 is fixed, and the inner ring 3 and the shaft 9 fitted to the inner ring 3 rotate integrally together with the outer ring 2. On the other hand, when the outer ring 2 rotates clockwise, the outer ring 2 rotates freely with respect to the inner ring 3.

[0024] Specifically, when the outer ring 2 rotates counterclockwise, the first to third claw members 4a to 4c of the outer ring 2 each mesh with the toothed portion 5 of the inner ring 3. Specifically, the tips 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 circumferential side of the toothed portion 5. In this manner, the wall surface 6 on one circumferential side of the toothed portion 5 constitutes the meshing surface of the toothed portion 5 that meshes with the first to third claw members 4a to 4c. As the first to third claw members 4a to 4c mesh with the toothed portion 5, the outer ring 2 and the inner ring 3 rotate together, and torque is transmitted from the outer ring 2 to the inner ring 3. When the inner ring 3 is fixed, the one-way clutch 1 functions as a backstop that prevents the outer ring 2 from rotating counterclockwise.

[0025] On the other hand, when the outer ring 2 rotates clockwise, 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 push the claw portions 17a to 17c of the first to third claw members 4a to 4c radially outward against the biasing force of the elastic members 15a to 15c while the outer ring 2 rotates. In other words, the outer ring 2 rotates freely relative to the inner ring 3, and no torque is transmitted from the outer ring 2 to the inner ring 3.

[0026] In the one-way clutch 1 according to this embodiment, when the first to third pawl members 4a to 4c engage with the tooth portion 5, the claw portions 17a to 17c of the first to third pawl members 4a to 4c are not repelled in the non-engagement direction, i.e., radially outward by the engagement surface 6 of the tooth portion 5 and do not ride up onto the tooth portion 5, so that the first to third pawl members 4a to 4c can reliably engage with the tooth portion 5. The configuration of the ratchet mechanism in this embodiment that provides such an effect will be described in detail below.

[0027] In this embodiment, the second and third claw member holding portions 12b, 12c are respectively provided at positions shifted by arbitrary angles α1 and α2 degrees from a position that divides the inner surface of the outer ring 2 into thirds in the circumferential direction when viewed from the central axis O of the outer ring 2.

[0028] Specifically, the second claw member holding portion 12b is provided on the inner peripheral surface of the outer ring 2 such that the center 21b of the first recess 13b of the second claw member holding portion 12b is located at a position shifted by an arbitrary angle α1 degree to one side in the circumferential direction (clockwise direction) from a position that divides the inner peripheral surface of the outer ring 2 into three equal parts in the circumferential direction as viewed from the central axis O, based on the center 21a (= rotation center of the first claw member 4a) of the first recess 13a of the first claw member holding portion 12a. That is, the angle in the clockwise direction between 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 with the central axis O as the center is 120+α1 degrees. In addition, it is desirable to set the arbitrary angle α1 taking into consideration the amount of deformation when each component of the one-way clutch 1, i.e., the outer ring 2, the inner ring 3, and the first to third pawl members 4a to 4c, elastically deforms under a torque load and the installation play during assembly.

[0029] On the inner peripheral surface of the outer ring 2, the third pawl member holding portion 12c is provided such that the center 21c of the first recess 13a of the third pawl member holding portion 12c is located at a position shifted clockwise by an arbitrary angle α2 degrees from another position that divides the inner peripheral surface of the outer ring 2 into three equal parts in the circumferential direction as viewed from the central axis O, with the center 21a of the first recess 13a of the first pawl member holding portion 12a as a reference. That is, the angle formed in the clockwise direction between the center 21a of the first recess 13a of the first pawl member holding portion 12a and the center 21c of the first recess 13c of the third pawl member holding portion 12c with the central axis O as the center is 240 + α2 degrees. Note that, like the arbitrary angle α1 described above, the arbitrary angle α2 is desirably set in consideration of the amount of deformation when each component of the one-way clutch 1 elastically deforms under a torque load and the installation backlash during assembly, and may be α2 = α1. The above-described configuration of the first to third hook member holding portions 12a to 12c will be referred to as a "first configuration."

[0030] In the first configuration described above, when the outer ring 2 rotates counterclockwise, the claw portion 17a of the first claw member 4a of the outer ring 2 first drops onto the bottom surface 7 of the inner ring 3 and engages with the meshing surface 6 of the tooth portion 5.

[0031] At this time, the claw portion 17b of the second claw member 4b falls onto the bottom surface 7 of the inner ring 3. As described above, the position of the second claw member holding portion 12b on the inner peripheral surface of the outer ring 2 is shifted by an arbitrary angle α1 degree in the circumferential direction from the position dividing the inner peripheral surface of the outer ring 2 into three equal parts in the circumferential direction, so that a gap is created in the circumferential direction between the tip of the claw portion 17b of the second claw member 4b, specifically, the end face on the other circumferential side (counterclockwise side), and the meshing surface 6 of the toothed portion 5. Therefore, the claw portion 17b of the second claw member 4b can fall onto the bottom surface 7 of the inner ring 3 without climbing up onto the toothed portion 5. Then, when the outer ring 2 rotates in the counterclockwise direction, or due to elastic deformation or installation play of each component due to a torque load, the gap between the claw portion 17b of the second claw member 4b and the toothed portion 5 disappears, and the claw portion 17b of the second claw member 4b can engage with the meshing surface 6 of the toothed portion 5. It should be noted that 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 outer ring 2 rotates counterclockwise.

[0032] As described above, when the outer ring 2 rotates counterclockwise, the claw portions 17a-17c of the first to third claw members 4a-4c can reliably engage with the tooth portion 5. Therefore, the first to third claw members 4a-4c can share and bear the torque load in torque transmission from the outer ring 2 to the inner ring 3. Therefore, the one-way clutch 1 can maximize the torque that can be transmitted between the inner ring 3 and the outer ring 2. In addition, since it is possible to eliminate the occurrence of a claw member that cannot engage with the tooth portion 5, it is possible to prevent the torque capacity of the one-way clutch 1 from decreasing, and thus the one-way clutch 1 from being damaged. In addition, since it is not necessary to increase the number of claw members to ensure the safety of the one-way clutch 1, it is also possible to suppress the expansion of the diameter of the one-way clutch 1.

[0033] In this embodiment, the sector portion 23a of the first claw member 4a has a larger radial thickness and a larger mass than the sector portions 23b, 23c of the second and third claw members 4b, 4c as described above. Therefore, as shown in Fig. 2(a) to Fig. 2(c), the distance C1 between the center of gravity 24a of the first claw member 4a and the rotation center 18a of the first claw member 4a (= the center 21a of the first recessed portion 13a of the first claw member holding portion 12a) is larger than the distance C2 between the center of gravity 24b of the second claw member 4b and the rotation center 18b of the second claw member 4b (= the center 21b of the first recessed portion 13b of the second claw member holding portion 12b), and the distance C3 between the center of gravity 24c of the third claw member 4c and the rotation center 18c of the third claw member 4c (= the center 21c of the first recessed portion 13c of the third claw member holding portion 12c) (C1>C2, C3). The distance C2 and the distance C3 are the same (C2=C3). Such a configuration of the first to third claw members 4a to 4c is referred to as a "second configuration." In this embodiment, elastic members 15a to 15c having the same biasing force are used for the first to third claw member holding portions 12a to 12c.

[0034] According to the second configuration, the first claw member 4a is more likely to rotate in the first recess 13a of the first claw member holding portion 12a because the distance C1 between the center of gravity 24a and the rotation center 18a is greater than those of the second and third claw members 4b and 4c. Therefore, when the outer ring 2 rotates counterclockwise and each of the claw portions 17a to 17c of the first to third claw members 4a to 4c falls to the bottom surface 7 of the inner ring 3 and engages with the tooth portion 5, the falling speed of each of the claw portions 17a to 17c to the bottom surface 7 can be made faster for the first claw member 4a than for the second and third claw members 4b, 4c. That is, when the outer ring 2 rotates counterclockwise, the claw portion 17a of the first claw member 4a can be dropped onto the bottom surface 7 of the inner ring 3 more quickly than the second and third claw members 4b, 4c, and the claw portion 17a of the first claw member 4a can be more reliably engaged with the teeth portion 5 first. Then, following the first claw member 4a, the claw portions 17b, 17c of the second and third claw members 4b, 4c can be dropped onto the bottom surface 7 of the inner ring 3 and engaged with the teeth portion 5. Therefore, the one-way clutch 1 can more reliably achieve the effect provided by the first configuration of the first to third pawl member holding portions 12a to 12c described above.

[0035] In this embodiment, the first to third claw members 4a to 4c include the claw portions 17a to 17c as described above, and the sector portions 23a to 23c on the opposite side of the claw portions 17a to 17c, which have a radial thickness greater than that of the claw portions 17a to 17c and a circumferential length substantially equal to that of the claw portions 17a to 17c. Therefore, the mass of the sector portions 23a to 23c of the first to third claw members 4a to 4c is greater than that of the claw portions 17a to 17c. Also, the centers of gravity 24a to 24c of the claw portions 17a to 17c are located closer to the sector portions 23a to 23c, i.e., on one circumferential side, than the centers 18a to 18c of the circular portions 16a to 16c (rotation centers of the first to third claw members 4a to 4c) (see Figs. 2(a) to 2(c)). Such a configuration of the first to third claw members 4a to 4c is referred to as a "third configuration."

[0036] According to the third configuration, the sector portions 23a-23c of the first to third claw members 4a-4c have a greater mass than the claw portions 17a-17c, and therefore, when the outer ring 2 rotates, the sector portions 23a-23c are more affected by centrifugal force than the claw portions 17a-17c, and the first to third claw members 4a-4c are subjected to a force rotating them in the counterclockwise direction. And, because the sector portion 23a of the first claw member 4a has a greater mass than the sector portions 23b, 23c of the second and third claw members 4b, 4c, the first claw member 4a is subjected to this force more than the second and third claw members 4b, 4c.

[0037] As described above, when the outer ring 2 rotates, the first claw member 4a has a larger mass and centrifugal force than the second and third claw members 4b and 4c of the moment that causes the first claw member 4a to rotate. That is, when the outer ring 2 rotates, the first claw member 4a rotates more easily than the second and third claw members 4b and 4c. Therefore, according to the third configuration, the same effect as the second configuration can be achieved, and the one-way clutch 1 can more reliably achieve the effect provided by the first configuration of the first to third pawl member holding portions 12a to 12c described above.

[0038] According to this embodiment, it is possible to realize a one-way clutch 1 in which all of the first to third pawl members 4a to 4c can be stably engaged with the tooth portion 5 and which is free from the risk of damage while ensuring a maximum amount of transmittable torque. The shapes of the first to third claw members 4a to 4c are not limited to those described above, and may be any shape that can achieve the effects of the second configuration.

[0039] In the above embodiment, a one-way clutch 1 is shown having three claw members (first to third claw member 4a to 4c) and three claw member holding portions (first to third claw member holding portions 12a to 12c), but the number of claw members and claw member holding portions is not limited to this.

[0040] For example, when the number of claw members and claw member retaining portions is n, the second to nth claw member retaining portions may be provided at positions shifted by an arbitrary angle from a position that divides the inner peripheral surface of the outer ring 2 into n equal parts in the circumferential direction, as viewed from the central axis O of the outer ring 2, with the first claw member retaining portion as a reference. More specifically, the second to nth claw member retaining portions may be provided on the inner peripheral surface of the outer ring 2 so as to satisfy the following conditional formula (1). Note that the second to nth claw member retaining portions may be shifted by arbitrary angles α1 to α n-1 are set respectively.

[0041] (1) A = (360 / n) × (m-1) + α m-1 however, A: Angle (unit: degree) between the central axis O of the outer ring 2 and the arc from the position of the first jaw member holding portion to the positions of the second to nth jaw member holding portions on the inner peripheral surface of the outer ring 2 n: number of 1st to nth claw member holding parts m: the order of the second to nth claw member holders counted from the first claw member holder, with the first claw member holder being the first α m-1 : Arbitrary angle of the 2nd to nth jaw member holding parts (unit: degree)

[0042] Also, in the above embodiment, the one-way clutch 1 is shown in which the first to third pawl members 4a to 4c engage with the wall surface 6 on one circumferential side of the teeth portion 5 of the inner ring 3, thereby transmitting the counterclockwise rotation of the outer ring 2 to 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 ratchet type one-way clutch which further has a plurality of pawl members engageable with the wall surface on the other circumferential side of the teeth portion 5, and which can selectively switch between a state in which the counterclockwise rotation of the outer ring 2 is transmitted to the inner ring 3 and a state in which the clockwise rotation of the outer ring 2 is transmitted to the inner ring 3 by switching between the plurality of pawl members and the first to third pawl members 4a to 4c. [Explanation of symbols]

[0043] 1 One-way clutch 2 Outer ring 3. Inner Circle 4a~4c 1st~3rd claw member 5 Inner ring teeth 6 Teeth wall surface (engagement surface) 12a~12c 1st~3rd claw member holding part 13a to 13c: First recesses of first to third claw member holding portions 14a to 14c: second recesses of first to third claw member holding portions 15a to 15c: Elastic members for first to third claw member holding portions 16a to 16c: Circular portions of the first to third claw members 17a to 17c Claw portions of first to third claw members 18a to 18c: Centers of the circular portions of the first to third claw members 21a to 21c: Centers of the first recesses of the first to third claw member holding portions 22a to 22c: Third recesses of the first to third claw member holding portions 23a to 23c: Sector portions of the first to third claw members O Center axis of inner and outer rings

Claims

1. A cylindrical outer ring; a cylindrical inner ring arranged radially inward of the outer ring so as to be relatively rotatable; First to n-th claw members are arranged on the inner peripheral side of the outer ring so as to be rotatable in the radial direction, a plurality of teeth portions with which the first to nth pawl members can be engaged are formed on an outer circumferential surface of the inner ring, First to nth claw member holding portions for holding the first to nth claw members are formed on an inner peripheral surface of the outer ring, The first to nth claw member holding portions are provided with biasing members that bias the first to nth claw members toward the inner ring, a ratchet type one-way clutch, characterized in that the second to nth pawl member retaining portions are provided at positions shifted by an arbitrary angle from a position that divides the inner surface of the outer ring into n equal parts in the circumferential direction, based on the position of the first pawl member retaining portion, as viewed from the central axis of the outer ring.

2. When viewed from one axial side, each of the first to nth claw members has a circular portion having a circular shape, a claw portion integrally provided on the circular portion and protruding in a circumferential direction, and an extension portion integrally provided on the circular portion and protruding to an opposite side from the claw portion, When viewed from one axial side, the first to nth claw member holding portions each have a circular first recess portion recessed radially outward from an inner circumferential surface of the outer ring, a second recess portion integrally formed adjacent to the first recess portion in the circumferential direction and recessed radially outward from the inner circumferential surface of the outer ring, and a third recess portion integrally formed adjacent to the first recess portion on an opposite side to the second recess portion, the circular portions of the first to nth claw members are rotatably held in the first recesses of the first to nth claw member holding portions, the claw portions and the biasing members of the first to nth claw members are disposed in the second recesses of the first to nth claw member holding portions, the extension portions of the first to nth claw members are disposed in the third recesses of the first to nth claw member holding portions, the centers of gravity of the first to nth claw members are located closer to the extension portion in the circumferential direction than the rotation centers of the first to nth claw members, The ratchet type one-way clutch according to claim 1, characterized in that the distance between the center of gravity of the first pawl member and the center of rotation of the first pawl member is greater than the distance between the centers of gravity of the second to nth pawl members and the centers of rotation of the second to nth pawl members.

3. The extension portions of the first to nth claw members have a larger mass than the claw portions of the first to nth claw members, 3. The ratchet type one-way clutch according to claim 2, wherein the extension portion of the first pawl member has a greater mass than the extension portions of the second to n-th pawl members.

4. The claw portions of the first to nth claw members are rectangular when viewed from one axial side, The extension portions of the first to nth claw members are fan-shaped when viewed from one axial side, the second recesses of the first to nth claw member holding portions have a rectangular shape recessed radially outward from an inner circumferential surface of the outer ring when viewed from one axial side, The third recesses of the first to nth claw member holding portions have a sector shape that extends while widening in width toward a side opposite to the second recesses in the circumferential direction and toward a radially outward direction when viewed from one axial side, 4. The ratchet type one-way clutch according to claim 3, wherein the extension portions of the second to nth pawl members are fan-shaped and narrower than the first extension portion when viewed from one axial side.

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