One pair of biasing member, ratchet type clutch using the same, and assembly method of ratchet type clutch

Abstract

To provide a ratchet type clutch capable of biasing claw members stably.SOLUTION: A ratchet type clutch 1 has: an inner ring 5; an outer ring 3 disposed coaxially with the inner ring 5 so as to be rotatable relative to the inner ring 5; a first claw member 11 which may lock relative rotation of the inner ring 5 relative to the outer ring 3 in a first rotation direction; a second claw member 12 which may lock relative rotation of the inner ring 5 relative to the outer ring 3 in a second rotation direction; and a retainer 7 which retains the first claw member 11 and the second claw member 12 and is fixed to the outer ring 3; and a first spring 9a configured to bias the first claw member 11 in a radial direction and a second spring 9b configured to bias the second claw member 12 in the radial direction. The first spring 9a and the second spring 9b are a pair of springs 9 which are integrally formed and arranged parallel to each other.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a pair of biasing members, a ratchet type clutch using the pair of biasing members, and an assembling method of the ratchet type clutch.

Background Art

[0002] There is a clutch using a ratchet mechanism that can switch the torque transmission direction by switching between a state of locking only rotation in one or the other of the rotational directions of the inner ring member with respect to the outer ring member or the outer ring member with respect to the inner ring member, a state of simultaneously locking rotation in both the one and the other rotational directions, and a state of not locking rotation in either the one or the other rotational direction.

[0003] The clutch using the above-described ratchet mechanism is used as a torque transmission device in vehicles, industrial machines, and the like. The ratchet type clutches disclosed in Patent Documents 1 and 2 have a configuration in which a plurality of pairs of claw members are held on the outer ring via a retainer, and each claw member is biased toward the inner ring by each coil-shaped spring.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the configurations disclosed in Patent Documents 1 and 2, the position of the spring with respect to the long axis direction of the spring is not considered. Therefore, due to the position of the end portion of the coiled portion of the spring, variations occur in the seating posture of the spring, and the biasing force of the spring on the claw member becomes partially unstable, which may cause damage to the spring or hinder the operation of the clutch. Further, the spring is installed by inserting a single spring into a spring receiving recess provided in the retainer, but it is necessary to bend the spring between the claw member and the retainer for installation, and the assemblability is not good.

[0006] An object of the present invention is to provide a ratchet type clutch capable of stably biasing a claw member.

Means for Solving the Problems

[0007] In order to achieve the above object, the present invention provides a ratchet type clutch including a first annular member, a second annular member disposed coaxially and rotatably relative to the first annular member, a first claw member capable of locking relative rotation of the first annular member in a first rotation direction with respect to the second annular member, a second claw member capable of locking relative rotation of the first annular member in a second rotation direction with respect to the second annular member, a holding member that holds the first claw member and the second claw member and is fixed to the second annular member, a first biasing member that biases the first claw member in the radial direction, and a second biasing member that biases the second claw member in the radial direction, wherein the first biasing member and the second biasing member are a pair of biasing members integrally configured in parallel.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a ratchet type clutch capable of stably biasing a claw member.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0010] Hereinafter, the torque transmission direction switching type ratchet type clutch 1 according to the embodiment of the present invention will be described with reference to the drawings. The torque transmission direction switching type ratchet type clutch 1 according to the embodiment will be described as an example used as a component of a vehicle transmission.

[0011] First, the directions in the ratchet type clutch 1 according to the embodiment are defined. In the embodiment, the "central axis C" refers to the central axis C of the ratchet type clutch 1, that is, the axis of the outer ring 3 (second annular member) and the inner ring 5 (first annular member), and the axial direction (X-axis direction), the radial direction (Z-axis direction), and the circumferential direction (Y-axis direction) refer to the axial direction, the radial direction, and the circumferential direction with respect to the central axis C. Also, regarding the axial direction, in FIG. 1, the direction toward the front of the paper surface is taken as one axial direction, and the direction toward the back of the paper surface is taken as the other axial direction. Regarding the circumferential direction, in FIG. 1, the direction of rotating clockwise toward the paper surface is taken as one circumferential direction, and the direction of rotating counterclockwise toward the paper surface is taken as the other circumferential direction.

[0012] Regarding the rotation direction of the ratchet-type clutch 1, for the sake of convenience of explanation, the rotation direction of the inner ring 5 with respect to the outer ring 3 will be described. However, the rotation of the outer ring 3 and the rotation of the inner ring 5 are relative. For example, when the inner ring 5 is rotatable clockwise, the outer ring 3 is also rotatable counterclockwise. Also, even when the inner ring 5 and the outer ring 3 rotate in the same direction, if the rotation speeds of the outer ring 3 and the inner ring 5 are different, it can be said that the outer ring 3 and the inner ring 5 rotate relative to each other in a certain direction.

[0013] FIG. 1 is a front view of the ratchet-type clutch 1 according to the embodiment as viewed from the axial direction. The plate member that controls the claw mechanism portion described later is not shown.

[0014] The ratchet-type clutch 1 according to the embodiment includes an annular outer ring 3, an annular inner ring 5 that is spaced radially inward from the outer ring 3, is coaxial with the central axis C of the outer ring 3, and is relatively rotatable with respect to the outer ring 3, an annular retainer 7 (holding member) positioned between the outer ring 3 and the inner ring 5, and a torque transmission mechanism that enables torque transmission between the outer ring 3 and the inner ring 5. The torque transmission mechanism in the embodiment is a ratchet mechanism.

[0015] The outer ring 3 is a cylindrical member having a predetermined length in the axial direction. A plurality of claw mechanism portions described later are held on the inner peripheral surface (inner peripheral portion) of the outer ring 3. A plurality of convex portions 3c that protrude radially outward and extend in the axial direction are provided at predetermined intervals in the circumferential direction on the outer peripheral surface (outer peripheral portion) of the outer ring 3. By fitting these convex portions 3c into the fitting portions of an outer member (not shown), the outer ring 3 is fixed so as not to be relatively rotatable with respect to the outer member.

[0016] As shown in FIG. 1, on the inner peripheral surface of the outer ring 3, a first claw member 11 and a second claw member 12 that is adjacent to one side in the circumferential direction of the first claw member 11 and forms a pair with the first claw member 11 are provided. The first claw member 11 and the second claw member 12 constitute a claw mechanism portion. That is, on the inner peripheral surface of the outer ring 3, as viewed from one axial side, a claw mechanism portion including the first claw member 11 and the second claw member 12 that are arranged in order and form a pair toward one side in the circumferential direction is provided. A plurality of such claw mechanism portions are provided on the outer ring 3 at predetermined intervals in the circumferential direction. The first claw member 11 has a cylindrical portion 11c extending in the direction of the central axis C, a protruding portion 11a extending from the cylindrical portion 11c toward the other side in the circumferential direction, and a claw portion 11b extending toward one side in the circumferential direction. The second claw member 12 has a cylindrical portion 12c extending in the direction of the central axis C, a protruding portion 12a extending from the cylindrical portion 12c toward one side in the circumferential direction, and a claw portion 12b extending toward the other side in the circumferential direction.

[0017] The inner ring 5 is disposed radially inward of the outer ring 3. On the outer peripheral portion of the inner ring 5, a plurality of tooth portions are formed at equal intervals over the entire circumference. Each tooth portion protrudes radially outward and extends in the direction of the central axis C. The inner peripheral surface of the outer ring 3 and the outer peripheral portion (tooth portions) of the inner ring 5 face each other radially with a predetermined space therebetween. The tooth portions constitute ratchet teeth with which the first claw member 11 and the second claw member 12 engage. Specifically, on one side in the circumferential direction of each tooth portion, the side surface facing the claw portion 11b of the first claw member 11 constitutes a first engagement portion 5a (first engaging portion) that engages with the claw portion 11b. On the other hand, on the other side in the circumferential direction of each tooth portion, the side surface facing the claw portion 12b of the second claw member 12 constitutes a second engagement portion 5b (second engaging portion) that engages with the claw portion 12b. By the first claw member 11 engaging with the first engagement portion 5a, it is possible to lock the relative rotation of the inner ring 5 with respect to the outer ring 3 in the first rotational direction. Also, by the second claw member 12 engaging with the second engagement portion 5b, it is possible to lock the relative rotation of the inner ring 5 with respect to the outer ring 3 in the second rotational direction, and the inner ring 5 and the outer ring 3 can be engaged so as to be torque-transmittable.

[0018] On the inner peripheral surface of the inner ring 5, splines 5c are provided over the entire circumference, and a shaft member (not shown) for output or input is spline-fitted via the splines 5c.

[0019] In the embodiment, the first claw member 11 and the second claw member 12 are held by the outer ring 3 via the cage 7. The cage 7 can be formed, for example, by injection molding using a resin material.

[0020] The claw portion 11b and the protruding portion 11a of the first claw member 11 have the same circumferential length and radial thickness. The cylindrical portion 11c, the claw portion 11b, and the protruding portion 11a are integrally formed. The first claw member 11 is held by the cage 7 in a rotatable state about the cylindrical portion 11c as the rotation center. On the inner peripheral surface of the outer ring 3, a sliding portion 3a is provided for the protruding portion 11a of the first claw member 11 to slide in the radially inward direction, and the first claw member 11 is disposed at a position where the protruding portion 11a enters the sliding portion 3a. The first claw member 11 is urged radially inward by the first spring 9a (first urging member) of the pair of coil springs 9 (pair of urging members), and the protruding portion 11a is in sliding contact with the sliding portion 3a.

[0021] The claw portion 12b and the protruding portion 12a of the second claw member 12 have the same circumferential length and radial thickness. The cylindrical portion 12c, the claw portion 12b, and the protruding portion 12a are integrally formed. The second claw member 12 is held by the cage 7 in a rotatable state about the cylindrical portion 12c as the rotation center. On the inner peripheral surface of the outer ring 3, a sliding portion 3b is provided for the protruding portion 12a of the second claw member 12 to slide in the radially inward direction, and the second claw member 12 is disposed at a position where the protruding portion 12a enters the sliding portion 3b. The second claw member 12 is urged radially inward by the second spring 9b (second urging member) of the pair of coil springs 9, and the protruding portion 12a is in sliding contact with the sliding portion 3b.

[0022] In this way, a ratchet mechanism is constituted by the first claw member 11 and the second claw member 12 held on the inner peripheral surface of the outer ring 3, the pair of springs 9, and the tooth portion formed on the inner ring 5.

[0023] In the embodiment, the plurality of first claw members 11, the plurality of pairs of springs 9, and the plurality of second claw members 12 are held on the inner peripheral side of the outer ring 3 via the cage 7. Specifically, these plurality of first claw members 11 and second claw members 12 are held by an annular cage 7 fitted on the inner peripheral side of the outer ring 3. The cage 7 is disposed on the inner peripheral side of the outer ring 3.

[0024] FIG. 2(A) is an exploded perspective view of the ratchet type clutch 1 according to the embodiment. FIG. 2(B) is an exploded perspective view of the ratchet type clutch 1 with the cage 7 assembled to the inner ring 5. FIG. 2(C) is a perspective view of the ratchet type clutch 1 with the inner ring 5 and the cage 7 assembled to the outer ring 3. With reference to FIGS. 2(A) to (C), the outer ring 3, the configuration of the cage 7, and the assembling method of the ratchet type clutch 1 according to the embodiment will be described.

[0025] The inner peripheral surface of the outer ring 3 is formed in a shape corresponding to a plurality of spring fixing portions 7f provided on the outer peripheral portion of the cage 7, which will be described later, and a plurality of recesses 7g formed between the spring fixing portions 7f in the circumferential direction. Specifically, on the inner peripheral surface of the outer ring 3, radial recesses 3f corresponding to the spring fixing portions 7f and radial protrusions 3g corresponding to the recesses 7g are alternately formed in the circumferential direction. Further, on one end surface in the axial direction of the outer ring 3, an annular recess 3e with which the flange portion 7e of the cage 7 engages is formed.

[0026] The outer peripheral surface of the cage 7 is formed with a plurality of spring fixing portions 7f, accommodating portions 7h for accommodating the protruding portions 11a of the first claw members 11 on both sides in the circumferential direction of the spring fixing portions 7f, and accommodating portions 7i for accommodating the protruding portions 12a of the second claw members 12, which are alternately formed in the circumferential direction. A flange portion 7e is formed at one end in the axial direction of the cage 7. The cage 7 is an annular member coaxial with the outer ring 3.

[0027] Next, the steps of the assembling method of the ratchet type clutch 1 will be described. For the assembly of the ratchet type clutch 1, first, the protruding portion 11a of the first claw member 11 is accommodated in the accommodating portion 7h of the cage 7, and the protruding portion 12a of the second claw member 12 is accommodated in the accommodating portion 7i. The first claw member 11 and the second claw member 12 are inserted into the cage 7 from the axial direction respectively. Then, a pair of springs 9 are inserted into the spring fixing portion 7f on the outer peripheral surface of the cage 7 from the outside in the radial direction toward the inside in the radial direction. The pair of springs 9 are fixed to the cage 7 so that the first claw member 11 and the second claw member 12 are biased in the radial direction by the first spring 9a and the second spring 9b respectively.

[0028] Next, a plate member (not shown) is fixed to the side surface of the cage 7 from the axial direction to prevent the first claw member 11 and the second claw member 12 from falling off. Then, the cage 7 with the first claw member 11, the second claw member 12, the pair of springs 9 and the plate member assembled thereon is assembled to the outer ring 3. During the assembly, the circumferential positions of the cage 7 and the outer ring 3 are aligned so that the position of the spring fixing portion 7f of the cage 7 coincides with the position of the radial recess 3f of the outer ring 3, and the position of the recess 7g of the cage 7 coincides with the position of the radial protrusion 3g. Then, the assembly of the cage 7 is inserted into the outer ring 3 from the other axial side of the outer ring 3 toward one axial side, and the flange portion 7e of the cage 7 is engaged with the annular recess 3e on the end surface of the outer ring 3. By engaging the flange portion 7e with the annular recess 3e, the assembly of the cage 7 is positioned with respect to the outer ring 3. Then, the inner ring 5 is inserted inside the cage 7 assembled to the outer ring 3. The ratchet type clutch 1 can be assembled by the above procedure.

[0029] Next, a pair of springs 9 of the embodiment will be described. As shown in FIG. 3, the pair of springs 9 of the embodiment includes a first spring 9a and a second spring 9b integrally formed with the first spring 9a. The second spring 9b is arranged in parallel with the first spring 9a. The pair of springs 9 includes a first extending portion 91 extending in a first direction X1 substantially orthogonal to the biasing direction Z (Z-axis direction) from one end portion 9a1 (one end side) of the first spring 9a, a first curved portion 92 connected to the first extending portion 91 and curved in a diagonal + biasing direction Z (+Z-axis direction) with respect to the first direction X1, a second curved portion 93 connected to the first curved portion 92 and curved in a second direction Y (Y-axis direction) substantially orthogonal to the biasing direction Z, and a second extending portion 94 extending in the second direction Y from the second curved portion 93. Further, the pair of springs 9 includes a third curved portion 95 connected to the second extending portion 94 and curved in a direction substantially orthogonal to the second direction Y and also curved in a diagonal -Z-axis direction (-biasing direction Z), a fourth curved portion 96 connected to the third curved portion 95 and curved in a third direction X2, and a third extending portion 97 extending in the third direction X2 from the fourth curved portion 96. One end portion 9b1 of the second spring 9b is connected to the third extending portion 97. With such a configuration, the second extending portion 94 is located below the first extending portion 91 and the third extending portion 97 by a length z1 in the Z-axis direction.

[0030] The length y2 of the second extending portion 94 of the pair of springs 9 of the embodiment is shorter than the length y1 of the interval between the first spring 9a and the second spring 9b in the Y-axis direction. Note that either one of the first direction X1 or the third direction X2 may be a direction parallel to the X-axis direction, or both may have a predetermined angle with respect to the X-axis direction. Such a pair of springs 9 may be formed, for example, by winding the first spring 9a, then forming the first extending portion 91 from one end portion 9a1, and forming the first curved portion 92, the second curved portion 93, the second extending portion 94, the third curved portion 95, the fourth curved portion 96, and the third extending portion 97 from the first extending portion 91, and further forming the second spring 9b.

[0031] Also, a pair of springs 9 are configured such that the coiled portions 9a2 of the first spring 9a and the coiled portions 9b2 of the second spring 9b are substantially symmetrical. More specifically, the terminal ends 9a3 of the coiled portion 9a2 and the terminal ends 9b3 of the coiled portion 9b2 are arranged to be substantially line-symmetrical in the first spring 9a and the second spring 9b arranged in parallel. Further, although the winding directions of the first spring 9a and the second spring 9b are different from each other, they may be in the same direction. That is, by configuring the pair of springs 9 so that the first spring 9a and the second spring 9b are left-right symmetrical, the contact positions with respect to the first claw member 11 and the second claw member 12 become uniform, and the operation becomes more stable. Note that the number of turns of the first spring 9a and the number of turns of the second spring 9b are the same, and they are configured as biasing members with the same specifications, but they may also be biasing members with different specifications. Specifically, the number of turns of the first spring 9a and the number of turns of the second spring 9b are configured to be different, and the respective biasing forces are set to different specifications. Such biasing members with different specifications are used, for example, when any one of the claw members is actuated by centrifugal force due to the rotation of the ratchet-type clutch 1. Also, the pair of springs 9 are compression coil springs.

[0032] With reference to FIGS. 4(A) to (C), a method of fixing a pair of springs 9 will be described. FIG. 4(A) is a partial perspective view of the spring fixing portion 7f of the retainer 7, showing a state when a pair of springs 9 are assembled to the retainer 7. FIG. 4(B) is a partial perspective view of a state where a pair of springs 9 are assembled to the retainer 7. FIG. 4(C) is an enlarged perspective view when the retainer 7 with a pair of springs 9 assembled is inserted into the outer ring 3.

[0033] A pair of springs 9 are held by a cage 7. The cage 7 is an annular member having a constant width in the axial direction and includes a plurality of spring fixing portions 7f in the circumferential direction. The spring fixing portion 7f is composed of a first holding hole 7a (hole) penetrating in the radial direction, a second holding hole 7b (hole), two guide grooves 7c (positioning portions) for positioning the pair of springs 9, and a clamping portion 7d (fixing portion) for fixing the pair of springs 9. Since a plurality of pairs of the first claw member 11 and the second claw member 12 are provided in the circumferential direction as a pair of claw members, a plurality of pairs of the first holding hole 7a and the second holding hole 7b, which are a pair of holes, are provided along the circumferential direction of the cage 7 corresponding to the plurality of pairs of the first claw member 11 and the second claw member 12. A plurality of clamping portions 7d are also provided along the circumferential direction corresponding to the plurality of pairs. The first claw member 11 and the second claw member 12 are biased via respective first springs 9a and second springs 9b each composed of a pair of springs 9 to the cage 7 fixed to the outer ring 3.

[0034] The first spring 9a and the second spring 9b of the pair of springs 9 are respectively inserted into and accommodated in the pair of first holding holes 7a and second holding holes 7b from the outer side in the radial direction. The first spring 9a and the second spring 9b are respectively inserted into the first holding hole 7a and the second holding hole 7b until the first extending portion 91 and the third extending portion 97 of the pair of springs 9 respectively contact the guide groove 7c of the cage 7. Since the first extending portion 91 and the third extending portion 97 are guided by the guide groove 7c, the pair of springs 9 are positioned in the circumferential direction. Then, the second extending portion 94 of the pair of springs 9 is fixed to the clamping portion 7d of the cage 7. The second extending portion 94 of the pair of springs 9 is located below the first extending portion 91 and the third extending portion 97 by a length z1 in the biasing direction Z. Therefore, the second extending portion 94 can be clamped by the clamping portion 7d of the cage 7 without protruding outward in the radial direction. Since the second extending portion 94 is fixed to the clamping portion 7d of the cage 7 in this way, the pair of springs 9 do not rotate. As shown in FIG. 7(C), the radially concave portion 3f of the outer ring 3 has a concave shape so that the spring fixing portion 7f corresponds thereto.

[0035] As described above, in the ratchet clutch 1 of the embodiment, since the pair of springs 9 can be inserted from the outside of the outer periphery of the retainer 7, an excellent effect that the assemblability is good is achieved. Further, since the end portions of the coiled portions of each of the pair of springs 9 are arranged at determined positions, an excellent effect that there is no variation in the seating posture of the end portions is achieved.

[0036] Next, the operation of the ratchet clutch 1 of the embodiment will be described. The ratchet clutch 1 can take the following three states by changing the combination of the engaged state and the non-engaged state of the first claw member 11 and the second claw member 12 with respect to the tooth portion of the inner ring 5. FIG. 5(A) shows the position of the claw mechanism portion in the first state of two-way locking. FIG. 5(B) shows the position of the claw mechanism portion in the second state of one-way locking. FIG. 5(C) shows the position of the claw mechanism portion in the third state of two-way free rotation. Note that the ratchet clutch 1 of the embodiment may be configured to switch the locking direction of the rotation of the inner ring 5 with respect to the outer ring 3 by a plate member (not shown) that controls the claw mechanism portion. Or, it may be configured such that when the rotational speed of the outer ring 3 exceeds a predetermined speed due to centrifugal force, the engagement between the claw mechanism portion and the tooth portion of the inner ring 5 is released.

[0037] In the first state of the ratchet clutch 1 of the embodiment, as shown in FIG. 5(A), the first claw member 11 and the second claw member 12 are engaged with the first engagement portion 5a and the second engagement portion 5b of the inner ring 5 by the biasing forces of the first spring 9a and the second spring 9b, respectively. In this first state, the inner ring 5 is locked against rotation in either the circumferential one direction or the circumferential other direction with respect to the outer ring 3. Therefore, neither the torque in one direction nor the torque in the other direction is transmitted from the inner ring 5 to the outer ring 3.

[0038] In the second state of the ratchet-type clutch 1 of the embodiment, as shown in FIG. 5(B), the first claw member 11 rotates about the cylindrical portion 11c, and the claw portion 11b is displaced and held radially outward. In this second state, the second claw member 12 meshes with the second engagement portion 5b of the inner ring 5 by the biasing force of the second spring 9b, and the first claw member 11 is not meshed with the first engagement portion 5a of the inner ring 5. In this second state, the inner ring 5 can rotate in the other circumferential direction with respect to the outer ring 3, and the rotation in one circumferential direction is locked. Therefore, torque in one direction is transmitted from the inner ring 5 to the outer ring 3, and torque in the other direction is not transmitted.

[0039] In the third state of the ratchet-type clutch 1 of the embodiment, as shown in FIG. 5(C), the first claw member 11 rotates about the cylindrical portion 11c, and the claw portion 11b is pushed up and held radially outward. Also, the second claw member 12 similarly rotates about the cylindrical portion 12c, and the claw portion 12b is pushed up and held radially outward. In this third state, both the first claw member 11 and the second claw member 12 are not meshed with the first engagement portion 5a and the second engagement portion 5b of the inner ring 5. In this third state, the inner ring 5 is not locked against rotation in either the one circumferential direction or the other circumferential direction with respect to the outer ring 3, and rotation in either the one circumferential direction or the other circumferential direction is possible. Therefore, neither torque in one direction nor torque in the other direction is transmitted from the inner ring 5 to the outer ring 3.

[0040] As described above, in the ratchet-type clutch 1 of the embodiment, since the pair of springs 9 can be inserted from the outer side of the outer periphery of the holder 7, the assemblability does not deteriorate. Further, since the terminal ends of the wound portions of the pair of springs 9 are arranged at determined positions, there is no variation in the seating postures of the terminal ends. As a result, the biasing forces of the pair of springs 9 are stabilized, and breakage of the pair of springs 9 is reduced, so that the operation of the clutch is stabilized. According to the embodiment, it is possible to provide a ratchet-type clutch 1 capable of stably biasing the claw members.

Description of Reference Numerals

[0041] 1 Ratchet-type clutch 3 Outer ring (second annular member) 5 Inner ring (first annular member) 5a First engaging portion (first engaging part) 5b Second engaging portion (second engaging part) 7 Cage (holding member) 7a First holding hole (hole) 7b Second holding hole (hole) 7c Guide groove (positioning part) 7d Clamping portion (fixing part) 9 Pair of springs (pair of biasing members) 9a First spring (first biasing member) 9a1 One end portion (one end side) 9b Second spring (second biasing member) 9a2 Coil winding portion 9b2 Coil winding portion 11 First claw member 12 Second claw member 91 First extending portion 92 First curved portion 93 Second curved portion 94 Second extending portion 95 Third curved portion 96 Fourth curved portion 97 Third extending portion X1 First direction X2 Third direction Y Second direction (Y-axis direction) Z Biasing direction (Z-axis direction)

Claims

1. a first annular member, a second annular member arranged coaxially and relatively rotatably with respect to the first annular member, a first claw member capable of locking the relative rotation of the first annular member with respect to the second annular member in a first rotational direction, a second claw member capable of locking the relative rotation of the first annular member with respect to the second annular member in a second rotational direction, a holding member that holds the first claw member and the second claw member and is fixed to the second annular member, in a ratchet type clutch having a first biasing member that biases the first claw member in a radial direction and a second biasing member that biases the second claw member in the radial direction, the ratchet type clutch, characterized in that the first biasing member and the second biasing member are a pair of biasing members integrally formed in parallel.

2. The ratchet type clutch according to claim 1, characterized in that a seat winding portion of the first biasing member and a seat winding portion of the second biasing member are configured to be substantially symmetric.

3. The ratchet type clutch according to claim 1, characterized in that winding directions of the first biasing member and the second biasing member are different from each other.

4. The ratchet type clutch according to claim 1, characterized in that the first biasing member and the second biasing member are compression coil springs.

5. The pair of biasing members has a first extending portion extending from one end side of the first biasing member in a first direction substantially orthogonal to the biasing direction of the pair of biasing members, a first curved portion curved obliquely in the biasing direction with respect to the first direction, a second curved portion connected to the first curved portion and curved in a second direction substantially orthogonal to the biasing direction, a second extending portion extending from the second curved portion, a third curved portion curved in a direction substantially orthogonal to the second direction from the second extending portion and curved obliquely in the biasing direction, a fourth curved portion connected to the third curved portion and curved in a third direction, a third extending portion extending in the third direction from the fourth curved portion, and the second biasing member on the other end side of the third extending portion, and is configured as such, the ratchet type clutch according to claim 1.

6. The holding member has a pair of holes provided to penetrate in the radial direction in an outer peripheral portion, a positioning portion that positions the pair of biasing members, and a fixing portion that fixes the pair of biasing members. Each of the first biasing member and the second biasing member is received in the pair of holes, the first extending portion and the third extending portion of the pair of biasing members are guided by the positioning portion, and the second extending portion of the pair of biasing members is fixed by the fixing portion. The ratchet type clutch according to claim 5, characterized in that.

7. A plurality of pairs of the first claw member and the second claw member are provided in the circumferential direction. A plurality of the pair of holes are provided corresponding to the plurality of pairs. The ratchet type clutch according to claim 6, characterized in that a plurality of the fixing portions are provided corresponding to the plurality of pairs.

8. The holding member is an annular member coaxial with the second annular member and is fitted to the inner peripheral surface of the second annular member. The ratchet type clutch according to claim 1, characterized in that the holding member is formed of a resin material.

9. The first annular member includes a plurality of first engaging portions and second engaging portions. The first claw member locks the relative rotation of the first annular member with respect to the second annular member in the first rotation direction by engaging with the first engaging portion, whereby the first annular member and the second annular member are engaged so as to be torque-transmittable. The second claw member locks the relative rotation of the first annular member with respect to the second annular member in the second rotation direction by engaging with the second engaging portion, whereby the first annular member and the second annular member are engaged so as to be torque-transmittable. The ratchet type clutch according to any one of claims 1 to 8, characterized in that.

10. A first annular member, A second annular member arranged coaxially and relatively rotatably with respect to the first annular member, A first claw member capable of locking the relative rotation of the first annular member with respect to the second annular member in the first rotation direction, A second claw member capable of locking the relative rotation of the first annular member with respect to the second annular member in the second rotation direction, A holding member that holds the first claw member and the second claw member and is fixed to the second annular member, A method of assembling a ratchet type clutch having a first biasing member that biases the first claw member in the radial direction and a second biasing member that biases the second claw member in the radial direction, Inserting the first claw member and the second claw member into the holding member from the axial direction. A step of inserting the first biasing member and the second biasing member, which are integrally formed from the outside toward the inside, into a pair of holes provided to penetrate the outer peripheral portion of the holding member in the radial direction; A step of fixing the integrally formed first biasing member and second biasing member to the fixing portion of the holding member so that each of the first claw member and the second claw member is biased in the radial direction by the first biasing member and the second biasing member; A step of inserting the holding member into the second annular member; A step of inserting the first annular member inside the holding member inserted into the second annular member; An assembling method of a ratchet type clutch having the above steps.

11. A first biasing member; A pair of biasing members including a second biasing member integrally formed in parallel with the first biasing member, The pair of biasing members, wherein a seat winding portion of the first biasing member and a seat winding portion of the second biasing member are configured to be substantially symmetric.

12. The pair of biasing members includes a first extending portion extending from one end side of the first biasing member in a first direction substantially orthogonal to the biasing direction of the pair of biasing members, A first curved portion curved obliquely in the biasing direction with respect to the first direction, a second curved portion connected to the first curved portion and curved in a second direction substantially orthogonal to the biasing direction, a second extending portion extending from the second curved portion, and a third curved portion curved in a direction substantially orthogonal to the second direction from the second extending portion and curved obliquely in the biasing direction, a fourth curved portion connected to the third curved portion and curved in a third direction, a third extending portion extending in the third direction from the fourth curved portion, and the second biasing member on the other end side of the third extending portion, and the pair of biasing members according to claim 11, characterized in that they are configured to have the above structure.

13. The pair of biasing members according to claim 11, wherein the winding directions of the first biasing member and the second biasing member are different from each other.

14. The pair of biasing members according to claim 11, wherein the first biasing member and the second biasing member are compression coil springs.

15. The pair of biasing members according to any one of claims 11 to 14, wherein the pair of biasing members biases a pair of claw members that lock the rotation provided in a ratchet type clutch.

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