Ratchet type clutch device

Abstract

The invention provides a ratchet-type clutch device which is small in deformation after a retainer is formed. An outer ring of a ratchet-type clutch device includes an outer ring body, a plurality of claw members, and a retainer. The inner peripheral surface of the outer ring main body is provided with a plurality of embedded parts which are separated from each other in the circumferential direction; and a plurality of shaft accommodating parts which are arranged on two sides of the embedded part in the circumferential direction. The claw member includes: a shaft portion disposed in the shaft accommodating portion; and a claw part protruding from the shaft part. The holder is provided with: a plurality of fitting parts which are fitted to the fitting-receiving parts; a plurality of holding pieces covering the inner peripheral side of the shaft accommodating part and forming an opening through which the claw part passes between the holding pieces and the fitting part; a plurality of first connection parts disposed on one side in the axial direction with respect to the opening and connecting the fitting part and the holding piece; and a plurality of second connection parts disposed on the other side in the axial direction with respect to the opening and connecting the fitting part and the holding piece. The retainer is composed of a first retainer and a second retainer which are divided from the central part in the axial direction to one side and the other side in the axial direction.

Description

Technical Field

[0001] The present disclosure relates to a ratchet-type clutch device. Background Art

[0002] A ratchet clutch device consists of an outer ring and an inner ring. The inner ring is positioned inside the outer ring and has multiple teeth on its outer circumference. The outer ring comprises an annular outer ring body; multiple pawl members positioned on the inner circumference of the outer ring body; and a retainer that holds the pawl members in place to prevent them from falling radially inward. The pawl members comprise a shaft portion rotatably positioned between the outer ring body and the retainer; and pawl portions that protrude from an opening formed in the retainer toward the inner circumference of the retainer.

[0003] As described in the following patent document, a conventional retainer comprises an annular plate; multiple interlocking portions projecting axially from the annular plate; and multiple retaining plates projecting axially from the annular plate and positioned between the interlocking portions. The interlocking portions engage recesses formed on the inner circumferential surface of the outer ring body. This allows the retainer to rotate integrally with the outer ring body. The retaining plates support the shaft of the claw member from the inner circumferential side. Furthermore, the retaining plates are separated from the interlocking portions positioned on both circumferential sides. In other words, an opening is formed between the interlocking portions and the retaining plates, through which the claw portion of the claw member passes. The annular plate forms the end surface of one axial side of the retainer, closing one axial side of the opening. As can be seen from the above, the retainer opening is open on the other axial side. Furthermore, the claw member is assembled into the opening from the other axial side of the opening. Furthermore, after the claw member is assembled, the other axial side of the opening is closed with an annular cover member.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-156426

[0007] Furthermore, in most cases, retainers are made of resin materials and manufactured by injection molding. Such retainers deform after molding (after cooling). Therefore, a new retainer that can minimize the amount of deformation after molding is desired. Summary of the Invention

[0008] The present disclosure has been made in view of the above-mentioned circumstances, and an object thereof is to provide a ratchet-type clutch device having a small amount of deformation of a retainer after molding.

[0009] To achieve the above object, a ratchet type clutch device according to one aspect of the present disclosure includes an outer ring and an inner ring disposed coaxially with a central axis of the outer ring and provided with a plurality of tooth portions on an outer peripheral surface. A direction parallel to the central axis is defined as an axial direction. The outer ring includes an annular outer ring body, a plurality of pawl members disposed on an inner peripheral side of the outer ring body, and a retainer disposed on the inner peripheral side of the outer ring body and retaining the pawl members. A plurality of fitted portions recessed toward a radial direction outer side and disposed separately from each other in a circumferential direction are formed on an inner peripheral surface of the outer ring body, and a plurality of shaft receiving portions recessed toward the radial direction outer side and disposed on both circumferential sides of the fitted portions are formed. The pawl members include shaft portions disposed in the shaft receiving portions and pawl portions protruding from the shaft portions. The retainer includes a plurality of fitting portions fitted to the fitted portions, a plurality of retaining pieces covering the inner peripheral side of the shaft receiving portions and forming openings for the pawl portions to pass through between the fitting portions, a plurality of first linking portions linking the fitting portions and the retaining pieces on one side of the openings with respect to the axial direction, and a plurality of second linking portions linking the fitting portions and the retaining pieces on the other side of the openings with respect to the axial direction. The retainer is composed of a first retainer and a second retainer divided from a central portion of the axial direction to the one side and the other side of the axial direction.

[0010] Effects of Invention

[0011] According to the ratchet type clutch device of the present disclosure, the retainer is composed of the first retainer and the second retainer, and the object (the first retainer and the second retainer) manufactured by injection molding is miniaturized. Therefore, the amount of deformation of the retainer (the first retainer and the second retainer) after molding is suppressed to be small. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic view that schematically shows a cross section of the ratchet type clutch device of Embodiment 1 cut in a direction orthogonal to the axial direction.

[0013] Figure 2 is an enlarged view that enlarges a part of Figure 1 .

[0014] Figure 3 is a front view of III-III of Figure 1 .

[0015] Figure 4 is a front view of IV-IV of Figure 1 .

[0016] Figure 5 is a cross-sectional view in a case where the first pawl portion is hooked to one side surface of the tooth portion in Embodiment 1.

[0017] Figure 6 FIG. 4 is a sectional view in a case where the rotational speed of the outer ring in Embodiment 1 is greater than a prescribed speed.

[0018] Figure 7 FIG. 5 is an exploded perspective view of the retainer of Embodiment 1.

[0019] Figure 8 FIG. 6 is a view of the retainer of Embodiment 1 as viewed from the outer peripheral side.

[0020] Figure 9 FIG. 7 is an exploded perspective view of the retainer of Modification 1.

[0021] Figure 10 FIG. 8 is a sectional view of the ratchet-type clutch device of Modification 1 as obtained by cutting along a direction orthogonal to the axial direction.

[0022] Figure 11 FIG. 9 is a view of the partial retainer of Modification 2 as viewed from the outer peripheral side.

[0023] Explanation of Reference Numerals

[0024] 1: outer ring; 2: inner ring; 3: tooth portion; 10: outer ring main body; 12: fitting- received portion; 15: wall portion; 30: retainer; 20: shaft receiving portion; 21: circular arc surface; 27: retainer ring; 31: fitting portion; 35: through-hole; 36: spring; 40: retainer piece; 41: first connecting portion; 42: second connecting portion; 44: opposing circular arc surface; 45: opening; 50: seat; 55: recessed portion; 60: claw member; 61: shaft portion; 62: claw portion; 63: protruding piece; 100, 100A, 100B: ratchet-type clutch device; 130, 130A: first retainer; 230, 230A: second retainer; 131: first fitting portion; 140: first retainer piece; 231: second fitting portion; 240: second retainer piece; 1030: partial retainer; 1130: partial first retainer; 1140: first retainer short piece; 1230: partial second retainer; 1240: second retainer short piece. DETAILED DESCRIPTION

[0025] Embodiments for carrying out the present disclosure are explained in detail with reference to the drawings. The present disclosure is not limited by what is described in the following explanation. Furthermore, the constituent elements described below include elements that are substantially the same as those easily conceived by those skilled in the art. Also, the constituent elements described below can be appropriately combined.

[0026] (Embodiment 1)

[0027] Figure 1This schematic diagram schematically illustrates a cross-section of a ratchet clutch device according to Embodiment 1, taken along a direction perpendicular to the axial direction. The ratchet clutch device 100 comprises an annular outer ring 1; an inner ring 2 disposed inside the outer ring 1; and a housing (not shown) that supports the outer ring 1 and inner ring 2 for relative rotation. The outer ring 1 and inner ring 2 are coaxially disposed and rotate about a central axis X. Hereinafter, the direction parallel to the central axis X is referred to as the axial direction. Furthermore, the direction perpendicular to the central axis X is referred to as the radial direction.

[0028] The outer circumference of the inner ring 2 is formed with teeth 3 protruding radially outward at equal intervals along the circumference. The teeth 3 have a side surface 6 facing one circumferential side and a side surface 7 facing the other circumferential side. Hereinafter, with respect to the direction of rotation (circumferential direction) centered on the central axis X, the direction facing the side surface 6 is referred to as the first rotational direction L1, and the direction facing the side surface 7 is referred to as the second rotational direction L2.

[0029] The outer ring 1 includes an annular outer ring body 10 , an annular retainer 30 disposed on the inner circumference of the outer ring body 10 , and a plurality of claw members 60 .

[0030] The inner circumferential surface 11 of the outer ring body 10 is circular, centered on the central axis X, when viewed axially. The inner circumferential surface 11 of the outer ring body 10 includes three radially outwardly recessed mating portions 12 and three radially outwardly recessed shaft receiving portions 20. The pair of shaft receiving portions 20 are arranged on either side of the mating portion 12 in the circumferential direction. Hereinafter, the one of the pair of shaft receiving portions 20 arranged in the first rotational direction L1 when viewed from the mating portion 12 is referred to as the first shaft receiving portion 20A, and the one of the pair of shaft receiving portions 20 arranged in the second rotational direction L2 when viewed from the mating portion 12 is referred to as the second shaft receiving portion 20B.

[0031] It should be noted that Figure 1 The three imaginary lines H shown are straight lines extending radially from the central axis X and are arranged at intervals of 120°. The cross-sectional shape of the outer ring 1 of this embodiment exhibits threefold rotational symmetry about the central axis X. That is, if the cross-sectional shape of the outer ring 1 is divided into three parts along the imaginary lines H in the circumferential direction, the cross-sectional shape of one of the three parts is identical to the other parts. Therefore, the following description focuses on one of the three parts.

[0032] Figure 2 It will Figure 1 A magnified image of a portion of the Figure 2As shown, the inner surface of the engaged portion 12 includes a bottom surface 13 extending circumferentially and facing radially inward, and a pair of opposing surfaces 14 facing each other circumferentially. Opposing surfaces 14 extend radially inward from the circumferential ends of bottom surface 13. The inner surface of the shaft receiving portion 20 includes an arcuate surface 21. Arcuate surface 21 extends circumferentially from the radially inner ends of opposing surfaces 14.

[0033] Furthermore, in the outer ring body 10 of this embodiment, an extended housing portion 22 is formed along the first rotational direction L1 of the first shaft housing portion 20A. The inner surface of the extended housing portion 22 is formed with a linear surface 23 extending linearly from the end of the arcuate surface 21 of the first shaft housing portion 20A in the first rotational direction L1, and a guide surface 24 extending radially inward from the end of the linear surface 23 and connected to the inner circumferential surface 11.

[0034] Figure 3 yes Figure 1 The cross-sectional view along the III-III direction. Figure 3 As shown, an annular wall portion 15 is formed at one axial end of the outer ring body 10. The wall portion 15 blocks one axial side of the mating portion 12, the shaft accommodating portion 20, and the extension accommodating portion 22. Meanwhile, the mating portion 12, the shaft accommodating portion 20, and the extension accommodating portion 22 are open on the other axial side. Therefore, components can be assembled into the mating portion 12, the shaft accommodating portion 20, and the extension accommodating portion 22 from the other axial side. Hereinafter, when viewed from the axial center of the outer ring body 10, the direction in which the wall portion 15 is arranged is referred to as the first axial direction X1, and the direction opposite to the first axial direction X1 is referred to as the second axial direction X2.

[0035] like Figure 2 As shown, the retainer 30 has: a fitting portion 31, which is arranged on the fitted portion 12; a retaining piece 40, which extends along the inner peripheral surface 11 of the outer ring body 10; and a first connecting portion 41 and a second connecting portion 42 (see Figure 4 ), the fitting portion 31 is connected to the holding piece 40. In addition, the retainer 30 is formed of a resin material. As the type of resin material, for example, engineering plastics and super engineering plastics can be listed, but the present disclosure is not limited thereto.

[0036] The mating portion 31 has an outer side surface 32 facing radially outward, a pair of circumferential side surfaces 33 facing circumferentially, and an inner side surface 34 facing radially inward. The pair of circumferential side surfaces 33 abut against the pair of opposing surfaces 14. Therefore, when the outer ring body 10 rotates, the opposing surfaces 14 press the circumferential side surfaces 33 circumferentially, causing the retainer 30 and the outer ring body 10 to rotate integrally. Furthermore, the width W1 of the pair of circumferential side surfaces 33 (pair of opposing surfaces 14) gradually decreases radially inward. Therefore, the mating portion 31 does not fall radially inward from the mated portion 12.

[0037] The outer side surface 32 is in contact with the bottom surface 13. Further, in the fitting portion 31, two through holes 35 that pass through the outer side surface 32 and the inner side surface 34, two springs 36 that are housed in the through holes 35, and two seats 50 that close the radial outer side of the through holes 35 are provided.

[0038] The two through holes 35 have a first through hole 35A that is disposed at a position closer to the first rotation direction L1 than the central portion of the circumferential direction of the fitting portion 31, and a second through hole 35B that is disposed at a position closer to the second rotation direction L2 than the central portion of the circumferential direction of the fitting portion 31. The two springs 36 have a first spring 36A that is housed in the first through hole 35A, and a second spring 36B that is housed in the second through hole 35B. In the present embodiment, the spring constants of the first spring 36A and the second spring 36B are different from each other. The two seats 50 are members for preventing the springs 36 from falling out to the radial outer side from the through holes 35. Note that the details of the seats 50 are described later.

[0039] The holding piece 40 covers the pair of shaft housing portions 20 and the extension housing portion 22 from the radial inner side. In the outer peripheral surface 43 of the holding piece 40, a portion that is radially opposed to the circular arc surface 21 is formed with a circular arc-shaped opposed circular arc surface 44.

[0040] Further, the end portion of the circumferential direction of the holding piece 40 is separated from the fitting portion 31. Therefore, an opening 45 is formed between the holding piece 40 and the fitting portion 31. Further, the width of the opening 45 is W2 (refer to FIG. 6). Figure 4

[0041] Figure 4 is a cross-sectional view taken along the line IV-IV of Figure 1 As shown in Figure 4 , the first link portion 41 and the second link portion 42 are disposed between the fitting portion 31 and the holding piece 40, linking the fitting portion 31 and the holding piece 40 to each other. The first link portion 41 is disposed in the first axial direction with respect to the opening 45. Further, the second link portion 42 is disposed in the second axial direction X2 with respect to the opening 45. Therefore, the opening 45 formed in the retainer 30 is closed throughout the entire circumference, and is not open.

[0042] As shown in Figure 1 , the holding piece 40 extends in the circumferential direction between the two fitting portions 31. Also, both end portions of the circumferential direction of the holding piece 40 are connected to the fitting portions 31 via the first link portion 41 and the second link portion 42. Thus, the plurality of fitting portions 31 and the plurality of holding pieces 40 are connected in the circumferential direction, constituting the ring-shaped retainer 30. In addition, as shown in Figure 3 , the wall portion 15 extends to the radial inner side than the inner peripheral surface 11 of the outer ring main body 10. Also, the holding piece 40 is supported from the first axial direction X1 by the wall portion 15.

[0043] As shown in Figure 3 ​As shown, the retainer 30 is assembled to the outer ring body 10 by positioning the retainer 30 in the second axial direction (X2) of the outer ring body 10 and inserting the retainer 30 into the outer ring body 10. Once assembled to the outer ring body 10, the retainer 30 abuts against the wall 15 of the outer ring body 10. Therefore, the retainer 30 does not fall out of the outer ring body 10 in the first axial direction (X1). Furthermore, a retaining ring 27 is provided on the inner circumferential surface 11 of the outer ring body 10. Furthermore, the fitting portion 31, the retaining piece 40, and the second connecting portion 42 abut against the retaining ring 27 in the second axial direction (X2). Therefore, the retainer 30 does not fall out of the outer ring body 10 in the second axial direction (X2).

[0044] like Figure 2 As shown, the claw member 60 includes a shaft portion 61 housed in the shaft housing 20 and a claw portion 62 protruding from the shaft portion 61. The shaft portion 61 is circular when viewed from the axial direction. The shaft portion 61 is rotatably supported between the arcuate surface 21 and the opposing arcuate surface 44. This allows the claw member 60 to swing about the shaft portion 61.

[0045] The claw portion 62 passes through the opening 45 and is arranged radially inward of the fitting portion 31. The claw portion 62 is urged radially inward by the spring 36 (first spring 36A, second spring 36B). In addition, the outer diameter of the shaft portion 61 and the width of the claw portion 62 are larger than the width W2 of the opening 45 (see FIG. Figure 4 Therefore, the claw member 60 does not fall off from the opening 45.

[0046] As for the claw member 60, the two claw members 60 accommodated in a pair of shaft accommodating portions 20 are treated as a group. Hereinafter, the claw member 60 in which the shaft portion 61 is accommodated in the first shaft accommodating portion 20A is referred to as the first claw member 60A. The shaft portion 61 of the first claw member 60A is referred to as the first shaft portion 61A. The claw portion 62 of the first claw member 60A is referred to as the first claw portion 62A. In addition, the claw member 60 in which the shaft portion 61 is accommodated in the second shaft accommodating portion 20B is referred to as the second claw member 60B. The shaft portion 61 of the second claw member 60B is referred to as the second shaft portion 61B. The claw portion 62 of the second claw member 60B is referred to as the second claw portion 62B.

[0047] The first claw member 60A of this embodiment has a protruding piece 63 that protrudes from the first shaft portion 61A in a direction opposite to the first claw portion 62A. The protruding piece 63 is accommodated in the extended accommodating portion 22. In addition, the top end surface 64 of the protruding piece 63 is opposite to the guide surface 24. It should be noted that the details of the protruding piece 63 and the guide surface 24 are described in the section on the operation of the ratchet clutch device 100. In addition, the center of gravity G of the second claw member 60B is arranged on the second claw portion 62B.

[0048] Figure 5 This is a cross-sectional view of a case where the first claw portion is hooked on one side surface of the tooth portion in the first embodiment.Figure 6 is a sectional view in a case where the rotational speed of the outer race in Embodiment 1 is greater than the prescribed speed. Next, the operation of the ratchet-type clutch device 100 is described. In a case where no torque is input to the outer race 1 and the inner race 2, as shown in FIG. 6A, the first pawl portion 62A and the second pawl portion 62B, which are forced by the spring 36, enter between the tooth portions 3 of the inner race 2. Figure 2

[0049] Further, if the inner race 2 relatively rotates in the second rotational direction L2 with respect to the outer race 1, the second pawl portion 62B hooks the other side surface 7 of the tooth portion 3. Therefore, the torque in the second rotational direction L2 is transmitted from the inner race 2 to the outer race 1, and the inner race 2 and the outer race 1 rotate at the same speed in the second rotational direction L2.

[0050] Further, if the inner race 2 relatively rotates in the first rotational direction L1 with respect to the outer race 1, the first pawl portion 62A hooks the one side surface 6 of the tooth portion 3. Therefore, the torque in the first rotational direction L1 is transmitted from the inner race 2 to the outer race 1, and the inner race 2 and the outer race 1 rotate at the same speed in the first rotational direction L1.

[0051] As shown in FIG. 6B, when the inner race 2 relatively rotates in the first rotational direction L1 with respect to the outer race 1 and the first pawl portion 62A hooks the one side surface 6 of the tooth portion 3, the first pawl portion 62A receives a load (refer to arrow Al) in a direction orthogonal to the one side surface 6 from the one side surface 6. Thus, the first pawl portion 62A moves in the load direction (the direction of arrow Al). Figure 5 Thus, the tip end surface 64 of the protruding piece 63 comes into contact with the guide surface 24 of the expanded accommodation portion 22. Further, the guide surface 24 guides the protruding piece 63 to move in the radial direction outward (refer to arrow A2). Thus, the first pawl member 60A rotates, and the tip end portion of the first pawl portion 62A moves in the radial direction inward (refer to arrow A3). Therefore, the tip end portion of the first pawl portion 62A comes into abutment with the base portion side of the tooth portion 3, and the engagement of the tooth portion 3 with the first pawl member 60A is stabilized.

[0052] Further, when the inner race 2 relatively rotates in the first rotational direction L1 with respect to the outer race 1 and the rotational speed of the inner race 2 and the outer race 1 is greater than the prescribed speed, the second pawl portion 62B moves in the radial direction outward against the force of the second spring 36B due to the centrifugal force (refer to arrow Bl of FIG. 6D). Accordingly, as shown in FIG. 6D, the second pawl portion 62B does not hook the other side surface 7, and the outer race 1 is allowed to relatively rotate in the first rotational direction L1 with respect to the inner race 2.

[0053] Figure 5 Figure 6

[0054] ​​​​In this state, if a torque with a higher rotational speed than that of the inner ring 2 is input to the outer ring 1, the outer ring 1 rotates relative to the inner ring 2 in the first rotational direction L1. As a result, the first claw 62A climbs onto the tooth portion 3, and the first claw member 60A swings (see Figure 6 On the other hand, when the rotation speed of the outer ring 1 becomes lower than the predetermined speed, the centrifugal force acting on the second claw 62B also decreases. As a result, the second claw 62B is urged by the second spring 36B and enters between the teeth 3.

[0055] Next, the details of the retainer 30 according to the first embodiment will be described. Figure 7 This is an exploded perspective view of the cage according to the first embodiment. Figure 8 This is a diagram of the retainer according to Embodiment 1 as viewed from the outer peripheral side. Figure 7 As shown, retainer 30 is composed of two parts that can be divided in the axial center. That is, retainer 30 is composed of a first retainer 130 and a second retainer 230 that are divided from the axial center toward one side and the other side. It should be noted that both first retainer 130 and second retainer 230 are made of resin.

[0056] The first retainer 130 includes three first fitting portions 131, three first retaining pieces 140, and six first connecting portions 41. The first fitting portion 131 defines the first axial direction X1 side from the axial center of the fitting portion 31. Furthermore, the first retaining piece 140 defines the first axial direction X1 side from the axial center of the retaining piece 40.

[0057] The second retainer 230 includes three second fitting portions 231, three second retaining pieces 240, and six second connecting portions 42. The second fitting portion 231 defines the second axial direction X2 side from the axial center of the fitting portion 31. Furthermore, the second retaining piece 240 defines the second axial direction X2 side from the axial center of the retaining piece 40.

[0058] The first fitting portion 131 has a first split surface 132 facing the second axial direction X2. A first convex portion 133 and a first concave portion 134 are formed on the first split surface 132.

[0059] like Figure 3 As shown, the second engaging portion 231 further includes a second split surface 232 oriented in the first axial direction X1. The second split surface 232 abuts the first split surface 132. A second protrusion 233 and a second recess 234 are formed on the second split surface 232. Furthermore, the first protrusion 133 engages with the second recess 234, and the second protrusion 233 engages with the first recess 134. Therefore, when the first retainer 130 and the second retainer 230 are combined, alignment of the first retainer 130 and the second retainer 230 is facilitated.

[0060] Further, as shown in Figure 7 the first retainer 130 and the second retainer 230, the claw member 60 is arranged between the first retainer 130 and the second retainer 230. Also, the claw member 60 is inserted from the open portions of the first openings 145 and the second openings 245 into the interiors of the first openings 145 and the second openings 245, respectively. Thereby, as shown in Figure 8 , the claw member 60 and the retainer 30 can be integrated (unitized).

[0061] In the present embodiment, the spring 36 can also be assembled together with the retainer 30 integrated (unitized) with the claw member 60. Thereby, in a case where the through-hole 35 accommodates the spring 36, the claw portion 62 is arranged on the radially inner side (refer to Figure 8 ). Therefore, the spring 36 does not fall off toward the inner circumferential side.

[0062] As shown in Figure 7 , two radially extending semicircular first grooves 135 are formed in the first split surface 132 of the first retainer 130. As shown in Figure 8 , two radially extending semicircular second grooves 235 are also formed in the second split surface 232 of the second retainer 230. The first grooves 135 and the second grooves 235 are axially opposed. Therefore, if the first retainer 130 and the second retainer 230 are combined, the through-hole 35 (the first through-hole 35A, the second through-hole 35B) is formed.

[0063] Further, as shown in Figure 8 , the stand 50 (the first stand 50A, the second stand 50B) has a main body portion 51 (the first main body portion 51A, the second main body portion 51B) radially overlapping the through-hole 35, and a pair of locking pieces 52 (the first locking piece 52A, the second locking piece 52B) protruding from the main body portion 51 toward both sides in the axial direction.

[0064] A protrusion (not shown) for fitting the spring 36 is formed in a surface of the main body portion 51 facing the radially inner side. Therefore, by assembling the stand 50 to the retainer 30, the spring 36 can also be assembled at the same time.

[0065] Further, a recess 55 for fitting the stand 50 is formed in the outer side surface 32 of the fitting portion 31. The recess 55 has a first recess 55A for accommodating the first stand 50A and a second recess 55B for accommodating the second stand 50B. The first recess 55A is formed in the same shape as the outer shape of the first stand 50A. The second recess 55B is formed in the same shape as the outer shape of the second stand 50B.

[0066] The first main portion 51A is formed in a circular shape when viewed from the radial outer side. On the other hand, the second main portion 51B is formed in a quadrangular shape when viewed from the radial outer side. That is, the first stand 50A and the second stand 50B are formed in mutually different shapes. Therefore, the first stand 50A cannot be assembled in the second recess 55B. Similarly, the second stand 50B cannot be assembled in the first recess 55A. As described above, erroneous assembly of the first stand 50A assembled with the first spring 36A in the second recess 55B or the second stand 50B assembled with the second spring 36B in the first recess 55A is avoided.

[0067] Further, the locking piece 52 is gradually widened in width as it departs from the main portion 51 toward the outer side in the axial direction. Therefore, if the first holder 130 moves relative to the locking piece 52 in the first axial direction XI, the locking piece 52 is hooked to the inner surface of the recess 55, and the movement of the first holder 130 is restricted. Similarly, if the second holder 230 moves relative to the locking piece 52 in the second axial direction X2, the locking piece 52 is hooked to the inner surface of the recess 55, and the movement of the second holder 230 is restricted. As described above, the separation of the first holder 130 and the second holder 230 is suppressed by the stand 50.

[0068] The effects of the ratchet-type clutch device 100 according to the next embodiment 1 will be described. The holder 30 according to the embodiment 1 is composed of the first holder 130 and the second holder 230 which are divided in the axial direction. Therefore, the object to be manufactured by injection molding is the first holder 130 and the second holder 230, and the axial size is smaller than that of the conventional holder. As a result, the cavity of the mold used in the injection molding is downsized, and the temperature and pressure in the cavity are easily fixed. Therefore, the amount of deformation after molding is suppressed to be small.

[0069] Further, according to the holder 30 of the present embodiment, the opening 45 is closed. That is, a cover member for preventing the pawl member 60 from falling off in the axial direction is not needed, and the number of components is reduced.

[0070] Further, according to the retainer 30 of the present embodiment, the pawl member 60, the spring 36, and the seat 50 are assembled to be unitized, and this unitized structure can be assembled to the outer ring body 10. Therefore, the assembling property of the ratchet-type clutch device 100 is improved. Note that, in the conventional retainer, the outer peripheral side of the through-hole that accommodates the spring is not closed. Therefore, after the retainer is assembled to the outer ring body to close the outer peripheral side of the through-hole, the spring is inserted from the inner peripheral side of the through-hole. However, according to this, since the pawl member is not provided, the spring can fall off to the inner peripheral side. That is, it is necessary to assemble the pawl member while pressing the spring from the through-hole to the inner peripheral side so that the spring does not fall off. Therefore, according to the present embodiment, such a trouble can be omitted, and the assembling property of the spring is also improved.

[0071] The embodiment 1 has been described above. Next, a modification example of the ratchet-type clutch device 100 of the embodiment 1 will be described. Further, in the following description, the points different from the previously described contents will be focused on.

[0072] (Modification Example 1)

[0073] Figure 9 is an exploded perspective view of the retainer of the modification example 1. Figure 10 is a cross-sectional view of the ratchet-type clutch device of the modification example 1, cut along a direction orthogonal to the axial direction. As Figure 9 indicated, the ratchet-type clutch device 100A of the modification example 1 is different from the embodiment 1 in that the first retainer 130A and the second retainer 230A are cut in the axial direction. In detail, the first retainer 130A and the second retainer 230A of the modification example 1 are three members (partial first retainer 1130, partial second retainer 1230) that are cut from the first retainer 130 and the second retainer 230 of the embodiment 1 along the imaginary line H as Figure 1 indicated.

[0074] As Figure 9 indicated, the first retainer 130A is composed of three partial first retainers 1130. The partial first retainer 1130 has the first fitting portion 131, a pair of first retainer tabs 1140 provided on both sides in the peripheral direction of the first fitting portion 131, and a pair of first connecting portions 41 that connect the first fitting portion 131 and the pair of first retainer tabs 1140. Note that the first fitting portion 131 and the first connecting portion 41 of the modification example 1 are the same as the first fitting portion 131 and the first connecting portion 41 of the embodiment 1. The first retainer tab 1140 is a portion that is cut from the first retainer tab 140 of the embodiment 1 at the central portion in the peripheral direction. That is, the three partial first retainers 1130 are cut from the first retainer tab 140 of the first retainer 130A.

[0075] The second retainer 230A is composed of three partial second retainers 1230. The partial second retainer 1230 has: a second interlocking portion 231; a pair of second retaining short pieces 1240, which are arranged on both sides of the second interlocking portion 231 in the circumferential direction; and a pair of second connecting portions 42, which connect the second interlocking portion 231 and the pair of second retaining short pieces 1240. It should be noted that the second interlocking portion 231 and the second connecting portion 42 of Modification 1 are the same as the second interlocking portion 231 and the second connecting portion 42 of Embodiment 1. The second retaining short piece 1240 is a portion formed by cutting off the second retaining piece 240 of Embodiment 1 at the central part in the circumferential direction. That is, the three partial second retainers 1230 are formed by cutting off the second retaining piece 240 of the second retainer 230A.

[0076] As can be seen from the above, according to Modification 1, the object manufactured by injection molding becomes a partial first retainer 1130 and a partial second retainer 1230. Therefore, compared to Embodiment 1, the object manufactured by injection molding is further miniaturized, and the amount of deformation after molding is suppressed to a smaller extent. Hereinafter, the component obtained by combining the partial first retainer 1130 and the partial second retainer 1230 is referred to as the partial retainer 1030.

[0077] It should be noted that in the first modification, the three partial retainers 1030 cannot be combined to form one retainer 30A. Figure 10 As shown, each retainer section 1030 is assembled into the outer ring body 10. This reduces the size of the object to be assembled into the outer ring body 10, improving assembly efficiency. Note that the engaging portion 31 of the retainer section 1030 engages with the engaged portion 12, preventing it from falling out toward the inner circumference.

[0078] In addition, if Figure 10 As shown, the circumferential lengths of the first retaining tabs 1140 and the second retaining tabs 1240 are shorter than those in the first embodiment, where the first retaining tabs 140 and the second retaining tabs 240 are cut at their circumferential center. That is, a gap S1 is formed between two circumferentially adjacent first retaining tabs 1140. Similarly, a gap S1 is formed between two circumferentially adjacent second retaining tabs 1240. Consequently, the object manufactured by injection molding is further miniaturized, and the amount of deformation after molding is further reduced. Furthermore, the amount of resin used in manufacturing retainer 30A is reduced.

[0079] (Variation 2)

[0080] Figure 11 This is a diagram of a portion of the retainer of Modification 2 viewed from the outer peripheral side. Figure 11As shown, the partial first retainer 1130 of the modified example 2 differs from the modified example 1 in that the length in the axial direction of the first retaining tab 1140B is small. Likewise, the partial second retainer 1230 differs from the modified example 1 in that the length in the axial direction of the second retaining tab 1240B is small.

[0081] If described in detail, the first retaining tab 1140B of the modified example 2 protrudes from the first connecting portion 41 toward the second axial direction X2 by an amount smaller than the first engaging portion 131. Further, the second retaining tab 1240B protrudes from the second connecting portion 42 toward the first axial direction XI by an amount smaller than the second engaging portion 231. Thus, a gap S2 is formed between the first retaining tab 1140 and the second retaining tab 1240.

[0082] With the ratchet-type clutch device 100B according to the modified example 2, the object to be manufactured by injection molding is further downsized, and the deformation amount after molding is further reduced. Further, the amount of resin used when manufacturing the retainer 30B is reduced.

[0083] The above describes the embodiment 1 and each modified example, but the present disclosure is not limited to the above examples. For example, the content of the modified example 2 can be applied to the embodiment 1. That is, the first retaining tab 140 of the first retainer 130 can be made shorter than the first engaging portion 131. Likewise, the second retaining tab 240 of the second retainer 230 can be made shorter than the second engaging portion 231.

[0084] In the embodiment 1 and the like, an example in which three sets of the claw members 60 are arranged in the circumferential direction is described, but the present disclosure is not limited to three sets as long as a plurality of sets of the claw members 60 are provided. Further, as the claw members 60, an example in which the first claw member 60A having the protruding tab 63 and the second claw member 60B in which the center of gravity G is located at the second claw portion 62B are used is described, but the present disclosure is not limited to the types of the claw members 60, and other claw members 60 can be used.

[0085] Further, the first claw member 60A inclines the first claw portion 62A toward the base portion side of the tooth portion 3 by the guide surface 24 and the protruding tab 63 when the first claw member 60A contacts the tooth portion 3, but the present disclosure can also incline the first claw portion 62A toward the base portion side of the tooth portion 3 by a configuration other than the guide surface 24 and the protruding tab 63.

[0086] Note that the present disclosure can also be a combination of the following configurations.

[0087] (1) A ratchet-type clutch device, comprising:

[0088] an outer ring; and

[0089] an inner ring arranged coaxially with a center axis of the outer ring, and provided with a plurality of tooth portions on an outer peripheral surface,

[0090] A direction parallel to the central axis is defined as an axial direction,

[0091] The outer ring has:

[0092] An annular outer ring body;

[0093] A plurality of claw members disposed on an inner peripheral side of the outer ring body; and

[0094] A retainer disposed on the inner peripheral side of the outer ring body, which retains the claw members,

[0095] An inner peripheral surface of the outer ring body has:

[0096] A plurality of fitted portions recessed toward the radial direction and disposed separately from each other in the circumferential direction; and

[0097] A plurality of shaft accommodating portions recessed toward the radial direction and disposed on both circumferential sides of the fitted portions,

[0098] The claw members have:

[0099] A shaft portion disposed in the shaft accommodating portion; and

[0100] A claw portion protruding from the shaft portion,

[0101] The retainer has:

[0102] A plurality of fitting portions fitted to the fitted portions;

[0103] A plurality of retaining pieces covering the inner peripheral side of the shaft accommodating portion and separated from the fitting portions to form openings for the claw portions to pass through between the fitting portions;

[0104] A plurality of first connecting portions disposed on one side of the axial direction with respect to the openings, which connect the fitting portions and the retaining pieces; and

[0105] A plurality of second connecting portions disposed on the other side of the axial direction with respect to the openings, which connect the fitting portions and the retaining pieces,

[0106] The retainer is composed of a first retainer and a second retainer divided from a central portion of the axial direction to one side and the other side of the axial direction.

[0107] (2) The ratchet-type clutch device according to (1), wherein

[0108] The first retainer has:

[0109] A first fitting portion from the central portion of the axial direction to one side of the fitting portions;

[0110] a second holding piece configured on the other side from the central portion in the axial direction of the holding piece, and

[0111] a plurality of the first connecting portions,

[0112] the second holder has:

[0113] a second fitting portion configured on one side from the central portion in the axial direction of the fitting portion;

[0114] a second holding piece configured on the other side from the central portion in the axial direction of the holding piece, and

[0115] a plurality of the second connecting portions.

[0116] (3) The ratchet-type clutch device according to (2), wherein

[0117] the first holding piece protrudes less than the first fitting portion toward the other side in the axial direction from the first connecting portion,

[0118] the second holding piece protrudes less than the second fitting portion toward one side in the axial direction from the second connecting portion,

[0119] a gap is formed between the first holding piece and the second holding piece.

[0120] (4) The ratchet-type clutch device according to (2) or (3), wherein

[0121] the first holder is configured by a plurality of partial first holders obtained by cutting the first holding piece,

[0122] the partial first holder has:

[0123] the first fitting portion;

[0124] a pair of first holding tabs, which are portions of the first holding piece cut, disposed on both sides in the circumferential direction of the first fitting portion, and

[0125] a pair of the first connecting portions connecting the first fitting portion and the pair of the first holding tabs,

[0126] a gap is formed between the first holding tabs of the partial first holders disposed adjacent to each other in the circumferential direction,

[0127] the second holder is configured by a plurality of partial second holders obtained by cutting the second holding piece,

[0128] the partial second holder has:

[0129] the second fitting portion;

[0130] a pair of second holding pieces which are parts of the second holding piece cut off from the second fitting portion, disposed on both sides in the circumferential direction from the second fitting portion; and

[0131] a pair of second connecting portions connecting the second fitting portion and the pair of second holding pieces,

[0132] the second holding pieces of the part of the second holder disposed adjacent in the circumferential direction are formed with a gap between them.

[0133] (5) The ratchet-type clutch device according to any one of (2) to (4), wherein

[0134] the fitting portion has:

[0135] an inner side surface facing a radially inner side and opposing the claw portion;

[0136] an outer side surface facing a radially outer side and opposing an inner surface of the fitted portion;

[0137] a through-hole passing through the inner side surface and the outer side surface;

[0138] a spring housed in the through-hole and applying a radially inward force to the claw portion; and

[0139] a seat occluding the radially outer side of the through-hole.

[0140] (6) The ratchet-type clutch device according to (5), wherein

[0141] a plurality of the claw members have:

[0142] a first claw member disposed on one side of the circumferential direction of the fitting portion; and

[0143] a second claw member disposed on the other side of the circumferential direction of the fitting portion, the spring having:

[0144] a first spring applying a force to the first claw member; and

[0145] a second spring applying a force to the second claw member,

[0146] the through-hole has:

[0147] a first through-hole for housing the first spring; and

[0148] a second through-hole for housing the second spring,

[0149] the seat has:

[0150] a first seat occluding the first through-hole; and

[0151] a second seat that obstructs the second through-hole,

[0152] The first seat and the second seat differ in shape when viewed from the radially outer side.

Claims

1. A ratchet clutch device comprising: outer ring; and The inner ring is coaxially arranged with the central axis of the outer ring and has a plurality of teeth on its outer peripheral surface. The direction parallel to the central axis is defined as the axial direction. The outer ring has: annular outer ring body; a plurality of claw members disposed on the inner circumference of the outer ring body; and A retainer is arranged on the inner circumference side of the outer ring body and holds the claw member. The inner circumference of the outer ring body is formed with: a plurality of engaged portions, recessed radially outward and arranged to be separated from each other in the circumferential direction; and A plurality of shaft receiving portions are recessed radially outward and arranged on both sides of the engaged portion in the circumferential direction. The claw member has: a shaft portion, disposed in the shaft accommodating portion; and a claw portion protruding from the shaft portion, The retainer has: A plurality of engaging portions engaged with the engaged portion; a plurality of retaining pieces covering the inner circumference of the shaft receiving portion and being separated from the fitting portion to form an opening between the retaining pieces and the fitting portion for the claw portion to pass through; a plurality of first connecting portions, arranged on one side in the axial direction relative to the opening, connecting the fitting portion and the holding piece; and A plurality of second connecting portions are arranged on the other side of the axial direction relative to the opening, connecting the fitting portion and the holding piece. The retainer is composed of a first retainer and a second retainer divided from a central portion in the axial direction toward one side and the other side in the axial direction.

2. The ratchet clutch device according to claim 1, wherein: The first retainer has: a first fitting portion constituting one side from the central portion in the axial direction of the fitting portion; a first holding piece constituting the other side from the central portion in the axial direction of the holding piece; and a plurality of said first connecting parts, The second retainer has: a second fitting portion constituting one side from the central portion in the axial direction of the fitting portion; a second retaining piece constituting the other side from the central portion in the axial direction of the retaining piece; and A plurality of second connecting parts.

3. The ratchet clutch device according to claim 2, wherein: The first holding piece protrudes from the first connecting portion to the other side in the axial direction less than the first fitting portion. The second holding piece protrudes from the second connecting portion to one side in the axial direction less than the second fitting portion. A gap is formed between the first holding piece and the second holding piece.

4. The ratchet clutch device according to claim 2 or 3, wherein: The first retainer is composed of a plurality of first retainer parts formed by cutting the first retaining piece. The first retainer has: the first engaging portion; a pair of first retaining short pieces, which are cut-off portions of the first retaining piece and are disposed on both sides of the first fitting portion in a circumferential direction; as well as A pair of the first connecting parts connects the first fitting part and the pair of the first retaining short pieces. A gap is formed between the first retaining short pieces of the part of the first retainer arranged adjacent to each other in the circumferential direction. The second retainer is composed of a plurality of partial second retainers formed by cutting the second retaining piece. The partial second retainer has: the second engaging portion; a pair of second retaining short pieces, which are cut-off portions of the second retaining piece and are arranged on both sides of the second fitting portion in the circumferential direction; as well as A pair of second connecting parts connects the second fitting part and the pair of second retaining short pieces. A gap is formed between the second retaining short pieces of the portion of the second retainer that are arranged adjacent to each other in the circumferential direction.

5. The ratchet clutch device according to claim 4, wherein: The fitting portion has: an inner side surface facing radially inward and opposite to the claw portion; an outer side surface facing radially outward and opposite to the inner surface of the engaged portion; a through hole, penetrating the inner side surface and the outer side surface; a spring, accommodated in the through hole, for applying force to the claw portion radially inward; as well as The pedestal blocks the radially outer side of the through hole.

6. The ratchet clutch device according to claim 5, wherein: The plurality of claw members have: a first claw member disposed on one side of the circumferential direction of the fitting portion; as well as The second claw member is arranged on the other side of the circumferential direction of the fitting portion, The spring has: a first spring, applying force to the first claw member; as well as A second spring applies force to the second claw member, The through hole has: a first through hole for accommodating the first spring; as well as The second through hole is used to accommodate the second spring. The pedestal has: a first seat, blocking the first through hole; as well as The second pedestal blocks the second through hole. The first pedestal and the second pedestal have different shapes when viewed from the outside in the radial direction.

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