one-way clutch

Abstract

The present disclosure provides a one-way clutch that enables simplification of a mold and improvement of productivity. The cam of the one-way clutch has an outer side surface opposite to an outer ring and a groove portion cut in the outer side surface in the circumferential direction. The retainer has a retainer main body made of resin. The retainer main body has a first side plate in the shape of a ring and a plurality of protruding portions protruding from the first side plate. The protruding portions have a plurality of column portions and at least one or more spring-use protruding portions on which a spring is to be mounted on the outer peripheral side. A window portion in which the cam is to be arranged is formed between two column portions adjacent in the circumferential direction. One of the axial directions of the window portion is closed by the first side plate, and the other of the axial directions is open. A hook portion is formed in the spring-use protruding portion, the hook portion protruding to the radially outer side and being arranged at the other of the axial directions than the spring. A notch is formed in the first side plate, the notch being cut in a portion opposite to the hook portion in the axial direction.

Description

Technical Field

[0001] This disclosure relates to a one-way clutch. Background Technology

[0002] A one-way clutch is positioned between an outer ring and an inner ring arranged coaxially. When the outer ring rotates in one direction, the one-way clutch transmits torque from the outer ring to the inner ring. Conversely, when the outer ring rotates in the other direction, the one-way clutch does not transmit torque from the outer ring to the inner ring, and the outer ring spins freely. There are various types of one-way clutches. The one-way clutch described in the following patent document has multiple cams arranged circumferentially, a retainer for holding the cams, and an annular spring mounted on the outer periphery of the cams. This type of one-way clutch is sometimes referred to as a cam clutch.

[0003] Furthermore, the retainer described in the following patent document comprises a pair of side plates and a plurality of pillars. The pair of side plates are formed in a ring shape and are spaced apart axially. The plurality of pillars extend axially between the pair of side plates and are arranged separately in the circumferential direction. Thus, a quadrilateral frame is formed by two circumferentially adjacent pillars and the pair of side plates. Furthermore, the interior of the frame constitutes a window, and a cam is disposed radially outward of the window.

[0004] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2024-041462 Furthermore, retainers are sometimes manufactured by resin injection molding. When manufacturing such retainers by resin injection molding, in addition to a mold that is movable in the axial direction, a mold that is movable in the radial direction is also needed to form the area around the window. Therefore, the mold becomes complex, and a retainer that simplifies the mold process is desired.

[0005] Furthermore, in the assembly of the one-way clutch, the cams are individually configured and fixed to the window from the radially outer side. Next, a spring is mounted on the outer periphery of the cam. This process of individually configuring and fixing the cams to the window leads to a decrease in productivity. Summary of the Invention

[0006] This disclosure was made in view of the above-mentioned problems, and its purpose is to provide a one-way clutch that can simplify mold making and improve productivity.

[0007] To achieve the above objectives, one embodiment of the present disclosure provides a one-way clutch comprising: a plurality of cams disposed between an outer ring and an inner ring, arranged circumferentially; a retainer holding the plurality of cams; and an annular spring mounted on the outer peripheral side of the plurality of cams. Each cam has: an outer surface facing radially outward, opposite the outer ring; and a groove formed by circumferentially cutting the outer surface to accommodate the spring. The direction parallel to the central axis of the outer ring is defined as the axial direction. The retainer has a resin retainer body. The retainer body has: an annular first side plate disposed on one side of the axial direction relative to the plurality of cams; and a plurality of protrusions projecting from the first side plate to the other side of the axial direction, arranged circumferentially. Each protrusion has: a plurality of pillars arranged circumferentially; and at least one spring protrusion mounted on the outer peripheral side for the spring. A window for cam placement is formed between two adjacent pillars in the circumferential direction. One side of the window in the axial direction is closed by the first side plate, and the other side of the window is open. A hook is formed on the spring protrusion, the hook protruding radially outward and positioned on the opposite side of the spring along the axial direction. A cut is formed on the first side plate to cut through the portion opposite the hook in the axial direction.

[0008] Invention Effects In the retainer body of this disclosure, the window portion has an opening on the other side of the axial direction. Therefore, multiple cams arranged circumferentially and springs mounted on the outer periphery of the cams can be assembled into the retainer body from the other side of the axial direction. This saves the time of individually configuring and fixing the cams to the window portion, increasing productivity. Furthermore, the movement of the springs in the other direction of the axial direction is restricted by a hook. Also, when a load is applied to the cams in the other direction of the axial direction, the springs hook onto the inner surface of the slot, preventing the cams from falling off. Moreover, the window portion has an opening on the other side of the axial direction. The hook has a cutout on one side of the axial direction. Therefore, the retainer body of this disclosure can be manufactured using an axially movable mold, simplifying the mold design. Attached Figure Description

[0009] Figure 1 This is a diagram showing the one-way clutch of Embodiment 1 viewed from the axial direction.

[0010] Figure 2 From Figure 1 The diagram when viewed in the direction of arrow II.

[0011] Figure 3 This is a diagram showing the roller of Embodiment 1 viewed from the outer peripheral side.

[0012] Figure 4 A diagram showing the cam of Embodiment 1 viewed from a second direction.

[0013] Figure 5 This is a diagram of the cam as seen from the second direction when the outer ring rotates in the second rotational direction.

[0014] Figure 6 This is a diagram of the cam as seen from the second direction when the outer ring rotates in the first rotation direction.

[0015] Figure 7 This is a diagram showing the holder body of Embodiment 1 viewed from a second direction.

[0016] Figure 8 From Figure 7 A magnified view when viewed in the direction of arrow VIII.

[0017] Figure 9 yes Figure 8 The arrow IX-IX line is used to view the sectional view.

[0018] Figure 10 From Figure 7 A magnified view when viewed in the X direction (arrow X).

[0019] Figure 11 This is a diagram showing the assembly steps of the one-way clutch in Embodiment 1.

[0020] Figure 12 This is a diagram of the retainer (retainer body) of variant example 1 viewed from the second direction.

[0021] Figure 13 yes Figure 12 Sectional view along line XIII-XIII.

[0022] Figure 14 From Figure 12 The diagram when viewed in the direction of arrow XIV.

[0023] Figure 15 This is a diagram of the retainer body of modified example 2 viewed from the second direction.

[0024] Figure 16 yes Figure 15 XVI-XVI line sectional view.

[0025] Figure 17 From Figure 15 The diagram when viewed in the direction of arrow XVII.

[0026] Figure 18 This is a diagram showing the one-way clutch of modified example 3 viewed from the outer peripheral side.

[0027] Figure 19 This is a diagram showing the disassembled state of the retainer in modified example 3 as viewed from the outer periphery.

[0028] Figure 20 This is a diagram of the retainer body of modified example 3 viewed from the second direction.

[0029] Figure 21 This is a diagram of the second side plate of modified Example 3 viewed from the first direction.

[0030] Figure 22 This is a diagram illustrating the welding method between the retainer body and the second side plate in Modified Example 3.

[0031] Figure 23 This is a diagram of the retainer in modified example 4 viewed from the second direction.

[0032] Figure 24 This is a diagram of the retainer in modified example 4, viewed from the outer periphery.

[0033] Explanation of reference numerals in the attached figures 1: Roller; 2: Cam; 3: Retainer; 4: Spring; 5: Window; 6: Opening; 7: Hook; 11: First Groove; 26: Second Groove; 35: Bottom Surface; 28: Protrusion; 30, 30A, 30B, 30C, 30D: Retainer Body; 31: First Side Plate; 38: Protrusion; 40: Projection; 41: Column; 43: First Column; 44: Second Column (Spring Protrusion); 45, 53: Outer Surface; 50: Bearing Part; 51: Inner 52: Outer ring receiving part (spring protrusion); 54, 71: Restricting surface; 56, 57: Outer flange; 58: Second outer flange; 60: Inner flange; 75, 80: Second side plate; 76: Through hole; 100, 100A, 100B, 100C: One-way clutch; 110: Outer ring; 120: Inner ring; 131: Long side plate; 132: Short side plate; 200: Mold; 201: First mold; 202: Second mold; 300: Fixture. Detailed Implementation

[0034] The embodiments for carrying out this disclosure will be described in detail with reference to the accompanying drawings. This disclosure is not limited to the contents described below. Furthermore, the constituent elements described below include substantially the same constituent elements that are readily conceived by those skilled in the art. Moreover, the constituent elements described below can be appropriately combined.

[0035] (Implementation Method 1) Figure 1 This is a diagram showing the one-way clutch of Embodiment 1 viewed from the axial direction. Figure 2 From Figure 1 The diagram shows the view when viewed in the direction of arrow II. First, the outer ring 110 and inner ring 120, which are used for assembling the one-way clutch 100, will be explained. (See diagram below.) Figure 1As shown, the outer ring 110 is an annular component that rotates around the central axis O. The inner ring 120 is arranged coaxially with the outer ring 110 on the inner circumference of the outer ring 110. The inner circumferential surface 111 of the outer ring 110 and the outer circumferential surface 121 of the inner ring 120 are opposite to each other. The distance between the inner circumferential surface 111 and the outer circumferential surface 121 is R1. Furthermore, torque is transmitted to the outer ring 110 through a power transmission component (not shown), causing the outer ring 110 to rotate.

[0036] In the following description, the direction parallel to the central axis O of the outer ring 110 is referred to as the axial direction. For example... Figure 2 As shown, one of the axial directions is called the first direction X1, and the other axial direction is called the second direction X2. The direction orthogonal to the central axis O is called the radial direction. Regarding the direction of rotation about the central axis O, as follows... Figure 1 As shown, the case of the one-way clutch 100 viewed from the second direction X2 is taken as a reference. The clockwise direction (right-hand rotation) when viewed from the second direction X2 is called the first rotation direction L1. The counterclockwise direction (left-hand rotation) when viewed from the second direction X2 is called the second rotation direction L2.

[0037] like Figure 1 , Figure 2 As shown, the one-way clutch 100 of Embodiment 1 includes a plurality of rollers 1, a plurality of cams 2, a retainer 3, and a spring 4. Furthermore, the one-way clutch 100 is disposed between an outer ring 110 and an inner ring 120.

[0038] like Figure 1 As shown, roller 1 is a cylindrical component. The diameter of roller 1 is R1 (refer to...). Figure 1 Furthermore, roller 1 abuts against the inner circumferential surface 111 of outer ring 110 and the outer circumferential surface 121 of inner ring 120. In this embodiment, four rollers 1 are provided. The four rollers 1 are arranged at 90° intervals. Therefore, the distance between the inner circumferential surface 111 and the outer circumferential surface 121 is R1 at any point in the circumferential direction, and outer ring 110 and inner ring 120 are arranged coaxially.

[0039] Figure 3 This is a diagram showing the rollers of Embodiment 1 viewed from the outer periphery. (See diagram below.) Figure 3 As shown, a first groove 11 is formed in the axial center of the outer peripheral surface 10 of the roller 1, recessed towards the central axis O1 of the roller 1. The first groove 11 surrounds the central axis O1 of the roller 1. That is, the first groove 11 is annular. Therefore, even when the roller 1 rotates between the outer ring 110 and the inner ring 120, the first groove 11 always opens radially outward. Hereinafter, the axial center of the roller 1, which has a minor diameter through the first groove 11, will be referred to as the minor diameter portion 12.

[0040] like Figure 2 As shown, the spring 4 is accommodated in the first groove 11. Figure 1 As shown, the spring 4 abuts against the small diameter portion 12 from the radially outer side, exerting a force on the roller 1 radially inward.

[0041] Figure 4 This is a diagram showing the cam of Embodiment 1 viewed from the second direction. Figure 5 This is a diagram of the cam as seen from the second direction when the outer ring rotates in the second rotational direction. Figure 6 This is a diagram of the cam as seen from the second direction when the outer ring rotates in the first rotation direction.

[0042] like Figure 1 As shown, there are three cams 2 arranged between each roller 1, for a total of 12 cams. Figure 4 As shown, the cam 2 has an arcuate surface 20 facing radially inward and an outer surface 21 facing radially outward. The arcuate surface 20 is formed in an arc shape with the central axis O2 as the center. The outer surface 21 has an R-shaped top 23, a first surface 24 arranged from the top 23 along a first rotation direction L1, and a second surface 25 arranged from the top 23 along a second rotation direction L2.

[0043] When the torque is not transmitted to the outer ring 110, the top 23 abuts against the inner circumferential surface 111 of the outer ring 110. When the outer ring 110 rotates in the second rotation direction L2, the top 23 is pressed by the outer ring 110 in the second rotation direction L2. As a result, the cam 2 moves to the left about the central axis O2 (refer to...). Figure 4 Arrow A1) rotates. And, as... Figure 5 As shown, the first surface 24 of the cam 2 abuts against the inner circumferential surface 111 of the outer ring 110, and the cam 2 is sandwiched between the outer ring 110 and the inner ring 120. Furthermore, since all the cams 2 are sandwiched between the outer ring 110 and the inner ring 120, the inner ring 120 is fixed. Therefore, the inner ring 120 rotates together with the outer ring 110 in the second rotational direction L2.

[0044] On the other hand, such as Figure 4 As shown, when the outer ring 110 rotates from a state where the top 23 abuts against the inner circumferential surface 111 of the outer ring 110 towards the first rotation direction L1, the top 23 is pressed by the outer ring 110 towards the first rotation direction L1. Therefore, the cam 2 rotates to the right about the central axis O2 (refer to...). Figure 4 Arrow A2) rotates. Therefore, as... Figure 6 As shown, the second surface 25 is opposite to the inner circumferential surface 111 of the outer ring 110. Here, the distance R2 from the contact portion 20a with the inner ring 120 to the second surface 25 in the arc surface 20 is less than the distance R1 between the outer ring 110 and the inner ring 120 (refer to...). Figure 1 Therefore, cam 2 will not be clamped between outer ring 110 and inner ring 120, and outer ring 110 will spin freely.

[0045] A second groove 26 is formed at the axial center of the outer surface 21, recessed toward the central axis O2 of the cam 2 (see reference). Figure 2 It should be noted that, in this disclosure, the second groove 26 is sometimes simply referred to as the "groove". For example... Figure 4 As shown, the second groove 26 extends circumferentially. Therefore, the bottom surface 27 of the second groove 26 also extends circumferentially. The spring 4 is accommodated in the second groove 26.

[0046] A protrusion 28 protruding radially outward is formed on the bottom surface 27. The protrusion 28 is positioned further away from the central axis O2 in the second rotational direction L2. With the top 23 abutting against the inner circumferential surface 111 of the outer ring 110, the protrusion 28 abuts against the spring 4.

[0047] like Figure 5 As shown, with the first surface 24 abutting against the inner circumferential surface 111 of the outer ring 110, the bottom surface 27 (protrusion 28) does not abut against the spring 4. On the other hand, as... Figure 6 As shown, with the second surface 25 facing the inner circumferential surface 111 of the outer ring 110, the protrusion 28 lifts the spring 4 radially outward. Therefore, the protrusion 28 receives a force applied radially inward from the spring 4. As a result, the cam 2 rotates to the left about the central axis O2 (refer to arrow A3). Thus, the cam 2 returns to the state where the top 23 abuts against the inner circumferential surface 111 of the outer ring 110 (refer to...). Figure 4 ).

[0048] Figure 7 This is a diagram showing the holder body of Embodiment 1 viewed from a second direction. Figure 8 From Figure 7 A magnified view when viewed in the direction of arrow VIII. Figure 9 yes Figure 8 The arrow IX-IX line is used to view the sectional view. Figure 10 From Figure 7 A magnified view when viewed in the X direction (arrow X).

[0049] like Figure 7 As shown, the retainer 3 in this embodiment consists only of a retainer body 30. The retainer body 30 has an annular first side plate 31 and a plurality of protrusions 40 protruding from the first side plate 31 in a second direction X2. The retainer body 30 is formed of resin material, and the first side plate 31 and the plurality of protrusions 40 are integrally formed.

[0050] The first side plate 31 is disposed in a first direction X1 relative to the plurality of rollers 1 and the plurality of cams 2 (see reference). Figure 2 The first side plate 31 has a first side surface 31a facing the first direction X1 (not shown in the figure). See reference Figures 8 to 10), a second side surface 31b facing the second direction X2, an inner peripheral surface 32 facing the radially inward side, and an outer peripheral surface 33 facing the radially outward side.

[0051] The inner circumferential surface 32 and the outer circumferential surface 33 are circular about the central axis O. The diameter of the inner circumferential surface 32 is larger than the diameter of the outer circumferential surface 121 of the inner ring 120. The diameter of the outer circumferential surface 33 is smaller than the diameter of the inner circumferential surface 111 of the outer ring 110. Therefore, the inner circumferential surface 32 does not contact the outer circumferential surface 121 of the inner ring 120 (see reference). Figure 1 Furthermore, the outer peripheral surface 33 does not contact the inner peripheral surface 111 of the outer ring 110 (see reference). Figure 1 ).

[0052] like Figure 7 As shown, a cut 34 is formed in the first side plate 31 by cutting through the radially outer edge of the first side plate 31. The cut 34 is quadrilateral when viewed axially. Four cuts 34 are provided at 90° intervals. Figure 8 , Figure 9 As shown, the inner surface of the cut 34 has a bottom surface 35 facing radially outward, a first side surface 36 facing the first rotation direction L1, and a second side surface 37 facing the second rotation direction L2. Figure 9 (Not shown in the image).

[0053] like Figure 7 As shown, multiple protrusions 40 are spaced apart and arranged circumferentially. Each protrusion 40 is composed of multiple pillars 41. The pillars 41 are arranged at equal intervals in the circumferential direction. Furthermore, a window 5 is formed between two adjacent pillars 41 in the circumferential direction, extending radially through the window 5. Rollers 1 and cams 2 are arranged radially outward from the window 5 (see reference). Figure 1 The size of the window portion 5 (the circumferential spacing of the column portion 41) is smaller than the diameter of the roller 1 and the cam 2. Therefore, the roller 1 and the cam 2 will not pass through the window portion 5 and fall radially inward.

[0054] like Figure 10 As shown, the end 41a of the column portion 41 in the first direction X1 is connected to the second side 31b of the first side plate 31. That is, the first direction X1 of the window portion 5 is closed by the first side plate 31. Therefore, the roller 1 and the cam 2 will not move from the window portion 5 towards the first direction X1 and fall off. On the other hand, the end 41b of the column portion 41 in the second direction X2 has no connection. That is, the second direction X2 of the window portion 5 is not configured with any structure and becomes the opening 6.

[0055] like Figure 2As shown, the axial length of the column portion 41 is less than the axial length of the roller 1 and the cam 2. Therefore, a portion of the roller 1 and a portion of the cam 2 are arranged from the opening 6 along the second direction X2. That is, a portion of the roller 1 and a portion of the cam 2 are arranged closer to the second direction X2 than the end 41b of the column portion 41 at the second direction X2.

[0056] like Figure 7 As shown, a portion of the plurality of column portions 41 is formed with a hook portion 7 protruding radially outward. Hereinafter, the column portion 41 without the hook portion 7 is referred to as the first column portion 43, and the column portion with the hook portion 7 is referred to as the second column portion 44.

[0057] There are four second pillar portions 44, the same number as the cutouts 34. The second pillar portions 44 are arranged at 90° intervals. Alternatively, the circumferential position of the second pillar portions 44 is configured not to overlap with the cutouts 34. Furthermore, there are three first pillar portions 43 arranged between each of the second pillar portions 44.

[0058] like Figure 8 , Figure 9 As shown, the second column portion 44 has an outer surface 45 facing radially outward. The outer surface 45 is disposed on a surface 43a that is radially outward from the first column portion 43 (see reference). Figure 7 ( ) Near the radial outer side. Furthermore, spring 4 is mounted on the outer periphery of the outer side 45 (refer to...) Figure 2 It should be noted that in Embodiment 1, the second column portion 44 is equivalent to a "spring protrusion".

[0059] like Figure 9 As shown, the bottom surface 35 of the cut 34 is disposed in the first direction X1 of the outer surface 45 of the second column 44. The outer surface 45 and the bottom surface 35 of the second column 44 are flush. That is, there is no height difference between the outer surface 45 and the bottom surface 35, and the outer surface 45 and the bottom surface 35 are continuous in the axial direction.

[0060] The hook portion 7 is disposed at the end 41b of the second column portion 44 in the second direction X2. The outer surface 70 of the hook portion 7 facing radially outward has the same diameter as the outer peripheral surface 33 of the first side plate 31. Therefore, the hook portion 7 does not contact the inner peripheral surface 111 of the outer ring 110.

[0061] Furthermore, the hook portion 7 has a limiting surface 71 facing the first direction X1. This limiting surface 71 is positioned closer to the second direction X2 than the first groove portion 11 of the roller 1 and the second groove portion 26 of the cam 2 (see reference). Figure 2 ).like Figure 8 As shown, the thickness H1 of the hook 7 is less than the width H2 of the cut 34.

[0062] Spring 4 uses a garter spring. For example... Figure 2As shown, spring 4 is mounted on the outer periphery of each roller 1, the outer periphery of each cam 2, and the outer periphery of the second column 44. Furthermore, spring 4, with its diameter expanded beyond its natural length, is mounted on the outer periphery of each cam 2 and the outer periphery of the second column 44. That is, spring 4 applies force by pressing each cam 2 radially inward.

[0063] like Figure 2 As shown, the portion of spring 4 mounted on the second post 44 is positioned in the first direction X1 of the hook 7. Therefore, when a load is applied to spring 4 in the second direction X2, spring 4 will hook onto the limiting surface 71 of the hook 7, and its movement will be restricted. Thus, spring 4 will not detach from the second post 44 (retainer body 30).

[0064] like Figure 2 As shown, spring 4 is housed in the first groove 11 of roller 1 and the second groove 26 of cam 2. Therefore, when a load in the second direction X2 is applied to roller 1, spring 4 hooks onto the inner surface of the first groove 11. Thus, the movement of roller 1 in the second direction X2 is restricted. Similarly, when a load in the second direction X2 is applied to cam 2, spring 4 hooks onto the inner surface of the second groove 26. Thus, the movement of cam 2 in the second direction X2 is restricted. Based on the above, the window portion 5 of this embodiment has an opening 6 that opens in the second direction X2, but this prevents roller 1 and cam 2 from falling off.

[0065] Next, the manufacturing method of the retainer body 30 will be described. The retainer body 30 is manufactured by resin injection molding. The resin injection molding uses a mold 200 that is movable in the axial direction. The mold 200 has a first mold 201 (see reference) disposed relative to the cavity (retainer body 30) in the first direction X1. Figure 8 , Figure 9 And a second mold 202 disposed in the second direction X2 relative to the cavity (retainer body 30) (see reference). Figure 10 ).

[0066] like Figure 8 , Figure 9 As shown, the first mold 201 shapes the first side surface 31a of the first side plate. Furthermore, the first mold 201 shapes the inner surface (bottom surface 35, first side surface 36, second side surface 37) of the cut 34, the outer side surface 45 of the second pillar 44, the outer side surface 70 of the hook 7, and the limiting surface 71. After the resin in the cavity cures, the first mold 201 moves in the first direction X1. That is, a portion of the first mold 201 passes through the cut 34 and moves in the first direction X1.

[0067] In addition, such as Figure 10As shown, a portion of the second mold 202 shapes the second side surface 31b of the first side plate 31 and the circumferential sides of the protrusions 40 (first pillar 43 and second pillar 44). After the resin in the cavity cures, a portion of the second mold 202 moves through the opening 6 in the second direction X2. Based on the above, the retainer body 30 is manufactured by an axially movable mold 200.

[0068] Figure 11 This diagram illustrates the assembly steps of the one-way clutch according to Embodiment 1. Next, the assembly method of the one-way clutch 100 will be described. The assembly steps of the one-way clutch 100 are as follows: Figure 11 As shown, a clamp 300 is used. The clamp 300 is a cylindrical component. The diameter of the clamp 300 is smaller than the inner diameter of the retainer body 30. That is to say, the clamp 300 can be inserted into the inner circumference of multiple pillars 41.

[0069] A spring 4 is attached to the outer circumferential surface of the clamp 300. Then, a plurality of rollers 1 and a plurality of cams 2 are arranged between the clamp 300 and the spring 4. Furthermore, the spring 4 is configured to be received in a first groove 16 of the roller 1 and a second groove 26 of the cam 2. Accordingly, as... Figure 11 As shown, multiple rollers 1 and multiple cams 2 are arranged circumferentially on the outer peripheral surface of the clamp 300. Furthermore, a spring 4 is mounted on the outer peripheral side of the multiple rollers 1 and multiple cams 2. It should be noted that, in this disclosure, grooves may also be formed on the outer peripheral surface of the clamp 300 to position the rollers 1 and cams 2 in a manner that prevents them from moving circumferentially.

[0070] Next, the clamp 300 is inserted into the inner circumference of the retainer body 30 from the second direction X2 (see reference). Figure 11 (Arrow B). Accordingly, roller 1 and cam 2 are arranged radially outward of window portion 5, passing through opening 6. Furthermore, when clamp 300 is inserted, spring 4 hooks onto hook portion 7, thus deforming spring 4 radially outward, passing over hook portion 7. Then, spring 4 is hooked onto the outer periphery of second column portion 44. Finally, clamp 300 is moved axially, separating multiple rollers 1, multiple cams 2, and spring 4 from clamp 300. Thus, one-way clutch 100 is completed.

[0071] According to Embodiment 1, in the assembly of the one-way clutch 100, multiple rollers 1, multiple cams 2, and springs 4 can be assembled together on the retainer body 30. Therefore, the effort of individually arranging and fixing the cams 2, etc., to the window portion 5 can be saved, increasing productivity. Furthermore, the mold 200 for manufacturing the retainer body 30 is composed of a first mold 201 and a second mold 202 that are axially movable. Therefore, the mold 200 can be simplified.

[0072] Furthermore, the first groove 11 of roller 1 and the second groove 26 of cam 2 are located at the central portion in the axial direction. If the first groove 11 is provided at the end of roller 1 in the second direction X2, the central axis O1 of roller 1 will tilt. As a result, the surface pressure on a portion of roller 1 will increase, and the lifespan of roller 1 will be shortened. It should be noted that if the second groove 26 is provided at the end of cam 2 in the second direction X2, the central axis O2 of cam 2 will tilt, and the lifespan of cam 2 will be shortened. Therefore, according to this embodiment 1, since roller 1 and cam 2 do not tilt, roller 1 and cam 2 can be used for a long time.

[0073] While Embodiment 1 has been described above, this disclosure is not limited to the examples described in Embodiment 1. For instance, in Embodiment 1, torque is input to the outer ring 110 of the outer ring 110 and the inner ring 120, but in this disclosure, torque may also be input to the inner ring 120. Furthermore, the number and arrangement of the rollers 1 and the cams 2 are not limited to the number and arrangement exemplified in Embodiment 1.

[0074] Furthermore, in Embodiment 1, the first groove 11 is disposed at the central portion of the roller 1 in the axial direction, but in this disclosure, it may also be disposed outside the central portion of the roller 1 in the axial direction. That is, the first groove 11 may also be disposed at the end of the roller 1 in the first direction X1 and the end of the roller 1 in the second direction X2. Similarly, the second groove 26 of this disclosure may also be disposed at the end of the cam 2 in the first direction X1 and the end of the cam 2 in the second direction X2.

[0075] Furthermore, in Embodiment 1, the hook 7 is disposed at the end of the spring protrusion (second post 44) in the second direction X2, but in this disclosure, it can also be disposed elsewhere than the end of the spring protrusion in the second direction X2. As long as the hook 7 is disposed in the second direction X2 relative to the spring 4 mounted on the spring protrusion, the spring 4 can be prevented from falling off. Therefore, as long as the hook 7 is disposed closer to the spring 4 in the second direction X2, there is no particular limitation on the axial position formed on the spring protrusion.

[0076] Furthermore, the protrusion 40 in Embodiment 1 is composed of a column portion 41 (a first column portion 43 and a second column portion 44), but the protrusion of this disclosure may also have a bearing portion. In the following Modification 1, the retainer body 30 having a bearing portion will be described. It should be noted that in the following description, the differences from Embodiment 1 will be focused on.

[0077] (Variation Example 1) Figure 12 This is a diagram of the retainer (retainer body) of variant example 1 viewed from the second direction. Figure 13 yes Figure 12 Sectional view along line XIII-XIII. Figure 14 From Figure 12 The diagram when viewed in the direction of arrow XIV.

[0078] like Figure 12 As shown, in Modified Example 1, the retainer body 30A has a bearing portion 50 instead of the second column portion 44 (see reference). Figure 7 This differs from the retainer body 30 of Embodiment 1. That is, the protrusion 40 of Embodiment 1 is composed of a first pillar portion 43 and a second pillar portion 44, but the protrusion 40 of Modified Example 1 is composed of a first pillar portion 43 and a bearing portion 50. Furthermore, the retainer body 30A differs from the retainer body 30 of Embodiment 1 in that it has an outer flange 56 protruding radially outward.

[0079] like Figure 13 As shown, the bearing portion 50 has an inner ring receiving portion 51 and an outer ring receiving portion 52 that protrudes radially outward from the inner ring receiving portion 51. The inner ring receiving portion 51 protrudes from the second side surface 31b of the first side plate 31 in a second direction X2. The inner diameter R3 of the inner ring receiving portion 51 is the same as the diameter of the outer peripheral surface 121 of the inner ring 120. Furthermore, the inner surface 51a of the inner ring receiving portion 51 abuts against the outer peripheral surface 121 of the inner ring 120.

[0080] It should be noted that the portion 32a of the inner circumferential surface 32 of the first side plate 31, which is disposed in the inner ring receiving portion 51 in the first direction X1, has the same diameter as the inner surface 51a. Therefore, the portion 32a of the first side plate 31 protrudes radially inward from the inner circumferential surface 32 of the first side plate 31 and abuts against the outer circumferential surface 121 of the inner ring 120.

[0081] The outer diameter R4 of the outer ring receiving portion 52 is the same as the diameter of the inner circumferential surface 111 of the outer ring 110. Furthermore, the outer circumferential surface 52a of the outer ring receiving portion 52 abuts against the inner circumferential surface 111 of the outer ring 110. Figure 12 As shown, there are four bearing sections 50. The four bearing sections 50 are arranged at 90° intervals.

[0082] Based on the above, the distance between the inner circumferential surface 111 and the outer circumferential surface 121 is R1 at any point in the circumference (refer to...). Figure 1 The outer ring 110 and the inner ring 120 are arranged coaxially. Furthermore, in Modified Example 1, since a bearing portion 50 is present, rollers are unnecessary. That is, the one-way clutch 100A of Modified Example 1 does not have rollers 1.

[0083] It should be noted that in this embodiment, the inner diameter R3 of the inner ring receiving portion 51 is the same as the diameter of the outer circumferential surface 121 of the inner ring 120. However, in this disclosure, the inner diameter R3 of the inner ring receiving portion 51 may also be larger than the diameter of the outer circumferential surface 121 of the inner ring 120. Furthermore, in this embodiment, the outer diameter R4 of the outer ring receiving portion 52 is the same as the diameter of the inner circumferential surface 111 of the outer ring 110. However, in this disclosure, the outer diameter R4 of the outer ring receiving portion 52 may also be smaller than the diameter of the inner circumferential surface 111 of the outer ring 110.

[0084] like Figure 13 As shown, the inner ring receiving portion 51 has an outer surface 53 facing radially outward. The spring 4 is mounted on the outer periphery of the inner ring receiving portion 51. Therefore, in modified example 1, the bearing portion 50 constitutes a "spring protrusion". Furthermore, the bottom surface 35 of the cutout 34 is disposed in the first direction X1 of the outer surface 53. There is no height difference between the outer surface 53 and the bottom surface 35, and the outer surface 53 and the bottom surface 35 are continuous in the axial direction.

[0085] The outer ring receiving portion 52 is disposed at the end of the inner ring receiving portion 51 in the second direction X2. The outer ring receiving portion 52 has a limiting surface 54 facing the first direction X1. The limiting surface 54 is disposed further in the second direction X2 than the spring 4. When a load is applied to the spring 4 in the second direction X2, the spring 4 hooks onto the limiting surface 54. Therefore, the spring 4 is prevented from falling off the retainer 3. That is, in modified example 1, the outer ring receiving portion 52 constitutes the hook portion 7 of embodiment 1.

[0086] like Figure 12 As shown, window portions 5 are provided on both circumferential sides of the bearing portion 50. Therefore, the bearing portion 50 of Modified Example 1 serves as a frame portion surrounding the window portions 5. Figure 14 As shown, no structure is connected to the end of the bearing portion 50 in the second direction X2. Therefore, the window portions 5 located on both circumferential sides of the bearing portion 50 open in the second direction X2 through the opening portion 6. Based on the above, in modified example 1, the second mold 202 (see reference 1) that is movable in the axial direction can also be used. Figure 10 The second side 31b of the first side plate 31 and the circumferential side of the bearing part 50 are formed.

[0087] Furthermore, the width H3 of the outer ring receiving portion 52 (hook portion 7) is smaller than the width H4 of the cutout 34. Therefore, through the axially movable first mold 201 (refer to...) Figure 8 , Figure 9 It can shape the inner surface (bottom surface 35, first side surface 36 and second side surface 37), outer side surface 53, limiting surface 54 and outer peripheral surface 52a of the cut 34.

[0088] like Figure 13As shown, an outer flange 56 is provided on the outer peripheral surface 33 of the first side plate 31. The outer flange 56 abuts against the outer ring 110 from the first direction X1. Therefore, the movement of the one-way clutch 100A in the second direction X2 is restricted.

[0089] like Figure 14 As shown, a flange slit 57 with the same width H4 as the slit 34 is formed on the outer flange 56. Figure 12 As shown, the flange has four notches 57. Therefore, the outer flange 56 is divided into four sections circumferentially. Furthermore, the first mold 201 (see reference...) Figure 8 , Figure 9 It can pass through the flange cutout 57 after the outer surface 53, the limiting surface 54 and the outer peripheral surface 52a are formed.

[0090] The above describes Modified Example 1. Next, Modified Example 2, which is provided with an inner flange, will be described relative to the retainer body 30A of Modified Example 1.

[0091] (Variation Example 2) Figure 15 This is a diagram of the retainer body of modified example 2 viewed from the second direction. Figure 16 yes Figure 15 XVI-XVI line sectional view. Figure 17 From Figure 15 The diagram shown when viewed in the direction of arrow XVII. (See image below.) Figure 15 As shown, the retainer body 30B of Modified Example 2 differs from the retainer body 30A of Modified Example 1 in that it has an inner flange 60. Furthermore, the retainer body 30B differs from the retainer body 30A of Modified Example 1 in that it has a plurality of radially extending deformation cutouts 61. Figure 15 , Figure 17 As shown, the retainer body 30B of Modified Example 2 differs from the retainer body 30A of Modified Example 1 in that it has first column portions 43 added to both sides of the bearing portion 50.

[0092] like Figure 16 As shown, the inner flange 60 is provided on the inner circumferential surface 32 of the first side plate 31. The inner flange 60 abuts against the inner ring 120 from the first direction X1. Therefore, the movement of the one-way clutch 100B in the second direction X2 is restricted.

[0093] like Figure 15 As shown, the deformation cutout 61 has a first cutout 62 formed by cutting the first side plate 31 and a second cutout 63 formed by cutting the inner flange 60.

[0094] like Figure 17As shown, the first cut 62 extends radially inward from the circumferential portions on both sides of the bottom surface 35 of the first side plate 31. Therefore, in Modified Example 2, the circumferential width H5 of the bottom surface 35 is the same as the width H6 of the outer ring receiving portion 52 (hook portion 7).

[0095] like Figure 15 As shown, the first cut 62 extends to the radially outer side of the inner flange 60, and the first side plate 31 is divided circumferentially. Therefore, in Modified Example 2, the first side plate 31 is divided into four longer side plates 131 in the circumferential direction (see Figure 131). Figure 15 ) and four short-sized side plates 132 with short circumferential length (refer to) Figure 17 ).

[0096] like Figure 15 As shown, four first pillars 43 are connected to the long side plate 131. Furthermore, the long side plate 131 is provided with an outer flange 56. (As shown...) Figure 16 and Figure 17 As shown, a bearing portion 50 is connected to the short side plate 132. Furthermore, the long side plate 131 and the short side plate 132 are connected via an inner flange 60. Figure 15 As shown, the second cut 63 extends radially outward from the radially inner end of the inner flange 60. Furthermore, the second cut 63 extends to a portion near the radially outer end of the inner flange 60.

[0097] As described above, according to Modified Example 2, when the one-way clutch 100B is assembled between the outer ring 110 and the inner ring 120, the retainer body 30B is prone to deformation. Therefore, the assemblability is improved when the one-way clutch 100B is assembled to the outer ring 110, etc.

[0098] The above describes Modification 2. It should be noted that the modified cut 61 in Modification 2 has a first cut 62 and a second cut 63, but this disclosure may only have one of the first cut 62 and the second cut 63, and is not limited to the example described in Modification 2.

[0099] Furthermore, in the above-described embodiment 1, the retainer 3 is composed only of retainer bodies 30, 30A, and 30B. However, the retainer 3 of this disclosure may have other components in addition to the retainer bodies. Hereinafter, modified examples 3 and 4, in which the retainer includes a retainer body and other components, will be described.

[0100] (Variation Example 3) Figure 18 This is a diagram showing the one-way clutch of modified example 3 viewed from the outer peripheral side. Figure 19 This is a diagram showing the state of the retainer of modified example 3 after disassembly, viewed from the outer periphery. Figure 20 This is a diagram of the retainer body of modified example 3 viewed from the second direction. Figure 21This is a diagram showing the second side plate of modified Example 3 viewed from the first direction. (See diagram below.) Figure 18 , Figure 19 As shown, the one-way clutch 100C of Modified Example 3 differs from Embodiment 1 in that the retainer 3 has a retainer body 30C and a second side plate 75.

[0101] like Figure 19 , Figure 20 As shown, the protrusion 40 of the retainer body 30C has a column portion 41 (first column portion 43 and second column portion 44), which is the same as in Embodiment 1. However, the difference from Embodiment 1 is that the axial length of the column portion 41 (first column portion 43 and second column portion 44) in Modified Example 3 is greater than the axial length of the roller 1 and the cam 2. Figure 18 As shown, the end 41b of the column portion 41 in the second direction X2 is positioned closer to the roller 1 and the cam 2 in the second direction X2. Furthermore, the end 41b of the column portion 41 in the second direction X2 is fused to the second side plate 75, and the retainer body 30C and the second side plate 75 are integrated.

[0102] like Figure 19 , Figure 20 As shown, a protrusion 38 protruding in the second direction X2 is formed on the end face of the column portion 41. The protrusion 38 is provided on the end face of the second column portion 44 in the second direction X2 (see reference). Figure 20 Therefore, the protrusions 38 are arranged at 90° intervals, with a total of four. Furthermore, the protrusions 38 are in the shape of a frustum of a cone (see reference). Figure 22 ).

[0103] The second side panel 75 is formed of resin material. For example... Figure 21 As shown, the second side plate 75 is formed in an annular shape. The inner and outer diameters of the second side plate 75 are the same as those of the first side plate 31. A through hole 76 extending axially is formed in the second side plate 75. The through holes 76 are arranged at 90° intervals, and a total of four are provided. Next, the welding method of the retainer body 30C and the second side plate 75 will be described.

[0104] Figure 22 This diagram illustrates the welding method of the retainer body and the second side plate in Modified Example 3. (See diagram for example.) Figure 22 As shown, in the welding method, as the first step S1, the protrusion 38 of the retainer body 30C is axially aligned with the through hole 76 of the second side plate 75. Next, as the second step S2, the top end of the protrusion 38 is inserted into the through hole 76. Thus, the retainer body 30C is positioned relative to the second side plate 75.

[0105] As a third step S3, the protrusion 38 or the retainer body 30C disposed in the through hole 76 from the second direction X2 of the second side plate 75 is vibrated using ultrasound, causing the contact portion between the protrusion 38 and the through hole 76 to melt. As a fourth step S4, the second side plate 75 is pressed against the retainer body 30C. As a result, the molten protrusion 38 is squeezed into the inside of the through hole 76, and the through hole 76 is filled with the molten protrusion 38. Then, the retainer 3 is completed when it is left to stand until the protrusion 38 solidifies.

[0106] It should be noted that when the second side plate 75 is welded to the retainer body 30C, the second direction X2 of the window 5 is closed by the second side plate 75. Therefore, before welding the retainer body 30C to the second side plate 75, the roller 1, cam 2 and spring 4 need to be assembled to the retainer body 30C using the clamp 300.

[0107] In the one-way clutch 100C according to Modified Example 3, the opening 6 is closed by the second side plate 75. Therefore, the roller 1 and the cam 2 will not fall off the retainer 3.

[0108] (Variation Example 4) Figure 23 This is a diagram of the retainer in modified example 4 viewed from the second direction. Figure 24 This is a diagram showing the retainer of modified Example 4 viewed from the outer periphery. (See diagram below.) Figure 23 , Figure 24 As shown, the retainer 3 of variant 4 differs from that of embodiment 1 in that it has a retainer body 30D and a second side plate 80.

[0109] The retainer body 30D is the same as the retainer body 30B in Modified Example 2, having a first column portion 43, a bearing portion 50, an outer flange 56, an inner flange 60, and a cutting notch 61 for modification. However, the axial length of the protrusion 40 (first column portion 43 and bearing portion 50) in Modified Example 4 is greater than the axial length of the roller 1 and the cam 2 compared to Modified Example 2.

[0110] like Figure 23 As shown, the second side plate 80 is arc-shaped when viewed from the axial direction. Four second side plates 80 are provided. The second side plates 80 are positioned in the second direction X2 relative to the elongated side plate 131 of the first side plate 31. Furthermore, the second side plates 80 are fused to the ends of the four first column portions 43 in the second direction. Thus, the retainer body 30D and the second side plates 80 are integrated.

[0111] It should be noted that in modified example 4, when the second side plate 80 is welded to the retainer body 30D, the second direction X2 of the window 5 is closed by the second side plate 80. Therefore, before welding the retainer body 30D and the second side plate 80, the roller 1, cam 2 and spring 4 need to be assembled to the retainer body 30D using the fixture 300.

[0112] like Figure 24 As shown, the second outer flange 58 is formed on the end face of the bearing portion 50 in the second direction X2, which differs from Modified Example 2. The second outer flange 58 protrudes radially outward from the outer peripheral surface 52a of the outer ring receiving portion 52. The second outer flange 58 abuts against the outer ring 110 from the second direction X2. That is, the outer ring 110 is clamped by the outer flange 56 and the second outer flange 58. Therefore, the retainer 3 will not move axially relative to the outer ring.

[0113] The above describes modifications 3 and 4. It should be noted that in modifications 3 and 4, the retainer bodies 30C and 30D are joined to the second side plates 75 and 80 by welding; however, adhesives can also be used in this disclosure, and the joining method between the retainer bodies 30C and 30D and the second side plates 75 and 80 is not particularly limited. Furthermore, in modifications 3 and 4, the resin second side plates 75 and 80 are combined with the resin retainer bodies 30C and 30D; however, metal end bearings can also be combined. In this case, the retainer body and the end bearing are integrated by fitting or placing the end bearing on the outer periphery of the first column portion 43, etc.

[0114] Furthermore, a second outer flange 58 is provided in the bearing portion 50 of Modified Example 4, but in this disclosure, a second outer flange 58 may also be provided in the bearing portion 50 of Modified Example 1 and Modified Example 2.

[0115] It should be noted that this disclosure may also be a combination of the following configurations. (1) A one-way clutch, comprising: Multiple cams are configured between the outer and inner rings and arranged circumferentially; A retainer, holding the plurality of said cams; and A ring-shaped spring is mounted on the outer periphery of the plurality of cams. The cam has: The outer surface, facing radially outward, is opposite to the outer ring; and The groove is formed by cutting the outer side in the circumferential direction to accommodate the spring. The direction parallel to the central axis of the outer ring is defined as the axial direction. The retainer has a retainer body made of resin. The retainer body has: An annular first side plate is disposed on one side of the axial direction relative to the plurality of said cams; and Multiple protrusions, projecting from the first side plate in the opposite direction along the axial direction, are arranged circumferentially. The protrusion has: Multiple columns; and At least one or more spring protrusions are provided on the outer peripheral side for mounting the spring. A window portion for the configuration of the cam is formed between two adjacent column portions in the circumferential direction. One side of the window portion along the axial direction is closed by the first side plate, while the other side along the axial direction is open. A hook is formed on the spring protrusion, the hook protruding radially outward and positioned on the opposite side of the spring from the axial direction. A cut is formed in the first side plate to cut the portion opposite to the hook in the axial direction. (2) According to the one-way clutch described in (1), wherein, The groove is located at the center of the axial direction of the outer side. (3) According to the one-way clutch described in (1) or (2), wherein, The spring is formed into the column portion by a protrusion. The spring protrusion and the column portion form the window portion. (4) The one-way clutch described in (3) has the following features: Multiple rollers are disposed between the outer ring and the inner ring, and abut against the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring. The roller is disposed on the window portion and held in the retainer body. (5) According to the one-way clutch described in (1) or (2), wherein, The spring protrusion is an inner ring receiving part that protrudes from the first side plate in the opposite direction along the axial direction and abuts against the outer peripheral surface of the inner ring. An outer ring receiving portion is formed in the inner ring receiving portion, the outer ring receiving portion protruding radially outward and abutting against the inner circumferential surface of the outer ring. The outer ring receiving part constitutes a hook. (6) According to any one of (1) to (5) a one-way clutch, wherein, The axial length of the protrusion is less than the axial length of the cam. (7) According to any one of (1) to (5) a one-way clutch, wherein, The retainer has a second side plate made of resin formed in a ring shape. The axial length of the protrusion is greater than the axial length of the cam. The second side plate is disposed on the other side of the axial direction relative to the plurality of cams and engages with the other end of the protrusion on the other side of the axial direction.

Claims

1. A one-way clutch, comprising: Multiple cams are configured between the outer and inner rings and arranged circumferentially; A retainer, holding the plurality of said cams; and A ring-shaped spring is mounted on the outer periphery of the plurality of cams. The cam has: The outer surface, facing radially outward, is opposite to the outer ring; and The groove is formed by cutting the outer side in the circumferential direction to accommodate the spring. The direction parallel to the central axis of the outer ring is defined as the axial direction. The retainer has a retainer body made of resin. The retainer body has: An annular first side plate is disposed on one side of the axial direction relative to the plurality of said cams; and Multiple protrusions, projecting from the first side plate in the opposite direction along the axial direction, are arranged circumferentially. The protrusion has: Multiple columns; and At least one or more spring protrusions are provided on the outer peripheral side for mounting the spring. A window portion for the configuration of the cam is formed between two adjacent column portions in the circumferential direction. One side of the window portion along the axial direction is closed by the first side plate, while the other side along the axial direction is open. A hook is formed on the spring protrusion, the hook protruding radially outward and positioned on the opposite side of the spring from the axial direction. A cut is formed in the first side plate to cut the portion opposite to the hook in the axial direction.

2. The one-way clutch according to claim 1, wherein, The groove is located at the center of the axial direction of the outer side.

3. The one-way clutch according to claim 1 or 2, wherein, The spring is formed into the column portion by a protrusion. The spring protrusion and the column portion form the window portion.

4. The one-way clutch according to claim 3, comprising: Multiple rollers are disposed between the outer ring and the inner ring, and abut against the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring. The roller is disposed on the window portion and held in the retainer body.

5. The one-way clutch according to claim 1 or 2, wherein, The spring protrusion is an inner ring receiving part that protrudes from the first side plate in the opposite direction along the axial direction and abuts against the outer peripheral surface of the inner ring. An outer ring receiving portion is formed in the inner ring receiving portion, the outer ring receiving portion protruding radially outward and abutting against the inner circumferential surface of the outer ring. The outer ring receiving part constitutes a hook.

6. The one-way clutch according to claim 1 or 2, wherein, The axial length of the protrusion is less than the axial length of the cam.

7. The one-way clutch according to claim 1 or 2, wherein, The retainer has a second side plate made of resin formed in a ring shape. The axial length of the protrusion is greater than the axial length of the cam. The second side plate is disposed on the other side of the axial direction relative to the plurality of cams and engages with the other end of the protrusion on the other side of the axial direction.

Images