Clutch outer ring and controllable overrunning clutch

Abstract

The present application relates to the clutch technical field, especially a kind of clutch outer ring and controllable overrunning clutch.It includes clutch outer ring and several eccentric rollers, clutch outer ring includes ring body, the axial two sides of ring body are respectively equipped with axial stop structure, at least one axial stop structure is equipped with the positioning hole for with the half shaft of eccentric roller end portion cooperation to carry out centring to eccentric roller, or at least one axial stop structure is equipped with the positioning shaft for with the positioning hole of eccentric roller end portion cooperation to carry out centring to eccentric roller, and at least one axial stop structure is detachably connected with ring body.Eccentric roller is centred by the axial stop structure of clutch outer ring two ends, so that when operating clutch changes from combined state to disengaged state, eccentric roller only swings around clutch outer ring and will not move, and eccentric roller can still be normally reset after removing operating force, so that clutch can be recombined.

Description

TECHNICAL FIELD

[0001] The present application relates to the clutch technical field, especially to a clutch outer ring and a controllable overrunning clutch. BACKGROUND

[0002] The controllable overrunning clutch is different from the conventional overrunning clutch in that the retaining frame can be controlled to rotate the eccentric roller to change from the combined state to the disengaged state. Figure 1 As shown in the drawings, the controllable overrunning clutch comprises a clutch outer ring 1, an outer retaining frame 3, an inner retaining frame 5, a clutch inner ring 6, a plurality of eccentric rollers 2, and a wave spring 4. The eccentric rollers 2 are supported on the inner and outer retaining frames. A plurality of grooves 101 are formed on the inner circumferential surface of the clutch outer ring 1. The wave spring 4 presses the outer arc surface 201 of the eccentric roller in the groove 101. Figure 4 When the controllable overrunning clutch needs to be controlled to change from the combined state to the disengaged state, the retaining frame can be controlled by the turning mechanism to rotate the eccentric roller, so that the inner arc surface 202 of the eccentric roller is disengaged from the clutch inner ring 6, as shown in the drawings, so that the clutch inner ring 6 and the clutch outer ring 1 can freely rotate clockwise or counterclockwise at their respective speeds, realizing the bidirectional disengagement function. Figure 5 When the clutch needs to change from the disengaged state to the combined state, only the torque applied to the retaining frame needs to be removed, and the eccentric roller 2 can be returned to its original position under the restoring force of the wave spring 4, so that the inner arc surface 202 of the eccentric roller is in contact with the clutch inner ring 6, and the clutch regains the combined function, as shown in the drawings. Figure 2 Figure 3 The controllable overrunning clutch is different from the conventional overrunning clutch in that the retaining frame can be controlled to rotate the eccentric roller to change from the combined state to the disengaged state.

[0003] The existing controllable overrunning clutch has the following problems when in use: (1) The inner circumferential surface of the clutch outer ring needs to be machined with a plurality of grooves, which requires high machining process and is difficult to machine; (2) When the retaining frame is controlled to rotate the eccentric roller by the turning mechanism, the eccentric roller will not only swing in the groove of the clutch outer ring but also move, which can easily cause the eccentric roller to be stuck in the space between the grooves and cannot be returned to its original position, resulting in the clutch being unable to be combined normally after changing from the combined state to the disengaged state. SUMMARY

[0004] The present application aims to provide a clutch outer ring to solve the problems of the existing clutch outer ring, such as high machining difficulty and the eccentric roller being easily stuck in the groove of the clutch outer ring when the clutch is controlled to change from the combined state to the disengaged state, resulting in the clutch being unable to be combined normally. The present application also aims to provide a controllable overrunning clutch to solve the problems of the existing controllable overrunning clutch, such as high machining difficulty of the outer ring and the eccentric roller being easily stuck in the groove of the outer ring when the clutch is controlled to change from the combined state to the disengaged state, resulting in the clutch being unable to be combined normally.​

[0005] To achieve the above object, the clutch outer ring adopts the following technical scheme:

[0006] A clutch outer ring comprises a ring body, axial stop structures are arranged on the two axial sides of the ring body, at least one of the axial stop structures is provided with a positioning hole for cooperating with a half shaft of an end portion of an eccentric roller to center the eccentric roller, or at least one of the axial stop structures is provided with a positioning shaft for cooperating with a positioning hole of the end portion of the eccentric roller to center the eccentric roller, and the at least one axial stop structure is detachably connected with the ring body.

[0007] Beneficial effects: The eccentric roller is centered by the axial stop structures at both ends, the axial stop structures are fixedly connected with the ring body, the eccentric roller is kept inside the outer ring by the axial stop structures at both ends, the eccentric roller is in contact with the inner circumferential surface of the ring body, the inner circumferential surface of the ring body is not provided with a groove, and the inner diameter of the ring body is a normal cavity, thereby reducing the machining difficulty of the clutch outer ring; since the at least one axial stop structure is detachably connected with the ring body, the eccentric roller can be centered by first assembling one end of the eccentric roller with the axial stop structure on one side of the ring body and then fixedly connecting the detachable axial stop structure on the other side of the ring body during assembly, so that the eccentric roller only swings around the clutch outer ring and does not move when the clutch is controlled to change from the engaged state to the disengaged state, and the eccentric roller can still normally return after the control force is removed, so that the clutch can be re-engaged.

[0008] Further, both of the axial stop structures are detachably connected with the ring body.

[0009] Beneficial effects: The structure of the ring body is simplified, and assembly is more convenient.

[0010] Further, the axial stop structure is a ring-shaped stop piece, and the ring-shaped stop piece is fixedly and tightly pressed on the end face of the ring body.

[0011] Beneficial effects: The ring-shaped stop piece has a simple structure, is convenient to machine, is tightly in contact with the end face of the ring body, and is more reliable in connection.

[0012] Further, an annular groove is arranged on the inner circumferential surface of the ring-shaped stop piece and is used for limiting one end of a torsion spring of the end portion of the eccentric roller.

[0013] Beneficial effects: The annular groove is arranged on the ring-shaped stop piece, one end of the torsion spring is fixed relative to the end portion of the eccentric roller, and the other end of the torsion spring is tightly pressed in the annular groove, so that the torsion spring is convenient to assemble.

[0014] The controllable overrunning clutch adopts the following technical scheme:

[0015] The controllable overrunning clutch comprises a clutch outer ring and a plurality of eccentric rollers, the clutch outer ring comprises a ring body, axial stop structures are arranged on the two axial sides of the ring body respectively, positioning holes for cooperating with the half shafts of the end portions of the eccentric rollers to center the eccentric rollers are arranged on at least one of the axial stop structures, or positioning shafts for cooperating with the positioning holes of the end portions of the eccentric rollers to center the eccentric rollers are arranged on at least one of the axial stop structures, and the at least one axial stop structure is detachably connected with the ring body.

[0016] Beneficial effects: The eccentric rollers are centered by the axial stop structures at the two ends, the axial stop structures are fixedly connected with the ring body, the eccentric rollers are kept inside the outer ring by the axial stop structures at the two ends, the eccentric rollers are in contact with the inner circumferential surface of the ring body, the inner circumferential surface of the ring body is not provided with grooves, the inner diameter of the ring body is a normal cavity, and thus the machining difficulty of the clutch outer ring is reduced; since the at least one axial stop structure is detachably connected with the ring body, the eccentric rollers can be centered by first assembling one end of the eccentric rollers with the axial stop structure on one side of the ring body and then fixedly connecting the detachable axial stop structure on the other side of the ring body during assembly, so that when the clutch is controlled to change from the engaged state to the disengaged state, the eccentric rollers only swing around the clutch outer ring and cannot move, and the eccentric rollers can still normally return after the control force is removed, so that the clutch can be re-engaged.

[0017] Further, the two axial stop structures are detachably connected with the ring body.

[0018] Beneficial effects: The structure of the ring body is simplified, and assembly is more convenient.

[0019] Further, the axial stop structure is an annular stop piece which is fixedly and tightly pressed on the end face of the ring body.

[0020] Beneficial effects: The annular stop piece has a simple structure, is convenient to machine, is tightly in contact with the end face of the ring body, and is more reliable in connection.

[0021] Further, torsional springs are arranged at the two axial ends of each eccentric roller, an annular groove is arranged on the inner circumferential surface of the annular stop piece, one end of the torsional spring is fixed opposite to the end portion of the eccentric roller, and the other end is tightly pressed in the annular groove of the annular stop piece.

[0022] Beneficial effects: The torsional spring can be twisted in a large range and has a long service life, the annular groove is arranged on the annular stop piece, one end of the torsional spring is fixed opposite to the end portion of the eccentric roller, and the other end is tightly pressed in the annular groove, so that the torsional spring is convenient to assemble.

[0023] Furthermore, the controllable overrunning clutch also includes a shift frame, which has a connecting part for fixed connection with the shifting mechanism. The shift frame is annular, and a number of mounting grooves are spaced apart in the circumferential direction. The mounting grooves extend along the axial direction of the shift frame, and the groove openings face one axial end of the shift frame. The shift frame is inserted axially to circumferentially separate all the eccentric rollers, and the eccentric rollers are stopped and engaged with the groove wall of the mounting groove in the circumferential direction.

[0024] Beneficial effects: The rotating frame can be directly inserted between the eccentric rollers along the axial direction to separate them, so that the eccentric rollers are evenly stressed when transmitting torque, and the rotating frame is very easy to assemble.

[0025] Furthermore, one end of the rotating bracket facing away from the mounting groove is provided with two or more protrusions extending axially therefrom, the protrusions extending axially out of the outer ring, and the protrusions constitute the connecting part.

[0026] Beneficial effects: The shifter is fixedly connected to the shifting mechanism through the spaced protrusions, which can further reduce the weight of the cage, thereby reducing the overall weight of the clutch. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an existing controllable overrunning clutch.

[0028] Figure 2 for Figure 1 The diagram shows the controllable overrunning clutch in the engaged state.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 for Figure 1 The diagram shows the controllable overrunning clutch in the disengaged state.

[0031] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0032] Figure 6 This is a schematic diagram of the controllable overrunning clutch of the present invention;

[0033] Figure 7 for Figure 6 The exploded view of the controllable overrunning clutch shown.

[0034] Figure 8 This is a schematic diagram of the eccentric roller.

[0035] Figure 9 This is a schematic diagram showing how annular baffles support eccentric rollers from both ends.

[0036] Figure 10This is a schematic diagram of the annular baffle.

[0037] Figure 11 This is a schematic diagram showing how an annular baffle limits the movement of an eccentric roller.

[0038] Figure 12 This is a schematic diagram of a torsion spring mounted on the end of an eccentric roller.

[0039] Figure 13 This is a schematic diagram showing the fit between the torsion spring and the annular stop plate.

[0040] Figures 1-5 In the middle: 1. Clutch outer ring; 101. Groove; 2. Eccentric roller; 201. Outer arc surface; 202. Inner arc surface; 3. Outer cage; 4. Wave spring; 5. Inner cage; 6. Clutch inner ring;

[0041] Figures 6-13 In the middle: 1. Clutch outer ring; 2. Eccentric roller; 201. Outer arc surface; 202. Inner arc surface; 203. Half shaft; 204. Annular groove; 205. Slotted groove; 3. Shift bracket; 301. Mounting groove; 304. Protrusion; 4. Torsion spring; 5. Annular baffle; 501. Positioning hole; 503. Annular groove. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0044] It is to be understood that the terms "first" and "second" and similar

[0045] The features and advantages of the present application will be further described in the following detailed description of the embodiments.

[0046] Embodiment 1 of the controllable overrunning clutch of the present application

[0047] As shown in Figure 6 , Figure 7 , the controllable overrunning clutch comprises a clutch outer ring 1, a plurality of eccentric rollers 2, a plurality of torsion springs 4 and a shifting frame 3. The clutch outer ring 1 comprises a ring body, and annular retaining pieces 5 are arranged on the axial two sides of the ring body. The annular retaining pieces 5 and the ring body are provided with mounting holes corresponding to each other, and the two annular retaining pieces 5 can be pressed and fixed on the corresponding side end faces of the ring body by fasteners. Each eccentric roller 2 is supported and limited by the annular retaining pieces 5 at both ends.

[0048] As shown in Figures 8 to 11 , the eccentric roller 2 is in a columnar structure, and the axial two ends of the eccentric roller 2 have half shafts 203. The annular retaining pieces 5 are provided with positioning holes 501 for centering the eccentric rollers 2, and the positioning holes 501 are equal in number to the eccentric rollers 2 and correspond in position. The two annular retaining pieces 5 keep the eccentric rollers 2 in the clutch outer ring 1 and make the eccentric rollers 2 contact with the clutch outer ring 1. The eccentric roller 2 has an outer circular arc surface 201 and an inner circular arc surface 202. The outer circular arc surface 201 contacts with the inner circumferential surface of the clutch outer ring 1, and the inner circular arc surface 202 is used to contact with the inner rotating member when the clutch is engaged. The cross section of the eccentric roller 2 is approximately funnel-shaped, and the radial dimension of the middle part is the smallest, and gradually increases from the middle part to the inner and outer sides.

[0049] The outer circumferential surface of the half shaft 203 at the end of the eccentric roller 2 is provided with an annular groove 204, and the end surface of the half shaft 203 is provided with a one-way groove 205. After the half shaft 203 passes through the positioning hole 501 on the annular baffle 5, the annular groove 204 on the half shaft 203 is located on the outer side of the annular baffle 5, the torsional spring 4 is installed in the annular groove 503, and one end of the torsional spring 4 is fixed in the one-way groove 205. The inner circumferential surface of the annular baffle 5 is provided with an annular groove 503, and the other end of the torsional spring 4 is pressed in the annular groove 503. As shown in Figure 12 、 Figure 13 ,

[0050] The dialing frame 3 is annular, as shown in Figure 7 , a plurality of installation grooves 301 are arranged at intervals in the circumferential direction of the dialing frame 3, the installation grooves 301 extend in the axial direction of the dialing frame 3, and the groove openings are directed to one end of the axial direction of the dialing frame 3. The installation grooves 301 are equal in number to the eccentric rollers 2 and correspond in position, the width of the installation grooves 301 is between the minimum radial dimension and the maximum radial dimension of the eccentric rollers 2, the dialing frame 3 is inserted in the axial direction to separate all the eccentric rollers 2 in the circumferential direction, and the eccentric rollers 2 and the groove walls of the installation grooves 301 form a blocking cooperation in the circumferential direction, so that the eccentric rollers 2 are uniformly stressed when transmitting torque.

[0051] The side of the dialing frame 3 away from the installation grooves 301 is provided with a protrusion 304 extending in the axial direction thereof, the protrusion 304 axially extends outward beyond the end surface of the clutch outer ring 1 after the dialing frame 3 is installed, and the protrusion 304 is used for connecting with the dialing mechanism. The protrusion 304 is provided with four, the four protrusions 304 are uniformly distributed at intervals in the circumferential direction, on the basis of ensuring reliable connection of the dialing frame 3 and the dialing mechanism, the weight of the dialing frame 3 is further reduced, and the overall weight of the clutch is further reduced; at the same time, the dialing frame 3 and the dialing mechanism have four connection positions, the connection is more stable, and the torque transmission is more stable and reliable.

[0052] The controllable overrunning clutch of the application centers the eccentric rollers 2 through the two annular baffles 5, the eccentric rollers 2 are kept inside the outer ring and in contact with the inner circumferential surface of the outer ring through the two annular baffles 5 at the ends, the inner diameter of the outer ring is a normal cavity, and thus the machining difficulty of the clutch outer ring 1 is reduced. The annular baffles 5 are detachably connected with the ring body, which can ensure that the two annular baffles 5 on both sides can center the eccentric rollers 2 after assembly is completed. Thus, when the clutch is controlled to change from the engaged state to the disengaged state, the eccentric rollers 2 only swing around the clutch outer ring 1 and will not move, and the eccentric rollers 2 can still normally reset after the control force is removed, so that the clutch can be re-engaged.

[0053] In the embodiment 2, the ring body of the clutch outer ring is detachably connected with the annular baffle on both axial sides to support and center the eccentric rollers, while in the embodiment, the ring body has an annular inward turn on one axial end and is detachably connected with the annular baffle on the other end, the inward turn and the annular baffle are respectively provided with positioning holes matched with the half shafts at the ends of the eccentric rollers to center the eccentric rollers, one end of each eccentric roller is supported on the annular inward turn and the other end is supported on the annular baffle, and the annular baffle and the inward turn cooperate to center the eccentric rollers.

[0054] In the embodiment 3, the annular baffle is provided with a ring groove on the inner circumferential surface, one end of the torsion spring is fixed opposite to the eccentric roller and the other end is pressed in the ring groove on the annular baffle, while in the embodiment, the annular baffle is provided with a plurality of arc grooves on the inner circumferential surface, one end of the torsion spring is fixed opposite to the eccentric roller and the other end is pressed in the arc groove on the annular baffle.

[0055] In the embodiment 4, the shifting frame has four protrusions for connecting the shifting mechanism, while in the embodiment, the protrusions are two. In other embodiments, the number of the protrusions can be changed according to the required size of the torque, when a larger torque is required to shift the eccentric roller, more protrusions can be provided, preferably, the protrusions are evenly distributed in the circumferential direction to make the torque transmission more stable and reliable.

[0056] In the embodiment 5, the eccentric roller has a half shaft on both axial ends, the annular baffle is provided with positioning holes matched with the half shafts, and the half shafts are fitted in the positioning holes to center the eccentric rollers, while in the embodiment, the eccentric roller has positioning holes on both axial ends, and correspondingly, the annular baffle is provided with positioning shafts matched with the positioning holes, the positioning shafts are inserted into the positioning holes to center the eccentric rollers.

[0057] The application also provides embodiments of the clutch outer ring, which have the same structure as the clutch outer ring in the embodiments of the controllable overrunning clutch, and the description is not repeated here.

[0058] The above description is only the preferred embodiments of the application and is not used to limit the application, the patent protection scope of the application is subject to the claims, any equivalent structural changes made according to the content of the description and drawings of the application should also be included in the protection scope of the application.

Claims

1. A controllable overrunning clutch comprising a clutch outer and a plurality of eccentric rollers, the clutch outer comprising an outer body, characterised in that: The inner circumferential surface of the ring body is a cylindrical surface, and the axial two sides of the ring body are respectively provided with axial stop structures. At least one of the axial stop structures is provided with a positioning hole for cooperating with a half shaft of the end portion of the eccentric roller to center the eccentric roller, or at least one of the axial stop structures is provided with a positioning shaft for cooperating with the positioning hole of the end portion of the eccentric roller to center the eccentric roller, and at least one of the axial stop structures is detachably connected with the ring body. The eccentric roller has an outer circular surface for contacting the inner circumferential surface of the ring body, and the half shaft or the positioning hole of the end portion of the eccentric roller is located close to the outer circular surface compared with the center of the outer circular surface. The controllable overrunning clutch further comprises a dialing frame for dialing the inner end of the eccentric roller and rotating the inner end around the half shaft or the positioning hole. The axial two ends of each eccentric roller are provided with a torsion spring for returning the eccentric roller to the engaged position.

2. The controllable overrunning clutch of claim 1, wherein: Both of the axial stop structures are detachably connected with the ring body.

3. The controllable overrunning clutch of claim 2, wherein: The axial stop structure is an annular stop sheet, and the annular stop sheet is fixed and pressed on the end face of the ring body.

4. A controllable overrunning clutch as in claim 3, wherein: The inner circumferential surface of the annular stop sheet is provided with a ring groove, one end of the torsion spring is fixed opposite to the eccentric roller, and the other end is pressed in the ring groove on the annular stop sheet.

5. A controllable overrunning clutch as set forth in any of claims 1-4, characterized in that: The dialing frame has a connecting part for fixedly connecting with the dialing mechanism. The dialing frame is annular, and a plurality of installation grooves are arranged at intervals in the circumferential direction of the dialing frame. The installation grooves extend along the axial direction of the dialing frame, and the groove openings are directed to one end of the axial direction of the dialing frame. The dialing frame is inserted along the axial direction to separate all the eccentric rollers in the circumferential direction, and the eccentric rollers are stop-fitted with the groove walls of the installation grooves in the circumferential direction.

6. A controllable overrunning clutch as in claim 5, wherein: One end of the dialing frame opposite to the installation grooves is provided with two or more protrusions extending along the axial direction thereof. The protrusions axially protrude out of the ring. The protrusions constitute the connecting part.

7. A clutch outer race comprising a race body, characterised in that: The inner circumferential surface of the ring body is a cylindrical surface for contacting the outer circular surface of the eccentric roller. The axial two sides of the ring body are respectively provided with axial stop structures. At least one of the axial stop structures is provided with a positioning hole for cooperating with a half shaft of the end portion of the eccentric roller to center the eccentric roller, or at least one of the axial stop structures is provided with a positioning shaft for cooperating with the positioning hole of the end portion of the eccentric roller to center the eccentric roller. At least one of the axial stop structures is detachably connected with the ring body. The positioning hole or the positioning shaft is arranged at a position close to the outer circular surface compared with the center of the outer circular surface of the eccentric roller after the eccentric roller is installed, so that the eccentric roller is swung around the positioning hole or the positioning shaft when the inner end of the eccentric roller is dialled by the dialing frame, and the eccentric roller is swung to the disengaged position against the elastic force of the torsion spring.

8. The clutch outer of claim 7, wherein: Both of the axial stop structures are detachably connected with the ring body.

9. The clutch outer of claim 8, wherein: The axial stop structure is an annular stop sheet, and the annular stop sheet is fixed and pressed on the end face of the ring body.

10. The clutch outer of claim 9, wherein: The inner circumferential surface of the annular stop sheet is provided with a ring groove for limiting one end of the torsion spring of the end portion of the eccentric roller.

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