CN112283264B

CN112283264B - Bidirectional overrunning clutch

Info

Publication number: CN112283264B
Application number: CN202011128316.0A
Authority: CN
Inventors: 邓志君; 董铸荣; 韩承伟; 朱小春
Original assignee: Shenzhen Polytechnic
Current assignee: Shenzhen Polytechnic
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2023-08-25
Anticipated expiration: 2040-10-20
Also published as: CN112283264A

Abstract

The application provides a bidirectional overrunning clutch which comprises a driving device, a main transmission gear, a sleeve gear, rollers and a transmission shaft, wherein the output end of the driving device is connected with and drives the main transmission gear to rotate, the main transmission gear is meshed with the sleeve gear, the transmission shaft is arranged at a hollow part of an inner ring part of the sleeve gear, the rollers are arranged between the inner side wall of the inner ring part of the sleeve gear and the transmission shaft, nested concave parts sleeved on the outer sides of the rollers are arranged at positions, corresponding to the rollers, of the inner side wall of the inner ring part of the sleeve gear, and gaps are reserved between the nested concave parts and the rollers. The application realizes bidirectional transmission, has simple structure, good transmission effect, convenient maintenance and wider application range.

Description

Bidirectional overrunning clutch

[ field of technology ]

The application relates to a transmission device, in particular to a bidirectional overrunning clutch which is used for a transmission component of a power device such as an automatic steering mechanism of a vehicle.

[ background Art ]

The bidirectional overrunning clutch is used as a transmission component, is connected with the prime motor and the working machine through two ends and is used for transmitting or separating power between the prime motor and the working machine. The traditional overrunning clutch can only rotate in one direction, the energy consumption is high, the clutch function cannot be fully exerted, and the bidirectional overrunning clutch can automatically separate or combine the moving assembly according to the change of the rotating direction, so that the driving component can bidirectionally drive the driven component to rotate, and the driving component does not rotate along with the driven component when the driven component rotates. The existing bidirectional overrunning clutch is complex in structure, more in related parts, inconvenient to maintain and high in processing cost, and is difficult to meet the requirements of steering transmission of an automatic driving vehicle, for example, and has certain limitations.

Therefore, the bidirectional overrunning clutch has the advantages of simple structure, low processing cost, convenient maintenance and good transmission effect.

[ application ]

The application aims to provide a bidirectional overrunning clutch with simple structure and good transmission effect.

In order to achieve the purpose of the application, the following technical scheme is provided:

the application provides a bidirectional overrunning clutch which comprises a driving device, a main transmission gear, a sleeve gear, rollers and a transmission shaft, wherein the output end of the driving device is connected with and drives the main transmission gear to rotate, the main transmission gear is meshed with the sleeve gear, the transmission shaft is arranged at a hollow part of an inner ring part of the sleeve gear, the rollers are arranged between the inner side wall of the inner ring part of the sleeve gear and the transmission shaft, nested concave parts sleeved on the outer sides of the rollers are arranged at positions, corresponding to the rollers, of the inner side wall of the inner ring part of the sleeve gear, and gaps are reserved between the nested concave parts and the rollers.

In some embodiments, the shape of the nesting recess is adapted to fit over the outside of the roller; the nesting recess is a semi-cylindrical shaped groove, or the nesting recess includes inclined surfaces that are connected to form a groove.

In some embodiments, the bidirectional overrunning clutch further comprises a frame, the frame is installed below the outer sleeve gear, the transmission shaft penetrates through the middle of the frame, and the outer sleeve gear is installed in a matched mode with the frame.

In some embodiments, the rack is provided with a first installation cavity, the outer gear comprises an upper gear part and a lower connecting part, and the lower connecting part is installed in the first installation cavity of the rack.

In some embodiments, a first needle bearing is arranged between the side wall of the first installation cavity of the rack and the lower layer connecting part of the outer sleeve gear.

In some embodiments, the bi-directional overrunning clutch further includes a roller bracket mounted in the housing between the lower connection of the sleeve gear and the drive shaft, the rollers being mounted on the roller bracket.

In some embodiments, a second needle bearing is arranged between the roller bracket and the lower layer connecting part of the outer sleeve gear.

In some embodiments, a third needle bearing is disposed between the drive shaft and the frame.

In some embodiments, the frame is provided with a second installation cavity which is positioned below the first installation cavity and communicated with the first installation cavity, and the third needle bearing is arranged between the transmission shaft and the side wall of the second installation cavity.

In some further embodiments, a speed reducer is disposed between the driving device and the main transmission gear.

Compared with the prior art, the application has the following advantages:

according to the application, when the clutch rotates bidirectionally, the bidirectional movement of the rotating shaft does not influence the movement state of the driving part, namely the outer sleeve gear does not rotate along with the transmission shaft; when the driving part moves, the driven part can be driven to rotate in the same direction, the transmission shaft is controlled to rotate, and the purpose of clutch combination or separation power transmission is achieved.

The bidirectional overrunning clutch can basically overcome the defects of other overrunning clutches, meets the requirement of bidirectional transmission, is suitable for power and torque transmission between various working conditions between a main motor and a transmission shaft, and has the advantages of simple structure, convenient maintenance and wide application range.

[ description of the drawings ]

FIG. 1 is a cross-sectional view of a two-way overrunning clutch according to the present application;

FIG. 2 is a perspective view of a two-way overrunning clutch according to the present application;

FIG. 3 is a top view of the drive shaft mated with the outer sleeve gear of the present application;

FIG. 4 is an enlarged view of portion a of FIG. 3;

fig. 5 is a block diagram of a roller bracket according to the present application.

[ detailed description ] of the application

Referring to fig. 1 to 3, the bidirectional overrunning clutch of the present application includes a driving device 10, a main transmission gear 8, a housing gear 3, rollers 11, a transmission shaft 7, and a frame 1, where the driving device adopts a driving motor, and an output end of the driving motor is connected to and drives the main transmission gear 8 to rotate, and in a specific embodiment, an output end of the driving motor is connected to the main transmission gear 8 again via a speed reducer 9. The main transmission gear 8 is meshed with the outer sleeve gear 3, and the gear ratio i=4.

Specifically, as shown in the figure, the outer sleeve gear 3 has a structure with meshing teeth on the outer part and a hollow perforation in the middle part, and the perforation in the middle part is an inner ring part of the outer sleeve gear.

The transmission shaft 7 is arranged in the hollow part of the inner ring part of the outer sleeve gear 3 and is positioned on the central axis of the outer sleeve gear 3. The roller 11 is disposed between the inner side wall of the inner ring portion of the sleeve gear 3 and the transmission shaft 7, a nesting recess 12 sleeved on the outer side of the roller is disposed at a position corresponding to the roller 11 on the inner side wall of the inner ring portion of the sleeve gear 3, and a gap is reserved between the nesting recess and the roller, and in a specific embodiment, the gap can be set to about 0.5 mm.

In some embodiments, the shape of the nesting recess is adapted to fit over the outside of the roller; the nesting recess is a semi-cylindrical shaped groove, or the nesting recess includes inclined surfaces that are connected to form a groove. In the embodiment shown in the figure, the nesting concave comprises inclined planes which are connected to form a groove, inner chamfers are formed between the inclined planes in a connecting mode, and the inclined planes are arranged symmetrically on two sides, namely, the inclined planes are arranged on two sides corresponding to the rollers.

As seen from fig. 3 and 4, the distance between the inner side wall of the inner ring portion and the axis of the drive shaft 7 is smaller than the sum of the radius of the drive shaft 7 and the diameter of the roller 11, the distance between any point of the nesting recess 12 and the axis of the drive shaft 7 is larger than the distance between the inner side wall of the inner ring portion and the axis of the drive shaft 7, and the distance between the farthest point of the nesting recess and the axis of the drive shaft 7 is larger than the sum of the radius of the drive shaft and the diameter of the roller, that is, the gap exists between the nesting recess and the roller.

The bi-directional overrunning clutch further comprises a roller bracket 6, which is mounted on the frame. Referring to fig. 5, specifically, the roller bracket 6 includes a fixing portion 61 and a plurality of clamping portions 62 spaced apart from each other, the fixing portion 61 is mounted in the frame 1, and the rollers 11 are mounted between the clamping portions 62.

As shown in fig. 1 and 2, the rack 1 is mounted below the outer gear 3, and the transmission shaft 7 passes through the middle of the rack 1, the rack 1 is provided with a first mounting cavity, a second mounting cavity which is located below the first mounting cavity and is communicated with the first mounting cavity, the outer gear 3 is mounted in cooperation with the rack 1, specifically, the outer gear 3 includes an upper gear portion and a lower connecting portion, the upper gear portion is meshed with the main transmission gear, the lower connecting portion is mounted in the first mounting cavity of the rack 1, and the distance from the lower connecting portion of the outer gear to the central shaft is greater than the distance from the inner side wall of the inner ring portion of the outer gear to the central shaft. The roller bracket 6 is arranged between the lower connecting part and the transmission shaft 7.

A first needle bearing 2 is arranged between the side wall of the first installation cavity of the frame 1 and the lower layer connecting part of the outer sleeve gear 3. A second needle bearing 4 is arranged between the roller bracket 6 and the lower layer connecting part of the outer sleeve gear 3. A third needle bearing 5 is arranged between the transmission shaft 7 and the side wall of the second installation cavity of the frame 1.

When the outer sleeve gear 3 rotates until the inner wall of the nesting concave 12 contacts with the roller 11, the roller 11 can be driven to move in the same direction, and the transmission shaft 7 is driven to rotate by the movement of the roller 11 due to the action of friction force, so that the clutch transmits torque, and the purpose that the outer sleeve gear 3 drives the transmission shaft 7 is realized; when the external gear 3 is not moved in turn and the drive shaft 7 is rotated, the clutch is in a disengaged state and no torque is transmitted, because of the clearance between the nesting recess and the rollers 11, and not to the external gear 3.

When the driving motor output power at the driving end is transmitted to the main transmission gear after the speed reduction and torque increase effects of the speed reducer 9, the main transmission gear 8 meshed with the outer sleeve gear 3 rotates, and the structures of the first needle bearing 2 and the second needle bearing 4 are respectively arranged between the outer sleeve gear 3 and the frame 1 and between the outer sleeve gear 3 and the roller support 6, so that the outer sleeve gear 3 can rotate along with the main transmission gear 8 when rotating.

Because the inner ring part of the outer sleeve gear 3 is provided with the nested concave part, the inner ring part is contacted with the roller 11 on the roller bracket 6 in the rotating process, the transmission shaft 7 contacted with the roller 11 rotates in the same direction under the action of friction force, and the bidirectional overrunning clutch is in a combined state, thereby realizing the purpose of bidirectional torque transmission. A third needle bearing 5 structure is arranged between the transmission shaft 7 and the frame 1, so that the transmission shaft 7 is not contacted with the roller bracket 6; meanwhile, a roller 11 structure is arranged between the transmission shaft and the roller support 6, so that the transmission shaft can rotate bidirectionally.

When the motor does not work and the driving end loses power, the outer sleeve gear 3 does not rotate, and at the moment, when the transmission shaft 7 rotates bidirectionally, the action of the third needle bearing 5 and the roller 11 does not affect the motion state of the outer sleeve gear 3, the outer sleeve gear cannot be driven to move, and at the moment, the bidirectional overrunning clutch is in a separated state and does not transmit torque.

The device can overcome the problems that the traditional overrunning clutch cannot rotate bidirectionally, has a complex structure, is inconvenient to maintain and the like, has a wider application range, and has important significance for improving the requirements of steering transmission and the like of an automatic driving vehicle.

The above-mentioned embodiments are only preferred embodiments of the present application, and the scope of the present application is not limited thereto, and any equivalent transformation based on the technical solution of the present application falls within the scope of the present application.

Claims

1. The bidirectional overrunning clutch is characterized by comprising a driving device, a main transmission gear, a sleeve gear, rollers, a transmission shaft and a roller support, wherein the output end of the driving device is connected with and drives the main transmission gear to rotate, the main transmission gear is meshed with the sleeve gear, the transmission shaft is arranged at a hollow part of an inner ring part of the sleeve gear, the rollers are arranged between the inner side wall of the inner ring part of the sleeve gear and the transmission shaft, a nested concave part sleeved on the outer side of the rollers is arranged at the position, corresponding to the rollers, of the inner side wall of the inner ring part of the sleeve gear, and a gap is reserved between the nested concave part and the rollers;

the roller support is arranged in the frame and is positioned between the lower connecting part of the outer sleeve gear and the transmission shaft, and comprises a fixing part and a plurality of clamping parts which are distributed at intervals, wherein the fixing part is arranged in the frame, and the roller is arranged between the clamping parts;

the rack is provided with a first installation cavity, the outer sleeve gear comprises an upper layer gear part and a lower layer connecting part, the lower layer connecting part is installed in the first installation cavity of the rack, the lower layer connecting part is in a boss shape, a first needle bearing is arranged between the side wall of the first installation cavity of the rack and the lower layer connecting part of the outer sleeve gear, and a second needle bearing is arranged between the roller support and the lower layer connecting part of the outer sleeve gear.

2. The bi-directional overrunning clutch of claim 1, wherein said nesting recess is shaped to fit over the outside of said roller; the nesting recess is a semi-cylindrical shaped groove, or the nesting recess includes inclined surfaces that are connected to form a groove.

3. The bi-directional overrunning clutch of claim 2, wherein said drive shaft extends through a central portion of said housing, said outer gear being mounted in cooperation with said housing.

4. The bi-directional overrunning clutch of claim 1, wherein a third needle bearing is disposed between the drive shaft and the housing.

5. The bi-directional overrunning clutch of claim 4, wherein said housing defines a second mounting cavity positioned below and in communication with said first mounting cavity, said third needle bearing being disposed between said drive shaft and a sidewall of said second mounting cavity.

6. A bi-directional overrunning clutch as defined in any one of claims 1-5, wherein a speed reducer is provided between said drive means and said main drive gear.