WO2022228337A1

WO2022228337A1 - Clutch actuation mechanism and vehicle

Info

Publication number: WO2022228337A1
Application number: PCT/CN2022/088730
Authority: WO
Inventors: 徐占; 杨永刚; 屠有余; 白秀超; 柯志宏
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-04-28
Filing date: 2022-04-24
Publication date: 2022-11-03
Also published as: CN113090682B; CN113090682A

Abstract

A clutch actuation mechanism. The clutch actuation mechanism comprises a housing, a translation transmission component (2), a rotary transmission component (3) and a rotary driving component (1), wherein the translation transmission component (2) comprises a nut (21) and a lead screw shaft (22) screwed into an inner hole of the nut (21), the nut (21) being fixedly arranged on the housing; the rotary transmission component (3) comprises a connection shaft (31), a cam (32) and an adapter (33), the connection shaft (31) being rotatably arranged on the housing, the cam (32) sleeving the connection shaft (31), the adapter (33) being connected to the lead screw shaft (22), and the adapter (33) being capable of abutting against a special-shaped surface (321) of the cam (32); and the rotary driving component (1) is arranged on the housing, the rotary driving component (1) is configured to drive the connection shaft (31) and drive the cam (32) to rotate, and the adapter (33) drives the lead screw shaft (22) to rotate relative to the nut (21) under the driving action of the special-shaped surface (321) of the cam (32), such that the adapter (33) can translate in an axial direction of the lead screw shaft (22) under the driving of the lead screw shaft (22). Further provided is a vehicle.

Description

Clutch Actuator and Vehicle

This application claims the priority of the Chinese patent application with application number 202110468883.9 filed with the China Patent Office on April 28, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of vehicles, for example, to a clutch actuator and a vehicle.

Background technique

As the core assembly to realize the four-wheel drive function of the car, the transfer case is responsible for the distribution and adjustment of torque, and the electronically controlled wet clutch is the mainstream key component used in the transfer case to realize torque distribution and adjustment. The electronically controlled wet clutch is composed of a wet clutch and a clutch actuator. By applying control commands to the clutch actuator, the clutch actuator is controlled to generate a certain axial thrust, which acts on the wet clutch to achieve the transfer case requirements. torque distribution and adjustment functions.

The clutch actuators in the related art mainly include two types: electronically controlled hydraulic type and electronically controlled mechanical type. The electronically controlled hydraulic clutch actuator has good performance, and has the advantages of high control accuracy, fast response and easy safety protection. However, the electronically controlled hydraulic clutch actuator has the disadvantages of being greatly affected by temperature and high cost. The electronically controlled mechanical clutch actuator has the advantages of simple structure, strong adaptability to the environment and low manufacturing cost, and has been widely used in recent years, such as turbine worm clutch actuator, gear pair clutch actuator, etc. The clutch actuator with this structure has the problem of low execution efficiency.

SUMMARY OF THE INVENTION

The present application provides a clutch actuator and a vehicle, which have a simple and compact structure, low manufacturing cost and high execution efficiency.

A clutch actuator, comprising: a housing; a translational transmission component, comprising a nut and a screw shaft screwed into an inner hole of the nut, the nut being fixed on the housing; a rotary transmission The component includes a connecting shaft, a cam and an adapter, the connecting shaft is rotatably arranged on the housing, the cam is sleeved on the connecting shaft, and the adapter is connected with the screw shaft , the adapter can abut on the special-shaped surface of the cam; the rotation driving part is arranged on the casing, and the rotation driving part is configured to drive the connecting shaft and drive the cam to rotate, so The adapter is driven by the special-shaped surface of the cam to drive the screw shaft to rotate relative to the nut, so that the adapter can be driven along the screw shaft by the screw shaft. Axial translation of the screw shaft.

As an optional solution of a clutch actuator, the special-shaped surface of the cam is a helical surface distributed along the axial direction of the connecting shaft.

As an optional solution of a clutch actuator, the cam and the connecting shaft are integral structures.

As an optional solution of the clutch actuator, the inner hole of the nut is provided with an inner helical groove, the outer circumference of the screw shaft is provided with an outer helical groove matching the inner helical groove, and the inner helical groove is provided. A plurality of balls are arranged between the groove and the outer helical groove along the extending direction of the outer helical groove.

As an optional solution for a clutch actuator, the thread lead angle of the inner helical groove

Thread lead angle of the external helical groove

As an optional solution of the clutch actuator, an end of the adapter away from the screw shaft is provided with a mounting pin, and an abutting bearing is sleeved on the mounting pin, and the arc surface of the abutting bearing is can be in contact with the special-shaped surface.

As an optional solution of the clutch actuator, the clutch actuator further includes a thrust bearing, and the thrust bearing is arranged on a side of the adapter that is away from the screw shaft.

As an optional solution of a clutch actuator, the rotary drive component includes an actuator motor, and a rotor shaft of the actuator motor is in driving connection with the connection shaft.

As an optional solution of a clutch actuator, one of the rotor shaft and the connecting shaft is provided with a flat key, the other of the rotor shaft and the connecting shaft is provided with a flat key groove, and the flat key can be inserted into the flat keyway.

The present application also provides a vehicle, comprising the clutch actuator according to any one of the above solutions.

Description of drawings

The accompanying drawings required to be used in the description of the embodiments of the present application will be briefly introduced below.

FIG. 1 is a schematic structural diagram of a clutch actuator provided by an embodiment of the present application from a perspective;

2 is a schematic structural diagram of the clutch actuator provided by the embodiment of the present application from another perspective;

3 is an exploded schematic diagram of a clutch actuator provided by an embodiment of the present application;

Fig. 4 is a partial enlarged view at A of Fig. 3;

5 is a schematic structural diagram of a translational transmission component of a clutch actuator provided in an embodiment of the present application;

6 is a cross-sectional view of a clutch actuator provided by an embodiment of the present application;

7 is a schematic structural diagram of the clutch actuator provided by the embodiment of the present application when the clutch is engaged;

FIG. 8 is a schematic structural diagram of the clutch actuator provided by the embodiment of the present application when the clutch is disconnected.

In the picture:

1-Rotation drive part; 11-Execution motor; 111-Flat key; 112-Rotor shaft; 12-Execution controller;

2-translational transmission part; 21-nut; 211-inner helical groove; 22-screw shaft; 221-thread part; 2211-external helical groove; 222-connecting part; 23-ball;

3-Rotation transmission parts; 31-Connecting shaft; 311-Flat keyway; 32-Cam; 321-Special-shaped surface; 33-Adapter; 331-Installation pin;

4- Thrust bearing.

Detailed ways

The present application will be clarified below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, the drawings only show the structures of the relevant parts of the present application.

In the description of this application, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the meanings of the above terms in the present application can be understood according to the situation.

In this application, unless otherwise expressly specified and defined, a first feature "on" or "under" a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "left", "right" and other azimuth or positional relationships are based on the azimuth or positional relationship shown in the accompanying drawings, which are only for the convenience of description and simplifying operations. Rather than indicating or implying that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, it should not be construed as a limitation on the application. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

As shown in FIGS. 1-3 , the present embodiment provides a clutch actuator, which includes a housing (not shown in the figure), a translation transmission part 2 , a rotation transmission part 3 and a rotation drive part 1 , wherein , the translational transmission component 2 includes a nut 21 and a screw shaft 22 screwed into the inner hole of the nut 21, and the nut 21 is fixed on the housing; the rotational transmission component 3 includes a connecting shaft 31, a cam 32 and an adapter 33, the connecting shaft 31 is rotatably arranged on the housing, the cam 32 is sleeved on the connecting shaft 31, the adapter 33 is connected with the screw shaft 22, and the adapter 33 can abut on the special-shaped surface 321 of the cam 32; The rotary drive member 1 is arranged on the housing, and the rotary drive member 1 is configured to drive the connecting shaft 31 and drive the cam 32 to rotate. The female 21 rotates so that the adapter 33 can translate along the axial direction of the screw shaft 22 under the driving of the screw shaft 22 .

In the clutch actuator provided in this embodiment, by arranging a casing, the casing plays an integral supporting role for the translation transmission part 2, the rotation transmission part 3 and the rotation drive part 1; The cooperation between the driving parts 1, the rotating driving part 1 can drive the screw shaft 22 to rotate relative to the screw nut 21 through the rotating transmission part 3, and at the same time the screw shaft 22 can move linearly along its own axis direction, thereby driving the adapter 33 to translate To generate axial thrust; the translational transmission part 2 is a screw nut pair structure, which has high execution efficiency and good execution reliability; by setting the rotary transmission part 3, the rotary motion of the rotary drive part 1 is transmitted to the translational transmission part 2, Compared with the worm gear type clutch actuator in the prior art, the adapter 33 is driven to rotate by the special-shaped surface 321 of the cam 32, the structure is simple, the design is novel, and the manufacturing cost is low.

In this embodiment, as shown in FIG. 1 , the special-shaped surface 321 of the cam 32 is a helical surface distributed along the axial direction of the connecting shaft 31 , and the centerline of the helical special-shaped surface 321 coincides with the axis of the connecting shaft 31 . Of course, in other embodiments, the structure of the special-shaped surface 321 of the cam 32 can also be set to other shapes, which can be used as long as the adapter 33 can be driven to rotate when the cam 32 rotates.

Optionally, the cam 32 and the connecting shaft 31 are integral structures. With this arrangement, the link of assembling the cam 32 and the connecting shaft 31 can be saved, and the processing efficiency can be improved.

A support bearing 34 is also arranged between the connecting shaft 31 and the housing. As shown in FIG. 1 to FIG. 3 , support bearings 34 are sleeved on both sides of the connecting shaft 31 , and the support bearings 34 are fixed on the housing. , the support bearing 34 can play the role of supporting the connecting shaft 31 , and can reduce the friction when the connecting shaft 31 rotates relative to the housing, and ensure the smoothness of the rotating process of the connecting shaft 31 .

As shown in FIG. 4 , an end of the adapter 33 away from the screw shaft 22 is provided with a mounting pin 331 , an abutting bearing 332 is sleeved on the mounting pin 331 , and the arc surface of the abutting bearing 332 can abut against the special-shaped surface 321 . This arrangement can reduce the friction generated when the adapter 33 and the cam 32 move relative to each other, reduce wear and tear, and also reduce the heat generated during the relative movement between the two, prolonging the distance between the cam 32 and the adapter 33. service life.

As shown in FIG. 3 , the clutch actuator further includes a thrust bearing 4 , and the thrust bearing 4 is disposed on the side of the adapter 33 away from the screw shaft 22 . By providing the thrust bearing 4, the axial displacement of the adapter 33 can be transmitted to the clutch, so as to realize the engagement state of the clutch. Illustratively, the thrust bearing 4 is limited by an annular step and an end plane on the adapter 33 .

As shown in FIG. 5 , the inner hole of the nut 21 is provided with an inner helical groove 211 , the outer periphery of the screw shaft 22 is provided with an outer helical groove 2211 matching the inner helical groove 211 , and the inner helical groove 211 and the outer helical groove 2211 are provided with an outer helical groove 2211 . A plurality of balls 23 are arranged along the extending direction of the outer helical groove 2211 . By arranging the balls 23 , the rotational resistance between the nut 21 and the screw shaft 22 can be reduced, the wear during relative movement between the two can be reduced, and the service life of the nut 21 and the screw shaft 22 can be prolonged.

Optionally, the thread lead angle of the inner helical groove 211

Thread lead angle of external helical groove 2211

When the clutch is transformed from the engaged state to the disengaged state, the return spring of the clutch will drive the thrust bearing 4 to move towards the direction close to the adapter 33, and the inner helical groove 211 is set to its thread lift angle

Under the pushing action of the thrust bearing 4, the adapter 33 can drive the screw shaft 22 to move along its axis direction, so that the screw shaft 22 can rotate relative to the screw nut 21, so that the screw shaft 22 and the adapter 33 can be reset , the setting of the reset structure can be omitted, the overall structure of the clutch actuator can be simplified, the overall volume thereof can be reduced, and the manufacturing cost can be saved.

As shown in FIG. 5 , the screw shaft 22 includes a threaded portion 221 and a connecting portion 222 that are connected to each other. The outer diameter of the connecting portion 222 is larger than the outer diameter of the threaded portion 221, and the two are connected to form a stepped shaft structure. The connecting portion 222 is configured to connect In the adapter 33 , the outer helical groove 2211 is disposed on the outer circumference of the threaded portion 221 . In this embodiment, the connecting portion 222 is provided with a plurality of first connecting holes at intervals along the circumferential direction thereof, and the adapter 33 is provided with a plurality of second connecting holes corresponding to the first connecting holes, and the connecting pieces are pierced in sequence. in the first connection hole and the second connection hole, so as to realize the connection between the connection part 222 and the adapter 33 . Optionally, in this embodiment, the connection portion 222 is a connection flange, and the connection is more stable.

Optionally, one of the first connection hole and the second connection hole is a through hole, the other of the first connection hole and the second connection hole is a threaded hole, the connecting piece is a connecting bolt, and the bolt connection has the advantages of simple processing and easy disassembly. The advantage of convenient installation. Of course, the screw shaft 22 and the adapter 33 may also be connected in other ways, such as welding or clamping, which is not limited in this embodiment.

The center of the screw shaft 22 is provided with a central hole, which can be set to avoid the input shaft, and can reduce the weight of the clutch actuator.

As shown in FIG. 1 , FIG. 2 and FIG. 6 , the rotary driving component 1 includes an actuator motor 11 , and the rotor shaft 112 of the actuator motor 11 is in driving connection with the connecting shaft 31 . One of the rotor shaft 112 and the connecting shaft 31 is provided with a flat key 111 , and the other of the rotor shaft 112 and the connecting shaft 31 is provided with a flat key groove 311 , and the flat key 111 can be inserted into the flat key groove 311 to ensure that the connecting shaft 31 is connected to the flat key groove 311 . Stable connection between the rotor shafts 112 so that the connection shaft 31 rotates with the rotation of the rotor shaft 112 . In this embodiment, the rotor shaft 112 is provided with a flat key 111 , and the connecting shaft 31 is provided with a flat key groove 311 .

The rotary drive component 1 further includes an execution controller 12 , and the execution controller 12 is configured to receive and process the control signal sent by the transfer case, and then output it to the execution motor 11 . Exemplarily, the execution controller 12 is fixed on the execution motor 11 through a connector. The execution motor 11 is responsible for rotating the rotor shaft 112 by a preset angle according to the command of the execution controller 12. The rotor shaft 112 drives the connecting shaft 31 and the cam 32 to rotate by the preset angle, and at the same time, the special-shaped surface 321 of the cam 32 pushes the adapter 33 to drive the wire. The screw shaft 22 rotates relative to the screw nut 21; through the cooperation between the screw shaft 22 and the screw nut 21, the rotation of the screw shaft 22 can be converted into the translation of the screw shaft 22 along its axis direction, and the drive adapter 33 is driven along the The axial direction of the screw shaft 22 translates to push the thrust bearing 4 to move in a direction close to the clutch, so as to implement the pressing operation of the clutch.

The working principle of clutch coupling or separation is briefly described below with reference to Figures 1 to 8:

(1) The clutch is converted from a disengaged state to a combined state:

The execution controller 12 is configured to receive the transfer case engaging clutch control signal, control the rotor shaft 112 of the execution motor 11 to rotate forward (in the direction shown in FIG. 1 ), and drive the connection shaft 31 and the cam 32 to rotate forward through the execution motor 11 , and the cam The special-shaped surface 321 of 32 can push the upper end of the adapter 33 to move to the left, thereby driving the screw shaft 22 to rotate relative to the screw nut 21. At the same time, the screw shaft 22 will translate along its axis direction to drive the adapter 33 to approach. The direction of the thrust bearing 4 moves, thereby pushing the thrust bearing 4 to move in the direction close to the clutch, until the thrust bearing 4 is in contact with the clutch, and pushes the clutch to become engaged. By adjusting the output torque of the actuator motor 11, the transmission torque of the clutch can be adjusted. size.

(2) The clutch is converted from a combined state to a disengaged state:

The execution controller 12 is configured to receive the transfer case engaging clutch control signal, control the rotor shaft 112 of the execution motor 11 to reverse (the opposite direction as shown in FIG. 1 ), and drive the connecting shaft 31 and the cam 32 to reverse the rotation through the execution motor 11 , there will be a gap between the cam 32 and the upper end of the adapter 33; at this time, the return spring of the clutch will push the thrust bearing 4 to move in the direction close to the screw nut 21, thereby driving the adapter 33 and the screw shaft 22 to produce axial Translational movement due to the lead angle of the thread of the internal helical groove 211

Under the pushing action of the thrust bearing 4, the adapter 33 can drive the screw shaft 22 to move along its axis direction, so that the screw shaft 22 can rotate relative to the screw nut 21, so that the screw shaft 22 and the adapter 33 can be reset , the clutch is transformed into the disengaged state.

This embodiment also provides a vehicle, by applying the above-mentioned clutch actuator, the structure is compact, the execution efficiency is high, and the user experience can be improved.

Claims

A clutch actuator comprising:

case;

A translational transmission component (2) includes a screw nut (21) and a screw shaft (22) screwed into the inner hole of the screw nut (21), the screw nut (21) being fixed on the housing superior;

A rotary transmission component (3) includes a connecting shaft (31), a cam (32) and an adapter (33), the connecting shaft (31) is rotatably arranged on the casing, and the cam (32) is sleeved On the connecting shaft (31), the adapter (33) is connected with the screw shaft (22), and the adapter (33) can abut against the special shape of the cam (32). face(321);

A rotary driving component (1) is provided on the housing, the rotary driving component (1) is configured to drive the connecting shaft (31) and drive the cam (32) to rotate, and the adapter ( 33) Under the driving action of the special-shaped surface (321) of the cam (32), the screw shaft (22) is driven to rotate relative to the nut (21), so that the adapter (33) It can translate along the axial direction of the screw shaft (22) under the driving of the screw shaft (22).
The clutch actuator according to claim 2, wherein the special-shaped surface (321) of the cam (32) is a helical surface distributed along the axial direction of the connecting shaft (31).
The clutch actuator according to claim 1, wherein the cam (32) and the connecting shaft (31) are integral structures.
The clutch actuator according to claim 1, wherein an inner helical groove (211) is provided in the inner hole of the screw nut (21), and an outer periphery of the screw shaft (22) is provided with the inner helical groove (211) a matching outer helical groove (2211), and between the inner helical groove (211) and the outer helical groove (2211), a plurality of balls ( twenty three).
The clutch actuator according to claim 4, wherein the thread lead angle of the inner helical groove (211) is
Thread lead angle of the outer helical groove (2211)
The clutch actuator according to claim 1, wherein a mounting pin (331) is provided at one end of the adapter (33) away from the screw shaft (22), and a mounting pin (331) is sleeved on the mounting pin (331). There is an abutment bearing (332), and the circular arc surface of the abutment bearing (332) can abut against the special-shaped surface (321).
The clutch actuator according to claim 1, further comprising a thrust bearing (4), the thrust bearing (4) being arranged on a side of the adapter (33) away from the screw shaft (22).
The clutch actuator according to any one of claims 1-7, wherein the rotary drive member (1) comprises an actuator motor (11), the rotor shaft (112) of the actuator motor (11) being connected to the The connecting shaft (31) is connected by transmission.
The clutch actuator according to claim 8, wherein one of the rotor shaft (112) and the connection shaft (31) is provided with a flat key (111), the rotor shaft (112) and the connection The other of the shafts (31) is provided with a flat key groove (311), and the flat key (111) can be inserted into the flat key groove (311).
A vehicle comprising the clutch actuator of any one of claims 1-9.