CN111998013A

CN111998013A - Clutch actuator

Info

Publication number: CN111998013A
Application number: CN202010867898.8A
Authority: CN
Inventors: 柯建豪; 李战训; 刘钊; 谢阳
Original assignee: Zhejiang Keboda Industrial Co ltd
Current assignee: Zhejiang Keboda Industrial Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2020-11-27

Abstract

A clutch actuator includes a housing, a piston, a drive mechanism and a transmission mechanism. The housing is provided with a pressure chamber. The driving mechanism is connected with the piston through a transmission mechanism, and the transmission mechanism is used for converting the rotary motion of the driving mechanism into linear motion so as to drive the piston to axially move in the shell and apply pressure to the pressure medium filled in the pressure cavity; the drive mechanism includes a stator and a rotor. The transmission mechanism comprises a planetary roller screw, a bearing and a limiting block, and the planetary roller screw comprises a screw and a nut; one end of the screw rod is connected with the piston, and the other end of the screw rod is connected with the limiting block; the shell or the stator is provided with a guide hole, and the limiting block can be axially moved but can not be rotationally arranged in the guide hole; the nut is positioned between the piston and the limiting block, is connected with the rotor and can rotate along with the rotor; the bearing is fixedly arranged on the shell and sleeved outside the nut. The clutch actuator has the advantages of compact structure, light weight and easy assembly.

Description

Clutch actuator

Technical Field

The present invention relates to a clutch for a vehicle.

Background

A clutch actuator for a motor vehicle transmission comprises a master cylinder which comprises a housing and a piston which is axially displaceable in the housing and acts on a pressure chamber filled with a pressure medium, wherein the piston is driven by an electric motor which has a stator and a rotor and which is driven in rotation by means of a planetary roller gear which converts the rotational drive into an axial movement. Wherein the pressure chamber is arranged in a ring shape and the piston is arranged in a "cup shape" so as to be movable in the ring-shaped pressure chamber for generating hydraulic pressure. The planetary roller gear is received centrally in the radial interior of the pressure chamber, while the main shaft driven by the electric motor is supported at its end by means of a single radial bearing relative to the housing, said main shaft being directly mounted in a rotationally fixed manner in the radial interior of the rotor, and the pressure compensation of the pressure chamber is arranged in a complementary chamber of the housing and in a storage container connected to the housing and arranged outside the housing.

The technical scheme mainly has the following defects:

1. in the technical scheme, the piston is arranged on the nut of the roller screw rod and is arranged into a cup-shaped structure, so that the volume of the pressurizing cylinder body is increased, and the volume and the weight of the actuating mechanism system are increased;

2. in the technical scheme, the supplement cavity and the oil storage cavity are arranged on the shell in a two-body mode, so that the structure of a product is complex, an assembly process is added, and the production time and the manufacturing cost are increased;

3. in the technical scheme, the radial bearing is arranged on a driving shaft and a bearing cover of the motor and is finally fixed on the shell; thus, the radial bearing is slightly small in model selection and insufficient in axial bearing capacity, and finally the product fails.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a clutch actuator which has compact structure, light weight and easy assembly.

The embodiment of the invention provides a clutch actuator, which comprises a shell, a piston, a driving mechanism and a transmission mechanism, wherein the piston is arranged on the shell; the shell is provided with a pressure cavity; the driving mechanism is connected with the piston through a transmission mechanism, and the transmission mechanism is used for converting the rotary motion of the driving mechanism into linear motion so as to drive the piston to axially move in the shell and apply pressure to the pressure medium filled in the pressure cavity; the driving mechanism comprises a stator and a rotor; the planetary roller screw is characterized by comprising a screw rod and a nut; one end of the screw rod is connected with the piston, and the other end of the screw rod is connected with the limiting block; the shell or the stator is provided with a guide hole, and the limiting block can be axially moved but can not be rotationally arranged in the guide hole; the nut is positioned between the piston and the limiting block, is connected with the rotor and can rotate along with the rotor; the bearing is fixedly arranged on the shell and sleeved outside the nut.

The invention has at least the following advantages:

1. the driving mechanism of the embodiment of the invention is composed of a stator and a rotor, the transmission mechanism is composed of a planetary roller screw, two ends of a screw rod of the planetary roller screw are respectively connected with a piston and a limiting block, a nut of the planetary roller screw is connected with the rotor, and the rotor, the screw rod and the nut are radially supported in a shell by a bearing;

2. the bearing is fixedly arranged in the shell, so that the radial size of the bearing is increased, and the axial bearing capacity of the bearing and the whole clutch actuator is improved;

3. the oil storage cavity and the pressure cavity are designed integrally, so that the structure is compact, and the volume and the weight of a product are reduced;

4. the electronic control module is provided with an opening for the screw to pass through, and the screw passes through the opening and moves axially in the guide hole, so that the size of the actuator in the axial direction can be reduced.

Drawings

FIG. 1 shows a schematic top view of a clutch actuator according to an embodiment of the invention.

Fig. 2 shows a schematic K-K cross-section of fig. 1.

Fig. 3 shows a partially enlarged schematic view of fig. 2.

Fig. 4 shows a schematic structural view of a piston according to an embodiment of the present invention.

Fig. 5 shows a schematic structural view of a metal piece of a piston according to an embodiment of the invention.

Fig. 6 to 8 are schematic structural views of a seal ring holder according to an embodiment of the present invention, respectively, from different angles.

FIG. 9 illustrates a cross-sectional schematic view of a clutch actuator according to an embodiment of the present invention from another angle.

FIG. 10 illustrates a cross-sectional schematic view of a clutch actuator according to an embodiment of the present invention from yet another angle.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Referring to fig. 1 to 3, a clutch actuator according to an embodiment of the present invention includes a housing 1, a piston 2, a driving mechanism, a transmission mechanism, and an electronic control module. A pressure chamber 11 is provided in the housing 1.

The drive mechanism is connected to the piston 2 via a transmission mechanism for converting a rotational movement of the drive mechanism into a linear movement to drive the piston 2 to move axially in the housing 1 to apply a pressure to the pressure medium filled in the pressure chamber 11. In the present embodiment, the pressure medium is transmission oil.

The drive mechanism includes a stator 71 and a rotor 72. The transmission mechanism comprises a planetary roller screw comprising a screw 81, a nut 82 and planetary rollers (not shown in the figure) arranged between the screw 81 and the nut 82, a bearing 83 and a limit block 84. One end of the screw 81 is connected to the piston 2, and the other end of the screw 81 is connected to the restricting block 84. The stator 71 is provided with a guide hole 18, and the restricting piece 84 is axially movably but non-rotatably provided in the guide hole 18. A nut 82 is rotatably connected to the screw 81 via planetary rollers and is located between the piston 2 and a restricting block 84, the nut 82 being connected to the rotor 72 so as to be rotatable with the rotor 72. The bearing 83 is fixedly mounted to the housing and is sleeved outside the nut 82.

In the present embodiment, the stator 71 is fixed inside the housing 1. The stator 71 includes a stator body 71a and a guide sleeve 71 b; one end of the stator body 71a is provided with a convex pillar portion 71c, the convex pillar portion 71c and the guide sleeve 71b are both provided with a central hole, the guide sleeve 71b is inserted into the central hole of the convex pillar portion 71c and connected with the hole wall of the central hole of the convex pillar portion 71c, and the connection mode can be fixed connection or integrated with the stator body 71 a. The center hole of the guide sleeve 71b constitutes the guide hole 18 described above. In other embodiments, the guide hole 18 may also be provided in the housing 1. The rotor 72 is ring-shaped and a portion of the outer peripheral surface of the nut 82 is coupled to the inner peripheral surface of the rotor 72 by means including, but not limited to, interference fit, bonding, etc. The limiting block 84 is a sleeve, which is sleeved outside the screw 81 (can be fixedly connected with the screw 81 or integrally formed), three circular arc protrusions are uniformly arranged on the outer circumferential surface of the limiting block 84 along the circumferential direction, and circular arc grooves matched with the three circular arc protrusions are arranged on the inner circumferential surface of the guide hole 18.

Alternatively, the bearing 83 is a ball bearing, an outer ring of the ball bearing is directly and fixedly installed on the housing 1, and an inner ring of the ball bearing is sleeved outside the nut 82 (for example, the two are in interference fit), and can rotate along with the nut 82. In the example shown in the figure, one end of the roller bearing 83 is attached to the bearing limit step 17 of the housing 1, and the other end is attached to the snap spring 85 fixed to the housing 1. The screw 81 and the nut 82 are radially supported in the shell 1 by the ball bearing 83, the inner ring of the ball bearing 83 is arranged outside the nut 82 in a rotation-resisting manner, and the structure has the advantages that the radial size of the ball bearing can be increased on the premise that the size of the actuating mechanism is not increased, so that the axial bearing capacity of the ball bearing is improved, the axial bearing capacity of the whole actuator can be improved, the hydraulic pressure of a system can be increased finally, and the requirement of a clutch for larger load is met.

Please refer to fig. 4 and 5. In the present embodiment, the piston 2 includes a plastic-coated member 2a (plastic member) and a plastic-coated member 2b (metal member), and the plastic-coated member 2a coats an end surface and a side surface of the plastic-coated member 2b near one end of the pressure chamber 11. The outer side surface area of the plastic-coated piece 2b is provided with a plane part 23, and the distance between the plane part 23 and the central axis of the plastic-coated piece 2b can be smaller than the diameter of the plastic-coated piece 2b (i.e. the mode shown in fig. 5) or larger than the diameter of the plastic-coated piece 2b (i.e. a plane part is formed by a region protruding from the outer side surface of the cylindrical plastic-coated piece 2b along the radial direction) for preventing the relative rotation of the plastic-coated piece 2a relative to the plastic-coated piece 2 b. The outer side surface area that is moulded by the package by 2b is moulded still is provided with annular groove 24, and the inner side surface of the piece 2a is moulded by the package is equipped with the annular bulge 25 with annular groove matched with, and annular bulge 25 and annular groove 24 unsmooth cooperation for prevent that the package from moulding 2a relatively by the package and moulding 2b and appear the axial and drop, avoid taking place to lose efficacy in subsequent use piston structure. In another embodiment, an annular protrusion may be disposed on the plastic-coated outer side surface region of the plastic-coated member 2b, and an annular groove matching with the annular protrusion may be disposed on the inner side surface of the plastic-coated member 2a, or another type of groove or protrusion may be employed, which may also play a role in preventing the plastic-coated member 2a from axially falling off relative to the plastic-coated member 2 b. The piston of the embodiment is manufactured in a mode that the metal piece is coated with the plastic piece, compared with the piston manufactured by all metal pieces, the piston is light in weight, reduces bending moment applied to a bearing (the sealing is adversely affected due to overlarge bending moment), and accords with the design principle of light weight; compared with an all-plastic part, the screw rod can be directly and reliably connected with the screw rod in a simple mode (such as riveting, universal joint, bolt connection and the like), the strength of a stressed part can be increased, and the processing cost is lower. The piston 2 is cylindrical, and the volume of the piston can be reduced on the premise that the sectional area is not changed.

And a sealing structure is arranged between the shell 1 and the piston 2. The aforementioned pressure chamber 11 is defined by the housing 1, the piston 2 and the sealing structure together. The clutch actuator has a locking ring 6 and a reservoir chamber 12. The locking ring 6 is fixedly connected with the housing 1 and is used for locking and fixing the sealing structure on the housing 1. The side of the piston 2 is provided with an oil passing groove 21. The oil sumps 21 extend in the axial direction of the piston 2. Preferably, the oil passing grooves 21 are plural in number, and the plural oil passing grooves 21 are distributed at intervals in the circumferential direction of the piston 2. The seal structure is provided with an oil feed passage 57 so that the oil in the cavity of the oil reservoir 12 can flow into the oil sumps 21 through the oil feed passage 57.

The sealing structure comprises a first sealing ring 31, a second sealing ring 32 and a sealing ring support 5. The second seal ring 32, the seal ring holder 5 and the first seal ring 31 are arranged in sequence in a direction away from the pressure chamber 11. The sealing ring support 5 is provided with a support through hole 50, the piston sequentially passes through the locking ring 6, the first sealing ring 31, the support through hole 50 and the second sealing ring 32, and the side surface of the piston 2 is in sliding sealing contact with the first sealing ring 31 and the second sealing ring 32. The oil feed passage 57 is provided in the seal ring holder 5. Optionally, the first sealing ring 31 and the second sealing ring 32 are Y-shaped sealing rings.

In the present embodiment, the side surface of the locking ring 6 has an external thread, and the locking ring 6 is screw-coupled with the inner wall of the housing 1 through the external thread. The holder through hole 50 is provided with a first step surface 51 and a second step surface 52, the first step surface 51 facing a side away from the pressure chamber 11, and the second step surface 52 facing the pressure chamber 11. In the present embodiment, the first step surface 51 is provided with a plurality of inner convex teeth 511 at intervals in the circumferential direction, and a gap between every two adjacent inner convex teeth 511 penetrates the hole wall of the holder through hole 50 and the outer side surface of the seal ring holder 5 to form the oil passage 57. The housing 1 is provided with a third step surface 13 and a convex ring 14 surrounding the third step surface 13, and the third step surface 13 is arranged opposite to the second step surface 52. Second step surface 52 is provided with an annular groove 54 that mates with male ring 14.

During assembly, the second seal ring 32 is first mounted adjacent to the third step surface 13, and then the seal ring holder 5 is abutted against the protruding ring 14, so that the protruding ring 14 extends into the annular groove 54, and the second seal ring 32 is held between the second step surface 52 and the third step surface 13. The first seal ring 31 is mounted close to the first step surface 51, and by tightening the locking ring 6, the locking ring 6 abuts against the end surface of the seal ring holder 5 on the side away from the pressure chamber 11 to fix the seal ring holder 5 and the second seal ring 32 to the housing 1, and the first seal ring 31 is held between the first step surface 51 and the locking ring 6. During assembly, the first sealing ring, the second sealing ring and the sealing ring support (namely the sealing structure) are directly placed into corresponding positions, and the locking ring is locked in a rotating mode at last, so that the installation process is greatly simplified compared with the prior art.

Furthermore, a fourth step surface 56 is arranged on the outer side surface of the seal ring support 5, the fourth step surface 56 faces to the side far away from the pressure chamber 11, an O-shaped seal ring 33 is sleeved outside the seal ring support 5, and the O-shaped seal ring 33 is pressed on the fourth step surface 56 by the locking ring 6.

The pressure chamber 11 can be vented and replenished with oil by the above-described structure, and the pressure can be reestablished. The realization method is as follows: the piston 2 moves under the pushing of the screw 81, when the end of the oil groove 21 far away from the pressure cavity 11 moves to the position between the first sealing ring and the second sealing ring, the pressure cavity 11 is communicated with the oil storage cavity 12 through the oil groove 21 and the oil channel 57 on the sealing ring support to establish an exhaust and oil supplement passage, hydraulic oil flows into the pressure cavity 11 from the oil storage cavity 12, and air in the pressure cavity 11 returns to the oil storage cavity 12 from an oil path, so that the exhaust function of the clutch actuator is realized, the air in the pressure cavity is exhausted, and the hydraulic performance is more stable.

In the present embodiment, the housing 1 includes a housing body 1a and an oil tank 1b, and the oil tank 1b is connected to one end of the housing body 1 a. An oil reservoir chamber 12, a pressure chamber 11, and a seal structure are provided in the oil tank 1b, the oil reservoir chamber 12 being located above the pressure chamber 11. The integrated structure is more compact in structure, the size and the weight of the actuator can be reduced, and meanwhile, the assembly process of production can be simplified. The housing body 1a is provided with a fixing flange 16, and the oil tank 1b is provided with an oil tank cap 10 b.

In this embodiment, the electronic control module 9 is connected to a transmission control unit (not shown in the drawings, i.e. a TCU) via an electrical plug 91, and receives a command from the transmission control unit, so that a certain current signal is input to the stator 71, and a change in the magnetic field in the stator 71 causes the rotor 72 to rotate. The rotor 72 is arranged in a rotationally fixed manner on a nut 82, the nut 82 being rotatable with the rotor 72. The threaded spindle 81 is injection molded in one piece with a limiting block 84, which is arranged in the guide bore 18 in a rotationally fixed manner, so that a rotary movement of the nut 82, after acting on the threaded spindle 81, converts a rotary movement of the nut 82 into a linear movement of the threaded spindle 81. The piston 2 is riveted on the screw 81, and moves linearly along the axial direction along with the screw 81, thereby pressurizing hydraulic oil (not shown) in the pressure chamber 11. The output oil pipe 19 is communicated with the pressure chamber 11 through a high-pressure passage 144, the output oil pipe 19 is connected with a clutch friction plate through a CRS clutch release bearing (not shown in the figure), and finally, the pressurized high-pressure oil acts on the clutch friction plate to control the connection and the disconnection of the clutch. The clutch may be a single clutch or a dual clutch DCT or other type of clutch. Fig. 1 shows a clutch actuator for a dual clutch transmission, which is formed by an upper part and a lower part, and the inner structures of the upper part and the lower part are completely identical, as can be seen from fig. 1.

FIG. 9 illustrates a cross-sectional schematic view of a clutch actuator according to an embodiment of the present invention from another angle. Referring to fig. 9, in the present embodiment, the electronic control module 9 includes a rotation angle sensor 91, a magnetic ring 92, a pressure sensor 93, a pressure signal processing module 94, a magnetic head 95, and a displacement sensor 96. The magnetic ring 92 is fixed to the rotor 72 by means of two-shot molding. The rotational angle sensor 91 is used to detect the change in magnetic field caused by the rotation of the magnetic ring 92 and to transmit a rotational angle detection signal to the transmission control unit, which adjusts the stator current to control the rotation of the rotor 72 and the nut 82 based on the actual rotational speed and torque of the rotor 72. The signal output end of the pressure sensor 93 is connected with the signal input end of the pressure signal processing module 94, and the pressure sensor 93 is used for detecting the pressure change of the liquid in the pressure chamber 11. For this purpose, a hydraulic channel 15 is provided in the housing 1, which communicates with the pressure chamber 11. The arrows in fig. 9 represent the direction of fluid flow in the hydraulic passage 15. The pressure signal processing module 94 is used for converting the pressure signal output by the pressure sensor 93 into an electric signal and transmitting the electric signal to an external gearbox control unit, so that the purpose of monitoring the hydraulic pressure in real time is achieved. The magnetic head 95 is fixedly mounted to the piston 2, and the displacement sensor 96 is configured to detect a change in the magnetic field caused by a displacement of the magnetic head and transmit a displacement detection signal to the transmission control unit. The gearbox control unit adjusts the current of the stator according to the actual displacement of the piston 2, thereby achieving the purpose of controlling the displacement of the piston 2. The gearbox control unit controls the rotation angle of the rotor 72 and the nut 82 through a rotation angle sensor, and further controls the axial displacement of the piston 2, and finally achieves the purpose of controlling the hydraulic pressure in the pressure chamber 11.

Further, the electronic control module 9 is provided with an opening through which the screw 81 passes, and the screw 81 passes through the opening, extends into the guide hole 18, and moves axially in the guide hole 18, so that the size of the product in the axial direction can be reduced.

In this embodiment, the electronic control module 9 has an electronic control module casing 1c, the electronic control module casing 1c is connected to the housing body 1a, and the electronic control module casing 1c has a cavity for accommodating the protruding column portion 71c, and the screw 81 and the limiting block 84 can move linearly therein. The electronic control module case 1c is also provided with a heat radiation plate 111 c. FIG. 10 illustrates a cross-sectional schematic view of a clutch actuator according to an embodiment of the present invention from yet another angle. Referring to fig. 10, the housing has a main working chamber 17 hermetically isolated from the pressure chamber 11, and the stator 71, the rotor 72, and the bearing 83 are disposed in the main working chamber 17. The shell 1 is provided with a ventilation joint 17a communicated with the main working cavity 17, the mouth of the ventilation joint 17a is provided with a ventilation plug 10, and the ventilation plug 10 is provided with a ventilation hole 101 to communicate the external atmosphere with the main working cavity 17, so that the pressure of the main working cavity 17 and the atmosphere can be balanced, and the influence of the positive pressure and the negative pressure of the main working cavity 17 on the response of an actuator is reduced.

Claims

1. A clutch actuator comprises a shell, a piston, a driving mechanism and a transmission mechanism; the housing is provided with a pressure chamber; the driving mechanism is connected with the piston through a transmission mechanism, and the transmission mechanism is used for converting the rotary motion of the driving mechanism into linear motion so as to drive the piston to axially move in the shell and apply pressure to the pressure medium filled in the pressure cavity; the driving mechanism comprises a stator and a rotor; the planetary roller screw comprises a screw rod and a nut; one end of the screw rod is connected with the piston, and the other end of the screw rod is connected with the limiting block; the shell or the stator is provided with a guide hole, and the limiting block can be axially moved but is not rotatably arranged in the guide hole; the nut is positioned between the piston and the limiting block, is connected with the rotor and can rotate along with the rotor; the bearing is fixedly arranged on the shell and sleeved outside the nut.

2. The clutch actuator of claim 1, wherein the rotor is annular and a portion of the outer circumferential surface of the nut is continuous with the inner circumferential surface of the rotor.

3. The clutch actuator of claim 1, wherein the piston comprises an over-molded part and an over-molded part, and the over-molded part is over-molded on an end surface and a side surface of the over-molded part near one end of the hydraulic cavity.

4. The clutch actuator of claim 1, wherein the bearing includes an outer race and an inner race, the outer race of the bearing is directly fixedly mounted to the housing, and the inner race of the bearing is disposed outside the nut and is rotatable with the nut.

5. The clutch actuator of claim 1, wherein a seal is disposed between the housing and the piston, and wherein the pressure chamber is collectively defined by the housing, the piston, and the seal;

the clutch actuator is provided with a locking ring and an oil storage cavity; the locking ring is fixedly connected with the shell and used for locking and fixing the sealing structure on the shell; the side of piston is equipped with the oil groove, seal structure is equipped with away oil passageway to make the oil in the oil storage chamber accessible is walked oil passageway and is flowed into it crosses the oil groove.

6. The clutch actuator of claim 5, wherein the housing includes a housing body and a reservoir connected to one end of the housing body;

the oil storage cavity, the pressure cavity and the sealing structure are all arranged in the oil tank, and the oil storage cavity is located above the pressure cavity.

7. The clutch actuator of claim 5 or 6, wherein the seal structure comprises a first seal ring, a second seal ring, and a seal ring carrier; the second sealing ring, the sealing ring bracket and the first sealing ring are sequentially arranged along the direction far away from the pressure cavity; the sealing ring support is provided with a support through hole, the piston sequentially penetrates through the locking ring, the first sealing ring, the support through hole and the second sealing ring, and the side surface of the piston is in sliding sealing contact with the first sealing ring and the second sealing ring; the oil feeding channel is arranged on the sealing ring bracket;

when the end of the oil passing groove of the piston, which is far away from the pressure cavity, moves to a position between the first sealing ring and the second sealing ring, the pressure cavity is communicated with the oil storage cavity through the oil passing groove and the oil passing channel so as to discharge air in the pressure cavity.

8. The clutch actuator according to claim 7, wherein the through hole of the bracket is provided with a first step surface facing a side away from the pressure chamber, the first step surface is provided with a plurality of inner convex teeth at intervals along the circumferential direction, and a gap between every two adjacent inner convex teeth penetrates through the outer side surface of the seal ring bracket to form the oil passage;

the first sealing ring is positioned between the first step surface and the locking ring;

the support through hole is provided with a second step surface, and the second step surface faces the pressure cavity; the shell is provided with a third step surface, and the third step surface is opposite to the second step surface;

the second sealing ring is positioned between the second step surface and the third step surface.

9. The clutch actuator of claim 8 wherein the housing includes a raised ring surrounding a third step surface; the second step surface is provided with an annular groove matched with the convex ring, and the convex ring extends into the annular groove;

the locking ring is abutted against the end face of the side, away from the pressure cavity, of the sealing ring support.

10. The clutch actuator of claim 5 wherein the outer side of the locking ring is threadably engaged with the inner wall of the housing.

11. The clutch actuator of claim 5 wherein the oil sump extends in an axial direction of the piston.

12. The clutch actuator of claim 1, wherein the clutch actuator comprises an electronic control module; the electronic control module is provided with an opening; the screw rod penetrates through the opening and extends into the guide hole.

13. The clutch actuator of claim 12, wherein the electronic control module comprises a rotational angle sensor, a magnetic ring, a pressure sensor, a pressure signal processing module, a magnetic head, and a displacement sensor;

the magnetic ring is fixedly arranged on the rotor, and the corner sensor is used for detecting the change of a magnetic field caused by the rotation of the magnetic ring and transmitting a corner detection signal to an external gearbox control unit;

the signal output end of the pressure sensor is connected with the signal input end of the pressure signal processing module, the pressure sensor is used for detecting the pressure change of the liquid in the pressure cavity, and the pressure signal processing module is used for converting the pressure signal output by the pressure sensor into an electric signal and transmitting the electric signal to an external gearbox control unit so as to achieve the purpose of monitoring the hydraulic pressure in real time;

the magnetic head is fixedly arranged on the piston, and the displacement sensor is used for detecting the magnetic field change caused by the displacement of the magnetic head and transmitting a displacement detection signal to the gearbox control unit.

14. The clutch actuator of claim 1 or 12 wherein the pilot hole is provided in the stator;

the stator comprises a stator body and a guide sleeve; one end of the stator body is provided with a convex column part, the convex column part and the guide sleeve are both provided with a central hole, and the guide sleeve is inserted into the central hole of the convex column part and is connected with the hole wall of the central hole of the convex column part; the central hole of the guide sleeve forms the guide hole.

15. The clutch actuator of claim 1, wherein the housing has a main working chamber sealed from each other with the pressure chamber, the stator, the rotor, and the bearing being disposed in the main working chamber;

the shell is provided with a ventilation joint communicated with the main working cavity, the opening of the ventilation joint is provided with a ventilation plug, and the ventilation plug is provided with a ventilation hole so as to communicate the external atmosphere with the main working cavity.