Clutch actuator

Abstract

A clutch actuator includes a housing, a piston, a driving mechanism and a transmission mechanism. The housing is provided with a pressure chamber. The driving mechanism is connected to the piston through the transmission mechanism. The transmission mechanism is used to convert the rotational motion of the driving mechanism into a linear motion to drive the piston to axially move in the housing and apply pressure to the pressure medium filled in the pressure chamber. The driving mechanism includes a stator and a rotor. The transmission mechanism includes a planetary roller screw, a bearing and a limiting block. The planetary roller screw includes a screw rod and a nut. One end of the screw rod is connected to the piston, and the other end of the screw rod is connected to the limiting block. The housing or the stator is provided with a guiding hole, and the limiting block is axially movable but non-rotatably arranged in the guiding hole. The nut is located between the piston and the limiting block and is connected to the rotor and can rotate following the rotor. The bearing is fixedly installed on the housing and sleeved outside the nut. The clutch actuator of the present invention has a compact structure, light weight and is easy to assemble.

Description

Technical Field

[0001] The present invention relates to a clutch for an automobile. Background Art

[0002] An existing clutch actuator for an automobile transmission has a master cylinder, which includes a housing and a piston that can axially move in the housing and load a pressure chamber filled with a pressure medium. The piston is driven by an electric motor having a stator and a rotor and performing rotational drive by means of a planetary roller transmission mechanism that can convert rotational drive into axial movement. Among them, the pressure chamber is arranged in a ring shape, and the piston is arranged in a "cup" shape so as to move in the annular pressure chamber to generate hydraulic pressure. The planetary roller transmission mechanism is received centrally in the radial interior of the pressure chamber, and the planetary roller transmission mechanism is supported relative to the housing at the end of the main shaft driven by the electric motor by means of a single radial bearing. The main shaft is directly sleeved in the radial interior of the rotor in a torsion-resistant manner. The pressure balance of the pressure chamber is arranged in a supplementary chamber of the housing and a reserve container connected to the housing and arranged outside the housing in a two-piece manner.

[0003] The above technical solutions mainly have the following deficiencies:

[0004] 1. In the above technical solution, the piston is arranged on the nut of the roller screw, and the piston is arranged in a "cup" shape structure. In this way, the volume of the pressure cylinder body will be increased, thereby increasing the volume and weight of the actuator system.

[0005] 2. In the above technical solution, the supplementary chamber and the oil storage chamber are arranged on the housing in a two-piece manner. In this way, the structure of the product will be complicated, and at the same time, an additional assembly process will be added, increasing the production cycle and manufacturing cost.

[0006] 3. In the above technical solution, the radial bearing is arranged on the drive shaft of the motor and the bearing cover and is finally fixed on the housing. In this way, the selected type of the radial bearing will be too small, and the axial load-bearing capacity is insufficient, ultimately resulting in the failure of the product. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a clutch actuator with a compact structure, light weight, and easy assembly.

[0008] An embodiment of the present invention provides a clutch actuator, which includes a housing, a piston, a driving mechanism, and a transmission mechanism; the housing is provided with a pressure chamber; the driving mechanism is connected to the piston through the transmission mechanism, and the transmission mechanism is used to convert the rotational motion of the driving mechanism into a linear motion to drive the piston to axially move in the housing and apply pressure to the pressure medium filled in the pressure chamber; the driving mechanism includes a stator and a rotor; it is characterized in that the transmission mechanism includes a planetary roller screw, a bearing, and a limiting block, and the planetary roller screw includes a screw rod and a nut; one end of the screw rod is connected to the piston, and the other end of the screw rod is connected to the limiting block; the housing or the stator is provided with a guiding hole, and the limiting block is axially movable but non-rotatably arranged in the guiding hole; the nut is located between the piston and the limiting block, and the nut is connected to the rotor and can rotate following the rotor; the bearing is fixedly installed on the housing and sleeved outside the nut.

[0009] The present invention has at least the following advantages:

[0010] 1. The driving mechanism of the embodiment of the present invention is composed of a stator and a rotor, and the transmission mechanism is composed of a planetary roller screw. Both ends of the screw rod of the planetary roller screw are respectively connected to the piston and the limiting block, and the nut of the planetary roller screw is connected to the rotor. The rotor, the screw rod, and the nut are radially supported in the housing by bearings. This integrated design has a compact overall structure and a small number of components, reducing the volume and weight of the product while meeting the performance and functions of the clutch actuator.

[0011] 2. The bearing is fixedly installed in the housing, increasing the radial dimension of the bearing, thereby improving the axial load-bearing capacity of the bearing and the entire clutch actuator.

[0012] 3. The oil storage chamber and the pressure chamber adopt an integrated design, which has a compact structure and reduces the volume and weight of the product.

[0013] 4. The electronic control module is provided with an opening through which the screw rod passes. The screw rod passes through this opening and axially moves in the guiding hole, thereby reducing the axial dimension of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shows a top view schematic diagram of a clutch actuator according to an embodiment of the present invention.

[0015] Figure 2 Shows Figure 1 The schematic cross-sectional view of K-K of

[0016] Figure 3 Shows Figure 2 The partial enlarged schematic diagram of

[0017] Figure 4 Shows a schematic structural diagram of a piston according to an embodiment of the present invention.

[0018] Figure 5 The structural schematic diagram of the metal part of the piston according to an embodiment of the present invention is shown.

[0019] Figures 6 to 8 The structural schematic diagrams of the seal ring bracket according to an embodiment of the present invention are shown from different angles respectively.

[0020] Figure 9 The cross-sectional schematic diagram of the clutch actuator according to an embodiment of the present invention is shown from another angle.

[0021] Figure 10 The cross-sectional schematic diagram of the clutch actuator according to an embodiment of the present invention is shown from yet another angle. Detailed implementation manners

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Please refer to Figures 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.

[0024] The driving mechanism is connected to the piston 2 through the transmission mechanism. The transmission mechanism is used to convert the rotational motion of the driving mechanism into a linear motion to drive the piston 2 to axially move in the housing 1 and apply pressure to the pressure medium filled in the pressure chamber 11. In this embodiment, the pressure medium is gearbox oil.

[0025] The driving mechanism includes a stator 71 and a rotor 72. The transmission mechanism includes a planetary roller screw, a bearing 83, and a limiting block 84. The planetary roller screw includes a screw rod 81, a nut 82, and planetary rollers (not shown in the figure) provided between the screw rod 81 and the nut 82. One end of the screw rod 81 is connected to the piston 2, and the other end of the screw rod 81 is connected to the limiting block 84. The stator 71 is provided with a guiding hole 18, and the limiting block 84 is axially movable but non-rotatably arranged in the guiding hole 18. The nut 82 is rotatably connected to the screw rod 81 through the planetary rollers and is located between the piston 2 and the limiting block 84. The nut 82 is connected to the rotor 72 and can rotate following the rotor 72. The bearing 83 is fixedly installed on the housing and sleeved outside the nut 82.

[0026] In this embodiment, the stator 71 is fixed within the housing 1. The stator 71 includes a stator body 71a and a guide sleeve 71b; one end of the stator body 71a is provided with a convex column portion 71c. Both the convex column portion 71c and the guide sleeve 71b have a central hole. The guide sleeve 71b is inserted into the central hole of the convex column portion 71c and is connected to the inner wall of the central hole of the convex column portion 71c. The connection method can be a fixed connection or integrally formed with the stator body 71a. The central hole of the guide sleeve 71b constitutes the above-mentioned guide hole 18. In other embodiments, the guide hole 18 can also be provided in the housing 1. The rotor 72 is annular, and a part of the outer peripheral surface of the nut 82 is connected to the inner peripheral surface of the rotor 72. The connection methods include but are not limited to interference fit, bonding, etc. The limiting block 84 is a sleeve, which is sleeved outside the screw 81 (it can be fixedly connected or integrally formed with the screw 81). Three arc protrusions are evenly arranged on the outer peripheral surface of the limiting block 84 along the circumferential direction, and arc grooves matching the three arc protrusions are provided on the inner peripheral surface of the guide hole 18.

[0027] Optionally, the bearing 83 is a ball bearing. The outer ring of the ball bearing is directly fixedly installed in the housing 1, and the inner ring of the ball bearing is sleeved outside the nut 82 (for example, the two are in interference fit) and can rotate with the nut 82. In the example shown in the figure, one end of the roller bearing 83 abuts against the bearing limit step 17 of the housing 1, and the other end abuts against the snap ring 85 fixed to the housing 1. The screw 81 and the nut 82 are radially supported in the housing 1 by the ball bearing 83. The inner ring of the ball bearing 83 is anti-rotationally arranged outside the nut 82. The advantage of this structure is that without increasing the volume of the actuator, the radial dimension of the ball bearing can be increased, thereby improving the axial load-bearing capacity of the ball bearing, further improving the axial load-bearing capacity of the entire actuator, and ultimately increasing the hydraulic pressure of the system to meet the requirements of a larger load of the clutch.

[0028] Please refer to Figure 4 and Figure 5 Figure. In this embodiment, the piston 2 includes a plastic-coated part 2a (plastic part) and a plastic-coated part 2b (metal part). The plastic-coated part 2a plastic-coats the end face and side face of the plastic-coated part 2b near the pressure chamber 11. A flat portion 23 is provided in the plastic-coated outer side area of the plastic-coated part 2b. The distance between the flat portion 23 and the central axis of the plastic-coated part 2b can be less than the diameter of the plastic-coated part 2b (i.e., Figure 5in the manner shown) or greater than the diameter of the plastic - encapsulated part 2b (i.e., a planar portion is formed by protruding a region radially along the outer side surface of the cylindrical plastic - encapsulated part 2b), which is used to prevent relative rotation of the plastic - encapsulated part 2a with respect to the plastic - encapsulated part 2b. An annular groove 24 is also provided in the outer side surface region of the plastic - encapsulated part 2b, and an annular protrusion 25 that mates with the annular groove is provided on the inner side surface of the plastic - encapsulated part 2a. The annular protrusion 25 and the annular groove 24 are in concave - convex fit, which is used to prevent axial detachment of the plastic - encapsulated part 2a with respect to the plastic - encapsulated part 2b and avoid failure of the piston structure during subsequent use. In another embodiment, an annular protrusion can also be provided in the outer side surface region of the plastic - encapsulated part 2b, and an annular groove that mates with the annular protrusion can be provided on the inner side surface of the plastic - encapsulated part 2a, or other types of grooves or protrusions can be used, which can also play a role in preventing axial detachment of the plastic - encapsulated part 2a with respect to the plastic - encapsulated part 2b. The piston of this embodiment is manufactured by the method of plastic - encapsulating a metal part. Compared with a piston made of all - metal parts, its weight is reduced, the bending moment applied to the bearing is reduced (an excessive bending moment will have an adverse effect on sealing), and it conforms to the lightweight design principle; compared with an all - plastic part, it can be directly and reliably connected to the screw in a simple manner (such as riveting, universal joint, bolt connection, etc.), and can increase the strength of the force - bearing part, and the processing cost is relatively low. The piston 2 is cylindrical, and on the premise of constant cross - sectional area, the volume of the piston can be reduced.

[0029] A sealing structure is provided between the housing 1 and the piston 2. The aforementioned pressure chamber 11 is jointly defined by the housing 1, the piston 2, and this sealing structure. The clutch actuator has a locking ring 6 and an oil storage chamber 12. The locking ring 6 is fixedly connected to the housing 1 and is used to lock and fix the sealing structure on the housing 1. An oil - passing groove 21 is provided on the side surface of the piston 2. The oil - passing groove 21 extends along the axial direction of the piston 2. Preferably, the number of the oil - passing grooves 21 is multiple, and the multiple oil - passing grooves 21 are spaced apart along the circumferential direction of the piston 2. The sealing structure is provided with an oil - passing channel 57 so that the oil in the oil storage chamber 12 can flow into the oil - passing groove 21 through the oil - passing channel 57.

[0030] The sealing structure includes a first sealing ring 31, a second sealing ring 32, and a sealing - ring bracket 5. The second sealing ring 32, the sealing - ring bracket 5, and the first sealing ring 31 are arranged in sequence along the direction away from the pressure chamber 11. The sealing - ring bracket 5 has a bracket through - hole 50. The piston passes through the locking ring 6, the first sealing ring 31, the bracket through - hole 50, and the second sealing ring 32 in sequence, 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 aforementioned oil - passing channel 57 is provided in the sealing - ring bracket 5. Optionally, the first sealing ring 31 and the second sealing ring 32 are Y - shaped sealing rings.

[0031] In this embodiment, the side surface of the locking ring 6 has an external thread, and the locking ring 6 is spirally connected to the inner wall of the housing 1 through this external thread. The bracket through-hole 50 is provided with a first step surface 51 and a second step surface 52. The first step surface 51 faces away from the pressure chamber 11, and the second step surface 52 faces the pressure chamber 11. In this embodiment, a plurality of inner convex teeth 511 are provided at intervals along the circumferential direction of the first step surface 51. The gap between every two adjacent inner convex teeth 511 penetrates through the hole wall of the bracket through-hole 50 and the outer side surface of the seal ring bracket 5 to form an 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. The third step surface 13 is disposed opposite to the second step surface 52. The second step surface 52 is provided with an annular groove 54 that matches the convex ring 14.

[0032] During assembly, first install the second seal ring 32 close to the third step surface 13, and then abut the seal ring bracket 5 against the convex ring 14 so that the convex 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. Install the first seal ring 31 close to the first step surface 51. By tightening the locking ring 6, the locking ring 6 abuts against the end surface of the seal ring bracket 5 on the side away from the pressure chamber 11 to fix the seal ring bracket 5 and the second seal ring 32 on the housing 1, and keep the first seal ring 31 between the first step surface 51 and the locking ring 6. During assembly, first directly place the first and second seal rings and the seal ring bracket (i.e., the sealing structure) in their corresponding positions, and finally rotate and tighten the locking ring, which greatly simplifies the installation process compared with the prior art.

[0033] Furthermore, the outer side surface of the seal ring bracket 5 is provided with a fourth step surface 56. The fourth step surface 56 faces away from the pressure chamber 11. An O-ring 33 is sleeved outside the seal ring bracket 5, and the locking ring 6 presses the O-ring 33 against the fourth step surface 56.

[0034] Through the above structure, the pressure chamber 11 can be exhausted, refueled, and the pressure can be re-established. The implementation method is as follows: The piston 2 moves under the push of the screw rod 81. When the end of the oil passage 21 away from the pressure chamber 11 moves between the first and second seal rings, the pressure chamber 11 is connected to the oil storage chamber 12 through the oil passage 21 and the oil passage 57 on the seal ring bracket to establish an exhaust and refueling passage. The hydraulic oil flows from the oil storage chamber 12 into the pressure chamber 11, and the air in the pressure chamber 11 returns to the oil storage chamber 12 from the oil circuit, thereby realizing the exhaust function of the clutch actuator, exhausting the air in the pressure chamber, and making the hydraulic performance more stable.

[0035] In this embodiment, the housing 1 includes a housing body 1a and a fuel tank 1b, and the fuel tank 1b is connected to one end of the housing body 1a. The oil storage chamber 12, the pressure chamber 11, and the sealing structure are all arranged in the fuel tank 1b, and the oil storage chamber 12 is located above the pressure chamber 11. This integrated structure is more compact in structure, can reduce the volume and weight of the actuator, and can also simplify the assembly process of production. A fixed flange 16 is provided on the housing body 1a, and a fuel tank cover 10b is provided on the fuel tank 1b.

[0036] In this embodiment, the electronic control module 9 is connected to the transmission control unit (not shown in the figure, the transmission control unit is the TCU for short) through an electrical plug 91, receives the instructions of the transmission control unit, and gives a certain current signal to the stator 71. The change of the magnetic field in the stator 71 causes the rotation of the rotor 72. The rotor 72 is anti-rotationally arranged on the nut 82, and the nut 82 can rotate together with the rotor 72. The screw 81 and the limiting block 84 are integrally formed by two-shot injection molding, and the limiting block is anti-rotationally arranged in the guide hole 18. Therefore, after the rotational movement of the nut 82 acts on the screw 81, the rotational movement of the nut 82 will be converted into the linear movement of the screw 81. The piston 2 is riveted and fixed on the screw 81 and will move linearly along the axis following the screw 81, and then will pressurize the hydraulic oil (not shown in the figure) in the pressure chamber 11. The output oil pipe 19 is communicated with the pressure chamber 11 through the high-pressure channel 144, and the output oil pipe 19 is also connected to the clutch friction plate through a CRS clutch release bearing (not shown in the figure). Finally, the pressurized high-pressure oil will act on the friction plate of the clutch to control the engagement and separation of the clutch. The clutch can be a single clutch or a dual clutch DCT or other types of clutches. Figure 1 Shown is a clutch actuator for a dual-clutch transmission, which consists of Figure 1 It can be seen that the clutch actuator is composed of two parts, the upper part and the lower part, and the internal structures of the upper and lower parts are exactly the same.

[0037] Figure 9 Another view shows a cross-sectional schematic diagram of the clutch actuator according to an embodiment of the present invention. Please combine with Figure 9As shown, in this 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 on the rotor 72 by means of two-shot injection molding. The rotation angle sensor 91 is used to detect the magnetic field change caused by the rotation of the magnetic ring 92 and transmit the rotation angle detection signal to the transmission control unit. The transmission control unit adjusts the current of the stator according to the actual speed and torque of the rotor 72 to control the rotation of the rotor 72 and the nut 82. The signal output end of the pressure sensor 93 is connected to the signal input end of the pressure signal processing module 94. The pressure sensor 93 is used to detect the liquid pressure change in the pressure chamber 11. For this purpose, a hydraulic channel 15 communicating with the pressure chamber 11 is provided in the housing 1. Figure 9 The arrow in represents the liquid flow direction in the hydraulic channel 15. The pressure signal processing module 94 is used to convert the pressure signal output by the pressure sensor 93 into an electrical signal and transmit it to the external transmission control unit to achieve the purpose of real-time monitoring of the hydraulic pressure. The magnetic head 95 is fixedly installed on the piston 2. The displacement sensor 96 is used to detect the magnetic field change caused by the displacement of the magnetic head and transmit the displacement detection signal to the transmission control unit. The transmission control unit adjusts the current of the stator according to the actual displacement of the piston 2, so as to achieve the purpose of controlling the displacement of the piston 2. The transmission control unit controls the rotation angle of the rotor 72 and the nut 82 through the rotation angle sensor, and then controls the axial displacement of the piston 2, and finally achieves the purpose of controlling the hydraulic pressure in the pressure chamber 11.

[0038] Furthermore, an opening through which the screw rod 81 passes is provided on the electronic control module 9. The screw rod 81 passes through this opening, extends into the guide hole 18 and axially moves in the guide hole 18, thereby reducing the size of the product in the axial direction.

[0039] In this embodiment, the electronic control module 9 has an electronic control module housing 1c. The electronic control module housing 1c is connected to the housing body 1a. The electronic control module housing 1c has a cavity for accommodating the protruding column portion 71c, and the screw rod 81 and the limiting block 84 can move linearly therein. A heat dissipation plate 111c is also provided on the electronic control module housing 1c. Figure 10 A cross-sectional schematic diagram of a clutch actuator according to an embodiment of the present invention is shown from another angle. Please refer to Figure 10 , the housing has a main working chamber 17 that is hermetically isolated from the pressure chamber 11. The stator 71, the rotor 72, and the bearing 83 are arranged in the main working chamber 17. The housing 1 is provided with a ventilation joint 17a communicating with the main working chamber 17. A ventilation plug 10 is provided at the mouth of the ventilation joint 17a. The ventilation plug 10 is provided with a ventilation hole 101 to communicate the outside atmosphere with the main working chamber 17, so as to balance the pressure between the main working chamber 17 and the atmosphere and reduce the influence of the positive and negative pressures in the main working chamber 17 on the actuator response.

Claims

1. A clutch actuator, comprising a housing, a piston, a driving mechanism and a transmission mechanism; the housing is provided with a pressure chamber; the driving mechanism is connected to the piston through the transmission mechanism, and the transmission mechanism is used to convert the rotational motion of the driving mechanism into a linear motion to drive the piston to axially move in the housing and apply pressure to the pressure medium filled in the pressure chamber; the driving mechanism includes a stator and a rotor; characterized in that, The transmission mechanism includes a planetary roller screw, a bearing, and a limiting block. The planetary roller screw includes a screw rod and a nut. One end of the screw rod is connected to the piston, and the other end of the screw rod is connected to the limiting block. The housing or the stator is provided with a guiding hole, and the limiting block is axially movable but non-rotatably arranged in the guiding hole. The nut is located between the piston and the limiting block, and the nut is connected to the rotor and can rotate with the rotor. The bearing is fixedly installed on the housing and sleeved outside the nut. A sealing structure is provided between the housing and the piston, and the pressure chamber is jointly defined by the housing, the piston, and the sealing structure. The sealing structure includes a first sealing ring, a second sealing ring, and a sealing ring bracket. The second sealing ring, the sealing ring bracket, and the first sealing ring are arranged in sequence along the direction away from the pressure chamber. The sealing ring bracket has a bracket through hole, and the piston sequentially passes through the locking ring, the first sealing ring, the bracket through hole, and the second sealing ring. The side surface of the piston is in sliding sealing contact with the first sealing ring and the second sealing ring. The clutch actuator has an oil storage chamber. An oil passage groove is provided on the side surface of the piston, and the sealing ring bracket is provided with an oil passage, so that the oil in the oil storage chamber can flow into the oil passage groove through the oil passage. When the end of the oil passage groove of the piston away from the pressure chamber moves between the first sealing ring and the second sealing ring, the pressure chamber communicates with the oil storage chamber through the oil passage groove and the oil passage to discharge the air in the pressure chamber.

2. The clutch actuator according to claim 1, characterized in that, The rotor is annular, and a part of the outer peripheral surface of the nut is connected to the inner peripheral surface of the rotor.

3. The clutch actuator according to claim 1, characterized in that, The piston includes a plastic-coated part and a part to be plastic-coated. The plastic-coated part plastics the end face and the side surface of the part to be plastic-coated close to the pressure chamber.

4. The clutch actuator according to claim 1, wherein, The bearing includes an outer ring and an inner ring. The outer ring of the bearing is directly fixedly installed on the housing, and the inner ring of the bearing is sleeved outside the nut and can rotate with the nut.

5. The clutch actuator according to claim 1, characterized in that, The clutch actuator has a locking ring. The locking ring is fixedly connected to the housing and is used to lock and fix the sealing structure on the housing.

6. The clutch actuator according to claim 5, characterized in that, The housing includes a housing body and an oil tank. The oil tank is connected to one end of the housing body. The oil storage chamber, the pressure chamber, and the sealing structure are all arranged in the oil tank, and the oil storage chamber is located above the pressure chamber.

7. The clutch actuator according to claim 1, characterized in that, The bracket through hole is provided with a first step surface. The first step surface faces away from the pressure chamber side, and a plurality of inner convex teeth are arranged at intervals along the circumferential direction. The gap between every two adjacent inner convex teeth penetrates the outer side surface of the sealing ring bracket to form the oil passage. The first sealing ring is located between the first step surface and the locking ring. The bracket through hole is provided with a second step surface. The second step surface faces the pressure chamber. The housing is provided with a third step surface, and the third step surface is arranged opposite to the second step surface. The second sealing ring is located between the second step surface and the third step surface.

8. The clutch actuator according to claim 7, wherein, The housing includes a convex ring surrounding the third step surface. The second step surface is provided with an annular groove matching with the convex ring, and the convex ring extends into the annular groove. The locking ring abuts against the end face of the sealing ring bracket on the side away from the pressure chamber.

9. The clutch actuator according to claim 5, wherein The outer side surface of the locking ring is spirally connected to the inner wall of the housing.

10. The clutch actuator according to claim 5, characterized in that, The oil passage groove extends along the axial direction of the piston.

11. The clutch actuator according to claim 1, characterized in that, The clutch actuator includes an electronic control module; the electronic control module is provided with an opening; the screw rod passes through the opening and extends into the guiding hole.

12. The clutch actuator according to claim 11, characterized in that, The electronic control module includes a rotation 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 installed on the rotor, and the rotation angle sensor is used to detect the magnetic field change caused by the rotation of the magnetic ring and transmit the rotation angle detection signal to the external gearbox control unit; The signal output end of the pressure sensor is connected to the signal input end of the pressure signal processing module. The pressure sensor is used to detect the liquid pressure change in the pressure chamber, and the pressure signal processing module is used to convert the pressure signal output by the pressure sensor into an electrical signal and transmit it to the external gearbox control unit to achieve the purpose of real-time monitoring of the hydraulic pressure; The magnetic head is fixedly installed on the piston, and the displacement sensor is used to detect the magnetic field change caused by the displacement of the magnetic head and transmit the displacement detection signal to the gearbox control unit.

13. The clutch actuator according to claim 1 or 12, characterized in that, The guiding hole is arranged in the stator; The stator includes a stator body and a guiding sleeve; one end of the stator body is provided with a convex column part, and both the convex column part and the guiding sleeve have a central hole. The guiding sleeve is inserted into the central hole of the convex column part and is connected to the hole wall of the central hole of the convex column part; the central hole of the guiding sleeve constitutes the guiding hole.

14. The clutch actuator according to claim 1, wherein, The housing has a main working chamber that is hermetically isolated from the pressure chamber, and the stator, the rotor, and the bearing are arranged in the main working chamber; The housing is provided with a ventilation joint communicated with the main working chamber. The mouth of the ventilation joint is provided with a ventilation plug, and the ventilation plug is provided with a ventilation hole to communicate the outside atmosphere with the main working chamber.

Images