Variable valve lift actuator, engine and vehicle

Abstract

The invention discloses a variable valve lift actuator, an engine and a vehicle, the actuator comprises a valve sleeve and a valve element, the valve element can move between an extending position and a retracting position relative to the valve sleeve, the actuator further comprises an electric drive assembly, the electric drive assembly comprises a drive part and a drive shaft acting with the drive part, and the drive part is used for driving the drive shaft to move in the axial direction; and the locking part is in sliding connection with the valve element, the locking part and the valve element are in limiting connection in the axial direction, and the driving shaft can drive the locking part to slide relative to the valve sleeve till the locking part abuts against the inner wall of the valve sleeve, so that locking of the driving shaft, the locking part and the valve sleeve is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle equipment, and in particular to a variable valve lift actuator, an engine and a vehicle. Background Art

[0002] In the field of reciprocating internal combustion engines, the camshaft controls the opening and closing of the engine valves through direct or indirect drive to coordinate the intake and exhaust of the engine cylinders. The valve lift of the traditional engine valve train is fixed, and the engine intake volume can only be adjusted by adjusting the throttle opening. This method cannot maximize the performance of the engine. The engine variable valve lift technology can match the appropriate valve lift according to different engine working conditions.

[0003] For example, when the engine is in an idling state, some valves are controlled to be closed for a long time to realize the cylinder deactivation function, which can save fuel and thus reduce emissions; when the engine is in a low load and low speed state, a low valve lift can be used to reduce pumping losses, thereby saving fuel and thus improving thermal efficiency; when the engine is in a high load and high speed state, a high valve lift is used to increase the engine's output power and torque, which can enhance power. In general, variable valve lift technology can better balance the engine's environmental protection, economy and power performance.

[0004] Common variable valve lifts are divided into continuously variable valve lift and multi-stage variable valve lift. There are two ways to achieve multi-stage variable valve lift. The first is a special rocker arm design, and the second is a sliding sleeve camshaft design. Among them, the sliding sleeve camshaft can change the valve lift by sliding the sleeve. The spiral groove on the sliding sleeve cooperates with the valve core extended from the variable valve lift actuator to drive the sleeve to move along the axial direction of the camshaft, thereby achieving cam and rocker arm coordination with different lifts.

[0005] However, when the axial position of the sleeve along the camshaft is changed, in order to ensure that the valve core of the variable valve lift actuator continues to extend, the variable valve lift actuator needs to be continuously powered, which causes energy waste.

[0006] In view of this, there is an urgent need to provide a technical solution that can maintain the extended state of the valve core of the variable valve lift actuator while saving energy. Summary of the invention

[0007] An object of the present invention is to provide a new technical solution for a variable valve lift actuator and an engine capable of achieving self-locking, thereby effectively saving energy.

[0008] In one aspect, the present invention provides a variable valve lift actuator, the actuator comprising a valve sleeve and a valve core, the valve core being movable relative to the valve sleeve between an extended position and a retracted position, the actuator further comprising:

[0009] The electric drive assembly comprises a drive unit and a drive shaft acting on the drive unit, wherein the drive unit is used to drive the drive shaft to move in an axial direction;

[0010] The locking part is slidably connected to the valve core, and the locking part and the valve core are connected in an axial upper limit position. The driving shaft can drive the locking part to slide relative to the valve sleeve until the locking part abuts against the inner wall of the valve sleeve to achieve locking of the driving shaft, the locking part and the valve sleeve.

[0011] According to the embodiment of the present invention, the driving part drives the driving shaft to move in the extension direction of the valve core, and the driving shaft drives the locking part to slide relative to the valve core to squeeze the inner wall of the valve sleeve until the locking part is under the friction force F f Under the action of, a lock is formed, so that the locking part is positioned between the drive shaft and the inner wall of the valve sleeve. At this time, the drive shaft, the locking part and the valve sleeve are interlocked with each other. Since the valve core and the locking part are connected in an axial limit, the locking part can move and lock in the axial direction together with the valve core. When the valve core is in the extended position or the retracted position, the valve core is locked in the extended position or the retracted position by the drive shaft, the locking part and the valve sleeve. When the valve core needs to switch between the extended position and the retracted position, the drive part is energized to drive the drive shaft to move in the retracting direction of the valve core, the drive shaft no longer presses the locking part against the valve sleeve, and the drive shaft, the locking part and the valve sleeve are released from interlocking.

[0012] By adopting the actuator of the present invention, the drive shaft moves axially to lock or unlock the valve core. When the valve core is in the extended position, the drive unit drives the drive shaft to move to form an interlock between the drive shaft, the valve sleeve and the locking unit. After the interlock is formed, the valve core is locked in the extended position, thereby avoiding the need to keep the valve core in the extended position by continuously energizing the actuator, thereby effectively saving energy.

[0013] Optionally, an axial hole and a mounting hole are provided at one end of the valve core close to the drive shaft, the mounting hole is connected to the axial hole and is arranged at an angle, the bottom end of the drive shaft extends into the axial hole, and the locking part is slidably connected to the mounting hole.

[0014] Optionally, a portion of the outer wall of the valve core forms a step surface, and when the valve core is in the extended position, the step surface cooperates with the valve sleeve to limit the position.

[0015] Optionally, at least one of the drive shaft and the locking portion that forms a match is provided with a guide surface.

[0016] Optionally, the position where the valve sleeve cooperates with the locking portion gradually shrinks along the extending direction of the valve core.

[0017] Optionally, the locking portion is spherical or rod-shaped.

[0018] Optionally, the driving part includes an electromagnet, and the driving shaft is located inside the electromagnet.

[0019] Optionally, it also includes a guide sleeve, and the electric drive assembly also includes a magnetic core, which is sleeved on the drive shaft and located inside the guide sleeve and axially limited with the guide sleeve.

[0020] Optionally, the electric drive assembly further comprises: a first elastic device capable of axial deformation, the first elastic device being used to drive the drive shaft to move along the direction in which the valve core extends.

[0021] Optionally, the valve sleeve is fixedly provided with a driving member, and the driving member is at least used to drive the valve core to move to the extended position.

[0022] Optionally, the driving member includes a second elastic device, and the second elastic device is abutted between the valve sleeve and the top end of the valve core.

[0023] Optionally, a mounting sleeve is fixedly provided on the top end of the valve sleeve, and the second elastic device abuts against the mounting sleeve.

[0024] Optionally, the mounting sleeve defines a receiving hole, and the second elastic device is disposed in the receiving hole.

[0025] On the other hand, the present invention provides an engine, which includes the above-mentioned variable valve lift actuator, and a camshaft arranged opposite to the actuator, a sliding sleeve is sleeved on the camshaft, a spiral groove is provided on the outer surface of the sliding sleeve, and the spiral groove includes a first position and a second position;

[0026] When the valve core is in the extended position, the valve core is matched with the first position to drive the sliding sleeve to move along the axial direction of the camshaft;

[0027] When the valve core is in the retracted position, the valve core is matched to the second position, and the groove bottom of the spiral groove located at the second position drives the valve core to retract.

[0028] In a third aspect, the present invention further provides a vehicle, comprising the above-mentioned engine.

[0029] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0031] Figure 1 It is a partial structural diagram of the engine;

[0032] Figure 2is a structural schematic diagram of a valve core of an actuator in an embodiment of the present invention being locked in a retracted position;

[0033] Figure 3 is a structural schematic diagram of a valve core of an actuator in an unlocked state in an embodiment of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the valve core of the actuator in an embodiment of the present invention being locked in the extended position.

[0035] Description of reference numerals:

[0036] 1. Actuator; 101. Valve core; 101a. Second end; 101b. First end; 101c. Mounting hole; 101d. Axial hole; 102. Valve sleeve; 102a. Valve port; 102b. Valve cavity; 102c. Inner wall of valve sleeve; 103. Locking portion; 104. Drive shaft; 104a. Bottom end of drive shaft; 104b. Top end of drive shaft; 105. Second elastic device; 106. Mounting sleeve; 107. Guide sleeve; 108. Magnetic core; 108a. Center hole; 109. Frame; 110. Electromagnet; 111. First elastic device; 112. Spring seat; 113. Housing; 114. Cover plate; 2. Sliding sleeve; 201. Spiral groove; 202. High lift cam; 203. Low lift cam; 3. Cover. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] It should be noted that the left, right, front and back of the context are based on Figure 2-Figure 4 From the perspective of FIG. 1 , the purpose is to clearly express the relative positions of the components, and it should not be understood as a limitation of the technical solution.

[0039] According to one embodiment of the present application, referring to Figure 1-Figure 4 The variable valve lift actuator 1 in this embodiment is described, and the variable valve lift actuator 1 includes a valve sleeve 102 and a valve core 101 that can move relative to the valve sleeve 102 and switch between an extended position and a retracted position. An electric drive assembly and a locking portion 103 are also arranged in the valve sleeve 102, and the electric drive assembly includes a drive portion and a drive shaft 104.

[0040] Specifically, if Figure 2-4As shown, the valve sleeve 102 is a cylindrical structure and encloses a valve cavity 102b, which is connected to the outside through the valve port 102a. The valve core 101 is arranged in the valve sleeve 102 and can extend and retract from the valve port 102a. The bottom end 104a of the drive shaft 104 extends into the valve sleeve 102 along the axial direction. The locking portion 103 is slidably connected to the valve core 101 and is also axially limited so that the locking portion 103 and the valve core 101 can move and lock together in the axial direction.

[0041] When the valve core 101 needs to be kept in the extended position, the driving unit drives the driving shaft 104 to move axially along the extension direction of the valve core 101, so as to drive the locking portion 103 to slide along the valve sleeve 102 to press the inner wall 102c of the valve sleeve 102 and lock it between the driving shaft 104 and the valve sleeve 102. At this time, the driving shaft 104, the valve sleeve 102 and the locking portion 103 form an interlocking, and the valve core 101 is also locked in the extended position through the locking portion 103. It can be understood that the valve core 101 can also be locked in the retracted position through the above structure. When the valve core 101 needs to switch from the retracted position to the extended position, the driving unit is energized to drive the driving shaft 104 to move along the retracted direction of the valve core 101, and the driving shaft 104 no longer presses the locking portion 103 against the valve sleeve 102. The driving shaft 104, the locking portion 103 and the valve sleeve 102 are released from interlocking. The driving member drives the valve core 101 to extend into place, the driving part is powered off, and the driving shaft 104 is pushed by the driving member to establish an interlocking relationship with the locking part 103 and the valve sleeve 102 .

[0042] When the valve core 101 needs to be switched from the extended position to the retracted position, the sliding sleeve 2 drives the valve core 101 to the retracted position. At this time, the driving shaft 104 is pushed by the elastic member to establish an interlocking relationship with the locking portion 103 and the valve sleeve 102.

[0043] By using the actuator of the present invention, the drive shaft 104 moves axially to lock or unlock the valve core 101. When the valve core 101 is in the extended position, the driving part drives the drive shaft 104 to move to form an interlock between the drive shaft 104, the valve sleeve 102 and the locking part 103. After the interlock is formed, the valve core 101 is locked in the extended position, thereby avoiding the need to keep the valve core 101 in the extended position by continuously energizing the actuator, thereby effectively saving energy.

[0044] In one example, the driving part is electromagnetically driven, and the driving part includes an electromagnet 110. The driving shaft 104 is located inside the electromagnet 110 and can be driven by the electromagnet 110. In this way, the driving shaft 104 is driven to move axially to lock and unlock the valve core 101 by energizing the electromagnet 110.

[0045] Alternatively, the electromagnet 110 is only used to drive the drive shaft 104 to move along the retraction direction of the valve core 101. When the drive shaft 104 moves along the extension direction of the valve core 101, the electromagnet 110 is not energized, and the drive shaft 104 falls by its own gravity to move along the extension direction of the valve core 101, thereby driving the valve core 101 to be locked.

[0046] Alternatively, the electric drive assembly further includes a first elastic device 111 that can be deformed in the axial direction, and the first elastic device 111 is used to drive the drive shaft 104 to move along the extending direction of the valve core 101 .

[0047] Specifically, see Figure 2-4 The actuator 1 further includes a housing 113 and a cover plate 114, and the cover plate 114 is covered on the top of the housing 113. The housing 113 is covered on the top of the valve sleeve 102, and the housing 113, the cover plate 114 and the top of the valve sleeve 102 form an upper cavity, and the electromagnet 110 is fixed in the upper cavity. One end of the first elastic device 111 is fixed to the cover plate 114, and the other end is fixed to the top of the magnetic core 108. For example, the first elastic device 111 is a first spring, and the top of the first spring is supported on the cover plate 114 through the spring seat 112. Under the action of external force, the drive shaft 104 can compress the first elastic device 111. When the drive shaft 104 is not affected by the external force, the compressed first spring applies an elastic reaction force to drive the drive shaft 104 to move. As a result, the drive shaft 104 can be driven to move with the help of the first elastic device 111, avoiding the need to energize the electromagnet 110 when the drive shaft 104 moves axially, thereby further saving energy.

[0048] Optionally, the actuator further includes a guide sleeve 107, which is fixedly mounted on the top of the valve sleeve 102, and is located in the upper cavity and inside the electromagnet 110. The electric drive assembly further includes a magnetic core 108, which is sleeved on the top of the drive shaft 104 and can move in the guide sleeve 107 and is axially limited with the guide sleeve 107.

[0049] For example, the magnetic core 108 defines a central hole 108 a , and the top end 104 b of the driving shaft 104 extends into the central hole 108 a and is interference fit with the hole wall to enable the magnetic core 108 and the driving shaft 104 to move together.

[0050] Optionally, the actuator further includes a frame 109 , and the electromagnet 110 is fixed in the upper cavity portion through the frame 109 to limit the electromagnet 110 axially and radially to prevent the electromagnet 110 from moving.

[0051] In a specific embodiment, an axial hole 101d and a mounting hole 101c are formed at one end of the valve core 101 close to the driving shaft 104. The mounting hole 101c is connected to the axial hole 101d and is arranged at an angle. The locking portion 103 is slidably connected to the mounting hole 101c.

[0052] The valve core 101 includes a first end 101b and a second end 101a, which are axially arranged. The first end 101b is located above the second end 101a and is an end of the valve core 101 close to the drive shaft 104. The second end 101a can extend from the valve sleeve 102.

[0053] The axial hole 101d is formed by the end surface of the first end portion 101b being recessed in the axial direction of the valve core 101, and the bottom end 104a of the drive shaft 104 can be extended into and out of the axial hole 101d. The mounting hole 101c extends along the hole wall of the axial hole 101d and penetrates the hole wall in the thickness direction. The mounting hole 101c connects the axial hole 101d with the valve sleeve 102. Therefore, when the bottom end 104a of the drive shaft 104 moves in the axial hole 101d, the outer wall of the drive shaft 104 can contact the locking portion 103 embedded in the mounting hole 101c, and drive the locking portion 103 to move in the valve cavity 102b to press the valve sleeve 102 to form an interlock. Thereby, the integration of the actuator 1 can be increased and the volume of the actuator 1 can be reduced.

[0054] Optionally, a portion of the outer wall of the valve core 101 forms a step surface, and when the valve core 101 is in the extended position, the step surface is limitedly matched with the valve sleeve 102.

[0055] For example, the valve core 101 is a step structure, and the radial dimension of the first end 101b is larger than the radial dimension of the second end 101a. The first end 101b forms a limit fit with the valve sleeve 102. When the second end 101a extends out of the valve port 102a, the end surface of the first end 101b connected to the second end 101a forms a limit fit with the valve sleeve 102.

[0056] In one embodiment, at least one of the driving shaft 104 and the locking portion 103 that are matched with each other is provided with a guide surface.

[0057] For example, see Figure 2-Figure 4 The bottom end 104a of the drive shaft 104 has an inverted tapered guide surface. The inner diameter of the bottom end 104a of the drive shaft 104 increases gradually from bottom to top. The locking portion 103 cooperates with the tapered surface of the bottom end 104a of the drive shaft 104 and the inner wall 102c of the valve sleeve 102.

[0058] Alternatively, the locking portion 103 is a rod-shaped structure, and the bottom end of the drive shaft 104 can drive the rod-shaped locking portion 103 to slide relative to the valve core 101 and form an interlocking. The surface of the locking portion 103 contacting the drive shaft 104 forms an inclined guide surface.

[0059] Alternatively, the locking portion 103 is a spherical structure, and the spherical surface itself has a guiding function.

[0060] Optionally, the position where the valve sleeve 102 cooperates with the locking portion 103 gradually shrinks along the extending direction of the valve core 101 .

[0061] like Figure 2-4 As shown, the inner wall 102c of the valve sleeve 102 and the locking portion 103 are arranged to cooperate with each other at an angle. Therefore, the conical surface of the bottom end 104a of the drive shaft 104 and the inner wall 102c of the valve sleeve 102 cooperate to limit the locking portion 103. The taper of the conical surface of the bottom end 104a of the drive shaft 104 and the inclination angle of the inner wall 102c of the valve sleeve 102 can be set by yourself so that when the drive shaft 104 moves axially, the locking portion 103 can form a self-locking.

[0062] In one example, a driving member is fixedly disposed on the valve sleeve 102 , and the driving member is at least used to drive the valve core 101 to move to the extended position.

[0063] For example, the driving member includes a second elastic device 105, and the second elastic device 105 is abutted between the valve sleeve 102 and the top of the valve core 101. The valve sleeve 102 is provided with a second elastic device 105 connected to the top of the valve core 101. The second elastic device 105 is arranged along the axial direction and can be deformed along the axial direction. When the valve core 101 retracts into the valve sleeve 102, the second elastic device 105 compressed by the valve core 101 applies an elastic reaction force to the valve core 101 to drive the valve core 101 to extend out of the valve sleeve 102.

[0064] For example, a mounting sleeve 106 is fixedly disposed at the top of the valve sleeve 102, and the drive shaft 104 passes through the mounting sleeve 106. The mounting sleeve 106 is built into the guide sleeve 107, and the drive shaft 104 enters the cavity after passing through the mounting sleeve 106. The end of the second elastic device 105 away from the valve core 101 is fixedly disposed on the mounting sleeve 106.

[0065] Optionally, in order to prevent the second elastic device 105 from bending and radial movement during axial deformation, the mounting sleeve 106 is provided with a receiving hole, and the second elastic device 105 is arranged in the receiving hole. The receiving hole extends in the axial direction, and the inner diameter of the receiving hole matches the radial dimension of the second elastic device 105. The second elastic device 105 is a second spring, and the end of the second spring connected to the valve core 101 can extend out of the receiving hole and can also be compressed back into the receiving hole by the valve core 101.

[0066] like Figure 1 As shown, the present invention protects an engine, which includes the above-mentioned actuator 1, a camshaft, and a cover 3 arranged relative to the camshaft. A sliding sleeve 2 is sleeved on the camshaft. A spiral groove 201 is constructed on the outer surface of the sliding sleeve 2. The actuator 1 is fixed on the cover 3.

[0067] The camshaft is also provided with at least one low lift cam 203 and at least one high lift cam 202. When the sliding sleeve 2 moves axially, the corresponding low lift cam 203 or high lift cam 202 can be switched for use.

[0068] The spiral groove 201 has a first position and a second position. When the actuator 1 is adapted to the first position, the valve core 101 of the actuator 1 cooperates with the groove wall of the spiral groove 201 to drive the sliding sleeve 2 to move axially along the camshaft; when the sliding sleeve 2 moves axially to a set position, the actuator 1 cooperates with the second position of the spiral groove 201. In the second position, the groove bottom of the spiral groove 201 is shallow. When the actuator 1 is in an unlocked state, the groove bottom of the spiral groove 201 can push the valve core 101 back into the valve chamber 102b.

[0069] The working mode of the actuator 1 in the present invention is described below by way of example.

[0070] First process

[0071] See also Figure 2 and Figure 3 When the sliding sleeve 2 slides into place and no longer needs to be moved, the valve core 101 of the actuator 1 will enter a shallower position in the spiral groove 201 (i.e., the second position), so that the bottom of the spiral groove 201 pushes the valve core 101 to move upward and compresses the second elastic device 105, causing the second elastic device 105 to deform, thereby storing part of the energy in the second elastic device 105.

[0072] When the valve core 101 is retracted into the valve sleeve 102, the electromagnet 110 is not energized. The elastic reaction force of the compressed first elastic device 111 drives the drive shaft 104 to move downward, and the bottom end of the magnetic shaft squeezes the locking portion 103 and drives it to move radially outward until the locking portion 103 presses the inclined inner wall of the valve sleeve 102, thereby f The valve core 101 is self-locked under the action of the valve body 102, so that the valve core 101 cannot move downward and remains in a retracted state. The second elastic device 105 is compressed to a minimum length, and energy storage is completed.

[0073] Second process

[0074] See also Figure 4 When the sliding sleeve 2 needs to move, the electromagnet 110 is energized, and the magnetic core 108 exerts an electromagnetic force F on the electromagnet 110. 110 The elastic force F of the first elastic device 111 is overcome by 111， The driving shaft 104 is driven to move upward, thereby compressing the first elastic device 111 .

[0075] At this time, the bottom end 104a of the driving shaft 104 no longer presses the locking portion 103, and the friction force F fThe valve core 101 is released by the force F exerted by the first elastic device 111. 105 The valve core 101 moves downward under the driving force of the valve body 102 , and the second end 101a of the valve core 101 extends out of the valve cavity 102b under the action of the elastic reaction force of the second elastic device 105 .

[0076] The third process

[0077] When the valve core 101 is extended to the right position, the electromagnet 110 can be powered off. The first elastic device 111 recovers its deformation and drives the drive shaft 104 to move downward. The bottom end of the drive shaft 104 squeezes the locking portion 103 again and moves outward in the mounting hole 101c until the locking portion 103 presses the inner wall 102c of the valve sleeve 102. The locking portion 103 is under the friction force F f The valve core 101 is self-locking under the action of the locking portion 103 so as to be kept in the extended position.

[0078] Until the valve core 101 enters the second position of the spiral groove 201, the valve core 101 will be pushed by the bottom of the spiral groove 201 to retract into the valve cavity 102b again, so as to repeat the first process in this embodiment.

[0079] By adopting the technical solution of the present invention, in the three processes of the present invention, the electromagnet 110 is energized to unlock the valve core 101 only when the sliding sleeve 2 needs to move, and the electromagnet 110 can be closed when the valve core 101 is in the extended position. Even if the electromagnet 110 is closed, the valve core 101 can be kept in the extended position to cooperate with the spiral groove 201 of the sliding sleeve 2 to drive the sliding sleeve 2 to move, thereby significantly saving energy.

[0080] Optionally, those skilled in the art may adjust the response speed of the actuator 1 by adjusting the height of the first elastic device 111 and the inclination angle of the inner wall 102 c of the valve sleeve 102 .

[0081] At the same time, the energy for the valve core 101 to extend out of the valve cavity 102b comes from the second elastic device 105, and every time the valve core 101 is pushed into the valve cavity 102b by the groove bottom, the second elastic device 105 can automatically store energy, thereby further saving electric energy.

[0082] The present invention also provides a vehicle, which comprises the above engine.

[0083] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A variable valve lift actuator, comprising a valve sleeve (102) and a valve core (101), wherein the valve core (101) is movable relative to the valve sleeve (102) between an extended position and a retracted position, wherein: Also includes: An electric drive assembly comprises a drive unit and a drive shaft (104) interacting with the drive unit, wherein the drive unit is used to drive the drive shaft (104) to move axially; The locking portion (103) is slidably connected to the valve core (101), and the locking portion (103) and the valve core (101) are connected in an axial upper limit position. The driving shaft (104) can drive the locking portion (103) to slide relative to the valve sleeve until the locking portion abuts against the inner wall (102c) of the valve sleeve (102), so as to achieve locking of the driving shaft, the locking portion and the valve sleeve.

2. The actuator according to claim 1, characterized in that: An axial hole (101d) and a mounting hole (101c) are provided at one end of the valve core (101) close to the drive shaft (104); the mounting hole (101c) is connected to the axial hole (101d) and is arranged at an angle; the bottom end (104a) of the drive shaft (104) extends into the axial hole (101d); and the locking portion (103) is slidably connected to the mounting hole (101c).

3. The actuator according to claim 1, characterized in that: A part of the outer wall of the valve core forms a step surface, and when the valve core (101) is in the extended position, the step surface is limitedly matched with the valve sleeve (102).

4. The actuator according to claim 1, characterized in that: At least one of the driving shaft (104) and the locking portion (103) that are matched is provided with a guide surface.

5. The actuator according to claim 4, characterized in that: The position where the valve sleeve (102) cooperates with the locking portion (103) gradually shrinks along the extension direction of the valve core (101).

6. The actuator according to any one of claims 1 to 5, characterized in that: The locking portion (103) is spherical or rod-shaped.

7. The actuator according to any one of claims 1 to 5, characterized in that: The driving part comprises an electromagnet (110), and the driving shaft (104) is located inside the electromagnet (110).

8. The actuator according to claim 7, characterized in that: It also includes a guide sleeve (107), and the electric drive assembly also includes a magnetic core (108), the magnetic core (108) is sleeved on the drive shaft (104), and is located in the guide sleeve (107) and is axially limited with the guide sleeve (107).

9. The actuator according to claim 8, characterized in that: The electric drive assembly further comprises: a first elastic device (111) capable of axial deformation, wherein the first elastic device (111) is used to drive the drive shaft (104) to move along the extension direction of the valve core (101).

10. The actuator according to any one of claims 1 to 5, characterized in that: The valve sleeve (102) is fixedly provided with a driving member, and the driving member is at least used to drive the valve core (101) to move to an extended position.

11. The actuator according to claim 10, characterized in that: The driving member comprises a second elastic device (105), and the second elastic device (105) abuts against the top ends of the valve sleeve (102) and the valve core (101).

12. The actuator according to claim 11, characterized in that: A mounting sleeve (106) is fixedly disposed at the top end of the valve sleeve (102), and the second elastic device (105) abuts against the mounting sleeve (106).

13. The actuator according to claim 12, characterized in that: The installation sleeve (106) is provided with a receiving hole, and the second elastic device (105) is arranged in the receiving hole.

14. An engine, characterized in that: Comprising the variable valve lift actuator according to any one of claims 1 to 13 and a camshaft arranged opposite to the actuator, wherein a sliding sleeve (2) is sleeved on the camshaft, a spiral groove (201) is provided on the outer surface of the sliding sleeve (2), and the spiral groove (201) includes a first position and a second position; When the valve core (101) is in the extended position, the valve core (101) cooperates with the first position to drive the sliding sleeve (2) to move along the axial direction of the camshaft; When the valve core (101) is in the retracted position, the valve core (101) cooperates with the second position, and the groove bottom of the spiral groove (201) located in the second position drives the valve core to retract.

15. A vehicle, characterized in that: Comprising the engine as claimed in claim 14.

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