Piston and composite electromagnetic suspension actuator

Abstract

The utility model discloses a piston and a combined type electromagnetic suspension actuator, belongs to the field of electromagnetic suspensions, and aims to provide better damping force while realizing rapid stretching. The piston head is fixed to the bottom of the piston rod, an elastic shifting piece is arranged in the piston head, and a small hole is formed in the elastic shifting piece. The piston rod is sleeved with the elastic poking piece, the outer side wall is fixed to the inner wall of the piston head, the inner side wall is free, and a check ring is pressed on the piston rod and located above the elastic poking piece to limit the elastic poking piece. Vibration reduction oil is injected into a vibration reduction oil cavity defined by the sealing device, the inner side wall of the oil storage cylinder and the floating piston. When the piston head moves downwards, the inner side of the elastic shifting piece cannot be bent upwards to be opened, and damping oil can only pass through the small hole in the elastic shifting piece. The piston head moves upwards, the inner side of the elastic shifting piece is completely jacked open, damping oil can pass through the small hole and an opening between the elastic shifting piece and the piston rod, the liquid flow area is increased, the drainage speed is increased, and the actuator can be rapidly stretched.

Description

Technical Field

[0001] The utility model belongs to the field of electromagnetic suspension, in particular to a piston and a composite electromagnetic suspension actuator. Background Art

[0002] Electromagnetic suspension (also known as magnetorheological or electromagnetic induction suspension) is an advanced suspension system used in cars and other vehicles. It uses electromagnetic technology to control the suspension characteristics of the vehicle to provide better driving comfort and handling performance. The electromagnetic suspension actuator is a key component in the electromagnetic suspension system of the vehicle. It is responsible for changing the damping characteristics or stiffness of the suspension system through electromagnetic force, thereby achieving real-time control of the vehicle's driving characteristics. It usually generates electromagnetic thrust through the relative movement of the mover and stator of the internal motor, and generates linear motion through electromagnetic thrust, thereby changing the stiffness of the suspension system and providing better damping. The whole process is controllable and rapid. In order to ensure the stability of the electromagnetic suspension system, a hydraulic structure is usually added to the electromagnetic suspension system. However, in the process of stretching and compressing the piston rod of the ordinary hydraulic structure, the liquid flows through the same flow channel. Under some road conditions with large amplitudes, it will generate great hydraulic resistance when stretched instantaneously, and the shock absorber cannot be stretched into place quickly. Utility Model Content

[0003] The utility model aims to provide a composite electromagnetic suspension actuator which can realize rapid stretching on the basis of meeting better damping requirements.

[0004] The technical solution adopted by the utility model is as follows: a piston comprises a piston rod, a piston head and an elastic paddle; the piston head is a hollow cylinder structure; one end of the piston rod is inserted into the hollow inner cavity of the piston head and connected with the piston head, and a liquid flow channel is formed between the piston head and the outer wall of the piston rod; the elastic paddle is adapted to the hollow inner cavity of the piston head, a mounting hole for allowing the piston rod to pass through is provided at the center of the elastic paddle, and small holes for allowing liquid to pass through are provided on the elastic paddle around the mounting hole; the elastic paddle is sleeved on the piston rod and is located in the hollow inner cavity of the piston head, the outer periphery of the elastic paddle is fixedly connected to the inner wall of the piston head, the inner side is freely matched with the piston rod, and a limiting structure for limiting the elastic paddle to be opened only on one side is provided between the piston rod and the elastic paddle.

[0005] Furthermore, the limiting structure includes a retaining ring pressed onto the piston rod, and the retaining ring is located above the elastic paddle.

[0006] The composite electromagnetic suspension actuator comprises a peripheral component, a spring, a guide seat, an end cover, a spring tray, a stator, an oil storage cylinder, a piston and a mover; the piston head of the piston is fixed to the bottom of the piston rod, a liquid flow channel is formed between the inner wall of the piston head and the outer wall of the bottom of the piston rod, an elastic paddle is arranged in the piston head, a small hole is arranged on the elastic paddle, the elastic paddle is sleeved on the piston rod, and its outer wall is fixed to the inner wall of the piston head, the inner wall is free, a retaining ring is pressed on the piston rod, and the retaining ring is located above the elastic paddle along the axial direction of the piston rod to limit the elastic paddle; the stator is fixed to the inner wall of the oil storage cylinder; the mover is fixed to the outer wall of the piston rod; the mover and the stator are movably matched; a floating piston and a sealing device are installed in the oil storage cylinder, the floating piston is located below the piston head, and the sealing device is located between the stator and the piston head; a damping oil chamber is surrounded by the sealing device, the inner wall of the oil storage cylinder and the floating piston, and damping oil is injected into the damping oil chamber.

[0007] Furthermore, the piston head is a cylindrical structure, including a cylindrical cylinder side wall and a cylinder bottom wall located at the bottom end of the cylinder side wall. A mounting through hole adapted to the piston rod is arranged at the center of the cylinder bottom wall, and liquid flow holes are evenly distributed on the cylinder bottom wall around the mounting through hole.

[0008] Furthermore, there are two liquid flow holes, each of which is arc-shaped, with an arc greater than 2π / 3 and less than or equal to 5π / 6; the liquid flow hole extends radially outward to be flush with the inner wall surface of the side wall of the cylinder, and the wall thickness of the partition between the liquid flow hole and the mounting through hole is consistent with the wall thickness of the side wall of the cylinder.

[0009] Furthermore, a nitrogen chamber is formed by the inner wall of the oil storage cylinder, the floating piston and the bottom wall of the oil storage cylinder, and nitrogen is injected into the nitrogen chamber.

[0010] Furthermore, the guide seat is installed on the top of the oil storage cylinder, and the end cover is pressed on the guide seat and the top of the oil storage cylinder; the spring tray is fixed to the outer wall of the oil storage cylinder; the peripheral component is installed on the top of the piston rod; the spring is sleeved on the peripheral component, its top end is connected to the peripheral component, and the bottom end is against the spring tray.

[0011] The beneficial effects of the utility model are as follows: the compound electromagnetic suspension actuator disclosed by the utility model, the stator and the mover form a linear propulsion unit, when they drive the actuator to compress, the piston head in the hydraulic structure moves downward, and the damping oil below the piston head pushes the inner side of the elastic paddle to deflect upward, but because the retaining ring blocks above the elastic paddle, the inner side of the elastic paddle cannot be bent upward and opened, and at this time the damping oil can only flow through the small hole on the elastic paddle. When the actuator is stretched, the piston head moves upward, and the damping oil above the piston head pushes the inner side of the elastic paddle to deflect downward until the inner side of the elastic paddle is completely pushed open, at this time the damping oil can not only pass through the small hole on the elastic paddle, but also through the opening between the elastic paddle and the piston rod, the liquid flow area is increased, the discharge speed is accelerated, the actuator can be stretched quickly, and the rapid response performance of the electromagnetic hydraulic composite suspension system is more superior. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view of the utility model;

[0013] Figure 2 is a top view of the elastic pick;

[0014] Figure 3 It is a top view of the piston head;

[0015] Figure 4 for Figure 3 AA section view.

[0016] In the figure, peripheral components 1, spring 2, guide seat 3, end cover 4, spring tray 5, stator 6, sealing device 7, vibration damping oil chamber 8, elastic paddle 9, mounting hole 9A, small hole 9B, retaining ring 10, floating piston 11, nitrogen chamber 12, oil storage cylinder 13, piston head 14, cylinder side wall 14A, cylinder bottom wall 14B, mounting through hole 14C, liquid flow hole 14D, piston rod 15, and mover 16. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] In this utility model, the terms "axial", "upper", "lower", etc. indicating directions are all attached. Figure 1 The following is based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] Piston, such as Figure 1-4As shown, it includes a piston rod 15, a piston head 14 and an elastic paddle 9; the piston head 14 is a hollow cylinder structure; one end of the piston rod 15 is inserted into the hollow inner cavity of the piston head 14 and connected to the piston head 14, and a liquid flow channel is formed between the piston head 14 and the outer wall of the piston rod 15; the elastic paddle 9 is adapted to the hollow inner cavity of the piston head 14, and a mounting hole 9A for the piston rod 15 to pass through is provided at the center of the elastic paddle 9, and a small hole 9B for the liquid flow to pass through is provided on the elastic paddle 9 around the mounting hole 9A; the elastic paddle 9 is sleeved on the piston rod 15 and located in the hollow inner cavity of the piston head 14, and its outer periphery is fixedly connected to the inner wall of the piston head 14, and the inner side is freely matched with the piston rod 15, and a limiting structure is provided between the piston rod 15 and the elastic paddle 9 to limit the elastic paddle 9 to only open on one side. The limiting structure includes a retaining ring 10 pressed on the piston rod 15, and the retaining ring 10 is located above the elastic paddle 9.

[0020] When a thrust is applied from above along the axial direction of the piston rod 15, only the small hole 9B on the elastic paddle 9 serves as a liquid flow passage. When a thrust is applied from below along the axial direction of the piston rod 15, not only the small hole 9B on the elastic paddle 9 serves as a liquid flow passage, but also an opening is formed between the piston rod 15 and the elastic paddle 9 as a liquid flow passage, resulting in different liquid flow areas on both sides. In actual application, rapid stretching of the piston can be achieved.

[0021] Compound electromagnetic suspension actuator, such as Figure 1 As shown, it includes a peripheral component 1, a spring 2, a guide seat 3, an end cover 4, a spring tray 5, a stator 6, an oil storage cylinder 13, a piston and a mover 16; the stator 6 is fixed to the inner wall of the oil storage cylinder 13; the mover 16 is fixed to the outer wall of the piston rod 15; the mover 16 and the stator 6 are movably matched, that is, a linear propulsion unit is formed between the mover 16 and the stator 6. The piston head 14 is fixed to the bottom of the piston rod 15, and a liquid flow channel is formed between the inner wall of the piston head 14 and the outer wall of the bottom of the piston rod 15, that is, the damping oil below the piston head 14 can flow into the top of the piston head 14 through the liquid flow channel. An elastic paddle 9 is arranged in the piston head 14, as shown in FIG. Figure 2 As shown, the elastic paddle 9 is provided with a small hole for the damping oil to pass through. The elastic paddle 9 is sleeved on the piston rod 15, and its outer wall is fixed to the inner wall of the piston head 14, and the inner wall is free, that is, the inner wall is not fixed to the piston rod 15, and it is movable. Under the action of thrust, the inner side of the elastic paddle 9 can bend, so that the inner wall of the elastic paddle 9 and the outer wall of the piston rod 15 are opened to form an opening for the damping oil to flow through. A retaining ring 10 is pressed on the piston rod 15, and the retaining ring 10 is located above the elastic paddle 9 along the axial direction of the piston rod 15 to limit the elastic paddle 9. In this way, due to the obstruction of the retaining ring 10, the elastic paddle 9 can only bend downward and open, but cannot bend upward and open.

[0022] A floating piston 11 and a sealing device 7 are installed in the oil storage cylinder 13. The floating piston 11 is located below the piston head 14. The sealing device 7 is located between the stator 6 and the piston head 14. The sealing device 7, the inner wall of the oil storage cylinder 13 and the floating piston 11 form a damping oil chamber 8. The damping oil is injected into the damping oil chamber 8. The sealing device 7 serves to separate the damping oil from the stator 6.

[0023] From the above, it can be known that the working process of the composite electromagnetic suspension actuator disclosed in the utility model is as follows: the stator 6 and the mover 16 form a linear propulsion unit to improve the damping requirements. At the same time, when they drive the actuator to compress, the piston head 14 in the hydraulic structure moves downward, and the damping oil below the piston head 14 pushes the inner side of the elastic paddle 9 to deflect upward, but because the retaining ring 10 blocks above the elastic paddle 9, the inner side of the elastic paddle 9 cannot be bent upward and opened. At this time, the damping oil 8 can only flow through the small holes on the elastic paddle 9. Replacing the type and number of elastic paddles 9 can adjust the damping size provided by the hydraulic pressure. When the actuator is stretched, the piston head 14 moves upward, and the damping oil above the piston head 14 pushes the inner side of the elastic paddle 9 to deflect downward until the inner side of the elastic paddle 9 is completely pushed open. At this time, the damping oil can pass not only through the small hole on the elastic paddle 9, but also through the opening between the elastic paddle 9 and the piston rod 15. The liquid flow area is increased and the discharge speed is accelerated, so that the actuator can be stretched quickly, making the rapid response performance of the electromagnetic hydraulic composite suspension system more superior.

[0024] The piston head 14 disclosed in this embodiment is a cylindrical structure. Figure 3 and Figure 4 As shown, it includes a cylindrical cylinder side wall 14A and a cylinder bottom wall 14B located at the bottom end of the cylinder side wall 14A, and a mounting through hole 14C adapted to the piston rod 15 is arranged at the center of the cylinder bottom wall 14B, and liquid flow holes 14D are evenly distributed on the cylinder bottom wall 14B around the mounting through hole 14C. The mounting through hole 14C is used for the piston rod 15 to be inserted and welded with the piston rod 15. The liquid flow hole 14D is used for the vibration damping oil to pass through.

[0025] If the liquid flow hole 14D is small, the flow resistance of the damping oil will increase. In this embodiment, in order to maximize the size of the liquid flow hole 14D, there are two liquid flow holes 14D, each of which is in an arc shape, and its arc is greater than 2π / 3 and less than or equal to 5π / 6; the liquid flow hole 14D extends radially outward to be flush with the inner wall surface of the cylinder side wall 14A, and the wall thickness of the partition between the liquid flow hole 14D and the mounting through hole 14C is consistent with the wall thickness of the cylinder side wall 14A.

[0026] Preferably, the inner wall of the oil storage cylinder 13, the floating piston 11 and the bottom wall of the oil storage cylinder 13 form a nitrogen chamber 12, and nitrogen is injected into the nitrogen chamber 12. By filling nitrogen into the nitrogen chamber 12, the floating piston 11 separates the nitrogen and the damping oil, and can move up and down according to the volume change in the chamber to achieve pressure balance. The floating piston and the nitrogen work together to supplement the volume change of the chamber when the piston rod 15 is stretched or compressed.

[0027] The guide seat 3 is installed on the top of the oil storage cylinder 13, and the end cover 4 is pressed on the guide seat 3 and the top of the oil storage cylinder 13; the spring tray 5 is fixed to the outer wall of the oil storage cylinder 13; the peripheral component 1 is installed on the top of the piston rod 15; the spring 2 is sleeved on the peripheral component 1, its top end is connected to the peripheral component 1, and the bottom end is against the spring tray 5.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A piston, characterized in that: The invention comprises a piston rod (15), a piston head (14) and an elastic paddle (9); the piston head (14) is a hollow cylindrical structure; one end of the piston rod (15) is inserted into the hollow inner cavity of the piston head (14) and connected to the piston head (14); a liquid flow channel is formed between the outer wall of the piston head (14) and the piston rod (15); the elastic paddle (9) is adapted to the hollow inner cavity of the piston head (14); a liquid flow channel for accommodating the piston rod (15) is provided at the center of the elastic paddle (9). A mounting hole (9A) is formed on the elastic paddle (9), and a small hole (9B) for allowing liquid to flow through is arranged around the mounting hole (9A); the elastic paddle (9) is sleeved on the piston rod (15) and is located in the hollow inner cavity of the piston head (14); its outer periphery is fixedly connected to the inner wall of the piston head (14), and its inner side is freely matched with the piston rod (15); a limiting structure is arranged between the piston rod (15) and the elastic paddle (9) to limit the elastic paddle (9) to be opened only on one side.

2. The piston according to claim 1, characterized in that: The limiting structure comprises a retaining ring (10) pressed onto the piston rod (15), and the retaining ring (10) is located above the elastic paddle (9).

3. A composite electromagnetic suspension actuator, comprising a stator (6), an oil storage cylinder (13), a piston and a mover (16), characterized in that: The piston is the piston as claimed in claim 1 or 2; the stator (6) is fixed to the inner wall of the oil storage cylinder (13); the mover (16) is fixed to the outer wall of the piston rod (15); the mover (16) and the stator (6) are movably matched; a floating piston (11) and a sealing device (7) are installed in the oil storage cylinder (13), the floating piston (11) is located below the piston head (14), and the sealing device (7) is located between the stator (6) and the piston head (14); a damping oil chamber (8) is surrounded by the sealing device (7), the inner wall of the oil storage cylinder (13) and the floating piston (11), and damping oil is injected into the damping oil chamber (8).

4. The compound electromagnetic suspension actuator according to claim 3, characterized in that: The piston head (14) is of cylindrical structure, comprising a cylindrical cylinder side wall (14A) and a cylinder bottom wall (14B) located at the bottom end of the cylinder side wall (14A), a mounting through hole (14C) adapted to the piston rod (15) is arranged at the center of the cylinder bottom wall (14B), and liquid flow holes (14D) are evenly distributed on the cylinder bottom wall (14B) around the mounting through hole (14C).

5. The compound electromagnetic suspension actuator according to claim 4, characterized in that: There are two liquid flow holes (14D), each of which is in an arc shape, and its curvature is greater than 2π / 3 and less than or equal to 5π / 6; the liquid flow hole (14D) extends radially outward to be flush with the inner wall surface of the cylinder side wall (14A), and the wall thickness of the partition between the liquid flow hole (14D) and the mounting through hole (14C) is consistent with the wall thickness of the cylinder side wall (14A).

6. The compound electromagnetic suspension actuator according to claim 3, characterized in that: A nitrogen chamber (12) is formed by the inner wall of the oil storage cylinder (13), the floating piston (11) and the bottom wall of the oil storage cylinder (13), and nitrogen is injected into the nitrogen chamber (12).

7. The compound electromagnetic suspension actuator according to claim 3, characterized in that: It also includes a peripheral component (1), a spring (2), a guide seat (3), an end cover (4) and a spring tray (5); the guide seat (3) is installed on the top of the oil storage cylinder (13), and the end cover (4) is pressed onto the guide seat (3) and the top of the oil storage cylinder (13); the spring tray (5) is fixed to the outer wall of the oil storage cylinder (13); the peripheral component (1) is installed on the top of the piston rod (15); the spring (2) is sleeved on the peripheral component (1), the top end of which is connected to the peripheral component (1) and the bottom end of which is against the spring tray (5).

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