Built-in electromagnetic valve type variable damping force shock absorber

Abstract

The built-in electromagnetic valve type variable damping force shock absorber is high in integration degree and low in failure rate; an electromagnetic valve assembly is arranged in the lower end of a piston rod and comprises an electromagnetic coil, a valve seat, a movable piston, a fixed piston and a piston damping valve B. The upper end of the movable piston is connected with the valve seat through a spring, and a blocking piece is fixed to the lower end of the movable piston. The blocking piece is provided with an opening and is inserted into the fixed piston; in the power-off state, the opening in the blocking piece is inserted into the fixed piston to be blocked, so that oil cannot circulate in the fixed piston; during electrification, a magnetic field can be generated in the electromagnetic coil, so that the movable piston is attracted to drive the blocking piece to move upwards, an opening in the blocking piece communicates with an L-shaped flow channel in the fixed piston, and circulation of oil in the fixed piston is achieved; therefore, the damping force can be adjusted during electrification, vibration and jolt caused by uneven road surfaces during running of the vehicle are effectively reduced, and the driving comfort and the stability of the vehicle are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, in particular to a built-in electromagnetic valve type variable damping force shock absorber. Background Art

[0002] The automobile suspension system usually includes springs, shock absorbers, swing arms, etc.; springs are used to support the vehicle body, and shock absorbers are used to attenuate the vibration of the springs and stabilize the vehicle body. During the use of the car, the shock absorber is a key factor in ensuring the safety and comfort of the car. Traditional shock absorbers cannot reasonably adjust the damping size according to the specific road conditions, which reduces the comfort of riding. In response to this situation, electronically controlled shock absorbers have appeared on the market. A shock absorber that can adjust the damping force according to the analysis of the road conditions by the driving computer (ECU), so that the vehicle body can maintain the most comfortable state and improve driving stability. However, most of the electronically controlled shock absorbers on the market currently use the structure of an external solenoid valve, which has the following shortcomings: ① The required loading space is large, and the shock absorber is easy to interfere with other components; ② The connection between the solenoid valve and the shock absorber body is relatively weak. Under the influence of internal hydraulic pressure and external vibration, the solenoid valve has a high failure rate and the solenoid valve is easy to detach from the shock absorber body. Utility Model Content

[0003] The present application provides a variable damping force shock absorber with a built-in solenoid valve to overcome the above-mentioned problems existing in the prior art; the variable damping force shock absorber is capable of adjusting the damping force when power is turned on by arranging a solenoid valve assembly with a specific structure inside the piston rod, thereby effectively reducing the vibration and bumps caused by uneven road surfaces during driving, thereby improving driving comfort and vehicle stability; in addition, the variable damping force shock absorber of the present application adopts a built-in solenoid valve structure with a high degree of integration, a compact structure, a small installation space required, and a low failure rate.

[0004] The technical solution of this application is:

[0005] A variable damping force shock absorber with built-in solenoid valve comprises a liquid reservoir, a piston rod, an A piston damping valve and a floating piston arranged in the liquid reservoir; the A piston damping valve is connected to the piston rod; an upper end cover and a lower end cover are respectively arranged at both ends of the liquid reservoir; the piston rod is a hollow structure, the upper end of which extends from the upper end cover of the liquid reservoir and is connected to the liquid reservoir through an oil seal guide; a built-in solenoid valve assembly is arranged at the lower end of the piston rod; a power supply line of the built-in solenoid valve assembly is led out from the piston rod; an A oil chamber is formed between the A piston damping valve and the upper end cover, and a B oil chamber is formed between the A piston damping valve and the floating piston; an air chamber is formed between the floating piston and the lower end cover; the built-in solenoid valve assembly comprises an electromagnetic coil, a valve seat sealed to the inner wall of the piston rod, a fixed piston and a B piston damping valve; A movable piston is provided inside the valve seat; the upper end of the movable piston is connected to the valve seat by a spring, and a barrier plate is fixed to the lower end; an opening is provided on the barrier plate, and the barrier plate is inserted into the fixed piston; a liquid flow channel connected to the B oil chamber is provided at the lower end of the piston rod; a through hole connected to the A oil chamber is provided on the inner wall of the piston rod; a liquid flow hole connected to the liquid flow channel is provided on the B piston damping valve; an L-shaped flow channel is provided on the fixed piston; when no power is supplied, the opening on the barrier plate is inserted into the fixed piston and blocked, so that the L-shaped flow channel is blocked and the oil cannot flow in the fixed piston; when power is supplied, a magnetic field is generated in the electromagnetic coil, which attracts the movable piston to drive the barrier plate to move upward, so that the opening on the barrier plate is connected to the L-shaped flow channel, thereby realizing the circulation of oil in the fixed piston.

[0006] Compared with the prior art, the built-in solenoid valve type variable damping force shock absorber of the present application adopts a built-in solenoid valve type structure, which has a high degree of integration, a compact structure, a small installation space required, and a low failure rate. The variable damping shock absorber has a built-in solenoid valve assembly with a specific structure at the lower end of the piston rod, including an electromagnetic coil, a valve seat, a movable piston, a fixed piston, a B-piston damping valve, etc., wherein the upper end of the movable piston is connected to the valve seat by a spring, and a barrier plate is fixed to the lower end, and an opening is provided on the barrier plate and inserted into the fixed piston; in the initial state (that is, when no power is supplied), the opening on the barrier plate is inserted into the fixed piston and blocked, so that the oil cannot flow in the fixed piston; when power is supplied, a magnetic field is generated in the electromagnetic coil, thereby attracting the movable piston to overcome the elastic force of the spring and move upward, so as to drive the barrier plate to move, so that the barrier plate is blocked. The opening on the baffle is connected with the L-shaped flow channel to realize the circulation of oil in the fixed piston; at this time, when the piston rod moves downward, part of the oil in the B oil chamber will enter from the liquid flow channel, and flow into the L-shaped flow channel of the fixed piston from the liquid flow hole on the B piston damping valve, and then pass through the opening on the baffle, and finally flow into the A oil chamber from the through hole on the piston rod; when the piston rod moves upward, the oil flow direction is opposite; thus, the damping force can be adjusted when power is turned on, effectively reducing the vibration and bumps caused by uneven road surface during driving, and improving driving comfort and vehicle stability.

[0007] As an optimization, in the aforementioned built-in solenoid valve type variable damping force shock absorber, the opening includes a primary opening, a secondary opening and a tertiary opening that are interconnected and of different sizes. Under different currents, the distances moved by the movable piston are different, so the opening levels aligned with the L-shaped flow channel are also different, so that the damping force of the shock absorber can be changed in multiple stages under different currents. Furthermore, by adjusting the positions of the primary, secondary and tertiary openings, the solenoid valve assembly can be made normally closed or normally open, so that it can be applied to shock absorbers in different working occasions, meet the needs of different vehicle models, and have a wide range of uses; for example, the sizes of the primary opening, the secondary opening and the tertiary opening can be designed to increase from top to bottom in sequence, at which time the solenoid valve assembly is in a normally closed state, and the damping force becomes smaller after power is turned on; or the position of the opening can be moved up a certain distance as a whole, and the sizes of the primary opening, the secondary opening and the tertiary opening can be designed to decrease from top to bottom in sequence, at which time the solenoid valve assembly is in a normally open state, and the damping force becomes larger after power is turned on.

[0008] Furthermore, the barrier sheet is T-shaped, including a connecting portion and a barrier portion; the connecting portion is inserted from the end of the movable piston and is locked and fixed by bolts. In this case, the barrier sheet has a simple structure, is easy to assemble, and is easy to manufacture and has a low production cost.

[0009] As an optimization, in the aforementioned built-in solenoid valve type variable damping force shock absorber, the B piston damping valve includes a B valve body and a B valve plate group arranged on both sides of the B valve body; the B valve body is provided with two threaded holes; the B valve plate groups on both sides are respectively fixedly connected to the corresponding threaded holes, so that the two B valve plate groups are staggered. In this way, it is convenient to assemble the B piston damping valve and realize the circulation of oil in the solenoid valve assembly. Furthermore, a sealing ring is provided between the valve seat, the fixed piston, the B piston damping valve and the inner wall of the piston rod to improve the sealing between the valve seat, the fixed piston, the B piston damping valve and the piston rod.

[0010] As an optimization, in the aforementioned built-in solenoid valve variable damping force shock absorber, the piston rod is provided with two spaced guide sleeves, and a restoring buffer spring is provided between the two guide sleeves. The cooperation between the guide sleeve and the restoring buffer spring can prevent the internal structure from being damaged due to excessive impact pressure in a moment under special circumstances, further reduce the failure rate of the shock absorber, and also improve comfort.

[0011] As an optimization, in the aforementioned built-in solenoid valve type variable damping force shock absorber, the piston rod includes a rod body and a liquid inlet nozzle; the upper end of the liquid inlet nozzle is inserted into the rod body and sealed and fixed to the rod body, and the lower end passes through the A piston damping valve and is locked and fixed by a nut. At this time, the connection structure is simple and easy to install. Furthermore, a gasket is provided between the A piston damping valve and the nut. In this way, it can be avoided that the surface of the A piston damping valve is scratched when tightening the nut.

[0012] As an optimization, in the aforementioned built-in solenoid valve type variable damping force shock absorber, an air filling hole is opened in the middle of the lower end cover, and an air filling rivet is inserted into the air filling hole; the air filling rivet and the lower end cover are connected by projection welding. Therefore, the connection strength between the air filling rivet and the lower end cover can be ensured, and the sealing performance is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a built-in solenoid valve type variable damping force shock absorber of the present application;

[0014] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in FIG.

[0015] Figure 3 It is an assembly diagram of the valve seat, fixed piston, movable piston, and A piston damping valve in this application;

[0016] Figure 4 is a schematic diagram of a fixed piston in the present application;

[0017] Figure 5 is a schematic diagram of a valve body in the present application;

[0018] Figure 6 yes Figure 3 B-direction view of the barrier sheet;

[0019] Figure 7 This is the oil flow diagram when the piston rod moves downward when power is applied in Example 1 of the present application;

[0020] Figure 8 This is the oil flow diagram when the piston rod moves upward when power is turned on in Example 1 of the present application;

[0021] Fig. 9 It is a schematic diagram of the barrier sheet in Example 2 of the present application.

[0022] The markings in the attached drawings are: 1-liquid storage cylinder, 11-upper end cover, 12-lower end cover, 13-oil seal guide, 101-A oil chamber, 102-B oil chamber, 103-air chamber; 2-piston rod, 21-rod body, 22-oil inlet nozzle, 201-liquid flow channel, 202-through hole; 3-A piston damping valve; 4-floating piston; 5-solenoid valve assembly, 51-solenoid coil, 52-valve seat, 53-fixed piston, 531-L-type flow channel, 54-B piston damping Valve, 541-liquid flow hole, 542-valve body, 543-valve plate group, 544-threaded hole, 55-movable piston, 56-spring, 57-blocking plate, 571-opening, 5711-first-level opening, 5712-second-level opening, 5713-third-level opening, 572-connecting part, 573-blocking part, 58-bolt, 59-sealing ring, 501-power supply line; 6-guide sleeve; 7-restoring buffer spring; 8-nut; 9-gasket; 10-inflatable rivet. DETAILED DESCRIPTION

[0023] The present application is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present application.

[0024] Embodiment 1:

[0025] See also Figures 1 to 6The variable damping force shock absorber with built-in solenoid valve in this embodiment comprises a liquid reservoir 1 and a piston rod 2, an A piston damping valve 3 and a floating piston 4 arranged in the liquid reservoir 1; the A piston damping valve 3 is connected to the piston rod 2; an upper end cover 11 and a lower end cover 12 are respectively provided at both ends of the liquid reservoir 1; the piston rod 2 is a hollow structure, the upper end of which extends from the upper end cover 11 of the liquid reservoir 1 and is connected to the liquid reservoir 1 through an oil seal guide 13; a solenoid valve assembly 5 is built in the lower end of the piston rod 2; a power supply line 501 of the solenoid valve assembly 5 is led out from the piston rod 2; an A oil chamber 101 is formed between the A piston damping valve 3 and the upper end cover 11, and a B oil chamber 102 is formed between the A piston damping valve 3 and the floating piston 4; an air chamber 10 is formed between the floating piston 4 and the lower end cover 12 3; the solenoid valve assembly 5 includes an electromagnetic coil 51, a valve seat 52, a fixed piston 53 and a B piston damping valve 54 which are sealed and connected to the inner wall of the piston rod 2; a movable piston 55 is arranged inside the valve seat 52; the upper end of the movable piston 55 is connected to the valve seat 52 by a spring 56, and a barrier plate 57 is fixed to the lower end; an opening 571 is arranged on the barrier plate 57, and the barrier plate 57 is inserted into the fixed piston 53; a liquid flow channel 201 which is connected to the B oil chamber 102 is arranged at the lower end of the piston rod 2; a through hole 202 which is connected to the A oil chamber 101 is arranged on the inner wall of the piston rod 2; two liquid flow holes 541 which are connected to the liquid flow channel 201 are arranged on the B piston damping valve 54; an L-shaped flow channel 531 is arranged on the fixed piston 53. The A oil chamber 101 and the B oil chamber 102 are filled with damping oil; the air chamber 103 is filled with high-pressure nitrogen (2.0MPa) to provide a stable pressure for the internal working space of the shock absorber and improve the safety of use. When the power is off, the opening 571 on the barrier plate 57 is inserted into the fixed piston 53 and blocked, so that the L-shaped flow channel 531 is blocked and the oil cannot flow in the fixed piston 53; when the power is on, a magnetic field is generated in the electromagnetic coil 51, which attracts the movable piston 53 to drive the barrier plate 57 to move upward, so that the opening 571 on the barrier plate 57 is connected with the L-shaped flow channel 531, so that the oil can flow in the fixed piston 53.

[0026] See also Figure 3In this embodiment, the opening 571 includes a first-level opening 5711, a second-level opening 5712 and a third-level opening 5713 that are interconnected; the first-level opening 5711, the second-level opening 5712 and the third-level opening 5713 are arranged from top to bottom and increase in sequence. Thus, the damping force of the shock absorber can achieve multi-stage changes under different currents (the cross-sectional area of ​​the first-level opening 5711 is small, and the speed of its damping force adjustment change is slow; on the contrary, the cross-sectional area of ​​the third-level opening 5713 is large, and the speed of its damping force adjustment change is fast). At this time, the solenoid valve assembly 5 is in a normally closed state, and the damping force will become smaller after power is turned on. Further, the blocking piece 57 is T-shaped, including a connecting portion 572 and a blocking portion 573; the connecting portion 572 is inserted from the end of the movable piston 55 and is locked and fixed by a bolt 58; the blocking portion 573 is connected with the limit groove 532 on the fixed piston 53.

[0027] In this embodiment, the B piston damping valve 54 includes a valve body 542 (the valve body 542 is a powder metallurgy part) and valve plate groups 543 arranged on both sides of the valve body 542; two threaded holes 544 are provided on the valve body 542; the valve plate groups 543 on both sides are fixedly connected to the corresponding threaded holes 544, respectively, so that the two valve plate groups 543 are staggered. Both valve plate groups 543 are composed of a plurality of valve plates stacked together, so that the pressure in the oil storage cylinder 1 is kept constant and the flow rate of the damping oil can be slowed down. Furthermore, sealing rings 59 are provided between the valve seat 52, the fixed piston 53, and the B piston damping valve 54 and the inner wall of the piston rod 2. Furthermore, the fixed piston 53 is integrally formed by powder metallurgy injection molding, which is simple to produce and has high processing efficiency.

[0028] In this embodiment, two guide sleeves 6 are provided on the piston rod 2 at intervals, and a restoring buffer spring 7 is provided between the two guide sleeves 6 to prevent the internal structure of the shock absorber from being damaged due to excessive impact pressure in a moment under special circumstances, thereby further reducing the failure rate of the shock absorber and improving comfort.

[0029] In this embodiment, the piston rod 2 includes a rod body 21 and a liquid inlet nozzle 22; the upper end of the liquid inlet nozzle 22 is inserted into the rod body 21 and sealed and fixed to the rod body 21, and the lower end passes through the A piston damping valve 3 and is locked and fixed by the nut 8, and the liquid flow channel 201 is provided on the liquid inlet nozzle 22. In order to avoid scratching the surface of the A piston damping valve 3 when tightening the nut 8, a gasket 9 is provided between the A piston damping valve 3 and the nut 8. An inflation hole is opened in the middle of the lower end cover 12, and an inflation rivet 10 is inserted into the inflation hole; the inflation rivet 10 and the lower end cover 12 are connected by projection welding.

[0030] In the non-powered state: the piston rod 2 moves up and down, and the oil generates a damping force when passing through the A piston damping valve 3; the barrier 57 blocks the L-shaped flow channel 531, and the oil cannot flow in the fixed piston 53. In the powered state: when the piston rod 2 moves downward, part of the oil in the B oil chamber 102 will enter from the flow channel 201, and flow from the liquid flow hole 541 on the B piston damping valve 54 into the L-shaped flow channel 531 of the fixed piston 53, and then pass through the opening 571 on the barrier 57, and finally from the through hole 202 on the piston rod 2, and flow into the A oil chamber 101 (see Figure 7 ); When the piston rod 2 moves upward, the oil flow direction is opposite (see Figure 8 ); thereby, the damping force can be adjusted when power is turned on.

[0031] Embodiment 2:

[0032] See also Fig. 9 , the position of the opening 571 on the barrier sheet 57 in this embodiment is moved upward by a certain distance relative to the position of the opening 571 in the first embodiment, and the first-level opening 5711, the second-level opening 5712 and the third-level opening 5713 are arranged from top to bottom and decrease in size in sequence. At this time, the solenoid valve assembly 5 is in a normally open state, and the opening 571 and the L-shaped flow channel 531 are directly connected when no power is supplied; after power is supplied, the damping force of the shock absorber will increase.

[0033] The above general description of the utility model involved in this application and the description of its specific implementation method should not be understood as limiting the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation method (including examples) without violating the constituent elements of the utility model involved, to form other technical solutions within the scope of protection of this application.

Claims

1. Built-in solenoid valve type variable damping force shock absorber, characterized by: The invention comprises a liquid storage cylinder (1), a piston rod (2), an A piston damping valve (3) and a floating piston (4) arranged in the liquid storage cylinder (1); the A piston damping valve (3) is connected to the piston rod (2); the two ends of the liquid storage cylinder (1) are respectively provided with an upper end cover (11) and a lower end cover (12); the piston rod (2) is a hollow structure, the upper end of which extends out from the upper end cover (11) of the liquid storage cylinder (1) and is connected to the liquid storage cylinder (1) through an oil seal guide (13); the lower end of the piston rod (2) is built with an electromagnetic valve assembly (5); the electromagnetic valve assembly (5) is The electric wire (501) is led out from the piston rod (2); an A oil chamber (101) is formed between the A piston damping valve (3) and the upper end cover (11), and a B oil chamber (102) is formed between the A piston damping valve (3) and the floating piston (4); an air chamber (103) is formed between the floating piston (4) and the lower end cover (12); the solenoid valve assembly (5) comprises an electromagnetic coil (51), a valve seat (52) sealed with the inner wall of the piston rod (2), a fixed piston (53) and a B piston damping valve (54); a movable piston (55) is provided inside the valve seat (52) The upper end of the movable piston (55) is connected to the valve seat (52) via a spring (56), and a barrier plate (57) is fixed to the lower end; the barrier plate (57) is provided with an opening (571), and the barrier plate (57) is inserted into the fixed piston (53); the lower end of the piston rod (2) is provided with a liquid flow channel (201) connected to the B oil chamber (102); the inner wall of the piston rod (2) is provided with a through hole (202) connected to the A oil chamber (101); the B piston damping valve (54) is provided with a The fixed piston (53) is provided with an L-shaped flow channel (531); when no power is supplied, the opening (571) on the barrier plate (57) is inserted into the fixed piston (53) and blocked, so that the L-shaped flow channel (531) is blocked and the oil cannot flow in the fixed piston (53); when power is supplied, a magnetic field is generated in the electromagnetic coil (51), which attracts the movable piston (55) to drive the barrier plate (57) to move upward, so that the opening (571) on the barrier plate (57) is connected to the L-shaped flow channel (531), so that the oil can flow in the fixed piston (53).

2. The internal solenoid valve type variable damping force shock absorber according to claim 1, characterized in that: The opening (571) includes a primary opening (5711), a secondary opening (5712) and a tertiary opening (5713) which are interconnected and have different sizes.

3. The internal solenoid valve type variable damping force shock absorber according to claim 2, characterized in that: The sizes of the primary opening (5711), the secondary opening (5712) and the tertiary opening (5713) increase or decrease sequentially from top to bottom.

4. The internal solenoid valve type variable damping force shock absorber according to claim 3, characterized in that: The barrier sheet (57) is T-shaped and comprises a connecting portion (572) and a barrier portion (573); the connecting portion (572) is inserted from the end of the movable piston (55) and is locked and fixed by a bolt (58).

5. The internal solenoid valve type variable damping force shock absorber according to claim 1, characterized in that: The B-piston damping valve (54) comprises a valve body (542) and valve plate groups (543) arranged on both sides of the valve body (542); the valve body (542) is provided with two threaded holes (544); the valve plate groups (543) on both sides are respectively fixedly connected to the corresponding threaded holes (544), so that the two valve plate groups (543) are staggered in distribution.

6. The internal solenoid valve type variable damping force shock absorber according to claim 5, characterized in that: A sealing ring (59) is provided between the valve seat (52), the fixed piston (53), the B-piston damping valve (54) and the inner wall of the piston rod (2).

7. The internal solenoid valve type variable damping force shock absorber according to claim 1, characterized in that: The piston rod (2) is sleeved with two guide sleeves (6) which are spaced apart from each other, and a restoring buffer spring (7) is arranged between the two guide sleeves (6).

8. The internal solenoid valve type variable damping force shock absorber according to claim 1, characterized in that: The piston rod (2) comprises a rod body (21) and a liquid inlet nozzle (22); the upper end of the liquid inlet nozzle (22) is inserted into the rod body (21) and is sealed and fixed to the rod body (21), and the lower end passes through the A piston damping valve (3) and is locked and fixed by a nut (8).

9. The internal solenoid valve type variable damping force shock absorber according to claim 8, characterized in that: A gasket (9) is provided between the A-piston damping valve (3) and the nut (8).

10. The internal solenoid valve type variable damping force shock absorber according to claim 1, characterized in that: An air filling hole is provided in the middle of the lower end cover (12), and an air filling rivet (10) is inserted into the air filling hole; the air filling rivet (10) and the lower end cover (12) are connected by projection welding.

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