Proportional electromagnetic valve for automobile suspension damping shock absorber

Abstract

The utility model relates to the field of proportional electromagnetic valves, and discloses a proportional electromagnetic valve for an automobile suspension damping shock absorber, a main valve shell, a pilot valve spring fixing seat and a pilot valve core are sequentially arranged in a proportional electromagnetic valve sleeve from right to left, and a main valve core is arranged in the main valve shell. A main valve element spring is arranged between the left end of the main valve element and the inner wall of the left end of the main valve shell, a main valve seat is installed at the right end of the main valve shell, a failure safety protection valve seat is further arranged between the left end of the main valve shell and the table top of the proportional electromagnetic valve sleeve in a press fit mode, and a failure safety spring piece is arranged at the left end of the failure safety protection valve seat in a left-right moving mode. A failure safety protection pressure adjusting spring is arranged between the failure safety spring piece and the pilot valve spring fixing seat, and a safety protection structure after proportional adjustment failure is arranged in the proportional electromagnetic valve, so that the required suspension damping force can be provided after the valve fails.

Description

Technical Field

[0001] The utility model relates to the field of proportional solenoid valves, in particular to a proportional solenoid valve for an automotive suspension damping shock absorber. Background Art

[0002] With the application of new technologies in semi-active adjustable damping suspension systems, they can not only be integrated with high-order autonomous driving in the vehicle system to greatly improve the riding comfort, but also interact with the electronic hydraulic brake system (EHB / EMB) to enhance the vehicle safety. The core component in the semi-active adjustable damping suspension system is the damping proportional solenoid valve. The main function of the damping proportional solenoid valve is to adjust the damping force of the shock absorber through electromagnetic control, thereby affecting the flow rate of the hydraulic oil, and ultimately achieving the purpose of adjusting the performance of the shock absorber. Specifically, the solenoid valve plays a crucial role in the working process of the shock absorber. When the solenoid valve is energized, it generates an electromagnetic force to push the internal components to move, thereby changing the size of the oil passage gap. This change in the gap further affects the flow rate of the hydraulic oil, and finally adjusts the damping force of the shock absorber. When the proportional solenoid valve is de-energized or the control circuit fails due to certain reasons, it cannot continue to provide the corresponding shock absorption function. Therefore, we have designed a proportional solenoid valve for an automotive suspension damping shock absorber. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides a proportional solenoid valve for an automotive suspension damping shock absorber.

[0004] The utility model is realized by adopting the following technical solutions: A proportional solenoid valve for an automotive suspension damping shock absorber includes a coil assembly. A proportional solenoid valve sleeve is installed on the coil assembly. Inside the proportional solenoid valve sleeve, a main valve housing, a pilot valve spring fixing seat, and a pilot valve spool are sequentially installed from right to left;

[0005] A main valve spool is installed inside the main valve housing. A main valve spool spring is arranged between the left end of the main valve spool and the inner wall of the left end of the main valve housing, and a main valve seat is installed at the right end of the main valve housing;

[0006] A fail-safe protection valve seat is also press-fitted between the left end of the main valve housing and the table surface of the proportional solenoid valve sleeve. A fail-safe spring piece is arranged to move left and right at the left end of the fail-safe protection valve seat. A fail-safe protection pressure regulating spring is arranged between the fail-safe spring piece and the pilot valve spring fixing seat;

[0007] The pilot valve spool slides left and right inside the proportional solenoid valve sleeve. A pilot valve spool shaft is fixed in the middle of the pilot valve spool. The pilot valve spool shaft slides left and right through the pilot valve spring fixing seat and the fail-safe protection valve seat and extends into the left end of the main valve housing. A pilot valve spring is also sleeved on the pilot valve spool shaft. The left and right ends of the pilot valve spring are respectively abutted against the pilot valve spool and the pilot valve spring fixing seat.

[0008] As a further improvement of the above solution, a pilot valve sliding bearing is press-fitted at the left end inside the proportional solenoid valve sleeve, and a pilot valve sliding bearing is press-fitted at the right end of the pilot valve spring fixing seat. The pilot valve spool shaft slides on the two pilot valve sliding bearings. A total of 2 pilot valve sliding bearings are required in this proportional solenoid valve. These two pilot valve sliding bearings are fixed in the proportional solenoid valve sleeve and the pilot valve spool by interference press-fitting, playing a supporting role for the pilot valve sliding bearings at both ends.

[0009] As a further improvement of the above solution, the pilot valve spool shaft and the pilot valve spool are connected together by extrusion riveting and are coaxially designed.

[0010] As a further improvement of the above solution, a pilot valve piece and a pilot valve piece fixing ring are provided at the right end part of the pilot valve spool shaft placed in the fail-safe valve seat. The pilot valve piece is restricted on the pilot valve spool shaft by the pilot valve fixing ring. Due to the spring force of the pilot valve spring, the pilot valve piece fits on the right side surface of the fail-safe valve seat to form a sealing effect.

[0011] As a further improvement of the above solution, a round hole is provided in the middle of the fail-safe valve seat. The pilot valve spool shaft is placed at the right end of the fail-safe valve seat through the round hole, and the size of the pilot valve piece is larger than the size of the round hole, which can block it and is also convenient for the flow of oil.

[0012] The axis of the inner circle of the fail-safe spring piece is collinear with the axis of the round hole, which is used for the flow of oil when adjusting the damping working mode proportionally.

[0013] As a further improvement of the above solution, a throttle orifice is also provided above the fail-safe valve seat. The throttle orifice contacts the left side surface of the fail-safe spring piece, and the fail-safe spring piece can block it to form a sealing structure.

[0014] As a further improvement of the above solution, an oil inlet is provided at the right end of the main valve seat, and throttle orifices are provided on both the main valve housing and the main valve spool. The damping force can be changed by respectively changing the size or quantity of the throttle holes in the main valve housing or adjusting the pre-tightening force and stiffness of different fail-safe pressure protection springs, or the required throttling characteristics can be achieved by appropriate combination. The characteristics requirements for low-speed damping can be met by changing the type, number, size, etc. of the throttle orifices of the main valve spool and the spring characteristics of the main valve spool spring.

[0015] As a further improvement of the above solution, there is a gap between the lower part at the left end inside the proportional solenoid valve sleeve and the lower part outside the main valve housing to form a passage for the flow of internal oil.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. The utility model provides a safety protection structure after proportion adjustment failure in a proportional solenoid valve, which mainly consists of a fail-safe protection valve seat, a fail-safe protection pressure regulating spring, a fail-safe spring piece and a pilot valve spring fixing seat, and can provide the required suspension damping force requirement even after the valve fails.

[0018] 2. The proportional solenoid valve of the suspension shock absorber can achieve different damping effects by changing the relevant dimensions of limited parts and the magnitude of the driving current according to the damping requirements of the project shock absorber. Changing the initial throttle hole structure or throttle area of the parts can not only provide the damping effect in the fail-safe mode, but also give the proportional excitation current in the proportional adjustment damping mode. By changing the internal throttle structure of the proportional solenoid valve, stepless damping adjustment can be achieved to meet different suspension stiffness adjustments.

[0019] 3. In order to simplify the mass production and assembly in the later stage, the whole proportional solenoid valve is modularly designed. The main valve seat and the main valve housing are assembled into a whole by interference fit, and then the main valve body module and the solenoid valve sleeve are assembled into a whole by interference press-fitting. The same is true for other modules such as the pilot valve module, and its design greatly optimizes the assembly process and efficiency. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the proportional solenoid valve for the automotive suspension damping shock absorber provided by the utility model;

[0021] Figure 2 is Figure 1 a schematic diagram of the structure of the main valve housing, the pilot valve spool and the main valve spool in

[0022] Figure 3 a schematic diagram of the fail-safe working mode of the proportional solenoid valve;

[0023] Figure 4 is a schematic diagram of the proportional adjustment damping working mode of the proportional solenoid valve.

[0024] Main Symbol Explanation:

[0025] 1. Main valve seat; 2. Main valve housing; 3. Fail-safe protection valve seat; 4. Proportional solenoid valve sleeve; 5. Pilot valve spool; 6. Pilot valve sliding bearing; 7. Coil assembly; 8. Pilot valve spool shaft; 9. Pilot valve spring; 10. Pilot valve spring fixing seat; 11. Fail-safe protection pressure regulating spring; 12. Fail-safe spring piece; 13. Pilot valve piece; 14. Pilot valve piece fixing ring; 15. Main valve spool; 16. Main valve spool spring; 17. Throttle port. Detailed Embodiment

[0026] Next, in combination with the accompanying drawings and specific embodiments, the present utility model will be further described. It should be noted that, on the premise of no conflict, any combination can be formed among the following-described embodiments or technical features to form a new embodiment.

[0027] Embodiment:

[0028] Please refer to Figures 1-4 , the proportional solenoid valve for an automotive suspension damping shock absorber in this embodiment includes a coil assembly 7. A proportional solenoid valve sleeve 4 is installed on the coil assembly 7. Inside the proportional solenoid valve sleeve 4, a main valve housing 2, a pilot valve spring fixing seat 10, and a pilot valve spool 5 are sequentially installed from right to left;

[0029] A main valve spool 15 is installed inside the main valve housing 2. A main valve spool spring 16 is arranged between the left end of the main valve spool 15 and the inner wall of the left end of the main valve housing 2, and a main valve seat 1 is installed at the right end of the main valve housing 2;

[0030] A fail-safe protection valve seat 3 is also press-fitted between the left end of the main valve housing 2 and the table surface of the proportional solenoid valve sleeve 4. A fail-safe spring piece 12 is arranged to move left and right at the left end of the fail-safe protection valve seat 3. A fail-safe protection pressure regulating spring 11 is arranged between the fail-safe spring piece 12 and the pilot valve spring fixing seat 10;

[0031] The pilot valve spool 5 slides left and right inside the proportional solenoid valve sleeve 4. A pilot valve spool shaft 8 is fixed in the middle of the pilot valve spool 5. The pilot valve spool shaft 8 slides left and right through the pilot valve spring fixing seat 10 and the fail-safe protection valve seat 3 and extends into the left end of the main valve housing 2. A pilot valve spring 9 is also sleeved on the pilot valve spool shaft 8. The left and right ends of the pilot valve spring 9 are respectively abutted against the pilot valve spool 5 and the pilot valve spring fixing seat 10.

[0032] Pilot valve sliding bearings 6 are press-fitted at the left end inside the proportional solenoid valve sleeve 4, and pilot valve sliding bearings 6 are press-fitted at the right end of the pilot valve spring fixing seat 10. The pilot valve spool shaft 8 slides on the two pilot valve sliding bearings 6. A total of 2 pilot valve sliding bearings 6 are required in this proportional solenoid valve. These two pilot valve sliding bearings 6 are fixed in the proportional solenoid valve sleeve 4 and the pilot valve spool 5 by interference press-fitting, playing a supporting role for the pilot valve sliding bearings 6 at both ends.

[0033] The pilot valve spool shaft 8 and the pilot valve spool 5 are connected together by extrusion riveting and are coaxially designed.

[0034] The pilot valve spool shaft 8 is provided with a pilot valve disc 13 and a pilot valve disc fixing ring 14 at the right end part of the fail-safe valve seat 3. The pilot valve disc 13 is restricted on the pilot valve spool shaft 8 by the pilot valve fixing ring. Due to the spring force of the pilot valve spring 9, the pilot valve disc 13 fits on the right side surface of the fail-safe valve seat 3 to form a sealing effect.

[0035] A round hole is provided in the middle of the fail-safe valve seat 3. The pilot valve spool shaft 8 is placed at the right end of the fail-safe valve seat 3 through the round hole, and the size of the pilot valve disc 13 is larger than the size of the round hole, which can block it and is also convenient for the flow of oil.

[0036] The axis of the inner circle of the fail-safe spring piece 12 is collinear with the axis of the round hole, which is used for the flow of oil when adjusting the damping working mode proportionally.

[0037] A throttle port 17 is also provided above the fail-safe valve seat 3. The throttle port 17 contacts the left side surface of the fail-safe spring piece 12, and the fail-safe spring piece 12 can block it to form a sealing structure.

[0038] An oil inlet is provided at the right end of the main valve seat 1, and throttle ports 17 are provided on both the main valve housing 2 and the main valve spool 15. The damping force can be changed by respectively changing the size or quantity of the throttle holes in the main valve housing 22 and adjusting the pre-tightening force and stiffness of different fail-safe pressure protection springs 11, or the required throttling characteristics can be achieved by appropriate combination. The characteristics required for low-speed damping can be met by changing the type, number, size, etc. of the throttle ports 17 of the main valve spool 15 and the spring characteristics of the main valve spool spring 16.

[0039] There is a gap between the lower left end inside the proportional solenoid valve sleeve 4 and the lower outside of the main valve housing 2 to form a passage for the flow of internal oil.

[0040] The implementation principle of the proportional solenoid valve for the automotive suspension damper in the embodiment of the present application is as follows: The working state of this proportional solenoid valve can be mainly divided into two parts:

[0041] 1. Fail-safe mode

[0042] When the proportional solenoid valve is in the fail-safe mode, after the suspension shock absorber oil flows into the main valve seat 1 from the shock absorber oil inlet, a part of the oil flows out from the side of the main valve spool 15 and enters another cavity of the shock absorber, as follows Figure 3 oil circuit Pout1, and another part of the shock absorber fluid flows through the throttle hole of the main valve spool 15 and then into the throttle hole of the main valve housing;

[0043] Due to the spring force of the fail-safe protection pressure regulating spring 11 in the fail-safe protection structure, a low flow rate cannot generate enough force to open the fail-safe spring piece 12. At this time, all the damping fluid will flow out through the side of the main valve spool 15. At this time, the damping characteristics of low flow rate can be provided, and its characteristics are mainly determined by the main valve spring;

[0044] As the flow rate increases or the shock absorber is rapidly compressed, the flow rate of the damping fluid increases. When the flow rate of the damping fluid increases to a level sufficient to overcome the spring force of the fail-safe protection pressure regulating spring 11, after the damping fluid passes through the throttle orifice 17 of the fail-safe protection valve seat 3, it pushes open the fail-safe spring piece 12, and then flows out through the channel between the main valve housing 2 and the valve sleeve, as follows Figure 3 Oil circuit Pout2. At this time, the channel mainly provides the damping characteristics of high flow rate or high speed of the shock absorption system.

[0045] From the above principle analysis of the fail-safe mode, it can be known that the throttling characteristics of oil circuits Pout1 and Pout2 depend on the differences in various parts or installation parameters in the valve body. Specifically as follows:

[0046] Low-speed damping oil circuit Pout1: The throttling characteristics depend on the size of the throttle orifice between the main valve seat 1 and the main valve spool 15, and the spring force and stiffness of the main valve spool spring 16. Based on different requirements, the throttling characteristics of low speed damping can be achieved by changing the type, number, size, etc. of the throttle orifice of the main valve spool 15 and the spring characteristics of the main valve spool spring 16.

[0047] High-speed damping oil circuit Pout2: The throttling characteristics of this oil circuit mainly depend on the size and quantity of the throttle orifices of the main valve housing 2 and the spring characteristics of the fail-safe pressure protection spring 11. In application, by changing the size or quantity of the throttle orifices of the main valve housing 2 respectively and adjusting the pre-tightening force and stiffness of different fail-safe pressure protection springs 11, the damping force can be changed, or the required throttling characteristics can be achieved by appropriate combination.

[0048] 2. Proportional adjustment damping working mode

[0049] In the proportional solenoid valve under the proportional adjustment damping mode, the damping fluid of the shock absorber mainly flows out from 2 oil circuits inside the proportional solenoid valve. Since the throttle orifices inside the valve change under different currents, the damping requirements of the shock absorber under different currents can be achieved.

[0050] Among them, the oil circuit Pout1 is the same as that in the fail-safe mode, while the oil circuit Pout2 flows through the throttle hole of the main valve spool 15 and then into the throttle hole of the main valve housing 2. Since the proportional solenoid valve coil assembly 7 is powered on at this time, an electromagnetic force is generated to drive the pilot valve spool shaft 8 to drive the pilot valve plate 13 fixed on the spool to move to the right. At this time, the sealing surface between the pilot valve plate 13 and the fail-safe valve seat 3 is opened, and the oil can flow out through the throttle port 17. Then the damping fluid flows into the fail-safe structure area through the opened channel, and after flowing out from the side of the fail-safe valve seat 3, it finally flows out from the side flow hole between the main valve housing 2 and the solenoid valve sleeve into the proportional solenoid valve and then into another cavity of the shock absorber, as follows Figure 4 ;

[0051] Among them, under the drive of the electromagnetic force of different currents of the proportional solenoid valve pilot spool, the pilot valve spool shaft 8 drives the pilot valve plate 13 to move towards the main valve housing 2. During this process, different throttle holes and throttle areas are respectively formed between the main valve housing 2 and the pilot valve plate 13, and between the pilot valve plate 13 and the fail-safe valve seat 3. The principle that the proportional solenoid valve can provide variable damping in this mode is to give different magnitudes of current to control the pilot valve plate 13 at different positions, thereby realizing different throttle structures and throttle areas and forming different damping effects.

[0052] By setting a safety protection structure after proportional adjustment in the proportional solenoid valve, which is mainly composed of a fail-safe valve seat 3, a fail-safe pressure regulating spring 11, a fail-safe spring piece 12, and a pilot valve spring fixing seat 10, the required suspension damping force can still be provided after the valve fails.

[0053] The proportional solenoid valve of this suspension shock absorber can achieve different damping effects according to the damping requirements of the project shock absorber by changing the relevant dimensions of limited parts and the magnitude of the driving current. Changing the initial throttle hole structure or throttle area of the parts can not only provide the damping effect in the fail-safe mode, but also, in the proportional damping adjustment mode, an excitation current in proportion can be given to change the internal throttle structure of the proportional solenoid valve, so as to achieve stepless damping adjustment and meet different suspension stiffness adjustments.

[0054] In order to achieve simple mass production and assembly in the later stage, the entire proportional solenoid valve is designed modularly. The main valve seat and the main valve housing 2 are assembled into a whole through interference fit, and then the main valve body module and the solenoid valve sleeve are assembled into a whole through interference press-fitting. The same is true for other modules such as the pilot valve module, and its design greatly optimizes the assembly process and efficiency.

[0055] The above embodiments are only the preferred embodiments of the present utility model, and the scope of protection of the present utility model cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art based on the present utility model fall within the scope of protection required by the present utility model.

Claims

1. Proportional solenoid valve for automotive suspension damping shock absorber, including a coil assembly (7), characterized in that, A proportional solenoid valve sleeve (4) is installed on the coil assembly (7). Inside the proportional solenoid valve sleeve (4), a main valve housing (2), a pilot valve spring fixing seat (10), and a pilot valve spool (5) are installed in sequence from right to left; A main valve spool (15) is installed inside the main valve housing (2). A main valve spool spring (16) is arranged between the left end of the main valve spool (15) and the inner wall of the left end of the main valve housing (2). And a main valve seat (1) is installed at the right end of the main valve housing (2); A fail-safe protection valve seat (3) is also press-fitted between the left end of the main valve housing (2) and the table surface of the proportional solenoid valve sleeve (4). A fail-safe spring piece (12) is arranged to move left and right at the left end of the fail-safe protection valve seat (3). A fail-safe protection pressure regulating spring (11) is arranged between the fail-safe spring piece (12) and the pilot valve spring fixing seat (10); The pilot valve spool (5) slides left and right inside the proportional solenoid valve sleeve (4). A pilot valve spool shaft (8) is fixed in the middle of the pilot valve spool (5). The pilot valve spool shaft (8) slides left and right through the pilot valve spring fixing seat (10) and the fail-safe protection valve seat (3) and extends into the left end of the main valve housing (2). A pilot valve spring (9) is also sleeved on the pilot valve spool shaft (8). The left and right ends of the pilot valve spring (9) are respectively abutted against the pilot valve spool (5) and the pilot valve spring fixing seat (10).

2. The proportional solenoid valve for an automotive suspension damping shock absorber according to claim 1, wherein A pilot valve sliding bearing (6) is press-fitted at the left end inside the proportional solenoid valve sleeve (4). A pilot valve sliding bearing (6) is press-fitted at the right end of the pilot valve spring fixing seat (10). The pilot valve spool shaft (8) slides on the two pilot valve sliding bearings (6).

3. The proportional solenoid valve for an automotive suspension damping shock absorber according to claim 1, wherein The pilot valve spool shaft (8) and the pilot valve spool (5) are connected together by extrusion riveting and are coaxially designed.

4. The proportional solenoid valve for an automotive suspension damping shock absorber according to claim 1, wherein, A pilot valve piece (13) and a pilot valve piece fixing ring (14) are arranged on the part of the pilot valve spool shaft (8) placed at the right end of the fail-safe protection valve seat (3).

5. The proportional solenoid valve for an automotive suspension damper according to claim 4, characterized in that, A round hole is arranged in the middle of the fail-safe protection valve seat (3). The pilot valve spool shaft (8) is placed at the right end of the fail-safe protection valve seat (3) through the round hole. And the size of the pilot valve piece (13) is larger than the size of the round hole; The axis of the inner circle of the fail-safe spring piece (12) is collinear with the axis of the round hole.

6. The proportional solenoid valve for an automotive suspension damper according to claim 1, characterized in that, A throttle port (17) is also arranged above the fail-safe protection valve seat (3). The throttle port (17) is in contact with the left side surface of the fail-safe spring piece (12).

7. The proportional solenoid valve for an automotive suspension damping shock absorber according to claim 1, wherein, An oil inlet is arranged at the right end of the main valve seat (1). And throttle ports (17) are arranged on both the main valve housing (2) and the main valve spool (15).

8. The proportional solenoid valve for an automotive suspension damper according to claim 1, wherein A gap is formed between the lower part of the left end inside the proportional solenoid valve sleeve (4) and the lower part outside the main valve housing (2) to form a passage.

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