A semi-active shock absorber with adjustable damping for high-frequency response

Abstract

The present invention relates to a high-frequency response semi-active shock absorber with adjustable damping, which includes an oil storage cylinder, a working cylinder, a piston rod and a bypass oil passage. A conducting one-way valve is arranged between the working cylinder and the oil storage cylinder, and both ends of the conducting one-way valve are respectively communicated with the lower end of the working cylinder and the inside of the oil storage cylinder. The piston body is provided with a conducting hole and a piston one-way valve for communicating the upper chamber and the lower chamber. The bypass oil passage includes a first branch oil passage, a second branch oil passage and a third branch oil passage which are arranged in parallel. A first switching valve and a first pilot valve are connected in series on the first branch oil passage. A second switching valve is arranged on the second branch oil passage. A first overflow valve is arranged on the third branch oil passage. The purpose of the present invention is to solve or at least alleviate the problem that the traditional passive hydraulic shock absorber cannot be adjusted in real time according to the vehicle load and line conditions, and to provide a high-frequency response semi-active shock absorber with adjustable damping.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorbers, and particularly to a high-frequency response damping adjustable semi-active shock absorber. Background Art

[0002] With the rapid development of the scale and mileage of China's railways, high-speed rail vehicles have higher and higher requirements for riding comfort and driving stability. At present, traditional passive oil pressure shock absorbers are used for rail vehicle shock absorbers. The damping characteristics of the shock absorber are fixed damping coefficients or damping curves set at the factory, and cannot be adjusted in real time according to the vehicle load and line conditions. When the line conditions, vehicle speed, and load change, the damping coefficient required by the track bogie system for the shock absorber will change continuously. The set damping curve of the traditional passive shock absorber can only take the compromise value of multiple working conditions, and there will be a problem that the set damping coefficient cannot meet the required damping coefficient under actual working conditions during actual operation, resulting in a decrease in vehicle comfort and stability. Therefore, the use of a semi-active shock absorber that can adjust the damping force in real time at high frequency has become an inevitable trend for high-speed rail vehicles. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, solve or at least mitigate the problem that traditional passive oil pressure shock absorbers cannot be adjusted in real time according to the vehicle load and line conditions, and provide a high-frequency response damping adjustable semi-active shock absorber.

[0004] The present invention is realized through the following technical solutions:

[0005] A high-frequency response damping adjustable semi-active shock absorber includes an oil storage cylinder, a working cylinder, a piston rod, and a bypass oil circuit. The working cylinder is hermetically and fixedly sleeved inside the oil storage cylinder. The lower end of the piston rod is located inside the working cylinder and is fixedly provided with a piston body. The piston body is hermetically and longitudinally slidably sleeved inside the working cylinder. The piston body divides the working cylinder into an upper chamber and a lower chamber. One end of the bypass oil circuit is connected to the lower part of the oil storage cylinder, and the other end is connected to the upper part of the working cylinder and is located above the piston body. The flow direction of the bypass oil circuit is from the working cylinder to the oil storage cylinder. A conducting check valve is provided between the working cylinder and the oil storage cylinder. Both ends of the conducting check valve are respectively connected to the lower end of the working cylinder and the inside of the oil storage cylinder. The conducting direction of the conducting check valve is from the oil storage cylinder to the working cylinder;

[0006] The piston body is provided with a guiding through hole and a piston check valve for communicating the upper chamber and the lower chamber. The conducting direction of the piston check valve is from the lower chamber to the upper chamber;

[0007] The bypass oil circuit includes a first branch oil circuit, a second branch oil circuit, and a third branch oil circuit arranged in parallel. A first switching valve and a first pilot valve are sequentially connected in series on the first branch oil circuit according to the flow direction. A second switching valve is provided on the second branch oil circuit. A first overflow valve is provided on the third branch oil circuit.

[0008] To further implement the present invention, the following technical solutions can be preferably selected:

[0009] Preferably, a piston throttle valve is provided in the pilot hole of the piston body.

[0010] Preferably, a first throttle valve is further provided on the third branch oil path, and the first throttle valve is located behind the first relief valve.

[0011] Preferably, when the high-frequency response damping adjustable semi-active shock absorber works, it includes a stretching stage and a compression stage. When in the stretching stage, when the piston rod drives the piston body to move upward, and when in the compression stage, the piston rod drives the piston body to move downward.

[0012] Preferably, when the high-frequency response damping adjustable semi-active shock absorber is in the stretching stage, the energizing current of the first pilot valve is 0.3A - 1.6A;

[0013] When the high-frequency response damping adjustable semi-active shock absorber is in the compression stage, the energizing current of the first pilot valve is not greater than 2A.

[0014] By the above technical solutions, the beneficial effects of the present invention are as follows:

[0015] The present invention is a semi-active high-frequency response shock absorber with a single oil circulation and a bypass control oil path. Through the high-frequency action control of the first switching valve, the second switching valve and the first pilot valve in the bypass oil path, the throttle area of the shock absorber oil is adjusted in real time, realizing that the damping force of the shock absorber can be adjusted quickly at high frequency in three modes, namely: the extreme fast response mode, the continuously adjustable mode, and the passive mode. The first switching valve, the second switching valve and the first pilot valve adopted can achieve a fast response with a damping force ≤ 50ms; the redundant backup design of the control oil path throttling system can ensure that the shock absorber can travel normally in the passive mode with a suitable fixed damping curve when the electrical control fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the hydraulic schematic diagram of the present invention;

[0017] Figure 2 is the hydraulic schematic diagram of the minimum damping when the present invention is in the compression state;

[0018] Figure 3 is the hydraulic schematic diagram of adjustable damping when the present invention is in the compression state;

[0019] Figure 4 is the hydraulic schematic diagram of the maximum damping when the present invention is in the compression state;

[0020] Figure 5 is the hydraulic schematic diagram of the intermediate damping when the present invention is in the compression state;

[0021] Figure 6 This is the hydraulic schematic diagram of the minimum damping when the present invention is in the stretched state;

[0022] Figure 7 This is the hydraulic schematic diagram of adjustable damping when the present invention is in the stretched state;

[0023] Figure 8 This is the hydraulic schematic diagram of the maximum damping when the present invention is in the stretched state;

[0024] Figure 9 This is the hydraulic schematic diagram of the intermediate damping when the present invention is in the stretched state;

[0025] Wherein: 1 - oil storage cylinder; 2 - working cylinder; 3 - piston rod; 4 - bypass oil circuit; 5 - piston body; 6 - upper chamber; 7 - lower chamber; 8 - conducting check valve; 9 - piston check valve; 10 - piston throttle valve; 11 - first switching valve; 12 - first pilot valve; 13 - second switching valve; 14 - first relief valve; 15 - first throttle valve; 401 - first branch oil circuit; 402 - second branch oil circuit; 403 - third branch oil circuit. Detailed implementation manners

[0026] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] Embodiment 1:

[0029] Such as Figures 1-9As shown in the figure, a high-frequency response semi-active shock absorber with adjustable damping includes an oil storage cylinder 1, a working cylinder 2, a piston rod 3, and a bypass oil passage 4. The working cylinder 2 is hermetically and fixedly sleeved inside the oil storage cylinder 1. The lower end of the piston rod 3 is located inside the working cylinder 2 and is fixedly provided with a piston body 5. The piston body 5 is hermetically and longitudinally slidably sleeved inside the working cylinder 2. The piston body 5 divides the working cylinder 2 into an upper chamber 6 and a lower chamber 7. One end of the bypass oil passage 4 is connected to the lower part of the oil storage cylinder 1, and the other end is connected to the upper part of the working cylinder 2 and is located above the piston body 5. The flow direction of the bypass oil passage 4 is from the working cylinder 2 to the oil storage cylinder 1. A conducting check valve 8 is arranged between the working cylinder 2 and the oil storage cylinder 1. Both ends of the conducting check valve 8 are respectively connected to the lower end of the working cylinder 2 and the inside of the oil storage cylinder 1. The conducting direction of the conducting check valve 8 is from the oil storage cylinder 1 to the working cylinder 2;

[0030] The piston body 5 is provided with a through hole for communicating the upper chamber 6 and the lower chamber 7 and a piston check valve 9. The conducting direction of the piston check valve 9 is from the lower chamber 7 to the upper chamber 6. The through hole of the piston body 5 is provided with a piston throttle valve 10;

[0031] The bypass oil passage 4 includes a first branch oil passage 401, a second branch oil passage 402, and a third branch oil passage 403 arranged in parallel. A first switching valve 11 and a first pilot valve 12 are successively connected in series on the first branch oil passage 401 according to the flow direction. A second switching valve 13 is arranged on the second branch oil passage 402. A first overflow valve 14 and a first throttle valve 15 are successively connected in series on the third branch oil passage 403 according to the flow direction.

[0032] The operation of the present invention can be divided into two motion processes: compression and stretching. The realization methods of adjusting the damping force of the shock absorber in the two processes are as follows:

[0033] Stretching stage: The piston body 5 moves upward, the piston one-way valve 9 closes, the space of the upper chamber 6 of the working cylinder 2 shrinks, and the hydraulic oil flows into the oil storage cylinder 1 through the bypass oil circuit 4. At the same time, the space of the lower chamber 7 of the working cylinder 2 expands to generate negative pressure, the conducting one-way valve 8 of the oil storage cylinder 1 opens, and the hydraulic oil flowing back to the oil storage cylinder 1 flows into the lower chamber 7 of the working cylinder 2 through the conducting one-way valve 8 to compensate for the expanded space of the lower chamber 7. When the first switching valve 11 is opened, the second switching valve 13 is opened, and the first pilot valve 12 is de-energized, the hydraulic oil flows back to the oil storage cylinder 1 in parallel through the first branch oil circuit 401 and the second branch oil circuit 402, the throttling area of the oil circuit is the largest, and the shock absorber is in the minimum damping state; when the first switching valve 11 is closed and the second switching valve 13 is closed, the hydraulic oil in the upper chamber 6 of the working cylinder 2 can only flow into the lower chamber 7 of the piston through the piston throttle valve 10. At the same time, since the piston rod 3 occupies part of the volume in the upper chamber 6, the volume of the hydraulic oil flowing from the upper chamber 6 into the lower chamber 7 is smaller than the expanded volume of the lower chamber 7, the conducting one-way valve 8 of the oil storage cylinder 1 opens, and the hydraulic oil in the oil storage cylinder 1 flows into the lower chamber 7 to compensate for the equivalent volume of the piston rod 3. In this state, the throttling area of the oil circuit is only the piston throttle valve 10, and the shock absorber is in the maximum damping force state; when the first switching valve 11 is opened, the second switching valve 13 is closed, and the first pilot valve 12 is energized (current 0.3A - 1.6A), the hydraulic oil in the upper chamber 6 of the piston flows from the first branch oil circuit 401, through the first switching valve 11 and the first pilot valve 12 into the oil storage chamber, and the throttling area of the oil circuit is controlled by the opening of the first pilot valve 12. At this time, the shock absorber is in the state of adjustable damping; when the first switching valve 11 is opened, the second switching valve 13 is closed, and the pilot valve is de-energized, the hydraulic oil in the upper chamber 6 flows into the oil storage cylinder 1 through the first branch oil circuit 401. At this time, the throttling area of the oil circuit is the maximum throttling area of the first pilot valve 12 itself, the damping force is not adjustable, and it is at the intermediate value. At this time, the shock absorber is in the intermediate damping passive mode.

[0034] Compression stage: The piston body 5 moves downward, the piston check valve 9 opens, and the oil in the lower chamber 7 flows into the upper chamber 6 through the piston check valve 9. Since a part of the volume of the upper chamber 6 is occupied by the piston rod 3, the volume of the oil flowing from the lower chamber 7 into the upper chamber 6 is greater than the expanded volume of the upper chamber 6. The oil equivalent to the cross-sectional volume of the piston rod 3 will flow back to the storage oil cylinder 1 through the bypass oil circuit 4. When the first switch valve 11 is opened, the second switch valve 13 is opened, and the first pilot valve 12 is de-energized, the oil flows directly back to the storage oil cylinder 1 in parallel through the first branch oil circuit 401 and the second branch oil circuit 402. The throttling area of the oil circuit is the largest, and the shock absorber is in the minimum damping state; when the first switch valve 11 is closed and the second switch valve 13 is closed, the excess oil flowing into the upper chamber 6 can only flow into the third branch oil circuit 403. When the oil pressure is greater than the spring pre-tightening force of the first overflow valve 14, the oil flows back to the storage oil cylinder 1 through the first overflow valve 14 and the first throttle valve 15. At this time, the throttling area is only the throttling area of the first throttle valve 15, and the throttling area is the smallest, which is the maximum damping state; when the first switch valve 11 is opened, the second switch valve 13 is closed, and the first pilot valve 12 is energized (current ≤ 2A), the excess oil flowing into the upper chamber 6 flows back to the storage oil cylinder 1 from the first branch oil circuit 401 through the first switch valve 11 and the first pilot valve 12. The throttling area of the oil circuit is controlled by the opening of the first pilot valve 12. At this time, the shock absorber is in the state of continuously adjustable damping; when the first switch valve 11 is open, the second switch valve 13 is closed, and the first pilot valve 12 is de-energized, the oil in the upper chamber 6 flows directly into the storage oil cylinder 1 through the first branch oil circuit 401. At this time, the throttling area of the oil circuit is the maximum throttling area of the first pilot valve 12 itself, and the damping force is not adjustable, which is the intermediate value. At this time, the shock absorber is in the intermediate damping passive mode.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A semi-active shock absorber with adjustable damping for high-frequency response, comprising an oil storage cylinder (1), a working cylinder (2), a piston rod (3) and a bypass oil passage (4). The working cylinder (2) is hermetically and fixedly sleeved inside the oil storage cylinder (1). The lower end of the piston rod (3) is located inside the working cylinder (2) and is fixedly provided with a piston body (5). The piston body (5) is hermetically and longitudinally slidably sleeved inside the working cylinder (2). The piston body (5) divides the working cylinder (2) into an upper chamber (6) and a lower chamber (7). One end of the bypass oil passage (4) is communicated to the lower part of the oil storage cylinder (1), and the other end is communicated to the upper part of the working cylinder (2) and is located above the piston body (5). The flow direction of the bypass oil passage (4) is from the working cylinder (2) to the oil storage cylinder (1). Characterized in that, A conducting check valve (8) is arranged between the working cylinder (2) and the oil storage cylinder (1). Both ends of the conducting check valve (8) are respectively communicated to the lower end of the working cylinder (2) and the inside of the oil storage cylinder (1). The conducting direction of the conducting check valve (8) is from the oil storage cylinder (1) to the working cylinder (2). The piston body (5) is provided with a through hole for communicating the upper chamber (6) and the lower chamber (7) and a piston check valve (9). The conducting direction of the piston check valve (9) is from the lower chamber (7) to the upper chamber (6). A piston throttle valve (10) is arranged in the through hole of the piston body (5). The bypass oil passage (4) comprises a first branch oil passage (401), a second branch oil passage (402) and a third branch oil passage (403) arranged in parallel. A first switching valve (11) and a first pilot valve (12) are successively connected in series on the first branch oil passage (401) according to the flow direction. A second switching valve (13) is arranged on the second branch oil passage (402). A first overflow valve (14) is arranged on the third branch oil passage (403). A first throttle valve (15) is also arranged on the third branch oil passage (403). The first throttle valve (15) is located behind the first overflow valve (14).

2. A semi-active shock absorber with adjustable damping for high-frequency response according to claim 1, Characterized in that, When the semi-active shock absorber with adjustable damping for high-frequency response works, it includes a stretching stage and a compression stage. When in the stretching stage, when the piston rod (3) drives the piston body (5) to move upward, when in the compression stage, the piston rod (3) drives the piston body (5) to move downward.

3. A semi-active shock absorber with adjustable damping for high-frequency response according to claim 2, Characterized in that, When the semi-active shock absorber with adjustable damping for high-frequency response is in the stretching stage, the energizing current of the first pilot valve (12) is 0.3A - 1.6A; When the semi-active shock absorber with adjustable damping for high-frequency response is in the compression stage, the energizing current of the first pilot valve (12) is not greater than 2A.

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