Active suspension actuator and vehicle suspension system

Abstract

The utility model relates to an active suspension actuator and a vehicle suspension system, the active suspension actuator comprises an actuator main body and a circulating oil path, the actuator main body comprises a cylinder body, a piston and a piston rod, the piston is located in the cylinder body, the piston and the inner surface of the cylinder body are in sealing contact and can move relatively, and the cylinder body is divided into a first cavity and a second cavity by the piston; the piston rod is connected with the piston and penetrates through the second cavity to extend out of the cylinder body, one end of the circulating oil way is connected with the first cavity, the other end of the circulating oil way is connected with the second cavity, the circulating oil way comprises a damping branch and a power branch, and the damping branch provides damping force for hydraulic oil flowing into the second cavity from the first cavity and hydraulic oil flowing into the first cavity from the second cavity. The power branch and the damping branch are connected in parallel, and the power branch provides power for hydraulic oil flowing into the second cavity from the first cavity and hydraulic oil flowing into the first cavity from the second cavity. According to the active suspension actuator and the vehicle suspension system, power can be actively provided, and comfort and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle suspension, and more specifically, to an active suspension actuator and a vehicle suspension system. Background Art

[0002] In the vehicle suspension system, some use passive shock absorbers, and some use variable damping shock absorbers with solenoid valves. When passive shock absorbers are used, the suspension system is a passive suspension system, which cannot take into account both comfort and stability, and can only adopt a compromise solution during design. When shock absorbers with solenoid valves are used, the suspension system is a semi-active suspension system, which only changes the damping ratio of the suspension system under different working conditions. Although it can improve comfort and stability to a certain extent, it cannot actively apply force to the vehicle body, and it is impossible to obtain ideal suspension performance under various working conditions. Utility Model Content

[0003] The utility model aims to provide an active suspension actuator and a vehicle suspension system, which can actively provide power and improve comfort and stability.

[0004] The utility model provides an active suspension actuator, the active suspension actuator comprises an actuator body and a circulating oil circuit, the actuator body comprises:

[0005] Cylinder body;

[0006] A piston, the piston is located inside the cylinder, the piston is in sealing contact with the inner surface of the cylinder and can move relatively, and the piston divides the cylinder into a first chamber and a second chamber; and

[0007] a piston rod, the piston rod being connected to the piston and extending through the second chamber out of the cylinder body;

[0008] One end of the circulating oil circuit is connected to the first chamber, and the other end is connected to the second chamber. The circulating oil circuit includes:

[0009] a damping branch configured to provide a damping force to the hydraulic oil flowing from the first chamber into the second chamber and to the hydraulic oil flowing from the second chamber into the first chamber; and

[0010] A power branch is connected in parallel with the damping branch and is configured to provide power to the hydraulic oil flowing from the first chamber into the second chamber and to the hydraulic oil flowing from the second chamber into the first chamber.

[0011] In an embodiment of the utility model, the damping branch includes a first damping valve and a second damping valve, the first damping valve is close to the first chamber, the second damping valve is close to the second chamber, the first damping valve and the second damping valve are both one-way damping valves, and the first damping valve and the second damping valve are set in opposite directions.

[0012] In an embodiment of the present utility model, the damping branch further includes an accumulator, and the accumulator is located between the first damping valve and the second damping valve.

[0013] In an embodiment of the utility model, the first damping valve and the second damping valve are electrically controlled adjustable damping valves.

[0014] In an embodiment of the utility model, the power branch includes a bidirectional oil pump.

[0015] In an embodiment of the utility model, the power branch further comprises a switch valve, and the switch valve is connected in series with the bidirectional oil pump.

[0016] In the embodiment of the utility model, the switch valve is in a normally closed state.

[0017] An embodiment of the utility model further provides a vehicle suspension system, wherein the vehicle suspension system comprises the above-mentioned active suspension actuator.

[0018] In the active suspension actuator and vehicle suspension system of the utility model, when the actuator body is compressed, the damping branch can provide a damping force to the hydraulic oil flowing from the first chamber into the second chamber. When the actuator body is stretched, the damping branch can provide a damping force to the hydraulic oil flowing from the second chamber into the first chamber. The vibration between the vehicle body and the suspension swing arm can be reduced. If necessary, the power branch can also actively provide power to reduce the stretching or compression of the actuator body to reduce the roll angle of the vehicle when turning and the pitch angle during braking / acceleration, or to offset the vibration of the vehicle body caused by uneven road surface, thereby obtaining good comfort and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the active suspension actuator in the embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of a passive compression working condition of an active suspension actuator in an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the passive stretching working condition of the active suspension actuator in the embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of an active compression working condition of an active suspension actuator in an embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the active stretching working condition of the active suspension actuator in the embodiment of the utility model;

[0024] Figure 6 A schematic diagram of an active anti-roll / pitch working condition of an active suspension actuator in an embodiment of the utility model;

[0025] Figure 7 It is a schematic diagram of the active anti-roll / pitch working condition of the active suspension actuator in the embodiment of the utility model. DETAILED DESCRIPTION

[0026] The following will describe the specific implementation of the utility model in conjunction with the accompanying drawings. The following detailed description and drawings are used to exemplarily illustrate the principle of the utility model. The utility model is not limited to the preferred embodiments described, and the protection scope of the utility model is defined by the claims.

[0027] like Figure 1 As shown, the embodiment of the utility model provides an active suspension actuator, which includes an actuator body and a circulating oil circuit. The actuator body includes a cylinder 1, a piston 2 and a piston rod 3. The circulating oil circuit includes a damping branch 91 and a power branch 92.

[0028] The piston 2 is located inside the cylinder 1, and the piston 2 is in sealing contact with the inner surface of the cylinder 1 and can move relative to each other. The piston 2 divides the cylinder 1 into a first chamber 11 and a second chamber 12. And as the piston 2 moves, the volumes of the first chamber 11 and the second chamber 12 change.

[0029] The piston rod 3 is connected to the piston 2 and extends out of the cylinder body 1 through the second chamber 12. In this way, the cylinder body 1 and the piston rod 3 extending out of the cylinder body 1 can be connected to the vehicle body and the suspension swing arm respectively. For example, the cylinder body 1 is connected to the vehicle body, and the piston rod 3 is connected to the suspension swing arm. Alternatively, the cylinder body 1 is connected to the suspension swing arm, and the piston rod 3 is connected to the vehicle body.

[0030] Since the piston rod 3 extends out of the cylinder body 1 through the second chamber 12, when the piston 2 moves inside the cylinder body 1, the hydraulic oil squeezed out by the reduced volume of the first chamber 11 cannot be completely accommodated in the second chamber 12 (when the actuator body is compressed), and the hydraulic oil squeezed out by the reduced volume of the second chamber 12 cannot fill the first chamber 11 (when the actuator body is stretched).

[0031] One end of the circulating oil circuit is connected to the first chamber 11, and the other end is connected to the second chamber 12. When the piston 2 moves inside the cylinder body 1, the circulating oil circuit can connect the first chamber 11 and the second chamber 12, allowing the hydraulic oil squeezed out of the first chamber 11 to flow into the second chamber 12, or allowing the hydraulic oil squeezed out of the second chamber 12 to flow into the first chamber 11. Thus, the circulation of the hydraulic oil can be achieved when the actuator body is compressed and stretched.

[0032] The circulating oil circuit includes a damping branch 91 and a power branch 92, which are connected in parallel. The damping branch 91 is configured to provide a damping force to the hydraulic oil flowing from the first chamber 11 into the second chamber 12 and from the second chamber 12 into the first chamber 11. The power branch 92 is configured to provide power to the hydraulic oil flowing from the first chamber 11 into the second chamber 12 and from the second chamber 12 into the first chamber 11.

[0033] When the actuator body is compressed, that is, when the piston 2 squeezes the first chamber 11, the hydraulic oil in the first chamber 11 is squeezed out. At this time, the damping branch 91 can provide a damping force to the hydraulic oil flowing from the first chamber 11 into the second chamber 12. When the actuator body is stretched, that is, when the piston 2 squeezes the second chamber 12, the hydraulic oil in the second chamber 12 is squeezed out. At this time, the damping branch 91 can provide a damping force to the hydraulic oil flowing from the second chamber 12 into the first chamber 11. In this way, the vibration between the vehicle body and the suspension swing arm can be reduced.

[0034] When necessary, the power branch 92 can also actively provide power to reduce the stretching or compression of the actuator body, so as to reduce the roll angle of the vehicle when turning and the pitch angle during braking / acceleration, or offset the body vibration caused by uneven road surface, thereby achieving good comfort and stability.

[0035] In the embodiment of the utility model, the damping branch 91 includes a first damping valve 4 and a second damping valve 5. The first damping valve 4 is close to the first chamber 11, and the second damping valve 5 is close to the second chamber 12. The first damping valve 4 and the second damping valve 5 are both one-way damping valves, and the first damping valve 4 and the second damping valve 5 are arranged in opposite directions.

[0036] When the actuator body is compressed, that is, when the piston 2 squeezes the first chamber 11, the hydraulic oil in the first chamber 11 is squeezed out. At this time, the first damping valve 4 plays a damping role, and the second damping valve 5 does not play a damping role. When the actuator body is stretched, that is, when the piston 2 squeezes the second chamber 12, the hydraulic oil in the second chamber 12 is squeezed out. At this time, the second damping valve 5 plays a damping role, and the first damping valve 4 does not play a damping role.

[0037] The first damping valve 4 and the second damping valve 5 are both provided with a one-way channel and a damping channel inside. When the actuator body is compressed, that is, when the piston 2 squeezes the first chamber 11, the hydraulic oil in the first chamber 11 is squeezed out. At this time, the one-way channel in the first damping valve 4 is closed, and the hydraulic oil can only pass through the damping channel, so the first damping valve 4 plays a damping role. The one-way channel in the second damping valve 5 is connected, so the hydraulic oil can pass through the one-way channel without passing through the damping channel, so the second damping valve 5 does not play a damping role. When the actuator body is stretched, that is, when the piston 2 squeezes the second chamber 12, the hydraulic oil in the second chamber 12 is squeezed out. At this time, the one-way channel in the second damping valve 5 is closed, and the hydraulic oil can only pass through the damping channel, so the second damping valve 5 plays a damping role. The one-way channel in the first damping valve 4 is connected, so the hydraulic oil can pass through the one-way channel, so the first damping valve 4 does not play a damping role.

[0038] In the embodiment of the utility model, the damping branch 91 further includes an accumulator 6, which is located between the first damping valve 4 and the second damping valve 5. The accumulator 6 can store excess hydraulic oil during the hydraulic oil circulation process, and can replenish the hydraulic oil into the circulation process when needed.

[0039] As mentioned above, since the piston rod 3 extends out of the cylinder body 1 through the second chamber 12, when the actuator body is compressed, the volume of the first chamber 11 decreases and the hydraulic oil squeezed out cannot be completely accommodated in the second chamber 12. At this time, the excess hydraulic oil is stored in the accumulator 6. When the actuator body is stretched, the volume of the second chamber 12 decreases and the hydraulic oil squeezed out cannot fill the first chamber 11. At this time, the hydraulic oil in the accumulator 6 is used to replenish it.

[0040] In the embodiment of the utility model, the first damping valve 4 and the second damping valve 5 are electrically controlled adjustable damping valves. The damping force generated by the damping valves can be adjusted as required (for example, according to feedback from a control unit) to produce a harder or softer state.

[0041] In the embodiment of the utility model, the power branch 92 includes a bidirectional oil pump 7. The bidirectional oil pump 7 can provide power to the hydraulic oil flowing from the first chamber 11 to the second chamber 12, or provide power to the hydraulic oil flowing from the second chamber 12 to the first chamber 11 as needed.

[0042] In the embodiment of the utility model, the power branch 92 further includes a switch valve 8, which is connected in series with the bidirectional oil pump 7. The switch valve 8 can control whether to provide power to the circulating oil circuit. When the switch valve 8 is opened, power can be provided to the circulating oil circuit, and when the switch valve 8 is closed, power cannot be provided to the circulating oil circuit.

[0043] In the embodiment of the utility model, the switch valve 8 is in a normally closed state and is opened only when power needs to be provided to the circulating oil circuit.

[0044] like Figure 2 and Figure 3 As shown, this is a passive compression / tension condition, in which the switch valve 8 is closed.

[0045] Figure 2 In the passive compression working condition, the piston rod 3 and the piston 2 move upward, the hydraulic oil in the first chamber 11 is squeezed out, and passes through the first damping valve 4 to generate a compression damping force. The cross-sectional area of ​​the first chamber 11 is larger than that of the second chamber 12. Therefore, part of the hydraulic oil discharged from the first chamber 11 enters the second chamber 12, and the rest enters the accumulator 6.

[0046] Figure 3 In the passive tension condition, the piston rod 3 and the piston 2 move downward, the hydraulic oil in the second chamber 12 is squeezed out, and passes through the second damping valve 5 to generate a tension damping force. The cross-sectional area of ​​the first chamber 11 is larger than that of the second chamber 12, so all the hydraulic oil discharged from the second chamber 12 enters the first chamber 11, and the insufficient part is supplemented by the accumulator 6.

[0047] like Figure 4 and Figure 5 As shown, this is an active compression / tension condition, under which the switch valve 8 is open.

[0048] Figure 4 For active compression working condition, the bidirectional oil pump 7 draws hydraulic oil from the first chamber 11 and pumps it into the second chamber 12, so that the piston rod 3 and the piston 2 move upward; the cross-sectional area of ​​the first chamber 11 is larger than that of the second chamber 12, so a part of the hydraulic oil discharged from the first chamber 11 enters the second chamber 12, and the rest enters the accumulator 6.

[0049] Figure 5 For active stretching conditions, the bidirectional oil pump 7 draws hydraulic oil from the second chamber 12 and the accumulator 6 and pumps it into the first chamber 11, causing the piston rod 3 and the piston 2 to move downward.

[0050] like Figure 6 and Figure 7 As shown, it is an active anti-roll / pitch working condition, under which the switch valve 8 is opened.

[0051] Figure 6 In the roll / pitch working condition, the actuator body is compressed, the hydraulic oil in the first chamber 11 is squeezed out, and at the same time, the two-way oil pump 7 draws hydraulic oil from the second chamber 12 and pumps it to the first chamber 11. After the two hydraulic oils converge, they flow through the first damping valve 4 and enter the second chamber 12, the accumulator 6 and the oil suction port of the two-way oil pump 7. At this time, the first damping valve 4 is set to the hardest state. Therefore, during the continuous pumping of the two-way oil pump 7, the pressure in the first chamber 11 is much greater than that in the second chamber 12, generating a force that resists the upward movement of the piston 2, reducing the compression of the actuator body.

[0052] Figure 7In the roll / pitch working condition, the actuator body is stretched, the hydraulic oil in the second chamber 12 is squeezed out, and at the same time, the two-way oil pump 7 extracts hydraulic oil from the first chamber 11 and the accumulator 6, and pumps it to the second chamber 12. After the two hydraulic oils converge, they flow through the second damping valve 5 and enter the first chamber 11 and the oil suction port of the two-way oil pump 7. At this time, the second damping valve 5 is set to the hardest state. Therefore, in the process of the two-way oil pump 7 continuously pumping oil, the pressure in the second chamber 12 is much greater than that in the first chamber 11, generating a force to resist the downward movement of the piston 2, reducing the stretching of the actuator body.

[0053] When two actuators are provided, the two actuators exert opposite forces on the vehicle body, thereby generating a moment to resist the roll / pitch.

[0054] The embodiment of the utility model further provides a vehicle suspension system, the vehicle suspension system comprising the above-mentioned active suspension actuator. Of course, the vehicle suspension system also comprises a sensor, a control unit, etc., which will not be described in detail here.

[0055] In the vehicle suspension system of the embodiment of the utility model, when the actuator body is compressed, the damping branch 91 can provide a damping force to the hydraulic oil flowing from the first chamber 11 to the second chamber 12. When the actuator body is stretched, the damping branch 91 can provide a damping force to the hydraulic oil flowing from the second chamber 12 to the first chamber 11. The vibration between the vehicle body and the suspension swing arm can be reduced. If necessary, the power branch 92 can also actively provide power to reduce the stretching or compression of the actuator body to reduce the roll angle of the vehicle when turning and the pitch angle during braking / acceleration, or to offset the vibration of the vehicle body caused by uneven road surface, thereby obtaining good comfort and stability.

[0056] As mentioned above, although the exemplary embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above specific embodiments, and the protection scope of the present invention should be defined by the claims and their equivalents.

[0057] Reference numerals list

[0058] Cylinder 1

[0059] First chamber 11

[0060] Second cavity 12

[0061] Piston 2

[0062] Piston rod 3

[0063] First damping valve 4

[0064] Second damping valve 5

[0065] Accumulator 6

[0066] Bidirectional oil pump 7

[0067] Switch valve 8

[0068] Damping branch 91

[0069] Power branch 92

Claims

1. An active suspension actuator, characterized in that: The active suspension actuator comprises an actuator body and a circulating oil circuit, wherein the actuator body comprises: Cylinder body (1); a piston (2), the piston (2) being located inside the cylinder (1), the piston (2) and the inner surface of the cylinder (1) being in sealing contact and relatively movable, the piston (2) dividing the cylinder (1) into a first chamber (11) and a second chamber (12); and A piston rod (3), the piston rod (3) being connected to the piston (2) and passing through the second chamber (12) and extending out of the cylinder body (1); One end of the circulating oil circuit is connected to the first chamber (11), and the other end is connected to the second chamber (12), and the circulating oil circuit comprises: a damping branch (91), the damping branch (91) being configured to provide a damping force to the hydraulic oil flowing from the first chamber (11) into the second chamber (12) and to the hydraulic oil flowing from the second chamber (12) into the first chamber (11); and A power branch (92), the power branch (92) and the damping branch (91) are connected in parallel, and the power branch (92) is configured to provide power to the hydraulic oil flowing from the first chamber (11) into the second chamber (12) and to the hydraulic oil flowing from the second chamber (12) into the first chamber (11).

2. The active suspension actuator according to claim 1, characterized in that: The damping branch (91) comprises a first damping valve (4) and a second damping valve (5), wherein the first damping valve (4) is close to the first chamber (11), and the second damping valve (5) is close to the second chamber (12), the first damping valve (4) and the second damping valve (5) are both one-way damping valves, and the first damping valve (4) and the second damping valve (5) are arranged in opposite directions.

3. The active suspension actuator according to claim 2, characterized in that: The damping branch (91) further comprises an accumulator (6), wherein the accumulator (6) is located between the first damping valve (4) and the second damping valve (5).

4. The active suspension actuator according to claim 2, characterized in that: The first damping valve (4) and the second damping valve (5) are electrically controlled adjustable damping valves.

5. The active suspension actuator according to claim 1, characterized in that: The power branch (92) comprises a bidirectional oil pump (7).

6. The active suspension actuator according to claim 5, characterized in that: The power branch (92) further comprises a switch valve (8), and the switch valve (8) is connected in series with the bidirectional oil pump (7).

7. The active suspension actuator according to claim 6, characterized in that: The switch valve (8) is in a normally closed state.

8. A vehicle suspension system, characterized in that: The vehicle suspension system comprises the active suspension actuator according to any one of claims 1-7.

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