Active suspension system with high response speed

Abstract

The invention discloses an active suspension system with a high response speed, and relates to the technical field of automobile suspensions. The device comprises a hydraulic cylinder, a supporting spring, a control box, a liquid storage cylinder and a magnetic axis type linear motor structure. Force transmission is achieved through linkage of the hydraulic cylinder, the lower swing arm and the force transmission swing arm, resistance of hydraulic oil is adjusted through a control box flowing channel, the magnetic axis type linear motor drives the adjusting piston block to change the cross section area of the channel, and therefore the hardness of the suspension is rapidly adjusted. The system is provided with a liquid storage cylinder and a synchronous reset spring for realizing dynamic volume adjustment of hydraulic oil and avoiding impact and cavitation. The system has the advantages of being high in response speed, large in damping adjustment range, high in reliability and excellent in comfort, and is suitable for active suspension control of vehicles on complex road surfaces and under high-speed working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile suspension, in particular to a high-response-speed active suspension system. BACKGROUND

[0002] Most of the existing active suspension systems adopt electromagnetic or traditional hydraulic structures. Traditional hydraulic suspensions rely on fixed orifice throttles to control the flow of hydraulic oil, and cannot adapt to the rapid changes in the road surface in real time. Although electromagnetic suspensions have certain response advantages, their structure is complex, and once damaged, the maintenance value is extremely low. On the other hand, the existing hydraulic systems generally lack dynamic volume adjustment mechanisms, and the hydraulic oil is prone to cavitation or local high pressure under the impact of instantaneous large flow, causing system fatigue damage. The existing technologies generally have the problems of insufficient response speed, poor oil return, and low reliability, which are difficult to meet the dynamic needs of modern vehicles under high-speed working conditions and complex road surfaces. SUMMARY

[0003] In order to overcome the defects of the prior art, the present application provides the following technical scheme: a high-response-speed active suspension system, comprising a middle connecting beam, two swing mounting brackets are fixedly installed on the middle connecting beam, a hydraulic cylinder support is fixedly installed on each of the two swing mounting brackets, a lower swing arm and an upper swing arm are movably installed on each of the two swing mounting brackets, a vertical swing bracket is movably installed between the ends of the lower swing arm and the upper swing arm away from the swing mounting bracket, the vertical swing bracket is parallel to the swing mounting bracket, and a hub mounting flange for mounting a hub is rotatably installed on the vertical swing bracket; a hydraulic cylinder is movably installed on each of the hydraulic cylinder supports, a hydraulic piston is slidably and sealingly installed on the inner wall of each of the hydraulic cylinders, one end of the hydraulic piston is fixedly installed with a hydraulic piston rod, the hydraulic piston rod is coaxially arranged in the hydraulic cylinder, and a force transmission swing arm is fixedly installed at the end of the hydraulic piston rod away from the hydraulic piston. It should be noted that the bottom end of the hydraulic cylinder is in sliding fit with the outer surface of the hydraulic piston rod, and the bottom end of the hydraulic cylinder is provided with an exhaust hole. When the hydraulic piston slides downward in the hydraulic cylinder, the air in the space at the bottom of the hydraulic cylinder is exhausted.

[0004] Preferably, the force transmission swing arm is movably installed on a force transmission swing mounting seat, the force transmission swing mounting seat is fixedly installed on the lower swing arm, and a long strip-shaped through hole is formed in the middle of the force transmission swing arm, and a transmission shaft is arranged in the long strip-shaped through hole.

[0005] Preferably, a support spring is sleeved around the outside of the hydraulic cylinder, and the top end of the support spring is fixedly connected with the hydraulic cylinder and the force transmission swing arm, respectively.

[0006] Preferably, the vertical swing frame and the swing mounting frame are respectively rotatably mounted with an outer universal joint and an inner universal joint, and the outer universal joint and the inner universal joint are drivingly connected through a transmission shaft, wherein the outer universal joint is fixedly and synchronously rotated with the hub mounting flange plate.

[0007] Preferably, the two liquid storage cylinders are further fixedly mounted on the intermediate connecting beam, the inner wall of each of the two liquid storage cylinders is provided with an inner cover cylinder, the inner wall of the inner cover cylinder is fixedly mounted with an intermediate pipe, and the intermediate pipe is in communication with the interior of the liquid storage cylinder, wherein the inner cover cylinder and the inner wall of the liquid storage cylinder are fixedly connected through a plurality of connecting support beam plates.

[0008] Preferably, a gap is arranged between the inner wall of the liquid storage cylinder and the circumferential surface of the inner cover cylinder, a synchronous sliding piston sleeve is slidingly and sealingly arranged in the gap, a synchronous sliding sleeve is arranged at the upper axial position of the synchronous sliding piston sleeve, the synchronous sliding sleeve is slidingly sleeved on the circumferential surface of the intermediate pipe, the synchronous sliding sleeve and the synchronous sliding piston sleeve are fixedly connected through a plurality of synchronous connecting linkages, and the outer side of the intermediate pipe is sleeved with a synchronous return spring, and the two ends of the synchronous return spring are fixedly connected with the synchronous sliding sleeve and the bottom of the inner cover cylinder, respectively.

[0009] Preferably, the control box is fixedly mounted on each hydraulic cylinder support, the control box is composed of a one-way flow channel and an adjusting flow channel which are arranged in parallel and in communication, the two ends of the control box are respectively provided with a first hydraulic port and a second hydraulic port, the second hydraulic port is in communication with the intermediate pipe through a drainage pipe, and the first hydraulic port is in communication with the hydraulic cylinder through a drainage hose.

[0010] Preferably, the one-way flow channel is provided with a one-way valve inside, which is used to cut off the flow of hydraulic oil from the first hydraulic port to the second hydraulic port; the middle part of the adjusting flow channel is provided with an adjusting piston cavity, the adjusting piston cavity is in vertical communication with the inside of the adjusting flow channel, and the inner wall of the adjusting piston cavity is slidingly and sealingly mounted with an adjusting piston block, the adjusting piston block is used to adjust the cross-sectional area of the adjusting flow channel and change the flow resistance of the hydraulic oil inside the adjusting flow channel; and each hydraulic cylinder support is fixedly mounted with a magnetic shaft type linear motor, the actuating rod end of the magnetic shaft type linear motor is fixedly connected with the adjusting piston block through a connecting block, and is used to drive the adjusting piston block to slide in the adjusting piston cavity.

[0011] Preferably, the liquid storage cylinder, the intermediate pipe, the drainage pipe, the control box, the drainage hose and the hydraulic cylinder are internally provided with hydraulic oil flowing through.

[0012] Compared with the prior art, the present application has the following beneficial effects: (1) The present application realizes the rapid controllable adjustment of the flow resistance of hydraulic oil by the combination of the adjusting flow channel inside the control box and the magnetic shaft type linear motor of the hydraulic cylinder. Compared with the traditional adjustment mode relying on fixed throttle or passive valve, the present application can complete the suspension stiffness adjustment within a millisecond response range, greatly improves the adaptability of the whole vehicle to complex road impact, makes the suspension switching between soft and hard more smooth, and thus improves the control stability and ride comfort of the vehicle; (2) The present application forms a composite suspension effect by the interaction of hydraulic pressure and elasticity through the increase of the supporting spring outside the hydraulic cylinder. When the vehicle is impacted, the hydraulic damping is responsible for absorbing most of the energy, and the supporting spring can deform quickly to offset part of the transient impact force. This double buffering mechanism significantly reduces the longitudinal vibration transmission of the vehicle body, improves the fatigue life and reliability of the system, and also makes the vehicle maintain excellent damping effect in long-term operation; (3) The present application forms a variable volume hydraulic buffer unit by setting the liquid storage cylinder, the intermediate pipe and the synchronous sliding piston sleeve. It can provide additional volume when the hydraulic oil increases instantaneously, avoid the occurrence of hydraulic impact and cavitation, and the action of the synchronous return spring ensures the stable return flow of the hydraulic oil in circulation. The dynamic stability of the suspension system is fundamentally improved; (4) The present application adopts the linkage design of the force transmission swing arm and the lower swing arm, so that the force transmission path between the tire and the suspension movement is more direct, the energy loss is reduced, and since the hydraulic cylinder and the liquid storage cylinder are designed separately, it is easier to repair when damaged; (5) The present application realizes the flow distribution and resistance optimization of hydraulic oil under different working conditions through double-channel hydraulic control (combination of one-way flow channel and adjusting flow channel). When the tire falls back quickly, the hydraulic oil almost returns to the hydraulic cylinder without resistance, ensuring that the tire maintains close contact with the ground; and when it is compressed by impact, the hydraulic oil is controlled to flow, providing sufficient damping support. This differential fluid control structure greatly improves the adhesion of the vehicle to dynamic road conditions, effectively reducing wheel hopping and adhesion loss. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0014] Figure 2 It is a schematic diagram of the structure at the swing mounting bracket of the present application.

[0015] Figure 3 It is a schematic diagram of the structure at A of the present application. Figure 2

[0016] Figure 4 It is a schematic diagram of the structure of the control box of the present application.

[0017] Figure 5 It is a schematic diagram of the structure at the hydraulic cylinder of the present application.​

[0018] Figure 6 Structure diagram of the transmission arm.

[0019] Figure 7 Structure diagram of the vertical swing frame.

[0020] In the figure: 101-swing mounting frame; 102-hydraulic cylinder support; 103-hydraulic cylinder; 104-support spring; 105-lower swing arm; 106-upper swing arm; 107-vertical swing frame; 108-hub mounting flange; 109-hydraulic piston; 110-hydraulic piston rod; 111-transmission arm; 112-transmission swing mounting seat; 113-transmission shaft; 114-outer universal joint; 115-inner universal joint; 116-control box; 117-magnetic shaft type linear motor; 118-drainage pipe; 119-drainage hose; 120-connection block; 121-adjustment piston block; 122-adjustment piston cavity; 123-one-way flow passage; 124-adjustment flow passage; 125-first hydraulic port; 126-second hydraulic port; 127-liquid storage cylinder; 128-intermediate pipe; 129-inner cover cylinder; 130-synchronous sliding sleeve; 131-synchronous sliding piston sleeve; 132-synchronous reset spring; 133-synchronous connecting rod frame; 134-connection support beam plate; 135-intermediate connection beam. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be further illustrated below in combination with the accompanying drawings. Figures 1-7 The technical solutions of the present application will be further illustrated below in combination with the accompanying drawings.

[0022] The application provides a high-response-speed active suspension system, which comprises a middle connecting beam 135, two swing mounting racks 101 fixedly installed on the middle connecting beam 135, two hydraulic cylinder supports 102 fixedly installed on the two swing mounting racks 101, a lower swing arm 105 and an upper swing arm 106 movably installed on each swing mounting rack 101 and arranged in parallel, a vertical swing rack 107 movably installed between the ends of the lower swing arm 105 and the upper swing arm 106 away from the swing mounting rack 101, wherein the vertical swing rack 107 is arranged in parallel with the swing mounting rack 101, and a hub mounting flange 108 for mounting a hub is rotatably installed on the vertical swing rack 107, a hydraulic cylinder 103 movably installed on each hydraulic cylinder support 102, a hydraulic piston 109 slidably and sealingly installed on the inner wall of each hydraulic cylinder 103, one end of the hydraulic piston 109 fixedly installed with a hydraulic piston rod 110 coaxially arranged in the hydraulic cylinder 103, one end of the hydraulic piston rod 110 fixedly installed with a force transmission swing arm 111, and the force transmission swing arm 111 movably connected with the lower swing arm 105. It should be noted that the bottom end of the hydraulic cylinder 103 is in sliding fit with the outer surface of the hydraulic piston rod 110, the bottom end of the hydraulic cylinder 103 is provided with an exhaust hole, and when the hydraulic piston 109 slides downward in the hydraulic cylinder 103, the air in the space at the bottom of the hydraulic cylinder 103 is exhausted. The force transmission swing arm 111 is movably installed on a force transmission swing mounting seat 112, the force transmission swing mounting seat 112 is fixedly installed on the lower swing arm 105, a long-hole is formed in the middle of the force transmission swing arm 111, and a transmission shaft 113 is arranged in the long-hole. A supporting spring 104 is sleeved around the outer side of the hydraulic cylinder 103, and the top end of the supporting spring 104 is fixedly connected with the hydraulic cylinder 103 and the force transmission swing arm 111. An outer universal joint 114 and an inner universal joint 115 are rotatably installed on the vertical swing rack 107 and the swing mounting rack 101 respectively, the outer universal joint 114 and the inner universal joint 115 are drivingly connected through the transmission shaft 113, and the outer universal joint 114 is fixedly and synchronously rotated with the hub mounting flange 108.

[0023] Two liquid storage cylinders 127 are fixedly installed on the middle connecting beam 135, and the inner axial positions of the two liquid storage cylinders 127 are provided with inner cover cylinders 129. The inner axial positions of the inner cover cylinders 129 are fixedly installed with middle pipes 128, which are in communication with the interiors of the liquid storage cylinders 127. The inner cover cylinders 129 are fixedly matched with the inner walls of the liquid storage cylinders 127 through a plurality of connecting support beam plates 134. A gap is arranged between the inner wall of the liquid storage cylinder 127 and the circumferential surface of the inner cover cylinder 129, and a synchronous sliding piston sleeve 131 is slidingly and sealingly installed in the gap. The upper axial position of the synchronous sliding piston sleeve 131 is provided with a synchronous sliding sleeve 130, which is slidingly sleeved on the circumferential surface of the middle pipe 128. The synchronous sliding sleeve 130 is fixedly connected with the synchronous sliding piston sleeve 131 through a plurality of synchronous connecting rod frames 133. The outer side of the middle pipe 128 is sleeved with a synchronous reset spring 132, and the two ends of the synchronous reset spring 132 are fixedly connected with the synchronous sliding sleeve 130 and the bottom of the inner cover cylinder 129, respectively. A control box 116 is fixedly installed on each hydraulic cylinder support 102. The control box 116 is composed of a one-way flow channel 123 and an adjusting flow channel 124 which are arranged in parallel and in communication. The two ends of the control box 116 are provided with a first hydraulic port 125 and a second hydraulic port 126. The second hydraulic port 126 is in communication with the middle pipe 128 through a drainage pipe 118. The first hydraulic port 125 is in communication with the hydraulic cylinder 103 through a drainage hose 119. A one-way valve is arranged in the one-way flow channel 123 for cutting off the flow of hydraulic oil from the first hydraulic port 125 to the second hydraulic port 126. An adjusting piston cavity 122 is arranged in the middle of the adjusting flow channel 124. The adjusting piston cavity 122 is in vertical communication with the interior of the adjusting flow channel 124, and the inner wall of the adjusting piston cavity 122 is slidingly and sealingly installed with an adjusting piston block 121. The adjusting piston block 121 is used to adjust the cross-sectional area of the adjusting flow channel 124 and change the flow resistance of the hydraulic oil in the adjusting flow channel 124. A magnetic shaft type linear motor 117 is fixedly installed on each hydraulic cylinder support 102. The actuating rod end of the magnetic shaft type linear motor 117 is fixedly matched with the adjusting piston block 121 through a connecting block 120 for driving the adjusting piston block 121 to slide in the adjusting piston cavity 122. The interiors of the liquid storage cylinder 127, the middle pipe 128, the drainage pipe 118, the control box 116, the drainage hose 119 and the hydraulic cylinder 103 are provided with hydraulic oil flowing through.

[0024] The working principle of the high-response-speed active suspension system disclosed by the application is as follows: in the working process, when the wheel hub is subjected to a vertical upward force (such as being pressed to a convex road surface), the wheel hub mounting flange plate 108 will be subjected to the same force at this time, the wheel hub mounting flange plate 108 will transmit the force to the vertical swing frame 107, the vertical swing frame 107 will move upward, and the vertical swing frame 107 will drive the lower swing arm 105 and the upper swing arm 106 to swing synchronously, wherein the lower swing arm 105 will drive the force transmission swing arm 111 to swing when swinging, the force transmission swing arm 111 will drive the hydraulic piston rod 110 to slide along the axial direction of the hydraulic cylinder 103 (at the same time, the supporting spring 104 is compressed and deformed, and vice versa), the hydraulic piston rod 110 will drive the hydraulic piston 109 to extrude the space inside the hydraulic cylinder 103, so that the hydraulic oil inside the hydraulic cylinder 103 is extruded, the hydraulic oil enters the control box 116 through the drain hose 119, at this time, the hydraulic oil can only flow through the adjusting flow channel 124 (a one-way valve is arranged in the one-way flow channel 123, which is in a closed state at this time), if the adjusting flow channel 124 is in a fully open state in this process, the sliding resistance of the hydraulic piston 109 inside the hydraulic cylinder 103 will be the smallest, that is, the suspension is very soft, on the contrary, if the opening and closing state of the adjusting flow channel 124 inside is very small, this will cause the flow resistance of the hydraulic oil in the adjusting flow channel 124 to be very large, which will cause the sliding resistance of the hydraulic piston 109 inside the hydraulic cylinder 103 to become large, that is, the suspension is very hard. Specifically, the actuating rod of the magnetic shaft type linear motor 117 is controlled to slide, the actuating rod of the magnetic shaft type linear motor 117 drives the adjusting piston block 121 to slide in the adjusting piston cavity 122 through the connecting block 120, the adjusting flow channel 124 inside is blocked or not blocked by the adjusting piston block 121, so as to change the cross-sectional area of the adjusting flow channel 124 inside, and further change the flow resistance of the hydraulic oil through the adjusting flow channel 124. Finally, the hydraulic oil enters the intermediate pipe 128 through the drain pipe 118, and then flows into the liquid storage cylinder 127 inside, at this time, the hydraulic oil inside the liquid storage cylinder 127 increases, so as to extrude the synchronous sliding piston sleeve 131 to slide upward (for increasing the volume inside the liquid storage cylinder 127), the sliding of the synchronous sliding piston sleeve 131 will drive the synchronous sliding sleeve 130 to move synchronously through the synchronous connecting rod frame 133, and the synchronous sliding sleeve 130 will pull the synchronous return spring 132 to deform. When the vertical upward force on the wheel hub disappears, the wheel hub will quickly move downward under the gravity and the elastic force of the synchronous return spring 132 and the supporting spring 104, so that the wheel hub is in contact with the ground.In this process, the lower swing arm 105 will swing down, the lower swing arm 105 drives the transmission force swing arm 111 to swing down, the transmission force swing arm 111 drives the hydraulic piston rod 110 to swing down, the hydraulic piston rod 110 drives the hydraulic piston 109 inside the hydraulic cylinder 103 to slide down, which will cause the pressure inside the hydraulic cylinder 103 to decrease, so that the hydraulic oil outside enters the hydraulic cylinder 103, so the hydraulic oil inside the storage cylinder 127 will flow out, through the intermediate pipe 128 and the drain pipe 118 into the control box 116 (at this time the synchronous sliding piston sleeve 131 slides reversely, and the synchronous reset spring 132 restores the deformation), at this time, the hydraulic oil inside the control box 116 will flow through the one-way flow channel 123 (there will also be part of the flow inside the adjusting flow channel 124), because the one-way flow channel 123 inside has no blockage (the cross-sectional area of the one-way valve in the fully open state is the same as the one-way flow channel 123 body), at this time the flow of hydraulic oil almost has no resistance to flow into the hydraulic cylinder 103 through the drain hose 119, which can make the hydraulic piston 109 inside the hydraulic cylinder 103 slide quickly and in detail, so that the wheel hub moves faster in the process of swinging down.

Claims

1. A high response rate active suspension system characterized by: The intermediate connecting beam (135) is provided with two swing mounting racks (101), and the two swing mounting racks (101) are provided with hydraulic cylinder supports (102). The hydraulic cylinder (103) is movably arranged on each hydraulic cylinder support (102), and the inner wall of each hydraulic cylinder (103) is slidably and sealingly provided with a hydraulic piston (109).

2. The high response rate active suspension system of claim 1, wherein: The hydraulic piston (109) is provided with a hydraulic piston rod (110) at one end, and the hydraulic piston rod (110) is coaxially arranged in the hydraulic cylinder (103).

3. A high response rate active suspension system according to claim 2, wherein: The hydraulic cylinder (103) is provided with a support spring (104) on the outside, and the top end of the support spring (104) is fixedly connected with the hydraulic cylinder (103) and the force transmission swing arm (111).

4. A high response rate active suspension system according to claim 3, wherein: The outer universal joint (114) and the inner universal joint (115) are rotatably arranged on the vertical swing frame (107) and the swing mounting rack (101), respectively.

5. A high response rate active suspension system according to claim 4, wherein: The outer universal joint (114) and the inner universal joint (115) are drivingly connected through the transmission shaft (113), and the outer universal joint (114) is fixedly and synchronously rotated with the hub mounting flange (108). The intermediate connecting beam (135) is provided with two swing mounting racks (101), and the two swing mounting racks (101) are provided with hydraulic cylinder supports (102). The inner wall of the inner cover cylinder (129) is fixedly connected with the inner wall of the liquid storage cylinder (127) through a plurality of connecting support beam plates (134).

6. A high response rate active suspension system according to claim 5, wherein: The gap is provided between the inner wall of the liquid storage cylinder (127) and the circumferential surface of the inner side cover cylinder (129), and the synchronous sliding piston sleeve (131) is slidingly and sealingly installed in the gap. The synchronous sliding sleeve (130) is arranged at the axial position above the synchronous sliding piston sleeve (131), and the synchronous sliding sleeve (130) is slidingly arranged on the circumferential surface of the middle pipe (128). The synchronous sliding sleeve (130) and the synchronous sliding piston sleeve (131) are fixedly connected through a plurality of synchronous connecting rods (133). The outer side of the middle pipe (128) is surrounded by the synchronous reset spring (132), and the two ends of the synchronous reset spring (132) are fixedly connected with the synchronous sliding sleeve (130) and the bottom of the inner side cover cylinder (129), respectively.

7. A high response rate active suspension system according to claim 6, wherein: The control box (116) is fixedly installed on each hydraulic cylinder support (102), and the control box (116) is composed of a one-way flow channel (123) and an adjusting flow channel (124) which are arranged in parallel and in communication. The two ends of the control box (116) are provided with a first hydraulic port (125) and a second hydraulic port (126). The second hydraulic port (126) and the middle pipe (128) are communicated through a drain pipe (118). The first hydraulic port (125) and the hydraulic cylinder (103) are communicated through a drain hose (119).

8. A high response rate active suspension system according to claim 7, wherein: The one-way flow channel (123) is provided with a one-way valve for cutting off the flow of hydraulic oil from the first hydraulic port (125) to the second hydraulic port (126). The middle part of the adjusting flow channel (124) is provided with an adjusting piston cavity (122), which is vertically communicated with the inside of the adjusting flow channel (124), and the inner wall of the adjusting piston cavity (122) is slidingly and sealingly installed with an adjusting piston block (121). The adjusting piston block (121) is used to adjust the cross-sectional area of the adjusting flow channel (124) and change the flow resistance of the hydraulic oil in the adjusting flow channel (124). Each hydraulic cylinder support (102) is fixedly installed with a magnetic shaft type linear motor (117), and the actuating rod end of the magnetic shaft type linear motor (117) is fixedly connected with the adjusting piston block (121) through a connecting block (120), which is used to drive the adjusting piston block (121) to slide in the adjusting piston cavity (122).

9. A high response rate active suspension system according to claim 8, wherein: The liquid storage cylinder (127), the middle pipe (128), the drain pipe (118), the control box (116), the drain hose (119) and the hydraulic cylinder (103) are provided with through-flowing hydraulic oil.

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