Suspension system capable of rapidly changing height of vehicle body and working method of suspension system

Abstract

The invention discloses a suspension system capable of rapidly changing the height of a vehicle body and a working method thereof.The suspension system comprises a shock absorber and a hydraulic lifting mechanism, a lower supporting plate used for being connected with an axle or wheels is arranged at the bottom of the shock absorber, the top of the shock absorber is connected with the vehicle body, and the hydraulic lifting mechanism comprises an oil cylinder assembly and a hydraulic control system; a plurality of telescopic upper piston rods are arranged at the top of the oil cylinder assembly, the movable ends of the upper piston rods are connected with the vehicle body, a plurality of telescopic lower piston rods are arranged at the bottom of the oil cylinder assembly, and the movable ends of the lower piston rods are connected with the lower supporting plate. The oil cylinder assembly is arranged in the limited space between the vehicle body and the axle or the wheels, the extending directions of the upper piston rod and the lower piston rod on the oil cylinder assembly are opposite, large-range height adjustment of the vehicle body can be achieved, different running conditions of the vehicle can be met, the trafficability of the vehicle in different environments is effectively improved, and the vehicle safety is improved. And the use scene of the vehicle is widened.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile parts, and in particular relates to a suspension system for rapidly changing the height of a vehicle body and a working method thereof. Background Art

[0002] When a vehicle is driving, the elastic elements (such as air springs or coil springs) in the suspension system vibrate due to impact. In order to improve driving smoothness, shock absorbers are usually installed in parallel with the elastic elements in the suspension to attenuate the vibration transmitted to the vehicle body. The principle of the shock absorber is that when the frame or body and the axle are vibrated and relative movement occurs, the piston in the shock absorber moves up and down, and the oil in the shock absorber cavity repeatedly flows from one cavity to another through different pores. The friction between the pore wall and the oil and the friction between the oil molecules form a damping force on the vibration, even if the mechanical energy of the vibration is converted into heat energy of the oil and dissipated, the function of attenuating the vibration is achieved.

[0003] Among the vehicles currently produced and sold, the height of the vehicle body cannot be adjusted, which greatly limits the use scenarios of the vehicle. A few vehicles use an air suspension system that integrates shock absorbers to increase the height of the vehicle body. The air suspension system can change the height of the vehicle body to adapt to different driving environments by monitoring road conditions, vehicle speed, etc. However, the existing air suspension system structure is relatively complex, and the air spring has a limited life, resulting in a high frequency of vehicle failures, and high subsequent vehicle use and maintenance costs. Summary of the invention

[0004] The object of the present invention is to provide a suspension system for rapidly changing the height of a vehicle body and a working method thereof, so as to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, on the one hand, the present invention adopts the following technical solutions: a suspension system for quickly changing the height of a vehicle body, comprising a shock absorber and a hydraulic lifting mechanism, wherein the bottom of the shock absorber is provided with a lower support plate for connecting to an axle or a wheel, the top of the shock absorber is connected to the vehicle body, and the hydraulic lifting mechanism is arranged between the lower support plate and the vehicle body; the hydraulic lifting mechanism comprises a cylinder assembly and a hydraulic control system, the top of the cylinder assembly is provided with a plurality of telescopic and movable upper piston rods, the movable ends of the upper piston rods are connected to the vehicle body, the bottom of the cylinder assembly is provided with a plurality of telescopic and movable lower piston rods, the movable ends of the lower piston rods are connected to the lower support plate, and the hydraulic control system is used to control the telescopic activities of the upper and lower piston rods.

[0006] As an optional implementation of the above technical solution, an upper support plate and an elastic member are provided between the cylinder assembly and the vehicle body, the upper support plate is connected to the movable end of the upper piston rod, the two ends of the elastic member are respectively connected to the upper support plate and the vehicle body, and the elastic member is used to drive the upper piston rod and the lower piston rod to return to their positions.

[0007] As an optional implementation of the above technical solution, the elastic member includes a return spring, and a first buffer member is provided between the return spring and the vehicle body.

[0008] As an optional implementation of the above technical solution, a second buffer is provided between the shock absorber and the vehicle body.

[0009] As an optional implementation of the above technical solution, the lower support plate includes a plate-like support portion and a cylindrical guide portion, one end of the cylindrical guide portion is connected to the plate-like support portion, the bottom end of the lower piston rod is connected to the plate-like support portion, and the cylinder assembly and the upper support plate are both slidably arranged on the outside of the cylindrical guide portion; the shock absorber is arranged on the inside of the cylindrical guide portion, or the shock absorber and the cylindrical guide portion are arranged side by side.

[0010] As an optional implementation of the above technical solution, four upper piston rods evenly arranged in a ring shape are provided on the top of the cylinder assembly, and four lower piston rods evenly arranged in a ring shape are provided on the bottom of the cylinder assembly, and the lower piston rods are staggered with the upper piston rods.

[0011] As an optional implementation of the above technical solution, an upper cover plate and a lower cover plate are respectively provided at both ends of the cylinder assembly, an upper cylinder body adapted to the upper piston rod is provided at the top of the cylinder assembly, an upper through hole adapted to the upper piston rod is provided on the upper cover plate, a first oil chamber is provided between the upper piston rod and the lower cover plate, a first oil inlet and outlet connected to the first oil chamber is provided on the upper cylinder body, and an upper sealing ring is provided on the inner wall of the upper cylinder body; a lower cylinder body adapted to the lower piston rod is provided at the bottom of the cylinder assembly, a lower through hole adapted to the lower piston rod is provided on the lower cover plate, a second oil chamber is provided between the lower piston rod and the upper cover plate, a second oil inlet and outlet connected to the second oil chamber is provided on the lower cylinder body, and a lower sealing ring is provided on the inner wall of the lower cylinder body.

[0012] As an optional implementation manner of the above technical scheme, an oil circuit connecting piece is provided on the outer side of the cylinder assembly, and a first oil circuit connecting groove and a second oil circuit connecting groove are provided between the oil circuit connecting piece and the outer wall of the cylinder assembly, the first oil circuit connecting groove is connected to the first oil inlet and outlet, and the second oil circuit connecting groove is connected to the second oil inlet and outlet; a first oil circuit interface and a second oil circuit interface are provided on the oil circuit connecting piece, the first oil circuit interface is connected to the first oil circuit connecting groove, and the second oil circuit interface is connected to the second oil circuit connecting groove; a first sealing ring, a second sealing ring and a third sealing ring are also provided between the oil circuit connecting piece and the outer wall of the cylinder assembly, the first oil circuit connecting groove is located between the first sealing ring and the second sealing ring, and the second oil circuit connecting groove is located between the second sealing ring and the third sealing ring.

[0013] As an optional implementation of the above technical solution, a limit baffle is provided on the oil cylinder assembly, and the limit baffle is equipped with a first travel switch; the upper support plate is equipped with a second travel switch.

[0014] As an optional implementation of the above technical solution, the hydraulic control system includes an oil tank, an oil pump, a one-way valve, a first solenoid reversing valve, a second solenoid reversing valve and an oil return pipeline. One end of the oil pump is connected to the oil tank, and the other end of the oil pump is connected to the one-way valve. The output end of the one-way valve is respectively connected to the first interface of the first solenoid reversing valve and the first interface of the second solenoid reversing valve. The second interface of the first solenoid reversing valve is connected to the first oil inlet pipeline, and the first oil inlet pipeline is connected to each first oil chamber; the second interface of the second solenoid reversing valve is connected to the second oil inlet pipeline, and the second oil inlet pipeline is connected to each second oil chamber; the third interface of the first solenoid reversing valve and the third interface of the second solenoid reversing valve are both connected to the oil tank through the oil return pipeline.

[0015] As an optional implementation of the above technical solution, a third electromagnetic reversing valve and a throttle valve are provided on the oil return pipeline, and the third electromagnetic reversing valve and the throttle valve are connected in parallel on the oil return pipeline.

[0016] As an optional implementation of the above technical solution, the hydraulic control system also includes a high-pressure accumulator, which is arranged at the output end of the one-way valve, and the high-pressure accumulator is respectively connected to the first interface of the first solenoid reversing valve and the first interface of the second solenoid reversing valve.

[0017] On the other hand, the present invention adopts the following technical solution: a working method of the suspension system for quickly changing the vehicle body height, comprising:

[0018] When the vehicle is in a normal driving state, the hydraulic control system controls the upper piston rod to be in an extended state and the lower piston rod to be in a retracted state, or the upper piston rod to be in a retracted state and the lower piston rod to be in an extended state;

[0019] When the vehicle is in or about to be in an out-of-control state, the first solenoid reversing valve and the third solenoid reversing valve are energized, and the upper piston rod is turned from an extended state to a retracted state, or the second solenoid reversing valve and the third solenoid reversing valve are energized, and the lower piston rod is turned from an extended state to a retracted state, and the height of the vehicle body is gradually reduced, thereby reducing or eliminating the occurrence of accidents;

[0020] When the vehicle is about to collide or is about to be collided by other vehicles, the high-pressure accumulator and the oil pump supply oil to the first oil chamber and the second oil chamber, the upper piston rod and the lower piston rod are both in an extended state, and the height of the vehicle body is rapidly increased, thereby changing the collision position of the vehicle, thereby reducing the severity of the accident;

[0021] When the vehicle is in a completely out-of-control state, the first solenoid reversing valve, the second solenoid reversing valve and the third solenoid reversing valve are energized, the upper piston rod and the lower piston rod are rapidly contracted, and the vehicle body height is rapidly reduced to the minimum, which is conducive to quickly and safely controlling the vehicle body.

[0022] The beneficial effects of the present invention are:

[0023] The present invention arranges a cylinder assembly in a limited space between the vehicle body and the axle or wheel. The extension directions of the upper piston rod and the lower piston rod on the cylinder assembly are opposite, so that the height adjustment of the vehicle body can be realized in a large range and can meet different driving conditions of the vehicle. It effectively improves the passability of the vehicle in different environments and broadens the use scenarios of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a suspension system in a first embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a suspension system in a second embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a hydraulic lifting mechanism in one embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of an oil cylinder assembly, an upper piston rod and a lower piston rod in one embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the layout structure of the upper piston rod and the lower piston rod in one embodiment of the present invention;

[0029] Figure 6 is a schematic cross-sectional structure diagram of an oil cylinder assembly in a first embodiment of the present invention;

[0030] Figure 7 It is a schematic cross-sectional structure diagram of the oil cylinder assembly in the second embodiment of the present invention.

[0031] In the figure: 1- shock absorber; 2- wheel; 3- lower support plate; 4- vehicle body; 5- oil cylinder assembly; 6- upper piston rod; 7- lower piston rod; 8- upper support plate; 9- return spring; 10- first buffer; 11- second buffer; 12- upper cylinder body; 13- upper cover plate; 14- lower cover plate; 15- first oil chamber; 16- first oil inlet and outlet; 17- upper sealing ring; 18- first sealing ring; 19- lower cylinder body; 20- upper through hole; 21- lower through hole; 22- second oil chamber; 23- second oil inlet and outlet ; 24-lower sealing ring; 25-second sealing ring; 26-oil tank; 27-oil pump; 28-check valve; 29-first solenoid reversing valve; 30-second solenoid reversing valve; 31-third solenoid reversing valve; 32-throttle valve; 33-high-pressure accumulator; 34-first oil circuit interface; 35-oil circuit connecting piece; 36-first oil circuit connecting groove; 37-second oil circuit interface; 38-third sealing ring; 39-second oil circuit connecting groove; 40-limit baffle; 41-first travel switch; 42-second travel switch. DETAILED DESCRIPTION

[0032] like Figure 1-Figure 7 As shown, this embodiment provides a suspension system for quickly changing the height of a vehicle body, including a shock absorber 1 and a hydraulic lifting mechanism, wherein the bottom of the shock absorber 1 is provided with a lower support plate 3 for connecting to an axle or a wheel 2, and the top of the shock absorber 1 is directly or indirectly connected to a vehicle body 4. The hydraulic lifting mechanism is arranged between the lower support plate 3 and the vehicle body 4, and the hydraulic lifting mechanism can move up and down, thereby driving the vehicle body 4 to rise or fall, so as to adapt to different driving environments.

[0033] Specifically, the hydraulic lifting mechanism includes a cylinder assembly 5 and a hydraulic control system. The top of the cylinder assembly 5 is provided with a plurality of telescopic upper piston rods 6, the movable ends of the upper piston rods 6 are directly or indirectly connected to the vehicle body 4, and the bottom of the cylinder assembly 5 is provided with a plurality of telescopic lower piston rods 7, the movable ends of the lower piston rods 7 are connected to the lower support plate 3, and the hydraulic control system is used to control the telescopic activities of the upper piston rods 6 and the lower piston rods 7. It should be noted that the number of the upper piston rods 6 and the lower piston rods 7 can be set according to specific needs. Under the action of the hydraulic control system, a plurality of upper piston rods 6 can perform synchronous telescopic activities, and a plurality of lower piston rods 7 can perform synchronous telescopic activities.

[0034] The present invention arranges a cylinder assembly 5 in a limited space between a vehicle body 4 and a vehicle axle or a wheel 2. The upper piston rod 6 and the lower piston rod 7 on the cylinder assembly 5 extend in opposite directions, so that the vehicle body 4 can be adjusted in a wide range of height to meet different driving conditions of the vehicle. This effectively improves the vehicle's passability in different environments and broadens the vehicle's usage scenarios.

[0035] Among them, an upper support plate 8 and an elastic member are provided between the oil cylinder assembly 5 and the vehicle body 4, the upper support plate 8 is connected to the movable end of the upper piston rod 6, and the two ends of the elastic member are respectively connected to the upper support plate 8 and the vehicle body 4, and the elastic member is used to drive the upper piston rod 6 and the lower piston rod 7 to return. Specifically, the elastic member includes a return spring 9, and the return spring 9 is connected to the upper support plate 8.

[0036] In a specific embodiment, the oil cylinder assembly 5 and the shock absorber 1 are arranged side by side, a first buffer 10 is provided between the return spring 9 and the vehicle body 4 , and a second buffer 11 is provided between the top of the shock absorber 1 and the vehicle body 4 .

[0037] In a specific embodiment, the lower support plate 3 includes a plate-shaped support portion and a cylindrical guide portion, the bottom end of the cylindrical guide portion is connected to the plate-shaped support portion, the bottom end of the lower piston rod 7 is connected to the plate-shaped support portion, the oil cylinder assembly 5 and the upper support plate 8 are both slidably arranged on the outside of the cylindrical guide portion, and the shock absorber 1 is arranged on the inside of the cylindrical guide portion. A first buffer 10 is arranged between the return spring 9 and the vehicle body 4, and the top of the shock absorber 1 is connected to the vehicle body 4 through the first buffer 10.

[0038] In a specific embodiment, four upper piston rods 6 are evenly arranged in a ring shape at the top of the cylinder assembly 5, and four lower piston rods 7 are evenly arranged in a ring shape at the bottom of the cylinder assembly 5, and the lower piston rods 7 and the upper piston rods 6 are staggered with each other, thereby reducing the space occupied by the cylinder assembly 5 and increasing the height adjustment range of the vehicle body 4.

[0039] Among them, the two ends of the cylinder assembly 5 are respectively provided with an upper cover plate 13 and a lower cover plate 14, both of which are annular structures. The upper cover plate 13 and the lower cover plate 14 can be integrally formed with the cylinder assembly 5, or can be separately installed at the two ends of the cylinder assembly 5. An upper cylinder body 12 adapted to the upper piston rod 6 is provided at the top of the cylinder assembly 5, an upper through hole 20 adapted to the upper piston rod 6 is provided in the upper cover plate 13, a first oil chamber 15 is provided between the upper piston rod 6 and the lower cover plate 14, the upper cylinder body 12 is provided with a first oil inlet and outlet 16 connected to the first oil chamber 15, and an upper sealing ring 17 is provided on the inner wall of the upper cylinder body 12; a lower cylinder body 19 adapted to the lower piston rod 7 is provided at the bottom of the cylinder assembly 5, the lower cover plate 14 is provided with a lower through hole 21 adapted to the lower piston rod 7, a second oil chamber 22 is provided between the lower piston rod 7 and the upper cover plate 13, the lower cylinder body 19 is provided with a second oil inlet and outlet 23 connected to the second oil chamber 22, and a lower sealing ring 24 is provided on the inner wall of the lower cylinder body 19.

[0040] An oil circuit connecting piece 35 is provided on the outer side of the oil cylinder assembly 5. An annular first oil circuit connecting groove 36 and a second oil circuit connecting groove 39 are provided between the oil circuit connecting piece 35 and the outer wall of the oil cylinder assembly 5. The first oil circuit connecting groove 36 is connected to each first oil inlet and outlet 16, and the second oil circuit connecting groove 39 is connected to each second oil inlet and outlet 23. The oil circuit connecting piece 35 is provided with a first oil circuit interface 34 and a second oil circuit interface 37. The first oil circuit interface 34 is connected to the first oil circuit connecting groove 36, and the second oil circuit interface 37 is connected to the second oil circuit connecting groove 39. A first sealing ring 18, a second sealing ring 25 and a third sealing ring 38 are provided between the oil circuit connecting piece 35 and the outer wall of the oil cylinder assembly 5 in sequence. The first oil circuit connecting groove 36 is located between the first sealing ring 18 and the second sealing ring 25 to seal the first oil circuit connecting groove 36. The second oil circuit connecting groove 39 is located between the second sealing ring 25 and the third sealing ring 38 to seal the second oil circuit connecting groove 39.

[0041] Preferably, a limit baffle 40 is provided on the oil cylinder assembly 5 , and the limit baffle 40 is equipped with a first travel switch 41 ; and the upper support plate 8 is equipped with a second travel switch 42 .

[0042] Specifically, the hydraulic control system includes an oil tank 26, an oil pump 27, a one-way valve 28, a first electromagnetic reversing valve 29, a second electromagnetic reversing valve 30 and an oil return pipeline. One end of the oil pump 27 is connected to the oil tank 26, and the other end of the oil pump 27 is connected to the one-way valve 28. The output end of the one-way valve 28 is respectively connected to the first interface of the first electromagnetic reversing valve 29 and the first interface of the second electromagnetic reversing valve 30. The second interface of the first electromagnetic reversing valve 29 is connected to a first oil inlet pipeline, which is connected to each first oil chamber 15; the second interface of the second electromagnetic reversing valve 30 is connected to a second oil inlet pipeline, which is connected to each second oil chamber 22; the third interface of the first electromagnetic reversing valve 29 and the third interface of the second electromagnetic reversing valve 30 are both connected to the oil tank 26 through the oil return pipeline. Preferably, a third electromagnetic reversing valve 31 and a throttle valve 32 are provided on the oil return pipeline, and the third electromagnetic reversing valve 31 and the throttle valve 32 are connected in parallel on the oil return pipeline. The hydraulic control system further includes a high-pressure accumulator 33 , which is disposed at the output end of the one-way valve 28 and is communicated with a first interface of the first electromagnetic reversing valve 29 and a first interface of the second electromagnetic reversing valve 30 , respectively.

[0043] This embodiment also provides a working method of the above suspension system, including:

[0044] When the vehicle is in a normal driving state, the hydraulic control system controls the upper piston rod 6 to be in an extended state and the lower piston rod 7 to be in a retracted state, or the upper piston rod 6 to be in a retracted state and the lower piston rod 7 to be in an extended state. That is, one of the upper piston rod 6 and the lower piston rod 7 is kept in an extended state and the other is kept in a retracted state, and the vehicle body 4 is kept at a suitable height.

[0045] When the vehicle is in or about to be in an out-of-control state, the first solenoid reversing valve 29 and the third solenoid reversing valve 31 are energized, and the upper piston rod 6 changes from an extended state to a retracted state, or the second solenoid reversing valve 30 and the third solenoid reversing valve 31 are energized, and the lower piston rod 7 changes from an extended state to a retracted state, and the height of the vehicle body 4 gradually decreases, thereby reducing or eliminating the occurrence of accidents.

[0046] When the vehicle is about to collide or is about to be collided by other vehicles, the high-pressure accumulator 33 and the oil pump 27 supply oil to the first oil chamber 15 and the second oil chamber 22, the upper piston rod 6 and the lower piston rod 7 are both in an extended state, and the height of the vehicle body 4 is rapidly increased, thereby changing the collision site of the vehicle and reducing the severity of the accident.

[0047] When the vehicle is in a completely out-of-control state, the first solenoid reversing valve 29, the second solenoid reversing valve 30 and the third solenoid reversing valve 31 are energized, the upper piston rod 6 and the lower piston rod 7 are rapidly retracted, and the height of the vehicle body 4 is rapidly reduced to the minimum, which is conducive to quickly and safely controlling the vehicle body 4.

[0048] In this embodiment, the oil cylinder assembly 5 is designed in two structural forms: Figure 6 )and( Figure 7 ); For the first structural form of the cylinder assembly 5, such as Figure 4 and Figure 7 As shown, the oil cylinder assembly 5 includes an upper cylinder body 12, an upper piston rod 6 (a total of 4, respectively installed at A1, A2, A3 and A4), an upper cover plate 13, an upper sealing ring 17, a lower sealing ring 24, a lower cover plate 14, a lower cylinder body 19 and a lower piston rod 7 (a total of 4, respectively installed at B1, B2, B3 and B4); a total of four upper cylinder bodies 12 and four lower cylinder bodies 19 are processed on the oil cylinder assembly 5, and the sizes of the upper cylinder bodies 12 are the same, and each upper piston rod 6 is installed in each upper cylinder body 12. The sizes of the lower cylinder bodies 19 are the same, and each lower piston rod 7 is installed in each lower cylinder body 19. The number of each group of upper cylinder bodies 12 and each group of lower cylinder bodies 19 is not limited to 4, that is, the number of upper piston rods 6 and lower piston rods 7 is not limited to 4.

[0049] The first oil chambers 15 are connected to each other through the first oil circuit connecting groove 36, and the second oil chambers 22 are connected to each other through the second oil circuit connecting groove 39. The upper piston rod 6 and the lower piston rod 7 are controlled separately to realize the function of raising the height of different vehicle bodies 4. When oil is pressed into the first oil inlet and outlet 16, the four upper piston rods 6 extend outward at the same time; when the oil supply is stopped, the spring pressure of the return spring 9 is transmitted to the four upper piston rods 6 through the upper support plate 8, so that the four upper piston rods 6 are retracted into the upper cylinder body 12 (A1, A2, A3 and A4). When oil is passed into the second oil inlet and outlet 23, the four lower piston rods 7 extend outward at the same time; when the oil supply is stopped, the spring pressure of the return spring 9 is transmitted to the lower piston rod 7 through the lower support plate 3, so that the four lower piston rods 7 are retracted into the lower cylinder body 19 (B1, B2, B3 and B4).

[0050] In this case, there are two ways of connecting the upper support plate 8, the shock absorber 1 and the wheel 2. Figure 1 In the embodiment, the lower support plate 3 is mounted on the shock absorber, the lower support plate 3 remains stationary, the oil cylinder assembly 5 and the upper support plate 8 are mounted on the outer surface of the cylindrical guide portion of the lower support plate 3, the shock absorber 1 is arranged on the inner side of the cylindrical guide portion, the oil cylinder assembly 5 and the upper support plate 8 are clearance-matched with the cylindrical guide portion, and the oil cylinder assembly 5 and the upper support plate 8 can slide up and down along the outer surface of the cylindrical guide portion. The return spring 9 is installed above the upper support plate 8, the first buffer 10 is connected to the shock absorber 1 by bolts, and the first buffer 10 presses the return spring 9, and the first buffer 10 is connected to the vehicle body 4, and the lower end of the shock absorber 1 is connected to the wheel 2 part.

[0051] Figure 2 In the figure, the lower end of the shock absorber 1 is connected to the wheel 2, the shock absorber and the cylinder assembly 5 are arranged in parallel, the second buffer 11 is installed above the shock absorber 1, connected together by bolts, and the second buffer 11 is further connected to the vehicle body 4.

[0052] An oil circuit connecting piece 35 is provided on the outside of the oil cylinder assembly 5, and a first oil circuit connecting groove 36 is machined between the oil circuit connecting piece 35 and the outer wall of the oil cylinder assembly 5, and a first sealing ring 18 and a second sealing ring 25 are provided to seal the first oil circuit connecting groove 36, and the oil circuits of each first oil chamber 15 are connected through the first oil circuit connecting groove 36, and then connected to the first electromagnetic reversing valve 29 through a first oil inlet and outlet 16; a second oil circuit connecting groove 39 is machined between the oil circuit connecting piece 35 and the outer wall of the oil cylinder assembly 5, and a second sealing ring 25 and a third sealing ring 38 are provided to seal the second oil circuit connecting groove 39, and the oil circuits of each second oil chamber 22 are connected through the second oil circuit connecting groove 39, and then connected to the second electromagnetic reversing valve 30 through a second oil inlet and outlet 23. The second travel switch 41 controls the extension and retraction of the upper piston rod 6 by the position of the upper support plate 8 relative to the lower support plate 3, thereby controlling the lifting height of the vehicle body 4; the first travel switch 41 controls the extension and retraction of the lower piston rod 7 by the position of the limit baffle 40 relative to the lower support plate 3, thereby controlling the lifting height of the vehicle body 4.

[0053] Under normal vehicle driving conditions, the upper piston rod 6 is in an extended state and the lower piston rod 7 is in a retracted state. When the vehicle is in or about to be in an out-of-control state, the first electromagnetic reversing valve 29 and the third electromagnetic reversing valve 31 are quickly energized, and the lower piston rod 7 is quickly retracted, thereby lowering the height of the vehicle body 4 to eliminate or reduce the occurrence of accidents. When the vehicle system detects that the vehicle itself is about to collide or is about to be collided with other vehicles, the second electromagnetic reversing valve 30 is quickly energized, the high-pressure accumulator 33 and the oil pump 27 supply oil to the second oil chamber 22, and the vehicle body 4 is quickly lifted, thereby changing the collision position of the vehicle, thereby reducing the extent of the accident. When the system monitors that the vehicle is in a completely out-of-control state, the first electromagnetic reversing valve 29, the second electromagnetic reversing valve 30 and the third electromagnetic reversing valve 31 are quickly energized, and the upper piston rod 6 and the lower piston rod 7 are quickly retracted, thereby quickly lowering the vehicle body 4, so that the vehicle body 4 can be quickly and safely controlled to prevent the accident from further expanding.

[0054] Under the premise of ensuring the comfort of the vehicle, the present invention greatly improves the vehicle's passability and broadens the vehicle's application scenarios. Compared with other body lifting systems, the reliability is greatly improved, and the procurement cost and subsequent maintenance cost are also greatly reduced. In addition, the height or posture of the vehicle body 4 can be quickly changed in an emergency situation of the vehicle, thereby reducing or eliminating the occurrence of vehicle accidents.

[0055] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A suspension system for rapidly changing vehicle height, characterized in that: The invention comprises a shock absorber (1) and a hydraulic lifting mechanism, wherein a lower support plate (3) for connecting to a vehicle axle or a wheel (2) is provided at the bottom of the shock absorber (1), the top of the shock absorber (1) is connected to a vehicle body (4), and the hydraulic lifting mechanism is arranged between the lower support plate (3) and the vehicle body (4); the hydraulic lifting mechanism comprises an oil cylinder assembly (5) and a hydraulic control system, wherein a plurality of telescopically movable upper piston rods (6) are provided at the top of the oil cylinder assembly (5), the movable ends of the upper piston rods (6) are connected to the vehicle body (4), and a plurality of telescopically movable lower piston rods (7) are provided at the bottom of the oil cylinder assembly (5), the movable ends of the lower piston rods (7) are connected to the lower support plate (3), and the hydraulic control system is used to control the telescopic movement of the upper piston rods (6) and the lower piston rods (7).

2. The suspension system for rapidly changing vehicle height according to claim 1, characterized in that: An upper support plate (8) and an elastic member are provided between the oil cylinder assembly (5) and the vehicle body (4); the upper support plate (8) is connected to the movable end of the upper piston rod (6); the two ends of the elastic member are respectively connected to the upper support plate (8) and the vehicle body (4); the elastic member is used to drive the upper piston rod (6) and the lower piston rod (7) to return to their original positions.

3. The suspension system for rapidly changing vehicle height according to claim 2, characterized in that: The elastic member comprises a return spring (9), and a first buffer member (10) is provided between the return spring (9) and the vehicle body (4).

4. The suspension system for rapidly changing vehicle height according to claim 2, characterized in that: A second buffer component (11) is provided between the shock absorber (1) and the vehicle body (4).

5. The suspension system for rapidly changing vehicle height according to claim 2, characterized in that: The lower support plate (3) comprises a plate-shaped support portion and a cylindrical guide portion, one end of the cylindrical guide portion is connected to the plate-shaped support portion, the bottom end of the lower piston rod (7) is connected to the plate-shaped support portion, the oil cylinder assembly (5) and the upper support plate (8) are both slidably arranged on the outside of the cylindrical guide portion; the shock absorber (1) is arranged on the inside of the cylindrical guide portion, or the shock absorber (1) and the cylindrical guide portion are arranged side by side.

6. The suspension system for rapidly changing vehicle height according to claim 1, characterized in that: The top of the oil cylinder assembly (5) is provided with four upper piston rods (6) evenly arranged in a ring shape, and the bottom of the oil cylinder assembly (5) is provided with four lower piston rods (7) evenly arranged in a ring shape, and the lower piston rods (7) and the upper piston rods (6) are staggered with each other.

7. The suspension system for rapidly changing vehicle height according to claim 2, characterized in that: The two ends of the oil cylinder assembly (5) are respectively provided with an upper cover plate (13) and a lower cover plate (14); the top of the oil cylinder assembly (5) is provided with an upper cylinder body (12) adapted to the upper piston rod (6); the upper cover plate (13) is provided with an upper through hole (20) adapted to the upper piston rod (6); a first oil chamber (15) is provided between the upper piston rod (6) and the lower cover plate (14); the upper cylinder body (12) is provided with a first oil inlet and outlet (16) connected to the first oil chamber (15); ) is provided with an upper sealing ring (17) on the inner wall; a lower cylinder body (19) adapted to the lower piston rod (7) is provided at the bottom of the oil cylinder assembly (5); a lower through hole (21) adapted to the lower piston rod (7) is provided on the lower cover plate (14); a second oil chamber (22) is provided between the lower piston rod (7) and the upper cover plate (13); a second oil inlet and outlet (23) communicating with the second oil chamber (22) is provided on the lower cylinder body (19); and a lower sealing ring (24) is provided on the inner wall of the lower cylinder body (19); An oil circuit connecting piece (35) is provided on the outer side of the oil cylinder assembly (5); a first oil circuit connecting groove (36) and a second oil circuit connecting groove (39) are provided between the oil circuit connecting piece (35) and the outer wall of the oil cylinder assembly (5); the first oil circuit connecting groove (36) is connected to the first oil inlet and outlet (16); the second oil circuit connecting groove (39) is connected to the second oil inlet and outlet (23); a first oil circuit interface (34) and a second oil circuit interface (37) are provided on the oil circuit connecting piece (35); the first oil circuit interface (34) is connected to the first oil circuit connecting groove (36), and the second oil circuit interface (37) is connected to the second oil circuit connecting groove (39); a first sealing ring (18), a second sealing ring (25) and a third sealing ring (38) are also provided between the oil circuit connecting member and the outer wall of the oil cylinder assembly (5), the first oil circuit connecting groove (36) is located between the first sealing ring (18) and the second sealing ring (25), and the second oil circuit connecting groove (39) is located between the second sealing ring (25) and the third sealing ring (38); The oil cylinder assembly (5) is provided with a limit baffle (40), and the limit baffle (40) is equipped with a first travel switch (41); the upper support plate (8) is equipped with a second travel switch (42).

8. The suspension system for rapidly changing vehicle height according to claim 1, characterized in that: The hydraulic control system comprises an oil tank (26), an oil pump (27), a one-way valve (28), a first electromagnetic reversing valve (29), a second electromagnetic reversing valve (30) and an oil return pipeline. One end of the oil pump (27) is connected to the oil tank (26), and the other end of the oil pump (27) is connected to the one-way valve (28). The output end of the one-way valve (28) is respectively connected to a first interface of the first electromagnetic reversing valve (29) and a first interface of the second electromagnetic reversing valve (30). The second interface of the first electromagnetic reversing valve (29) is connected to a first oil inlet pipeline, and the first oil inlet pipeline is connected to each first oil chamber (15). The second interface of the second electromagnetic reversing valve (30) is connected to a second oil inlet pipeline, and the second oil inlet pipeline is connected to each second oil chamber (22). The third interface of the first electromagnetic reversing valve (29) and the third interface of the second electromagnetic reversing valve (30) are both connected to the oil tank (26) through the oil return pipeline.

9. The suspension system for rapidly changing vehicle height according to claim 8, characterized in that: A third electromagnetic reversing valve (31) and a throttle valve (32) are provided on the oil return pipeline, and the third electromagnetic reversing valve (31) and the throttle valve (32) are connected in parallel on the oil return pipeline; the hydraulic control system also includes a high-pressure accumulator (33), the high-pressure accumulator (33) is arranged at the output end of the one-way valve (28), and the high-pressure accumulator (33) is respectively connected to the first interface of the first electromagnetic reversing valve (29) and the first interface of the second electromagnetic reversing valve (30).

10. A method for operating a suspension system for rapidly changing vehicle height as claimed in any one of claims 1 to 9, characterized in that: include: When the vehicle is in a normal driving state, the hydraulic control system controls the upper piston rod (6) to be in an extended state and the lower piston rod (7) to be in a retracted state, or the upper piston rod (6) to be in a retracted state and the lower piston rod (7) to be in an extended state; When the vehicle is in or about to be in an out-of-control state, the first electromagnetic reversing valve (29) and the third electromagnetic reversing valve (31) are energized, and the upper piston rod (6) changes from an extended state to a retracted state, or the second electromagnetic reversing valve (30) and the third electromagnetic reversing valve (31) are energized, and the lower piston rod (7) changes from an extended state to a retracted state, and the height of the vehicle body (4) is gradually lowered, thereby reducing or eliminating the occurrence of accidents; When the vehicle is about to collide or is about to be collided with another vehicle, the high-pressure accumulator (33) and the oil pump (27) supply oil to the first oil chamber (15) and the second oil chamber (22), the upper piston rod (6) and the lower piston rod (7) are both in an extended state, and the height of the vehicle body (4) is rapidly raised, thereby changing the collision position of the vehicle and reducing the severity of the accident; When the vehicle is in a completely out-of-control state, the first electromagnetic reversing valve (29), the second electromagnetic reversing valve (30) and the third electromagnetic reversing valve (31) are energized, the upper piston rod (6) and the lower piston rod (7) are rapidly retracted, and the height of the vehicle body (4) is rapidly reduced to the minimum, thereby facilitating rapid and safe control of the vehicle body (4).

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