Height stepless adjustable suspension limiting device

Abstract

The invention relates to a height stepless adjustable suspension limiting device, belongs to the technical field of automobile suspensions, and solves the problem of poor trafficability caused by over-high overall height of some existing vehicles. The suspension limiting device comprises a telescopic oil cylinder and a limiting block. The telescopic oil cylinder is fixedly mounted on the frame; the limiting block is fixedly mounted on the upper swing arm; the tail end of the telescopic oil cylinder can make contact with the limiting block, and then the maximum upward swinging angle of the suspension upper swing arm is limited. The suspension swing arm is supported and limited through the telescopic oil cylinder and the limiting block, the overall height of the suspension is adjusted by adjusting the length of the telescopic oil cylinder, then the height of the whole vehicle can be adjusted, and the trafficability of the vehicle is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile suspension, and in particular to a suspension limiting device with stepless height adjustment. Background Art

[0002] For the vehicle posture adjustable suspension system, the suspension limit device has two functions:

[0003] First, during driving, the travel of the suspension elastic element is limited by limiting the angle of the suspension swing arm, limiting the maximum load of the elastic element, and avoiding overload damage to the elastic element. The load exceeding the bearing capacity of the elastic element is borne by the limit device and transferred to the vehicle body, thereby improving the reliability of the elastic element of the vehicle suspension system and improving the driving maneuverability of the vehicle.

[0004] Secondly, when the vehicle is transported, the height of the vehicle is lowered until the suspension arm contacts the limit device, the suspension elastic element is not subjected to stress, the weight of the entire vehicle is borne by the limit device, the height of the entire vehicle is reduced to the minimum, and the vehicle's passability is improved.

[0005] The existing limit devices of height-adjustable vehicles usually adopt a fixed-height type, which can not only meet the travel limit of the suspension elastic element when the vehicle is driving, but also reduce the vehicle height to the minimum during transportation. However, for some special vehicles, the height of the whole vehicle is relatively high. If a fixed-height limit device is used, after the vehicle is lowered to the minimum during transportation, there is still a risk of excessive height. It is necessary to reduce the height of the limit device and further reduce the height of the vehicle. In addition, for different height limit requirements, the height reduction requirements of the vehicle are different, and the vehicle chassis height that is too low will also affect the driving performance. The use of a fixed-height limit device cannot take into account both usage conditions.

[0006] Therefore, it is necessary to improve the limit device to an adjustable type, which can meet the needs of vehicle driving and ensure that the height of the vehicle does not exceed the transportation limit during transportation. Summary of the invention

[0007] In view of the above analysis, the present invention aims to provide a height-steplessly adjustable suspension limit device to solve the problem of poor trafficability caused by the excessive overall height of existing vehicles.

[0008] The purpose of the present invention is mainly achieved through the following technical solutions:

[0009] A height-steplessly adjustable suspension limit device comprises: a telescopic oil cylinder and a limit block; the telescopic oil cylinder is installed on a vehicle frame at an angle downward; the limit block is fixedly installed on an upper swing arm; the end of the telescopic oil cylinder can contact the limit block, thereby limiting the maximum upward swing angle of the upper swing arm.

[0010] Furthermore, the telescopic oil cylinder comprises: a sealing end cover, an oil cylinder outer tube, a guide end cover and a piston telescopic rod; the piston telescopic rod is installed inside the oil cylinder outer tube and can slide relatively.

[0011] Furthermore, the telescopic oil cylinder drives the piston telescopic rod to slide in the outer tube of the oil cylinder through hydraulic pressure, thereby achieving the extension or shortening of the telescopic oil cylinder.

[0012] Furthermore, the sealing end cover is fixedly mounted on one end of the oil cylinder outer tube, and the guide end cover is fixedly mounted on the other end of the oil cylinder outer tube.

[0013] Furthermore, an oil filling and discharging joint is installed on the sealing end cover.

[0014] Furthermore, a displacement sensor is fixedly mounted on the inner side of the sealing end cover.

[0015] Furthermore, the displacement sensor is a photoelectric displacement sensor, which is used to monitor the displacement of the piston telescopic rod relative to the outer tube of the oil cylinder.

[0016] Furthermore, a guide through hole is provided in the middle of the guide end cover; one end of the piston telescopic rod is a piston, and the other end is a contact rod; the piston is in contact with the inner wall surface of the oil cylinder outer tube and is sealed by a sealing ring; the contact rod extends out of the oil cylinder outer tube from the guide through hole.

[0017] A height-adjustable suspension system comprises: the above-mentioned steplessly adjustable height suspension limit device, an upper swing arm, a lower swing arm and an oil-gas spring; the upper swing arm and the lower swing arm are both rotatably mounted on a vehicle frame at one end and rotatably connected to a wheel assembly at the other end; an oil-gas spring is installed between the lower swing arm and the frame.

[0018] A method for supporting a height-adjustable suspension system, using the above-mentioned height-adjustable suspension system; the method comprises:

[0019] Step S1: Fix the telescopic cylinder to the vehicle frame and install the limit block to the upper swing arm;

[0020] Step S2: When the vehicle is in driving state, the wheel assembly bounces up and down, causing the lower swing arm and the upper swing arm to swing up and down relative to the frame; at this time, the impact is buffered by the oil and gas spring;

[0021] Step S3: When the overall height of the vehicle needs to be lowered, the length of the telescopic cylinder is adjusted according to the amount of decrease in the height of the vehicle; the oil-gas spring is released, and the frame descends under the action of gravity, while the upper swing arm and the lower swing arm swing upward relative to the frame until the limit block contacts the end of the piston telescopic rod, and the frame body is supported by the telescopic cylinder and the limit block.

[0022] The technical solution of the present invention can achieve at least one of the following effects:

[0023] 1. The height-steplessly adjustable suspension limit device of the present invention can adjust the height of the end limit point thereof by adjusting the length of the telescopic cylinder. The telescopic cylinder cooperates with the limit block to support and limit the limit block at different heights.

[0024] 2. The height-adjustable suspension system of the present invention can adjust the suspension height by adopting a suspension limit device with stepless height adjustment, thereby realizing the adjustment of the overall vehicle height, adapting to different height limit requirements, improving the overall passability of the vehicle, and at the same time taking into account its driving performance and avoiding the chassis being too low as much as possible.

[0025] 3. The height-adjustable suspension system of the present invention, by adjusting the length of the steplessly height-adjustable suspension limit device, can limit the maximum upper swing angle of the upper swing arm through the telescopic cylinder when the vehicle is in driving state, thereby limiting the maximum telescopic amount of the gas spring, protecting the gas spring from damage due to excessive compression.

[0026] 4. The height-adjustable suspension system of the present invention can adjust the height of the entire vehicle to the lowest when the vehicle needs to be towed, so that it can pass through height-restricted places such as bridge holes and tunnels, thereby improving the passability of the entire vehicle in a transport state.

[0027] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0029] Figure 1 The height-steplessly adjustable suspension limiter of embodiment 1 of the present invention;

[0030] Figure 2 The retracted state of the steplessly adjustable height suspension limiter of Example 1 of the present invention;

[0031] Figure 3 The height-adjustable suspension system of embodiment 2 of the present invention;

[0032] Figure 4 The travel limit state of the height adjustable suspension system of embodiment 2 of the present invention;

[0033] Figure 5 The low position passing state of the height adjustable suspension system of embodiment 2 of the present invention;

[0034] Figure 6 The height-adjustable suspension system of embodiment 3 of the present invention;

[0035] Figure 7 A schematic diagram of the structure of a limit block assembly of a height adjustable suspension system of Embodiment 3 of the present invention;

[0036] Figure 8 This is the compressed state of the limit block assembly of Example 3 of the present invention.

[0037] Fig. 9 This is a cross-sectional effect diagram of the limit block assembly in the compressed state according to the third embodiment of the present invention;

[0038] Fig.10 It is a structural schematic diagram of a limit block body of a limit block assembly according to Embodiment 3 of the present invention;

[0039] Fig.11 This is a schematic diagram of the structural composition of the elastic support block of the limit block assembly of Example 3 of the present invention.

[0040] Reference numerals:

[0041] 1- oil charging and discharging joint; 2- sealing end cover; 3- outer cylinder of oil cylinder; 4- displacement sensor; 5- guide end cover; 6- piston telescopic rod; 7- oil and gas spring; 8- limit block; 9- upper swing arm; 10- lower swing arm; 11- wheel assembly;

[0042] 801-limiting block body; 802-spherical groove; 803-elastic support block; 804-support block slide groove; 805-spring mounting groove; 806-first air hole; 807-second air hole; 808-support spring; 803a-spherical arc surface; 803b-inner arc surface; 803c-flat side surface; 803d-outer arc surface; 803e-dorsal groove. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0044] Example 1

[0045] A specific embodiment of the present invention discloses a height-adjustable suspension limiter, such as Figure 1 , Figure 2 , Figure 3As shown, it includes: a telescopic cylinder and a limit block 8; the telescopic cylinder is installed on the frame at an angle downward; the limit block 8 is fixedly installed on the upper swing arm 9; the end of the telescopic cylinder can contact the limit block 8, thereby limiting the maximum upward swing angle of the upper swing arm 9 of the suspension.

[0046] like Figure 1 As shown, the telescopic oil cylinder comprises: a sealing end cover 2, an oil cylinder outer tube 3, a guide end cover 5 and a piston telescopic rod 6; the piston telescopic rod 6 is installed inside the oil cylinder outer tube 3 and can slide relatively.

[0047] Furthermore, the telescopic oil cylinder drives the piston telescopic rod 6 to slide in the cylinder outer tube 3 through hydraulic pressure, thereby achieving the extension or shortening of the telescopic oil cylinder.

[0048] Furthermore, the sealing end cover 2 is fixedly mounted on one end of the oil cylinder outer tube 3 , and the guide end cover 5 is fixedly mounted on the other end of the oil cylinder outer tube 3 .

[0049] Specifically, Figure 1 , Figure 2 As shown, a sealing end cover 2 is fixedly installed on the left end of the oil cylinder outer tube 3, and an oil filling and discharging joint 1 and a displacement sensor 4 are installed on the sealing end cover 2.

[0050] Specifically, the right end of the oil cylinder outer tube 3 is fixedly mounted with a guide end cover 5. The guide end cover 5 plays a guiding and limiting role for the piston telescopic rod 6.

[0051] Specifically, a sealing ring is provided on the piston of the piston telescopic rod 6 , and the piston of the piston telescopic rod 6 is installed in the oil cylinder outer tube 3 and is in sealing contact with the oil cylinder outer tube 3 through the sealing ring.

[0052] Specifically, an oil filling and discharging joint 1 is installed through the sealing end cover 2 for filling or discharging hydraulic oil into or out of the telescopic cylinder.

[0053] Specifically, a displacement sensor 4 is fixedly installed on the inner side of the sealing end cover 2. The displacement sensor 4 is a photoelectric displacement sensor, which is used to monitor the displacement of the piston telescopic rod 6 relative to the outer barrel 3 of the oil cylinder.

[0054] Furthermore, a guide through hole is provided in the middle of the guide end cover 5; one end of the piston telescopic rod 6 is a piston, and the other end is a contact rod; the piston is in contact with the inner wall surface of the cylinder outer tube 3 and is sealed by a sealing ring; the contact rod extends out of the cylinder outer tube 3 from the guide through hole.

[0055] Preferably, the piston is a cylindrical structure, and the contact rod is a rod-shaped structure with a spherical contact end.

[0056] Furthermore, the oil filling and discharging joint 1 is connected to the hydraulic control system and is used to fill or discharge oil into the telescopic cylinder. The cylinder outer tube 3, the piston telescopic rod 6, the sealing end cover 2 and the guide end cover 5 form a closed oil storage space. The position of the piston telescopic rod 6 can be adjusted by adding or discharging hydraulic oil into the oil storage space. At the same time, the extreme position of the piston telescopic rod 6 is limited by the sealing end cover 2 and the guide end cover 5.

[0057] Furthermore, the sealing end cover 2 and the piston of the piston telescopic rod 6 seal the oil in the outer cylinder tube 3, and the sealing end cover 2 can limit the shortest stroke of the piston telescopic rod 6. The contact rod of the piston telescopic rod 6 extends from the guide through hole of the guide end cover 5, and the maximum extension of the piston telescopic rod 6 is limited by the guide end cover 5.

[0058] In this embodiment, the oil filling and draining joint 1 is used to fill and drain oil into the oil cylinder to adjust the length of the limit device, and the length of the limit device is measured by the displacement sensor 4. As required, the height of the limit device can be adjusted to any specified length and locked to meet the height requirements of the limit device under different vehicles and different working conditions. The entire limit device is fixed to the vehicle body through the oil cylinder outer tube 3.

[0059] When filling with oil, the piston telescopic rod 6 extends from the guide through hole of the guide end cover 5 driven by the hydraulic oil, thereby extending the overall length of the telescopic cylinder, and finally limiting the upward swing amplitude of the upper swing arm 9 through the contact rod end of the piston telescopic rod 6.

[0060] When the oil is released, the piston telescopic rod 6 retracts into the inner part of the oil cylinder outer tube 3, and the overall length of the telescopic oil cylinder is reduced, thereby being able to expand the upward swing amplitude of the upper swing arm 9.

[0061] Furthermore, the displacement sensor 4 is used to detect the stroke of the piston telescopic rod 6, and the extended length of the piston telescopic rod 6 matches the height value required by the limit block.

[0062] Furthermore, after the suspension limit device is assembled, it can be fixed on the vehicle body by screwing or welding. The installation position and angle on the vehicle body are related to the installation position of the upper swing arm 9 of the adjustable suspension system and the limit block 8 installed on the upper swing arm 9, and it should be ensured that when the upper swing arm 9 swings upward, the limit block 8 and the end of the piston telescopic rod 6 can just touch each other.

[0063] The height-adjustable suspension limiter of the present invention is used to solve the problem of height overlimit in the existing vehicle transportation process. The present invention can adjust the limit height of the limit block 8 and the upper swing arm 9 by adjusting the extension or retraction of the piston telescopic rod 6 of the telescopic oil cylinder.

[0064] The limit device of the present invention has a simple structure, is easy to install, has fast adjustment, works reliably and has strong environmental adaptability. The limit device has stepless adjustable height and can be applied to limit positions in different working states of suspension devices of different vehicles, and can also be extended to other mechanisms requiring limit positions.

[0065] The suspension limit device of the present invention only needs to release oil from the telescopic cylinder of the limit device during vehicle transportation. Under the action of the vehicle weight, the telescopic cylinder is automatically pressed back to the specified length by the limit block 8 on the upper swing arm 9, so that the overall height of the vehicle is reduced and the vehicle is in a transportation limit state. When the vehicle is traveling, the telescopic cylinder of the suspension limit device is filled with oil, and the piston telescopic rod 6 is extended to the specified length, which is in a driving limit state. The maximum extension amount of the oil and gas spring 7 can be limited to protect the oil and gas spring 7 from overload damage. The limit height of the suspension limit device of the present invention is detected by the displacement sensor 4. The limit height can be infinitely adjusted by only changing the extension length of the piston telescopic rod 6. It can be used on different types of vehicles, and the adjustment is convenient and quick.

[0066] Example 2

[0067] A height-adjustable suspension system, such as Figure 3 , Figure 4 , Figure 5 As shown, it includes: the height-steplessly adjustable suspension limit device of Example 1, an upper swing arm 9, a lower swing arm 10 and a gas spring 7; the upper swing arm 9 and the lower swing arm 10 are both rotatably mounted on the vehicle frame at one end, and the other end is rotatably connected to the wheel assembly 11; the gas spring 7 is installed between the lower swing arm 10 and the frame.

[0068] The adjustable suspension system adopted in the present invention is a double swing arm oil-gas suspension, and the elastic element adopts an oil-gas spring 7. The double swing arm includes an upper swing arm 9 and a lower swing arm 10, and a limit block 8 is screwed on the upper swing arm 9. One end of the upper swing arm 9 and the lower swing arm 10 is fixed to the vehicle body through a hinge, and the other end is connected to the wheel assembly 11 through a ball hinge.

[0069] like Figure 3 As shown, the limit block 8 is fixed on the upper swing arm 9. One end of the upper swing arm 9 and the lower swing arm 10 are both mounted on the vehicle body through hinges, and the other ends are connected to the wheel assembly 11 through ball hinges.

[0070] Specifically, the lower end of the oil-gas spring 7 is hingedly fixed to the lower swing arm 10 through a pin, and the upper end is hingedly fixed to the frame through a pin.

[0071] Specifically, the welding position of the telescopic oil cylinder of the height-adjustable suspension limit device on the vehicle frame matches the position of the limit block 8 on the upper swing arm 9. When the upper swing arm 9 swings upward to a certain angle, the limit block 8 collides with the piston telescopic rod 6 of the telescopic oil cylinder.

[0072] Furthermore, in order to match the change in the end position of the piston telescopic rod 6 of the telescopic cylinder, the length of the limit block 8 is set to ensure that it can always contact the limit block 8 on the upper swing arm 9 during the extension and retraction process of the piston telescopic rod 6.

[0073] Furthermore, a damping valve is integrated inside the oil-gas spring 7 to attenuate the vibration of the vehicle.

[0074] The suspension limit device is fixedly installed on the vehicle body according to the set position. With the help of the hydraulic control oil circuit of the adjustable suspension system, oil is filled into the telescopic cylinder through the oil filling and discharging joint 1. The piston telescopic rod 6 can be extended to any position and locked. The extended length of the piston telescopic rod 6 is detected by the displacement sensor 4; when the length of the telescopic cylinder needs to be shortened, the telescopic cylinder is drained, and under the action of the vehicle weight, the upper swing arm 9 acts on the piston telescopic rod 6 to shorten it to the specified position and lock it, thereby realizing stepless adjustment of the height of the limit device.

[0075] Furthermore, each wheel of the vehicle is installed with a height-adjustable suspension system of this embodiment, and the entire vehicle forms a set of adjustable suspension system.

[0076] Specifically, the height-adjustable suspension system of this embodiment has at least the following two working modes:

[0077] 1. When the vehicle is in driving state: the uneven road surface causes the wheel assembly 11 to jump up and down, the upper swing arm 9 and the lower swing arm 10 to swing up and down, and the oil-gas spring 7 shortens or lengthens to buffer the impact of the road surface. When the upper swing arm 9 jumps up to the limit block 8 on the upper swing arm 9 and the contact rod of the piston telescopic rod 6 of the telescopic oil cylinder, the suspension limit device plays a role in limiting the upper swing arm 9, the upper swing arm 9 no longer swings upward, and the oil-gas spring 7 no longer shortens, limiting the maximum force of the oil-gas spring 7.

[0078] 2. When the vehicle is in the transport state: the vehicle is placed on the transport flatbed. Under the action of the hydraulic control system, the oil-gas spring 7 and the telescopic cylinder are in the oil-draining state. Under the action of the vehicle weight, the hydraulic oil of the oil-gas spring 7 returns to the oil tank, the vehicle height drops, the upper swing arm 9 and the lower swing arm 10 swing upward, and the oil-gas spring 7 shortens. When the limit block 8 on the upper swing arm 9 contacts the end of the piston telescopic rod 6, the oil in the telescopic cylinder is hydraulically returned to the oil tank, and the length of the telescopic cylinder is shortened; when the telescopic cylinder is shortened to the shortest position, it is in the transport limit state; the vehicle height drops to the minimum, and the weight of the whole vehicle is transferred to the limit block 8, the upper swing arm 9, the lower swing arm 10 and the wheel assembly 11 through the telescopic cylinder. The whole vehicle is supported by the suspension limit device, and the oil-gas spring 7 is no longer under force.

[0079] When the vehicle needs to be switched to the driving state after being towed to the destination, the hydraulic control system fills oil into the oil-gas spring 7 and the telescopic cylinder, the oil-gas spring 7 extends, the elastic force of the oil-gas spring 7 acts on the lower swing arm 10, the upper swing arm 9 and the lower swing arm 10 swing downward synchronously, the vehicle is raised to the ground clearance state, and the telescopic cylinder extends to the specified height and is in the driving limit state. The telescopic stroke of the oil-gas spring 7 can be limited by the telescopic cylinder and the limit block 8.

[0080] In this embodiment, when the vehicle is stationary, the load is transferred to the oil-gas spring 7 through the wheel assembly 11, and the oil-gas spring 7 bears the weight of the whole vehicle. During the driving process of the vehicle, in addition to bearing the weight of the whole vehicle, the oil-gas spring 7 also bears the impact load from the road surface. The impact load of the road surface is transmitted to the wheel assembly 11 and transmitted to the oil-gas spring 7 through the lower swing arm 10. The greater the impact load, the greater the stroke of the wheel jumping up and down. The impact load is buffered and attenuated by the oil-gas spring 7 to reduce the vibration of the vehicle. When the wheel bounces, it drives the upper swing arm 9 and the lower swing arm 10 to swing along the pin fixed on the vehicle body. In order to protect the oil-gas spring 7 from overtravel and overload, the upper swing arm 9 swings until the limit block 8 of the upper swing arm 9 collides with the end of the piston telescopic rod 6 of the telescopic oil cylinder welded on the vehicle body, limiting the stroke of the oil-gas spring to avoid overload damage.

[0081] The suspension limit device of the present invention should be vented after the first use or maintenance to ensure that the oil cylinder is in a rigid limit state when the vehicle is in a travel limit state. Otherwise, there is gas in the oil cylinder and it is in an elastic state. When the upper swing arm swings to the limit angle, it can further swing upward, and the stroke of the oil and gas spring 7 is further shortened, which may cause over-travel damage or overload damage to the oil and gas spring 7. Similarly, when the suspension limit device is in the travel limit state, the oil seal in the oil cylinder is reliably locked to avoid oil leakage causing the length of the limit device oil cylinder to be insufficient, causing over-travel damage or overload damage to the oil and gas spring 7.

[0082] Example 3

[0083] In a specific embodiment of the present invention, the suspension limiting device in Embodiment 1 or Embodiment 2 is improved:

[0084] like Figure 6 , Figure 7 , Figure 8 As shown, the telescopic cylinder shown is an arc-shaped hydraulic cylinder.

[0085] Specifically, the difference between the arc-shaped hydraulic cylinder in this embodiment and the telescopic cylinder in Embodiment 1 is that the cylinder outer tube 3 and the piston telescopic rod 6 of the arc-shaped hydraulic cylinder are both arc-shaped structures.

[0086] Specifically, Figure 6 As shown, the outer cylinder tube 3 is an arc-shaped sleeve, and the piston telescopic rod 6 is an arc-shaped plunger.

[0087] Specifically, Figure 6 As shown, the central axis arc of the oil cylinder outer tube 3 coincides with the central axis arc of the piston telescopic rod 6, and the outer surface of the piston of the piston telescopic rod 6 fits the inner wall surface of the oil cylinder outer tube 3 and is in sealed contact through a sealing ring. Furthermore, the piston telescopic rod 6 in this embodiment can slide along the extension direction of the central axis arc of the oil cylinder outer tube 3 under the drive of the hydraulic oil, so as to realize the arc-shaped extension and contraction of the arc-shaped hydraulic cylinder along the central axis arc.

[0088] Furthermore, during installation and assembly, the center of the arc of the central axis of the arc-shaped hydraulic cylinder coincides with the axis of the hinge shaft of the upper swing arm 9 and the frame body. Correspondingly, the distance between the center of the limit block 8 and the axis of the hinge shaft of the upper swing arm 9 is set to be equal to the arc radius of the arc of the central axis of the arc-shaped hydraulic cylinder.

[0089] When the upper swing arm 9 swings upward around the hinge axis connected to the frame body, the limit block 8 also swings upward in an arc shape, and the swing arc of the limit block 8 and the arc of the central axis of the arc hydraulic cylinder are concentric arcs of equal diameter. In other words, the movement trajectory of the limit block 8 moving upward driven by the upper swing arm 9 coincides with the movement trajectory of the spherical contact end of the piston telescopic rod 6 during the telescopic movement of the arc hydraulic cylinder.

[0090] During implementation, the piston telescopic rod 6 is extended or shortened in an arc shape along the central axis of the arc-shaped hydraulic cylinder, the limit block 8 swings upward with the intersection axis of the upper swing arm 9 and the vehicle body as the rotation axis, and the end of the piston telescopic rod 6 can always contact the upper end surface of the limit block 8.

[0091] Preferably, when the height of the vehicle is adjusted, the telescopic cylinder and the limit block 8 will have rigid contact, and the impact caused by the rigid contact will be transmitted to the components, driver and sensitive instruments inside the vehicle body. Therefore, on the premise of achieving height adjustment of the suspension system, in order to improve driving comfort and protect the instruments inside the vehicle body, it is necessary to reduce the negative impact caused by the rigid impact between the limit block 8 and the telescopic cylinder.

[0092] In this embodiment, the specific structure of the limit block 8 is designed to be a limit block component with elastic buffering function.

[0093] like Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, the limit block assembly includes: a limit block body 801, an elastic support block 803 and an elastic structure.

[0094] Specifically, Figure 7 , Figure 8 , Fig. 9As shown, the upper end surface of the limit block body 801 is provided with a spherical groove 802 . When the spherical contact end of the piston telescopic rod 6 contacts the limit block body 801 , the spherical contact end can be inserted into the spherical groove 802 on the limit block body 801 .

[0095] Furthermore, the upper end surface of the limit block body 801 is also provided with a plurality of support block grooves 804 extending downward, the elastic support block 803 is slidably installed in the support block grooves 804, and the upper surface of the elastic support block 803 is an arc surface; specifically, when the elastic support block 803 is pressed into the support block groove 804 under the pressure of the piston telescopic rod 6, its upper end arc surface coincides with the spherical groove 802 of the limit block body 801.

[0096] Furthermore, an elastic structure is provided between the limiting block body 801 and the elastic supporting block 803 .

[0097] Specifically, the elastic structure is a support spring 808; a spring mounting groove 805 is provided on the bottom surface of the support block slide groove 804, the support spring 808 is installed in the spring mounting groove 805, and the upper end of the support spring 808 is connected to the lower end of the elastic support block 803.

[0098] In a specific implementation of this embodiment, a plurality of elastic support blocks 803 are distributed in an array around the central circumference of the limiting block body 801 .

[0099] Specifically, Fig.10 As shown, the elastic support block 803 includes: a spherical arc surface 803a (upper end surface), a lower end surface, an inner arc surface 803b, two flat side surfaces 803c on both sides and an outer arc surface 803d.

[0100] Correspondingly, the spherical arc surface 803a of the elastic support block 803 and the spherical groove 802 of the limiting block body 801 are spherical surfaces with equal diameters.

[0101] Specifically, the inner arc surface 803b and the outer arc surface 803d of the elastic support block 803 are respectively fitted with the arc surfaces on the front and rear sides of the support block slide groove 804; the two flat side surfaces 803c of the elastic support block 803 are respectively fitted with the two side surfaces of the support block slide groove 804.

[0102] Specifically, both side surfaces of the support block slide groove 804 are arranged along the radial direction of the fan groove 802 .

[0103] Furthermore, in order to achieve smooth displacement of the elastic support block 803 in the support block slide groove 804, in this embodiment, a first air hole 806 and a second air hole 807 are provided on the side of the limit block body 801; specifically, the first air hole 806 and the second air hole 807 are stepped through holes connected to each other, and the diameter of the first air hole 806 is larger than that of the second air hole 807.

[0104] Furthermore, one end of the first air hole 806 is connected to the support block slide groove 804, and the other end is connected to the second air hole 807; one end of the second air hole 807 is connected to the first air hole 806, and the other end is connected to the external space.

[0105] When the elastic support block 803 moves downward under the pressure of the piston support rod 6, the air inside the support block slide groove 804 is compressed, and the gas is discharged from the first air hole 806 and the second air hole 807. In this embodiment, the diameter of the second air hole 807 is smaller than that of the first air hole 806 to prevent external debris from entering the interior of the support block slide groove 804 and avoid affecting the upward and downward sliding of the elastic support block 803.

[0106] Furthermore, in order to avoid the clogging of the air hole when the elastic support block 803 moves downward, in this embodiment, a back groove 803e is set on the outer curved surface 803d of the elastic support block 803; when the elastic support block 803 is compressed into the support block slide groove 804, the back groove 803e is used to ensure that the internal space of the support block slide groove 804 remains connected with the first air hole 806.

[0107] In this embodiment, by providing a plurality of circumferentially distributed elastic support blocks 803, when the limit block assembly contacts the telescopic oil cylinder, the elastic support blocks 803 can firstly buffer the rigid impact, and then support and limit the spherical grooves 802, so as to avoid the rigid impact affecting the installation stability of the suspension limit device.

[0108] In this embodiment, by setting multiple groups of support springs 808 and elastic support blocks 803, in the limited driving state, the elastic support block 803 can be used for elastic support first. At this time, the elastic support block 803 and the oil-gas spring 7 can synchronously buffer the up and down bounce of the wheel assembly 11, reducing the impact load on the oil-gas spring 7. When the upper swing arm 9 swings to the maximum amplitude, the piston telescopic rod 6 of the telescopic oil cylinder can rigidly contact the spherical groove 802 of the limit block assembly, directly limiting the upward swing of the upper swing arm 9. That is to say, in this embodiment, the limit protection of the oil-gas spring 7 is divided into two stages, the first stage is the elastic limit stage in which the elastic support block 803 provides buffering support; the second stage is the rigid limit stage in which the spherical groove 802 of the limit block body 801 is in rigid contact with the telescopic oil cylinder. In this embodiment, by setting the staged limit, the road impact can be buffered in the vehicle driving limit state and the vehicle transportation state, thereby protecting the internal instruments of the vehicle and improving the driving experience.

[0109] In this embodiment, by setting the central axis arc of the telescopic cylinder to coincide with the motion trajectory of the limit block 8 / limit block assembly, it is ensured that the spherical end of the piston telescopic rod 6 can always be engaged with the spherical groove 802 of the limit block body 801, and the two can form a ball-joint structure after engagement, thereby achieving a stable and reliable limit state and smoothness when the limit is released.

[0110] Example 4

[0111] A specific embodiment of the present invention provides a method for supporting a height-adjustable suspension system, using the height-adjustable suspension system of Embodiment 2 or Embodiment 3; the supporting method comprises:

[0112] Step S1: Fix the telescopic cylinder to the frame body, and install the limit block 8 to the upper swing arm 9;

[0113] Step S2: When the vehicle is in driving state, the up and down bouncing of the wheel assembly 11 causes the lower swing arm 10 and the upper swing arm 9 to swing up and down relative to the frame body; at this time, the impact is buffered by the oil and gas spring 7;

[0114] Step S3: When the overall height of the vehicle needs to be lowered, the length of the telescopic cylinder is adjusted according to the amount of decrease in the height of the vehicle; the oil-gas spring 7 releases oil, and the frame body moves downward under the action of gravity. At the same time, the upper swing arm 9 and the lower swing arm 10 swing upward relative to the frame body until the limit block 8 contacts the end of the piston telescopic rod 6 of the telescopic cylinder, and the frame body is supported by the telescopic cylinder and the limit block 8.

[0115] In step S1, when installing the telescopic cylinder and the stop block 8, it is ensured that the piston telescopic rod 6 of the telescopic cylinder can contact the stop block 8 when extending or shortening. Specifically, when the telescopic cylinder is an arc-shaped hydraulic cylinder, after installation, the upper swing arm 9 swings to drive the upward movement trajectory of the stop block 8 to coincide with the arc where the arc line of the central axis of the arc-shaped hydraulic cylinder is located.

[0116] In step S2, when the vehicle is in the driving condition, the piston telescopic rod 6 of the telescopic oil cylinder is extended to limit the swing amplitude of the limit block 8 and the upper swing arm 9, such as Figure 2 , Figure 3 shown.

[0117] Specifically, in step S2, during the vehicle driving process:

[0118] Step S21: The impact load from the road surface is transmitted to the lower arm 10 and the upper arm 9 of the suspension through the wheel assembly 11. The up and down bounce of the wheel assembly 11 causes the lower arm 10 and the upper arm 9 to swing up and down. Specifically, the greater the undulation of the road surface and the faster the vehicle speed, the greater the impact load on the wheel assembly 11 and the greater the swing angle of the upper arm 9 and the lower arm 10.

[0119] Step S22: The lower swing arm 10 transfers the load to the oil-gas spring 7, causing the oil-gas spring 7 to shorten or lengthen; the larger the swing angle of the lower swing arm 10, the greater the stroke change of the oil-gas spring 7, and the greater the amplitude of the load change on the oil-gas spring 7; the upper swing arm 9 swings synchronously with the lower swing arm 10, and the swing amplitude of the upper swing arm 9 is the same as the swing amplitude of the lower swing arm 10.

[0120] Step S23: When the limit block 8 on the upper swing arm 9 and the piston telescopic rod 6 of the telescopic oil cylinder have a rigid collision, the swing angle of the upper swing arm 9 no longer increases, thereby limiting the shortening range of the oil-gas spring 7 and the load it bears to reach the maximum value. Specifically, part of the load that exceeds the bearing capacity of the oil-gas spring 7 is directly transmitted to the vehicle body through the limit block 8 and the telescopic oil cylinder, which can protect the oil-gas spring 7 from overload damage.

[0121] In step S3, when the vehicle is in a limited driving state and a transport state, the height of the entire vehicle needs to be lowered; when the vehicle needs to travel in a limited height state (for example, passing through a bridge hole, tunnel, etc.), the height of the vehicle needs to be lowered according to the height limit requirement, and the vehicle is in a limited driving state; when the vehicle is towed, the vehicle needs to be adjusted to the transport state, and the height of the entire vehicle is lowered to the minimum in the transport state.

[0122] Specifically, for rail transport, when the height exceeds a certain limit, it can only be transported at a low speed, and when the height exceeds the maximum limit, it cannot be towed; for road transport, when the height exceeds the height limit, it cannot be towed.

[0123] In step S3, the vehicle height is lowered by:

[0124] Step S31: Turn on the oil circuit locking switch of the hydraulic control system, and the oil charging and discharging joint 1 of the telescopic oil cylinder and the oil-gas spring 7 are both in the oil discharging state;

[0125] Step S32: Under the action of the vehicle body's own weight, the oil in the oil-gas spring 7 flows back to the oil tank, and the oil-gas spring 7 shortens; at the same time, the upper swing arm 9 and the lower swing arm 10 rotate upward around the hinge axis on the frame body, and the vehicle height is reduced.

[0126] Step S33: When the height of the vehicle is lowered to the point where the limit block 8 on the upper swing arm 9 collides with the end of the piston telescopic rod 6 of the telescopic cylinder, the oil in the telescopic cylinder is pressed back into the oil tank, and the piston telescopic rod 6 is partially retracted into the cylinder outer tube 3; at this time, the vehicle is in a limited driving state.

[0127] Specifically, Figure 4 As shown in FIG. 1 , when the telescopic cylinder is in the limited driving state, after the oil-gas spring 7 releases oil, the vehicle height drops to the point where the limit block 8 rigidly collides with the end of the piston telescopic rod 6. At this time, the ground clearance of the vehicle is h2, and the height of the whole vehicle is H 2 .

[0128] Specifically, in the limited driving state, the oil release amount of the gas spring 7 and the telescopic cylinder determines the length of the gas spring 7 and the telescopic cylinder, and then determines the lowering height of the whole vehicle; the lowering height of the whole vehicle is determined according to the height limit requirement.

[0129] Step S34: the oil-gas spring 7 and the telescopic cylinder continue to release oil, and the height of the vehicle continues to decrease; when the piston telescopic rod 6 is shortened to contact with the sealing end cover 2, the telescopic cylinder is in the shortest state, and the oil stored in the oil-gas spring 7 is all discharged to the oil tank, and the height of the vehicle drops to the lowest; at this time, the vehicle is in a transport limit state, and the weight of the whole vehicle is no longer borne by the oil-gas spring 7, but is transmitted to the wheel assembly 11 by the telescopic cylinder, the limit block 8 / limit block assembly, the upper swing arm 9, and the lower swing arm 10.

[0130] In step S34, when the vehicle is transported, the vehicle is towed by road or rail. Due to the height restrictions of culverts, bridges, etc., the height of the transported vehicle is not allowed to exceed the limit requirements. Specifically, Figure 5 As shown, in step S34, when the telescopic cylinder is in the transport limit state, the length of the telescopic cylinder is in the shortest state, at which time the ground clearance of the vehicle is h3 and the height of the whole vehicle is H3.

[0131] contrast Figure 4 and Figure 5 status, Figure 4 In the limited driving state, the height of the vehicle is lowered to meet the height limit requirements during vehicle driving. The height of the vehicle is H2; Figure 5 After the transport limit state is adopted, the height of the whole vehicle drops to the lowest, which is H3; that is, h2>h3, H2>H3. For special vehicles with extra-high height, after the height adjustable limit device is adopted, the height of the whole vehicle is significantly reduced, which can improve the transportation performance and passing performance of the vehicle.

[0132] Furthermore, when the vehicle is transported to the destination and needs to be switched to the driving state, the hydraulic control system is operated to fill the telescopic cylinder and the oil-gas spring 7 with oil. After the oil-gas spring 7 is filled with oil, its elastic force drives the lower swing arm 10 to swing downward, and the upper swing arm 9 rotates synchronously with the lower swing arm 10, and then the upper swing arm 9 and the lower swing arm 10 transmit the force to the ground through the wheel assembly 11 to lift the vehicle; at the same time, the oil enters the telescopic cylinder through the oil filling and discharging joint 1, and the piston telescopic rod 6 extends, and the vehicle is in the driving state. At this time, the ground clearance of the vehicle is the normal driving height h1, and the height of the whole vehicle is H1, which meets the needs of normal driving of the vehicle, and the suspension limit device can limit the oil-gas spring 7. Protection.

[0133] Compared with the prior art, the technical solution provided by this embodiment has at least one of the following beneficial effects:

[0134] 1. The height-steplessly adjustable suspension limiter of the present invention has a simple structure, is easy to install, is convenient and quick to adjust, works reliably and has strong environmental adaptability. It is suitable for limiting the suspension devices of different vehicles and working conditions, and can also be extended to devices in other mechanisms that require adjustable limits.

[0135] 2. The suspension limit device provided by the present invention can realize stepless adjustment of the height of the limit device. When the vehicle is driving normally, the suspension limit device prevents the oil and gas spring from overtravel and overload damage when working. When the vehicle is driving with limited position, the suspension limit device can limit the height of the vehicle and bear the load of the whole vehicle together with the oil and gas spring 7, which can improve the reliability and driving maneuverability of the vehicle's adjustable suspension system; when the vehicle is transported with limited position, the ground clearance of the whole vehicle during transportation can be further reduced, which can effectively reduce the height of the whole vehicle, improve the ability of the vehicle to pass through culverts and bridges, and improve the passability of the vehicle during road or rail transportation.

[0136] 3. The position limiting device of the present invention adopts a small oil cylinder type, and can meet different position limiting height requirements by hydraulically driving the extension or retraction of the piston telescopic rod 6.

[0137] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A height-adjustable suspension limiter, characterized in that: include: A telescopic oil cylinder and a limit block (8); the telescopic oil cylinder is installed on the vehicle frame in an inclined downward direction; the limit block (8) is fixedly installed on the upper swing arm (9); the end of the telescopic oil cylinder can contact the limit block (8), thereby limiting the maximum angle of the upper swing arm (9) to swing upward.

2. The height-adjustable suspension limiter according to claim 1, characterized in that: The telescopic oil cylinder comprises: a sealing end cover (2), an oil cylinder outer tube (3), a guide end cover (5) and a piston telescopic rod (6); the piston telescopic rod (6) is installed inside the oil cylinder outer tube (3) and can slide relatively.

3. The height-adjustable suspension limiter according to claim 2, characterized in that: The telescopic oil cylinder drives the piston telescopic rod (6) to slide in the oil cylinder outer tube (3) through hydraulic pressure, thereby achieving the extension or contraction of the telescopic oil cylinder.

4. The height-adjustable suspension limiter according to claim 3, characterized in that: The sealing end cover (2) is fixedly mounted on one end of the oil cylinder outer tube (3), and the guide end cover (5) is fixedly mounted on the other end of the oil cylinder outer tube (3).

5. The height-adjustable suspension limiter according to claim 4, characterized in that: An oil filling and discharging joint (1) is installed on the sealing end cover (2).

6. The height-adjustable suspension limiter according to claim 5, characterized in that: A displacement sensor (4) is fixedly mounted on the inner side of the sealing end cover (2).

7. The height-adjustable suspension limiter according to claim 6, characterized in that: The displacement sensor (4) is a photoelectric displacement sensor, which is used to monitor the displacement of the piston telescopic rod (6) relative to the oil cylinder outer tube (3).

8. The height-adjustable suspension limiter according to any one of claims 2 to 7, characterized in that: A guide through hole is provided in the middle of the guide end cover (5); one end of the piston telescopic rod (6) is a piston, and the other end is a contact rod; the piston is in contact with the inner wall surface of the oil cylinder outer tube (3) and is in sealing contact with the inner wall surface of the oil cylinder outer tube (3) through a sealing ring; the contact rod extends out of the oil cylinder outer tube (3) through the guide through hole.

9. A height-adjustable suspension system, characterized in that: include: The steplessly height-adjustable suspension limiter, upper swing arm (9), lower swing arm (10) and oil-gas spring (7) as described in any one of claims 1 to 8; the upper swing arm (9) and the lower swing arm (10) are both rotatably mounted on the vehicle frame at one end and rotatably connected to the wheel assembly (11) at the other end; an oil-gas spring (7) is installed between the lower swing arm (10) and the frame.

10. A method for supporting a height-adjustable suspension system, characterized in that: The height-adjustable suspension system of claim 9 is adopted; the supporting method comprises: Step S1: fix the telescopic cylinder to the vehicle frame, and install the limit block (8) to the upper swing arm (9); Step S2: When the vehicle is in a driving state, the up and down bouncing of the wheel assembly (11) causes the lower swing arm (10) and the upper swing arm (9) to swing up and down relative to the vehicle frame body; at this time, the impact is buffered by the oil and gas spring (7); Step S3: When the overall height of the vehicle needs to be lowered, the length of the telescopic cylinder is adjusted according to the amount of height reduction of the vehicle; the oil-gas spring (7) is released, and the frame descends under the action of gravity, while the upper swing arm (9) and the lower swing arm (10) swing upward relative to the frame until the limit block (8) contacts the end of the piston telescopic rod (6), and the vehicle is supported by the telescopic cylinder and the limit block (8).

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