Hydro-pneumatic spring suspension assembly of linear motor

Abstract

The invention discloses a linear motor hydro-pneumatic spring suspension assembly which comprises a linear motor and a shock absorber arranged in the linear motor, the shock absorber is sequentially provided with a liftable piston rod, a working cylinder inner barrel and a working cylinder outer barrel from inside to outside, and a piston arranged at the lower end of the piston rod divides an inner cavity of the working cylinder inner barrel into a rod cavity and a rodless cavity. A stator assembly of the linear motor is arranged on a motor shell, a rotor assembly of the linear motor is arranged on a working cylinder outer barrel of the shock absorber, a piston rod is driven to ascend and descend through electromagnetic coupling of the stator assembly and the rotor assembly, and an integrated switch valve is fixed outside a first oil port formed in the working cylinder outer barrel. The valve block is fixed to the working cylinder outer barrel, the valve element is movably arranged in the valve block and the valve sleeve, the electromagnetic coil is arranged outside the valve element in a sleeving mode, and movement of the valve element is controlled through the electromagnetic coil so as to control connection and disconnection of the first oil port. The integrated design of the linear motor and the shock absorber and the electromagnetic valve and the valve block can reduce pipelines, and is compact in structure, high in response speed and free of leakage risk.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a linear motor-pneumatic spring suspension assembly. Background Technology

[0002] The linear motor-pneumatic spring suspension assembly is an intelligent suspension system integrating electric drive active control, hydraulic damping, and pneumatic spring characteristics. It achieves high-response, high-precision, and low-energy-consumption vehicle posture control by directly driving hydraulic cylinders and pneumatic springs through a linear motor. Traditional hydraulic linear motor-pneumatic spring suspension assemblies have the following problems: (1) It consists of components such as hydraulic pump, oil tank, pipeline, valve group, and shock absorber. The components are numerous, relatively scattered, occupy a large space, and have insufficient integration, which greatly increases the complexity of installation. (2) The pipeline is long and the oil is poorly compressible, and the valve group throttling delay will result in a relatively slow system response speed and obvious lag. (3) The increase in hydraulic pipelines and components makes the hydraulic linear motor air spring suspension assembly more dependent on seals, which poses a risk of pipeline leakage and requires frequent maintenance. Summary of the Invention

[0003] In response to the shortcomings of existing linear motor-pneumatic spring suspension assemblies, such as insufficient integration, numerous components, complex installation, slow response speed, and poor sealing, the applicant provides a linear motor-pneumatic spring suspension assembly with a reasonable structure. Through the integrated design of the linear motor and shock absorber, and the solenoid valve and valve block, the pipeline is reduced, eliminating the need for complex hydraulic pipelines, pumps, valve groups, pipelines, etc., resulting in a compact structure, fast response speed, no leakage risk, and avoiding sealing failure problems.

[0004] The technical solution adopted in this invention and the beneficial effects achieved are as follows: The linear motor oil gas spring suspension assembly comprises a linear motor and a shock absorber arranged in the linear motor, the shock absorber is sequentially provided with a liftable piston rod, a working cylinder inner cylinder and a working cylinder outer cylinder from inside to outside, the upper end and the lower end of the working cylinder outer cylinder and the working cylinder inner cylinder are connected through a guide and a bottom valve respectively, an outer working cavity is arranged between the working cylinder outer cylinder and the working cylinder inner cylinder, a piston is arranged at the lower end of the piston rod, the piston divides the inner cavity of the working cylinder inner cylinder into a rod cavity and a rodless cavity, a stator assembly of the linear motor is arranged on a motor shell, a rotor assembly is arranged on the working cylinder outer cylinder of the shock absorber, the lifting of the piston rod is driven through the electromagnetic coupling of the stator assembly and the rotor assembly, so that the oil in the rod cavity and the rodless cavity is controlled to be pumped or sucked, a plurality of first oil ports are arranged on the outer periphery of the working cylinder outer cylinder, the first oil ports are communicated with the outer working cavity, and an integrated on-off valve is arranged outside the first oil ports, the integrated on-off valve has a valve block fixed with the working cylinder outer cylinder, a valve core movably arranged in the valve block and a valve sleeve, and an electromagnetic coil arranged outside the valve core, the movement of the valve core is controlled through the electromagnetic coil, so that the on-off of the hydraulic oil path at the first oil port is controlled.

[0005] As a further improvement of the above technical solution: The valve block is provided with a through second oil port, the second oil port is communicated with the first oil port, the valve core is provided with a plurality of third oil ports in the circumferential direction and a fourth oil port at one end, the fourth oil port is communicated with the second oil port, the on-off of the third oil port and the second oil port is realized by controlling the movement of the valve core, so that the on-off of the hydraulic oil path at the first oil port is controlled.

[0006] The integrated on-off valve further has a protection shell arranged at one side of the valve block, and a current interface is arranged on the protection shell.

[0007] The linear motor oil gas spring suspension assembly has high degree, the shock absorber is used as a pump and an actuator, the integrated design of the linear motor and the shock absorber and the electromagnetic valve and the valve block reduces the arrangement of pipelines and components, the system responds faster, the leakage risk is small, the installation, arrangement and maintenance are convenient, the problem of static locking of the linear motor is solved, the oil gas spring has the non-linear stiffness characteristic, can efficiently filter the high-frequency vibration of the road surface, the linear motor as the active adjusting unit communicated with the shock absorber can correct the response deviation of the oil gas spring in real time, the coupling point of the linear motor and the hydraulic system can realize active height adjustment and passive height adjustment, and can realize height adjustment and height maintenance.

[0008] A plurality of oil paths are arranged on the guide, the two ends of each oil path are communicated with the outer working cavity and the rod cavity respectively, and a damping valve is arranged on each oil path, and the damping valve can flow in both directions. The guide is provided with a bidirectional damping valve, the oil liquid in and out of the rod cavity is controlled, the oil liquid compensation channel can be cancelled, and the structure is further compact.

[0009] The upper end of the piston rod is connected with the vehicle body through a connecting device.

[0010] The connecting device comprises two connecting sleeves sleeved on the outer periphery of the piston rod, a flange plate arranged between the two connecting sleeves, and two gaskets arranged at the upper and lower ends of the two connecting sleeves, the connecting sleeves, the flange plate and the gaskets are fixed by fasteners, and a plurality of fasteners are arranged on the flange plate in the circumferential direction.

[0011] The outer periphery of the piston rod between the guide and the piston is provided with a limiting ring.

[0012] The bottom valve can be bidirectional, and the bottom valve is installed on the base, and the base is connected with the wheel.

[0013] The outer periphery of the piston rod is sleeved with an oil seal, and the outer periphery and the inner wall of the upper end of the outer cylinder of the working cylinder are provided with matched threads, and the piston rod is threadedly connected with the outer cylinder of the working cylinder through the oil seal.

[0014] A buffer limiting block is arranged between the upper end of the motor shell and the piston rod.

[0015] Through the reasonable and convenient-to-install connecting device structure, the base and the oil seal, stable connection of the piston rod and the vehicle body, the linear motor oil gas spring suspension assembly and the tire, and the piston rod and the working cylinder outer cylinder can be realized; the limiting ring rises simultaneously with the piston rod, and when the limiting ring contacts the guide, the piston reaches the maximum displacement at this time, and the piston overstroke can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present application.

[0017] Figure 2 It is Figure 1 An enlarged view of the middle A part.

[0018] Figure 3 It is Figure 1 An enlarged view of the middle B part.

[0019] Figure 4 It is a structural schematic diagram of the integrated switch valve.

[0020] In the figure: 1, linear motor; 11, motor shell; 12, stator assembly; 13, rotor assembly; 2, shock absorber; 21, working cylinder outer cylinder; 211, first oil port; 22, working cylinder inner cylinder; 23, outer working chamber; 24, rod cavity; 25, rodless cavity; 26, guide; 261, damping valve; 262, oil way; 27, piston rod; 28, piston; 29, oil seal; 3, base; 4, bottom valve; 5, buffer limiting block; 6, limiting ring; 7, connecting device; 71, connecting sleeve; 72, gasket; 73, fastener; 74, flange plate; 8, integrated switch valve; 81, valve block; 811, second oil port; 82, protective shell; 83, valve core; 831, third oil port; 832, fourth oil port; 84, electromagnetic coil; 85, valve sleeve; 86, current interface. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application are described below in conjunction with the accompanying drawings.

[0022] As shown in Figure 1 , Figure 2 The present application provides a linear motor oil gas spring suspension assembly, which comprises a linear motor 1 and a shock absorber 2 arranged in the linear motor 1. The linear motor 1 and the shock absorber 2 are integrated. The stator assembly 12 of the linear motor 1 is arranged on the motor shell 11, and the rotor assembly 13 is arranged on the working cylinder outer tube 21 of the shock absorber 2. The stator assembly 12 and the rotor assembly 13 are coupled by electromagnetic coupling, and the non-contact support of the two is realized by permanent magnets or electromagnetic force. The rotor assembly 13 can reciprocate along the vertical direction and recover energy, and the vibration energy during the driving of the automobile is converted into electric energy. The linear motor oil gas spring suspension assembly has the functions of guiding and damping, effectively buffers the impact force transmitted from the road surface during the operation of the vehicle, controls the size and direction of the electromagnetic force to realize the lifting and lowering of the vehicle body, and ensures the stable operation of the vehicle. The shock absorber 2 is arranged with a piston rod 27, a working cylinder inner tube 22 and a working cylinder outer tube 21 from inside to outside. The upper end of the piston rod 27 is connected to the vehicle body, and a displacement sensor (not shown in the figure) is installed on the piston rod 27. The ECU combines the feedback signals of the displacement sensor, the vehicle body acceleration sensor and the pressure sensor to control the movement of the linear motor 1 in real time. The lower ends of the working cylinder outer tube 21 and the working cylinder inner tube 22 are connected by a bottom valve 4, and the bottom valve 4 is installed on a base 3. The base 3 is used to connect the wheels. The working cylinder outer tube 21 is provided with two first oil ports 211 on the outer periphery. The first oil ports 211 are respectively connected to two integrated on-off valves 8. The integrated on-off valves 8 are respectively connected to a low-pressure accumulator and a stiffness accumulator (not shown in the figure), so as to realize the exchange of oil between the shock absorber 2 and the low-pressure accumulator and the stiffness accumulator. The stiffness accumulator drives the oil in and out by gas.

[0023] A buffer limiting block 5 is arranged between the upper end of the motor shell 11 and the piston rod 27. An oil seal 29 is arranged on the outer periphery of the piston rod 27. The outer periphery of the oil seal 29 and the inner wall of the upper end of the working cylinder outer tube 21 are provided with matching threads, so that the piston rod 27 is connected to the working cylinder outer tube 21 by the oil seal 29. The cavity between the working cylinder inner tube 22 and the working cylinder outer tube 21 is an outer working cavity 23. The piston rod 27 and the piston 28 connected to the lower end of the piston rod 27 divide the inner cavity of the working cylinder outer tube 21 into a rod cavity 24 and a rodless cavity 25. The piston rod 27 and the piston 28 can move up and down in the working cylinder inner tube 22. The piston 28 and the working cylinder inner tube 22 are sealed by a sealing device. In this embodiment, the sealing device is a gasket and a sealing ring, which can achieve better sealing and ensure that there is almost no leakage of hydraulic oil between the rod cavity 24 and the rodless cavity 25.

[0024] As shown in Figure 2As shown, the piston rod 27, the working cylinder outer tube 21 and the working cylinder inner tube 22 are separated by the guide 26, the guide 26 is provided with a plurality of oil paths 262, the two ends of each oil path 262 are communicated with the outer working chamber 23 and the rod cavity 24 respectively, a damping valve 261 is arranged on each oil path 262, for adjusting the oil liquid into and out of the rod cavity 24, the oil liquid in the rodless cavity 25 enters and exits through the bottom valve 4, the damping valve 261 and the bottom valve 4 can both flow in both directions, realizing the damping adjustment of the oil liquid in and out.

[0025] The outer periphery of the piston rod 27 between the guide 26 and the piston 28 is provided with a limit ring 6, when the piston rod 27 rises, the limit ring 6 rises with the piston rod 27, when the limit ring 6 contacts with the guide 26, the piston 28 reaches the maximum displacement at this time, the limit ring 6 limits the displacement of the piston 28, so that the piston 28 will not appear overstroke.

[0026] The upper end of the piston rod 27 is connected with the vehicle body through the connecting device 7, the connecting device 7 includes two connecting sleeves 71 arranged on the outer periphery of the piston rod 27, a flange plate 74 arranged between the two connecting sleeves 71 and two gaskets 72 arranged on the upper and lower ends of the two connecting sleeves 71, the connecting sleeves 71, the flange plate 74 and the gaskets 72 are fixed through fasteners 73, a plurality of fasteners 73 are arranged on the flange plate 74 in the circumferential direction, thereby realizing the connection with the vehicle body.

[0027] As shown in Figure 1 , Figure 3 The integrated on-off valve 8 integrates the electromagnetic valve and the valve block 81 for supplying and discharging oil liquid, eliminates the external pipeline connection, avoids oil leakage, significantly improves the system response speed, and the structure is extremely compact, saving space. The integrated on-off valve 8 has a valve block 81 welded with the working cylinder outer tube 21, a protection shell 82 arranged on one side of the valve block 81, a valve core 83 movably arranged in the valve block 81 and the valve sleeve 85, and an electromagnetic coil 84 arranged on the outer periphery of the valve core 83, the protection shell 82 has a current interface 86, the external electromagnetic valve is cancelled, the valve block 81 is provided with a second oil port 811, the second oil port 811 is communicated with the first oil port 211 on the working cylinder outer tube 21, the valve core 83 is provided with a plurality of circular third oil ports 831 in the circumferential direction, a fourth oil port 832 is arranged at one end, the fourth oil port 832 is communicated with the second oil port 811, by controlling the current, the magnetic force of the electromagnetic coil 84 can be controlled and the valve core 83 is driven to move in the second oil port 811, thereby controlling the on-off of the hydraulic oil path, when oil is needed, the valve core 83 moves until the third oil port 831 is communicated with the second oil port 811 of the valve block 81, the hydraulic oil enters the outer working chamber 23 in sequence through the second oil port 811, the third oil port 831, the fourth oil port 832 and the first oil port 211, when oil is not needed, the valve core 83 moves until the third oil port 831 is not aligned with the second oil port 811, realizing the cut-off of the hydraulic oil path.

[0028] The specific working principle and process of the present application are as follows: (I) The driving principle of the linear motor 1 The stator assembly 12 of the linear motor 1 is arranged on the motor housing 11, and the mover assembly 13 is arranged on the working cylinder outer tube 21 of the shock absorber 2. The motor housing 11, the stator assembly 12, and the piston rod 27 jointly control the movement of the vehicle body, and the working cylinder outer tube 21, the working cylinder inner tube 22, the mover assembly 13, the bottom valve 4, and the base 3 jointly control the movement of the vehicle wheel.

[0029] The stator assembly 12 drives the piston rod 27 to control the movement of the vehicle body, effectively buffers the road impact, and improves the vehicle smoothness and comfort. When the vehicle body is raised, the polarity of the stator assembly 12 and the mover assembly 13 is adjusted to repel each other to generate a lifting force, and the rising height is accurately controlled by controlling the electromagnetic force; when the vehicle body is lowered, the polarity of the stator assembly 12 and the mover assembly 13 is adjusted to attract each other to generate a downward pressure, and the descending height is accurately controlled by controlling the electromagnetic force.

[0030] (II) ECU unit control principle The ECU receives real-time feedback signals from the piston rod 27 displacement sensor, the vehicle body acceleration sensor, the stiffness accumulator pressure sensor, etc. The ECU receives real-time feedback signals from the piston rod 27 displacement sensor, the vehicle body acceleration sensor, the stiffness accumulator pressure sensor, etc. By adjusting the electromagnetic force (direction, size) of the linear motor 1, the on-off and opening degree of the integrated switch valve 8, and the inflation amount of the stiffness accumulator pressure, the height of the linear motor oil gas spring suspension assembly is accurately controlled, the stiffness is dynamically adapted, and the damping is real-time adjusted.

[0031] (III) In the active mode, the linear motor 1 actively drives the piston rod 27 of the shock absorber 2 to move, combined with the on-off control of the integrated switch valve 8 and the feedback of the displacement sensor, the active lifting of the vehicle body height can be realized.

[0032] When the vehicle body needs to be raised, the integrated switch valve 8 connected with the low-pressure accumulator is powered on to be in an open state, the integrated switch valve 8 connected with the stiffness accumulator is powered on to be in a closed state, the linear motor 1 drives the piston rod 27 and the piston 28 to move upward, at this time, the rod cavity 24 pressurizes the oil (as a high-pressure cavity), and the pressurized oil sequentially flows along the guide 26, the outer working cavity 23, the bottom valve 4 into the rodless cavity 25, the rodless cavity 25 absorbs oil from the low-pressure accumulator (as a low-pressure cavity, acting as a pump), and the shock absorber 2 is raised, and the ECU realizes real-time damping adjustment by controlling the opening degree of the integrated switch valve 8 connected with the low-pressure accumulator and cooperating the bottom valve 4 with the damping valve 261. In order to maintain the vehicle body height when the linear motor 1 stops working, the ECU controls the air charging into the stiffness accumulator when the linear motor 1 drives the piston rod 27 to rise, the gas pressure in the stiffness accumulator is increased to increase the oil pressure in the stiffness accumulator, the displacement sensor monitors the displacement of the piston rod 27 in real time and feeds back to the ECU, the pressure sensor on the stiffness accumulator synchronously feeds back the pressure signal, and the ECU adjusts the gas pressure charged into the stiffness accumulator according to the target displacement of the piston rod 27. After the air charging is completed, the integrated switch valve 8 connected with the stiffness accumulator is powered off to be opened, the high-pressure oil in the stiffness accumulator is quickly supplemented to the rodless cavity 25 of the shock absorber 2, so that the rodless cavity 25 is avoided to be in a negative pressure or low pressure state, at this time, the linear motor 1 stops working, and the vehicle body height can be kept stable.

[0033] When the vehicle body needs to be lowered, the integrated switch valve 8 connected with the low-pressure accumulator is powered on to be opened, the integrated switch valve 8 connected with the stiffness accumulator is powered on to be closed, the linear motor 1 drives the piston rod 27 to move downward, the rodless cavity 25 of the shock absorber 2 pressurizes the oil (as a high-pressure cavity), and the rod cavity 24 absorbs the oil (as a low-pressure cavity, acting as a pump), so that the shock absorber 2 is lowered, and during the lowering process, part of the oil in the rodless cavity 25 flows into the rod cavity 24, and the other part flows into the low-pressure accumulator through the opened integrated switch valve 8, so that the vehicle body height is stably adjusted.

[0034] (4) In the passive mode, the linear motor 1 does not work, and the linear motor oil and gas spring suspension assembly adjusts and absorbs vibration through its elasticity and damping.

[0035] In passive mode, the integrated switch valve 8 connected with low pressure accumulator is closed by power off, the integrated switch valve 8 connected with stiffness accumulator is opened by power on, the stiffness accumulator, the integrated switch valve 8 connected therewith, the bottom valve 4 and the rodless cavity 25 of the shock absorber 2 form a communication loop with the rod cavity 24, if the vehicle body shakes upward, the piston rod 27 and the piston 28 move downward, the rodless cavity 25 is extruded to be smaller, a part of oil enters the stiffness accumulator and needs to overcome the damping force, so that the vehicle body can absorb the vibration; when the vehicle shakes downward, the piston rod 27 and the piston 28 move upward, the rod cavity 24 extrudes oil, the rodless cavity 25 absorbs oil from the stiffness accumulator, the hydraulic oil flows back and forth between the rodless cavity 25 and the rod cavity 24, between the shock absorber 2 and the stiffness accumulator, by adjusting the opening of the integrated switch valve 8 connected with the shock absorber 2 and the stiffness accumulator, combining the bidirectional flow characteristics of the bottom valve 4 and the damping valve 261, the damping adjustment of the oil in and out is realized, the damping force resisting the movement is generated to convert the jolt energy into heat and dissipate, so that the vehicle body shakes down quickly and stably.

[0036] The above description is an explanation of the present application, not a limitation of the application, the present application can be modified in any form without departing from the spirit of the present application.

Claims

1. A linear motor oil gas spring suspension assembly, comprising a linear motor (1) and a shock absorber (2) arranged therein, the shock absorber (2) is sequentially arranged from inside to outside a liftable piston rod (27), a working cylinder inner cylinder (22) and a working cylinder outer cylinder (21), the upper end and the lower end of the working cylinder outer cylinder (21) and the working cylinder inner cylinder (22) are connected through a guide (26) and a bottom valve (4) respectively, an outer working chamber (23) is arranged between the working cylinder outer cylinder (21) and the working cylinder inner cylinder (22), a piston (28) is arranged at the lower end of the piston rod (27), which separates the inner cavity of the working cylinder inner cylinder (22) into a rod cavity (24) and a rodless cavity (25), a stator assembly (12) of the linear motor (1) is arranged on a motor shell (11), a rotor assembly (13) is arranged on the working cylinder outer cylinder (21) of the shock absorber (2), the lifting of the piston rod (27) is driven through the electromagnetic coupling of the stator assembly (12) and the rotor assembly (13), so as to control the oil compression or oil suction of the rod cavity (24) and the rodless cavity (25), characterized in that: The outer periphery of the cylinder outer tube (21) is provided with a plurality of first oil ports (211), the first oil ports (211) are communicated with the outer working chamber (23), an integrated switch valve (8) is arranged outside the first oil ports (211), the integrated switch valve (8) has a valve block (81) fixed with the cylinder outer tube (21), a valve core (83) movably arranged in the valve block (81) and a valve sleeve (85), and an electromagnetic coil (84) sleeved outside the valve core (83), the movement of the valve core (83) is controlled through the electromagnetic coil (84), so as to control the opening and closing of the hydraulic oil path at the first oil ports (211).

2. The linear motor oil gas spring suspension assembly of claim 1, wherein: The valve block (81) is provided with a through second oil port (811), the second oil port (811) is communicated with the first oil ports (211), the valve core (83) is provided with a plurality of third oil ports (831) in the circumferential direction, and one end is provided with a fourth oil port (832), the fourth oil port (832) is communicated with the second oil port (811), the opening and closing of the third oil ports (831) and the second oil port (811) are realized by controlling the movement of the valve core (83), so as to control the opening and closing of the hydraulic oil path at the first oil ports (211).

3. The linear motor oil gas spring suspension assembly of claim 1, wherein: The integrated switch valve (8) further has a protective shell (82) arranged on one side of the valve block (81), and a current interface (86) is arranged on the protective shell (82).

4. The LEM oil-gas spring suspension assembly of claim 1, wherein: A plurality of oil paths (262) are arranged on the guide (26), the two ends of each oil path (262) are communicated with the outer working chamber (23) and the rod cavity (24) respectively, and a damping valve (261) is arranged on each oil path (262).

5. The LEM oil-gas spring suspension assembly of claim 1, wherein: The upper end of the piston rod (27) is connected with the vehicle body through the connecting device (7).

6. The LEM oil-gas spring suspension assembly of claim 4, wherein: The connecting device (7) comprises two connecting sleeves (71) sleeved on the outer periphery of the piston rod (27), a flange plate (74) arranged between the two connecting sleeves (71), and two gaskets (72) arranged at the upper and lower ends of the two connecting sleeves (71), the connecting sleeves (71), the flange plate (74) and the gaskets (72) are fixed through fasteners (73), and a plurality of fasteners (73) are arranged on the flange plate (74) in the circumferential direction.

7. The LEM oil spring suspension assembly of claim 1, wherein: A limiting ring (6) is arranged on the outer periphery of the piston rod (27) between the guide (26) and the piston (28).

8. The LEM oil-gas spring suspension assembly of claim 1, wherein: The bottom valve (4) can flow in both directions, the bottom valve (4) is installed on the base (3), and the base (3) is connected with the wheel.

9. The LEM oil spring suspension assembly of claim 1, wherein: The outer periphery of the piston rod (27) is sleeved with an oil seal (29), the outer periphery of the oil seal (29) and the inner wall of the upper end of the cylinder outer tube (21) are provided with matched threads, and the piston rod (27) is connected with the cylinder outer tube (21) through the oil seal (29).

10. The LEM oil-gas spring suspension assembly of claim 9, wherein: A buffer limiting block (5) is arranged between the upper end of the motor shell (11) and the piston rod (27).

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