Integrated dual-chamber oil-gas damper and working method

Abstract

The present invention discloses an integrated dual-chamber oil-gas damper and a working method. A first floating piston divides the interior of a first cylinder into a first air chamber and a first oil chamber. A main piston is fixedly arranged on the periphery of the first cylinder body. The main piston divides the interior of a second cylinder into a main chamber and a secondary chamber. The main chamber is directly connected to the first oil chamber, and the main piston is also provided with a damping hole. The second floating piston is movably sleeved in the secondary chamber, and it divides the secondary chamber into a second air chamber and a second oil chamber. The second oil chamber is connected to the main chamber through a damping hole. The damper is provided with a first air chamber and a second air chamber. When working normally, the pressure of the second air chamber can remain unchanged, that is, the second floating piston can maintain its initial state unchanged, and only the first floating piston moves. When encountering a large impact, the first floating piston and the second floating piston can work simultaneously to reduce the overall stiffness of the system to alleviate the impact and improve the driving comfort.

Description

Technical Field

[0001] The invention relates to an integrated double-air chamber oil-gas damper and a working method. Background Art

[0002] The oil-gas damper is a suspension system that uses inert gas (usually nitrogen) as the elastic medium of the suspension to generate elastic force and hydraulic oil as the force transmission medium. The principle of shock absorption is that the oil flows through the damping hole on the main piston to generate damping force to achieve energy attenuation during the up and down movement of the piston; and the compressibility of the gas is used to absorb and release energy. Since the gas elastic force generated by the gas during the compression process has nonlinear characteristics, the stiffness of the oil-gas damper can change with the relative displacement of the piston and the hydraulic cylinder. It has certain nonlinear characteristics and can coordinate the balance between the stability and maneuverability of the vehicle to a large extent.

[0003] Traditional dual-chamber oil-gas dampers all adopt an external gas energy storage structure, which plays a buffering and shock-absorbing role when the damper moves up and down. This arrangement places the gas chamber outside and requires additional pipelines for connection. The structural integration is low and is not conducive to compact structural design. On the other hand, placing the gas energy storage device externally is easily affected by external factors in actual work, and the oil-gas damper has relatively high requirements on the sealing performance between the components. Damage to any part is likely to lead to failure and leakage. Therefore, the cost of producing and maintaining the oil-gas damper is relatively high. Summary of the invention

[0004] The present invention provides an integrated dual-chamber oil-gas damper and a working method, which overcomes the shortcomings of the background technology. One of the technical solutions adopted by the present invention to solve the technical problem is:

[0005] Integrated dual-chamber oil-gas damper, which includes:

[0006] A first cylinder body, in which a first floating piston is floatingly arranged, and the first floating piston divides the interior of the first cylinder body into a first air chamber and a first oil chamber;

[0007] A second cylinder body, wherein the first cylinder body is movably sleeved in the second cylinder body, a main piston is fixedly arranged on the periphery of the first cylinder body, the main piston is located in the second cylinder body, the main piston divides the interior of the second cylinder body into a main chamber and a sub-chamber, the main chamber is directly connected to the first oil chamber, and the main piston is also provided with a damping hole; and

[0008] The second floating piston is movably sleeved in the sub-chamber and divides the sub-chamber into a second air chamber and a second oil chamber. The second oil chamber is connected to the main chamber through a damping hole.

[0009] In a preferred embodiment, the first air cavity and the second air cavity can be filled with inert gas of the same or different pressures.

[0010] In a preferred embodiment: the inner wall of the second oil chamber is provided with a limiting flange for axially limiting the second floating piston.

[0011] In a preferred embodiment: the main piston is provided with a hollow mounting cavity, and the end of the first cylinder body is fixedly connected in the mounting cavity.

[0012] In a preferred embodiment: a limiting step for axially limiting the first floating piston is provided at the bottom port of the installation cavity.

[0013] In a preferred embodiment: a first sealing member is disposed on the outer periphery of the first floating piston to prevent the first air chamber from communicating with the first oil chamber; a second sealing member is disposed on the outer periphery of the second floating piston to prevent the second air chamber from communicating with the second oil chamber.

[0014] In a preferred embodiment, the volume of the second oil chamber is smaller than the volume of the main chamber.

[0015] The second technical solution adopted by the present invention to solve its technical problem is:

[0016] The working method of the integrated dual-chamber oil-gas damper, which uses any of the integrated dual-chamber oil-gas dampers described above, comprises: when the main piston compresses the main chamber, part of the oil in the main chamber with reduced volume will enter the second oil chamber through the damping hole to achieve the effect of attenuating vibration energy, and then the oil in the second oil chamber will squeeze the second floating piston to move toward the second air chamber to compress the gas in the second air chamber, and at the same time, another part of the oil in the main chamber enters the first oil chamber and squeezes the first floating piston, and the gas in the first air chamber is compressed. At this time, the first floating piston and the second floating piston both generate corresponding gas restoring force to absorb the load to absorb the vibration energy;

[0017] When the main piston releases the main chamber, the gas restoring force generated by the first floating piston and the second floating piston will move the first floating piston and the second floating piston in the opposite direction to restore them to their initial states. The oil in the first oil chamber will flow back to the main chamber, and the oil in the second oil chamber will also flow through the damping hole and back to the main chamber, so as to reduce the amplitude, alleviate the vibration of the vehicle body and improve the stability of the vehicle operation.

[0018] Compared with the background technology, this technical solution has the following advantages:

[0019] 1. The damper has the air chamber built into the cylinder body, which can reduce the external additional structure, increase the compactness and safety of the structure, avoid the pressure loss along the way when the oil flows into or out of the damper, significantly reduce the influence of the pipeline on the system pressure, effectively provide the system pressure feedback speed, make the damper more sensitive to external changes, can obtain better shock absorption effect, improve work efficiency, and also simplify the structural arrangement of the oil and gas damper, which is conducive to the compact structure design of the system. In addition, the damper is provided with a first air chamber and a second air chamber. When working normally, the pressure of the second air chamber can remain unchanged, that is, the second floating piston can maintain the initial state unchanged, and only the first floating piston moves; when encountering a large impact, the first floating piston and the second floating piston can work at the same time to reduce the overall stiffness of the system to alleviate the impact and improve driving comfort.

[0020] 2. The first air cavity and the second air cavity can be filled with inert gas of the same or different pressures according to actual needs. For example, for ordinary vehicles, the first air cavity and the second air cavity can be filled with inert gas of different pressures, so as to ensure that the vehicle can maintain a good buffering and shock absorption effect when driving on flat and rugged roads; for some heavy vehicles, due to the large load, if only one air cavity is involved in the work, it will cause the vehicle's rigidity to be too large and affect the driving comfort. At this time, the first air cavity and the second air cavity can be filled with inert gas of the same pressure, which can reduce the overall rigidity of the vehicle and improve the comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 The overall cross-sectional schematic diagram of an integrated dual-chamber oil-gas damper of a preferred embodiment is depicted.

[0023] Figure 2 A schematic cross-sectional view of the main piston is shown.

[0024] Figure 3 A schematic top view of the main piston is shown. DETAILED DESCRIPTION

[0025] Please refer to Figures 1 to 3 A preferred embodiment of an integrated dual-chamber oil-gas damper comprises a first cylinder body 10, a second cylinder body 20, a first floating piston 30, a second floating piston 40 and a main piston 50.

[0026] The second cylinder body 20 is a cylinder body with an opening at the top. The second cylinder body 20 may be an integrated structure, or may be a structure in which a plurality of parts are assembled, but the present invention is not limited thereto.

[0027] A first floating piston 30 is provided in the first cylinder 10 to separate the first cylinder 10 into a first air chamber 11 and a first oil chamber 12. Figure 1 As shown, the first air chamber 11 and the first oil chamber 12 are respectively located above and below the first floating piston 30 , and the bottom end of the first oil chamber 12 is open.

[0028] The first cylinder 10 is movably sleeved in the second cylinder 20, and its top end protrudes out of the second cylinder 20. A main piston 50 is fixedly arranged on the outer periphery of the first cylinder 10. The main piston 50 is located in the second cylinder 20. The main piston 50 divides the interior of the second cylinder 20 into a main chamber 21 and a secondary chamber. The main chamber 21 is directly connected to the first oil chamber 12, and the main piston 50 is also provided with a damping hole 51. Figure 3 As shown, the number of the damping holes 51 is three and they are arranged in a ring-shaped manner; the number of the damping holes is not limited thereto, and may also be four or five.

[0029] The second floating piston 40 is movably sleeved in the secondary chamber, and divides the secondary chamber into a second air chamber 41 and a second oil chamber 42 arranged vertically, and the second oil chamber 42 is connected to the main chamber 21 through a damping hole 51. In this embodiment, the volume of the second oil chamber 42 is smaller than that of the main chamber 21.

[0030] In this embodiment, the first air cavity 11 and the second air cavity 41 can be filled with inert gas of the same or different pressures. The first air cavity and the second air cavity can be filled with inert gas of the same or different pressures according to actual needs. For example, for ordinary vehicles, inert gas of different pressures can be filled in the first air cavity and the second air cavity, so that the vehicle can maintain a good buffering and shock absorption effect when driving on flat and rugged roads; for some heavy vehicles, due to the large load, if only one air cavity is involved in the work, the rigidity of the vehicle will be too large and affect the driving comfort. At this time, the first air cavity and the second air cavity can be filled with inert gas of the same pressure, which can reduce the overall rigidity of the vehicle and improve the comfort.

[0031] In this embodiment, the inner wall of the second oil chamber 42 is provided with a limiting flange 43 for axially limiting the second floating piston 40. Figure 1 As shown, a limiting member 22 is disposed on the side of the second cylinder body 20 , and the limiting member 22 is laterally inserted into the second oil chamber 42 so that a limiting flange 43 is formed at its end in the second oil chamber 42 .

[0032] In this embodiment, Figure 2 As shown, the main piston 50 is provided with a hollow mounting cavity 52 , and the end of the first cylinder body 10 is fixedly connected in the mounting cavity 52 .

[0033] In this embodiment, a limiting step 53 for axially limiting the first floating piston 30 is provided at the bottom end of the installation cavity 52 .

[0034] In this embodiment, a first seal is disposed on the outer periphery of the first floating piston 30 to prevent the first air chamber 11 from communicating with the first oil chamber 12 ; a second seal is disposed on the outer periphery of the second floating piston 40 to prevent the second air chamber 41 from communicating with the second oil chamber 42 .

[0035] The working method of the integrated dual-chamber oil-gas damper includes: when the main piston 50 compresses the main chamber 21, part of the oil in the main chamber 21 with reduced volume will enter the second oil chamber 42 through the damping hole 51 to achieve the effect of attenuating vibration energy, and then the oil in the second oil chamber 42 will squeeze the second floating piston 40 to move toward the second air chamber 41 to compress the gas in the second air chamber 41, and at the same time, another part of the oil in the main chamber 21 enters the first oil chamber 12 and squeezes the first floating piston 30, and the gas in the first air chamber 11 is compressed. At this time, the first floating piston 30 and the second floating piston 40 both generate corresponding gas restoring forces to absorb the load to absorb the vibration energy;

[0036] When the main piston 50 releases the main chamber 21, the gas restoring force generated by the first floating piston 30 and the second floating piston 40 respectively moves the first floating piston 30 and the second floating piston 40 in the opposite direction to restore to the initial state, and the oil in the first oil chamber 12 will flow back to the main chamber 21, and the oil in the second oil chamber 42 will also flow through the damping hole 51 and flow back to the main chamber 21, so as to reduce the amplitude, alleviate the vibration of the vehicle body, and improve the stability of the vehicle operation.

[0037] The damper has the air chamber built into the cylinder body, which can reduce the external additional structure, increase the compactness and safety of the structure, avoid the pressure loss along the way when the oil flows into or out of the damper, significantly reduce the influence of the pipeline on the system pressure, effectively provide the system pressure feedback speed, make the damper more sensitive to external changes, can obtain better shock absorption effect, improve work efficiency, and also simplify the structural arrangement of the oil and gas damper, which is conducive to the compact structure design of the system. In addition, the damper is provided with a first air chamber 11 and a second air chamber 41. When working normally, the pressure of the second air chamber 41 can remain unchanged, that is, the second floating piston 40 can maintain the initial state unchanged, and only the first floating piston 30 is active; when encountering a large impact, the first floating piston 30 and the second floating piston 40 can work at the same time to reduce the overall stiffness of the system to alleviate the impact and improve the driving comfort.

[0038] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. Integrated dual-chamber oil-gas damper, characterized by: It includes: A first cylinder body, in which a first floating piston is floatingly arranged, and the first floating piston divides the interior of the first cylinder body into a first air chamber and a first oil chamber; A second cylinder body, wherein the first cylinder body is movably sleeved in the second cylinder body, a main piston is fixedly arranged on the periphery of the first cylinder body, the main piston is located in the second cylinder body, the main piston divides the interior of the second cylinder body into a main chamber and a sub-chamber, the main chamber is directly connected to the first oil chamber, and the main piston is also provided with a damping hole; and The second floating piston is movably sleeved in the secondary chamber and divides the secondary chamber into a second air chamber and a second oil chamber. The second oil chamber is connected to the main chamber through a damping hole. The volume of the second oil chamber is smaller than that of the main chamber. During normal operation, the pressure in the second air chamber remains unchanged, the second floating piston remains in its initial state, and only the first floating piston moves; when encountering a large impact, the first floating piston and the second floating piston work at the same time; The first air cavity and the second air cavity may be filled with inert gas of the same or different pressures; The main piston is provided with a hollow installation cavity, and the end of the first cylinder body is fixedly connected in the installation cavity.

2. The integrated dual-chamber oil-gas damper according to claim 1, characterized in that: The inner wall of the second oil chamber is provided with a limiting flange for axially limiting the second floating piston.

3. The integrated dual-chamber oil-gas damper according to claim 1, characterized in that: A limiting step for axially limiting the first floating piston is provided at the bottom port of the installation cavity.

4. The integrated dual-chamber oil-gas damper according to claim 1, characterized in that: A first seal is disposed on the outer periphery of the first floating piston to prevent the first air cavity from communicating with the first oil cavity; a second seal is disposed on the outer periphery of the second floating piston to prevent the second air cavity from communicating with the second oil cavity.

5. A working method of an integrated dual-chamber oil-gas damper, which uses the integrated dual-chamber oil-gas damper according to any one of claims 1 to 4, characterized in that: When the main piston compresses the main chamber, part of the oil in the main chamber with reduced volume will enter the second oil chamber through the damping hole, and then the oil in the second oil chamber will squeeze the second floating piston to move toward the second air chamber to compress the gas in the second air chamber. At the same time, another part of the oil in the main chamber enters the first oil chamber and squeezes the first floating piston, and the gas in the first air chamber is compressed. At this time, both the first floating piston and the second floating piston generate corresponding gas restoring force to absorb the load to absorb the vibration energy. When the main piston releases the main chamber, the gas restoring force generated by the first floating piston and the second floating piston respectively moves the first floating piston and the second floating piston in the opposite direction to restore to the initial state, the oil in the first oil chamber will flow back to the main chamber, and the oil in the second oil chamber will also flow through the damping hole back to the main chamber.

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