CN220168432U - Hydro-pneumatic spring and vehicle suspension system - Google Patents

Abstract

The utility model relates to the technical field of hydraulic machinery and specifically discloses a hydro-gas spring and a vehicle suspension system. The first cylinder of the hydro-gas spring is provided with a cavity _A1 and a cavity B. The inside of the piston rod is a hollow structure, wherein It includes cavity C and cavity D. The piston is provided with a compensation flow channel that is connected to cavity C and cavity B respectively. Both cavity A ₁ and cavity C are filled with damping oil, and cavity D is filled with Gas, a number of damping holes are provided in the damper, the two ends of the hydraulic flow channel are connected to the damper and the cavity A ₁ respectively, and the damper is connected to the energy storage device. The uneven road surface of the vehicle will cause the piston to move up and down in the first cylinder. Under the action of the pressure difference, the damping oil in the cavity _A1 flows through several damping holes of the damper and generates heat through the small hole throttling principle. It consumes energy and attenuates the vibration of the vehicle. The load is borne by the elastic deformation of the gas. It can adjust the stiffness of the vehicle suspension system in real time and has excellent vibration damping performance.

Description

A kind of oil and gas spring and vehicle suspension system

Technical field

The utility model relates to the technical field of hydraulic machinery, and in particular to an oil and gas spring and a vehicle suspension system.

Background technique

The suspension system is one of the important assemblies of motor vehicles. Existing suspensions often adopt the structural form of leaf springs and cylindrical shock absorbers. The elastic elements and damping elements are separated, and the elastic characteristics of the elastic elements are nearly linear and the stiffness is It is almost constant. When a motor vehicle is driving on an uneven road, the impact from the road is very large and the vehicle body vibrates violently. This requires the suspension to have sufficient stiffness to absorb the vibration energy. At this time, the spring stiffness appears If it is too small, it will not absorb much vibration energy, its buffering performance is too poor, and it often hits the limiter. Therefore, it cannot adapt to people's requirements for vehicle smoothness and ride comfort under working conditions such as changes in body mass.

Therefore, there is an urgent need for an oil and gas spring to solve the above problems.

Utility model content

The purpose of this utility model is to provide a hydropneumatic spring and a vehicle suspension system that take into account nonlinear variable stiffness characteristics and good damping characteristics, can adjust the stiffness of the vehicle suspension system in real time, have excellent vibration damping performance, and take into account both ride comfort and good damping characteristics. Comfort.

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

On the one hand, the utility model provides an oil and gas spring, which includes:

A first cylinder, a first cavity is provided inside the first cylinder, and a hydraulic flow channel is provided on the side wall of the first cylinder;

The piston includes a first piston sleeve and a piston rod connected to the first piston sleeve. The first piston sleeve is slidingly connected to the inner wall of the first cavity and divides the first cavity into cavities. Body A ₁ and cavity A ₂ , the piston rod is partially located in the cavity A ₂ , an annular boss is protruding from the inner wall of the cavity A ₂ , and the annular boss is slidingly connected to the piston rod , the outer periphery of the piston rod is spaced apart from the side wall of the cavity _A2 and forms a cavity B, and a second cavity is provided inside the piston rod;

The second piston sleeve is slidably disposed on the inner wall of the second cavity, and divides the second cavity into cavity C and cavity D. The piston is provided with a cavity respectively connected to the cavity C and the cavity D. The compensation flow channel connected with the cavity B, the cavity _A1 and the cavity C are both filled with damping oil, and the cavity D is filled with gas;

Damper and energy storage device, the damper is provided with a number of damping holes, the two ends of the hydraulic flow channel are connected to the damper and the cavity A ₁ respectively, the damper and the energy storage device Connected.

Wherein, the energy storage device includes:

a second cylinder, a third cavity is provided inside the second cylinder;

A third piston sleeve is slidably disposed on the inner wall of the third cavity, and divides the third cavity into cavity E and cavity F. The damper is connected to the cavity E, and the cavity The body E and the cavity F are filled with damping oil and gas respectively.

Wherein, the top of the cavity E is provided with an oil inlet, and the oil inlet is provided with an oil valve. The oil valve is used to open or close the oil inlet.

Among them, the damper can have three levels of adjustable damping, and is equipped with a compression valve and a recovery valve inside. The compression valve is configured to only allow damping oil to flow from the cavity _A1 to the cavity E, so The recovery valve is configured to only allow damping oil to flow from the cavity E to the cavity A ₁ .

Wherein, the bottom end of the piston rod is provided with an air passage communicating with the cavity D, and a gas valve is provided on the air passage, and the gas valve is used to open or close the air passage.

Wherein, the piston rod is covered with a dust cover, the dust cover is fixedly connected to the first cylinder and is located outside the first cylinder.

Wherein, a displacement sensor is provided at the bottom end of the first cylinder, and the displacement sensor is used to detect the position of the piston rod.

Wherein, the first cylinder is provided with an oil pressure sensor, and the oil pressure sensor is used to detect the oil pressure inside the cavity _A1 .

Wherein, the first cylinder is also provided with a temperature sensor, and the temperature sensor is used to detect the temperature inside the cavity _A1 .

On the other hand, the present utility model also provides a vehicle suspension system, including an axle, wherein the vehicle suspension system further includes the oil and gas spring in any of the above solutions, and the piston rod is connected to the axle, The first cylinder is used to connect to the chassis.

The beneficial effects of this utility model are:

The utility model provides an oil and gas spring and a vehicle suspension system. The oil and gas spring includes a first cylinder, a piston, a second piston sleeve, a damper and an energy storage device. A first cavity is provided inside the first cylinder, and The side wall of the first cylinder is provided with a hydraulic flow channel. The piston includes a first piston sleeve and a piston rod connected to the first piston sleeve. The first piston sleeve is slidingly connected to the inner wall of the first cavity and connects the first cavity with the first piston sleeve. The body is divided into cavity A ₁ and cavity A _2. The piston rod is partially located in cavity A _2. The inner wall of cavity A ₂ is provided with an annular boss. The annular boss is slidingly connected to the piston rod. The outer periphery of the piston rod is connected with the piston rod. The side walls of cavity A ₂ are spaced apart to form cavity B. A second cavity is provided inside the piston rod. The second piston sleeve is slidably arranged on the inner wall of the second cavity and divides the second cavity into cavity C. and cavity D. The piston is provided with a compensation flow channel that is connected to cavity C and cavity B respectively. Both cavity A ₁ and cavity C are filled with damping oil. Cavity D is filled with gas. The damper There are a number of damping holes in it, the two ends of the hydraulic flow channel are connected to the damper and the cavity A ₁ respectively, and the damper is connected to the energy storage device. With this arrangement, when the vehicle is driving, uneven road surface will cause the piston to move up and down in the first cylinder. Under the action of the pressure difference, the damping oil in the cavity _A1 flows through several damping holes of the damper. Heat is generated through the throttling principle of the damping hole to consume energy and attenuate the vibration of the vehicle. At the same time, due to the existence of the compensation flow channel, the upper and lower pressure of the piston can be balanced, and the load on the vehicle is borne by the elastic deformation of the gas, reducing ground impact. , which in turn makes the oil and gas spring have non-linear variable stiffness characteristics and good damping characteristics. It can adjust the stiffness of the vehicle suspension system in real time, has excellent vibration damping performance, and takes into account both ride comfort and ride comfort.

Description of drawings

Figure 1 is a schematic structural diagram of the oil and gas spring provided by the utility model.

in:

1. First cylinder; 101. Hydraulic flow channel; 2. First piston sleeve; 3. Compensation flow channel; 4. Piston rod; 5. Second piston sleeve; 6. Annular boss; 7. Damper; 8 , Second cylinder; 9. Third piston sleeve; 10. Oil inlet; 11. Air passage; 12. Dust cover; 13. Displacement sensor.

Detailed ways

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to explain the present invention, but should not be understood as limiting the present invention.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. The orientation structure and operation of the invention cannot be construed as limitations of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

Unless otherwise expressly stipulated and limited, the terms "installation", "connection", "connection" and "fixing" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or a detachable connection. It can be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components or an interaction between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Unless otherwise expressly provided and limited, the term "above" or "below" a second feature for a first feature may include direct contact between the first feature and the second feature, or may include direct contact between the first feature and the second feature. Rather, it is through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “below” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementations.

As shown in Figure 1, this embodiment provides a hydro-gas spring. The hydro-gas spring includes a first cylinder 1, a piston, a second piston sleeve 5, a damper 7 and an energy storage device. The first cylinder 1 is provided with a third A cavity, and the side wall of the first cylinder 1 is provided with a hydraulic flow channel 101. The piston includes a first piston sleeve 2 and a piston rod 4 connected to the first piston sleeve 2. The first piston sleeve 2 and the first cavity The inner walls of the body are slidingly connected, and the first cavity is divided into cavity A ₁ and cavity A _2. The piston rod 4 is partially located in the cavity A _2. The inner wall of the cavity A ₂ is provided with an annular boss 6, annular The boss 6 is slidingly connected to the piston rod 4. The outer periphery of the piston rod 4 is spaced apart from the side wall of the cavity _A2 to form the cavity B. A second cavity is provided inside the piston rod 4, and the second piston sleeve 5 is slidably arranged on the The inner wall of the second cavity separates the second cavity into cavity C and cavity D. The piston is provided with a compensation flow channel 3 that communicates with cavity C and cavity B respectively. Cavity A ₁ and cavity C is filled with damping oil, cavity D is filled with gas, and several damping holes are provided in the damper 7. Both ends of the hydraulic flow channel 101 are connected to the damper 7 and the cavity A ₁ respectively, and the damper 7 and the reservoir are respectively connected. Energy devices are connected. With this arrangement, when the vehicle is driving, uneven road surface will cause the piston to move up and down in the first cylinder 1. Under the action of the pressure difference, the damping oil in the cavity A ₁ flows through several damping holes of the damper 7 , generate heat through the damping hole throttling principle to consume energy and attenuate the vibration of the vehicle. At the same time, due to the existence of the compensation flow channel 3, it can ensure that the upper and lower pressure of the piston is balanced, and the load on the vehicle is determined by the elasticity of the gas in the cavity D. It can bear deformation and reduce ground impact, so that the oil and gas spring has excellent nonlinear stiffness characteristics and nonlinear damping characteristics, excellent vibration damping performance, and takes into account ride comfort and comfort.

Further, the energy accumulator includes a second cylinder 8 and a third piston sleeve 9. A third cavity is provided inside the second cylinder 8. The third piston sleeve 9 is slidably disposed on the inner wall of the third cavity and connects the third piston sleeve 9 to the inner wall of the third cavity. The three-cavity body is divided into a cavity E and a cavity F. The damper 7 is connected with the cavity E. The cavity E and the cavity F are filled with damping oil and gas respectively. In this embodiment, the gas filled in the cavity D and the cavity F is high-pressure nitrogen. With this arrangement, when the uneven road surface causes the piston to move up and down in the first cylinder 1, under the action of the pressure difference, the cavity E and the cavity F are filled with high-pressure nitrogen. The damping oil in cavity A ₁ flows through several damping holes of damper 7, and generates heat through the throttling principle of the damping holes to consume energy, forming the damping characteristics of the oil and gas spring. The load on the vehicle is determined by cavity D, cavity The elastic deformation of the high-pressure nitrogen in F is borne, forming the elastic characteristics of the oil and gas spring. In this embodiment, the first piston sleeve 2, the second piston sleeve 5 and the third piston sleeve 9 all adopt floating piston sleeves.

In this embodiment, the first cylinder 1 and the second cylinder 8 are spaced apart along the radial direction of the first cylinder 1 . In other embodiments, the energy accumulator and the first cylinder 1 can also be arranged on the same axis, and the second cylinder 8 is fixedly connected to the first cylinder 1 .

Optionally, in order to promptly replace or add damping oil into the cavity E, the top of the cavity E is provided with an oil inlet 10, and the oil inlet 10 is provided with an oil valve, which is used to open or close. Oil inlet 10.

Optionally, in order to make the vehicle produce adaptive damping changes for the impact of different road surfaces, the damper 7 can have three levels of adjustable damping, and is equipped with a compression valve and a recovery valve inside. The compression valve is configured to only allow the damping oil to pass through Chamber A ₁ flows to chamber E, and the recovery valve is configured to only allow damping oil to flow from chamber E to chamber A ₁ .

Optionally, in order to replenish gas into the cavity D in time, the bottom end of the piston rod 4 is provided with an air channel 11 connected with the cavity D. The air channel 11 is provided with a gas valve, and the gas valve is used to open or close the air channel. 11.

Optionally, in order to prevent external dust and other particulate matter from entering the first cylinder 1, a dust cover 12 is set on the piston rod 4. The dust cover 12 is fixedly connected to the first cylinder 1 and is located on the first cylinder 1. outside of cylinder 1.

Optionally, a displacement sensor 13 is provided at the bottom end of the first cylinder 1 , and the displacement sensor 13 is used to detect the position of the piston rod 4 . Specifically, the displacement sensor 13 is a magnetoresistive displacement sensor 13. The outer circumference of the piston rod 4 is plated with magnetic and non-magnetic materials at equal intervals. The magnetoresistive displacement sensor 13 is used at the bottom of the first cylinder 1 to measure the displacement generated by the movement of the piston. The magnetic field changes are then processed to obtain accurate piston displacement data.

Optionally, the first cylinder 1 is provided with an oil pressure sensor, and the oil pressure sensor is used to detect the oil pressure inside the cavity A ₁ . Furthermore, the first cylinder 1 is also provided with a temperature sensor, which is used to detect the temperature inside the cavity A ₁ . In this embodiment, the oil pressure sensor and the oil pressure sensor are both arranged on the top of the first cylinder 1 through threaded connections.

The working principle of oil and gas spring is as follows:

When the vehicle is driving, uneven road surface will cause the piston to move up and down in the first cylinder 1, thereby forming a compression stroke and a recovery stroke.

When the oil and gas spring is in the compression stroke, the piston moves upward, and part of the damping oil in the compression chamber _A1 flows through the damper 7 and enters the chamber E. At this time, the compression valve in the damper 7 opens and the recovery valve closes, thus Push the third piston sleeve 9 to compress the gas in the cavity F. At the same time, under the action of the high-pressure gas in chamber D, the second piston sleeve 5 is pushed upward, and part of the damping oil in the compressed chamber C enters the chamber B through the compensation flow channel 3 to compensate for the empty space in the chamber B after the piston moves upward. out volume.

During the compression stroke, the elastic stiffness is mainly provided by the compressed high-pressure gas in the cavity F; the damping force is provided by the damping hole throttling principle of the damping hole in the damper 7. Since the diameter of the compensation flow channel 3 is large, it can be ignored Its throttling effect.

When the oil and gas spring is in the recovery stroke, the piston moves downward, and part of the damping oil in the compression chamber B enters the chamber C through the compensation flow channel 3, thus pushing the second piston sleeve 5 downward and compressing the gas in the chamber D. . At the same time, under the action of the high-pressure gas in the chamber F, the third piston sleeve 9 is pushed upward, and part of the damping oil in the compression chamber E enters the chamber A ₁ through the damper 7. At this time, the The recovery valve opens and the compression valve closes to make up for the volume vacated by cavity A ₁ after the piston moves downward.

During the recovery stroke, the elastic stiffness is mainly provided by the compressed high-pressure gas in the cavity D, and the damping force is provided by the damping hole throttling principle of the damping hole in the damper 7. Similarly, due to the large diameter of the compensation channel 3, Its throttling effect can be ignored.

This embodiment also provides a vehicle suspension system, including an axle. The vehicle suspension system also includes the oil and gas spring in any of the above solutions. The piston rod 4 is connected to the axle, and the first cylinder 1 is used to connect to the chassis.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. An exhaustive list of all implementations is neither necessary nor possible. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims (10)

1. A hydro-pneumatic spring, comprising:

the hydraulic cylinder comprises a first cylinder barrel (1), wherein a first cavity is arranged in the first cylinder barrel (1), and a hydraulic flow passage (101) is arranged on the side wall of the first cylinder barrel (1);

the piston comprises a first piston sleeve (2) and a piston rod (4) connected with the first piston sleeve (2), wherein the first piston sleeve (2) is in sliding connection with the inner wall of the first cavity and divides the first cavity into a cavity A ₁ And cavity A ₂ The piston rod (4) is partially positioned in the cavity A ₂ In, the cavity A ₂ An annular boss (6) is arranged on the inner wall of the piston rod (4) in a protruding mode, the annular boss (6) is connected with the piston rod (4) in a sliding mode, and the periphery of the piston rod (4) is connected with the cavity A ₂ The side walls of the piston rod (4) are arranged at intervals to form a cavity B, and a second cavity is arranged inside the piston rod;

a second piston sleeve (5) which is arranged on the inner wall of the second cavity in a sliding way and divides the second cavity into a cavity C and a cavity D, and the piston is provided withHas a compensation flow passage (3) respectively communicated with the cavity C and the cavity B, the cavity A ₁ Damping oil is filled in the cavity C, and gas is filled in the cavity D;

the hydraulic flow passage (101) is characterized by comprising a damper (7) and an energy accumulator, wherein a plurality of damping holes are formed in the damper (7), and two ends of the hydraulic flow passage (101) are respectively communicated with the damper (7) and the cavity A ₁ The damper (7) is in communication with the accumulator.

2. The hydro-pneumatic spring of claim 1 wherein the accumulator comprises:

the second cylinder (8) is internally provided with a third cavity;

the third piston sleeve (9) is arranged on the inner wall of the third cavity in a sliding manner, the third cavity is divided into a cavity E and a cavity F, the damper (7) is communicated with the cavity E, and damping oil liquid and gas are respectively filled in the cavity E and the cavity F.

3. A gas spring according to claim 2, characterized in that the top end of the cavity E is provided with an oil feed port (10), the oil feed port (10) being provided with an oil valve for opening or closing the oil feed port (10).

4. A hydro-pneumatic spring as claimed in claim 2, wherein the damper (7) is three-stage damping-adjustable and internally provided with a compression valve configured to allow only damping oil from the cavity a and a return valve ₁ To the cavity E, the recovery valve is configured to only allow damping oil to flow from the cavity E to the cavity A ₁ 。

5. A hydro-pneumatic spring as claimed in claim 1 wherein the bottom end of the piston rod (4) is provided with an air passage (11) in communication with the cavity D, the air passage (11) being provided with a gas valve for opening or closing the air passage (11).

6. A hydro-pneumatic spring as defined in any one of claims 1-5 wherein a dust cap (12) is provided over the piston rod (4), the dust cap (12) being fixedly connected to the first cylinder (1) and being located outside the first cylinder (1).

7. A hydro-pneumatic spring as defined in any one of claims 1-5 wherein the bottom end of the first cylinder (1) is provided with a displacement sensor (13), the displacement sensor (13) being adapted to detect the position of the piston rod (4).

8. A hydro-pneumatic spring as defined by any one of claims 1-5 wherein the first cylinder (1) is provided with an oil pressure sensor for detecting the cavity a ₁ Internal oil pressure.

9. Hydro-pneumatic spring according to claim 8, characterized in that the first cylinder (1) is also provided with a temperature sensor for detecting the cavity a ₁ Internal temperature.

10. Vehicle suspension system comprising an axle, characterized in that it further comprises a hydro-pneumatic spring according to any one of claims 1-9, to which the piston rod (4) is connected, the first cylinder (1) being intended for connection to a chassis.