Linear damping device and shock absorber

Abstract

The utility model discloses linear damping device and shock absorber, linear damping device, its characterized in that, including the shunt piston of setting on piston rod and the pair of subsidiary piston that sets respectively in the both ends of shunt piston and its coupling, the pair of subsidiary piston provides the damping in two movement directions opposite each other respectively. Through multistage valve group and the piston structure of split shunt realize the purpose of the high linear adjustable of damping and noise control.

Description

Technical Field

[0001] This utility model relates to the field of vibration dampers, and particularly to linear damping devices and vibration dampers. Background Technology

[0002] In traditional gasoline-powered vehicles, the noise from the oil flow in the shock absorbers (oil noise) is often masked by the loud engine noise. With the increasing popularity of new energy vehicles, the lower noise levels in driving environments have highlighted the noise problem of shock absorbers. Existing shock absorbers mostly use a single-stage throttle valve structure, which has limited damping characteristics. At low speeds, insufficient damping leads to poor comfort, while at high speeds, it easily generates oil shock and resonance noise. Furthermore, the single valve design results in a slow response during oil reversal, which can also easily cause pressure fluctuations and amplify noise. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of this utility model is to provide a linear damping device and a shock absorber to achieve a wide range of linearly adjustable damping.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A linear damping device includes a split piston sleeved on a piston rod and a pair of auxiliary pistons respectively disposed at both ends of the split piston and coupled thereto, the pair of auxiliary pistons providing damping in two opposing directions of motion.

[0005] Furthermore, the auxiliary piston is press-coupled to the diverter piston via an elastic element and separates to relieve pressure in case of overspeed or overload.

[0006] Furthermore, the auxiliary piston includes a third valve group disposed on one side of the diverter piston for controlling the flow rate between the diverter piston and the auxiliary piston; and a first valve group and a second valve group disposed at the rear end of the flow path, respectively, relative to the third valve group.

[0007] Furthermore, the first valve assembly and the second valve assembly are composite elastic valve assemblies with through-hole throttling structures.

[0008] Furthermore, the elastic element is a disc spring disposed within the second valve assembly.

[0009] Furthermore, the third valve assembly includes a throttling valve plate disposed between the auxiliary piston and the diverting piston, and a valve pad located in the center of the auxiliary piston, wherein the auxiliary piston and the valve pad are separate.

[0010] Furthermore, the auxiliary piston includes a first auxiliary piston and a second auxiliary piston, which are respectively mirror images disposed at both ends of the flow divider piston.

[0011] Furthermore, the flow divider piston is provided with a first flow channel and a second flow channel that are not interconnected with each other and are used to connect the first working chamber with the second auxiliary piston and / or the second working chamber with the first auxiliary piston.

[0012] Vibration damper, including any of the linear damping devices described above.

[0013] The beneficial effects of this utility model are as follows: The linear damping device and vibration damper provided by this utility model achieve the purpose of highly linearly adjustable damping and noise control through a multi-stage valve group and a split-flow piston structure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the flow divider piston of this utility model. Figure 1 .

[0017] Figure 3 This is a schematic diagram of the flow divider piston of this utility model. Figure 2 .

[0018] Figure 4 This is the utility model Figure 1 A sectional view.

[0019] Figure 5 This is a schematic diagram of the structure of the auxiliary piston (hidden valve assembly) of this utility model.

[0020] Figure 6 This is a schematic diagram of the throttling valve plate in the third valve group of this utility model.

[0021] Figure 7 This is a schematic diagram of the assembly of the valve gasket and the auxiliary piston in the third valve assembly of this utility model. Figure 1 .

[0022] Figure 8 This is a schematic diagram of the assembly of the valve gasket and the auxiliary piston in the third valve assembly of this utility model. Figure 2 .

[0023] Figure 9 This is a schematic diagram of the flow path of the liquid during the stretching / compression motion at low speed, according to this utility model.

[0024] Figure 10 This is a schematic diagram of the flow path of the liquid during the stretching / compression motion at medium or medium-high speeds according to this invention.

[0025] Figure 11 This is the damping characteristic curve of this utility model.

[0026] Figure 12 It is the damping characteristic curve of existing technology. Detailed Implementation

[0027] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. The above description is for the purpose of simplifying the description of this utility model and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0028] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0029] In the specification, when an element is described as being "on," "fixed" to, "connected" to, or "joined" to another element, the element may be directly located on, fixed to, connected to, joined to, or in contact with the other element, or there may be an intermediate element present. In the specification, the description of a feature being arranged "adjacent" to another feature may refer to a feature having a portion that overlaps with the adjacent feature or a portion located above or below the adjacent feature.

[0030] It is understood that although the terms "first," "second," etc., may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. Therefore, a first element may be referred to as a second element without departing from the teachings of this application.

[0031] Exemplary embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that this application can be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments. Throughout the drawings, the same reference numerals denote the same or functionally identical elements.

[0032] Figure 1The diagram illustrates this linear damping device, which includes a diverter piston 100 sleeved on a piston rod 1 and a first auxiliary piston 200 and a second auxiliary piston 300 disposed on both sides of the diverter piston 100 in the axial direction of motion. The auxiliary piston in each direction, in conjunction with the diverter piston 100, enables the damping device to have at least three linearly adjustable damping characteristics in one direction of motion.

[0033] Figure 2 and Figure 3 The overall structure of the flow-dividing piston is shown, including a main piston ring 106 arranged on the outer periphery to divide the inner cavity of the shock absorber into a first working chamber 100a and a second working chamber 100b. A first flow channel 103 and a second flow channel 102 are formed on the flow-dividing piston 100 to connect the first working chamber 100a and the second working chamber 100b and to cooperate with a valve assembly to achieve unidirectional flow control. The first flow channel 103 and the second flow channel 102 are arranged circumferentially with the piston rod through hole 101 as a circle. An annular step 104 is provided between the first flow channel 103 and the second flow channel 102 to cooperate with the first auxiliary piston 200 to achieve flow rectification by arranging opposing flow directions in radial space. Multiple ports 105 are arranged on one side of the diverting piston 100 and the second auxiliary piston 300. Ports 105 are connected to the second flow channel 102. When the damping device moves towards the second auxiliary piston 300 (in the direction of the second working chamber 100b), liquid enters the second flow channel 102 from the ports 105 and interacts with the first auxiliary piston 200 to produce a damping effect. Similarly, when the damping device moves towards the first auxiliary piston 200 (in the direction of the first working chamber 100a), liquid interacts with the second auxiliary piston 300 from the first flow channel 103 to produce a damping effect. The diverting piston 100 plays a role in converging and diverting flow during the movement of the damping device.

[0034] Figures 4 to 8 The specific structure of the auxiliary pistons is shown. The structures of the first auxiliary piston 200 and the second auxiliary piston 300 are basically the same. Specifically, the flow rate entering the first auxiliary piston 200 and the second auxiliary piston 300 from the diversion piston 100 is mainly controlled by the third valve group 220 and 330, while the flow rate exiting the first auxiliary piston 200 and the second auxiliary piston 300 is controlled by the first valve group 240 and 340 and the second valve group 250 and 350. The damping effect in both directions of motion (tension / compression) of the damping device is achieved by changing the assembly direction of the auxiliary pistons.

[0035] Therefore, the first auxiliary piston 200 will be shown below. Specifically, the third valve group 220 is disposed on the adjacent side of the first auxiliary piston 200 and the diverting piston 100. Correspondingly, a flow channel 214 is provided on the side of the first auxiliary piston 200 and the diverting piston 100, which acts as a throttle valve to control the initial flow rate entering the first auxiliary piston 200 from the diverting piston side. The first valve group 240 and the second valve group 250 are located at the rear end of the flow path of the first auxiliary piston 200 relative to the third valve group 220. The second valve group 250 is arranged on the outer flange 211 of the auxiliary piston 210, and the first valve group 240 is arranged on the annular step 213. The height of the outer flange 211 is significantly higher than that of the annular step 213, so that the first valve group 240 and the second valve group 250 are configured progressively. The second valve group 250 is only pushed open after the first valve group 240 is pushed open and the flow rate further reaches the threshold. Therefore, the first valve group 240 and the second valve group 250 are configured as elastic valve plate groups. The elastic modulus of the first valve group 240 and the second valve group 250 is the damping adjustment control point of the first valve group 240 and the second valve group 250.

[0036] Furthermore, the first auxiliary piston 300 and the diverter piston 100 are coupled. The second valve assembly 250 is an elastic valve assembly with a disc spring, which elastically presses the first auxiliary piston 300 and the diverter piston 100 together. Therefore, when the liquid flows through the first valve assembly 240 and the second valve assembly 250 too fast, the first auxiliary piston 200 and the diverter piston 100 will momentarily separate, and some liquid will enter the first working chamber 100a without flowing through the first valve assembly 240 and the second valve assembly 250, thus achieving protective pressure relief.

[0037] Furthermore, the third valve assembly 220 consists of a throttling valve plate 230 and a valve pad 221. The throttling valve plate 230 is positioned adjacent to the first auxiliary piston 200 and the diverting piston 100 as the primary control of the flow rate of the third valve assembly 220. The valve pad 221 is positioned at the center of the first auxiliary piston 200 as the secondary control. The throttling orifices 231 and 222 are the damping adjustment control points of the third valve assembly 220. Liquid flows through the throttling orifices 231 and 222 between the throttling valve plate 230 and the valve pad 221 and the first auxiliary piston 200. Since the first auxiliary piston 200 and the valve pad 221 are separate components, the valve pad 221 is used to cooperate with the components being fixed on the piston rod 1, while the first auxiliary piston 200 can move axially relative to each other, in order to achieve the aforementioned protective pressure relief function.

[0038] In some embodiments, the first valve assembly 240 is configured to have a throttling valve structure to further control the damping performance of the first valve assembly 240 at low speeds.

[0039] In some embodiments, the second valve assembly 250 is configured to have a throttling valve structure to further control the damping performance of the second valve assembly 250 at low speeds.

[0040] In some embodiments, the outer flange 211 of the first auxiliary piston 200 is provided with an interface 211 to further control the damping performance of the second valve group 250 at low speeds.

[0041] Figure 9 The diagram illustrates the flow path of the liquid when the damping device is in low-speed tensile / compression motion. Taking the movement of the damping device toward the first auxiliary piston 200 as an example, the liquid enters the diversion piston 100 from the first flow channel 103, passes through the throttling orifice 331 and throttling orifice 321 of the third valve group 320 in sequence, and finally flows out through the throttling orifices on the first valve group 340 and the second valve group 350 and / or the interface 212 on the second auxiliary piston 210. When the damping device moves toward the second auxiliary piston 300, the difference is that the liquid enters the diversion piston 100 from the interface 105, moves upward along the second flow channel 102, passes through the third valve group 220, and enters the first auxiliary piston 200.

[0042] Figure 10 The diagram illustrates the flow path of liquid when the damping device is in medium-speed or medium-high-speed tensile / compression motion, using the movement of the damping device towards the first auxiliary piston 200 as an example. When the damping device moves at medium speed, the first valve group 240 opens to increase the flow rate. When the damping device moves at medium-high speed, the second valve group 250 opens to increase the flow rate. When the movement speed is too fast and the first valve group 240 approaches its upper limit, the disc spring in the second valve group 250 undergoes elastic deformation, and the first auxiliary piston 200 follows the movement, separating from the diverter piston 100 to achieve protective pressure relief.

[0043] Combination Figure 11 and Figure 12 As shown, this solution utilizes a damping device composed of a flow-diverting piston 100 and an auxiliary piston, along with a multi-stage valve system, to achieve linear damping adjustment at low, medium, and high speeds. Compared to existing technologies with only one valve opening adjustment point, this invention allows for 2-3 adjustable speed points on a set of damping parameters, with each speed point increasing damping by 3-5 times, avoiding abrupt damping changes in traditional valve systems. Simultaneously, a disc spring accelerates the valve system's commutation speed, reducing resonance and impact noise. The split design between pistons enables overpressure and pressure relief, extending component lifespan.

Claims

1. A linear damping device, characterized in that, It includes a flow divider piston sleeved on a piston rod and a pair of auxiliary pistons respectively disposed at both ends of the flow divider piston and coupled thereto, the pair of auxiliary pistons providing damping in two opposing directions of motion.

2. The linear damping device as described in claim 1, characterized in that, The auxiliary piston is press-coupled to the diverter piston via an elastic element and separates to release pressure in case of overspeed or overload.

3. The linear damping device as described in claim 2, characterized in that, The auxiliary piston includes a third valve group located on one side of the diverter piston for controlling the flow rate between the diverter piston and the auxiliary piston; and a first valve group and a second valve group located at the rear end of the flow path, respectively, relative to the third valve group.

4. The linear damping device as described in claim 3, characterized in that, The first valve group and the second valve group are composite elastic valve groups with through-hole throttling structures.

5. The linear damping device as described in claim 4, characterized in that, The elastic element is a disc spring disposed within the second valve assembly.

6. The linear damping device as described in claim 3, characterized in that, The third valve assembly includes a throttling valve plate disposed between the auxiliary piston and the diverting piston, and a valve pad located in the center of the auxiliary piston. The auxiliary piston and the valve pad are separate components.

7. The linear damping device according to any one of claims 3 to 5, characterized in that, The auxiliary piston includes a first auxiliary piston and a second auxiliary piston, which are respectively mirror images disposed at both ends of the flow divider piston.

8. The linear damping device as described in claim 7, characterized in that, The flow divider piston is provided with a first flow channel and a second flow channel that are not interconnected with each other and are used to connect the first working chamber with the second auxiliary piston and / or the second working chamber with the first auxiliary piston.

9. A vibration damper, characterized in that, Includes the linear damping device as described in any one of claims 1 to 8.

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