Shock absorber

Abstract

The shock absorber comprises a cylinder barrel and a piston assembly, the piston assembly divides the cylinder barrel into a rod cavity and a rodless cavity, and a control oil cavity, a valve element, a first oil way, an armature device and an elastic piece are arranged in the piston assembly; valves are arranged between the control oil cavity and the rod cavity and between the control oil cavity and the rodless cavity; the valve element makes contact with oil in the control oil cavity, and the valve element can move between a first position and a second position in the axial direction under the action of oil pressure in the control oil cavity. The armature device is arranged corresponding to the second port of the first oil duct; the elastic piece acts on the armature device, and under the elastic force effect of the elastic piece, the armature device blocks the second port. According to the shock absorber, when the current flowing through the solenoid is zero due to a fault, large damping force can be achieved, and the damping force can be adjusted.

Description

Technical Field

[0001] The invention relates to a shock absorber. Background Art

[0002] The shock absorber is an important component of the vehicle chassis system, which can effectively buffer the vibration of the vehicle chassis. The shock absorber includes a cylinder, a piston assembly, and a piston rod connected to the piston assembly. The piston assembly is in a sealed fit with the inner wall of the cylinder, thereby dividing the space of the cylinder into a first working space and a second working space, and the piston rod is located in one of the working spaces. The piston assembly includes a piston body, a valve group connected to the piston body, and an oil circuit arranged on the piston body.

[0003] The oil circuit can connect the first working space and the second working space, and the valve group is used to control the opening and closing of the oil circuit. When the piston body moves up and down in the cylinder, the valve group controls the oil in the first working space and the second working space to flow back and forth through the oil circuit. At this time, the oil in the oil circuit will damp the movement of the piston body, thereby playing a role in shock absorption.

[0004] The valve group includes a solenoid valve structure, which includes a solenoid and a valve core. A magnetic field force can be formed by passing an electric current through the solenoid, and under the action of the magnetic field force, the valve core forms a certain damping force on the oil.

[0005] In order to avoid the problem that the current flowing through the solenoid is zero due to a fault, resulting in the failure of the shock absorber, a piston assembly in the prior art includes a spring, which pushes the side armature to form a certain damping force on the flow of oil, that is, the damping force is controlled by the spring force.

[0006] However, in the prior art, the damping force is controlled by the elastic force of the spring, and the damping force is too small and cannot be adjusted. Summary of the invention

[0007] An object of the present invention is to provide a shock absorber which can achieve a large damping force and an adjustable damping force when a fault causes the current flowing through the solenoid to be zero.

[0008] A shock absorber provided by the present invention comprises a cylinder and a piston assembly, wherein the piston assembly divides the cylinder into a rod chamber and a rodless chamber, and a control oil chamber, a valve core, a first oil passage, an armature device and an elastic member are arranged inside the piston assembly; wherein,

[0009] Valves are provided between the control oil chamber and the rod chamber and the rodless chamber;

[0010] The valve core is in contact with the oil in the control oil chamber, and the valve core can be displaced axially between a first position and a second position under the action of the oil pressure in the control oil chamber;

[0011] The first port of the first oil passage is connected to the control oil chamber, and the valve core closes the first port when the valve core is in the first position, and the first port is connected to the control oil chamber when the valve core is in the second position;

[0012] The armature device is arranged corresponding to the second port of the first oil channel;

[0013] The elastic member acts on the armature device, and under the elastic force of the elastic member, the armature device is blocked at the second port.

[0014] According to the shock absorber provided by the present invention,

[0015] The piston assembly comprises an annular block having a hollow portion, and the annular block is sleeved on the outer periphery of the valve core; the first oil passage is arranged in the annular block.

[0016] According to the shock absorber provided by the present invention, there are a plurality of first oil passages, and the plurality of first oil passages are evenly distributed along the circumference of the annular block.

[0017] According to the shock absorber provided by the present invention, each of the first oil channels includes a radial section and an axial section, one end of the radial section corresponds to the valve core, the other end is connected to one end of the axial section, and the other end of the axial section corresponds to the armature device.

[0018] According to the shock absorber provided by the present invention, a groove structure is provided at one end of the armature device facing away from the first oil channel, the elastic member is configured as a spring, and the spring is disposed in the groove structure.

[0019] According to the shock absorber provided by the present invention, the piston assembly comprises a wear-resistant magnetic isolation body, the wear-resistant magnetic isolation body is configured as a cylindrical structure, and the armature device is slidably sleeved in the wear-resistant magnetic isolation body along the axial direction.

[0020] According to the shock absorber provided by the present invention, the wear-resistant magnetic isolation body comprises a glass fiber cloth base layer, and the surface of the glass fiber cloth base layer is coated with a wear-resistant magnetic isolation material.

[0021] According to the shock absorber provided by the present invention, the wear-resistant magnetic isolation material includes polytetrafluoroethylene.

[0022] According to the shock absorber provided by the present invention, a first oil circuit, a second oil circuit, a third oil circuit and a fourth oil circuit are arranged in the piston assembly, wherein one end of the first oil circuit and the second oil circuit are connected to the rod chamber, the other end of the first oil circuit is connected to the control oil chamber, and the other end of the second oil circuit is connected to the second port of the first oil channel; one end of the third oil circuit and the fourth oil circuit are connected to the rodless chamber, the other end of the third oil circuit is connected to the control oil chamber, and the other end of the fourth oil circuit is connected to the second port of the first oil channel.

[0023] According to the shock absorber provided by the present invention, the valve includes a first one-way valve and a third one-way valve, and the piston assembly also includes a second one-way valve and a fourth one-way valve, wherein the first one-way valve, the second one-way valve, the third one-way valve and the fourth one-way valve are respectively arranged in one-to-one correspondence with the first oil circuit, the second oil circuit, the third oil circuit and the fourth oil circuit;

[0024] When the oil pressure in the rod chamber is greater than the oil pressure in the control oil chamber, and the oil pressure in the control oil chamber is greater than the oil pressure in the rodless chamber, the first one-way valve and the fourth one-way valve are connected; when the oil pressure in the rodless chamber is greater than the oil pressure in the control oil chamber, and the oil pressure in the control oil chamber is greater than the oil pressure in the rod chamber, the third one-way valve and the second one-way valve are connected.

[0025] The shock absorber provided by the present invention comprises a cylinder and a piston assembly. It should be noted that the piston assembly comprises a piston body, a piston ring, various valve structures connected to the piston body, and other components connected to the piston body and reciprocating with the piston body. The piston assembly is connected to the piston rod through a connecting structure, and the piston assembly divides the cylinder into a rod chamber and a rodless chamber. A control oil chamber, a valve core, a first oil passage, an armature device and an elastic member are arranged inside the piston assembly, wherein valves are arranged between the control oil chamber and the rod chamber and the rodless chamber; the valve core contacts the oil in the control oil chamber, and the valve core can be displaced axially between a first position and a second position under the action of the oil pressure in the control oil chamber; the first port of the first oil passage is connected to the control oil chamber, and the valve core closes the first port when in the first position, and the first port is connected to the control oil chamber when in the second position; the armature device is arranged correspondingly to the second port of the first oil passage; the elastic member acts on the armature device, and under the elastic force of the elastic member, the armature device is blocked at the second port. With such a configuration, when the current is zero, if the piston assembly is in the rebound stroke (the piston is displaced from the rodless chamber to the rod chamber), after the pressure oil in the rod chamber enters the control oil chamber through the valve, the valve core is displaced from the first position to the second position under the action of the oil pressure, and the oil enters the first oil channel. Then, under the action of the oil pressure, the elastic force of the elastic member is overcome to push the armature device open. After the oil pushes the armature device open, it can enter the rodless chamber through the oil path in the piston assembly, thereby achieving a damping effect. Similarly, if the piston assembly is in the compression stroke (the piston is displaced from the rod chamber to the rodless chamber), after the pressure oil in the rodless chamber enters the control oil chamber through the valve, it can also first push the valve core to move through the same path, then push the armature device open, and finally enter the rod chamber through the oil path in the piston assembly. It should be noted that the oil pressure entering the control oil chamber in the present invention needs to lift the valve core and then overcome the elastic force of the elastic part to push the armature device before it can release the pressure, thereby achieving a larger damping force. At the same time, during the design, the damping force can be adjusted within a larger range by changing the number and diameter of the first oil channel or the preload force of the elastic part, thereby meeting the damping force design requirements to a greater extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view showing a shock absorber according to an embodiment of the present invention.

[0027] Figure 2 is a schematic diagram of a ring block according to an embodiment of the present invention.

[0028] Figure 3 2 is a cross-sectional view showing the matching structure between the armature device and the annular block according to an embodiment of the present invention.

[0029] Figure 4 Schematic diagram of a wear-resistant magnetic separator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following detailed description and drawings are used to illustrate the principle of the present invention. The present invention is not limited to the preferred embodiments described. The protection scope of the present invention is defined by the claims.

[0031] It should be noted that the orientations or positional relationships indicated in this specification are based on the orientations or positional relationships described in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device referred to must have a specific orientation or be constructed in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0032] Please refer to Figure 1-Figure 4 The shock absorber provided in this embodiment includes a cylinder and a piston assembly 1. The piston assembly 1 includes a piston body and other valves, a solenoid, an armature device 24 and other components arranged on the piston body. The piston body and the cylinder are sealed and the piston body can slide along the axial direction of the cylinder. The piston body divides the cylinder into a rod chamber and a rodless chamber. The piston assembly 1 is provided with a control oil chamber 11, a valve core 15, a first oil passage 23, an armature device 24 and an elastic member 25.

[0033] In this embodiment, valves are provided between the control oil chamber 11 and both the rod chamber and the rodless chamber. In some embodiments, the valve is designed as a one-way valve, and the valve between the control oil chamber 11 and the rod chamber is a first one-way valve 12, which opens when the oil pressure in the rod chamber is greater than the oil pressure in the control oil chamber 11; the valve between the control oil chamber 11 and the rodless chamber is a third one-way valve 13, which opens when the oil pressure in the rodless chamber is greater than the oil pressure in the control oil chamber 11.

[0034] The valve core 15 is in contact with the oil in the control oil chamber 11, and the valve core 15 can be displaced axially between the first position and the second position under the action of the oil pressure in the control oil chamber 11. It should be noted that when the solenoid is supplied with current, the valve core 15 is affected by the electromagnetic force. When the current supplied to the solenoid is zero, the solenoid no longer generates a magnetic field, and the valve core 15 is no longer affected by the electromagnetic force. In some embodiments, the valve core 15 can be arranged in a vertical direction. When the current of the solenoid is zero, and when the force exerted on the valve core 15 by the oil in the control oil chamber 11 is less than the weight of the valve core 15, the valve core 15 is maintained in the first position under the action of its own weight. When the force exerted on the valve core 15 by the oil in the control oil chamber 11 is greater than the self-weight of the valve core 15, the valve core 15 rises in the vertical direction from the first position to the second position.

[0035] The first oil passage 23 may be provided in one or more portions, and the first port of each first oil passage 23 is connected to the control oil chamber 11, and the valve core 15 closes the first port when it is in the first position, and the first port is connected to the control oil chamber 11 when it is in the second position. It should be noted that the first ports of the plurality of first oil passages 23 surround the outer peripheral position of the valve core 15, and when the valve core 15 is kept in the first position under the action of gravity, the valve core 15 closes the first port of each first oil passage 23. When the valve core 15 is displaced from the first position to the second position under the action of oil pressure, the oil in the control oil chamber 11 enters the first oil passage 23 from the first port.

[0036] The armature device 24 is disposed corresponding to the second port of each first oil passage 23 , and the elastic member 25 acts on the armature device 24 , and under the elastic force of the elastic member 25 , the armature device 24 is blocked at the second port.

[0037] It should be noted that when the current of the solenoid is zero, and when the piston assembly 1 moves from the rodless chamber to the rod chamber, that is, when the piston assembly 1 is in the rebound stroke, the oil pressure in the rod chamber increases, and the oil pressure in the rod chamber is greater than the oil pressure in the control oil chamber 11, and the oil pressure in the control oil chamber 11 is greater than the oil pressure in the rodless chamber. At this time, the oil enters the control oil chamber 11 through the first one-way valve 12, and the oil pressure in the control oil chamber 11 overcomes the gravity of the valve core 15, pushing the valve core 15 up to the second position, and then the oil enters the first oil channel 23, and overcomes the elastic force of the elastic member 25 under the action of the oil pressure to push the armature device 24 up, and then the oil can be decompressed into the rodless chamber. Similarly, if the piston assembly 1 is in the compression stroke, that is, the piston moves from the rod chamber to the rodless chamber, when the pressure oil in the rodless chamber enters the control oil chamber 11 through the valve, it can also push the armature device 24 open through the same path, and then enter the rod chamber through the oil path in the piston assembly 1. It should be noted that, in this embodiment, the oil pressure entering the control oil chamber 11 needs to lift the valve core 15 and then overcome the elastic force of the elastic member 25 to push the armature device 24 before it can release the pressure, thereby achieving a larger damping force. At the same time, during the design, the damping force can be adjusted within a larger range by changing the number and diameter of the first oil channels 23 or the preload force of the elastic member 25, thereby meeting the damping force design requirements to a greater extent.

[0038] In order to increase the damping force, in a further embodiment, the piston assembly 1 includes an annular block 26 having a hollow portion, the annular block 26 is sleeved on the outer periphery of the valve core 15, and a plurality of first oil passages 23 are arranged in the annular block 26. In this arrangement, by increasing the number or diameter of the first oil passages 23 on the annular block 26, the damping force when the current is zero can be effectively increased.

[0039] In order to more effectively adjust the damping force, in some embodiments, the first oil passage 23 can be provided in plurality and can be evenly distributed along the circumference of the annular block 26. Such a configuration can increase the adjustment range of the damping force. In addition, it should be noted that in this embodiment, the diameter of the first oil passage 23 can be changed to achieve a more flexible effect of adjusting the damping force.

[0040] In order to improve the matching stability between the spring device and the armature device 24, further, a groove structure is provided at one end of the armature device 24 facing away from the first oil channel 23, and the elastic member 25 is provided as a spring, which is provided in the groove structure. Under the limiting action of the groove structure, the relative misalignment between the spring and the armature device 24 can be limited, thereby improving the stability between the two.

[0041] In a further embodiment, the piston assembly 1 includes a wear-resistant magnetic isolation body 27, which is configured as a cylindrical structure, and the armature device 24 is slidably sleeved in the wear-resistant magnetic isolation body 27 along the axial direction, and the wear-resistant magnetic isolation body 27 has the functions of radial magnetic isolation and wear resistance. When the current is a low damping current, the armature device 24 overcomes the spring force and moves in the axial direction to open the first oil passage 23. By adding the wear-resistant magnetic isolation body 27, the armature device 24 is isolated from the parts on the magnetic circuit to form a uniform magnetic isolation layer, thereby effectively reducing the magnetic force on the armature device 24 in the radial direction, reducing the friction force, and improving the response speed of the armature.

[0042] In a further embodiment, the wear-resistant magnetic isolating body 27 comprises a fiberglass cloth base layer, the surface of which is coated with a wear-resistant magnetic isolating material. The fiberglass cloth base layer can provide effective support and low friction due to the wear-resistant magnetic isolating material coated on the surface.

[0043] In a further embodiment, the wear-resistant magnetic isolation material includes polytetrafluoroethylene or other polymer materials with equivalent effects.

[0044] In another embodiment of the present invention, a first oil circuit, a second oil circuit 17, a third oil circuit 14 and a fourth oil circuit 19 are provided in the piston assembly 1. One end of the first oil circuit and the second oil circuit 17 is communicated with the rod chamber, the other end of the first oil circuit is communicated with the control oil chamber 11, and the other end of the second oil circuit 17 is communicated with the second port of the first oil passage 23; one end of the third oil circuit 14 and the fourth oil circuit 19 is communicated with the rodless chamber, the other end of the third oil circuit 14 is communicated with the control oil chamber 11, and the other end of the fourth oil circuit 19 is communicated with the second port of the first oil passage 23.

[0045] The valve includes a first one-way valve 12 and a third one-way valve 13, and the piston assembly 1 also includes a second one-way valve 18 and a fourth one-way valve 20. The first one-way valve 12, the second one-way valve 18, the third one-way valve 13 and the fourth one-way valve 20 are respectively arranged in a one-to-one correspondence with the first oil circuit, the second oil circuit 17, the third oil circuit 14 and the fourth oil circuit 19.

[0046] When the oil pressure in the rod chamber is greater than the oil pressure in the control oil chamber 11, and the oil pressure in the control oil chamber 11 is greater than the oil pressure in the rodless chamber, the first one-way valve 12 and the fourth one-way valve 20 are connected; when the oil pressure in the rodless chamber is greater than the oil pressure in the control oil chamber 11, and the oil pressure in the control oil chamber 11 is greater than the oil pressure in the rod chamber, the third one-way valve 13 and the second one-way valve 18 are connected.

[0047] It should be noted that when the piston assembly 1 moves from the rodless chamber to the rod chamber, that is, when the piston assembly 1 is in the rebound stroke, the oil pressure in the rod chamber increases, the oil pressure in the rod chamber is greater than the oil pressure in the control oil chamber 11, and the oil pressure in the control oil chamber 11 is greater than the oil pressure in the rodless chamber. At this time, the first one-way valve 12 and the fourth one-way valve 20 are connected, and the oil in the rod chamber enters the rodless chamber through the first oil circuit, the control oil chamber 11, and the fourth oil circuit 19 in turn, thereby being able to play a rebound damping effect.

[0048] When the piston assembly 1 moves from the rod chamber to the rodless chamber, that is, when the piston assembly 1 is in the compression stroke, the oil pressure in the rodless chamber increases, the oil pressure in the rodless chamber is greater than the oil pressure in the control oil chamber 11, and the oil pressure in the control oil chamber 11 is greater than the oil pressure in the rod chamber. At this time, the third one-way valve 13 and the second one-way valve 18 are connected, and the oil in the rodless chamber enters the rod chamber through the third oil circuit 14, the control oil chamber 11, and the second oil circuit 17 in turn, thereby being able to play a damping effect.

[0049] In addition, it should be noted that the oil circuits in this embodiment have simple structures and will not interfere with each other.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0051] Reference numerals list

[0052] 1: piston assembly; 11: control oil chamber; 12: first one-way valve; 13: third one-way valve; 14: third oil circuit; 15: valve core; 17: second oil circuit; 18: second one-way valve; 19: fourth oil circuit; 20: fourth one-way valve; 21: radial section; 22: axial section; 23: first oil channel; 24: armature device; 25: elastic member; 26: annular block; 27: wear-resistant isolation magnet.

Claims

1. A shock absorber, comprising a cylinder and a piston assembly (1), wherein the piston assembly (1) divides the cylinder into a rod chamber and a rodless chamber, and the piston assembly (1) is provided with a control oil chamber (11), a valve core (15), a first oil passage (23), an armature device (24) and an elastic member (25); wherein: Valves are provided between the control oil chamber (11) and the rod chamber and the rodless chamber; The valve core (15) is in contact with the oil in the control oil chamber (11), and the valve core (15) can be displaced axially between a first position and a second position under the action of the oil pressure in the control oil chamber (11); The first port of the first oil passage (23) is connected to the control oil chamber (11), and the valve core (15) closes the first port when it is in the first position, and the first port is connected to the control oil chamber (11) when it is in the second position; The armature device (24) is arranged corresponding to the second port of the first oil passage (23); The elastic member (25) acts on the armature device (24), and under the elastic force of the elastic member (25), the armature device (24) is blocked at the second port.

2. The shock absorber according to claim 1, wherein: The piston assembly (1) comprises an annular block (26) having a hollow portion, wherein the annular block (26) is sleeved on the outer periphery of the valve core (15); and the first oil passage (23) is arranged in the annular block (26).

3. The shock absorber according to claim 2, wherein: There are a plurality of the first oil passages (23), and the plurality of the first oil passages (23) are evenly distributed along the circumference of the annular block (26).

4. The shock absorber according to claim 3, wherein: Each of the first oil passages (23) comprises a radial section (21) and an axial section (22); one end of the radial section (21) corresponds to the valve core (15), and the other end is connected to one end of the axial section (22); and the other end of the axial section (22) corresponds to the armature device (24).

5. The shock absorber according to claim 1, wherein: A groove structure is provided at one end of the armature device (24) facing away from the first oil channel (23), and the elastic member (25) is configured as a spring, which is disposed in the groove structure.

6. The shock absorber according to claim 1, wherein: The piston assembly (1) comprises a wear-resistant isolating magnet (27), the wear-resistant isolating magnet (27) being arranged as a cylindrical structure, and the armature device (24) being slidably sleeved in the wear-resistant isolating magnet (27) along the axial direction.

7. The shock absorber according to claim 6, wherein: The wear-resistant magnetic isolation body (27) comprises a glass fiber cloth base layer, and the surface of the glass fiber cloth base layer is coated with a wear-resistant magnetic isolation material.

8. The shock absorber according to claim 7, wherein: The wear-resistant magnetic isolation material includes polytetrafluoroethylene.

9. The shock absorber according to any one of claims 1 to 8, wherein: The piston assembly (1) is provided with a first oil circuit, a second oil circuit (17), a third oil circuit (14) and a fourth oil circuit (19), wherein: One end of the first oil circuit and the second oil circuit (17) are connected to the rod chamber, the other end of the first oil circuit is connected to the control oil chamber (11), and the other end of the second oil circuit (17) is connected to the second port of the first oil channel (23); one end of the third oil circuit (14) and the fourth oil circuit (19) are connected to the rodless chamber, the other end of the third oil circuit (14) is connected to the control oil chamber (11), and the other end of the fourth oil circuit (19) is connected to the second port of the first oil channel (23).

10. The shock absorber according to claim 9, wherein: The valve comprises a first one-way valve (12) and a third one-way valve (13), and the piston assembly (1) further comprises a second one-way valve (18) and a fourth one-way valve (20), wherein the first one-way valve (12), the second one-way valve (18), the third one-way valve (13) and the fourth one-way valve (20) are respectively arranged in a one-to-one correspondence with the first oil circuit, the second oil circuit (17), the third oil circuit (14) and the fourth oil circuit (19); When the oil pressure in the rod chamber is greater than the oil pressure in the control oil chamber (11), and the oil pressure in the control oil chamber (11) is greater than the oil pressure in the rodless chamber, the first one-way valve (12) and the fourth one-way valve (20) are connected; when the oil pressure in the rodless chamber is greater than the oil pressure in the control oil chamber (11), and the oil pressure in the control oil chamber (11) is greater than the oil pressure in the rod chamber, the third one-way valve (13) and the second one-way valve (18) are connected.

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