A damper

Abstract

The present application relates to a damper, which relates to the field of dampers, and includes a cylinder, a damper joint, an oil seal, a piston rod and a piston system. The piston system divides the cylinder into two oil chambers. The piston rod passes through the oil seal and out of the cylinder. A groove is provided on the side wall of the cylinder. The piston system includes a piston ring and a pressure relief assembly. The groove and the outer ring wall of the piston ring enclose an oil passage for the exchange of hydraulic oil in the two oil chambers. The pressure relief assembly and the piston ring enclose a pressure relief passage for the exchange of hydraulic oil in the two oil chambers. The pressure relief assembly includes a pressure relief piston and a positioning member. The pressure relief piston is provided with an oil hole for the exchange of hydraulic oil in the two oil chambers. A sealing member for controlling the opening and closing of the oil hole on the pressure relief piston is provided between the pressure relief piston and the damping gasket. The present application has the effect of matching different damping forces according to the force applied to the piston rod to achieve a soft opening and closing feel.

Description

Technical Field

[0001] The present application relates to the field of dampers, and in particular to a damper. Background Art

[0002] A damper is a device that provides resistance to movement and dissipates the energy of movement. It has a wide range of applications, such as the opening and closing of the central armrest of a car on the market, and the need for a safe damping force when the seat back needs to be folded down to ensure a slow descent while ensuring a good operating feel throughout the entire process.

[0003] There are three common methods used on the market to provide damping force: 1. Using plastic bushings or corrugated gaskets to compress and generate friction damping force; 2. Using mechanical coil springs to provide damping force; 3. Using pure gas springs to provide downward damping force.

[0004] However, the above method has a poor hand feel and cannot achieve the effect of soft opening or closing. Utility Model Content

[0005] In order to improve the above problems, the present application provides a damper.

[0006] A damper provided in this application adopts the following technical solution:

[0007] A damper is used in the field of automobile manufacturing, especially for vehicle seat backs and central armrest brackets, characterized in that it comprises a cylinder, a damper joint arranged at one end of the cylinder, an oil seal block arranged at the other end of the cylinder, a piston rod coaxially arranged in the cylinder, and a piston system, wherein the piston system divides the cylinder into two oil chambers, the piston rod passes through the oil seal block and passes out of the cylinder, a groove is provided on the side wall of the cylinder, the piston system comprises a piston ring and a pressure relief assembly arranged at one end of the piston rod near the damper joint, the groove and the outer ring wall of the piston ring enclose an oil passage for exchanging hydraulic oil in the two oil chambers;

[0008] The pressure relief assembly and the piston ring enclose a pressure relief channel for the hydraulic oil to be exchanged in the two oil chambers. The pressure relief assembly includes a pressure relief piston sleeved on the piston rod and a positioning member for positioning the pressure relief piston. The pressure relief piston is provided with an oil hole for the hydraulic oil to be exchanged in the two oil chambers.

[0009] A sealing member for controlling the opening and closing of the oil hole on the pressure relief piston is arranged between the pressure relief piston and the damping gasket.

[0010] Furthermore, the piston ring and the inner wall of the cylinder are interference fit.

[0011] Furthermore, the positioning member includes a fixing ring, a damping gasket and a supporting gasket which are sleeved on the piston rod, the fixing ring and the supporting gasket are both fixedly connected to the piston rod, the pressure relief piston is arranged between the fixing ring and the supporting gasket, and the damping gasket is arranged between the fixing ring and the pressure relief piston.

[0012] Furthermore, the blocking member comprises an elastic damping valve plate sleeved on the piston rod, the damping gasket presses the damping valve plate onto the pressure relief piston, and the damping valve plate is used to block the oil hole of the pressure relief piston.

[0013] Furthermore, the blocking member includes a blocking piece and a spring, the spring is sleeved on the piston rod, one end of the spring is connected to the damping gasket, and the other end of the spring is connected to the blocking piece, and the blocking piece is used to block the oil hole of the pressure relief piston.

[0014] Furthermore, an elastic bushing for connecting to the vehicle seat backrest or the central armrest bracket is provided at the end of the piston rod away from the cylinder.

[0015] Furthermore, a separation piston is arranged in the cylinder, and the separation piston is arranged between the damper joint and the piston rod, and an air cavity is enclosed between the separation piston and the damper joint.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] 1. When the piston rod moves away from the damper joint, the hydraulic oil pressure in the oil chamber near one end of the oil sealing block increases, and the hydraulic oil moves from the oil passage to the direction close to the damper joint. When the piston rod moves faster, the higher the speed, the greater the pressure of the hydraulic oil passing through the oil passage, and the greater the damping force. When the speed of the hydraulic oil exceeds the threshold, the hydraulic oil pushes the damping valve plate or the sealing plate open. At this time, the pressure relief channel is connected, and the hydraulic oil flows in both the oil passage and the pressure relief channel, increasing the cross-sectional area of ​​the hydraulic oil through hole, which is conducive to reducing the problem of poor feel caused by too fast changes in the hydraulic oil pressure in the oil chamber when the piston rod moves violently, and trying to avoid the problem of damage to the damper joint caused by excessive pressure;

[0018] 2. Using a separation piston to separate the air chamber and the oil chamber is helpful to reduce the sound of gas bursting when there is gas in the cylinder through the oil channel, thereby achieving a noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a damper in Example 1 of the present application.

[0020] Figure 2 for Figure 1 Section view of the AA plane.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 This is a schematic diagram of the overall structure of a damper in Example 2 of the present application.

[0023] Figure 5 for Figure 4 Sectional view of the BB plane.

[0024] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0025] Explanation of the accompanying drawings: 1. Cylinder; 2. Damper joint; 3. Oil sealing block; 4. Piston system; 41. Piston ring; 42. Pressure relief assembly; 5. Piston rod; 6. Positioning piece; 61. Fixing ring; 62. Damping gasket; 63. Support gasket; 7. Sealing piece; 71. Damping valve plate; 72. Spring; 73. Sealing plate; 8. Pressure relief piston; 9. Oil chamber; 10. Groove; 11. Oil passage; 12. Oil hole; 13. Stepped shaft; 14. Shoulder; 15. Pressure relief passage; 16. Elastic bushing; 17. Separation piston; 18. Air chamber. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-6 This application is described in further detail.

[0027] An embodiment of the present application discloses a damper.

[0028] Example 1

[0029] Reference Figure 1 , Figure 2 and Figure 3 A damper includes a cylinder 1, a damper joint 2 arranged at one end of the cylinder 1, an oil sealing block 3 arranged at the other end of the cylinder 1, a piston rod 5 coaxially arranged in the cylinder 1, and a piston system 4. The piston system 4 divides the cylinder 1 into two oil chambers 9. The piston rod 5 passes through the oil sealing block 3 and passes out of the cylinder 1. A groove 10 is opened on the side wall of the cylinder 1. The extension direction of the groove 10 is parallel to the axial direction of the cylinder 1. The piston system 4 includes a piston ring 41 and a pressure relief assembly 42 arranged at one end of the piston rod 5 close to the damper joint 2. The piston ring 41 is interference fit with the inner wall of the cylinder 1. The groove 10 and the outer ring wall of the piston ring 41 form an oil passage 11 for exchanging hydraulic oil in the two oil chambers 9.

[0030] The pressure relief assembly 42 includes a pressure relief piston 8 sleeved on the piston rod 5 and a positioning member 6 for positioning the pressure relief piston 8. The pressure relief piston 8 is provided with an oil hole 12 for exchanging hydraulic oil in two oil chambers 9. The oil hole 12 connects the two oil chambers 9. The positioning member 6 is sequentially arranged from the end close to the damper joint 2 to the end close to the oil sealing block 3, including a fixing ring 61, a damping gasket 62 and a support gasket 63. The end of the piston rod 5 extending into the cylinder 1 is provided with a stepped shaft 13. The fixing ring 61, the damping gasket 62, the support gasket 63 and the pressure relief piston 8 are all sleeved on the stepped shaft 13. The fixing ring 61 and the stepped shaft 13 are fixedly connected at the end away from the piston rod 5. The support gasket 63 and the stepped shaft 13 are pressed against the shoulder 14 of the piston rod 5. The damping gasket 62 is arranged between the fixing ring 61 and the pressure relief piston 8, and the pressure relief piston 8 is arranged between the fixing ring 61 and the support gasket 63.

[0031] A pressure relief channel 15 for exchanging hydraulic oil in the two oil chambers 9 is formed between the pressure relief piston 8 and the piston ring 41. A sealing member 7 for controlling the opening and closing of the oil hole 12 on the pressure relief piston 8 is provided between the pressure relief piston 8 and the damping gasket 62. The sealing member 7 includes an elastic damping valve plate 71 sleeved on the piston rod 5. In the present embodiment, a plurality of damping valve plates 71 may be provided, and the plurality of damping valve plates 71 are sequentially sleeved on the stepped shaft 13. The damping gasket 62 presses the damping valve plate 71 on the pressure relief piston 8. The damping valve plate 71 is used to seal the oil hole 12 of the pressure relief piston 8.

[0032] An elastic bushing 16 for connecting to a vehicle seat back or a center armrest bracket is provided at the end of the piston rod 5 facing away from the cylinder 1. A separation piston 17 is provided in the cylinder 1. The separation piston 17 is arranged between the damper joint 2 and the piston rod 5. An air cavity 18 is enclosed between the separation piston 17 and the damper joint 2.

[0033] The separation piston 17 is used to separate the air chamber 18 and the oil chamber 9, which is helpful to reduce the sound of the gas bursting when passing through the oil passage 11 when there is gas in the cylinder 1, thereby achieving the effect of noise reduction.

[0034] The implementation principle of Example 1 is as follows: when the piston rod 5 moves away from the damper joint 2, the hydraulic oil pressure in the oil chamber 9 near one end of the oil sealing block 3 increases, and the hydraulic oil moves from the oil passage 11 to the damper joint 2. When the movement speed of the piston rod 5 increases, the greater the speed, the greater the pressure of the hydraulic oil passing through the oil passage 11, and the greater the damping force at this time. When the speed of the hydraulic oil exceeds the threshold, the hydraulic oil exerts force on the damping valve plate 71, and the damping valve plate 71 is deformed by the force and separated from the pressure relief piston 8. At this time, the pressure relief passage 15 is connected, and the hydraulic oil flows in both the oil passage 11 and the pressure relief passage 15, which increases the cross-sectional area of ​​the hydraulic oil through hole, which is beneficial to reducing the problem of poor hand feel caused by too rapid changes in the hydraulic oil pressure in the oil chamber 9 when the piston rod 5 moves violently, and trying to avoid the problem of damage to the damper joint 2 caused by excessive pressure.

[0035] Example 2

[0036] Reference Figure 4 , Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 lies in the blocking member 7.

[0037] The sealing member 7 includes a sealing piece 73 and a spring 72. The spring 72 is sleeved on the piston rod 5. One end of the spring 72 is connected to the damping gasket 62, and the other end of the spring 72 is connected to the sealing piece 73. The sealing piece 73 is used to seal the oil hole 12 of the pressure relief piston 8.

[0038] The implementation principle of Example 2 is as follows: when the speed of the hydraulic oil exceeds the threshold, the hydraulic oil exerts a force on the sealing piece 73, and the sealing piece 73 is forced to move in the direction close to the damping gasket 62. At this time, the spring 72 is compressed, the sealing piece 73 is disengaged from the pressure relief piston 8, and the pressure relief channel 15 is connected. The hydraulic oil flows in both the oil passage 11 and the pressure relief channel 15, which increases the cross-sectional area of ​​the hydraulic oil through hole, which is beneficial to reducing the problem of poor hand feel caused by excessive changes in the hydraulic oil pressure in the oil chamber 9 when the piston rod 5 moves violently.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A damper, used in the field of automobile manufacturing, especially in vehicle seat backs and central armrest brackets, characterized in that: The invention comprises a cylinder (1), a damper joint (2) arranged at one end of the cylinder (1), an oil seal block (3) arranged at the other end of the cylinder (1), a piston rod (5) coaxially arranged in the cylinder (1), and a piston system (4), wherein the piston system (4) divides the cylinder (1) into two oil chambers (9), the piston rod (5) passes through the oil seal block (3) and passes out of the cylinder (1), a groove (10) is provided on the side wall of the cylinder (1), and the piston system (4) comprises a piston ring (41) and a pressure relief assembly (42) arranged at one end of the piston rod (5) close to the damper joint (2), and an oil passage (11) for exchanging hydraulic oil in the two oil chambers (9) is formed between the groove (10) and the outer ring wall of the piston ring (41); The pressure relief assembly (42) and the piston ring (41) enclose a pressure relief passage (15) for exchanging hydraulic oil in the two oil chambers (9); the pressure relief assembly (42) comprises a pressure relief piston (8) sleeved on the piston rod (5) and a positioning member (6) for positioning the pressure relief piston (8); the pressure relief piston (8) is provided with an oil hole (12) for exchanging hydraulic oil in the two oil chambers (9); A sealing member (7) for controlling the opening and closing of the oil hole (12) on the pressure relief piston (8) is provided between the pressure relief piston (8) and the damping gasket (62).

2. A damper according to claim 1, characterized in that: The piston ring (41) and the inner wall of the cylinder barrel (1) are interference fit.

3. A damper according to claim 1, characterized in that: The positioning member (6) comprises a fixing ring (61), a damping gasket (62) and a supporting gasket (63) which are sleeved on the piston rod (5); the fixing ring (61) and the supporting gasket (63) are both fixedly connected to the piston rod (5); the pressure relief piston (8) is arranged between the fixing ring (61) and the supporting gasket (63); and the damping gasket (62) is arranged between the fixing ring (61) and the pressure relief piston (8).

4. A damper according to claim 3, characterized in that: The sealing member (7) comprises an elastic damping valve plate (71) sleeved on the piston rod (5); the damping gasket (62) presses the damping valve plate (71) against the pressure relief piston (8); and the damping valve plate (71) is used to seal the oil hole (12) of the pressure relief piston (8).

5. A damper according to claim 3, characterized in that: The blocking member (7) comprises a blocking piece (73) and a spring (72); the spring (72) is sleeved on the piston rod (5); one end of the spring (72) is connected to the damping gasket (62); the other end of the spring (72) is connected to the blocking piece (73); the blocking piece (73) is used to block the oil hole (12) of the pressure relief piston (8).

6. A damper according to claim 1, characterized in that: The end of the piston rod (5) facing away from the cylinder barrel (1) is provided with an elastic bushing (16) for connecting to the vehicle seat backrest or the central armrest bracket.

7. A damper according to claim 1, characterized in that: A separation piston (17) is arranged in the cylinder (1), and the separation piston (17) is arranged between the damper joint (2) and the piston rod (5), and an air chamber (18) is formed between the separation piston (17) and the damper joint (2).

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