Damper provided with axial flow channel and capable of achieving position sensitive characteristic

Abstract

The invention discloses a damper provided with an axial flow channel and capable of realizing position sensitive characteristics, which comprises a damper outer cylinder, a piston assembly is slidably connected in the damper outer cylinder, an inner cavity of the damper outer cylinder is divided into an upper chamber and a lower chamber through the piston assembly, and a piston rod is arranged on one side of the piston assembly, which is positioned on the upper chamber; the end, away from the piston assembly, of the piston rod penetrates through the damper outer barrel and is located on the outer side of the damper outer barrel, an axial flow channel barrel is further arranged between the damper outer barrel and the piston assembly, a plurality of axial flow channels which are evenly distributed are formed in the axial flow channel barrel, and the widths of the axial flow channels in different positions are different. The damping coefficient of the damper can be changed in real time along with the different positions of the piston relative to the damper cylinder, displacement sensitivity of the damper of the single-piston-rod structure is achieved, and it is guaranteed that the piston does not deviate in the radial direction.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorption, and in particular to a damper with an axial flow channel capable of realizing position-sensitive characteristics. Background Art

[0002] As people's requirements for ride comfort continue to increase, variable damping coefficient dampers are increasingly used in automotive suspensions, among which magnetorheological dampers that adjust the damping coefficient by adjusting the magnetic field strength and CDC dampers that adjust the damping coefficient by adjusting the flow channel size are more commonly used. However, since they have a delay of tens to hundreds of milliseconds in adjusting the damping coefficient, they have poor suppression effects on high-frequency vibrations, especially impacts.

[0003] The damping coefficient of the displacement-sensitive damper is related to the relative position of the piston and the outer cylinder of the damper, and can change with the change of the piston position. Because the adjustment of the damping coefficient of the displacement-sensitive damper does not require current, there is no response delay of current and magnetic field. It can achieve delay-free adjustment, and has a significant effect on suppressing high-frequency vibration and impact.

[0004] However, the damping gap of the traditional displacement-sensitive damper is the annular gap between the piston and the outer cylinder of the damper, and the piston can only be prevented from radial displacement by using a double-rod structure. However, compared with the damper with a single-rod structure, the double-rod structure has a shorter stroke and limited application scenarios. In addition, the variable inner diameter cylinder and double-rod structure have extremely high requirements for processing accuracy, making it difficult to popularize. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a damper with an axial flow channel that can realize position-sensitive characteristics. The damping coefficient of the damper can change in real time with the position of the piston relative to the damper cylinder, thereby realizing the displacement sensitivity of the single-rod structure damper and ensuring that the piston does not shift radially.

[0006] The damper with an axial flow channel that can realize position-sensitive characteristics proposed in the present invention includes a damper outer tube, a piston assembly is slidably connected to the damper outer tube, and the inner cavity of the damper outer tube is divided into an upper chamber and a lower chamber by the piston assembly. A piston rod is arranged on one side of the piston assembly located in the upper chamber, and one end of the piston rod away from the piston assembly passes through the damper outer tube and is located on the outside of the damper outer tube. An axial flow channel tube is also arranged between the damper outer tube and the piston assembly, and the axial flow channel tube is provided with a plurality of evenly distributed axial flow channels, and the width of the axial flow channels at different positions is different.

[0007] Preferably, the width of the axial flow channel decreases from the middle to both ends.

[0008] Preferably, the piston assembly comprises a piston core, a groove for mounting an excitation coil is extended inwardly from the outer circumference of the piston core, a piston core end cover is provided on one side of the piston core located at the lower chamber, and the piston core end cover is connected to the piston core via fasteners.

[0009] Preferably, a coil sealing ring is sleeved on the outer side of the excitation coil, the coil sealing ring completely covers the excitation coil, and the outer diameter of the coil sealing ring is not greater than the maximum outer diameter of the piston core.

[0010] Preferably, a wire outlet hole is provided in the piston rod, an excitation coil lead is provided in the wire outlet hole, and the excitation coil lead is connected to the excitation coil.

[0011] Preferably, the piston assembly includes a piston core, the outer circumference of the piston core extends inwardly with a groove for installing an excitation coil, the piston core is provided with an annular flow channel, and the two ends of the piston core are respectively provided with a piston upper cover and a piston lower cover, an upper magnetic conductive plate is provided between the piston upper cover and the excitation coil, and a lower magnetic conductive plate is provided between the piston lower cover and the excitation coil, and the piston core is also sleeved with a piston outer cylinder, and the piston outer cylinder is slidably connected to the axial flow channel cylinder, the piston upper cover and the piston lower cover are located in the piston outer cylinder, and the piston upper cover and the piston lower cover are abutted against the piston core through the piston outer cylinder.

[0012] Preferably, a coil sealing ring is provided between the excitation coil and the annular flow channel, and the coil sealing ring completely covers the excitation coil.

[0013] Preferably, a wire outlet hole is provided in the piston rod, an excitation coil lead is provided in the wire outlet hole, and the excitation coil lead passes through a wire outlet of the piston core and a wire outlet of the lower magnetic conductive plate to be connected to the excitation coil.

[0014] Preferably, a guide is further provided in the upper chamber, and the piston rod passes through the guide.

[0015] Preferably, a floating piston is further provided in the lower chamber, and a side of the floating piston away from the piston assembly forms an air cavity, and the air cavity is provided with an air charging and discharging port.

[0016] Beneficial technical effects of the present invention: The present invention realizes position-sensitive characteristics by arranging an axial flow channel on the outer cylinder of the damper, and the width of the axial flow channel is different at different positions. The axial flow channel form can use a single-rod structure, which not only solves the problem of radial displacement of the piston of the traditional displacement-sensitive damper in the outer cylinder of the damper, but also increases the effective stroke of the position-sensitive damper. In addition, the axial flow channel can be processed by laser cutting of a cylindrical hollow cylinder. Compared with the traditional position-sensitive damper that processes different inner diameters on the inner wall of the outer cylinder of the damper, the processing difficulty is greatly reduced, the cost is significantly reduced, and the processing accuracy requirements are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a damper with an axial flow channel capable of realizing position-sensitive characteristics according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the axial flow channel tube proposed by the present invention; Figure 3 This is a schematic structural diagram of a piston assembly according to Embodiment 1 of the present invention; Figure 4 This is a schematic structural diagram of a damper with an axial flow channel capable of realizing position-sensitive characteristics according to Embodiment 2 of the present invention; Figure 5 This is a schematic structural diagram of the piston assembly of Example 2 proposed in the present invention.

[0018] In the figure: 1-excitation coil lead, 2-piston rod, 3-wire outlet, 4-guide, 5-damper outer cylinder, 6-axial flow channel cylinder, 7-upper chamber, 8-piston assembly, 801-piston core, 802-excitation coil, 803-coil sealing ring, 804-piston core end cover, 805-fastener, 806-piston lower cover, 807-piston core wire outlet, 808-piston outer cylinder, 809-lower magnetic conductive plate, 810-upper magnetic conductive plate, 811-piston upper cover, 812-annular flow channel, 9-axial flow channel, 10-lower chamber, 11-floating piston, 12-air cavity, 13-charging and discharging port. DETAILED DESCRIPTION

[0019] The present invention will be further explained below in conjunction with specific embodiments.

[0020] Example 1 Reference Figure 1The damper with axial flow channel that can realize position-sensitive characteristics proposed by the present invention comprises a damper outer tube 5, a piston assembly 8 is slidably connected inside the damper outer tube 5, and the inner cavity of the damper outer tube 5 is divided into an upper chamber 7 and a lower chamber 10 by the piston assembly 8. The piston assembly 8 is located on one side of the upper chamber 7 and is provided with a piston rod 2. The end of the piston rod 2 away from the piston assembly 8 passes through the damper outer tube 5 and is located on the outside of the damper outer tube 5. An axial flow channel tube 6 is also provided between the damper outer tube 5 and the piston assembly 8. The axial flow channel tube 6 is provided with a plurality of evenly distributed axial flow channels 9, and the width of the axial flow channels 9 at different positions is different; inside the upper chamber 7, a piston rod 2 is provided at one side of the piston assembly 8. The end of the piston rod 2 away from the piston assembly 8 passes through the damper outer tube 5 and is located on the outside of the damper outer tube 5. A guide 4 is also provided, and the piston rod 2 passes through the guide 4. The guide is provided with a dynamic seal and a guide sleeve between the piston rod; a floating piston 11 is also provided in the lower chamber 10, and the side of the floating piston 11 away from the piston assembly constitutes an air cavity 12, and the air cavity 12 is provided with a charging and discharging port 13; the floating piston moves up and down slightly with the up and down movement of the piston core to compensate for the change in the volume of the piston rod in the outer tube of the damper during the up and down movement of the piston core, and non-magnetic aluminum alloy material can be used; the air cavity is filled with gas of a certain pressure to provide a certain pre-pressure to the upper and lower chambers, and at the same time compensate for the volume of the piston rod during the up and down movement of the piston.

[0021] Reference Figure 2 As a preferred solution of the present invention, the width of the axial flow channel 9 can be set to decrease from the middle to both ends, or other shapes of axial flow channels can be used. The specific shape can be designed according to actual needs; the axial flow channel tube is made of 304 stainless steel, which is non-magnetic, to prevent the magnetic field generated by the excitation coil from leaking through the axial flow channel tube.

[0022] Reference Figure 3 As a preferred embodiment of the present invention, the piston assembly 8 includes a piston core 801, and a groove for installing an excitation coil 802 extends inward from the outer circumference of the piston core 801. The piston core 801 is located on one side of the lower chamber 10 and is provided with a piston core end cover 804. The piston core end cover 804 is connected to the piston core 801 through a fastener (such as a fastening screw, etc.) 805; the piston core and the piston core end cover can be made of magnetically conductive 20# steel.

[0023] In addition, a coil sealing ring 803 is sleeved on the outside of the excitation coil 802, and the coil sealing ring 803 completely covers the excitation coil 802, and the outer diameter of the coil sealing ring 803 is not greater than the maximum outer diameter of the piston core 801; the coil sealing ring is interference fit with the piston core and the piston core end cover, and sealing glue is applied at the fitting to prevent the magnetorheological fluid from entering the interior of the excitation coil. A wire outlet hole 3 is provided in the piston rod 2, and an excitation coil lead 1 is provided in the wire outlet hole 3, and the excitation coil lead 1 is connected to the excitation coil 802.

[0024] The damping channel of this scheme only has the axial flow channel formed between the piston, the axial flow channel tube and the damper outer tube. The axial flow channel is distributed in the entire stroke range. The flow channel area is the largest in the middle area, and the flow channel area gradually decreases towards the two ends. And the magnetic field intensity of the axial flow channel can be adjusted by adjusting the current of the excitation coil in the piston to change the viscosity of the magnetorheological fluid. The damping size of the damper is jointly controlled by the position and the current size. The magnetic field generated by the excitation coil forms a loop between the piston core, the piston core end cover, the axial flow channel and the damper outer tube. The damper outer tube uses a magnetic conductive material, and the axial flow channel tube uses a non-magnetic conductive material.

[0025] Example 2 Reference Figure 4 The damper with an axial flow channel that can realize position-sensitive characteristics proposed in the present invention includes a damper outer tube 5, a piston assembly 8 is slidably connected inside the damper outer tube 5, and the inner cavity of the damper outer tube 5 is divided into an upper chamber 7 and a lower chamber 10 by the piston assembly 8. The piston assembly 8 is located on one side of the upper chamber 7 and is provided with a piston rod 2. The end of the piston rod 2 away from the piston assembly 8 passes through the damper outer tube 5 and is located on the outside of the damper outer tube 5. An axial flow channel tube 6 is also provided between the damper outer tube 5 and the piston assembly 8. The axial flow channel tube 6 has a plurality of evenly distributed axial flow channels 9, and the width of the axial flow channels 9 is different at different positions. A guide 4 is also provided in the upper chamber 7, and the piston rod 2 passes through the guide 4. The guide is provided with a dynamic seal and a guide sleeve between the piston rod; a floating piston 11 is also provided in the lower chamber 10, and the side of the floating piston 11 away from the piston assembly constitutes an air cavity 12, and the air cavity 12 is provided with a charging and discharging port 13; the floating piston moves up and down slightly with the up and down movement of the piston core to compensate for the change in the volume of the piston rod in the outer tube of the damper during the up and down movement of the piston core, and non-magnetic aluminum alloy material can be used; the air cavity is filled with gas of a certain pressure to provide a certain pre-pressure to the upper and lower chambers, and at the same time compensate for the volume of the piston rod during the up and down movement of the piston.

[0026] Reference Figure 2 As a preferred solution of the present invention, the width of the axial flow channel 9 can be set to decrease from the middle to both ends, or other shapes of axial flow channels can be used. The specific shape can be designed according to actual needs; the axial flow channel tube is made of 304 stainless steel, which is non-magnetic, to prevent the magnetic field generated by the excitation coil from leaking through the axial flow channel tube.

[0027] Reference Figure 5The piston assembly 8 includes a piston core 801, and a groove for installing the excitation coil 802 extends inward from the outer circumference of the piston core 801. An annular flow channel 812 is arranged on the piston core 801. A piston upper cover 811 and a piston lower cover 806 are respectively arranged at both ends of the piston core 801. An upper magnetic conductive plate 810 is arranged between the piston upper cover 811 and the excitation coil 802, and a lower magnetic conductive plate 809 is arranged between the piston lower cover 806 and the excitation coil 802. The piston core 801 is also sleeved with a piston outer tube 808, and the piston outer tube 808 is slidably connected to the axial flow channel tube 6. The piston upper cover 811 and the piston lower cover 806 are located in the piston outer tube 808, and the piston upper cover 811 and the piston lower cover 806 are abutted against the piston core 801 through the piston outer tube 808.

[0028] A coil sealing ring 803 is provided between the excitation coil 802 and the annular flow channel 812. The coil sealing ring 803 completely covers the excitation coil 802. The coil sealing ring is interference fit with the upper magnetic conductive plate and the lower magnetic conductive plate, and sealing glue is applied at the fitting position to prevent magnetorheological fluid from entering the interior of the excitation coil.

[0029] The piston rod 2 is provided with a wire outlet hole 3, and the excitation coil lead 1 is provided in the wire outlet hole 3. The excitation coil lead 1 passes through the piston core wire outlet 807 and the wire outlet of the lower magnetic conductive plate 809 to be connected with the excitation coil 801.

[0030] The axial flow channel on the axial flow channel tube of the present invention is only distributed in the middle area of ​​the damper stroke, and an annular flow channel is arranged on the piston. In the middle area, the flow channel area of ​​the damper is the area of ​​the axial flow channel plus the area of ​​the annular flow channel. At this time, the area of ​​the damping channel is large and the damping coefficient is small. When the piston moves to an area without an axial flow channel, only the annular flow channel in the piston is used as the damping channel. At this time, the area of ​​the damping channel is small and the damping coefficient is large. Within the entire stroke range, the viscosity of the magnetorheological fluid at the annular flow channel and the damping coefficient can be adjusted by adjusting the current of the excitation coil in the piston. The magnetic field generated by the excitation coil forms a loop between the lower magnetic conductive plate, the piston outer tube, the upper magnetic conductive plate, the annular flow channel, the piston core and the lower magnetic conductive plate, and the axial flow channel tube and the damper outer tube are made of non-magnetic conductive materials.

Claims

1. A damper having an axial flow channel capable of realizing position-sensitive characteristics, characterized in that: The invention comprises a damper outer cylinder (5), wherein a piston assembly (8) is slidably connected inside the damper outer cylinder (5), and the inner cavity of the damper outer cylinder (5) is divided into an upper chamber (7) and a lower chamber (10) by the piston assembly (8); a piston rod (2) is arranged on one side of the piston assembly (8) located at the upper chamber (7); an end of the piston rod (2) away from the piston assembly (8) passes through the damper outer cylinder (5) and is located outside the damper outer cylinder (5); an axial flow channel cylinder (6) is also arranged between the damper outer cylinder (5) and the piston assembly (8); the axial flow channel cylinder (6) is provided with a plurality of evenly distributed axial flow channels (9); and the widths of the axial flow channels (9) are different at different positions.

2. The damper having an axial flow channel capable of realizing position-sensitive characteristics according to claim 1, characterized in that: The width of the axial flow channel (9) decreases gradually from the middle to both ends.

3. The damper having an axial flow channel capable of realizing position-sensitive characteristics according to claim 1, characterized in that: The piston assembly (8) comprises a piston core (801), the outer circumference of the piston core (801) extending inwardly with a groove for mounting an excitation coil (802), and a piston core end cover (804) is provided on one side of the piston core (801) located at the lower chamber (10), and the piston core end cover (804) is connected to the piston core (801) via a fastener (805).

4. The damper having an axial flow channel capable of realizing position-sensitive characteristics according to claim 3, characterized in that: A coil sealing ring (803) is sleeved on the outside of the excitation coil (802), the coil sealing ring (803) completely covers the excitation coil (802), and the outer diameter of the coil sealing ring (803) is not greater than the maximum outer diameter of the piston core (801).

5. The damper having an axial flow channel capable of realizing position-sensitive characteristics according to claim 3, characterized in that: A wire outlet hole (3) is provided in the piston rod (2), an excitation coil lead wire (1) is provided in the wire outlet hole (3), and the excitation coil lead wire (1) is connected to the excitation coil (802).

6. The damper having an axial flow channel capable of realizing position-sensitive characteristics according to claim 1, characterized in that: The piston assembly (8) comprises a piston core (801), the outer circumference of the piston core (801) extending inwardly with a groove for mounting an excitation coil (802), an annular flow channel (812) being arranged on the piston core (801), and two ends of the piston core (801) respectively having a piston upper cover (811) and a piston lower cover (806), an upper magnetic conductive plate (810) being arranged between the piston upper cover (811) and the excitation coil (802), and the piston lower cover (806) being arranged on the piston core (801). 6) and the excitation coil (802) are provided with a lower magnetic conductive plate (809), the piston core (801) is also sleeved with a piston outer tube (808), the piston outer tube (808) is slidably connected to the axial flow channel tube (6), the piston upper cover (811) and the piston lower cover (806) are located in the piston outer tube (808), and the piston upper cover (811) and the piston lower cover (806) are abutted against the piston core (801) through the piston outer tube (808).

7. The damper having an axial flow channel capable of realizing position-sensitive characteristics according to claim 6, characterized in that: A coil sealing ring (803) is provided between the excitation coil (802) and the annular flow channel (812), and the coil sealing ring (803) completely covers the excitation coil (802).

8. The damper having an axial flow channel and capable of realizing position-sensitive characteristics according to claim 6, characterized in that: The piston rod (2) is provided with a wire outlet hole (3), an excitation coil lead wire (1) is provided in the wire outlet hole (3), and the excitation coil lead wire (1) passes through a piston core wire outlet (807) and a wire outlet of a lower magnetic conductive plate (809) to be connected to the excitation coil (801).

9. The damper having an axial flow channel capable of realizing position-sensitive characteristics according to claim 1, characterized in that: A guide (4) is also provided in the upper chamber (7), and the piston rod (2) passes through the guide (4).

10. The damper having an axial flow channel and capable of realizing position-sensitive characteristics according to claim 1, characterized in that: A floating piston (11) is also provided in the lower chamber (10); a side of the floating piston (11) away from the piston assembly forms an air cavity (12); and the air cavity (12) is provided with an air charging and discharging port (13).

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