Shock absorber and bottom valve thereof
By designing a vibration absorber bottom valve that includes oil inlet, oil outlet and auxiliary oil outlet throttling channels, the problem of increasing damping characteristics during high-speed movement of the vibration absorber is solved, and a smoother damping increase and better vibration damping effect are achieved, improving the operating comfort and handling of the vehicle.
Patent Information
- Application Number
- CN202411860217.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-02-25
AI Technical Summary
The damping characteristics of existing shock absorbers increase when moving at high speeds, resulting in a decrease in vehicle operation comfort and handling.
A vibration damper bottom valve is designed, including an oil inlet throttling channel, an oil outlet throttling channel and an auxiliary oil outlet throttling channel. The opening of the throttling channel is controlled through a check valve assembly and elastic member to achieve a smoother increase in damping characteristics with the increase of compression speed.
It improves the vibration damping effect of the shock absorber at high speeds, and enhances the comfort and handling of the vehicle operation.
Smart Images
Figure CN119508416A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of automobile vibration reduction, in particular to a shock absorber and a bottom valve thereof. Background Art
[0002] Shock absorbers, also called shock absorbers, are devices that accelerate the attenuation of vibrations between the frame and the body to improve the ride smoothness of the car. Shock absorbers are mostly hydraulic, and their working principle is that when the frame and the axle vibrate relative to each other, the piston in the shock absorber is driven to move up and down. Specifically, when the shock absorber is compressed, the piston moves downward, the volume of the upper chamber increases, and the volume of the lower chamber decreases. The flow valve on the piston opens, and the oil in the lower chamber enters the upper chamber through the flow valve. At the same time, a part of the excess oil opens a damping channel of the bottom valve and enters the oil storage cylinder through the damping channel; when the shock absorber is extended, the piston moves upward, the volume of the upper chamber decreases and the volume of the lower chamber increases. The extension valve on the piston opens, and the oil in the upper chamber enters the lower chamber through the extension valve. At the same time, the oil in the oil storage cylinder opens another damping channel of the bottom valve, and enters the lower chamber through the damping channel to replenish the lower chamber. The throttling effect of the bottom valve on the oil causes the shock absorber to produce compression movement and damping during extension movement. At present, the damping characteristics of the shock absorber are limited by the existing bottom valve structure, and the damping increases linearly with the up and down movement speed of the shock absorber after the bottom valve is opened.
[0003] Key performance indicators such as the comfort and handling of the vehicle during operation are mainly reflected by the damping force characteristics of the vibration reduction system. Specifically, when the suspension moves up and down at a high speed, a larger damping is required, and when the suspension moves up and down at a lower speed, a smaller damping is required. In practice, when the suspension moves up and down at a high speed, as the suspension moves up and down, the damping of the shock absorber increases accordingly, the shock absorption experience will become worse as the suspension moves up and down, and the vehicle's running comfort will become worse, which requires further improvement. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a shock absorber and a bottom valve thereof to change the damping characteristics of the shock absorber during high-speed movement, thereby providing a shock absorbing effect of the shock absorber at a high-speed stage and improving the running comfort of the vehicle.
[0005] The technical solution adopted by the present invention to solve its technical problems is: a shock absorber bottom valve, including a valve body, wherein an oil inlet throttling channel and an oil outlet throttling channel are arranged in the valve body, an oil inlet check valve assembly which is sealed with the oil inlet throttling channel is arranged on the valve body, and an oil outlet check valve assembly which is sealed with the oil outlet throttling channel is also arranged on the valve body, a first elastic member for controlling its opening pressure is arranged on the oil inlet check valve assembly, a second elastic member for controlling its opening pressure is arranged on the oil outlet check valve assembly, an auxiliary oil outlet throttling channel is also arranged in the valve body, an auxiliary oil outlet check valve assembly which is sealed with the auxiliary oil outlet throttling channel is also arranged on the valve body, and a third elastic member for controlling its opening pressure is arranged on the auxiliary oil outlet check valve assembly, and the opening pressure is greater than the opening pressure of the oil outlet check valve assembly.
[0006] Furthermore, only at least one throttling hole is provided on the oil outlet one-way valve assembly, and the sum of the minimum cross-sectional areas of the throttling holes is smaller than the minimum cross-sectional areas of the oil outlet throttling channel and the oil inlet throttling channel.
[0007] Furthermore, only at least one throttling hole is provided on the oil inlet one-way valve assembly, and the sum of the minimum cross-sectional areas of the throttling holes is smaller than the minimum cross-sectional area of the oil inlet throttling channel.
[0008] Furthermore, at least one throttling hole is respectively provided on the oil inlet check valve assembly and the oil outlet check valve assembly, and the sum of the minimum cross-sectional areas of the throttling holes on the oil inlet check valve assembly plus the sum of the minimum cross-sectional areas of the throttling holes on the oil outlet check valve assembly is smaller than the minimum cross-sectional areas of the oil inlet throttling channel and the oil outlet throttling channel.
[0009] Furthermore, the first elastic member, the second elastic member and the third elastic member are all butterfly springs.
[0010] Furthermore, the first elastic member is sleeved on a screw threadedly connected to the valve body, and is pressed onto one side of the oil inlet one-way valve assembly through the screw; the second elastic member is also sleeved on a screw threadedly connected to the valve body, and is pressed onto one side of the oil outlet one-way valve assembly through the screw.
[0011] Furthermore, a magnet is provided on the valve body.
[0012] The present invention also provides a shock absorber, wherein the bottom of the shock absorber is provided with the above-mentioned shock absorber bottom valve.
[0013] The beneficial effects of the present invention are as follows: a shock absorber and a bottom valve thereof of the present invention are provided with an auxiliary oil outlet throttling channel and an auxiliary oil outlet one-way valve assembly on the bottom valve, so that the compression speed of the shock absorber reaches a certain value, that is, at the designed high speed, the auxiliary oil outlet throttling channel 613 can be opened, and the excess fluid in the rodless chamber 12 can also enter the oil storage chamber 3 through the auxiliary oil outlet throttling channel 613, thereby reducing the damping of the shock absorber, and making the damping characteristics of the shock absorber increase more smoothly with the increase of the compression speed, thereby improving the vibration reduction effect of the shock absorber at high speed and improving the running comfort of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the shock absorber of the present invention;
[0015] Figure 2 It is a schematic diagram of the bottom valve structure of the present invention;
[0016] Figure 3 It is a structural diagram of the throttle hole;
[0017] As shown in the figure: cylinder 1, piston 2, oil storage chamber 3, bottom valve 6, rod chamber 11, rodless chamber 12, extension valve 21, circulation valve 22, valve body 61, magnet 62, screw 63, oil inlet throttling channel 611, oil outlet throttling channel 612, auxiliary oil outlet throttling channel 613, oil inlet check valve assembly 614, oil outlet check valve assembly 615, first elastic member 616, second elastic member 617, auxiliary oil outlet check valve assembly 618, third elastic member 619, throttling hole 620. DETAILED DESCRIPTION
[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0019] like Figure 1 As shown, the shock absorber of the present invention comprises a cylinder 1, an oil storage chamber 3 and a piston 2 arranged in the inner chamber of the cylinder 1 and slidingly and sealingly matched with the inner chamber of the cylinder 1. The piston 2 divides the inner chamber of the cylinder 1 into a rod chamber 11 and a rodless chamber 12. The rod chamber 11 is provided with a piston rod 4 with one end extending to the outside of the cylinder 1 and the other end connected to the piston 2. The piston 2 is provided with an extension valve 21 for allowing fluid to flow from the rod chamber 11 to the rodless chamber 12 in one direction, and a flow valve 22 for allowing fluid to flow from the rodless chamber 12 to the rod chamber 11 in one direction. The bottom of the rodless chamber 12 is provided with a bottom valve 6. Figure 2As shown, specifically, the bottom valve of the present invention includes a valve body 61, in which an oil inlet throttling channel 611 and an oil outlet throttling channel 612 are provided, one end of the oil inlet throttling channel 611 and one end of the oil outlet throttling channel 612 are both connected to the rodless chamber 12, and the other end of the oil inlet throttling channel 611 and the other end of the oil outlet throttling channel 612 are both connected to the oil storage chamber 3. The valve body 61 is provided with an oil inlet check valve assembly 614 that is sealed with the oil inlet throttling channel 611, and an oil outlet check valve assembly 615 that is sealed with the oil outlet throttling channel 612. The oil inlet check valve assembly 614 can open the oil inlet throttling channel 611 only when the fluid flows unidirectionally from the oil storage chamber 3 to the rodless chamber 12, that is, when oil is inflowing, and the oil outlet check valve assembly 615 can open the oil outlet throttling channel 612 only when the fluid flows unidirectionally from the rodless chamber 12 to the oil storage chamber 3, that is, when oil is outflowing. The oil inlet check valve assembly 614 is provided with a first elastic member 616 for controlling its opening pressure, the oil outlet check valve assembly 615 is provided with a second elastic member 617 for controlling its opening pressure, and the valve body 61 is also provided with an auxiliary oil outlet throttling channel 613, one end of the auxiliary oil outlet throttling channel 613 is connected to the rodless chamber 12, and the other end is connected to the oil storage chamber 3. The valve body 61 is also provided with an auxiliary oil outlet check valve assembly 618 that is sealed with the auxiliary oil outlet throttling channel 613. The auxiliary oil outlet check valve assembly 618 can open the auxiliary oil outlet throttling channel 613 only when the fluid flows unidirectionally from the rodless chamber 12 to the oil storage chamber 3. The auxiliary oil outlet check valve assembly 618 is provided with a third elastic member 619 for controlling its opening pressure, and the opening pressure is greater than the opening pressure of the oil outlet check valve assembly 615.
[0020] When the shock absorber of the present invention is extended, the piston 2 moves to reduce the volume of the rod chamber 11 and increase the volume of the rodless chamber 12, and the fluid in the rod chamber 11 enters the rodless chamber 12 through the extension valve 21. At the same time, the fluid in the oil storage chamber 3 deforms the first elastic member 616, thereby moving the oil inlet check valve assembly 614 to open the oil inlet throttling channel 611, so that the fluid in the oil storage chamber 3 can enter the rodless chamber 12 through the oil inlet throttling channel 611 to replenish the rodless chamber 12. In this process, the oil outlet check valve assembly 615 always keeps the oil outlet throttling channel 612 closed under the action of the second elastic member 617 and the fluid, and the oil inlet throttling channel 611 and the extension valve 21 provide damping for the extension movement of the shock absorber. During the extension of the shock absorber, the faster the piston moves, that is, the faster the suspension moves upward, the greater the deformation of the first elastic member 616, the farther the oil inlet check valve assembly 614 moves, and the greater the opening of the oil inlet throttling channel 611. When the shock absorber is compressed, the movement of the piston 2 increases the volume of the rod chamber 11 and decreases the volume of the rodless chamber 12, and the fluid pressure in the rodless chamber 12 increases. Part of the fluid in the rodless chamber 1 opens the circulation valve 22 and enters the rod chamber 11 through the circulation valve 22. The excess fluid in the rodless chamber 12 deforms the second elastic member 617, and then moves the oil outlet check valve assembly 615 to open the oil outlet throttling channel 612, so that the excess fluid in the rodless chamber 12 can enter the oil storage chamber 3 through the oil outlet throttling channel 612. In this process, the oil inlet check valve assembly 614 always keeps the oil inlet throttling channel 611 closed under the action of the first elastic member 616 and the fluid; the auxiliary oil outlet check valve assembly 618 always keeps the auxiliary oil outlet throttling channel 613 closed under the action of the third elastic member 619 and the fluid; the oil outlet throttling channel 612 and the circulation valve 22 provide damping for the compression movement of the shock absorber. During the compression of the shock absorber, the faster the retraction speed of the piston, that is, the greater the downward movement speed of the suspension, the greater the pressure of the fluid in the rodless chamber, the greater the deformation of the second elastic member 617, the farther the oil outlet check valve assembly 615 moves, and the greater the opening of the oil outlet throttling channel 612. When the compression speed of the shock absorber reaches a certain value, that is, the designed high speed, the pressure of the fluid in the rodless chamber can deform the third elastic member 619 and move the auxiliary oil outlet one-way valve assembly 618, and the auxiliary oil outlet throttling channel 613 can be opened. At this time, the excess fluid in the rodless chamber 12 can also enter the oil storage chamber 3 through the auxiliary oil outlet throttling channel 613, thereby reducing the damping of the shock absorber and making the damping characteristics of the shock absorber increase more smoothly with the increase of the compression speed, thereby improving the vibration reduction effect of the shock absorber at high speed and improving the vehicle running comfort.
[0021] In the present invention, Figure 3As shown, in the embodiment of the present invention, only at least one throttle hole 620 is provided on the oil outlet check valve assembly 615, and the sum of the minimum cross-sectional areas of the throttle hole 620 is smaller than the minimum cross-sectional areas of the oil outlet throttle channel 612 and the oil inlet throttle channel 611. The minimum cross-sectional area of the throttle hole refers to the cross-sectional area at the minimum aperture of the throttle hole. The minimum cross-sectional area of the throttle channel is also the same as the above principle, which is the cross-sectional area at the minimum aperture of the throttle channel.
[0022] After a throttle hole 620 is opened on the oil outlet check valve assembly 615, the oil can enter and exit the rodless cavity through the throttle hole 620. In this way, when the vibration speed to which the shock absorber is subjected is relatively small, the oil can enter and exit the oil storage chamber 3 through the throttle hole 620, without the need to open the oil outlet check valve assembly 615 when discharging oil and the oil inlet check valve assembly 614 when discharging oil. In this way, the opening pressure of the oil outlet check valve assembly 615 and the oil inlet check valve assembly 614 can be set to be larger, so that when the frame moves up and down at a low speed, it only relies on the damping shock absorption provided by the throttle hole 620, which can make the car have better rigidity when vibrating at a low speed (the speed of the car is generally larger when vibrating at a low speed), which helps to improve the car's handling.
[0023] As a variation of the above embodiment, at least one throttling hole 620 may be provided only on the oil inlet check valve assembly 614, and the sum of the minimum cross-sectional areas of the throttling holes 620 may be smaller than the minimum cross-sectional area of the oil inlet throttling channel 611; or, at least one throttling hole 620 may be provided on the oil inlet check valve assembly 614 and the oil outlet check valve assembly 615 respectively, and the sum of the minimum cross-sectional areas of the throttling holes 620 on the oil inlet check valve assembly 614 plus the sum of the minimum cross-sectional areas of the throttling holes 620 on the oil outlet check valve assembly 615 is smaller than the minimum cross-sectional areas of the oil inlet throttling channel 611 and the oil outlet throttling channel 612.
[0024] The first elastic member 616, the second elastic member 617 and the third elastic member 619 can be cylindrical springs, butterfly springs, etc. In order to make the bottom valve structure more compact, the first elastic member 616, the second elastic member 617 and the third elastic member 619 in the embodiment of the present invention are all butterfly springs.
[0025] In order to facilitate the adjustment of the deformation of the first elastic member 616 and the second elastic member 617 as needed, and then adjust the opening pressure of the oil outlet check valve assembly 615 and the oil inlet check valve assembly 614, in the present invention, the first elastic member 616 is sleeved on the screw 63 threadedly connected to the valve body 61, and is pressed on the side of the oil inlet check valve assembly 614 through the screw; the second elastic member 617 is also sleeved on the screw 63 threadedly connected to the valve body 61, and is pressed on the side of the oil outlet check valve assembly 615 through the screw. When the deformation of the first elastic member 616 and the second elastic member 617 needs to be adjusted, just screw the corresponding screw. It can be understood that the first elastic member 616 and the second elastic member 617 can be used for a screw (such as Figure 2 As shown), they can also be individually arranged on a screw.
[0026] In the embodiment of the present invention, a magnet 62 is provided on the valve body 61 for adsorbing the iron core and the like in the fluid to reduce the possibility of the bottom valve being blocked.
Claims
1. A shock absorber bottom valve, characterized in that: The invention comprises a valve body (61), wherein an oil inlet throttling channel (611) and an oil outlet throttling channel (612) are provided in the valve body (61), an oil inlet check valve assembly (614) which is sealed with the oil inlet throttling channel (611) is provided on the valve body (61), and an oil outlet check valve assembly (615) which is sealed with the oil outlet throttling channel (612) is provided, the oil inlet check valve assembly (614) is provided with a first elastic member (616) for controlling the opening pressure thereof, and the oil outlet check valve assembly (615) is provided with a first elastic member (616) for controlling the opening pressure thereof. ) is provided with a second elastic member (617) for controlling its opening pressure, and is characterized in that an auxiliary oil outlet throttling channel (613) is also provided in the valve body (61), and an auxiliary oil outlet check valve assembly (618) is also provided on the valve body (61) for sealingly cooperating with the auxiliary oil outlet throttling channel (613), and the auxiliary oil outlet check valve assembly (618) is provided with a third elastic member (619) for controlling its opening pressure, and the opening pressure is greater than the opening pressure of the oil outlet check valve assembly (615).
2. A shock absorber bottom valve according to claim 1, characterized in that: Only at least one throttling hole (620) is provided on the oil outlet one-way valve assembly (615), and the sum of the minimum cross-sectional areas of the throttling holes (620) is smaller than the minimum cross-sectional areas of the oil outlet throttling channel (612) and the oil inlet throttling channel (611).
3. A shock absorber bottom valve according to claim 1, characterized in that: Only at least one throttling hole (620) is provided on the oil inlet check valve assembly (614), and the sum of the minimum cross-sectional areas of the throttling holes (620) is smaller than the minimum cross-sectional area of the oil inlet throttling channel (611).
4. A shock absorber bottom valve according to claim 1, characterized in that: At least one throttling hole (620) is respectively provided on the oil inlet check valve assembly (614) and the oil outlet check valve assembly (615), and the sum of the minimum cross-sectional areas of the throttling holes (620) on the oil inlet check valve assembly (614) plus the sum of the minimum cross-sectional areas of the throttling holes (620) on the oil outlet check valve assembly (615) is smaller than the minimum cross-sectional areas of the oil inlet throttling channel (611) and the oil outlet throttling channel (612).
5. A shock absorber bottom valve according to claim 1, characterized in that: The first elastic member (616), the second elastic member (617) and the third elastic member (619) are all butterfly springs.
6. A shock absorber bottom valve according to claim 5, characterized in that: The first elastic member (616) is sleeved on a screw threadedly connected to the valve body (61), and is pressed onto one side of the oil inlet check valve assembly (614) through the screw; the second elastic member (617) is also sleeved on a screw threadedly connected to the valve body (61), and is pressed onto one side of the oil outlet check valve assembly (615) through the screw.
7. A shock absorber bottom valve according to claim 1, characterized in that: The valve body (61) is provided with a magnet (62).
8. A shock absorber, characterized in that: The bottom of the shock absorber is provided with a shock absorber bottom valve as claimed in any one of claims 1 to 7.