bypass valve

Abstract

Disclosed is a shock absorber bypass valve, comprising a valve channel and a bypass oil hole in a shock absorber piston rod, a valve seat at the bottom of a lower oil chamber of the shock absorber, a valve needle fixed at the center of the valve seat, the valve needle having a step at a specific length, the end of the valve needle close to the valve seat being large and the other end being small, the valve needle being arranged in the valve channel, and an outer support type return spring in the lower oil chamber, one end of the return spring abutting against the valve seat and the other end abutting against the piston, so that the valve needle can normally return. When a wheel passes through a pit, along with the upward movement of the shock absorber piston rod with the valve channel, part of the oil in the upper oil chamber of the shock absorber enters the valve channel through the bypass oil hole, the outer support force of the return spring pulls the valve needle in the valve channel outward until the valve needle cannot better seal the valve channel, and the part of the oil flows through the channel, thereby reducing the stretching damping of the shock absorber, reducing the consumption of the suspension supporting force by the shock absorber damping, suppressing the vehicle roll, and improving the driving comfort.

Description

Technical Field

[0001] This invention relates to automotive shock absorbers, specifically a bypass valve for adjusting the damping of the shock absorber. Background Technology

[0002] Existing automotive shock absorber damping valves only have traditional disc valves. Under various road conditions, their damping remains constant. When the vehicle wheels pass over potholes, the suspension support force on the vehicle body is almost released to its limit. At this time, the suspension support force is relatively small. Because the damping of the shock absorber disc valve remains constant, the damping of the shock absorber will consume some of the support force provided by the suspension support to the vehicle, causing the vehicle to tilt and making the vehicle bumpy, resulting in a very uncomfortable ride. Summary of the Invention

[0003] Addressing the shortcomings of existing disc valves in vehicle shock absorbers, this invention provides a bypass valve. This bypass valve adds a bypass oil passage to the traditional disc valve design. When the wheel passes over a pothole, just before the suspension support force reaches its limit, the bypass valve's oil passage automatically opens as the shock absorber piston rod moves upward. This reduces the shock absorber's damping loss on the support force of the suspension components, allowing the support force to better support the vehicle, reducing vehicle tilt, and improving ride comfort.

[0004] The bypass valve of the present invention includes: a valve passage inside the piston rod of the shock absorber connected to the piston, the valve passage opening facing the lower oil chamber of the shock absorber; a bypass oil hole is provided on the upper surface of the piston rod near the piston, the bypass oil hole connecting the upper oil chamber of the shock absorber and the valve passage; a valve seat is provided at the bottom of the lower oil chamber of the shock absorber; a valve needle is fixed at the center of the valve seat, the valve needle facing the valve passage, and the top of the valve needle is placed inside the valve passage; the valve needle has a step along a specific length from the valve seat end to the top of the valve needle, so that the outer diameter of the valve needle changes from large to small from bottom to top. The valve seat's outer diameter is smaller than the inner diameter of the lower oil chamber, allowing the valve seat to move left and right within the lower oil chamber. This enables the valve needle to automatically adjust its concentricity with the valve passage inside the piston rod and the shock absorber's oil chamber when the piston wears and the concentricity changes, preventing the valve needle from getting stuck or worn. Inside the lower oil chamber, there is also an external support return spring. One end of the external support return spring rests on the valve seat, and the other end rests on the piston, allowing the valve needle to return to its normal position when the shock absorber piston rod moves upward and the valve needle in the valve passage moves downward.

[0005] The beneficial effect of this invention is that it allows vehicles equipped with this bypass valve to drive more smoothly when passing over potholes, thus improving driving comfort. Attached Figure Description

[0006] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0007] Attached Figure Figure 1This is a cross-sectional view of the present invention, labeled as follows: (1) piston rod, (2) piston, (3) valve passage, (4) bypass oil hole, (5) upper oil chamber, (6) lower oil chamber, (7) valve seat, (8) valve needle, (9) step, (10) external support return spring. Detailed Implementation

[0008] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0009] As shown in the figure, in an embodiment, the bypass valve of the present invention includes: a valve passage (3) is provided inside the piston rod (1) of the shock absorber connected to the piston (2), and the valve passage (3) faces the lower oil chamber (6) of the shock absorber; a bypass oil hole (4) is provided on the upper surface of the piston rod (1) near the piston (2), and the bypass oil hole (4) connects the upper oil chamber (5) of the shock absorber and the valve passage (3); a valve seat (7) is provided at the bottom of the lower oil chamber (6) of the shock absorber; a valve needle (8) is fixed at the center of the valve seat (7), the valve needle (8) faces the valve passage (3), and the top of the valve needle (8) is placed inside the valve passage (3). From the valve seat (7) to the top of the valve needle (8), a step (9) is provided at a specific length, so that the valve needle (8) is... From bottom to top, the outer diameter also changes from large to small; the outer diameter of the valve seat (7) is smaller than the inner diameter of the lower oil chamber (6), allowing the valve seat (7) to move left and right in the lower oil chamber (6), so that when the piston (2) of the shock absorber wears, and the concentricity of the valve passage (3) inside the piston rod (1) and the oil chamber of the shock absorber changes, the valve needle (8) and the valve passage (3) can be automatically adjusted to prevent the valve needle (8) from getting stuck or worn; in the lower oil chamber (6), there is also an external support return spring (10), one end of the external support return spring (10) is pressed against the valve seat (7), and the other end is pressed against the piston (2), so that when the piston rod (1) of the shock absorber moves upward and the valve needle (8) in the valve passage (3) moves downward, the valve needle (8) can return to its normal position.

[0010] In application, when a vehicle equipped with a shock absorber using this bypass valve passes over a pothole, the shock absorber piston rod (1) and piston (2) move upwards along with the upper connecting member of the suspension support. The oil in the upper oil chamber (5) of the shock absorber is squeezed, and part of the oil flows into the lower oil chamber (6) through the conventional disc valve of the shock absorber. Part of the oil enters the valve passage (3) through the bypass oil hole (4). Just before the supporting force of the wheel suspension on the vehicle is about to be released to its limit, accompanied by... As the shock absorber piston rod (1) in the valve passage (3) moves upward, the external support force of the external support return spring (10) pulls the valve needle (8) inside the valve passage (3) outward. When the valve needle (8) is pulled out to a certain length, the smaller end of the step (9) is exposed. At this time, the smaller end of the valve needle (8) cannot seal the valve passage (3) well. The oil flowing from the upper oil chamber (5) into the valve passage (3) through the bypass oil hole (4) will enter the lower oil chamber (6) through this channel. The channel through which the oil flows effectively reduces the tensile damping of the shock absorber, thereby reducing the consumption of the shock absorber damping on the suspension support force at this time, suppressing vehicle roll, and improving ride comfort. When the wheel passes over a pothole, the shock absorber compresses along with the suspension. The piston rod (1) with the valve passage (3) moves downward, and the larger end of the valve needle (8) enters the valve passage (3), sealing the oil flowing into the lower oil chamber inside the valve passage (3). At this time, the shock absorber damping returns to a reasonable working state.

[0011] The beneficial effects of this embodiment are: when the vehicle wheels pass over a pothole, the upward movement of the shock absorber piston rod opens the bypass valve, reducing the damping of the vehicle shock absorber, suppressing vehicle roll, and improving ride comfort.

[0012] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it, although the present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A bypass valve for a shock absorber, characterized in that: The piston rod has a valve passage inside and a bypass oil hole. The lower oil chamber of the shock absorber has a valve seat with a valve needle fixed at the center. There is an external support return spring in the lower oil chamber of the shock absorber.

2. The bypass valve according to claim 1, characterized in that: The piston rod of the shock absorber has a valve passage inside the piston end, with the valve passage opening facing the lower oil chamber of the shock absorber.

3. The bypass valve according to claim 1, characterized in that: A bypass oil hole is provided on the upper surface of the piston rod near the piston, which connects the upper oil chamber of the shock absorber with the valve passage.

4. The bypass valve according to claim 1, characterized in that: A valve seat is located at the bottom of the lower oil chamber of the shock absorber. The outer diameter of the valve seat is smaller than the inner diameter of the lower oil chamber, and the valve seat can move left and right within the lower oil chamber.

5. The bypass valve according to claim 1, characterized in that: A valve needle is fixed at the center of the valve seat, facing the valve passage. The valve needle has a step along a certain length from the valve seat end to the top of the valve needle, so that the outer diameter of the valve needle changes from large to small from bottom to top.

6. The bypass valve according to claim 1, characterized in that: in Inside the lower oil chamber of the shock absorber, there is also an external support return spring. One end of the external support return spring rests on the valve seat, and the other end rests on the piston.

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