KR101239917B1 - By-pass type body valve assembly for shock absorber - Google Patents

Abstract

The present invention relates to a bypass open body valve assembly capable of improving a ride comfort by reducing a damping force in a high speed section by a bypass flow path.
According to the present invention, there is provided a body valve assembly installed at a lower end of a shock absorber, comprising: a valve body installed at a cylinder end of the shock absorber; A pin bolt member installed to penetrate the center of the valve body; A sliding valve disposed between the inner circumferential surface of the valve body and the outer circumferential surface of the pin bolt member so as to be slidable in a vertical direction; An elastic member for urging the sliding valve to maintain a compression flow path formed in the valve body and a bypass hole formed in the pin bolt member; It includes, The compression flow path is opened by pressing the elastic member in accordance with the pressure size of the working fluid to open the compression flow path or the compression flow path and the bypass hole together is characterized in that the damping force of the shock absorber is adjusted. A bypass open body valve assembly is provided.

Description

BY-PASS TYPE BODY VALVE ASSEMBLY FOR SHOCK ABSORBER}

The present invention relates to a shock absorber body valve that attenuates vibration transmitted from a road surface to a vehicle. More specifically, the bypass open-type body valve can reduce the damping force in a high speed section by a bypass flow path to improve riding comfort. To an assembly.

In general, since the vehicle constantly receives vibrations or shocks from the road through the wheels, a shock absorber is installed between the vehicle body and the axle to prevent the shocks and vibrations from being directly transmitted to the vehicle body, thereby improving ride comfort, and also irregular vibration of the vehicle body. By suppressing this, driving stability is improved.

At this time, the suspension device is commonly referred to as the connection between the vehicle body and the axle including such a shock absorber, and the device is a shock absorber to reduce the impact, the shock absorber to control the free vibration of the chassis spring to improve the ride comfort, rolling (rolling) Resistant stabilizer, rubber bushing, control arm, and the like.

Among the suspension systems, shock absorbers, in particular, function to suppress and attenuate vibrations from the road surface, and are mounted between the vehicle body or the frame and the wheels, and in particular, by absorbing the vibration energy of the vehicle body up and down, the vibration is suppressed and the riding comfort is improved. It increases the durability life by protecting the loaded cargo and reducing the dynamic stress of each part of the body, and at the same time, restrains the movement of the mass under the spring to secure the tire's foldability and suppress the change of attitude by the inertia force Improve.

1 is a cross-sectional view showing a general shock absorber having a body valve.

The shock absorber 40 includes a cylinder 43 filled with a working fluid, a piston rod 46 having one end inside the cylinder and the other end located outside the cylinder, and a cylinder rod 46 mounted at one end of the piston rod 46. And a piston valve 47 reciprocating within 43. The cylinder 43 is composed of an inner tube 41 and an outer tube 42, and a body valve 48 is installed at the end of the cylinder 43 facing the piston valve 47.

A stopper 44 is provided on the outer surface of the piston rod 46. When a large shock is applied to the vehicle, and the shock absorber 40 extends to the maximum length, the piston rod 46 of the shock absorber is pulled out of the cylinder 43 as much as possible, and the upper surface of the piston valve 47 is located above the cylinder 43. There is a possibility of colliding with the rod guide 45 installed in the shaft. Therefore, the stopper 44 serves as a buffer to prevent the piston valve 47 and the rod guide 45 from directly colliding with each other.

The inside of the cylinder is divided into the compression chamber 52 and the tension chamber 51 by the piston valve 47. When the piston valve 47 mounted at the end of the piston rod 46 reciprocates in the cylinder 43 filled with fluid, the working fluid is supplied to the compression chamber by the valve means installed at the piston valve 47. 52) and the tension chamber 51 passes and generates a damping force.

The body valve 48 provided in the conventional shock absorber 40 has a structure in which a damping force is generated by deforming the stacked disks by the pressure of the working fluid. Therefore, the damping force increases as the pressure of the working fluid increases according to the operating speed of the shock absorber, that is, the moving speed of the piston valve 47. This causes a problem that the driver's comfort is deteriorated due to the large damping force generated in the shock absorber when the driver passes the speed bumps or passes the bad road at high speed.

The present invention for solving the above problems, the bypass can be improved by reducing the damping force in the high-speed section by opening the bypass passage in the high-speed operating section of the shock absorber to which a large shock is transmitted from the road surface to the vehicle. It is an object to provide an open body valve assembly.

According to the present invention for achieving the above object, a body valve assembly is installed on the lower end of the shock absorber, the valve body is installed on the cylinder end of the shock absorber; A pin bolt member installed to penetrate the center of the valve body; A sliding valve disposed between the inner circumferential surface of the valve body and the outer circumferential surface of the pin bolt member so as to be slidable in a vertical direction; An elastic member for urging the sliding valve to maintain a compression flow path formed in the valve body and a bypass hole formed in the pin bolt member; It includes, The compression flow path is opened by pressing the elastic member in accordance with the pressure size of the working fluid is opened or the compression flow path and the bypass hole is opened together to control the damping force of the shock absorber. A bypass open body valve assembly is provided.

A center passage is formed in the pin bolt member, and the bypass hole is formed to be connected to the center passage in the pin bolt member.

The sliding valve is in close contact with the lower surface of the valve body includes a support for closing the compression flow path, the elastic member between the support portion formed on the lower end of the pin bolt member and the support portion formed on the lower end of the sliding valve It is preferred to be positioned to intervene.

At least one bypass hole may be formed at an upper end of the pin bolt member, and when a plurality of bypass holes are formed, each of the bypass holes may be formed on the same plane or have a height difference from each other.

According to the present invention as described above, the bypass open-type body valve that can improve the ride comfort by reducing the damping force in the high-speed section by opening the bypass flow passage in the high-speed operating section of the shock absorber to which a large shock is transmitted to the vehicle from the road surface An assembly may be provided.

Accordingly, according to the present invention, even if the shock absorber is operated at high speed while driving the vehicle, an additional flow path is formed in the body valve by opening the bypass flow path so that the area of the flow path is widened and the damping force is lowered. Therefore, the riding comfort can be improved.

In addition, according to the present invention, the primary flow path and the bypass flow path can be controlled in time by one component called a sliding valve, thereby simplifying the configuration of the valve assembly.

1 is a cross-sectional view showing a shock absorber according to the prior art,
Figure 2 is a view showing a state in which the body valve assembly of the shock absorber according to the present invention does not work,
3 is a view showing a state after the operation of the body valve assembly of the shock absorber according to the present invention.

Hereinafter, a bypass open body valve assembly of a shock absorber according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Although not shown in FIGS. 2 and 3, the body valve assembly of the present invention may be mounted and used in a shock absorber as shown in FIG. 1.

The body valve assembly according to the present invention includes a valve body (11) installed at an inner tube end of a cylindrical cylinder filled with a working fluid, and a pin bolt member (15) installed to penetrate the center of the valve body (11). , A sliding valve 21 disposed to be slidable in the vertical direction between the inner circumferential surface of the valve body 11 and the outer circumferential surface of the pin bolt member 15.

The sliding valve 21 keeps the compression flow path 12 formed in the valve body 11 closed by the elastic member 27 and closes the bypass hole 17 formed in the pin bolt member 15. Maintain state. The support 22 of the sliding valve 21 may be in close contact with the lower surface of the valve body 11 to close the compression passage 12.

The elastic member 27 is positioned to be interposed between the supporting portion 18 formed at the lower end of the pin bolt member 15 and the support portion 22 formed at the lower end of the sliding valve 21.

A central passage 16 is formed inside the pin bolt member 15, and a bypass hole 17 is formed to be connected to the central passage 16. One or more bypass holes 17 may be formed at an upper end of the pin bolt member 15. When a plurality of bypass holes 17 are formed, each of the bypass holes may be formed on the same plane or may be mutually spaced. It may be formed to have a height difference. The central passage 16 and the bypass hole 17 form a bypass passage.

The supporting portion 18 formed to radially protrude from the lower end of the pin bolt member 15 abuts against the outer tube end of the cylinder (or a closing member for closing the end of the outer tube) and upwards of the valve body ( 11).

The suction valve 25 may be in close contact with the upper surface of the valve body 11 to close the tension passage 13. The suction valve 25 is pressurized by the holding member 28 so that the tension passage 13 by the suction valve 25 can be kept closed. The holding member 28 may be supported by the head member 23 screwed to the upper end of the pin bolt member 15.

Hereinafter, the operation of the bypass open body valve assembly according to the present invention configured as described above will be described.

2 shows a state in which the bypass open body valve assembly of the present invention is inoperative, and FIG. 3 shows a state after the bypass open body valve assembly of the present invention is in operation.

When the vehicle is stationary or the road surface is flat and the shock absorber does not operate, there is no movement of the working fluid through the body valve assembly, so the body valve assembly remains in the state shown in FIG.

When the shock absorber is actuated and compressed, the pressure on the top of the body valve assembly increases so that the working fluid flows through the compression flow path 12 of the valve body 11. At this time, if the pressure of the working fluid is greater than the pressure of the elastic member 27 supporting the sliding valve 21 to close the compression passage 12, as shown in Figure 3 compress the elastic member 27 As the sliding valve 21 moves while the compression passage 12 opens.

When the compression stroke of the shock absorber is low, the pressure of the working fluid is relatively small so that the working fluid flows through the primary flow path indicated by arrow A in FIG. On the other hand, when the compression stroke of the shock absorber is high speed, the pressure of the working fluid is relatively large and the working fluid flows through the bypass flow path indicated by arrow B in FIG. 3 together with the primary flow path described above. As a result, when the shock absorber operates at high speed, the flow area of the working fluid is increased, thereby reducing the damping force and maintaining a good ride comfort.

3 illustrates a state in which both the primary flow path and the bypass flow path are opened, but the bypass hole 17 formed in the pin bolt member 15 is moved after the sliding valve 21 moves downward by a predetermined distance. Since the puncture position is set to be opened, only the primary flow path may be opened or the primary flow path and the bypass flow path may be opened together according to the pressure of the working fluid.

In addition, when a plurality of bypass holes 17 are formed, and each of the bypass holes 17 is punctured to have different heights from each other, the damping force may be adjusted according to the moving distance of the sliding valve 21. Accordingly, it is also possible to configure the body valve assembly so that the damping force decreases as the pressure of the working fluid increases.

On the other hand, although not shown in the drawings, when the working fluid flows through the tension channel 13 during the tension stroke of the shock absorber, the pressure of the working fluid by opening the tension channel 13 while deforming the suction valve 25 It is possible to flow the working fluid through the tension channel (13).

The holding member 28 interposed between the suction valve 25 and the head member 23 to maintain the suction valve 25 in close contact with the upper surface of the valve body 11 may be a coil spring or a leaf spring. However, other members having elasticity such as dish springs may be used. Alternatively, as long as the gap between the head member 23 and the suction valve 25 can be kept constant, the flow of the working fluid through the bypass hole 17 can not be hindered. Non-elastic members may be used.

Elasticity interposed between the support part 22 of the sliding valve 21 and the support part 18 of the pin bolt member 15 to maintain the sliding valve 21 in close contact with the lower surface of the valve body 11. The member 27 may be a coil spring or another member having elasticity such as a leaf spring or a dish spring may be used.

As described above, the bypass open body valve assembly of the shock absorber according to the present invention has been described with reference to a preferred embodiment of the present invention. However, the present invention is not limited to the embodiments and drawings described above, and various modifications and changes may be made by those skilled in the art within the scope of the claims.

11: valve body 12: compression flow path
13: tension passage 15: pin bolt member
16: center passage 17: bypass hole
18: base 21: sliding valve
22 support portion 23 head member
25: suction valve 27: elastic member
28: holding member

Claims (4)

Body valve assembly installed on the bottom of the shock absorber,
A valve body 11 installed at a cylinder end of the shock absorber;
A pin bolt member 15 installed to penetrate the center of the valve body;
A sliding valve (21) disposed between the inner circumferential surface of the valve body and the outer circumferential surface of the pin bolt member so as to be slidable in a vertical direction;
An elastic member (27) for urging the sliding valve (21) to maintain the compression flow path (12) formed in the valve body and the bypass hole (17) formed in the pin bolt member; Including;
The sliding valve 21 is moved by pressing the elastic member 27 according to the pressure of the working fluid so that only the compression passage 12 is opened or the compression passage 12 and the bypass hole 17 are together. Open to adjust the damping force of the shock absorber,
The sliding valve (21) is a bypass open body valve assembly, characterized in that it comprises a support 22 which is in close contact with the lower surface of the valve body (11) to close the compression passage (12). The method according to claim 1,
The bypass passage body valve assembly, characterized in that the center passage (16) is formed inside the pin bolt member (15) and the bypass hole (17) is formed to be connected to the center passage in the pin bolt member. The method according to claim 1,
The elastic member 27 is positioned to be interposed between the supporting portion 18 formed at the lower end of the pin bolt member 15 and the support portion 22 formed at the lower end of the sliding valve 21. Open body valve assembly. The method according to claim 1,
At least one bypass hole 17 may be formed at an upper end of the pin bolt member 15, and when a plurality of bypass holes are formed, each bypass hole may be formed on the same plane or may have a height difference from each other. A bypass open body valve assembly, characterized in that it is formed.

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