KR100884621B1 - Valve device of shock absorber - Google Patents

Abstract

A valve apparatus of the shock absorber is provided that the low speed damping force can be controlled since the elasticity of the low disc and groove portion size of the low groove disc are controlled. A valve apparatus of the shock absorber comprises a piston valve in which the rebound flow channel and the compression flow channel are formed, a slit disk(140) in which the slit (140a) controlling the fluid flow between the compression chamber and the rebound flow channel is formed, an auxiliary disk(141) including a hole(141a) being connected to the hole of the slit disk, a low disc(142) supporting the auxiliary disk, a low groove disc(143) in which a plurality of groove portions regularly are formed, a main disc(144) which is bended and transformed while supporting the deformation of the low groove disc.

Description

Valve device of shock absorber {VALVE DEVICE OF SHOCK ABSORBER}

1 is a cross-sectional view showing a valve device of a conventional shock absorber.

Figure 2 is a cross-sectional view showing a valve device of the shock absorber according to the present invention.

Figure 3 (a) to (e) is a plan view of the disk to be applied to the valve device of the shock absorber according to the present invention.

Figure 4 is a damping force diagram of the valve device of the shock absorber according to the present invention.

<Description of Signs of Major Parts of Drawings>

110: shock absorber 112: cylinder

114: piston rod 122: compression chamber

124: rebound chamber 130: valve device

131: piston valve 132: compression flow path

134: rebound flow path 136: intake valve disc

137: retainer 138: intake spring

139: washer 140: slit disc

140a: Slit 140b: Hole

141: auxiliary disk 141a: hole

142: low disk 143: low groove disk

143a: groove 144: main disk

147: nut 148: washer

149 retainer

The present invention relates to a shock absorber valve device installed in a shock absorber to control damping force, and more particularly, to a shock absorber having a linear damping force characteristic as a whole by improving the damping force characteristic in an ultra-low speed moving section of a piston. will be.

In general, the shock absorber is provided between the vehicle body and the axle to absorb various vibrations or shocks transmitted from the wheels in contact with the road surface while driving to improve the vehicle riding comfort and driving stability. More specifically, the shock absorber improves ride comfort by absorbing the free vibration of the spring generated on the road surface.In particular, the shock absorber generates a damping force by using a resistance against fluid flow when the piston installed inside the cylinder performs a rebound stroke. It is configured to convert the vertical kinetic energy of the spring into thermal energy and release it.

1 is a cross-sectional view showing a valve device of a conventional shock absorber. Referring to FIG. 1, a conventional shock absorber 10 includes a cylinder 12 connected to an axle, and a piston rod 14 having one end movable on the cylinder 12 and the other end connected to the vehicle body. .

In addition, the end of the piston rod 14 is provided with a valve device 30 for controlling the damping force between the compression chamber 22 and the rebound chamber 24 formed in the cylinder 12.

The valve device 30 includes a piston valve 31 installed at an end of the piston rod 14 to partition the inside of the cylinder 12 into a compression chamber 22 and a rebound chamber 24. The piston valve 31 is formed with a compression flow path 32 and a rebound flow path 34 to allow fluid movement between the compression chamber 22 and the rebound chamber 24, respectively.

In addition, an upper portion of the piston valve 31 is provided with an intake valve disc 36 for opening the compression flow path 32 during the compression stroke. In addition, the lower portion of the piston valve 31 is provided with a plurality of valve disks (40, 42) configured to control the opening degree of the rebound flow path 34 in the low speed and high speed section and thereby generate different damping forces. . The valve discs 40, 42 are installed below the piston valve 31 by nuts 47, washers 48, and retainers 49.

The valve disk positioned at the top of the above-described plurality of valve disks 40 and 42 is a slit disk 40 having a slit 40a formed at its periphery, also referred to as a 'disk-S'.

The slit disk 40 is fluid discharged through the slit 40a in the low speed rebound section of the shock absorber 10 and generates a low speed damping force. In addition, a plurality of main disks 45 are stacked on the bottom surface of the slit disk 40, and the main disks 45 pass through the slit 40a described above in the high speed rebound section of the piston valve 31. To generate a high speed damping force while causing bending deformation.

However, in the valve device of the shock absorber according to the prior art, the damping force characteristic is nonlinear in the process of generating a low speed damping force through the fluid passing through the slit of the slit disk. Accordingly, in the process of rapidly changing the damping force characteristics of the section in which the medium to high speed attenuation occurs in the low speed attenuation force of the shock absorber, it is a factor that reduces the riding comfort. In addition, the valve device of the conventional shock absorber cannot generate the ultra low damping force, and thus, it is not possible to quickly absorb the vibration of the vehicle in the section where the ultra low damping force occurs. There is a problem that it is difficult to control the damping force after the medium speed.

Accordingly, the present invention is to solve the problems of the prior art, to improve the valve structure by generating a damping force in the ultra-low speed section, to make the overall damping force characteristic curve close to linear, and to reduce the damping force in the section after the low and medium speed It is to provide a shock absorber valve device that can be adjusted to increase the degree of freedom of tuning the damping force.

In the valve device of the shock absorber installed in the piston rod of the shock absorber according to the present invention for generating the damping force by controlling the flow of fluid between the rebound chamber and the compression chamber according to the present invention, the valve device is the rebound chamber And a piston valve having a rebound flow path and a compression flow path formed therein for the flow between the and compression chambers; A slit disk having a slit and allowing fluid flow between the flow path and the compression chamber, an auxiliary disk having a hole communicating with the hole of the slit disk and disposed to be in contact with a lower side of the slit disk; Is arranged to be in contact with the lower side to A row groove having elastically supported row disks, a row groove disk having a plurality of grooves radially arranged to selectively receive a peripheral portion of the row disk, and formed at predetermined intervals, and installed at a lower side of the row groove disk, And a main disk that flexibly deforms and deflects the deflection of the disk.

Here, the row disk or the main disk may be made of at least one.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing a valve device of the shock absorber according to the present invention, Figure 3 (a) to (e) is a plan view of the disk to be applied to the valve device of the shock absorber according to the present invention.

The valve device of the shock absorber according to the present invention, as shown in Figures 2 and 3, is installed in the shock absorber 110 provided between the vehicle body and the axle to vary the damping force.

The shock absorber 110 includes a cylinder 112 connected to the axle, and a piston rod 114 having one end movably installed at the cylinder 112 and the other end connected to the vehicle body. The piston rod 114 has a valve device 130 is installed at one end inserted into the cylinder 112.

The valve device 130 divides the inside of the cylinder 112 into a compression chamber 122 and a rebound chamber 124.

The valve device 130 includes a piston valve 131 in which a compression flow path 132 is formed at a side far from the center and a rebound flow path 134 is formed at a side near the center. In addition, the compression flow path 132 and the rebound flow path 134 selectively allow fluid flow between the compression chamber 122 and the rebound chamber 124 during the compression stroke and the rebound stroke where the piston descends and rises. Formed.

The piston valve 131 has a structure in which a washer 139, an intake spring 138, a retainer 137, and an intake valve disk 136 are sequentially stacked on the piston valve 131, and the intake valve disk 136 is During the compression stroke of the piston valve 131 has a quick response to the bending deformation and serves to open the compression flow path (132). In addition, the lower portion of the piston valve 131 is provided with a rebound valve structure for generating a damping force during the rebound stroke.

As described in detail below, the valve device 130 configured as described above may generate a linear damping force over the low speed rebound section and the medium / high speed rebound section of the piston valve 131, and Damping force can be generated.

To this end, the valve device 130 is a slit disk 140, the auxiliary disk 141, the low disk 142, the low groove disk 143 to the piston rod 114 through which the piston valve 131, The main disk 144 is installed sequentially, each of which is the lower side of the piston valve 131 by a nut 147 and a washer 148 and a retainer 149 coupled to the end of the piston rod 114. Is installed on.

The slit disk 140 faces the rebound flow path 134 in a state of being seated on the valve seat 133 under the piston valve 131. In addition, a plurality of slits 140a are formed at the edges of the slit disk 140 to bypass the fluid from the rebound flow path 134 while partially covering the rebound flow path 134. In addition, the slit disk 140 is formed with a hole 140b which is generally in communication with the rebound flow path 134.

In addition, an auxiliary disk 141 is installed below the slit disk 140. Here, the auxiliary disk 141 is formed with a hole 141a communicating with the hole of the slit disk 140.

In addition, a lower disk 142 is provided below the auxiliary disk 141 to elastically support the auxiliary disk 141. The raw disk 142 is bent and deformed at the periphery by the fluid passing through the holes 140b and 141a of the slit disk 140 and the auxiliary disk 141 and allows the flow of the fluid. In addition, in the present embodiment, the row disk 142 has a structure in which two disks are stacked, which does not limit the present invention, and the manufacturer desires to control the number, material, and / or thickness of the disks. It is possible to design the valve device 130 with a damping force characteristic.

To this end, the row groove 143a is formed in the row groove disk 143 to selectively receive the peripheral portion of the row disk 142 when bending.

 Here, the groove portion 143a is arranged radially around the central axis, it may be formed of a plurality of formed at a predetermined interval from each other.

Accordingly, the row disk 142 is supported at the center of the row groove disk 143 during bending deformation, and only the peripheral portion of the row disk 142 positioned in the groove portion 143a is selectively bent to open the flow path. Done.

As described above, the row groove disk 142 is bent in the row disk 142 by adjusting the number of the groove portions 143a or by adjusting the size of the groove portions 143a or the distance between the groove portions 143a. The amount of deformation can be adjusted.

In addition, a lower side of the row groove disk 143 includes a main disk 144 that elastically supports the bending deformation of the row groove disk 143 and bend deformation. The main disk 144 is connected to the fluid through which the row disk 142 and the row groove disk 143 pass through the holes of the rebound flow path 134 and the slit disk 140 and the auxiliary disk 141 connected thereto. It is supported by the bending deformation as it is deformed by, and when the bending deformation of the low groove disk 143 becomes large, the main disk 144 is bent deformation and generates a medium, high speed damping force. In the exemplary embodiment of the present invention, the main disk 144 has a stack structure of four sheets, but is not limited thereto. The damping force may be adjusted by adjusting the number of sheets, the material, or the thickness of the main disk 144.

Figure 4 shows the damping force diagram of the valve device of the shock absorber according to the present invention, the operation of the valve device of the shock absorber with reference to Figure 4 as follows.

Referring to FIG. 4, the valve device 130 of the shock absorber 110 is compressed through the slit 140a of the slit disk 140 after the fluid passes through the rebound in the ultra low speed rebound section of the shock absorber 110. Discharged into the flow path. At this time, the fluid generates a fluid resistance (or oil resistance) in the process of passing through the slit 140a, thereby generating a very low damping force.

Then, when the rebound speed of the piston valve 131 increases or the pressure accordingly increases, the damping force of the shock absorber 110 increases. At this time, the fluid is more than the amount of fluid passes through the slit 140a of the slit disk 140, so that the fluid passes through the holes of the slit disk 140 and the holes of the auxiliary disk 141 And the low disk 142 is bent and deformed. At this time, the row disk 142 is partially bent to the groove portion 143a of the row groove disk 143, and the flow path through which the fluid passes. In addition, the row groove disk 143 may control the degree of bending deformation of the row disk 142 according to the curved shape of the groove portion (143a).

As such, the valve device 130 has a primary blow off at the point A at which the low disk 142 is bent and deformed and an intermediate damping force occurs. The primary blow-off of point A described above means that the damping force is generated in two stages in the low-speed rebound period, which contributes to obtaining a smooth and nearly linear damping force diagram.

Next, while the rebound speed of the piston valve 131 is further increased, and thus the pressure is further increased, in the high speed rebound section, the low disk 142 is caused by the fluid passing through the rebound flow path 134. And the row groove disk 143 is deformed and the main disk 144 is bent. As such, the medium and high speed damping force of the fluid is generated while the main disk 144 is bent, thereby causing a secondary blow off at the point B of the damping force diagram of FIG. 4. By the first blow-off in the low-speed rebound section before the second blow-off occurs, the secondary blow-off continues to form a gentle curve even in the high-speed rebound section, so that the overall damping force characteristic becomes a smooth linear. do.

Therefore, the valve device 130 of the shock absorber 110 according to the present invention can adjust the ultra low damping force by adjusting the slit 140a of the slit disk 140, and the elasticity of the low disk 142 and the The low speed damping force may be adjusted by adjusting the size of the groove 143a of the low groove disk 143, and the medium and high speed damping force may be adjusted by adjusting the elasticity of the main disk 144. As such, the valve device 130 adjusts the damping force in the ultra low speed, low speed, or medium and high speed damping force sections to smooth the change in the damping force at the primary blow off point A and the secondary blow off point B. It can improve the tuning performance of the damping force, and can greatly contribute to improving the ride comfort and steering stability of the vehicle.

 While the invention has been described above with reference to specific embodiments, various modifications, changes or modifications may be made in the art within the spirit and scope of the appended claims, and thus, the foregoing description and drawings It should be construed as illustrating the present invention rather than limiting the technical spirit of the present invention.

The valve device of the shock absorber according to the present invention improves the valve structure by causing the damping force to be generated in the ultra low speed section, and makes the overall damping force characteristic curve close to linear, and the damping force can be adjusted in the section after the low speed and the medium speed. Tuning degree of freedom can be increased. In addition, by improving the degree of freedom of tuning the damping force in this way it can greatly contribute to improving the ride comfort and steering stability of the vehicle.

Claims (2)

In the valve device of the shock absorber is installed on the piston rod of the shock absorber to control the flow of fluid between the rebound chamber and the compression chamber to generate a damping force, The valve device may include a piston valve having a rebound flow path and a compression flow path for fluid flow between the rebound chamber and the compression chamber; A slit disk installed at a lower portion of the piston valve, having a through hole formed therein so as to be connected to the rebound flow passage, and having a slit formed therein with a slit to allow fluid flow between the rebound flow passage and the compression chamber; An auxiliary disk having a hole communicating with said hole of said slit disk and disposed to be in contact with a lower side of said slit disk; A low disk disposed to be in contact with a lower side of the auxiliary disk to elastically support the auxiliary disk; A row groove disk having a plurality of grooves radially arranged and formed at predetermined intervals to selectively receive a peripheral portion of the row disk; And a main disk installed on the lower side of the row groove disk to elastically support the bending deformation of the row groove disk and bend the deformation of the row groove disk. The method according to claim 1, The low disk or the main disk is a shock absorber valve device, characterized in that made of at least one.

Images