KR0127882B1 - Shock absorber - Google Patents

Abstract

The inner winding part(22') that connected with the orifice hole(5a) on the valve housing(4) inner surface of the oil pressure buffing system is formed and the first path(26a) is formed on the upper surface of inside of the valve housing that is detached fixed distance from the bottom of orifice(5) and the second path(26b) that connected with the orifice hole is formed on the side. Also, the opened spring retainer(26) on the bottom is inserted and to the top side of inside of the spring retainer, install the spring(23) and install the stopper(27) to the bottom side are installed. Also, between the spring and the stopper, the damping valve(17) which controls the damping force by the pressure difference is installed.

Description

Hydraulic Shock Absorber

1 is a cross-sectional view showing the configuration of a conventional hydraulic shock absorber.

Figure 2 is a (a) (b) (c) is a plan view of the main portion showing the operation of the conventional hydraulic shock absorber.

Figure 3 shows the damping force characteristic curve of the hydraulic shock absorber.

Figure 4 is a cross-sectional view showing the configuration of a hydraulic shock absorber according to the present invention.

5, 6 is an enlarged cross-sectional view showing the main portion showing the operating state of the hydraulic shock absorber according to the present invention.

* Explanation of symbols for main parts of the drawings

1: hollow rod 2: piston valve

3: subvalve 12: control rod

16 check valve 17 damping valve

18: Retainer 19: Disc

20: disk slot 21: disk ring

23: spring

The present invention relates to a hydraulic shock absorber, and more particularly, to a hydraulic shock absorber that further provides a damping valve for adjusting the damping force in the hydraulic shock absorber to generate a damping force appropriate to the driving situation of the vehicle.

The vehicle is provided with a hydraulic shock absorber for absorbing external shocks in order to improve the riding comfort and driving stability during the driving, and the hydraulic shock absorber is provided with a piston valve for adjusting the damping force.

The conventional hydraulic shock absorber used for this purpose is provided with a piston valve 20 for separating the inside of the tube 13 into the compression chamber 10 and the tension chamber 11, as shown in FIG. (2) consists of a disc (2a), a disc ring (2b) and a disc guide (2c) The hollow rod (1) is pressed into the piston valve (2) and the control rod (12) inside the hollow rod (1) A sub-valve 3 is installed at the lower end of the hollow rod 1 protruding downward of the piston valve 2. The sub-valve 3 is incorporated in the valve housing 4 and the valve housing 4. The first and second shutters 6 and 7 for adjusting the opening degree of the orifice 5 and the orifice 5, the check valve 8 and the spring 9.

The orifice 5 is formed to correspond to the first and second orifice holes 5a and 5b up and down. The first orifice holes are different in size and the second orifice holes are also different in size. The orifice holes 5a and 5b are rotated at 60 degree intervals as shown in FIG.

When the hollow rod 1 is reciprocating linearly, a pressure difference is generated between the compression chamber 10 and the tension chamber 11. Due to this pressure difference, the fluid flows into the compression chamber 10 and the tension chamber 11 through the fixed orifice 22 formed in the piston valve 2 and the fluid flows through the orifice. Damping force is generated by this process, which will be described in detail.

In the compression stroke in which the hollow rod 1 is lowered, the compression chamber 10 is compressed and thus the fluid in the compression chamber 10 flows into the tension chamber 11 through the fixed orifice 22 and at the same time, the orifice ( It is also introduced into the tension chamber 11 through the gaps 6a and 7a between 5) and the first and second shutters 6 and 7.

In the tension stroke in which the hollow rod 1 is elevated, the fluid in the tension chamber 11 passes through the fixed orifice 22 and the gaps 6a and 7a between the orifices 5 and the first and second shutters. In this case, the check valve (8) between the first and second shutters (6,7) blocks the central space of the second shutter (7) by the coil spring (9). 1 is introduced into the tension chamber 11 only through the orifice hole 5a.

As such, the hydraulic shock absorber is configured to generate a lower damping force during compression stroke than during tension stroke.

At this time, when the orifice hole is selected to rotate the first and second shutters 6 and 7 to generate a damping force appropriate to the state of the vehicle among the first and second orifice holes 5a and 5b, the amount of fluid flowing out is increased. Adjusted. Then, even if the vibration according to the change of the road surface due to the pressure drop and the fluid friction is transmitted to the axle through the wheel, the vibration is attenuated by the hydraulic shock absorber and transmitted to the vehicle body.

This conventional hydraulic shock absorber converts the damping force by switching the orifice hole, the damping force curve required in the vehicle is the same as the solid line shown in Figure 3, that is, the damping force such as a dashed line is determined by the piston valve The damping force, such as the dashed line, is determined by the largest of the orifice holes. In addition, the damping force, such as a dotted line, is also determined by the orifice hole, and it is impossible to obtain the damping force, such as a solid line, by the orifice hole.

The present invention has been made to solve the above problems, an object of the present invention is to provide a hydraulic shock absorber that can obtain a suitable damping force required by the vehicle by further providing a damping valve for adjusting the damping force inside the hydraulic shock absorber. Is in.

The present invention for achieving the above object, the control rod is built in a predetermined interval with the inner peripheral surface of the tube, the piston valve partitioning the inside of the tube into the compression chamber and the tension chamber, the fixed orifice is formed, the hollow rod pressed into the piston valve And a valve housing installed at a lower side of the piston valve in a form surrounding the hollow rod and having a hollow portion, an orifice press-fitted into the upper side of the valve housing, having a hollow portion, and having an orifice hole at a side thereof, and being embedded in the orifice. An inlet shock absorber including a check valve interlocked with the control rod and having a hollow portion for selecting the orifice hole, and a check valve resiliently installed in the shutter to open and close the hollow portion of the shutter by a pressure difference between the tension chamber and the compression chamber. In the inner circumferential surface of the valve housing is bent outward of the valve housing And an inner curved portion communicating with the orifice hole, wherein a first passage is formed at an upper surface thereof and a second passage communicating with the orifice hole is formed at a side of the valve housing spaced apart from the lower end of the orifice by a predetermined distance. The bottom of the spring retainer is press-fitted, the upper and the inner of the spring retainer is installed with a spring, and the stopper is pressed in the lower side, and the damping valve for adjusting the damping force is lowered and deformed by the pressure difference between the spring and the stopper. It is a prepared configuration.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the inflow shock absorber according to the present invention. The same elements as the conventional elements use the same numbers.

As shown in FIG. 4, the inflow buffer device according to the present invention divides the inside of the tube 13 into a compression chamber 10 and a tension chamber (not shown), and a piston valve having a fixed orifice 22 formed therein. (2) is installed. The hollow rod 1 is pressed into the piston valve 2, and the control rod 12 having a predetermined distance from the inner circumferential surface of the hollow rod 1 is inserted into the hollow rod 1. The upper end of the control rod 12 is connected to an actuator (not shown) controlled by an electronic control unit (not shown) provided in place of the vehicle. The lower side of the piston valve (2) is provided with a valve housing (4) coupled to the lower end of the hollow rod (1). The valve housing 4 has a hollow portion 4a and an inner circumferential surface thereof is provided to be inner-curve 22 'to function as a flow path.

An orifice 5 having a hollow portion 5c is press-fitted into the upper side of the valve housing 4, and an orifice hole 5a is formed at the side of the orifice in communication with the inner curved portion 22 ′. do. Inside the orifice 5 is a shutter 6 connected to the lower end of the control rod 12 and having a hollow 6a. The control rod 12 is rotated by the rotation of the actuator and the shutter 6 is rotated to select the orifice hole 5a formed in the orifice (see FIG. 2). The check valve 16 which opens the hollow part 5c of the said orifice is provided by being supported by the spring 16a inside the shutter 6.

The damping valve 17 is elastically installed by the spring 23 at the lower side of the shutter 6 among the inside of the valve housing 4. The damping valve 17 forms a variable orifice according to the pressure difference, which will be described.

In the valve housing 4 of the lower part of the shutter 6, a spring retainer 26 having a lower surface with a predetermined distance from the lower part of the shutter is pressurized, and a center is opened in an inner lower part of the spring retainer 26. The stopper 27 is press-fitted. A first passage 26a is formed on an upper surface of the spring retainer 26, and a second passage 26b communicating with the inner curved portion 22 ′ is formed on a side of the spring retainer 26. In addition, a spring 23 is seated on an upper side of the spring retainer 26, and a damping valve having a predetermined distance from the inner peripheral surface of the spring retainer while being supported by the spring 23 between the spring 23 and the stopper 27. 17 is installed.

The damping valve 17 is composed of a retainer 18, a disk 19, a disk slot 20, and a disk ring 21. In detail, a retainer 18 having an orifice hole 18a formed thereon is installed in contact with the spring 23. The lower side of the retainer 18 is coupled to the disk 19, the disk slot 20 and the disk ring 21 while sequentially contacting the bottom. The disk 19, the disk slot 20 and the disk ring 21 are integrally coupled so that a gap does not occur between the contact surfaces, and the disk ring 21 is the stopper in the normal state by the force of the spring 23. Contact with (27). The disc 19, the disc slot 20 and the disc ring 21 all have hollow portions 19a, 20a, 21a. Thus, when the compression stroke and the tension stroke are generated by the lifting and lowering of the hollow rod 1, the amount of fluid passing through the deformation due to the pressure difference and the lifting up and down by the pressure difference is controlled, which will be described in operation.

The operation of the hydraulic shock absorber according to the present invention configured as described above will be described with reference to FIGS. 5 and 6.

The tension stroke will be described with reference to FIG. The fluid of the compression chamber is introduced into the compression chamber 10 through the fixed orifice 22. Then, the fluid of the tension chamber is introduced between the hollow rod 1 and the control rod 12 to be introduced into the hole 5a of the orifice. Then, the fluid flows out through the gap between the inner curved portion 22 '→ the first passage 26a → the retainer 18 and the disk 19 of the spring retainer, and the second curved portion 22' → the second spring retainer. The passage 26b flows out through the gap between the disc ring 21 and the stopper. The reason for this is that there is a difference in the pressure applied to the upper surface and the lower surface of the disk ring, which causes the disk and disk ring to deform. As a result, a gap is generated between the contact portion of the disc and the retainer and the contact portion of the disc ring and the stopper, and the fluid flows out. In the tension stroke, since the check valve 16 blocks the hollow portion 5c of the orifice, the fluid cannot flow out through the hollow portion of the shutter.

In the compression stroke, as shown in FIG. 6, the pressure of the compression chamber 10 is increased, so that the retainer 18, the disk 19, the disk slot 20, and the disk ring 21 are forced by the spring 23. At the same time, the disk 19, the disk slot 20 and the disk ring 21 are deformed to form a variable orifice. In addition, since the check valve 16 is elevated, fluid is also introduced into the tension chamber (not shown) through the hollow portion 5c of the orifice. In addition, since the fluid of the compression chamber 10 also flows into the tension chamber through the fixed orifice 22, a lower damping force is obtained in the compression stroke than in the tension stroke.

As described above, in the hydraulic shock absorber according to the present invention, the damping force is variably adjusted because the disk and the disc ring are properly deformed according to the pressure difference, rather than the reduction force only by the fixed orifice. Therefore, there is a feature that can obtain the same damping force as the solid line of FIG.

Claims (2)

A tube 13, a piston valve 2 partitioning the inside of the tube 13 into a compression chamber and a tension chamber, and a fixed orifice 22 is formed, and an inner circumferential surface of the hollow rod 1 press-fitted into the piston valve 2. The control rod 12 embedded at a predetermined interval, the piston valve (2) in the form of surrounding the hollow rod (1) is installed on the lower side and the valve housing (4) having a hollow (mid) (4a), the An orifice 5 that is press-fitted into the upper side of the valve housing 4 and has a hollow portion 5c and an orifice hole 5a is formed on the side, and is built in the orifice and interlocks with the control rod 12 while the orifice hole 5a A check valve 6 having a hollow portion 6a for selecting) and a check valve resiliently installed in the shutter 6 to open and close the hollow portion 6a of the shutter by a pressure difference between the tension chamber and the compression chamber. In the hydraulic shock absorber provided with (16), In the inner peripheral surface of the valve housing (4) the valve housing The inner curved portion 22 'is bent outwardly and in communication with the orifice hole 5a, and the upper surface of the valve housing 4 is spaced apart from the lower end of the orifice 5 by a predetermined distance. A first passage 26a is formed, and a second passage 26b is formed at a side thereof to communicate with the orifice hole 5a, and a bottom spring spring 26 is press-fitted, and an inner upper side of the spring retainer 26 is press-fitted. It is installed with the spring 23 and the stopper 27 is pressed in the lower side, and the damping valve 17 for adjusting the damping force is provided between the spring 23 and the stopper 27 is raised and lowered by the pressure difference. Hydraulic shock absorber characterized in that. The damping valve (17) according to claim 1, wherein the damping valve (17) has a predetermined distance from the inner circumferential surface of the spring retainer (26) and is brought into contact with the upper surface of the spring (23) by the pressure difference between the compression chamber and the tension chamber. The upper surface is in contact with the retainer 18 at regular intervals from the inner circumferential surface of the retainer 18 and the spring retainer 26 having the orifice hole 18a formed therein, and the lowering and lowering are caused by the pressure difference between the tension chamber and the compression chamber. A disk 19 having a hollow portion 19a for leaking a fluid that causes a gap to be generated at a contact portion with the retainer, and a bottom surface of the disk 19 having a predetermined distance from an inner circumferential surface of the spring retainer 26. The disk slot 20, the spring retainer having a hollow portion 20a for supporting the disk 19 while being lowered and deformed at the same time as being integrally coupled to the tension chamber and the compression chamber pressure difference It is integrally coupled to the bottom surface of the disk slot 20 with a predetermined interval with the inner peripheral surface of (26) and is raised and lowered and deformed at the same time by the pressure difference between the tension chamber and the compression chamber, the gap in the contact portion with the stopper 27 And a disk ring (21) having a hollow portion (21a) to cause the fluid to leak.