KR20050092870A - Damping force variable valve and shock absorber using same - Google Patents

Abstract

The damping force variable valve installed in the damping force variable shock absorber includes a control chamber for controlling the damping force. The control chamber is constituted by a disc assembly having a valve disc, a valve seat and a sealing disc, wherein when the disc assembly sags, the valve disc and the valve seat sag simultaneously, while the sealing disc does not sag and is fixed in position.

Description

DAMPING FORCE VARIABLE VALVE AND SHOCK ABSORBER USING SAME with Variable Damping and Variable Damping Valves

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping force variable shock absorber equipped with a damping force variable valve and a damping force variable valve for varying the damping force used in an automobile. Accordingly, the present invention relates to a damping force variable shock absorber equipped with a damping force variable valve and a damping force variable valve capable of reducing the dispersion of damping force generated in the damping force variable valve and removing noise.

In general, vehicle suspensions must adequately control the damping force in relation to the relative movement of the body and the wheels. For example, the damping force variable shock absorber including a damping force variable valve can reduce the damping force during normal driving of the vehicle, thereby absorbing vibration caused by unevenness of the road surface and improving riding comfort. On the other hand, when turning, accelerating, braking, driving at high speeds, etc., the damping force can be increased, and the attitude change of the vehicle body can be suppressed to improve steering stability.

However, since the wheel movement requires a quick response of 10 Hz or more, the mechanical valve mechanism inside the shock absorber can quickly adjust the damping force according to the relative movement of the vehicle body and the wheel, and the compression and rebound strokes. The development of a valve capable of controlling the damping force characteristics separately at the time has been promoted.

The damping force variable valve of the existing suspension system is divided into a normal type variable valve and a reverse type variable valve according to the damping force control method according to the movement of the vehicle. Reverse type variable valve is characterized by controlling the compression and tension stroke as a separate valve according to the movement of the vehicle. Thus, the reverse type variable valve generates a small damping force in the tension stroke and a large damping force in the compression stroke, or a large damping force in the tension stroke and a small damping force in the compression stroke. However, since the reverse type variable valve uses a separate valve, the production cost is expensive, and the size of the reverse type variable valve is relatively large due to the use of additional valves.

Normally variable valves use a single valve to control both damping forces during compression and tension strokes. Therefore, the normal variable valve generates either a large damping force or a small damping force both in the tension stroke and the compression stroke.

1 is a cross-sectional view showing the structure of a variable shock absorber 1 equipped with a normal damping force variable valve according to the prior art. The inside of the cylinder 10 is partitioned into the tension chamber 2 and the compression chamber 3 by the piston 11 which moves up and down in the cylinder 10. In addition, one end is connected to the piston 11 and the other end is extended to the piston rod 12 and the reservoir 13 to compensate for the volume change in the cylinder 10 according to the vertical movement of the piston rod 12 Is installed in communication with the cylinder (10). A valve 14 for the flow of oil between the tension chamber 2 and the compression chamber 3 is provided in the piston 11, and a valve 15 for the flow of oil between the reservoir 13 and the compression chamber 3. ) Is installed at the bottom of shock absorber (1). One or more of the valves 14 and 15 to be installed may be used as a check valve for allowing oil to flow in one direction without generating damping force and a damping valve for allowing oil to flow in one direction while generating damping force. Can be. The damping force variable valve 20 is provided at one end of the outer diameter portion of the base shell 16, which is the outer portion of the shock absorber 1.

2 is a cross-sectional view showing the structure of a normal type variable valve according to the prior art. The housing 21 of the damping force variable valve 20 is installed at one end of the outer shell portion of the base shell 16 of the shock absorber 1, and the solenoid valve 31 is installed at one end of the housing 21. In the coupling portion of the housing 21 and the shock absorber 1, a first flow path 22 connected to the tension chamber 2 and the compression chamber 3 of the shock absorber 1 and a second connection to the reservoir 13 are provided. The flow path 23 is formed.

Inside the housing 21, a spool 24 is installed to be reciprocated by the solenoid valve 31 in the longitudinal direction. The spool 24 has a plurality of stepped outer diameters in the vertical direction to allow flow of oil. On the outside of the spool 24 is installed a spool rod 25 for guiding the sliding movement of the spool 24, and at the outside of the spool rod 25, a retainer 27 having a connection port 26 is installed. do. The retainer 27 is divided into an upper retainer 27a and a lower retainer 27b, and a disk assembly 28 is installed between the upper retainer 27a and the lower retainer 27b.

An elastic member 29 is installed above the spool 24 to lower the spool 24 raised by the solenoid valve 31 to the initial position, and into the spool rod 25 according to the position of the spool 24. A cutaway groove 24a is formed in a portion of the outer circumference of the spool 24 so as to selectively open the flow path, and correspondingly, a plurality of through holes 25a are formed in the spool rod 25.

In addition, a fine flow path 30 through which a small amount of oil can flow is formed in the lower portion of the upper retainer 27a, which is formed through a space between the outer circumference of the lower retainer 27b and the inner circumferential surface of the housing 20. Communication with the 2nd flow path 23 connected by 13 is carried out.

On the other hand, the disk assembly 28 is a plurality of thin valve disks (28a, 28b) and sealing disk 28c made of a spring steel between the upper retainer (27a) and the lower retainer (27b) is laminated and assembled, A washer 28d is provided between the retainer 27b and the valve disk 28a. The disk assembly 28 is elastically opened by a high oil pressure and forms a structure in which the disk assembly 28 is connected to the reservoir 13 through a flow path formed in the spool guide 25 and the spool 24.

The damping force variable valve 20 of the shock absorber 1 configured as described above has a single damping characteristic because the flow path formed in the spool 24 and the spool guide 25 is blocked when the vehicle is traveling on a flat road at a constant speed. When passing through a rough road surface or a bump, such as to change the position of the spool 24 to open the flow path formed in the spool 24 and the spool guide 25 to have a variable damping characteristics. That is, the damping characteristic of the damping force variable valve 20 changes according to the extent to which the flow path is opened by the movement of the spool 24.

Meanwhile, as described above, the translational movement of the spool 24 is performed by the solenoid valve 31, which includes the solenoid coil (not shown) and the solenoid member 32. When acceleration occurs in the vertical direction of suspension devices such as wheels and control arms (not shown) due to vibration and driving conditions, the acceleration sensor (not shown) detects this acceleration and detects the acceleration. The ECU transmits the signal to the ECU (not shown), and the ECU, which receives the acceleration signal, compares the signal and judges that the current flows through the solenoid coil to generate a magnetic field, which is the solenoid installed at the center of the solenoid coil. Control the position of the member 32.

Conventionally, as shown in FIG. 2, a sealing disc 28c is provided between the housing seat 33 and the valve disc 28a to form the control chamber 34. In this case, one end of the sealing disk 28c is supported on one surface of the housing sheet 33, but when one surface of the housing sheet 33 and the sealing disk 28c are not excellent in processing and the processing degree is not constant, As the entire disk assembly 28 moves, the sealing disk 28c serving as a spring also moves, causing a dispersion in the damping force of the damping force variable valve 20. As a result, it requires a good degree of processing, which has the disadvantage that the processing cost increases.

Also, the other end of the sealing disc 28c is fixed by the valve disc 28a, as shown in FIG. Therefore, as the flow rate increases, the valve disc 28b falls off the upper retainer 27a, so that the whole disc assembly 28 sags when the main valve is opened. As a result, friction occurs between the sealing disc 28b and the valve disc 28a, and thus a noise is generated.

Therefore, the present invention is to solve the disadvantages of the conventional, by configuring the control chamber using the valve disk, the sealing disk and the valve seat, reducing the processing cost, install a damping force variable valve and a damping force variable valve that can prevent noise The object is to provide a damping force variable shock absorber.

According to one embodiment of the present invention for achieving the above object, in a damping force variable valve is installed in a variable damping force shock absorber, including a control chamber for controlling the damping force, the control chamber is a valve disk, valve seat and sealing A damping force variable valve is provided, which is constituted by a disc assembly having a disc, wherein the valve disc and the valve seat sag at the same time when the disc assembly sags, while the sealing disc does not sag and is fixed in position.

According to another embodiment of the invention, a damping force variable shock absorber comprising: a damping force variable valve having a control chamber for controlling the damping force, wherein the control chamber is provided in a disk assembly having a valve disc, a valve seat and a sealing disc. And a damping force variable shock absorber provided that the valve disc and the valve seat sag at the same time when the disc assembly sags, but the sealing disc does not sag and is fixed in position.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, about the same part as a prior art, the same code | symbol is attached | subjected and unnecessary description is abbreviate | omitted.

Figure 3 is an enlarged cross-sectional view of the control chamber portion of the structure of the damping force variable valve according to the present invention. Hereinafter, the structure of the damping force variable valve according to the present invention will be described.

Inside the housing 21, a spool 24 is installed to be reciprocated by the solenoid valve 31 in the longitudinal direction. The spool 24 has a plurality of stepped outer diameters in the vertical direction to allow flow of oil. On the outside of the spool 24 is installed a spool rod 25 for guiding the sliding movement of the spool 24, and at the outside of the spool rod 25, a retainer 27 having a connection port 26 is installed. do. The retainer 27 is divided into an upper retainer 27a and a lower retainer 27b, and a disk assembly 40 is installed between the upper retainer 27a and the lower retainer 27b.

On the other hand, the disk assembly 40 is assembled between the upper retainer 27a and the lower retainer 27b and includes a plurality of thin valve disks 40a and 40b, a valve seat 40c and a sealing disk 40d made of spring steel. ). The valve seat 40c is mounted on the plurality of valve disks 40a, and a grooved sealing disk 40d is stacked thereon. One end of the sealing disc 40d is supported by one surface of the housing sheet 41. At this time, since the valve seat 40c is inserted into the groove of the sealing disk 40d, the shape of the groove of the sealing disk 40d is determined according to the shape of the valve seat 40c. The valve seat 40c inserted into the groove of the sealing disc 40d supports the sealing disc 40d, and serves to seal oil from flowing through the groove from the top to the bottom of the sealing disc 40d.

The control chamber 42 is formed by the disk assembly 40 of this structure. Hereinafter, the operation of the disk assembly 40 as the flow rate of oil increases.

As the flow rate of the oil increases as the piston moves at a high speed, the pressure difference between the high pressure side and the control chamber 42 increases, causing the disk assembly 40 to sag as a whole. That is, due to the pressure difference, the valve disc 40b is dropped from the upper retainer 27a so that the main valve is opened so that oil flows directly from the high pressure side to the low pressure side.

However, in the case of the present invention, due to the valve seat 40c inserted into the groove of the sealing disc 40d and movable up and down, the sealing disc 40d is fixed without moving even if the disc assembly 40 is drooped as a whole. do. In other words, the valve discs 40a and 40b and the valve seat 40c are sag at the same time when deflected, but the sealing disc 40d is always fixed at the position to constitute the control chamber 42.

According to the peculiar structure of the present invention, since the sealing disc 40d is always fixed even when the disc assembly 40 is sag as a whole, even if the machining precision of the sealing disc 40d and one surface of the housing sheet 41 is relatively low, the same is true. Actions and effects can be obtained. Therefore, the processing cost for one surface of the sealing disk 40d and the housing sheet 41 can be reduced. In addition, since one end of the sealing disk 40d is not fixed by the valve disk 40a, noise generated between the sealing disk 40d and the valve disk 40a at the time of deflection can be prevented.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains will have the present invention described in the following claims. Various changes may be made without departing from the gist of the matter. Therefore, the scope of the invention should not be defined by the described embodiments, but should be defined by the claims.

As described above, by forming the control chamber with a valve disc, a valve seat, a sealing disc, or the like, the machining precision of one surface of the sealing disc and the housing seat can be relatively low, thereby reducing the processing cost. In addition, noise generated by friction between the sealing disc and the valve disc can be prevented.

1 is a cross-sectional view showing a shock absorber equipped with a damping force variable valve according to the prior art.

Figure 2 is a cross-sectional view showing the structure of a damping force variable valve according to the prior art.

Figure 3 is an enlarged cross-sectional view showing the structure around the control chamber of the damping force variable valve according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: Shock absorber 2: Tension seal

3: compression chamber 13: reservoir

20 damping force variable valve 24 spool

25: Spool Load 27: Retainer

31: solenoid valve 32: solenoid member

40: disk assembly 40a, 40b: valve disk

40c: valve seat 40d: sealing disc

41 housing sheet 42 control chamber

Claims (4)

In the damping force variable shock absorber, the damping force variable valve comprising a control chamber for controlling the damping force, The control chamber is constituted by a disc assembly having a valve disc, a valve seat and a sealing disc, And the valve disc and the valve seat sag at the same time when the disc assembly sags, but the sealing disc does not sag and the position is fixed. The method of claim 1, And said sealing disc has a groove, and said valve seat is coupled with said sealing disc through said groove. In the damping force variable shock absorber, A damping force variable valve having a control chamber for controlling the damping force, The control chamber is constituted by a disc assembly having a valve disc, a valve seat and a sealing disc, A damping force variable shock absorber in which the valve disc and the valve seat sag at the same time when the disc assembly sags, but the sealing disc does not sag and is fixed in position. The method of claim 3, wherein Wherein said sealing disc has a groove, and said valve seat is coupled with said sealing disc through said groove.