KR20020040309A - Piston valve of shock absorber for low velocity control - Google Patents

Abstract

PURPOSE: A low speed piston valve for a shock absorber is provided to control damping force linearly at low speed by modifying plural disk springs combined with the lower part of the piston valve. CONSTITUTION: A piston body(13) having plural orifices(11,12) is formed in a piston rod(2), and a washer(14), an intake spring(15), a retainer(16) and an intake valve(17) are combined with the upper part of the piston body. A disk spring of a piston valve is composed of a first disk spring(30) having a round opening part connected to an extension orifice; a second ring shaped disk spring(40) having the same full diameter as the first disk spring; a third disk spring(50) having the same full diameter as the first disk spring and the second disk spring, and plural slits(51) in the edge in the lower part of the second disk spring; a spacer(42) keeping space between the first disk spring and the third disk spring; and plural disk springs installed in the lower part of the third disk spring. The retainer and the washer are assembled with the lower part of the disk spring. Damping force is controlled linearly at low speed with modifying plural disk springs.

Description

저속 PISTON VALVE OF SHOCK ABSORBER FOR LOW VELOCITY CONTROL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low speed piston valve of a vehicle shock absorber, and more particularly, to a low speed piston valve which improves damping characteristics at low speed by changing the shape and structure of a plurality of disc springs.

Suspension device is mainly installed between the vehicle body and the axle to reduce the shock or vibration transmitted from the road surface while driving to improve the adhesion between the wheel and the road surface and to improve the riding comfort.

In particular, the shock absorber absorbs the free vibration of the spring generated on the road surface and improves the riding comfort. When the spring is compressed, it rapidly compresses and increases the resistance of the oil when it increases and gradually operates to increase the up and down kinetic energy of the spring. It converts into heat energy.

One example of such a shock absorber is shown in FIG.

As shown in FIG. 1, the shock absorber is composed of a combination of long and thin cylinders 1 serving as guides, and there is a cylinder 1 connected to the axle and a piston rod 2 connected to the vehicle body. The piston valve 3 is attached to the end of the piston rod 2, and the cylinder 1 is filled with oil.

On the other hand, the damping action of the spring due to the vehicle vibration is mostly made in the piston valve (3) of the shock absorber, the structure of the piston valve (3) that has been mainly used in the prior art is shown in FIG.

As shown in FIG. 2, the conventional piston valve 3 is coupled to a piston body 13 having a plurality of orifices 11 and 12 formed at the end of the piston rod 2, and above the piston body 13. The washer 14, the intake spring 15, the retainer 16, and the intake valve 17 are sequentially coupled, and a plurality of disc springs 18, retainers 19 and washers are provided at the lower portion of the piston body 13. (20) are sequentially combined.

The conventional piston valve 3 configured as described above flows into the compression orifice 11 as shown in the "arrow A direction" and oil in the tube stored under the piston valve 3 during the compression movement of the cylinder. The oil is discharged to the opposite tube by opening the intake valve 17 while elastically pushing the intake spring (15). At this time, a damping force for the compression movement of the piston rod 2 is generated, the damping force is determined by the elastic modulus of the intake spring 16.

On the other hand, the oil in the tube stored above the piston valve 3 during the extension movement of the cylinder 1 flows into the expansion orifice 12, as shown in the "arrow B direction", and the introduced oil flows into the plurality of discs. The spring 18 is elastically pushed out and flows out to the opposite tube. At this time, a damping force is generated to the stretching movement of the piston rod 2.

However, the conventional piston valve has a problem in that the high speed damping force is also increased when the low speed damping force is increased, thereby decreasing the low speed tuning freedom.

Therefore, the present invention is to solve such a conventional problem, to provide a low-speed piston valve of the shock absorber that can linearly control the low-speed damping force by changing the shape of the plurality of disk springs coupled to the lower portion of the piston valve. Its purpose is to.

The present invention for achieving the above object is a piston body having a compression orifice and an expansion orifice is coupled to the end of the piston rod, washer, intake spring, retainer, intake valve is sequentially coupled to the piston body, In a low speed piston valve of a shock absorber, in which a plurality of disk springs are coupled to a lower portion, the plurality of disk springs have a first disk spring having an annular opening formed therein so as to communicate with an elongated orifice on the inside of the disc, and the same outer diameter as the first disk spring. A third disk spring having an annular hollow center shape, a third disk spring having the same outer diameter as the first and second disk springs, and having a plurality of slits formed on an edge of the disc to be installed below the second disk spring; 1st disc spring and 3rd disc spring This is done with the spacer which is provided for the cavity-holding, a third of a number of disk-shaped disk spring, which is installed on the lower disc spring, it is characterized in that the retainer and washer combination in a disk-shaped disk spring bottom.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

1 is a cross-sectional view showing a conventional shock absorber,

Figure 2 is a cross-sectional view showing a low speed piston valve using a conventional sub-valve,

3 is a sectional view showing a piston valve for a low speed according to the present invention;

4 is a perspective view showing a coupling structure and a shape of a disk spring according to the present invention;

5 to 7 are cross-sectional views showing the behavior of the low speed piston valve according to the present invention.

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

3: piston valve 12; Kidney orifice

13; Piston body 30; 1st disc spring

31; Annular opening 40; 2nd disc spring

41; Opening 42; Spacer

50; Third disk spring 51; Slit

71; Retainer 72; washer

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

Figure 3 is a cross-sectional view showing a coupling structure of the low-speed piston valve of the shock absorber according to an embodiment of the present invention, Figure 4 is an exploded perspective view showing a plurality of disk springs according to an embodiment of the present invention, The same members as those of the conventional piston valve will be described with reference to the same reference numerals.

As shown, the low-speed piston valve 3 of the shock absorber according to the present invention is coupled to the piston body 13 having a plurality of orifices 11 and 12 at the end of the piston rod 2, the piston body ( 13) The washer 14, the intake spring 15, the retainer 16, the intake valve 17 is sequentially coupled to the upper portion.

In particular, according to the characteristic configuration of the present invention, at least three or more disk springs (30, 40, 50, 60, 61, 62) having different shapes are coupled to the lower portion of the piston body 13, the low speed damping force of the vehicle To improve.

In more detail, an annular opening 31 is formed in the first disk spring 30 to communicate with the elongate orifice 12 therein. In practice, a hole 32 through which the piston rod 2 penetrates is formed in the center portion, and the annular opening 31 is used to prevent the inner ring 33 and the outer ring 34 from being completely separated by the annular opening 31. ) Has a minimum connection portion 35. In FIG. 4, two connection parts 35 are formed, and accordingly, the annular openings 31 may be divided into semicircles.

The inner ring 33 of the first disc spring 30 is in contact with the inner bottom of the elongating orifice 12 formed concentrically about the center of the piston body 13, and the outer ring 34 is the elongating orifice 12. It is formed to contact the outer bottom of the. In other words, the inner diameter of the elongate orifice 12 and the width of the annular opening 31 are formed to be substantially the same or the same.

The second disk spring 40 has the same outer diameter as the first disk spring 30 and has an annular hollow shape.

The third disc spring 60 has the same outer diameter as the first and second disc springs 30 and 40 and has a plurality of slits 51 at the edges on the disc to communicate with the opening 41 of the second disc spring 40. It is formed is installed in the lower portion of the second disk spring (40).

In this case, a gap is generated between the bottom of the first disk spring 30 and the top surface of the third disk spring 60 due to the opening 41 of the second disk spring 40. Can be installed to maintain a parallel state.

Under the third disc spring 50 a plurality of disc springs 60, 61, 62 of a conventional disc shape may be added to maintain the elastic force, and a retainer 71 and a washer 72 may be combined thereunder. Contributes to a firm coupling with the piston rod 2.

The piston valve 3 according to the present invention configured as described above has the compression orifice 11 as shown in the "arrow A direction" of oil in the tube stored below the piston valve 3 during the compression movement of the cylinder 1. Inflowing into the oil flows into the opposite tube by opening the intake valve 17 while pushing the intake spring 15 elastically. At this time, a damping force for the compression movement of the piston rod 2 is generated, the damping force is determined by the elastic modulus of the intake spring 16.

On the other hand, the oil in the tube stored above the piston valve 3 during the stretching movement of the cylinder 1 flows into the expansion orifice 12, as shown in the "arrow B direction", and the introduced oil flows into the vehicle speed. By varying the behavior of the plurality of disk spring (30, 40, 50, 60) according to the damping force is appropriately adjusted.

5 is a cross-sectional view showing the operation according to the speed of the low-speed piston valve according to the present invention.

In FIG. 5, the left side shows the piston valve at low speed and the right side shows the piston valve at medium and high speed.

First, at a low speed, when the piston valve 3 rises upward and compresses the oil contained in the upper tube of the piston valve 3, the oil passes through the expansion orifice 12 and the annular opening 31 of the first disc spring 30. Notice). The oil passing through the annular opening 31 exits the tube through the slit 51 of the third disk spring 50 via the opening 41 of the second disk spring 40. As such, since the expansion pressure of the oil is not high at a low speed, the first disk spring 30 to the third disk spring 50 perform a damping function in a state in which deformation by the pressure of the oil is not made, and a linear damping force. This is regulated.

On the other hand, at medium and high speeds, the oil passing through the expansion orifice 12, which is relatively higher than the oil pressure at low speed, causes all the disc springs 40, 50, 60, 61, 62, including the first disc spring 30 to fall. Push all the way out and out of the tube. As such, at medium and high speeds, the degree of damping is determined by the degree of deformation of the disk spring.

In the above description, it should be understood that those skilled in the art can only make modifications and changes to the present invention without changing the gist of the present invention as it merely illustrates a preferred embodiment of the present invention.

As described above, according to the present invention, the low speed damping force can be linearly controlled by changing the shape of the plurality of disc springs coupled to the lower portion of the piston valve.

Claims (3)

A piston body having a compression orifice and an extension orifice is coupled to the end of the piston rod, and a washer, an intake spring, a retainer, and an intake valve are sequentially coupled to the upper piston body, and a plurality of disc springs are coupled to the lower portion of the piston body. 저속 In low speed piston valve of absorber, The plurality of disk springs, A first disk spring having an annular opening formed therein to communicate with said elongate orifice therein; A second disk spring having the same outer diameter as the first disk spring and having an annular hollow shape; A three disk spring having the same outer diameter as the first and second disk springs and having a plurality of slits formed at an edge on the disc to be installed below the second disk spring; A spacer installed to maintain a gap between the first disk spring and the third disk spring; It consists of a plurality of disk-shaped disk springs installed below the third disk spring, Low speed piston valve of the shock absorber, characterized in that the retainer and the washer is coupled to the lower disk spring. The method of claim 1, The first disk spring has a hole through which the piston rod penetrates, and a connection part is formed in order to prevent the inner ring and the outer ring from being separated by the annular opening. The method of claim 1, Low speed piston valve of the shock absorber, characterized in that the inner diameter of the elongated orifice and the width of the annular opening is similar or the same.