JPS59133892A - Damping valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damping valve device used in a hydraulic shock absorber.

Shock absorbers used in automobiles and the like are required to have independent damping force characteristics on the rebound and compression sides.

Conventionally, this kind of hydraulic! (For example, there is a type of valve device shown in FIG. 1.

This double cylinder shock absorber 1 has an inner cylinder 2 and an outer cylinder 3. The inner cylinder 2 is separated by a piston 4 into upper and lower chambers 5 and 6, and the lower chamber 6 and the outer cylinder 7 are separated. It communicates via a pace valve 8. The piston 4 is provided with an oil passage 11 through which hydraulic oil flows during the pressure stroke, and on the upper surface of the piston 4 where the oil passage 11 opens, an annular leaf valve 12 is pressed by a conical coil spring 13 to open a check valve on the pressure side. Configure.

On the other hand, a sliding ring 15 is attached to a coil or spring 16 on the lower surface of the piston 4 where the oil passage 14 through which hydraulic oil flows in the expansion stroke is opened.
The pressure is applied to the oil passage 14, and a predetermined rebound damping force is applied. Occur.

The base valve 18 is disposed on the oil passage 19.20, and is provided with an annular leaf valve 22 biased by a conical coil spring 21 to form a check valve that opens on the expansion side. 23 is provided to constitute a pressure side damping valve that provides resistance to the hydraulic oil flowing out on the pressure side.

During the expansion stroke of the shock absorber 1, the hydraulic oil corresponding to the volume of the piston rod 9 opens the leaf valve 22, passes through the entire oil passage 19, and flows from the outer cylinder chamber 7 to the lower chamber 6 with almost no resistance.
In the 11th stroke of reverse VcFEflli, the hydraulic oil corresponding to the incoming volume of the piston rod 9 opens the leaf valve 23 and flows into the oil passage 2.
0, flows from the lower chamber 6 into the outer cylinder chamber 7, and the pressure I
Is the flow path resistance specified by ll? is applied to generate damping force.

As described above, the shock absorber 1 can generate independent damping forces on the compression side and the rebound side, but the piston 4 or the base valve 8 has a complicated structure, which requires an increase in the number of parts and a high degree of machining Nff [ There was a rough spot between things like being required.

Furthermore, as in Japanese Patent Application Laid-open Nos. 57 to 70539, a shock absorber has been proposed in which a thin plate is provided with a slit to form a full tongue, and the tongue responds to pressure to create an opening in the thin plate. Although it has the effect of preventing the generation of excessive damping force, it is not possible to cause damping chips to occur independently on the compression side of the shock absorber and the expansion law.

Therefore, in the present invention, by stacking a plurality of thin plates having radial valve holes whose sizes are changed in stages and clamping and fixing the outer periphery of the plates, independent damping chips are generated on the expansion side and compression side of the shock absorber. A damping valve with a relatively simple structure? The purpose is to provide.

Embodiments of the present invention will be described below based on the accompanying drawings.

Circular thin plate 31, 32.33°34 shown in Figures 2 to 6
．． 35 are stacked one after another to form a complete valve 3° (shown in FIG. 8). The thin plate 31 has three slits radially extending from the center hole 40A to form a radial valve hole 39A and three substantially fan-shaped tongues 42.The end of the slit 41A is The thin plates 32 and 33 are formed into a circular shape to reduce stress concentration.
Valve holes 39B and 39C are formed concentrically with the diameter of 0C and the middle diameter of the slits 41B and 41C increased in stages, and It is also formed concentrically at 39D and 39E'.

In addition, a notch 43 is provided at the outer edge of each of the thin plates 31 to 35.
The positioning of each of the thin plates 31 to 35 is achieved by fully forming the notches 43 and fully engaging them.

Figure 7 shows the above) thick plates 31 to 35 in the gas-filled shock absorber 45.
It is equipped with valves 30 that are all stacked.

The '1jtWA device 45 has a piston 47 attached to the end of the piston rod 46, and the piston 47 is slidably housed in the cylinder 48 to separate upper and lower chambers 49 and 50. While filling the hydraulic fluid to .50,
A free piston 51 is movably housed in the lower part of the cylinder 48, and a gas chamber 52 is separated.

The piston 47 is composed of a cylindrical portion 55 and an upper surface portion 56, and the upper surface portion 56 has a hole 58 through which the piston rod pilot portion 57 passes and a through hole 59 through which hydraulic oil flows. Cylindrical part 55
A stepped portion 60 is formed on the inner circumferential surface of the thin plates 31 to 35, and the thin plates 31 to 35 are stacked in order, and the ring 61 is screwed to the cylindrical portion 55 to clamp and fix the entire outer circumference of these thin plates 31 to 35, and the valve 30 is attached to the piston 47. ¥-Internally installed.

Next, to explain the effect, the expansion 1i1 of the buffer 45
In the 11th stroke, the upper chamber 49 contracts, then the lower chamber 50 expands, and the hydraulic oil flows through all of the valves 30 of the heaviston 47. At the same time, the free piston 51 expands by the volume of the piston rod 46 into the gas chamber 52'. moves.

Pal in culvert 8 and 9? To explain the operation of the valve 30, the hydraulic oil flows downward through the opening of the valve 30 (Fig. 8).
As the thin plate 31 flows, pressure is applied to the upper surface of the thin plate 31, and downward bending stress is generated on the tongue piece 42, but all the thin plates 32 to 35 located below the thin plate 31 are laminated with this tongue piece 42. The tongue piece 42 is supported like a flat plate to prevent the tongue piece 42 from bending greatly. For this reason, the opening area of the valve 30 hardly changes, providing a large flow path resistance to the hydraulic fluid passing therethrough.

On the other hand, when the shock absorber 45 is about one inch indentation, contrary to the above, the hydraulic oil flows from the lower chamber 50 to the upper chamber 49 via all the valves 30. Compress 52.

In FIGS. 10 and 11, hydraulic oil flows upwardly (FIG. 10) through the opening of the valve 30. At this time, the thin plate 31
35 receives pressure on the lower surface, and each tongue piece 42 bends upward. However, in this case, the thin plates 32 to 35 cannot completely suppress the deflection of the tongue piece 42, and the opening area of the valve 30 increases in proportion to the pressure.

In this way, the spring load of the valve 30 changes depending on the flow direction of the hydraulic oil, and the flow path resistance can be changed, and the shock absorber 45 can generate independent damping force sounds on the compression side and the expansion side.

Further, as shown in FIG. 12, the damping valve 30 may be attached to a double-tube shock absorber 65. A piston 67 is provided at a distance 5iU69.70 below the entire inner cylinder 68,
This piston 67 is provided with a valve 30A'll- similar to the above.
A base valve 308 is provided at the bottom of the inner cylinder 68 to communicate the lower chamber 70 and the outer cylinder chamber 71 via the valve 308. Outer cylinder chamber 71
A gas chamber is sealed in the upper part (left direction in Fig. 12) of the outer cylinder chamber 71 and the upper and lower part of the inner cylinder %69.7.
Completely fill the tank with hydraulic oil.

According to the above configuration, hydraulic oil passes through the piston 67 or the valves 3QA and 308 provided at the bottom of the inner cylinder 68 in accordance with the expansion and contraction of the shock absorber 65, and the damping force sound is independent of the expansion side and pressure 1 law. can occur.

In this case, the compression side damping force is mainly caused by the base valve 3.
Due to 0B, the damping force of the extension 1 is mainly caused by the piston valve 3.
Governed by 0A.

Also, as shown in FIG. 13, three fan-shaped thin plates 36 are combined to form a center hole 38? A circular thin plate 37 is formed by forming a circular thin plate 37, and instead of the thin plate 31, a thin plate 37° 32.33.34.
If all 35 valves are stacked one on top of the other in order to form the entire damping valve, the minimum opening area (constant orifice) of the damping valve can be made smaller.

In addition, as shown in FIG. 14, four trays are formed in the circular thin plate 78 radially from the center hole 75A7), and the radial valve hole 74A and the approximately fan-shaped tongue piece 77 are formed in the circular thin plate 78. Thin FF178.79.80 has center holes 75A, 7
5B, 75C and slits 76A, 76B.

Valve holes 74A are each made thicker than 760 in stages.

74B, 740, and the thin plate 81.82 has a central hole 75D while keeping the slits 76D, 76B constant.

75B? Valve holes 74D and 74E are formed which are enlarged in stages. It is also possible to form a damping valve by stacking these thin plates 78, 79, 80, 81, 82 in sequence.

In addition, as shown in FIG. 19, all four fan-shaped thin plates 85 are combined to form a center hole 86'5 to form one circular thin plate 84, and thin plates 84 and 79 are formed in the thin plate 78.

If the mounting valves are stacked in the order of 80, 81, and 82, the minimum opening area of the valve can be made small in the same way as above.

Note that the loading force characteristics can be freely selected by changing the number and material of the thin plates, the number of slits, the width of the slits, the plate thickness, and other shapes of the thin plates.

As described above, according to the present invention, valve holes consisting of a central hole and a slit are formed in a plurality of thin plates, each with a stepwise change in size, and these thin plates are stacked to form a damping valve. - With the valve, it is possible to obtain the required reduction force characteristics on the expansion side and pressure 1011 that are independent of each other, and the damping valve can be made into a relatively small return element, and the machining precision required for the part can be obtained. l2if? This has the effect of reducing the number of assembly steps.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional example. 2 to 6 are plan views of thin plates according to embodiments of the present invention, and FIG. 7 is a sectional view of a gas-filled field softener. Is Figure 8 the effect of the extension stroke? FIG. 9 is a sectional view of the damping valve taken along the line A--A in the figure. FIG. 10 is a cross-sectional view of the damping valve for explaining the effect of the compression stroke, and FIG. 11 is a cross-sectional view taken along the line B--B in the figure. FIG. 12 is a sectional view of the double cylinder shock absorber. 13th~
FIG. 19 is a plan view of each thin plate. 30... Placed valve, 31-35... Thin plate, 39A
~39E... valve hole, 42... tongue piece. Patent applicant: Kayayo Kogyo Co., Ltd. Figure 14 Figure 16 Figure 17 Figure 19 Figure 15 Figure 18

Claims (1)

[Scope of Claims] ■. In a hydraulic shock absorber having independent pressure-reducing force characteristics on the extension side and the compression side, a plurality of thin sheet metals on the valve hole and the tongue piece of which the sizes are changed in stages are sequentially arranged. Stack them up and secure the entire outer periphery to form a valve. A rose-shaped damping valve characterized by: 2. A center hole in a thin plate and multiple slits extending radially from the center hole? 2. The damping valve according to claim 1, further comprising a radial valve hole and a generally fan-shaped valve tongue.