JPH0297741A - Valve lift adjusting method - Google Patents

Abstract

PURPOSE:To obtain the characteristic of arbitrary damping force in a fine low speed region by interposing a lift amount adjusting valve thinner than the plate thickness of a spacer in a clearance between leaf valves generated by the spacer and providing a plate thickness difference between the adjusting valve and the spacer to correspond to a lift amount intended. CONSTITUTION:In a leaf valve mechanism 5, a leaf valve 51, adapted to a seat surface 11, and a leaf valve 54 in the rear are parallelly placed interposing spacers 52, 53, and an annular lift amount adjusting valve 55 thinner than a laminated plate thickness of the spacers 52, 53 is interposed being glued to a side of the leaf valve 54 in a clearance between the leaf valves 51, 54. In this way, the clearance (d) serves as a lift amount when the leaf valve 51 is deflected. Thus enabling the lift amount to be formed smaller than the plate thickness of the spacer, the damping force characteristic, eliminating its limitation in a fine low speed region of piston movement by external vibration, is able to correspond to various damping force values.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for adjusting the lift amount of a leaf valve applied to a piston valve in a shock absorber, etc., and in particular, to a method for adjusting the lift amount of a leaf valve applied to a piston valve in a shock absorber, etc. Eliminate restrictions and reduce R in the very low speed region of piston movement
The present invention relates to a means for obtaining a leaf valve that can increase the degree of freedom in determining force characteristics.

(Prior Art) As is well known in the art, the piston of this type of shock absorber etc. is provided with an in restriction portion for the hydraulic fluid moving between the upper and lower chambers in the cylinder divided by the piston.
There is no damping force for piston vibration caused by external vibration.

This gtJi regulating section has a fixed orifice installed in the flow path, and the generated damping force characteristic based on the flow rate restricted by this is a square characteristic, whereas in the flow regulating section consisting of a leaf valve, the damping force characteristic is a square characteristic. The lift of the valve is determined according to the difference in chamber pressure between the upper and lower chambers, and the hydraulic oil flows through the gap between the seat surface and the leaf valve. The damping force characteristics at this time exhibit a proportional type over a wide range up to the high speed region.

Conventionally, the amount of lift in this case has been determined by the thickness of the plate inserted between the leaf valves.

(Hf to be solved by the invention) 1. The variable elements of the damping force generated in the very low speed region of the leaf valve are the bending rigidity and valve lift amount based on the plate thickness of the leaf valve and the outer diameter of the cantilever, etc. Especially in the current situation where it is impossible to set the Kanza plate thickness to 0.114L or less due to processing limitations, the characteristics of the lFJ! damping force generated due to the Kanza plate thickness. was decided.

Therefore, the purpose of t51 of the present invention is to widen the setting range of the lift amount in the leaf valve to a narrower range, thereby making it possible to obtain arbitrary damping force characteristics in the very low speed region. There is a particular thing.

(Means for Solving the Problems) Therefore, in order to achieve this object, in the present invention,
For a Kanza whose plate thickness is sufficiently thicker than the intended lift amount, a lift amount adjustment valve made of a plate thinner than the previous Kanza plate thickness is interposed in the gap between the leaf valves created by the Kanza, and this is done. We propose a valve lift adjustment method that makes the difference in plate Ig between the equal adjustment valve and the Kanza correspond to the intended lift μ.

(Function) In other words, the gap between a pair of leaf valves standing side by side is the lift amount of the leaf valve on the seat side1, but the machining accuracy etc. of the Kanza sandwiched between these leaf valves is not sufficiently compensated for. Thickness is used.

As a result, the space between the leaf valves has the above-mentioned Kanza plate thickness, but on the other hand, the plate thickness of the lift adjustment valve interposed between the leaf valves is thinner than the above-mentioned Kanza plate thickness, and -1
By making the difference with the Kanza plate thickness smaller than the conventionally set limit thickness, the gap between the Moeki Kanza plate thickness and the gap between the leaf valves filled by the adjustment valve, that is, the lift acid, can be used as the difference in the plate thickness. You can decide.

(Example) Next, a preferred embodiment of the present invention will be described in detail.

FIG. 1 is a longitudinal cross-sectional view of the main part showing one embodiment of the present invention, in which a piston 2 fixed at the tip of a piston rod 3 by a seat 4 moves inside a cylinder l, which partitions the cylinder. The inner chambers A and B are filled with hydraulic oil.

On the other hand, passages 6 and 7 are opened in the piston 2 and communicate between the chambers A and 8, and a non-return valve is energized by a spring 10 on the valve seat surface 8 of the passage 6 on the chamber A side. A leaf valve mechanism 5 that generates a rebound damping force is disposed on the valve seat surface 11 of the other passage 7 on the chamber B side.

As shown in an enlarged view in FIG. 2, the leaf valve mechanism 5 includes a leaf valve 51 in contact with the seat member 11 and a rear leaf valve 54, with caps 52 and 53 sandwiched between them. An annular lift chamber adjustment valve 55 which is arranged side by side and is made of a thinner plate than the combined plate thickness of the two cans 52 and 5 is installed between the leaf valve 54 and the gap between the two leaf valves 51 and 54. Stones form unevenly and are intercalated.

As a result, a gap d is formed between the leaf valve 5I and the lift amount adjustment valve 55, which is narrower than the thickness of either of the cans 52 or 53.
is the lift amount when the leaf valve 51 is deflected.

That is, during the extension stroke of the piston movement due to external vibration, the hydraulic oil in the chamber A side that is pressurized passes through one passage 7 and reaches the leaf valve mechanism 5, and at that time, the hydraulic fluid between the two chambers A and 8 is In response to the pressure difference, the leaf valve 51 of the mechanism 5 is flexed to open from the valve seat surface 11, and the chamber B passes through this.
flows to

The lift amount of the leaf valve 5t at this time is the difference in plate thickness (gap d) between the cans 52 and 53 and the lift resistance adjustment valve 55.

Moreover, it is possible to select a wide variety of combinations of Kanza 52.5 and lift ridge valve 55 from the already prepared general-purpose Kanza and leaf valve materials, and as a result, The selection range of this lift amount can be widened, especially in a narrow range.

In addition, the lift adjustment for the leaf valve mentioned in L is as follows:
In addition to adjusting the compression side damping force using the piston valve in the first illustrated embodiment, the present invention can also be applied to a leaf valve mechanism for adjusting the compression side damping force using the base valve.

Note that the jumpers 52 and 53 may be constructed of a single thick plate, or the lift amount adjusting valve 55 may be replaced with a plurality of stacked valves.

FIG. 3 is an enlarged cross-sectional view of the main part of the advanced embodiment of the present invention, and FIG. 4 is a perspective view of the leaf valve. In addition to the configuration of the first illustrated embodiment, a leaf valve 5! The boat 56 was opened.

Therefore, when the hydraulic oil from the chamber A side passes through the passage 7 and reaches the leaf valve machine a5, in an area where the pressure difference between the chambers A and 8 is small and the flow rate is low, it passes through the port 5G and passes through the gap d. It flows into the chamber B due to the resistance of the flow path when passing through the chamber.

Therefore, the damping force at this time is determined by the gap d as a flow path resistance element, and as shown by the solid line in the characteristic diagram shown in Figure 5, compared to the case where only the leaf valve structure is shown in the same dotted line, the damping force in that part is is a square characteristic due to orifice regulation.

When the flow rate is even higher, the leaf valve 51 is bent and closes the gap d while opening to the leaf surface 11. In this state, the leaf valve 54 is bent as in the first illustrated embodiment. Valve characteristics include bending rigidity.

Of course, even in this case, the characteristics in the very low speed region due to the selection of the gap d, that is, the determination of the lift amount, are determined by the first
This is similar to that in the illustrated embodiment.

(Effects of the Invention) As described above, according to the present invention, for a plane whose plate thickness is sufficiently thicker than the intended lift amount, the gap between the leaf valves created by the plane is thicker than the thickness of the previous plane. By interposing lift amount adjustment valves with thin plate thickness and making the difference in plate thickness between these adjustment valves and the Kanza correspond to the intended lift amount, the leaf valve can be adjusted without having to process the Kanza itself to be thin. The lift amount can be made as narrow as possible than the Kanza plate thickness, thereby eliminating restrictions on damping force characteristics in the very low speed region of piston movement due to external vibration, and reducing various restrictions on damping force characteristics. It is now possible to deal with various damping force values by eliminating
According to this T-stage, the machining accuracy of the Kanza and leaf valves can be made extremely high, so that the selected lift amount can be obtained with high precision and stability.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a sectional view of essential parts showing one embodiment of the method of the present invention, Fig. 2 is a partially enlarged view thereof, and Fig. 3 is a sectional view of a further embodiment of the method of the present invention. Cross-sectional view showing the main part enlarged, No. 4
The figure is a perspective view of the leaf valve in the third illustrated embodiment, and FIG. 5 is a damping force characteristic diagram in the above embodiment. (Explanation of symbols)

Claims (1)

[Claims] For a Kanza whose plate thickness is sufficiently thicker than the intended lift amount, a lift amount adjustment valve made of a plate thinner than the previous Kanza plate thickness is interposed in the gap between the leaf valves created by the Kanza, and this is done. A valve lift adjustment method characterized in that the difference in plate thickness between the volume adjustment valve and the Kanza is made to correspond to the intended lift amount.