JPS59147132A - Hydraulic buffer - Google Patents

Abstract

PURPOSE:To reduce the dispersion of characteristic (resistance force) between articles, by restricting the eccentric part for adjusting resistance force, at a part, thus permitting the eccentric work having a high accuracy. CONSTITUTION:The radius Re of an eccentric part 19b is made always smaller than the sum of the radius Rc of the outer surface part of a cylinder and the amount l of eccentricity (Re<Rc+l), and the opposite side of the eccentric part certainly has a surface contact part. Since within a range Re<=Rc, a grindstone having a radius equal to Re can be inserted into the radius Rc, grinding work having high accuracy is achieved simply. The length in the axial direction of the eccentric part 19b is enough to be the length for covering an orifice 18. The outside surface area in nearly cylindrical form which is formed by the diameter (d) of the orifice 18 and the length (H) of an outlet part is the effective orifice area. Therefore, when the position of the eccentric part is varied by turning an adjusting housing 19 by theta1 and theta2, the length of the outlet part reduces to H' and H'' in succession, and the effective orifice area reduces in succession, and thus a high resistance force is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a koura j1 sluggish device using an eccentric f-yuzo.

Conventionally, as a Ura pressure class f+i device using the resistance force (1!a adjustment) due to eccentric team movement, Bokosho 5/I-38
270'; + Publication and Utility Model Publication No. 53-23915, etc., and in these products, an adjustment ring having an inner diameter larger than the center of the cylinder is arranged eccentrically as a whole, and the adjustment The ring is rotated about the axis of the cylinder so that it faces the orifice provided in the cylinder. The relationship is shown in FIG. 1 is a cylinder, 2 is an adjustment ring, and 3 is an orifice. 0
．． is the center of the cylinder and the center of rotation of the eye adjustment ring 2, and 02 is the center of the adjustment ring 2. Furthermore, H represents the length of the outlet of the orifice, and β represents the distance between the center of the cylinder and the center of the adjustment ring, that is, the amount of eccentricity.

FIG. 2 shows an axial sectional view, in which the pressure compressed by the piston 4 passes through the orifice 3 and flows outward from the flow passage 2' in a crescent shape. Set adjustment link 2 to 1 with 01 in the center.
1. The resistance force changes because the length II of the chair changes. In FIG. 1, the approximately cylindrical outer surface area formed by the diameter d of the orifice 3 and the outlet length H is the effective orifice area.

Figure 3 shows flange fittings 1 (2") on both ends of the adjustment ring 2.
It is designed to make the center of rotation of the hexagonal ring 2 smoother.

By the way, in the above-mentioned conventional technology, since the inner diameter of the eccentric tube (i.e., the X1la adjustment ring) is large, the diameter of the cylinder is large. 11i strong effect cannot be expected.

That is, the adjustment ring is independent and has no surface contact with the cylinder. In addition, in the eccentric method shown in Figure 2, it is necessary to guarantee the rotation r [cocenter] at ○I.

111j As a result, variations tend to occur in the resistance settings. Furthermore, it has the disadvantage of having a large outer diameter, making it unsuitable for use as a hydraulic shock absorber for small chairs.

Furthermore, the 3131st eccentric method requires very high processing accuracy. In other words, by eccentrically machining the inner surface (see Figure 1),
It is an absolute requirement to achieve the radius RG of the center of Oz, where the eccentric part l is taken at one point IE of radius RC, J:, and it cannot be said that such machining is extremely difficult at °C. I don't get it.

The present invention was made with the aim of eliminating the above-mentioned drawbacks of conventional devices, and includes an eccentric tube (adjusting ring).
This is characterized by an improvement in the shape of the cylinder, in which the eccentric part is limited to a part, and a part that is in close contact with the outer surface of the cylinder is provided on the opposite side of the eccentric part.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 4, the piston Lr (10) hits the iΦi protrusion at the left end of the figure. At the right end f, the piston 11 is fixed by a pin 12, and the spring 13 supports the piston rotor F l and pushes it outward.

Reference numeral 14 denotes a cylinder, and the bottom part thereof has a check valve composed of a metal ball 15 and a receiving pin lEi, which prevents /111 of @rX17 in the cylinder from flowing out from this part. However, the inflow of oil is free. On the 1st, the orifices are arranged in a straight line at intervals that produce a constant resistance force as before. 19, the right side portion 19a of the adjustment housing is rotatably and slidably fitted onto the outer surface of the cylinder I4, and the eccentric portion 19b
have. Furthermore, a sliding metal 20 of the piston rono F' 10, an oil seal 21, a dust seal 22.0 ring 23 are provided. Also, 19d is the oil flow path,
/11'' is the back side 1 of the screw 1-11 through the small hole 190.
Flows into 1a. 24 is the case body, outer surface ta1+ 24
2 is all-in-one and uses a stationary phase nut 25 to loosen this f! Take the j-equipment. In addition, the right end portion 24I) is bent inward.
#j Prevents internal parts from popping out during QWA. 26 is a supply/111 plug, and a hole enters the inside through a small hole 27.

28 is a notch that fixes the bottom part 14a of the link and the case body 24, and since there is an O-ring 29, there is no leakage from this part. 30 adjusts the Acyuno radar O piston Rono 1 ° River 0 approach body detection). In addition, 4-i l11. 'l is 1 knoll pin 3I, left side is δrta, and its movement is regulated by the end face 19C of the adjustable housing 19C. Akira 1! +I4 and the outer periphery of the housing sink 19 are rotated while in contact with the case body 24.
There is a retaining ring 31' in the receiving river.
is set up. 32 is fixed to the adjustment 70 sizing 19 from the rotation nozzle 33. Rice 3
3 also serves as a rotation support needle, and a scale plate 34 allows the rotation angle to be read.

Next, the eccentric portion 19b will be explained in detail as shown in FIG.
Details of the eccentric part are shown in a), and the radius Re of the eccentric part is much smaller than the sum of the cylinder outer surface radius Rc and the eccentricity β (17e< Rc-1-7, so the opposite side of the eccentric part is always As you can see from the figure, in the range of Re≦Rc, the grindstone with the same radius as Re will have a contact point with Rc.
Since it can be inserted within the radius, highly accurate grinding can be easily performed. Furthermore, when inspecting a finished product, it is possible to check based on the part that makes surface contact, making it easy to check using the j-method. The length of the eccentric portion 19b in the axial direction only needs to be long enough to cover the orifice, and no longer is necessary.

Next, the method of adjusting the orifice area, that is, the method of adjusting the resistance force, will be explained. As explained with reference to FIG.
The approximately cylindrical outer surface area created by the equation ÷ and length 1] is the self-effect merifice area. Therefore, Fig. 5 (
b), adjust the adjustment housing 19 to θ1, θ as shown in (C).
2 and change the position of the eccentric part 191), the length of the protrusion 11 will decrease to II' and 11'' in order,
As a result, the surface area of
This will generate a large resistance force.

Fig. 5 is a diagram with an eccentric part provided under the conditions that Rc' = Rc and 1) slightly larger than Hl' contacts the outer surface of the cylinder. Even if there is, the cylinder and the inner surface of the adjustment housing are in surface contact on the opposite side of the orifice. Therefore, it is possible to suppress the adjustment housing I9 from moving due to the ejection action from the orifice, and create a positive orifice area, which is an effect that could not be achieved with conventional mechanisms.

Finally, to explain specifically about the flow of water, when an impact is applied and the piston 11 pressurizes the oil inside the cylinder 17, the die at the bottom of the cylinder.

Since the oil valve (consisting of 15 and 16) is closed and oil cannot flow out from this part, oil is ejected from the orifice 18 (the orifice 18 is closed one after another as the screw 1 enters) As the shape changes, the area of the ejected part decreases, but this leads to a certain resistance force every 4 degrees). The oil flows from the small hole in the eccentric part 19 to the back side of the screw (11). flows into a.

That is, the ura will fit into the space created on the back surface of the piston.

Conversely, when the piston returns, the oil in the back surface of the piston passes from the small hole 9e through the flow path 19d to the inner and outer circumferential surfaces of the agulator 30 and the joint U surface (30 in FIG. 7).
It enters the inside of the cylinder [7 from the check valve through the small hole 27 from the part indicated by a). A portion flows into the cylinder through the orifice 18.

The present invention is as explained above, and since the eccentric part for adjusting the resistance force is limited to a part, an 11th degree 1:+J eccentric cutting [2] is created, which creates a characteristic between the items. (resistance force) variation is small, the adjustment housing plays the role of reinforcing the cylinder 4), and the diametrical expansion is not so large that the overall structure is well-organized and suitable for small-sized shock absorbers. has the effectζ
There is.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of a conventional device, in which FIG. 1 is a sectional view taken at right angles to the axial direction, and FIGS. 2 and 3 are sectional views taken in the axial direction. FIG. 4 and subsequent figures show embodiments of the present invention. FIG. 4 is a 141i plane view in the axial direction, and FIG.
l, (C1 is a cross-sectional view taken along the line 5-5 in Figure 4, and is an explanatory diagram 1 showing the method of adjusting the resistance force. Figure 6 is a cross-sectional view taken along the line 6-6 in Figure 4. Figure 7 is a cross-sectional view along the line 6-6 in Figure 4. 7-7 line force direction in Fig. 4 is a side view, and Fig. 8 is a side view seen from the 8-8 line direction in Fig. 4. l
i, i Adjustment housing +9b... Eccentric section agent Patent attorney Yujo - 2 other people (b) (c) Fig. 6 Fig. 7rIA Fig. 8, -179→

Claims (1)

[Claims] Outside the cylinder (1111 &: IM) In a pressure relief device in which the resistance force is adjusted by adjusting the length of the outlet section of the orifice provided in the cylinder with the adjustment housing eccentrically arranged, the cylinder of the adjustment housing 1. A hydraulic shock absorber characterized in that an eccentric portion of the cylinder is fixed to a portion, and a portion that is in close contact with the outer surface of a cylinder is formed on the opposite side of the eccentric portion.