JP2601396Y2 - Hydraulic shock absorber valve structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a valve structure in a hydraulic shock absorber.

[0002]

2. Description of the Related Art There have been various proposals for a valve structure in a hydraulic shock absorber, depending on the use of the hydraulic shock absorber and the magnitude of a generated damping force. For example, as shown in FIG. The following disadvantages have been pointed out in the valve structure of the piston portion P of the hydraulic shock absorber.

That is, this conventional hydraulic shock absorber is:
Piston rod 2 inserted to be able to protrude and retract into cylinder 1
An annular leaf valve 3 is provided on a piston portion P which is slidably housed in the cylinder 1 while being connected to the tip of
Having.

The leaf valve 3 is set to generate a compression-side damping force in the hydraulic shock absorber. The leaf valve 3 is interposed with the leaf valve 3 and serves as a spacer. The opening of the pressure-side port 4a, which is a port opened in the piston body 4, which is a valve seat member interposed in the valve body 2a, is opened and closed.

In this hydraulic shock absorber, although not shown, an extension port 4b is also formed in the piston body 4, and an extension damping member that opens and closes the opening of the extension port 4b. It also has a so-called valve for generating force.

The leaf valve 3 has a fixed inner circumferential end and a free outer circumferential end, that is, the inner circumferential end of the leaf valve 3 has a piston body 4.
And a lower end of a leg 5a which forms a part of a valve stopper 5 disposed above the leaf valve 3 and also functions as a so-called spacer and functions as an interposition member. The outer peripheral side end is disposed adjacent to the outer peripheral upper end of the piston body 4.

At the upper end on the outer peripheral side of the leaf valve 3, a disc 6 as a pressing member slidably disposed on the outer periphery of the leg 5a with the leg 5a of the valve stopper 5 as a spacer. Are adjacent to each other on the outer peripheral side.

Further, the disk 6 is caused to move the outer peripheral end of the leaf valve 3 by the urging force from a spring 7 serving as urging means disposed between the disk 6 and the upper valve stopper 5 so that the lower piston body 4 is moved downward. It is biased toward the upper end on the outer circumference side,
A so-called initial load is applied to the leaf valve 3.

Therefore, according to the valve structure of the conventional hydraulic shock absorber, the piston portion P is
At the time of the pressure side stroke descending in the inside, the hydraulic oil from the piston side chamber R2 which becomes the high pressure side is bent through the pressure side port 4a and the outer peripheral end of the leaf valve 3 so as to enter the rod side chamber R1 which becomes the low pressure side. Will flow in.

At this time, the disk 6 adjacent to the back surface of the leaf valve 3 rises against the urging force of the spring 7 to allow the outer peripheral end of the leaf valve 3 to bend.

When the hydraulic oil flows into the rod-side chamber R1 by bending the outer peripheral end of the leaf valve 3, a predetermined damping force, that is, a pressure-side damping force of a predetermined magnitude is generated. Become.

However, in the above-described valve structure, there is a fear that a predetermined damping force may not be generated as set.

That is, in the above-described valve structure, the generation of the set damping force is achieved by raising the disk 6 as the pressing member as set.
Is mounted on a part of the valve stopper 5 in sliding contact with the outer periphery of the leg 5a which also functions as a spacer and also functions as a spacer.

To explain a little, the disk 6 as a pressing member
Is formed so as to be as thin as possible in order to make its weight as light as possible and to make it easy to float, while its inner periphery is arranged in sliding contact with the outer periphery of the leg portion 5a of the valve stopper 5 as a spacer. Therefore, it is easy to be tilted when ascending and descending.

When the disk 6 is raised and lowered in an inclined state, the inner circumference of the disk 6 and the outer circumference of a member for interposing the disk 6, that is, the leg 5a of the valve stopper 5 in the illustrated example. A so-called galling phenomenon is caused between the disk 6 and the outer periphery of the disk 6, and the disk 6 cannot be smoothly moved up and down.

Therefore, as shown by an imaginary line in the figure, if the sliding contact portion on the inner periphery of the disk 6 is lengthened and the sliding contact stroke is lengthened, the disk 6 can move up and down without tilting. become.

However, when the inner sliding contact portion of the disk 6 is lengthened, a trouble that the component processing becomes troublesome at the time of manufacturing the component is caused, and the sliding resistance is increased by the longer sliding contact portion. Therefore, there is a fear that smooth ascent and descent can no longer be expected.

The present invention has been made in view of such a situation, and its purpose is basically to provide a hydraulic shock absorber in which a predetermined damping force is generated as set. More specifically, the present invention relates to a valve structure comprising discs adjacent to the back side of a leaf valve constituting a so-called valve and moving up and down with the operation of the leaf valve. When the discs that move up and down operate as expected, the leaf valves can be operated as set by operating as desired, and the hydraulic shock absorber that is most suitable for use as a hydraulic shock absorber It is to provide a valve structure of the vessel.

[0019]

Means for Solving the Problems To achieve the above-mentioned object, a means of the present invention comprises a leaf valve openably and closably provided at an outlet end of a port formed in a valve seat member;
A vertically movable pressing member adjacent to the back of the leaf valve;
A biasing means disposed on the back side of the pressing member, and a spacer for supporting a leaf valve and a base end of the biasing means, wherein the pressing member descends along the spacer by a spring force of the biasing means and leaves the leaf. In the valve structure of the hydraulic shock absorber for urging the valve in the closing direction, a locking ring is interposed between an inner circumference of the pressing member and an outer circumference of the spacer, and the locking ring is used to move the pressing member in a lateral direction. It is characterized in that it is prevented from moving to.

[0020]

Therefore, for example, when the leaf valve is set to generate a compression side damping force in the piston portion, the hydraulic oil from the piston side chamber which becomes the high pressure side during the compression side stroke in which the piston portion descends in the cylinder. Deflects the outer peripheral end of the leaf valve and flows into the rod side chamber on the low pressure side.

At this time, the pressing member adjacent to the back surface of the leaf valve rises against the urging force of the urging means,
The bending operation of the outer peripheral end of the leaf valve is allowed, and a predetermined damping force, that is, a compression damping force of a predetermined magnitude is generated when the outer peripheral end of the leaf valve bends.

At this time, the pressing member is provided in such a state that it can freely move toward the outer peripheral side of the spacer, that is, since the inner periphery of the pressing member is disposed without slidingly contacting the outer periphery of the spacer, No dynamic resistance is generated, and therefore, it rises smoothly without so-called resistance.

Then, in the reverse stroke, in which the piston portion rises in the cylinder, the pressing member smoothly descends above the leaf valve without resistance.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hydraulic shock absorber according to an embodiment of the invention.
Basically, it has the same configuration as the conventional hydraulic shock absorber shown in FIG.

Therefore, the same parts of the structure will be denoted by the same reference numerals in the drawings unless necessary, and detailed description thereof will be omitted. The valve structure which is a feature of the present invention will be described below. The description will focus on the parts.

That is, as shown in FIG. 1, even in the hydraulic shock absorber according to one embodiment of the present invention, the leaf valve 3 constituting the valve structure for the compression side damping force in the piston portion P is provided.
Is formed in an annular shape, the inner peripheral end is fixed, and the outer peripheral end is free.
Are arranged so as to be able to open and close the opening.

However, in the illustrated example, the leaf valve 3
Is configured in such a manner that a plurality of two annular leaf valleys 31 and 32 are laminated. In particular, the lower leaf valve 32 is provided with a notch that enables generation of the extension side damping force in a very low speed range. A portion 32a is formed.

The leaf valve 3 is also provided with an opening 3a facing the extension side port 4b formed in the piston body 4.

On the other hand, the disc 6 serving as a pressing member adjacent to the back surface of the leaf valve 3 is provided in this embodiment.
It is described that it is formed to be movable with respect to the spacer.

In the valve structure in the embodiment shown in FIG. 1, the positioning means for the disc 6, which is a pressing member, is provided separately from the urging means.

The disk 6, which is a pressing member, forms an annular gap 6a between the inner periphery thereof and the outer periphery of the spacer when the disk 6 is opposed to the inner periphery thereof. And a locking ring 8 serving as a positioning means is disposed in the annular groove 6b.

The locking ring 8 basically has only to be formed in a so-called ring shape.
As shown in the figure, the inner and outer circumferences have projections 8a and 8b. The outer circumference side projection 8a is adjacent to the bottom of the annular groove 6b, while the inner circumference side projection 8b is a spacer. (See FIG. 1).

The adjacent state of the protruding portions 8a and 8b on each side is set so as not to be in pressure contact but to make light contact.

In this embodiment, the spacer adjacent to the inner peripheral side protruding portion 8b is interposed between the front spigot portion 2a of the piston rod 2 and the space between the spacer and the leg portion 5a of the valve stopper 5. A cylindrical spacer 9 sandwiching the inner peripheral end of the leaf spring constituting the spring 7 serving as the urging means is provided.

In this embodiment, the locking ring 8 is set to have a circular cross section. However, as long as the protrusions 8a and 8b on the respective sides are formed, the cross section is Is a polygon such as a quadrangle, a cross, or U
The shape may be set to any other shape in consideration of various reasons, such as a character shape, manufacturability, durability, and slidability.

Further, in this embodiment, the spring 7 serving as the urging means is constituted by a leaf spring. The leaf spring is formed in an annular shape and has a so-called hole through which hydraulic oil flows. And instead, port 6 to disk 6
By forming c, communication between the so-called inner and outer peripheral sides of the disk 6 is enabled.

As described above, by forming the port 6c in the disk 6 and not forming a so-called hole or the like in the leaf spring, there is an advantage that the setting of the urging force in the leaf spring becomes easy.

Therefore, in the case of this embodiment, a spring 7 as urging means for urging the disk 6 as a pressing member toward the leaf valve 3 and a locking as positioning means for preventing the disk 6 from rolling. There is an advantage that the rings 8 and 8 can be designed independently and manufactured separately.

In the above description, the case where the leaf valve 3 constituting the valve structure according to the present invention is set to generate the compression side damping force at the piston portion P has been described as an example. Therefore, the leaf valve 3 may be set for generating the extension side damping force at the piston portion P. Instead of the piston portion P, the base valve portion may be used for generating the compression side damping force or the extension side damping force. It may be set for force generation.

When the leaf valve 3 is set to generate a compression-side damping force or an extension-side damping force at the base valve portion, the valve seat member is a valve block constituting the base valve portion, and a spacer is provided. However, even if there is a modification such as the fixing pin being used as a fixing pin, the function and effect are of course not different.

[0041]

As described above, according to the present invention, when the leaf valve is deflected, the pressing force which is adjacent to the back side of the leaf valve and rises against the urging force from the urging means is provided. Since the member is raised in its disposition position and does not generate sliding resistance between the spacer and the spacer, the pressing member can be smoothly raised and returned, and accordingly, a predetermined damping due to the operation of the leaf valve can be achieved. As a result, a valve structure that generates a force as set can be obtained.

As a result, according to the present invention, there is an advantage that it is possible to provide a hydraulic shock absorber in which a predetermined damping force is generated as set.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a hydraulic shock absorber according to an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of a locking ring.

FIG. 3 is a partial sectional view of a conventional hydraulic shock absorber.

[Explanation of symbols]

 Reference Signs List 3 leaf valve 4 piston body as a valve seat member 4a pressure side port as a port 6 disk as a pressing member 7 spring as a biasing means 8 locking rings 8a, 8b protrusion 9 spacer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-163233 (JP, A) JP-A-63-84438 (JP, U) JP-A-1-67345 (JP, U) JP-A-4-167 14840 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) F16F 9/00-9/58

Claims (1)

(57) [Scope of request for utility model registration] 1. A leaf valve openably and closably provided at an outlet end of a port opened in a valve seat member, a vertically movable pressing member adjacent to a rear surface of the leaf valve, and a rear surface of the pressing member. An urging means, and a spacer for supporting the base end of the leaf valve and the urging means are provided, and the pressing member descends along the spacer by the spring force of the urging means to urge the leaf valve in the closing direction. In the valve structure of the hydraulic shock absorber, a locking ring is interposed between the inner circumference of the pressing member and the outer circumference of the spacer, and the locking ring prevents the pressing member from moving in the lateral direction. Hydraulic shock absorber valve structure.