JP4666780B2 - Hydraulic shock absorber valve support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve support structure for a hydraulic shock absorber, and more particularly to a support structure for a leaf valve for generating a damping force provided in a piston.
[0002]
[Prior art]
In general, a piston or base valve case of a hydraulic shock absorber is provided with a leaf valve for generating damping force at the end of a port communicating with two oil chambers, and this leaf valve is connected to a piston nut via a ring seat. Or it is supported by the valve holder.
[0003]
That is, for example, a conventional hydraulic shock absorber shown in FIG. 5 has been developed. In this hydraulic shock absorber, two upper and lower oil chambers A and B are defined in a cylinder 1 via a piston 2, and the two oil chambers A and B communicate with each other via a port 3 provided in the piston 2. A leaf valve 4 for generating an extension side damping force is provided at the outlet end of the valve so as to be freely opened and closed. The lower surface of the base end side of the leaf valve 4 is supported by a small-diameter ring seat 5, and the lower surface of the ring seat 5 is supported by an upper end surface 6 of a piston nut 8 that is screwed into a piston rod 7 and fastened. Is.
[0004]
[Problems to be solved by the invention]
However, the conventional valve support structure as described above has the following problems.
[0005]
That is, the above-described piston nut 8 is generally formed by forging, but the support surface 6 of the ring seat 5 that is the upper end surface of the piston nut 8 is not necessarily formed uniformly during this forming. .
[0006]
For example, uneven unevenness is formed on the upper end support surface 6 of the piston nut 8, becomes a medium height, or becomes an outer height, and the support position of the ring seat 5 varies, and as a result, the damping force also varies. Will occur. When the support surface 6 is medium-high, the support of the ring seat 5 is unstable, and the damping force is lower than that of the outer height, and the damping force is also unstable. For this reason, the support surface 6 of the piston nut 8 may be a smooth surface or molded to an outer height surface, and the ring seat 5 may be supported by the smooth surface or the outer edge of the outer height. Since the support surface 6 varies, it is necessary to smooth the support surface 6 by cutting or the like or to correct it to the outer height each time. For this reason, the number of man-hours is increased by cutting, and the mass productivity is extremely low.
[0007]
Therefore, the object of the present invention is to form the support surface of the piston nut and the valve presser in advance to an outer height surface in advance, eliminating the need for post-processing such as cutting, and always supporting the ring seat at the same position. It is another object of the present invention to provide a valve support structure for a hydraulic shock absorber that can improve the stability of the ring seat and the stability of the damping force.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, one means of the present invention is to provide a hydraulic shock absorber in which a ring seat is provided on the upper or lower surface of the base end side of the leaf valve, and the leaf valve and the ring seat are fastened and fixed by a piston nut . In this valve support structure, the outer edge of the ring seat support surface of the piston nut is formed high in advance, and the ring seat is stably supported by this outer edge.
[0009]
Similarly, the other means is a valve support structure for a hydraulic shock absorber in which a ring seat is provided on the upper or lower surface of the base end side of the leaf valve, and the leaf valve and the ring seat are fastened and fixed by a piston nut. The annular seat support surface of the piston nut is formed as a conical surface that inclines downward from the outer edge toward the inner edge, and the annular seat is stably supported by the outer edge of the conical surface.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
1 and 2 show an embodiment of the present invention , in which a ring seat 5 is provided on the lower surface of the base end side of the leaf valve 4, and the leaf valve 4 and the ring seat 5 are tightened when the piston nut 8 is tightened. The piston nut 8 is pressed against the piston 2 side by a ring seat support surface 6a formed at the center of the end surface of the piston nut 8, and is fastened and fixed.
In this case, the outer edge of the ring seat support surface 6a of the piston nut 8 is formed high in advance, and the ring seat 8 is stably supported by this outer edge.
[0012]
As in the prior art of FIG. 5, the hydraulic shock absorber has a piston rod 7 movably inserted into a cylinder 1 via a piston 2, and the piston 2 is inserted into the cylinder 1 with an upper oil chamber A and a lower oil chamber B. Is partitioned. In this embodiment, the support structure of the leaf valve 4 provided on the piston 3 will be described, but it can also be applied to the valve support structure on the base valve side, and the piston nut 8 will be described as a member for supporting the valve. This can also be applied to the structure of the valve holder.
[0013]
1 and 2, the piston 2 is formed with an extension port 3 and a pressure port 9 communicating with two oil chambers A and B, and the outlet side of the extension port 3 has one or more stacked extension sides. A leaf valve 4 serving as a damping valve is provided so as to be openable and closable. A lower surface of the base end side of the leaf valve 4 is supported by a small-diameter ring seat 5. The combined piston nut 8 is supported by a support surface 6a which is the upper end surface.
[0014]
The piston nut 8 erects a boss 10 at the center of the upper end, and uses the upper end surface of the boss 10 as a support surface 6a.
[0015]
The support surface 6a has a higher outer edge, and the outer edge supports the lower surface of the ring seat 5 along the circumferential direction. When making an outer edge high, it is good also as a cyclic | annular high support part, and you may provide a plurality of high convex parts uniformly along the circumferential direction.
[0016]
Further, as shown in the figure, the support surface 6a is formed as a conical surface having a tapered surface that slopes downward from the outer edge toward the inner edge, and the lower surface of the ring seat 5 is circumferentially formed by the high outer edge of the conical surface. You may support uniformly along.
[0017]
The support surface 6a is formed so as to positively increase the outer edge in advance by a forging press or the like during forging.
[0018]
Therefore, when the piston nut 8 is molded, the support surface 6a having an outer height is already molded when the product is manufactured, and it is not necessary to cut the outer surface by molding in the post-processing, and the piston having a uniform support portion in advance. You can get a nut.
[0019]
3 and 4 show another embodiment of the present invention , in which a ring seat 5 is provided on the lower surface of the base end side of the leaf valve 4a, and the leaf valve 4a and the ring seat 5 are connected to the piston nut 8Aa. At the time of tightening, it is pressed against the ring seat support surface 6a piston 2 formed outside the end surface of the piston nut 8a to be fastened and fixed.
In this case, the ring seat support surface 6A of the piston nut 8a is formed as a conical surface that inclines downward from the outer edge toward the inner edge, and the ring seat 5 is stably supported by the outer edge of the conical surface. .
[0020]
In this case, the damping valve includes a plurality of leaf valves 4a, a support plate 11 that supports the outer edge of the leaf valve 4a, and a spring 12 that supports the lower portion of the support plate 11.
[0021]
The lower surface of the base end side of the leaf valve 4 a is supported by a small-diameter ring seat 5, and the lower surface of the ring seat 5 is supported by an upper end support surface 6 a of a piston nut 8 a screwed below the piston rod 7.
[0022]
As in the case of FIG. 2, the support surface 6 a is formed with a high outer edge side, and the ring seat 5 is uniformly supported by the outer edge. The structure and processing means of the support surface 6a are the same as in the embodiment of FIG.
[0023]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0024]
(1) According to the invention of each claim, since the annular seat support surface of the piston nut is positively formed in advance so as to have an outer height, the outer seat can be uniformly supported by the outer edge of the outer height. Accordingly, the ring seat is stably supported, and as a result, the leaf valve is also flexed stably, so that a stable and uniform damping force can always be obtained.
[0025]
(2) Similarly, by setting the ring nut support surface of the piston nut to an outer height in advance, the support of the damping force value can be reduced in the range from the maximum to the minimum tolerance. That is, even if there is some unevenness as a product of the piston nut, the influence on the unevenness of the damping force is small, and the structure becomes insensitive to the variation of the damping force.
[0026]
(3) Since the support surface is preliminarily molded so as to have an external height, post-processing such as cutting is not required to achieve an external height, making the molding easy, reducing costs, and mass production. Suitable.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a valve support structure of a hydraulic shock absorber according to an embodiment of the present invention.
FIG. 2 is a partially enlarged cross-sectional view of FIG.
FIG. 3 is a longitudinal front view of a valve support structure for a hydraulic shock absorber according to another embodiment.
4 is a partially enlarged cross-sectional view of FIG. 3. FIG.
FIG. 5 is a longitudinal front view of a conventional hydraulic shock absorber.
[Explanation of symbols]
4, 4a Leaf valve 5 Ring seat 6a Support surface 8, 8a Piston nut

Claims (2)

In the valve support structure of the hydraulic shock absorber in which a ring seat is provided on the upper or lower surface of the base end side of the leaf valve, and the leaf valve and the ring seat are fastened and fixed by a piston nut, the ring seat support surface of the piston nut A valve support structure for a hydraulic shock absorber, wherein an outer edge of the hydraulic shock absorber is molded in advance and the ring seat is stably supported by the outer edge. In the valve support structure of the hydraulic shock absorber in which a ring seat is provided on the upper or lower surface of the base end side of the leaf valve, and the leaf valve and the ring seat are fastened and fixed by a piston nut, the ring seat support surface of the piston nut A valve support structure for a hydraulic shock absorber, wherein the ring seat is stably supported at the outer edge of the conical surface.

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