JPS6231705Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic shock absorber with adjustable damping force, which is disposed between a vehicle body such as an automobile and an axle.

BACKGROUND ART Hydraulic shock absorbers whose damping force can be adjusted according to driving conditions have been known in the past in order to improve the ride comfort or driving stability of automobiles. FIG. 1 shows the structure of such a conventional hydraulic shock absorber.

First, to explain this, numeral 1 is a cylinder filled with hydraulic fluid, and numeral 2 is a piston rod that protrudes through one end of the cylinder 1 in a sealing manner. 3 is slidably inserted into the cylinder 1, and the inside of the cylinder 1 is connected to an upper liquid chamber 4 and a lower liquid chamber 5.
It is separated into two chambers, and the upper part. This piston is equipped with a damping force generating means 6 that creates a flow resistance in the hydraulic fluid displacing and flowing between the lower fluid chambers 4 and 5.

7 is formed into a cylindrical shape as a whole, and inside it,
It includes an adjuster housing part 8 and an axial hole 9 that communicates the inside of the adjuster housing part 8 with the lower liquid chamber 5.
This is a stud that connects the piston rod 2 and the piston 3, and the cylindrical wall of this stud 7 is provided with orifices 10, 11, 12 that open into the upper liquid chamber 4.
These orifices 10, 1
1 and 12 are arranged in the circumferential direction with mutually different opening diameters, as shown in FIG.

In the adjuster accommodating portion 8 of the stud 7, an adjuster 14 rotatably driven by a motor 13 housed in the hollow interior of the piston rod 2 is rotatably accommodated. , an axial through hole 15 opening toward the lower liquid chamber 5
A communication hole 16 is formed which can selectively communicate between this hole 15 and any one of the orifices 10, 11, and 12 of the stud 7 (see FIG. 2).

Note that 17 is a deceleration mechanism that decelerates the rotation of the motor 13, and 18 extends from the deceleration mechanism 17.
a drive shaft of the adjuster 14; 14 is the drive shaft of the adjuster 14;
This is a position detection sensor that detects the rotational position of the
Moreover, the stud 7 has a flange 7a thereof,
The piston rod 2 is fixed by being tightened and fixed to the lower end of the piston rod 2 by a threaded member 21 screwed into a cylindrical member 20 fixed to the outer periphery of the piston rod 2.

In this configuration, the up and down movement of the piston rod 2 together with the piston 3 causes hydraulic fluid to flow between the upper and lower fluid chambers 4, 5 via the damping force generating means 6 provided on the piston 3, and a damping force is obtained. At the same time, an adjuster 14 is rotated by a predetermined angle via a motor 13 based on a control signal from a controller (not shown) to connect a communication hole 16 provided in the adjuster 14 with an orifice having a desired opening diameter, for example the orifice 10, among a plurality of orifices 10, 11, 12 provided on the stud 7. This causes a portion of the hydraulic fluid flowing between the upper and lower fluid chambers 4, 5 to bypass the orifice 10, thereby adjusting the damping force obtained by the damping force generating means 6 to obtain a desired damping force.

By the way, in order to obtain the required opening area of the orifice, the relative position of the communicating hole 16 of the adjuster 14 and, for example, the first orifice 10, which serves as a reference for alignment, must be accurately positioned as shown in FIG. must be matched.

However, in the conventional hydraulic shock absorber, the communication hole 16 of the regulator 14 and, for example, the first orifice 10
As shown in Figure 4, the alignment with
A drive shaft 18 (fifth shaft) extending from the reduction gear mechanism section 17
(see figure), fit the slit portion 14a provided on the head of the adjuster 14, then attach the stud 7 so that the adjuster 14 is accommodated in the adjuster housing recess 8, and then, This is done by looking into the shaft hole 9 provided in the stud 7 from the distal end surface 7b side of the stud 7 and aligning the first orifice 10 of the stud 7 with the communication hole 16 of the regulator 14. . In this way, conventionally, the communicating hole 16 of the adjuster 14 and the first orifice 10 of the stud 7 are aligned visually, so as shown in FIG. Although consideration has been given to making the aperture diameter _l2 of the aperture 8 sufficiently larger than the aperture diameter _l1 of the aperture 8 to provide a margin for their positional deviation, as shown in FIG. There were cases in which the center of the hole 16 and the center of the first orifice 10 did not coincide, and therefore they could not be accurately aligned with each other.

Furthermore, in the conventional hydraulic shock absorber, when fixing the stud 7 to the piston rod 2, the screw member 21 is tightened and screwed into the cylindrical member 20 fixed to the piston rod 2. Although the stud 7 is fixed, even if the first orifice 10 is accurately aligned with the communication hole 16 of the adjuster 14, when tightening the screw member 21,
As the annular member 21 is tightened, the stud 7 itself may rotate, and as a result, there is a risk that the relative position between the communication hole 16 and the first orifice 10 will be misaligned.

As described above, if the alignment between the communicating hole 16 of the adjuster 14 and the first orifice 10 of the stud 7 is not set accurately, the first orifice 10
When the adjuster 14 is rotated by a predetermined angle in several stages from 0 to the third orifice 12, the communication hole 16 is
0 and the second orifice 11, the communication hole 16 and a predetermined orifice, for example, the second orifice 11, may no longer communicate completely or they may communicate incompletely. I will do it. Therefore, there was a drawback that a predetermined opening area of the orifice could not be obtained, making it difficult to adjust the required damping force.

The present invention was proposed in view of these conventional drawbacks, and the gist of the present invention is to attach one end of a rod-shaped jig to the part of the adjuster that corresponds to the shaft hole formed in the stud. An engaging recess having a shape compatible with the positioning part formed in the holder is formed, and
The present invention is characterized in that an engaging portion is formed at the lower liquid chamber side end of the stud to engage with a locking portion formed at the other end of the jig.

An embodiment of the present invention will be described below with reference to the drawings. Note that the same components as those in the conventional example described above are given the same reference numerals, and redundant explanation thereof will be omitted.

FIG. 7 is a cross-sectional view showing the main parts of the hydraulic shock absorber according to the present invention, FIG. 8 is a cross-sectional view taken along the line - in FIG.
FIG. 9 is a perspective view showing an example of a rod-shaped jig (hereinafter simply referred to as "jig") used in the hydraulic shock absorber of the present invention.

That is, as shown in FIG. 7, the adjuster 14 accommodated in the adjuster housing portion 8 of the stud 7 has the following:
A positioning portion 32 having a non-circular cross section is formed on one end 28a of a rod-shaped jig 28 as shown in FIG. 9, which is inserted into the shaft hole 9 of the stud 7 from the lower liquid chamber 5 side.
An engagement recess 31 is formed in a shape that matches the shape of the engagement recess 31 . Further, at the end 7b of the stud 7 on the side of the lower liquid chamber 5, engaging parts 30, 30 that engage with the locking parts 29, 29 formed on the other end 28b of the jig 28 are provided.
is formed. Here, the engaging portion 30 and the engaging recess 31 are connected to the orifices 10, 11, and
12, the communication hole 1 provided in the regulator 14 with respect to the reference orifice 10, for example, the orifice 10.
6 is selected and formed so that it matches correctly. In this embodiment, as shown in FIG. 8, the engagement recess 31 formed in the adjuster 14
is formed into a square shape to match the shape of one end 28a of the jig 28, while the engaging portion 3 formed on the stud 7
0, 30 is a jig 2 whose entire shape is approximately T-shaped.
A locking portion 29 forming a part of the handle portion 28c of No. 8,
A notch is formed in a slit shape so as to match the size 29.

Next, in the hydraulic shock absorber of the present invention having the above configuration, an example of the procedure for aligning the communication hole of the regulator and one orifice of the stud will be described.

First, one end 28a of the jig 28 is inserted in advance into the shaft hole 9 of the stud 7, and the locking portions 29, 29 formed on the other end 28b are inserted into the end 7b of the stud 7.
It is engaged with the engaging portions 30, 30 formed in the above. In this case, the locking parts 29, 29 are the engaging parts 30,
The slits 30a, 30a constituting the
(see figure).

Next, the stud 7 to which the jig 28 has been engaged in advance in the above-described procedure is opposed to the adjuster 14 operatively connected to the drive shaft 18, and the first
As shown in FIG. 1, the stud 7 is inserted into the adjuster accommodating recess 8 formed in the stud 7 so as to accommodate the adjuster 14 therein. At this time, adjuster 14
If the communicating hole 16 formed at Since it should not fit with the engaging recess 31 provided in the positioning part 32, it cannot be inserted into the positioning part 32 and the mating recess 31. In such cases, stud 7
, along with the jig 28 and the positioning part 32 of the jig 28
The adjuster 14 is rotated about its rotation center axis until it fits into the engagement recess 31 and is fitted into the engagement recess 31. When the positioning part 32 is inserted into the engagement recess 31, the first orifice 10 of the stud 7 is accurately aligned with the communication hole 16 of the adjuster 14, as shown in FIG. becomes.

In this way, the positioning portion 32 of the jig 28
is fitted into the engagement recess 31 on the side of the adjuster 14, and then the screw member 21 is tightened and screwed into the threaded portion 20a of the cylindrical member 20 fixed to one end of the piston rod 2. The positioning part 32 is fitted and fixed in the engagement recess 31, and each of the locking parts 29, 29 of the jig 28 is inserted into the engagement part 30,
30, the stud 7 does not rotate as a result of tightening the screw member 21. Therefore, the communication hole 16 of the adjuster 14 and the orifice serving as a reference For example, when the relative position with the orifice 10 is correctly matched, the stud 7 is connected to the piston rod 2.
can be tightened and fixed with a screw member 21.

Next, FIGS. 12A and 12B show a second modification of the engaging portion formed at the tip of the stud. The main difference between this modification and the above-mentioned embodiment is that in the above-mentioned embodiment, the two locking portions 29, 29 of the approximately T-shaped jig 28 are engaged as shown in FIG. As shown, a pair of slit-shaped engagement parts 30, 30 are formed at the end 7b of the stud 7, whereas in this modification, a square column-shaped engagement part 30 is formed at the lower end of the shaft hole 9 of the stud 7. This is the point where an engaging portion 43 is formed. In addition, in the case of such a modified example,
For example, as shown in FIG. 12C, the engaging portion 43
It is sufficient to use a jig 45 having a locking portion 44 at the other end 45b having a shape that matches the above.

Next, FIGS. 13A and 13B similarly show a third modification of the engaging portion. In this modification, four engaging portions 46 are formed at the ends of the shaft hole 9 of the stud 7 radially from the center of the shaft hole 9. In the case of such a modification, for example, the first
As shown in FIG. 3C, a jig 48 may be used which has a locking part 47 at the other end 48b having a shape that matches each of the engaging parts 46.

In this way, Fig. 12 A, B and Fig. 13 A,
Even in the case of the second and third modified examples shown in B, the same positioning as in the above-mentioned embodiment can be performed.

FIGS. 14A and 14B and FIGS. 15A and 15B show second and third modifications of the engagement recess formed in the adjuster.

In the second modification of the engagement recess shown in FIGS. 14A and 14B, the upper end surface 15a of the through hole 15 of the adjuster 14 has a
An engaging recess 51 consisting of a cylindrical hole 49 and a pair of notches 50, 50 formed at both ends thereof is formed, and a third modification of the engaging recess shown in FIGS. 15A and 15B is In the example, the through hole 15 of the adjuster 14
An engagement recess 54 consisting of a cylindrical hole 52 and a substantially cross-shaped groove 53 formed in the hole 52 is formed on the inner upper end surface 15a.
is formed.

In this way, Fig. 14 A, B and Fig. 15 A,
In the case of the engagement recesses 51 and 54 shown in B, the adjuster 14 is similar to the engagement recess 31 used in the above embodiment.
The communication hole 16 is connected to a predetermined orifice 10 or 12.
It can be used as a means for aligning the position.

As is clear from the above description, the present invention forms an engaging recess shaped to match the positioning part formed at one end of the rod-shaped jig in a portion of the rotatable adjuster that corresponds to the shaft hole of the stud. At the same time, since the end of the stud on the lower liquid chamber side is formed with an engaging portion that engages with the locking portion formed at the other end of the rod-shaped jig, assembly can be easily performed by using the jig. At times, the communicating hole of the adjuster and the predetermined orifice formed in the stud can be accurately aligned easily and quickly.

In addition, the present invention makes it possible to easily construct an alignment mechanism for accurately aligning the communication hole of the regulator and the orifice of the stud by making some improvements to existing regulators and studs. Therefore, it is possible to provide a hydraulic shock absorber that is inexpensive and suitable for mass production.

Furthermore, with the present invention, the stud can be fixed to the piston rod using a jig with the communication hole of the adjuster and the predetermined orifice of the stud accurately aligned. When tightening and fixing, the stud itself does not rotate, so it is possible to tighten and fix both while accurately aligning them.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of a conventional hydraulic shock absorber.
Fig. 2 is a partially omitted perspective view showing the regulator, Fig. 3 is a sectional view taken from each orifice position, and Fig. 4 is an exploded sectional view showing an example of the order in which a conventional hydraulic shock absorber is assembled. , Fig. 5 is a partially omitted perspective view showing the drive shaft of the reduction gear mechanism section, Fig. 6 is a cross-sectional view showing the state in which the communicating hole of the adjuster is installed with a deviation from one orifice, and Fig. 7 8 is a cross-sectional view of a main part showing an embodiment of the present invention, FIG. 8 is a cross-sectional view taken along the line -- in FIG. 7, FIG. 9 is a perspective view of a rod-shaped jig, and FIG. 11 is a cross-sectional view of the main part showing the state before aligning the communication hole of the adjuster and a predetermined orifice using a rod-shaped jig, and FIGS. Main part sectional view and bottom view showing a modification, 1st
FIG. 2C is a perspective view showing an example of a rod-shaped jig used in the engagement portions of FIGS. 12A and B, and FIGS. 13A and B are sectional views of essential parts showing a third modification of the engagement recess. and a bottom view, FIG. 13C is a perspective view showing an example of a rod-shaped jig used in the engaging portions of FIGS. 13A and B, and FIG. 14A
15A and 15B are a sectional view and a bottom view of a main part showing a second modification of the engagement recess of the adjuster, and FIGS. 15A and B are a sectional view and a bottom view of a main part showing a third modification of the engagement recess of the adjuster. It is. 1...Cylinder, 2...Piston rod, 3...
...Piston, 4...Upper liquid chamber, 5...Lower liquid chamber,
6... Damping force generating means, 7... Stud, 9...
Shaft hole, 10, 11, 12... Orifice, 14...
...Adjustor, 15...Through hole, 16...Communication hole, 2
8, 45, 48... Jig (rod-shaped jig), 29, 4
4, 47... Locking portion, 30, 43, 46... Engaging portion, 31, 51, 54... Engaging recess.

Claims (1)

[Scope of utility model registration request] A cylinder filled with hydraulic fluid, a removable piston rod that extends through one end of the cylinder in a liquid-tight manner, and two upper and lower piston rods that are slidably inserted into the cylinder. A piston is provided with a damping force generating means that is separated from each of the lower liquid chambers and allows limited flow of hydraulic fluid displacing and flowing between the two liquid chambers, and this piston is linked to the piston rod. A cylindrical stud having a shaft hole whose one end opens into the lower liquid chamber and a plurality of orifices that allow communication between the shaft hole and the upper liquid chamber; and a cylindrical stud rotatably housed inside the stud. and a regulator having a communication hole that can communicate with any one of the plurality of orifices, the regulator having a regulator inserted into the shaft hole of the stud from the lower liquid chamber side. An engaging recess is formed in a shape that matches the positioning part with a non-circular cross section formed at one end of the rod-shaped jig, and the other end of the rod-shaped jig is formed at the lower liquid chamber side end of the stud. 1. A hydraulic shock absorber comprising an engaging portion that engages with a locking portion formed in the hydraulic shock absorber.