JPS59197638A - Liquid pressure buffer - Google Patents

Abstract

PURPOSE:To facilitate matching between a plurality of orifices in a tubular member and communication holes in a regulating chip by splitting into a tubular main piston rod and a sub-piston rod secured with a tubular member containing a damping force regulating chip. CONSTITUTION:A piston rod is splitted into main piston rod 48 and sub-piston rod 50 to be contained dismountably in a tubular section of said rod. Electric parts 44 such as a rotary drive 26, rotary angle position detector 41 are contained in said tubular section 51 while a tubular member 52 is secured to the lower end 50a. A plurality of orifices 21a, 21c are made through the wall section 53 of said member 52 while a regulating chip 28 having holes 30, 31 communicatable with any one of said orifices 21a, 21c is contained rotatably in said member 52.

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.

Conventionally, in order to improve the ride comfort or running stability of automobiles, etc., rotary drive devices such as motors built into piston rods have been used to respond to the driving conditions of automobiles, etc. A variable damping force type hydraulic shock absorber is said to be capable of adjusting the damping force as desired by rotating it by a predetermined angle and controlling the full rotation of the damping force adjustment adjuster using this rotational force. .

FIG. 1 shows the structure of such a conventional hydraulic shock absorber.

First, regarding this theory 8Aj, / is a cylinder 1.2il''j filled with hydraulic fluid; an outer cylinder that surrounds the entire outer periphery of the cylinder / to form a hydraulic fluid storage chamber 3 therein; / The interior communicates with the reservoir chamber 8 at its bottom (not shown).

VC is a cylindrical piston rod that sealingly penetrates and protrudes through a guide member S provided at one end of the cylinder. Adjuster, 2/Rotary shaft for full 1G rotation drive, 2
A rotary drive device 2B having zcLfc, the rotary drive device,
A rotational angle position detector for detecting the rotational angular position of the rotating shaft 2zα of 2J, a rotational drive device, and a drive unit for 2J from an external power supply section... - Ness 47.2 (i7
Electrical component tags such as power supply side connectors 4/, 3, etc. for supplying power via the power source are housed. In addition, B is slidably inserted into the cylinder/, and the inside of the cylinder is
Upper and lower liquid chambers7. A piston that is separated from each other, and the piston A has a through hole that communicates the upper and lower surfaces. , 10 sog
The upper and lower liquid chambers 71. ? Plate valve that confines the entire flow resistance to the flowing hydraulic fluid with open sound displacement //, /,
damping force generating means consisting of 2/, 3. /G is provided.

On the other hand, 75 is a stud which is formed into a cylindrical shape as a whole, and has a shaft hole / which communicates with the lower liquid chamber g attached with metal at one end, and the upper end of this stud / j is connected to the piston rod hole. This cylindrical F! is formed at the end of the F! It is fixed to the piston rod q by a nut member/ring screwed onto the outer periphery of A/7, and the lower end part/3b is completely solidly attached to the piston by a nut/9. The piston rod and the piston 2 are integrally connected. In addition, in the cylindrical wall portion 20 of the stud 15, as shown in FIGS. 2A and 2B, a plurality of orifices 2 are arranged at approximately equal intervals in the circumferential direction and have mutually different opening diameters. /a to 2/d...
and -vO to 22d... are provided in upper and lower two rows with a predetermined interval in the axial direction. These orifices 2
/α to 2/d...and 2.2α to 2.2
d... is provided in the cylindrical portion 2 of the piston rod so as to communicate with the annular groove 3 provided on the outer periphery of the cylindrical wall portion 20 and the annular groove 23. The upper liquid chamber ? V? It goes through a series. tsutp,
The cylindrical wall portion 20 provided with these eleventh fittings 2/α to 2/d and 3α to 2.2d is inserted into the inside of the cylindrical portion/7 of the piston rod dog, so that it is bent.

In the cylindrical wall part of the stud /S (C), there is an adjuster 2I which is rotatably driven by a motor 7 which cooperates with the reduction gear part 2S and constitutes a rotary drive device ZJ. This adjuster is movably housed in the lower si.
An axial hole U opening toward the chamber 7 and the axial hole J7
and the orifice of said stud/S, 2/α to 2/
Upper and lower communication holes 30.d and 2.2α to 22d can be selectively connected to each other.
3/ is being formed. Note that the VC between this adjuster 2g and the stand/5 is a coil spring 3.2.
is arranged, and the 51-direction separator, 2g is connected to the sealing member 3. ? It is biased towards the side.

A cylindrical member 3q formed in a cylindrical shape with both ends open is inserted and fixed inside the axial hole 29 of the adjuster 2g, and the cylindrical wall 3qα of the cylindrical member is fixed to the axial hole 29 of the adjuster 2g. Among the communicating holes 301.3/ provided on the side, the lower communicating hole 3/
It is inserted in a position that covers only the entire area. The cylinder wall 3g α
, the lower communicating hole 3 of the communicating holes 30° and 3/
A through hole that communicates only with 1? j is provided. Also, this cylindrical member? A check valve 3 consisting of a check spring 3t and a check plate 37 is provided at the open end of one part of the door, and under normal conditions, the open end is closed and the orifice 2/α is No, 2/d
and the upper and lower liquid chambers 7 through the communication hole and 2g. The flow of the flowing hydraulic fluid' (ll- is blocked).

Note that 1.39 is a stop member provided on the outer periphery of the piston rod dog, and this stop member 3q is connected to the guide member J.
It comes into contact with the lower end surface to stop the upward movement of the hinge loader, and the lever 0 is located between the adjuster 2 and the sealing member 33 and prevents the adjuster from rotating by 2g. It is a lubricating plate that makes the process smooth.

The hydraulic shock absorber having such a structure operates as follows. That is, the damping force generating means provided on the piston 2 is caused by the vertical movement of the piston rod accompanying the piston a2.
A damping force is obtained by displacing and flowing the working fluid between the upper and lower fluid chambers 71g through the /. At the same time, based on a control signal from a controller (not shown), the rotary saw 112 + the motor 2 and reduction gear part of the device J4, the regulator via the 2s metal,
2g is rotated to a predetermined pitch, and a communication hole Jθ is provided in this adjuster and 2g.

3/ and stud/JVc each have a plurality of orifices provided in the circumferential direction, 2/α to 2/c, and an orifice having a desired opening diameter from 22a to 2c, 2/
α to 2/c and 22α to 2.2. , communicate with.

From this AK, the upper and lower valley liquid chambers 7. A part of the flowing hydraulic fluid is transferred to the regulator, the communication hole 2.1', 30. ．． Orifice 2/a or 2 matched with 3/
/c and 2.2α to 2. t,' to obtain the desired damping force. That is, adjuster 2gf
Orifices, 2/α to 2/6 and 22a to 22c, which are rotated by a predetermined angle and allow the working fluid to pass through by-pass.
A desired attenuation cuff can be obtained by appropriately selecting the opening diameters of .

j So, now the piston rod is piston 6.
When the liquid moves upward with the liquid, the pressure in the upper chamber #71''l becomes high, and the pressure in the lower liquid chamber g becomes lower than that. Therefore,
The check grating 37 is moved downward by the spring force of the check spring 3z to close the upper end opening of the cylindrical member 3g. Therefore, a portion of the working fluid in the upper liquid chamber 7179 flows from the communication hole βq of the piston rod dog to the orifice, 2/α to The oil hole formed in the cylindrical member, 3S, passes through all 3.5 through holes of the cylindrical member and has a relatively small flow rate.
, s, and flows into the lower liquid chamber g.

On the other hand, when the piston rod moves downward, the pressure in the lower liquid chamber 2 becomes high, and the pressure in the upper liquid chamber 7 becomes lower than that. Therefore, the check plate? 7 rises against the spring force of check spring 3z and becomes a cylindrical member. For Yunouei Open O-kura 1. Therefore, a part of the hydraulic fluid in the lower liquid chamber is contained in the oil hole ys of the cylindrical member 3g, through hole 3s,
Communication hole GO, orifice, 2/α to x/ck sequential passage, and axial hole, oil hole 9j of cylindrical member 3q in 27, communication hole, 3/, orifice, 22α to 122
The liquid flows into the upper liquid chamber 7 through all two paths of the passage ck and further through four communication holes. Therefore, since the Himeji area increases compared to when the piston rod moves upward, a lower damping force can be obtained compared to when the piston rod moves upward.

By the way, in a hydraulic shock absorber with such a configuration, x
Ty I'/,! 2.2. ,and,
Adjuster, communication hole formed in 2g, ? , o, and 37 to adjust the desired damping force, each orifice has an opening area of n formed by
, 2/c and 22α to 2.20, the orifice 2/α, 2.2α, which has the maximum opening diameter, and the communication hole of the grommet 2g, 30. ．．
The relative position with 3/ must be accurately adjusted.

Therefore, conventionally, in which part of the adjuster 2 corresponds to the shaft hole /l of the stud /♂, the engagement notch +! 2, at the end of the stud/S near the F heavy liquid chamber, leave the entire engagement opening 77 open, and form the engagement notch 4J and the engagement recess 7.
The VC is set accurately by visually checking the relative positional relationship with the above-mentioned VC, or by using a special rod-shaped jig that engages the engagement notch 2 and the engagement recess q7. The relative positions of the orifice 2/a, 2.2a and the communicating hole 3o of the adjuster 2 can be accurately aligned.

However, with this positioning method, if the relative positioning of the orifice, 2/α, , 2.2α, which serves as the reference for positioning, and the communicating hole of the adjuster, 2g, 30 is completed, the visual inspection will not be possible. Not only is the alignment work complicated, but the accuracy of relative alignment is lacking, and on the other hand,
When using a special rod-shaped jig, first attach the adjuster, the 2g side and the stud 15IjllIvC engagement notch to the engagement recess 4.
Z7'i must be formed in advance, which has the drawback that the processing cost is high.

The present invention has been made in view of these conventional drawbacks.
FC type, the entire piston rod is divided into two parts, the main piston rod and the sub-piston rod, and the lower end of the main piston rod has a stud-driven piston fixed therein, while the inner part of the sub-piston rod has a cylindrical part. In addition to housing all the electrical components such as the rotational drive device and rotational angle position detector, the lower end of the sub-piston rod is
Before solidifying the cylindrical member that accommodates the adjuster and inserting and fixing the sub-piston rod into the cylindrical part of the main piston rod, the positions of the eleventh holes formed in the cylindrical member are determined. VC is used to easily and accurately align the relative positions of the orifice, which serves as a reference for alignment, and the friend through hole formed in the adjuster.

Hereinafter, one embodiment of the present invention will be described based on all the drawings. Components that are the same as those in Conventional Example 1 are designated by the same reference numerals, and redundant explanation thereof will be omitted.

$3 (The figure is a vertical cross-sectional view of an embodiment of the hydraulic shock absorber according to the present invention, and FIG. 4 is a vertical cross-sectional view showing the state before the sub-piston is fixed in the cylindrical part of the main piston rod. It is a diagram.

In FIGS. 3 and 4, a cylindrical main piston rod extends sealingly through one end of the cylinder/α, and the lower end of the main piston rod <tg
In α(, a cylindrical stud /S having 6 pistons integrally scrapes the rice grain layer, and a communication hole 247 communicating with the upper liquid chamber 7 is bored in the knotted part q9. 2. SO is a sub-piston rod detachably housed in the cylindrical portion 97 of the main piston rod 4t,
In the cylindrical portion jl of this sub-piston rod SO, electrical components such as a rotational drive device 2A1, a rotational angle position detector 4t/and a side connector 3 are housed.
Moreover, the cylindrical member J2 is integrally solidified at the lower end portion jOα. The cylindrical wall portion S3 in the cylindrical portion 97 has a circular hole with different opening diameters so as to communicate with the upper liquid chamber 7 through the communication hole KO of the main piston rod t♂. Pieces 11th 2/α to J/,
And 2.2a to 22C are drilled. In addition, this cylindrical member 5.20 inside the cylindrical wall S3 is a regulator having communication holes 30, 3/f that can communicate with any of the orifices 2/α..., 22α..., 21? are rotatably housed.

In addition, j is the outer circumferential surface of the sub-piston rod SO,! ;o
(b) is an annular sealing member that seals the sub-piston rod, tO, and the main piston rod g in a fluid-tight manner, and JS is the main piston rod +! This is a male threaded portion that is screwed together with a threaded portion St carved in one end of the inner cylindrical portion 9.

According to the mEE shock absorber having such a configuration, the sub-piston rod, 5
Prior to inserting and fixing 0, the cylindrical members j,, ll
Among the inclined orifices 2/σ・ and 22α... that formed IC shadows, ?l serves as a reference for positioning.
For example, the orifice 210 with the maximum opening diameter. λ) α and a regulator; 2. ! ? The relative positioning of the communicating holes 3o, 3i formed in the holes 3o, 3i can be easily and accurately performed while directly checking with the naked eye. ．．
3/ and 1J) r constant orifice J/(z 1.22a and fully accurate VC position i!
Insert O gold and main piston rod 4+! At the female threaded part, 5', the male threaded part s, s of the sub-piston rod SO.
By screwing in the main piston rod and the sub piston rod, you can easily and quickly tighten them.

Moreover, according to this hydraulic shock absorber, since the sub-piston rod, SO, can be easily taken out from the cylindrical part 51197 of the main piston rod q, the electrical components in the sub-piston rod SO can be removed as needed. All items such as blowfish can be easily replaced.

In addition, in this example, a hydraulic shock absorber having a structure in which a check valve 3♂ is incorporated in the adjuster -2g circle is explained, but a hydraulic shock absorber having a structure in which such a check valve 3g is not incorporated is explained. The present invention can also be applied to

As is clear from the above description, the present invention has a cylindrical main piston rod in which a cylindrical stud with a piston is solidly solidified, and a cylindrical member in which an A-shaft is housed in a circular portion is solidly solidified. Since the structure is divided into two sub-piston rods, one of the plurality of orifices formed in the cylindrical member is a predetermined orifice that serves as a reference for alignment, and a communication hole formed in the adjuster. The relative position of the metal can be easily and accurately confirmed by directly checking with the naked eye. Further, according to the present invention, since the entire sub-piston rod can be easily taken out from inside the cylindrical portion of the main piston rod, if the electrical components etc. inside the sub-piston rod break down, the electrical components can be removed as needed. etc. can be easily replaced.

[Brief explanation of the drawing]

Figure 1 is a partially omitted vertical cross-sectional view of a conventional hydraulic shock absorber, @
Figure 2 (A) is an x-Hp sectional view in Figure 1, and Figure 2 (
H) is a sectional view taken along line ff1-11 in FIG. 1, FIG. 3 is a partially omitted vertical sectional view showing the hydraulic shock absorber according to the present invention, and FIG.
The figure is a partially omitted vertical sectional view showing the state before the sub-piston rod is inserted into the main piston rod circle. /...Cylinder, /a...-9W, t...Piston, 7...Upper liquid chamber, ♂...Lower liquid chamber, /3. /l
l...damping force generating means, /dirt...stud, /2...
・Shaft hole, ノ/α~, 2/, , , 2Jα~, 22C・
...Orifice, 2q...Communication hole 1.2A...Rotary drive device 1.2Jα...IO1 rotation axis, 2g...Adjustor 1.29...Axial hole, 30,3/...・Communication hole, da/...rotation angle position detector, q da...electrical parts, groove...main piston rod, g9...m shape m
, s o... Sub-piston rod 1.30a... Lower end part, j/... Cylindrical part, 3.2... Cylindrical member, 33.
...Cylinder wall.

Claims (1)

[Claims] (1) A cylinder completely filled with hydraulic fluid, a cylindrical main piston rod extending sealingly through one end of the cylinder, and a VC inserted into the cylinder so as to be slidable inside the cylinder. A piston is separated into two parts, an upper liquid chamber and a lower liquid chamber, and is equipped with a damping force generating means that allows a limited displacement flow of working fluid between these two chambers, -yI
A cylindrical stud that integrally connects the main piston rod and the piston and has a shaft hole communicating with the lower liquid chamber; a sub-piston rod; a solid layer is provided at the end of the sub-piston rod; one end has an axial hole that communicates with the lower liquid chamber; a cylindrical member having a plurality of orifices bored in the circumferential direction with mutually different opening diameters so as to communicate with the upper liquid chamber through a communication hole provided therein; an adjuster having a communication hole capable of communicating with any one of the plurality of orifices; and a rotating shaft that is housed in the cylindrical portion of the sub-piston rod and drives the adjuster in full rotation. A rotary drive device and electrical components such as a rotation angle position detector for detecting the rotational position of the rotation shaft of the rotary drive device are all included, and a sub piston rod marked vCN is inserted into the cylindrical portion of the main piston rod, and these A hydraulic shock absorber characterized in that a main piston rod and a sub-piston rod can be fixed in a state in which they are completely accurately aligned with a shaft.