JPS58166150A - Hydraulic buffer - Google Patents

Abstract

PURPOSE:To improve the working property for processing and assembling, and shorten the basic length of an operating rod by constituting a piston rod from two fitting members and providing a shutter as a valve body at the fitting position of the fitting members. CONSTITUTION:A piston rod 3 is constituted by two fitting members 4 and 5. A chamber C is formed at the fitting position of these members 4 and 5. Two oil passages 13 and 15 are formed between the chamber C and two cylinder chambers A and B. A shutter 17 which carries out the throttling adjustment between two oil passages, is provided in the chamber C. An operating rod 18 which can operate the shutter 17 from the outside is inserted through the piston rod 3.

Description

[Detailed Description of the Invention] This invention relates to a hydraulic shock absorber with adjustable damping force.In recent years, there has been a tendency for hydraulic shock absorbers with adjustable damping force to be adopted as shock absorbers in automobiles, for example. be. This is because by varying the damping force characteristics according to the road surface conditions on which the vehicle is traveling, it is possible to improve the ride comfort of the vehicle. For example, when driving on a highway, the damping force is small.On the other hand, when driving on a rough road, the damping force is large.Ride comfort can be improved by increasing the damping force.

Such a hydraulic shock absorber II is designed so that its damping force characteristics can be controlled from the outside as appropriate. A damping valve e is provided which communicates with one cylinder 11 to produce a predetermined damping force during the extension and retraction displacement of the piston rod, and a bent bypass passage through which one cylinder iitt-m passes through the piston rod, and this bypass passage is provided. The passageway is equipped with a valve body for adjusting the throttle and a working rod that allows the valve body to be operated from the outside. Then, by operating the valve body with the working rod, 1
It is possible to adjust the damping force when the piston 4 is extended and when the piston is in the excessive Iff position.

By the way, conventionally, since the piston rod is made of a single piece, the machining work to form the curved bypass passage is extremely troublesome.

In addition, for the purpose of ensuring sufficient space for the installation of the valve body, the piston is fixed to the piston rod.
Fukuronatsu and this Fukuronatsu's hollow old island 1Ill
For those used as spaces for displaying discs,
Aligning the position of the piston rod and the cap nut [This must be done accurately, which makes assembly extremely troublesome, and the cap nut side, which is located at the end of the piston rod, is the main length. Since a retracting rod is required, there is a problem in that the basic length of the retracting rod itself becomes long.

! However, in the past, there was a problem that the flowing oil generated noise in the bypass passage.This invention was made in view of the above circumstances, 1) By incorporating the above-mentioned shutter as the valve body in the fitting & N position, the above-mentioned conventional gap is eliminated, and the workability of machining and assembly is improved. The basic length of the operating rod can be rt1m<r, and the sound generated by flowing oil can be suppressed in the oil passage. The purpose of the stopper receiver is to provide a hydraulic shock absorber that can reduce random firing and ensure sufficient space for the check valve attached to the piston rod.

Hereinafter, F1 Embodiment of this invention will be explained based on the drawings.

- @/II and S1 Figures show the II/II embodiment, and the inside of the cylinder 10 is one cylinder chamber Ae B&: 111E, and the piston rod 8 is connected to this piston S&:. The piston rod 8 consists of one vertical joint, a, with a joint number of II/, passing through the piston S and connected by a nut 6 to the piston S&. II J II) 'Fllll island of fitted body 6 is @
/ is screwed into the upper diameter a of the fitting body 4, and I
I/I/fitting body 4IIIl hole? By crushing the six male thread islands of the first fitting body by the mince passing through the tube, the I
The O piston 3, which is strongly connected to the fitting body 4 of Il, is provided with two oil passages 8 and 9 that communicate the cylinder chambers A and B of the upper F, and is equipped with a normally closed F-side damping valve 10 that opens 8 ft of oil passages by the negative pressure in the F cylinder 10, and above the piston 2, the F side damping valve 10 opens by the negative pressure in the upper cylinder 10. The normally closed upper damping valve 11 that opens the other oil passage 9rr is installed. The damping valve 10 has a piston 20F.
It is held between the @drink and the restraining member 1B. On the other hand, the upper damping valve LL is connected to the upper mb of the piston 2 and the first damping valve LL.
It is held between the outside step 4a of the fitting body 4.

Therefore, the outer step part 6m of the mating and stopping part of the assembly 1 functions as a suppressor for the F-side damping valve IO, making the suppressing member unnecessary and reducing the number of parts accordingly. [Achieved.

A concave portion is provided on the F end face of the above-mentioned m-coated fitting body 6, and this allows the fitting portion of the island/, @co-fitting body 4.6 to be
:MC is formed. This chamber C is communicated with the cylinder part B on the F side by an oil passage 1B of II/ passing through the center of the bush combination number of @l.

′! ! In addition, an annular groove is provided on the outer circumferential surface of the lower end side of the first fitted bodies. is formed 8. This annular group Ds communicates with the loose body of the wire through one hole L4 provided along its radial direction. Note that these holes No. 1 are provided at positions lined up along the longitudinal direction of the piston rod 8 at II/upper F in the figure. Also, the sll-shaped chamber is connected to the upper cylinder depth A, so that the six holes 14.16 are connected to the upper cylinder depth A. A series of easy-to-handle oil passages T are formed in the upper cylinder depth A, and the annular 1iI is formed in the oil passage 18 of this IIJ.
ID is mediated. By the way, the holes 14 and 16 are
As shown in Figure 1, the phases of their formation locations are shifted 8 so that they do not face each other.

A shutter 17 having an arcuate cross section is rotatably housed in the shaft C, and an F end of an operating rod 18 is connected to the shutter 17.

The upper end of the operating rod L8 passes through the center of the piston rod 8 and extends to the outside of the cylinder l.

Further, an outer cylinder 88 is fitted on the outside of the cylinder 1, and the upper and lower ends of both cylinders t and aS are closed, respectively, with upper and lower cap bodies 89, 40 &: Between these two cylinders L and 88 &:l
The cap body 40 on the OF side in which the I-shaped space is formed is provided with a small aperture hole 4L that communicates with the annular space and the 'F' cylinder gB. ! A mounting ring 4s is provided on the outside of the frame. Upper cap body 8
9 includes a front guide 4B, a spring 44, a washer 46, and a seal material 46.

Then, oil is sealed in the annular space and the cylinder depths A and B of the upper F, and a gas G is sealed above the annular space. The volume of oil that is displaced by the entry of the piston rod 8 into the cylinder IEA above this gas Gkls is absorbed.

However, according to the hydraulic pressure sensor that takes the oil pressure in this way, when the piston rod 8 moves to the left and right, the oil passage 8.9 [
The flow resistance of the oil passing therethrough creates a certain damping force for the movement of the piston rod 8.

By operating the operating rod 18, the shutter 17
Then, as shown in FIG. 1, the shutter 17 closes the hole 14 and the oil passage L6 (closed state), and the shutter L7 deviates from the hole 14 and the oil passage L6 of IIJ (open state) becomes one valve. The operating state is selected &:Il. In the former valve operation state, that is, when the oil passage 16 of IIJ is suddenly closed, the present shock absorber generates the predetermined damping force against the movement of the piston rod 8. On the other hand, the latter valve operation state! When the second oil passage 16 is in 1s condition, the oil passages 1B, ilC and 1 of the assembly 1!
- The oil passage I6 is a series of bypass oil passages. Therefore, at this time, the damping force generated by the present shock absorber decreases. By the way, when oil flows in the first oil passage 16, The intervening annular group has a muffling effect on oil flow noise.[Especially, since the annular group D&: and the holes 14 and 15 are formed out of phase, the muffling effect is not great ing. Further, the oil flowing out from the oil passage L8 of @/ into the cylinder sump B on the F side is guided to the linear first oil passage 18, thereby being rectified and its turbulent flow is avoided.

In addition, the Bisshin rod B is connected to the T island l, the fitted body 4,
6 are connected in advance so that the holes 14 and 16 are in a predetermined positional relationship, so that the shape of the first oil passage L6 is formed to be positive as specified. Therefore, by knowing the relative rotational positional relationship between the upper ends of the piston rod 8 and the operating rod 18, it is possible to reliably open and close the oil passage L6.

Diagram IIJ shows an example of this envy. According to this embodiment, the check valve 1g is provided in Plb of the MC. This check valve I9 has a valve body IAO and a spring St.
and the valve body zO closes the opening of the oil passage 1B of kl by a predetermined force from the spring S1. In the past, the interior of the chamber C was effectively used as a space for installing the check valve 19.

′! ! %* / *The first mating stop is located on the outer periphery of 10 mating islands! A rubber (buffer member) Ill is attached to the upper scrap end (fitting step) +b&: of the rigging suspension of /. In reality, this rubber sII is rounded in an annular shape, and is brought into contact with the fitting body 64JE of the receptacle, and is brought into contact with the upper circumferential end guard of the island l of the fitting weight. This rubber mm restricts the upward movement of the piston rod 8 by coming into contact with the rod guide 48 . By the way, in conventional shock absorbers, rubber s
A buffer member corresponding to fl#1 is attached to another stopper receiver 1 member fl# fixed to the outer periphery of the piston rod. Once upon a time, ml/f) vertical meeting suspension top @ scrap end criticism 4b
In this case, the stopper holder has a function as a random shot, and the stopper holder achieves a reduction in the number of parts.

III reference is 1871 of this invention! Example [Example ■. According to this embodiment, the recess provided in the first (1) fitting body 4Ii1 forms the wealth C at the scissor island position of the first fitting body 4Ii1, and the first fitting body 4Ii1 has a shape ML. In addition, 111 oil passages 16 are formed only by the holes 16 on the fitting body 4 side.
The middle portion of the fitted weight of the upper damping valve 11 is made smaller in diameter.
#1 holding member z8 is newly installed. Further, a check valve 84 is provided inside one of the oil passages IB of the assembly. This check valve s46 and l1kl's oil passage LB are connected to the upper working opening of the center hole of the T-nut 7,
The force of the spring B6 pushes the valve body 116t, and I! / Oil passage lB [It is designed to close with a predetermined force.

Therefore, according to this embodiment, the inside of the oil passage 1B of @l can be effectively used as a space for installing the check valve 84.
has been done.

No.! The figure shows a second embodiment of the present invention.
Ba-Il! Is the mating body 4 of / one 11111 adult body 1? .

z8, and the first fitting body 6 is fitted by the combination of one structure B9, 8G, and the VC of the assembled body is
The recess provided on the body 4 side allows for assembly.

One Sakaki IE body 1G of the fitted body 64iIl of the fitted body 41.6 in which the chamber C is formed
O-rings at and am are interposed between the hollow rod and 2n, between the structural bodies 119 and 80, and between the ma body 80 and the operating rod 18, respectively.

Further, the annular chamber has a relatively large shape wL, and a check valve 8I is provided inside the annular chamber. This check valve 88 is formed by pressing the valve body 8fl[- by the force of the spring 8b to the opening height of the hole 84 provided in the fitting body 4III of the new B4) It is designed to close with a predetermined force. Therefore, the interior of the annular fiD is effectively used as a space for installing the check valve 88.

It may also have a cylindrical shape or the like.

In addition, in each of the above embodiments, the age of 6 years, the age of turtle 1, and the first fitted body are 4.6 years old.
t- Screw them together, and connect them by screwing them together, and these connecting means are not limited to the above embodiments, and are arbitrary, for example. , etc. If the fixing pin is used to connect and connect, the hole 7 of the fitting body 4 of %@/ will of course be unnecessary.

1 In each of the above embodiments, the cylinder I and the outer cylinder 88
The annular space between the gas G and Of course, it is also applicable to a type of shock absorber formed with a.

As explained above, in the hydraulic shock absorber according to the present invention, the piston rod is formed by two fitting bodies, and the shutter as a valve body is provided at the fitting position. The basic length of the operating rod can be shortened, and the assembly workability is good.
The sound of flowing oil can be suppressed in the oil passage, and in addition, the damping valve material and the piston rod movement range can be reduced by reducing the stopper receiving material and the piston rod. Effects such as being able to secure sufficient space for the check valve attached to the jid.

[Brief explanation of drawings]

11/! l! 13 is an embodiment of the present invention [T longitudinal sectional view shown in FIG. The longitudinal section [Ti diagram, Island 6 diagram is a cross section along the M-v line in Figure 3 [K diagram, recited diagram is another example of the shutter] [Similar to Tm4 diagram]. 1...Cylinder, 8...Piston, 8
...Piston rod, 4.6...Fitting body, 4b...Left side peripheral end & (i combination), 13
...Sugar l oil path, 16...First oil path, 17...Shutter, L8...Operating rod, 19. ii4.8B・・・Check valve,
g2...Rubber (buffer material), A, H...
Cylinder wealth, C... wealth, D... ring shape. 211 Figure 3 IR Figure 6 Figure 7

Claims (1)

[Scope of Claims] A fitting body of 12 piston rods forms an oil passage 11 in the fitted position, and an oil passage II/ is formed between the cylinder body and the cylinder body of -1. , between said cave and the other cylinder genus IIIJO oil II [formed, and in said mold &:w
Collection 1. - The shutter for adjusting the diaphragm between the oil passages 1 and 1 is inserted into the bolt which allows the shutter to be operated from the outside.Characteristics and T
Hydraulic buffering -〇(2) A cyclic group is interposed in the oil passage of the coil, and the 11/
Claims mws in which the phase of the oil passage formation location is shifted
Hydraulic shock absorber for section t. (3) A fitting step iI6 is formed on the outer periphery of the screw rod consisting of the one fitting body, and the fitting step a&: is brought into contact with the lid guide of the piston lid to bring the piston lid to the movement limit position 1! Hydraulic equipment as described in Section 1 or Section 2 of Section 1 or Section 2 of Items 1 and 2 of Items 1 and 2 of Items 1 and 2 below. (4) A check valve interposed within the seal in a series of oil passages consisting of the oil passages of the coil 1 and the oil passage according to claim 1, 112, or 3. In the above 1
Claim 1, 1111, comprising a check valve interposed in a series of oil passages consisting of oil passages of 1/, lIJ.
Hydraulic shock absorber according to item or item IIJ.