JPH089471Y2 - Suspension fluid piping structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fluid piping structure of a suspension, and in particular, the fluid pressure of the fluid in the lower chamber of the shock absorber is passed through a supply / discharge pipe connected to the upper end of the piston rod. The present invention relates to a fluid piping structure of a so-called active suspension that controls the displacement of a vehicle body.

[Conventional technology]

A fluid introduction part is formed in the piston rod of the shock absorber supported by the vehicle body via a mount rubber, and a supply / discharge pipe equipped with a fluid control valve is connected to the upper end of the piston rod to introduce the fluid of the piston rod. As a fluid piping structure of a suspension that controls the height or posture of a vehicle by supplying and discharging fluid pressure to and from a part, for example, a service manual “Mechanic 2 Citroen BX” issued by Citroen in France in March 1983. ".

[Problems to be solved by the device]

However, this conventional example has a structure in which the fluid supply and discharge pipes are connected through a joint screwed to the upper end of the piston rod, and therefore, when connecting the joint to the piston rod, the fluid is connected to the periphery of the upper end of the piston rod. , It was necessary to provide a wide space for rotating the joint and the other members so as not to disturb other members. Therefore, in the conventional example, the piston rod is extended above the mount rubber and the joint is provided at the extended end.

Therefore, in such a conventional example, since the fluid piping structure occupies a considerable height than the mount rubber that supports the piston rod on the vehicle body, the amount of protrusion upward from the vehicle body increases, If this is used for the front suspension, there is a problem that it will interfere with other equipment such as the engine room and the hood.

Therefore, the present invention has been made in view of such a problem of the conventional technique, and a fluid supply / discharge pipe is provided at the upper end of the piston rod while minimizing the amount of protrusion upward from the vehicle body. It is intended to allow easy connection.

[Means for solving the problem]

The fluid piping structure of the suspension of this invention forms an axial flow path in the piston rod of the shock absorber supported on the vehicle body through the mount rubber, and
In the suspension fluid piping structure in which a supply / discharge pipe equipped with a fluid control valve is connected to the upper end of the piston rod to control the hydraulic pressure in the lower chamber of the shock absorber via the flow path of the piston rod, The inner side is supported by an inner cylinder having an inner diameter larger than the outer diameter of the piston rod and supported by the piston rod to form a space between the inner cylinder and the outer circumference of the piston rod, and at the tip of the piston rod. The lower end of the cylindrical adapter is coaxially fixed in the space, and the supply / discharge pipe is connected to the upper end of the cylindrical adapter via a joint. Further, a protective film having high liquid resistance is laid between the member on the vehicle body side and the annular metal fitting fixed to the upper end of the inner cylinder, and the protective film covers the upper side of the mount rubber and the annular metal fitting. In addition, a void is formed that communicates with the inside of the inner cylinder from the space between the protective film and the upper surface of the mount rubber.

[Action]

Using the space formed between the inner cylinder of the mount rubber and the outer circumference of the piston rod, the lower end of the cylindrical adapter is fixed to the tip of the piston rod. Since this adapter is cylindrical, it does not require a large space around it even if the fixing means is screwed, and after mounting the mount rubber on the vehicle body and mounting the shock absorber on the vehicle body, the adapter is installed from the upper side of the vehicle body. Can be installed. Next, a joint is attached to the upper end of the tubular adapter from the upper side of the vehicle body, and the supply / discharge pipe is connected to the joint.

The liquid is supplied to the flow path of the piston rod through the supply / discharge pipe, the joint, and the tubular adapter, and is also discharged by flowing backward. Even if the liquid flows down from the joint toward the mount rubber, the upper side of the mount rubber is covered with the protective film, so that the liquid does not adhere to the mount rubber and therefore the deterioration of the mount rubber due to the liquid is prevented. be able to. Further, when the mount rubber is elastically deformed to absorb the vertical vibration transmitted from the wheel side, the volume of the space between the upper surface of the mount rubber and the protective film changes, and the air pressure thereof tends to change. , Since this space communicates with the space inside the inner cylinder through the gap of the annular metal fitting, and air flows in and out, it is possible to absorb the air pressure change due to the volume change and prevent the protective film from excessively expanding and contracting. Therefore, the deterioration of the protective film can be suppressed.

〔Example〕

In the figure, 1 is a shock absorber, and a tube 2
It comprises a piston (not shown) therein and a piston rod 3 having the piston fixed to the lower end. An axial flow path 4 is opened in the piston rod 3, and the flow path 4
Communicates the inside of the tube 2 with a lower chamber that is vertically partitioned by a piston. A lower metal fitting 5 and a holder 7 of a dust boot 6 are externally mounted on a step portion formed on the outer periphery of the upper portion of the piston rod 3, and a cover 9 of a bumper bar 8 is attached to the lower side of the holder 7. ing.

An inner cylinder 12 to which the inner surface of the inner mount rubber 11 is vulcanized and adhered is fixed to the upper surface of the lower metal member 5 with a space from the outer circumference of the piston rod 3 and extends from the inner mount rubber 11.
The a extends to the outer periphery of the lower fitting 5. The inner mount rubber 11 is connected to the outer mount rubber 13 via a middle cylinder 14, and an outer cylinder 15 is bonded to the outer periphery of the outer mount rubber 13. An upper spring seat 16 is formed on the upper portion of the outer cylinder 15, and a coil spring 18 is contracted between the upper spring seat 16 and a lower spring seat 17 fixed to the outer circumference of the tube 2.

The upper portion of the middle cylinder 14 is expanded in the lateral direction and fixed to the upper fitting 19 on the upper surface thereof, and these are fixed to the vehicle body 22 by the bolts 21. An outer mount rubber is provided on the lower surface of the upper part of the middle cylinder 14.
The extended portion 13a of 13 extends to the outer periphery and is adhered to face the upper surface of the upper spring seat 16, and both 13a and 16 form a bound stopper. Further, the lower end of the middle cylinder 14 and the extension portion 11a of the inner mount rubber 11 face each other to form a bound stopper here.

A buffer rubber 23 having high oil resistance is adhered to the inside of the upper surface of the upper fitting 19, and a protective film 24 made of the same material is arranged continuously from the inner peripheral end to the upper end of the inner cylinder 12. .
An annular metal fitting 25 is adhered to the lower end of the protective film 24, and the membrane 24 is attached by fitting the annular metal fitting 25 into the inner cylinder 12. The annular metal fitting 25 is formed with irregularities in a part in the circumferential direction, thereby forming a space 26 communicating with the inner cylinder 12 between the inside and the outside of the protective film 24.

At the upper end of the piston rod 3, a cylindrical adapter 28 is screwed from the outside between the lower end surface of the piston rod 3 and the upper surface of the lower metal fitting 5 via a spring washer 27, and the step portion of the piston rod 3 and the spring washer 27 are connected. The lower metal fitting 5 and the holder 7 are fixed between the two. Flange part of the tubular adapter 28
The upper outer periphery of 28a has a square cross section so that a wrench can be engaged. This is the wrench engaging portion 28c. The tubular adapter 28 is screwed into the space utilizing the space between the piston rod 3 and the inner cylinder 12, and the space is still left outside.

A supply / discharge pipe 29 having a fluid control valve (not shown) is connected to the upper end of the cylindrical adapter 28 via a joint 31. In this embodiment, the liquid is supplied and discharged through the supply / discharge pipe 29, and the joint 31 includes the connection hole 32 of the supply / discharge pipe 29, the connection hole 34 of the air bleeder 33, and the lower tubular portion 35. The lower cylindrical portion 35 is fitted to the outer periphery of the upper end of the cylindrical adapter 28, and the eyebolt 36 is penetrated from above and screwed into the inner periphery of the upper end of the cylindrical adapter 28 so that the cylindrical adapter 28 Fixed.
The inner space of the eyebolt 36 communicates with the connection hole 32 and the connection hole 34 of the joint 31, respectively, but the through hole 36a communicating with the connection hole 32 to which the supply / discharge pipe 29 is connected is connected with the air bleeder 33. It is below the through hole 36b communicating with the connecting hole 34. Thus, the supply / discharge pipe 29 communicates with the flow path 4 inside the piston rod 3 via the joint 31 and the tubular adapter 28, and further communicates with the lower piston chamber within the tube 2 of the shock absorber 1. When the eyebolt 36 is tightened, the joint 31 and the tubular adapter 28 are sealed by the copper washer seal 43. By adjusting the hydraulic pressure in the piston lower chamber, the height and posture of the vehicle body are controlled in accordance with the running conditions.

In the middle of the tubular adapter 28, a tubular portion 37 and a dish-shaped portion 38 that continuously extends from the upper end of the tubular adapter 28 and extends to the upper side of the buffer rubber 23
A rebound stopper 39 consisting of is fixed at the lower end of the tubular portion 37. The lower end of the tubular portion 37 has a tubular adapter 28.
The flange portion 28a of the tubular adapter 28 receives the input to the rebound stopper 39 when it is fixed on the lower side of the flange portion 28a of the cylindrical adapter 28 and abuts against the upper fitting 19 via the buffer rubber 23.
I am going to receive it. Such rebound stopper 39
Is also below the joint 31, and also serves as a liquid receiver for receiving the flow-down of the residual liquid leaking from the joint 31 and its periphery at the time of maintenance and inspection.

Further, on the outer periphery of the cylindrical adapter 28, the flange portion 28
In a, several grooves 28b are formed in the circumferential direction, and the inside of the cylindrical portion 37 of the rebound stopper 39 and the inner space of the inner cylinder 12 communicate with each other through the grooves 28b. In addition, this space is a communication hole formed in the lower fitting 5 and the cover 9.
5a communicates with the inside of the dust boot 6, and the inside of the dust boot 6 communicates with the outside through a communication hole 41a of a fixing member 41 for fixing the lower end of the dust boot 6 to the tube 2. The inside of the rebound stopper 39, the groove 28b, and the inner cylinder 1
The internal space of 2, the communication hole 5a of the lower metal fitting 5, the interior of the dust boot 6 and the communication hole 41a of the fixing metal fitting 41 form a discharge passage for the liquid flowing down into the rebound stopper 39.

Further, a cap 42 is placed on the upper surface of the joint 31 so as to cover the distal end portion of the supply / discharge pipe 29 and the air bleeder 33, and a dust boot 44 is formed between the outer peripheral portion and the vehicle body 22.

 Next, the operation of this embodiment will be described.

The shock absorber 1 is sub-assembled with each member below the upper metal fitting 19 to which a cushioning rubber 23 is adhered, except the spring washer 27 and the tubular adapter 28. Then, the bolt 21 is passed through the vehicle body 22 and a nut (not shown) is screwed into the bolt 21 to fix the bolt 21 to the vehicle body 22. In this state, the upper end of the piston rod 3 is exposed in the space inside the inner cylinder 12 so as to project from the center of the lower fitting 5.

Next, the spring washer 27 is dropped from the upper end to the outer periphery of the piston rod 3, and then the tubular adapter 28 to which the rebound stopper 39 is fixed in advance is screwed onto the outer periphery of the upper end of the piston rod 3. This screwing is performed by engaging the wrench with the wrench engaging portion 28c of the tubular adapter 28 from above, and then the joint 31 is arranged on the upper end of the tubular adapter 28. The joint 31 is arranged by fitting the lower tubular portion 35 to the outer periphery of the upper end of the tubular adapter 28. In this state, pass the eyebolt 36 through the joint 31 from above,
The joint 31 is fixed to the tubular adapter 28 by screwing the lower end thereof to the inner circumference of the upper end of the tubular adapter 28. After that, the air bleeder 33 and the supply / discharge pipe 29 are attached to the joint 31, but one or both of them may be attached to the joint 31 in advance. Here, since it is tightened in the vertical direction by the eyebolt 36, the copper washer seal 43 can be used, and there is an advantage that the reliability of the seal is high.

Then, finally, the cap 42 is put on and the lower end of the dust boot 43 is attached to the vehicle body 22. The dust boots 44 can be attached to the vehicle body 22 by a known attachment means such as engagement by unevenness or fixing by a band, which is not shown. It is preferable that the cap 42 has a slit (not shown) at a portion covering the supply / discharge pipe 29 so that the cap 42 can be attached to / detached from the supply / discharge pipe 29 connected to the joint 31.

Here, of the vertical force transmitted from the wheel side, the force transmitted from the piston rod 3 is transmitted to the inner mount rubber 11 via the lower metal fitting 5 and the inner cylinder 12, and is absorbed by the shear deformation. It At this time, even if there is a change in the volume of the space between the upper surface of the inner mount rubber 11 and the protective film 24, the air inside goes in and out through the space 26. Further, the force transmitted from the coil spring 18 is transmitted to the outer mount rubber 13 and is absorbed by the shear deformation.

If the input at the time of bouncing is excessive, the lower end of the middle cylinder 14 and the lower metal fitting 5 collide with each other via the extension 11a of the inner mount rubber 11 and excessively displace when the input from the piston rod 3 is made. In addition, when the excessive input is input from the bumper bar 8, the upper spring seal 16 and the upper expanded portion of the middle cylinder 14 come into contact with each other via the extension portion 13a of the outer mount rubber 13 to cause excessive displacement. To prevent.

On the other hand, when there is an excessive displacement in the rebound direction,
The dish-shaped portion 38 of the rebound stopper 39 abuts the upper fitting 19 via the cushioning rubber 23 to prevent this excessive displacement.

It should be noted that the piston rod 3 with respect to the vehicle body 22 during the displacement
By moving up and down, an angle change occurs between the tubular adapter 28 and the joint 31, and even if a twisting force is generated between them, the joint 31 for the tubular adapter 28 by the eyebolt 36.
The fixing force of the above and the lower tubular portion 35 fitted on the tubular adapter 28 can sufficiently support the force of the twist.

Further, when the joint 31 is removed from the tubular adapter 28 for inspection and maintenance, etc., when the liquid remaining inside the supply / discharge pipe 29, the joint 31, etc. flows down, the liquid is received by the dish-shaped portion 38. Guided by the tubular part 37,
28 through the groove 28b on the outer circumference, flow down into the inner space of the inner cylinder 12, and further guided into the dust boot 6 through a communication hole 5a opened in the lower metal fitting 5 and the cover 9; It flows down to the outside through the communication hole 41a of 41.
Therefore, the liquid does not adhere to the inner mount rubber 11 and the outer mount rubber 13 to deteriorate them. Even if the liquid should overflow from the outer periphery of the dish-shaped portion 38, since the buffer rubber 23 and the protective film 24 are made of a material having high oil resistance, they are hardly deteriorated, The membrane 24 also allows the liquid to move inside the mount rubber 11
It is also prevented from adhering to the upper surface.

[Effect of device]

As described above, in the present invention, since the space formed between the inner cylinder of the mount rubber and the outer circumference of the piston rod can be utilized, the supply / discharge pipe is provided at the tip of the piston rod through the cylindrical adapter. The joints of can be connected. Therefore, it is possible to easily connect the fluid supply / discharge pipe to the upper end of the piston rod while minimizing the amount of upward projection from the vehicle body. Also, even if the liquid flows down from the joint between the joint and the supply / discharge pipe toward the mount rubber, the upper side of the mount rubber is covered with the protective film, so the liquid does not adhere to the mount rubber, Therefore, deterioration of the mount rubber due to the liquid can be prevented. Also, when the mount rubber is elastically deformed by the vertical vibration transmitted from the wheel side, the volume of the space between the top surface of the mount rubber and the protective film changes and the internal air pressure tends to change. Since air communicates with the space inside the inner cylinder through the space of the metal fittings, and air flows in and out, it is possible to absorb changes in air pressure due to the volume change, and prevent excessive expansion and contraction of the protective film to protect the protection film. There is also an effect that the deterioration of the film can be suppressed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of the embodiment, and FIG. 2 is a plan view of the joint. 1 ... Shock absorber, 3 ... Piston rod, 4
...... Flow path, 5 ...... Lower metal fitting, 11 …… Inner mount rubber, 12 …… Inner cylinder, 13 …… Outer mount rubber, 14 …… Middle cylinder, 15 …… Outer cylinder, 18 …… Coil spring, 19 …… Upper metal fitting, 22 …… Car body, 28 …… Cylinder adapter, 29 …… Supply pipe, 31 …… Coupling, 32,34 …… Connection hole, 35 …… Lower cylinder, 3
6 …… Eyebolt

Claims (1)

[Scope of utility model registration request] 1. A shock absorber supported on a vehicle body via a mount rubber, wherein an axial flow path is formed in a piston rod, and a supply / discharge pipe having a fluid control valve is connected to an upper end of the piston rod. In the fluid piping structure of the suspension that controls the hydraulic pressure in the lower chamber of the shock absorber via the flow path of the piston rod, the inside of the mount rubber has an inner diameter larger than the outer diameter of the piston rod, and The space is formed between the inner cylinder supported by the supported inner cylinder and the outer circumference of the piston rod, and the lower end of the cylindrical adapter is fixed to the tip of the piston rod coaxially in the space. The supply / discharge pipe is connected to the upper end of the cylindrical adapter via a joint, and a protective film having high liquid resistance is provided between the member on the vehicle body side and the annular metal member fixed to the upper end of the inner cylinder. Spanned covers upper side of the mount rubber by the protective film, and the annular fitting,
A fluid piping structure for a suspension, characterized in that a space communicating between the space between the protective film and the upper surface of the mount rubber and inside the inner cylinder is formed.