JPS63170112A - Suspension unit - Google Patents

Abstract

PURPOSE:To promote the facilitation in a suspension unit for its car-mounting layout, by constituting the suspension unit of a means providing an oil supply and discharge port and a leakage oil collecting port in an outer cylinder in a car body side to be prevented from performing the relative displacement from a car body so that the necessity for using a flexible tube for piping is eliminated. CONSTITUTION:A cylinder tube 10 hermetically seals its upper end to a minor contour part 52 of an outer cylinder cap 50 through an O ring 54 while blocks the bottom end by a guide member 13 so that the cylinder tube 10 forms a pressure chamber 11 which slides in its inside a piston 20. While the outer cylinder cap 50 is secured through its major contour part 51 to the upper end of an outer cylinder 40, further the outer cylinder cap 50 provides in its central part an oil supply and discharge port 53. Further a leakage oil collecting port 60 is provided inside a connector 61 provided in the vicinity of the upper end of the outer cylinder 40, and further a leakage oil collecting chamber communicates with a leakage oil collecting path. While a suspension tube 70 is slidably supported to the outer cylinder 40 through each bearing 74, 75. And a suspension unit mounts the outer cylinder cap 50 to a car body side while a bracket 73 to an axle side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension unit, and particularly to a suspension unit as a vehicle height adjustment actuator for a hydropneumatic suspension.

(Prior Art) As a suspension unit used in a conventional hydropneumatic suspension, for example, one described in Japanese Utility Model Application Publication No. 60-81010 is known.

This conventional suspension unit includes a cylinder, a piston, a piston rod, and an outer cylinder.The upper end of the piston rod is attached to the vehicle body, and the oil from the hydropneumatic suspension can be supplied and discharged into the lower oil chamber of the cylinder. It was hollow throughout its entire length. Further, the outer cylinder is attached to the axle side, and between the outer cylinder and the outer surface of the cylinder, oil leaked from the upper oil chamber is collected and collected,
Furthermore, an oil leak recovery chamber was formed in which leaked oil could be discharged to the outside.

Therefore, by supplying and discharging oil to the lower oil chamber of the cylinder through the hollow portion of the piston rod, this unit can be expanded and contracted, thereby making it possible to adjust the vehicle height.

(Problems to be Solved by the Invention) However, in such a conventional suspension unit, the piston rod is attached to the vehicle body side and is formed hollow, and the outer cylinder is attached to the axle side. As a result, there were problems as described below.

- Since the oil leakage recovery port formed in the outer cylinder is provided on the axle side (so-called unsprung side) and is displaced relative to the vehicle body, flexible tubes must be used for piping to the vehicle body. Therefore, when mounted on a vehicle, various restrictions arise in order to prevent interference between the flexible tube and other parts. In addition, there arises the problem of ensuring reliability such as flexibility and vibration resistance of the flexible tube.

■ Since the piston rod is formed hollow over its entire length, the manufacturing cost is higher than that of a solid piston rod. Furthermore, since the oil supply/discharge route to the lower oil chamber of the cylinder is long, piping resistance is large, resulting in poor vehicle height adjustment response.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned conventional problems, and in order to achieve this purpose, the suspension unit of the present invention has a cylindrical shape. None, a cylinder tube having a guide member having a rod insertion port provided at the lower end, a rod member slidably inserted into the cylinder tube from the rod insertion port of the guide member with a sealing member interposed; An outer cylinder is provided surrounding the cylinder tube and forms a leakage oil collection chamber between the cylinder tube and the oil leakage chamber for collecting leakage oil from the sealing member, and the upper end of the cylinder tube is connected to a hydraulic power source, etc. an outer cylinder cap equipped with an oil supply and discharge port that communicates the oil supply and discharge passage with the inside of the cylinder tube; and an oil leakage recovery port that is opened in the outer cylinder and discharges leakage oil in the oil leakage recovery chamber. The means is characterized in that the outer cylinder cap is connected to a vehicle body member and the rod member is connected to an axle member.

(Function) Therefore, in the suspension blind unit of the present invention, since the oil leakage recovery port and the oil supply/drainage port are formed in the outer cylinder and the outer cylinder cap that are attached to the vehicle body side, No relative displacement.

In addition, in this suspension unit, when oil is supplied from the oil supply/discharge path, the oil flows into the cylinder tube from the oil supply/discharge port of the outer cylinder cap.
As the amount of oil increases, the cylinder tube and outer cylinder are raised relative to the rod member, thereby extending the suspension unit and adjusting the vehicle height higher.

Conversely, when the oil in the cylinder tube is discharged from the oil supply/discharge port to the oil supply/discharge path, the cylinder tube and outer cylinder are lowered relative to the rod member as the oil decreases, thereby reducing suspension. The desired unit is shortened and the vehicle height can be adjusted lower.

Further, oil leakage generated between the seal member of the guide member and the rod member as the rod member slides is collected in an oil leakage recovery chamber between the cylinder tube and the outer cylinder, and
The oil is discharged from the oil leakage recovery port opened in the outer cylinder.

(Example) Embodiments of the present invention will be described below based on the drawings.

First, the configuration of the first embodiment shown in FIGS. 1 and 2 will be explained.

The suspension unit A according to the first embodiment of the present invention has a second
As shown in the figure, this suspension is used as a vehicle height adjustment actuator in a hydropneumatic suspension system S.

Cylinder tube 10, piston 20, rod member 30
, an outer cylinder 40, an outer cylinder cap 50, and an oil leak recovery port 60.

The hydropneumatic suspension system S uses gas and oil to suspend wheels (not shown), and as shown in FIG. 2, the hydropneumatic suspension system S includes: A controller 104° that outputs a control signal g in response to input signals i from the vehicle height sensor 102 and lateral G sensor 103. A pump 107° that is operated by the motor 105 and discharges oil from the tank 106. Oil from the pump 107. Based on the control signal g from the controller 104, the suspension 22) of the first embodiment is connected to the supply/discharge switching valve 109°■ which supplies and discharges oil to and from A and A via the oil supply/discharge route 108. Gas springs 111, 111° are provided in communication with each suspension unit A via a variable orifice 110. Operating normally open switching valve 112゜■ Suspension unit) A to drain the oil leakage into the oil leakage recovery path 11
The leakage recovery pump 114 degrees or more sends the oil to the tank 106 via the input signal i. There is.

M1 fruit! Example suspension unit) The configuration of A is
This will be explained in detail below with reference to FIG.

The cylinder tube IO has a cylindrical shape, and the upper end of the cylinder is fitted into the small diameter portion 52 of the outer cylinder cap 50 after being sealed by the O-ring 54, and the lower end of the cylinder tube IO is closed by the guide member 13. A piston 20 has a pressure chamber 11 inside and is slidably provided within the cylinder tube 10.
Although the pressure chamber is divided by the piston, it is communicated with each other by a plurality of through holes 21 provided in the piston.

The upper end of a piston rod 30 is fixed to the piston 20 with a nut 31.
It penetrates the guide member 13 and protrudes toward the bottom in the figure.

The guide member 13 has a rod insertion opening 12 for slidably guiding the piston rod 30 on its inner periphery, and a slipper-type decompression seal 15, and a small diameter portion of the outer periphery has an O
When the ring 14 is in a sealed state, it is fitted into the cylinder tube 10, and the large diameter portion of the outer periphery is fitted after the outer cylinder 40 and the O-ring 17 are in a sealed state. 44 indicates an oil seal, and the piston rod 30 The seal retainer 42 has a seal lip and a dust lip that are in sliding contact with the outer cylinder 4 , and its outer peripheral base portion is press-fitted and held in the seal retainer 42 .
0 and is attached by crimping the lower end of the outer cylinder 40.

An oil reservoir chamber 45 is formed between the oil seal 44 and the guide member.
3 through the oil leakage recovery guide hole 16 provided in the outer cylinder 4.
0 and the cylinder tube 10
It is connected to 3.

The outer cylinder cap 50 is fitted with the upper end of the outer cylinder 40 at the large diameter part 51 and fixed by welding, and has an oil supply/discharge port 53 penetratingly opened in the center.
It is connected to the oil supply/discharge path 108 of the hydropneumatic suspension S shown in FIG. 2, and communicates with the pressure chamber 11.

61 indicates a connector provided near the upper end of the outer cylinder 40;
An oil leak recovery port 60 is provided inside, and the oil leak recovery chamber 43 is communicated with the oil leak recovery path 113.

Therefore, the leaked oil collected in the oil sump chamber 45 overflows to the oil leak recovery chamber 43 and is sent from the oil leak recovery chamber 43 to the oil leak recovery path 113 through the oil leak recovery port 60. become.

70 indicates a suspension tube, and the outer cylinder 40 has
It is slidably supported via a first bearing 74 and a second bearing 75, and its upper end is in sliding contact with the outer cylinder 40. The bottom cap 71 has a dust seal 76, and the bottom cap 71 is fixed to the lower end of the piston rod 30 with a nut 72, and a buoyancy bracket 73 for attaching a knuckle spindle (not shown) is fixed to the outer periphery of the suspension tube 70 by welding or the like. has been done.

The unit is put into practical use by attaching the outer cylinder cap 50 to the vehicle body side and attaching the fixing bracket 73 to the axle side.

Next, the operation of the embodiment will be explained.

In the suspension unit (z) A of the embodiment, the wheel is suspended by the spring force of the gas spring 111 with the damping force of the flexible orifice 110.

Further, the controller 104 outputs control signals to the supply/exhaust switching valve 109 and the switching valve 112 according to the vehicle attitude information obtained from the input signal i from the manual switch 101 and the input signal i from the vehicle height sensor 102 and the lateral G sensor 103. do.

When the control signal g causes the supply/discharge switching valve 109 to operate to supply oil to the oil supply/discharge path 108, oil flows from the oil supply/discharge port 53 of the outer cylinder cap 50 into the pressure chamber 11 in the cylinder tube IO. As the amount of oil increases, the cylinder tube 10 and outer cylinder 40 on the vehicle body side rise relative to the suspension tube 70 on the axle side, and the suspension unit A is extended, thereby adjusting the vehicle height higher. be.

Conversely, when the supply/discharge switching valve 109 is operated to discharge oil from the oil supply/discharge path 10B to the tank 106 side by the control signal g from the controller 104, the pressure chamber 11
The oil inside is discharged into the oil supply/discharge path 108, and as the oil decreases, the outer cylinder 40 and the cylinder tube l
O is lowered relative to the suspension tube 70, thereby shortening the suspension unit A and adjusting the vehicle height lower.

Incidentally, the above-described rise and fall of the outer cylinder 40 and the cylinder tube 10 are relative to the suspension tube 70 (rod member 30), and are not displaced relative to the vehicle body.

In addition, the switching valve 112 is normally open, and in this state, both suspension units) A are connected to the two gas springs 11.
1 and 111 are shared, the elasticity becomes low and the riding comfort becomes soft. Then, when the lateral G increases, such as when cornering, the switching valve 112 is closed, and each of the two cars (Svenge Electric Unit) A has one independent gas spring 111, and the elasticity becomes high.
The tilt of the vehicle body is controlled so that it does not become too large.

Also, as the piston rod 30 slides, the sliding member 1
Leakage oil that occurs between the pressure reducing part 15 and the piston rod 30 is collected in the oil reservoir chamber 45, and is released from the oil leakage recovery port 60 through the oil leakage recovery guide hole 16 by the operation of the oil leakage recovery pump 114. It is discharged to the leakage oil recovery path 113 and sent to the tank lO6.

Since the suspension unit A of the first embodiment is constructed as described above, the following features are obtained.

■ Since the oil leak recovery port 60 and the oil supply/discharge port 53 are prevented from being displaced relative to the vehicle body, the oil supply/discharge path 108
Also, there is no need to use a flexible tube for absorbing the relative displacement of the piping of the leakage oil recovery path 113, and there is no interference with the vehicle body, which facilitates the on-vehicle layout.

Further, since the oil supply/discharge port 53 and the oil leakage recovery port 60 are arranged close to each other, it is easy to make the piping compact and arrange it.

■ Oil supply/discharge port 5 is located on the outer cylinder cap 50 closest to the vehicle body.
Since the piston rod 30 is opened, it is not necessary to process the piston rod 30 into a hollow shape, which makes it possible to reduce costs.
The oil supply and discharge path is shortened, reducing pipe resistance, thereby improving control responsiveness.

■ The outer cylinder 40 is supported by the suspension tube 70 and slides up and down, so the piston 20 and the rod member 30
It is possible to prevent deformation from occurring due to a force acting in a direction different from the axial direction between the two.

■ The inverted structure in which the cylinder tube 1O and the outer cylinder 40 are on the sprung upper side and the rod member 30 is on the unsprung lower side increases the rigidity of the sprung upper part, which improves the rigidity of the vehicle and improves the steering stability.In addition, the guide member Since the pressure reduction seal 15 of No. 13 is constantly moistened with oil, even if the vehicle is left for a long time, the resistance of the pressure reduction seal 15 will increase and the pressure reduction seal 15 will not feel rough or be abnormally worn. do not have.

Next, a second embodiment shown in FIG. 3 will be described. still,
In describing the second embodiment, the explanation of the same configuration as the first embodiment will be omitted, and the explanation of the same operation as the first embodiment will be omitted.

The suspension unit) B of the second embodiment is of a type that does not directly support the axle, and the cylinder tube 10 and the outer cylinder 40 are supported only by the rod member 30, and the sliding portion of the piston rod 30 is In this example, a cylindrical dust cover 80 is fixed to the eye 81 together with the rod member 30 to prevent dust from adhering to the oil seal 44 and entering from the oil seal 44.

Note that 82 is a hole for removing air, muddy water, dirt, etc.

The embodiments of the present invention have been described above in detail with reference to FIG.
The specific configuration is not limited to this embodiment, and any design changes or the like that do not depart from the gist of the present invention are included in the present invention.

For example, the hydropneumatic suspension system to which the suspension unit of the present invention is applied is not limited to what is illustrated.

Further, in the embodiment, a cylindrical dust cover is used, but the dust cover is not limited to a bellows-shaped dust cover.

(Effects of the Invention) As explained above, in the suspension unit of the present invention, the oil supply/discharge port and the oil leakage recovery port are provided in the outer cylinder on the vehicle body side (spring upper side), and the relative displacement with respect to the vehicle body is Since there is no need to use flexible tubes for piping, the on-vehicle layout becomes easier, and the reliability of vibration resistance and oil leakage resistance is improved. Moreover, since the oil supply/discharge port and the leakage oil recovery port can be arranged close to each other, it is possible to achieve the effect that the piping can be made more compact and arranged.

Furthermore, since the oil supply/discharge port is opened in the outer cylinder cap, there is no need for hollow processing of the rod member, which reduces costs.In addition, the oil supply/discharge route is shortened, reducing pipe resistance. This has the effect of improving control responsiveness.

In addition, in order to obtain the above effect, the cylinder tube and outer cylinder are on the sprung upper side and the rod member is on the unsprung side, making it an inverted structure.In addition to the above effect, the rigidity of the sprung upper part increases, improving the rigidity of the vehicle. This has the effect of improving handling stability, and in addition, the sealing member of the guide member is constantly moistened with oil, which increases the resistance of the sealing member and prevents it from feeling lumpy even if the vehicle is left alone for a long time. This provides the advantage that no damage occurs or abnormal wear occurs on the sealing member.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a suspension unit according to a first embodiment of the present invention, FIG. 2 is an overall view showing a hydropneumatic suspension system having a unit according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a suspension unit according to a second embodiment of the present invention. FIG. 3 is a cross-sectional view showing an example suspension unit. A, B... Suspension unit 10... Cylinder tube 11... Pressure chamber 12... Rod insertion port 13... Guide member 15... Decompression seal (seal member) 20... Piston 30... ...Piston rod (rod member) 40...Outer tube 43...Oil leakage recovery chamber 50...Outer tube cap 53...Oil supply/discharge port 60...Oil leakage recovery port 108...Oil Supply/discharge path 113...Oil leakage recovery path

Claims (1)

[Claims] 1) A cylinder tube in which a guide member having a cylindrical shape and a rod insertion port is provided at the lower end, and a cylinder tube that is slidable from the rod insertion port of the guide member into the cylinder tube with a seal member interposed therebetween. A rod member that is movably inserted, an outer cylinder that is provided surrounding the cylinder tube and forms a leakage oil collection chamber between the cylinder tube and which collects leakage oil from the seal member; an outer cylinder cap forming an upper end and having an oil supply/discharge port that communicates an oil supply/discharge path communicating with a hydraulic pressure source, etc. with the inside of the cylinder tube; A suspension unit comprising: an oil leak recovery port for discharging oil; the outer cylinder cap is connected to a vehicle body member, and the rod member is connected to an axle member.