JPS6082415A - Suspension apparatus for car - Google Patents

Abstract

PURPOSE:To prevent gas leak and permit the substitution for the conventional suspension apparatus by dividing the inside by an expandable partitioning film and arranging a hollow rod having an orifice into an oil cylinder and dividing and forming an oil accommodation part and a compressed-gas accommodation part. CONSTITUTION:When a hollow rod 10 is applied with a force in the direction to be pushed into a cylinder 3, the oil in an oil chamber 4 flows into an orifice 11 and the oil accommodation part 28 of the hollow rod 10 and expands a partitioning film 25 by the inflow portion and compresses the gas in a gas accommodation part 29, and buffer function is developed by the repulsive force. When the hollow rod 10 is extended, the partitioning film 25 contracts on the contrary. The spring constant can be reduced by allowing the gas accommodation part 38 of a subactuator and the gas accommodation part 29 to communicate each other through an opening and closing selector valve 47. Thus, gas leak is prevented, and the substitution performance for the conventional start suspension can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle suspension system provided in a suspension mechanism of an automobile or other vehicle.

Conventionally, as a type of vehicle suspension system, one using a hydraulic pneumatic actuator is known. In other words, the conventional device for this plow is one in which compressed gas and oil are sealed in an actuator equipped with a cylinder and a rond that is telescopically inserted into the cylinder. Damping force can be obtained by circulating oil through the trap and orifice. However, at the points where the oil and compressed gas come into contact with each other, it is necessary to prevent gas from getting mixed in with the oil. A common method is to use a free piston. However, in this case, the sliding resistance of the free piston poses a problem, and even if a free piston is used, gas may leak into the pond during long-term use.

On the other hand, as seen in Japanese Patent Publication No. 55-18291, for example, a spherical auxiliary chamber (accumulator) is attached to the side or head of the actuator, and an elastic diaphragm is provided inside this auxiliary chamber. There are also known devices in which the stations are separated from each other. However, in this case, a spherical auxiliary chamber is added to the normal actuator, so the shape of the mounting part is smaller than that of a conventional suspension system (strut suspension) consisting of a shock azonoper and a coil spring. Since the suspension system changes, it has the disadvantage that it is not compatible with conventional suspension systems, making it difficult to install it on the vehicle.

The present invention was made based on the above circumstances, and its purpose is to be able to reliably separate oil and compressed gas, improve reliability regarding gas leakage, and to be compatible with conventional strut suspensions. An object of the present invention is to provide a suspension system for a vehicle.

That is, the gist of the present invention is to provide a cylinder containing oil, a hollow rod having a damping force-generating orifice inserted into the cylinder with a telescopic button and allowing the oil to flow, and a longitudinal cylinder inside the hollow rod. an expandable/contractable rod which is housed along the direction and divides the inside of the hollow rod into an inner part and an outer part, and forms an oil storage part on the side communicating with the orifice and a compressed gas storage part on the other side. The present invention includes a partition membrane and a rod-shaped body for fixing the membrane that penetrates the inside of the partition membrane in the longitudinal direction.

According to the above configuration, the oil and the compressed gas are completely separated by the partition membrane, and changes in oil volume caused by expansion and contraction of the rod can be absorbed by the expansion or contraction of the partition membrane. .

Therefore, the effect of blocking oil and gas is higher than that of conventional free pistons, and it is possible to reliably prevent gas from penetrating into oil. Furthermore, since the partition membrane is housed in the hollow rod along the longitudinal direction and is fixed by a membrane fixing rod-shaped body that penetrates the inside of the partition membrane in the longitudinal direction, the external shape of the cylinder or hollow rod is different from that of the conventional one. The strut suspension is not significantly different from that of the new model. Therefore, it is an extremely useful invention as it is compatible with conventional suspension systems and can be installed on vehicles with existing specifications, including vehicles in the production process.

The first embodiment of the present invention will be described below in Figures 1 to 3.
This will be explained with reference to the figures. In the figure, 1 is the main actuator, 2
indicates a secondary actuator. The main actuator 1 is constructed as described below. That is, 3 in the figure is a cylinder, and this cylinder 3 is provided with an oil chamber 4 containing oil. Furthermore, a mounting portion 5 is provided on the lower end side of the cylinder 3 in the drawing, for example, for mounting to a member on the axle side. Also, the parts on the upper end shown are the oil seal 6, dry bearing 7, and rebound stopper 8.
is attached.

Further, a hollow rod 1o is telescopically inserted into the cylinder 3. This hollow rod 1° is provided with a damping force generating orifice 11 through which the oil flows, at its lower end in the drawing. This damping force generating orifice 11 is a well-known plate valve 12, as illustrated in FIGS. 2 and 3.
13, and a variable orifice 17 that can be opened and closed as the drive rod 16 rotates. The drive rod 16 passes through the center of the hollow rod 10 in the longitudinal direction and is driven by a rotating solenoid 18. In addition, the hollow rod 10 includes a pan para rubber 19, an oil sealing inlet 21 sealed with a plug 20, and a gas inlet/outlet 2.
2. A protection tube 23 is also provided. The hollow rod 10 is attached to a member on the vehicle body (not shown).

A partition membrane 25 is provided inside the hollow rod 10 along its longitudinal direction (axial direction) K. The partition membrane 25 is made of an elastic polymer material and is also called a plug, and is open at both ends 26 and 27 and has a generally cylindrical shape, but the circumferential direction has a pleated or wavy shape. It has an appropriate shape, and can be expanded and contracted to change its internal volume.

The inside of the hollow rod 10 is divided into an inner part and an outer part by the partition film 25. An oil storage section 28 is formed on the side that communicates with the damping force generating orifice 1 (inner side in the illustrated example), and a compression gas storage section 29 is formed on the side that communicates with the other side opening 22. .

The partition membrane 25 is fixed to the hollow rod 10 by a rod-shaped body 30 having a cylindrical shape. This rod-shaped body 3Q has pressing portions 31 and 32 near both ends thereof for crimping and fixing the ends 26 and 27 of the partition membrane, and these pressing portions 31 and 32 press and hold the ends 26 and 27 of the partition membrane. , 27 are fixed in a liquid-tight manner. Note that the drive rod 16 is inserted through the center of the hollow rod-shaped body 30. Further, the gas storage section 29 is filled with nitrogen gas under high pressure, for example.

On the other hand, the sub actuator 2 is also provided with a partition membrane (plug) 35, and the inside of the cylinder 36 is divided into an oil storage section 37 and a compression gas storage section 38. The partition membrane 35
A rod-shaped body 39 for fixing the membrane passes through the center of the membrane, and pressing portions 40 and 41 provided on the rod-shaped body 39 fix both ends 42 and 43 of the partition membrane in a liquid-tight manner.

A gas inlet/outlet 45 is connected to the compressed gas storage section 38.
The gas inlet/outlet 22 of the main actuator 1 is connected to the main actuator 1 via a gas pipe 46 and an on/off switching valve 47 . Further, a hydraulic unit 49 is connected to an oil inlet/outlet 48 connected to the oil accommodating portion 37, so that oil can be taken in and out of the oil accommodating portion 37. The hydraulic unit 49 includes a hydraulic power source 50, a switching valve 51 for oil supply, and a switching valve 52 for oil discharge.
and a drain 53.

In the suspension system having the above configuration, when the hollow iron 10 receives a force in the direction of being pushed into the cylinder 3 due to unevenness of the road surface while the vehicle is running, oil in the oil chamber 4 flows into the orifice 11.
It flows into the oil storage section 28 on the hollow iron side through the oil tank. Therefore, the amount of oil in the oil storage portion 28 increases, and the partition membrane 25 expands in accordance with this increased amount, compressing the gas in the gas storage portion 29 to an even higher pressure. Therefore, the repulsive force can provide a buffering function. Also, the hollow rod 10 is connected to the cylinder 3.
When a force is applied in a direction in which the partition membrane 25 is stretched, the oil flows in the opposite direction to that described above, and the oil in the oil storage section 280 flows out to the oil chamber 4 side, so that the partition membrane 25 contracts.

Further, according to the above-mentioned embodiment, when the on-off switching valve 47 is opened and communicated with the gas accommodating portion 38 of the sub actuator, both gas accommodating portions 29 and 38 act as springs, so that the spring constant can be lowered. I can do it. In addition, if the on-off switching valve 47 is closed, the main actuator's gas storage section 29
Since the spring acts as a gas spring, the spring constant can be increased.

Furthermore, the magnitude of the damping force can be arbitrarily changed by rotating the drive rod 16 using the rotary solenoid 18 and opening and closing the variable orifice 17 (see FIG. 3) to change the cross-sectional area of the flow path. You can also do that.

This embodiment also has a vehicle height adjustment function.

That is, if you want to raise the vehicle height, open the switching valve 51 and feed the VC oil into the oil storage section 37 of the sub actuator.
The partition membrane 35 is expanded to further compress the gas. This also increases the pressure in the gas storage section 29 of the main actuator), allowing the hollow rod 10 to be set at a desired height.

Note that in this case, it is necessary to keep the on-off switching valve 47 open. Further, when it is desired to lower the vehicle height, the oil can be discharged from the oil storage portion 37 by opening the oil discharge switching valve 52 and closing the oil supply switching valve 51, contrary to the above.

According to the suspension device described above, the main actuator 1 and the sub actuator 2 are the gas-liquid partition membranes 2s and ss, respectively.
Since the gas and oil are separated, it is possible to reliably prevent gas from leaking into the oil side. Moreover, the above partition membrane 25.3
5 is housed inside each actuator 1, 2,
The outer shape of the actuator 1.2 is either completely unchanged from the usual one or only slightly changed in shape. Therefore, it can be attached to the attachment part of a conventional strut suspension to a vehicle. In other words, it can be installed as is on vehicles with existing specifications, including strut suspensions and compatible power suspensions, and Ikuhiko process vehicles.

Note that FIG. 4 shows a second embodiment of the present invention. This embodiment is a predecessor of the first embodiment in which the sub actuator [as well as the main actuator 1] is used alone. Since the structure of the actuator 1 of this embodiment is basically the same as that described in the first embodiment, the same reference numerals are given to the common parts and the explanation thereof will be omitted. However, in the case of this example,
This embodiment differs from the first embodiment in that a hydraulic unit 49 is connected to the oil sealing port 21, and the gas inlet/outlet 22 is sealed with a plug 55. This hydraulic unit 49 is constructed in the same manner as that shown in FIG. Further, as a preferable example, a drain 56 is connected to the sliding portions of the cylinder 3 and the rod 1o, so that oil can be recovered.

According to the second embodiment having the above configuration, by changing the amount of oil in the oil storage part 28 using the hydraulic unit 49, the capacity or pressure of the gas storage part 29 can be changed, and therefore the vehicle height can be changed. Can be adjusted.

Further, FIG. 5 shows a third embodiment of the present invention, in which the gas input/exit is 22Kf! The compression f
A sub-actuator 2 containing only a base is connected.

The rest of the structure is the same as that of the second embodiment shown in FIG. Therefore, according to this embodiment, the height can be adjusted by the hydraulic unit 49, and by opening and closing the on-off switching valve 47, the effective volume of the gas spring can be switched in two stages. , the spring constant can be changed.

In addition, if there is no need to adjust the vehicle height or change the spring constant, as shown in FIG. 6 as the fourth embodiment,
The oil seal inlet 21 and the gas inlet/outlet 22 are plugged with plugs 20.55 and 20.55, respectively.
You can also use it to block it and have the main actuator function alone.

As described above, according to the present invention, it is possible to provide a spring-type vehicle suspension system that can prevent compression leakage and is compatible with conventional suspension systems.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the suspension system, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. A partial cross-sectional view along the line ■-■ in FIG. 2, FIG. 4 is a partial cross-sectional view showing the second embodiment of the present invention, and FIG. 5 is a partial cross-sectional view showing the third embodiment of the present invention. , 6th
The figure is a partial sectional view showing a fourth embodiment of the present invention. 0 1... Main actuator, 2... Sub-actuator, 3... Cylinder, 4... Oil chamber, 1θ... Hollow rod , 11... Damping force generating orifice, 25... Partition membrane, 28... Oil storage section, 29... Compressed gas storage section, 30... Rod-shaped body. Applicant's agent Takehiko E, patent attorney

Claims (1)

[Scope of Claims] A cylinder containing oil; a hollow rod that is telescopically inserted into the cylinder and has a damping force generating orifice through which the oil flows; and an expandable and deflated partition membrane which divides the interior of the hollow rond into an inner part and an outer part to form an oil storage part on the side communicating with the orifice and a compressible gas storage part on the other side; A vehicle suspension system comprising: a rod-shaped member for fixing a membrane that penetrates the inside of the membrane in the longitudinal direction;