JPH02136320A - Stabilizer device of vehicle - Google Patents

Abstract

PURPOSE:To improve the shock absorbing effect mostly when one side wheel is pushed up by providing valves and orifices to link two chambers when a cylinder is expanded and contracted at a speed more than a specific value, to the piston of the cylinder to suppress a roll of the car body. CONSTITUTION:The inside of an input/output cylinder 3 provided between a car body, and the left side or the right side wheel respectively, is divided into the upper and the lower chambers 5 and 6 by piston 4, and a roll of the car body is suppressed in such a composition. In this case, in the piston 4, four orifices 10 penetrating the piston 4 up and down and two pairs of valves 11 are provided. The valves 11 are composed to operate and link both the chambers 5 and 6 only when the expansion and the contraction speed of the I/O cylinder 3 exceeds a specific value. As a result, mostly when one side wheel is pushed up, both the wheels are raised and lowered smoothly independent of each other, to improve the maneuverability and the like.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a stabilizer device for a vehicle, and while it functions as a roll damper only against the roll of the vehicle body, it also functions as a roll damper only when one wheel is pushed up. The present invention relates to a vehicle stabilizer device that can be moved up and down independently of the vehicle body without receiving resistance.

[Conventional technology]

Conventionally, as disclosed in Japanese Utility Model Application Publication No. 150114/1983, a stabilizer device for a vehicle has conventionally been installed between the left and right wheels of a vehicle, and the interior is stabilized by a piston.
Some vehicles are designed to suppress vehicle roll by using a cylinder divided into chambers. In this conventional example, as shown in FIG. 4, each of the left and right wheels 1. ．． ．． Left and right input/output cylinders 301, 3R are respectively mounted between the left and right lower arms 2L, 2R connected to the IR and the vehicle body, and each input/output cylinder 3L, 3. Inside is a piston 41. ．． It is divided by 4H into upper chambers 5t and 5R and lower chambers 6L and 6R. Then, one (left side in the figure) input/output cylinder 31.
The upper chamber 5L and the lower chamber 6R of the other input/output cylinder 3R (on the right side in the figure) are connected by a relay hydraulic system 7.

That is, this relay hydraulic system 7 is equipped with a relay cylinder 8 and a pair of left and right communication oil passages 9L9R, and the relay cylinder 8 has a cylindrical body 81 whose both ends are closed, as shown in FIG.
, a spring 82 housed inside this, a pair of left and right free screws I/N 83I-, 83R that are slidably and oil-tightly fitted into the cylindrical body 81 on both sides thereof; A pair of left and right oil chambers 841, . 84R. In the figure, the oil chamber 84L on the left side is the communication oil passage 9L.
Through the left input/output cylinder 3. It communicates with the upper chamber 5+ of the oil chamber 84. on the right side. + is communicated with the lower chamber 6R of the right input/output cylinder 3R via the communication oil passage 9R. Further, the oil chamber 84L, the communication oil passage 9L, the upper chamber 5L, the oil chamber 84R1, the communication oil passage 9R, and the lower chamber 6R are filled with pressure oil, which is an incompressible fluid.

According to the above-mentioned conventional example, for example, when a roll occurs that causes the left side of the vehicle body to become lower in the figure, the volume of the upper chamber 5L of the left input/output cylinder 3L is expanded, and an amount of pressure corresponding to this volume expansion is generated. Oil is sucked into the left input/output cylinder 3t. As a result, the volume of the oil chamber 84L on the left side of the relay cylinder 8 decreases in accordance with the expansion of the volume of the upper chamber 5L, and the free piston 830. moves to the left. Then, as the free piston 83L moves, the pressure of the spring 82 decreases, and the internal pressure of the right oil chamber 84R decreases. This creates a difference in internal pressure between the oil chamber 84R and the lower chamber 6R of the right input/output cylinder 8, and pressure oil moves from the lower chamber 6R of the right input/output cylinder 8 to the oil chamber 84R. As a result, the right free piston 83° moves leftward following the left free piston 83L. Therefore, the internal pressure of the upper chamber 6R of the right input/output cylinder 3R becomes greater than the internal pressure of the lower chamber 6R, and the lower chamber 6. The volume of 1 is reduced and the height of the right side of the vehicle body is modified to be as low as the left side.

[Problem to be solved by the invention]

By the way, when one of the wheels 1□-1R rises and falls with respect to the vehicle body other than rolling, for example, when only one wheel IL on the left is pushed up, the rising speed of the left wheel II- is faster than when rolling. Much faster, input/output cylinder 3
The difference in internal pressure between the L'1 chamber 5□ and the oil chamber 84 increases rapidly, and the pressure oil in the oil chamber 84L is rapidly moved to the upper chamber 5L of the input/output cylinder 3L. On the other hand, since there is no difference in the internal pressure between the lower chamber 6R of the right input/output cylinder 3R and the right oil chamber 84R, the right free piston 83R hardly moves. Then, the spring 82 expands to compensate for the increased distance between the two free pistons 83L and 83R caused by this, and the right free piston 83.
Therefore, the left input/output cylinder 3L can be rapidly extended without almost moving the right input/output cylinder 3R, and the sudden rise of only the left wheel IL can be prevented from being transmitted to the vehicle body. . However, if the left wheel IL continues to push up as one wheel, the internal pressures of the left and right oil chambers 84L and 84R are equalized, and the right oil chamber 84
A pressure difference occurs between R and the lower chamber 6R of the right input/output cylinder 3R, and in order to eliminate the pressure difference, the oil chamber 84R is moved from the lower chamber 6R to the oil chamber 84R.
Pressure oil flows into the tank, and the right input/output cylinder 3R is shortened, causing the right side of the vehicle to be sunk lower. For this reason,
This will cause discomfort to the driver, etc., and will be disadvantageous in terms of improving maneuverability.

The present invention was made in view of the above circumstances, and its purpose is to function as a roll damper only against the roll of the vehicle body, while ensuring that each wheel receives almost no resistance against one wheel pushing up. The objective is to enable the robot to move up and down relative to the vehicle body independently of each other.

[Means to solve the problem]

In order to solve the above-mentioned problems, a vehicle stabilizer device according to the present invention is provided between the left and right wheels of a vehicle, and suppresses roll of the vehicle by a cylinder whose interior is divided into two chambers by a piston. In the stabilizer device for a vehicle, the piston of the cylinder is provided with an orifice that communicates the two chambers, and a valve that communicates the two chambers when the cylinder expands and contracts at a speed equal to or higher than a predetermined value. It is.

That is, as shown in FIG. 3, the left and right wheels LL and I of the vehicle
The present invention is based on a vehicle stabilizer device in which the roll of the vehicle is suppressed by a cylinder 3 which is provided between R and whose interior is divided into two chambers 5 and 6 by a piston 4, and solves the above problem. To this end, we have taken the following measures:

For example, as shown in FIG. 1, the piston 4 of the cylinder 3 is provided with an orifice 10 that communicates the two chambers 5 and 6, and when the cylinder 3 expands and contracts at a speed higher than a predetermined value, the two chambers 5 and 6 communicate with each other. A valve 11 is provided which communicates with the air.

Note that two cylinders 3 are used, and for example, the left and right lower arms 2L, 2R are connected to the left and right wheels IL, IH, similar to the input/output cylinders 3L, 3R of the conventional example described above.
and the vehicle body. One chamber 5 or 6 of the one cylinder 3 and the other chamber 5 or 6 of the other cylinder 3 are connected via a relay circuit.

In this case, there is no hindrance to further connecting the other chamber 6 or 5 of one cylinder 3 and one chamber 5 or 6 of the other cylinder 3 via another relay circuit. Further, in the present invention, the two chambers 5.6 on both sides of the piston 4 are filled with a pressure transmission medium consisting of an incompressible fluid such as pressure oil or a compressible fluid such as pressurized gas.

[Effect]

According to the present invention, as shown in -1-, both chambers 5 and 6 communicate with each other through the orifice 10 formed in the piston 4, so that the internal pressures of both chambers 5 and 6 are equal in a steady state in which the cylinder 3 does not expand or contract. It has become. If the expansion and contraction speed of the cylinder 3 is less than a predetermined value when the cylinder 3 expands and contracts,
The valve 11 is closed, and both chambers 5 and 6 are connected to the orifice 1.
Although the pressure transmission medium (pressure oil) flows through the orifice 10 from the chamber 6 (or 5) on the side where the volume decreases to the chamber 5 (or 6) on the side where the volume increases, The amount is limited by the orifice 10, creating a damping effect, and the expansion side chamber 5 (
Or, while the internal pressure of 6) is reduced, the internal pressure of the chamber 6 (or 5) on the contraction side is increased, and either one of the chambers 5 or 6 and the chamber 6 or 5 of the other cylinder 3 connected thereto are A difference occurs in the internal pressure of the In order to eliminate this pressure difference, pressure oil moves from chamber 6 or 5 of the other cylinder 3 to chamber 5 or 6 of one cylinder 3, or vice versa, corresponding to the expansion and contraction of one cylinder 3. Then, the other cylinder 3 expands and contracts, and the roll of the vehicle body is reduced. On the other hand, if the expansion/contraction speed of the cylinder 3 is equal to or higher than a predetermined value when the cylinder 3 expands/contracts, the valve 11 opens and the second chamber 5
．． 6 are communicated with each other, an amount of pressure oil corresponding to the amount of displacement of the piston 4 flows from the chamber 6 (or 5) on the contraction side to the chamber 5 (or 6) on the expansion side, and the internal pressure of the two chambers 5 and 6 is almost The cylinder 3 does not change, and the cylinder 3 can be expanded or contracted without any effect on the outside of the expanded or contracted cylinder 3.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A front wheel stabilizer device for an automobile according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 3, input/output cylinders 3, 3 are mounted between the left and right lower arms 2t, 2+t connected to the left and right wheels LL, IR, and the vehicle body, respectively. As shown in FIG. 1, the inside of each input/output cylinder 3 is divided into an upper chamber 5 and a lower chamber 6 by a piston 4 fixed to the vehicle body. Then, as shown in Figure 3, one side (left side in the figure)
The upper chamber 5 of the input/output cylinder 3 and the lower chamber 6 of the other (right side in the figure) input/output cylinder 3 are communicated with each other by a relay hydraulic pipe 12. Both the upper and lower chambers 5, 5, 6.6 of each input/output cylinder 33 and the relay hydraulic pipe 12 are filled with pressure oil to absorb changes in the total internal volume due to expansion and contraction of each input/output cylinder 3, 3. , an accumulator 13 is connected to the relay hydraulic pipe 12.

As shown in FIG. 1, the piston 4 is slidably and oil-tightly fitted into the cylindrical body 31 of the input/output cylinder 3 with a seal member 14 fitted on its circumferential surface. Also, piston 4
As shown in FIG. 2, four orifices 10 and two pairs of valves 11 are provided vertically passing through this.

If each valve 11 is configured to open when the expansion/contraction speed of the input/output cylinder 3 is above a predetermined value to communicate the upper and lower chambers 5 and 6, and to close when the expansion/contraction speed is less than a predetermined value, the configuration is particularly suitable. Not limited. However, here, in order to simplify the configuration as much as possible and improve the workability of assembling the cylinder 3, a pair of through holes are provided that vertically pass through the screws I to 4 and have a much larger hole diameter than the orifice 10. 11a..., and a plate spring llb, 11 that opens and closes these through holes 11a... on the top or bottom surface of the piston 4.
It consists of a leaf valve consisting of b.

Next, the operation of this stabilizer device will be explained using an example in which the left wheel 1 is raised relative to the vehicle body.

For example, when the vehicle body turns by turning the steering wheel to the right, a roll occurs in which the vehicle body sinks on the opposite side to the turning direction, that is, on the left side. In this case, the left wheel IL rises with respect to the vehicle body, and the left cylinder 3 is shortened. As a result, the volume of the upper chamber 5 of the left cylinder 3 is expanded, and the volume of the lower chamber 6 is decreased. In this case, since the expansion and contraction speed of the cylinder 3 is less than a predetermined value, both valves 11 and 11 are closed, and the amount of pressure oil flowing from the lower chamber 6 to the first chamber 5 is limited by the orifice 10, and the upper The internal pressure of chamber 5 decreases. Therefore, a damper effect (damping effect) is obtained, and a difference occurs in the internal pressure between the upper chamber 5 of the left cylinder 3 and the lower chamber 6 of the right cylinder 3, and the pressure oil in the lower chamber 6 of the right cylinder 3 increases. The left cylinder 3 is moved into the chamber 5, and as a result the right cylinder 3 is shortened 1, lowering the right side of the vehicle body and reducing roll.

Next, for example, when the left wheel 1L is suddenly lifted by a protrusion on the road surface, the left cylinder 3 is shortened in the same way, but since its expansion and contraction speed is faster than the predetermined value, The pressure difference between the chamber 5 and the lower chamber 6 suddenly increases, and the pressure difference pushes the plate spring llb on the top side of the piston 4 open toward the 42 chamber 5 side, and the plate spring llb, which was closed by the plate spring llb, is pushed open. The pair of through holes 11a, lla are opened, and the upper and lower compartments 56 are communicated through the large through holes 11a, ], 1a. This communication eliminates the internal pressure difference between the upper chamber 5 and the lower chamber 6, and the rapidly reduced internal pressure of the upper chamber 5 returns to the internal pressure before the cylinder 3 was shortened. This pressure fluctuation is absorbed inside the relay hydraulic vibrator 12, and since the movement of the pressure oil is almost stopped within the input/output cylinder 3 on the left side, the pressure oil in the lower chamber 6 of the input/output cylinder 3 on the right side is affected by the river bank. Unable to do so.
There will be no response as a stabilizer. Furthermore, even if the left inlet/outlet cylinder 3 continues to be shortened, the internal pressure in the first chamber 5 of the left inlet/outlet cylinder 3 is equal to the internal pressure in the lower chamber 6 of the right inlet/outlet cylinder 3. Pressure oil does not move, and there is no risk of the right side of the vehicle becoming lower over time.

When the left input/output cylinder 3 is extended, if the extension speed of the plate spring llb on the lower surface of the piston 4 is less than a predetermined value, the through holes 11a and lla are closed, and the upper chamber 5
As the internal pressure of the vehicle rises, pressure oil moves through the relay hydraulic pipe 12 to the lower chamber 6 of the right input/output cylinder 3, and the right input/output cylinder 3 extends and lifts the right side of the vehicle body. rolls are reduced. Further, when the extension speed of the right input/output cylinder 3 is equal to or higher than a predetermined value, the through holes 11a and lla are opened, and the upper chamber 5 of the left input/output cylinder 3 is opened without affecting the right input/output cylinder 3 at all. Pressure oil moves from there to the lower chamber 6, and the response as a stabilizer disappears.

〔Effect of the invention〕

As described above, the vehicle stabilizer device of the present invention is provided between the left and right wheels of the vehicle, and the interior is divided by the piston.
In a vehicle stabilizer device that suppresses vehicle roll using a cylinder divided into chambers, the piston of the cylinder is provided with an orifice that communicates the two chambers, and the cylinder expands and contracts at a speed greater than a predetermined value. This configuration is provided with a valve that allows the two chambers to communicate with each other when doing so.

Therefore, when the expansion speed of the cylinder is less than a predetermined value, the valve is closed, a damper effect is produced due to the flow path resistance of the orifice, and the other cylinder can be expanded and contracted to suppress the roll of the vehicle body. In addition, when the expansion speed of the cylinder exceeds a predetermined value, the valve is opened and the two chambers of the cylinder are communicated with each other, so that the pressure transmission medium flows from the chamber on the contraction or compression side to the chamber on the expansion or expansion side. The cylinder is expanded and contracted to smoothly follow the rise and fall of the wheels, and the internal pressure fluctuations in the chamber connected to the other cylinder are so small that they are not transmitted to the other cylinder. One cylinder can be expanded and contracted independently of the other cylinder. Also, even if one cylinder is held in a contracted or extended state,
Since there is no transfer of pressure transmission medium from one of the cylinders to the other, the stabilizer function will not be restored over time, and one side of the vehicle will not sink or float, increasing maneuverability. be able to.

Furthermore, since an orifice and a valve only need to be added to the piston of each cylinder, the structure is simple and can be implemented easily and inexpensively.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a longitudinally sectional front view of a part of the input/output cylinder of a stabilizer device for a front wheel of an automobile, and FIG. 3 is a block diagram of a stabilizer device for a front wheel of an automobile, FIG. 4 is a block diagram of a conventional example, and FIG. 5 is a longitudinal sectional view of the relay cylinder shown in FIG. 4. 11 is the left wheel, IR is the right wheel, 3 is the input/output cylinder,
4 is a piston, 5 is a first chamber, 6 is a lower chamber, 10 is an orifice, and 11 is a valve.

Claims (1)

[Scope of Claims] 1. A stabilizer device for a vehicle that suppresses the roll of the vehicle by a cylinder provided between the left and right wheels of the vehicle and whose interior is divided into two chambers by a piston, comprising: a piston of the cylinder; A stabilizer device for a vehicle, characterized in that an orifice that communicates between the two chambers is provided, and a valve that communicates between the two chambers when the cylinder expands and contracts at a speed equal to or higher than a predetermined value.