JPH074968Y2 - Torsion bar stabilizer device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a torsion bar type stabilizer device arranged between left and right suspension devices of an automobile.

2. Description of the Related Art As is well known in the prior art, in automobile suspensions, there are various stabilizer devices that set the relative size of the roll rigidity of the vehicle body to a desired size to obtain steering stability during cornering of the vehicle. It is provided, and an example thereof is that described in Japanese Utility Model Laid-Open No. 63-40214 filed previously by the present applicant.

This is a torsion bar type stabilizer device for associating left and right suspension members with each other, and at any part of the torsion bar of the stabilizer device for connecting the left and right suspension members, a split portion for cutting the mutual relationship between the left and right suspension members. And a cylinder that is provided at one of the divided ends, and a piston that divides the inside of the cylinder into two hydraulic chambers is provided at the other divided end, and the two hydraulic pressures of the cylinder wall are further provided. The first and second through holes are formed at the portions located near the outer ends of the chamber, respectively, and the third through holes are formed at the substantially central portions of the both through holes, and the first and second through holes are formed. A first opening / closing valve is provided in a first communication passage connecting the holes, and a second communication passage is provided in parallel with the first communication passage.
A check valve that connects the flow passage communicating with the third through hole and allows the working fluid to flow from the third through hole only in the first and second through hole directions is provided by closing the opening / closing valve. Both the torsion bars are configured to rotate only in the phase reduction direction and to be fixed at a position where the phase becomes zero.

However, in the above-mentioned conventional device, the two torsion bars, that is, both suspension members are rotated in the direction in which the phase is reduced by the closing operation of the opening / closing valve as described above, so that the phase becomes zero. It is designed to be connected and fixed at a certain position, and therefore, there is only two-step control of connection and disconnection. For this reason, it is impossible to perform highly accurate control corresponding to complicated road conditions and running conditions.

Means for Solving the ProblemsThe present invention has been devised in view of the problems of the above-described conventional device, and is provided in any part of the stabilizer device including the connecting portions of the left and right suspension members that are mutually related, A split portion is formed that disconnects the left and right suspension members from each other, and a cylinder is provided at the split end portion on one side,
A piston that divides the inside of the cylinder into two hydraulic chambers is provided at the other end on the other side, and the cylinder wall is provided with the above-mentioned piston.
The first and second parts are located near the outer ends of the two hydraulic chambers.
A through hole is formed, a third through hole is formed at a substantially central portion of both through holes, and a first opening / closing valve is provided in a first communication passage that connects the first and second through holes. A flow passage communicating with the third through hole is connected to a second communication passage arranged in parallel with the first communication passage, and the hydraulic fluid is flown only from the third through hole toward the first and second through holes. In a torsion bar type stabilizer device provided with a check valve for permitting circulation, a pair of plural passages are provided between the first and second through holes of the cylinder wall at substantially symmetrical positions about the third through hole. It is characterized in that a hole is bored and an on-off valve is provided in each of the communication passages that communicate the pair of through holes.

Operation According to the present invention having the above-described configuration, when the first opening / closing valve is opened, the working fluid in each hydraulic chamber has the first, second through hole and first
Substitution flow is performed through the communication hole, and the piston and the cylinder relatively freely rotate, so that both suspension members rotate independently. On the other hand, when the first on-off valve is closed, the displacement flow between the hydraulic chambers is blocked, and the hydraulic fluid in the hydraulic chamber on the one side becomes the third hydraulic fluid.
It flows into the hydraulic chamber on the other side through a through hole or the like. Therefore, the piston is allowed to rotate toward the third through hole side (phase zero side) and is prevented from rotating toward the phase expansion side. Here, when an on-off valve other than the first on-off valve is appropriately selected and opened, a pair of through holes corresponding to the on-off valve communicate with each other, and therefore, similar to the case where the first on-off valve described above is opened. The hydraulic fluid in both hydraulic chambers is freely displaced and flows so that the piston and the cylinder freely rotate relative to each other between the two through holes. Therefore, both suspension members can rotate independently of each other in a narrower range than the above case in the direction of phase reduction and expansion.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view taken along the line AA of FIG. 2, and FIG. 3 is a schematic view showing the whole stabilizer device according to the present invention. Reference numeral 1 in FIG. 3 denotes a substantially U-shaped stabilizer having both ends connected to a suspension arm and rotatably supported by a vehicle body via brackets 2 and 3.
2 is divided into left and right portions near the center as shown in FIG. 2 to form two torsion bars 4 and 5, and a cylindrical cylinder 6 is provided at the divided end of the torsion bar 4 on one side. A piston 7 is fixed coaxially with the axis of the torsion bar 4 and is housed in the cylinder 6 at the divided end of the torsion bar 5 on the other side so as to be rotatable in the circumferential direction.
Is fixed. As shown in FIG. 1, the cylinder 6 has partition walls 8 and 9 each having a fan-shaped cross section arranged to face each other on a diametrical inner wall, and the piston 7 is slidable between the facing inner surfaces of the partition walls 8 and 9. It is supported. This piston 7
Is a plate-shaped vane part 1 provided at both outer ends of the diametrical direction.
The first to fourth hydraulic chambers 11, 12,
Two communication holes 15 and 16 are formed in the interior, which are divided into 13 and 14 and communicate with each other at the diagonal positions of the hydraulic chambers 11, 13 and 12, 14 respectively. In addition, the cylinder 6
The first and second through holes 17, 18 are formed at the cylindrical wall of the first hydraulic chamber 11 and the second hydraulic chamber 12 near the outer ends thereof. A third through hole 19 is formed in a portion located substantially in the center of the through holes 17 and 18.

Furthermore, between the first and second through holes 17 and 18, a pair of outer fourth through hole 29 and fifth through hole 3 are located at symmetrical positions with respect to the third through hole 19.
0, and a pair of inner sixth through hole 31 and seventh through hole 32 are provided respectively.

In the figure, 20 is a hydraulic circuit mechanism, and this hydraulic circuit mechanism 20
Is a first communication passage 21 having one end connected to the first communication hole 17 and the other end connected to the second communication hole 18, and a second communication passage 22 connected in parallel with the first communication passage 21. And one end of the fourth through hole 29,
A third communication passage 33 having the other end connected to the fifth communication hole 30 and a fourth communication passage 34 having one end connected to the sixth communication hole 31 and the other end connected to the seventh communication hole 32, respectively. I have it. Further, the first communication passage 21, the third communication passage 33, and the fourth communication passage 34 are first and second two-way type that are opened and closed based on an output signal from a vehicle body roll sensor or the like.
The second and third solenoid valves 23, 35, 36 are provided respectively. And
When any one of these solenoid valves 23, 35, 36 is opened appropriately,
The first hydraulic chamber via the first, third, and fourth communication passages 21, 33, 34 described above.
11 and the second hydraulic chamber 12 communicate with each other to allow the displacement flow of the working fluid to the respective chambers 11, 13-12, 14 and
When the whole is closed, the fluid pressure chambers 11, 13-12, 14 are disconnected from each other.

On the other hand, the second communication passage 22 has a flow passage 24, one end of which is connected to the central portion 22a and the other end of which is connected to the third through hole 19, and the first communication hole 17 side and the second communication hole 22 are connected to each other. In the middle of each of the holes 18 side,
Two check valves 25 and 26 are provided to allow the movement of the hydraulic fluid only from the flow passage 24 toward the first and second through holes 17 and 18, respectively. Further, an accumulator 28 is connected to the central portion 22a via a hydraulic pressure introduction passage 27, and the accumulator 28 supplies the hydraulic oil in the hydraulic circuit.
It is designed to compensate for returns.

The operation of the above embodiment will be described below. First, when the solenoid valve 23 is “opened” by an output signal from a roll sensor or the like, the first and second hydraulic pressure chambers 11, 1 are connected via the first communication passage 21.
2 communicates, so piston 7 and cylinder 6
The X arrows in FIG. 1 freely rotate in the clockwise or counterclockwise direction in the relative relationship between the two 6,7, that is, both torsion bars 4, 5 freely rotate in their respective twisting directions. When the solenoid valves 23, 35, 36 are all "closed", when the piston 7 and the cylinder 6 are "closed" at the rotational position shown by the alternate long and short dash line in FIG. 1, for example, 1 hydraulic chamber 11 and 2nd
Since the communication of the first, third, and fourth communication passages 21, 33, 34 of the hydraulic chamber 12 is cut off, the hydraulic fluid in the second hydraulic chamber 12 is generated by the relative rotation of the piston 7 and the cylinder 6. It flows only into the first hydraulic chamber 11 through the third through hole 19-flow passage 24-check valve 25-first through hole 17. Therefore, the piston 7 is allowed to rotate only in the direction of the center of the stroke, that is, in the direction of the third through hole 19, and cannot rotate in the direction of the first through hole 17. Therefore, although the torsion bars 4 and 5 freely rotate in the direction in which the phase decreases, they do not rotate in the direction in which the phase expands, and therefore gradually rotate while being corrected in the same phase direction. It is fixed at the position where is zero (the position shown by the solid line in FIG. 1). Therefore, both torsion bars 4,5
The stabilizer function is exerted by connecting the two to achieve high-speed stability.

Furthermore, when the first solenoid valve 23 is closed, for example, only the second solenoid valve 35 is selectively opened, and the vane portion 10 is
When located between the fourth and fifth through holes 29 and 30, the third communication passage 3
Since the first and second hydraulic chambers 11 and 12 communicate with each other through the piston 3, the piston 7 and the cylinder 6 are arranged in the relative relationship between the pistons 6 and 7 between the fourth and fifth through holes 29 and 30 (Y arrow). Rotate freely in the (between) direction to reduce or expand the phase. In addition, the first and second solenoid valves 23,35
Is closed and only the third solenoid valve 36 is selectively opened, the hydraulic chambers 11 and 12 communicate with each other through the fourth communication passage 34, so that the piston 7 and the cylinder 6 are in the sixth position. , 7th through hole 3
Rotate freely between 1,32 (between Z arrows) in the direction of phase reduction and expansion.

Thus, in this embodiment, by selectively opening the second and third solenoid valves 35 and 36 when the first solenoid valve 23 is closed,
Since the piston 7 and the cylinder 6 can freely rotate relative to the phase reduction or enlargement side within a predetermined range, highly accurate control according to the road surface condition and the running condition becomes possible, and the vehicle can be run on rough roads. The stability is further improved.

Further, in this case, the rotation range of the piston 7 and the cylinder 6 is only freely rotated between the Y arrows or between the Z arrows, and further relative rotation to the phase expansion side is prevented. The stabilizer function is effectively exhibited, and running stability at medium and high speeds can be achieved.

Further, it goes without saying that the entire apparatus can be made compact.

The present invention is not limited to this embodiment, and the cylinder and the piston may be configured as a vertically sliding type instead of a rotating type.

EFFECTS OF THE INVENTION As is clear from the above description, according to the torsion bar type stabilizer device according to the present invention, particularly the cylinder wall first
Between the first and second through holes, a pair of through holes are formed at symmetrical positions with respect to the third through hole, and an on-off valve is provided in each of the communication passages communicating the pair of through holes. Since the above-mentioned structure is provided, it is possible to change the freely rotatable phase range of both torsion bars by selectively opening and closing each on-off valve. Therefore, it is possible to perform highly accurate control according to the road surface condition and the vehicle running condition, and further improve the stability especially when running on a bad road.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 2 showing an embodiment of the present invention, FIG. 2 is a plan sectional view showing a main part of this embodiment, and FIG. 3 shows a stabilizer device of this embodiment. It is a top view shown. 6 ... Cylinder, 7 ... Piston, 11 ... 1st hydraulic chamber, 12 ... 2nd hydraulic chamber, 17 ... 1st through-hole, 18 ... 2nd through-hole, 19 ... 3rd through-hole, 21 ... 1st connection Passage, 22 ... second communication passage, 23 ... first solenoid valve (first opening / closing valve), 24 ... flow passage, 25, 26 ... check valve, 29 ... fourth through hole, 30 ... fifth through hole, 31 ... 6th through hole, 32 ...
7th through-hole, 33 ... 3rd communicating passage, 34 ... 4th communicating passage, 35 ... 2nd
Solenoid valve (open / close valve), 36 ... Third solenoid valve (open / close valve).

Claims (1)

[Scope of utility model registration request] 1. A split portion for disconnecting the left and right suspension members from each other is formed at any part of a stabilizer device including a connecting portion of left and right suspension members which are mutually related, and the split end portion on one side is formed. Is provided with a cylinder, and a piston for partitioning the inside of the cylinder into two hydraulic chambers is provided at the other divided end, and the piston is located near the outer ends of the two hydraulic chambers of the cylinder wall. Part, first
First and second through-holes are formed, a third through-hole is formed substantially in the center of the both through-holes, and a first open / close valve is provided in the first communication passage connecting the first and second through-holes. And a flow passage communicating with the third through hole is connected to the second communication passage arranged in parallel with the first communication passage, and only from the third through hole toward the first and second through holes. In a torsion bar type stabilizer device provided with a check valve for allowing the flow of hydraulic fluid, a pair is provided between the first and second through holes of the cylinder wall at substantially symmetrical positions about the third through hole. A plurality of through holes are provided, and an on-off valve is provided in each of the communication passages that connect the pair of through holes to each other, and a torsion bar type stabilizer device.