JP2001233035A - Suspension device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize pressure regulating cylinders forming first and second oil chambers and to reduce manufacturing costs. SOLUTION: A rotor 34 is provided inside a cylindrical housing 33 with both ends blocked so as to freely rotate using an axis of the housing 33 as a rotational axis. A stationary bulkhead 35 is provided on the housing 33 so as to bisect space with an annular cross section between an inner circumferential face of the housing 33 and the rotor 34 in a circumferential direction. A pair of movable bulkheads 36 are provided on the rotor 34 so as to bisect each of the bisected space. A pair of space facing each other with the axis of the housing 33 in between of the space quartered in the circumferential direction between the housing 33 and the rotor 34 by these bulkheads are used as the first oil chamber 14 and the second oil chamber 17 of the pressure regulating cylinders.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension system for a vehicle used for an automobile or the like.

[0002]

2. Description of the Related Art A conventional vehicle suspension system is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-132846. The vehicle suspension system disclosed in this publication will be described with reference to FIG. FIG. 4 is a sectional view showing a configuration of a conventional vehicle suspension system. In the figure, a suspension device denoted by reference numeral 1 is a pair of hydraulic shock absorbers 2 provided on a left side and a right side of a vehicle body.
2 and a pressure regulator 3 connected to the hydraulic system of these hydraulic shock absorbers 2 and 2.

[0003] The two hydraulic shock absorbers 2 have the same structure as each other, and a piston 5 defines an upper oil chamber 6 and a lower oil chamber 7 inside a cylinder body 4 filled with hydraulic oil. I have. The piston 5 has a communication passage 9 for communicating the upper oil chamber 6 and the lower oil chamber 7 via a throttle 8. Further, these hydraulic shock absorbers 2 pivotally support the lower end of the cylinder body 4 together with wheels such as wheel suspension links (not shown) at a position vertically moving with respect to the vehicle body. The upper end is connected to the vehicle body side (not shown) of the automobile.

The pressure control device 3 is provided with a first pressure control cylinder 11 connected to a lower oil chamber 7 of the hydraulic shock absorber 2 on the left side of the vehicle body.
And a second pressure adjusting cylinder 12 connected to the lower oil chamber 7 of the hydraulic shock absorber 2 on the right side of the vehicle body. These pressure adjusting cylinders 11 and 12 are integrally formed in one bottomed cylindrical housing 13 so as to be aligned on the same axis. The axis is indicated by a dashed line. The first pressure regulating cylinder 11 has a first oil chamber 14 having a circular cross section connected to the lower oil chamber 7 of the hydraulic shock absorber 2 on the left side of the vehicle body, and the volume of the first oil chamber 14 is disc-shaped. It can be changed by the first movable partition 15 having a rectangular shape.

The second pressure regulating cylinder 12 is formed so as to have a diameter larger than that of the first pressure regulating cylinder 11, and is connected to the axial center of the first movable partition 15. A structure is adopted in which the volume of the second oil chamber 17 having an annular cross section can be changed by the use of 16. The second oil chamber 17 is connected to the lower oil chamber 7 of the hydraulic shock absorber 2 on the right side of the vehicle body, and the second oil chamber 17 and the first oil chamber 14 are connected to a first movable partition 15. They are communicated with each other via an aperture 18 provided.

The reason why the second pressure regulating cylinder 12 is formed so as to have a larger diameter than the first pressure regulating cylinder 11 is as follows.
This is because the effective sectional area of the second oil chamber 17 matches the effective sectional area of the first oil chamber 14. That is, 1 of both oil chambers
By matching the effective sectional areas of the first and second movable partitions 15, 4 and 17, the volumes of the oil chambers 14 and 17 are always equal when the first and second movable partitions 15 and 16 move integrally.

The second pressure adjusting cylinder 12 has a second
There is provided an urging means 19 for pressing the movable partition 16 toward the second oil chamber 17 to keep the oil pressure of the first and second oil chambers 14 and 17 always positive. This urging means 19
Is a lid 2 at the open end of the cylindrical housing 13 having the bottom.
0 is fitted and fixed, and the space 21 formed between the lid 20 and the second movable partition 16 is filled with high-pressure gas. The urging means 19 presses the second movable partition 16 with the high-pressure gas to maintain the hydraulic pressures of the first and second oil chambers 17 at a positive pressure, so that the oil pressures of these two oil chambers 14 and 17 decrease. Sometimes cavitation can be prevented. That is,
When the oil pressure in both oil chambers 14 and 17 decreases, the air bubbles mixed in the hydraulic oil can be prevented from expanding. Therefore, when the oil pressure in both oil chambers 14 and 17 increases, the air bubbles contract. As a result, it is possible to prevent the amount of hydraulic oil from changing and the damping force from changing.

In the conventional vehicle suspension system 1 configured as described above, when the vehicle body swings in the left-right direction during rolling or the like, the first oil chamber 14 and the second oil chamber 17 of the pressure adjusting device 3 are provided. And a pressure difference is generated between the first pressure chamber 14 and the second pressure regulating cylinder 12 of the first pressure regulating cylinder 11.
Hydraulic oil flows through the throttle 18 between the second oil chamber 17. For this reason, at the time of rolling, each hydraulic shock absorber 22
Resistance when hydraulic oil passes through the throttle 8 of the pressure regulator 3
Thus, a damping force is generated that includes the resistance when the hydraulic oil passes through the third throttle 18.

On the other hand, when the two hydraulic shock absorbers 22 operate in the same direction during pitching or bouncing, the pressure difference between the first oil chamber 14 and the second oil chamber 17 is reduced. As a result, the amount of hydraulic oil passing through the throttle 18 of the pressure adjusting device 33 decreases. Therefore, the damping force becomes relatively small. At this time, the first and second movable partitions 15, 1
6 moves up and down in FIG.

[0010]

In the conventional vehicle suspension 1 constructed as described above, the diameter of the second pressure adjusting cylinder 12 of the pressure adjusting device 3 is larger than that of the first pressure adjusting cylinder 11. Therefore, there is a limit in reducing the size of the pressure regulator 3. The reason why the diameter of the second pressure adjusting cylinder 12 is relatively large is that the second movable partition 16 has a portion facing the first movable partition 15 (a portion that does not function as a pressure receiving portion). This is because the diameter of the second movable partition 16 must be larger than that of the first movable partition 15. That is, the useless space formed inside the second pressure adjusting cylinder 12 hinders downsizing of the pressure adjusting device 3.

Further, the conventional vehicle suspension system 1 has a problem that the manufacturing cost of the first and second pressure regulating cylinders 11 and 12 is increased. This is because two pressure adjusting cylinders 11 and 12 having different diameters are formed side by side in the axial direction. That is, a stepped bottomed cylindrical housing 13 is formed by casting, and the inner peripheral surface of the housing 13 (the inner peripheral surface of the cylinder) is
This is because they must be formed by machining so that the effective cross-sectional areas 1 and 12 match.

The present invention has been made in order to solve such a problem, and the size of the pressure adjusting cylinder forming the first oil chamber 14 and the second oil chamber 17 is reduced, and the manufacturing cost is reduced. The purpose is to reduce.

[0013]

In order to achieve this object, a vehicle suspension system according to the present invention is provided with a hydraulic cylinder provided so as to form a pair with a vehicle body and interposed between the vehicle body side and the wheel side. A first pressure regulating cylinder having a first oil chamber connected to an oil chamber of one of the hydraulic cylinders and having a first movable partition for changing the volume of the first oil chamber; A second oil chamber communicating with an oil chamber of the other hydraulic cylinder, and a second oil chamber interlocked with the first movable partition so that changes in the volumes of the first and second oil chambers coincide with each other. A second pressure regulating cylinder having a second movable partition for changing the volume of the chamber; a throttle interposed between a hydraulic system of the first oil chamber and a hydraulic system of the second oil chamber; And the second
And a biasing means for biasing the movable partition wall in a direction in which both oil chambers are compressed, wherein both ends of the first pressure regulating cylinder and the second pressure regulating cylinder are closed. And a rotor provided inside the housing and rotatably provided with the axis of the housing as a rotation axis, and formed between the inner peripheral surface of the housing and the rotor. The housing is provided with a pair of fixed partitions that divide the annular space into two in the circumferential direction, and the rotor is provided with a pair of movable partitions that divide each of the two divided spaces into two. A pair of spaces that are opposed to each other across the axis of the housing in the space divided into four parts in the circumferential direction between the rotor and the rotor are the first oil chamber and the second oil chamber.

According to the present invention, when the pair of hydraulic cylinders operate in the same direction, the first oil chamber and the second oil chamber are rotated by rotating the rotor together with the movable partition in the housing.
The oil chamber volume increases or decreases. When the two hydraulic cylinders operate in different directions from each other, the rotor stops so as to maintain a state where the volumes of the first oil chamber and the second oil chamber coincide with each other. From the side to the low pressure side.

Since the first oil chamber and the second oil chamber are formed between the housing and the rotor so as to be symmetrical about the axis of the housing, it is wasteful to form both oil chambers. There is no space to become. Also, the axially extending portion of the housing and the rotor, the fixed partition, and the movable partition can be formed so that the cross-sectional shape is constant from one end to the other along the axial direction of the housing. For this reason, since the pressure regulating cylinder can be formed using the member formed by drawing, the number of machining steps can be reduced as compared with a conventional apparatus in which two cylinders having different diameters are integrally formed and machined. At the same time, the processing time can be reduced.

According to a second aspect of the present invention, there is provided a vehicle suspension system according to the first aspect of the present invention, wherein a hollow portion is formed in an axial center portion of a rotor and a space in the hollow portion. Is provided in two chambers, one of the two spaces is communicated with a first oil chamber, and the other space is communicated with a second oil chamber. Is formed, and a throttle is interposed in the communication path. According to the invention,
The throttle can be provided by utilizing the dead space formed in the rotor, and piping for guiding hydraulic oil to the throttle is not required as compared with a structure in which the throttle is provided outside the housing.

According to a third aspect of the present invention, there is provided a vehicle suspension system according to the first or second aspect of the present invention, wherein the four spaces formed between the housing and the rotor are provided. The other space adjacent to the first and second oil chambers is filled with hydraulic oil, and the other space is connected to the third oil chamber having a wall formed by a free piston urged by high-pressure gas. By doing so, the urging means is configured.

According to the present invention, the rotor is urged by the pressure of the high-pressure gas in the direction in which the volumes of the first oil chamber and the second oil chamber decrease, and the hydraulic pressures of the first and second oil chambers are constantly maintained. Since the positive pressure is maintained, cavitation can be prevented from occurring. Since the entire space formed between the housing and the rotor has a structure filled with oil, the other two spaces other than the first and second oil chambers are used as high-pressure gas chambers for the first and second oil chambers. As compared with the structure in which the rotor is urged by the pressure of the high-pressure gas in the direction in which the volume of the second oil chamber decreases, the rotor passes through the gap between the fixed partition and the rotor and the gap between the movable partition and the housing. Gas can be prevented from entering the first and second oil chambers.

According to a fourth aspect of the present invention, there is provided a vehicle suspension system according to the third aspect of the present invention, wherein the hydraulic oil communicated with the hydraulic cylinders in the first and second oil chambers. When the hydraulic oil flows out of the first and second oil chambers due to the expansion and contraction of the hydraulic cylinder between the doorway and the hydraulic oil inlet / outlet communicated with the third oil chamber in another space; A spring member is provided that positions the movable partition at a position where the hydraulic oil port is not closed both when the hydraulic oil flows into both oil chambers.
According to the present invention, the hydraulic oil passes through the minute gap between the fixed partition and the rotor or between the movable partition and the housing, and the first oil flows through the first gap.
Alternatively, even if the rotor leaks from the second oil chamber, the rotor is held by the spring member at a position where the effective rotation angle is maximized. Further, as a sealing member for sealing between the fixed partition and the rotor or between the movable partition and the housing, a sealing member having a relatively small pressing force at the sliding contact portion can be used.

According to a fifth aspect of the present invention, there is provided a vehicle suspension according to the first or second aspect of the invention, wherein the four spaces formed between the housing and the rotor are provided. Among them, the urging means is constituted by filling the other space adjacent to the first and second oil chambers with high-pressure gas.

According to the present invention, the rotor is urged by the pressure of the high-pressure gas in the direction in which the volumes of the first oil chamber and the second oil chamber decrease, and the hydraulic pressures of the first and second oil chambers are constantly maintained. Since the positive pressure is maintained, cavitation can be prevented from occurring. Since the pressure of the high-pressure gas is directly applied to the fixed partition and the movable partition, the number of parts can be reduced as compared with a structure in which the pressure of the high-pressure gas acts via the hydraulic oil.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle suspension system according to the present invention will be described below in detail with reference to FIGS. 1 is a configuration diagram of a vehicle suspension system according to the present invention, FIG. 2 is a longitudinal sectional view of a pressure regulator, and FIG. 3 is a sectional view of a housing and a rotor of the pressure regulator. In FIG. 3, the broken position in FIG.
-Indicated by line II. In these drawings, the same or equivalent members as those described with reference to FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In these figures, the reference numeral 31 indicates a vehicle suspension system according to the present invention. The suspension device 31 includes a pair of hydraulic shock absorbers 2, 2 provided on a vehicle body (not shown), and a lower oil chamber 7 of the hydraulic shock absorber 2.
And a pressure adjusting device 32 connected to the control unit. The hydraulic shock absorber 2 constitutes a hydraulic cylinder according to the present invention.

As shown in FIG. 1, a pressure regulating device 32 according to this embodiment has a cylindrical housing 33 having both ends closed, and an axis of the housing 33 inside the housing 33 (in FIGS. 1 and 3). A first pressure regulating cylinder and a second pressure regulating cylinder are constituted by a rotor 34 which is rotatably provided with a point C and a one-dot chain line C in FIG. The housing 33 is formed integrally with a pair of fixed partition walls 35 that divide a space having an annular cross section between the inner peripheral surface of the housing 33 and the outer peripheral surface of the rotor 34 into two in the circumferential direction. The rotor 34 is integrally formed with a pair of movable partition walls 36 that divide each of the two divided spaces into two.

The housing 1 is formed by the partition walls 35 and 36.
Among a space divided into four in the circumferential direction between the rotor 3 and the rotor 34, a pair of spaces opposed to each other with the axis C of the housing 33 interposed therebetween are defined as a first oil chamber 14 and a second oil chamber 17,
The first oil chamber 14 is connected to the lower oil chamber 7 of the hydraulic shock absorber 2 on the left side of the vehicle body, and the second oil chamber 17 is connected to the lower oil chamber 7 of the hydraulic shock absorber 2 on the right side of the vehicle body.

The pressure adjusting device 32 is provided in the first oil chamber 1.
A restrictor 18 is interposed between the hydraulic system connected to the fourth oil chamber 4 and the hydraulic system connected to the second oil chamber 17. Further, of the four divided spaces, the other two spaces adjacent to the first and second oil chambers 17 (hereinafter, these spaces are referred to as auxiliary oil chambers 37) are filled with hydraulic oil, and these auxiliary spaces are filled. The oil chambers 37 are connected to the accumulators 38, respectively. The accumulator 38 defines a high-pressure gas chamber 38a and a third oil chamber 38b by a free piston 40 in a cylinder 39, fills the high-pressure gas chamber 38a with the high-pressure gas, and operates the third oil chamber 38b. Filled with oil. This third oil chamber 3
8b is connected to the two auxiliary oil chambers 37, 37 described above. In the pressure adjusting device 32 according to this embodiment, the accumulator 38 and the sub oil chamber 37 constitute urging means.

In order to mount the pressure regulating device 32 constructed as described above on, for example, the body of an automobile, each member is formed as shown in FIGS. 2 and 3, the pressure adjusting device 32 has a rotor 33 rotatably provided inside a housing 33 and an accumulator 38 integrally provided at one end of the housing 33 in the axial direction.

The housing 33 includes a cylinder 41 forming an outer wall of the first and second oil chambers 14 and 17 and an auxiliary oil chamber 37,
It is formed by first and second lids 43 and 44 fixed to both ends of the cylinder 41 with fixing bolts 42 (see FIG. 3). As shown in FIG. 3, the cylinder 41 has two fixed partition walls 35 integrally formed on an inner peripheral portion thereof. These fixed partition walls 35 are formed in a plate shape extending along the axis C of the housing 33 from one end of the housing 33 to the other end. The positions where these fixed partition walls 35 are formed are set at positions where the space between the housing 33 and the rotor 34 is divided into two in the circumferential direction, in other words, at positions where the space is symmetrical about the axis C of the housing 33. . In this embodiment, the cylinder 41 and the fixed partition 35 are formed by drawing. Further, a seal member 45 is attached to the ends of the two fixed partition walls 35 facing the rotor 34 in order to prevent the hydraulic oil from leaking from a gap between the rotor 34 and the fixed member 35.

The first and second lids 43 and 44 are
The cylinder 41 and the rotor 3 are located between the lids 43 and 44.
The cylinder 41 is clamped and held by tightening the fixing bolt 42 while sandwiching the
Is rotatably supported. The fixing bolt 42 has bosses 41a protruding at four locations on the outer peripheral portion of the cylinder 41, and bosses protrudingly provided on the outer peripheral portions of the first and second lids 43 and 44 so as to face the boss 41a. (Not shown), and by tightening these bosses, the first and second lids 43 and 44 are attached to the cylinder 41.
It is fixed to. Also, the first and second lids 43, 4
A seal member 46 is interposed between the cylinder 4 and the cylinder 41 to prevent the hydraulic oil from leaking out of the pressure regulator 32.

The rotor 34 is formed by a rotor main body 51 formed in a cylindrical shape with a bottom and a disk-shaped lid 52 for closing an opening of the rotor main body 51. Two movable partition walls 36 are integrally formed on the outer peripheral portion of the rotor main body 51 so as to extend from one end of the rotor main body 51 to the other end thereof along the axis of the rotor 34, and a columnar support is provided on the axial center of the bottom of the rotor main body. The shaft 53 is formed integrally. The movable partition 36 is disposed at a position symmetrical with respect to the axis of the rotor main body 51, and the space in the housing divided into two by the fixed partition 35 is divided into two, and the four volumes are equal to each other. The space is provided so as to be formed between the housing 33 and the rotor 34.

The movable partition 36 has a seal member 54 attached to an end of the movable partition 36 facing the housing 33 and the first and second lids 43 and 44. This seal member 54 integrally forms a portion that contacts the first lid 43, a portion that contacts the cylinder 41, and a portion that contacts the second lid 44, and has a U-shaped outer shape. It has become. The support shaft 53 is rotatably supported by a circular recess 43 a formed in the first lid 43 via a slide bearing 55.

A torsion spring 56 for urging the rotor 34 to a neutral position is interposed between the support shaft 53 and the first lid 43. This torsion spring 56
Constitute a spring member according to the present invention. In the present embodiment, the neutral position is, as shown in FIG. 3, a virtual line L1 connecting the two movable partitions 36, 36 and a virtual line L2 connecting the two fixed partitions 35, 35. Are orthogonal positions. The lid 52 of the rotor 34 has a support shaft 57 integrally formed at the shaft center and is screwed to an opening of the rotor body 51. The support shaft 57 is connected to the second lid 44.
Is rotatably supported via a slide bearing 58 in a circular concave portion 44a formed in the above.

By disposing the rotor 34 thus configured in the housing 33, the first and second oil chambers 14 and 17 and the two auxiliary oil chambers adjacent to these two oil chambers are provided in the housing 33. 37, 37 are formed. The first oil chamber 14 is provided with a first pipe joint 5 attached to the first lid 43.
9 and a hydraulic pipe (not shown) connected to the first pipe joint 59 to the hydraulic shock absorber 2 on the left side of the vehicle body,
The second oil chamber 17 is connected to a second pipe joint 60 attached to the first lid 43 and a hydraulic pipe (not shown) connected to the second pipe joint 60, so that the hydraulic pressure on the right side of the vehicle body can be increased. It is connected to the shock absorber 2. In addition, the first and second oil chambers 1
4 and 17 are communicated with each other via a throttle 18 described later provided in the rotor 34. Further, the auxiliary oil chambers 37, 3
Reference numeral 7 is connected to an oil chamber of the actuator 38 described later via a communication hole 61 formed in the second lid 44.

In the interior of the rotor 34, that is, in the hollow portion of the rotor 34 surrounded by the rotor body 51 and the lid 52, a partition member 62 for defining the hollow portion in two chambers in the axial direction of the rotor 34 is provided. Provided. A space located on the left side in FIG. 2 among the two chambers is communicated with the first oil chamber 14 through a first communication hole 51a of the rotor main body 51,
The other space communicates with the second oil chamber 17 via the second communication hole 51b of the rotor main body 51. The space located on the left side is hereinafter referred to as a first communication chamber 63, and the other space is hereinafter referred to as a second communication chamber 64.

The partition member 62 includes the first and second members.
A first and second communication passages 65 and 66 for communicating the communication chambers 63 and 64 with each other are formed, and a disc-shaped opening and closing an opening of the first communication passage 65 on the side of the first communication chamber 63 is formed. A first spring plate 67 and a disk-shaped second spring plate 68 for opening and closing an opening of the second communication passage 66 on the side of the second communication chamber 64. ,
68 together with the fixing bolt 69
It is fixed to the bottom.

The first communication passage 65 and the first spring plate 67 are
A check valve that allows the hydraulic oil to flow only from the second communication chamber 64 to the first communication chamber 63 is formed. The second communication passage 66 and the second spring plate 68 are connected to the second communication chamber 63 from the first communication chamber 63 to the second communication chamber 63. A check valve for flowing hydraulic oil only to the communication chamber 64. The first and second spring plates 67 and 68 constitute the aperture 18.

The accumulator 38 is connected to the second lid 4
4 is formed by using an end opposite to the cylinder 41, and a cylinder 39 formed by screwing one end to a cylinder 44b protruding from the second lid body 44; A lid 39a for closing the other end of the cylinder 39;
Free piston 4 which is fitted inside so as to be movable in the axial direction
0. This free piston 40
Is formed in a cylindrical shape with a bottom in this embodiment, and a third oil chamber 38b located inside the cylinder 39 on the side of the second lid 44.
And a high-pressure gas chamber 38a located on the opposite side. The outer periphery of the free piston 40 has a cylinder 3
Annular sealing member 40 for sealing between
a, 40b. The communication hole 61 is opened in the third oil chamber 38b, and the hydraulic oil in the third oil chamber 38b and the hydraulic oil in the two sub oil chambers 37 communicate with each other.
Through the Internet. High pressure gas chamber 38a
Is filled with high-pressure gas. Further, a rubber stopper member 71 for piercing a needle member (not shown) when the high-pressure gas chamber 38a is filled with a high-pressure gas is attached to the lid 39a.

In the vehicle suspension system 31 provided with the pressure adjusting device 32 configured as described above, for example, when the hydraulic shock absorber 2 on the left side of the vehicle body is compressed and the hydraulic shock absorber 2 on the right side of the vehicle body is extended, That is, when the vehicle turns right,
Hydraulic oil flows out of the hydraulic shock absorber 2 on the left side of the vehicle body and the oil pressure in the first oil chamber 14 of the pressure regulating device 32 rises. , The oil pressure in the oil chamber 17 decreases.

At this time, since the rotor 34 is stopped so as to maintain the state where the volumes of the first and second oil chambers 14 and 17 coincide with each other, the pressure increase in the first oil chamber 14 and the second
Hydraulic oil flows from the first oil chamber 14 to the second oil chamber 17 via the throttle 18 so as to offset the pressure drop in the oil chamber 17. In the pressure regulator 32 shown in FIGS. 2 and 3, at this time, the first oil chamber 14 → the first communication hole 51a
Hydraulic oil flows through a hydraulic system consisting of → first communication chamber 63 → second communication passage 66 → second communication chamber 64 → second communication hole 51 b → second oil chamber 17.

When the vehicle makes a left turn, the second oil chamber 17 → the second communication hole 51b → the first communication passage 65 → the first communication chamber 63 → the first communication hole 51a → the first communication hole. Hydraulic oil flows through a hydraulic system composed of oil chambers 14. In this way, the hydraulic oil
By causing the spring plates 67 and 68 to elastically deform when flowing between the oil chamber 14 and the second oil chamber 17, a damping force is generated. That is, when the two hydraulic shock absorbers 2 operate in directions different from each other, a damping force generated when hydraulic oil passes through the throttles 8 of the respective hydraulic shock absorbers 2,
The damping force generated when the hydraulic oil passes through the throttle 18 of the pressure adjusting device 32 acts.

On the other hand, when the hydraulic shock absorber 2 on the left side of the vehicle body and the hydraulic shock absorber 2 on the right side of the vehicle body are compressed with each other at the time of pitching or bouncing, the hydraulic oil is supplied to the first and second oil chambers 14. , 17 and the rotor 34 of the pressure regulating device 32 rotates together with the movable partition 36 against the elastic force of the torsion spring 56 in the direction in which the volumes of these two oil chambers increase. At this time, the rotor 34 rotates counterclockwise in FIG. 1, and the rotor 34 rotates clockwise in FIG. When both hydraulic shock absorbers 2 extend from each other, the rotor 34
Turns around in the opposite direction.

When the two hydraulic shock absorbers 2 operate in the same direction as described above, the volume of the first and second oil chambers 14 and 17 increases and decreases as the rotor 34 rotates. The amount of hydraulic oil passing through the throttle 18 is reduced, and the damping force generated by the pressure regulator 32 is reduced. When the rotor 34 rotates in the direction in which the volumes of the first and second oil chambers 14 and 17 increase, hydraulic oil flows from the auxiliary oil chamber 37 through the communication hole 61 into the third oil chamber 38 b of the accumulator 38. When the rotor 34 rotates in a direction in which the volumes of the first and second oil chambers 14 and 17 decrease, hydraulic oil flows from the third oil chamber 38 b of the accumulator 38 through the communication hole 61. Then, it flows into the sub oil chamber 37.

Accordingly, the pressure adjusting device 32 of the vehicle suspension device 31 having the above-described structure includes the first oil chamber 14 and the second oil chamber 17 between the housing 33 and the rotor 34. Since the two oil chambers 14 and 17 are formed so as to be symmetrical about the center C, it is possible to prevent a wasteful space from being generated due to the formation of the oil chambers 14 and 17. Further, the axially extending portion of the housing 33 (the cylinder 4
1) The fixed partition 35, the rotor body 51 and the movable partition 36 can be formed so that the cross-sectional shape is constant from one end to the other along the axial direction of the housing 33. For this reason, since the pressure regulating cylinder can be formed using the member formed by drawing, the number of machining steps can be reduced as compared with a conventional apparatus in which two cylinders having different diameters are integrally formed and machined. At the same time, the processing time can be reduced.

Further, a torsion spring 5 for urging the rotor 34 to a neutral position between the rotor 34 and the first lid 43 is provided.
6, the hydraulic oil passes from the first or second oil chambers 14 and 17 through a minute gap between the fixed partition 35 and the rotor 34 and between the movable partition 36 and the housing 33. Even if it leaks, the rotor 34 is returned to the neutral position by the elastic force of the torsion spring 56. For this reason, the effective rotation angle of the rotor 34 can be maintained at the maximum. The position at which the rotor 34 is stopped by the torsion spring 56 can be appropriately changed as long as the position satisfies the following conditions. That is, the movable partition wall 36 is connected to the hydraulic oil ports 14 a and 17 a communicating with the hydraulic cylinder 2 in the first and second oil chambers 14 and 17, and to the third oil chamber 38 b in the sub oil chamber 37. When the hydraulic cylinder 2 expands and contracts and hydraulic oil flows out of the first and second oil chambers 14 and 17 between the hydraulic oil inlet and outlet 37a (see FIG. 3), 17 when the hydraulic oil flows into the hydraulic oil inlet / outlet 14.
The movable partition 36 is located at a position where the a and 17a are not closed.
To be positioned. More specifically, the position of the movable partition 36 is such that the movable partition 36 does not block the hydraulic oil ports 14a and 17a when the hydraulic cylinders 2 and 2 extend to the maximum, When the valve is contracted to the maximum, the movable partition 36 is moved to the hydraulic oil port 37.
a, 37a are set at positions where they will not be blocked.

As shown in this embodiment, the housing 33 is filled with hydraulic oil, and the rotor 34 is held at a fixed position by the torsion spring 56. Between the movable partition 36 and the housing 33.
Can be used as the sealing member 54 interposed therebetween. For this reason, a simple and inexpensive seal member 45, 54 can be used, and the resistance when the rotor 34 rotates can be reduced to improve the operability.

The partition member 62 is provided in the hollow portion of the rotor 34, and the throttle member 18 provided between the first oil chamber 14 and the second oil chamber 17 is provided in the partition member 62. The aperture 18 can be provided by utilizing the dead space in the area 34. Moreover, compared to a structure in which the throttle 18 is provided outside the housing 33, a pipe for guiding the hydraulic oil to the throttle 18 is not required.

Further, since the auxiliary oil chamber 37 is connected to the third oil chamber 38b of the accumulator 38, the rotor 34 is moved in the direction in which the volumes of the first oil chamber 14 and the second oil chamber 17 decrease. Energized by the pressure of the high-pressure gas, the hydraulic pressure of the first and second oil chambers 14 and 17 is always maintained at a positive pressure. For this reason, it is possible to prevent the occurrence of cavitation and to prevent the damping force from changing with the change in the volume of the bubbles in the hydraulic oil. Instead of providing the accumulator 38, a structure in which the rotor 34 is mechanically urged in a direction in which the oil chambers 14 and 17 are compressed by a spring member or the like may be adopted. When this structure is adopted, the sub oil chamber 37 is formed so that air can flow. In the structure using the accumulator 38, the entire space formed between the housing 33 and the rotor 34 is filled with oil. Therefore, as described above, the rotor 34 is mechanically urged by using the sub oil chamber 37 as an air chamber. As compared with the structure described above, air enters the first and second oil chambers 14 and 17 through the gap between the fixed partition 35 and the rotor 34 and the gap between the movable partition 36 and the housing 33. Can be prevented.

Further, the accumulator 38 is formed by fitting a cylindrical free piston 40 having a bottom into a cylindrical cylinder 39.
The seal members 40a and 40b to be mounted on the first and second annular members having high sealing properties can be used.
The gas can be reliably prevented from entering the oil chambers 14 and 17) with a simple structure.

As the urging means for urging the first and second oil chambers 14 and 17 in the compression direction, the oil chamber of the accumulator 38 is connected to the auxiliary oil chamber 37 as shown in this embodiment.
In addition to the above structure, the two sub oil chambers 37 in the housing 33 may have a sealed structure, and the sub oil chamber 37 may be filled with a high-pressure gas.

By adopting this structure, the rotor 34 is urged by the pressure of the high-pressure gas in the direction in which the volumes of the first oil chamber 14 and the second oil chamber 17 are reduced, and the first and second oil chambers are urged. Since the hydraulic pressure in the chambers 14 and 17 is always maintained at a positive pressure, it is possible to prevent cavitation from occurring. In particular, by adopting this structure, the fixed partition 35
Since the pressure of the high-pressure gas is directly applied to the movable partition 36 and the movable partition 36, the number of parts can be reduced as compared with a structure using the accumulator 38 (a structure in which the pressure of the high-pressure gas is applied via hydraulic oil).

In the above-described embodiment, an example is shown in which the first and second oil chambers 14 and 17 are connected to the hydraulic shock absorber 2 on the left side of the vehicle body and the hydraulic shock absorber 2 on the right side of the vehicle body. The hydraulic shock absorber 2 connecting the oil chambers 14 and 17 may be arranged at any position as long as it is provided so as to form a pair with the vehicle body. In addition, a hydraulic cylinder may be provided for each wheel separately from the hydraulic shock absorber, and the first and second oil chambers 14 and 17 may be connected to the oil chamber of the hydraulic cylinder instead of the hydraulic shock absorber. Further, the accumulator 38
Besides being formed by the cylinder 39 and the free piston 40, it can be formed by a bladder filled with hydraulic oil, and a pressure vessel accommodating the bladder. When this structure is adopted, a high-pressure gas is filled between the pressure vessel and the bladder.

[0052]

As described above, according to the present invention, the first oil chamber and the second oil chamber of the pressure adjusting cylinder are symmetrical about the axis of the housing between the housing and the rotor. Since there is no space wasted in forming these two oil chambers, the size of the pressure regulating cylinder can be reduced. In addition, since the pressure regulating cylinder can be formed by using a member formed by drawing, compared to a conventional apparatus in which two cylinders having different diameters are integrally formed and machined, the man-hour for machining is reduced. In addition to the reduction, the processing time can be shortened. For this reason, a vehicle suspension system can be realized at a lower manufacturing cost than in the related art.

According to the second aspect of the present invention, the throttle can be disposed by utilizing the dead space in the rotor, and the pipe for guiding the hydraulic oil to the throttle as compared with the structure in which the throttle is provided outside the housing. Is unnecessary, and a compact vehicle suspension device can be realized.

According to the third aspect of the present invention, the urging means is configured so that the entire area of the space formed between the housing and the rotor is filled with oil.
The other two spaces apart from the oil chamber of
And a gap between the fixed partition and the rotor and a gap between the movable partition and the housing, as compared to a structure in which the rotor is biased by the pressure of the high-pressure gas in a direction in which the volume of the second oil chamber decreases. As a result, the gas can be prevented from entering the first and second oil chambers, and a damping force corresponding to the behavior of the vehicle body can be generated with good responsiveness.

According to the fourth aspect of the present invention, it is assumed that the hydraulic oil leaks from the first or second oil chamber through a minute gap between the fixed partition and the rotor or between the movable partition and the housing. However, since the rotor is held by the spring member at the position where the effective rotation angle is maximized, the performance at the beginning of use can be maintained for a long time. Further, as a sealing member for sealing between the fixed partition and the rotor or between the movable partition and the housing, a sealing member having a relatively small pressing force at the sliding contact portion can be used. Therefore, an inexpensive seal member can be used, and the resistance when the rotor rotates can be reduced to improve the operability.

According to the fifth aspect of the present invention, since the urging means is configured so that the pressure of the high-pressure gas is directly applied to the fixed partition and the movable partition, a structure in which the pressure of the high-pressure gas is applied via the hydraulic oil. , The number of parts can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle suspension device according to the present invention.

FIG. 2 is a longitudinal sectional view of the pressure adjusting device.

FIG. 3 is a sectional view of a housing and a rotor of the pressure adjusting device.

FIG. 4 is a cross-sectional view illustrating a configuration of a conventional vehicle suspension device.

[Explanation of symbols]

2 ... Hydraulic shock absorber, 7 ... Lower oil chamber, 14 ... First oil chamber,
17 ... second oil chamber, 18 ... throttle, 31 ... vehicle suspension, 32 ... pressure regulator, 33 ... housing, 34 ... rotor, 35 ... fixed partition, 36 ... movable partition, 37 ... sub oil chamber,
38 accumulator, 38b third oil chamber, 40 free piston, 56 torsion spring, 62 partition member, 63 first communication chamber, 64 second communication chamber, 65
First communication path, 66... Second communication path.

Claims (5)

[Claims] 1. A hydraulic cylinder provided to form a pair with a vehicle body by connecting a cylinder to one of the vehicle body side and the wheel side and connecting a piston to the other, and an oil chamber of one of the hydraulic cylinders A first pressure regulating cylinder having a first oil chamber that communicates with the first oil pressure chamber and a first movable partition that changes the volume of the oil chamber; and a second oil chamber that communicates with the oil chamber of the other hydraulic cylinder. And a second control having a second movable partition that changes the volume of the second oil chamber in conjunction with the first movable partition so that the volume changes of the first and second oil chambers match. A pressure cylinder, a throttle interposed between a hydraulic system of the first oil chamber and a hydraulic system of the second oil chamber,
And a biasing means for biasing the second movable partition in a direction in which both oil chambers are compressed, wherein the first pressure regulating cylinder and the second pressure regulating cylinder are It is formed by a cylindrical housing having both ends closed, and a rotor rotatably provided inside the housing with the axis of the housing as a rotation axis, between the inner peripheral surface of the housing and the rotor. The housing is provided with a pair of fixed partition walls that divide the formed annular space into two in the circumferential direction, and the rotor is provided with a pair of movable partition walls that divide each of the two divided spaces into two. A pair of spaces opposing each other across the axis of the housing among the four spaces circumferentially divided between the housing and the rotor by the first oil chamber and the second oil chamber. car Use the suspension system. 2. The vehicle suspension system according to claim 1, wherein a hollow portion is formed in an axial center portion of the rotor, and a partition member for dividing a space in the hollow portion into two chambers is provided. One space is communicated with the first oil chamber, the other space is communicated with the second oil chamber, and the partition member is provided with a communication passage communicating the two spaces with each other. A suspension device for a vehicle, wherein a throttle is interposed. 3. The vehicle suspension according to claim 1, wherein the four spaces formed between the housing and the rotor are adjacent to the first and second oil chambers. The space is filled with hydraulic oil, and the urging means is constituted by connecting the other space to a third oil chamber in which a free piston urged by a high-pressure gas constitutes a wall surface. Suspension system for vehicles. 4. The suspension system for a vehicle according to claim 3, wherein a hydraulic oil port in the first and second oil chambers communicates with a hydraulic cylinder and a third port in the other space.
Between the first and second oil chambers due to the expansion and contraction of the hydraulic cylinder between the first and second oil chambers between the first and second oil chambers between the first and second hydraulic chambers. A vehicle suspension device comprising a spring member for positioning a movable partition at a position where the hydraulic oil port is not closed at both times. 5. The vehicle suspension according to claim 1, wherein the four spaces formed between the housing and the rotor are adjacent to the first and second oil chambers. A suspension device for a vehicle, characterized in that the urging means is constituted by filling a high-pressure gas into the space.