JP2002240530A - Suspension device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve ride comfort and running stability by suppressing micro vibration, rolling, pitching occurring in a vehicle, and to improve workability of assembling work and changeover work. SOLUTION: An upper side chamber D of a first air spring 12 positioned on the left side is connected to a lower air chamber E' of a second air spring 12' positioned on the right side through a supply air pressure supply/discharge pipe 19. An upper air chamber D' of the second air spring 12' is connected to a lower air chamber E of the first air spring 12 through a supply air pressure supply/discharge pipe 20. Thus, on cornering to right, air pressure in the upper air chamber D of the first air spring 12 positioned outside is supplied to the lower air chamber E' of the second air spring 12' positioned inside through the supply/discharge pipe 19, thereby suppressing extension of a second hydraulic shock absorber 2'. The supply/discharge pipes 19 and 20 can be easily connected because failure by mixing of air does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle suspension system suitable for use as a suspension system for vehicles such as four-wheeled vehicles and two-wheeled vehicles.

[0002]

2. Description of the Related Art Generally, a vehicle such as a four-wheeled vehicle includes a suspension for suspending a vehicle body on wheels. The suspension includes a shock absorber for damping vibrations and a spring member for urging the shock absorber in an extending direction. And is constituted by. Also, the shock absorber is, for example, a cylinder attached to the wheel side, a piston which defines two upper and lower chambers in the cylinder, a lower end side is attached to the piston in the cylinder, and an upper end side extends and contracts from the cylinder. It protrudes displaceably, and its protruding end is substantially constituted by a piston rod attached to the vehicle body side.

[0003] As a shock absorber, there is known a hydraulic shock absorber in which an oil solution is sealed in a cylinder and a piston is provided with a valve for giving a flow resistance to the oil solution. As the spring means, a coil spring, an air spring, or the like is used.

[0004] When the suspension is mounted on the vehicle, the vibration is suppressed in a short time during traveling to improve the riding comfort. In addition, left and right vibrations (rolling) that occur when the vehicle corners, It is necessary to improve the running stability by suppressing vibrations (pitching) in the front and rear directions that occur when the vehicle accelerates and decelerates.

[0005] A vehicle suspension device capable of improving running stability by suppressing rolling and pitching of the vehicle is known, for example, from Japanese Utility Model Publication No. 47-29914.

In the vehicle suspension device according to the prior art, a pair of suspensions are prepared. For example, when rolling is suppressed, the paired suspensions are disposed on the left and right sides of the vehicle. The upper oil chamber of the left hydraulic shock absorber and the lower oil chamber of the right hydraulic shock absorber are connected by piping, and the upper oil chamber of the right hydraulic shock absorber and the lower oil chamber of the left hydraulic shock absorber are connected to each other. Are connected by piping.

As a result, when the vehicle corners, the suspension located on the outer side tends to contract and the suspension located on the inner side tends to extend. But,
When the piston rod of the outer hydraulic shock absorber contracts, the pressure in the lower oil chamber increases, and this pressure acts on the upper oil chamber of the inner hydraulic shock absorber via a pipe. As a result,
Since the elongating operation of the piston rod of the inner hydraulic shock absorber is suppressed, rolling during cornering is suppressed.
In addition, by arranging a pair of suspensions in front and rear, pitching that occurs when the vehicle accelerates and decelerates can be suppressed.

[0008]

In the above-described vehicle suspension apparatus according to the prior art, the upper oil chamber of one hydraulic shock absorber and the lower oil chamber of the other hydraulic shock absorber are connected by a pipe. The upper oil chamber of the hydraulic shock absorber and the lower oil chamber of one hydraulic shock absorber are connected by piping. But,
Since the piping connecting each hydraulic shock absorber is long due to the structure of the vehicle, a pressure loss occurs when incompressible oil liquid flows, and the resistance at this time increases the damping force more than necessary, There is a problem that the ride quality deteriorates.

Further, if air enters the pipes connecting the oil chambers of the respective hydraulic shock absorbers, the performance will be degraded. Therefore, air will not enter the pipes or the like when assembling or replacing the suspension device. As described above, the work must be performed carefully, and there is a problem that the workability is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to suppress the minute vibration (high-frequency vibration), rolling, and pitching that occur in a vehicle, thereby improving ride comfort and running stability. It is an object of the present invention to provide a vehicle suspension device capable of improving the vehicle suspension.

Another object of the present invention is to provide a suspension apparatus for a vehicle which facilitates the work of assembling and replacing a suspension, thereby improving the workability.

[0012]

SUMMARY OF THE INVENTION A suspension system for a vehicle according to the present invention comprises a shock absorber for damping the vibration of a vehicle by a piston rod extending and contracting from a cylinder, and a shock absorber between the cylinder and the piston rod of the shock absorber. An air spring having an air chamber provided to urge the piston rod in the extension direction.

[0013] In order to solve the above-mentioned problems,
A feature of the configuration adopted by the invention of claim 1 is that the air spring is provided with a partition member fixed to the cylinder side to define the air chamber into two chambers, and the two members defined by the partition member are provided. The configuration is such that the air pressure is individually supplied and exhausted from the outside to each of the chambers.

With this configuration, for example, a pair of vehicle suspension devices are provided, and when each piston rod is contracted, a chamber compressed in one air spring and a chamber expanded in the other air spring. And a chamber that is compressed in the other air spring and a chamber that expands in the one air spring are connected. Accordingly, when the paired suspension devices are disposed on the left and right sides of the vehicle, when the vehicle corners, the piston rod of the shock absorber located outside contracts and the piston rod of the shock absorber located inside extends. try to. However, at this time, since the air pressure of the chamber compressed by the outer air spring acts on the chamber to be reduced by the inner air spring, the piston rod of the inner shock absorber is prevented from being extended and displaced. Rolling can be suppressed. In addition, when the pair of suspension devices are disposed before and after, the pitching of the vehicle can be suppressed.

Further, since the air flowing between the chambers is compressible, the air can be compressed and expanded to absorb minute vibrations.

A vehicle suspension device according to the present invention comprises a first and a second shock absorber for damping the vibration of a vehicle by a piston rod extending and contracting from a cylinder, and a cylinder and a piston of the first and second shock absorbers. The first and second air springs are provided between the first and second rods and have air chambers for urging the piston rod in the extension direction.

Then, in order to solve the above-mentioned problem,
The second aspect of the invention is characterized in that the first and second air springs are provided with air pressure supply / discharge pipes for supplying / discharging the air pressure in the air chamber to a counterpart buffer or the air chamber side. The air pressure supply / discharge pipe is configured such that when one of the piston rods of the first and second shock absorbers is contracted and displaced, the piston rod of the other damper is prevented from being extended and displaced. is there.

With this configuration, for example, when rolling is suppressed when the vehicle corners, the first shock absorber and the first air spring are disposed on the left side of the vehicle, and the second shock absorber is provided. The vessel and the second air spring are located on the right side of the vehicle. As a result, when the vehicle corners to the right, the piston rod of the left shock absorber located outside contracts, and the piston rod of the right shock absorber located inside tries to extend. However, at this time, the air pressure supply / discharge pipe supplies / discharges the air pressure in the left air spring to the other right buffer or the air chamber side so as to suppress the piston rod of the right buffer from being extended and displaced. Acts on
Rolling of the vehicle can be suppressed. Also, the first
The shock absorber and the first air spring are disposed on the front side of the vehicle.
By arranging the shock absorber and the second air spring on the rear side of the vehicle, pitching of the vehicle can be suppressed.

Furthermore, since the air flowing through the air pressure supply / discharge pipe is compressible, the air can be compressed and expanded to absorb minute vibrations.

On the other hand, the air pressure supply / discharge pipe provided between the air chamber and the other shock absorber or air chamber is used to allow air to flow therethrough. , The air pressure supply / discharge pipe can be easily connected.

According to a third aspect of the present invention, the shock absorber has a structure in which air is accommodated in a cylinder and a damping force is generated by the flow resistance of the air.

With this configuration, when the piston rod of the shock absorber expands and contracts, a flow resistance is given to the flowing air, and a damping force is generated by the flow resistance, thereby suppressing vibration.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vehicle suspension device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the suspension device is mounted on a vehicle such as a four-wheeled vehicle. In the embodiment, a case where first and second air suspensions are provided on the left and right sides of the vehicle will be described as an example.

Further, since the first and second air suspensions have the same configuration, the components of the first air suspension will be specifically described, and the second air suspension will be described with reference to the first air suspension. A dash “′” is added to the reference numeral of the suspension, and the description thereof will be omitted.

First, FIGS. 1 and 2 show a first embodiment of the present invention. Reference numeral 1 denotes a first air suspension mounted on the left side of a vehicle (not shown). The air suspension 1 is generally constituted by a first hydraulic shock absorber 2 and a first air spring 12, which will be described later.

Reference numeral 2 denotes a first air suspension 1, which is a first hydraulic shock absorber for damping the vibration of the vehicle. The hydraulic shock absorber 2 is roughly constituted by a cylinder 3, a piston 7, a piston rod 10 and the like which will be described later. It is configured.

Reference numeral 3 denotes a cylindrical cylinder which forms an outer shell of the first hydraulic shock absorber 2. The upper side of the cylinder 3 is closed by an upper cap 4 also serving as a rod guide, and the lower side is closed by a bottom cap 5. Have been. An annular seal 6 is provided on the inner peripheral side of the upper cap 4 to seal the space between the upper cap 4 and a piston rod 10 described later in a gas-liquid tight manner. Further, below the bottom cap 5, a mounting eye 5A for mounting the cylinder 3 to a wheel side (not shown) of the vehicle is provided.

Reference numeral 7 denotes a piston slidably inserted into the cylinder 3. The piston 7 defines the cylinder 3 into an upper rod-side oil chamber A and a lower bottom-side oil chamber B. ing. The piston 7 has a piston rod 10 to be described later.
A damping force valve 8 that generates a damping force when is extended;
A damping force valve 9 for flowing the oil liquid when the piston rod 10 is contracted is provided. The damping force valves 8 and 9 are opened when the piston rod 10 is extended and contracted, respectively, so that the rod-side oil chamber A and the bottom-side oil chamber B are opened.
A damping force is generated by allowing the oil liquid to flow between the first and second fluids.

Reference numeral 10 denotes a piston rod inserted into the cylinder 3, and the lower end of the piston rod 10 is attached to the piston 7. The upper end of the piston rod 10 projects outside the cylinder 3 via the upper cap 4 and the like, and is attached to the vehicle body side (not shown) of the vehicle.

A free piston 11 is located below the piston 7 and is slidably inserted into the cylinder 3. The free piston 11 has a gas chamber C in the cylinder 3 between the free piston 11 and the bottom cap 5. A pressurized gas is sealed in the gas chamber C. When the piston rod 10 expands and contracts, the free piston 11 slides up and down in the cylinder 3 to expand and contract the gas chamber C, so that the piston rod 10 moves into the cylinder 3. It allows the volume to increase or decrease when entering.

Next, reference numeral 12 denotes a first air spring provided on the outer peripheral side of the piston rod 10. The air spring 12 has a closed cylindrical shell 13 attached to the protruding end side of the piston rod 10. It is substantially constituted by a flexible cylindrical rubber 14 which keeps the space between the lower end of the shell 13 and the outer periphery of the cylinder 3 airtight and allows relative movement between the shell 13 and the cylinder 3.

Reference numeral 15 denotes a disk-shaped partition member.
Reference numeral 5 is inserted into the outer peripheral side of the piston rod 10 and fixed to the upper end surface of the cylinder 3 by means of, for example, screwing or welding. Then, the partition member 15 fills a space (air chamber) surrounded by the shell 13 and the rubber 14 with the upper air chamber D.
And a lower air chamber E. Also, the partition member 15
As shown in FIG. 2, a U-shaped peripheral groove 15A into which a rubber ring 16 is fitted is formed on the outer peripheral side of the outer peripheral surface of the rim.

Numeral 16 denotes a rubber ring which is located on the outer peripheral side of the partition member 15 and is provided in the peripheral groove 15A.
Numeral 6 is made of a rubber material which is sufficiently softer than a lip seal 17 described later. In addition, the rubber ring 16
Is formed as an annular body having a substantially U-shaped cross section that opens outward, and has two inwardly projecting annular legs 16A, 16A on its inner peripheral side. Here, rubber ring 1
6, the leg 16A is brought into contact with the groove bottom of the circumferential groove 15A, so that the flexibility is improved and vibration can be efficiently absorbed. The rubber ring 16 elastically holds the lip seal 17 and absorbs and attenuates minute vibration (high frequency vibration) of the lip seal 17.

Reference numeral 17 denotes an annular lip seal located on the outer peripheral side of the partition member 15 and held by a rubber ring 16. The lip seal 17 is made of a self-lubricating resin material such as polytetrafluoroethylene or the like. It is formed using a material impregnated with a system lubricant. The lip seal 17 includes a base ring portion 17A fitted to the rubber ring 16, and two V-shaped lip portions 17B extending upward and downward away from the outer peripheral surface of the base ring portion 17A. , 17B. And
The lip seal 17 has a shell 1 at the tip of each lip portion 17B.
The upper air chamber D and the lower air chamber E are hermetically sealed by being slidably brought into close contact with the inner peripheral surface of the upper air chamber 3.

Reference numeral 18 denotes a vehicle height sensor provided between the cylinder 3 and the shell 13. The vehicle height sensor 18 detects the height of the vehicle, and detects the position of the cylinder 3 with respect to the shell 13. are doing.

On the other hand, reference numeral 19 denotes an upper air chamber D of the air spring 12 provided on the first air suspension 1 located on the left side and an air spring 12 'provided on the second air suspension 1' located on the right side. An air pressure supply / discharge pipe connecting the lower air chamber E ′, and the supply / discharge pipe 19 supplies and discharges air pressure between the upper air chamber D and the lower air chamber E ′.

The reference numeral 20 designates an upper air chamber D 'of the air spring 12' provided in the second air suspension 1 'and a lower air chamber E of the air spring 12 provided in the first air suspension 1'. In the air pressure supply / discharge pipe to be connected, the supply / discharge pipe 20 supplies and discharges air pressure between the upper air chamber D ′ and the lower air chamber E.

Reference numeral 21 denotes an air compressor for supplying compressed air into the air chambers D, E, D 'and E'.
Is connected to the air pressure supply / discharge pipe 19, via the air supply valve 22, 22 '.
20. Reference numerals 23 and 23 'denote exhaust valves connected to the air pressure supply / discharge pipes 19 and 20, and reference numeral 24 denotes an accumulator for storing pressurized compressed air.

The vehicle suspension device according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

First, when the vehicle runs and gets over bumps and bumps on the road surface, slight vibrations and fast vibrations occur in the vehicle. In this case, the air springs 12, 12 'expand or contract to absorb vibration. The hydraulic shock absorbers 2, 2 'have damping force valves 8, 7 provided on the pistons 7, 7' when the piston rods 10, 10 'extend and contract.
The vibration is attenuated by 9, 8 'and 9'. This allows
The ride comfort during traveling can be improved.

On the other hand, for example, when the vehicle corners rightward, the first air suspension 1 located on the outside contracts and the second air suspension 1 'located on the inside tends to extend. That is, since the partition member 15 provided on the first air spring 12 moves upward with respect to the shell 13, the upper air chamber D is compressed and the lower air chamber E expands. Further, since the partition member 15 'provided on the second air spring 12' moves downward, the upper air chamber D 'expands and the lower air chamber E' is compressed.

However, in the present embodiment, the high air pressure in the upper air chamber D provided in the first air spring 12 is lower than that provided in the second air spring 12 'through the air pressure supply / discharge pipe 19. The lower air chamber E 'acts on the lower air chamber E'.
Of the second hydraulic shock absorber 2 ', the force repelling the force for extending the piston rod 10' of the second hydraulic shock absorber 2 'increases. Also, the upper air chamber D 'of the second air spring 12'
A force (air pressure) for extending the piston rod 10 ′ of the second hydraulic shock absorber 2 ′ inside the first air spring 12 can be released to the lower air chamber E of the first air spring 12 through the air pressure supply / discharge pipe 20. it can.

Thus, the expansion of the second air suspension 1 '(the piston rod 10' of the second hydraulic shock absorber 2 ') located inside the cornering can be suppressed, and the rolling can be suppressed. In addition, minute vibrations generated during cornering can be absorbed and attenuated by the compression and expansion of air in the air pressure supply / discharge pipes 19 and 20 and the like.

Thus, according to the present embodiment, the upper air chamber D of the first air suspension 1 disposed on the left side of the vehicle and the lower air supply of the second air suspension 1 'disposed on the right side. The chamber E 'is connected by an air pressure supply / discharge pipe 19, and the upper air chamber D' of the second air suspension 1 'and the lower air chamber E of the first air suspension 1 are connected by an air pressure supply / discharge pipe 20. For example, from the upper air chamber D compressed by the first air suspension 1 located outside when cornering to the right, to the upper air chamber D 'of the second air suspension 1' located inside cornering, for example. The air pressure can be supplied so as to repel the elongation, and the elongation of the second air suspension 1 'can be suppressed. As a result, it is possible to suppress rolling when the vehicle is cornering,
The running stability can be improved.

Further, the minute vibration generated during cornering can be absorbed and attenuated by compressing and expanding the air in each of the air pressure supply / discharge pipes 19, 20 to improve the ride comfort. Can be.

On the other hand, since the air chambers D, E and the air chambers E ', D' are connected by the air pressure supply / discharge pipes 19, 20, compared with the prior art in which the oil chambers are connected by pipes. As a result, when connecting the air pressure supply / discharge pipes 19 and 20, there is no occurrence of a problem due to mixing of air or the like. Thus, the pneumatic supply / discharge pipes 19, 20 and the like can be easily connected at the time of assembling work at the time of manufacture, replacement work at the time of maintenance, and the like, thereby improving workability.

Further, a lip seal 17 for hermetically sealing the upper air chamber D and the lower air chamber E of the air spring 12 is provided.
Is held by the flexible rubber ring 16,
Small vibrations generated when the lip seal 17 slides on the inner surface of the shell 13 are absorbed by the rubber ring 16,
Can be attenuated. Thereby, the lip seal 17
Life can be extended.

Next, FIG. 3 shows a second embodiment of the present invention. The feature of the present embodiment is that the shock absorber has a structure in which air is accommodated in the cylinder and damping force is generated by the flow resistance of the air, and the air chamber provided in the air chamber of the air spring and the counterpart shock absorber is provided. Are connected via an air pressure supply / discharge pipe.

Reference numeral 31 denotes a first air suspension provided on the left side of the vehicle according to the present embodiment. The air suspension 31 is formed by a first air pressure buffer 32 and a first air spring 42 described later. It is roughly configured.

Reference numeral 32 denotes a first air suspension 31, which is a first pneumatic shock absorber for damping the vibration of the vehicle. The pneumatic shock absorber 32 includes a cylinder 33 and a piston 3 which will be described later.
7, the piston rod 40, the throttle passage 41 and the like.

Reference numeral 33 denotes a cylindrical cylinder forming an outer shell of the first pneumatic shock absorber 32. The cylinder 33 is closed at its upper side by an upper cap 34 also serving as a rod guide, and at its lower side by a bottom cap 35. It is closed. An annular seal 36 is provided on the inner peripheral side of the upper cap 34. Further, below the bottom cap 35, the cylinder 33 is mounted on the wheel side of the vehicle (not shown).
Is provided with a mounting eye 35A.

Reference numeral 37 denotes a piston slidably inserted into the cylinder 33. The piston 37 defines the cylinder 33 into an upper rod-side air chamber F and a lower bottom-side air chamber G. ing. A rubber ring 38 made of a sufficiently flexible rubber material and a lip seal 39 held by the rubber ring 38 are provided on the outer peripheral side of the piston 37. Here, the lip seal 39 is a material obtained by impregnating a self-lubricating resin material such as polytetrafluoroethylene with an oil-based lubricant, like the lip seal 17 according to the above-described first embodiment. It is formed using.

Reference numeral 40 denotes a piston rod inserted into the cylinder 33. The piston rod 40 has a lower end attached to the piston 37, an upper end protruding out of the cylinder 33, and a tip end located on the vehicle body side (not shown). ). The piston rod 40 has an air passage 4 having one end opened to the rod-side air chamber F and the other end opened to the tip.
0A is formed.

Reference numeral 41 denotes a throttle passage which is located near the lower side of the cylinder 33 and communicates with the bottom side air chamber G.
1 is to generate a damping force by giving a flow resistance to air sucked and discharged from the bottom side air chamber G when the piston 37 is displaced in the cylinder 33.

Next, reference numeral 42 denotes a first air spring provided on the outer peripheral side of the piston rod 40. The air spring 42 has a closed cylindrical shell 43 attached to the protruding end side of the piston rod 40; The space between the lower end of the shell 43 and the outer periphery of the cylinder 33 is kept airtight, and the shell 43 and the cylinder 3
Flexible rubber 44 that allows relative movement with
The shell 43 and the rubber 44 define a spring air chamber H. Reference numeral 45 denotes a vehicle height sensor for detecting the vehicle height.

On the other hand, reference numeral 46 denotes a spring air chamber H of an air spring 42 provided on the first air suspension 31 located on the left side, and a second air suspension 31 'located on the right side.
The air pressure supply / discharge pipe 46 is connected to the rod side air chamber F 'of the pneumatic buffer 32'
Is for supplying and discharging air pressure between the spring air chamber H and the rod-side air chamber F '.

Reference numeral 47 denotes a spring air chamber H 'of an air spring 42' provided on the second air suspension 31 'located on the right side and a pneumatic buffer provided on the first air suspension 31 located on the left side. A pneumatic supply / discharge pipe connecting the rod side air chamber F of the vessel 32 with the pneumatic supply / discharge pipe 47
Is for supplying and discharging air pressure between the spring air chamber H 'and the rod side air chamber F.

Reference numeral 48 denotes an air compressor for supplying compressed air to the air chambers F, H, F ', H'.
Are connected to pneumatic supply / discharge pipes 46,
47. Reference numerals 50 and 50 'denote exhaust valves connected to the air pressure supply / discharge pipes 46 and 47, reference numeral 51 denotes an accumulator for storing pressurized compressed air, and reference numeral 52 denotes an air dryer for supplying dry outside air to the air compressor. ing. Reference numeral 53 denotes a supply / discharge pipe connecting the throttle passages 41 and 41 'to the air dryer 52.
3 is a bottom-side air chamber G, G 'via an air dryer 52.
To supply and exhaust air.

In the vehicle suspension device according to the present embodiment having the above-described configuration, for example, when the vehicle corners rightward, the first pneumatic shock absorber 32 located outside is provided.
Of the first air spring 42 is compressed, and the piston air chamber H provided in the first air spring 42 is compressed. The rod side air chamber F provided in one pneumatic shock absorber 32 expands. Also, the second air spring 42 '
Is expanded, and the rod-side air chamber F 'provided in the second pneumatic shock absorber 32' is compressed.

However, in the present embodiment, the high air pressure in the spring air chamber H of the first air spring 42 located on the outside is reduced by the air pressure buffer 32 ′ located on the inside via the air pressure supply / discharge pipe 46. Acting on the rod-side air chamber F ', the pressure in the rod-side air chamber F' rises,
The force repelling the force for extending the 2 'piston rod 40' increases. Also, the inner spring air chamber H '
A force (air pressure) for extending the piston rod 40 ′ of the pneumatic shock absorber 32 ′ can be released to the outer rod side air chamber F via the air pressure supply / discharge pipe 47. Thereby, the expansion of the second air suspension 31 'located inside the cornering can be suppressed, and the rolling can be suppressed.

On the other hand, the pneumatic damper 32 applies a flow resistance to the air supplied and discharged from the throttle passage 41 in accordance with the displacement of the piston 37, thereby generating a damping force and damping the vibration of the vehicle, and The comfort is good.

Thus, according to the present embodiment, the rolling of the vehicle can be suppressed, and the vibration can be damped by the pneumatic damper 32 using air, so that the riding comfort can be improved. Therefore, there is no need to worry about oil leakage and the like, the structure can be simplified, and the shock absorber can be manufactured at low cost.

In the first embodiment, the partition member 1
Although the case where the lip seal 17 composed of the base ring portion 17A and the V-shaped lip portions 17B and 17B is provided on the outer peripheral side of 5 has been described as an example, the present invention is not limited to this. As in the first modified example shown, a seal member 61 having an X-shaped cross section may be provided on the outer peripheral side of the partition member 15. Further, as in a second modified example shown in FIG. 5, a configuration may be adopted in which an O-ring 71 is provided on the outer peripheral side of the partition wall member 15. These configurations can be similarly applied to the second embodiment.

Further, in the first embodiment, the hydraulic shock absorber 2 has the cylinder 3 formed as a single cylinder, and is provided with a free piston 11 in order to allow a penetration volume of the piston rod 10. However, the present invention is not limited to this, and the cylinder is formed in a double cylindrical shape by an outer cylinder and an inner cylinder, and a piston rod enters between the outer cylinder and the inner cylinder. A hydraulic shock absorber provided with a gas chamber for allowing a volume may be applied.

Further, in the first embodiment, the case where the hydraulic shock absorber 2 filled with the oil liquid is used as an example has been described. However, the present invention is not limited to this. Instead of the shock absorber 2, a pneumatic shock absorber substantially similar to the pneumatic shock absorber 32 used in the second embodiment may be used.

On the other hand, in each of the embodiments, the case where the air suspensions 1, 1 'are arranged on the left and right sides of the vehicle to suppress the rolling of the vehicle from swaying left and right has been exemplified. The air suspensions 1, 1 'may be disposed in front of and behind the vehicle. In this case, pitching of the vehicle swinging forward and backward can be suppressed.

Further, in each embodiment, the case where the vehicle suspension device is applied to a four-wheeled vehicle has been described as an example. However, the present invention is not limited to this, and may be applied to a two-wheeled vehicle.

[0068]

As described in detail above, according to the first aspect of the present invention, the air spring is provided with a partition member fixed to the cylinder side to define the air chamber into two chambers, The two chambers defined by are configured to individually supply and discharge air pressure from the outside. Here, for example, a pair of vehicle suspension devices is provided, and when each piston rod is reduced, a chamber compressed in one air spring and a chamber expanded in the other air spring are connected,
A chamber that is compressed in the other air spring is connected to a chamber that expands in the one air spring. Accordingly, when the paired suspension devices are disposed on the left and right sides of the vehicle, when the vehicle corners, the piston rod of the shock absorber located outside contracts and the piston rod of the shock absorber located inside extends. try to.

However, at this time, the air pressure of the chamber compressed by the outer air spring acts on the chamber to be contracted by the inner air spring, and the expansion and displacement of the piston rod of the inner shock absorber is suppressed. Therefore, rolling of the vehicle can be suppressed. In addition, when the pair of suspension devices are disposed before and after, the pitching of the vehicle can be suppressed.

As a result, rolling and pitching of the vehicle can be suppressed, and running stability can be improved. Further, since the air flowing between the respective rooms is compressible, the air can be compressed and expanded to absorb minute vibrations, thereby improving ride comfort.

According to the second aspect of the present invention, the first and second air springs are provided with air pressure supply / discharge pipes for supplying / discharging the air pressure in the air chamber to a counterpart buffer or the air chamber side. The supply / discharge pipe is configured such that when one of the first and second shock absorbers is contracted and displaced, the piston rod of the other damper is prevented from being extended and displaced. Here, for example, when suppressing rolling when the vehicle corners, the first shock absorber and the first air spring are disposed on the left side of the vehicle, and the second shock absorber and the second air spring are connected to each other. Located on the right side of the vehicle. As a result, when the vehicle corners to the right, the piston rod of the left shock absorber located outside contracts, and the piston rod of the right shock absorber located inside tries to extend.

However, at this time, the air pressure supply / discharge pipe supplies / discharges the air pressure in the left air spring to the other right buffer or air chamber side, and the piston rod of the right buffer is extended and displaced. Therefore, rolling of the vehicle can be suppressed. In addition, by arranging the first shock absorber and the first air spring on the front side of the vehicle and arranging the second shock absorber and the second air spring on the rear side of the vehicle, pitching of the vehicle is suppressed. be able to.

As a result, rolling and pitching of the vehicle can be suppressed, and running stability can be improved. Further, since the air flowing through each air pressure supply / discharge pipe is compressible, this air can be compressed and expanded to absorb minute vibrations, thereby improving ride comfort.

On the other hand, since the air pressure supply / discharge pipe provided between the air chamber and the other shock absorber or air chamber allows air to flow therethrough, assembly work during manufacturing, replacement work during maintenance, etc. , The air pressure supply / discharge pipe can be easily connected, and the workability can be improved.

According to the third aspect of the present invention, since the shock absorber is configured to contain air in the cylinder and generate a damping force by the flow resistance of the air, when the piston rod of the shock absorber expands and contracts, Flow resistance is given to the flowing air, and a damping force is generated by this flow resistance,
Vibration can be suppressed. As described above, the pneumatic shock absorber has no fear of oil leakage or the like, can have a simplified structure, and can reduce manufacturing costs.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a vehicle suspension device according to a first embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing a main part of a piston, a rubber ring, a lip seal and the like in FIG. 1 in an enlarged manner.

FIG. 3 is a longitudinal sectional view showing a vehicle suspension device according to a second embodiment of the present invention.

FIG. 4 is an enlarged vertical sectional view of a main part of a seal member according to a first modified example of the present invention, together with a piston, a rubber ring, and the like, viewed from the same position as in FIG.

FIG. 5 is an enlarged vertical sectional view of a main part of an O-ring according to a second modified example of the present invention, together with a piston, a rubber ring and the like, viewed from the same position as in FIG.

[Explanation of symbols]

 1, 1 ', 31, 31' Air suspension 2, 2 'Hydraulic shock absorber 3, 3', 33, 33 'Cylinder 7, 7', 37, 37 'Piston 10, 10', 40, 40 'Piston rod 12 , 12 ', 42, 42' Air spring 15, 15 'Partition member 19, 20, 46, 47 Pneumatic supply / discharge pipe 32, 32' Pneumatic buffer 41, 41 'Throttle passage D, D' Upper air chamber E, E 'Lower air chamber F, F' Rod air chamber H, H 'Spring air chamber

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F16F 9/46 F16F 9/50 9/50 9/32 HV (72) Inventor Takashi Nezu Kawasaki City, Kanagawa Prefecture 1-6-3 Fujimi, Kawasaki-ku Tokiko Corporation F-term (reference) 3D001 AA03 AA04 AA18 AA19 BA01 CA01 DA02 EA04 EA08 EB15 EB24 EB26 3J069 AA16 AA20 AA28 AA50 AA53 AA56 CC13 CC15 DD47 EE35 EE62 EE70

Claims (3)

[Claims] 1. A shock absorber for damping vibration of a vehicle as a piston rod expands and contracts from a cylinder, and air provided between the cylinder and the piston rod of the shock absorber for urging the piston rod in an extending direction. A suspension device for a vehicle, comprising an air spring having a chamber, wherein the air spring is provided with a partition member fixed to the cylinder side to define the air chamber into two chambers, and the partition member is formed by the partition member. A suspension device for a vehicle, characterized in that the two chambers thus formed are configured to individually supply and discharge air pressure from the outside. 2. A first and second shock absorber for damping vibration of a vehicle by a piston rod being extended and contracted by a cylinder, and provided between the cylinder and the piston rod of the first and second shock absorbers. In a vehicle suspension device including first and second air springs having an air chamber for urging the piston rod in the extending direction, the first and second air springs apply air pressure in the air chamber. An air pressure supply / discharge pipe for supplying / discharging to / from the counterpart buffer or air chamber side is provided, and the air pressure supply / discharge pipe is provided in the first and second buffers.
A vehicle suspension device characterized in that when one of the piston rods is contracted and displaced, the piston rod of the other damper is prevented from being extended and displaced. 3. The vehicle suspension device according to claim 1, wherein the shock absorber is configured to contain air in the cylinder and generate a damping force by a flow resistance of the air.