JP2702512B2 - Vehicle suspension device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a telescopic cylinder which is installed between a sprung portion and a unsprung portion of a vehicle and provided independently for each wheel. More particularly, the present invention relates to an arrangement structure of an accumulator for storing the pressure of hydraulic oil supplied to a cylinder.

(Prior Art) Today, there are various types of suspension devices mounted on vehicles, and among them, a device called an active suspension device attracts attention as a device that can improve the ride comfort and stabilize the vehicle body posture. Have been. This one is
For example, as disclosed in European Patent Application Publication No. 0114757, a cylinder is provided between a vehicle body as a sprung part and a wheel side as a unsprung part in a vehicle, and a cylinder which can expand and contract in accordance with the relative displacement thereof. And, while communicating the fluid chamber of this cylinder to a pressure source such as a pump via a fluid passage,
A control valve for controlling the supply and discharge of the fluid to and from the cylinder fluid chamber is provided in the middle of the fluid passage, and the control valve changes and adjusts the suspension characteristics by supplying and discharging the fluid to and from the fluid chamber of each cylinder. It is like that.

(Problems to be Solved by the Invention) By the way, as a fluid used in this type of suspension device, an oil is employed in order to be able to perform control accurately without incompressibility, with good control followability. However, on the other hand, the following problem occurs.

That is, in order for each cylinder to generate a reaction force against the load from the wheel side, it is necessary to supply high-pressure oil to the fluid chamber. In that case, an accumulator is connected to an oil passage from the oil pump to the control valve to accumulate pressure in the accumulator, and with the opening operation of the control valve,
In order to supply the high-pressure oil in the accumulator to the cylinder fluid chamber quickly at once, it is performed.

However, since the oil pump is driven by the on-board engine, the accumulator may be located close to the engine.In this case, if the accumulator is damaged by an impact due to a front collision of the vehicle or the like, the accumulator jumps out due to the damage. The oil may be applied to the engine, which is not preferable.

The present invention has been made in view of such a point, and an object of the present invention is to specify an arrangement and a support structure of the accumulator, thereby forcibly blocking oil ejected from the accumulator due to breakage, and An object of the present invention is to ensure that scattering to an engine can be reliably prevented, and to support with high reliability and durability.

(Means for Solving the Problems) In order to achieve the above object, a solution of the present invention is provided between a sprung portion and a unsprung portion of a vehicle, and is provided independently for each wheel. A suspension device for a vehicle in which suspension characteristics are changed and adjusted by supplying and discharging hydraulic oil to and from a fluid chamber of a telescopic cylinder, wherein an oil pump for discharging hydraulic oil and a hydraulic pressure discharged from the oil pump are provided. A plurality of accumulators for accumulating oil, and provided in an oil passage downstream of the accumulator, independently provided to correspond to the cylinders so as to control supply and discharge of hydraulic oil accumulated in the accumulator to and from the cylinder fluid chamber. A plurality of control valves provided. The control valve is divided into two valve units for left and right front wheels and left and right rear wheels. The accumulator is provided integrally with each valve unit. Further, the valve unit for front wheels and the accumulator are provided on the front of the vehicle. The vehicle is disposed in the wheel-side space formed by a wheel apron and a fender which are separated into an engine room space and a wheel-side space in which a front wheel is disposed, and is elastically supported by a side frame and a bumper slider. I do.

(Operation) With the above configuration, according to the present invention, a wheel apron and a fender, in which a unitized front wheel accumulator and valve unit are separated into an engine room space at the front of the vehicle body and a wheel side space where the front wheels are arranged. Even if the accumulator is damaged due to the front collision of the vehicle and the high-pressure oil stored inside is ejected, the oil is cut off by the wheel apron etc. It does not jump into the engine room inside, so that scattering to the engine can be reliably prevented.

Furthermore, since the unitized accumulator and valve unit for the front wheels are elastically supported by the side frame and the bumper slider, a special mounting bracket is not required, and the side frame and the bumper slider which are strength members are used. Highly reliable for fixing to. In addition, the elastic support structure can absorb the dimensional variation between the unit and the pipe and reduce the stress on the pipe.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 7 schematically shows the overall configuration of a suspension device according to an embodiment of the present invention, wherein 1 is a vehicle body constituting a sprung portion, 2 is a front wheel, 3 is a rear wheel, and these wheels 2, 3 ( Before/
The rear wheel) is supported by a wheel support member (not shown) such as an axle, and the unsprung portion is constituted by the wheels 2, 3 and the wheel support member.

As shown in FIG. 6, extendable hydraulic cylinders 4 to 7 are provided between the sprung portion and the unsprung portions. Each of the cylinders 4 to 7 includes a cylinder body 4a to 7a connected to the vehicle body 1 and a cylinder body 4a to 7a.
4a to 7a are fitted reciprocally in the cylinder body 4a to
Pistons 4c to 7c defining and defining hydraulic chambers 4b to 7b in the inside of the piston rods 4d to 7d.The pistons 4c to 7c are integrally attached with downwardly extending piston rods 4d to 7d, respectively.
7d are connected to the respective wheel support members (wheels 2, 3). Further, the hydraulic chambers 4b to 7b of the cylinders 4 to 7 are provided.
Is an oil pump 9 serving as a hydraulic pressure source through an oil passage 8.
And the cylinders 4-
The same number (four) of control valves 11 to 14 as the wheels 2 and 3 are provided for controlling the supply and discharge of oil to and from the hydraulic chambers 4b to 7b. Each of the control valves 11 to 14 is a control unit.
The control unit 70 includes a vehicle height sensor 71 for detecting a vehicle height (the height of the vehicle body 1) and a pressure sensor for detecting a pressure at a predetermined portion in the oil passage 8. , And an acceleration sensor 73 for detecting the acceleration of the vehicle body 1 in the up-down direction are input. By operating and controlling the control valves 11 to 14 based on these signals, Hydraulic chamber 4b of each cylinder 4-7
The suspension characteristics of the vehicle are changed and adjusted by supplying and discharging oil to and from 7b.

The oil pump 9 is an oil pump composed of a vane pump for a power steering device as shown in FIG.
For example, a radial piston pump, which is a dual pump with 10, is driven by an in-vehicle engine (not shown) disposed in an engine room 1 a (see FIG. 2) in the front of the vehicle body 1. Is done. The suction side of the oil pump 9 is connected to a reserve tank 15 via a suction passage 8h. On the other hand, a supply passage 8a is connected to the discharge side, and a downstream portion of the supply passage 8a is branched into two branch supply passages 8b, 8b on a front wheel side and a rear wheel side. Are further branched and connected to two branch supply passages 8c. The downstream ends of the four branch supply passages 8c are connected to control valves 11 to 14 corresponding to the cylinders 4 to 7, respectively.

Each of the control valves 11 to 14 is a three-port proportional solenoid valve capable of taking three positions of supply, discharge, and shut-off, and the downstream ends of the branch supply passages 8c are connected to the supply ports 11a to 14a. Further, a discharge passage 8d is connected to the discharge ports 11b to 14b, and a downstream end of the branch discharge passage 8d is connected to a front-wheel or rear-wheel-side collective discharge passage 8e, 8e together with the other same passage 8d. The downstream ends of the discharge passages 8e, 8e are assembled together in a collective discharge passage 8f and connected to the reserve tank 15. On the other hand, the supply / discharge ports 11c to 14c communicate with the hydraulic chambers 4b to 7b of the cylinders 4 to 7 via the supply / discharge passage 8g.

The front wheel side branch supply passage 8b has three front wheel main accumulators 16, 16,..., And the rear wheel side branch supply passage 8b has one main accumulator.
The two main accumulators 17 for the rear wheels are branched and connected, and these accumulators 16 and 17 smooth the pulsation of the discharge pressure of the oil pump 9 and set the line pressure of the pressure line in the supply passages 8a to 8c by accumulating the pressure. Things. Also, a front wheel return accumulator 18 is connected to the front wheel side collective discharge passage 8e, and a rear wheel return accumulator 19 is branch connected to the rear wheel side collective discharge passage 8e, and these accumulators 18, 19 are controlled valves 11 to 1 respectively.
A sudden increase in pressure when oil is discharged to the discharge passages 8d to 8f in accordance with the switching operation of 4 is absorbed to suppress a so-called water hammer phenomenon.

Reference numerals 20 and 21 denote gas springs connected in parallel to the hydraulic chambers 4b to 7b of the cylinders 4 to 7 via communication passages 8i and 8j, respectively. The gas springs 20a and 21a are formed by bellows similarly to the accumulator. Oil chambers 20b, 21b are built in, and oil chambers 20b,
21b communicates with the hydraulic chambers 4b to 7b of the cylinders 4 to 7, and gas is sealed in the gas chambers 20a and 21a.
The compression of the gas inside absorbs pressure fluctuations in relatively high frequency ranges in the hydraulic chambers 4b to 7b of the cylinders 4 to 7, that is, vibrations of the wheels 2 and 3. And these two gas springs 2
Orifices 22, 23 having different flow rate characteristics are provided in communication passages 8i, 8j between 0, 21 and the cylinders 4 to 7, respectively.
The two types of orifices 22 and 23 are used to obtain vibration absorption characteristics in a wide frequency range.

To explain the auxiliary function, 9a is a relief valve in the pump for adjusting the discharge pressure inside the oil pump 9,
Reference numeral 24 denotes an unload relief valve interposed between the supply passage 8a and the collective discharge passage 8f.
The line pressure set by 7 is the upper limit (for example, 160 kg / c
When the pressure rises above m ² ), the valve opens to relieve the discharge oil from the oil pump 9 to the reserve tank 15, and when the line pressure falls below the lower limit (for example, 120 kg / cm ² ), the valve closes to reserve the discharge oil. Stop the relief of 15 to the tank,
The line pressure is kept within a set range. Each of the above supply and discharge passages
8g for normally closed shut-off valve 25 with line pressure as pilot pressure
An electromagnetic switching valve 26 is disposed in a pilot passage 8k that connects the shutoff valve 25 and the branch supply passage 8b (pressure line). The switching valve 26 is connected to the discharge passage 8 via a relief passage 8l. 8d.When the electromagnetic switching valve 26 is energized, the pilot passage 8k is opened and the relief passage 8l is closed to open the shut-off valve 25 and open the supply / discharge passage 8g. By closing the passage 8k and reducing the pilot pressure to the shut-off valve 25 to zero, the shut-off valve 25 is closed to close the supply / discharge passage 8g, that is, the ignition key switch of the vehicle is turned off.
When the switching valve 26 is de-energized by the F operation, or when the line pressure decreases due to the failure of the hydraulic piping and the pilot pressure of the shut-off valve 25 disappears even when the switching valve 26 is energized, the shut-off valve 25 is closed. The oil is closed in the hydraulic chambers 4b to 7b of the cylinders 4 to 7 by making valves.

A pilot pressure reducing valve 27 is provided in each of the branch supply passages 8c. The pressure reducing valve 27 is a branch supply passage downstream of the pressure reducing valve 27.
The difference between the oil pressure on the pressure reducing valve 27 and the oil pressure on the downstream side is maintained at a constant value using the oil pressure of 8c and the oil pressure of the supply / discharge passage 8g as pilot pressure. Similarly, a pilot pressure reducing valve 28 is provided in each of the branch discharge passages 8d.
Numeral 28 is used to maintain the difference between the oil pressure on the pressure reducing valve 28 and the oil pressure on the downstream side at a constant value, using the oil pressure of the upstream branch discharge passage 8d and the oil pressure of the supply / discharge passage 8g as pilot pressure.
Further, between each of the supply and discharge passages 8g and the branch discharge passage 8d,
When the pressure in the supply / discharge passage 8g exceeds the limit value, a relief valve 29 is provided to open the valve and relieve the oil to the discharge passage 8d. In FIG. 6, reference numeral 48 denotes an oil filter.

Of the above hydraulic devices, the control valves 11 and 12 corresponding to the left and right front wheels 2 and 2, the shutoff valves 25 and the switching valves 26, the pressure reducing valves 27 and 28 on the pressure side and the return side, and the relief valves 29 are for the front wheels. The valve unit 30 is integrally formed with the main accumulators 16, 16,... For the front wheels and the return accumulator 18 in parallel. Similarly, control valves 1 corresponding to the left and right rear wheels 3, 3 are also provided.
3, 14, each shut-off valve 25, the switching valve 26, the pressure reducing valves 27 and 28 on the pressure side and the return side, and each relief valve 29 are unitized as a rear wheel valve unit 31.
A main accumulator 17 and a return accumulator 19 for the rear wheels are provided in parallel. Therefore, in this embodiment, the four control valves 11 to 14 are divided into two for front wheels and two for rear wheels by unitization.

FIGS. 1 to 5 show the arrangement of the hydraulic equipment in the vehicle body 1. In the drawings, reference numerals 50, 50 denote left and right front side frames extending in the front-rear direction on the left and right sides of the front bottom surface of the vehicle body. A front cross member 51 (first section) extending in the left-right direction extends between the front ends of the side frames 50, 50.
A frame-shaped shroud member 52 (radiator shroud) having a shroud door upper 52a is provided upright behind the cross member 51. Head lamp mounting members are provided on both left and right sides of the shroud member 52. Shroud panels 53 having an opening 53a are arranged. A radiator 54 is disposed behind the shroud member 52. Body 1 of each shroud panel 53
Outside upper and lower reinforcements
The front side frame 50 and upper reinforcement 55 are located behind the shroud panel 53.
A wheel apron 56 is provided to connect the apron. The wheel apron 56 is separated into an engine room space in the front part of the vehicle body and a wheel side space in which the front wheels 2 are arranged. The wheel apron 56 has a wheel house 56a in a portion corresponding to the front wheels 2, and has a center in the center. Strut tower 56 bulging upward
The strut tower 56b is connected to the cylinder bodies 4a, 5a of the cylinders 4, 5 for the front wheels. A front fender 57 extending in the front-rear direction is disposed outside the vehicle body 1 of the wheel apron 56, and the front fender 57 is joined to the upper reinforcement 55 at an upper edge thereof.

Also, in FIG. 2, 58, 58 (only one is shown)
Are left and right side sills extending in the front-rear direction on the left and right sides of the rear bottom surface of the vehicle body. The left and right edges of a floor panel 59 are joined to the both side sills 58, 58.
Is formed with a tunnel portion 59a extending in the front-rear direction formed by bulging the left and right central portions upward. A rear cross member 60 (third cross member) extending in the vehicle width direction and connecting the left and right side sills 58, 58 is disposed on the upper surface of the floor panel 59. After the rear cross member 60, the rear cross member 60 extends in the same direction. A suspension cross member 61 for wheels is provided. The rear end of each of the side sills 58 is joined to a wheel house inner panel 62. The wheel house inner panel 62 is formed with a strut tower 63 which bulges upward at a portion corresponding to the rear wheel 3, and the strut tower 63 The cylinder bodies 6a, 7a of the rear wheel cylinders 6, 7 are connected.

As a feature of the present invention, as shown in FIGS. 1 to 3, a space as a wheel-side space is provided between the wheel apron 56 and the fender 57 at the front left corner of the vehicle body 1.
S ₁ is formed, and the front wheel valve unit is formed in this space S _1.
The main accumulators 16, 16,... And the return accumulator 18 are arranged in a state housed in a closed box-shaped case 32. Support portions 32a, 32 are provided on the right side (the left side in the figure) and the left side (the same right side) of the case 32, respectively.
The right support portion 32a is connected to and supported by the left front side frame 50 via the mount rubber 33 and the bracket 34. On the other hand, the left support portion 32b is connected and supported to a bumper slider 65 that supports the front bumper 64 of the vehicle so as to be slidable rearward with a predetermined load or more. With this structure, the front wheel valve unit 30 is rubberized to the vehicle body 1. Mounted.

On the other hand, the reserve tank 15 is disposed in the space S ₂ as the wheel image space formed by the wheel apron 56 and the fender 57 in the corner portion of the front right of the vehicle body 1.

As shown in FIGS. 2 and 5, in the floor panel 59, the rear cross member 50 and the right side sill 58 are provided.
A portion surrounded by the tunnel portion 59a and the suspension cross member 51 have been bulged upward, a rectangular recess 59b on the bottom surface floor panel 59 having an inner space S ₃ which is open downward by its bulging form are, the rear wheel valve unit 31 in the space S _3, are arranged in a state the main accumulator 17 and a return accumulator 19 (not shown) is housed supported by a support bracket 35. A protector 36 that covers the valve unit 31 and the like is disposed below the valve unit 31 and the like. The protectors 36 are mounted on front and rear ends of the support bracket 35, respectively.
37, 37 (only the front side is shown). In FIG. 2, reference numeral 66 denotes an engine exhaust pipe arranged below the left side of the floor panel 59 of the vehicle body 1.

Therefore, in this embodiment, two control valves 11, 1 for the front wheels are used.
Numeral 2 is disposed near two cylinders 4 and 5 for front wheels, and two control valves 13 and 14 for rear wheels are disposed near two cylinders 6 and 7 for rear wheels.

Reference numerals 38 to 46 denote hydraulic pipes forming the oil passage 8. That is, 38 is the reserve tank 15 and the oil pump 9
The suction pipe 39 connects the suction side of the oil pump 9 to the discharge side of the oil pump 9 and the front wheel valve unit 30 (specifically, the right and left pressure reducing valves 27, 27 and the front wheel main accumulators 16, 16, ...). Main pressure piping, 40
Is a front left pipe connecting the front wheel valve unit 30 (left front wheel control valve 11) and the left front wheel cylinder 4, and 41 is a front wheel valve unit 30 (right front wheel control valve 12) and a right front wheel cylinder 5 Front pipe for connecting the front tank valve unit 30 (left and right return side pressure reducing valves 28, 28) to the reserve tank 15, and 43 for the rear wheel valve unit 31 (left and right). The return piping for the rear wheel connecting the return side pressure reducing valve 28, 28) to the reserve tank 15, 44
Is branched from a main pressure pipe 39 in a case 32 accommodating the front wheel valve unit 30, and is connected to the main pressure pipe 39 and the rear wheel valve unit 31 (the left and right pressure reducing valves).
27, 27 and a branch pressure pipe connecting the rear wheel main accumulator 17). Also, in FIG.
45 is a pipe for the left rear wheel connecting the valve unit 31 for the rear wheel (the control valve 13 for the left rear wheel) and the cylinder 6 for the left rear wheel, and 46 is a valve unit 31 for the rear wheel (the control valve 14 for the right rear wheel). ) Is connected to the right rear wheel cylinder 7.

As shown in FIGS. 1, 2, and 4, the oil discharged from the oil pump 9 is supplied to the cylinder 4 for each wheel.
Main pressure piping 39 to be supplied to 7 to 7, right front wheel piping
41 and the branch pressure pipe 44 are the return pipe 43 for the front wheels.
Together with the shroud member in the shroud member 52
52b, a pair of left and right piping harnesses 47,
47 is fixedly supported on the shroud drawer 52b.

As shown in FIG. 2, the branch pressure pipe 44 for supplying the oil discharged from the oil pump 9 to the rear wheel cylinders 6 and 7 is connected to the vehicle body 1 together with the rear wheel return pipe 43.
On the right side of the vehicle body 1, that is, on the side opposite to the exhaust pipe 66 disposed on the left side of the vehicle body 1.

Therefore, in the above embodiment, when the ignition key switch is turned on and the engine is in the operating state, oil is discharged from the oil pump 9 driven by the engine, and the main accumulator is adjusted by adjusting the unload relief valve 24. A predetermined range of line pressure is accumulated in the pressure lines (supply passages 8a to 8c) communicating with 16,16. In addition, each switching valve 26 is turned ON by the ON operation of the ignition key switch, and accordingly, each shutoff valve 25 that has been closed is switched to the open state, and the supply / discharge passage 8g is opened. The control unit 70 controls the control valves 11 to 14 based on the vehicle height detected by each vehicle height sensor 71, the oil pressure detected by the pressure sensor 72, and the vertical acceleration of the vehicle body 1 detected by the acceleration sensor 73. The operation of each of the control valves 11 to 14 controls the supply of high-pressure oil to the hydraulic chambers 4b to 7b of the cylinders 4 to 7 or the oil in the hydraulic chambers 4b to 7b. Then, the suspension characteristics are changed and adjusted to predetermined characteristics.

In this embodiment, the main accumulator 16 and 16 on the wheel side space S ₁ formed between the wheel apron 56 and the fender 57 in corners of the front left of the vehicle body 1, ... and the return accumulator 18 is a valve for a front wheel Since both the accumulators 16 and 18 are damaged in the unlikely event that both of the accumulators 16 and 18 are damaged, the oil is scattered by the case 32 and the wheel apron 56 because the unit 30 and the unit 30 are arranged in a sealed box-shaped case 32 in a state of being stored as a storage unit. It is not blocked and does not jump into the engine room 1a, so that it is possible to reliably prevent the squirted oil from scattering to the engine. Furthermore, the accumulators 16 and 18 and the valve unit 3
0 is supported by the front side frame 50 and the bumper slider 65, so that a special mounting bracket is not necessary and the front side frame 50, which is a strength member, is not required.
In addition, since it is fixed to the bumper slider 65, the reliability is high.
Moreover, the accumulators 16 and 18 and the valve unit 3
Since 0 is elastically supported by the mount rubber 33 with respect to the vehicle body, variations in the dimensions between the unit and the pipe can be absorbed, and stress on the pipe can be reduced.

The four control valves 11 to 14 are divided into front and rear wheel side valve unit 30, 31 as front and rear wheel valve units 30 and 31, respectively, and two control valves 11 and 12 for front wheels (front wheel). The valve unit 30) for the rear wheel is located at a position close to the front wheel cylinders 4 and 5 at the front left corner of the vehicle body 1, and the two control valves 13 and
Since 14 (rear wheel valve unit 31) is disposed below the floor panel 59 at the rear of the vehicle body 1 and at a position close to the rear wheel cylinders 6, 7, two control valves 11, 12 for front wheels are used.
And the length of each supply / discharge passage 8g between the front wheels 4 and 5 corresponding to the control valves 11 and 12, and the two control valves 13 and 1 for the rear wheels.
The length of each supply / discharge passage 8g between 4 and the rear wheel cylinders 6 and 7 corresponding to the control valves 13 and 14 is longer than that in the case where the four control valves 11 to 14 are arranged at the center of the vehicle body 1. Both are shorter. For this reason, the pipe resistance in the pipe connecting the control valves 11 to 14 and the wheel cylinders 4 to 7 corresponding to the control valves 11 to 14 is reduced, and the control valves 4 to 7 are switched accordingly. Hydraulic chambers 4b-7b of cylinders 4-7 from pressure line
Pressure loss of the oil supplied to the cylinders and the pressure loss of the oil discharged from the hydraulic chambers 4b to 7b to the discharge passages 8d to 8f are all reduced, so that the supply and discharge control of the oil to and from the cylinders 4 to 7 is accurately performed. Thus, the desired suspension characteristics can be obtained accurately.

Moreover, the front wheel main accumulators 16, 16,...
The main accumulators 16 and 17 are arranged close to the corresponding wheel cylinders 4 to 7, respectively, so that the accumulators 16 and 17 to the control valves 11 to 14 The distance is also shortened, and the oil supplied from the accumulators 16 and 17 to the cylinders 4 to 7 can be supplied while suppressing the pressure drop, and the supply and discharge control of the oil to and from the cylinders 4 to 7 can be performed more accurately.

A main pressure pipe for supplying oil discharged from the oil pump 9 to the cylinders 4 to 7 for each wheel.
39, since the right front wheel pipe 41 and the branch pressure pipe 44 are arranged in front of the shroud drawer 53a of the shroud member 53 together with the front wheel return pipe 42, these pipes 39, 41, 44 Is damaged and high-pressure oil is ejected, the oil is blocked by the shroud member 52 and the radiator 54 disposed behind the shroud member 52,
Oil can reliably be prevented from jumping into the engine room 1a.

Moreover, since these pipes 39, 41, and 44 are exposed to the cold running wind before being introduced into the radiator 54, the oil flowing inside can be cooled, and the cooling property of the oil that generates heat by increasing the pressure is improved. it can.

Further, in the floor panel 59, a portion surrounded by the rear cross member 60, the right side sill 58, the tunnel portion 59a, and the suspension cross member 61 is swelled upward, and is opened downward by the swelling floor panel 59. space S ₃ is formed, the valve unit 31 for the rear wheels in the space S _3, since the main accumulator 17 and the return accumulator 19 is disposed, even a so-called belly beating state body 1 is in contact with the road surface, These devices are unlikely to come into contact with the road surface, and the damage can be suppressed. Moreover, since the protector 36 below each device is provided, the device does not directly contact the road surface, which is further advantageous.

Furthermore, since the accumulators 17, 19, etc. are arranged below the floor panel 59, that is, outside the vehicle, even if the accumulators 17, 19, etc. are damaged, the oil scattered along with them is shielded by the floor panel 59, and It does not enter the room.

In addition, as shown in FIG. 2, a branch pressure pipe 44 for supplying the oil discharged from the oil pump 9 to the rear wheel cylinders 6, 7 is provided with an exhaust pipe 66 located on the right side of the vehicle body 1, that is, on the left side of the vehicle body 1. The oil flowing in the pressure pipe 44 is not heated by the exhaust pipe 66 heated by the exhaust heat and rises to a high temperature because the oil is flowing along the right side sill 58 on the opposite side to the control valves 11 to 11. It is possible to suppress the temperature rise of the oil seal to a temperature equal to or higher than the heat resistance assurance temperature of the oil seal at 14, etc., to effectively prevent the thermal deterioration, and to operate the control valves 11 to 14, etc. stably.

The pressure pipe 44 and the return pipe 43 are exhaust pipes.
Even if these pipes 43 and 44, especially the pressure pipe 44 are damaged and fall into a faulty state, there is no possibility that the ejected oil hits the hot exhaust pipe 66.

(Effects of the Invention) As described above, according to the present invention, a suspension device that changes and adjusts suspension characteristics by supplying and discharging oil to and from a cylinder installed between a sprung portion and a unsprung portion of a vehicle. In the above, an accumulator for accumulating the discharge pressure from the oil pump and a valve unit are unitized, and a wheel apron and a fender for separating a unit for a front wheel into an engine room space and a wheel-side space in which the front wheels are arranged. And is elastically supported by the side frame and the bumper slider, so that even if the accumulator is damaged and high-pressure oil is blown out, the oil remains in the engine room. Of the oil, preventing the oil from splashing into the engine,
The unit can be fixed easily and with high reliability, and the dimensional variation can be absorbed to reduce the stress on the piping, and the durability is excellent.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a front view of the arrangement structure of the hydraulic system as viewed from the front of the vehicle body, FIG. 2 is a plan view of the same as viewed from above, and FIG. III-III line sectional view, FIG. 4 is the same IV-IV line sectional view, FIG. 5 is the same VV line sectional view,
FIG. 6 is a hydraulic circuit diagram, and FIG. 7 is a schematic side view schematically showing an overall configuration of a suspension device. DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Front wheel, 3 ... Rear wheel, 4-7 ... Hydraulic cylinder, 4b-7b ... Hydraulic chamber (fluid chamber), 9 ... Oil pump, 11-14 ... Control valve, 16, 17 Main accumulator, 20, 21 Gas spring, 30 Valve unit for front wheel, 31 Valve unit for rear wheel, 38 to 46 Hydraulic piping, 52 Shroud member, 56 Wheel apron, 57 ... Front fender, 58 ... Side sill, 59 ...
… Floor panel, 59a …… Tunnel part, 60 …… Rear cross member, 61 …… Suspension cross member, 65 ……
Bumper slider, S ₁ , S ₃ …… space.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiki Morita 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Pref. Inside Mazda Co., Ltd. −185608 (JP, U)

Claims (1)

(57) [Claims] 1. A vehicle which is installed between a sprung portion and a unsprung portion of a vehicle,
In a vehicle suspension device in which suspension characteristics are changed and adjusted by supplying and discharging hydraulic oil to and from a fluid chamber of a telescopic cylinder independently provided for each wheel, the hydraulic oil is discharged. An oil pump; a plurality of accumulators for accumulating hydraulic oil discharged from the oil pump; and an oil passage provided in an oil passage downstream of the accumulator, for controlling supply and discharge of the hydraulic oil accumulated in the accumulator to the cylinder fluid chamber. A plurality of control valves independently provided so as to respectively correspond to the cylinders. The control valve is divided into two valve units, one for left and right front wheels and one for left and right rear wheels, and The accumulator is provided integrally with the valve unit, and the valve unit for the front wheel and the accumulator are further provided. The emulator is arranged in the wheel-side space formed by the wheel apron and the fender, which are separated into an engine room space in the front part of the vehicle body and a wheel-side space in which the front wheels are arranged. A suspension device for a vehicle, comprising: