JP2000272321A - Vehicle damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently damp a vehicle's unsprung vibration, rolling, pitching and bouncing. SOLUTION: For unsprung vibration, rolling, pitching and bouncing, an oil flow is generated from one of oil chambers 28, 30 to the other by shrinking and extending of shock absorbers 10 to 16, and a damping force is generated by a flow resistance applying device 26. Furthermore, flow resistance applying devices 60, 72 act in parallel during rolling, and flow resistance applying devices 82, 86, 84 act in line during pitching, and flow resistance applying devices 82, 84 act in parallel during bouncing, thus generating damping forces each time. Damping characteristics of the flow resistance applying devices 26, 60, 72, 82, 84 and 86 can be set accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping device for a vehicle for damping wheel vibrations and vehicle body swings in a vehicle.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 6-72127 describes one such vehicle damping device. This vehicle damping device is provided in the middle of a shock absorber provided on each of the left and right front wheels and a connection passage connecting oil chambers of the respective shock absorbers. A flow resistance applying device that provides a flow resistance, a pair of cylinders, and a pair of pistons that are liquid-tightly and slidably fitted to the pair of cylinders and are integrally connected by a connecting device,
One of the two oil chambers formed on both sides of the piston was connected to each of the two portions of the connection passage on both sides of the flow resistance applying device, and the gas chambers formed on the other sides were communicated with each other. And a twin cylinder.

In the conventional damping device for a vehicle configured as described above, when the vehicle body pitches and bounces, and when the unsprung portion including the wheels and the portion of the suspension device that vibrates together with the wheels vibrates, The movement of the piston occurs in the shock absorber, and the movement causes an oil flow from the oil chamber on one side of the piston to the oil chamber on the other side, and an internal flow provided in the shock absorber for the oil flow. By providing the flow resistance by the flow resistance applying device, a damping force against pitching, bouncing and unsprung vibration is generated.
When the vehicle body rolls, damping force is applied by the flow resistance of the internal flow resistance applying device, and oil flows from one of the left and right front wheel shock absorbers to the other. As a result, the flow resistance is given by the flow resistance applying device, so that a damping force against rolling is generated. However, in the conventional vehicle damping device, since the damping force for pitching and bouncing and the damping force for unsprung vibration are generated by the flow resistance of the internal flow resistance applying device in each shock absorber, the respective structures are used. In this case, it was difficult to obtain a flow resistance imparting characteristic suitable for damping the vibration, and the damping could not be performed well.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a vehicular damping device capable of excellently damping unsprung vibration, rolling, pitching and bouncing. .

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a damping device for a vehicle, comprising: a shock absorber provided between the left and right front wheels, the left and right rear wheels, and the vehicle body; a shock absorber for the left front wheel; A pre-flow resistance applying device that is provided in the middle of a front connection passage connecting the oil chambers with the shock absorber and provides a flow resistance to the flow of oil from one of the oil chambers to the other; a pair of cylinders; A pair of pistons which are fitted to the pair of cylinders in a liquid-tight and slidable manner and are integrally connected by a connecting device, and each one of two oil chambers formed on both sides of the piston is provided with one of the two oil chambers. A front twin cylinder, which is connected to both sides of the front connection passage in the front connection passage and the other ends of which are connected to each other, and a left rear wheel shock absorber. Flow resistance applying device that is provided in the middle of the rear connection passage connecting the oil chambers of the shock absorber and the right rear wheel shock absorber to each other, and applies a flow resistance to the flow of oil from one of the oil chambers to the other. And a pair of cylinders, and a pair of pistons which are fitted to the pair of cylinders in a liquid-tight and slidable manner and are integrally connected by a connecting device. One of the oil chambers is connected to both sides of the rear flow resistance imparting device of the rear connection passage, and the other is connected to each other, the rear twin cylinder, the front twin cylinder, and the rear twin cylinder. Are provided in the middle of a central connection passage connecting the oil chambers which are communicated with each other, and a flow resistor is provided for the oil flow from one of the oil chambers to the other. A pair of cylinders and a pair of pistons which are fitted to the pair of cylinders in a liquid-tight and slidable manner and are integrally connected by a connecting device. A central twin cylinder in which oil chambers formed on one side are respectively connected to both sides of the central flow resistance applying device of the central connection passage, and gas chambers formed on the opposite sides are communicated with each other; A front / central flow resistance applying device for applying a flow resistance to an oil flow between an oil chamber communicated with a front twin cylinder and one of the two oil chambers of the central twin cylinder; The flow resistance to the flow of oil between the oil chambers of the cylinders which are communicated with each other and the other of the two oil chambers of the central twin cylinder; And a post / central flow resistance application device.

[0006]

In the vehicle damping device configured as described above, when the vehicle body rolls, pitches and bounces, the piston moves within each shock absorber, and one side of each piston accompanies the movement. The oil flow from the oil chamber to the opposite oil chamber is generated, and the oil flow is given flow resistance by an internal flow resistance applying device in the shock absorber, and a damping force against rolling, pitching and bouncing is applied. Can be In addition, in each case, oil flows in and out of each shock absorber due to the piston rod of each shock absorber coming into and out of the cylinder, and damping force due to flow resistance applied to these outflows is also added. . During rolling, oil flows from one of the left front wheel shock absorber and the right front wheel shock absorber to the other,
Flow resistance is given to the flow by the pre-flow resistance applying device, and a damping force against rolling is generated. The same occurs between the left rear wheel shock absorber and the right rear wheel shock absorber, and a damping force against rolling is generated. At the time of pitching, oil flows from one of the left and right front wheel shock absorbers and the left and right rear wheel shock absorbers to the other, and the front / center flow resistance applying device and the central flow resistance applying device are applied to the flows. And the flow resistance is provided by the rear / central flow resistance applying device, and a damping force against pitching is generated. At the time of bouncing, in all the shock absorbers of the left and right front wheels and the left and right rear wheels,
Oil inflow or outflow occurs at the same time,
Outflow is allowed by expansion and contraction of the gas chamber in the central twin cylinder. A flow resistance is applied to the accompanying oil flow by each of the front / center flow resistance applying device and the rear / center flow resistance applying device, and a damping force against bouncing is generated.

On the other hand, unsprung vibration damping is performed as follows. If the unsprung portion including the wheel and the portion of the suspension device that vibrates together with the wheel vibrates almost vertically, the flow of oil from the oil chamber on one side of the piston of the shock absorber piston corresponding to the wheel to the oil chamber on the opposite side will occur. The generated oil flow is given flow resistance by the internal flow resistance applying device in the shock absorber, and the unsprung vibration is attenuated. Also, as the piston rod of the shock absorber moves in and out of the cylinder, oil flows in and out of the shock absorber. With respect to the oil flow caused by the inflow and outflow, depending on the operating conditions of other shock absorbers, a pre-flow resistance applying device, a front / central flow resistance applying device, a central flow resistance applying device, a post-flow resistance applying device Flow resistance is provided by either the device or the rear / central flow resistance application device, etc., thereby also damping unsprung vibrations. At this time, if the outflow of oil from the entire shock absorber for the left and right front wheels and the left and right rear wheels is larger than the inflow of oil, the capacity of the gas chamber of the central twin cylinder is reduced.
The volume of the gas chamber is increased.

As described above, according to the damping device for a vehicle according to the present invention, all of the damping of the rolling, pitching and bouncing of the vehicle body and the damping of the unsprung vibration can be realized. The flow resistance applying device and the rear flow resistance applying device work in parallel with each other, and the pitching is performed with the front / center flow resistance applying device,
The central flow resistance imparting device and the rear / central flow resistance imparting device act in series with each other, and the bouncing is effected by the front / central flow resistance imparting device and the rear / central flow resistance imparting device acting in parallel with each other. Therefore, by appropriately setting the flow resistance applying characteristics of each flow resistance applying device, all of rolling, pitching and bouncing can be favorably attenuated. In addition, regarding the unsprung vibration, generally, the inflow and outflow of oil in each shock absorber occurs randomly, so that the oil flowing out of one shock absorber branches into a plurality of flows or flows of a plurality of oils. Are often merged and flow into one shock absorber, and accordingly, a front flow resistance applying device, a front / central flow resistance applying device, a central flow resistance applying device, a rear flow resistance applying device, and a rear / central flow resistance. The flow resistance of the application device and the like is reduced, and a flow resistance application characteristic suitable for damping unsprung vibration having a large frequency compared to rolling, pitching, bouncing and the like is obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram conceptually illustrating a configuration of a vehicle damping device according to the present embodiment. The present damping device is one of the components of the suspension device. In addition, such as a link mechanism and a spring that support the wheels so that they can move
Illustration and description of other components of the suspension device are omitted.
As shown in FIG. 1, the vehicle damping device includes shock absorbers 10, 12, 14, and 16 provided for left and right front wheels and left and right rear wheels, respectively. The shock absorbers 10 to 16 each include a cylinder 20, a piston 2
2, a piston rod 24, a flow resistance applying device 26, and the like. An end of a piston rod 24 is fixed to the piston 22, so that the piston 22 and the piston rod 24 move integrally. Oil chambers 28 and 30 are formed on both sides of the piston 22 by fitting the piston 22 liquid-tightly and slidably into the cylinder 20 filled with oil. The flow resistance applying device 26 will be described later in detail.

In the present embodiment, the cylinder 20 is connected to a vehicle body-side member, and the piston rod 24 is connected to a wheel-side member that moves up and down with respect to the vehicle body together with the wheel (collectively referred to as unsprung together with the wheel). Each of the shock absorbers 10 to 16 is interposed between each unsprung part and the vehicle body. The cylinder 20 may be connected to a wheel-side member, and the piston rod 24 may be connected to a vehicle-side member. In the shock absorbers 10 to 16, the outer peripheral side of the end of the cylinder 20 opposite to the connecting portion with the vehicle body side member is covered with a cylindrical member (not shown). A piston rod 24 extending in the axial direction from the cylinder 20 is fixed in the cylindrical member, and the piston rod 24 is connected to the wheel-side member by connecting the cylindrical member to the wheel-side member. .

Left and right front wheel shock absorbers 10, 12
Oil chambers 28 (or oil chambers 30) may be
Each is connected to the oil chamber of the front twin cylinder 54 via the liquid passages 50 and 52 on the left and right front wheel sides. A flow resistance applying device 60 is provided in the middle of a connection passage connecting these liquid passages 50 and 52 and thus connecting the oil chambers 28 of the shock absorbers 10 and 12 of the left and right front wheels. Similarly, left and right rear wheel shock absorbers 14, 16
Are connected to the rear twin cylinder 70 via liquid passages 66 and 68, and a flow resistance applying device 72 is provided in the connection passage connecting the liquid passages 66 and 68. Further, the front twin cylinder 54 and the rear twin cylinder 70 are connected to the respective oil chambers of the central twin cylinder 80 by liquid passages 76 and 78, respectively. Device 8
2, 84 are provided. The liquid passages 76 and 78 are connected via a flow resistance applying device 86.

The front twin cylinder 54 and the rear twin cylinder 70, and the flow resistance applying device 60 and the flow resistance applying device 72 have the same configuration, respectively. Only the following will specifically describe, and the same portions of the rear twin cylinder 70 and the flow resistance applying device 72 will be denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 2, the front twin cylinder 54 has a pair of cylinders 92, 9 attached to a twin cylinder main body 90.
And bottomed cylindrical pistons 96 and 98 are fitted to the cylinders 92 and 94 in a liquid-tight and slidable manner, respectively. In each of the pistons 96 and 98, the shaft portions 100 provided integrally on the bottom are integrally connected by a connecting member 102. Oil chambers are formed on both sides of the pistons 96 and 98, respectively. One of the oil chambers is a pair of oil chambers 110 and 112 connected to the respective oil chambers 28 via the liquid passages 50 and 52, and the other is a pair of oil chambers. The oil chamber 114 is in communication. Oil chamber 11
Reference numeral 0, 112 denotes a concave space between the pistons 96, 98 and a space surrounded by the pistons 96, 98 and the cylinders 92, 94. The oil chamber 114 is a space on the shaft portion 100 side of the pistons 96, 98. Yes, both are filled with oil. A guide rod 120 is fixed to the center of the connecting member 102, and the guide rod 120 is slidably fitted in a guide hole 128 formed in a guide member 126 fixed to the twin cylinder main body 90. That is, the pistons 96, 9
8, an integrated structure consisting of the connecting member 102 and the guide rod 120 is guided at both ends (pistons 96, 98 and the distal end of the guide rod 120) by the twin cylinder body 90. 92,94
Move in one place.

The flow resistance applying device 60 includes, for example, a leaf valve 140 and a variable throttle device 142 as shown in FIG.
Etc. can be provided. The body member 146 of the flow resistance applying device 60 has a cylindrical shape with a bottom, and the valve support member 148 is fixed in a state where the opening of the body member 146 is closed. ing. By providing the leaf valve 140 in the internal space of the main body, the leaf valve 140 is provided.
Oil chambers 150 and 152 are formed on both sides of the oil chamber. The oil chamber 150 is connected to the liquid passage 50 via a liquid passage 156 formed in a nipple to which a connection pipe (not shown) is connected, and the oil chamber 152 is connected to the liquid passage 52 via liquid passages 160 and 162. ing. Valve support member 148
The nipple is provided with two nipples, and communication passages 164 and 166 are formed to communicate the liquid passages 160 and 162 formed in the nipple with the oil chamber 152. Therefore, the liquid passages 160 and 162 in both nipples communicate with each other via the communication passage 164, the oil chamber 152, and the communication passage 166.

The leaf valve 140 includes a valve body 170
And leaves 172 and 174. Valve body 1
70 is a shaft portion 176 supported by the valve support member 148 and extending in the axial direction, and the valve support member 1 of the shaft portion 176.
A disk portion 178 which is provided at a distal end portion opposite to the base end portion supported by 48 and partitions oil chambers 150 and 152, and leaves 172 and 174 are provided on both sides of the disk portion 178, respectively. Have been. The disc portion 178 has a through hole 1
80 and 182 are formed, and the oil chamber 15 of the through hole 180 is formed.
A valve seat 186 is formed around the 0-side opening, and a valve seat 186 is formed around the opening of the through hole 182 on the oil chamber 152 side. Therefore, the leaf 172 has the through hole 1
80 is closed at the oil chamber 150 side, and the leaf 174 is closed.
Closes the opening of the through hole 182 on the oil chamber 152 side.
Between the leaf 172 and the opening of the through hole 182 on the oil chamber 150 side, and between the leaf 174 and the oil chamber 1 of the through hole 180
A gap is always formed between each of the openings 52 and 52 so that the inflow and outflow of oil are allowed. Leaf 172, 174
Is formed by stacking a plurality of disk-shaped leaves and has flexibility. When the substantial hydraulic pressure difference generated on both surfaces of the leaves 172 and 174 is equal to or larger than the size (valve opening pressure) required for the leaves 172 and 174 to bend, the leaves 172 and 174 are not changed.
The outer peripheral portion of the 174 is bent away from the valve seat 186. Thereby, leaf 17
The flow of the oil is allowed through the gap between the valve seat 186 and the valve seat 186, and a flow resistance is applied to the flow to generate a damping force.

For example, when the hydraulic pressure in the oil chamber 150 becomes higher than that in the oil chamber 152 and the hydraulic pressure difference becomes equal to or higher than the set valve opening pressure, the leaf 174 is bent, and the oil is released from the oil chamber 150.
From the oil chamber 152. Conversely, when the hydraulic pressure in the oil chamber 152 becomes higher than that of the oil chamber 150 and the hydraulic pressure difference exceeds the valve opening pressure, the leaf 172 is bent, and the oil flows from the oil chamber 152 into the oil chamber 150.
The valve opening pressure of the leaves 172 and 174 can be set to an appropriate value as needed.

Inside the shaft portion 176 of the valve body 170,
A through hole 208 extending in the axial direction is formed, and a tip end side is a bypass passage 210 opening to the oil chamber 150. Further, a radial hole 212 penetrating in the radial direction is formed in the shaft portion 176, and opens in the oil chamber 152 and communicates with the bypass passage 210. The variable throttle device 142 is provided between the bypass passage 210 and the radial hole 212. Variable aperture device 1
42 is a stepped portion formed on the inner peripheral surface of the through hole 208;
The needle 220 moves toward and away from the stepped portion by moving in the through hole 208, and a moving device that changes the size of the gap between the stepped portion and the needle 220 by moving the needle 220 in the axial direction. Have. The moving device according to the present embodiment includes an adjusting screw 222 that is screwed into the valve body 170 and abuts on the needle 220 to regulate the axial position of the needle 220. The needle 220 is kept in contact with the adjusting screw 222 by the hydraulic pressure in the through hole 208. When oil flows through the bypass passage 210 and the radial hole 212, a flow resistance corresponding to the size of the gap between the stepped portion and the needle 220 is generated, and a damping force having an orifice characteristic is generated. Therefore, by changing the size of the gap between the stepped portion and the needle 220 (the flow passage area of the bypass passage 210), it is possible to control the damping force with respect to the oil flow rate (the operating speed of the shock absorber). In addition, as a moving device, various forms, such as a moving device provided with an electric motor and a feed screw, can be adopted.

The flow resistance applying device 6 constructed as described above
0, the operating speed of the shock absorbers 10 to 16 is low (the oil flow rate is low), and the leaf valve 1
Before the 40 is opened, the oil flows from the high-pressure chamber to the low-pressure chamber via the bypass passage 210, and a damping force having an orifice characteristic is generated. Shock absorber 10
When the operating speed of ~ 16 increases and the leaf valve 140 is opened, oil flows from the high pressure chamber to the low pressure chamber through both the path through the through hole 180 and the path through the through hole 182,
The damping force of the valve characteristic is generated.

The flow resistance applying device 26 provided in the shock absorbers 10 to 16 has the same configuration as the flow resistance applying device 60, and
40 and through holes 180 and 182 are provided in the piston 22, and a bypass passage 210 and a variable throttle device 142 are provided inside the piston rod 24.

Since the flow resistance applying device 86 has the same configuration as the flow resistance applying device 60, the same reference numerals are given and the description is omitted. Furthermore, the central twin cylinder 80
The only difference is that the space on the shaft portion 100 side of the pistons 96 and 98 in the twin cylinder body 90 of the front twin cylinder 54 is a gas chamber 230 filled with high-pressure gas, and the other portions are the same. Therefore, the same reference numerals are given and the description is omitted.

The flow resistance applying devices 82 and 84 have substantially the same configuration as the flow resistance applying device 60, and only different portions will be shown and described. The flow resistance applying device 8
2 and 84 have the same configuration, and therefore, the flow resistance applying device 82 provided on the left and right front wheel sides will be representatively shown and described. As shown in FIG. 3, the flow resistance applying device 82 is provided in the oil chamber 1 of the front twin cylinder 54 of the valve body 170.
In the side of the oil chamber 150 that communicates with the
A plate-like member 240 for closing the opening 182 is provided. The plate member 240 is a substantially inflexible disk, and the oil chamber 15 of the through hole 182 of the plate member 240 is formed.
A through hole 242 is formed in a portion corresponding to the 0-side opening. Therefore, in the flow resistance applying device 82,
The flow of oil from the oil chamber 152 to the oil chamber 150 is allowed only through the bypass passage 210, and a damping force having an orifice characteristic is always generated. On the other hand, the flow of oil from the oil chamber 150 to the oil chamber 152 is allowed only through the bypass passage 210 while the flow rate of the oil between the oil chamber 150 and the oil chamber 152 is small, so that the orifice characteristic is attenuated. A force is generated, but when the flow increases and the hydraulic pressure rises above the hydraulic pressure difference required to deflect the leaf 174 of the leaf valve 140, the leaf valve 140 is opened to allow oil flow,
The damping force of the valve characteristic is generated.

The above-described flow resistance applying devices 26 and 6
The damping characteristics of the damping forces generated at 0, 72, 82, 84 and 86 are appropriately set by freely setting the valve opening pressure of the leaf valve 140 and the throttle amount of the variable throttle device 142 as described above. Can be set. For example, it is possible to set the damping characteristics of the flow resistance applying device 26 as shown in FIG. 4 or the damping characteristics of the flow resistance applying devices 60 and 72 as shown in FIG. The damping characteristics of the resistance applying devices 82 and 84 can be set as shown in FIG. 6, and the damping characteristics of the flow resistance applying device 86 can be set as shown in FIG. In addition,
Flow resistance applying devices 82 and 8 having damping characteristics shown in FIG.
In No. 4, as a measure against the harsh, the damping force of the valve characteristics is set to be generated when the operating speed in the contraction direction of the shock absorber increases.

The operation of the vehicle damping device configured as described above during rolling, pitching, bouncing, and unsprung vibration of the vehicle body will be described. When the vehicle body rolls, for example, the left front wheel shock absorber 10 is contracted, and the right front wheel shock absorber 1 is contracted.
When the valve 2 is extended, oil flows from the oil chamber 28 to the oil chamber 30 in the shock absorber 10 and conversely from the oil chamber 30 to the oil chamber 28 in the shock absorber 12. A resistance is applied to the flow of the oil by the flow resistance applying device 26, and a damping force is generated. In addition, shock absorber 10
As much as the piston rod 24 of
Oil flows out of the oil chamber 28 to the outside, and the liquid passages 50,
It flows into the oil chamber 28 of the shock absorber 12 via the flow resistance applying device 60 and the liquid passage 52. At this time, a damping force is generated by the flow resistance applying device 60. The same also occurs in the left and right rear wheel shock absorbers 14 and 16, and the flow resistance applying device 26 and the flow resistance applying device 72 in the shock absorbers 14 and 16 generate a damping force against rolling.

When pitching the vehicle body, for example, if the left and right front wheel shock absorbers 10 and 12 are both contracted and the left and right rear wheel shock absorbers 14 and 16 are both extended, the oil chambers in the shock absorbers 10 and 12 are provided. Oil flows from the oil chamber 28 to the oil chamber 30 and from the oil chamber 30 to the oil chamber 28 in the shock absorbers 14 and 16, respectively. Therefore,
Similar to the rolling of the vehicle body, resistance is applied by the flow resistance applying device 26, and a damping force is generated. In addition, the oil chambers 28 of the shock absorbers 10 and 12
Flows through the liquid passages 50, 52, 76, 78, 66 and 68 to the oil chamber 28 of the shock absorbers 14 and 16, and flow resistance applying devices 82, 86 and 84 provided in the middle thereof. This produces a damping force against pitching.

At the time of bouncing the vehicle body, for example, if all of the shock absorbers 10 to 16 of each of the four wheels are contracted, oil flows from the oil chamber 28 to the oil chamber 30 in the shock absorbers 10 to 16, A damping force is generated by the flow resistance applying device 26. Further, oil flows from the oil chambers 28 of the shock absorbers 10 to 16 to the oil chambers 110 and 112 of the central twin cylinder 80, and the inflow of the oil is caused by the gas chamber 230.
Is allowed by shrinkage. As the oil flows from each oil chamber 28 into the central twin cylinder 80, a damping force is generated by the flow resistance applying devices 82 and 84.

In the case of unsprung vibration, for example, if the unsprung left front wheel vibrates, the shock absorber 10
The oil flows from the oil chamber 28 to the oil chamber 30 during contraction, and flows from the oil chamber 30 to the oil chamber 28 during expansion, and a damping force is generated by the flow resistance applying device 26 in each case. Further, the oil flows out or flows in through the liquid passage 50 as the piston rod 24 moves in and out of the cylinder body 20. The flow of the oil depends on the operating conditions of the other shock absorbers 12 to 16 in accordance with the flow resistance. The flow resistance is given by any of the applying devices 60, 72, 82, 84, 86, thereby also generating a damping force against the unsprung vibration. At this time, the left and right front wheels,
If the outflow of oil from the entire left and right rear wheel shock absorbers 10 to 16 is larger than the inflow of oil, the volume of the gas chamber 230 of the central twin cylinder 80 is reduced,
In the opposite case, the volume of the gas chamber 230 is increased, so that the inflow and outflow of the oil are respectively permitted.

As is clear from the above description, in this embodiment, the flow resistance applying device 26 constitutes an internal flow resistance applying device. The liquid passages 50 and 52 constitute a front connection passage, and the flow resistance applying device 60 constitutes a front flow resistance applying device. The connection member 102 is one form of a connection device. The liquid passages 66 and 68 constitute a rear connection passage, and the flow resistance applying device 72 constitutes a rear flow resistance applying device.
6, 78 constitute a central connection passage, and the flow resistance applying device 86 constitutes a central flow resistance applying device. Further, the flow resistance applying device 82 constitutes a front / center flow resistance applying device, and the flow resistance applying device 84 constitutes a rear / central flow resistance applying device.

According to the vehicle damping device of the present embodiment, it is possible to all reduce the rolling, pitching and bouncing of the vehicle body and to attenuate the unsprung vibration. The damping characteristics suitable for rolling, pitching, bouncing and damping of unsprung vibration are different from each other.
In the present embodiment, each flow resistance applying device 26, 6
By appropriately setting the damping characteristics of 0, 72, 82, 84, 86, rolling, pitching, bouncing and unsprung vibration of the vehicle body can be favorably attenuated.

Although one embodiment of the present invention has been described in detail, this is merely an example, and the present invention may be modified in various forms based on the knowledge of those skilled in the art. Can be implemented.

[Brief description of the drawings]

FIG. 1 is a diagram conceptually showing a vehicle damping device according to an embodiment of the present invention.

FIG. 2 is a front sectional view showing a front flow resistance applying device and a front twin cylinder of the damping device for a vehicle.

FIG. 3 is a front sectional view showing a part of a front / center flow resistance applying device of the vehicle damping device.

FIG. 4 is a diagram showing an example of a damping characteristic realized by a flow resistance applying device provided in a shock absorber of the vehicle damping device.

FIG. 5 is a diagram illustrating an example of a damping characteristic realized by the front flow resistance applying device and the rear flow resistance applying device.

FIG. 6 is a diagram showing an example of a damping characteristic realized by the front / center flow resistance applying device and the rear / center flow resistance applying device.

FIG. 7 is a diagram showing an example of a damping characteristic realized by a central flow resistance applying device of the vehicle damping device.

[Explanation of symbols]

10, 12, 14, 16: Shock absorber 2
6: Flow resistance applying device 28, 30: Oil chamber 50, 52: Liquid passage 5
4: Front twin cylinder 60: Flow resistance applying device 66, 68: Liquid passage 7
0: Rear twin cylinder 72: Flow resistance applying device 76, 78: Liquid passage 8
0: Central twin cylinder 82, 84, 86: Flow resistance applying device 92, 94: Cylinder 96, 98:
Piston 102: connecting member 110, 112, 1
14: Oil chamber 230: Gas chamber

Claims (1)

[Claims] A shock absorber provided between the left and right front wheels, the left and right rear wheels, and the vehicle body, and a front connection passage connecting oil chambers between the left front wheel shock absorber and the right front wheel shock absorber. A pre-flow resistance applying device that is provided on the way and provides flow resistance to the flow of oil from one of the oil chambers to the other; a pair of cylinders and a liquid-tight and slidably fitted to the pair of cylinders And a pair of pistons integrally connected by a connecting device, and one of two oil chambers formed on both sides of the pistons is provided on each side of the front flow resistance applying device in the front connection passage. Of the front twin cylinder, the other of which is connected to the other, and the left rear wheel shock absorber and the right rear wheel shock absorber A post-flow resistance applying device that is provided in the middle of the rear connection passage connecting the chambers and applies flow resistance to the flow of oil from one of the oil chambers to the other; A pair of pistons which are fitted tightly and slidably and are integrally connected by a connecting device, and one of two oil chambers formed on both sides of the pistons respectively has the rear connection passage. Are connected to both sides of the rear flow resistance applying device, and the other two cylinders are connected to each other, and the mutually connected oil chambers of the front twin cylinder and the rear twin cylinder are connected to each other. A central flow resistance providing device that is provided in the middle of the central connection passage that provides flow resistance to the flow of oil from one of the oil chambers to the other; And a pair of pistons which are liquid-tightly and slidably fitted to the pair of cylinders and are integrally connected by a connecting device, and the oil chambers formed on each side of the pistons are respectively A central connection passage connected to both sides of the central flow resistance applying device,
A central twin cylinder in which gas chambers formed on opposite sides are communicated with each other; and an oil between the oil chamber in the front twin cylinder and one of the two oil chambers in the central twin cylinder. Front / central flow resistance applying device for providing flow resistance to the flow of oil, and oil flow between the mutually connected oil chambers of the rear twin cylinder and the other of the two oil chambers of the central twin cylinder And a rear / central flow resistance applying device for applying flow resistance to the vehicle.