KR100320537B1 - Suspension of anti-dive control system for vehicles - Google Patents

Abstract

In order to provide an anti-dive control device for a vehicle suspension that enables mechanical anti-dive control by braking hydraulic pressure during vehicle braking, which can lower the cost.

A control valve connected to the front brake hydraulic line to open and close by the brake hydraulic pressure when the vehicle is suddenly braked; An air chamber mounted between each of the front shock absorbers and the suspension springs, the high pressure gas being pressurized when the control valve is opened to suppress the noise dive of the front suspension; An anti-dive control device for a vehicle suspension including an air tank connected to an air chamber and an air supply line to supply high pressure gas to the air chamber when the control valve is opened.

Description

Anti-dive control device for vehicle suspension {SUSPENSION OF ANTI-DIVE CONTROL SYSTEM FOR VEHICLES}

The present invention relates to an anti-dive control device for a vehicle suspension, and more particularly, to an anti-dive control device for a vehicle suspension that can reduce the cost by enabling anti-dive control of the suspension mechanically using brake hydraulic pressure. will be.

In general, the vehicle suspension is located in the middle of the axle shaft and the vehicle body to absorb the impact from the road surface to serve to improve the ride comfort.

Anti-dive control that prevents noise dive during sudden braking of the vehicle and rolls during the vehicle's turning by causing various effects such as adjustment, stability, and ride comfort of the vehicle according to any geometric change when the suspension moves up and down. Anti-roll control for suppressing noise, anti-shift control for suppressing vehicle vibration by increasing damping force when body vibration occurs.

FIG. 6 is a block diagram illustrating the anti-dive control electronically. The brake light switch sensor 102 detects whether the vehicle is braked, the vehicle speed sensor 104 that detects the traveling speed of the vehicle, and the respective sensors. The ECU (electronic control unit) 106 which receives the signals of 102 and 104, the actuator 108 driven by this ECU 106, and the damping force are actuated by operation of this actuator 108 The shock absorber 110 is included.

Referring to the electronic anti-dive control process, braking is detected by the brake light switch sensor 102 and the vehicle speed sensor 104 when the vehicle suddenly brakes, and the ECU 106 drives the actuator 108 by the detected signal. In addition, the actuator 108 increases the damping force of the shock absorber 110 to suppress the noise dive phenomenon of the vehicle, thereby improving maneuverability and stability.

However, the electronic anti-dive control made as described above requires an actuator for the operation of each sensor and shock absorber as well as a cost increase because the structure of the shock absorber in which the damping force is added or decreased by driving the actuator is complicated. There is this.

SUMMARY OF THE INVENTION The present invention was created to solve the above problems, and an object of the present invention is to provide an anti-dive control device for a vehicle suspension that can mechanically enable anti-dive control by brake hydraulic pressure during vehicle braking, thereby reducing the cost. To provide.

1 is a block diagram of a vehicle suspension anti-dive control device according to the present invention.

2 is an enlarged cross-sectional view of a control valve according to the present invention;

Figure 3 is an operating state of the control valve according to the present invention.

4 is a cross-sectional view of the air chamber mounted to the shock absorber according to the present invention.

5 is a block diagram of a vehicle suspension anti-dive control device according to the prior art.

In order to achieve the above object, the anti-dive control device for a vehicle suspension of the present invention is connected to a front brake hydraulic line that opens and closes by brake hydraulic pressure when the vehicle is braked, and an upper end thereof is opened, and one side of the front brake hydraulic line. A piston which is connected to the valve case, is mounted to the inner periphery of the valve case so as to be movable upward and downward, and forms a hydraulic chamber in which brake hydraulic pressure is press-fitted between the valve case and an upper end thereof, and is connected to a lower end of the piston. Opening and closing means for simultaneously performing the opening and closing action of the air supply line penetrating the lower side of the valve case and the opening and closing action of the air discharge line penetrating perpendicularly to the lower side of the valve case while moving up and down, the piston and the Mounted between the inner bottom of the valve case and the A control valve made of an elastic member for returning the piston to its original position; When the control valve is opened, the shock absorber passes through the inner circumference while the high pressure gas is press-fitted and mounted between the front shock absorber and the suspension spring, respectively, to suppress the noise dive of the front suspension. An air chamber in which a pleat is formed of a rubber material to be sandwiched therebetween, the air chamber being mounted on one side of the air supply line and on which the air discharge line is mounted; And an air tank connected to an air chamber supplying a high pressure gas required for the air chamber and an air supply line when the control valve is opened, and always filling a constant high pressure gas by an air compressor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a mechanical anti-dive control device of a suspension according to the present invention, which is connected to the front brake hydraulic line 2 and controls the valve 4 to open and close by brake hydraulic pressure, and the control valve 4. And an air chamber (8) connected to an air line and mounted on the shock absorber (6) to adjust damping force, an air tank (10) for storing and supplying high pressure gas required for the air chamber (8), and an air tank (10). Air compressor 12 for generating a high pressure gas required for).

The anti-dive control device is mounted on both sides of the front suspension, respectively.

The control valve 4 is connected to one side of the hydraulic line 2 for supplying hydraulic pressure to the front brake, connected to the air tank 10 side and the air supply line 14, the air chamber 8 side and It is connected to the air supply line 14 and the air discharge line (16).

2 is a cross-sectional view showing the internal structure of the control valve, the upper end of the valve case 20 is connected to one side of the hydraulic line 2 and the three-way connector 18, and the inside of the valve case 20 And a piston 22 which is mounted to be movable up and down, and these opening and closing means integrally connected to the lower end side of the piston 22 to open and close the valve.

The valve case 20 is formed with a hydraulic chamber 24 through which the hydraulic pressure is pushed in between the piston head to the upper inner side, and the air supply connected to the air tank 10 side and the air chamber 10 side to the lower inner side. The sphere 64 and the air discharge port 28 through which the high pressure gas on the side of the air chamber 8 are discharged are formed.

The piston 22, which is in close contact with the inner circumference of the valve case 20 and moves up and down, is mounted with an outer circumference thereof with a piston ring 30 for sealing between the inner wall of the valve case 20 and the lower end side. Opening and closing means is connected to.

In addition, an elastic member 32 is interposed between the lower end side of the piston 22 and the lower inner periphery of the valve case 20 to serve as a return spring for returning the piston 22 to its original position after operation.

The elastic member 32 is set to a constant spring constant such that the elasticity can be overcome only by the hydraulic pressure during the rapid brake operation of the vehicle.

The opening and closing means is formed through a predetermined position of the piston rod 34 of a predetermined length connected in a vertical direction with the piston 22, the connection hole 36 for opening and closing the air supply line 14 and the piston It is formed on the end of the rod 34 is made of a needle (38) for opening and closing the air discharge line, the opening and closing operation of the air supply line and the air discharge line is made at the same time in accordance with the vertical movement of the piston rod.

3 is a cross-sectional view showing the operating state of the control valve, when the hydraulic pressure is supplied to the hydraulic chamber 24 to the hydraulic line during braking of the vehicle, the piston 22 overcomes the elasticity of the elastic member 32, As shown in the figure, when the piston rod 34 moves downward, the connecting hole 36 connects the air supply port to supply air, and the needle 38 is connected to the valve seat of the air outlet port. In close contact with 40, the air discharge line 16 is blocked.

4 is a cross-sectional view of the air chamber mounted to the shock absorber, in which an air supply line 14 connected to the control valve 4 and an air discharge line 16 are connected.

The air chamber 8 is formed between the outer circumference of the shock absorber 6 and the inner side of the suspension spring 42, which serves to cushion the vibration, that is, formed in a cylindrical shape, and the shock absorber has an inner circumference ( 6) passes, and the suspension spring 42 is mounted on the outer circumference.

The air chamber 8 is a highly elastic, durable rubber chamber, the outer periphery mounted on the suspension spring 42, the corrugation 44 is formed so as to fit in the space side between the gap of the suspension spring. do. In other words, the suspension spring 42 is tightened to the outer periphery of the air chamber (8).

The air chamber 8 configured as described above prevents the contracting action of the suspension spring mounted to the outer circumference when the high pressure gas is pressed into the air supply line 14. That is, the high pressure air is pressed into the space between the suspension springs 42 to prevent the suspension springs 42 from being compressed.

Then, when the air is discharged to the air discharge line 14, the suspension spring 42 performs the original compression and relaxation action.

Mechanical anti-dive control device for a vehicle suspension made as described above, when the hydraulic pressure is supplied to the hydraulic chamber 24 side of the valve case in the hydraulic line (2) side connected to the front brake during braking of the vehicle piston 22 is Overcoming the elasticity of the elastic member 32, and moves to the lower side, at this time, the piston rod 34 connected to the lower side of the piston 32 connects the air supply line 14 and at the same time the air discharge line 16 By blocking the high pressure gas in the air tank 10 is supplied to the air chamber 8 side through the air supply line (14).

Accordingly, the air chamber 8 blocks the compression action of the front suspension spring 42 to suppress the noise dive phenomenon of the front suspension, thereby preventing the vehicle from tipping forward.

As described above, the anti-dive control device for a vehicle suspension according to the present invention can reduce the cost by enabling anti-dive control mechanically using brake hydraulic pressure.

Claims (4)

The upper side is opened while being connected to the front brake hydraulic line that opens and closes by brake hydraulic pressure when the vehicle brakes rapidly, and is mounted to the valve case connected to one side of the front brake hydraulic line and vertically movable on the inner circumference of the valve case. Opening and closing the piston, which forms a hydraulic chamber through which the brake hydraulic pressure is press-fitted between the valve case and the upper end side, and is connected to the lower end side of the piston to move up and down, through the lower side of the valve case. Opening and closing means for simultaneously performing an opening and closing action of an air discharge line penetrating perpendicularly to the lower side of the valve case, and an elastic member mounted between the piston and an inner lower end of the valve case to return the piston to its original position. A control valve made of a member; When the control valve is opened, the shock absorber passes through the inner circumference while the high pressure gas is press-fitted and mounted between the front shock absorber and the suspension spring, respectively, to suppress the noise dive of the front suspension. An air chamber in which a pleat is formed of a rubber material to be sandwiched therebetween, the air chamber being mounted on one side of the air supply line and on which the air discharge line is mounted; An air tank connected to an air chamber for supplying high pressure gas to the air chamber and an air supply line when the control valve is opened, and always filling a constant high pressure gas with an air compressor; Control unit. The method according to claim 1, The piston is an anti-dive control device for a vehicle suspension, characterized in that the piston ring is mounted on the outer circumference so as to seal the inner wall of the valve case. The method according to claim 1, The opening and closing means is vertically connected to the lower end side of the piston is connected to the opening hole of the air supply line to the predetermined position of the piston rod moving up and down like the piston penetrates the predetermined position of the rod in the horizontal direction; And needles, which are in contact with a valve seat formed at one side of the air discharge line, to open and close the air discharge line, are formed at the end of the piston rod. The method according to claim 1, The elastic member is an anti-dive control device for a vehicle suspension, characterized in that the spring constant is set so that it can only be compressed by the abnormal brake hydraulic pressure generated during rapid braking.

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