KR0178496B1 - Electric control system shock absorber - Google Patents

Abstract

The present invention relates to an electrically controlled shock absorber that rapidly attenuates an impact using an impact sensor of an airbag system. The present invention relates to a solenoid for operating a piston by receiving a current corresponding to a sensed impact amount, and to a downward movement of the piston. It consists of a plunger which actuates the valve spool. According to this configuration, it is possible to provide a shock absorbing device which is operated at substantially the same time as the impact of the road surface to quickly attenuate the shock to improve ride comfort.

Description

Electrically controlled shock absorber

1 is an operating system diagram of the electrically controlled shock absorber of the present invention.

Figure 2 is a cross-sectional view showing a part of the electrically controlled shock absorbing device of the present invention.

Figure 3 is an excerpt of the main portion illustrating the operating state of the shock absorbing device shown in FIG.

Figure 4 is an excerpt of the main portion of the shock absorber showing the state in which the operation of the solenoid in Figure 3 completed.

* Explanation of symbols for main parts of the drawings

10 solenoid 13 piston rod

14; Piston Valve 16: Push Rod

18: Fston 20: oil chamber

22: Plunger 26: Spool Valve

The present invention relates to a shock absorber using hydraulic pressure, and more particularly, to an electrically controlled shock absorber capable of rapidly attenuating a shock using a shock sensor used in a conventional airbag system.

As a device for alleviating the vibration transmitted from the road surface to the vehicle body, the vibration absorbing of the spring generated on the road surface is rapidly absorbed to improve the riding comfort and reduce the fatigue of the spring. There is a shock absorber generally called shock absorber. In a vehicle equipped with shock absorbers, there is an inverse relationship between ride comfort and steering stability. In other words, increasing the amount of shock absorption to improve ride comfort increases the vehicle's left and right vibrations, resulting in poor adjustment stability, while reducing the amount of absorption absorbed to improve opposing steering stability reduces the vehicle's left and right vibrations and front and rear vibrations. The ride comfort is reduced. Therefore, efforts have been made in the art to improve ride comfort and at the same time obtain excellent steering stability, and as a result of this effort, an automatic suspension has been disclosed that provides superior ride comfort and steering stability over conventional manual suspensions.

The conventional automatic suspension (active suspension) is composed of a sensor unit for detecting the state of the road surface, a control unit for supplying the hydraulic pressure by controlling it and an actuator operated by the hydraulic pressure. Actuators actuated by hydraulic pressure correspond to shock absorbers in conventional manual suspensions. This type of automatic suspension system uses the power generated by the engine, which consumes a lot of fuel, is bulky, and expensive, and can not react simultaneously with shocks. Have

Therefore, the present invention for solving the problems of the conventional automatic suspension device is an electric control type that can operate the shock absorber at the same time as the shock when a large shock is applied to the vehicle by using the shock sensor used in the airbag system To provide a shock absorbing device.

In order to achieve the above object, the present invention includes a piston rod fixed to a single function upper suspension arm and a piston valve installed at the other end; An outer cylinder moving longitudinally through a spline gear and having an inner cylinder having the piston rod therein, and an outer cylinder forming an oil reservoir together with the inner cylinder; An inner cylinder installed at a lower portion of the inner cylinder; In a shock absorber comprising a body valve for opening and closing the oil flow between the outer cylinder, the piston rod is installed on the piston rod and includes a shock absorbing means, the electrically controlled blow absorbing means is a push rod according to the amount of current transmitted from the outside A solenoid for actuating; A piston moved downward according to the action of the solenoid; A plunger moved downward by the operation of the fluid sent by the movement of the piston; It provides a shock absorbing device comprising a spool valve which is pushed downward by the plunger to open the oil passage.

Next, with reference to the drawings will be described a preferred embodiment of the present invention.

FIG. 1 is a system diagram in which a shock absorber of the present invention is connected to a conventional airbag system, and is transmitted to an electric control unit through a shock-adaptive airbag control module detected from a plurality of shock detection sensors installed on the front and side of the vehicle. The electric control unit sends a current equal to the amount of impact transmitted to the solenoid 10 (FIG. 2) in the shock absorbing device of the present invention to operate the shock absorbing device.

2 is a cross-sectional view showing a part of the shock absorbing device of the present invention in a pressurized state. As shown, the shock absorbing device of the present invention includes an outer cylinder 6 forming the oil storage chamber 2, a body valve 7 mounted on the lower end of the inner cylinder 8 and the inner cylinder 8, A normal piston valve 14 fixed to the lower part of the piston rod 12 and a spool valve 26 located above the piston valve 14 are included. The solenoid 10 which opens and closes the spool valve 26 is installed in the upper part of the spool valve 26 by receiving an electric signal from the electric control unit through the cable 9. Are controlled accordingly. Means for operating the spool valve 26 by the solenoid 10 includes a piston 18 which is moved downward by the projection of the push rod 16 fixed to the solenoid 10. An oil chamber 20 filled with oil is formed below the piston 18, and a plunger 22 which is moved downward by hydraulic pressure is provided between the oil chamber 20 and the spool valve 26.

In addition, the return spring 25 is fitted into the oil chamber 20 formed under the piston 18, and the return spring 27 is inserted into the hydraulic chamber 30 formed below the spool valve 26 to restore the restoring force. to provide. As shown, the check valve 35 is installed on the outer circumference of the piston rod 19, and when the solenoid 10 is operated, oil flows only from the oil chamber 20 toward the inner cylinder 8, and when released, By returning the oil into the oil chamber 20 by the action of the return spring inserted therein, the oil chamber 20 is always filled with oil, and at the same time, it quickly absorbs the oil and leaks the oil in the oil chamber 20. The residual pressure is maintained in the circuit to prevent vapor lock phenomenon.

When the piston rod 12 implemented in the present invention is connected to the upper suspension arm (not shown), the piston rod is divided into three parts, and the first piston rod 12 having the solenoid 10 embedded therein is formed on the upper portion. The second piston rod 19 is fastened to the first piston rod 12 by a screw portion 11 and includes a plunger 22 and a spool valve 26, and the second piston rod is screwed by a screw portion 21. It is connected to the (19) and can be divided into a third piston rod (29) having a conventional piston valve 14 is fixed to the outer circumference and the hydraulic passage 28 extending in the longitudinal direction in the inner center. A spline gear 38 having a plurality of holes 39 is fixed to the outer circumference of the first piston rod 12, which is engaged with the spline 40 formed in the inner cylinder 8 and moves in the longitudinal direction. The second piston rod 19 is provided with a plurality of oil passages 32 connected to the hydraulic chamber 30 in which the spool valve 26 is installed. In addition, many oil passages 42 are also formed in the normal piston valve 14 fixed to the lower end of the third piston rod 29. In the drawings, reference numeral 24 denotes a seal member that prevents leakage of oil.

Referring to Figure 3 will be described the operation principle of the electrically controlled shock absorber of the present invention configured as described above.

When a current corresponding to the amount of impact applied to the vehicle is transmitted to the solenoid 10, the push rod 16 protrudes downward in proportion to the magnitude of the transmitted current to push the piston 18 downward. As the piston 18 moves downward, the oil in the oil chamber 20 pushes the plunger 22 downward. In this case, since the cross-sectional area of the plunger 22 is smaller than the cross-sectional area of the oil chamber 20, the plunger The travel distance of 22 is significantly greater than the travel distance of the piston 18. Next, since the plunger 22 pushes the spool valve 26, a plurality of oil passages 32 formed on the second piston rod 19 are opened to discharge oil in the direction of the arrow, and the conventional piston valve 14 The oil is discharged in the direction of the arrow through the oil passage 42, thereby quickly damping the impact.

4 shows the operating state of the shock absorber according to the present invention after the shock is substantially attenuated. When the shock is removed and the supply of current to the solenoid 10 is cut off, the piston 18 and the push rod 16 are pushed upward by the action of the return spring 25. In addition, the spool valve 26 and the plunger 22 are also pushed upward by the action of the return spring 27 fitted into the hydraulic chamber 30 to return to the original position, so that the oil passage 32 is blocked, so that the oil is further removed. It will not flow anymore. At this time, the oil is filled in the oil chamber 20 by the action of the check valve 35 installed in the second piston rod 19 and a constant residual pressure is maintained in the circuit. Therefore, as described with reference to FIG. 3, the oil is discharged only through the oil passage 42 formed in the piston valve 14 to form a damping force.

According to the electrically controlled shock absorbing device of the present invention configured as described above, the spool valve is operated at substantially the same time as the shock according to the signal of the shock sensor, thereby rapidly attenuating the shock transmitted from the road surface, thereby improving the riding comfort. In addition, since the impact sensor for the existing airbag is used, the cost is not only reduced, but also has the advantage that the volume is smaller and the reaction time is shorter than that of the automatic shock absorber.

Claims (5)

A piston rod 12 having one end fixed to the upper suspension arm and the other end provided with a piston valve 14; An inner cylinder (8) in which the piston rod (12) moves longitudinally through the spline gear (38) and an outer cylinder (2) together with the inner cylinder (8) to form an oil reservoir (2); In the shock absorbing device is provided in the lower portion of the inner cylinder (8) consisting of a body valve (7) for opening and closing the flow of oil between the inner cylinder (8) and the outer cylinder (16), the piston rod (12) The shock absorbing device, characterized in that it comprises an electrically controlled shock-absorbing means which is installed in and operated in accordance with the amount of impact transmitted by the external shock sensing means to attenuate the shock quickly. According to claim 1, The electrically controlled shock absorbing means and the solenoid (10) for operating the push rod (16) in accordance with the amount of current transmitted from the outside; A piston 18 moved downward by the operation of the solenoid 10 and having a return spring 25 fitted therein; The plunger 22 is moved downward by the action of the fluid sent by the movement of the piston 18, and the oil passage 32 is opened by being pushed downward by the plunger 22 to open the return spring (27) Shock absorber comprising an inserted spool valve (26). The piston rod of claim 1 or 2, wherein the piston rod is connected to an upper suspension arm (not shown), and when the piston rod is divided into three parts, the solenoid 10 includes the first piston rod 12 embedded therein. The second piston rod 19 is fastened to the first piston rod 12 by a screw portion 11 formed at an upper portion thereof, and the plunger 22 and the spool valve 26 are embedded therein. It is connected to the second piston rod 19 and the outer circumferential portion is formed of a third piston rod 29 is fixed with a conventional piston valve 14 and the hydraulic passage 28 extending in the longitudinal direction in the inner center Shock absorber, characterized in that. The shock absorbing device according to claim 1 or 2, wherein the shock detection means is a shock detection sensor of an everback system, and the solenoid 10 operates the spool valve 26 in proportion to the transmitted shock amount. Device. The oil of claim 1 or 2, wherein, when the solenoid 10 is operated, oil passes only from the oil chamber 20 formed between the piston 18 and the plunger 22 toward the inner cylinder 8, When released, the shock absorber further comprises a check valve (35) for sending oil into the oil chamber (20) to maintain the residual pressure in the circuit.