KR20060100837A - Damping force adjusting device - Google Patents

Abstract

The present invention combines both the damping force characteristics for securing the ride comfort of the vehicle in a general commercial section, and the damping force characteristics for stably securing the attitude of the vehicle when a sudden load is applied, without additional devices such as electronic control equipment, etc. It is possible to provide a damper that effectively responds to a sudden change in attitude of the vehicle to secure a vehicle stability while providing a smooth and comfortable ride in a general commercial section.

Description

Damper damping force control device {DAMPING FORCE ADJUSTING DEVICE}

1 is a cross-sectional view of a piston showing the structure of a damper damping force control apparatus according to the present invention,

2 is a cross-sectional view taken along the line II-II of FIG. 1;

3 is an operation explanatory diagram of a damper for explaining the operation of the damper damping force control device of the present invention,

4 is a view showing the operation of the damper damping force control device compared with FIG.

 <Brief description of symbols for the main parts of the drawings>

One; Piston 3; Pressure chamber

5; Plunger 7; Orifice

9; Screen 11; spring

13; Piston rod 15; cylinder

17; Damper

The present invention relates to a damper damping force control device, and more particularly to a device for adjusting the damping force of the damper against a rapidly acting load.

In the case of a general damper, the damping force of the damper is controlled by using an orifice structure formed in the piston.

That is, an orifice is formed in the piston connected to the piston rod, and the damping force is generated between the piston rod and the cylinder while the fluid filled in the cylinder passes through the orifice during the relative movement of the piston and the cylinder.

Therefore, the damping force of the damper is approximately proportional to the relative speed of movement of the piston and the cylinder.

In the case of dampers used in a vehicle, damping force which is simply proportional to the relative movement speed of the piston and cylinder is useful in most general situations occurring while the vehicle is being driven, so that a smooth ride can be secured. In case of a sudden load such as an extreme roll of a vehicle body, a larger damping force is required. In such a situation, a damper having a simple orifice structure cannot provide adequate damping force.

The present invention combines both the damping force characteristics for securing the ride comfort of the vehicle in a general commercial section, and the damping force characteristics for stably securing the attitude of the vehicle when a sudden load is applied, without additional devices such as electronic control equipment, etc. It is an object of the present invention to provide a damper damping force control device that effectively responds to a sudden change in attitude of a vehicle and provides a smooth and comfortable ride comfort in a general commercial section while securing vehicle stability.

The damper damping force control device of the present invention for achieving the above object is

A pressure chamber formed in the piston having an opening opened in one of the direction of movement of the piston;

A plunger provided in the piston to linearly slide in a direction perpendicular to the direction of movement of the piston under pressure of the pressure chamber;

A screen connected to the plunger so as to reduce the flow cross-sectional area of the orifice of the piston by linear movement;

A spring installed to elastically support the plunger with the screen opening the orifice;

Characterized in that configured to include.

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

For reference, the damper damping force adjusting device of the present invention may be applied to a piston in which only a simple orifice is formed, and as shown in FIG. 1, the piston 1 includes a valve spring of a plate spring type according to a conventional general technique. Further applicable to the installed structure, the valve structure according to the conventional general technique is indicated by an X in the figure.

1 and 2, an embodiment of the present invention includes a pressure chamber 3 formed in the piston 1 having an opening that is open in any one direction of the movement direction of the piston 1; A plunger (5) provided in the piston (1) so as to receive a pressure of the pressure chamber (3) to linearly slide in a direction perpendicular to the direction of movement of the piston (1); A screen 9 connected to the plunger 5 so as to reduce the flow cross-sectional area of the orifice 7 of the piston 1 by linear movement; The screen 9 is configured to include a spring 11 installed to elastically support the plunger 5 in a state in which the orifice 7 is opened.

The pressure chamber 3 is formed in the direction in which the opening of the pressure chamber 3 is formed at the time of bump, that is, when the load acts in a direction in which the entire length formed by the piston rod 13 and the cylinder 15 is shortened. Is formed in the direction in which the pressure rises, the opening is formed downward in FIG.

In this embodiment, the pressure chamber 3 is formed in the center of the piston 1, the plunger 5 is installed on both sides of the pressure chamber 3, respectively, and the screen 9 is the plunger ( 5) is formed in a size and shape that can completely block the orifice (7) in the state moved to the maximum.

The spring 11 is installed between the protrusion and the plunger 5 formed in the pressure chamber 3, respectively, so that the plungers 5 can exert an elastic force to be pulled toward the pressure chamber 3.

Referring to the operation of the present invention configured as described above are as follows.

As shown in FIG. 3, when the piston 1 and the piston rod 13 descend, the piston 1 rises relatively, and the pressure rises between the lower side of the piston 1 and the cylinder 15. In the case where the relative speed between the piston 1 and the cylinder 15 is equal to or greater than the set speed, the screen 9 reduces the flow cross-sectional area of the orifice 7 to rapidly increase the damping force of the damper 17.

Here, the “set speed” refers to a speed at which the vehicle to which the damper 17 is applied causes a sudden roll of the vehicle body or a sharp rise of the wheel, resulting in unstable posture of the vehicle. It may be made by adjusting the elastic force of the spring (11).

4 shows that the piston 1 and the cylinder 15 move above the speed set by the rapid relative movement, so that the pressure in the pressure chamber 3 moves the plungers 5 so that the screen 9 The state which reduces the flow cross-sectional area of the orifice 7 is shown.

When the flow cross-sectional area of the orifice 7 is actively reduced in this way, the damping force generated by the damper 17 is increased rapidly, and in particular, the screen (1) by the very rapid relative movement of the piston 1 and the cylinder 15 When 9) completely blocks the orifice 7, the damper 17 is converted into a kind of hydraulic spring so that the vehicle body can be stably supported.

When the relative movement speed of the piston 1 and the cylinder 15 decreases and the pressure of the pressure chamber 3 drops, the plunger 5 causes the screen 9 to be orificed by the elastic force of the spring 11. 7) is moved so as not to obscure.

Of course, in the normal commercial section, the pressure in the pressure chamber 3 is not sufficiently raised, so that the plunger 5 does not reduce the flow cross-sectional area of the orifice 7 to the screen 9, so that the piston 1 By exhibiting the damping force characteristics by only the orifice (7) formed in the or the valve structure according to the conventional general technique, it is possible to form a smooth and comfortable ride.

As described above, according to the present invention, the electronic control equipment combines both the damping force characteristics for securing the ride comfort of the vehicle in a general commercial section and the damping force characteristics for stably securing the attitude of the vehicle when a sudden load is applied. It is possible to provide a damper that effectively responds to a sudden change in attitude of a vehicle without additional devices such as to provide a smooth and comfortable ride comfort in a general commercial section while ensuring the stability of the vehicle.

Claims (2)

A pressure chamber formed in the piston having an opening opened in one of the direction of movement of the piston; A plunger provided in the piston to linearly slide in a direction perpendicular to the direction of movement of the piston under pressure of the pressure chamber; A screen connected to the plunger so as to reduce the flow cross-sectional area of the orifice of the piston by linear movement; A spring installed to elastically support the plunger with the screen opening the orifice; Damper damping force control device characterized in that configured to include. The method of claim 1, The pressure chamber is formed at the center of the piston; The plungers are respectively installed on both sides of the pressure chamber; The screen is formed in a size and shape that can completely block the orifice when the plunger is moved to the maximum Damper damping force control device characterized in that.

Images