KR20040010940A - Pump for hydraulic control unit - Google Patents

Abstract

PURPOSE: A pump of a hydraulic control unit is provided to prevent surging by adopting a driving member having plural protruded bent surfaces and recessed bent surfaces and to reduce driving power of a motor and hydraulic wave pressure. CONSTITUTION: A pump of a hydraulic control unit comprises a driving member, a driving transmission member(15), a piston(11), a pump cylinder(12), a suction valve(17), an inner chamber(13), and a discharge valve(24). The driving member rotates by a rotating shaft(54) fastened to a driving motor, and the driving transmission member rectilinearly reciprocates according to the rotary motion of the driving member. One side of the driving transmission member comes in contact with the driving member and the other side of the driving transmission member is fastened to one side of the piston. The driving member forms plural protruded bent surfaces(52) and recessed bent surfaces around a cylinder.

Description

Pump of hydraulic control unit {PUMP FOR HYDRAULIC CONTROL UNIT}

The present invention relates to a pump of a hydraulic control unit, and more particularly, to a pump of a hydraulic control unit, characterized in that the shape of the driving member of the pump includes a plurality of protruding bent surfaces and recessed bent surfaces around the cylinder.

In a vehicle brake system such as an automobile, it is equipped with a negative pressure boosting device for boosting the brake pedal force to obtain a large brake force, and the wheels are locked when the vehicle is braked, so that the steering becomes unstable and the stopping distance becomes long. Various brake systems including ABS, TCS, and ESP have been proposed. And one of the conventional ABS, TCS ESP is a return pump type ABS, TCS, ESP.

The pump of the hydraulic control unit, which is one component of the return pump type ABS, TCS, and ESP, is shown in FIG. 1. The pump 10 of the hydraulic control unit shown in FIG. 1 includes a piston 11. The piston 11 is guided so as to slide longitudinally in the pump cylinder 12 having the inner chamber 13. The piston 11 is driven against the spring force of the compression spring 16 provided in the inner chamber 13 by the eccentric drive member 14. The piston 11 cooperates with the suction valve 17 provided in the inner chamber 13. The piston 11 is provided with a suction passage 18 extending in the longitudinal direction, and the suction passage is connected with an inlet passage 19 for a pressure medium.

From the inner chamber 13, the outlet 22 extends coaxially with respect to the pump cylinder 12, and the outlet 22 ends in an annular valve seat 23 provided in the outlet valve 24. This valve seat 23 cooperates with the valve blocking member 25. The valve blocking member 25 is housed in a hollow chamber 26 in a cylindrical cross section, which hollow chamber 26 starts coaxially with respect to the longitudinal axis of the pump and starts from the valve seat 23 and pump cylinder 12. Installed in The hollow chamber 26 is provided coaxially to the cylinder head 27 joined to this pump cylinder 12 on the opposite side to the drive member 14 of the pump cylinder 12. The hollow chamber 26 has a closing spring 28 on the side opposite to the valve seat 23, which presses the valve blocking member 25 in the direction of the valve seat 23. On the downstream side of the valve seat 23, the outlet 30 connected to the outlet passage 29 for the pressure medium branches laterally in the hollow chamber 26.

Hereinafter, the operation of the pump of the hydraulic control unit will be described.

As the eccentric cam-shaped drive member 14 rotates, the drive transmission member 15 installed in contact with the drive member 14 performs a linear reciprocating motion. The linear reciprocating motion of the drive transmission member 15 is transmitted to the piston 11 that is coupled to the drive transmission member.

When the piston 11 strokes downward, the suction valve 17 is opened so that the pressure medium passes through the inlet passage 19 and the suction passage 18 and is accommodated in the inner chamber 13. During the intake stroke, the outlet valve 24 is closed. On the other hand, in the upstroke (working stroke) of the piston 11, the intake valve 17 is closed, and the pressure medium is discharged from the outlet 22, the discharge valve 24, and the outlet 30 in the inner chamber 13. Extruded through the outlet passage 29 through.

The conventional pump driven by the cam-shaped driving member 14 has a problem in that the instantaneous discharge amount is high and the hydraulic pressure change is large, thereby causing a high hydraulic wave to be generated and pulsation occurs. In addition, continuous shock is applied to the pump housing due to continuous high hydraulic wave and fatigue failure is generated. Therefore, high rigidity is required in the pump housing, and instantaneous torque is generated, requiring high power to the motor driving the drive member. Done.

Accordingly, the present invention has been invented to solve the above problems, the object of the present invention is to adopt a drive member of a shape having a plurality of protruding bent surface and depression bent surface to prevent pulsation phenomenon and drive power of the motor It is to provide a pump of the hydraulic control unit to reduce the hydraulic wave pressure.

1 is a cross-sectional view of a conventional hydraulic control unit pump.

2 is a cross-sectional view of one embodiment according to the present invention.

Figure 3a is a graph of the discharge amount of the conventional hydraulic control unit pump and the rotation angle of the drive member.

Figure 3b is a graph of the discharge amount and the rotation angle of the drive member according to the invention.

* Description of the symbols for the main parts of the drawings *

10 pump 11 piston

12: pump cylinder 13: internal chamber

14: drive member 15: drive transmission member

16: compression spring 17: suction valve

19: entrance passage 22: outlet

23: valve seat 25: valve blocking member

26: hollow chamber 27: cylinder head

28: closed spring 29: exit passage

30: exit

The present invention for achieving the above object is a rotational movement is located under the cylinder of the pump and the driving portion in contact with the drive transmission member, one side is in contact with the drive and the other side is the drive transmission member in contact with one side of the piston And a pump cylinder, a cylinder inner chamber, a discharge valve and a suction valve, and the driving unit provides a pump of a hydraulic control unit having a plurality of protruding bent surfaces and recessed bent surfaces around the cylinder.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.

2 is a cross-sectional view of one embodiment according to the present invention. As shown, the present embodiment includes a drive member 14, a drive transmission member 15, a piston 11, a pump cylinder 12, an intake valve 17, an inner chamber 13, and a discharge valve 24. Is done.

The drive member 14 is rotated by a rotation shaft 54 fastened to a drive motor (not shown), and the drive transmission member 15 in contact with the drive member 14 is in accordance with the rotational motion of the drive member. Do a straight reciprocating exercise.

As shown in the drawing, when the drive transmission member 15 contacts the recessed bent surface 51 of the drive member, the piston 11 strokes downward, and the suction valve 17 is opened so that the pressure medium is connected to the inlet passage 19. Passed through the suction passage 18 is accommodated in the interior chamber (13). During the intake stroke, the outlet valve 24 is closed.

On the other hand, when the drive transmission member 15 contacts the protruding bent surface 52 of the drive member 14, the drive transmission member moves upwards, so that the piston travels upward (working stroke). At this time, the intake valve 17 is closed, and the pressure medium is extruded from the inner chamber 13 to the outlet passage 29 via the outlet 22, the discharge valve 24, and the outlet 30.

By repeating the above process, the pump 10 for the hydraulic control unit is operated.

3 is a graph of the pump of the conventional hydraulic control unit and the discharge amount of the present invention. The graph shows the discharge amount according to the rotation angle of the drive member 14. The discharge amount per revolution in Figs. 3A and 3B is the same. However, as shown in FIG. 3A, the conventional pump has a large variation in the discharge amount according to the rotation angle of the driving member. However, as shown in FIG. 3B, the present invention has a small variation in the discharge amount by discharging the small discharge amount several times. Therefore, the present invention prevents the pulsation generated by the high hydraulic wave.

The present invention adopts the shape of the drive member in a shape having a plurality of protruding bent surface and the depression bent surface around the cylinder to reduce the instantaneous discharge amount to reduce the amount of change in the hydraulic pressure. Therefore, it has an effect of preventing the pulsation phenomenon that occurred in the conventional pump.

It also reduces the continuous high pressure wave, which reduces the impact transmitted to the pump housing, thereby reducing the occurrence of fatigue failure. And since the required torque is reduced, the high-power drive motor required in the conventional pump is not required.

Claims (1)

A hydraulic member including a driving member which rotates and is located on the side of the cylinder, one side of which is in contact with the driving member, and the other side of which is coupled to one side of the piston, a pump cylinder, an inner cylinder of the cylinder, a discharge valve and a suction valve. In the pump of the control unit, The driving member is a pump of a hydraulic control unit, characterized in that it has a plurality of protruding bent surface and recessed bent surface around the cylinder.