KR101604956B1 - Piston pump having a backflow prevention feature - Google Patents

Abstract

The present invention relates to a piston pump having a counterflow prevention function, more specifically to a piston pump comprising: modulator blocks formed in an ABS side and an ESC side, respectively to have a first inlet and a second inlet through which oil flows in and an outlet through which the flew oil is discharged; a pump room arranged inside the modulator blocks; a piston reciprocally moving inside the pump room; and a pump filter filtering foreign substances from the oil flew into the pump room, wherein oil inlet locations of the first inlet and the second inlet are separated apart at a predetermined distance; a counterflow prevention unit to make the oil flew through the first inlet pass and prevent the oil flew into the pump room from counterflow into the first inlet; and a clean ball to make the oil remaining in the counterflow unit move. The piston pump of the present invention is able to act as a check valve by making the oil flew into the pump room through the first inlet pass and preventing the oil in the pump room from counterflow into the first inlet using the counterflow prevention unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a piston pump having a backflow prevention function,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston pump provided with a backflow prevention function, and more particularly, to an improvement in productivity by eliminating a check valve by providing an outside surface of a pump filter provided in a piston and a backflow preventing portion, To a piston pump provided with a backflow prevention function.

In general, electronic stability control (ESC) is a device that allows a driver to maintain a lane without sudden steering loss and steering ability when driving on curved roads.

This body posture control system combines and improves anti-lock braking system (ABS) and traction control system (TCS) and is an advanced braking system which is widely used recently. A piston pump for ESC is provided.

The piston pump for ESC performs the function of reducing pressure by introducing oil on the wheel cylinder side of the wheel, or absorbing oil on the master cylinder side.

1 is a view showing a part of a hydraulic path in a modulator block of a conventional body control device, and Fig. 2 is a schematic view showing a conventional piston pump.

1, the modulator block of the vehicle body control device includes an accumulator 3 for temporarily storing the oil that has moved through the oil passage to reduce the pressure on the wheel cylinder 2 side of the wheel, A high pressure actuation valve 6 which is opened and closed to control the oil movement of the accumulator 3 and a high pressure actuation valve 6 and a piston pump in which an inlet for introducing the oil introduced through the accumulator 3 and the high pressure actuation valve 6 is formed, 8) and a check valve (not shown) provided at the outlet of the accumulator 3 to prevent the oil from flowing into the accumulator 3 side during the ESC increase and to maintain the pressure difference between the piston pump 8 and the wheel cylinder 2 at about 1 bar 10 are provided. Here, the movement path of the oil indicated by the solid line is the oil flow at the time of ESC increase, and the movement path of the oil indicated by the dotted line is the oil flow at the ABS operation.

2, the piston pump 8 is provided with a piston 12, which is operated in the pump chamber by the operation of a motor (not shown) and in which a space for allowing oil to flow therein is formed, A disk blocking plate 18 which is supported by elasticity and discharges the oil by the pressure of the oil moved through the space of the piston 12, and a piston 12 And a guide member 19 for guiding the piston 12 is provided.

However, since the existing technology must have a check valve, parts for check valves such as a valve housing, a spring, a stopper and a ball for assembling the check valve are manufactured, and the pump housing is manufactured There is a problem that the process becomes complicated.

Further, there is a problem in that productivity is deteriorated because a separate process such as a tool or equipment for assembling the check valve to the pump housing is required.

In order to solve the above-described problems, a piston pump having a check valve function is disclosed in Japanese Patent Application Laid-Open No. 10-2013-0051377.

The piston pump having the check valve function includes a modulator block having a first ABS inlet and an ESC second inlet, a pump chamber formed in the modulator block, a piston reciprocating in the pump chamber, A pump filter for filtering out foreign substances from the oil, and a backflow preventing portion provided on an outer periphery of the piston and preventing the oil flowing in the first inlet from flowing back to the ABS, It is possible to eliminate the valve, thereby reducing the number of parts and improving the productivity.

However, the above-mentioned prior art is not suitable. There is a problem that oil is prevented from flowing back to the first inlet side by the backflow preventing portion but there is a limit that the oil remains inside the backflow preventing portion and there is a problem that internal components may be corroded by the remaining oil.

KR 10-2013-0051377 A (2013. 05.20)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and a problem to be solved by the present invention is to provide a backflow preventing function, which prevents oil in a pump chamber from flowing into a first inlet, To provide a piston pump.

Another object of the present invention is to provide a piston pump provided with a backflow prevention function capable of preventing the oil from being pushed out by causing the oil remaining in the backflow preventing portion to flow by the clean ball.

In order to achieve the above object, the piston pump provided with the backflow prevention function of the present invention is formed on the side of an anti-lock brake system (ABS) and a traction control system (TCS) A modulator block having a first inlet and an inlet for introducing the oil and an outlet for discharging the oil introduced through the first inlet and the second inlet, a pump chamber provided in the modulator block, The first inlet and the second inlet are arranged such that the inflow position of the oil introduced into the pump chamber is shifted by a predetermined distance from the first inlet and the second inlet, And the oil flowing into the pump chamber through the first inlet port is formed on the outside of the pump filter, Said backflow prevention unit is an oil flowing into the pump chamber to be prevented is that the reverse flow to the first inlet; And a clean ball for allowing the oil remaining in the backflow prevention portion to flow.

The pump filter may include: a housing having a cylindrical shape surrounding the piston; And a filter member provided in the housing to filter foreign substances from the oil flowing into the pump chamber.

In addition, the backflow prevention portion is provided in the housing of the pump filter so that the oil introduced from the first inlet is allowed to flow outside the inclined surface, and the oil flowing backward from the pump chamber is prevented from being trapped by the inside of the engagement jaw .

Also, the clean ball flows along the circumferential direction of the housing from the inside of the stopping jaw of the backflow prevention part to allow the oil of the backflow prevention part to flow.

According to the present invention, the oil flowing into the pump chamber through the first inlet port is allowed to pass through the backflow preventing section, and the oil in the pump chamber can be prevented from flowing back to the first inlet port, .

Further, according to the present invention, it is possible to prevent the reverse flow of the oil in the state where the check valve is not provided, so that it is possible to reduce the number of parts by eliminating the check valve, thereby reducing manufacturing cost.

Further, according to the present invention, since the manufacturing process is relatively simplified due to the elimination of the check valve, the productivity can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a part of a hydraulic path in a modulator block of a conventional body control device. FIG.
2 is a schematic view showing a conventional piston pump;
3 is a view showing a part of a hydraulic path in a modulator block of a vehicle body control apparatus according to the present invention.
4 is an enlarged view of a piston pump provided with a backflow prevention function according to the present invention.
5 is a view showing a backflow prevention portion of a piston pump provided with a backflow prevention function according to the present invention.
6 is a perspective view showing a pump filter of a piston pump provided with a backflow prevention function according to the present invention.

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

The present invention relates to a piston pump provided with an anti-reverse flow function that improves productivity by eliminating a check valve by providing an outer surface of a pump filter provided in a piston and a backflow preventing portion for preventing reverse flow of oil to the inner surface of the pump chamber.

FIG. 3 is a view showing a part of a hydraulic path in a modulator block of a vehicle body control apparatus according to the present invention, FIG. 4 is an enlarged view showing a piston pump provided with a backflow prevention function according to the present invention, FIG. 6 is a perspective view showing a pump filter of a piston pump provided with a backflow prevention function according to the present invention. FIG. 6 is a perspective view showing a backflow prevention part of a piston pump having a backflow prevention function.

3 to 6, the piston pump 100 of the present invention includes a modulator block 110, a pump chamber 120, a piston 130, a pump filter 140, a backflow prevention portion 160, (170).

The modulator block 110 is formed on the side of a first inlet 111 and a traction control system (TCS), which are formed on the anti-lock brake system (ABS) A second inlet 112 through which the oil flows and an outlet 113 through which the oil introduced through the first inlet 111 and the second inlet 112 are discharged.

The oil supplied from the wheel cylinder 2 of the wheel flows into the first inlet 111 through the accumulator 3 and the oil supplied from the master cylinder 4 flows into the second inlet 112 through the high- (6).

The first inlet 111 and the second inlet 112 are formed such that the inflow position of the oil introduced into the pump chamber 120 is shifted by a predetermined distance d. More specifically, the first inlet 111 is formed around the lower periphery of the pump filter 140, and the second inlet 112 is formed around the upper periphery of the pump filter 140.

The pump chamber 120 is provided inside the modulator block 20. The pump chamber 120 may store oil flowing through the first inlet 111 and the second inlet 112.

The piston 130 is reciprocated in the pump chamber 120 and is provided at one side with a driving motor (not shown) for providing a driving force required for the reciprocating movement of the piston 130. The piston 130 is formed with a space 131 through which the oil introduced through the first inlet 111 and the second inlet 112 is transferred and the space 131 is communicated with the pump chamber 120 .

The piston pump 100 of the present invention is further provided with a disk blocking plate 190 for supporting the oil moved through the space 131 of the piston 130 by the elasticity of the spring 191.

According to the present invention, since the disk blocking plate 190 supports the oil moved from the space 131 of the piston 130 by the elastic force of the spring 191, the reciprocating motion of the piston 130 The oil introduced into the pump chamber 120 is pressurized by the oil pressure from the space portion 131 of the piston 130 by pressing the disk shutoff plate 190. Then, the oil is discharged through the discharge port (113) of the modulator block (110) through the discharge valve (180).

Further, the piston pump 100 of the present invention is further provided with a guide member 132 for guiding the reciprocating motion of the piston 130. The guide member 132 is engaged with the inner circumferential surface of the lower end of the pump filter 140 to support the movement of the pump filter 140.

The pump filter 140 filters the foreign substances from the oil flowing into the pump chamber 120. The pump filter 140 includes a cylindrical housing 141 surrounding the piston 130 and a filter member 142 provided in the housing 141 to filter foreign substances from the oil flowing into the pump chamber 120 . At this time, the piston 130 is inserted into the housing 141, and the filter member 142 may be spaced apart from the housing 141 at a predetermined interval, have.

The backflow prevention part 160 is provided on the outer periphery of the pump filter 140 and allows oil flowing into the pump chamber 120 through the first inlet 111 to flow therethrough into the pump chamber 120, Thereby preventing the oil flowing back to the first inlet 111. The backflow prevention part 160 is provided in the housing 141 of the pump filter 140 so that the oil introduced through the first inlet 111 flows into the outside of the inclined surface 161, The oil flowing backward from the first inlet 111 to the first inlet 111 is blocked by the inside of the latching jaw 162. That is, the backflow prevention part 160 is formed between the first inlet 111 and the second inlet 112 so that the oil introduced from the first inlet 111 passes through the second inlet 112 The oil that is flowing back from the side of the oil separator is blocked.

At this time, since the backflow prevention part 160 is made of a flexible material, the inclined surface 161 is pinched toward the center of the piston 130 by the oil flowing through the first inlet 111 The inflow of the oil can be easily performed.

According to the present invention, the backflow prevention part 160 may be formed integrally with the housing 141 of the pump filter 140 or may be separately formed and installed in the housing 141, and the backflow prevention part 160 May be gradually thinned from the housing 141 toward the inside of the pump chamber 120. In order to improve the flexibility of the end portion of the backflow prevention portion 160, the oil introduced into the pump chamber 120 is easily introduced and the oil flowing back in the pump chamber 120 is easily blocked. to be.

The backflow prevention part 160 may further include a curved surface 164 curved in the longitudinal direction on the inner circumferential surface of the pump chamber 120 to closely contact the outer side of the inclined surface 161. The curved surface 164 is in close contact with the outer side of the inclined surface 161 so that the oil flowing through the ABS first inlet port 111 and the oil flowing through the second ESC inlet port are in contact with the pressure of the piston 130 To the first inlet (111) side.

The clean ball 170 allows the oil remaining in the backflow prevention part 160 to flow, thereby removing the oil that is pressed against the backflow prevention part 160. If the oil remains in the inside of the latching protrusion 162 of the backflow prevention part 160, the flexibility of the backflow prevention part 160 is lowered and the oil flowing through the first inlet port 111 is allowed to pass therethrough , And blocking the oil flowing back from the pump chamber (120) is not smoothly performed. The clean ball 170 of the present invention is for solving such a problem. The clean ball 170 is composed of a plurality of the clean balls 170, and by the vibration generated by the reciprocating motion of the piston 130, And by moving the clean ball 170, the oil remaining in the retaining step 162 of the backflow prevention part 160 can be flowed.

At this time, a clean ball tuck 163 for preventing the clean ball 170 from being detached is further formed inside the engagement protrusion 162. Accordingly, the clean ball 170 flows along the clean ball jaw 163, and the oil remaining in the backflow prevention part 160 flows and can be removed.

As described above, according to the present invention, the oil flowing into the pump chamber through the first inlet is allowed to pass through the backflow prevention portion, and the oil in the pump chamber can be prevented from flowing back to the first inlet, There are advantages.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Piston pump with backflow prevention function
110: modulator block 111: first inlet
112: second inlet 113: outlet
120: pump room
130: piston 131:
132: guide member
140: pump filter 141: housing
142: Filter element
160: backflow prevention part 161: inclined surface
162: engagement jaw 163: clean ball point
164: curved face
170: clean ball
180: Discharge valve
190: disc blocking plate 191: spring

Claims (4)

(ABS) and an anti-lock brake system (TCS) side, respectively. The first inlet 111, the second inlet 112, A modulator block 110 having an outlet 113 through which the oil introduced through the first inlet 111 and the second inlet 112 is discharged, a pump chamber 120 provided in the modulator block 110, A piston pump comprising a piston (130) reciprocating in a pump chamber (120) and a pump filter (140) for filtering foreign substances from oil flowing into the pump chamber (120)
The first inlet (111) and the second inlet (112)
The inflow position of the oil flowing into the pump chamber 120 is formed to be shifted by a predetermined distance d,
On the outside of the pump filter 140,
And a backflow preventing part for preventing the oil flowing into the pump chamber 120 from flowing back to the first inlet 111 through the first inlet 111, (160); And
A clean ball 170 for allowing the oil remaining in the backflow prevention part 160 to flow;
Respectively,
The backflow prevention part (160)
The oil introduced into the first inlet 111 of the pump filter 140 flows into the outer side of the inclined surface 161 and the oil flowing backward from the pump chamber 120 flows through the first oil inlet 111 ), ≪ / RTI >
The clean ball (170)
And the backflow prevention part 160 flows in the circumferential direction of the housing 141 from the inside of the engagement protrusions 162 of the backflow prevention part 160 to allow the oil of the backflow prevention part 160 to flow. Piston pump.
The method according to claim 1,
The pump filter (140)
A housing 141 formed in a cylindrical shape surrounding the piston 130; And
A filter member 142 provided in the housing 141 to filter foreign substances from the oil flowing into the pump chamber 120;
And a backflow prevention function.
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