KR102389416B1 - Pump for brake of vehicle - Google Patents

Abstract

A pump for a vehicle brake is disclosed. A pump body into which a vehicle brake fluid is introduced, a pump cap body coupled to one end of the pump body from which the fluid is discharged, a buffer member disposed in close contact with an inner circumferential surface of the pump cap body, and opening and closing for opening and closing one end of the pump body A member and a pump cap having a return spring disposed inside the buffer member to support the opening/closing member, thereby reducing pulsation and improving NVH performance.

Description

Pump for brake of vehicle

The present invention relates to a pump, and more particularly to a pump for vehicle brakes.

The vehicle's brake system basically implements the vehicle's braking function as well as recently, to obtain a strong and stable braking force by effectively preventing the vehicle slipping phenomenon, and an anti-lock brake system ( Anti-Lock Brake System (ABS), a Brake Traction Control System (BTCS) that prevents slipping of the driving wheels when the vehicle starts or accelerates rapidly, and an anti-lock brake system and traction control to reduce the brake fluid pressure. A vehicle dynamic control system (VDC) that stably maintains a driving state of a vehicle by controlling it is disclosed.

Such a brake system includes a plurality of solenoid valves for controlling the braking hydraulic pressure transmitted to the wheel cylinder side mounted on the wheel of the vehicle, a pair of low pressure accumulators for temporarily storing the fluid escaping from the wheel cylinder, and the fluid of the low pressure accumulator It includes a motor and a pump for forced pumping, a solenoid valve and an ECU for controlling the motor operation, and these components are compactly built into the modulator block. Accordingly, the fluid of the low pressure accumulator is transferred to the wheel cylinder or the master cylinder by driving the pump.

Here, the pump is driven by a motor, and when the pressure of the wheel cylinder is reduced, the fluid from the wheel cylinder is discharged to the master cylinder, and, conversely, the fluid from the master cylinder is discharged to the wheel cylinder when the pressure of the wheel cylinder is increased. This is possible by the linear reciprocating motion of the piston according to the motor driving, and a description of the detailed configuration will be omitted.

Recently, in line with the development trend of advanced safety driving systems, additional functions that can perform Autonomous Emergency Braking (AEB) in case of an emergency while driving are being developed, and there is a movement to legalize the additional functions to be mandatory for new cars.

Accordingly, it is necessary to improve the pressure boosting performance by increasing the discharge amount of the pump. However, when the hole size of the pump connected to the wheel cylinder or the master cylinder is increased to improve the pressure increase performance, the pulsation force increases due to the increase in the discharge amount and NVH (Noise Vibration Harshness) performance There was a problem with this getting worse.

Republic of Korea Patent Publication No. 10-2013-0051376

Accordingly, the present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a vehicle brake pump in which pulsation generated during vehicle brake operation is reduced and NVH performance is improved.

A pump body into which a vehicle brake fluid is introduced according to an embodiment of the present invention for achieving the above object; and a pump cap body coupled to one end of the pump body from which the fluid is discharged, a buffer member disposed in close contact with an inner circumferential surface of the pump cap body, an opening/closing member for opening and closing one end of the pump body, and disposed inside the buffer member It may include; a pump cap having a return spring for supporting the opening and closing member.

The buffer member may include a cylindrical portion having an open end; a ring portion protruding along the outer periphery of the cylindrical portion; and a spring guide part protruding from the inner bottom surface of the cylindrical part.

The inside of the pump cap body may be divided into a first chamber and a second chamber by the ring part.

A first hole for communicating the first chamber and the second chamber may be formed on an outer periphery of the cylindrical part.

A second hole may be formed in the pump cap body to communicate with a wheel cylinder or a master cylinder of the vehicle.

The buffer member may include a cylindrical portion having an open end; a spring guide part protruding from the inner bottom surface of the cylindrical part; and a tubular outer wall portion having a larger diameter than the cylindrical portion, wherein one end of the cylindrical portion and one end of the outer wall portion may be connected by a connecting member.

The buffer member may be fitted to the pump cap body through a space between the cylindrical part and the outer wall part.

When the buffer member and the pump cap body are coupled, a buffer space of a predetermined volume may be formed between the cylindrical part and the outer wall part.

The buffer member may include a soft elastic component.

The distance between the spring guide part and the connection member may be longer than a distance from the center of the opening and closing member to any one end point.

The pump cap body may have a third hole formed in a side thereof to communicate with a wheel cylinder or a master cylinder of the vehicle.

The opening and closing member may have a ball shape.

The pump body may include: a housing having a discharge port through which the fluid is discharged; and a piston unit having an inlet through which the fluid is introduced, wherein the piston unit is disposed inside the housing unit and linearly reciprocates to discharge the fluid introduced from the inlet to the discharge port.

Therefore, according to the vehicle brake pump according to the embodiment of the present invention, the pulsation generated when the fluid is supplied to the wheel cylinder or the master cylinder according to the vehicle brake operation is reduced, and NVH performance can be improved.

1 is a side view of a vehicle brake pump according to a first embodiment of the present invention.
2 is a partial cross-sectional view of a vehicle brake pump according to a first embodiment of the present invention.
3 is a perspective view and a cross-sectional view of a buffer member according to a first embodiment of the present invention.
4 is an explanatory view of the operation of the vehicle brake pump according to the first embodiment of the present invention.
5 is a view comparing the pulsation of the vehicle brake pump according to the first embodiment of the present invention and the pulsation of the conventional pump.
6 is a side view of a vehicle brake pump according to a second embodiment of the present invention.
7 is a partial cross-sectional view of a vehicle brake pump according to a second embodiment of the present invention.
8 is a perspective view and a cross-sectional view of a buffer member according to a second embodiment of the present invention.
9 is an operation explanatory diagram of a vehicle brake pump according to a second embodiment of the present invention.
10 is a diagram comparing the pulsation of the vehicle brake pump according to the second embodiment of the present invention and the pulsation of the conventional pump.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and is not limited to the described embodiments. And in order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals in the drawings indicate the same members.

Throughout the specification, when a part “includes” a certain component, it does not exclude other components unless otherwise stated, but may further include other components.

Referring to FIG. 1 , the pump 10 for vehicle brake according to the first embodiment of the present invention includes a pump body 100 and a pump cap 200 , and a buffer member 220 is provided in the pump cap 200 . By providing a pulsation that occurs when the inflow and discharge of the vehicle brake fluid through the pump body part 100 and the pump cap part 200 is repeated according to the brake operation, and improves NVH (Noise Vibration Harshness) performance can do.

The pump body 100 includes a housing having an outlet through which a fluid is discharged and a piston having an inlet through which a fluid is introduced. can be repeatedly discharged. Here, the piston unit is capable of linear reciprocating motion by a motor or the like. The pump body 100 is described in various prior art, and further detailed description is omitted.

Hereinafter, the pump cap 200 will be described in detail with reference to FIGS. 2 to 3 .

The pump cap 200 is coupled to the pump body 100 to supply the fluid discharged from the pump body 100 to the master cylinder or wheel cylinder of the vehicle through an external flow path, the pump cap body 210, It may include a buffer member 220 , an opening/closing member 230 and a return spring 240 .

The pump cap body 210 may be coupled to one end of the pump body part 100 from which the fluid is discharged. The pump cap body 210 may be coupled while wrapping one end of the pump body part 100 . The pump cap body 210 may have an empty space therein. The pump cap body 210 may accommodate the buffer member 220 , the opening/closing member 230 , and the return spring 240 in the empty space inside. A hole may be formed in the outer periphery of the pump cap body 210 . The pump cap body 210 may communicate with the wheel cylinder or the master cylinder of the vehicle through a hole formed on the outer periphery.

The buffer member 220 is provided to reduce pulsation generated when the inflow and discharge of fluid for vehicle brake is repeated and to improve NVH (Noise Vibration Harshness) performance. may be placed in close contact with the

Referring to FIG. 3 , the buffer member 220 may include a cylindrical part 221 , a ring part 222 , and a spring guide part 223 .

The buffer member 220, one end of the cylindrical portion 221 is opened. The ring portion 222 is formed to protrude along the outer periphery of the cylindrical portion 221 , the spring guide portion 223 is formed to protrude from the inner bottom surface of the cylindrical portion 221 , and a first hole h1 is formed on the outer periphery of the cylindrical portion 221 . By forming this, it can be made. Here, the ring part 222 is preferably provided between one end of the cylindrical part 221 and the first hole h1.

The ring part 222 divides the inner space of the pump cap body 210 into a first chamber ch1 and a second chamber ch2 when the buffer member 220 is disposed in close contact with the pump cap body 210 . can

In addition, the first hole h1 of the buffer member 220 may communicate the first chamber ch1 and the second chamber ch2 partitioned by the ring part 222 .

Referring back to FIG. 2 , the opening/closing member 230 may be disposed inside the buffer member 220 . The opening and closing member 230 may have a ball shape. It is preferable that the diameter of the opening and closing member 230 is smaller than the inner diameter of the buffer member 220 .

The return spring 240 may be disposed on the inner bottom surface of the buffer member 220 to support the closing member 230 . The return spring 240 may be disposed to surround the spring guide part 223 of the buffer member 220 . That is, the return spring 240 may be disposed in a space between the inner peripheral surface of the cylindrical portion 221 of the buffer member 220 and the spring guide portion 223 .

When the return spring 240 is disposed on the buffer member 220 while supporting the opening/closing member 230 , it pushes the opening/closing member 230 in the direction of the pump body 100 to be formed at one end of the pump body 100 . The outlet can be closed.

Hereinafter, a fluid flow process when the pump 10 is operated according to the operation of the vehicle brake will be described with reference to FIG. 4 .

First, when pressure increase or pressure reduction of the vehicle wheel cylinder is required according to the operation of the vehicle brake, the fluid flows into the pump body 100 from the wheel cylinder or the master cylinder.

Then, in Fig. 4 (a), when the internal piston of the pump body 100 by a motor or the like makes a linear forward motion, the fluid flowing into the pump body 100 passes through the outlet of the pump body 100 . After pushing out the blocking member 230, it is discharged into the pump cap body 210. At this time, the opening/closing member 230 compresses the return spring 240 and then collides with the spring guide part 223 and stays there.

Then, the fluid discharged into the pump cap body 210 passes through the first chamber ch1, the space between the buffer member 220 and the opening/closing member 230, and the first hole h1, to the second chamber ch2 ) is introduced into Such a flow of fluid has an effect of reducing the vibration of the opening and closing member 230 .

In addition, the fluid discharged into the pump cap body 210 is supplied to the wheel cylinder or the master cylinder through the second hole h2 of the pump cap part 210 and the flow path connected to the pump cap part 210 .

Then, in FIG. 4 (b), when the internal piston of the pump body part 100 performs a linear backward motion, the internal pressure of the pump cap part 200 is lower than that of the pump body part 100, and the return spring 240 ) pushes the opening and closing member 230 while returning to the original shape through the elastic restoring force to close the discharge port of the pump body 100 . At this time, the fluid in the second chamber (ch2) flows toward a lower pressure space, and the movement speed of the opening and closing member 230 is increased by the flow of the fluid, and by the fast opening and closing operation of the opening and closing member 230 The pulsation can be reduced.

The fluid flow process described in FIGS. 4 (a) and (b) is repeated through the linear reciprocating motion of the piston, and through this, sufficient fluid is supplied to the wheel cylinder or the master cylinder.

On the other hand, the fluid supplied to the wheel cylinder increases the pressure of the wheel cylinder to increase the vehicle braking force. In addition, since the fluid is supplied to the master cylinder and the fluid has escaped from the wheel cylinder, the wheel cylinder is depressurized and the vehicle braking force is reduced.

Referring to FIG. 5 , the pulsation of the conventional pump and the vehicle brake pump 10 according to the first embodiment of the present invention can be confirmed.

Accordingly, since the pump 10 for vehicle brake according to the first embodiment of the present invention includes the buffer member 220 , pulsation generated during fluid supply can be reduced and NVH performance can be improved.

Referring to FIG. 6 , the pump 20 for vehicle brake according to the second embodiment of the present invention includes a pump body part 300 and a pump cap part 400 , and a buffer member 420 on the pump cap part 400 . By providing a, pulsation generated when the inflow and discharge of the vehicle brake fluid through the pump body part 300 and the pump cap part 400 is repeated according to the brake operation, and improve NVH (Noise Vibration Harshness) performance can do. Here, the vehicle brake pump 20 according to the second embodiment includes a buffer member 220 used in the vehicle brake pump 10 according to the first embodiment and a buffer member different in shape and function.

Since the pump body 300 is the same as the pump body 100 described with reference to FIGS. 1 to 5 , a detailed description thereof will be omitted.

Hereinafter, the pump cap 400 will be described in detail with reference to FIGS. 7 to 8 .

The pump cap unit 400 is connected to the external flow path to supply the fluid discharged from the pump body unit 300 to the master cylinder or wheel cylinder of the vehicle through the external flow path, and the pump cap body 410, the buffer member 420 ), an opening/closing member 430 and a return spring 440 may be included.

The pump cap body 410 may be coupled to one end of the pump body part 300 from which the fluid is discharged. The pump cap body 410 may be coupled while wrapping one end of the pump body part 300 . The pump cap body 410 may have an empty space therein. The pump cap body 410 may accommodate the buffer member 420 , the opening/closing member 430 , and the return spring 440 in the empty space inside. A hole may be formed in the outer periphery of the pump cap body 410 . The pump cap body 410 may communicate with the wheel cylinder or the master cylinder of the vehicle through a hole formed on the outer periphery.

The buffer member 420 is provided to reduce pulsation generated when the inflow and discharge of fluid for vehicle brake is repeated and to improve NVH (Noise Vibration Harshness) performance. may be placed in close contact with the

Referring to FIG. 8 , the buffer member 420 may include a cylindrical part 421 , a spring guide part 422 , an outer wall part 423 , and a connection member 424 .

The buffer member 420 has one end of the cylindrical portion 421 open. The spring guide part 422 is formed to protrude from the inner bottom surface of the cylindrical part 421 , and one end of the tubular outer wall part 423 is connected to one end of the cylindrical part 421 through the connecting member 424 . can Here, the buffer member 420 includes a soft elastic component. The outer wall portion 423 has a larger diameter than the cylindrical portion 421 . The distance between the spring guide part 422 and the connecting member 424 is preferably longer than the distance from the center of the opening and closing member 430 to either end point. Through this, the shaking of the opening and closing member 430 may be reduced.

The buffer member 420 may be fitted to the pump cap body 410 through a space between the cylindrical portion 421 and the outer wall portion 423 . Here, when the buffer member 420 and the pump cap body 410 are fitted, a buffer space sp of a predetermined volume may be formed between the cylindrical portion 421 and the outer wall portion 423 .

Referring back to FIG. 7 , the opening/closing member 430 may be disposed inside the buffer member 420 . The opening and closing member 430 may have a ball shape. The diameter of the opening and closing member 430 is preferably smaller than the inner diameter of the buffer member (420).

The return spring 440 may be disposed on the inner bottom surface of the buffer member 420 to support the closing member 430 . The return spring 440 may be disposed to surround the spring guide part 422 of the buffer member 420 . That is, the return spring 440 may be disposed in a space between the inner peripheral surface of the cylindrical portion 421 of the buffer member 420 and the spring guide portion 424 .

When the return spring 440 is disposed on the buffer member 420 while supporting the opening/closing member 430 , it pushes the opening/closing member 430 in the direction of the pump body 300 to be formed at one end of the pump body 300 . The hole can be closed.

Hereinafter, a fluid flow process when the pump 20 is operated according to the operation of the vehicle brake will be described with reference to FIG. 9 .

First, when pressure increase or pressure reduction of the vehicle wheel cylinder is required according to the operation of the vehicle brake, the fluid flows into the pump body 300 from the wheel cylinder or the master cylinder.

Then, in FIG. 9( a ), when the internal piston of the pump body part 300 makes a linear forward motion by a motor or the like, the fluid introduced into the pump body part 300 passes through the hole of the pump body part 300 . After pushing out the blocking member 430, it is discharged into the pump cap body 410. At this time, the opening/closing member 430 is stopped by colliding with the spring guide part 422 after compressing the return spring 440 .

Then, the fluid discharged into the pump cap body 410 passes through the space between the buffer member 420 and the opening and closing member 430 first and flows into the buffer member 420 inner space. In addition, the fluid discharged into the pump cap body 410 presses the connecting member 423 connecting the cylindrical portion 421 and the outer wall portion 423, and at this time, the connecting member 423 is pressed. Accordingly, the volume of the buffer space sp is reduced.

Then, the fluid discharged into the pump cap body 410 is supplied to the wheel cylinder or the master cylinder through the third hole h3 of the pump cap part 410 and the flow path connected to the pump cap part 410 .

Then, in FIG. 9 (b), when the internal piston of the pump body part 300 performs a linear backward motion, the internal pressure of the pump cap part 400 is lower than that of the pump body part 300, and the return spring 440 ) closes the hole of the pump body 300 by pushing the opening and closing member 430 while returning to its original shape through the elastic restoring force.

At this time, the connecting member 424 of the buffer member 420 that was pressurized by the fluid pushes the fluid back to its original shape by the elastic restoring force, and the moving speed of the opening/closing member 430 is increased by the flow of the fluid. , the pulsation can be reduced by the quick opening and closing operation of the opening and closing member 430 as described above.

The fluid flow process described in FIGS. 4 (a) and (b) is repeated through the linear reciprocating motion of the piston, and through this, sufficient fluid is supplied to the wheel cylinder or the master cylinder.

On the other hand, the fluid supplied to the wheel cylinder increases the pressure of the wheel cylinder to increase the vehicle braking force. In addition, since the fluid is supplied to the master cylinder and the fluid has escaped from the wheel cylinder, the wheel cylinder is depressurized and the vehicle braking force is reduced.

Referring to FIG. 10 , the pulsation of the conventional pump and the vehicle brake pump 20 according to the second embodiment of the present invention can be confirmed.

Therefore, since the pump 20 for vehicle brake according to the second embodiment of the present invention includes the buffer member 420 , pulsation generated during fluid supply can be reduced and NVH performance can be improved.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: pump for vehicle brake
100: pump body
200: pump cap part
210: pump cap body
220: buffer member
221: cylindrical part
222: ring part
223: spring guide part
230: opening and closing member
240: return spring
20: pump for vehicle brake
300: pump body
400: pump cap part
410: pump cap body
420: buffer member
421: cylindrical part
422: spring guide part
423: outer wall portion
424: connecting member
430: opening and closing member
440: return spring

Claims (13)

a pump body into which a vehicle brake fluid is introduced; and
A pump cap body coupled to one end of the pump body from which the fluid is discharged, a buffer member disposed in close contact with an inner circumferential surface of the pump cap body, an opening/closing member for opening and closing one end of the pump body, and an opening/closing member disposed inside the buffer member to open and close Includes; a pump cap portion having a return spring for supporting the member;
The buffer member,
One end of the open cylindrical portion;
a ring portion protruding along the outer periphery of the cylindrical portion; and
A vehicle brake pump comprising a; a spring guide portion protruding from the inner bottom surface of the cylindrical portion. delete The method of claim 1,
The inside of the pump cap body is divided into a first chamber and a second chamber by the ring part. 4. The method of claim 3,
A vehicle brake pump, characterized in that a first hole for communicating the first chamber and the second chamber is formed on an outer periphery of the cylindrical part. 5. The method of claim 4,
The pump cap body has a second hole formed therein to communicate with a wheel cylinder or a master cylinder of the vehicle. a pump body into which a vehicle brake fluid is introduced; and
A pump cap body coupled to one end of the pump body from which the fluid is discharged, a buffer member disposed in close contact with an inner circumferential surface of the pump cap body, an opening/closing member for opening and closing one end of the pump body, and an opening/closing member disposed inside the buffer member to open and close Includes; a pump cap portion having a return spring for supporting the member;
The buffer member,
One end of the open cylindrical portion;
a spring guide part protruding from the inner bottom surface of the cylindrical part; and
Including; a tubular outer wall portion having a larger diameter than the cylindrical portion,
A vehicle brake pump, characterized in that one end of the cylindrical portion and one end of the outer wall portion are connected by a connecting member. 7. The method of claim 6,
wherein the buffer member is fitted to the pump cap body through a space between the cylindrical portion and the outer wall portion. 8. The method of claim 7,
When the buffer member and the pump cap body are coupled, a buffer space of a predetermined volume is formed between the cylindrical part and the outer wall part. 8. The method of claim 7,
The buffer member is a vehicle brake pump including a soft elastic component. 7. The method of claim 6,
A distance between the spring guide part and the connection member is longer than a distance from the center of the opening/closing member to any one end point. 7. The method of claim 6,
The pump cap body has a third hole formed on a side thereof to communicate with a wheel cylinder or a master cylinder of the vehicle. The method of claim 1,
The opening and closing member is a vehicle brake pump, characterized in that the ball shape. The method of claim 1,
The pump body part,
a housing portion having a discharge port through which the fluid is discharged; and
Includes; a piston having an inlet through which the fluid is introduced;
The piston part is disposed inside the housing part, and the fluid introduced from the inlet is discharged to the outlet through a linear reciprocating motion.

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