KR20050110049A - Pump for electronic control brake system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for an electronically controlled brake system. In particular, a modulator block is provided with a valve insert having a suction flow path and a discharge flow path, and an inlet valve is installed to open and close the suction flow path of the valve insert. Orifice-formed valve seats are connected by return springs, outlet valves are formed to open and close the orifices, outlet valve caps are formed to support the outlet valves and close one side of the bore, and the valve insert on the other side of the bore. And a pump for an electronically controlled brake system in which a piston cap is disposed adjacent to and.

Description

Pump for electronic control brake system

The present invention relates to a pump for an electronically controlled brake system.

In general, the electronically controlled brake system is to obtain a strong and stable braking force by effectively preventing the slip phenomenon of the vehicle, the anti-lock brake system (ABS) to prevent the sliding of the wheel during braking, Brake Traction Control System (BTCS), which prevents slippage of the drive wheel during sudden start or acceleration of the vehicle, and anti-lock brake system and traction control in combination to control brake hydraulic pressure to keep the vehicle stable. A vehicle dynamic control system (VDC) and the like are disclosed.

The electronically controlled brake system includes a plurality of solenoid valves for controlling braking hydraulic pressure delivered to a hydraulic brake side mounted on a wheel of a vehicle, a pair of low pressure accumulators and a high pressure accumulator for temporarily storing oil discharged from the hydraulic brakes. And a motor and pump for forcibly pumping the oil of the low pressure accumulator, and an ECU for controlling the driving of the solenoid valve and the motor. These components are compactly embedded in the modulator block. Thus, by driving the pump, the low pressure oil of the low pressure accumulator is pressurized and pumped to the high pressure accumulator, which is transmitted to the hydraulic brake or master cylinder assembly side. Such a pump is driven by a motor and, as such a pump structure, is disclosed in the publications of Korean Patent Publication No. 2001-0097094, Korean Patent Publication No. 2002-0069784, and Korean Patent Publication No. 2003-0067839.

A pump for a conventional electronically controlled brake system is shown in FIG. As shown in FIG. 1, a conventional pump for an electronically controlled brake system is installed in a bore formed in the modulator block 20 so as to reciprocate by an eccentric cam of a motor, and has a valve insert having a suction flow path 12a formed therein. 12, an inlet valve 13 for opening and closing the outlet side of the suction flow passage 12a according to the position of the valve insert 12, and an outlet valve provided at the open end of the bore and operating opposite to the inlet valve 13 ( 17). In addition, the modulator block 20 includes a suction port 20a for linking the inlet side of the valve insert 12 suction passage 12a with a low pressure accumulator (not shown), and an inlet side and an outlet of the high pressure accumulator (not shown). The discharge port 20b for engaging the outlet side of the valve 17 is processed. Further, an inlet valve 13 is provided at the tip end of the valve insert 12.

In the conventional pump for electronically controlled brake system configured as described above, the valve insert 12 reciprocates as the eccentric cam of the motor rotates, and the inlet valve 13 and the outlet valve ( 17) is opened and closed, the oil is pressurized and pumped to the high pressure accumulator side.

However, the above-described pump for an electronically controlled brake system has the following problems.

When the eccentric cam of the motor rotates and the needle bearing 10 rotates, the valve insert 12 and the inlet valve 13 simultaneously reciprocate during the reciprocation of the piston cap 11 due to the rotation of the needle bearing 10. . At this time, a change in hydraulic pressure occurs, and as the flow direction coming from the valve insert 12 becomes complicated during the inlet stroke of the inlet valve 13, the fluidity is lowered and the open responsiveness of the inlet valve 13 is lowered. For this reason, the performance of a pump falls.

In addition, the size of the pump is increased because a large chamber is required due to the structural shape of the inlet valve 13 and the inlet valve cap 14 reciprocating in the pump cylinder 15.

Furthermore, the shape of the valve insert 12 and the inlet valve cap 14 is complicated, which makes machining difficult, difficult to manage, and expensive.

In addition, the shape of the piston cap 11 is a straight line, it can be taken out of the bore during assembly or handling, difficult to manage and expensive.

The present invention has been made to solve the above-described problems, the flow direction is shortened and the flow distance is shortened the flow direction coming from the valve insert during the inlet stroke of the inlet valve, the open responsiveness of the inlet valve is faster, thereby improving the performance of the pump It is an object of the present invention to provide a pump for an electronically controlled brake system.

In addition, it is possible to provide a pump for an electronically controlled brake system that can reduce the noise due to a stable flow when the hydraulic change occurs to improve the performance of the pump.

Furthermore, valve inserts provide a pump for an electronically controlled brake system that can have both versatility in functionality and low cost in price.

Another feature of the present invention is to provide a pump for an electronically controlled brake system that can reduce the size of the chamber, thereby reducing the size of the pump and making it possible to manufacture a compact pump.

It is another feature of the present invention to provide a pump for an electronically controlled brake system in which the valve insert can be sealed in close contact with the inner diameter of the pump cylinder when the valve insert reciprocates.

It is a further feature of the present invention to provide a pump for an electronically controlled brake system that can secure the piston cap to the pump cylinder at low cost and can be easily managed and eliminated during assembly and handling.

In accordance with another aspect of the present invention, there is provided a pump for an electronically controlled brake system, comprising: a valve insert installed in a bore formed in a modulator block and having a suction flow path and a discharge flow path formed therein; An inlet valve installed in the valve insert to open and close the suction flow path; A valve seat connected to the return valve at regular intervals from the valve insert and having an orifice formed therein; An outlet valve for opening and closing the orifice; An outlet valve cap supporting the outlet valve and closing one side of the bore; On the other side of the bore is disposed adjacent to the valve insert and comprises a piston cap to advance and retreat by the rotation of the eccentric cam driven by the motor,

When the piston cap is retracted, the valve insert retreats at the same time.

According to this configuration, the flow direction coming from the valve insert during the inlet stroke of the inlet valve is simplified and the flow distance is shortened, thereby increasing the open responsiveness of the inlet valve, thereby improving the performance of the pump.

In addition, it is possible to reduce the noise due to the stable flow when the hydraulic change occurs to improve the performance of the pump.

On the other hand, since the suction passage and the discharge passage are formed separately in the valve insert, and the material is made of plastic, the valve insert can have both the versatility in function and the low price in terms of function.

In the above-described configuration, when the discharge flow path is formed inside the inlet valve cap in which the sphere and the elastic member of the inlet valve are accommodated, the size of the valve insert can be reduced, so that the size of the pump can be reduced and a compact pump can be manufactured. .

In addition, when a lip seal is formed at one end of the valve insert, the lip seal of the valve insert is sealed in close contact with the inner diameter of the pump cylinder when the valve insert reciprocates.

Further, the piston cap is preferably in the shape of a pipe with one end closed.

Here, if the inlet valve cap is disposed inside the piston cap, the size of the pump can be reduced since the size of the chamber can be reduced.

On the other hand, once the fixing piece is formed on one end of the piston cap, it is possible to fix the piston cap.

In addition, the bore inner diameter is formed around the outer diameter of the valve insert, the pump cylinder is formed, if the pump cylinder is formed with a fixing portion for fixing the fixing piece, it is possible to fix the piston cap to the pump cylinder at low cost, and There is no fear of dropping out during handling and it is easy to manage.

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

For reference, among the configurations of the present invention to be described below, the same configuration as the prior art will be referred to the above-described prior art, and a detailed description thereof will be omitted.

2 is a cross-sectional view showing a pump for an electronically controlled brake system according to a preferred embodiment of the present invention, Figure 3 is an enlarged cross-sectional view of the inlet valve of FIG.

As shown in FIG. 2, the pump for the electronically controlled brake system of the present embodiment is a bore formed in the modulator block 200 in the pump for the electronically controlled brake system in which oil on the low pressure accumulator side is pumped to the high pressure accumulator side. A valve insert 120 installed in the 201 and having a suction passage 120a and a discharge passage 120b therein, and an inlet valve 130 installed in the valve insert 120 to open and close the suction passage 120a; A valve seat 180 connected to the return spring 160 at regular intervals from the valve insert 120 and having an orifice 181, an outlet valve 170 for opening and closing the orifice 181, and an outlet valve 170. And an outlet valve cap 190 for supporting one side of the bore 201 and closing the one side of the bore 201 and adjoining the valve insert 120 on the other side of the bore 201 and moving back and forth by rotation of an eccentric cam driven by a motor. Piston It comprises a cap 110.

In the modulator block 200, a pump mounting bore 201 is machined into a cylinder shape, which is connected to a low pressure accumulator (not shown) and a high pressure accumulator (not shown) through the suction port 200a and the discharge port 200b. .

An inner diameter of the bore 201 is equipped with a pump cylinder 150 in which insertion holes 150a and 150b are drilled to communicate with the suction port 200a and the discharge port 200b, respectively.

The outer diameter of the valve insert 120 is fitted into the inner diameter of the pump cylinder 150.

An outer circumferential surface of the valve insert 120 may be provided with a back ring 125 to prevent oil leakage.

One end of the valve insert 120 is formed with a ring-shaped lip seal 123 along the circumference of the valve insert 120.

As such, when the lip seal 123 is formed on the valve insert 120, the lip seal 123 of the valve insert 120 comes into close contact with the inner diameter of the pump cylinder 150 when the valve insert 120 reciprocates and is sealed.

The suction passage 120a and the discharge passage 120b are separately formed in the valve insert 120.

The suction passage 120a communicates with the suction port 200a and is formed in the radial direction of the pump, and is further formed in the vertical direction to form an outlet end at one end of the valve insert 120.

The discharge passage 120b is formed in the vertical direction to penetrate one end and the other end of the valve insert 120.

As such, the inlet flow passage 120a and the discharge flow passage 120b are separately formed in the valve insert 120, and the material is made of plastic, so that the valve insert 120 is multifunctional in terms of function and price. Can have all the advantages of low cost.

An inlet valve 130 for opening and closing the suction flow path 120a is installed at the outlet end of the valve insert 120 and the suction flow path 120a.

As shown in FIG. 3, the inlet valve 130 accommodates the sphere 131, the elastic member 133 supporting the sphere 131, the sphere 131 and the elastic member 133, and receives the sphere 131. Inlet valve cap 140 to prevent separation.

The inlet valve cap 140 has a pipe portion body 143 in which a sphere 131 is accommodated therein, a stopper 141 formed at one end of the body portion 143, and a flange formed at the other end of the body portion 143. 145.

The stopper 141 is formed toward the center of the body portion 143 along the circumference of one end of the body portion 143, and an elastic member 133 is mounted between the stopper 141 and the sphere 131.

The flange 145 extends outward of the body portion 143 along the circumference of the other end of the body portion 143, and the flange 145 is mounted to the valve insert 120.

Here, the discharge flow path 120b is preferably formed to be disposed inwardly of the inlet valve cap 140.

As such, when the discharge passage 120b is formed to be disposed inward of the inlet valve cap 140, the size of the valve insert 120 can be reduced, so that the size of the pump becomes small and a compact pump can be manufactured.

On the other hand, the valve insert 120 is disposed at regular intervals, the valve seat 180 is mounted so that the lower chamber 208 is formed.

The valve insert 120 and the valve seat 180 are connected to the return spring 160.

The return spring 160 serves to restore the valve insert 120.

An orifice 181 is formed in the valve seat 180.

The orifice 181 is provided with an outlet valve 170 that operates opposite to the inlet valve 130.

The outlet valve 170 is supported by an outlet valve cap 190 fitted to the open end side of the bore 201, an elastic member 173 in contact with the outlet valve cap 190, and an elastic member 173 and is supported by an orifice. It consists of a sphere 171 that opens and closes 181.

The outlet valve cap 190 is fitted to the open end side of the bore 201, but is disposed at regular intervals with the valve seat 180, so that a flow path 191 is formed, and the flow path 191 is a discharge port 200b. In communication with.

On the other hand, the piston cap 110 is disposed adjacent to the valve insert 120 on the opposite side of the outlet valve cap 190 fitted to the open end side of the bore 201.

The piston cap 110 has a pipe shape with one end closed.

The piston cap 110 is reciprocated in the bore 201 by the rotation of the eccentric cam driven by the motor.

On the other hand, the eccentric cam is provided with a needle bearing 100, it is possible to drive the piston cap disposed on both sides of the eccentric cam at the same time, the closed portion of each piston cap 110 is adjacent to the needle bearing 100 .

On the outer circumferential surface of the piston cap 110, an O-ring 115 and a guide ring 117 are installed to prevent oil leakage during operation.

Here, the inlet valve cap 140 is preferably installed to be disposed inside the piston cap 110.

That is, the body 143 and the stopper 141 of the inlet valve cap 140 are disposed inside the piston cap 110.

Thus, the size of the pump is reduced because the inlet valve 130 and the inlet valve cap 140 reciprocating can be disposed inside the piston cap 110 to reduce the size of the chamber 205.

Furthermore, when the fixing piece 111 is formed at one end of the piston cap 110, the piston cap 110 may be fixed.

The fixing piece 111 is preferably mounted to the flange 145 of the inlet valve cap 140.

In addition, it is preferable that the fixing portion 151 is formed in the pump cylinder 150 to fix the fixing piece 111.

Thus, the fixing piece 111 is formed in the piston cap 110, the fixing part 151 is formed in the pump cylinder 150, and the fixing piece 111 is caught and fixed to the fixing part 151, thereby providing a low cost pump. The piston cap 110 can be fixed to the cylinder 150, and there is no fear of detachment during assembly and handling, and management becomes easy.

The operation of this embodiment having the above-described configuration will be described below.

In the pump according to the embodiment of the present invention, when the eccentric cam is rotated by the driving of the motor, the piston cap 110 inside the bore 201 retreats and contacts the fixed piece 111 of the piston cap 110. As the insert 120 advances and retracts together, the oil introduced through the suction port 200a is forcibly pumped toward the discharge port 200b.

In detail, when the piston cap 110 of the pump advances toward the inside of the bore 201, the valve insert 120 is advanced together by the fixing piece 111 of the piston cap 110, thereby forming a chamber. As the oil pressure of 205 increases, the inlet valve 130 closes the suction flow path 120a of the valve insert 120.

In addition, since the oil pressure of the lower chamber 208 communicating with the chamber 205 and the discharge passage 120b rises together, the oil of the lower chamber 208 passing through the discharge passage 120b is discharged from the outlet valve 170. While pushing the sphere 171 is supplied to the discharge port 200b through the flow path (191).

On the contrary, when the valve insert 120 of the pump performs the retraction stroke, the piston cap 110 also retreats because the valve insert 120 and the fixing piece 111 of the piston cap 110 are adjacent to each other. As the lower chamber 208 becomes low pressure and the outlet valve 170 is closed, the chamber 205 which communicates with the lower chamber 208 and the discharge flow path 120b becomes low pressure, and the inlet valve 130 opens, The oil flowing into the port 200a flows in through the suction flow path 120a of the valve insert 120.

In this way, since the flow direction coming from the valve insert 120 is simplified and the flow distance becomes short during the inlet stroke of the inlet valve 130, the open responsiveness of the inlet valve 130 is faster, thereby improving the performance of the pump.

In addition, since the inlet valve 130 is fixed to the valve insert 120 during the suction stroke and the compression stroke, the valve insert 120 and the inlet valve 130 move together, thereby reducing noise due to a stable flow when a hydraulic change occurs. The performance is excellent.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below. Or it may be modified.

According to the pump for an electronically controlled brake system of the present invention as described above, the following effects are obtained.

First, the valve insert is formed in the bore formed in the modulator block, the valve insert formed with the suction flow path and the discharge flow path, the inlet valve installed on the valve insert to open and close the suction flow path, and the valve is connected to the return spring at regular intervals from the valve insert The outlet valve for opening and closing the seat, the orifice, the outlet valve cap for supporting the outlet valve and closing one side of the bore, and the other side of the bore are disposed adjacent to the valve insert, and retracted by rotation of the eccentric cam driven by the motor. Including the piston cap, the valve insert is retracted at the same time when the piston cap is retracted, the flow direction from the valve insert is simplified and the flow distance is shortened during the inlet stroke of the inlet valve, so the open responsiveness of the inlet valve is faster Due to this, the performance of the pump is improved.

In addition, since the inlet valve is fixed to the valve insert during the suction stroke and the compression stroke, the valve insert and the inlet valve move together to reduce noise due to stable flow when a hydraulic change occurs, thereby improving the performance of the pump.

On the other hand, since the suction passage and the discharge passage are formed separately in the valve insert, and the material is made of plastic, the valve insert can have both the versatility in function and the low price in terms of function.

Second, since the discharge flow path is formed inside the inlet valve cap, the size of the valve insert can be reduced, so that the size of the pump can be reduced and a compact pump can be manufactured.

Third, since a lip seal is formed at one end of the valve insert, the lip seal of the valve insert may be sealed to the inner diameter of the pump cylinder when the valve insert reciprocates.

Fourth, the piston cap is in the shape of a pipe closed one end, the inlet valve cap is disposed inside the piston cap, it is possible to reduce the size of the chamber can be reduced in size of the pump.

Fifth, a fixed piece is formed in the piston cap, and a fixed part is formed in the pump cylinder, so that the fixed piece is fixed to the fixed part, so that the piston cap can be fixed to the pump cylinder at low cost. Lose.

1 is a cross-sectional view showing a conventional pump for an electronically controlled brake system.

2 is a cross-sectional view showing a pump for an electronically controlled brake system according to a preferred embodiment of the present invention.

3 is an enlarged cross-sectional view of the inlet valve of FIG.

<Explanation of symbols for the main parts of the drawings>

100: needle bearing 110: piston cap

111: fixed piece 115: O-ring

117: guide ring 120: valve insert

120a: suction passage 120b: discharge passage

123: lip seal 125: back ring

130: inlet valve 131: sphere

133: elastic member 140: inlet valve cap

141: stopper 143: body

145 flange 150 pump cylinder

150a, 150b: insertion hole 151: fixing part

160: return spring 170: outlet valve

171 sphere 173 elastic member

180: valve seat 181: orifice

190: outlet valve cap 191: euro

200: modulator block 200a: suction port

200 b: discharge port 20 1: bore

205 chamber 208 lower chamber

Claims (7)

In the pump for an electronically controlled brake system, A valve insert installed in a bore formed in the modulator block and having a suction flow path and a discharge flow path; An inlet valve installed in the valve insert to open and close the suction flow path; A valve seat connected to the return valve at regular intervals from the valve insert and having an orifice formed therein; An outlet valve for opening and closing the orifice; An outlet valve cap supporting the outlet valve and closing one side of the bore; On the other side of the bore is disposed adjacent to the valve insert and comprises a piston cap to advance and retreat by the rotation of the eccentric cam driven by the motor, And the valve insert simultaneously retracts when the piston cap is retracted. The method of claim 1, And the discharge passage is formed inside the inlet valve cap in which the sphere of the inlet valve and the elastic member are accommodated. The method according to claim 1 or 2, A pump for an electronically controlled brake system, characterized in that a lip seal is formed at one end of the valve insert. The method according to claim 1 or 2, The piston cap is a pump for an electronically controlled brake system, characterized in that the one end is a pipe shape. The method of claim 4, wherein And said inlet valve cap is disposed inside said piston cap. The method of claim 4, wherein A pump for an electronically controlled brake system, characterized in that a fixed piece is formed at one end of the piston cap. The method of claim 6, The bore inner diameter surrounds the outer diameter of the valve insert to form a pump cylinder, The pump cylinder is an electronically controlled brake system, characterized in that the fixing portion is formed to fix the fixing piece.