KR100413315B1 - Low pressure accumulator of modulator block for anti-lock brake system - Google Patents

Abstract

The present invention relates to a low pressure accumulator provided in a modulator block for an anti-lock brake system of a vehicle. In particular, a part of a storage compartment in which oil of a low pressure accumulator is accommodated is located outside the modulator block so that the size of the modulator block can be reduced. It is.

The low-pressure accumulator according to the present invention for this purpose is formed in the modulator block recessed to a predetermined depth and has a receiving groove having a flow path for entering and exiting oil therein, one end is coupled to the receiving groove and the other end is predetermined to the outside of the receiving groove A hollow guide tube extending in length, a piston installed in the guide tube in a retractable manner, a restoring spring installed in the guide tube and having one end elastically supporting the piston, and the other end of the restoring spring The guide tube is coupled to the guide tube so as to prevent the separation of the guide tube is made of a configuration comprising a fixing member fixed to the modulator block.

Description

LOW PRESSURE ACCUMULATOR OF MODULATOR BLOCK FOR ANTI-LOCK BRAKE SYSTEM}

The present invention relates to a low pressure accumulator of a modulator block for an anti-lock brake system of a vehicle, and more particularly to a low pressure accumulating the part of a storage compartment in which oil is accommodated outside of the modulator block. It is about an accumulator.

An anti-lock brake system (hereinafter referred to as ABS) mounted on a vehicle is a device that prevents road slippage by stopping the brake hydraulic pressure transmitted to the wheel side for safe braking of the vehicle. to be.

Such a vehicle ABS is provided with a modulator block for controlling braking hydraulic pressure in the middle of the hydraulic line connected to the wheel side from the master cylinder, the modulator block, a plurality of solenoid valves for opening and closing the flow path, a hydraulic pump for repressurizing the returning fluid, Low pressure and high pressure accumulators are provided on the upstream and downstream sides of the hydraulic pump, respectively. In addition, these devices are interconnected through a plurality of flow paths formed inside the modulator block, and their operation is controlled by an ECU (ELECTRIC CONTROL UNIT). That is, the ECU controls the plurality of solenoid valves to open and close the flow path, and also controls the driving of the pump so that the fluid returned along the hydraulic line is re-pressurized to the wheel side, thereby enabling intermittent braking of the wheels.

Here, the low pressure accumulator installed in the modulator block functions to temporarily store the brake oil returning from the wheel side and to supply the pump side, and the high pressure accumulator installed downstream of the pump temporarily stores the pressurized oil from the pump. Pressure pulsation according to the operation of the function to be attenuated.

As shown in FIG. 1, the low pressure accumulator installed in the upstream flow path of the double pump has a hollow storage compartment 2 formed inside the modulator block 1 and the internal space of the storage compartment 2 can be increased or decreased. It is provided with a piston (3) to advance and retreat inside the storage compartment (2). At this time, the outer peripheral surface of the piston (3) is provided with a sealing member (3a) forming a gas tight structure between the inner surface of the storage chamber (2). In addition, the storage chamber 2 is provided with a restoring spring 4 for elastically supporting the rear surface of the piston 3 to impart restoring force to the piston, and at the opening of the storage chamber 2 while supporting the restoring spring 4 at the same time. A stopper 5 for blocking the opening of 2) is provided. At this time, the stopper 5 is fixed to the inner side of the opening side of the storage chamber 2 through the fixing ring 6 fitted to the outer surface. The other end of the storage compartment 2 located opposite the stopper 5 is formed with a flow passage 1a through which fluid flows into or out of the storage compartment 2, which is pumped at the wheel side of the vehicle. It communicates with the flow path connected to the inlet side of.

In the conventional low pressure accumulator configured as described above, when oil returning from the wheel side of the vehicle flows into the storage compartment 2 through the flow passage 1a, the piston 3 is pushed in the "A" direction by the pressure of the oil, Will accept. In operation of the pump (not shown), the oil inside the storage chamber 2 is again supplied to the inlet side of the pump through the flow path 1a. At this time, the piston 3 in the storage chamber 2 is moved to the "B" direction by the elasticity of the restoring spring 4 to be restored to the original state. In other words, the low pressure accumulator facilitates the return of the wheel-side oil and facilitates the oil supply to the pump.

However, the conventional low pressure accumulator having such a configuration has a problem in that the total volume of the modulator block 1 becomes large because the storage chamber 2 containing the oil is formed inside the modulator block 1. That is, the low pressure accumulator is configured such that the inner storage compartment 2 is formed long and the piston 3 has a long stroke in order to secure an appropriate amount of oil accommodation space. In the conventional low pressure accumulator, all of these components have a modulator block 1. Since it is configured inside, the overall volume of the modulator block 1 has become a cause.

The present invention is to solve the above problems, an object of the present invention is to improve the configuration and coupling structure of the low-pressure accumulator so that a part of the retracted space of the storage chamber and the piston containing the oil is located outside the modulator block It is to provide a low-pressure accumulator of the modulator block for the anti-lock brake system so that the overall volume of the can be reduced.

1 is a cross-sectional view showing a low pressure accumulator structure of a conventional modulator block.

2 is a hydraulic circuit diagram showing the overall configuration of the anti-lock brake system according to the present invention.

Figure 3 is a cross-sectional view showing a low-pressure accumulator configuration of the modulator block according to the present invention, showing a state in which the piston is advanced.

Figure 4 is a cross-sectional view showing a low-pressure accumulator configuration of the modulator block according to the present invention, showing a state in which the piston is retracted because the oil is filled therein.

Explanation of symbols on the main parts of the drawings

10: master cylinder, 20: wheel cylinder,

30: NO type solenoid valve, 31: NC type solenoid valve

40: low pressure accumulator, 41: storage compartment,

42: guide tube, 43: piston,

44: restoring spring, 45: fixing member,

45a: support jaw, 47: through portion,

50: pump, 60: high pressure accumulator,

100: modulator block, 101: receiving groove.

The low pressure accumulator of the modulator block for an anti-lock brake system according to the present invention for achieving the above object comprises an anti-lock having a low pressure accumulator for temporarily storing the brake oil returning from the wheel side of the vehicle and supplying it to the inlet side of the pump. A modulator block for a brake system, comprising: an accommodation groove recessed in the modulator block to a predetermined depth, and having an oil passage therein and one end thereof coupled to the accommodation groove, and the other end predetermined outside of the accommodation groove. A hollow guide tube extending in length, a piston installed in the guide tube in a retractable manner, a restoring spring installed in the guide tube and having one end elastically supporting the piston, and the other end of the restoring spring It is coupled to the guide tube to prevent separation of the guide tube and one side thereof It characterized in that it comprises a fixing member fixed to the modulator block.

In addition, the guide tube is coupled to the receiving groove is coupled to be coupled to the receiving groove forcibly pressed so that the oil inside does not flow out.

In addition, the fixing member is provided to surround the outer surface of the guide tube extending to the outside of the receiving groove, and having a support jaw protruding in the inner direction of the guide tube in the inner center for the support of the restoring spring It features.

In addition, a portion through which the support jaw of the fixing member is formed is provided with a through portion through which air flows in communication with the inside and outside of the guide tube.

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

In the vehicle anti-lock brake system ABS to which the present invention is applied, as illustrated in FIG. 2, the braking hydraulic pressure formed in the master cylinder 10 is transmitted to the wheel cylinders 20 installed on the front and rear wheels of the vehicle, respectively. (Iii) A plurality of solenoid valves 30 and 31 for controlling are provided, and a low pressure accumulator 40 for temporarily storing oil returned from the wheel cylinder 20 side is provided. In addition, ABS includes a pump 50 for pressurizing and recirculating oil stored in the low pressure accumulator 40, and a high pressure accumulator 60 for damping the pressure pulsation of the oil discharged from the pump 50. At this time, all of these devices are compactly embedded in the rectangular parallelepiped modulator block 100 made of aluminum (AL) material, and a plurality of flow paths are formed in the modulator block 100 to interconnect them.

The solenoid valves 30 and 31 are disposed in an upstream flow path of the wheel cylinder 20 and are normally open solenoid valves 30 (hereinafter referred to as "NO-type solenoid valves") which are normally kept open, and the wheel cylinders 20. And a normally closed solenoid valve (31, hereinafter referred to as " NC solenoid valve ") disposed downstream of the < RTI ID = 0.0 >

The low pressure accumulator 40 is disposed in a flow path connecting the downstream side of the NC type solenoid valve 31 and the pump 50 so that the decompression of the wheel cylinder 20 takes place, and the NC type solenoid valve 31 is opened. The oil returned from the wheel cylinder 20 is temporarily stored. The high pressure accumulator 60 is disposed in a passage connecting the discharge side of the pump 50 and the upstream side of the NO solenoid valve 30 to damp the pressure pulsation of oil discharged from the pump 50. ). Here, reference numeral 70 denotes an orifice for stabilizing the flow of the fluid, and 51 denotes a motor for driving the pump.

The characteristic of the modulator block 100 for ABS according to the present invention is that the total volume of the modulator block 100 is small by having a portion of the storage chamber for accommodating the oil inside the low pressure accumulator 40 is located outside the modulator block 100. It was made to lose.

Referring to FIGS. 3 and 4, an accommodating groove 101 recessed in a predetermined depth in one side of the modulator block 100 to form an oil receiving space of the low pressure accumulator 40, that is, a storage chamber 41, is provided. Is formed. At this time, the receiving groove 101 is formed through a cutting process that is usually cut in one side of the modulator block 100 in the inward direction, the flow path through which the oil flows into or out of the storage chamber 41 inside the receiving groove 101 ( 102 is formed, and the flow path 102 communicates with the flow path connecting the NC type solenoid valve 31 and the inlet side of the pump 50.

And the receiving groove 101 is coupled to the hollow guide tube 42 provided in a cylindrical shape, the guide tube 42 is coupled in the state that one end is entered into the receiving groove 101 and the other end receiving groove ( The predetermined length extends outside the 101). This allows the storage chamber 41 in which the oil is to be extended to the outside of the modulator block 100. That is, in the present invention, the inner space of the guide tube 42 forms a storage chamber 41 in which oil is accommodated. At this time, the guide tube 42 entering the inside of the receiving groove 101 is forcibly inserted through the hot pressing, etc., so that oil does not leak into the gap between the inner surface of the receiving groove 101 and the outer surface of the guide tube 42. It is desirable to avoid.

In addition, a piston 43 is provided in the guide tube 42 to retreat along the inner surface of the guide tube 42 so that the storage chamber 41 therein becomes larger or smaller in accordance with the inflow of oil. At this time, on the outer circumferential surface of the piston 43 is provided a sealing member 43a which forms an airtight structure between the guide tube 42 and the inner surface. In addition, the guide tube 42 is provided with a restoring spring 44 whose one end elastically supports the rear surface of the piston 43 to impart restoring force to the piston 43. This configuration increases the internal volume as the piston 43 is pushed by the pressure of the oil when the oil is introduced into the storage chamber 41, and is restored to its original position by the elasticity of the restoring spring 44 when the oil exits. To do so.

The outer surface of the guide tube 42 extending to the outside of the receiving groove 101 is wrapped around the guide tube 42 and protected at the same time the guide tube 42 is firmly fixed, restoring spring 44 installed inside the guide tube 42 Fixing member 45 for supporting the other end of the) is installed. The fixing member 45 has a cup shape in which one end is opened and the other end is closed to cover the outside of the guide tube 42. At this time, the closed portion of the fixing member 45 supports the guide tube 42 while the inner surface blocks the end of the guide tube 42, and also supports the other end of the restoring spring (44). Here, at the end of the fixing member 45 on which the restoring spring 44 is supported, a supporting jaw 45a protruding inwardly of the guide tube 42 is formed so that the restoring spring 44 can be inserted and supported. In the portion where the 45a is formed, a penetrating portion 47 through which the inner space of the guide tube 42 communicates with the outer space is provided. The penetrating portion 47 allows air to flow into or out of the guide tube 42 so as to smoothly move the piston 43 in the guide tube 42.

And an open end of the fixing member 45 is formed with a flange portion 45b so that the fixing member 45 can be fixed to the outer surface of the modulator block 100, the fixing bolt (46b) ) Is fastened. At this time, the fixing member 45 according to the present invention is a structure for supporting and fixing one guide pipe 42, respectively, when a plurality of low-pressure accumulator 40 is configured in the modulator block 100, a plurality of fixing parts are integrated Consists of a plurality of guide tubes may be configured to support a single fixing member. That is, although not shown in the drawings, a plurality of cup-shaped fixing parts may be formed on the flat member to simultaneously support a plurality of guide tubes.

The following describes the overall operation of the modulator block 100 for ABS to which the low pressure accumulator 40 according to the present invention is applied.

When the driver presses the brake pedal, the back pressure is generated by the pressure difference in the power supply device 11, and the braking hydraulic pressure is formed by receiving this force in the master cylinder 10, and the hydraulic pressure is applied to the NO solenoid valve 30. It is supplied to the wheel cylinder 20 on each wheel side through the braking force.

At this time, when excessive braking pressure is transmitted, the wheel of the vehicle stops rotating and slips on the road surface. This phenomenon is caused by an electronic control unit (not shown) through a wheel sensor (not shown) mounted on the wheel side of the vehicle. Is delivered). In addition, the electronic control unit opens the NC solenoid valve 31 to release oil in the wheel cylinder 20 to release the temporary braking to prevent slippage. This operation is repeatedly controlled by the electronic control unit, the brake cylinder 20 is applied to the intermittent braking pressure to achieve a stable braking.

In addition, the oil discharged through the NC-type solenoid valve 31 is moved to the low pressure accumulator 40 and stored for a while, the oil of the low pressure accumulator 40 is re-pressurized by the driving of the pump 50, the high pressure accumulator 60 ) Is discharged to the inside. The oil of the high pressure accumulator 60 is supplied to the upstream side of the NO type solenoid valve 30 after passing through the orifice 70 to form a braking pressure.

On the other hand, the oil flowing out of the NC-type solenoid valve 31 into the low pressure accumulator 40 is introduced into the storage chamber 41 through the flow path 102, as shown in Figure 4, the storage chamber 41 When the pressure of) increases, the piston 43 is pushed by the oil, thereby increasing the space for accommodating the oil. At this time, since the piston 43 is retracted along the inner surface of the guide tube 42 extending to the outside of the receiving groove 101, the storage chamber 41 can be extended to the outer portion of the modulator block 100. When the oil in the storage chamber 41 is supplied to the pump 50 side, as shown in FIG. 3, the piston 43 is advanced again by the elasticity of the restoring spring 44 and maintained in the initial state.

As described above, the low pressure accumulator 40 according to the present invention extends to the outside of the modulator block 100 through a guide tube 42 extending out of the receiving groove 101 to the outside of the modulator block 100. The volume of can be made as small as that.

As described in detail above, the low-pressure accumulator of the modulator block for the anti-lock brake system according to the present invention has an outer side of the modulator block through a storage chamber in which oil is accommodated and a guide tube in which a part of the retraction space of the piston extends to the outside of the receiving groove. By being located at, the overall volume of the modulator block is not only that small, thereby reducing the manufacturing cost of the modulator block, and there is an effect of easily mounting the modulator block to the vehicle.

Claims (5)

In the modulator block for an anti-lock brake system having a low pressure accumulator for temporarily storing the brake oil returning from the wheel side of the vehicle and supplying it to the inlet side of the pump, A recessed groove formed in the modulator block at a predetermined depth and having a flow path for oil in and out therein, and a hollow guide tube having one end coupled to the accommodation groove and the other end extending a predetermined length to the outside of the accommodation groove; And a piston installed in the guide tube so as to be retracted and installed in the guide tube, one end of which is supported by a resilient spring for elastically supporting the piston, and the other end of the resilient spring, to prevent separation of the guide tube. The low pressure accumulator of the modulator block for the anti-lock brake system, characterized in that it comprises a fixing member coupled to the guide tube and one side thereof is fixed to the modulator block. The method of claim 1, The low pressure accumulator of the modulator block for the anti-lock brake system, characterized in that the guide pipe is press-fitted to the receiving groove. The method of claim 1, The fixing member is provided to surround the outer surface of the guide tube extending to the outside of the receiving groove, characterized in that it has a supporting jaw protruding in the inner direction of the guide tube in the inner center for the support of the restoring spring Low pressure accumulator of the modulator block for the anti-lock brake system. The method of claim 3, The low pressure accumulator of the modulator block for the anti-lock brake system, characterized in that the through-hole portion through which the inside and the outside of the guide tube is communicated with the support jaw of the fixing member is provided. The method of claim 1, The fixing member is a low-pressure accumulator of the modulator block for the anti-lock brake system, characterized in that the fixing part for supporting the guide tube is provided to support a plurality of guide tubes at the same time.