KR100379921B1 - Modulator block for anti-lock brake system for vehicle - Google Patents

Abstract

The present invention relates to a modulator block for an anti-lock brake system, in particular to facilitate the discharge of air remaining in the modulator block and oil filling into the hydraulic circuit in the modulator block.

To this end, the present invention provides a hydraulic pump for repressurizing and discharging oil returned from a wheel cylinder on a wheel side, a bypass flow path connecting an outlet flow path of the hydraulic pump and an inlet flow path of the hydraulic pump, and a medium pressure provided in the bypass flow path. In the modulator block for an anti-lock brake system including an accumulator, an oil injection port communicating with the outside of the modulator block and a circulating oil path to drain air remaining in the medium pressure accumulator or to inject oil into the medium pressure accumulator, and It includes a non-return valve mounted to the oil injection port to prevent the reverse flow.

Description

Modulator block for anti-lock brake system {MODULATOR BLOCK FOR ANTI-LOCK BRAKE SYSTEM FOR VEHICLE}

The present invention relates to a modulator block for an anti-lock brake system, and more particularly, to a modulator block for an anti-lock brake system that facilitates the discharge of air remaining in the modulator block and oil filling into the hydraulic circuit in the modulator block. .

Recently developed vehicle braking device to control the brake hydraulic pressure to facilitate the operation of the driving vehicle, there is an anti-lock brake system (ABS) to prevent the slip of the wheel during braking. Among these antilock brake systems, a Traction Control System (TCS), which prevents excessive slippage during sudden start and acceleration of the vehicle, and the vehicle may not be adjusted according to the driver's will, such as when driving at high speeds on a curved road. Some include a vehicle dynamic control (VDC) system to control the brake hydraulic pressure to ensure a stable driving state.

This vehicle anti-lock brake system is composed of a hydraulic circuit provided in the modulator block, the hydraulic circuit is braking hydraulic pressure supplied from the master cylinder (1) to the wheel-side wheel cylinder (2) of the vehicle, as shown in FIG. Solenoid valves 3 and 4 for regulating the pressure, hydraulic pumps 5 for repressurizing oil returning from the wheel side, and low pressure accumulators disposed in the upstream and downstream flow paths of the hydraulic pump 5 for accumulating oil. (6) and the high pressure accumulator (7).

In addition, the hydraulic circuit in the modulator block (not shown) constitutes the traction control system described above, and connects the first bypass passage 8a connecting the outlet side flow path of the master cylinder 1 and the inlet side of the hydraulic pump 5. And an electric shuttle valve 8 for opening and closing, and a traction control solenoid valve 9 installed in a flow path connected between the outlet side of the master cylinder 1 and the outlet side of the high-pressure accumulator 7 and maintaining the normally open state. . In addition, in the reflux passage 10a which communicates the outlet side of the master cylinder 1 with the outlet side of the high-pressure accumulator 7, the master fluid 1 receives brake fluid when the hydraulic pressure discharged from the hydraulic pump 5 is higher than necessary. A first relief valve 10 for reflux is provided.

In addition, the hydraulic circuit constitutes the above-described attitude control system, and is provided with a second bypass passage 11a for communicating the suction side of the hydraulic pump 5 from the discharge side of the hydraulic pump 5, and the second bypass passage. In the middle of 11a, a medium pressure accumulator 11 in which a predetermined hydraulic pressure is accumulated is provided. In addition, a posture control solenoid valve 13 for opening and closing the flow path is provided on the downstream second bypass flow path 11a of the medium pressure accumulator 11, and the hydraulic pump is disposed on the upstream second bypass flow path 11a of the medium pressure accumulator 11. When the discharge side hydraulic pressure of (5) is higher than or equal to a predetermined pressure, a second relief valve 12 is provided to open the flow path so that the brake fluid is filled in the medium pressure accumulator 11.

On the other hand, since the anti-lock brake system of such a configuration is composed of one modulator block, a plurality of components constituting the hydraulic circuit is provided in a structure that is usually embedded in the modulator block so as to be connected to the flow path in the modulator block. When the modulator block is mounted on the vehicle so that the modulator block is connected to the braking device of the vehicle, the modulator block is installed with oil filled in the hydraulic circuit in the modulator block.

In particular, since the heavy-pressure accumulator 11 in the hydraulic circuit must be mounted in a state filled with oil to function properly, conventionally, when mounting the modulator block to a vehicle, a method of filling the oil after releasing air in the modulator block has been taken.

However, the conventional anti-lock brake system modulator block having such a configuration has a problem that the installation time of the modulator block is lengthened because the operation of forcibly injecting oil after removing the internal air by using a vacuum pump or the like in the process of mounting the vehicle has been performed. there was.

In addition, in the conventional configuration, when the oil is filled in the medium pressure accumulator 11, the oil in a state in which the attitude control solenoid valve 13 installed on the downstream side of the medium pressure accumulator 11 and the second relief valve 12 installed on the upstream side are opened. Since it is necessary to inject, it has been a hassle to provide separate control equipment for controlling the opening operation of the solenoid valve 13 and the second relief valve 12 for the attitude control of the modulator block in the line for manufacturing a vehicle.

The present invention is to solve such a problem, an object of the present invention is to provide an oil injection port in communication with the outside on the flow path associated with the medium-pressure accumulator to easily take out the air inside the oil injection port as well It is to provide a modulator block for the anti-lock brake system to fill the oil.

1 is a system diagram showing a hydraulic circuit of a conventional anti-lock brake system.

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

3 is a partial cross-sectional view of a modulator block for an anti-lock brake system according to the present invention, showing the configuration of an oil injection port.

Explanation of symbols on the main parts of the drawings

34: second bypass euro, 35: medium pressure accumulator,

36: solenoid valve for position control, 37: second relief valve,

40: oil injection port, 50: non-return valve,

51: valve body, 52: sphere,

53: support spring, 54: support member,

55: stopper, 100: modulator block.

Modulator block for the anti-lock brake system according to the present invention for achieving this object is a hydraulic pump for repressurizing and discharging oil returned from the wheel cylinder on the wheel side, the outlet side flow path of the hydraulic pump and the inlet of the hydraulic pump In the anti-lock brake system modulator block including a bypass flow path for connecting the side flow path, a medium pressure accumulator provided in the bypass flow path, so that the outside of the modulator block and the flow path flow so as to inject oil into the medium pressure accumulator It characterized in that it comprises a formed oil injection port, and a non-return valve provided in the oil injection port.

In addition, the non-return valve may be a hollow valve body press-fitted to the oil injection port, a sphere which is installed in the valve body to be retractable to open and close the flow path, a support spring for elastically supporting the sphere in one direction, and the support It characterized in that it comprises a support member for supporting one end of the spring.

In addition, the inlet of the flow path formed in the valve body is characterized in that the opening and closing stopper is installed.

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

As shown in FIG. 2, the hydraulic circuit for the anti-lock brake system according to the present invention includes a master cylinder 20 for generating braking pressure by the operation of the brake pedal 20a provided at one side of the driver's seat, and a wheel side of the vehicle. The wheel cylinder 21 is installed.

In addition, the hydraulic circuit includes a normal open solenoid valve 22 installed in the middle of the hydraulic line connected from the master cylinder 20 to the wheel cylinder 21 on the wheel side, and a return flow path where the brake fluid returns from the wheel side. Normally closed solenoid valve 23 is provided. In the middle of the return passage 24 returning from the wheel side, the low pressure accumulator 25 temporarily storing the brake fluid refluxed from the wheel side, and a hydraulic pump for forced circulation by pumping the brake fluid stored in the low pressure accumulator 25 ( 26, a high pressure accumulator 27 and an orifice 28 are provided at the outlet of the hydraulic pump 26 to damp the pulsation of the pumped brake fluid.

In addition, a traction control solenoid valve 29 is provided in the middle of the flow path connecting the outlet side of the hydraulic pump 26 and the outlet side of the master cylinder 20 to prevent slippage of wheels caused by sudden start and departure of the vehicle. In addition, between the inlet side of the traction control solenoid valve 29 and the inlet side of the hydraulic pump 26, a first bypass passage 30 through which the brake oil of the master cylinder 20 is supplied to the inlet side of the hydraulic pump 26 is provided. The first bypass passage 30 is provided with an electric shuttle valve 31 for opening and closing it. In addition, in the reflux passage 32 communicating the outlet side of the master cylinder 20 from the outlet side of the high pressure accumulator 27, the brake oil is applied to the master cylinder 20 when the hydraulic pressure discharged from the hydraulic pump 26 is higher than necessary. A first relief valve 33 for reflux is installed.

The hydraulic circuit is for controlling the attitude of the vehicle during high-speed driving, and includes a second bypass passage 34 communicating the inlet side of the hydraulic pump 26 from the outlet side of the high-pressure accumulator 27. In the middle of the bypass passage 34, a medium pressure accumulator 35 is installed in which a predetermined amount of oil is accumulated. In addition, a posture control solenoid valve 36 for opening and closing a flow path is provided on the downstream second bypass flow path 34 of the medium pressure accumulator 35 and on the upstream second bypass flow path 34 of the medium pressure accumulator 35. When the outlet pressure of the hydraulic pump 26 is equal to or higher than the predetermined pressure, a second relief valve 37 is provided to open the flow path so that the brake oil is filled in the medium pressure accumulator 35. Although not shown in the drawing, the anti-lock brake system reads the wheel speed from the wheel speed sensor, and calculates, analyzes, and determines it according to a preset program, and has an electronic control device that controls the operation of each device based on the result. do.

The vehicle anti-lock brake system having such a configuration has a normal open type and a normal closed solenoid valve 22 and 23 alternately opened and closed by the control of an electronic controller (not shown) when the driver steps on the brake pedal 20a. The braking hydraulic pressure supplied is interrupted, and at the same time, the hydraulic pump 26 is driven to re-pressurize the fluid returned along the return flow passage to prevent intermittent braking on the wheel side, thereby preventing road slippage of the wheel. At this time, the electric shuttle valve 31 is kept closed.

When the driver detects slippage on the wheels due to excessive starting of the vehicle regardless of the operation of the brake pedal 20a, the hydraulic pump 26 is driven through the control of the electronic controller to apply braking pressure to the wheels. . At this time, since the traction control solenoid valve 29 is closed and the shuttle valve 31 is opened, the brake oil at the outlet side of the master cylinder 20 is supplied to the hydraulic pump 26 via the shuttle valve 31, and the hydraulic pump 26. ) Pressurizes the brake to prevent the wheel from slipping. In this case, when the outlet side braking hydraulic pressure of the hydraulic pump 26 is too high, the first relief valve 33 is opened so that the brake oil is returned to the master cylinder 20 so that the braking pressure applied to the wheel side is always maintained in an appropriate state. .

In addition, when the attitude control of the vehicle is required such as when the vehicle is traveling at a high speed on a curved road, the solenoid valve 36 for attitude control is opened and the brake oil accumulated in the medium pressure accumulator 35 is supplied to the inlet side of the hydraulic pump 26. do. In addition, the hydraulic pump 26 pressurizes the brake to allow stable driving of the vehicle. At this time, the traction control solenoid valve 29 maintains a closed state.

On the other hand, since the vehicle anti-lock brake system having such a configuration and operation is composed of an integral modulator block made of aluminum, when the vehicle is mounted on the vehicle so that the modulator block is connected to the braking device of the vehicle, oil is applied to the hydraulic circuit in the modulator block. It is installed with oil filled to fill this. However, since the hydraulic circuit inside the modulator block is configured to form a closed circuit, there is a difficulty in filling oil into the medium pressure accumulator 35, and the present invention provides a medium pressure accumulator (from the outside of the modulator block to facilitate oil filling of the medium pressure accumulator 35). 35) is provided with a separate oil injection port 40 that can directly inject the oil.

That is, as shown in the hydraulic circuit of FIG. 2, an oil injection port 40 extending from the second bypass passage 34 communicating with the medium pressure accumulator 35 to the outside of the modulator block is provided. 40 is to install a non-return valve 50 for preventing the back flow of the oil injected into.

Figure 3 is a partial cross-sectional view of the modulator block according to the present invention having such a hydraulic circuit, showing the configuration of the oil injection port. In this case, a second bypass passage 34 is provided on one side of the modulator block 100 so as to be connected to an internal flow passage, and one side of the outer surface of the modulator block 100 to communicate with the second bypass passage 34. The medium pressure accumulator 35 is mounted. At this time, the medium-pressure accumulator 35 has a housing 35a in which a compression chamber is formed to form a storage space for oil therein, a piston 35b installed in a retractable manner within the housing 35a, and an elastic member for elastically supporting the piston 35b. It includes 35c, the inlet 35d provided on one side of the compression chamber is coupled to the modulator block 100 to communicate with the second bypass flow path (34).

The oil injection port 40 is formed so that the outer surface of the modulator block 100 communicates from the second bypass passage 34 so that oil can be injected into the medium pressure accumulator 35, and the oil injection port 40 is press-fitted from the outside. The non-return valve 50 is installed.

The non-return valve 50 may be installed in the valve body 51 and the valve body 51 in which a flow path 51a is formed at the center thereof so as to move forward and backward to open and close the flow path 52 and the sphere 52. It includes a support spring 53 for elastically supporting, and a support member 54 for supporting one end of the support spring (53). At this time, the flow passage (51a) of the valve body 51 is formed so that one side close to the inlet is smaller than the outer diameter of the sphere (52) to open and close the flow passage (51a) through the advancing of the sphere (52). In addition, one end of the support spring 53 is supported by the sphere 52 and the other end is supported by the support member 54 so that the passage 51a in the valve body 51 is normally maintained in a closed state. In addition, the inlet of the flow path (51a) formed in the valve body 51 is provided with an opening and closing stopper 55 to close the inlet of the valve body 51 after the oil is injected, the stopper 55 is stretched It is preferable that the elastic material be provided as possible.

The modulator block 100 for the anti-lock brake system having such a configuration is mounted on the vehicle after the manufacturing step is completed, and the operator fills the oil into the hydraulic circuit inside the modulator block 100. In this case, the oil can be directly injected from the outside of the modulator block 100 using the oil injection port 40 described above, so that the oil filling to the medium pressure accumulator 35 is facilitated.

In more detail, when the operator opens the stopper 55 installed in the non-return valve 50 of the oil injection port 40 and injects oil at a predetermined pressure, the sphere 52 of the non-return valve 50 is injected. The oil passage 51a is opened while being pushed by the pressure of the oil to be filled, and the oil injected through the open oil passage 51a is filled in the medium pressure accumulator 35. When the operator finishes the injection of oil, since the sphere 52 of the non-return valve 50 is pushed in the opposite direction by the elasticity of the support spring 53 and closes the flow path 51a, leakage of the filled oil is prevented. . In addition, after the oil filling operation is completed, the operator can block the inlet again by using the stopper 55 to further increase the leakage preventing effect of the oil, and also to block the inflow of foreign substances into the oil injection port.

In addition, the present invention may inject the oil in the state in which the operator removes the air inside through the oil injection port 40 when performing the oil injection operation. In this case, the operator pushes the sphere 52 of the non-return valve 50 inwardly using a sharp tip tool to secure the flow path 51a, and thereafter, may extract air from the inside using a vacuum pump (not shown). After removing the air, the oil may be injected into the modulator block 100 through the oil injection method described above.

As described in detail above, the anti-lock brake system modulator block according to the present invention is provided with an oil injection port communicating with the outside on the flow path associated with the medium-pressure accumulator and provided with a non-return valve at the oil injection port, Through the injection port, the air inside the modulator block can be easily drawn out, and oil can be easily filled into the modulator block through the oil injection port.

Claims (3)

A hydraulic pump for repressurizing and discharging oil returned from the wheel cylinder on the wheel side, a bypass flow path connecting the outlet flow path of the hydraulic pump and the inlet flow path of the hydraulic pump, and a medium pressure accumulator provided in the bypass flow path. In the modulator block for the anti-lock brake system, Modulator block for the anti-lock brake system, characterized in that it comprises an oil injection port formed so that the outside of the modulator block and the flow path to communicate with the medium pressure accumulator, and a non-return valve provided in the oil injection port . The method of claim 1, The non-return valve may be a hollow valve body press-fitted to the oil injection port, a sphere installed in the valve body to be retractable to open and close a flow path, a support spring for elastically supporting the sphere in one direction, and the support spring. Modulator block for an anti-lock brake system comprising a support member for supporting one end. The method of claim 2, Modulator block for the anti-lock brake system characterized in that the opening and closing stopper is installed at the inlet of the flow path formed in the valve body.