KR100379920B1 - Brake oil pressure control system with middle pressure accumulator for automobile - Google Patents

Abstract

The present invention relates to a brake hydraulic pressure control device for a vehicle having a medium pressure accumulator, the object of which is to make the hydraulic block more compact and at the same time to reduce the manufacturing cost.

According to the brake hydraulic pressure control device for a vehicle having a medium pressure accumulator 32 according to the present invention, the medium pressure accumulator 32 is separately formed and mounted on the hydraulic block 60 as a cartridge type. Therefore, the hydraulic block 60 can be more compactly configured and at the same time can be easily manufactured, thereby reducing the overall manufacturing cost of the brake hydraulic pressure control device for a vehicle.

Description

Brake oil pressure control system with middle pressure accumulator for automobile

The present invention relates to a vehicle brake hydraulic pressure control device, and more particularly to a vehicle brake hydraulic pressure control device having a medium pressure accumulator provided in the hydraulic block so that the hydraulic pressure is temporarily filled through the hydraulic pump.

In general, the vehicle is equipped with a wheel brake for braking the front and rear wheels for the purpose of deceleration or stopping while driving, and a booster and a master cylinder for forming the braking hydraulic pressure and transmitting the brake to the wheel brake side. The hydraulic pressure generated at is transferred to the wheel brake to generate a braking force. However, when the driver presses the brake pedal to control the increase / sustainment of the braking force, if the braking pressure is greater than the road surface state, or if the friction force of the wheel brake generated by the braking pressure is greater than the braking force generated from the tire or the road surface, the tire is on the road surface. Slipping occurs at the

Therefore, in recent years, anti-lock brake system (ABS), which prevents slippage of the wheel during braking, and vehicles to effectively prevent slip phenomenon and to exhibit strong and stable braking force and to facilitate driving operation. The brake traction control system (BTCS) prevents excessive slippage of the driving wheel during sudden start or acceleration and when the vehicle is not adjusted according to the driver's will by the force applied from the outside during the high speed driving of the vehicle. A brake hydraulic pressure control device having a vehicle dynamic control system (VDC) function for developing a stable driving condition of a vehicle by controlling a brake hydraulic pressure by combining a lock brake system and a traction control has been developed.

The brake hydraulic control device for a vehicle includes a hydraulic unit equipped with a plurality of solenoid valves, low pressure accumulators, and high pressure accumulators, which are mounted on the hydraulic block to control the braking hydraulic pressure delivered to the wheel brake side. Equipped with an electronic control unit (ECU) for controlling.

The solenoid valve is divided into a NO type solenoid valve disposed upstream of the wheel brake and an NC type solenoid valve disposed downstream, and controlled by an electronic controller. That is, the electronic controller detects the vehicle speed through each wheel sensor disposed at the front wheel and the rear wheel, thereby controlling the opening and closing operation of each solenoid valve. In addition, the low pressure accumulator is independently provided on the downstream side of the NC type solenoid valve so that the oil escaping from the wheel brake side is temporarily stored in the decompression mode, and the high pressure accumulator is a type of damping chamber, which is arranged in series with the discharge side of the pump described later. .

In addition, the hydraulic block bypasses the solenoid valve, the medium pressure accumulator in which the brake fluid is accumulated in addition to the low pressure and high pressure accumulator, the motor, the pump for forcibly pumping the oil stored in the low pressure accumulator, and the brake fluid discharged from the pump to the suction side. The flow path for making it come is provided. A medium pressure accumulator for accumulating the brake fluid discharged from the pump is disposed in this bypass flow path.

On the downstream side of the medium pressure accumulator, an NC type solenoid valve is additionally provided which is opened by the electronic control unit during the operation of the traction control or the vehicle attitude control. A relief valve is provided upstream of the medium pressure accumulator. This relief valve is for returning the hydraulic pressure which has risen more than necessary in traction control or vehicle position control to the oil storage tank of the master cylinder. Such a medium pressure accumulator is integrated in the hydraulic block together with the low pressure and the high pressure accumulator.

Accordingly, in the conventional brake hydraulic pressure control apparatus, as shown in FIG. 1, a part of the side surface of the hydraulic block 1 is protruded for the construction of the medium pressure accumulator 2, and the cylinder 2a is formed through the boring process. do. The cylinder 2a is provided with a piston 2b for moving forward and backward, an elastic member 2c for elastically supporting the piston 2b, a plug 2d for closing the opening of the cylinder 2a, and the like. do. Reference numeral 3 denotes a motor for driving a pair of pumps (not shown).

As described above, in the related art, the cylinder 2a must be directly processed on the hydraulic block 1 in order to configure the medium pressure accumulator 2, which makes manufacturing difficult and of course, increases the overall manufacturing cost of the brake hydraulic pressure control device. There is a limit to making the hydraulic block 1 compact.

The present invention is to solve this problem, an object of the present invention is to install a medium pressure accumulator in the hydraulic block in the cartridge method, it is possible to configure the hydraulic block more compact and at the same time reduce the overall manufacturing cost of the brake hydraulic pressure control device To provide a brake hydraulic pressure control device for vehicles equipped with a medium pressure accumulator.

1 is a side view showing a hydraulic block used in a conventional brake fluid pressure control device for a vehicle.

2 is a hydraulic system diagram of a brake hydraulic pressure control device for a vehicle to which the present invention is applied.

Figure 3 is a side view of the hydraulic block of the brake hydraulic pressure control device for a vehicle according to the present invention.

4 is a front view of the hydraulic block viewed from the direction A of FIG. 3.

FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4, showing an internal structure of the medium pressure accumulator according to the present invention.

6 is an exploded perspective view of the medium pressure accumulator according to the present invention.

* Description of the symbols for the main parts of the drawings *

32 .. Medium pressure accumulator 32a .. Housing

32b.cylinder 34.piston

35. Elastic member 36. Plug

37..Mounting bolt 54..Bypass Euro

60. Hydraulic block 61. Connection port

The present invention for achieving this object is;

A pump built in the hydraulic block for sucking the brake fluid and pumping it to the wheel brake side of the wheel, a bypass flow path formed in the hydraulic block to bypass the hydraulic pressure discharged from the pump to the suction side, and linked with the bypass flow path. In the brake hydraulic pressure control device for a vehicle having a medium pressure accumulator provided in the hydraulic block so that the brake fluid is accumulated,

The medium pressure accumulator includes a housing having a cylinder formed therein to allow the brake fluid to flow therein, a piston embedded in the cylinder to move back and forth as the brake fluid enters and exits, an elastic member elastically supporting the piston in the axial direction, and the elastic member. And a plug that is inserted into and coupled to the cylinder to support the cylinder, and mounting means for mounting the housing to the hydraulic block such that the cylinder communicates with the bypass flow path.

The mounting means may include an outward flange integrally provided in the housing and a mounting bolt for directly connecting the outward flange to the hydraulic block.

In addition, the hydraulic block is provided with a connection port in which the bottom surface is in communication with the bypass flow path, and the housing is provided with an insertion portion which is perforated and connected to the connection port so as to communicate with the cylinder.

In addition, the outer peripheral portion of the insertion portion is characterized in that the sealing member is provided for the sealing coupling with the inner peripheral of the connection port.

According to this configuration, by manufacturing the medium pressure accumulator separately and mounted on the hydraulic block, the hydraulic block can be configured more compactly, and the overall manufacturing cost of the brake hydraulic pressure control device can be reduced.

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

2, the vehicle brake hydraulic pressure control apparatus according to the invention a plurality of solenoids for controlling the braking hydraulic pressure delivered to the wheel brake 14 side installed on the front wheel (FR) (FL) and the rear wheel (RR) (RL). To the valves 20a and 20b, a pair of low pressure accumulators 30 in which oil from the side of the wheel brake 14 is temporarily stored during the decompression braking operation, and a low pressure accumulator 30 in the case of boosting and maintaining braking operation. A motor 40 and a pair of pumps 41 for pumping the stored oil, and a pair of directly connected to the discharge side of each pump 41 to reduce pressure pulsation of oil pressurized and discharged by driving the pump 41. A high pressure accumulator 31 and a medium pressure accumulator 32 in which the brake fluid discharged from the pump 41 is accumulated are accumulated, and these are compactly installed in a hydraulic block 60 (see FIG. 3) described later.

The plurality of solenoid valves are connected to the upstream and downstream sides of the wheel brakes 14, and are normally open solenoid valves (20a, hereinafter referred to as NO solenoid valves) which are disposed upstream and are normally kept open. They are distinguished from normal closed solenoid valves (20b, hereinafter referred to as NC solenoid valves) which are disposed downstream and are normally kept closed. The opening and closing operation of the solenoid valves 20a and 20b is an electronic control device (not shown) which detects the vehicle speed through a wheel sensor (not shown) disposed at the front wheel FR and the rear wheel RR RL. The oil is released from the wheel brake 14 side by the NC-type solenoid valve 20b is opened in accordance with the decompression braking action is temporarily stored in the low-pressure accumulator (30).

The pair of pumps 41 have a predetermined phase difference by the motor 40 and are simultaneously driven to discharge oil stored in the low pressure accumulator 30 to the pressurized high pressure accumulator 31, and the oil introduced into the high pressure accumulator 31. The pressure pulsation is reduced while being delivered to the wheel brake 14 side again along the hydraulic line or returned to the master cylinder 12.

In addition, the NO type solenoid valve 51a is installed in the first passage 51 connecting the master cylinder 12 having the oil storage tank 13 to the discharge side of the pump 41. The NO type solenoid valve 51a is normally maintained in an open state so that the brake hydraulic pressure formed in the booster 11 and the master cylinder 12 passes during the normal braking action through the brake pedal 10, and the brake described later. During the traction control and vehicle attitude control operation, it is closed by the electronic controller.

Meanwhile, a first relief valve 52a is installed in another second flow path 52 connecting between the discharge side of the pump 41 and the master cylinder 12, which is a pump 41 during traction control or vehicle posture control. When the brake hydraulic pressure discharged from the rises more than necessary, the brake fluid is to reflux to the master cylinder 12 side. In addition, a third flow passage 53 connecting the master cylinder 12 and the pump 41 to the suction side thereof is provided, and an NO type electric shuttle valve 53a is provided in the middle of the third flow passage 53.

In addition, a bypass flow path 54 for bypassing the discharged brake fluid pressure of the pump 41 to the suction side thereof is provided, and a medium pressure accumulator 32 is provided in the bypass flow path 54 to accumulate predetermined brake fluid. . In addition, the NC-type solenoid valve which maintains the accumulated pressurized brake fluid on the downstream side of the medium pressure accumulator 32 and is opened during brake traction control or vehicle control to communicate the suction side of the medium pressure accumulator 32 and the pump 41 ( 54b). In addition, a second pressure upstream side of the medium pressure accumulator 32 for refluxing the brake hydraulic pressure discharged from the pump 41 when the brake traction control or vehicle posture control rises above a predetermined pressure required for the control to the medium pressure accumulator 32 side. A relief valve 54a is provided. Further, the first flow path 51, the second flow path 52, the third flow path 52, the bypass flow path 54, and the like are formed in the hydraulic block 60 through a drilling process or the like.

Therefore, since the brake fluid in the state accumulating from the medium pressure accumulator 32 together with the brake fluid in the low pressure accumulator 30 is supplied to the suction side of the pump 41 during the vehicle attitude control operation, the pump 41 efficiency is not only increased. It is possible to supply the appropriate brake hydraulic pressure required for each wheel brake 14 more quickly by increasing the speed of raising the brake hydraulic pressure.

The medium-pressure accumulator 32 that performs this function is manufactured separately and mounted in a cartridge type on the hydraulic block 60 made of aluminum, so that the hydraulic block 60 can be more compactly configured, see FIGS. 3 to 6. The detailed structure thereof is as follows.

First, a motor 40 for simultaneously driving a pair of pumps 41 (see FIG. 2) is installed on one side of the hydraulic block 60, and a pair of lower sides of one side of the hydraulic block 60 is installed. A connection port 61 is provided to mount the medium pressure accumulator 32. The connection port 61 is formed by looking at the side surface of the hydraulic block 60, the bottom of which is in communication with the bypass flow path (54). In addition, a female screw 62 is processed in the hydraulic block 60 adjacent to the connection port 61 so as to directly connect a mounting bolt 37 to be described later.

In addition, the medium pressure accumulator 32 includes a housing 32a having a cylinder 32b formed therein so that the brake fluid flows in and stored therein, a piston 34 embedded in the cylinder 32b, and an elastic support for elastically supporting the piston 34. A member 35, a plug 36 coupled to the opening of the cylinder 32b, and mounting means for mounting the housing 32a to the hydraulic block 60 are provided.

The housing 32a has a cylindrical shape in which the rear end is opened and the cylinder 32b is formed in the axial direction through boring. An insertion part 32c is inserted into the connection port 61 and coupled to the front end of the housing 32a, and the insertion part 32c is provided with a connection flow path 32d in the axial direction so as to communicate with the cylinder 32b. In addition, a sealing member 33 is disposed on the outer circumference of the insertion portion 32c to prevent leakage of the brake fluid through a gap between the connection port 61. Sealing member 33 is composed of a kind of O-ring made of an elastic material.

The piston 34 moves forward and backward as the brake fluid enters and exits, which is elastically supported by the elastic member 35. That is, the piston 34 is elastically supported in the axial direction by the elastic member 35 made of the coil spring, and the elastic member 35 is supported by the plug 36 blocking the opening of the cylinder 32b. The plug 36 is firmly fitted to the opening of the cylinder 32b through the press-in ring 36a to support the elastic member 35. Reference numeral “36b” is an air vent hole drilled in the bottom surface of the plug 36.

The mounting means includes a pair of outward flanges 32e provided radially symmetrically on the outer periphery of the distal end of the housing 32a and a mounting bolt 37 for directly connecting the outward flanges 32e to the hydraulic block 60. do. A fastening hole 32f is provided in the outward flange 32e so as to correspond to the female screw 62 provided in the hydraulic block 60.

Therefore, the insertion part 32c is inserted into the connection port 61, and the housing 32a is preassembled to the hydraulic block 60 so that the female screw 62 and the fastening hole 32f coincide with each other. When the mounting bolt 37 is fastened to the female screw 62, the medium pressure accumulator 32 is easily and firmly assembled to the hydraulic block 60, as shown in FIG. 5.

At this time, the sealing member 33 disposed on the outer circumference of the insertion portion 32c is compressed, thereby preventing the leakage of brake fluid through the gap between the connection port 61 and the insertion portion 32c, thereby preventing the leakage of the housing 32a. The cylinder 32b communicates with the bypass flow path 54 through the connection flow path 32d.

As described in detail above, according to the brake hydraulic pressure control apparatus for a vehicle having a medium pressure accumulator according to the present invention, the medium pressure accumulator is separately formed and mounted on the hydraulic block as a cartridge type. Therefore, the hydraulic block can be more compactly configured and at the same time can be easily manufactured, thereby reducing the overall manufacturing cost of the brake hydraulic pressure control device for the vehicle.

Claims (4)

A pump built in the hydraulic block for sucking the brake fluid and pumping it to the wheel brake side of the wheel, a bypass flow path formed in the hydraulic block to bypass the hydraulic pressure discharged from the pump to the suction side, and linked with the bypass flow path. In the brake hydraulic pressure control device for a vehicle having a medium pressure accumulator provided in the hydraulic block so that the brake fluid is accumulated, The medium pressure accumulator is; A housing having a cylinder formed therein to allow the brake fluid to flow therein, a piston built in the cylinder to move back and forth as the brake fluid enters and exits, an elastic member elastically supporting the piston in the axial direction, and the elastic member to support the elastic member And a mounting means for mounting the housing to the hydraulic block so that the cylinder is in communication with the bypass flow path, the plug being fitted to the open portion and coupled to the cylinder. The method of claim 1, The mounting means, An outward flange integrally provided in the housing; And a mounting bolt for directly connecting the outward flange to the hydraulic block. The method of claim 1, The hydraulic block is provided with a connection port in which the bottom surface is in communication with the bypass flow path, The housing fluid pressure control device for a vehicle with a medium pressure accumulator, characterized in that the connection passage is bored so as to communicate with the cylinder is inserted into the connection port. The method of claim 3, wherein The brake hydraulic pressure control device for a vehicle with a medium pressure accumulator, characterized in that the sealing member is provided on the outer circumference of the insert portion for sealing coupling with the inner circumference of the connection port.