KR100427632B1 - Brake master cilinder for a vehicle - Google Patents

Abstract

The present invention relates to a brake master cylinder for an automobile, comprising: a main body provided in the master bag and having first and second cylinders arranged in parallel with respect to a partition wall having a center guide groove formed thereon, and having a hydraulic discharge hole formed at a rear end thereof; First and second piston cups which are fastened to a central portion by a coupling rod and installed to move while applying a compressive force to the return spring in the first and second cylinders; A piston rod connected to each engaging rod thereof; A connecting rod vertically connected to the push rod and coupled to each piston rod at equal intervals above and below; The center rod is inserted into the center guide groove of the body bulkhead and is fastened to the center of the connecting rod. According to the present invention, the brake pedal stroke is reduced by half because the piston arrangement in the master cylinder is made in parallel. It is possible to maximize the power and at the same time obtain excellent braking force.

Description

Brake master cylinder for automobile. {Brake master cilinder for a vehicle}

The present invention relates to a brake master cylinder for a vehicle, and more particularly, to a brake master cylinder of a vehicle that can improve the braking force by expanding the dimensional change width of the master cylinder more and at the same time maximize the user's sense of brake operation. .

In general, a brake master cylinder for an automobile generates oil required when the brake pedal is pressed, and presses the oil to each wheel cylinder. A conventional brake master cylinder is shown in FIG. 2) is integrally provided in the cylinder body 3, the pressure outlet (7a, 7b) is formed in which the brake oil is discharged and the return spring (6a, 6b) in series in the longitudinal direction in the body (3) The first and second pistons 5a and 5b which are installed to move forward and backward and apply pressure to the pistons 5a and 5b in the main body 3 by the pedaling force of the brake pedal 1. It is composed of a brake oil tank (4) for supplying oil into the rod (6) and the body (3).

Therefore, when the user presses the brake pedal 1, the force exerted on the push rod 6 by the negative pressure in the master bag 2 pushes the first and second pistons 5a and 5b to generate a predetermined inflow in the main body. This hydraulic pressure is transmitted to the wheel cylinder (not shown) of each wheel through the pressure outlets 7a and 7b to generate the braking force. After releasing the stepping force on the brake pedal 1, it is restored by the return springs 6a and 6b.

However, since the conventional master cylinder as described above has a structure in which the pistons are connected in series in the main body, it is assumed that the displacement distance of one pure piston required for generating pressure for proper braking force is, for example, 7 mm. Since this is connected in series, the moving distance of the push rod in consideration of the moving distance of the piston is 14 mm. In addition, if the normal brake pedal ratio is 4, the moving distance of the push rod becomes 56 mm, and thus the displacement of the push rod is relatively large. There was a problem amplified.

In addition, when the inner diameter of the master cylinder body is reduced in order to increase the braking force of the wheel, the operation feeling of the pedal is remarkably decreased due to the increase of the stroke of the brake pedal, thereby causing inconvenience to the user, while reducing the friction coefficient of the brake friction material. Although it is possible to increase the braking force by setting it high, this also has a problem in that brake noise is generated due to a high coefficient of friction of the friction material and vibration of the vehicle body (Judder) is caused during braking.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to configure the piston arrangement in the brake master cylinder in parallel to improve the braking force and at the same time can maximize the user's brake operation feeling To provide a brake master cylinder.

Still another object of the present invention is to provide a brake master cylinder for a vehicle that can suppress vehicle shaking and reduce brake noise during braking.

Still another object of the present invention is to provide an automobile brake master cylinder capable of oil change work by mounting an angle change pin in the brake master cylinder.

1 is a schematic cross-sectional view showing the structure of a conventional brake master cylinder.

Figure 2 is a schematic cross-sectional view showing the structure of a brake master cylinder according to the present invention.

Explanation of symbols on the main parts of the drawings

10: brake pedal 20: master bag

30 (cylinder) main body 31a, 31b: 1st, 2nd cylinder

32a, 32b: piston cup 33a, 33b: return spring

34a, 34b: Hydraulic discharge hole 35a, 35b: Pressure outlet

37a, 37b: engagement rod 38a, 38b: piston rod

39: angle change pin 40: push rod

50: connection rod 52: center load

54: bulkhead 56: center guide groove

The present invention is configured as follows to achieve the above object. That is, in the present invention, the first and second cylinders are integrally formed in the master bag and separated up and down about the partition wall in which the center guide groove is formed at the center, and the oil inside the rear end of the first and second cylinders is disposed in parallel. A cylinder body having a hydraulic discharge hole for discharging toward the pressure outlet; A first and second piston cups coupled to a central portion and installed to move forward and backward while applying a compressive force to the return spring in the first and second cylinders of the main body; A piston rod connected to each coupling rod of the first and second piston cups; A connection rod vertically connected to the push rod connected to the brake pedal and coupled to the piston rods at equal intervals in the vertical direction; And a center rod inserted into the center guide groove of the main body partition wall and fastened to the center of the connection rod.

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

2 is a cross-sectional view of the brake master cylinder according to the present invention. As illustrated, the cylinder body 30 is integrally formed at one side of the master bag 20 and is connected to the brake pedal 10. It is adapted to operate according to the operation of the rod 40.

Here, the partition wall 54 is formed in the center of the main body 30, and the center of the partition wall 54 is formed with an annular center guide groove 56 having a predetermined diameter and length.

In addition, the main body 30 is separated into an upper first cylinder 31a and a lower second cylinder 31b by a central partition wall 54, and arranged in parallel with each other, and the cylinders 31a and 31b respectively. The rear end of the hydraulic discharge holes (34a, 34b) for discharging the brake oil filled therein to the pressure outlet (35a, 35b) is formed.

In addition, the first and second piston cups 32a and 32b are installed in the first and second cylinders 31a and 31b so as to be movable forward and backward, and coupling rods 37a and 37b are mounted at the center thereof. The return springs 33a and 33b are provided in the first and second cylinders 31a and 31b to be in close contact with the piston cups 32a and 32b and supported on the inner wall of the main body 30. Of course, brake oil is filled in a space in which the return springs 33a and 33b are embedded, that is, a space surrounded by the piston cups 32a and 32b and the inner wall of the main body 30.

Piston rods 38a and 38b are coupled to the ends of the coupling rods 37a and 37b mounted on the first and second piston cups 32a and 32b to transmit external forces to the respective piston cups 32a and 32b. The upper and lower piston rods 38a and 38b are coupled to each other by a connecting rod 50 perpendicular to the upper and lower piston rods 38a and 38b.

At this time, the fastening portions of the upper and lower piston rods 38a and 38b in the connecting rod 50 are the same in the vertical line, and the distance from the center of the connecting rod 50 is also the same. Therefore, when an external force is transmitted to the connecting rod 50, the same pressure is applied to the upper and lower piston rods 38a and 38b so that the first and second piston cups 32a and 32b can be pushed out simultaneously.

In addition, the center rod 52 is rotatably coupled to the center of the connecting rod 50, a part of which is inserted into the center guide groove 56 formed in the partition wall 54, the front and rear of the connecting rod 50 As the movement moves inside the center guide groove 56 together with the first and second piston cups 32a and 32b, the piston cups 32a and 32b can be smoothly operated.

In addition, the push rod 40 connected to the brake pedal 10 is vertically connected to the center of the connection rod 50 coupled to the center rod 52.

In addition, the coupling rod 50, the center rod 52, and each of the coupling portions to which the piston rods 38a and 38b and the coupling rods 37a and 37b are coupled to each other are fastened by the angle change pin 39. In the case of oil change of one cylinder, the other cylinder can be operated.

In the operation mode of the present invention having such a configuration, when the user applies the pedal force to the brake pedal 10, the external force is applied to the connecting rod 50 by the push rod 40, so that the connecting rod 50 has a predetermined distance. Moving to the right, the same force is simultaneously applied to each of the upper and lower piston rods 38a and 38b connected to the connecting rod 50 to push the first and second piston cups 32a and 32b in the cylinder body 30. To me. At this time, due to the parallel connection of the piston cups 32a and 32b, the force applied to each of the piston cups 32a and 32b is distributed in the same size, so that the stroke of the user's brake pedal 10 for generating a proper braking force is a conventional series. In contrast to the method, it is actually reduced by half.

Thereafter, the first and second piston cups 32a and 32b compress the respective return springs 33a and 33b to generate a certain level of hydraulic pressure in the brake oil filled in the cylinder to discharge hydraulic pressure holes 34a and 34b. By discharging the hydraulic pressure inside the pressure outlet (35a, 35b) through the transfer to the wheel cylinder (not shown) to generate a braking force.

On the other hand, when the user releases the pedaling force to the brake pedal 10, the braking force is dissipated while the first and second piston cups 32a and 32b are simultaneously restored by the respective return springs 33a and 33b in the cylinder body 30. .

By changing the arrangement of the pistons in the brake master cylinder in parallel, the brake pedal stroke is reduced, which improves the user's feeling of pedal operation, and because the dimension change width of the wheel cylinder and the master cylinder is very wide, it is relatively low for braking the vehicle. It is possible to select a brake friction material having a friction coefficient.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

According to the present invention having the above-described configuration, by arranging the piston arrangement in the brake master cylinder in parallel, the brake pedal stroke can be reduced in half, thereby improving the user's feeling of brake pedal operation, and changing the dimensions of the wheel cylinder and the master cylinder. The wider width makes it possible to set a brake friction material having a lower coefficient of friction, and to suppress the body vibration during braking and to significantly reduce the brake noise.

In addition, there is an advantage that the oil change in the master cylinder can be easily performed by mounting the angle change pin.

Claims (2)

delete First and second cylinders 31a and 31b which are integrally formed on the master bag 20 and separated up and down around the partition 54 having the center guide groove 56 formed at the center thereof are disposed in parallel, and the first and second cylinders are arranged in parallel. Cylinder body 30 having hydraulic discharge holes 34a and 34b for discharging the internal oil toward the pressure outlets 35a and 35b at the rear ends of the cylinders 31a and 31b, and coupling rods 37a and 37b at the center. The first and second piston cups 32a, which are fastened and installed to move forward and backward in the first and second cylinders 31a and 31b of the main body 30 and compressing the return springs 33a and 33b. 32b), the piston rods 38a and 38b connected to the respective engagement rods 37a and 37b of the first and second piston cups, and the push rods 40 connected to the brake pedal 10 and are vertically connected to each other. The connecting rod 50 coupled to the piston rods 38a and 38b at equal intervals on the vertical line and inserted into the center guide groove 56 of the partition wall 54 of the main body 30 are connected to each other. In automotive brake master cylinder is configured as a center rod 52 which is fastened to the center of the rod 50, An angle change pin 39 is coupled to each of the coupling rods 50, the center rods 52, and respective coupling portions of the piston rods 38a and 38b and the coupling rods 37a and 37b. Brake master cylinder for automobiles, characterized in that.