KR100776128B1 - Master cylinder provided with a guide for assemblying facility - Google Patents

Abstract

The present invention relates to a master cylinder equipped with a funnel-shaped guide for guiding the output rod of the booster at the end of the piston of the master cylinder.

The master cylinder having the assembly guide of the present invention includes a front housing 3 forming a front chamber 15, a rear housing 5 coupled to the front housing 3, and a rear pedal connected to the brake pedal. A brake booster 1 composed of a power piston 7 coaxially coupled to 5); Master cylinder 51 composed of a master cylinder body 53 having a piston 57 installed therein to reciprocate therein, and a braking oil storage chamber 55 mounted above the body 53 to store braking oil. In the coupling structure of (), a funnel-shaped guide 61 for guiding the output rod 13 extending from the power piston part 7 is mounted on the outer circumferential surface of the master cylinder 51 side end of the piston 57. It is characterized by that.

Therefore, according to the present invention, when assembling the master cylinder and the booster, the guide guides the output rod of the booster inserted into the piston of the master cylinder, thereby facilitating the assembling work and preventing the inserted part from being damaged due to the collision. Will be.

Master cylinder, booster, assembly, guide

Description

Master cylinder provided with a guide for assemblying facility}

1 is a partially cut-away longitudinal sectional view showing a conventional brake booster and a master cylinder assembled state.

Figure 2 is a partial cutaway longitudinal sectional view showing a brake booster and a master cylinder assembly state according to the present invention.

Figure 3 is a view showing a guide of the master cylinder according to the present invention shown in Figure 2, Figure 3a is a plan view. 3B is a longitudinal sectional view.

4 is a partially enlarged longitudinal sectional view showing a fitting groove machined in the primary piston of the master cylinder according to the present invention shown in FIG.

Brief description of symbols for the main parts of the drawings

1: brake booster 3: front housing

5 rear housing 7 power piston

13: output rod 15: front chamber

51: master cylinder 53: master cylinder body

55: braking oil storage chamber 57: primary piston

61: guide 65: finger portion                 

67: stopper 69: fitting groove

The present invention relates to a master cylinder of an automobile brake system, and more particularly, to a power brake of an automobile brake system having a guide for guiding the output rod at the end of a master cylinder piston into which an output rod of a booster is fitted. It relates to a master cylinder having a guide for assembling.

Early cars were very slow and the car was light. In other words, the need for a brake was not urgent. However, with the rapid development of automobile technology, the speed of vehicles has gradually increased, and the weight of vehicles has gradually increased due to the increase of internal and external parts. Thus, not only mass and acceleration, which are major factors of vehicle inertia, have been increased by synergistic effects, but also interest in safety while driving has increased. As a result, various researches and developments have been made to improve the braking performance of the vehicle. As a result of these efforts, it is the brake booster that is rapidly developing recently.

The brake booster is a device that boosts the driver's pedaling force when braking the vehicle. The brake booster may be classified into a vacuum booster and a hydraulic booster.

The dual vacuum booster 101 is configured to obtain power by using a negative pressure of the intake manifold, that is, a vacuum, and as shown in FIG. 1, the front housing 103, the rear housing 105, and the power forming the outer body. It consists of a piston portion 107, the front housing 103 and the rear housing 105 is divided into a front chamber, that is, a vacuum chamber and a rear chamber, that is, an atmospheric pressure chamber by the internal diaphragm.

The power piston unit 107 is a power piston 109 interlocking with the diaphragm, a push rod 111 for transmitting a pedal force applied to the pedal, and a master cylinder 151 by doubling the pedal force transmitted through the push rod 111. And an output rod 113 to be delivered to.

In addition, the master cylinder 151 is a part for generating braking hydraulic pressure by the pedaling force of the pedal powered by the booster 101. The main body 153 coupled to the booster 101 and the braking oil chamber 155 for storing the braking oil are stored therein. In the case of a single master cylinder (not running), the output rod 113 of the booster 101 in the inner piston, in the case of the tandem master cylinder 151 shown in Figure 1 in the primary piston 157 Is to be fitted.

However, in the related art, as shown in FIG. 1, when the brake booster 101 and the master cylinder 151 are coupled to each other by hand, the operator of the booster 101 is connected to the primary piston 157 of the master cylinder 151. In inserting the output rod 113, careful attention must be paid to maintaining alignment between the primary piston 157 and the output rod 113.

Therefore, the assembling work of the booster 101 and the master cylinder 151 becomes difficult, the working time becomes long, and when the output rod 113 is inserted into the primary piston 157 in a misaligned state from the output rod 113. Due to the impact applied to the inlet portion of the primary piston 157 had a problem that can be damaged.

The present invention is proposed in order to prevent problems that may occur during assembly of the conventional master cylinder and the booster coupling structure, the output rod of the brake booster in the assembly of the master cylinder and the brake booster 1 The purpose is to facilitate the assembly of the master cylinder and the booster by easily guided into the car piston and to improve the quality of the assembled product by preventing the primary piston from being damaged by the output rod during the assembly work. .

In order to achieve the above object, the present invention includes a brake booster composed of a front housing forming a front chamber, a rear housing coupled to the front housing, and a power piston portion coaxially coupled to the rear housing to be connected to the brake pedal; In the coupling structure of the master cylinder which consists of the master cylinder main body which a piston is provided to reciprocate inside, and the braking oil storage chamber mounted above the main body to store braking oil, the power is connected to the outer peripheral surface of the distal end of the piston side of a piston. Provided is a master cylinder having a guide for assembly to which a funnel-shaped guide for guiding an output rod extending from a piston part is provided.

Hereinafter, a master cylinder having an assembly guide according to the present invention will be described in detail with reference to the drawings.

The master cylinder according to the present invention is a device constituting a vehicle braking system together with the brake booster 1 as shown in FIG. 2 in FIG. 2, and is adapted to the stepping force transmitted through the output rod 13 of the booster 1. The master cylinder main body 53 for transmitting the hydraulic pressure generated therein to the front and rear wheels through the hydraulic line, and the braking oil storage chamber 55 for supplying the braking oil for generating braking hydraulic pressure by the stepping force in the main body 53. And a piston (57) for forming a braking hydraulic pressure by repeating the reciprocating motion from side to side by the output rod (13) and the reaction spring, as shown in FIG. Likewise, when the type of the master cylinder is tandem, two primary pistons 57 and two secondary pistons are installed in the main body 53, and the dual primary pistons 57 are installed to be inserted into the booster.

In addition, the brake booster 1, which is installed between the master cylinder 51 and the brake pedal (not shown) to double the pedaling force of the brake pedal, also has a large front housing (as shown in FIG. 2). 3), the rear housing 5 and the power piston part 7 are comprised. Here, the front housing (3) forms a front chamber (15) therein to take the vacuum pressure transmitted from the intake manifold, and forms the body of the booster together with the rear housing (5) coupled to the rear. The rear housing 5 is coupled to the rear of the front housing 3 with the diaphragm interposed therebetween to form a rear chamber in which atmospheric pressure is applied. The central portion of the rear housing 5 is coaxially coupled with the power piston portion 7 so that the pedal force acting on the pedal can be increased by using the vacuum pressure and the atmospheric pressure applied to the inside of the front housing 3 and the rear housing 5. It is supposed to be.

However, in the master cylinder 51 according to the present invention, a funnel-shaped guide 61 is mounted on the outer circumferential surface of the distal end of the master cylinder 51 side of the primary piston 57, so that the master cylinder 51 and the booster 1 are provided. The assembly serves to guide the output rod 13 extending from the power piston portion 7 to be inserted into the primary piston 57 even when the primary piston 57 and the output rod 13 are not accurately aligned. .

At this time, the guide 61 mounted on the primary piston 57 has a funnel shape as a whole, and may be attached to the outer circumferential surface of the piston 57, but when the guide 61 is attached to and fixed to the outer circumferential surface of the piston 57, When the output rod 13 is inserted, it may act as a deterioration factor such as causing friction with the guide 61. Preferably, the guide 61 has an outer circumferential surface of the piston 57 as shown in FIGS. 3A, 3B and 4. Assemble rotatably to the distal end.

To this end, the guide 61 has a plurality of fingers 65 protruding at regular intervals on the inner surface of the distal end of the neck 63, these fingers 65 in the outer peripheral surface end portion of the piston 57 in a snap type The fitting groove 69 to be engaged is machined in the circumferential direction. An annular stopper 67 protrudes in the circumferential direction to prevent the guide 61 from being pushed into the piston 56 while the guide 61 is coupled to the piston 56. have.

Accordingly, according to the master cylinder 51 having the guide 61 configured as described above, when the booster 1 and the master cylinder 51 are coupled, the output rod 13 of the booster 1 is not visually confirmed. Is inserted into the primary piston 57 of the master cylinder 51, the output rod 13 is guided toward the center once in contact with the guide 61 is naturally inserted into the piston 57, so the primary piston ( It is not necessary to take care or time to align the output rod 13 on the center axis of 57, and there is no fear that the piston 57 or the output rod 13 will collide with each other due to misalignment.

According to the master cylinder with a guide for assembling according to the present invention as described above, the output rod of the booster without paying special attention when combining the master cylinder and the booster by rotatably mounting the guide formed in the shape of a funnel on the piston outer peripheral surface of the master cylinder Is guided by the guide and easily inserted into the piston of the master cylinder, so assembling work of the master cylinder and the booster can be made very easy. Therefore, the quality of the product can be improved by preventing the damage caused by the collision between the piston and the output rod. You can do it.

Claims (2)

A front piston 3 forming the front chamber 15, a rear housing 5 coupled to the front housing 3, and a power piston part coaxially coupled to the rear housing 5 so as to be connected to the brake pedal. A brake booster 1 composed of 7); Master cylinder 51 composed of a master cylinder body 53 having a piston 57 installed therein to reciprocate therein, and a braking oil storage chamber 55 mounted above the body 53 to store braking oil. In the coupling structure of An assembling, characterized in that a funnel-shaped guide 61 for guiding the output rod 13 extending from the power piston portion 7 is mounted on the outer circumferential surface of the master cylinder 51 side end portion of the piston 57. Master cylinder with guide for use. According to claim 1, The guide 61 has a plurality of fingers 65 protruding at a predetermined interval on the inner surface of the neck 63, the stopper 67 is formed in the circumferential direction on the inlet side of the inner surface of the neck 63, The master cylinder with a guide for assembly, characterized in that the fitting groove (69) to which the finger portion (65) is coupled to the outer peripheral surface end portion of the piston (57) is machined in the circumferential direction.

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