KR20030051910A - Booster with return - spring - Google Patents

Abstract

PURPOSE: A booster having a return spring for a vehicle is provided to install an output shaft with the return spring in a static room without a retainer by improving the return spring restoring a valve body and the output shaft. CONSTITUTION: A return spring(80) of a booster includes an elastic support portion(81) and a separation preventing end(82). The elastic support portion is composed of a coil spring. The elastic support portion is combined to a front shell(11) on one end and supported to a valve body(60) on the other end. The separation preventing end is folded on the other end of the elastic support portion to support an end(52) of an output shaft(50). Thereby, the valve body and the output shaft are supported by the elastic support portion of the return spring. An assembling condition of output is maintained by the separation preventing end. Consequently, the output shaft is installed solidly by the return spring without additional components.

Description

Car booster with return spring {Booster with return-spring}

The present invention relates to a vehicle booster, and more particularly, to a vehicle booster having a return spring installed in the constant pressure chamber to restore the valve body and the output shaft when the braking action is released.

The vehicle brake booster (BOOSTER) is a device that generates a large braking force with a small force by using a pressure difference between the vacuum and the atmosphere, and the braking hydraulic pressure is formed through the amplified force because the master cylinder is coupled to the front shell. 1 is a cross-sectional view showing a conventional brake booster (BRAKE BOOSTER) for this function.

As shown in FIG. 1, a conventional brake booster for a vehicle includes a casing 1 in which the front shell 1a and the rear shell 1b are hermetically coupled to each other, and the inside of the casing 1 includes a front seal 2a and 2b. The center plate 1c partitioned into the rear chambers 2c and 2d, one end slidably penetrates the center of the center plate 1c, and the other end penetrates the rear shell 1b to control the air inflow. The valve main body 6, the input shaft 4 which is interlocked by the brake pedal (not shown), and the output shaft 5 which receives the force of displacement according to its operation are provided.

The front chambers 2a and 2b are divided into the front static pressure chamber 2a and the front transformer chamber 2b by the front diaphragm 3a and the front power piston 3b, and the rear chambers 2c and 2d are The rear diaphragm 3c and the rear power piston 3d are divided into the rear static pressure chamber 2c and the rear transformer chamber 2d.

The valve body 6 slides integrally with the diaphragms 3a and 3c and the power pistons 3b and 3d. For this purpose, the valve body 6 has a front diaphragm 3a and front power at one end thereof. The piston 3b, the rear diaphragm 3c, the rear power piston 3d, and the center plate 1c are combined, and the other end of the valve body 6 passes air through the center of the rear shell 1b to communicate with the atmosphere. The suction part 6c is formed. In addition, the valve main body 6 has a constant pressure passage 6a for communicating the constant pressure chambers 2a and 2c and the transformer chambers 2b and 2d, and a transformer passage for communicating the atmosphere with the transformer chamber 2b and 2d. 6b is provided, and a plunger 7 which is engaged with the end of the input shaft 4 and slides in the axial direction is disposed. A reaction disk 5a is provided between the plunger 7 and the tip of the output shaft 5 to double the force applied due to the difference in cross-sectional area and transmit it to the output shaft 5.

The valve body 6 is elastically supported and restored by the return spring 8 disposed in the front hydrostatic chamber 2a. That is, the return spring 8 is formed of a kind of coil spring, one end of which is supported inside the center of the front shell 1a forming the front positive pressure chamber 2a and the other end of which is supported on the center of one end of the valve body 6. It is elastically supported in the restored direction.

On the other hand, reference numeral "6d" is an elastic poppet valve installed in the valve body 6 to control the inflow of air in accordance with the operation of the input shaft (4), the positive pressure passage (6a) by the poppet valve (6d) And the transformer passage 6b are selectively opened and closed. &Quot; 9 " is a retainer provided at the end of the output shaft 5 and the other end of the return spring 8 is seated at the edge thereof, whereby the output shaft 5 is fixedly installed in the front pressure chamber 2a.

As described above, in the conventional booster, a component called a retainer 9 is separately required to prevent the output shaft 5 from being separated from the valve body 6 together with the return spring 8, thereby degrading assembling workability of the booster. And, there is a disadvantage that the overall manufacturing cost increases.

That is, the other end of the output shaft (5) is installed to surround it and the retainer (9) having a seating groove (9a) is formed in the circumferential direction to install the return spring (8) firmly. Therefore, by assembling the retainer 9 at the end of the output shaft 5 first and then installing the return spring 8 therein, the assembling process of the return spring 8 becomes complicated, and the seating groove 9a is formed along the edge. There is a problem that the formed retainer 9 is required to increase the overall manufacturing cost of the vehicle booster.

The present invention is to solve such a problem, an object of the present invention is to improve the return spring is installed in the constant pressure chamber to restore the valve body and the output shaft to provide a return spring that can be installed in the constant pressure chamber in the constant pressure chamber without any additional member It is to provide a car booster equipped.

1 is a cross-sectional view of a conventional vehicle brake booster.

2 is a cross-sectional view of a vehicle brake booster according to the present invention.

3 is an enlarged cross-sectional view of portion A of FIG. 2.

Figure 4 is a perspective view of the return spring according to the present invention.

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

10. Casing 11. Front shell

40. Input shaft 50. Output shaft

60. Valve body 80. Return spring

81 .. Elastic support 82.

The present invention for achieving this object is;

The front shell and the rear shell are hermetically coupled and the casing with the power piston and diaphragm is divided into the positive pressure chamber and the transformer chamber, and one end is connected to the center of the power piston and the diaphragm, and the other end passes through the rear shell. The valve body is connected to the valve body, one end is coupled to the valve body, and the brake pedal and the other end are connected to each other, and as the input shaft moves forward, the end portion receives the reaction piston and the diaphragm displacement to receive the force of the valve body. In a brake booster for a vehicle having an output shaft disposed in the constant pressure chamber to contact one end, and a return spring disposed in the constant pressure chamber to elastically support the output shaft and the valve body,

One end of the return spring is coupled to the front shell, and the other end includes an elastic support portion formed of a coil spring so as to be supported by the valve body, and a separation prevention end bent inward from the other end of the elastic support portion to support the output shaft end. .

According to this structure, the return spring elastically supports the valve body and the output shaft and prevents the output shaft from being separated from the valve body, thereby improving assembly workability and reducing the overall manufacturing cost.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Briefly, the accompanying drawings, Figure 2 is a cross-sectional view showing the overall structure of the booster for vehicles according to the present invention, Figures 3 and 4 is an extract showing the installation structure and shape of the return spring according to the present invention.

As shown in FIG. 2, the vehicle booster according to the present invention includes a casing 10 in which the front shell 11 and the rear shell 12 are hermetically coupled to each other, and the inside of the casing 10 includes a front chamber 21 and a 22. ) And the center plate 13 partitioned into the rear chambers 23 and 24, and the center plate 13 penetrates so that the center part of the center plate 13 can slide freely, and the front chamber 21, 22 and the rear chamber ( 23) The valve main body 60 for controlling the inflow of air to the 24 and the input shaft 40 for operating the valve body 60 by the operation of the brake pedal (not shown) and the elasticity at the front end to receive the doubled force It includes an output shaft 50 provided with a reaction disk 51 made of material.

The front chambers 21 and 22 are formed in the space between the front shell 11 and the center plate 13, which are again formed by the front diaphragm 31 and the front power piston 32. ) And front transformer chamber (22). In addition, the rear chambers 23 and 24 are formed in the space between the center plate 13 and the rear shell 12, which are also formed by the rear diaphragm 33 and the rear power piston 34. 23) and the rear transformer chamber (24). Reference numeral 14 is a vacuum connection pipe installed on the outer wall of the front shell 11 to communicate the front pressure chamber 21 and the negative pressure source (not shown).

The valve body 60 is provided in a multistage stepped cylindrical shape, and once the front diaphragm 31, the front power piston 32 and the center plate 13, the rear diaphragm 33 and the rear power piston ( 34) The center portion is fitted and coupled, and the other end of the air suction portion 63 passes through the center portion of the rear shell 12 to communicate with the outside air.

In addition, the valve main body 60 has a positive pressure passage 61 for communicating the constant pressure chambers 21, 23 and the transformer chambers 22, 24, and a transformer for communicating the transformer chambers 22, 24 with the outside air. A cylinder 66 is formed in the passage 62 and one end in the axial direction. The cylinder 66 is provided with a plunger 70 sliding in the axial direction in association with the end of the input shaft 40, and the inlet of the valve body 60 substantially controls the inflow of air by the operation of the input shaft 40. The poppet valve 64 of elastic material is installed. In order to perform the vacuum valve function in combination with the poppet valve 64, a first valve seat portion 65 is provided on the inner circumference of the valve body 60, so that the tip of the poppet valve 64 has a first valve seat portion 65. When seated in the static pressure passage 61 is closed. In addition, a second valve seat portion 71 is provided at the rear end of the plunger 70 so as to perform an air valve function in combination with the poppet valve 64, so that the tip of the poppet valve 64 has the second valve seat portion 71. When seated in the outside air is blocked to flow into the transformer chamber (22, 24).

On the other hand, the valve body 60 is elastically supported through the return spring 80 disposed in the front static pressure chamber 21 to restore the output shaft 50, the valve body 60 and the plunger 70, etc. when the braking action is released. The detailed structure thereof will be described with reference to FIGS. 3 and 4 as follows.

First, the output shaft 50 is arranged to contact the valve body 60 to receive the force of displacement of the power pistons 32, 34 and the diaphragm 31, 33 as the input shaft 40 advances during the braking operation. do. That is, one end of the output shaft 50 is in contact with the center of one end of the valve body 60 via the reaction disk 51, the other end thereof is directly connected to the master cylinder assembly (not shown) through the center of the front shell (11). . In addition, an end portion of the output shaft 50 is provided with a coupling portion 52 having a diameter extending therein and a reaction disc 51 made of elastic material seated therein.

And the return spring 80 is made of a coil spring and disposed in the axial direction in the front pressure chamber 21 so that the output shaft 50 passes through the inside to restore the output shaft 50, the valve body 60, and the like. An elastic support 81 for directly elastically supporting the valve body 60 and a separation preventing end 82 for preventing the separation of the output shaft 50 are defined.

One end 81a of the elastic support 81 is coupled to the center of the front shell 11, and the other end 81b of the elastic support 81 is formed at a locking jaw 60a formed in the circumferential direction on the center of the front end surface of the valve body 60. By being seated and supported, the valve body 60 is elastically supported in a direction opposite to the forward direction of the input shaft 40.

In addition, the separation prevention end 82 is bent inward from the other end (81b) of the elastic support portion 81 is made to support the end of the output shaft (50). That is, the bent release preventing end 82 supports the coupling portion 52 of the output shaft 50 to prevent the separation thereof. Accordingly, the output shaft 50 is firmly installed by the separation preventing end 82 integrally provided in the return spring 80 without any additional parts such as the conventional retainer, thereby making it easier to assemble.

Next, the operation and effects of the vehicle brake booster according to the present invention will be described.

First, in a vehicle equipped with a vehicle brake booster according to the present invention, when the driver steps on the brake pedal and the input shaft 40 moves forward, the plunger 70 is pushed toward the reaction disc 51, thereby the second valve seat portion 71. And the poppet valve 64 are spaced apart so that communication between the constant pressure chambers 21 and 23 and the transformer chambers 22 and 24 is blocked.

Accordingly, the outside air flows into the transformer chambers 22 and 24 in the vacuum state through the air suction unit 63 and the transformer passage 62, and the front diaphragm 31 and the front power which are operated by the pressure difference. The piston 32 and the rear diaphragm 33 and the rear power piston 34 are pushed together with the valve body 60 to the output shaft 50 side, whereby the output is transmitted through the reaction disc 51 and the output shaft 50 to the master cylinder. It is delivered to an assembly (not shown) to generate a braking pressure.

In this braking operation, the elastic support 81 of the return spring 80 is elastically supporting the valve body 60 while being compressed.

When the driver releases the brake pedal, the plunger 70 and the input shaft 40 are restored by the elastic restoring force of the return spring 80 and the elastic support 81. At the same time, the poppet valve 64 has a second valve seat. It is pushed by the 71 to be separated from the first valve seat portion 65, and serves as an air valve to prevent the inflow of air. In addition, as the poppet valve 64 is separated from the first valve seat portion 65, the positive pressure passage 61 communicates with the poppet valve 64. Accordingly, the air in the front transformer chamber 22 and the rear transformer chamber 24 exits to the front positive pressure chamber 21 in a vacuum state, and then continues to the outside through the vacuum connection pipe 14 connected to the negative pressure source. The brake booster will be in the initial state.

At this time, since the engaging portion 52 of the output shaft 50 is always supported by the escape prevention end 82 of the return spring 80, the output shaft 50 is the valve body 60 when the booster is operated. Deviation from) is prevented.

As described in detail above, according to the booster for a vehicle having a return spring according to the present invention, the return spring is one end coupled to the front shell and the other end is an elastic support made of a coil spring and the other end of the elastic support, And an escape preventing end bent inwardly in order to support the output shaft end, the valve body and the output shaft are elastically supported by the elastic support of the return spring, and the output shaft is assembled through the escape preventing end of the return spring as it is. maintain. Accordingly, the output shaft is firmly installed through the return spring without the need for a separate component such as a conventional retainer, thereby improving the assembly workability and reducing the manufacturing cost.

Claims (1)

The front shell and the rear shell are hermetically coupled to each other, and a casing provided with a power piston and a diaphragm dividing the interior into a positive pressure chamber and a transformer chamber, and one end is coupled to the center of the power piston and the diaphragm, and the other end passes through the rear shell. A valve body in communication with the atmosphere, an input shaft having one end coupled to the valve body and having a brake pedal and the other end connected thereto, and an end portion of the reaction disk for receiving the force of the power piston and diaphragm displacement as the input shaft is advanced. A vehicle brake booster having an output shaft disposed in the constant pressure chamber to be in contact with one end of the valve body and a return spring disposed in the constant pressure chamber to elastically support the output shaft and the valve body. The return spring 80 One end (81a) is coupled to the front shell 11 and the other end (81b) is an elastic support portion 81 made of a coil spring to be supported by the valve body 60, Booster for a vehicle having a return spring, characterized in that it is bent inwardly from the other end (81b) of the elastic support portion 81 to support the end of the output shaft (50) end 52.