KR101675570B1 - power cylinder of break booster - Google Patents

power cylinder of break booster Download PDF

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Publication number
KR101675570B1
KR101675570B1 KR1020150117837A KR20150117837A KR101675570B1 KR 101675570 B1 KR101675570 B1 KR 101675570B1 KR 1020150117837 A KR1020150117837 A KR 1020150117837A KR 20150117837 A KR20150117837 A KR 20150117837A KR 101675570 B1 KR101675570 B1 KR 101675570B1
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KR
South Korea
Prior art keywords
power piston
support
push rod
control valve
circumferential surface
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KR1020150117837A
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Korean (ko)
Inventor
문부근
조주형
이동현
Original Assignee
이래오토모티브시스템 주식회사
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Priority to KR1020150117837A priority Critical patent/KR101675570B1/en
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Publication of KR101675570B1 publication Critical patent/KR101675570B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/236—Piston sealing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/569—Vacuum systems indirect, i.e. vacuum booster units characterised by piston details, e.g. construction, mounting of diaphragm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/57—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of control valves

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

A power cylinder of a brake booster according to an embodiment of the present invention includes a push rod that is moved forward or backward in operation of a brake pedal, an air valve that is coupled to the front of the push rod and moves forward or backward together with the push rod, A power piston which is formed in a tubular shape and in which the push rod is inserted in an inner side, a power piston which is disposed on the inner side of the power piston so as to be slidable along the inner circumferential surface of the power piston, A support member which extends in a corrugated shape toward the other side penetrating to the inside and forms a support groove on the front side and the rear side respectively; a support member coupled to the outer circumferential surface of the support member to divide the space between the power piston and the control valve into a plurality of spaces And the inner circumferential surface of the power piston A control valve that moves forward or backward in accordance with the movement of the push rod to selectively open and close a space between the control valve and the power piston in contact with an inner surface of the power piston, And a rod spring which is seated in a support groove formed at the rear of the support member and resiliently supports the push rod.

Description

The power cylinder of break booster

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power cylinder of a brake booster which generates a pressure difference between a vacuum and an atmospheric pressure in a brake booster provided in a vehicle.

Generally, a brake booster is used in a vehicle to increase the operating pressure of the brake.

The brake booster comprises a housing defining a pressure chamber therein, a diaphragm disposed in the housing for partitioning the pressure chamber, a power cylinder installed through the diaphragm, and operating the master cylinder.

The power cylinder includes a power piston, a support member slidably disposed on the inner surface of the power piston, a valve member disposed inside the support member to open and close a flow path of the power piston, And an O-ring disposed to seal the space between the support member and the power piston.

That is, in order to seal the power piston and the supporting member, a separate part capable of realizing a sealing function such as an O-ring was conventionally required.

Therefore, as the number of parts increases, the weight of the product and the assembly cycle time increase, and the cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to solve the problems of the prior art by eliminating the conventional O-ring which performs the sealing function in the power piston, improving the structure of the support member and the control valve, Which is capable of simultaneously performing a role of a valve and an O-ring in a brake booster.

According to an aspect of the present invention, there is provided a power cylinder of a brake booster, the brake pedal including a push rod that is moved forward or backward when the brake pedal is operated, A power piston which is formed in a hollow tube shape and in which the push rod is inserted and installed, an air valve which is disposed on the inner side of the power piston so as to be slidable along the inner circumferential surface of the power piston, A support member extending in a corrugated shape toward the other side through which the push rod penetrates inward from the one side in contact with the power piston and the control valve, The space between the first and second spaces is divided into a plurality of spaces, A control valve which is moved forward or rearward in accordance with the movement of the push rod in a state of being closely attached to the inner circumferential surface of the power piston and selectively opens and closes a space between the control valve and the power piston in contact with the inner surface of the power piston, A valve spring that is seated in a support groove formed in the front of the support member to elastically support the head portion and a load spring that is seated in a support groove formed at the back of the support member and elastically supports the push rod.

The inside of the power piston is formed to be stepped in the axial direction so that the width of the front side inner diameter where the air valve is disposed is relatively small, and a projection in contact with the control valve may protrude axially at the stepped portion.

Wherein the support member includes a support support portion that slides in contact with the inner circumferential surface of the power piston, and a support groove extending from the support support portion in a corrugated shape in the width direction of the power piston to forward and rearward, And a support seating part for supporting the spring.

The support support portion has a cross-

Figure 112015081190324-pat00001
A sliding portion formed to be slidable in contact with the inner circumferential surface of the power piston, and a locking portion extending vertically from the sliding portion and contacting a locking protrusion formed on an inner circumferential surface of the power piston.

Wherein the support seating portion extends from the end of the engagement portion toward the push rod side,

Figure 112015081190324-pat00002
And the other side is in contact with the other side of the control valve extending in the axial direction from one side of the control valve and the other side is in contact with the peripheral side of the control valve, A fixing groove corresponding to one side of the control valve and a fixing protrusion protruding outside and supporting one side of the control valve may be formed.

The fixing protrusion may be formed in an annular shape protruding in the radial direction from the outer circumferential surface of the support seating part and then bent toward one side of the control valve and hooked to one side of the control valve.

The control valve moves forward or backward in the power piston according to the movement of the push rod, selectively contacts the inner surface of the power piston, and has a rib which is closely attached to the outer circumferential surface of the support seating portion along the circumference of the inner circumference A sealing portion which extends axially from the head portion and cooperates with the rib to contact the outer circumferential surface of the support seating portion to seal a space between the control valve and the support seating portion in which the valve spring is disposed, And a bellows portion extending from the outer peripheral surface of the portion to the sealing portion side and connecting the head portion and the sealing portion to each other.

The sealing portion may include a seating portion which is seated in the fixing groove and is brought into close contact with the support member, and a close contact portion which extends radially from the seating portion and closely contacts the inner circumferential surface of the power piston.

And a spring retainer disposed between the rod spring and the push rod and supported by the rod spring to transmit the elastic force of the rod spring to the push rod.

A plurality of stepped portions having different outer diameters may be formed on the outer peripheral surface of the spring retainer.

According to the present invention, by integrally forming the head portion and the sealing portion on the control valve, the valve serves as a valve for opening and closing the vacuum chamber, and can serve as an O-ring which is in close contact with the inner peripheral surface of the power piston, Furthermore, the control valve replaces the function of the o-ring, which reduces the cost and weight of the part as well as the working time.

In addition, by sealing the auxiliary chamber through the head portion and the sealing portion, it is possible to prevent the valve spring disposed inside from being protected from external force (pressure), to prevent the reduction of the elastic force, and to further increase the return force of the push rod.

Also, '

Figure 112015081190324-pat00003
(Pressure) transmitted to the head portion is dispersed in the power piston by supporting the head portion in the width direction and the axial direction of the power piston through the valve seat that is seated on the support seating portion and the support seating portion formed in the & The control valve can be stably supported to prevent the escape.

1 is a cross-sectional view schematically showing a cross section of a brake booster equipped with a power cylinder of a brake booster according to an embodiment of the present invention.
Fig. 2 is an enlarged view of the portion "A" in Fig.
Fig. 3 is an enlarged view of the portion "B" in Fig. 2.

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

FIG. 1 is a cross-sectional view schematically showing a cross section of a brake booster equipped with a power cylinder of a brake booster according to an embodiment of the present invention. FIG. 2 is an enlarged view of the "A" Fig. 2 is an enlarged view of an enlarged portion "B" in Fig.

First, a power cylinder 100 (hereinafter referred to as a power cylinder 100) of a brake booster according to an embodiment of the present invention is applied to a brake booster 200 of an automobile, A front housing 210 and a rear housing 220 which are attached to each other to form a pressure space therein, and a rear housing 220 which is disposed between the front housing 210 and the rear housing 220, 211, and a rear space 221. The diaphragm 230 includes a diaphragm 230,

The brake booster 200 is installed to penetrate the rear housing 220 and the diaphragm 230 so that the brake booster 200 can be operated in response to the operation of the brake pedal (not shown) A cylinder 100 and boots 260 formed in the form of a corrugated tube and disposed around the present power cylinder 100.

The actions and effects of the front housing 210, the rear housing 220, the diaphragm 230, and the boots 260 can be the same as those of the conventional brake booster, and a detailed description thereof will be omitted.

Hereinafter, the power cylinder 100 will be described in detail.

1 and 2, the power cylinder 100 is installed through the rear housing 220 and the diaphragm 230 and is elastically deformed by a return spring 254 supported on the inner wall of the front housing 210. [ The pushrod 110 includes a pushrod 110 that is supported to move forward and backward as the brake pedal is operated and released to increase the operating pressure of the brake pedal.

The push rod 110 is connected to the brake pedal operated by the driver by a link mechanism (not shown) so as to move forward or backward when the brake pedal is operated. The air valve 120 to be described later is coupled to the front end, A seating jaw 111 protruding in a radial direction and bearing a spring retainer 115 to be described later may be formed.

Next, the power cylinder 100 includes an air valve 120.

The air valve 120 is coupled to the front of the push rod 110 and can be moved forward or backward together with the push rod 110 during operation of the brake pedal.

More specifically, the air valve 120 includes a disc-shaped valve portion 121 protruding radially from the outer circumferential surface, a pressing portion 125 protruding forwardly from the valve portion 121 to press the disc 251, A rod engaging portion 123 formed to protrude rearward of the valve portion 121 and coupled to the push rod 110 inwardly and a protrusion formed on the rear surface of the valve portion 121 so as to be in contact with a control valve 140 And may include a pressing protrusion 122.

In addition, the power cylinder 100 includes a power piston 130.

As shown in FIG. 2, the power piston 130 is installed in a hollow tube shape with the push rod 110 inserted therein. The inside of the power piston 130 is formed such that the width of the front side inner diameter where the air valve 120 is disposed is relatively small And protrusions 132, which are in contact with the control valve 140, may protrude axially from the stepped portions.

Next, the power cylinder 100 includes a support member 150 and a control valve 140.

The support member 150 is disposed inside the power piston 130 so as to be slidable along the inner circumferential surface of the power piston 130 so that the push rod 110 penetrates from the one side contacting the inner circumferential surface of the power piston 130 to the inside To form a support groove 153a on the front side and the rear side, respectively.

2 and 3, the support member 150 includes a support support portion 151 that slides in contact with the inner circumferential surface of the power piston 130, and a corrugated shape in the width direction of the power piston 130 from the support support portion 151 And a support seating 153 for supporting a valve spring 147 and a rod spring 117 to be described later by forming support grooves 153a at the front and rear sides, respectively.

The support supporter 151 has a cross-

Figure 112015081190324-pat00004
A sliding portion 1511 formed to be slidable in contact with the inner circumferential surface of the power piston 130 and a stop portion 1511 extending vertically from the sliding portion 1511 and contacting the engaging protrusion 139 formed on the inner circumferential surface of the power piston 130 1513 < / RTI >

The support seating part 153 extends from the end of the engagement part 1513 toward the push rod 110 side,

Figure 112015081190324-pat00005
And a valve spring 147 and a rod spring 117 are seated on the front and rear sides of the push rod 110 so that the axial direction of the valve spring 147 and the rod spring 117, And a support groove 153a for supporting the width direction at the same time. One side of the support seating part 153 disposed adjacent to the end of the locking part 1513 is connected to one side of the control valve 140 which is in close contact with the inner circumferential surface of the power piston 130, And the other side of the support seating portion 153 extending from one side of the support seating portion 153 is in the axial direction from one side (sealing portion 145) of the control valve 140 The other side of the extended control valve 140, that is, the head portion 141 of the control valve 140 to be described later. At this time, a fixing groove 153b corresponding to the sealing portion 145 of the control valve 140 and a fixing protrusion 153c protruding outward and supporting the sealing portion 145 are formed around the outer circumferential surface of the support seating portion 153, Can be formed.

That is, even when the pressure is transmitted to the head part 141 due to the pressure difference in the power piston 130, the support seating part 153 can not transmit the force (pressure) transmitted to the head part 141 to the power piston 130 By dispersion, the control valve 140 can be stably supported. The space in which the valve spring 147 is disposed in close contact with the head portion 141 and the sealing portion 145 of the control valve 140 is sealed in the auxiliary chamber 133a It is possible to prevent the deterioration of the elastic force by protecting the disposed valve spring 147 from an external force (pressure), and to further increase the return force of the push rod 110. [

Illustratively, a valve spring 147 is seated in a support groove 153a formed at a position adjacent to the push rod 110 along the width direction of the power piston 130, and is relatively far from the push rod 110 The rod spring 117 can be seated in the support groove 153a formed in the guide groove 153a. The fixing protrusion 153c is vertically protruded in the radial direction from the outer circumferential surface of the support seating portion 153 so that the fixing protrusion 153c is caught by the sealing portion 145 to completely fix the sealing portion 145 to the support groove 153b, And may be formed in an annular shape that is bent toward the sealing portion 145 and hooked to the sealing portion 145. Illustratively, the fixing protrusion 153c may be formed in the shape of a circle.

The control valve 140 is coupled to the outer circumferential surface of the support member 150 to divide the space between the power piston 130 and the control valve 140 into a plurality of spaces, And moves forward or backward in accordance with the movement of the push rod 110 to selectively open and close the space between the control valve 140 and the power piston 130 in contact with the inner surface of the power piston 130.

Here, the plurality of spaces is a space between the control valve 140 and the power piston 130, which is a space between the control valve 140 and the support member 150 in which the valve spring 147 is disposed, And can be partitioned into a vacuum chamber 133.

That is, the control valve 140 is disposed between the power piston 130 and the support member 150 to separate the space between the power piston 130 and the support member 150 into the auxiliary chamber 133a and the vacuum chamber 133 And the vacuum chamber 133 can be opened or closed by being selectively in contact with the projection 132 formed at the stepped portion of the power piston 130 in accordance with the movement of the push rod 110. [

More specifically, the control valve 140 may include a head portion 141. [

The head portion 141 moves forward or backward in the power piston 130 according to the movement of the push rod 110 and selectively contacts the protrusion 132 to thereby open and close the vacuum chamber 133 have. A rib 141a is formed on the inner circumferential surface of the head portion 141 so as to be in close contact with the outer circumferential surface of the support seating portion 153. [

In addition, the control valve 140 may include a sealing portion 145.

The sealing part 145 extends in the axial direction from the head part 141 and is in contact with the outer peripheral surface of the support seating part 153 with the rib 141a formed in the head part 141, The chamber 133a can be sealed.

The sealing part 145 includes a seating part 145a which is seated in the fixing groove 153b formed around the outer peripheral surface of the support member 150, that is, the support seating part 153 and is in close contact with the supporting member 150, And a tight fitting portion 145b extending from the fitting portion 145a in the radial direction and coming into close contact with the inner circumferential surface of the power piston 130. [

In addition, the control valve 140 may include a bellows portion 143.

The bellows portion 143 is disposed between the head portion 141 and the sealing portion 145 to connect the head portion 141 and the sealing portion 145 to each other. The bellows portion 143 is formed in a corrugated shape, When moving backward, it is possible to flexibly support the movement of the head portion 141 by folding or unfolding. The bellows portion 143 may extend from the outer circumferential surface of the head portion 141 toward the sealing portion 145 so that the auxiliary chamber 133a may be formed between the head portion 141 and the sealing portion 145. [ have.

That is, the control valve 140 is completely in close contact with the outer circumferential surface of the support member 150 through the head portion 141 and the sealing portion 145 to close the auxiliary chamber 133a, so that the valve spring 147, Can be protected from an external force (pressure).

The control valve 140 serves as a valve for opening and closing the vacuum chamber 133 through the head portion 141 and also functions as a valve for opening and closing the support member 150 and the power piston 130 through the sealing portion 145. [ It can perform the role of an O-ring which is in close contact with the inner circumferential surface.

On the other hand, the power cylinder 100 includes a valve spring 147 and a rod spring 117.

The valve spring 147 is disposed in front of the support member 150 to elastically support the head portion 141 to closely contact the head portion 141 to the projection 132. [

That is, the valve spring 147 is seated in the support groove 153a formed in front of the support member 150, and can elastically support the head portion 141. [

On the other hand, the rod spring 117 is disposed behind the support member 150, and can elastically support the push rod 110.

That is, the rod spring 117 is seated in the support groove 153a formed on the rear side of the support member 150, and can elastically support the push rod 110. [

Meanwhile, the power cylinder 100 may further include a spring retainer 115 disposed between the rod spring 117 and the push rod 110.

The spring retainer 115 is disposed between the rod spring 117 and the push rod 110 and is supported by the rod spring 117 to indirectly transmit the elastic force of the rod spring 117 to the push rod 110.

In addition, the spring retainer 115 can form a plurality of stepped portions 115a having different diameters on the outer circumferential surface so as to support the rod spring 117 whose diameter gradually becomes smaller or larger toward one side .

Hereinafter, the operation and effects of the respective components of the power cylinder 100 will be described with reference to Figs. 1 and 2. Fig.

For the sake of explanation, it is assumed that the reference numerals used in describing the power cylinder 100 are used for the sake of simplicity, and redundant explanations Is omitted.

The air valve 120 and the diaphragm 230 are moved forward and the air is introduced into the space between the rear housing 220 and the diaphragm 230. When the brake pedal is operated, the push rod 110 is moved forward, do. The head portion 141 is brought into close contact with the protrusion 132 by the push rod 110 moved forward so as to block the negative pressure in the front space 211 from acting as the rear space 221, A pressure difference is generated in the front space 211 and the rear space 221 defined by the diaphragm 230 and the diaphragm 230 is moved forward to increase the operating pressure of the brake pedal .

On the other hand, when the operation of the brake pedal is released, the compressed load spring 117 is restored to its original state by the resilient force so as to push the push rod 110 backward, and at the same time, The air valve 120 is moved backward and the head portion 141 is separated from the projection 132 to apply a negative pressure to the rear space 221. [

As described above, according to the present invention, since the head portion 141 and the sealing portion 145 are formed integrally with the control valve 140, the support member 150 functions as a valve for opening and closing the vacuum chamber 133, And the inner surface of the power piston 130. Further, since the control valve 140 replaces the function of the O-ring, the cost and the weight of the product can be reduced by reducing the number of parts, Can be shortened.

Further, by sealing the auxiliary chamber 133a through the head portion 141 and the sealing portion 145, the valve spring 147 disposed inside is protected from an external force (pressure) to prevent a reduction in the elastic force, The returning force of the push rod 110 can be increased.

Also, '

Figure 112015081190324-pat00006
The head portion 141 is simultaneously supported in the width direction and the axial direction of the power piston 130 through the support seating portion 153 formed in the shape of a circle and the valve spring 147 seated on the support seating portion 153, It is possible to disperse the force (pressure) transmitted to the portion 141 to the power piston 130, and also to prevent the detachment by stably supporting the control valve 140.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes and modifications to the scope of the invention.

100. Power cylinder
110. Push rod
111. Seating chin
115. Spring retainer 115a. Step
117. Load spring
120. Air Valve
121. Valve part 122. Pressing projection
123. Rod coupling portion 125. Pressure-
130. Power piston
132. Projections
133. Vacuum chamber 133a. Auxiliary chamber
139. Hanging chin
140. Control Valve
141. Head portion 141a. live
143. Bellows Department
145. Sealing part
145a. Seat portion 145b. Tight contact portion
147. Valve spring
150. Support member
151. Support support
1511. Sliding part 1513. Locking part
153. Support seating part
153a. Support groove 153b. Fixing groove
153c. Fixation projection
200. Brake Booster
210. Front housing 211. Front space
220. Rear housing 221. Rear space
230. Diaphragm
251. Disc
254. Return spring
260. Boots

Claims (10)

A push rod that is moved forward or backward when the brake pedal is operated,
An air valve coupled to the front of the push rod and moved forward or backward together with the push rod,
A power piston formed in a hollow tube shape and installed inside the push rod,
The power piston being slidable along the inner circumferential surface of the power piston and extending in a corrugated shape from one side in contact with the inner circumferential surface of the power piston toward the other side in which the push rod penetrates inward, A support member forming a support groove,
A space between the power piston and the control valve is divided into a plurality of spaces by being coupled to the outer circumferential surface of the support member and moved forward or backward in accordance with the movement of the push rod in a state of being closely attached to the inner circumferential surface of the power piston, A control valve which is in contact with an inner surface of the power piston and opens and closes a space between the control valve and the power piston,
A valve spring which is seated in a support groove formed in front of the support member and resiliently supports the head portion,
And a load spring which is seated in a support groove formed at the rear of the support member and resiliently supports the push rod,
The support member
Is slid in contact with the inner circumferential surface of the power piston,
Figure 112016070943105-pat00012
Shaped support support portion, and
And a shape of a cross section extending from the end of the support supporter toward the push rod side is "
Figure 112016070943105-pat00013
And a support groove is formed at the front and rear of the control valve so as to surround the outer circumferential surface and the inner circumferential surface of the valve spring and the rod spring, And a fixing protrusion for fixing the control valve to the outer surface of the support member is formed on a part of the control valve seated in the fixing groove,
The power cylinder of the brake booster. The method of claim 1,
The interior of the power piston
The inner diameter of the front side inner diameter in which the air valve is disposed is formed to be stepped in the axial direction so that the width of the front side inner diameter becomes relatively small, and a projection in contact with the control valve protrudes axially in the stepped portion. delete The method of claim 1,
The support support portion
A sliding portion that slides in contact with the inner circumferential surface of the power piston,
And an engaging portion which is vertically extended from the sliding portion and is in contact with the engaging jaw formed on the inner peripheral surface of the power piston,
The power cylinder of the brake booster. delete The method of claim 1,
The fixing protrusion
Wherein the support bolt is protruded in the radial direction from the outer circumferential surface of the support seating part and is bent toward one side of the control valve and hooked on one side of the control valve. The method of claim 1,
The control valve
A head portion which is moved forward or backward in the power piston according to the movement of the push rod to selectively contact the inner surface of the power piston and has a rib which is in close contact with the outer circumferential surface of the support seating portion along the circumference of the inner circumference,
A sealing part extending axially from the head part and sealing the space between the control valve in which the valve spring is disposed and the support seat part closely fitted to the outer circumferential surface of the support seat part together with the rib,
A bellows portion extending from the outer peripheral surface of the head portion toward the sealing portion side and connecting the head portion and the sealing portion to each other,
The power cylinder of the brake booster. 8. The method of claim 7,
The sealing portion
A seating part which is seated in the fixing groove and is brought into close contact with the support member,
And a tight contact portion extending radially from the seating portion and closely contacting the inner circumferential surface of the power piston,
The power cylinder of the brake booster. The method of claim 1,
And a spring retainer disposed between the rod spring and the push rod and supported by the rod spring to transmit the elastic force of the rod spring to the push rod. The method of claim 9,
On the outer peripheral surface of the spring retainer
A power cylinder of a brake booster in which a plurality of stepped portions having different outer diameters are formed.
KR1020150117837A 2015-08-21 2015-08-21 power cylinder of break booster KR101675570B1 (en)

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Cited By (1)

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KR20180135592A (en) * 2017-06-13 2018-12-21 주식회사 만도 The break booster of the vehicle

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KR20110109520A (en) * 2010-03-31 2011-10-06 한국델파이주식회사 Power cylinder of break booster
KR20130105962A (en) * 2012-03-19 2013-09-27 주식회사 만도 Brake booster for vehicle

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KR20110109520A (en) * 2010-03-31 2011-10-06 한국델파이주식회사 Power cylinder of break booster
KR20130105962A (en) * 2012-03-19 2013-09-27 주식회사 만도 Brake booster for vehicle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180135592A (en) * 2017-06-13 2018-12-21 주식회사 만도 The break booster of the vehicle
KR102008241B1 (en) * 2017-06-13 2019-08-07 주식회사 만도 The break booster of the vehicle
US11097707B2 (en) 2017-06-13 2021-08-24 Mando Corporation Break booster of the vehicle

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