KR101320876B1 - power cylinder of break booster - Google Patents

Abstract

The present invention relates to a power cylinder for generating a pressure difference between vacuum and atmospheric pressure in a brake booster for increasing the operating force of a brake installed in a vehicle, and more particularly, to a power cylinder of a brake booster for increasing a return pressure when the brake is released. It is about. The power cylinder of the brake booster according to an embodiment of the present invention is a push rod moving forward or rearward by receiving the actuation force of the brake pedal, an air valve positioned in front of the push rod and moving with the push rod, the push A power piston having a rod and the air valve installed therethrough and divided into an atmospheric pressure chamber and a vacuum chamber, opening and closing the vacuum chamber and partitioning the vacuum chamber to form an auxiliary chamber into which air is introduced into a rear space; A head portion having an air inlet hole through which air is introduced into the chamber, a control valve partitioning the atmospheric pressure chamber and the vacuum chamber, a rod spring elastically supporting the push rod so that an elastic force is generated to the rear of the power piston; The head portion elastically forward with respect to the power piston And a support member for supporting the rod spring installed on the push rod, the valve spring being elastically supported to generate the valve spring, and the sealing portion fixed and supported on the inner circumferential surface of the power piston.

Description

Power cylinder of break booster

The present invention relates to a power cylinder for generating a pressure difference between vacuum and atmospheric pressure in a brake booster for increasing the operating force of a brake installed in a vehicle.

Typically, brake boosters are used in vehicles to increase the operating pressure of the brakes. Such brake boosters are classified into brake boosters using hydraulic pressure and brake boosters using vacuum. Brake boosters using hydraulic pressure are used in relatively large vehicles, and brake boosters using vacuum are used in small vehicles.

The conventional brake booster is installed through the diaphragm, the rear housing and the diaphragm which are inserted between the front housing and the rear housing, the front housing and the rear housing which are coupled to each other to form a pressure chamber therein, and partition the pressure chamber. And a return spring for returning the power cylinder to its initial position.

The brake booster of this configuration provides a negative pressure in the intake manifold in the space between the front housing and the diaphragm, and a pressure differential (atmospheric pressure-vacuum) in the space between the front housing and the diaphragm and between the rear housing and the diaphragm by means of a power cylinder To increase the pressure to operate the brakes.

On the other hand, the power cylinder for adjusting the pressure of the brake booster is a control valve formed in the form of a corrugated pipe in the middle portion so as to partition the vacuum space and the atmospheric space and open and close the vacuum space inside the cylinder, and installed through the control valve and brake pedal It is configured to include a push rod that is moved back and forth by receiving the operating force of.

And, the push rod is configured to return to the initial position by the spring in conjunction with the control valve.

However, in the conventional power cylinder, the middle portion of the control valve is formed in a corrugated pipe shape, and thus, when the vacuum space is closed, the corrugated pipe shape portion of the control valve, which is relatively rigid, is pulled into the vacuum space, thereby weakening or pushing the control valve. The force in the opposite direction to the action of the spring to return the rod acts on the spring has a problem that the return force of the push rod is reduced.

The present invention is to solve the problems as described above, the problem to be solved by the present invention is to increase the return force of the push rod by forming an auxiliary chamber in which atmospheric pressure is supplied to the force acting on the control valve due to the pressure difference It is to provide a power cylinder of the brake booster to increase the sealing force of the control valve.

The power cylinder of the brake booster according to an embodiment of the present invention for achieving the above object is a push rod moving forward or rearward by receiving the operating force of the brake pedal, located in front of the push rod with the push rod A moving air valve, a power piston through which the push rod and the air valve are installed, divided into an atmospheric pressure chamber and a vacuum chamber, and opening and closing the vacuum chamber and partitioning the vacuum chamber to form an auxiliary chamber into which air is introduced into a rear space. And a head part having an air inlet hole through which air is introduced into the auxiliary chamber from the atmospheric pressure chamber, and a sealing part sealing the auxiliary chamber, wherein the control valve partitions the atmospheric pressure chamber and the vacuum chamber, and the push rod is a power piston. Resiliently supporting a resilient force against the A de spring, a valve spring elastically supporting the head portion so that an elastic force is generated forward with respect to the power piston, and the sealing portion is fixed and supported on an inner circumferential surface of the power piston so as to be slidably installed. And a support member for supporting the rod spring.

The control valve further includes a sealing portion in close contact with the inner circumferential surface of the power piston, a bellows portion connecting the head portion and the sealing portion, and the auxiliary chamber is formed surrounded by the head portion, the sealing portion, and the bellows portion. Can be.

The head portion may be formed with a rib protruding along the circumference of the head portion to be in close contact with the inner peripheral surface of the power piston.

A plurality of support protrusions supported by the power piston may be further protruded from the circumferential surface of the head part to prevent the flow of the head part.

The support member may further include a support member mounted on the power piston to support the outer surface of the bellows so that a force acting on the bellows may be transmitted to the power piston due to the pressure difference between the vacuum chamber and the atmospheric pressure chamber.

A portion of the bellows portion may be positioned between the support member and the support member to be supported by the support member and the support member.

A locking jaw for limiting the movement of the support member may be formed on the inner circumferential surface of the power piston.

 The power cylinder of the brake booster according to another embodiment of the present invention is a push rod moving forward or rearward by receiving the actuation force of the brake pedal, an air valve positioned in front of the push rod and moving with the push rod, the push A power piston having a rod and the air valve penetrated therein, the head portion being in close contact with an inner circumferential surface of the power piston, opening and closing the vacuum chamber, and an air inlet hole through which the atmosphere of the atmospheric pressure chamber is introduced. A control valve, a rod spring elastically supporting the push rod so as to generate an elastic force rearward with respect to the power piston, a valve spring elastically supporting the head portion so as to generate an elastic force forward with respect to the push rod, and the power Support support supported on the inner circumferential surface of the piston And a support member protruding inwardly from the support support portion, the support member including a support seating portion on which the rod spring and the valve spring are seated, wherein the control valve is in contact with the support member so that the atmosphere of the atmospheric pressure chamber is introduced into the air inlet hole. A secondary chamber is introduced.

The control valve is formed in a ring shape to the outer portion located on the inner circumferential surface of the power piston, a ring shape having a smaller diameter than the outer portion and formed in the inner circumference of the outer portion, and blocking the front ends of the outer portion and the inner portion to each other And a sealing part connected to the inlet hole, wherein the support member includes a contact part protruding from the support seating part to be fitted into the inner part, and the contact part is inserted into the inner part to form the auxiliary chamber.

The outer side portion may be formed with a first rib protruding along the periphery of the outer portion to be in close contact with the inner peripheral surface of the power piston.

The inner side portion may be formed with a second rib protruding along the circumference of the inner portion to be in close contact with the contact portion.

On the outer circumferential surface of the control valve a plurality of support protrusions supported by the power piston may be formed to protrude so as to prevent the flow of the control valve.

An O-ring sealing between the support member and the power piston may be inserted between the support member and the power piston.

The support member may be formed with an O-ring seating groove in which the O-ring is seated.

The support member may be provided with an extension part protruding to surround the outer circumferential surface of the control valve.

A support jaw supporting the front end of the head portion may protrude from the support extension portion.

The control valve may be provided with a support jaw locking portion that the support jaw is over.

The contact portion may protrude forward from an intermediate portion of the support seating portion.

The contact portion may protrude rearward from the inner end of the support seating portion.

The valve spring may be located inside the auxiliary chamber.

According to the present invention, the force acting on the control valve by the pressure difference forms an auxiliary chamber to reduce the occurrence of the pressure difference, and the support member distributes the force caused by the pressure difference to the power piston, thereby reducing the return force of the push rod. It is to provide a power booster of the brake booster which can increase and increase the sealing force of the control valve.

Since the support member supporting the rod spring can be easily moved, the return force of the push rod can be increased.

In addition, there is an effect that the control valve can increase the sealing force for closing the vacuum chamber.

1 is a cross-sectional view illustrating a cross section of a brake booster mounted with a power cylinder of a brake booster according to an embodiment of the present invention.
FIG. 2 is a view illustrating main parts of a power cylinder of a brake booster according to an exemplary embodiment of the present invention, and is an enlarged view of part “A” of FIG. 1.
3 is an enlarged view illustrating main parts of a power cylinder of a brake booster according to another exemplary embodiment of the present invention.
4 is a view showing a modification of the control valve and the support member constituting the power cylinder of the brake booster according to another embodiment of the present invention.
5 is a view showing another modification of the control valve and the support member constituting the power cylinder of the brake booster according to another embodiment of the present invention.

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

First, in the present specification, the left direction of FIG. 1 is referred to as the front, and the right direction of FIG. 1 is referred to as the rear.

As shown in FIG. 1, the brake booster 200 according to an embodiment of the present invention may include a front housing 210 and a rear housing 220. The front housing 210 and the rear housing 220 may be attached to each other to form a pressure chamber therein.

In addition, the brake booster 200 may include a diaphragm 230. The diaphragm 230 may be inserted between the front housing 210 and the rear housing 220 to partition the pressure chamber into the front space 211 and the rear space 221. Meanwhile, the front housing 210 may be connected to an intake manifold (not shown) of the vehicle to generate a negative pressure (vacuum) in the front space 211, thereby acting as a vacuum chamber.

In addition, the rear space 221 normally generates a negative pressure like the front space 211, but when the brake pedal of the vehicle is depressed, the atmosphere may flow in to act as an atmospheric pressure chamber.

The action and effect of the front housing 210, the rear housing 220, and the diaphragm 230 may be configured in the same way as a conventional brake booster, and a detailed description thereof will be omitted.

Meanwhile, the brake booster 200 may include a power cylinder 100. The power cylinder 100 is installed through the rear housing 220 and the diaphragm 230. On the other hand, the power cylinder 100 by supplying and blocking the atmospheric pressure to the rear space 221 by the operating force of the brake pedal, the master cylinder for operating the brakes by the force generated by the pressure difference between the front space 211 and the rear space 221. (Not shown) to operate.

In addition, the brake booster 200 may include boots 260. The boot 260 is formed in the form of a corrugated pipe, it is installed in a form surrounding the power cylinder 100.

As shown in FIG. 2, the power cylinder 100 of the brake booster according to the embodiment of the present invention is installed to penetrate through the through-holes formed in the rear housing 220 and the diaphragm 230, and of the front housing 210. It is supported by a return spring 254 supported on the inner wall of the front housing 210 to generate an elastic force to the rear.

Meanwhile, a reaction disk 251 and a reaction rod 253 are installed in front of the power cylinder 100 to move forward together with the power cylinder 100 when the brake pedal is operated to react with the reaction rod 253. ) Activates the master cylinder that activates the brakes.

The power cylinder 100 according to the embodiment of the present invention may include a push rod 110. The rear of the push rod 110 is connected to a brake pedal and a link mechanism that the driver operates, and may be moved forward or rearward when the brake pedal is operated. Meanwhile, a retainer seating jaw 111 protruding in the circumferential direction may be formed at the front portion of the push rod 110.

In addition, the power cylinder 100 may include an air valve 120. The air valve 120 may be coupled to the front of the push rod 110 and moved forward or rear together with the push rod 110.

The air valve 120 protrudes forward of the disk-shaped valve part 121, the valve part 121, and presses the reaction part 125 to press the reaction disc 251, and protrudes backward of the valve part 121. It may include a rod coupling portion 123 is formed is coupled to the push rod 110.

Meanwhile, the pressing protrusion 122 formed along the circumference of the valve unit 121 may protrude from the rear of the valve unit 121.

In addition, the middle portion of the pressing unit 125 may be formed with a movement limiting projection 126 projected outward. A clip 127 to be described below may be installed between the movement limiting protrusion 126 and the valve unit 121.

The power cylinder 100 may include a power piston 130. The power piston 130 may be installed through the push rod 110 coupled with the air valve 120 in a shape through the inside thereof. On the other hand, the interior of the power piston 130 may be divided into an atmospheric pressure chamber 134 and a vacuum chamber 133, the vacuum chamber 133 and the atmospheric pressure chamber 134 to the control valve 140 to be described later Can be partitioned by

For example, the protrusion 132 is formed to protrude rearward so that a step is formed in the power piston 130, and the control valve 140 is installed in front of the protrusion 312, so that the protrusion 132 and the control valve 140 are formed. The space blocked by) may act as the vacuum chamber 133 and the other portion may act as the atmospheric pressure chamber 134.

In this case, the space between the protrusion 132 and the control valve 140 may be a communication port 131 communicating the vacuum chamber 133 and the atmospheric pressure chamber 134, and the protrusion 132 may be a control valve 140. ) May be formed to protrude along the circumference in the step is formed so as to improve the adhesion.

In addition, the front chamber 133 is such that the negative pressure supplied to the front space 211 between the front housing 210 and the diaphragm 230 acts as a rear space 221 between the rear housing 220 and the diaphragm 230. A plurality of supply holes (not shown) to which the front space 211 and the vacuum chamber 133 are connected may be formed.

Meanwhile, the clip insertion hole 135 may be formed in the power piston 130. The clip insertion hole 135 may be formed to vertically penetrate the longitudinal direction of the power piston 130. In addition, the atmospheric pressure of the atmospheric pressure chamber 133 formed in the power piston 130 may act as the rear space 221 between the rear housing 220 and the diaphragm 230 with the clip insertion hole 135.

In this case, the diaphragm 223 is coupled to the power piston 130 at the front of the clip insertion hole 135, and the rear housing 220 is coupled to the rear of the clip insertion hole 135 to form the diaphragm 230 and the rear. Atmospheric pressure may be applied to the rear spaces 221 between the housings 220.

The power cylinder 100 may include a clip 127. The clip 127 is inserted into the clip insertion hole 135 in the vertical direction of the housing 100 to be coupled between the movement limiting projection 126 formed in the air valve 120 and the valve portion 121. Can be. In this case, the clip 127 may be partially protruded into the clip insertion hole 135 to be configured to cover the front and rear of the clip insertion hole 135 when the air valve 120 moves forward and backward.

On the other hand, the clip 127, the valve rod 121 is in contact with the clip 127 while the push rod 110 is moved forward when the driver presses the brake pedal, in that state continues to move forward to the clip insertion hole ( Clip 127 in front of the 127 may serve to move the entirety of the power cylinder 100 to the front or rear.

At this time, the power cylinder 100 is slidably coupled to the rear housing 220 to move the diaphragm 230 forward or backward in the pressure chamber when the entire power cylinder 100 is moved by the clip 127. Can be.

The power cylinder 100 may include a control valve 140. The control valve 140 partitions the vacuum chamber 133 and the atmospheric pressure chamber 134 of the power piston 130, opens and closes the vacuum chamber 133 formed of the power piston 130, and provides a negative pressure to the atmospheric pressure chamber 134. Can act.

In addition, the control valve 140 may be formed in a ring shape so that the push rod 110 is installed therethrough.

In addition, the control valve 140 may divide the vacuum chamber 133 into two so that the front space acts as a negative pressure and the rear space acts as an auxiliary chamber 133a to which atmospheric pressure is supplied.

In addition, the control valve 140 may have an air inlet hole 141c so that the air in the atmospheric pressure chamber 133 may be supplied to the auxiliary chamber 133a.

The control valve 140 may include a head portion 141. The head part 141 may be seated on the protrusion 132 forming the communication port 131 and may move forward or backward inside the power piston 130 to open and close the vacuum chamber 133. In addition, a plurality of support protrusions 141b may be formed around the outer circumferential surface of the head 141 to support the head 141 inside the power piston 130 and to prevent the flow of the head 141. .

In addition, the head portion 141 is formed along the circumference of the head portion 141 is rib 141a in close contact with the inner peripheral surface of the power piston 130 to partition the vacuum chamber 133 and the auxiliary chamber 133a.

The control valve 140 may include a sealing unit 145. The sealing part 145 may seal the auxiliary chamber 133a.

The control valve 140 may include a bellows portion 143. The bellows portion 143 connects the head portion 141 and the sealing portion 145 and is formed in a corrugated pipe shape so that the head portion 141 is folded or extended when the head portion 141 moves forward and backward to move the head portion 141. I can do it flexibly. A portion of the bellows portion 143 may be formed in a flat plane 143a in the radial direction (vertical direction in the drawing).

Meanwhile, the auxiliary chamber 133a may be formed to be surrounded by the head part 141, the sealing part 145, and the bellows part 143 which are in close contact with the power piston 130.

In addition, an air inlet hole 141c through which air flows from the atmospheric pressure chamber 134 to the auxiliary chamber 133a may be formed in the head part 141. The air inlet hole 141c is formed through the head portion 141 so that the auxiliary chamber 133a and the atmospheric pressure chamber 134 communicate with the portion of the head portion 141 located at the atmospheric pressure chamber 134. , A plurality may be formed.

In the control valve 140 configured as described above, since the auxiliary chamber 133a through which air is supplied is formed at a portion where the bellows portion 143 is located, the bellows portion 143 having a relatively low rigidity due to the pressure difference is formed in the vacuum chamber 133. It can be prevented from being pulled out to increase the sealing force to seal the vacuum chamber 133 the head portion 141, as well as the control valve 140 and the push rod 110 can be easily moved to the rear The return force of the push rod can be improved.

The power cylinder 100 may include a valve spring 147. The valve spring 147 elastically supports the head portion 141 so that an elastic force is generated forward with respect to the power piston 130 or the push rod 110 so that the head portion 141 is in close contact with the protrusion 132. Can be.

On the other hand, the valve spring 147 is located between the head portion 141 and the retainer seating jaw 111 formed in the push rod 110, or the support member (11) seated on the head portion 141 and the power piston 130 ( Located between the 150 may be installed in the form of supporting the head portion 141 elastically.

The power cylinder 100 may include a rod spring 117. The rod spring 117 elastically supports the push rod 110 to generate an elastic force to the rear of the push rod 110 with respect to the power piston 130, and when the pressing force of the brake pedal is released, the push rod ( 110 can be returned to the initial position.

On the other hand, the rod spring 110 is a spring retainer 115 is installed to span the retainer seating jaw 111 formed in the push rod 110, and is located in front of the spring retainer 115 and the power piston 130 It is installed between the support member 150 is seated may be installed in a form that elastically supports the push rod (110).

The power cylinder 100 may include a support member 150. The support member 150 is installed through the push rod 110 and is slidably installed on the inner circumferential surface of the housing 150. The support member 150 may support the valve spring 117 and the rod spring 147 while fixing the sealing portion 145 of the control valve 140.

Meanwhile, the support member 150 protrudes to the inner circumference of the support support part 151 and the support support part 151 supported on the inner circumferential surface of the power piston 130, and the support seat on which the valve spring 147 and the rod spring 117 are seated. It may include a part 153.

In addition, a support groove 151 may be provided with a fixing groove for fixing the sealing portion 145 such that the sealing portion 145 is in close contact with the inner circumferential surface of the housing 110, and the fixing groove may partially support the support support 151. It may be formed in the form of bending.

In addition, a part of the support seat 153 may be formed in a flat plane in the radial direction and may be formed with a seating groove in which the rod spring 150 and the valve spring 147 is seated, the seating groove is a support seat ( 153 may be formed in a form of bending some.

On the other hand, when the support member 150 is installed to be slidably movable in the power piston 130, a locking step 139 is formed on the inner circumferential surface of the power piston 130 to limit the movement in front of the support member 150. Can be.

The power cylinder 100 may include a support member 160. The support member 160 distributes the force generated by the pressure difference to the bellows portion 143 of the control valve 140 that divides the vacuum chamber 133 and the atmospheric pressure chamber 134 by the power piston 130, thereby providing a head portion. 141 may improve the airtightness of sealing the communication port 131, and may increase the return force of the push rod 110.

For example, when the brake pedal is released, the push rod 110 is returned to the initial position by the elastic force of the rod spring 117. At this time, the control valve 140 moves together with the push rod 110 to the rear to return. Should be.

However, since the conventional control valve 140 partitions the atmospheric pressure chamber 134 and the vacuum chamber 133, the bellows portion 143 of the relatively weak rigid control valve 140 is pulled into the vacuum chamber 133. And the return force of the push rod 110 is reduced due to this force.

Therefore, by distributing the force acting on the bellows portion 143 due to the pressure difference as in one embodiment of the present invention to the housing 165 through the support member 160, thereby increasing the return force of the push rod 110. Can be.

On the other hand, the support member 160 may be located between the head portion 141 and the sealing portion 145 of the control valve 140, the outer end of the support member 160 is supported on the inner peripheral surface of the power piston 130 The inside of the support member 160 may be installed to support the bellows portion 143.

In addition, the support member 160 may be installed to be slidable along the inner circumferential surface of the power piston 130, and move forward of the support member 160 on the inner circumferential surface of the power piston 130 on which the support member 160 is installed. The locking step 137 may be formed.

In addition, the support member 160 is located on the inner circumference of the seating portion 161 seated on the inner circumferential surface of the power piston 130, the bellows support 163 supporting the outer surface of the bellows portion 143, seating It may include a connecting portion 165 connecting the portion 161 and the bellows support 163.

On the other hand, when a part of the bellows portion 143 is formed in the plane (143a), the connection portion 165 of the support member 160 may be configured to support the bellows portion plane (143a).

For example, the plane of the bellows portion 143a is positioned in front of the support connecting portion 155 formed in the plane of the support member 150, and the connecting portion 165 of the support member 160 is positioned in contact with each other in front of the support connecting portion 155. The bellows portion 143 may be configured to support the support member 150 between the support member 160.

On the other hand, the bellows support portion 163 of the support member 150 is located outside the portion formed in the form of corrugated pipe except for the portion formed in some plane of the bellows portion 143 so that the bellows portion 143 is the vacuum chamber 133 It may be formed along the longitudinal direction of the corrugated pipe portion of the bellows portion 143 so as to prevent being pulled into the interior of the bellows portion 143.

Actions and effects between the components of the power cylinder according to the above-described embodiment will be described.

The power cylinder 100 of the brake booster according to an embodiment of the present invention is normally provided in the front space 211 between the front housing 210 and the diaphragm 230 by an intake manifold when the brake pedal is not operated. A negative pressure is generated, and the negative pressure introduced into the atmospheric pressure chamber 134 through the vacuum chamber 133 of the power piston 100, and the negative pressure introduced into the atmospheric pressure chamber 134 are connected to the rear housing 220 through the clip insertion groove 135. And a back space 221 between the diaphragm 230.

At this time, the head portion 141 of the control valve 140 is a vacuum chamber (with a predetermined interval spaced rearward from the protrusion 132 by the pressing protrusion 122 formed in the valve portion 121 of the air valve 120 ( 133 is opened to generate underpressure in both the vacuum chamber 133 and the atmospheric pressure chamber 135.

Subsequently, when the brake pedal is operated, the push rod 110 moves forward and at the same time, the valve 121 and the diaphragm 230 of the air valve 120 move forward, and the rear housing 220 and the diaphragm 230 are moved. The atmosphere flows in between). At this time, the head portion 141 is in close contact with the protrusion 132 by the valve spring 147 to block the negative pressure of the front space 211 acting as the rear space 221.

When the atmospheric pressure acts on the rear space 221, the diaphragm 230 moves forward due to the pressure difference between the front space 211 and the rear space 221 partitioned by the diaphragm 230, thereby increasing the operating pressure of the brake pedal. You can.

On the other hand, when the operation of the brake pedal is released, the push rod 110 is moved backward by the rod spring 117, the push rod 110 is moved at the same time the valve portion 121 is in contact with the head portion 141. As a result, the head portion 141 is spaced apart from the protrusion 132 to apply negative pressure to the rear space 221 again.

On the other hand, when the push rod 110 is to return the elastic force of the rod spring 117, due to the pressure difference, the support member 160 is a power piston (A) to pull the force pulled into the interior of the vacuum chamber 133 At the same time, the air may be supplied to the auxiliary chamber 133a to reduce the occurrence of a pressure difference acting on the bellows portion 143.

Therefore, there is an effect that can increase the restoring force that the push rod 110 can be returned to the initial state.

In addition, the head 141 is in close contact with the protrusion 132 forming the communication port 131 has an effect that can be increased.

3 is an enlarged view illustrating main parts of a power cylinder of a brake booster according to another exemplary embodiment of the present invention. In another embodiment, the same configuration as the one embodiment has the same reference numerals and the same operation and effect, so a detailed description thereof will be omitted.

The power cylinder of the brake booster in another embodiment has the same configuration as the one embodiment, but is featured in the control valve 340 and the support member 350.

The control valve 340 according to another embodiment divides the vacuum chamber 133 and the atmospheric pressure chamber 134, and moves forward and backward by the air valve 120 and the valve spring 147 to move the vacuum chamber 133. Can be opened and closed.

Meanwhile, the vacuum chamber 133 may be positioned in front of the control valve 340, and the auxiliary chamber 133a may be formed at the rear of the control valve 340. In addition, an air inlet hole 345a through which the atmosphere of the atmospheric pressure chamber 133 flows into the auxiliary chamber 133a may be formed in the control valve 340.

On the other hand, a plurality of support protrusions 341b are formed on the outer circumferential surface of the control valve 340 to prevent the control valve 340 positioned inside the power piston 130 from moving forward or backward. can do.

In addition, the control valve 340 may be formed with a first rib 341a protruding outward along the circumference of the outer circumferential surface of the control valve 340. The first rib 341a may be in close contact with the inner circumferential surface of the power piston 130 to partition the vacuum chamber 133 and the auxiliary chamber 133a located at the front and the rear of the control valve 340.

In addition, the control valve 340 may be formed with a second rib 343a protruding along the circumference of the inner circumferential surface of the control valve 340. The second rib 343a may be in contact with the support member 350 to form the auxiliary chamber 133a.

Meanwhile, the first rib 341a and the second rib 343a may be manufactured separately from the control valve 340 and attached to the control valve 340, and may be made of rubber or synthetic resin to improve airtightness. It may be formed of a soft material such as silicon.

The control valve 340 may include an outer portion 341. The outer portion 341 is formed in a ring shape and may be located on an inner circumferential surface of the power piston 130. In this case, the first rib 341a and the support protrusion 341b may be formed on an outer circumferential surface of the outer portion 341.

The control valve 340 may include an inner portion 343. The inner portion 343 may be formed in a ring shape so as to have a diameter smaller than the diameter of the outer portion 341 and may be positioned at an inner circumference of the outer portion 341. In this case, the second rib 343a may be formed on the outer circumference or inner circumferential surface of the inner portion.

In addition, the control valve 340 may include a seal 345. The seal 345 may be connected to each other to seal the front ends of the outer portion 341 and the inner portion 343. On the other hand, the air inlet hole 345a through which the air flows may be formed in the sealing part 345. The air inlet hole 345a has an atmospheric pressure chamber 134 in the seal 345 so that air in the atmospheric pressure chamber 134 located in front of the seal 345 can be supplied to the rear of the seal 345. It may be formed to penetrate the sealing portion 345 in the portion to be located.

On the other hand, the control valve 340 may be formed in a donut shape having a thickness, and also in the form of forming a groove on the back.

The support member 350 supports the valve spring 147 and the rod spring 117 and contacts the control valve 340 to surround a part of the inner circumferential surface of the power piston 130 along with the control valve 340 along the circumference. Form the auxiliary chamber 133a in the form.

On the other hand, between the support member 350 and the power piston 130, an o-ring (360) for sealing between the support member 350 and the power piston 130 may be installed.

On the other hand, the support member 350 may include a support support 351. The support support part 351 is formed in a ring shape and is supported by the inner circumferential surface of the power piston 130 to support the support member 350 in the power piston 130.

In addition, the support support 351 may be formed with an O-ring seating groove 351a on which the O-ring 360 is seated. The seating groove 351a may be formed to partially bend the support support 351.

The support member 350 may include a support seating portion 353. The support seat 353 may be mounted with a valve spring 147 and a rod spring 117.

For example, as in other embodiments, the valve spring 147 is seated at the rear of the control valve 340 and more specifically at the rear of the seal 345 and the support seat 353, and the support seat 353. The rod spring 117 may be configured to be seated between the rear of the retainer 115 and the retainer 115 coupled to the push rod 110.

That is, since the valve spring 147 is located inside the auxiliary chamber 133a, the valve spring 147 may be prevented from being contaminated and the valve spring 147 may be prevented from coming off.

Meanwhile, the support seating portion 353 may be provided with seating grooves 353a on which the valve spring 147 and the rod spring 117 are seated, and each of the seating recesses 353a is the support seating portion 353. It may be formed in the form of bending some.

In addition, the support member 350 may be provided with a contact portion 355 in contact with the inner portion 343 of the control valve 340.

The contact portion 355 protrudes from the support seating portion 353 to a predetermined length so as to contact the inner portion 343 in a form overlapping with the inner circumference or the outer circumference of the inner portion 343, for example, to be fitted to each other, and the inner portion 343. It can be formed along the perimeter of.

In this case, the second rib 343a formed at the inner portion 343 may be formed to be in close contact with the contact portion 355 to hermetically seal the auxiliary chamber 133a. Here, the contact portion 355 is formed to protrude to a length enough to be in contact with the inner portion 343 even when the control valve 340 is moved forward.

On the other hand, in the embodiment, the contact portion 355 protrudes forward of the support support portion 353, the inner portion 147 is located in the inner circumference of the contact portion 355, and the second rib 343a formed on the inner portion 147 is formed. The contact portion 355 is configured to be in contact.

4 is a view showing a modification of the control valve and the support member of another embodiment. The support member 340 of the modification has an outer circumferential surface of the control valve 340. More specifically, the outer portion 341 constituting the control valve 340 is shown. An extension part 357 surrounding the outer circumferential surface thereof may be further formed. The extension part 357 may be formed to extend from the support support part 353 or the support seating part 353.

In addition, a support jaw 357a may be formed at the end of the extension part 357 to cover the front end of the control valve 340. In this case, the support valve locking portion 345b may be formed in the control valve 340 to support the support jaw 357a formed in the extension portion 357. The supporting jaw locking portion 345b may be formed as a groove having a shape corresponding to the supporting jaw 357a so that the supporting jaw 357a can be spread therethrough.

By further forming the extension part 357 in the support member 350, the extension part 357 surrounds the outer surface of the control valve 340, rather than the control valve 340 is in direct contact with the housing. ) Can be further improved.

5 is a view showing another modification of the control valve and the support member of another embodiment, the control valve 340 and the support member 350 of the other modification is the same as the modification, but constitutes the support member 350 The contact portion 355 protrudes from the inner end of the support seating portion 353 to the rear where the rod spring 117 is positioned, and the inner portion 343 constituting the control valve 340 extends further to the rear so that It was comprised so that the inner peripheral surface of the support seating part 353 might be contacted. Therefore, the space of the auxiliary chamber 133a can be made larger so that more air can be supplied to the auxiliary chamber 133a.

The power cylinder according to another embodiment described above can form a relatively simple structure of the control valve 340 can reduce the manufacturing cost, the control valve 340 is the bellows portion 143 as in one embodiment Since it is not connected to the control valve 340 is easy to move.

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: retainer seating jaw 115: spring retainer
117: rod spring 120: air valve
121: valve portion 122: pressure projection
123: rod coupling portion 125: pressing portion
126: movement limit projection 127: clip
130: power piston 131: communication port
133: vacuum chamber 133a: auxiliary chamber
134: atmospheric chamber 135: clip insertion hole
137, 139: locking step 140, 340: control valve
141: head portion 141a: rib
141b and 341b: support protrusion 141c and 345a: air inlet hole
143: bellows portion 143a: flat surface of bellows portion
145: sealing portion 147: valve spring
150,350: support member 151,351: support support
153, 353: support seat 160: support member
161: seating portion 163: bellows support portion
165: connection part 200: brake booster
210: front housing 211: front space
220: rear housing 221: rear space
230: diaphragm 251: reaction disc
253: reaction rod 254: return spring
260: boots 341: outside
341a: first rib 343: inner part
343a: second rib 345: sealing portion
345b: support jaw engaging portion 355: contact portion
357: extension portion 357a: support jaw
360: O-ring

Claims (20)

A push rod moving forward or backward by receiving the actuation force of the brake pedal,
An air valve positioned in front of the push rod and moving with the push rod,
A power piston in which the push rod and the air valve are installed and partitioned into an atmospheric pressure chamber and a vacuum chamber,
The vacuum chamber is opened and closed, and the vacuum chamber is partitioned to form an auxiliary chamber into which air is introduced into a rear space, and a head part having an air inlet hole through which air is introduced into the auxiliary chamber from the atmospheric pressure chamber and a sealing sealing the auxiliary chamber. A control valve which comprises a portion and partitions the atmospheric pressure chamber and the vacuum chamber,
A rod spring elastically supporting the push rod so that an elastic force is generated rearward with respect to the power piston,
A valve spring elastically supporting the head portion to generate an elastic force forward with respect to the power piston, and
And a support member fixed to the sealing part, supported on the inner circumferential surface of the power piston, slidably installed, and supporting the rod spring installed on the push rod.
The control valve
Sealing part in close contact with the inner peripheral surface of the power piston,
Further comprising a bellows portion for connecting the head portion and the sealing portion,
The auxiliary chamber is a power cylinder of the brake booster is formed surrounded by the head portion, the sealing portion and the bellows portion. delete In claim 1,
The head portion of the power booster of the brake booster is formed with a rib protruding along the circumference of the head portion to be in close contact with the inner peripheral surface of the power piston. In claim 1,
The power cylinder of the brake booster is formed on the circumferential surface of the head portion further protrudes a plurality of support protrusions supported by the power piston to prevent the head portion from flowing. In claim 1,
And a support member seated on the power piston to support the outer surface of the bellows portion such that a force acting on the bellows portion is transmitted to the power piston due to the pressure difference between the vacuum chamber and the atmospheric pressure chamber. The method of claim 5,
And a portion of the bellows portion is positioned between the support member and the support member and is supported by the support member and the support member. In claim 1,
The power cylinder of the brake booster is formed on the inner circumferential surface of the power piston a locking step for limiting the movement of the support member. A push rod moving forward or backward by receiving the actuation force of the brake pedal,
An air valve positioned in front of the push rod and moving with the push rod,
A power piston in which the push rod and the air valve are installed and partitioned into an atmospheric pressure chamber and a vacuum chamber,
A control valve in close contact with an inner circumferential surface of the power piston, the control valve including a head part which opens and closes the vacuum chamber and has an air inlet hole through which the atmosphere of the atmospheric pressure chamber is introduced;
A rod spring elastically supporting the push rod so that an elastic force is generated rearward with respect to the power piston,
A valve spring elastically supporting the head portion to generate an elastic force forward with respect to the push rod, and
A support member including a support support portion supported on an inner circumferential surface of the power piston and a support seating portion protruding inward from the support support portion, and on which the rod spring and the valve spring are seated;
The control valve is in contact with the support member forms an auxiliary chamber into which the atmosphere of the atmospheric pressure chamber flows into the air inlet,
The control valve is formed in a ring shape to the outer portion located on the inner circumferential surface of the power piston, a ring shape having a smaller diameter than the outer portion and formed in the inner circumference of the outer portion, and blocking the front ends of the outer portion and the inner portion to each other It includes a sealing portion connecting and the inlet hole,
The support member includes a contact portion protruding from the support seating portion to be fitted to the inner portion,
And the contact portion is fitted to the inner portion to form the auxiliary chamber. delete 9. The method of claim 8,
The outer cylinder is a power cylinder of the brake booster is formed with a first rib protruding along the periphery of the outer portion to be in close contact with the inner peripheral surface of the power piston. 9. The method of claim 8,
And a second rib protruding along the circumference of the inner part to be in close contact with the contact part. 9. The method of claim 8,
A power cylinder of the brake booster is formed on the outer circumferential surface of the control valve protrudes a plurality of support protrusions supported by the power piston to prevent the flow of the control valve. 9. The method of claim 8,
A power cylinder of a brake booster is inserted between the support member and the power piston is an O-ring sealing between the support member and the power piston. In claim 13,
The support member of the power booster of the brake booster is formed with an O-ring seating groove in which the O-ring is seated. 9. The method of claim 8,
The support member of the power booster brake cylinder is formed with an extension protruding to surround the outer peripheral surface of the control valve. 16. The method of claim 15,
The support cylinder is a power booster of the brake booster protruding support jaw for supporting the front end of the head portion. 17. The method of claim 16,
The control valve is a power cylinder of the brake booster is formed with a support jaw engaging portion that the support jaw is over. 9. The method of claim 8,
And the contact portion protrudes forward from the middle portion of the support seating portion. 9. The method of claim 8,
The contact portion is a power cylinder of the brake booster protruding toward the rear from the inner end of the support seating portion. 9. The method of claim 8,
The valve spring is a power cylinder of the brake booster is located inside the auxiliary chamber.

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