JPS5919864B2 - pneumatic booster - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pneumatic booster.

Pneumatic boosters are widely used to reduce the human effort required to operate brake mask cylinders and clutch release mask cylinders. It is designed to push a piston.

Therefore, in order to apply these boosters to devices that require input or tensile force, such as a wire-type clutch release system or an accelerator link system, a means for changing the direction of force, such as a lever, is required.

The present invention is a pneumatic booster which is operated by pulling an input member protruding to one side of a case, and can provide a tensile output to an output member protruding to the other side of the case, and which has a simple configuration. The purpose is to obtain the following.

In the pneumatic booster of the present invention, an input member is passed through the center of one side wall of a case formed by combining two housings, and an output sleeve is passed through the center of the other side wall in an airtight and slidable manner. The inside of the case is adjacent to one side of a diaphragm, the outer periphery of which is airtightly clamped by the two housings, and the inner periphery of which is fitted to the outer periphery of the sleeve so as to be able to slide within a certain range in an airtight manner. A movable wall comprising a guide member slidable on the outer periphery of the sleeve provides a constant pressure chamber on one side of the movable wall and constantly communicating with a vacuum source, and a constant pressure chamber on the other side of the movable wall and through the inside of the output sleeve. and a variable pressure chamber that selectively communicates with the atmosphere, a first annular valve seat having a large diameter formed on the inner wall of the output sleeve, and a first annular valve seat with a large diameter formed on the inner wall of the output sleeve, and a variable pressure chamber that is slidable in an airtight manner within the output sleeve. a second annular valve seat having a small diameter formed at an end of the input member fitted into the input member; and an annular valve cooperating with both valve seats, and normally communicating the variable pressure chamber with the constant pressure chamber. A valve mechanism is provided on one side of the movable wall to connect the variable pressure chamber from the constant pressure chamber to the atmosphere when the input member is pulled toward one side with respect to the output sleeve. A radial hole in the output sleeve is passed through between the reaction disk and the movable wall, one end of which is engaged with a recess on the outer periphery of the input member, and the other end of the output sleeve is engaged with the recess on the outer circumference of the input member. A reaction lever is provided which is engaged with the member and whose intermediate portion is engaged with the reaction disk.

The present invention will be further clarified by describing one embodiment of the present invention.

Case 1a is formed by combining housings 1 and 2, and an input member 6 is inserted into the center of the left side wall of case 1a, and an output sleeve 5 is inserted through the center of the right side wall in an airtight and slidable manner. I'm being forced to do it.

The outer peripheral flange portion 3a of the diaphragm 3 within the case 1a is airtightly sandwiched between the housings 1 and 2 at a joint portion 1b between the two housings.

The inner periphery 30 of the diaphragm 3 is fitted to the outer periphery of the output sleeve 5 in an airtight and slidable manner.

The guide member 4 adjacent to the left side of the diaphragm 3 has its inner circumference 4b slidably fitted into the sleeve 5, and the guide member 4 and the diaphragm 3 move inside the case 1a between the constant pressure chamber 31 on the left side and the flexible chamber on the right side. It constitutes a movable wall that divides the chamber into a variable pressure chamber 32.

The rightward sliding limit of this movable wall relative to the output sleeve 5 is defined by a locking ring 11 .

The right end portion of the input member 6 is slidably fitted into the output sleeve 5 in an airtight manner.

A small diameter annular valve seat 7 is formed on the right end of the input member 6, a large diameter annular valve seat 34 is formed on the inner wall of the output sleeve 5, and an annular valve 8 is installed on the right side of these valve seats. .

This annular valve 8 is biased leftward by a weak spring 16, and the input member 6 is connected to a land 19 biased rightward by a spring 18. Normally, as shown in the figure, the annular valve 8 is biased toward the annular valve seat. One annular valve seat 3 seated at 7
The variable pressure chamber 32 is spaced apart from the hole 101 chamber 35 of the output sleeve 5 - the gap between the i-shaped valve seat 34 and the annular valve 8 -
It communicates with the constant pressure chamber 31 through the hole 9 of the output sleeve 5.

Further, when the input member 6 is pulled to the left with respect to the output sleeve 5, the annular valve 8 is seated on the annular valve seat 34 while being separated from the annular valve seat 7, and the variable pressure chamber 32 is opened in the hole. 1
〇 One chamber 35 Gap between the annular valve seat 7 and the annular valve 8 -
The internal space of the output sleeve 5 - the air cleaner 20 - communicates with the atmosphere through a hole in the plug 21 .

In this way, the annular valve seat 7.34 and the annular valve 8 constitute a valve mechanism that switches the variable pressure chamber 32 into communication with the constant pressure chamber 31 and the atmosphere.

Here, the constant pressure chamber 31 is always in communication with the engine intake manifold as a vacuum source, the input member 6 is connected to a clutch pedal 33 at its left end, and the output sleeve 5 is connected to the clutch release via a rod 23 that moves together with the plug 21. It is connected to a cable.

On the left side of the movable wall, a reaction disk 12 is installed on the output sleeve 5 , and the inner circumference 12 a of this reaction disk 12 is locked to the output sleeve 5 by a flange 27 at the left end of the output sleeve 5 .

A reaction lever 1 is provided between the reaction disk 12 and the guide member 4.
A suitable number of 4 are provided.

Each recoil lever 14 passes through a radial hole 2B of the output sleeve 5, one end 14a of which engages in a recess on the outer periphery of the output member 6, and the other end 14b engages with the guide member 4, and It engages with the outer peripheral portion 12b of the reaction disk 12 between both ends.

The engagement between the inner end 14a of the reaction lever 14 and the recess 36 connects the input member 6 and the output sleeve 5 so that they can be slid relative to each other by a certain amount.

In order to prevent the reaction lever 14 from falling off, the guide member 4 is provided with a cut-out portion 29 located on the radially outer side of the other end 12b of the reaction lever 14.

A spring 13 that biases the output sleeve 5 to the right is installed in the constant pressure chamber 31, and in normal times when there is no pressure difference between the constant pressure chamber 31 and the variable pressure chamber 32, the biasing force of the spring 13 is Based on this, each member is held in the state shown in the figure, and the protrusion 4a on the right side of the diaphragm 3 is in contact with the housing 3.

In addition, 15, 24, and 25 in the figure are seals.

The operation of the above configuration will be explained next.

When the driver depresses the clutch pedal 33 in the state shown, the input member 6 is pulled to the left.

As a result, the annular valve 8 is seated on the annular valve seat 34 and the variable pressure chamber 32 is isolated from the constant pressure chamber 31, and the annular valve 8 is separated from the annular valve seat 7 and the variable pressure chamber 32 is communicated with the atmosphere. Therefore, a pressure difference is generated between the two chambers 31 and 32, and a leftward assisting force is generated on the movable wall made up of the diaphragm 3 and the guide member 4.

On the other hand, due to the leftward movement of the input member 6, the reaction lever 14
One end 14a abuts against the right side surface of the recess 36.

Thus, the leftward input applied to the input member 6 and the leftward assistance generated in the movable wall are applied to the reaction lever 14 and the reaction disk 1.
2 to the output sleeve 5, and the output sleeve 5
and the movable wall moves to the left, thus disengaging the clutch.

During this operation, the input of the input member 6 and the assisting force of the movable wall are opposed to each other by the reaction lever 14, and the input member 6 is moved by the lever movement of the reaction lever 14 based on this opposing relationship.
slides with respect to the output sleeve 5, and the annular valve 8 and the annular valve seats 7, 34 are seated and separated, so that the input and the assisting force are proportional.

As is clear from the above explanation, the pneumatic booster of the present invention operates by pulling the input member protruding from one side of the case, and a tensile output is obtained from the output sleeve protruding from the other side of the case. When applied to a wire-type clutch release system or an accelerator ring system, no means for changing the direction of force is required.

Furthermore, since the reaction lever is used as a means for locking the input member to the output sleeve, the number of component parts is small and manufacturing is possible at low cost.

[Brief explanation of the drawing]

The drawing is a central vertical sectional view of an embodiment of the present invention. 1a... Case, 3... Diaphragm, 4... Guide member, 5... Output sleeve, 6... Input member, T. ...Annular valve seat, 8...Annular valve, 12...Reaction disk, 14...Reaction lever, 29....Cut up Part, 34... Annular valve seat, 36...
・Concavity.

Claims (1)

[Claims] 1 A manpower member is passed through the center of one side wall of a case formed by combining two housings, and an output sleeve is passed through the center of the other side wall in an airtight and slidable manner, and the inside of the case has an outer periphery that extends between the two housings. a diaphragm which is airtightly clamped and whose inner periphery is fitted to the outer periphery of the sleeve so as to be able to slide within a certain range in an airtight manner; A movable wall comprising a guide member selectively communicates the constant pressure chamber with the atmosphere on one side of the movable wall and constantly communicating with the vacuum source, and on the other side of the movable wall and through the interior of the output sleeve. A variable pressure chamber is divided into a variable pressure chamber, and the output sleeve includes a first annular valve seat having a large diameter formed on the inner wall of the output sleeve, and an end portion of the input member that is slidably fitted in an airtight manner into the output sleeve. a second annular valve seat with a small diameter formed in the second annular valve seat, and an annular valve that cooperates with both the valve seats;
Usually, a valve mechanism is provided that communicates the variable pressure chamber with the constant pressure chamber or switches the variable pressure chamber from the constant pressure chamber to the atmosphere when the input member is pulled in one direction with respect to the output sleeve. A reaction disk is provided on one side of the movable wall, and a radial hole of the output sleeve is passed through between the reaction disk and the movable wall, and one end thereof is connected to the output sleeve. A pneumatic doubler, characterized in that a recoil lever is provided which is engaged with a recess on the outer periphery of the input member, whose other end is engaged with the guide member, and whose intermediate portion is engaged with the recoil disc. force disorder