JPS5977954A - Traction type booster - Google Patents

Abstract

PURPOSE:To unnecessitate screw cutting and enhance productivity, by a method wherein a block having a cylindrical part for transmitting a moving force of a movable body to an output member is supported by a supporting member fitted to the outside periphery of a hub part of the movable body. CONSTITUTION:The block 44 is fitted into an opening part of a through-hole 19 provided at the hub part 18 of the movable body 14, and is supported by a stopping member 46 fitted to the outside periphery of an end part of the hub part 18. The stopping member 46 is substantially cup shaped, and is provided with a bottom plate part 48 making contact with the block 44 and a cylindrical part 49 externally fitted to the hub part 18, the cylindrical part 49 is provided with a plurality of pawls 51 engaged into a groove 50 provided in the outside periphery of the hub part 18 and a plurality of pawls 52 extended outwards in the radial direction. The block 44 is provided with a cylindrical part 45, which can be brought into contact with a rubber-made disk 39 connected to the output member 42. Accordingly, the moving force of the movable member 4 is transmitted to the output member 42 through the stopping member 46, the cylindrical part 45 and the disk 39.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traction type booster for assisting operating force in a brake or clutch device of a vehicle or the like.

The present applicant previously proposed a cylindrical body which is movably inserted into the main body, partitioning a low-pressure chamber on one side and a high-pressure chamber on the other side, and extending through the main body to the other side. an input member extending from one side of the cylindrical portion to the outside of the main body; an output member extending from the other side of the cylindrical portion; a valve device that controls the low-pressure chamber and the high-pressure chamber to generate a pressure difference that urges the movable body to one side in accordance with human power; We proposed a system that transmits the information to the output member.

However, as a means for transmitting a moving force from the cylindrical portion to the output member, the output member is directly or indirectly engaged with a block screwed onto the cylindrical portion;
The fact that both the cylindrical portion and the block are made of synthetic resin material causes the following problems.

That is, forming a threaded surface on each member by machining requires time and effort, lowering production efficiency, and the machined portion is often damaged during threading, resulting in a high incidence of defective products. On the other hand, in the method of forming a threaded surface during the molding step, it is not possible to form the threaded surface around the entire circumference of each member, resulting in problems such as insufficient threading strength or complicated work in the molding process.

The present invention has been made in view of the above problems, and aims to provide a towed booster capable of improving production efficiency. A support member is disposed in the shape of a tip, has a hole through which the output member passes through at the bottom, and a protrusion on the side that engages with the other end, and transmits the output through the support member. It is something.

In other words, since the support member is attached to the end of the cylindrical part and the moving force is transmitted to the output member through the support member, there is no need for screw machining, and the shape of the cylindrical part can be adjusted. This also simplifies the process, improves workability in the molding and machining stages, and improves production efficiency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The traction type booster of the present invention will be explained in detail below based on illustrated embodiments.

FIG. 1 is a side sectional view of a traction type booster which is an embodiment of the present invention.

In the figure, the tow-type booster is indicated as a whole by 1, with a tip-shaped glue 2 and a dish-shaped front shell 3.
A space 5 is formed in the main body 4 between the stepped portion 6 of the rear shell 2 and the flange portion 7 and cylindrical portion 8 of the front shell 3. While compressing the outer peripheral bead 10 of the diaphragm 9, the front shell 3
Both shells 2 and 3 are joined by engaging the flange 7 with the protrusion 11 of the rear shell 2.

A plate-shaped synthetic resin movable body 14 in which the inner bead 12 of the diaphragm 9 is fitted into the groove 13 is movably inserted into the space 5, and a negative pressure chamber 15 is provided on the rear shell 2 side, and a negative pressure chamber 15 is provided on the front shell side. Variable pressure chambers 16 are divided into three sides.

The opening 1 of the front shell 3 is located in the center of the movable body 14.
A hub portion 18 into which the movable body 14 is slidably fitted is integrally molded, and a stepped through hole 19 is bored in the axial direction of the movable body 14 including the hub portion 18.

Fitted into the left end of the through hole 19 is an input member 21 that extends through the rear shell 2 and has an external end screwed onto a frame 20 that is connected to a clutch pedal (not shown). Plunger 2 slidably connected to member 21
2 is a medium diameter portion 23 and a small diameter portion 24 on the left side of the through hole 19.
It is slidably fitted.

On the right side of the plunger 22, a relatively long and small-diameter stem 25 extending toward the right is integrally provided, and a pot-shaped casing 27 can be attached to a head 26 formed at the end of the stem 25. The head 26 is slidably fitted into the casing 27 through the hole 27a. Between the casing 27 and the main body portion of the plunger 22, there is a valve spring 30 formed integrally with a conical coil spring portion 28 and a cylindrical coil spring portion 29, and a valve seat 31 formed on the plunger 22 by the valve spring 30. and a valve member 33 made of rubber that is urged to be seated on a valve seat 32 formed on the inner wall of the through hole 19. The right end of the conical coil spring portion 28 of the valve spring 30 is connected to the casing 27
Further, the left ring of this portion 28 is adapted to press the right end of the poppet-shaped valve member 33 toward the step portion 34 of the through hole 19 . The cylindrical coil spring portion 29 also connects the left end seat portion 35 of the valve member 33 to each valve seat 31.
．． 32. 36.37
is a spring holder.

Inside the casing 27, plate rings 3 are installed in order from the left side.
8. A rubber disk 39 and a plate ring 40 are movably inserted in this order, and are prevented from coming off by a plurality of protrusions 41 formed on the right end of the casing 27. One end of an output member 42 is fitted into the casing 27 by passing through each member disposed inside the casing 27, and a head 43 formed at the left end of the output member 42 makes spherical contact with the plate ring 38. It is like that.

Between the outer periphery of the output member 42 and the plate ring 40, the cylindrical portion 45 of the block 44, which is fitted into the opening of the through hole 19, is movably fitted and can come into contact with the right end surface of the disk 39. This block 44 is supported by a stopper member 46 as a support member fitted to the outer periphery of the end portion of the hub portion 18. A plate ring-shaped reinforcing member 4 having an inner hole approximately equal to the outer diameter of the output member 42 is provided in a part of the disk 39 facing the gap between the cylindrical portion 45 and the output member 42.
7 are integrally arranged, and the outer diameter of the reinforcing member 47 is larger than the inner hole at the left end of the cylindrical part 45. In other words, the cylindrical part 45 and the output member 42 The gap between the disks 39 and 39 is sufficiently large so that they do not directly oppose each other. The stopper member 46 has a substantially cup-like shape and includes a bottom plate portion 48 that contacts the block 44 and a cylindrical portion 49 that fits onto the hub portion 18 . A large number of pawls 51 that can be engaged with the grooves 50 and a large number of pawls 52 that extend radially outward are provided.

An annular portion 54 of a boot 53 disposed to cover the entire hub portion 18 is fitted into the claw 52 of the stopper member 46, and the boot 53 is held by the stopper member 46. Furthermore, a cup-shaped accommodating portion 55 is integrally formed on the right side of the annular portion 54 of the boot 53, and a plurality of filters 56 are inserted between the accommodating portion 55 and the stopper member 46. Further, a retractable bellows part 57 is integrally provided on the left side of the annular part 54 of the boot 53, and a bellows part 57 is provided at the left end of the bellows part 57 between the hub part 18 and the opening 17 of the front shell 3. A lip-shaped seal portion 59 that is fitted with a stopper 58 is integrally provided. A sliding ring 61 is disposed on the left side of the seal portion 59 and is prevented from being removed by a retaining ring 60.

The through hole 19 of the hub portion 18 is formed by a large number of grooves 62 formed on the side circumference of the block 44 and a large number of holes 63 formed on the side circumference of the stopper member 46, so that the filter 56 and the boot 53 can be connected to each other.
It communicates with the atmosphere through holes in the air. Furthermore,
The variable pressure chamber 16 has a hole 64 provided along the radial direction of the hub portion 18.
, it communicates with the space around the plunge +22, and
The negative pressure chamber 15 communicates with the space around the valve member 33 through a hole 65 extending along the axial direction. In addition, negative pressure chamber 1
5 is connected to a negative pressure source (engine intake manifold, vacuum pump, etc.) through a connector 66 welded near the corner of the rear shell 2.

The movable body 14 is biased to the right by a preload spring 67 arranged between it and the rear shell 2.

There is a rear shell 2 between the input member 21 and the Asiel 2.
A sealing device 69 is disposed within the four parts 68 of the housing.

This sealing device 69 includes a ring-shaped synthetic resin slide plate 70 that fits into the input member 21 with almost no gap, and a rubber sealing member 71 that covers the entire left side of the slide Fj, 70. and 7, both are connected to each other and integrated through the unevenness. The slide plate 7o has a recess 6
8 on the bottom surface and on the input member 21,
The sealing member 71 has a lip part 72 that comes into elastic contact with the input member 21 at its inner peripheral end, and a fixing part 73 for a core insert that is press-fitted into the corner of the recess 68 at its outer peripheral end. A flexible communication portion 74 is provided between the inner circumferential side portion including the lip portion 72 and the fixing portion 73 and allows the inner circumferential side portion to be displaced. 73 is prevented from being removed, and the outer peripheral side portion of the communication portion 74 is held down.

Furthermore, a second lip portion that fits on the outer periphery of the slide plate 7o?
2a is in close and slidable elastic contact with the bottom surface of the four parts 6B, and the space 68 between the fixing part 73 and the lip part 72a
a communicates with the outside air through a small hole 74a formed in the communication 74 and having a relatively small passage surface. Note that each lip portion 72, 72a is formed with a plurality of annular protrusions', and the sealing is achieved by bringing these protrusions into elastic contact.

In FIG. 1, 76 is a lip-shaped sealing member attached to the plunger 22. Reference numeral 77 indicates a plurality of bolts provided for attaching the entire device 1 to the vehicle body. Further, a clutch wire is connected to the output member 42 at a portion not shown, so that the output member 42 is interlocked with a clutch operating arm of a clutch device not shown. 78 is a retaining ring.

The functions of the device 1 will be described below.

Assume that it is currently in an inactive state. Then, the casing 27 is moved to the right by the tension of the portion 28 of the valve spring 30 to the position where it abuts the block 44, and this causes the plunger 22 to move to the right via the stem 25 while overcoming the tension of the valve spring 30. It is seated on the valve member 33 and is moving.

At this time, since the valve seat 32 and the valve member 33 are separated and the valve Jw31 and the valve member 33 are seated, each chamber 15, 16 is isolated from the atmosphere and mutually After all, the same negative pressure is introduced into both chambers 15 and 16. Since there is no differential pressure between the two chambers 15 and 16, the movable body 14 moves to the right against the leftward biasing force that the hub portion 18 receives from the atmosphere due to the tension of the preload spring 67.
In this state where the front shell 3 and the diaphragm 9 are in contact with each other, it is assumed that a clutch pedal (not shown) is depressed in order to disconnect the clutch. Then, the input member 21 is pulled to the left, so the plunger 22 and the casing 27 overcome the tension of the portion 28 of the valve spring 30 and move to the left, and as a result, the valve member 33 moves to the left. Sitting on seat 32, both chambers 15.1
6 and the plunger 22 further moves, thereby separating the valve seat 31 from the valve member 33 and supplying atmospheric air to the variable pressure chamber 16.

This creates a pressure difference between the two chambers 15 and 16, and this pressure difference causes the movable body 14 to move to the left.

In this way, when the casing 27 moves to the left due to the pull of the input member 21 and the movable body 14 moves to the left due to the differential pressure, inside the casing 27, the movement of the casing 27 to the left occurs. Accordingly, the protrusion 41 is connected to the plate ring 4.
The cylindrical portion 45 of the flock 44 contacts the disk 39 through the cylindrical portion 44 and transmits the human force from the input member 21 to the disk 39, and the moving force of the movable body 14 is transmitted by the cylindrical portion 45 of the flock 44 coming into contact with the disk 39. .

The leftward acting force transmitted to the disk 39 is transmitted to the output member 42 via the plate ring 38 as a total output. When the clutch is disengaged by the output member 42 to which the output has been transmitted, the input from the input member 21 is kept at a constant value, in other words, the input member 2
1 to the left or by the desired distance,
The movement of the plunger 22 also stops, and the valve member 33 moves together with the movable body 14 and while seated on the valve seat 32 so as to approach relatively to the stopped plunger 22,
Finally, the valve member 33 is seated on both valve seats 32. As a result, the flow of air into the variable pressure chamber 16 is stopped, so the pressure within the variable pressure chamber 16 becomes constant, and therefore both chambers 15 and 16 are kept constant.
The differential pressure becomes constant. In this state, the sum of the human power from the input member 21 and the moving force of the movable body 14 is in balance with the output. In other words, due to the elastic deformation of the disk 39, a part of the output is balanced with the input, and the rest of the output is balanced with the moving force of the movable body 14, and furthermore, the input and the moving force are in a predetermined relationship. balance.

That is, the relationship between each acting force is as follows.

Assuming that the disk 39 is deformed uniformly, Fl/
Sz = F2 /S2 Since the sum of human power and moving power corresponds to the output, F3-(L
+SI/32) Fl However, Fl: Input from the input member 21 F2: Moving force of the movable body 14 F3: Output Sl of the output member 42: Elastic contact area S2 between the plate ring 40 and the disk 39: S2: The cylindrical portion 45 and Elastic contact area with the disk 39 Note that if the input force is large enough to keep the valve seat 31 and the valve member 33 apart, the moving force of the movable body 14 will be maximum, so the following relationship will be established. .

F3 = F1 + F2 max However, F2 max: Maximum moving force of the movable body 14 After this state, in order to connect the clutch, the input F is gradually increased.
As 1 is made smaller, in other words, as the crassotibetal is gradually returned, the input member 21 also moves to the right. As a result, the tension of the portion 28 of the valve spring 30 also acts, and the valve seat 32 and the valve member 33 are separated while the valve seat 31 and the valve member 33 are seated, and the atmosphere inside the variable pressure chamber 16 is released into the negative pressure chamber 15. The pressure difference between the two chambers 15 and 16 gradually decreases, and the pressure difference between the two chambers 15 and 16 finally returns to the non-operating position. The pressure disappears. At this time, the clutch device changes from a disconnected state to a half-clutch state to a fully connected state.

The effects of the device W1 having the above-mentioned functions will be described below.

■During operation, the disc 39 is connected to the plate ring 40 and the cylindrical part 4.
5 and the plate ring 38, and the output member 42 pulls the inner circumference of the disk 39 into the inner hole of the cylindrical portion 45 by frictional force. The inner peripheral portion of the disk 39, especially the portion facing the gap between the output member 42 and the cylindrical portion 45, tends to be eaten by the gap, but the reinforcing member 47 is arranged between the disk and the gap. Therefore, the disk 39 can be prevented from being eaten away and the durability of the disk 39 can be improved.

■Since the block 44 having the cylindrical portion 45 is supported by the stopper member 46 fitted to the hub portion 18, it is only necessary to simply insert the block 44 into the through hole 19. There is no need to form a screw on the inner surface of the through hole 19, and the shape can be simplified. Also, the stopper member 46 has claws 5 for attaching the boot 53.
2 is formed, one part exhibits multiple functions, and the overall structure can be simplified.

■ Even when the input member 21 swings in response to the depression of the pedal, the slide plate 70 slides on the bottom surface of the four parts 68, and this sliding can be easily performed due to the deformation of the communication portion 74 of the sealing member 71. This makes it possible to reliably prevent sealing failures in these parts.

■ Even if the negative pressure source fails, the plunger 22 engages with the step between the small diameter part 24 and the medium diameter part 23 of the through hole 19, and the input is directly transmitted, and this is applied to the stopper member 46, block 44, etc. to the disk 39 via the plunger 22 at the same time.
Due to the movement of the protrusion 41 of the casing 27, the plate ring 4
Since the human power is transmitted from the plate ring 40 to the disk 39 by contacting the disk 39 through the output member 40, the output member 42 is biased to the left in response to the input and can be operated.

Although the above-described embodiments have various effects, the present invention is not limited to the illustrated examples and can be implemented.

That is, although the annular groove 50 is formed in the hub part 18 as a cylindrical part, an example in which a large number of simple recesses are formed and the claws 51 are engaged with the recesses, or by utilizing the deformation of the claws, is possible. Examples include so-called bayonet coupling instead of fitting, and the shape and structure of other parts of the mounting H1 can be changed as necessary, and examples using positive pressure instead of negative pressure. Examples include using it for brakes, using a lever member instead of a rubber disc, and connecting an input member to a wire.

As is clear from the above, in the present invention, the moving force is transmitted to the output member by the support member fitted into the cylindrical part, which eliminates the need for thread machining and improves workability at each manufacturing stage. This makes it possible to improve production efficiency by improving production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a traction type booster which is an embodiment of the present invention. 1-Traction type booster 18-Hub portion 46-Stopper member 51-Claw

Claims (1)

[Claims] A movable body having a cylindrical part that is movably inserted into the main body and partitions a low pressure chamber on one side and a high pressure chamber on the other side and extends through the main body and extends to the other side, and one side of the cylindrical part. an input member extending from the main body to the outside of the main body; an output member extending from the other side of the cylindrical portion; and a valve device for controlling to generate a differential pressure that biases the movable body toward one side, and transmits the moving force of the movable body to the output member via the cylindrical portion. , a support member is disposed at the other end of the cylindrical portion, the support member has a tip shape, has a hole through which the output member passes through at the bottom, and has a protrusion on the side that engages with the other end; A tractable booster that transmits output via a support member.