JPS638064A - Pull type booster device - Google Patents

Abstract

PURPOSE:To improve the operating efficiency of a device by providing an outwardly projecting cylindrical part through a body on the low pressure chamber side of a movable body, and enabling said movable body normally to be energized to a nonoperating position even when the energizing force of a return spring is reduced. CONSTITUTION:A cylindrical part 18 over which the opening part 17 of a front shell 3 is slidably fitted and a cylindrical part 1 over which the opening part 20 of a rear shell 2 is slidably fitted, are molded in an integrated form respectively with the center part of a movable body 14, and a stepped through hole 19 is provided in the axial direction of the movable body 14 including the cylindrical parts 18 and 11. When a casing 27 is moved leftward being pulled by an input member 21 and as the movable body 14 is moved leftward due to a differential pressure, in the casing 27, a projection 41 is brought into contact with a disk 39 via a plate ring 20 transmitting the input from the input member 21 to the disk 39, while the moving force of the movable body 14 is transmitted, with the cylindrical part 45 of a block 44 being brought into contact with the disk 39.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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.

(Prior Art) The present applicant has previously proposed a body of this kind, for example, as shown in Japanese Utility Model Application Publication No. 59-147661, which includes a main body having an internal space formed therein, and a main body movably disposed in the internal space. a movable body that partitions a low pressure chamber on one side and a high pressure chamber on the other side; a cylindrical portion extending from the movable body to the other side and movably fitting the main body; the cylindrical portion and the movable body; an input member that fits into one side of the cough hole and projects outwardly through the low pressure chamber and the main body; and an input member that is disposed within the hole and receives input from the human power member. a valve device that operates to generate a pressure difference between the high-pressure chamber and the low-pressure chamber to move the movable body toward the low-pressure chamber; and an output transmission device that transmits the moving force of the movable body to the output member. We are proposing something that has the following.

In these devices, an engine or a negative pressure pump is used as an external pressure source, and in order to improve operational response, the same negative pressure is supplied to the low pressure chamber and the high pressure chamber, and the valve device is supplied through the cylindrical part during operation. Atmospheric air is supplied to the hyperbaric chamber from the

(Problems to be Solved by the Invention) In the conventional device described above, the same negative pressure is supplied to the low pressure chamber and the high pressure chamber, and the cylindrical portion is moved to the main body so that the cylindrical portion protrudes from the main body to the outside. Since the movable body faces the low pressure chamber and the high pressure chamber and receives negative pressure,
The movable body is exposed to the atmosphere through the cylindrical part, and the movable body is forced to return to the inoperative position against the urging force due to the working pressure of the negative pressure received in the low pressure chamber and the atmospheric pressure received in the cylindrical part. It is necessary to install a return spring with a large force.

Therefore, during actual operation of the device, the output corresponding to the biasing force of the return spring is wasted, resulting in a problem that the operating efficiency is reduced.

An object of the present invention is to provide a traction type booster capable of improving operating efficiency.

(Means of the Invention) In order to achieve the above object, the present invention includes a cylindrical portion that penetrates the main body and projects to the outside on the low-pressure chamber side of the movable body.

(Function of means) In the present invention, the cylindrical portion on the high pressure chamber side receives atmospheric pressure toward the low pressure chamber side, and the cylindrical portion of the low pressure chamber receives atmospheric pressure toward the high pressure chamber side, and the biasing force between them is reduced. act in opposition.

(Effects of the Invention) According to the present invention, the cylindrical portion on the low pressure chamber side generates a biasing force due to atmospheric pressure in opposition to the biasing force generated when the cylindrical portion on the high pressure chamber side receives atmospheric pressure. Even if the biasing force of the return spring is reduced, the movable body can still be biased to the normally inactive position, and the reduction in the biasing force of the return spring improves the operating efficiency of the device.

Since the cylinder portion of the movable body is movably fitted to the main body on the high-pressure chamber side and the low-pressure chamber side, the movable body can be moved smoothly due to the large guide interval when moving the movable body.

(Example) FIG. 1 is a side sectional view of a traction type booster which is an example 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.
It has a main body 4 which is formed by joining the two together, and a space 5 is formed within the main body 4.

While compressing the outer bead 10 of the diaphragm 9 between the stepped portion 6 of the rear shell 2 and the flange 7 and cylindrical portion 8 of the front shell 3, the flange 7 of the front shell 3 is engaged with a projection (not shown) of the rear shell 2. Both shells 2.3 are joined together.

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 flexible tl 14.
A cylindrical portion 18 that slidably fits into the opening 20 of the rear shell 2 and a cylindrical portion 11 that slidably fits into the opening 20 of the rear shell 2 are molded as one body. A stepped through-hole 19 is bored in the axial direction of 14.

A joint 21b that is fixed to the end of a wire 21a that extends through the rear shell 2 coaxially with the cylindrical portion 11 and constitutes the input member 21 together with the wire 21a is fitted into the center of the through hole 19, and the joint 21b is a manpower member. 21 and a plunger 22 slidably connected to the medium diameter portion 23 and the small diameter portion 2 of the through-hole drill 9.
4 in a slidable manner.

The plunger 22 and the input member 21 are elastic members fitted between a spherical head 70 of the joint 21b of the input member 21 and an annular flange 71 formed at a distance slightly to the left of the spherical head 70. It is prevented from coming off by a deformable C-shaped retaining ring 72, and this retaining ring 72 has a spherical head 7
o and the flange 71, and the spherical head 7
0 toward the recess 73 of the plunger 22, when it comes into contact with the first cone 74 of the recess 73, the flange 7
1, it is deformed in the radial direction, and when it is fitted beyond the first conical part 74, it is restored and deformed by passing over the stepped part 76 between it and the second conical part 75. ,
By engaging the spherical head 70 and the stepped portion 76 with the retaining ring 72 interposed, communication between the two is achieved and maintained. Note that the end portion of the wire 77 is fixed to a support 78 fixed to the guide body A of the wire 21a.
1a is connected to a clutch pedal (not shown).

On the right side of the plunger 22, a relatively long small-diameter stem 25 extending toward the right is integrally provided, and a comb-shaped casing 27 is engageable with a head 26 formed at the end of the stem 25. It is a slidable fit located inside. The head 26 is formed into a hemispherical shape, and the center portion of the left end of the casing 27 that comes into contact with the head 26 has a spherical portion 2 forming a spherical recess corresponding to the head 26.
7b, and the spherical surfaces are joined together so that they can swing together. 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 supported by the casing 27, and the left end of this portion 28 is adapted to press the right end of the Bopeft-type valve member 33 toward the step 34 of the through hole 19. has been done. Further, the cylindrical coil spring portion 29 is configured to press the seat portion 35 at the left end of the valve member 33 toward each of the valve seats 31 and 32.

36 and 37 are spring receivers.

Inside the casing 27, plate rings 3 are installed in order from the left side.
8. A rubber disk 39 and a temporary 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 penetrating each member disposed inside these casings 27, and a head 43 formed at the left end of the output member 42 makes spherical contact with the temporary ring 38. It is like that.

Between the outer periphery of the output member 42 and the temporary ring 40, a cylindrical portion 45 of a synthetic resin block 44 fitted into the opening of the through hole 19 is movably fitted and abuts against the right end surface of the disc 39. This block 44 can be connected to the through hole 1.
It is held and supported by a stopper 46 fitted into a groove 48 formed in the inner periphery near the right opening end of 9, and the stopper 46 is made of wire and has an annular C-shape. Note that 49 is a hole for removing the stopper 46 formed in communication with the hole 48.

An auxiliary tool 50 for the cylindrical portion is press-fitted into the inner periphery of the right end of the cylindrical portion 45 of the block 44, and a flange portion 51 formed at the right end of the auxiliary tool 50 covers the entire cylindrical portion 18. The annular portion 54 of the boot 53 thus arranged is fitted and held. A bent portion formed on the outer circumferential side of the annular portion 54 of the boot 53 has a ventilation hole 52 formed therein, and a filter 56 is placed between the block 44 and the end of the cylindrical portion 18 with pressure therebetween. A housing section 55 is used for the purpose. A retractable bellows portion 57 is integrally provided on the left side of the accommodation portion 55, and a retainer 58 is provided at the left end of the bellows portion 57 between the cylindrical portion 18 and the opening 17 of the front shell 3. A lip-shaped seal portion 59 that is applied and fitted 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 cylindrical portion 18 communicates with the atmosphere through the filter 24 disposed on the left side of the block 44, a large number of holes 4443 formed on the side periphery of the block 44, the filter 56, and the holes in the boot 53. ing. Further, the variable pressure chamber 16 communicates with the space around the plunger 22 through a hole 64 provided along the radial direction of the cylindrical portion 18, and the negative pressure chamber 15 communicates with the space around the plunger 22.
A hole 65 extending along the axial direction communicates with the space around the valve member 33 . The negative pressure chamber 15 is connected to an I pressure source (
It is connected to the engine's intake manifold, vacuum pump, etc.).

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

The cylindrical portion 11 of the movable body 14 and the opening 2 of the front shell 2
A lip type seal 81 is fitted between the bank 0 and the bank upper 80, and is prevented from being removed by a retainer 79 and supported by an upper bank 80.

In addition, in FIG. 1, 82 indicates a lip-type sealing member attached to the plunger 22, 83 indicates a plurality of bolts provided for attaching the entire device 1 to the vehicle body, and the device l indicates a nut (not shown). It is attached to the vehicle body A by screwing onto a bolt 83 with a support 84 interposed therebetween. Further, a clutch wire (not shown) is connected to the output member 42 so that the output member 42 is interlocked with a clutch operating arm of a clutch device (not shown).

The operation of such a device 1 will be described below.

Assume that it is currently in an inactive state. Then, the casing 27 is moved to the right to the position where it abuts the block 44 due to the tension in the portion 28 of the valve spring 30, and the plunger 22 is thereby moved to the right via the stem 25 due to the tension in the portion 29 of the valve spring 30. The valve member 33 is seated on the valve member 33 and moves while overcoming the pressure. At this time, the valve member 33 is connected to the valve seat 32 and the valve member 3
3 are separated and the valve seat 31 and valve member 33 are seated, each chamber 15.16 is isolated from the atmosphere and communicates with each other, resulting in an equal negative pressure is introduced. Since there is no differential pressure between compartments 15 and 16,
The movable body 14 is moved by the tension of the preload spring 67 to the cylindrical portion 18.
moves to the right against the biasing force that is obtained by subtracting the rightward biasing force that the cylinder part 11 receives from the atmosphere from the leftward biasing force that it receives from the atmosphere, and moves to the right through the front shell 3 and the diaphragm 9. located in close proximity.

In this state, assume that the clutch pedal (not shown) is depressed in order to disengage the clutch. Then, the input member 21 is pulled to the left, so the plunger 2
2 and the casing 27 move to the left overcoming the tension in the portion 28 of the valve spring 30, so that the valve member 33 seats on the valve seat 32 of the barrel 18 and interrupts the communication of the compartments 15, 16. At the same time, as the plunger 22 moves further, the valve seat 31 separates from the valve member 33 and the atmosphere is supplied to the variable pressure chamber 16.

This creates a pressure difference in the compartments 15, 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, due to the leftward movement of the casing 27, , the protrusion 41 is the temporary ring 4
0, and transmits the input from the human power member 21 to the disc 39, and the moving force of the movable body 14 is transmitted by the cylindrical portion 45 of the block 44 contacting the disc 39. .

The leftward acting force transmitted to the disk 39 is
The total output is transmitted to the output member 42 via the plate ring 38. The clutch is disengaged by the output section 42 to which the output is transmitted.

At this time, if the input from the input member 21 is kept at a constant value, in other words, if the input member 21 is moved to the left by the desired distance, the movement of the plunger 22 is also stopped, and this The valve member 33 is moved together with the movable body 14 and the valve seat 3 so that it approaches relatively to the stopped plunger 22.
The valve member 33 moves while seated on both valve seats 32, and finally the valve member 33 is seated on both valve seats 32. As a result, the inflow of atmospheric air into the variable pressure chamber 16 is stopped, so the pressure within the variable pressure chamber 16 becomes constant, and therefore the differential pressure in the compartments 15 and 16 becomes constant. In this state, the sum of the input 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.

After this state, when the human power is gradually reduced to connect the clutch, in other words, when the clutch pedal is gradually released, 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 3 remain seated.
3 is separated, the atmosphere in the variable pressure chamber 16 moves toward the negative pressure chamber 15, and the differential pressure between the compartments 15 and 16 gradually decreases, eventually returning to the non-operating position, and the atmosphere in the variable pressure chamber 16 becomes sufficient. The pressure difference between compartments 15 and 16 is eliminated by suction by the negative pressure source. 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 1 having the above functions will be described below.

(2) Since the movable body 14 normally receives atmospheric pressure on the cylindrical portions 11 and 18 facing each other, in the above embodiment, the cross-sectional area of the cylindrical portion 11 (the sealing area by the lip seal 81) Since the cross-sectional area (area) is made slightly smaller than the cross-sectional area of the cylindrical portion 18 (the sealed cross-sectional area by the seal portion 59), the urging force that tends to move the movable body 14 to the left in response to atmospheric pressure is It can be made smaller than the conventional one without the cylindrical part 11, and therefore the rightward biasing force of the preload spring 67 as a return spring can be made smaller than the conventional one, improving operating efficiency.

■The input member 21 can be connected to the plunger 22 through the cylindrical portion 11, and in the example shown, it can be connected with one touch, making the connection work extremely easy, and the connection work can be performed not only at the manufacturing stage of the device 1 but also at the manufacturing stage of the device 1. , it can be installed on an actual vehicle at any time or at any time.

■The cylindrical part 11 is connected to the front shell 2 by means of a rear flap 80, and the cylindrical part 18 is connected to the rear shell 3 by means of a sliding ring 61.
Since the sliding movement is guided by each of the movable body 14, even if an unnecessary external force is applied from the human power member 21 or the output member 42, the movement of the movable body 14 can be performed with sufficient stability, improving operability.

As described above, although various effective effects are achieved according to the embodiments described above, the present invention is not limited to the illustrated examples and can be practiced. That is, for example, if the cross-sectional area of the cylinder part 11 and the cylinder part 18 are made equal, in this example, if the cross-sectional area of the cylinder part 11 is made slightly larger than that of the cylinder part 18, a biasing force to the right will be generated. If this biasing force is sufficient to return the movable body 14 to the inoperative position, the return spring may be omitted. Furthermore, although the example in which only one cylindrical portion 11 was provided was shown,
It is also possible to provide a plurality of them.

[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 booster 4-Main body 11-Cylinder part 14-Movable body 15-Negative pressure chamber

Claims (1)

[Claims] A main body forming an internal space, a movable body movably disposed in the internal space to partition a low pressure chamber on one side and a high pressure chamber on the other side, and a movable body extending from the movable body to the other side and defining the main body. A cylindrical portion movably fitted, a hole formed through the cylindrical portion and the movable body, and a cylindrical portion fitted into one side of the hole and protruding outward through the low pressure chamber and the main body. an input member, an output member that fits into the other side of the hole, and an output member that is arranged in the hole and moves the movable body to the high pressure chamber and the low pressure chamber in response to input from the input member; In the traction type booster comprising a valve device that operates to generate a differential pressure to be moved, and an output transmission device that transmits the moving force of the movable body to the output member, the A towable booster equipped with a cylindrical part that penetrates the main body and protrudes to the outside.