JPS5992220A - Towing type booster - Google Patents

Abstract

PURPOSE:To improve the responsiveness of operation by forming a projection capable of being contacted with a body at an input member. CONSTITUTION:Since a valve member 33 is seated on both valve seats 31, 32 at nonoperation time, the member 33 and the valve seat 31 are separated immediately in response to the leftward movement of an input member 21 to introduce atmospheric air. Accordingly, no reactive stroke exists. Since the valve seat 32 and the valve member 33 are separated by the operation of a valve spring 30 when returning from the operation state to the nonoperation state even if the valve seat 31 and the valve member 33 are seated, no differential pressure is generated to move a movable unit 14 to both pressure chambers 15, 16. Since a stopper member 75 is engaged with the input member 21 and a threaded part 74 is formed relatively long in length, the position of a stopper member 75 can be readily controlled, and can be accurately adjusted without influence of the error of the components.

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 movable body which is movably inserted into the internal space of the main body with a low pressure chamber on one side and a high pressure chamber on the other side, and a human power member extending to the outside of the main body; an output member extending from the other side of the movable body to the outside of the main body; and a manpower member disposed between the output member and the input member, and in response to input from the input member, the low pressure chamber and a valve device that controls the high pressure chamber to generate a differential pressure that biases the movable body toward the one side. That is, when an input in the pulling direction is applied to the human-powered member, the above-mentioned differential pressure is generated by the operation of the valve device, and this differential pressure generates a moving force in the movable body from the output member side to the input member side. This moving force is used to pull the output member toward the input member, in other words, it is towed.In particular, it is used not only for various devices such as wire-type clutch actuators, wire-type brakes, or accelerators, but also for , is suitable for a device in which the input acts on the input member in a direction away from the output member. However, when a valve device is actuated in response to an input from an input member, regardless of the type of valve device, there is a so-called play before switching to the point where a differential pressure is generated. Since there is an invalid stroke, a wasted operation occurs between the time when an input is applied and the time when an effective operation actually starts, and the responsiveness of the operation is poor, making it impossible to perform a quick operation.

The present invention was made in view of the problem of tilting, and an object of the present invention is to provide a tow type booster capable of improving responsiveness. The protruding portion is provided with a protrusion that can come into contact with the main body. That is, the valve device changes from a state in which the low pressure chamber and a high pressure chamber are at the same pressure (inoperative position) to a state in which communication between both pressure chambers is cut off and pressure is supplied to one pressure chamber (inactive position). Focusing on the fact that when operating to the position), the valve device operates through a so-called balanced state in which communication between both pressure chambers is cut off and communication between one pressure chamber and the pressure source is cut off. By bringing the valve into a state closer to a balanced state, the invalid stroke can be reduced.Furthermore, since the valve device operates in response to the input member, it is only necessary to define the return position or center position of the input member. By forming a protrusion on the human-powered member that can come into contact with the main body as described above, the intended purpose can be achieved. In addition, by making it possible to attach the protrusion to any position on the input member, it is possible to reduce the invalid stroke to an allowable stroke, and even if there are manufacturing errors at the production stage, the original function can be maintained. Each individual device can be adjusted without disturbing the system.

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.

A hub portion 18 that slidably fits into the opening F of the front shell 3 is integrally molded in the center of the movable body 14, and a stepped portion is formed in the axial direction of the movable body 14 including the hub portion I8. A through hole 19 is provided.

An input member 21 is fitted into the left end of the through hole 19, and has a clevis 2o screwed thereon that extends through the rear shell 2 and has an external end connected to a clutch pedal (not shown).
A plunger 2' that is swingably connected to this input member 21
2f is a medium diameter portion 23 and a small diameter portion 2 on the left side of the through hole 19.
4 in a slidable manner.

On the right side of the plunger 22, a relatively long and small-diameter stem 25 that extends rightward is integrally provided. The casing 27 is slidably fitted through the hole 27a. Such a casing 27 and plunger 2
2, there is a valve spring 3o integrally formed with a conical coil spring portion 28 and a cylindrical coil spring portion 29, a valve seat 31 formed on the plunger 22 by the valve spring 3o, and an inner wall of the through hole I9. A valve member 33 made of rubber is disposed and is biased to be seated on a valve seat 32 formed in the valve seat 32 . The right end of the conical coil spring portion 2 of the valve spring 3o is supported by the casing 27, and the left end of this portion 28 is adapted to press the right end of the poppet-shaped valve member 33 toward the step 34 of the through hole 19. It is being done. The cylindrical coil spring portion 29 is also adapted to press the left end seat portion 35 of the valve member 33 towards each valve seat 31,32. 3
6.37 is a spring receiver.

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, 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 disk 39. This block 44 can be connected to the hub portion 18.
It is supported by a stopper member 46 fitted to the outer periphery of the end portion. A plate ring-shaped reinforcing member 47 having an inner hole approximately equal to the outer diameter of the output member 42 is integrally arranged in a part of the disk 39 facing the gap between the cylindrical portion 45 and the output member 42. Further, 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 gap between the cylindrical part 45 and the output member 42 and the disc 3
It has a sufficient size so that it does not directly face 9. The stopper member 46 has a substantially tip shape, and is suitable for Glock 4.
4, and a cylindrical portion 49 that fits onto the hub portion 18. The cylindrical portion 49 has a number of claws that can engage with grooves 50 formed on the outer periphery of the hub portion 18. 51 and a number of claws 52 extending radially outward.

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 seat/socket member 46. Further, a cup-shaped housing portion 55 is integrally formed on the right side of the annular portion 54 of the boot 53.
A plurality of filters 56 are inserted between the housing 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 holes 62 formed on the side periphery of the block 44 and a large number of holes 63 formed on the side periphery of the stopper member 4G.
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 I8.
communicates with the space around the plunger 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, the negative pressure chamber ■
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.

Between the input member 21 and the rear shell 2, the rear shell 2
A sealed bag W69 is disposed within the four parts 68 of the bag.

This sealing device 69 consists of a ring-shaped synthetic resin slide plate 70 that fits into the input member 21 with almost no gaps, a rubber sealing member 71 that covers the entire left side of the slide plate 70, and a rubber sealing member 71 that covers the entire left side of the slide plate 70. The member 71 has a slide plate 72 made of synthetic resin and has an angular cross-section and is located on the outer periphery of the left end of the member 71. Each of these members is integrally molded, and is rotated in the axial direction by a presser foot 73 with a claw press-fitted into the recess 68. It is placed in such a way that the transition is prevented. One slide plate 70 is configured to be slidable on the bottom surface of the recess 68 and the outer periphery of the input member 21, and the other slide plate 72 is configured to be slidable on the presser foot 73, and is sealed. The device 69 is entirely movable in the radial direction. Further, the sealing member 71 has a substantially crank-shaped cross section, and a portion located on the outer peripheral side of the slide plate 70 is in tight elastic contact with the bottom surface of the recess 68, and a portion located on the inner peripheral side of the slide plate 72 is in tight elastic contact with the bottom surface of the recess 68. The lip part that is located is
The input member 21 is in close elastic contact with the input member 21, and the elastic contact portion of each of these parts is formed with - or a plurality of protrusions (not shown), and these protrusions are particularly designed to perform sealing. ing.

A threaded portion 74 is formed relatively long on the clevis 20 side of the input member 21, and a stopper member 75 is screwed onto this threaded portion 74 and is prevented from rotating by a nut 76. .

The stopper member 76 has a cylindrical portion 77 in which a ridge is formed, and a plate ring-shaped protrusion portion 78 that extends radially from the right end of the cylindrical portion 77 and can come into contact with the main body 4 .

Additionally, in FIG. 1, reference numeral 79 indicates a lip-type sealing member attached to the plunger 22, and reference numeral 80 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 flannel device not shown. 81 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 input member 21 is biased to the right via the casing 27 by the tension of the portion 28 of the valve spring 30, and is in the illustrated position where it abuts against the main body 4 via the seat member 75. At this time, the valve member 3
3 is seated on both valve seats 31, 32, while the disc 79 is in light elastic contact with the cylindrical portion 45 and the plate ring 40. In this state, equal negative pressure is supplied to the pressure chambers 15 and 16 as will be described later, so the movable body I4 is in a position where it comes into contact with the main body 4 due to the biasing force of the preload spring 67.

Suppose that in this state, 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 by overcoming the tension of the portion 28 of the valve spring 30, and as a result, the valve member 33 is released from the valve seat 31 of the plunger 22 while being pressed against the valve seat 32 of the hub portion 18. He leaves the seat and supplies popularity to the transformation room 16.

This causes 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, due to the leftward movement of the casing 27, , the protrusion 41 is the plate ring 4
0, and transmits the input from the input 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 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 human power from the human power member 21 is kept at a constant value, in other words, the input member 2
When 1 is moved to the left 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 input from the human power 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/
S+ = F2 /32 Since the sum of human power and moving power corresponds to the output, F3-(1
+SI/S2) Fl However, Fl: Input from the human-powered member 21 F2: Moving force F3 of the movable body 14 = Output Sl of the output member 42: Elastic contact area between the plate ring 40 and the disk 39 S2: The cylindrical portion 45 and Elastic contact area with the disk 39 Note that in the case of a large amount of human power that causes the valve seat 31 and the valve member 33 to remain apart, the moving force of the movable body 14 will be at its maximum, so the relationship will be as follows. .

F3 = F+ 1 F2 max However, F2max: Maximum moving force of the movable body 14 After this state, in order to connect the clutch, the input F+ is gradually reduced.In other words, when the thalassodie pedal is gradually returned. , the input member 21 also moves to the right. This also causes tension in the portion 28 of the valve spring 30 to act on the valve seat 3.
1 and the valve member 33 are seated, the valve seat 32 and the valve member 33
The air inside the variable pressure chamber 16 moves toward the negative pressure chamber 15, and the pressure difference between the two chambers 15.16 gradually decreases until the pressure difference between the two chambers 15.16 disappears. At this time, input member 2
1 moves rightward until it abuts the main body 4 via the stopper member 75, while the movable body 14 moves rightward until it directly abuts the main body 4, returning to the above-mentioned non-operating state. Furthermore, the clutch device changes from a disconnected state to a half-clutch state to a fully connected state.

According to the above-described embodiment, the following effects can be achieved.

■Since the valve member 33 is seated on both valve seats 31 and 32 when not in operation, the valve member 33 and the valve seat 31 are immediately separated in response to the leftward movement of the input member 21, and the atmosphere is released. Since it is introduced, there are no invalid strokes.

■Even if the valve seat 31 and the valve member 33 are seated in the non-operating state, when returning from the operating state to the non-operating state, the valve spring 30
Since the valve seat 32 and the valve member 33 are separated from each other by the action of , no pressure difference is generated that would cause the movable body to move into the circular pressure chambers 15 and 16. Even if this happens, the movable body 14 will try to move to the left while the plunger 22 remains in the same position, so the valve member 33 will separate from the valve seat 32 and the differential pressure will be eliminated.

■Since the store 8 member 75 is screwed onto the input member 21, and the threaded portion 74 is formed relatively long, it is easy to adjust the position of the stopper member 75, and it can be manufactured into parts. Even if there is an error, it can be adjusted accurately without being affected by the error.

As is clear from the above description, various effects can be obtained according to the embodiments described above, but the present invention is not limited to the illustrated embodiments and can be implemented in various forms.

That is, instead of using negative pressure and atmospheric pressure as pressure sources, examples of using negative pressure and positive pressure or atmospheric pressure and positive pressure,
For differential pressure generation, a constant pressure is maintained in both the low pressure chamber and the high pressure chamber, and instead of supplying pressure to the high pressure chamber during operation, low pressure is supplied to the low pressure chamber during operation, for example, changing the valve device to a poppet type. Examples include a plunger type, an example in which a protrusion is formed integrally with the input member, an example in which the input member is connected to a wire, etc. Also, the shape and structure of each part inside the device can be changed arbitrarily. . In short, in the present invention, the valve can be switched so as to control communication and isolation of both chambers (low pressure chamber and high pressure chamber), a pressure source, and a pressure release source in accordance with the input member's movement. By regulating the return position of the input member, the device is held in a position that reduces the invalid stroke, thereby eliminating part or all of the invalid stroke that occurs at the beginning of actual operation, and improving responsiveness. It enhances the

As is clear from the above description, according to the present invention, a traction type booster capable of improving responsiveness can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a traction type booster which is an embodiment of the present invention. ■-Traction type booster 4-Main body 21-Manpower member 75-
Stopper member

Claims (1)

[Claims] A movable body movably inserted into an internal space of a main body with a low pressure chamber on one side and a high pressure chamber on the other side, an input member extending from one side of the movable body to the outside of the main body, and the other side of the movable body. an output member extending from the side to the outside of the main body; and an output member disposed between the output member and the input member, the movable body being moved to the one side in the low pressure chamber and the high pressure chamber in response to an input from the input member. In the traction type booster equipped with a valve device that controls to generate an energizing differential pressure, a projecting portion of the input member protruding to the outside of the main body is provided with a protrusion that can come into contact with the main body. A towed booster consisting of.