JPS632826B2 - - Google Patents

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 an input 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 an input member disposed between the output member and the input member, and responsive to input from the input member of the input member. a valve device that controls the low-pressure chamber and the high-pressure chamber to generate a differential pressure that urges the movable body toward the one side; and an output member that calculates the sum of the input of the input member and the moving force of the movable body. a transmission mechanism for transmitting a signal to the input member; the transmission mechanism includes a pot-shaped casing that is connected to the input member and has an opening on the other side; a rubber disk disposed inside the casing; and a rubber disk disposed inside the casing of the disk. a plate member arranged adjacently and in surface contact with the disk; a protrusion provided on the casing capable of transmitting the input to the disk; and a protrusion fitted on the inner peripheral side of the protrusion to transfer the moving force of the movable body to the disk. a cylindrical portion capable of being transmitted to the disk, the output member extending through the disk and the cylindrical portion into the casing, and engaging the plate member;
It is proposed that the summation is obtained from the disk.

However, since the output member is disposed so as to pass through the disk and the cylindrical portion, a portion of the disk may come into contact with the output member and the cylindrical portion due to deformation of the disk and friction with the output member during operation. There is a problem that it can get into the gap between the two and cause damage.

Although this problem can be solved by reducing the gap, this type of output member is connected to the lever of the clutch device through, for example, a wire, which allows the output member to swing during operation. If this is not done, there is a problem that excessive stress will be applied to extremely localized parts, resulting in damage.In order to allow the output member to swing, a sufficient space must be formed between the output member and the cylindrical part. There is a need. Therefore, the gap must be made relatively large to allow rocking, which further exacerbates the problem. If such a gap is not formed between the output member and the cylindrical part, the output member will swing around the contact point between the cylindrical part and the output member, and the end of the output member will swing inside the casing. In this case, a large unbalanced load acts on the engagement portion between the output member and the temporary member, causing problems such as the casing being twisted and the valve malfunctioning.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a towable booster that allows swinging of the output member while preventing damage to the disk. Preferably, the disk-side end surface of the cylindrical portion is flat, and an annular reinforcing member is disposed at the center portion of the other side of the disk to fit into the output member and to extend along the end surface of the cylindrical portion. This is what I did.

As a result, the present invention has the following effects.

Even if a relatively large gap is formed between the output member and the cylindrical portion, the reinforcing member prevents a portion of the disk from deforming and entering the gap, thereby preventing damage to the disk.

When the output member swings, the reinforcing member can move along the end face of the cylindrical part, so the output member does not swing around this, but swings around the engagement part with the plate member. Even when the total output is transmitted from the disk to the output member via the plate member, a large unbalanced load does not act on the end of the output member on the plate member side. Therefore, it is possible to prevent an adverse effect on the casing or the valve device, and prevent malfunction.

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 towed booster has a total of 1
It has a main body 4 formed by joining together a pot-shaped rear shell 2 and a dish-shaped front shell 3, and a space 5 is formed in the main body 4.

While compressing the outer peripheral 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 the protrusion 11 of the rear shell 2. In this way, both shells 2 and 3 are connected.

A dish-shaped synthetic resin movable body 14 in which the inner peripheral 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. Transformer room 1 on 3 side
6 are each divided into sections.

A hub portion 18 that slidably fits into the opening 17 of the front shell 3 is integrally molded in the center of the movable body 14, and the movable body 14 including the hub portion 18
A stepped through hole 19 is bored in the axial direction.

Fitted into the left end of the through hole 19 is an input member 21 which extends through the rear shell 2 and has a clevis 20 screwed onto the outer end of which is connected to a clutch pedal (not shown). A plunger 22 slidably connected to the member 21 is slidably fitted into a medium diameter portion 23 and a small diameter portion 24 on the left side of the through hole 19 .

On the right side of the plunger 22, a relatively long and small diameter stem 25 that extends toward the right is integrally provided, and a head 26 formed at the end of the stem 25 is provided.
A top-shaped casing 27 that can be engaged with the head 26 is slidably fitted into the casing 27 by positioning the head 26 inside the casing 27 through a hole 27a. Between the casing 27 and the main body 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 biased 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 supported by the poppet-shaped valve member 3.
3 is pressed against the stepped portion 34 of the through hole 19. 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, in order from the left side, a plate ring 38, a rubber disk 39, and a plate ring 4 are installed.
0 are movably inserted in order, and are prevented from coming out by a plurality of protrusions 41 formed on the right end of the casing 27. One end of the output member 42 is fitted into the casing 27 by passing through each member disposed inside the casing 27, and the output member 42 is fitted into the casing 27.
A head 43 formed at the left end of the plate ring 38 is in spherical contact with the plate ring 38.

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 flattened against the right end surface of the disk 39. The block 44 is able to come into contact with it via a support surface, and is supported by a stopper member 46 fitted to the outer periphery of the end of the hub portion 18. A plate ring-shaped reinforcing member 47 having an inner hole approximately equal to the outer diameter of the output member 42 is integrally provided in a part of the disk 39 facing the gap between the cylindrical portion 45 and the output member 42. A reinforcing member 47 is arranged along the end surface of the cylindrical part 45.
The outer diameter of the output member 42 is larger than that of the inner hole at the left end of the cylindrical portion 45.
The gap between the disk 39 and the disk 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 claws 51 that can be engaged with the grooves 50
and a large 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 stopper member 46. More boots 5
A cup-shaped accommodating portion 55 is integrally formed on the right side of the annular portion 54 of No. 3, and a plurality of filters 5 are disposed between the accommodating portion 55 and the stopper member 46.
6 has been inserted. Further, a retractable bellows portion 57 is integrally provided on the left side of the annular portion 54 of the boot 53, and a hub portion 18 is provided at the left end of the bellows portion 57.
A lip-shaped seal portion 5 is fitted with a retainer 58 between the front shell 3 and the opening 17 of the front shell 3.
9 is provided integrally. A sliding ring 61 is disposed on the left side of the seal portion 59 and is prevented from coming off by a retaining ring 60.

The through hole 19 of the hub portion 18 is connected to a large number of grooves 62 formed on the side periphery of the block 44 and the stopper member 46.
A large number of holes 63 are formed in the side circumference of the filter 56 and the boot 53 allows communication with the atmosphere through the holes in the filter 56 and the boot 53. Furthermore, the variable pressure chamber 16 communicates with the space around the plunger 22 through a hole 64 provided along the radial direction of the hub portion 18, and the negative pressure chamber 15 communicates with the space around the plunger 22 through a hole 65 extending along the axial direction. It communicates with the space around the member 33. The negative pressure chamber 15 is connected to a negative pressure source (engine intake manifold, vacuum pump, etc.) through a connector 66 welded near a corner of the rear shell 2.

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

A sealing device 69 is disposed between the input member 21 and the rear shell 2 and is located within the recess 68 of the rear shell 2. This sealing device 69 is connected to the input member 2
1, and a rubber sealing member 71 that covers the entire left side of the slide plate 70. combined and integrated. The slide plate 70 is slidable on the bottom surface of the recess 68 and on the input member 21,
The sealing member 71 has a lip portion 72 in elastic contact with the input member 21 at its inner peripheral end, and a fixing portion 73 with a mandrel 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. The connecting portion 74 is prevented from coming off, and the outer peripheral side portion of the connecting portion 74 is held down.

Furthermore, a second lip portion 72a that fits on the outer periphery of the slide plate 70 is in close elastic contact with the bottom surface of the recess 68 in a slidable manner, and is also in close elastic contact with the fixing portion 73 and the lip portion 7.
The space 68a between the opening and the opening 2a communicates with the outside air through a small hole 74a formed in the communication 74 and having a relatively small passage surface. In addition, each lip portion 72, 72
A is formed with a plurality of annular protrusions, and the protrusions are brought into elastic contact to achieve a seal.

Additionally, in FIG. 1, 76 is a lip-type 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, the output member 42 is connected to a clutch wire at a portion (not shown) so as to be 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 against the block 44, and as a result, the plunger 22 is moved to the right via the slam 25 by the tension of the valve spring 30. It is sitting on the valve member 33 and moving while winning. At this time, since the valve seat 32 and the valve member 33 are separated and the valve seat 31 and the valve member 33 are seated, each chamber 15, 16 is isolated from the atmosphere and mutually As a result, the same negative pressure is introduced into both chambers 15 and 16. Since there is no pressure difference 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, and the front ciel 3
and are in contact with each other with the diaphragm 9 interposed therebetween.

Suppose that in this state, 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
The valve spring 30 overcomes the tension of the portion 28 and moves to the left, and as a result, the valve member 33 seats on the valve seat 32 of the hub portion 18, cutting off communication between the chambers 15 and 16, and the plunger 22 is moved to the left. By further moving, the valve seat 31 separates from the valve member 33 and the atmosphere is supplied to the variable pressure chamber 16.

This causes a pressure difference between the 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 traction of the input member 21 and the movable body 14 moves to the left due to the differential pressure, the casing 27
Inside, as the casing 27 moves to the left, the protrusion 41 comes into contact with the disk 39 via the plate ring 40, transmitting the input from the input member 21 to the disk 39, and also transmits the input from the input member 21 to the movable body 14. The moving force is transmitted by the cylindrical portion 45 of the block 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. The clutch is disconnected by the output member 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 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, and finally the valve member 33 moves toward both valve seats 32.
sit down. 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 the differential pressure between the two chambers 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. balance in relation to

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

Assuming that the disk 39 is deformed uniformly, F ₁ /S ₁ =F ₂ /S _2The sum of the input and moving force corresponds to the output, so F ₃ = (1+S ₁ /S ₂ )F _1However , F ₁ : Input from input member 21 F ₂ : Moving force of movable body 14 F ₃ : Output of output member 42 S ₁ : Elastic contact area between plate ring 40 and disk 39 S ₂ : Cylindrical part 45 and disk 39 In the case of a large input that causes the valve seat 31 and the valve member 33 to remain apart, the moving force of the movable body 14 becomes maximum, so the following relationship is established.

F ₃ =F ₁ +F ₂ max However, F ₂ max: Maximum moving force of the movable body 14 After this state, in order to connect the clutch,
In other words, if we gradually reduce the input F ₁ ,
When the clutch pedal is gradually released, the input member 21 also moves to the right. As a result, the tension in the portion 28 of the valve spring 30 also acts on the valve seat 31 and the valve member 3.
The valve seat 32 and the valve member 33 are separated while the valve member 3 remains seated, the atmosphere in the variable pressure chamber 16 moves toward the negative pressure chamber 15, and the differential pressure between the chambers 15 and 16 gradually decreases.
Finally, it returns to the non-operating position, and the atmosphere in the variable pressure chamber 16 is sufficiently sucked into the negative pressure source, eliminating the differential pressure between the two chambers 15 and 16. 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.

During operation, the disk 39 is compressed by a large acting force between the plate ring 40 and the cylindrical portion 45 and the plate ring 38, and the output member 42
In order to draw the inner circumferential portion of the disk 39 into the inner hole of the cylindrical portion 45 by frictional force, the inner circumferential portion of the disk 39, especially the gap between the output member 42 and the cylindrical portion 45 is The portion facing the disk tends to be eaten by the gap, but since the reinforcing member 47 is disposed between the disk and the gap, this can be prevented and the durability of the disk 39 can be improved.

A block 44 having a cylindrical portion 45 is connected to the hub portion 1.
Since the block 44 is supported by a stopper member 46 fitted into the through hole 19, it is only necessary to simply insert the block 44 into the through hole 19. Therefore, it is not necessary to form a thread on the inner surface of the through hole 19. The shape can be simplified.
Further, the stopper member 46 is formed with a claw 52 for attaching the boot 53, so that a single component has multiple functions, and the overall structure can be simplified.

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

Even if the negative pressure source fails, the plunger 22 engages with the stepped portion between the small diameter portion 24 and the medium diameter portion 23 of the through hole 19, and the input is directly transmitted, which causes the stopper member 46, block 44, and other members to At the same time, as the plunger 22 moves, the protrusion 41 of the casing 27 is attached to the plate ring 40 through the plate ring 40.
The plate ring 40 contacts the disk 39 through the
Since the inputs are transmitted from the to the disk 39, the output member 42 is biased to the left in response to the input and can be operated.

When the output member 42 swings due to an external force, the reinforcing member 47 can move along the end surface of the cylindrical part 45, so the center of swing of the output member 42 is at the contact part with the plate ring 38, ring 3
8 and the output member 42, and problems caused by applying an uneven load to the casing 27 or the plunger 22 can be prevented.

Although the above embodiments have various effects, the present invention can be practiced without being limited to the illustrated examples.

That is, the reinforcing member 47 may be of any type as long as it does not deform or intrude a part of the disk 39 into the gap between the cylindrical portion 45 and the output member 42; for example, instead of having a plate ring shape, the reinforcing member 47 may have a triangular cross section, It may be L-shaped, or a reinforcing member may be integrally molded onto the disk. Further, the reinforcing member may have a portion that fits into the above-mentioned gap from the disk side. Furthermore, a reinforcing member may be similarly provided in a portion of the disk 39 that faces the gap between the plate ring 38 and the output member 42. On the other hand, the structure and shape of other parts of the device 1 can be changed as necessary, such as using positive pressure instead of negative pressure, using a brake instead of a clutch, and adding wires to the input member. Examples of connections are given.

[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, 39... Disc, 4
7...Reinforcement member.

Claims (1)

[Claims] 1 A movable body 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,
an input member extending from one side of the movable body 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 an input member disposed between the output member and the input member, a valve device that controls the low-pressure chamber and the high-pressure chamber to generate a differential pressure that biases the movable body toward the one side in accordance with an input; and a sum of the input of the input member and the moving force of the movable body. a transmission mechanism for transmitting the output to the output member, the transmission mechanism comprising: a pot-shaped casing communicating with the input member and having an opening on the other side; a rubber disk disposed inside the casing; a plate member disposed adjacently inside the casing and in surface contact with the disk; a protrusion provided on the casing capable of transmitting the input to the disk; a cylindrical portion capable of transmitting a moving force to the disk, the output member extending into the casing through the disk and the cylindrical portion, and engaging with the plate member;
In the traction type booster which obtains the sum from the disk, the end surface of the cylindrical portion on the side of the disk is flat, and a center portion on the other side of the disk,
A towing type booster comprising an annular reinforcing member that fits into the output member and extends along an end surface of the cylindrical portion.