JPS6310371Y2 - - 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 main body having an internal space, a movable body that is movably arranged in the internal space and 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; a hole formed through the cylindrical portion and the movable body; and a cylindrical portion fitting into one side of the hole; an input member that penetrates the low pressure chamber and the main body and protrudes outward; an output member that fits into the other side of the hole; and an output member that is disposed within the hole and responds to the input from the input member. a valve device that operates to generate a pressure difference between the low pressure chamber and the movable body to move the movable body toward the low pressure chamber; an output transmission device that transmits the moving force of the movable body to the output member; a boot disposed between the other end of the cylindrical portion; an air supply path formed from the valve device to the other end of the cylindrical portion; a filter disposed in a space defined between the other end of the cylindrical part and through which the output member passes; the output transmission device includes a block member disposed at the other opening of the hole; It is proposed that the output member penetrates through the block member so as to be able to swing. (Japanese Patent Application No. 56-184668) However, in the above method, although the outer surface of the cylindrical portion can be covered with the boot, a blocking member is arranged at the end of the cylindrical portion, and one end of the boot is fitted. There is a problem in that the structure for attaching both of them to the cylindrical part tends to be complicated because the filter has to be attached to the cylindrical part. This problem is becoming more and more prominent.

Furthermore, in the above device, the filter is placed in contact with the outer peripheral surface of the output member, so when the output member swings relative to the block member, the filter and the output member on the opposite side of the swing direction There is a problem that a gap is created in between, and during this gap, dust and dirt enter the valve device side through the air supply path.

The present invention has been made in view of the above problems, and aims to provide a tow type booster in which a boot can be attached with a simple structure and in which the output member does not interfere with the filter. In order to achieve this purpose, a cylindrical auxiliary tool is fixed to the block member, and the cylindrical auxiliary tool is fitted onto the output member while allowing the output member to swing, and one end of the boot is attached to the auxiliary tool. and the filter is positioned on the radially outer side of the auxiliary tool.

DETAILED 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 the 3rd side
6 are each divided into sections.

A cylindrical 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. A through hole 19 is provided.

Fitted into the left end of the through hole 19 is an input member 21 that extends through the rear shell 2 and has a clevis 20 screwed onto the outer end of which is connected to a clutch petal (not shown). A plunger 22 , which is slidably connected to the plunger 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 .

The plunger 22 and the input member 21 have a spherical head 21a of the input member 21 slidably and swingably fitted into a recess 22a provided in the plunger 22 having a spherical bottom surface, and an end of the recess 22a. A stopper 78 made of a wire fitted to the part and the head 21a
An annular auxiliary member 79, which is harder than the head 21a, is disposed between the head 21a and the head 21a.

The auxiliary member 79 is attached to the input member 21 by fitting it into the input member 21 before screwing the clevis 20 or the like, or by fitting it by expanding a notch. is spherical in order to increase its contact area, and is also shaped to form a slight air gap between it and the input member 21 to allow the input member 21 to swing. 22b is the stopper 7
8 This is a notch provided in the plunger 22 for removal.

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
The head 26 is slidably fitted into the casing 27 with the head 26 positioned inside the casing 27 through the hole 27a. head 26
is formed into a hemispherical shape, and this head 2
The left end central portion of the casing 27 that contacts 6 is
A spherical portion 27b forms a spherical recess corresponding to the head 26, and the spherical surfaces are joined to each other so as to be swingable. 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 through hole 1
A valve member 33 made of rubber and urged to be seated on a valve seat 32 formed on the inner wall of the valve member 9 is disposed.
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 poppet-shaped valve member 33 toward the step 34 of the through hole 19. has been done. Further, the cylindrical coil spring portion 29 connects the left end seat portion 35 of the valve member 33 to each valve seat 31, 32.
It is designed to press against the ground. 36,3
7 is a spring receiver.

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.

A cylindrical portion 45 of a synthetic resin block 44 fitted into the opening of the through hole 19 is movably fitted between the outer periphery of the output member 42 and the plate ring 40 and abuts against the right end surface of the date disk 39. It has become possible to contact
This block 44 is supported while being prevented from coming out by a stopper 46 fitted into a groove 48 formed in the inner periphery near the right opening end of the through hole 19. The stopper 46 is formed of a wire and has an annular C-shape. It has a mold shape. Note that 49 is a hole formed in communication with the groove 48 for removing the stopper 46. A plate ring-shaped reinforcing member 47 having an inner hole approximately equal to the outer shape of the output member 42 is provided on a part of the disk 39 facing between the cylindrical portion 45 and the output member 42.
Furthermore, 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 are arranged integrally. The space between the disks 39 and 39 is sufficiently large so that they do not directly oppose each other.

A cylindrical auxiliary tool 50 is press-fitted onto the inner periphery of the right end of the cylindrical portion 45 of the block 44, allowing the output member 42 to swing relative to the block 44, and the output member 42 passes through the inner hole. This aid 5
An annular portion 54 of a boot 53, which is disposed to cover the entire cylindrical portion 18, is fitted and held in a collar portion 51 formed at the right end of the cylindrical portion 18. This boots 53
The bent portion formed on the outer peripheral side of the annular portion 54 has a ventilation hole 52 formed therein, and a filter 5 between the block 44 and the end of the cylindrical portion 18.
This is a housing section 55 for clamping and placing 6. A retractable bellows part 57 is integrally provided on the left side of the housing part 55, and the left end of the bellows part 57 is provided with the cylindrical part 18 and the opening 17 of the front shell 3.
A lip-type sealing portion 59 is integrally provided between the holder and the holder to be fitted with a retainer 58. 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 cylindrical portion 18 is connected to a filter 80 disposed on the left side of the block 44, a large number of grooves 62 formed on the side periphery of the block 44, the cylindrical portion 18, and the block 4.
An annular filter 56 is arranged in a space defined between the auxiliary tool 50 and the boot 53 and is located on the radially outer side of the auxiliary tool 50, and communicates with the atmosphere through a hole in the boot 53. ing. Furthermore, the pressure change room 1
6 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 through a hole 65 extending along the axial direction.
This communicates with the space around the valve member 33. The negative pressure chamber 15 is connected to a negative pressure source (such as an engine intake manifold or a vacuum pump) 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 stretched 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 in a recess 68 of the rear shell 2. The sealing device 69 is
The slide plate 70 is made of synthetic resin and has a ring shape that fits almost snugly into the input member 21, and a rubber seal member 71 that covers the entire left side of the slide plate 70. The two are joined together via projections and recesses to be 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 at its inner end which elastically contacts the input member 21, and a fixed portion 73 with a mandrel which is press-fitted into the corner of the recess 68 at its outer end. A flexible connecting portion 74 is provided between the inner portion including the lip portion 72 and the fixed portion 73, allowing the inner portion to be displaced. A retaining ring 75 prevents the fixed portion 73 from coming loose and also holds down the outer portion of the connecting portion 74.

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 connecting portion 2a and the connecting portion 74 communicates with the outside air through a small hole 74a formed in the communicating portion 74 and having a relatively small passage area. Note that each lip portion 72,
A plurality of annular protrusions are formed on 72a,
A seal is achieved by bringing these protrusions into elastic contact.

In addition, in FIG. 1, reference numeral 76 indicates a lip-type sealing member attached to the plunger 22, and 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).

The functions of the device 1 will be described below.

Assume that it is currently in an inactive state. Then, the casing 27 moves rightward to the position where it abuts against the block 44 due to the tension in the portion 28 of the valve spring 30, and this causes the plunger 22 to move to the right via the stem 25. The valve member 33 is seated and moved while overcoming the tension of the valve member 33. At this time, the valve member 33 is separated from the valve seat 32 and the valve member 33, and the valve seat 31 and the valve member 33 are seated, so each chamber 15, 16 is isolated from the atmosphere and communicates with each other. As a result, the same negative pressure is introduced into both chambers 15 and 16. Both rooms 15, 16
Since there is no pressure difference between them, the movable body 14 moves to the right due to the tension of the preload spring 67 against the leftward biasing force that the cylindrical portion 18 receives from the atmosphere, and the front shell 3 and the diaphragm 9 They are in a position where they are in contact with each other.

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 cylindrical 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 is separated from the valve member 33 and the variable pressure chamber 1
Supply atmosphere to 6.

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 and the input are balanced, and the rest of the output and the moving force of the movable body 14 are balanced, and furthermore, the input and the moving force are balanced at a predetermined level. Balance in relationships.

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 and elastic contact area Note that 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,
As the input F ₁ is gradually reduced, in other words, as 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.

The input member 21 and the plunger 22, the plunger 22 and the casing 27, and the plate ring 38 and the output member 42 are all in contact with each other via spherical surfaces, so even if each member falls, no prying or the like will occur. , operate smoothly. especially,
The plunger 22 can eliminate the influence of falling from the input member 21 and the casing 27,
The valve member 33 does not unnecessarily separate from the valve seats 31, 32.

Since the block 44 is prevented from coming out and is supported by a stopper 46 fitted in the groove 48, the block 44 can be arranged with a simple arrangement structure, and the moving force of the movable body 14 is sufficiently appropriate. can be transmitted to the output member 42. Furthermore, since the stopper 46 is formed from a wire into a C-shape, it can be constructed from a commercially available product.

The head 21a of the input member 21 is connected to the stopper 78.
Since the auxiliary member 79 makes contact with the auxiliary member 79, the contact area can be made relatively large to prevent uneven wear of the head 21a, and the auxiliary member 79 itself is made of a highly hard material to increase the durability of this member 79. It also prevents wear and does not increase play.

The boot 53 is attached with one end as a seal portion 59 and the other end attached to the auxiliary tool 50 fixed to the block 44, so that the filter 5 is attached between the cylindrical portion 18, the block 44, and the boot 53.
6 is arranged, the mounting structure of the boot 53 becomes simple.

The auxiliary tool 50 is fitted onto the output member 42 while allowing the output member 42 to swing, and the filter 56 is located on the radially outer side of the auxiliary tool 50. Filter 5 is on the 54 side
It functions to press block 6, so block 4
Even if the output member 42 swings relative to the filter 56, the output member 42 contacts the filter 56 and causes deformation, causing the filter 56 and the surrounding cylindrical portion 1 to
8 and other members, and the function of removing dust from the filter 56 can be fully demonstrated.

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

That is, an auxiliary tool for supporting one end of the boot is fitted onto the block while allowing the output member to swing, and a filter placed between the end of the cylindrical portion and the boot is placed outside the diameter of the auxiliary tool. The specific shape and structure of each part can be changed as you like, except that it is placed on the opposite side, and there are also examples of using positive pressure instead of negative pressure, and connecting wires to input members. Furthermore, the shape of the boot itself and the shape of the auxiliary tool itself can be changed as necessary.

As is clear from the above, according to the present invention, one end of the boot is supported by the auxiliary tool fitted into the block member, so there is no need to provide a means for attaching the boot to the cylindrical part, and the block member Since it is only necessary to attach the members, the shape and structure of the cylindrical part can be simplified, and since the auxiliary tool for attaching the boot can be attached to the block, it can be installed without complicating the shape or structure of the block. In addition to this, it is also possible to fit the auxiliary tool onto the output member while allowing the output member to swing, and to connect the filter to the air supply path and to arrange the filter in the space defined between the boot and the cylindrical portion. Since it is located on the radially outer side of the auxiliary tool, interference of the output member with the filter due to swinging of the output member is avoided, and all of the supplied air can pass through the filter, so the structure can be simplified. In addition, it is possible to obtain a towed type booster that reliably prevents the intrusion of dust that may cause malfunction.

[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...Cylinder part, 42...
...Output member, 44...Block, 50...Auxiliary tool, 53...Boot, 54...Annular portion, 56...
...filter.

Claims (1)

[Scope of utility model registration request] 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; a valve device operative to generate a differential pressure to be moved;
an output transmission device that transmits the moving force of the movable body to the output member; a boot disposed between the main body and the other end of the cylindrical portion; and a boot provided from the valve device to the other side of the cylindrical portion. an air supply path formed up to an end; and a filter that communicates with the air supply path and is disposed in a space defined between the boot and the other end of the cylindrical portion, and that the output member passes through. In the traction type booster, the output transmission device has a block member disposed at the other side opening of the hole, and the output member penetrates through the block member so as to be able to swing. , a cylindrical auxiliary tool that is fitted onto the output member while allowing the output member to swing is fixed to the block member, one end of the boot is fitted to the auxiliary tool, and the auxiliary tool is A towed type booster comprising the filter located on the radially outer side.