JPS5931495Y2 - booster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a booster configured by interconnecting a pair of shells, and more particularly to an improvement in the connection structure of the pair of shells.

Boosters such as brake boosters and clutch boosters are
Generally, a pair of shells are interconnected to form the outer shell.

An example of the connection structure between shells in this outer shell body will be described with respect to the brake booster 1 shown in FIGS. 1a and 1b.
This brake booster 1 is equipped with a first shell 2 as a front shell and a second shell 3 as a rear shell. The outer periphery of a diaphragm 4 housed in the body is held.

The first shell 2 is generally formed into a cylindrical shape with a bottom, and a smooth stepped portion 6 is formed in the cylindrical portion 5 on the opening side, and the inner diameter of the opening of the cylindrical portion 5 is is set slightly larger than the inner diameter.

In addition, notches 1 are carved at a plurality of places at predetermined intervals on the circumferential surface of the opening end of the first shell 2, and a part of the curved band-shaped part 8 where no notches 7 are formed is radially inward. A plurality of bulging engagement claws 8a are formed.

The axial distance between the bottom end surface 7a of the notch 7 and the inner end surface of the engaging claw 8a corresponds to the thickness of the second shell 3, which will be described in detail below.

On the other hand, the second shell 3 is generally formed into a disk shape, and an annular groove 9 opened radially outward for engaging the outer circumference of the diaphragm 4 is formed on its outer circumference.

The diameter of the outer circumferential end of the second shell 30 extending in the radial direction corresponds to the inner diameter of the large diameter portion outward from the stepped portion 6 formed in the first shell 2. ,
A protrusion 10 that engages with the notch 7 and allows relative rotation of the first shell 2 and the second shell 3 at a predetermined angle is provided in succession.

Further, on the outer circumferential portion of the second shell/L/3, the protruding portion 10 is provided.
When the second shell 3 is fitted into the first shell 2 with the circumferential direction - side of the notch 70 aligned with the circumferential direction - side of the notch 70, the engaging claw 8a formed on the first shell 2 A notch 11 is cut out to avoid interference with.

In order to connect the first shell 2 and second shell 3 having the above configuration, first, the outer periphery of the diaphragm 4 is fitted into the annular groove 9 of the second shell 3, and then a A state in which the negative circumferential side of the protruding portion 100 is aligned with the positive circumferential side of the notch 7 formed in the first shell 2, that is, the engaging claw between the notch 11 of the second shell 3 and the first shell 2. 8a, the second shell 3 is aligned with the first shell 2 in the axial direction.
Fits inside.

Then, the protruding portion 10 of the second shell 3 is connected to the first shell 2.
When it comes into contact with the bottom end surface 7a of the notch 7, the protrusion 1
The shells 2 and 3 may be relatively rotated until the other side in the circumferential direction of the notch 7 comes into contact with the other side in the circumferential direction.

In this state, the second shell 3 is connected to the notch 7 of the first shell 2.
and the engaging claw 8a and connected to the first shell 2, and the outer peripheral part of the diaphragm 4 is connected to the first shell 2.
The inner circumferential surface of the second shell 3 and the inner surface of the annular groove 9 of the second shell 3 are closely held, and the airtightness of that part is maintained.

By the way, when the conventional device having the above configuration is operated, vacuum pressure is generated in the outer shell body in which the first and second shells #2 and 3 are formed, and as a result, the protrusion 10 is exposed to pressure every time it is operated. A load will be applied repeatedly to the

Therefore, the protruding part 10 must have sufficient strength performance, but if the width of the protruding part 10 in the circumferential direction is increased, a predetermined gap between the first and second shells 2 and 3 is required for assembly. Said circumferential strip 80 to allow relative rotation of the corners.
If the width has to be reduced, there is a risk that the engaging claw 8a supported by the band-shaped portion 8 will not have sufficient rigidity.

From the above viewpoint, there is a limit to the width of the protrusion 100,
There was a certain limit to its strength performance.

In view of the above points, the present invention was made with the aim of obtaining a booster that improves the strength performance of the connecting structure of the first and second shells. The vicinity of the bottom of the provided notch is bulged out inwardly relative to its adjacent portion, and the outer peripheral edge of the second shell is brought into contact with the bottom end surface of the notch so that the bottom end surface and the second shell are in contact with each other. It is characterized in that the second shell is sandwiched and held between a plurality of engagement claws that are formed to bulge inward at the peripheral edge of the opening of one shell.

The present invention will be explained below with reference to the illustrated embodiments. Fig. 2a is a longitudinal sectional view showing the main part of the apparatus of the present invention, and Fig. 2 is a side view of the main part.

In FIGS. 2a and 2b, the bottom end surface 12a of the notch 12 has a main portion shaped like the cylindrical portion 5 of the first shell 2 extending directly toward the opening, and both ends thereof are stepped. It is bent to smoothly connect to the shaped portion 6.

Therefore, the inner circumferential surface near the bottom end surface 12a is relatively bulged inward than the stepped portion 6.

On the other hand, the second shell 3 is set such that its outer diameter matches the inner diameter of the large diameter portion, that is, the circumferential band portion 8, as in the conventional device described above.

Since the device of the present invention has the above configuration, the bottom end surface 12a supports the outer peripheral edge of the second shell 3 when the first and second shells 2 and 3 are connected. The contact area between shells 2 and 3 is the second
As shown in the figure, it has increased dramatically compared to the conventional device, and is extremely advantageous in terms of strength.

Furthermore, since the protrusion 10 becomes nothing more than a rotational positioning member, its width can be reduced, and the width of the notch 70 can also be reduced, and the rigidity of the opening of the first shell 2 can be improved. .

Figures 3a and 3b show another embodiment of the present invention, in which the first and second shells 13.14 each have a flange part 15.16 formed on their outer periphery, and these flange parts 15.1
The present invention is applied to a booster having a structure in which the outer periphery of the diaphragm 4 is clamped by the diaphragm 4.

That is, the bottom end surface 17 of the notch 17 of the first shell 13
The vicinity of the shell a is bulged inward than its adjacent portion, and the outer peripheral edge of the second shell 14 is brought into contact with the bottom end surface 17a, thereby interconnecting both shells 13 and 14 to form an outer shell. It is composed of

Note that since no load is applied to the protruding portion 10, it is also possible to omit this.

Furthermore, it goes without saying that the present invention can be applied not only to brake boosters but also to boosters such as clutch boosters.

In manufacturing the above-mentioned booster, the plurality of engaging claws formed to bulge inward at the periphery of the opening of the first shell 1 are arranged so that the diaphragm 4 is sandwiched within the first shell. 2
A bulge can be formed after the shell is fitted and connected,
Therefore, the notch 11 can be omitted when the shell does not need to be disassembled.

As described above, according to the present invention, it is possible to obtain a booster in which the strength performance of the connecting structure of the first and second shells is extremely excellent.

[Brief explanation of the drawing]

FIG. 1a is a longitudinal sectional view of a conventional brake booster, FIG. 1 is a side view of the main part of FIG. 1a, and FIG. 2a is an embodiment of the brake booster according to the present invention. , longitudinal cross-sectional view of main parts,
Fig. 2 is a side view of the main part shown in Fig. 2a, Fig. 3a is a longitudinal sectional view of the main part showing another embodiment of the present invention, and Fig. 3 is shown in Fig. 3a. FIG. 3 is a side view of main parts. 1... Booster, 2, 13... First shell, 3°14... Second shell, 12.17.
...Notch, 12a, 17a...Bottom end surface.

Claims (1)

[Scope of utility model registration request] A plurality of notches are carved at predetermined intervals on the peripheral edge of the opening side of the first shell, and the vicinity of the bottom of the notches is bulged out relatively inwardly than the adjacent portion, and the first shell is The outer circumferential edge of the second shell to be fitted is brought into contact with the bottom end face of the notch, and the bottom end face is engaged with a plurality of locations bulging inward at the opening circumferential edge of the first shell. A booster comprising a pair of mating claws and holding the second shell sandwiched therebetween.