JPH0541102Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a pneumatic booster having a housing in which a pair of shells are connected.

"Prior Art" A pressure booster used in an automobile brake system is installed between a brake pedal and a master cylinder, and transfers the force applied to the brake pedal connected to the input shaft to the engine's intake manifold, etc. This device uses negative pressure to double the pressure and transmit it to the master cylinder via the output shaft, reducing the operating force of the brake pedal.

One example of this type of pneumatic booster is the
The one disclosed in Japanese Patent No. 61-16402 is known. In this pneumatic booster, as shown in FIG. 9, the opening of a cup-shaped front shell 1 is enlarged to form an enlarged-diameter portion 2 and a stepped portion 3, while the rear shell 4 is shaped like a dish. The flange formed and provided at the opening thereof is inserted into the enlarged diameter portion 2 of the front shell 1, this flange is brought into contact with the stepped portion 3, and then the enlarged diameter portion 2 is inserted into the enlarged diameter portion 2 in a plurality of circumferential directions, etc. By caulking the enlarged diameter portion from the outside in the radial direction at the minute position, the rear shell 4 is prevented from slipping out from the front shell 1, the front shell 1 and the rear shell 4 are joined, and the entire circumference of this joint portion is covered with a protective member 5. covered by

``Problem to be solved by the invention'' However, in the device disclosed in Utility Model Application No. 61-16402, the entire circumference of the enlarged diameter portion is covered with the protective member 5, which not only increases material cost but also requires time and effort to assemble. There was a problem in that it took a long time and the cost increased.

Further, since the protective member is made of a soft material such as rubber or vinyl chloride, there is a problem that the protective member may peel off from the shell due to changes in the physical properties of the material after long-term use.

The present invention solves the above-mentioned problems of conventional products; the protective member does not peel off from the shell even after long-term use, the material and manufacturing costs are low, the assembly is easy, and the It is an object of the present invention to provide a pneumatic booster having a housing that is resistant to changes and durable.

"Means for Solving the Problems" The present invention has the following configuration in order to achieve the above object. That is, the rear shell is inserted into the cup-shaped front shell opening, the opening end of the front shell is caulked, and a part of the opening end is cut radially inward.The caulked parts are spaced apart in the circumferential direction. In a pneumatic booster in which both shells are joined by forming a plurality of shells at the same time, a groove part made of an elastic material covers a part of the outer periphery of the front shell opening end joint part and is recessed one step on the outer periphery side. The protective member is fitted into the groove by sandwiching the groove of the protective member with the groove disposed between the caulked portions and the inner circumferential side of the opening end of the front shell, and the protective member is inserted into the front shell. The structure includes a metal fitting that is attached to the opening end.

"Function" By covering only the parts of the front shell opening end joint that are easily touched by other equipment with a protective member, materials and manufacturing costs are low, assembly is easy, and the weight is reduced, and the mounting hardware is made of metal. Therefore, it is possible to provide a pneumatic booster having a housing that prevents the protective member made of an elastic material from loosening and peeling off from the shell, and is also resistant to temperature changes and durable. Furthermore, the metal fitting fits into the groove with the groove of the protective member sandwiched between the groove of the protection member and the inner peripheral side of the opening end of the front shell, so the metal fitting fits into the groove. The movement of the protective member with respect to the metal fitting is restricted by fitting into the metal fitting, and the metal fitting is prevented from rotating in the circumferential direction relative to the front shell by the caulking portion, and as a result,
The protection member is prevented from rotating in the circumferential direction with respect to the front shell.

"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 5. In FIG. 2, reference numeral 11 denotes a pneumatic booster, and the housing 12 of this pneumatic booster 11 consists of a cup-shaped front shell 13 and a dish-shaped rear shell 14. Housing 1
2 is divided into a front chamber and a rear chamber by a power piston (not shown) having a diaphragm. An input shaft 15 is connected to one side of the power piston via a valve mechanism (not shown), and an output shaft 16 is connected to the other side of the power piston. Input shaft 15 is connected to a brake pedal, and output shaft 16 is connected to a master cylinder.
An engine intake manifold is connected to the front chamber via a pipe 17.

When the pneumatic booster is not operating, the front chamber and the rear chamber are communicated with each other and both chambers are maintained in a vacuum, and when the pneumatic booster is operating, when the brake pedal is depressed, the The valve mechanism operates, and due to the action of this valve mechanism, atmospheric air flows into the rear chamber, creating a pressure difference between the front chamber and the rear chamber, and this differential pressure operates the power piston, which operates the output shaft 16 and boosts the power. It's starting to work.

The front shell 13 is formed into a cup shape, and its opening is enlarged in diameter, and a large diameter portion 18 and a stepped portion 19 are formed in the opening. The rear shell 14 is formed into a dish shape, and a flange 20 is formed at the opening thereof.

The rear shell 14 is fitted into the large diameter portion 18 of the front shell 13 , and its flange 20 is abutted against a step portion 19 of the front shell 13 .
Between the opening of the front shell 13 and the rear shell 14, an end portion 21 of a diaphragm made of rubber or the like is interposed as shown in Figs.

A plurality of equally divided locations in the circumferential direction of the large diameter portion 18 are caulked closer to the open end of the large diameter portion 18 than the flange 20, and the caulked portions 22 thus formed prevent the rear shell 14 from coming off from the front shell 13. ing.

The caulking portion 22 is formed by caulking the large diameter portion 18 from the outside in the radial direction toward the inside, and cutting a part of the open end of the large diameter portion 18 toward the inside in the radial direction. .

The large-diameter portion 18 of the front shell 13 is protected by a protective portion 2 only at the part where there is a possibility that other equipment may come into contact with the pneumatic booster 11 when the pneumatic booster 11 is installed.
Covered by 3.

The protective member 23 is made of an elastic metal material and has a U-shaped cross section and a circular arc shape in front of the large diameter portion 18, and the large diameter portion 18 is sandwiched between the protective members 23 from its end side. Covered.

The inner circumferential portion of the protective member 23 includes an arcuate plate portion 24 that is brought into contact with the flange 20 of the rear shell 14 shown in FIG. , and a notch 26 shown in FIG. 4 which serves as a relief so as not to inhibit the formation of the caulked portion 22.

The cut and raised portion 25 is elastically brought into pressure contact with the inner circumferential surface of the large diameter portion 18, thereby preventing the protection member 23 from coming off from the front shell 13. The position of the cut and raised portion 25 is formed at a position avoiding the caulked portion 22 so as not to coincide with the caulked portion 22 when the protective member 23 is attached to the large diameter portion 18.

The notch 26 is provided at a position that coincides with the caulked portion 22 when the protective member 23 is attached to the large diameter portion 18, and the caulked portion 22 is fitted into this notch 26, so that the caulked portion 22 and the notch are aligned. The positioning of the protection member 23 in the circumferential direction of the large diameter portion 18 is determined by engagement with the wall 26. Therefore, the position of the protective member 23 in the circumferential direction of the large diameter portion 18 can be freely regulated by the set position of the notch 26.

By being brought into contact with the front shell 13, the arcuate plate portion 24 positions the protection member 23 in the axial direction with respect to the front shell 13, and prevents the rear shell 14 from coming off from the front shell 13.

As described above, according to this embodiment, the notch 26
By setting the position appropriately, when the pneumatic booster is installed at a predetermined location, the large diameter portion of the housing 18
The protective member 23 can be attached only to locations where there is a risk of collision with other equipment, making it possible to reduce material and manufacturing costs, ease assembly, and have a housing that is resistant to temperature changes and durable. A type booster can be provided.

In the above embodiment, the large diameter portion 1 is provided only at a predetermined location of the large diameter portion 18 of the front shell 13.
Although the metal protection member 23 is attached so as to sandwich the 8th part, the metal protection member 23 is not limited to this,
As shown in FIG. 7 and FIG. 7, a protection member 31 made of soft material such as rubber or vinyl chloride has a U-shaped cross section and is arc-shaped along the large diameter portion 18. A fitting (protective member) 33 made of an elastic metal is attached to the groove 32 formed on the outer periphery of the protective member 31 so as to sandwich the end of the protective member 18 and the stepped portion 19 .
It may also be installed so that the ends of the large diameter portion 18 are sandwiched between the end portion and the end portion of the large diameter portion 18.

The grooves 32 are provided at a plurality of positions so as not to come into contact with the caulking portion 22 of the large diameter portion 18 when the protective member 31 is attached to the large diameter portion 18 .

The attachment 33 has a protective member 3 between it and the large diameter portion 18.
1 is elastically clamped, and when the fitting 33 engages with the caulked portion 22 of the front shell 13, the protective member 31 and the attachment 33 for the large diameter portion 18 are protected by the attachment 33 and the caulked portion 22. The circumferential positioning of is determined.

Note that the fixture 33 is not made of elastic metal and may be bent later.

"Effects of the invention" According to the invention, the rear shell is inserted into the cup-shaped front shell opening, the opening end of the front shell is caulked, and a part of the opening end is cut radially inward. In a pneumatic booster in which both shells are joined by forming a plurality of caulked parts at intervals in the circumferential direction, the front shell is made of an elastic material and covers a part of the outer periphery of the front shell opening end joining part; A protective member formed with a groove recessed one step on the outer circumferential side, and a protective member with the groove disposed between the caulked parts and the inner circumferential side of the opening end of the front shell sandwiched between the protective member and the inner circumferential side of the opening end of the front shell. In addition, since the protective member is configured to have a metal fitting for attaching it to the front shell opening end, only the portion of the front shell opening end joint that is lightly touched by other equipment is covered with the protective member. As a result, materials and manufacturing costs are low, assembly is easy, and weight is reduced.In addition, since the mounting hardware is made of metal, the protective member made of an elastic material is held firmly and prevents it from peeling off from the shell, and furthermore, it is able to resist temperature changes. It is possible to provide a pneumatic booster having a housing that is also strong and durable. Moreover, since the metal fitting fits into the groove between the groove of the protective member and the inner peripheral side of the opening end of the front shell, with the groove disposed between the caulked parts,
The movement of the protective member relative to the metal fitting is regulated by fitting the metal fitting into the groove, and the metal fitting is prevented from rotating in the circumferential direction relative to the front shell by the caulking portion. As a result, the protection member is prevented from rotating in the circumferential direction relative to the front shell, so that the protection member can be continuously held at a required location.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a rear view, Figure 2 being a side view, and Figure 3 being a side view.
The figure is a sectional view taken along the - line in Fig. 1, Fig. 4 is a sectional view taken along the - line in Fig. 1, Fig. 5 is a sectional view taken along the - line in Fig. 1, and Figs. 6 and 7. 6 shows another embodiment of the present invention, FIG. 6 is a rear view of the main part, FIG. 7 is a sectional view taken along the line - in FIG. 6,
FIG. 8 is a side view showing an example of a conventional pneumatic booster. 13...Front shell, 14...Rear shell, 18...Large diameter part, 19...Step part, 20...Flange, 22...Crimped part, 23, 31, 41...
...Protective member, 24...Circular plate portion, 25...Cut-up, 26...Notch, 33... Mounting tool (protective member).

Claims (1)

[Scope of Claim for Utility Model Registration] A crimping method in which a rear shell is inserted into a cup-shaped front shell opening, the opening end of the front shell is crimped, and a part of the opening end is cut radially inward. In a pneumatic booster in which both shells are connected by forming a plurality of parts at intervals in the circumferential direction, the front shell opening end joint part is made of an elastic material and covers a part of the outer periphery of the opening end joint part, and also has a part on the outer periphery side. a protective member formed with a one-step recessed groove; and a protective member with the groove disposed between the caulked portions, and fitted into the groove with the groove of the protective member sandwiching the inner peripheral side of the opening end of the front shell; A pneumatic booster comprising: a metal fitting for attaching the protection member to the opening end of the front shell.