JPS6018674Y2 - Hydraulic brake device boot protector - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hydraulic brake device, and in particular, the purpose of this invention is to prevent damage to the dust-proof boot of the cylinder when inserting a tool through the hole in the back plate and rotating the gap adjustment gear attached to the piston. This invention relates to a boot protector for a vehicle hydraulic brake system.

Generally, in a vehicle hydraulic drum brake device 1 as shown in FIG. 1, in order to adjust the gap between the drum and the shoe 2 due to wear of the brake lining, the second
As shown in the figure, a gap adjustment gear 5 is fixed to the outer periphery of an adjustment bolt 4 screwed onto one end of the piston 3, and this gear 5 is attached to a cylinder mounting plate 6 (hereinafter referred to as a back plate).
The adjusting bolt 4 is rotated by a tool such as a screwdriver through the hole 7, and the adjusting bolt 4 is moved relative to the piston 3 by screw action, thereby moving the shoe 2 that contacts the tip of the bolt toward the drum.

By the way, in the hydraulic piston-cylinder device 8 incorporated in this type of hydraulic brake device, from the viewpoint of ease of assembly and disassembly, the end of the cylinder 9 on the side where the piston 3 enters and exits is sealed with a rigid end plate or the like. There are many cases where the lids are not closed.

Instead, as best shown in Fig. 2, a dustproof and waterproof boot 1◎ made of an elastic material is installed between the outer circumference of the cylinder end and the outer circumference of the piston 3, so that it can be seated inside the cylinder. Prevents valves and water droplets from entering.

Such a dustproof boot 10 is normally located near the gap adjustment gear 5 due to the structure of this type of brake device.

In particular, in a type in which the piston 3 and gear 5 are integrated, the gap between the gear 5 and the dustproof boot 10 is small.

Since the back plate 6 exists on the inside of the wheel when viewed from the entire vehicle body, as shown in FIG.
1 and try to rotate the gap adjustment gear 5, the driver 11 may slip or come off the teeth of the gear 5, and the tip of the driver may damage the dustproof boot 10 next to it. be.

The object of the present invention is to provide a boot protector that eliminates this danger.

Another object of the present invention is to provide a boot protector that also has the function of preventing the dustproof boot from coming off the end of the cylinder.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fourth is a boot protector 12 according to an embodiment of the present invention.
FIG. 5 is a partial side view showing the boot protector 12 shown in FIG. 4 attached to the hydraulic piston-cylinder device 8.

The boot protector 12 of this embodiment includes a retaining ring-shaped portion 12a having a diameter slightly smaller than the outer diameter of the dustproof boot 10 attached to the outer periphery of the cylinder 9, and a retaining ring-shaped portion
It has a substantially U-shaped tongue piece 13 formed in a part of 2a.

The retaining ring-shaped portion 12a functions as a boot holding member.

The boot protector 12 is made of a metal plate having some elasticity, such as a regular piece of steel.

To attach the protector 12, the retaining ring portion 12a is expanded outward using its elasticity, and is pressed onto the outer circumference of the dustproof boot 10 attached to the cylinder 9.

In this case, the tongue piece 13 is located near the adjustment hole 7 of the back plate 6, and the bottom part 13a of the tongue piece
so that it comes into contact with the back plate 6.

The tip 13b of the tongue piece 13 extends between the hole 7 of the back plate 6 and the dust-proof boot 10, so that when looking through the hole 7 from the back side 6a of the back plate 6, the dust-proof boot 10 is connected to the tongue. It is hidden by piece 13.

Therefore, as shown in FIG. 5, when an adjustment tool such as a driver 11 is inserted through the hole 7 of the back plate 6 and the adjustment gear 5 is rotated, the tip of the driver 11 is used for dustproofing because of the tongue piece 13. It never hits Boots 10.

Furthermore, the slightly inclined surface extending from the bottom 13a of the tongue piece 13 to its tip 13b serves as a guide for the driver 11.

FIG. 6 is a perspective view of a boot protector 12 showing another embodiment of the present invention, in which both ends of the retaining ring-like portion are hooked together, thereby providing dustproof protection. The boot is fastened to the outer end of the cylinder from its entire circumference.

As described above, the present invention has the function of preventing the dust-proof boot from coming off and the function of preventing damage caused by a tool when adjusting the boot gap, and has a simple structure and a great effect.

Installing the boot protector is also easy.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a hydraulic drum brake device.
Figure 2 is an enlarged cross-sectional view taken approximately along the line ■-■ in Figure 1, Figure 3 is a cross-sectional view showing how the adjustment tool damages the dust-proof boot when adjusting the brake gap; FIG. 4 is a perspective view of a boot protector according to an embodiment of the present invention, FIG. 5 is a partial side view of the hydraulic piston-cylinder device shown with the boot protector of FIG. 4 installed, and FIG. FIG. 3 is a perspective view showing another embodiment of the present invention. 5...Gap adjustment gear, 6...Back plate, 7...Adjustment hole, 10...
... Dustproof boots, 11 ... Driver, 12
...Boot protector, 13...tongue piece.

Claims (1)

[Scope of utility model registration request] It has a hydraulic piston-cylinder device in which a gap adjustment gear is attached to the piston and a dustproof boot is installed between the outer circumference of the cylinder and the outer circumference of the piston, and the gap adjustment is carried out through a hole formed in the cylinder mounting plate. In a hydraulic brake device in which a brake gap is adjusted by rotating a brake gear, a part of a boot holding member that presses the dustproof boot to the outer circumference of the cylinder includes:
A boot protector for a hydraulic brake device, characterized in that the tongue piece is shaped like a tongue piece, and the tongue piece extends between the hole of the cylinder mounting plate and the dustproof boot.