JPS6018675Y2 - Guide device for gap adjustment tool in hydraulic brake equipment - 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. The present invention relates to a guide device for a gap adjustment tool in a hydraulic brake system for a vehicle.

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).
By rotating the adjustment bolt 4 with a tool such as a screwdriver through a hole 7 formed in the hole 7 and moving the adjustment bolt 4 relative to the piston 3 by screw action, the shoe 2 that contacts the tip of the bolt is moved toward the drum side.

By the way, in the hydraulic piston-cylinder device 8 incorporated in this type of 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 as follows.
Many of them are not sealed tightly with rigid end plates.

Instead, as best shown in FIG. 2, a dustproof and waterproof boot 10 made of an elastic material is installed between the outer periphery of the cylinder end and the outer periphery of the piston 3. 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.

An object of the present invention is to provide a guide device for a gap adjustment tool that eliminates such a risk.

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

FIG. 4 is a perspective view showing a guide device for a gap adjustment tool according to an embodiment of the present invention before being installed;
FIG. 5 is a partial side view of the hydraulic piston-cylinder device 8 shown in FIG. 4, which is fixed to the back plate 6 by welding or the like.

In the guide device of this embodiment, a base portion 12a of a steel piece bent into an L-shape is fixed to a back plate 6, and a tongue portion 12b at the tip is connected to a gap adjustment hole 7 of the back plate 6 and a gap adjustment gear. 5, so that when viewed through the hole 7 from the back side 6a of the back plate 6, the dustproof boot 10 is hidden behind the tongue portion 12b.

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 protected from dust by the tongue portion 12b. It will not hit the boots 10.

The tip of the tongue portion 12b acts as a guide or positioning for the driver 11, so that the driver 11
This makes it easy to engage the teeth of the adjusting gear 5.

The guide device for a gap adjustment tool of the present invention is not necessarily limited to the shape shown in FIGS. 4 and 5, but various forms are possible.

6 to 12 show various embodiments of the present invention, and the same parts as shown in FIG. 3 or 5 are given the same reference numerals.

In the one shown in FIG. 7, a part of the center of the base 12a of the steel piece is formed in different steps, and this is mounted by inserting it into the edge of the hole 7 of the back plate 6 as shown in FIG. do.

FIG. 9 shows a guide device for a gap adjustment tool formed in a U-shape as a whole, with a seventh guide device at the end of both legs 15 of the U-shape.
The installation is similar to that shown in the figure by forming a base portion 12a and providing an opening 13 in the top portion 14 thereof into which a driver is inserted.

A tongue portion 12b protrudes from the top portion 14 and extends between the hole 7 of the back plate 6 and the dustproof boot 10.

The guide device for the gap adjustment tool of this embodiment uses spring steel, and when it is installed in the hole 7 of the back plate 6, its legs 15 are slightly elastically deformed inward, and the tool is inserted into the hole 7 by the spring action. do.

FIG. 10 is a partial side view of the hydraulic piston-cylinder device when the gap adjustment tool guide device of FIG. 9 is installed.

In order to rotate the gap adjustment gear 5 in this embodiment,
A driver is passed through the hole 7 of the back plate 6 into the opening 13 of the top 14 of the guide device and the tip of the driver is engaged with the teeth of the gear 5.

Even if the driver is accidentally inserted into the position 11' in FIG. 10 through the hole 7, it will not hit the dustproof boot 10 because it will be blocked by the tongue 12b protruding from the top 14 of the guide device.

The opening 13 of the top portion 14 serves as a clearance for the teeth of the gap adjustment gear 5, so that the teeth of the gear 5 do not come into contact with the top of the guide device.

In the embodiment shown in FIG. 11, when forming the gap adjustment hole 7 in the back plate 6, the entire circumference of the hole is not completely punched out, but the hole is connected at one side, and this portion The tongue piece 12 is formed by bending the tongue piece 12 toward the dustproof boot side.

The driver of the adjustment tool is restrained by this tongue piece 12 and does not hit the dustproof boot.

In this embodiment, the gap adjustment hole 7 and the guide device for the gap adjustment tool can be formed at the same time by press punching from the back plate, so manufacturing is extremely simple.

In the embodiment shown in FIG. 12, a cylinder cover (indicated by reference numeral 16 in FIG. 1) attached to the cylinder for heat shielding of the hydraulic fluid of the hydraulic piston-cylinder device is extended between the back plate 6 and the cylinder 9. and one end thereof is connected to the hole 7.
and the dust-proof boot 10 to form a tongue piece 12 having the above-mentioned function.

In the embodiments shown in FIGS. 4 to 6, the guide device may be attached to the back plate by arc or spot welding, adhesive bonding, or other suitable fixing methods.

As described above, the present invention has a very simple structure and has the function of preventing damage to the dustproof boot caused by tools during brake gap adjustment and the function of guiding or positioning the tool, and is of practical use. It has a big effect.

[Brief explanation of the drawings] 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; 4 to 12 are diagrams showing various embodiments of the present invention. 5... Gap adjustment gear, 6... Back plate, 7... Adjustment hole, 10...
・・Dustproof boots, 11・・Driver, 12・
... tongue piece, 12b... tongue piece part.

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 periphery of the cylinder and the outer periphery of the piston, and the gap can be adjusted from the gap adjustment hole formed in the cylinder mounting plate. In a hydraulic brake device in which a brake gap is adjusted by inserting a tool and rotating the gap adjustment gear, the tool is fixed near one edge of the gap adjustment hole of the cylinder mounting plate, and the tip thereof is connected to the gap adjustment gear. A guide device for a gap adjustment tool, comprising a rigid protrusion member extending between the outer peripheral edge of the adjustment gear and the gap adjustment hole.