JPH0543306Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a brake adjustment structure for automobiles and the like.

(Prior Art) Drum brakes used in automobiles and the like are brake drums in which a lining (friction material) 2 is applied from the inside to a brake drum 1 that rotates together with a rotating shaft, as shown in an example in Fig. 3. The brake force is obtained by pressing the shoe 3. This brake shoe 3 operates in response to operating force from a wheel cylinder 6 attached to the inner surface of the back plate 4 via a reinforcement 5, and the friction force generated at this time can stop the wheels. ing. Conversely, when the operating force from the wheel cylinder 6 is removed, the force of the return spring 7 returns to the original position and releases the wheel from the lock. Further, the operating force of the wheel cylinder 6 applied to the brake shoe 3 is controlled by a piston 8 that partially protrudes from inside the wheel cylinder 6.
This is done by entering and exiting. This piston 8 is connected to an adjustment gear 9 provided in the wheel cylinder 6.
The amount of protrusion can be adjusted by rotating the , and this adjustment can be done not only during initial assembly, but also over long periods of use as the lining 2 wears out and the gap between it and the rotating drum 1 increases, increasing the response time to braking. This can be done when the brakes are not working properly, and the gap between the lining 2 and the rotating drum 1 can be corrected.

As shown in FIGS. 4 and 5, the conventional structure for adjusting the adjustment gear 9 is to provide an adjustment hole 10 corresponding to the adjustment gear 9 and penetrating through the back plate 4, and insert a screwdriver or the like into this adjustment hole 10. The adjustment tool 11 is passed through the back plate 4 from the outside to bring the adjustment tool 11 into contact with the adjustment gear 9. Then, the tip of the adjustment tool 11 is moved while being engaged with the teeth of the adjuster gear 9 to rotationally feed the adjuster gear 9. The procedure for adjusting the brake is to first rotate the adjustment gear 9 in one direction until the brake shoe 3 is in full contact with the rotating drum 1, and then rotate it in the opposite direction by a predetermined amount to adjust the brake shoe 3. is returned, a predetermined gap is obtained between the rotating drum 1 and the brake shoe 3, and the brake is adjusted. However, this adjustment work is difficult because the adjustment tool 11 must be inserted into the adjustment hole 10 while avoiding other parts.

(Problems to be Solved by the Invention) However, the conventional brake adjustment structure described above is not provided with a means for guiding the adjustment tool 11 inserted through the adjustment hole 10. For this purpose, the adjustment tool 11 inserted from the adjustment hole 10
moves vertically and horizontally, making it difficult to engage the tip of the adjustment tool 11 with the teeth of the adjustment gear 9.
There was a problem with very poor workability.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a brake adjustment structure that can simplify adjustment work and improve workability.

(Means for Solving the Problems) In order to achieve the above object, the brake adjustment structure according to the present invention is configured such that the brake adjustment structure adjusts the protrusion amount of the piston by being rotated with the piston that applies the actuation force of the brake shoe. A brake adjustment structure in which an adjustment hole is provided in a back plate having a wheel cylinder having an adjustment gear attached to the inner surface thereof in correspondence with the adjustment gear, and a tool inserted through the adjustment hole rotates the adjustment gear. A guide portion is provided on the inner surface side of the back plate adjacent to the adjustment hole for abutting the tool inserted into the adjustment hole and restraining movement of the tool tip within a thickness region of the adjustment gear. , a guide plate extending the guide portion from a part of the edge of the adjustment hole toward the adjustment gear;
It is characterized by comprising a plate-shaped regulating part having an inclined surface at an end thereof facing away from the adjustment hole and facing the guide plate and decreasing the distance from the guide plate toward the adjusting gear side. do.

(Function) A guide portion consisting of a guide plate extending from a part of the edge of the adjustment hole toward the adjustment gear side and a plate-shaped restriction portion provided opposite to the guide plate at a distance from the adjustment hole is provided. At the end of the part, we have formed an inclined surface where the distance from the guide plate decreases towards the adjustment gear side, so if you insert the tip of the tool through the adjustment hole along the guide plate, it will be guided by the guide plate. Even if the tool is inserted biased toward the opposite side of the guide plate, the tip of the tool is guided toward the adjustment gear by the inclined surface of the restriction part, and the tool is easily engaged with the adjustment gear. It can be matched.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show essential parts of a brake adjustment structure according to an embodiment of the present invention. 1st
In the figures through FIG. 2, the same reference numerals as in FIGS. 3 through 5 indicate the same elements as in FIGS. 3 through 5.

The adjusting hole 10 provided in the back plate 4 in correspondence with the tooth surface of the adjusting gear 9 is formed in a rectangular shape extending along the width direction of the diameter of the adjusting gear 9. Further, a guide plate 13 is attached to the inner surface of the back plate 4 along the upper edge 19 of the adjustment hole 10. This guide plate 13 is formed by bending a flat metal material into an L-shape having a fixed piece part 14 and a guide piece part 15. The fixed piece part 14 is fixed to the back plate 4 by welding or the like.
The guide piece portion 15 is in a state of protruding toward the adjustment gear 9 side. On the other hand, the reinforcement reinforcement 5 has a portion corresponding to the adjustment hole 10.
A regulating part 16 is provided along the lower edge of the adjustment hole 10 and extends to the vicinity of the line It forms an inclined surface 17 having a shape that slopes downward as the direction increases.

The restricting portion 16 and the guide plate 13 constitute a guide portion 18 that restricts vertical movement of the adjustment tool 11 inserted from the outside of the back plate 4 through the adjustment hole 10. That is, in this guide part 18, when the tool 11 inserted through the adjustment hole 10 is inserted with the tool 11 facing upward during insertion, the tip of the tool 11 comes into contact with the inner surface of the guide piece part 15, and further this guide It can be guided to the adjustment gear 9 side by the piece 15. Conversely, if it is inserted facing downward, it will come into contact with the inclined surface 17 of the regulating part 16, and will be guided upward by this inclined surface 17, causing the regulating part 1 to
It can be guided to the adjusting gear 9 side along the tip of 6. After insertion, when the tip of the tool 11 tries to move upward, the tip side of the tool 11 collides with the inner surface of the guide piece 15 and cannot escape to the upper side of the adjustment gear 9. Conversely, when the tip of the tool 11 tries to move downward, the tip side of the tool 11 collides with the tip of the regulating portion 16, and the downward movement of the adjustment gear 9 is restricted. That is, the guide piece 15 and the restricting portion 16 can restrict the vertical movement of the distal end side of the tool 11 after insertion within the thickness region of the adjustment gear 9. Note that the rear end side of the tool 11 can be restricted by the upper and lower edges 19 and 20 of the adjustment hole 10.

In the brake adjustment structure configured in this way,
When inserting the tool 11, the guide piece 15 and the restriction part 16
Adjustment gear 9 by regulating tool 11 with the tip of
Further, after insertion, the tool can be restrained within the thickness region of the adjustment gear 9 by the guide piece part 15 and the tip of the restriction part 16. Therefore, when the tool 11 is inserted, the tip of the tool 11 inevitably collides with the adjustment gear 9. In this state, the tool 11 is attached to the teeth of the adjustment gear 9.
When the tool 11 is moved in the direction of adjustment, the adjustment gear 9 can be easily rotated and fed without the adjustment gear 9 and the tool 11 coming out of engagement in the vertical direction, improving work efficiency. do.

Note that in the above embodiment, the guide portion 18 is a guide plate 13 that is a separate component from the back plate 4.
and restriction part 1 which is an extension of reinforcement reinforcement 5
6, but the guide piece 1
The portion corresponding to 5 and the portion corresponding to the regulating portion 16 may be integrally molded with the back plate 4. Furthermore, the shapes of the guide plate 13 and the regulating portion 16 are not limited to the shapes of the embodiments, and the shapes of the adjustment hole 1
It goes without saying that various modifications may be made as long as the vertical movement of the tip of the tool 11 passing through 0 can be restricted and regulated within the thickness region of the adjustment gear 9.

(Effects of the invention) As explained above, according to the brake adjustment structure according to the invention, adjustment can be made by the regulating part having an inclined surface whose distance from the guide plate decreases toward the guide plate and the adjustment gear. The tip of the tool inserted through the hole can be easily guided to the adjustment gear side without shifting and can be engaged with the adjustment gear, making it easier to adjust the rotation of the adjustment gear with the tool when adjusting the brake gap, improving work efficiency. In particular, since the guide portion does not protrude outside the back plate, safety during work is excellent and it does not interfere with other work.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential parts of a brake adjustment structure according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the same structure taken along line A-A in Fig. 1, and Fig. 3 is a general FIG. 4 is a schematic plan view of the brake system structure, FIG. 4 is a perspective view of essential parts of a conventional brake adjustment structure, and FIG. 5 is an enlarged sectional view of the same structure taken along line B-B in FIG. 4. 3... Brake shoe, 6... Wheel cylinder, 8... Piston, 9... Adjustment gear,
10...adjustment hole, 11...adjustment tool, 13...
...Guide plate, 15...Guide piece part, 16...Restriction part, 18...Guide part.

Claims (1)

[Scope of utility model registration request] A wheel cylinder having a piston that applies an actuation force of the brake shoe and an adjustment gear that is rotated and adjusted to adjust the protrusion amount of the piston is provided on the back plate on the inner side, and an adjustment hole is provided corresponding to the adjustment gear, The adjustment structure of the brake is configured to rotate the adjusting gear with a tool inserted through the adjusting hole, wherein the tool inserted into the adjusting hole is brought into contact to control the movement of the tip of the tool in the thickness area of the adjusting gear. A guide portion that restrains the adjustment gear is provided on the inner surface side of the back plate adjacent to the adjustment hole, and the guide portion is connected to a guide plate that extends from a part of the edge of the adjustment hole toward the adjustment gear; It is characterized by comprising a plate-shaped regulating part having an inclined surface at an end thereof facing away from the adjustment hole and facing the guide plate and decreasing the distance from the guide plate toward the adjusting gear side. Brake adjustment structure.