JPH0135077Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a drum brake used in automobiles and the like.

(Prior art) Drum brakes used for steel wheels generally generate more heat due to friction between the brake shoe and the brake drum than those made of aluminum or cast iron, especially when the brake size is made as small as possible. This is required to be done effectively as heat absorption and heat dissipation are reduced. Therefore, conventionally, as shown in FIG. 9, a protrusion 1a is integrally formed on the outer periphery of one end of the brake drum 1, or a ring-shaped member (aluminum Attach the Youmu Band) 2 by press-fitting, etc.
There are some that are designed to enhance the heat dissipation effect. In addition, in FIG. 9, 3 is a bearing member, and 4 is a spoke plate.

(Problem that the invention attempts to solve) However, in conventional drum brakes,
Due to the difference in coefficient of thermal expansion caused by the difference in material between the brake drum and the ring-shaped member, for example, even if the ring-shaped member is press-fitted onto the brake drum at room temperature, as the temperature of the brake drum increases, the brake drum and the ring-shaped member will There was a tendency for a gap to occur between the ring-shaped member and the ring-shaped member to move in the axial direction and circumferential direction, making it easy for looseness to occur between them.

Therefore, even if a gap occurs between the brake drum and the ring-shaped member due to high temperatures, the present invention restricts the movement of the ring-shaped member to prevent play between them, thereby improving strength and marketability. The purpose is to achieve this goal.

(Means for Solving Problems and Their Effects) The drum brake of the present invention has a protrusion integrally formed on the outer periphery of one end of the cylindrical brake drum, and a protrusion that fits on the outer periphery of the brake drum. A metal ring-shaped member having a portion is mounted around the ring, and one end of the ring-shaped member is locked by the protrusion. Further, a locking member is provided on the outer periphery of the other end of the brake drum to fit into the fitting portion of the ring-shaped member and to lock the other end of the ring-shaped member. Therefore, one end of the ring-shaped member is locked by the protrusion and the other end is locked by the locking member, so that movement in the axial direction is restricted, and the ring-shaped member Since the locking member is fitted to the fitting part, movement in the circumferential direction is restricted, and even if there is a gap between the brake drum and the ring-shaped member, no play will occur between them. .

(Example) An example of the present invention will be described below based on the drawings. Note that the same parts as in the conventional example will be described with the same reference numerals.

First, a first embodiment will be described based on FIGS. 1 to 3.

In the drum brake of this embodiment, as shown in FIG. 1, a cylindrical steel brake drum 1 is concentrically arranged around an axle 3, and the brake drum 1 is fixed to the axle 3. . A protrusion 1a is integrally formed on the outer periphery of one end of the brake drum 1 in order to enhance the heat dissipation effect. Further, in order to absorb and dissipate heat generated due to friction between the brake drum 1 and the brake shoe (not shown), an aluminum ring-shaped member (aluminum band) 2 is wrapped around the outer periphery of the brake drum 1. There is. As shown in FIG. 2a, this ring-shaped member 2 is formed into a cylindrical body, and a plurality of grooves 2a (fitting portions) along the axial direction are provided on the outer circumference of the ring-shaped member 2 in the circumferential direction. This ring-shaped member 2 is press-fitted around the outer periphery of the brake drum 1, and is attached such that one end of the ring-shaped member 2 is latched to the protruding portion 1a of the brake drum 1. Further, a locking member 5 is provided on the outer periphery of the other end of the brake drum 1 . This locking member 5 is made of the same material as the brake drum 1, and as shown in FIG. It is formed into a cylindrical shape that can be fitted. The locking member 5 is press-fitted onto the outer periphery of the other end of the brake drum 1 after the ring-shaped member 2 is press-fitted onto the outer periphery of the brake drum 1.
The other end of this locking member 5 is spot-welded to the brake drum 1 and spoke plate 4 at several locations around the circumference. Further, as shown in FIG. 3, the locking member 5 is fitted into the groove (fitting portion) 2a of the ring-shaped member 2 by being crimped at a plurality of locations around its circumference.

Therefore, one end of the ring-shaped member 2 is locked by the protrusion 1a, and the other end is locked by the locking member 5, so that movement in the axial direction is prevented. In addition, the groove (fitting part) 2 of the ring-shaped member 2
Since the locking member 5 is fitted to a, the movement of the ring-shaped member 2 in the circumferential direction is prevented, and as a result, the separation between the brake drum 1 and the ring-shaped member 2 due to the difference in thermal expansion is prevented.
Even if a gap occurs, play between the brake drum 1 and the ring-shaped member 2 can be prevented from occurring.

Next, a second embodiment will be explained based on FIGS. 4a to 5.

In this embodiment, as shown in FIG.
a, one end of this cylindrical body 6a is provided with a disk-shaped flange portion 6b, and a plurality of claw portions 6c that are fitted into the grooves 2a of the ring-shaped member 2 are provided on the outer periphery of the flange portion 6b. The structure is designed to accommodate spacing.
After the locking member 6 is fitted onto the outer periphery of the brake drum 1, as shown in FIGS. 4b and 5,
The claw portion 6c is bent into the groove 2a of the ring-shaped member 2. Therefore, in this embodiment as well, the ring-shaped member 2 is locked at both ends by the protruding portion 1a and the locking member 6, and the bent claw portion 6c fits into the groove 2a of the ring-shaped member 2. Since the ring-shaped member 2 is fitted with the ring member 2, it is possible to prevent the ring-shaped member 2 from moving in the axial direction and the circumferential direction when the brake temperature is high.

Next, a third embodiment will be explained based on FIGS. 6a and 6b.

In this embodiment, as shown in FIG.
A, the other end of this cylindrical body 7a is provided with a flange portion 7b, and the outer peripheral portion of this flange portion 7b is provided with a claw portion 7c that fits into the groove 2a. Also,
As shown in FIG. 6b, the inner periphery of the other end of the ring-shaped member 2 is formed to have an inner diameter into which the cylindrical body 7a of the locking member 7 can be inserted. Therefore, when assembling the locking member 7, the cylindrical body 7a of the locking member 7 is press-fitted onto the inner periphery of the other end of the ring-shaped member 2 press-fitted onto the outer periphery of the brake drum 1. By bending the portion 7c and fitting it into the groove 2a, the same effect as in the above embodiment can be obtained.

Next, a fourth embodiment will be explained based on FIGS. 7a and 7b.

In this embodiment, as shown in FIG. 7a, the locking member 8 is formed as a disc 8a having an inner diameter that can be fitted to the outer periphery of the brake drum 1, and is provided at multiple locations on the outer periphery of the disc 8a. It has a structure in which a claw portion 8b is provided. As shown in FIG. 7b, this locking member 8 press-fits the disc 8a onto the outer periphery of the brake drum 1, and abuts the other end of the ring-shaped member 2, so that the disc 8a and the brake drum 1 are Spot welding is performed at several locations in the circumferential direction, and the claw portions 8b are bent and fitted into the grooves 2b.

Next, a fifth embodiment will be explained based on FIGS. 8a and 8b.

In this embodiment, the locking member 9 is formed into a cylindrical body 9a whose one end can be fitted onto the outer periphery of the ring-shaped member 2 and whose other end can be fitted onto the outer periphery of the brake drum 1, as shown in FIG. 8a. ing. In addition, the cylindrical body 9a
At the other end, claw portions 9b that protrude along the axis of the cylindrical body 9a are provided at several locations in the circumferential direction. Such a locking member 9 press-fits the cylindrical body 9a onto the outer periphery of the brake drum 1, and
It abuts the other end of the ring-shaped member 2, and one end of the cylinder 9a is crimped into the groove 2a and fitted, while the claw portion 9b is welded to the brake drum 1 and the spoke plate 4. You can get the same effect.

In the above-mentioned second, third and fourth embodiments, the ring plate has a structure in which the claw part is fitted into the fitting part, but as in the first and fifth embodiments, the claw part is fitted into the fitting part of the ring plate. They may be fitted together. Furthermore, in the second, third and fourth embodiments,
By welding the claw portion to the ring-shaped member, the movement of the ring-shaped member can be further ensured.

(Effect of the invention) As is clear from the above explanation, according to the invention,
Even if a gap occurs between the brake drum and the ring-shaped member due to the high temperature generated due to brake friction,
Since the ring-shaped member can be prevented from moving in the axial direction and the circumferential direction, it is possible to reliably prevent play between the ring-shaped member and improve the strength and marketability.

[Brief explanation of the drawing]

1 to 3 relate to a first embodiment of the drum brake of the present invention, in which FIG. 1 is a longitudinal cross-sectional view showing a brake drum broken in half, FIG. 2a is a perspective view of a ring-shaped member, and FIG. FIG. 2b is a perspective view of the locking member, FIG. 3 is a sectional view taken along the arrow - in FIG. 1 showing the fitting part, and FIGS. Fig. 4a is a perspective view of the locking member, Fig. 4b is a plan view extracting the fitting part, Fig. 5 is a vertical sectional view showing the main parts of the brake drum, and Figs. 6a and b are According to the third embodiment of the present invention, FIG. 6a is a perspective view of the locking member;
FIG. 6b is a longitudinal sectional view showing the main parts of the brake drum, and FIGS. 7a and b relate to the fourth embodiment of the present invention.
FIG. 7a is a perspective view of the locking member, FIG. 7b is a longitudinal sectional view showing the main parts of the brake drum, FIGS. 8a and b relate to the fifth embodiment of the present invention, and FIG. FIG. 8B is a perspective view of the locking member, FIG. 8B is a vertical cross-sectional view showing essential parts of the brake drum, and FIG. 9 is a vertical cross-sectional view showing a conventional brake drum broken in half. In the drawings, 1, 1a, . . . are brake drums and protruding parts, 2, 2a, . . . are ring-shaped members and their fitting parts, and 5, 6, 7, 8, 9, . . . are locking members.

Claims (1)

[Scope of utility model registration request] In a drum brake in which a metal ring-shaped member is encircled around the outer periphery of the brake drum, a protrusion that is engaged with one end of the ring-shaped member is formed on the outer periphery of one end of the brake drum, and the ring-shaped member A drum brake characterized in that a fitting portion is provided on the outer periphery of the brake drum, and a locking member that fits into the fitting portion and locks the other end of the ring-shaped member is provided on the outer periphery of the other end side of the brake drum. .