JPH027295Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a band brake.

Conventional band brakes have the disadvantage of emitting unpleasant high-pitched noises because the lining presses against the entire surface of the brake drum at the same time during operation. On the other hand, Utility Model Application No. 53-36683 and Utility Model Application No. 54-58582 disclose drums in which the circumferential surface of the drum is discontinuous or has grooves, but these discontinuous portions have obvious grooves. Therefore, it is impossible to avoid the occurrence of abnormal noise and brake lock due to the lining being bitten.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and its purpose is to provide a band brake that does not concentrate the brake friction force on one point and does not generate unpleasant noises. The present invention achieves the above object in a band brake 3 of the type that stops the rotation of the brake drum 2 by the tightening action of the lining 1, and has a predetermined width on the circumferential surface 4 of the brake drum 2 to relieve the pressure of the lining 1. Concave surfaces 5 are provided at several locations at equal intervals, and the concave surfaces 5 are constructed by flat surfaces 6 that are partially planarized from the drum circumferential surface 4. Therefore, in the present invention, the concave surface 5 refers to the circumferential surface 4 of the brake drum 2.
It is more concave and has a width about the width of the drum as shown in the figure. Therefore, the concave surface 5 can be formed by grinding the peripheral surface of the drum 2, or by shaping the drum 2 at the same time as press-molding it.

The concave surface 5 in the illustrated embodiment corresponds to the drum peripheral surface 4
The case where the flat surface 6 is formed by processing (FIGS. 3 to 7) is shown. Since the surface 6 is flat, the concave surface 5 can be formed by simple grinding, and since the angle formed between the circumferential surface 4 in contact with the lining 1 and the concave surface 5 is extremely shallow, the lining 1 can come into contact with the flat surface 6 during braking. 6th
The one shown in FIGS. 4 and 7 differs from the one shown in FIGS. 4 and 5 in that the drum 2 has a flat surface 7 inclined from one side to the other. When the flat surface 7 is tilted, when the brake is applied, the lining 1 comes into pressure contact with the flat surface 7 from a shallow portion of the sloped flat surface 7 to a certain extent, so that the braking action is gradually performed, and as a result, brake noise is reduced. Note that the direction of inclination of the flat surface 7 does not have to be the same for all the recesses, and may be alternately set in opposite directions so that the tightening action is averaged. A plurality of concave surfaces 5 (in the embodiment, four concave surfaces are provided at equal intervals) on the circumferential surface of the drum.

8 in the figure is a brake main plate, one end of a band fitting 10 is fixed to the main plate 8 by a pin 9, and an L-shaped intermediate lever 1 is pivotally connected to the brake main plate 8 by a shaft 11.
The other end of the band metal fitting 4 is pivotally connected to one end of 2 with a pin 13, and the spring 14 is applied to the intermediate lever 12, and the intermediate lever 12 is operated against the spring 14 as shown by the chain line in FIG. The lining 1 presses against the surface of the brake drum 2 to stop the axle 15. 16 is a tension wire of the intermediate lever 12, 1
7 shows the body frame of the automobile.

As described above, in the present invention, the concave surface 5 is formed on a part of the circumferential surface 4 of the brake drum 2, so when the brake is applied, the lining 1 comes into contact with the circumferential surface 4 of the drum 2 excluding the concave surface 5, and the brake is applied. In this way, the brake drum and the axle 12 integrated therewith will stop, but since the drum circumferential surface 4 is provided with the concave surface 5, the contact surface of the lining 1 that tightens the drum circumferential surface 4 is Since the lining 1 is divided by the concave surface 5 and does not bite into the concave surface 5, the brake friction force is not concentrated in one part and the brake is applied gradually, so there is no extremely unpleasant high-pitched sound as in the past, and Since the brakes do not lock, they can be used comfortably for long periods of time. Moreover, its structure is extremely simple, and since it can be processed into a brake drum, it is easy to manufacture, and there is no problem with work efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the band brake according to the present invention. Fig. 1 is a side view, Fig. 2 is a vertical side view, Fig. 3 is a perspective view of the brake drum, and Fig. 4 is a view of the recess. FIG. 5 is a perspective view showing one example, FIG. 5 is a cross-sectional view of a main part thereof, and FIGS. 6 and 7 are a perspective view and a cross-sectional view showing other examples of the recessed portion. 1... Lining, 2... Brake drum, 3
...Brake, 4...Surrounding surface, 5...Concave surface, 6,7
...Flat surface.

Claims (1)

[Claims for Utility Model Registration] (1) In a band brake 3 of a type in which the rotation of the brake drum 2 is stopped by the tightening action of the lining 1, the peripheral surface 4 of the brake drum 2
In this band brake, concave surfaces 5 of a predetermined width are provided at approximately equal intervals in several places to relieve pressure on the lining 1, and the concave surfaces 5 are formed by flat surfaces 6 that are partially planarized from the drum circumferential surface 4. (2) The band brake according to claim 1 or 2, in which the concave surface 5 is inclined from one side of the brake drum 2 to the other side.