JPH051036U - Drum in disk - Google Patents

Abstract

(57) [Summary] [Purpose] Even if muddy water enters the ventilation holes of the drum-in disc, a stable brake braking force can be obtained on the drum and the life of the brake shoes is extended. [Structure] A vent hole 3 is provided in a disc portion 1 of a drum-in disc, and the vent hole 3 is formed so that a vent hole portion 3a in a radial direction and an annular vent hole portion 3b in an axial direction communicate with each other. An annular groove 4 is provided at a portion of the disk portion 1 where the pores 3a and 3b intersect. When the brake shoe 6 is engaged with the drum portion 2 and the rotation of the disc portion 1 is stopped, muddy water or the like that has entered the radial ventilation hole portion 3 a arranged above passes downward through the annular groove 4. It intrudes into the ventilation hole 3a in the radial direction arranged in the above, and then falls outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a drum-in disc.

[0002]

[Prior Art]

 As a conventional drum-in disc, there is one shown in Fig. 3 of Japanese Utility Model Laid-Open No. 1-178238, which has a vent hole in the disc portion, and the vent hole is a radial vent hole. Is formed so as to communicate with the annular vent hole portion in the axial direction, and an annular dust cover is arranged in the vicinity of the drum in disk, and the dust cover is inserted into the annular vent hole portion. An inner annular member is provided.

[0003]

[Problems to be solved by the device]

 In the conventional drum-in disc, when the brake shoe is engaged with the drum part and the rotation of the disc part is stopped, the muddy water, etc., that has entered the radial ventilation hole located above the annular ventilation hole There is a problem that it may reach the sliding surface of the drum part through the part, which reduces the braking force of the brake of the drum part and causes the brake shoes to easily rub. Therefore, the present invention has been made to solve such a problem, and provides a drum-in disk that can easily discharge muddy water or the like that has entered the ventilation holes of the disk portion in the radial direction to the outside.

[0004]

[Means for Solving the Problems]

 The drum-in disc of the present invention is provided with an annular groove at the portion of the disc portion where the radial vent hole portion and the axial vent hole portion intersect.

[0005]

[Action]

 When the brake shoe is engaged with the drum part to stop the rotation of the disc part, the muddy water that has entered the upper radial vent hole will pass through the annular groove and fall below the radius. Intrudes into the ventilation hole in the direction, and falls outside through the outer opening.

[0006]

【Example】

 FIG. 1 shows a drum-in disc according to the present invention, which comprises a disc portion 1 arranged on the outer side and a drum portion 2 arranged on the inner side. The air holes 3 are formed so that the radial air holes 3a and the axial air holes 3b communicate with each other, and the annular groove 4 is formed at the position of the disk portion 1 where the air holes 3a, 3b intersect. A dust cover 5 is provided in the vicinity of the drum-in disc, and the dust cover 5 partially covers the inner annular member 5a inserted into the annular ventilation hole 3b and the outer peripheral end surface of the disc portion 1. An outer annular member 5b is provided, and a brake shoe 6 is provided in the drum portion 2a so as to be engageable with the drum portion 2a.

When the brake shoe 6 is engaged with the drum portion 2 and the rotation of the disc portion 1 is stopped, the muddy water or the like that has entered the radial ventilation hole portion 3 a arranged above the annular groove 4 After passing through, the gas penetrates into the ventilation hole portion 3a in the radial direction disposed below and falls from the outside opening of the ventilation hole portion 3a to the outside. Further, muddy water or the like attached to the side wall of the vent hole portion 3a is discharged to the outside from the outer opening of the vent hole portion 3a by centrifugal force when the disc portion 1 rotates.

[0008]

[Effect of the device]

 According to the present invention, since the annular groove is provided at the portion of the disc portion where the radial ventilation hole portion and the axial annular ventilation hole portion intersect, muddy water and the like enter the sliding surface of the drum portion. The stable brake braking force is obtained in the drum section, and the life of the brake shoe is extended.

[Brief description of drawings]

FIG. 1 is a sectional view showing a drum-in disc according to the present invention.

[Explanation of symbols]

 1 Disc Part 3a Radial Vent Hole 3b Axial Circular Vent Hole 4 Annular Groove

Claims (1)

Claims for utility model registration Claims: 1. A drum-in disc having a disc portion provided with a vent hole communicating with a radial vent hole and an axial vent hole. A drum-in disc, wherein an annular groove is provided at a portion of the disc portion where the portions intersect.