JPH0131789Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking device that brakes a rotating body by locking a brake band wound around a brake drum and bringing it into sliding contact with the brake drum.

For example, as a braking device in a washing machine for dehydration and dehydration, a brake drum is connected to a rotating body for washing and dehydration, and an engaging protrusion that has an annular shape with an end and extends outward at one end is used. A brake band having bent portions is wrapped tightly around the outer peripheral surface of the brake drum, and a brake lever is provided so as to be removable from the engagement protrusion of the brake band. When the rotary tank is to be rotated, the brake lever is disengaged from the engaging protrusion, and the brake drum and the brake band are rotated in their original state, and the rotary tank is braked. When necessary, the brake lever is brought into contact with the engagement protrusion of the rotating brake band to stop the brake band, and the brake band is thereby brought into sliding contact with the rotating brake drum, thereby stopping the rotating tank. It seems to be braking. However, in this structure where the engaging protrusion is integrally provided at one end of the brake band, the protruding length of the engaging protrusion may be changed due to a slight manufacturing error of the brake band or a slight misalignment of the bending part. As a result, there was a problem in that the position of contact between the engagement protrusion and the brake lever varied, and the braking force also varied. In addition, when the engaging projecting piece and the brake band are integrally formed, a step of bending the metal plate material into an annular shape and a step of bending the end portions are required, so there is also the drawback that manufacturing is troublesome. Ta.

The present invention has been made in view of the above circumstances, and its purpose is to provide a braking device that can obtain a constant and stable braking force and is easy to manufacture.

An embodiment of the present invention will be described below with reference to the drawings. First, the drive portion of the dehydrating/washing machine will be described with reference to FIG. 1 is a water receiving tank, 2 is a rotating tank for washing and dewatering arranged inside the water receiving tank 1, 3 is a pulsator arranged at the inner bottom of the rotating tank 2, and 4 is a drive arranged at the outer bottom of the water receiving tank 1. It is a device. This drive device 4 is composed of a mechanism section 5, a drive motor 6, and a belt transmission mechanism 7 that connects these.As is well known, during washing, the rotation of the drive motor 6 is transmitted to the pulsator 3 via a washing shaft 8 to dehydrate the water. Sometimes, the water is transmitted to the rotating tank 2 via the dewatering shaft 9. Reference numeral 10 denotes a braking device for braking the rotating tank 2, which is a rotating body, and this will be described below with reference to FIGS. 1, 2, and 3. A brake drum 11 is fitted onto the dewatering shaft 9, and an escape recess 12 is formed continuously in the circumferential direction on its outer peripheral surface 11a. Reference numeral 13 denotes a brake band wound around the outer peripheral surface 11a of the brake drum 11 by its own spring force.
form annular shapes with ends facing each other at a predetermined interval.
A brake shoe 14 is attached to the inner surface of the brake band 13 and is pressed against the outer peripheral surface 11a of the brake drum 11. On the other hand, 15 is the mechanical part 5
This is a brake lever that is pivotally installed in the housing 5a (see FIG. 1) near the brake band 13, and has a distal end that can be inserted into and removed from the relief recess 12 by rotating the brake lever 15. An engaging pawl 16 is formed. A spring 17 is disposed at the base end of the brake lever 15 to urge the engagement pawl 16 to be inserted into the relief recess 12 at all times. An interlocking control wire 18 is connected, and as a result, the brake lever 15 engages the engaging pawl 16 when the opening/closing lid is closed.
is in a position where it is removed from the relief recess 12 (see solid lines in Figures 2 and 3), and as it opens, the third
When rotated in the direction of arrow A in the figure, the engaging pawl 16 is inserted into the escape recess 12 (see the two-dot chain line in FIGS. 2 and 3).

In the above configuration, when the rotating lid of the rotary tank 2 is opened, the brake lever 15 is rotated in the direction of arrow A, and the engaging pawl 16 is inserted into the escape recess 12. The engagement claw 16
comes into contact with and engages with one end surface 13a of the brake band 13 (see the two-dot chain line in FIG. 2), and due to this engagement,
Since the brake band 13, which had been rotating together with the brake drum 11, is stopped, the brake shoe 14 of the brake band 13 comes to fit into the outer peripheral surface 11a of the brake drum 11. As a result, the brake drum 11 is braked, thereby stopping the rotation of the rotary tank 2.

As described above, according to this embodiment, the brake band 1
Since the engaging pawl 16 is brought into direct abutment engagement with the one end surface 13a of the brake member 3, there is no variation in the abutting position, and thus a stable braking force can be obtained.
Further, according to this embodiment, there is no need to form an engaging protrusion on the brake lever 13 as in the conventional case, so manufacturing is easy. Further, according to this embodiment, the engaging claw 16 is inserted into and removed from the escape recess 12 of the brake drum 11, and the engaging claw 16 is engaged with one end surface 13a of the brake lever 13 at the time of insertion. , the tip of the engaging pawl 16 is located deeper than the one end surface 13a of the brake band 13 when engaged, so that even though the engagement is performed in a narrow range of the one end surface 13a of the brake band 13, Engagement can be performed reliably. There is a concern that the number of manufacturing steps will increase due to the provision of the escape recess 12 in the brake drum 11;
2, when molding the brake drum 11 by casting, it can be molded simultaneously with the same mold, so that the number of manufacturing steps does not increase.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be applied in various ways without departing from the gist, such as being applicable not only to dehydrating/washing machines but also to general braking devices for various types of equipment. Can be modified and implemented.

As explained above, the present invention consists of continuously forming relief recesses on the outer peripheral surface of the brake drum, and engaging the engaging pawl with one end surface of the brake band when the engaging pawl is inserted into the relief recess. Therefore, since the brake band is fitted to the brake drum, a constant and stable braking force can be obtained, and manufacturing is easy. Furthermore, since the above-mentioned engagement is performed at one end surface of the brake band, it is possible to obtain a constant and stable braking force. Nevertheless, it is possible to provide a braking device that can always perform the engagement reliably and obtain a reliable braking effect.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a longitudinal cross-sectional view showing the drive part of a washing machine with dehydrating function, Fig. 2 is an enlarged longitudinal cross-sectional view of the main part, and Fig. 3 is an enlarged plan view. be. In the figure, 2 is a rotating tank (rotating body), 10 is a braking device,
11 and 11a are a brake drum and its outer peripheral surface, 12 is a relief recess, 13 and 13a are a brake band and its one end surface, 14 is a brake shoe,
15 is a brake lever, and 16 is an engagement pawl.

Claims (1)

[Scope of utility model registration request] A brake drum that rotates together with the rotary body, an escape recess formed continuously on the outer circumferential surface of the brake drum, an annular brake band with an end wrapped around the outer circumferential surface of the brake drum, and a relief recess for the escape recess. A braking device comprising an engaging pawl that is removably installed and that engages one end surface of the brake band when inserted to bring the brake band into sliding contact with the brake drum.