JPH1066303A - Brake structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the overall dimensions of the brake of a rotating shaft from the conventional example by making the brake manually controllable and releasable from a braking state by only rotating a knob section by constituting a rotor, a floating plate, and a guide pin so that they can be moved in the axial direction when the knob section is turned. SOLUTION: When a knob section 7 is turned in one direction, a rotor 3 moves inward and a floating plate 15 and a guide pin 19 move inward through an initially coned disc spring 18. When the pin 19 moves, the front end of the pin 19 pushes a brake pad 6 inward and the pad 6 is separated from a brake disc 5, resulting in a non-braking state where a rotating shaft 12 can freely rotates. When the knob section 7 is turned in the opposite direction, on the contrary, the rotor 3 moves outward and the floating plate 15 and guide pin 19 move outward through a C-type washer 16. Consequently, the pin 19 is separated from the brake pad 6 and comes into contact with the brake disc 5, resulting in a braking state where the shaft 12 is braked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake structure, and more particularly to a brake structure which allows manual braking and release of braking of a rotating shaft only by rotating a knob portion, and makes the overall shape smaller than before. Regarding new improvements.

[0002]

2. Description of the Related Art Conventionally, as a brake structure of this kind used, for example, the structure shown in FIGS. 3 and 4 has been adopted. That is, in the case of the configuration shown in FIG. 3, a rotor 4 having a spline hub 3 is rotatably provided with respect to a stator 2 having a coil 1 as an electromagnetic drive unit,
The rotation shaft of a motor (not shown) is fitted to and connected to the rotor 4. A brake pad 6 is provided on both sides of the brake disk 5 of the rotor 4, and the brake pad 6 is provided by a release pin 8 which is connected to a release lever 7 rotatably provided at an outer peripheral position of the stator 2. The brake disk 5 is configured to be able to select a braking state and a non-braking state. Therefore, when the release lever 7 is rotated in the direction of arrow A in the state shown in FIG. 3, the end 7a of the release lever 7 comes into contact with the stator 2 and the release pin 8 moves the brake pad 6 in the axial direction. The braking state between the pad 6 and the brake disc 5 is released. In the case of the conventional configuration shown in FIG. 4, the basic structure is the same as that of FIG. 3, but the operation is completely the same except for the structure of the end 7a of the release lever 7. Are denoted by the same reference numerals, and description thereof is omitted.

[0003]

Since the conventional brake structure is configured as described above, there are the following problems. That is, when the release lever is rotated, braking on the brake disk can be released, but since the release lever returns to its original state when the hand is released, it is impossible to continue the released non-braking state. . Also, since the release lever has a semicircular shape as a whole, it has a shape protruding from the brake main body, and when the brake main body is mounted on the motor, a part of the release lever protrudes, resulting in a functional and external appearance. Was also disadvantaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In particular, the present invention enables manual braking and release of braking of a rotating shaft only by rotating a knob portion, and reduces the overall shape to a conventional shape. It is an object of the present invention to provide a brake structure that is smaller than the brake structure.

[0005]

According to the present invention, there is provided a brake structure comprising a brake pad provided in the casing and capable of being returned by an electromagnetic drive unit, with respect to a brake disk of a rotating shaft rotatably provided in the casing. The brake disk is brought into a braking state by being pressed by a spring in the electromagnetic drive unit, and the brake pad is returned by driving the electromagnetic drive unit against the spring force of the spring to bring the brake disk into a non-braking state. In a brake structure having a structure, a stator fixed to the casing and having a first threaded portion on an inner periphery, a rotor coaxially arranged on an inner periphery of the stator and screwed with the first threaded portion, and an outer periphery of the stator A knob portion coaxially arranged, a floating plate having an outer diameter larger than that of the stator and concentrically arranged on the rotor,
A guide pin provided on the floating plate and capable of abutting on the brake pad is provided, and the rotor, the floating plate and the guide pin can be moved in the axial direction by rotation of the knob portion.

More specifically, an O-ring is provided between the stator and the knob.

[0007] More specifically, the rotor and the knob portion are configured integrally or separately.

[0008] More specifically, a disc spring is provided between the rotor and the floating plate.

More specifically, the knob portion is provided with a spring plunger for contacting a concave portion formed on the outer periphery of the stator.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a brake structure according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. 1 and 2 is a known electromagnetic drive unit 10 provided on a casing 11.
The brake pad 6 provided on the electromagnetic drive unit 10 is always urged to the right in FIG. 1 by a spring (not shown) provided in the electromagnetic drive unit 10 as is well known. When the electromagnetic drive unit 10 is turned on, the brake pad 6 is sucked against the spring force of the spring and can be returned.

A rotary shaft 12 having a brake disk 5 is rotatably provided in the casing 11 in a state adjacent to the electromagnetic drive unit 10.
Is connected to a shaft of a motor (not shown). The brake disk 5 is disposed corresponding to the brake pad 6, and the brake pad 6 is always in contact with the brake disk 5 by the spring force of the spring (the state of FIG. The brake pad 6 is separated from the brake disk 5 by turning on the drive unit 10 or pressing a guide pin 19 described later,
Is turned on).

A stator 2 having a ring shape as a whole is disposed coaxially with the rotary shaft 12 in the casing 11, and a first screw portion 13 formed on the inner periphery of the stator 2 is provided.
, A rotor 3 coaxially arranged with the stator 2 is screwed into the second screw portion 1 formed on the outer periphery of the rotor 3.
4 is screwed with the first screw portion 13. The rotor 3
A floating plate 15 having a T-shaped cross section is provided at the axial center of the shaft 3. The shaft 15a of the floating plate 15 is connected to the rotor 3 via a C-type washer 16 and a stepped portion 17. A disc spring 18 is provided between the floating plate 15 and the rotor 3 in the axial direction, and is configured to absorb backlash between the floating plate 15 and the rotor 3.

A guide pin 19 is provided at one end of the floating plate 15.
Are provided along the axial direction.
Is configured to be able to freely contact and separate from the brake pad 6. A knob 7 having a substantially U-shaped cross section is rotatably provided on the outer periphery of the stator 2, and the knob 7 and the rotor 3 are configured to be integrated by a connecting pin 20. ing. When the knob portion 7 and the rotor 3 are separately formed as described above, this is to facilitate positioning when forming a display on the knob portion 7. It is also possible. Further, the knob portion 7 has a holding hole 21 formed in the radial direction thereof, and a well-known spring plunger 22 is provided in the holding hole 21. The ball 23 of the spring plunger 22 2
It is configured such that the knob portion 7 can be positioned at the time of rotation by being brought into contact with a plurality of concave portions 24 formed on the outer periphery of the knob 7 in a state of fitting. An O-ring 30 for waterproofing is provided between the stator 2 and the knob 7.

Next, the operation will be described. First, in the state of FIG. 1, the rotor 3 moves inward by rotating the knob 7 in one direction, and the floating plate 15 and the guide pin 19 move inward (left side in FIG. 1) via the disc spring 18. , The tip of the guide pin 19 presses the brake pad 6 inward, the contact between the brake pad 6 and the brake disc 5 is released, and the rotating shaft 12 is in a non-braking state in which the rotating shaft 12 can rotate freely.

Contrary to the above, when the knob 7 is rotated in the reverse direction in the state of FIG. 1, the rotor 3 moves outward (to the right in FIG. 1), and the floating plate 15 moves through the C-type washer 16. And the guide pin 19 moves outward, so that the guide pin 1
The contact between the brake pad 9 and the brake pad 6 is released, and the brake pad 6 is pushed outward by a spring (not shown) in the electromagnetic drive unit 10 to contact the brake disc 5 to rotate the rotating shaft 1.
The rotation of No. 2 is disabled, and a braking state is set. In the braking and non-braking states described above, the knob 7 is provided with the recess 24.
And the spring plunger 22 maintains the stopped state at that rotational position, and can maintain the previous state until the knob 7 is rotated again. In addition, even while the rotating shaft 12 is rotating, the rotating shaft 12 can be manually braked only by the rotation of the knob 7.

[0016]

Since the brake structure according to the present invention is configured as described above, the following effects can be obtained. That is, the brake can be freely and manually braked and released (non-braked) only by rotating the knob. Further, since the spring plunger is provided on the knob, the state of braking or non-braking can be continued. Further, since the diameter of the knob portion is smaller than that of the casing, it is possible to achieve a significant reduction in size as compared with the related art, without increasing the overall shape unlike the conventional release lever.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a brake structure according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a partially cutaway sectional view showing a conventional brake structure.

FIG. 4 is a partially cutaway sectional view showing another example of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Stator 3 Rotor 5 Brake disk 6 Brake pad 7 Knob part 10 Electromagnetic drive part 11 Casing 12 Rotary shaft 13 First screw part 15 Floating plate 18 Disc spring 19 Guide pin 22 Spring plunger 24 Recess

Claims (5)

[Claims] An electromagnetic drive unit (10) provided in the casing (11) can return to a brake disc (5) of a rotating shaft (12) rotatably provided in a casing (11). The brake pad (6) is pressed by a spring in the electromagnetic drive unit (10) to bring the brake disc (5) into a braking state, and the brake pad (6) is driven by the electromagnetic drive unit (10). In a brake structure in which the brake disc (5) is returned to a non-braking state by returning against a spring force of a spring, the brake structure is fixed to the casing (11) and has a first screw portion (13) on an inner periphery. A stator (2) and the stator
A rotor (3) coaxially arranged on the inner periphery of (2) and screwed with the first screw portion (13); a knob (7) coaxially arranged on the outer periphery of the stator (2); A floating plate (15) having an outer diameter larger than that of the stator (2) and concentrically disposed on the 3), and a guide pin (19) provided on the floating plate (15) and capable of contacting the brake pad (6). And a structure in which the rotor (3), the floating plate (15) and the guide pin (19) can be moved in the axial direction by rotation of the knob (7). 2. The brake structure according to claim 1, wherein an O-ring (30) is provided between the stator (2) and the knob (7). 3. The brake structure according to claim 1, wherein the rotor (3) and the knob (7) are formed integrally or separately. 4. The brake structure according to claim 1, wherein a disc spring (18) is provided between the rotor (3) and the floating plate (15). . 5. The stator (2) is provided on the knob (7).
The brake structure according to any one of claims 1 to 4, further comprising a spring plunger (22) for contacting a concave portion (24) formed on an outer periphery of the brake.