JP2002327779A - Brake for driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake having a simple constitution for a driving machine by which an excessive torque caused by a brake torque at the braking operation in an abnormal stop is not generated in a driven body. SOLUTION: A frictional coefficient between the second braking face 15 of a braking body 13 and the concaved curved face 10 of a braking arm 6 is set smaller than the frictional coefficient between the first braking face 14 of a braking body 13 fitted to the braking arm 6 and the circumferential face 3 of a brake wheel 2. In this way, the second braking face 15 slides on the concaved curved face 10 and hits a stopper and stops. Thereafter, a braking action caused by the friction between the first braking face 14 and the circumferential face 3 is generated. Accordingly, a moderate deceleration corresponding to the two stages of braking action by the first braking face 14 and the second braking face 15 is generated on a braked body driven by a drive, and hence, an inconvenience which gives an unpleasant feeling to passengers in the driven body by the impulse caused by an abrupt brake is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an elevator,
The present invention relates to a braking device for a driving machine mounted on a passenger conveyor or the like.

[0002]

2. Description of the Related Art As a conventional braking device for a driving machine, there is, for example, a structure disclosed in Japanese Patent Application Laid-Open No. 5-139678.
That is, a braking device of a driving machine such as an elevator is designed to generate a braking torque capable of obtaining a required holding force when performing a braking operation under a full load.

[0003] For this reason, at the time of an abnormal stop due to the occurrence of a failure, an excessive deceleration acts on a driven body such as an elevator car due to a braking torque of a braking device, and an impact is generated. There is a problem to give. For such a problem, a shock absorber composed of an attenuation damper is provided to reduce the deceleration acting on the driven body at the time of stop due to the occurrence of an abnormality by slowing down the operation of the brake body pressing the brake wheel. I have.

[0004]

In the above-described conventional braking device for a driving machine, a shock absorber is provided in the pressing mechanism of the braking body, so that the structure is complicated, the required space for installation is increased, and maintenance is troublesome. And the manufacturing cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a simple structure and suppresses occurrence of excessive deceleration acting on a driven body by a braking torque of a braking device during abnormal stop. It is an object of the present invention to obtain a braking device for a driving machine.

[0006]

In a braking device for a driving machine according to the present invention, a braking wheel fixed to a rotating shaft of the driving machine and a braking wheel disposed opposite to a circumferential surface of the braking wheel. A concave arm corresponding to the circumferential surface of the braking wheel is formed on a surface facing the circumferential surface of the brake arm, and a braking arm displaced in the circumferential surface direction of the braking wheel when necessary, and a braking arm provided on the braking arm Is held movably in the circumferential direction of the circumferential surface of the braking wheel through the concave curved surface of the braking wheel, a first braking surface is formed on one surface facing the circumferential surface of the braking wheel, and the concave curved surface of the braking arm. A braking body having a second braking surface having a smaller friction coefficient with respect to the concave curved surface of the braking arm than the friction coefficient between the circumferential surface of the braking wheel and the first braking surface on the other surface facing the braking wheel; A blocking body formed on the arm to prevent circumferential movement of the braking wheel of the braking body on the concave curved surface of the braking arm at a predetermined position. Eclipsed.

In the braking device for a driving machine according to the present invention, one end is engaged with the braking arm, and the other end is engaged with the braking arm. A neutral position holder is provided which is made of an elastic body and elastically holds the brake at a predetermined position in the longitudinal direction of the brake arm.

[0008] In the braking device for a driving machine according to the present invention, a support body having a brake body fixed to one end, inserted into the brake arm and movably mounted in the longitudinal direction of the brake arm,
A holding spring that is engaged with the support and presses the braking body against the braking arm via the support is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 5 are views showing an example of an embodiment of the present invention. FIG. 1 is a partially cutaway front view, FIG. 2 is a side view of main parts of FIG. 1, and FIG. FIG. 4 is a diagram showing a braking state of the braking device of FIG. 1, and FIG. 5 is a graph showing operating characteristics of the braking device of FIG. In the drawing, reference numeral 1 denotes a fixed body constituting a main part of the driving machine, 2 denotes a braking wheel fixed to a rotating shaft (not shown) which is pivoted by the fixed body 1 and 3 denotes a circumferential surface of the braking wheel 2 It is.

Reference numeral 4 denotes an electromagnet device provided on the fixed body 1;
Is an operating rod driven by a plunger (not shown) of the electromagnet device 4, 6 is a braking arm disposed on both sides of the circumferential surface 3 of the braking wheel 2, and the lower end is pivotally supported on the fixed body 1 by a pin 7. An opposing portion 8 fastened to the operating rod 5 is formed at the upper end, and a longitudinal middle 9 is disposed along the circumferential surface 3.

Reference numeral 10 denotes a concave curved surface, which is provided at the center in the longitudinal direction of the longitudinal middle 9 of the braking arm 6 and has a bottom surface of a groove-like portion receded from the longitudinal middle 9 surface and has a shape corresponding to the circumferential surface 3. It is formed on a curved surface. Reference numeral 11 denotes a blocking body formed by a retreating surface forming the longitudinal end of the concave curved surface 10, and 12 is provided at the center of the width of the concave curved surface 10 and is disposed corresponding to the longitudinal length of the concave curved surface 10, from the outer surface of the braking arm 6. It is a slot formed penetrating to the concave curved surface 10 side.

Reference numeral 13 denotes a braking body fitted in the groove-shaped portion of the circumferential surface 3 and slidably mounted in the longitudinal direction, and a first braking surface formed of a brake lining on one surface facing the circumferential surface 3. 1
4 is formed, and on the other surface which is fitted into the groove-shaped portion of the circumferential surface 3 and faces the concave curved surface 10, the friction coefficient between the circumferential surface 3 and the first braking surface 14 is smaller than that of the concave surface 10. On the other hand, a second braking surface 15 having a small coefficient of friction is formed.

Reference numeral 16 denotes a support made of a pin with a head, which is inserted from the outside of the braking arm 6 into the slot 12 with a gap formed therebetween, and the tip of which is fitted to the braking body 13. Reference numeral 17 denotes a connecting rod, which is inserted into the opposing portions 8 of the braking arms 6 on both sides facing each other with a gap therebetween. Reference numeral 18 denotes a nut screwed into one insertion end of the connecting rod 17, and 19 denotes a spring receiver fitted to the other insertion end of the connecting rod 17.

Reference numeral 20 denotes a nut which is screwed into the other insertion end of the connecting rod 17 and is disposed closer to the tip than the spring receiving member 19, and 21 is a braking spring made of a compression coil spring. It is arranged between the spring support 19 and the facing portion 8 of the braking arm 6 facing the spring support 19.

In the braking device for a driving machine configured as described above, when the elevator or the like is stopped, that is, when the driving machine is deenergized, the electromagnet device 4 is also deenergized, and the operating rod 5 is disposed at the retracted position. As a result, the braking arms 6 on both sides are urged in a direction approaching each other by the pressing force of the braking spring 21, and the braking body 13 is pressed against the circumferential surface 3 of the braking wheel 2 to brake the rotation of the braking wheel 2. .

During operation of an elevator or the like, the driving machine is energized, and the electromagnet device 4 is also energized. As a result, the operating rod 5 moves forward against the pressing force of the brake spring 21 and presses the brake arms 6 on both sides in a direction away from each other.
As a result, the braking body 13 separates from the circumferential surface 3 of the braking wheel 2 and the braking is released, and the braking wheel 2 rotates, that is, the driving machine operates to operate the elevator or the like.

When the elevator during operation is stopped, the driving machine is deenergized and the electromagnet device 4 is also deenergized, and the brake 13 is pressed against the circumferential surface 3 of the brake wheel 2 as described above. . At this time, the friction coefficient between the concave curved surface 10 of the braking arm 6 and the second braking surface 15 is set smaller than the friction coefficient between the circumferential surface 3 and the first braking surface 14. For this reason, in the initial stage of the pressing operation of the braking body 13, the second braking surface 15 slides on the concave curved surface 10, and the braking body 13 moves, and the torque A shown in FIG. 5A is generated.

For example, when the braking wheel 2 is rotating in the direction of arrow R shown in FIG.
FIG.
In the state shown in FIG. 5, a torque B shown in FIG. 5A is generated due to friction between the circumferential surface 3 and the first braking surface 14. As a result, the rotation speed of the braking wheel 2 is reduced as shown in FIG. 5B, and the deceleration of the elevator, ie, the driven body, of the elevator driven by the driving machine provided with the braking wheel 2 is shown in FIG. 5 (c).

As described above, a braking device designed to generate a braking torque capable of obtaining a required holding force when a braking operation is performed in a driving machine such as an elevator or the like under a full load is provided. When the elevator stops, it operates as described below. That is, a slow deceleration corresponding to the two stages of the torque A and the torque B acts by the operation of the braking device.

Therefore, like a braking device in which a braking body is fixedly attached to the braking arm 6, a two-stage braking action is generated for a one-stage operation characteristic shown by a broken line C in FIG. Excessive deceleration does not act on the driven body during operation of the device. For this reason, it is possible to eliminate a problem that an impact is generated by the operation of the braking device at the time of an abnormal stop due to the occurrence of a failure, and the passenger of the driven body feels uncomfortable.

Embodiment 2 FIG. 6 to 8 are views showing an example of another embodiment of the present invention. FIG. 6 is a diagram corresponding to FIG. 1 described above, FIG. 7 is a side view of a main part of FIG. 6, and FIG. FIG. In the drawings, the same reference numerals as those in FIGS. 1 to 5 denote the corresponding parts, and 22 is a neutral position holding body, which is constituted by an elastic body made of a compression coil spring, is provided in the slot 12 and has a One of the longitudinal ends is engaged with the longitudinal end surface of the slot 12 and the other end is engaged with the side surface of the support 16.

Reference numeral 23 denotes a washer which is fitted into the support 16 with a gap formed therebetween and is disposed between the outer surface of the braking arm 6 and the head of the support 16. Reference numeral 24 denotes a holding spring, which is formed of a compression coil spring, is fitted to the support 16, is disposed between the head of the support 16 and the washer 23, and presses the brake 13 against the concave curved surface 10.

In the braking device for a driving machine configured as described above, the coefficient of friction between the first braking surface 14 of the braking body 13 and the circumferential surface 3 is larger than that of the second braking surface 15 of the braking body 13. The friction coefficient between the concave curved surfaces 10 of the braking arm 6 is set small. As a result, a slow deceleration corresponding to the two stages of the torque A and the torque B described above acts by the operation of the braking device. Therefore, detailed description is omitted, but FIGS.
In this embodiment, the same operation as in the embodiment shown in FIGS. 1 to 5 can be obtained.

In the embodiment shown in FIGS. 6 to 8,
Both sides of the support 16 are pressed by the neutral position holder 22, and the support 16 moves to the longitudinal middle position of the slot 12 when the electromagnet device 4 is biased, that is, when braking is released. Thereby, regardless of the rotation direction of the braking wheel 2, the braking body 13
Slides on the concave curved surface 10 of the braking arm 6 and hits the blocking body 11 to stop. Thereafter, a braking action is generated by friction between the first braking surface 14 of the braking body 13 and the circumferential surface 3.

Therefore, the required braking action by the braking body 13 can be easily obtained. In addition, the brake 13 is held by the brake arm 6 in a pressed state via the support 16 by the holding spring 24. Therefore, during the braking operation, the brake 13
Moves in a stable state with respect to the braking arm 6 and is pressed against the braking wheel 2, so that a normal braking action can be reliably obtained.

[0026]

According to the present invention, as described above, the braking wheel fixed to the rotating shaft of the driving machine and the braking wheel disposed opposite to the circumferential surface of the braking wheel and facing the circumferential surface of the braking wheel are opposed to each other. A braking arm corresponding to the circumferential surface of the braking wheel is formed on the surface, and a braking arm that is displaced in the circumferential surface direction of the braking wheel when necessary, and braking is performed via the concave curved surface of the braking arm provided on this braking arm. It is held movably in the circumferential direction of the circumferential surface of the wheel, a first braking surface is formed on one surface facing the circumferential surface of the braking wheel, and on the other surface facing the concave curved surface of the braking arm A braking body having a second braking surface having a smaller friction coefficient with respect to the concave curved surface of the braking arm than a friction coefficient between the circumferential surface of the braking wheel and the first braking surface; And a blocking body for preventing the braking wheel of the braking body on the curved surface from moving in the circumferential direction at a predetermined position.

In this configuration, the friction coefficient between the second braking surface of the braking body and the concave curved surface of the braking arm is set smaller than the friction coefficient between the first braking surface and the circumferential surface of the braking body. Thereby, at the time of operation of the braking device, the braking body slides on the concave curved surface of the braking arm by the second braking surface, hits the stopping body and stops,
Thereafter, a braking action occurs due to friction between the first braking surface of the braking body and the circumferential surface of the braking wheel. Therefore, a slow deceleration corresponding to the two-step braking action by the second braking surface and the first braking surface acts on the braked body driven by the driving machine. For this reason, excessive deceleration does not act on the driven body during the operation of the braking device, and an impact is generated by the operation of the braking device particularly at the time of abnormal stop due to a failure, which makes passengers of the driven body uncomfortable. This has the effect of eliminating the problems caused.

Further, as described above, the present invention is arranged such that the brake arm of the brake body is disposed on both sides of the braking arm in the longitudinal direction, and one end of the brake arm is connected to the brake body. And a neutral position holder for elastically holding the braking body at a predetermined position in the longitudinal direction of the braking arm.

As a result, both sides of the support in the longitudinal direction of the brake arm are engaged with the neutral position holder, and the support moves to the longitudinal middle position of the brake arm when the brake is released. For this reason, regardless of the rotation direction of the braking wheel during the braking operation,
The braking body slides on the concave curved surface of the braking arm and hits the blocking body and stops, and thereafter, a braking action occurs due to friction between the first braking surface and the circumferential surface of the braking body. Therefore, there is an effect that the achievement of the required braking action by the braking body is stabilized.

As described above, according to the present invention, a support having a brake body fixed at one end and inserted into the brake arm and movably mounted in the longitudinal direction of the brake arm is engaged with the support. And a holding spring for pressing the brake body against the brake arm via the support.

As a result, the brake body is held in a pressed state by the brake arm via the support by the holding spring. Therefore, during the braking operation, the braking body moves in a stable state with respect to the braking arm and is pressed against the braking wheel 2, so that a normal braking operation can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a front view showing a part of a braking device in a cutaway manner.

FIG. 2 is a side view of a main part of FIG.

FIG. 3 is a cross-sectional plan view of a main part of FIG. 2;

FIG. 4 is a diagram showing a braking state of the braking device of FIG. 1;

FIG. 5 is a graph showing operating characteristics of the braking device of FIG. 1;

FIG. 6 is a view showing a second embodiment of the present invention, and is a view corresponding to FIG. 1 described above.

FIG. 7 is a side view of a main part of FIG. 6;

FIG. 8 is a cross-sectional plan view of a main part of FIG. 7;

[Explanation of symbols]

2 braking wheel, 3 circumferential surface, 6 braking arm, 1
0 concave curved surface, 11 blocking body, 13 braking body,
14 first braking surface, 15 second braking surface, 16 support, 22 neutral position holder, 24 retaining spring.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F306 AA01 AA02 AA07 BA09 3F321 AA02 AA05 CA17 3J058 AA03 AA06 AA13 AA17 AA24 AA30 AA38 BA09 CA03 CA05 CB04 CC07 CC72 CC77 FA37 FA38 FA39

Claims (3)

[Claims] A braking wheel fixed to a rotating shaft of a driving machine;
A braking arm that is arranged to face the circumferential surface of the braking wheel and that has a concave curved surface corresponding to the circumferential surface on a surface facing the circumferential surface, and that is displaced in the circumferential surface direction when necessary; The braking arm is provided so as to be movable in the circumferential direction of the circumferential surface via the concave curved surface, a first braking surface is formed on one surface facing the circumferential surface, and A braking body having a second braking surface having a smaller friction coefficient with respect to the concave curved surface than the friction coefficient between the circumferential surface and the first braking surface is formed on the other surface facing the curved surface; And a blocking body for preventing the circumferential movement of the braking body on the concave curved surface at a predetermined position. 2. The brake arm of the brake body is disposed on both sides in the direction along the length of the brake body, one end of the brake arm is made of an elastic body engaged with the brake arm, and the other end is made of an elastic body engaged with the brake arm. 2. The braking device for a driving machine according to claim 1, further comprising a neutral position holding body that elastically holds a predetermined position in a longitudinal direction of the braking arm. 3. A support fixed to one end and inserted through the brake arm and movably mounted in the longitudinal direction of the brake arm, and engaged with the support via the support. 3. The braking device for a driving machine according to claim 1, further comprising a holding spring that presses the braking body against the braking arm.