JPH0141945Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is used in braking devices such as electric shutters that are operated by a single-phase induction motor through a multi-plate electromagnetic brake mechanism. This invention relates to a muffling device for abnormal brake noise caused by unevenness.

(Prior art) Conventionally, in single-phase induction motors equipped with multi-plate electromagnetic brakes used in electric shutters, etc., abnormal brake noise occurs due to uneven rotation.In order to eliminate this abnormal noise, Sound can be muted by attaching a flywheel to the rotating shaft of the electric motor to buffer uneven rotation, or by attaching cushion rubber to the brake cam fixed to the rotating shaft of the electric motor to eliminate the gap between the brake cam and the brake lining. I'm going.

(Problems to be solved by the invention) However, according to the former method, there are problems in that the inertia of the rotating shaft of the single-phase induction motor increases, which affects the brake torque, and that the brake lining wears out significantly. However, with the latter method, the rubber cushion constantly acts on the brake lining, and even when the electromagnetic brake is activated, the brake lining does not completely separate from the intermediate plate and the electromagnetic brake surface, which affects the rotational force of the electric motor. The dot was hot.

The present invention provides a silencing device for a brake system that eliminates such problems.

(Means for Solving the Problems) In order to achieve the above object, the silencer in the braking device of the present invention provides a brake on the rotating shaft 2 of the single-phase induction motor 1, as shown in the drawings corresponding to the embodiments. The cam member 3 is fixed, and this brake cam member 3
In a braking device in which a brake lining 5 of a multi-plate electromagnetic brake mechanism 7 is integrally and rotatably fitted, a groove 4 of an appropriate depth is provided on the outer circumference of the brake cam member 3, and in the groove 4, The brake lining retainer 6 is equipped with a brake lining retainer 6 which swings outward from the groove 4 due to the centrifugal force generated by the rotation of the rotary shaft 2 and comes into pressure contact with the inner circumferential surface of the brake lining 5.

(Function) When the single-phase induction motor 1 rotates, its rotating shaft 2
The brake cam member 3 fixed to rotates together,
The brake lining retainer 6 provided in the groove 4 provided on the outer circumference of the brake cam member 3 swings due to the centrifugal force generated by rotation, and presses its outer end surface against the inner circumferential surface of the brake lining 5. Prevent abnormal noise from occurring.

Furthermore, when the operation of the single-phase induction motor 1 stops, the centrifugal force acting on the brake lining presser 6 disappears, and the brake lining presser 6 loosely fits into the groove 4, restraining the brake lining 5. Never.

(Example) To explain the example of the present invention with reference to the drawings, 1
is a single-phase induction motor, and a brake cam member 3 is integrally fixed to its rotating shaft 2.

As shown in FIGS. 2a and 2b, this brake cam member 3 is formed in a frontal shape, and a square groove 4 of an appropriate depth is bored from the outer peripheral end face in the center of the straight side of the outer peripheral part. It has been set up. The square grooves 4 are provided at the center of different straight sides depending on the number of brake linings 5 used.

Reference numeral 6 denotes a brake lining retainer that is loosely fitted into the square groove 4 so as to be able to swing from side to side, and has a rectangular cross section with a slightly smaller width and height than the square groove 4, as shown in FIGS. 3a to 3c. A horizontally long eccentric plate part 6b bent inward along the front face of the brake cam member 3 is integrally provided on the lower surface of one end of the part 6a, and the other end is bent downward to engage with the back face of the brake cam member 3. It is formed in the locking portion 6c.

The presser part 6a of the brake lining presser 6 is formed at a portion facing the brake lining 5, and in the figure, two brake linings 5 are
The brake lining presser 6 shown in FIG. Brake lining presser foot 6 facing brake lining 5
As shown in FIGS. 4a to 4c, the presser part 6a
is provided on the locking portion 6c side, and the remaining portion is formed into a narrow rod portion 6d. Reference numeral 6e designates a locking pin located on a vertical line of the holding portion 6a or the rod portion 6d and protruding from the inner surface of the horizontally long eccentric plate portion 6b. The eccentric plate portion 6b is formed so that one side of the pin 6e is longer than the other side.

The brake lining 5 described above is formed in the shape of a disk, with a square hole 8 provided in the center thereof and slidably fitted loosely into the outer circumferential surface of the brake cam member 3.

Reference numeral 10 denotes a brake case whose open end is fixed to the motor rear cover 1a of the single-phase induction motor 1 with fixing screws 11. A partition wall 12 is integrally provided inside the brake case, and a brake shaft is mounted in the center of the partition wall 12. 13 is rotatably inserted and supported.

7 is an electromagnetic brake mechanism disposed on the inner surface of the partition wall 12, which includes an electromagnetic brake 14 made of an electromagnetic coil fixed to the inner surface of the partition wall 12;
The brake shaft 1 faces the brake shaft 1 such that it can freely approach and separate from the
A chain wheel 16 is attached to the tip of the electromagnetic brake 14 so as to be slidable only in the axial direction with a key 15, and an end plate 18 is fixed to the outer periphery of the electromagnetic brake 14 via several long screws 17. Several brake linings 5 and intermediate plates 19 are alternately arranged between the end plates 18 and the chain wheel 16, which face each other.

Reference numeral 20 denotes a collar fitted to the inner circumferential surface of the electromagnetic brake 14 so as to be slidable back and forth, and its center hole is fitted to the brake shaft 13 so as to be slidable. A spring 21 is press-fitted into the surface, and under normal conditions, the chain wheel 16 is pushed against the end plate 1 by the force of the spring.
The brake lining 5 and the intermediate plate 19 are pressed between the chain wheel 16 and the end plate 18 by pressing toward the 8 side, and the chain wheel 16 is slightly separated from the electromagnetic brake 14.

Reference numeral 22 denotes a locking pawl pivotally supported on the inner circumferential surface of the brake case 7 facing the outer circumferential surface of the chain wheel 16, and as is well known, the locking pawl 22 is connected to the serrated engagement teeth 23 formed on the outer circumferential surface of the chain wheel 16. The meshing allows the chain wheel 16 to rotate in only one direction.

Reference numeral 24 denotes a fixing pin protruding from the outer periphery of the chain wheel 16 toward the end plate 18, and a locking recess 2 provided at the outer periphery of the intermediate plate 19.
5 is engaged.

Reference numeral 26 indicates a manual operation chain that extends over the chain wheel 16, and reference numeral 27 indicates a brake lever that is loosely fitted to the other end of the brake shaft 13. The brake lever is sandwiched between the outer surface of the bulkhead 12 and a stopper 28 fixed to the brake shaft 13. The brake shaft 13 can be rotated using the contact portion with the brake shaft 12 as a fulcrum.
is moved in the axial direction.

Now, when the single-phase induction motor 1 is started and the winding drum (not shown) of the shutter connected to the motor 1 is rotated, voltage is applied to the electromagnetic brake 14 at the same time as the start, resisting the force of the spring 21. The chain wheel 16 is attracted to the opposite surface of the electromagnetic brake 14. Therefore, a gap is created between the brake lining 5, the intermediate plate 19, and the chain wheel 16, and the rotation of the rotating shaft 2 of the electric motor 1 causes the brake cam member 3 and the brake lining 5 to rotate integrally. When the brake cam member 3 rotates, the brake lining retainer 6 disposed in the square groove 4 rotates in the direction of the arrow due to the centrifugal force caused by the rotation of the cam member 3, as shown in FIG. A corner portion of the brake lining 6a protrudes from the square groove 4 and presses against the inner circumferential surface of the brake lining 5.

Therefore, there is no gap between the brake cam member 3 and the brake lining 5, and the abnormal noise generated by the gap disappears.

Next, when the single-phase induction motor 1 is stopped, the attraction force of the electromagnetic brake 14 is lost and the spring 2
The brake lining 5 is pressed against the end plate 18 side by one force, and the chain wheel 16 attempts to rotate due to the frictional force, but the engagement teeth 23 provided on the outer circumference of the chain wheel 16 are engaged with the locking pawls 22. As a result, rotation is blocked and the electric motor 1 stops instantaneously. When this electric motor 1 stops rotating, no centrifugal force acts on the brake lining presser foot 6, and the fifth
As shown in the figure, the presser portion 6a is housed in the square groove 4.

In this state, the brake lining presser foot 6 has no effect on the brake lining 5, so for example, in FIG. 1, the brake lever 27
When the brake shaft 13 is pulled downward against the force of the spring 21 and the chain wheel 16 is brought into close contact with the electromagnetic brake 14 to release the brake, the brake lining 5 comes into pressure contact with the intermediate brake 19 and the chain wheel 16. Since it is completely cut off, there is no problem in the rotation of the electric motor 1.

(Effects of the invention) As described above, according to the silencer in the braking device of the present invention, a groove 4 of an appropriate depth is provided on the outer periphery of the brake cam member 3 fixed to the rotating shaft 2 of the single-phase induction motor 1, A brake lining retainer 6 is installed in the groove 4 and swings outward from the groove 4 due to the centrifugal force caused by the rotation of the rotating shaft 2 to press against the inner circumferential surface of the brake lining 5. Therefore, when the single-phase induction motor 1 rotates, the brake lining retainer 6 presses against the inner circumferential surface of the brake lining 5 to eliminate the gap between the brake cam member 3 and the brake lining 5. This eliminates the occurrence of abnormal noise in the brake part due to uneven rotation of the single-phase induction motor 1, and enables smooth rotation transmission. Also, when the single-phase induction motor 1 is stopped, the brake lining presser 6 can stop the brake. The contact with the lining 5 is broken and the rotational force of the single-phase induction motor 1 is not adversely affected in any way.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional side view thereof, FIGS. 2 a and b are a side view and a front view of the brake cam member, and FIGS. 3 a-c and 4 a- c is a plan view, a side view, and a front view of the brake lining holder, and FIGS. 5 and 6 are front views showing the state of the brake lining holder when the single-phase induction motor is stopped and when it is rotating. 1...Single-phase induction motor, 2...Rotating shaft, 3...
Brake cam member, 4... Square groove, 5... Brake lining, 6... Brake lining presser, 9
...Multi-plate electromagnetic brake mechanism.

Claims (1)

[Scope of utility model registration request] A braking device in which a brake cam member 3 is fixed to the rotating shaft 2 of a single-phase induction motor 1, and a brake lining 5 of a multi-plate electromagnetic brake mechanism 7 is integrally and rotatably fitted onto the brake cam member 3, A groove 4 of an appropriate depth is provided on the outer circumference of the brake cam member 3, and the inner part of the brake lining 5 is formed in the groove 4 by swinging outward from the groove 4 due to the centrifugal force caused by the rotation of the rotating shaft 2. A noise muffling device for a braking device, characterized in that a brake lining presser 6 is installed inside the brake lining press 6 that presses against the circumferential surface of the brake lining.