JPS5911746A - Electromagnetic clutch motor - Google Patents

Abstract

PURPOSE:To prevent a buffer material from generating noise due to deterioration and deformation of the material by mounting a pin at least one of a bracket and a flywheel, and mounting a brake ring and a clutch ring via a steel ball on the pin. CONSTITUTION:A pin 13 is mounted on a continuous flywheel 4, and a clutch ring 15 is movably mounted axially in the stationary state in the rotating direction via a steel ball 18 or via a slide and the ball 18 on the pin 13. When the ring 15 thermally expands to increase the diameter of the pitch of the mounting hole 16, the variation in the diameter of the pitch can be absorbed by the movement of the ring 15 and the ball 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic machine having an electromagnetic power transmission mechanism.

As shown in FIGS. 1 and 2, a conventional electromagnetic clutch motor includes a clutch electromagnet 1. Brake electromagnets 2 are each fixed to a bracket 3, and a plurality of pins 5 are fixed to a flywheel 4 driven at a constant speed by a motor. Reference numeral 6 denotes a sliding metal bearing.A cushioning material, O-ring, is attached to the groove on its outer periphery, and it is lightly press-fitted into the hole of the clutch ring 8, so that it can move in the axial direction on the pin 5. A few words have been said. On the other hand, similarly to the clutch portion, a brake ring 9 is attached to a pin on the bracket 4 via a metal 11η11 receiver and an O-ring so as to be movable in the axial direction. A clutch rotor 12 having a lining 11 is fixed to the output shaft 10 .

When the clutch electromagnet 1 is energized, the magnetic flux passes through the magnetic path 101 and the clutch 8 is attracted, presses against the lining 11, and transmits rotational force to the output shaft 10. When the brake electromagnet 2 is still energized, the magnetic flux passes through the magnetic path 102, attracts the brake ring 9, contacts the lining 11 with the earth, and connects the output shaft 1Q.
suddenly decelerates and stops.

By the way, this type of electromagnetic clutch motor is often used as a drive source for industrial sewing machines, and since the pulsating torque is large, if the gap between the pin 5 and the metal bearing 6 is large, the noise due to vibration will be very high. Cheap.

Therefore, in order to reduce noise, the gap is made smaller, and an O-ring 7 is provided in the groove on the outer periphery of the metal bearing 6. The purpose of providing this O-ring is that even if the clutch ring 8 and brake ring 9 thermally expand due to the frictional heat of the lining 11 and the pitch diameter of the metal bridge 6 increases, the dimensional change will occur. The O-ring 7 absorbs the amount 7, prevents the metal bearing 6 and the bottle 6 from galling 7, and allows the clutch ring 8 and brake ring 9 to move smoothly with a small output and fully perform their functions. This is because there is.

As mentioned above, in the conventional example, the groove on the outer periphery of the metal bearing 6 is provided with a buffering effect, Q IJ NG Y, but this buffer material is meaningless unless it is made of a soft material such as an O-ring. Therefore, if used in an electromagnetic clutch motor that is used frequently and is subject to the effects of frictional heat, the cushioning material will deteriorate and deform within a relatively short period of time, causing it to lose its role as a buffer. This has the disadvantage that noise due to vibration is likely to occur again.

The invention is intended to overcome the above-mentioned drawbacks of the prior art, and the present invention will be described below with reference to FIGS. 3, 4 and 5 showing embodiments thereof. FIG. 3 is a sectional view of a main part showing an embodiment of the present invention, and is a side view of FIGS. In FIG. 3, a plurality of metal pins 13 are fixed with bolts 14 to a flywheel 4 that is driven at a constant speed by a motor. The clutch ring 16 has a plurality of holes 16 at positions facing the plurality of metal pins 13, and the holes 16iJ further have a groove 17 having a hemispherical cross section. The clutch ring 15 is attached to the metal pin 13 via a steel ball 18 so as to be movable in the axial direction. 1.Here, the diameter of the hole 16 is φ, the outer diameter of the metal bottle 13 is φB, the outer diameter of the steel ball 18 is φ
When the diameter of the C9 groove 17 is φD, the value of (D-B-C) is slightly larger than the value of (□). Therefore, metal pin 13
The gap between the hole 16, the groove 17, and the steel ball 18 is extremely small, and noise caused by vibration is extremely reduced.

Now, in FIG. 4, the metal pin 13 fixed to the flywheel 4 is attached in the S direction (
Considering the case where the clutch ring 16 is rotating in the S direction by the metal pin 13]01
However, the contact portion between the metal pin 13 and the hole 16 moves slightly in the counter-opening direction along the inner diameter surface of the hole 16, and moves to the left side of the center line xx'. At this time, the steel ball 18 simultaneously moves along the inner diameter surface of the groove 17, moves slightly in the anti-time opening direction, and moves to the right of the center lines x-, x'.

Then, the metal pin 13, the hole 16, the groove 1, and the steel ball 18 maintain a balance and are in a stable state.

Next, let us consider a case where the crassoting 15 thermally expands due to the frictional heat of the lining 11 in the above rotational direction, and the pitch diameter of the hole 16 becomes thicker. At this time, the steel ball 18 is pushed in the X direction by the groove 17, but the steel ball 18 moves along the center line x-x depending on the amount of change in the pinch diameter.
At the same time, the contact part between the metal pin 13 and the hole 16 moves to the left side of the center line x-x', and the amount of change in pitch diameter is Destroyed by movement (absorbed, metal pin 1)
3, the hole 16, the groove 17, and the steel ball 18, a balance is maintained and a stable state is achieved. On the other hand, the metal pin 13 fixed to the flywheel 4 is connected to the S
The same thing can be said when rotating in the T direction (time-opening direction), which is the opposite direction. However, the positional relationship is the opposite of the above.

The above is almost the same for the brake ring side.

Next, FIG. 5 shows another embodiment of the present invention, in which a boss 19 is press-fitted into a hole in a clutch ring 15, and a groove 21 having a hemispherical cross section is provided in the boss 19. ing. Reference numeral 20 denotes a sliding metal bearing, on the outer periphery of which steel balls 18 are attached. I'm h-.

As is clear from the above embodiments, the electromagnetic clutch morph of the present invention has a pin attached to a flywheel that continuously rotates once, and a steel ball is attached to this pin, or a slider is attached to the pin via a steel ball. Then, attach the clutch ring so that it can move freely in the direction of rotation, in the fixed state and in the IQ1 direction, or similarly attach a pin to the bracket, and connect a steel ball to this pin, or a sliding lever and a steel ball to this pin. A brake ring is attached to the output shaft so as to be fixed in the rotating direction and movable in the axial direction, and a clutch rotor located between the clutch ring and the brake ring is attached to the output shaft, and the clutch ring and the brake ring are attached to the output shaft. A clutch electromagnet and a brake electromagnet are installed to bring the L groove into contact with the clutch rotor, which is a disadvantage of the conventional structure in which several clutch rings or brake rings are attached to a pin via a sliding phase and a buffer material. In addition, the steel balls eliminate noise caused by deterioration and deformation of the buffer 2, resulting in a good effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional electromagnetic clutch motor, FIG. 2 is a sectional view of a main part of FIG. 1, FIG. 3 is a sectional view of a main part of an electromagnetic clutch motor according to embodiment 11 of the present invention, and FIG. 3 is a cross-sectional view of FIG. 3 viewed from the direction A-A', and FIG. 5 is a sectional view showing another embodiment of the present invention. 1...Clutch electromagnet, 2...Brake electromagnet, 3...Clutch bracket, 4...
...Flywheel, 13...Pin, 15
...Clutch ring, 18...Steel ball 1
．． 20...Metal bearing. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (2)

[Claims] (1) Attach a pin to at least one side of the bracket and the continuously rotating flywheel, and attach the brake ring/clutch ring to this pin via a steel ball so that it is fixed in the rotational direction but movable in the axial direction. Installed electromagnetic clutch motor. (2) The electromagnetic clutch motor according to claim 1, wherein a sliding force is interposed between the steel ball and the pin.