JPS6243419B2 - - Google Patents

Description

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

As shown in Fig. 1, a conventional electromagnetic clutch motor has a clutch electromagnet 1, a brake electromagnet 2, and a brake friction disk 3 fixed to a bracket 4, and the clutch is connected to a flywheel 5 driven at a constant speed by a motor. A friction disk 6 is fixed. Also provided on the output shaft 7 are a clutch ring 9 and a brake ring 10 having a splined lining 8 which is fixed in the rotational direction but slidable in the axial direction. When the clutch electromagnet 1 is energized now, the electromagnetic force causes the clutch ring 9 to
is pressed against the clutch friction disk 6, and rotational force is transmitted to the output shaft 7. The output shaft 7 rotates at a desired speed by controlling the current flowing through the clutch electromagnet 1 using a speed control device (not shown) provided separately, and when the brake electromagnet 2 is energized, the brake ring 10 is rotated against the brake friction disk 3. The output shaft 7 is brought into pressure contact and rapidly decelerates and stops. 11 is a motor shaft, 12 is a ball bearing, and 13 is a gap adjustment screw.

As described above, in the conventional motor, the clutch ring 9 and the brake ring 10 slide on the splines provided on the output shaft 7 to transmit rotational force and braking force, and this type of electromagnetic clutch motor is particularly suitable for industrial use. Since it is often used as a drive source for commercial sewing machines and has a large pulsating torque, it has the disadvantage of being prone to abnormal noises due to play in the splines.

The present invention solves the above-mentioned conventional drawbacks and will be described below with reference to FIGS. 2 and 3 showing embodiments thereof.

1 is a clutch electromagnet, 2 is a brake electromagnet, 3
are brake friction discs which are each fixed to a bracket 4, and a clutch friction disc 6 is fixed to a flywheel 5 which is driven at a constant speed by a motor. Further, a clutch rotor 14 is fixed to the output shaft 7 provided on the same straight line as the motor shaft 11, and a plurality of pins 15 are fixed to both end surfaces of the clutch rotor 14. 16
is a metal bearing, which is a sliding material, and an O-ring 17, which is a buffer material, is attached to a groove on its outer periphery, and this O-ring 17 is lightly press-fitted into the holes of the clutch ring 9 and brake ring 10, and these are attached to the pin 15. It is mounted so that it can move in the axial direction. A lining 8 is attached to each of the clutch ring 9 and the brake ring 10. Note that 12 is a ball bearing, and 13 is a gap adjustment screw. When the clutch electromagnet 1 is energized, the electromagnetic force causes the clutch ring 9 to come into pressure contact with the clutch friction disk 6, and rotational force is transmitted to the output shaft 7. Also, brake electromagnet 2
When energized, the brake ring 10 is pressed against the brake friction disk 3, and the output shaft 7 is rapidly decelerated and stopped. Note that this type of motor is often used as a drive source for industrial sewing machines and has a large pulsating torque, so if the gap between the pin 15 and the metal bearing 16 is large, play noise is likely to occur. Furthermore, if the gap is made smaller in order to reduce play noise, the clutch ring 9 and brake ring 10 will thermally expand due to the frictional heat of the lining 8, making the gap smaller and smaller, making it difficult to move in the axial direction and transmitting power. ceases to function.

Experimental results show that when the metal bearing 16 is directly fixed to the clutch ring 9 and brake ring 10 without using the O-ring 17, play noise becomes significant when the gap between the metal bearing 16 and the pin 15 is 30 μm or more. Therefore, in order to reduce the play noise, we set the above-mentioned gap to 20 to 25 μm, and the lining 8
The clutch ring 9 and brake ring 10 thermally expand due to the frictional heat in the parts, and the diameter of the mounting pitch of the metal bearing 16 increases, eliminating the aforementioned gap and causing the metal bearing 16 and pin 15 to jam together, causing the shafts of the clutch ring 9 and brake ring 10 to become stiffer. It became impossible to move in any direction, and the rotary force transmission and braking functions were no longer performed.

On the other hand, when the O-ring 17 was provided on the outer periphery of the metal bearing 16, play noise was attenuated by the O-ring 17 and did not occur even if the gap was set to 100 μm.
Also, with the O-ring 17 installed, the gap is increased to 10
Even if the temperature of the lining 8 is raised by frictional heat and the clutch ring 9 and brake ring 10 are thermally expanded, the metal bearing 16 and pin 15
It moved smoothly in the axial direction without any galling, and was able to fully perform mechanical farming. This is because the O-ring 17 absorbs dimensional changes due to thermal expansion of the clutch ring 9 and brake ring 10.

As is clear from the above embodiments, the electromagnetic clutch motor of the present invention has a metal bearing movably attached in the axial direction to a pin provided on the axial end face of the clutch rotor, and a groove provided on the outer circumference of the metal bearing. O
This O-ring is press-fitted into a hole in the inner circumference of the clutch ring, and an electromagnet is installed to bring the clutch ring into contact with the clutch friction disc. The O-ring eliminates the occurrence of noise due to clearance play and galling of the sliding part, and enables good power transmission.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional electromagnetic clutch motor.
FIG. 2 is a sectional view of an electromagnetic clutch motor according to an embodiment of the present invention, and FIG. 3 is a sectional view of essential parts of the same electromagnetic clutch motor. 1... Clutch electromagnet (electromagnet), 2... Brake electromagnet (electromagnet), 3... Brake friction disc, 4... Bracket, 5... Flywheel,
6...Clutch friction disc, 7...Output shaft, 8...
Lining, 9...Clutch ring, 10...Brake ring, 11...Motor shaft, 14...Clutch rotor, 15...Pin, 16...Metal bearing (sliding material), 17...O ring (buffer material) ).

Claims (1)

[Claims] 1 A clutch friction disk is attached to a flywheel driven by a motor, a clutch rotor is attached to an output shaft provided on the same straight line as the motor shaft, and a metal bearing is attached to a pin provided on the axial end surface of this clutch rotor. is attached so as to be movable in the axial direction, an O-ring is attached to the groove provided on the outer periphery of the metal bearing, this O-ring is press-fitted into the hole provided on the inner periphery of the clutch ring, and this clutch ring is attached to the clutch ring to prevent clutch friction. An electromagnetic clutch motor characterized by having an electromagnet brought into contact with a disc.