KR840001804Y1 - Clutch motor - Google Patents

Abstract

No content.

Description

Electronic Clutch Motor

1 is a cross-sectional view of main parts of a conventional electromagnetic clutch motor.

Figure 2 is a cross-sectional view of the main portion of the electronic clutch motor showing an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing the attachment configuration of the clutch ring in FIG.

4 is a sectional view of the main part when the clutch motor is formed of synthetic resin.

5 is a characteristic diagram of an electronic clutch motor.

Figure 6 is a cross-sectional view of the main portion of the electronic clutch motor showing another embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view showing the attachment configuration of the clutch ring in FIG.

The present invention relates to an electromagnetic clutch motor having an electronic power transmission mechanism used for driving an industrial sewing machine, for example, which is fixed to a motor shaft and fixed to a flywheel and fixed to rotation and axially movable to an axial direction. The clutch ring or brake ring is attached to the bracket supporting the output shaft and fixed to the bracket which is fixed against rotation and movable in the axial direction, to the clutch motor fixed to the output shaft by electromagnetic force. Is designed to be selectively pressed, to deliver large torque with a small amperage, and to reduce the occurrence of noise. In addition, the clutch and brake rings are pressed by the clutch spring and the brake spring to suppress the delay in the acceleration and deceleration of the clutch rotor, that is, the output shaft, and further, between the clutch ring, the brake ring and the clutch rotor. The object of the present invention is to prevent collision sound and to prevent the output shaft from revolving unnecessarily while making the force of the brake spring larger than that of the clutch spring. Other purposes and effects will be explained by the following explanation.

Conventionally, in this type of electromagnetic clutch motor, as shown in FIG. 1, the clutch coil 1 and the brake coil 2 are embedded in the clutch fixed iron core 3 and the brake fixed iron core 4, respectively. The clutch fixing iron core 3 and the brake fixing iron core 4 are fixed to the bracket 5. Further, the clutch ring 7 is fixed to the flywheel 6 which is continuously rotated by the motor. The clutch ring 7 is fixed to the output shaft 15 mounted on the same line as the motor shaft 11, and is floating in the rotational direction. A clutch rotary plate 9 having a splined lining 8 so as to be able to move slidably and a brake rotary plate 10 having a lining 8 'are mounted.

Then, when the clutch coil 1 is energized, magnetic flux 101 is generated, and a suction force acts between the clutch ring 7 and the clutch rotating plate 9, so that the clutch rotating plate 9 moves to the left side and the lining ( 8) and the clutch ring 7 are frictionally bonded to each other, and a rotational force is transmitted to the output shaft 15. In addition, although not shown, the output shaft 15 rotates at an arbitrary speed by controlling the energizing current of the clutch coil 1 by a separate speed control device.

In addition, when the brake coil 2 is energized, magnetic flux 102 is generated, and the brake rotary plate 10 is pressed against the brake ring 14 fixed to the bracket 5 via the lining 8 'and the output shaft 15 decelerates rapidly and stops. In addition, (12) is a bowl bearing, and (13) is a clearance adjustment screw.

However, such a conventional structure is such that the clutch rotating plate 9 and the brake rotating plate 10 slide smoothly on a spline installed on the output shaft 15 to transmit rotational force and braking force. Since the rotor is often used as a driving source of the sewing machine for co-op and the pulsating torque is large, there is a drawback that abnormal sounds due to the flow of the spline are easily generated. In addition, there are three gaps in the magnetic circuit, and two of them are radial gaps between the rotating part and the fixed part, although the radial gaps do not act as suction force. A magnetic circuit having low suction power to the amperion inputted to (1) or brake coil (2) and having low efficiency was used.

The present invention solves the above-mentioned drawbacks, and the present invention will be described with reference to FIGS. 2 and 2 showing one embodiment of the present invention.

In FIG. 2 and FIG. 3, 21 is a motor shaft bracket, 22 is a clutch shaft bracket, and they are two screws 23 (only one place is shown in the figure in the figure.) The flywheel 25 is fixed to the motor shaft 24 fixed to the rotor, so that the flywheel 25 rotates integrally with the motor rotor.

Further, the clutch fixing core 27 in which the clutch coil 26 is disposed, and the brake fixing core 30 in which the brake coil 29 is embedded, are fixed to the clutch bracket 22, and the clutch fixing 27 The brake fixing core 30 has portions 28 and 31 each having a small cross-sectional area.

On the flywheel 25, a plurality of cylindrical pins 32 are fixed in the circumferential direction by screws 33, and metal bearings 34, which are sliding members, are axially oriented with respect to the pins 32. There is a gap of about 10 so that it can be moved. In addition, the outer circumferential portion of the metal bearing 34 is formed with a groove 35 to which the 0 ring 36, which is a cushioning material, is attached, and the 0 ring 36 is lightly pressed into the hole of the clutch ring 37, and the clutch The ring 37 is integrated with the metal bearing 34 so as to be movable in the axial direction with respect to the pin 32. On the other hand, on the brake side, a plurality of pins 38 are fixed to the clutch side bracket 22 by screws 39, and through the metal bearings 40 and the 0 ring 41 on the pins 38, The brake ring 42 is attached to be movable in the axial direction.

In addition, linings 45 and 46 are bonded to both sides of the clutch rotor 44 made of light metal such as aluminum or synthetic resin, and the linings 45 and 46 are connected to the clutch ring 37 and the brake. It faces the ring 42. In addition, the clutch rotor 44 is fixed to the output shaft 43 with the screw 47, and these are supported by the motor shaft 24 and the bracket 22 by the ball bearings 48 and 49. As shown in FIG.

This type of electronic clutch motor is often used as a driving source for industrial sewing machines, and it is required that the acceleration and deceleration of the output shaft 43 be extremely fast in order to increase the work efficiency. In addition, in the sewing machine for needles, it is common to have a function of stopping the needle position, but in order to accurately determine the accuracy of the stop position, the slip angle from the stop signal to the stop after being given should be as small as possible. Is required.

In order to satisfy this requirement, the output shaft 43 needs to be as small as possible.

Therefore, as the material of the clutch rotor 44 fixed to the output shaft 43, a light metal such as aluminum or a synthetic resin is suitable, and as a result of repeated experiments, the material of the clutch rotor 44 is FRP (glass fiber). Reinforcement plastic) has been found to be optimal. In particular, unsaturated polyester resins containing glass fibers of glass fiber-reinforced glass resins based on ball-saturated polyester resins have high comparative strength, good dimensional accuracy, high heat resistance temperature and low thermal deformation, and the like. By this, it was concluded that it can be used as such a structural material. The specific gravity is around 1, 7, and thus the inertia is reduced and the inertia of the output shaft is lowered to 30%, compared with the conventional example shown in FIG. 1, and an electromagnetic clutch motor having very good acceleration / deceleration characteristics is achieved.

In addition, as shown in FIG. 4, the structure of the clutch rotor 44 is provided with a plurality of key grooves 50, which serve as slips against the output shaft 43. It is advantageous to install two ribs 51 radially. In other words, the material usage is reduced as much as possible, and at the same time, the price and inertia are reduced, and the rib 51 secures mechanical strength. At the same time, since this shape is aberration, it also serves as a fan and also serves as a purpose of blowing air for cooling each part.

In addition, when the clutch rotor 44 is made of aluminum, since the aluminum is generally unsuitable as the sliding material, the linings 45 and 46 are adhesively fixed to both shafts of the clutch rotor 44, but the lining 45 ( 46 is adhesively fixed to the clutch ring 37 and the brake ring 42, and the surface of the friction joint with the lining of the clutch rotor 44 is subjected to a surface coating treatment such as anodized or chromium plating to improve wear resistance. The lining can be adhesively fixed to the clutch ring 37 and the brake ring 42.

Next, the operation will be described. When the clutch coil 26 is energized, the magnetic flux 103 is generated, and since the clutch fixing core 27 is fixed to the clutch side bracket 22, suction force acts on the clutch ring 37 on the right side, and the clutch ring 37 and the clutch rotor 44 are friction-bonded via the lining 45, and the rotational force of the motor is transmitted to the output shaft 43. As shown in FIG. At that time, it is designed to have a clearance of about 0.5 to 1.0 mm between the clutch ring 37 and the end face of the clutch fixing core 27. Next, when the brake coil 29 is energized, magnetic flux 104 is generated, and the brake ring 42 is attracted to the left side, and the clutch rotor 44 is frictionally bonded to the brake ring 47 via the lining 46. Since the brake ring 42 is attached to the clutch side bracket 22 in a rotationally fixed manner, the output shaft 43 suddenly decelerates and stops. At that time, the end surface of the brake ring 42 and the brake fixing core 30 is designed to have a clearance of about 0.5 to 1.0 mm, similarly to the clutch side.

Since the linings 45 and 46 are made mainly of the compressed cork, the friction ring is repeatedly worn with the clutch ring 37 and the brake ring 42, and as a result, the clutch fixing core 26 The gap between the end face and the clutch ring 37 or the gap between the end face of the brake fixing core 30 and the brake ring 42 becomes small and the suction force increases. Therefore, the suction force change characteristic with respect to the gap change shows an approximately second-order curve, as an example thereof is indicated by curve A in FIG. Compared with the conventional example described in FIG. 1, this structure can constitute a highly efficient magnetic circuit because the two gaps act together on the suction force, while the change of the suction force to the gap change is large, and as a result, the lining ( The suction force rapidly increases due to the wear of the 45 and 46, which in turn promotes the wear of the linings 45 and 46, or shortens the holes of the bowl bearings 48 and 47.

Thus, in the present invention, as shown in FIG. 2, cutouts are formed outside the clutch fixing core 27 and the brake fixing core 30 to form portions 28 and 31 having a small cross-sectional area. As shown by the curve B of FIG. 5, the change of the suction force with respect to a clearance gap is made small.

That is, in the initial state, when the gap is 0.5 to 1.0 mm, the suction force drop due to this notch is minimal, and when the gap is small due to abrasion of the linings 41 and 42, the small cross-sectional area 28 ( This is because the clutch fixed iron core 27 and the brake fixed iron core 30 magnetically saturate by 31, and the increase of the magnetic flux 103 and 104 is suppressed. As a result, when the linings 45 and 46 are worn out, the suction force is excessively increased to promote the wear of the linings 48 and 49, or the life of the bowl bearings 48 and 49 is reduced. I can eliminate it. In addition, the part with small cross-sectional area is not limited to the position shown, What is necessary is just to select the position which can be manufactured easily. The cross sectional area can be easily determined by the B-H characteristics of the iron core material to be used. In addition, since this type of electronic clutch motor is often used as a driving source for industrial sewing machines and has a large pulsating torque, when the clearance between the pin 32 and the metal bearing 34 (the pin 38 and the metal bearing 40) is large, It is easy to produce noise by vibration. In addition, if the gap is made smaller in order to reduce noise, the clutch ring 37 and the brake ring 42 thermally expand due to the frictional heat of the lining portion, and the gap becomes smaller, which makes it difficult to move in the axial direction. You will not be able to deliver it.

As a result of the experiment, if the metal bearings 34 and 40 are directly fixed to the clutch ring 37 and the brake ring 42 without using the 0 rings 36 and 41, the metal bearings 34 and the pins 32 When the gap between the (metal bearing 40 and the pin 38) is 30 m or more, the generation of noise due to flow was remarkable. Therefore, in order to reduce noise, the gap is set to 20 to 25 µm, and the clutch ring 37 and the brake ring 42 are thermally expanded due to the frictional heat of the linings 45 and 46, so that the metal bearing 34 ), The diameter of the attachment pitch of the (40) is increased, so that the above gap is eliminated, and the metal bearing 34 and the pin 32 (the metal bearing 40 and the pin 38 are bitten with each other, the clutch ring 37 and the brake ring). Movement in the axial direction of (42) is no longer possible, and the rotational force transmission and braking functions are not fulfilled, and when the 0 rings 36 and 41 are installed on the outer circumference of the metal bearings 34 and 40, Even when the gap was 100 mu m, the noise was not attenuated by the 0 rings 36 and 41. In addition, the gap was set to 10 mu m while the 0 rings 36 and 41 were installed. The temperature of the lining 45 and 46 is increased by frictional heat, so that the clutch ring 37 and the brake ring 42 are thermally expanded, so that the metal bearings 34 and the pins 32 (metal bearings) are thermally expanded. The 40 and the pin 38 move smoothly in the axial direction without biting each other, so that the function can be sufficiently exhibited, which is a zero ring for the dimensional change portion due to thermal expansion of the clutch ring 37 and the brake ring 42. This is because (36) (41) absorbs.

6 and 7 show another embodiment of the present invention, the flywheel 37 is a clutch ring (37) attached to be movable in the axial direction by way of the clutch spring (52) via the lining (45). ) Is lightly pressed against the lining 45 by the clutch spring 52. On the other hand, the brake ring 42 attached to the pin 38 fixed to the bracket 22 so as to be movable in the axial direction via the metal bearing 40 is lightly pressed against the lining 46 by the brake spring 53. It is.

Thus, since the clutch ring 37 and the brake ring 42 are lightly pressed against the clutch rotor 44 by the clutch spring 52 and the brake spring 53 in advance, the clutch coil 26 or the brake coil ( After 29) starts to energize, the rotational or braking force is transmitted, and the time required for acceleration and deceleration is shortened, and when used as a driving source for industrial sewing machines, the work efficiency is greatly improved. In addition, since the linings 45 and 46 are pressed against the clutch ring 37 and the brake ring 37 in advance, a quiet operation can be performed without generating a hitting sound as in the prior art. In addition, since the clutch ring 37 is lightly pressed against the lining 45 by the clutch spring 52, there is a risk that the output shaft 43 rotates freely when there is no energization of the clutch coil 26, but this is prevented. To this end, the pressing force of the brake spring 53 is stronger than that of the clutch spring 52, and the braking force by the brake spring 53 is larger than the rotation force through the clutch spring 52.

Claims (1)

To the flywheel 25 fixed to the continuously rotating motor shaft 24, the clutch ring 37 is fixedly attached to the rotation shaft in the axial direction and rotated in parallel with the motor shaft 24. The brake ring 42 is attached to the bracket 22 supporting the output shaft 43 attached to the shaft 22 in a fixed manner in the rotational direction, and in the clutch ring 37 and the brake ring 42. The clutch fixing iron cores 27 which face each other to fix the clutch rotor 44 to the output shaft 43 and simultaneously urge the clutch ring 37 and the brake ring 42 to the clutch rotor 44 respectively. And the brake fixing core 30 to the bracket 22, the output shaft 43 is integrally rotated with the motor shaft 24 by the excitation of the clutch fixing core 27, the brake fixing The output shaft 43 is rotated by the excitation of the iron core 30 The electromagnetic clutch motor, characterized in that the stop.