JPH04119641U - Electromagnetic friction clutch or brake - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] In electromagnetic friction clutches or friction brakes, the wear particles remaining between the friction surfaces are uniformly distributed over the entire surface. [Structure] The electromagnetic friction clutch or brake is configured to apply a slight vibration in the axial direction to the friction surface of the armature. For this reason, in the excitation operation type, a composite circuit 12 consisting of an excitation current 10 and a high frequency power source 11 is constructed, and a high frequency current is added to the DC current as the excitation current, and in the non-excitation operation type, A slight vibration in the axial direction is applied to the high frequency armature 7. A pressing plate made of piezoelectric ceramic material connected to a power supply circuit is attached via an actuating spring, and when the pressing plate is vibrated in the axial direction by power from a high-frequency power source, the piezoelectric effect converts it into a weak vibration in the axial direction. , which applies a weak vibrational force in the axial direction to the armature via the actuating spring.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an improvement in an electromagnetic friction clutch or brake.

0002

[Conventional technology]

A conventional electromagnetic friction clutch was constructed as shown in FIG. In the figure, 1 is a yoke with a built-in coil 2, which is supported on a drive shaft 3 with a bearing 4. These 1 and 2 constitute a stationary part C. Note that 5 is a rotation stopper. The drive section is composed of a rotor 6 and an armature 7, and the armature 7 is a sprocket. It engages with the spline 8a of the line hub 8 and can slide in the axial direction. Ru. The rotor 6 is attached to the drive shaft 3, and the spline hub 8 is attached to the driven shaft (not shown). can be attached to. In addition, 2a is the lead wire of the coil 2, 9 is the return spring, and 10 is the excitation wire. It is a magnetic power source.

0003 In the above configuration, the coil 2 is connected to the excitation power source 10 via the lead wire 2a. When electricity is applied, a magnetic flux is generated in the yoke 1 due to the excitation of the coil 2, and this magnetic flux passes through the air gap. The rotor 6 is magnetized through the magnetic force, and the armature 7 is moved by the return spring 9. It is attracted to the rotor 6 against the pressure. Therefore, the armature 7 is closely spaced from the rotor 6. The friction causes the driving part and driven part to connect and rotate. On the other hand, when the coil 2 is de-energized, the magnetic force of the yoke 1 disappears, so the return spring 9 A restoring force acts, and the armature 7 is pulled back to the position shown in the figure, and the armature 7 is released from the connection with the rotor 6. To be released.

0004

[Problem that the idea aims to solve]

By the way, all electromagnetic friction clutches or friction brakes like the one proposed in this invention In devices that transmit torque through sliding friction parts, if the friction force is unstable, the transmission will be affected. Since the torque or braking torque will become unstable, it is important that the above frictional force is stable. is required. However, in the conventional system, the excitation power source 10 shown in FIG. 4 is supplied to the coil 2. As shown in Figure 5, the exciting current is a DC current that remains constant over time, so there is no vibration. On the other hand, the armature is in contact with the magnetic pole surface 1a of the yoke 1, which is a friction surface. Wear powder generated by friction force is not removed from friction surfaces such as A7, and is unevenly distributed on the friction surfaces. Since this wear powder remains, the frictional force fluctuates due to the presence of this wear powder. For this reason, the transmission torque or braking torque of the friction clutch or friction brake is unstable. There was a problem that it became fixed. The present invention is an electromagnetic friction system that solves the above-mentioned issues (problems) of conventional products. The purpose is to provide a clutch or friction brake.

[0005]

[Means to solve the problem]

The present invention is based on the friction surface of the armature of the electromagnetic friction clutch or friction brake. An electromagnetic friction clutch or friction clutch that applies a slight vibration force in the axial direction to the Regarding friction brakes. In this case, the excitation current for the electromagnetic friction clutch or brake is Using an exciting current with a superimposed wave current, the friction surface of the armature is slightly weakened during operation. It may also be made to vibrate. In addition, the armature of a non-excited electromagnetic friction clutch or friction brake A pressing plate made of piezoelectric ceramic material is connected to a high-frequency power circuit. It is attached via an actuating spring, and the power from the high frequency power source is applied to the piezoelectric effect by the pressing plate. The result is converted into a weak vibration in the axial direction, which is transmitted to the armature in the axial direction via the above-mentioned operating spring. It can also be configured to apply a weak vibration force.

[0006]

[Effect]

The device of this invention applies slight vibration in the axial direction to the friction surface of the armature etc. during operation. so that the wear particles remaining on the friction surface are not unevenly distributed and are distributed evenly over the entire friction surface. Since the frictional force is uniformly distributed, fluctuations in the frictional force caused by wear particles are significantly reduced.

[0007]

【Example】 The present invention will be specifically explained below with reference to embodiments shown in FIGS. 1 to 3. First, a first embodiment of the present invention shown in FIGS. 1 and 2 will be described. In the first embodiment, as shown in Fig. 1, an electromagnetic friction clutch or friction brake is used. The main body of the rake can be exactly the same as the conventional one, so the corresponding parts are the same as in Figure 4. It is shown with the symbol. 11 is a high frequency power supply, 12 is a synthesis circuit, and in the first embodiment, from the excitation power supply 10. The high-frequency power from the high-frequency power supply 11 is superimposed on the DC excitation power of the combining circuit 12. Then, as shown in Fig. 2, a pulsating excitation current is supplied to the coil 2 via the lead wire 2a. A distinctive feature of the structure lies in the fact that it is designed to do so.

[0008] In the above configuration, the coil 2 is connected by the power sources 10 and 11 when the clutch is operated. When a pulsating excitation current as shown in FIG. 2 is supplied through the component circuit 12, the yoke 1 The armature 7 is attracted to the rotor 6 by the magnetic force. In this case, The friction surface of Mature 7 has a pulsating excitation current as described above, so it is weak in the axial direction. Because of the vibration, wear particles are uniformly distributed over almost the entire friction surface, which increases the torque. There will be no problem with communication.

[0009] Next, a second embodiment of the present invention will be explained with reference to FIG. This example is a non-excitation type This is a case where the present invention is applied to an electromagnetic clutch. In the same figure, 13 is a yoke with a built-in coil 14, and 15 is a piezoelectric ceramic material. 16 is an actuation spring, and 16a is a pusher made of piezoelectric ceramic material. A basting plate is attached to the recess of the yoke 13 and the opposing surface of the armature. Note that 16b is a high-frequency power supply circuit for supplying high-frequency power to the pressing plate 16a. It is a road. 17 is a housing, 18 is an inner disk, 19 is an outer disk, 20 is an end plate, 21 is an adjustment ring, 22 is a passive hub, 23 is a drive hub, 24 is a slip ring.

0010 When the coil 14 is energized, a strong electromagnetic force is generated between the yoke 13 and the armature 15. Occur. This electromagnetic force overcomes the force of the actuation spring 16 and attracts the armature 15. However, the end plate 20 or outer disc 19, which has been crimped until now, A slight gap is created between the inner disk 18 and the clutch is released. coil When the power source 14 is turned off, the electromagnetic force disappears, and the force of the actuating spring 16 causes the end plate to The outer disk 19 and inner disk 18 are pressed together and cracked. are connected. By the way, the armature 15 in this embodiment is connected to the high frequency power supply circuit 16b. The pressing plate 16a made of a piezoelectric ceramic material is pressed through the actuating spring 16. Since the high frequency power supply circuit 16a is attached to the The attachment plate 16a is vibrated in the axial direction, and this vibration is transmitted to the armature via the actuating spring 16. The armature 15 is transmitted to the armature 15 so as to impart a slight vibration in the axial direction to the armature 15. Therefore, the wear powder remaining on the friction surface of the armature 15 is unevenly distributed as in the first embodiment. It becomes evenly distributed without being present.

[0011] Each of the above embodiments is an electromagnetic excitation operated type and non-excitation operated type friction clamp. Although the present invention has been explained in the case where the present invention is applied to each of these types of friction brakes, Of course, it is also applicable to .

0012

[Effect of the idea]

Since the present invention is constructed as described above, it has excellent effects as described below. When operating an electromagnetic friction clutch or brake, the friction between the surfaces is relatively weak. Because of the vibration, wear particles are distributed almost uniformly over the entire friction surface. Therefore, there is no longer any possibility of unstable fluctuations in torque transmission.

[Brief explanation of drawings]

FIG. 1 is a half longitudinal sectional front view including a connection diagram showing a first embodiment of the present invention.

FIG. 2 is a time characteristic diagram of excitation current in the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional front view showing a second embodiment of the present invention.

FIG. 4 is a half-part vertical front view including a connection diagram of a conventional example.

FIG. 5 is a time characteristic diagram of excitation current in a conventional example.

[Explanation of symbols]

1,13: York 2, 14: Coil 6: Rotor 7,15: Armature 10: Excitation power supply 11: High frequency power supply 12: Synthesis circuit 16: Operating spring 16a: Pressing plate made of piezoelectric ceramic material 16b: High frequency power supply circuit

──────────────────────────────────────────────── ─── Continued from the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location F16D 65/21 E 8009-3J H01L 41/09 7342-4M H01L 41/08 C

Claims (3)

[Scope of utility model registration request] 1. An electromagnetic friction clutch or friction, characterized in that a weak vibrational force in the axial direction is applied to the friction surface of the armature of the electromagnetic friction clutch or friction brake. Brake. [Claim 2] The electromagnetic friction clutch or friction brake is characterized by using an excitation current superimposed with a high-frequency current as an excitation current, and when the excitation current is activated, the friction surface of the armature is slightly vibrated. An electromagnetic friction clutch or brake. [Claim 3] A pressing plate made of a piezoelectric ceramic material connected to a high-frequency power circuit is attached to the armature of a non-excitation operated electromagnetic friction clutch or friction brake via an operating spring. , the electric power from the high frequency power supply is converted into a weak vibration in the axial direction by the piezoelectric effect by the pressing plate, and a weak vibration force in the axial direction is applied to the armature via the actuating spring. Non-excitation operated electromagnetic friction clutch or brake.