JPS59509Y2 - electromagnetic clutch - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an electromagnetic clutch.

A plurality of concentric elongated holes are punched in the armature disk of the electromagnetic clutch and the wall surface of the rotor facing the disk.

In other words, a joint made of the same magnetic metal as the armature disk and rotor remains integrally with the armature disk and rotor between each elongated hole.

Therefore, the magnetic flux from the electromagnetic coil leaks through this joint, and the loss of the magnetomotive force for attracting the armature disk is extremely large.

Therefore, an object of the present invention is to provide an electromagnetic clutch that eliminates the drawbacks of the prior art described above.

The details of the present invention will be explained based on the embodiments shown in the drawings.

In the figure, a water pump drive shaft 2 is rotatably supported by a water pump casing 1 .

A stator 3 of an electromagnetic clutch and an electromagnetic coil 4 disposed within the stator 3 are fixed to a pump casing 1.

In the artificial part of the stator 3 and in front of the electromagnetic coil 4,
A heater 25 made of nichrome wire or the like is arranged.

The heater 25 can be held inside the stator 3 by pouring a synthetic resin material 26 into the annular groove of the stator 3 so as to surround the electromagnetic coil 4 and solidifying it.

In the illustrated example, a linear heater is used, but of course a planar heater can also be used.

This heater 25 can be operated as shown in FIG. 2, for example.

See Figure 2. When the thermo switch 27 is in the OFF state, the relay 28 does not act and the D-A-B
- form an electric circuit consisting of E;

The current flowing through this circuit consisting of D-A-B-E is the minimum operating current that does not operate the electromagnetic coil 4, and the
The current passing through 5 warms the heater 25 and the adjacent clutch, keeping the clutch surfaces dry at all times.

When the thermo switch is turned on, a D-AC-E electric circuit is formed, and current and voltage are applied to the electromagnetic coil 4, causing the electromagnetic fan clutch to operate.

A rotor 5 is fitted onto the water pump drive shaft 2 .

The rotor 5 has a boss portion 6 fitted into the end portion having a keyway or a cutout portion for preventing rotation of the drive shaft 2, and a stator 3 having a U-shaped cross section and a predetermined gap a, l). The rotor body 7 has a rotor body 7 surrounding the rotor body 7, and a rib 8 that connects the rotor body 7 and the boss 6 over the entire circumference or with an arbitrary gap therebetween.

A belt groove 10 is provided at a suitable location on the rotor body 7 to wrap a belt 9 connected to a power source (not shown).

The gaps a, l) are appropriately selected in consideration of the capacity of the electromagnetic coil 4 and other design matters.

The rotor main body portion 7, the boss portion 6, and the rib 8 may be made separately and later integrated by welding press-fitting or the like, or they may be formed as an integral part from the beginning.

The boss portion 6 is provided with a small-diameter bearing support portion 6a in a stepped manner so as to form a stepped portion that comes into contact with the end portion of the pump drive shaft 2.

The bearing support portion 6a forms a shoulder portion 6b against which the bearing 11 to support rests.

The relative position of the bearing 11 with respect to the boss portion 6 is determined by the shim 12.
Adjusted by

The rotor 7 has a boss portion 6 and a bolt 1 screwed into the drive shaft 2.
3 and the drive shaft 2 together with the bearing 11 by the nut 14.
The tightening is fixed.

The cooling fan 15 is fixed at an appropriate position to a support flange 18 having a housing part 16 on which the bearing 11 is mounted and an annular flange part 17 extending radially from the housing part 16 by a fixing member 19.

A known cooling fan 15 with blades is made of synthetic resin or the like and has an annular cover portion 20 extending in the axial direction so as to cover a portion of the rotor 7 .

The cover portion 20 serves to prevent dust, dirt, etc. from entering the electromagnetic clutch portion and to blow air to prevent the electromagnetic portion from overheating.

On the inner peripheral wall surface of the cover part 20, vanes 29 projecting radially inward are formed at intervals and preferably integrally with the cover part 20.

This cover portion 20 extends to the right as viewed in FIG. 1 so as to cover at least the electromagnetic coil portion.

The blades 29 may be provided coaxially in the longitudinal direction, or may be arranged in a spiral shape.

Of course, it is not necessary to provide the blades on the inner circumferential wall surface of the cover.

The annular flange portion 17 of the support flange 1B is arranged along the right side surface of the root portion 30 of the cooling fan 15 as seen in FIG. It is fixed by a fixing member 19 provided.

The armature disk 24 is arranged to face the annular wall surface 31 of the rotor body 7, and the surface of the armature disk 24 opposite to the surface facing the annular wall surface 31 has a surface that intersects with the radial direction at an appropriate inclination angle. For example, one end of three leaf springs 23 arranged in this manner is fixed using fixing means such as a rivet 25.

Furthermore, for example, adjacent fixing members 19 and fixing members 1
9 and the fixing device 21 such as a rivet 1-1 screw.
As a result, the other end of the leaf spring 23 is fixed with the gap set by the collar 22.

The distance between the annular flange portion 17 and the leaf spring 23 is preset in consideration of the space and smooth movement of the device.

In this way, the armature disk 24 is fixed to the annular flange portion 17 of the support flange 1B via the leaf spring 23, so that the distance from the support flange 1B is normally maintained constant, but when the electromagnetic coil 4 is energized. When a magnetic force is generated by the leaf spring 23, the leaf spring 23
While bending the armature disk 24, the armature disk 24 is sucked,
The armature disk 24 is brought into close contact with the annular wall surface 31 of the rotor main body 7, and the rotational motion of the rotor main body 7 is transmitted to the cooling fan 15 via the armature disk 24, the leaf spring 23, and the annular flange 17. Rotate 15.

The armature disk 24 prevents leakage magnetic flux,
In order to work efficiently, it is configured as follows.

The armature 24 has an annular concentric groove 32, and an outer ring part 33 and an inner ring part 34 formed by the groove 32 are connected by a connecting member 35 made of non-magnetic metal such as brass, aluminum, stainless steel, etc. Multiple wheels at equal intervals 33.34
By driving into the groove 32 between them, the connection is made firmly.

In this case, the two wheels 33, 34 are connected by driving each end of the connecting member 35 into a groove provided in the opposing circumferential wall surface of the two wheels 33, 34.

Alternatively, the two wheels 33 and 34 may be connected by fitting a non-magnetic synthetic resin or metal into the groove 32 over the entire groove.

In this way, as shown in FIG. 3, there is no magnetic flux leakage through the magnetic coupling member shown by the dotted line, which has been experienced in the past, and an efficient magnetic flux flow shown by the solid line is ensured, making it possible to increase clutch efficiency. I can do it.

Similar to the armature disk 24, the rotor body 7
The annular wall surface 31 can be configured as follows.

In this case, a nonmagnetic metal may be press-fitted into the annular grooves A and B provided in the wall surface 31.

Alternatively, a non-magnetic metal may be fixed to the back side of the wall surface 31, and the portions protruding from this non-magnetic metal may be press-fitted into the grooves A and B, respectively.

In either case, the inner and outer parts and intermediate members of the rotor 5 can be firmly held and leakage of magnetic flux can be prevented.

The combination of the rotor using this non-magnetic metal and the armature disk 24 described above allows the electromagnetic clutch to be used with maximum efficiency, and can further improve the clutch effect.

The cooling fan 15 can be supported by the boss portion 6 of the rotor 5 via the bearing 11, and the relative position between the rotor 5 and the cooling fan 15 can be adjusted by the shim 12.

That is, the gap between the armature disk 24 and the rotor body 7 can be adjusted by the shim 12.

By attaching the cooling fan 15 to the rotor 5 via the bearing 11, the cooling fan 15 and the rotor 5 are configured as one unit, and can be easily assembled to the pump drive shaft 2 as one completed assembly. Assembly is possible.

As is clear from the above, connecting members made of non-magnetic material are disposed in the annular grooves provided in the annular wall surfaces of the armature disk and the rotor body, and the base pieces defined by the annular grooves are connected. There is no magnetic flux leakage from the joints of the same magnetic metals, and there is no decrease in the magnetomotive force that creates the attractive force of the armature disk.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of an electromagnetic fan clutch;
FIG. 2 is a diagram showing an example of an electric circuit for a heater, FIG. 3 is a partial sectional view showing an example of an armature disk, and FIG. 4 is a partial perspective view showing an example of a connecting member. In the diagram: 2... Drive shaft, 3... Stator, 4... Electromagnetic coil, 5... Rotor, 6... Boss, 7...
Rotor main body, 10... Belt groove, 11... Bearing, 12... Shim, 15... Cooling fan, 23...
... Leaf spring, 24... Armature disc, 25.
... Heater, 33.34 ... Inner and outer rings, 35 ... Connection member.

Claims (1)

[Scope of utility model registration request] In an electromagnetic clutch having at least a rotatable rotor, an armature disk facing the rotor, and a stator containing an electromagnetic coil disposed in close proximity to the rotor, the armature disk is separately molded. Consisting of an inner ring and an outer ring, a connecting member made of a non-electromagnetic material is press-fitted into a plurality of spaced apart notches provided in a circumferential wall surface of an opposing surface between the inner and outer rings to connect the inner and outer rings in a concentric relationship, or , a non-electromagnetic material is inserted into the entire annular groove between the inner and outer rings to concentrically connect the inner and outer rings, an annular groove is provided on the wall surface of the rotor facing the armature disk, and the groove is partitioned by iron. An electromagnetic clutch characterized in that each wall piece is connected by a connecting member made of a non-magnetic material.