JPH0511380Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure for fixing an excitation device to an output rotating body in an electromagnetic clutch.

[Conventional technology]

Many engines and auxiliary machines for vehicles are equipped with electromagnetic clutches to stop power transmission from the engine when they are not in use. In auxiliary machinery equipped with such an electromagnetic clutch, a boss part that supports the input rotating body is provided on the auxiliary equipment housing as a means for fixing the excitation device necessary for the electromagnetic clutch, and the excitation device of the electromagnetic clutch is attached to the boss part. is fixed via a stator yoke (Tokuko Showa).
57-40377).

Such a conventional fixing structure for an excitation device will be described with reference to FIG.

The electromagnetic clutch has an output rotating body 1 and an input rotating body 4.
A hub 3 is coupled to the shaft 2 of the output rotating body 1, and the hub 3 is coupled via a rubber elastic body 6 to a movable piece 7 made of a magnetic material. The input rotary body 4 is connected to a drive source with a V-belt and is constantly given rotational force, and is also supported via a bearing 15 by a protruding boss portion 16 provided on the output rotary body 1, and its side surface is surrounded by a small magnetic space. 5 and faces the moving piece 7. The input rotating body 4 and the movable piece 7 are frictionally engaged with each other by the excitation action of the excitation device.

The excitation device 8 includes an excitation coil 10 and a yoke main member 1.
1, the excitation coil 10 is pre-wound in a rectangular shape, and has a cross section formed by an outer protrusion 11a and an inner protrusion 11b of the yoke main member 11 fixed to the stator yoke 9. After being loosely fitted into the shape space, it is fixed to the main yoke member 11 with a resin insulator 12.

In order to fix the excitation device 8 to the output rotating body 1, a center hole is provided in the center of the stator yoke 9 that supports the excitation device 8, and this center hole is fitted into the protruding boss portion 16. The stator yoke 9 is fixed to the protruding boss portion 16 by inserting a tapered circlip 18 along the side surface of the stator yoke 9 into a circlip groove 17 provided on the outer periphery of the base portion of the boss portion 16. ing.

[Problem that the invention attempts to solve]

In the excitation device fixing structure constructed as described above, the stator yoke 9 that carries the heavy excitation device 8 is attached to a circular clip at the base of the protruding boss portion 16 where stress tends to concentrate when the belt tension is large. 17, its retention is not necessarily sufficient. In particular, the development of electromagnetic clutches has progressed recently and they have become significantly smaller.As a result, the diameter of the protruding boss provided on the auxiliary equipment (output rotating body) housing has also become smaller, and the circlip itself has also become smaller. There is a problem in that the fixing force of this circlip cannot withstand the fluctuating acceleration of the excitation device that occurs when the machine rotates at high speed, resulting in wear of the circlip groove or breakage of the protruding boss.

In view of the above points, the present invention provides a fixing structure that can stably fix an excitation device in an electromagnetic clutch.

[Means for solving problems]

According to the present invention, the above-mentioned problems can be solved by having an input rotating body that rotates by power from a drive source, and a protruding boss portion that supports the input rotating body via a bearing, and which approaches and separates from the input rotating body. The output rotating body is provided with an output rotating body disposed to freely engage with each other, and an excitation device fixed to the output rotating body via a stator yoke, and the output rotation is caused by the excitation action of the excitation device when energized. In an electromagnetic clutch configured to rotate the output rotary body by engaging the output rotary body with the input rotary body, the output rotary body is provided with a protruding body that is divided in the circumferential direction and has a larger diameter than the protruding boss portion, The stator yoke is provided with a circumferentially divided fitting hole into which the protruding body is fitted, and a circlip groove is formed on the inner periphery of the protruding body by fitting the protruding body into the fitting hole. This problem is solved by inserting a circlip to fix the stator yoke to the output rotating body.

[Effect]

In the present invention, the stator yoke carrying the excitation device is fixed by a protruding body with a larger diameter that is provided separately from the protruding boss part that supports the input rotating body.
This prevents stress from concentrating on the protruding boss during high loads, and the effective diameter of the circlip that fixes the stator yoke is large, resulting in high rigidity and a wedge effect that increases the restraining force in the thrust direction. To stably hold an excitation device fixed even during high-speed rotation.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is an auxiliary machine in the engine;
In other words, it is an output rotating body, and this output rotating body 1
A hub 3 is coupled to the shaft 2, and the hub 3 is coupled via a rubber elastic body 6 to a movable piece 7 made of a magnetic material.

Reference numeral 4 denotes an input rotary body which is connected to a drive source by a V-belt (not shown) and rotates at all times, and one side of the input rotary body is disposed with a slight magnetic space 5 between it and the movable piece 7. A bearing 15 is attached to the center of this input rotating body 4, and this bearing 1
5, it is rotatably supported by a protruding boss portion 16 formed protrudingly on the output rotating body 1.

Reference numeral 8 denotes an excitation device, which is composed of an excitation coil 10 and a main yoke member 11. Excitation coil 1
0 is pre-wound into a rectangular shape, and after being loosely fitted into the space having a U-shaped cross section formed by the outer protruding part 11a and the inner protruding part 11b of the main yoke member 11, it is jointed with a resin insulator 12. It is fixed to the main iron member 11. Reference numeral 9 denotes a stator yoke, which has a disk shape as a whole as shown in FIG. 2, and its outer peripheral portion is fixed to the back surface of the main yoke member 11 by projection welding.

The structure for fixing the stator yoke 9 carrying the excitation device 8 in this manner to the output rotating body 1 will be described next.

As shown in FIG. 3, the output rotating body 1 is provided on the same side as the protruding boss portion 16 with an arcuate protruding body 20 having a larger diameter and divided into three to four pieces in the circumferential direction. This protruding body 20 is provided with a circlip groove 21 on its inner periphery. On the other hand, as shown in FIG. 4, the stator yoke 9 is provided with an arc-shaped fitting hole 22 which is also divided into three to four pieces in the circumferential direction at a position corresponding to the protrusion 20. A center hole 23 into which the protruding boss portion 16 fits is provided at the center. These protrusions 20 and fitting holes 22 are
After fitting as shown in the figure, as shown in FIG. The stator yoke 9 is firmly fixed to the output rotating body 1. At the same time, the protruding boss portion 16 is inserted into the center hole 23 of the stator yoke 9.

The dimensional relationship between the protruding body 20 of the output rotating body 1 and the fitting hole 22 of the stator yoke 9 is as shown in FIG. 7, with the outer diameter of the fitting hole 22 being I ₁ and the inner diameter being I _{3 .} , the inner diameter of the inner protrusion 11b of the main yoke member is I ₂ , the protrusion 20
When the outer diameter is m ₁ and the inner diameter is m ₂ , I ₂ ≒ m ₁ , I ₃
≒m ₂ , I ₁ >I ₂ (m ₁ ) so that the yoke main member 11 is supported when the protrusion 20 is inserted. The excitation device 8, the stator yoke 9, the protruding body 20, and the circlip 2 fixed to the output rotating body 1 in this way
The positional relationship with 4 is shown in FIG.

As shown in FIG. 1, the input rotating body 4 is assembled by fitting the bearing 15 attached thereto to the outer periphery of the protruding boss portion 16 of the output rotating body 1 and supporting it there. A tapered circlip 26 is installed in the circlip groove 25 provided on the outer periphery near the tip of the boss portion 16.
Do this by inserting

Note that FIG. 9 shows the output rotating body 1, the excitation device 8,
The input rotating body 4 is shown in a disassembled state before being assembled.

In this embodiment assembled as described above, the protruding boss portion 1 provided on the output rotating body 1 is
The protruding body 20 having a diameter larger than 6 supports the inner periphery of the excitation device 8 and at the same time fixes the stator yoke 9 together with the taper circlip 24 on the inner periphery of the protruding body 20. The excitation device 8, which includes heavy parts, is supported at a position close to its center of gravity, so that the protrusion 20 can directly absorb a large load due to vertical vibrations applied to the excitation device 8 from the outside. Therefore, the excitation device 8 is firmly and stably fixed to the output rotating body 1 in the vertical and longitudinal directions. Further, since the circlip 24 can also have a large diameter, its rigidity is strong, and the resistance to movement in the thrust direction due to the wedge effect is increased.

The load of this excitation device 8 is the input rotating body 4
Since stress is not applied directly to the protruding boss portion 16 that supports the excitation device 8, concentration of stress at the base of the protruding boss portion 16 can be avoided, and the excitation device 8 can be stably fixed.

[Effect of idea]

As described above, the present invention has a structure in which the excitation device is fixed with a protruding body that is separate from the protruding boss portion that supports the input rotating body and has a larger diameter. The protruding body directly absorbs the load caused by the vertical vibration of the excitation device that occurs during rotation, thereby avoiding stress concentration at the base of the protruding boss, making the fixation stable and strong. becomes. In addition, since the protruding body has a large diameter, the circlip used here also has a large diameter, which increases the rigidity of the circlip and increases the resistance force in the thrust direction due to the wedge effect, making it reliable as a fixing structure for the exciter. This will improve the quality of the product. Further, since the protruding body and the protruding boss portion are integrally constructed, simultaneous cutting is possible, and therefore, coaxiality of the input rotary body and the excitation device can be easily achieved.

Also, during assembly, only the insertion of a circlip is required, which simplifies the work process.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is an exploded perspective view of the main part of the excitation device shown above, Fig. 3 is a perspective view of the main part of the output rotor shown above, and Fig. 4 is a stator joint of the same above. A perspective view of the iron, Fig. 5 is a vertical cross-sectional view of the same stator yoke and the output rotating body just before they are assembled, Fig. 6 is an enlarged perspective view of the main parts after the above assembling, and Fig. 7 is the same as the above assembly. FIG. 8 is a side cross-sectional view showing the assembled state of the excitation device and the output rotating body in the above embodiment, and FIG. 9 is an explanatory diagram showing the dimensional relationship between the stator yoke and the protruding body at the time. Fig. 10 is an exploded perspective view of the main parts of
FIG. 3 is a longitudinal cross-sectional view of a conventional excitation device fixing structure. 1... Output rotating body, 4... Input rotating body, 8...
Excitation device, 9...Stator yoke, 10...Excitation coil, 11...Yoke main member, 15...Bearing, 16...
... Projection boss portion, 20 ... Projection body, 21 ... Circlip groove, 22 ... Fitting hole, 24 ... Tapered circlip.

Claims (1)

[Scope of utility model registration request] An input rotating body that rotates by power from a drive source, and an output rotating body that has a protruding boss portion that supports the input rotating body via a bearing and is arranged to engage with the input rotating body so as to be able to come into contact with and separate from the input rotating body. and an excitation device fixed to the output rotating body via a stator yoke, the output rotating body and the input rotating body are engaged by the excitation action when the excitation device is energized, and the output is generated. In the electromagnetic clutch configured to rotate a rotary body, the output rotary body is provided with a protruding body that is divided in the circumferential direction and has a larger diameter than the protruding boss portion, and the protruding body is fitted into the stator yoke. A fitting hole is provided which is divided in the circumferential direction, and the protruding body is fitted into the fitting hole, and the stator joint is inserted into a circlip groove formed on the inner periphery of the protruding body. An exciting device fixing structure for an electromagnetic clutch, characterized in that iron is fixed to the output rotating body.