JPS6088232A - Solenoid spring clutch - Google Patents

Abstract

PURPOSE:To reduce impact torque at the time of winding coiled spring by disposing a subsidiary armature connecting with a coiled spring between the friction surface of an input rotor and a main armature for engaging the coiled spring. CONSTITUTION:When an exciting coil 2 is excited, main and subsidiary armatures 5, 16 are magnetized, so that the subsidiary armature 16 is sucked to the friction surface 1a of an input rotor 1 against an elastic body 14, and at the same time the main armature 5 is adsorbed to the subsidiary armature 16. Therefore, the torque of the input rotor 1 is transmitted to the subsidiary armature 16. At this time, a part of the torque is transmitted to an output hub 4 and a driven shaft 3 through a ring 15, an elastic body 14 and a cover 7, so that the main armature 5 is rotated relatively to the input rotor 1 and the subsidiary armature 16 to fasten a coiled spring 6 round a cylindrical portion 1b of the input rotor 1 and an outer peripheral surface 4a of an output hub 4, so that torque of the input rotor 1 is transmitted to the hub 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an FF for intermittently drivingly connecting a compressor for an automatic military air conditioner to the output shaft of an engine as a driving source, for example.
i Pertaining to magnetic spring clutches.

[Prior art]

Conventional electromagnetic spring clutches of this type have a driven shaft (
For example, it is rotatable with respect to the rotating shaft of a compressor) and has one end face that does not form a friction surface and a cylindrical part that protrudes in the axial direction from the tooth surface, and the cylindrical part 11 output hubs are arranged adjacent to and in the axial direction and are attached to the driven shaft and rotate in relation to the shaft; Tasuki&tco・
an armature which is arranged to be able to move forward and backward with respect to the 1" I vibrator and which attracts the friction 1 to the surface when the coil coil is energized; and i"+il input rotor. a coil spring extending around a cylindrical part and the output hub, one end of which is engaged with the armature, and the other end of which is engaged with the output hub; When the input rotor is attracted to the friction surface of the rotor, the torque of the input rotor is applied to the one end of the coil spring through the armature, thereby causing the two coil springs to move onto the cylindrical portion of the input rotor and the outer peripheral surface of the output hub. The torque of the input rotor is transmitted to the output hub via the coil spring, and then to the driven shaft.

In the conventional electromagnetic spring clutch having the above structure, there is a problem in that an impact torque is generated on the driven shaft at the moment the coil spring wraps around the cylindrical portion of the human-powered rotor, resulting in impact noise. Furthermore, the durability of the connection between the output hub and the driven shaft and the driven shaft is significantly reduced, and in some cases, this may cause damage to the fastening portion or the driven shaft.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and by arranging a sub-armature connected to a coil spring between the friction 1β surface of the human-powered rotor and the main armature that locks the coil spring, The purpose is to significantly reduce the ffi impact torque when winding a coil spring.

〔Example〕

The present invention will now be described in detail with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 3 indicates a rotating shaft of a compressor for an automobile air conditioner, and this rotating shaft 3 rotatably passes through the cylindrical portion 8a of the current front housing 8. Reference numeral 19 denotes an electromagnetic spring clutch that transmits the rotation of the output shaft of an automobile engine (not shown) to the compressor rotating shaft 3.

This electromagnetic spring clutch 19 has an input rotating body J or a human-powered rotor 1 rotatably attached to the cylindrical portion 8a of the Freon 1 housing 8 via a hair ring 9. One end surface 1a of the input rotor l constitutes a friction surface, and a cylindrical portion 1b projects from this one end surface 1a in the axial direction.

Further, a plurality of V-shaped groove ICs are provided on the outer circumferential surface of the human-powered rotor 1 to receive polyurethane belts.

The rotating shaft 3 of the compressor serves as one driven shaft driven by the Effengin force shaft described in NiI, and this rotating shaft 3 has an output hub 4 that constitutes the output rotating body of the clutch.
is installed.

An annular recess 1d is formed in the end surface of the input rotor 1 on the anti-friction surface side, and an excitation coil 2 is disposed within this recess 1d with a slight gap therebetween.
, the stay 2b, the inner race 9a of the bearing 9, and the circlip 170). Reference numeral 16 denotes a sub-armature formed in an annular shape as a whole, and is arranged between the friction surface 1a of the input rotor 1 and the main armature 5. This sub-armature 16 is coupled to the splinter cover 7 via an elastic body 14 such as rubber and a metal ring 15 so as to be movable in the axial direction with respect to the friction surface 1a of the input rotor 1. C main armature 5 is located between spring cover 7 and sub armature 16,
The main armature 5 is held between the sub armature 16 and the spring cover 7 by an axial reaction force caused by the initial displacement of the elastic body 14. Cylindrical part tb of input rotor l
and the outer peripheral surface 4a of the hub 4 are coaxial, and both 1b
, 4a are arranged adjacent to each other in the axial direction. The coil spring 6 is connected to the cylindrical portion 1b and the outer peripheral surface 4a of the hub 4.
The hook 6a at one end thereof is engaged with a notch 12 of the main armature 5, and the hook 6b at the other end thereof is engaged with a notch 13 provided in the outer peripheral surface 4a of the hub 4.

Next, the output hub 4 will be explained. As described above, the hub 4 is provided with a notch 13 for locking the hook 6b at the other end of the coil spring 6, and the outer circumferential surface 4a of the hub 4 is provided with a notch 13 for locking the hook 6b at the other end of the coil spring 6. It constitutes the friction surface to be wrapped. Furthermore, the hub 4 is fixed to the driven shaft 3 by a nut 11 via a key 10.

Note that the outer circumferential surface of the coil spring 6 and the hub outer circumferential surface 4
A cover 7 formed to cover a is located at one ζ with respect to the hub 4.
It is installed by Porto 18.

This cover 7 has a flange 7a having a U-shaped cross section, and a metal ring 15 and an elastic body 14 such as bonded rubber are adhered to the outer periphery of the flange 7a.
is press-fitted into the sub-armature 1 (i).

Furthermore, in this example, the input rotor ■, the yoke 2a1
The main armature 5, sub-armature 16, and hub 4 are all made of iron-based material, and the cover 7 is made of iron-based material or electromagnetic material such as aluminum.

Both armatures 5.16 are generally made of low carbon steel equivalent to 5IOC in consideration of magnetic properties, while the coil spring 6 is made of piano wire (SWPΔ).

Note that the input rotor 1 and the sub-armature 16 are respectively provided with sills 16a and 16a extending in the circumferential direction in order to effectively form a magnetic circuit.

Next, the operation of the electromagnetic spring clutch of this embodiment in the above-described configuration will be explained. First, when a voltage is applied to the excitation coil 2, the magnetic circuit section around it and both armatures 5 and 16 are magnetized, so that the sub-armature 16 is magnetically attracted to the friction surface 1a against the return force of the elastic body 14. At the same time, the main armature 5 becomes the sub armature 16.
is magnetically attracted to. Therefore, the rotational force of the human-powered rotor 1 is transmitted to the sub-armature 16, but a part of the rotational force is transmitted to the output hub 4 and the driven shaft 3 via the ring 151, elastic body 14, and cover 7. The main armature medium 5 winds the coil spring 6 onto the cylindrical portion lb of the input rotor 1 and the outer peripheral surface 4a of the hub 4 while rotating relative to the human-powered rotor 1 and the sub-armature 16 with sliding friction. One torque of the input rotor 1 is transmitted to the hub 4 by the tightening frictional force.Therefore, the coil splinter 6 smoothly wraps around the cylindrical portion 1b and the outer circumferential surface 4a, thereby preventing generation of impact torque and impact noise.

On the other hand, when the excitation coil 2 is de-energized, the magnetic attraction force disappears, and the sub-armature 16 and the main armature 5 are pulled back to the U-shaped flange 7a of the spring cover 7 by the reaction force of the elastic body 14, and at the same time, the coil spring 6 is the cylindrical portion 1b of the input rotor 1 due to the self-returning force.
, and torque transmission is reliably released.

In the above-described embodiment, the elastic body 14 made of rubber was used as the return force for the sub-armature 16, but as shown in FIG. An elastic body 19 made of the above may be disposed, and the return force of the sub-armature 16 may be obtained by this elastic body 19. That is, the ring-shaped elastic body 1
Sub-armature I with rivets 20 at multiple locations of 9.
At the same time, other parts of the elastic body 19 are connected to the outer circumference of the ring cover 7 with rivets (not shown). You may also obtain In the example shown in FIG. ff13, it is of course possible to use a plurality of elongated leaf springs as the elastic body 19 instead of the link-like leaf spring.

Furthermore, in FIG. 2, the ring 15 may be omitted and the elastic body 14 may be directly fixed to the sub-armature 16.

〔Effect of the invention〕

As explained above, according to the present invention, the sub armature 16 is disposed between the input rotor l and the main armature 5,
By coupling this sub-armature 16 to the spring cover 7 via a return means made of an elastic body, it is highly effective to significantly reduce the impact when winding the coil spring 6.

Moreover, in the structure of the present invention, the elastic body 14 serving as the return means
．． 19 Since the main armature 5 is held between the sub armature 16 and the spring cover 7 using the axial reaction force of the armature 1, even if two armatures 5 and 16 are used, the elastic body 14゜19 only needs to be provided at one location, and the structure is extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the clutch of the present invention, FIG. 2 is a cross-sectional view of the main part of FIG. 1, and FIG. 31 is a cross-sectional view of the main part showing another embodiment of the clutch of the present invention. . ■...Input rotor, ■b...Cylindrical portion, 2...Exciting coil, 3...Driven shaft, 4...Output hub, 5...
・Main armature, 6...Coil spring, 7.
...Sgeling cover, 14.19...Elastic body, 16
... Sazono'-macha. Representative Patent Attorney Takashi Okabe Figure 1

Claims (1)

[Claims] A human-powered rotor to which rotation is transmitted from a drive source, a friction surface formed on one end surface of the input rotor, a cylindrical portion protruding from one end surface of the input rotor, and opposing the friction surface of the human-powered rotor. an installed main armature, an output hub coupled to the driven shaft, an output hub provided around the outer peripheral surface of the output hub and a cylindrical portion of the human powered U-tater, one end of which is latched to the main armature, and the other end of which is provided. a coil spring whose end is locked to the output hub; a spring cover formed to cover the outer peripheral side of the spring and attached to the output hub; and a friction surface of the input rotor. and n; 1, and is connected to the spring cover via a return elastic body, and the axial reaction force of the elastic body causes the main armature to connect to the spring cover 0; A sub-armature is sandwiched between the sub-armature and the main armature.
11. A spring clutch is equipped with an excitation coil that attracts the friction surface of the human-powered rotor.