JPS5865333A - Electromagnetic particle clutch - Google Patents

Abstract

PURPOSE:To absorb misalignment between both output and input shafts and improve a clutch response, by securing an annular cylinder to the output shaft of a prime mover, connecting a rotor to the input shaft of a speed changer and concentrically building the rotor in said annular cylinder in a relatively rotatable state. CONSTITUTION:Internal diameter of a fitting hole 43b, provided in the center of each disc plate 43, is formed larger than external diameter of a hub 45a of a clutch disc 45. While a semi-circular slit 45b is provided in a corresponding part to a bolt 42 of the clutch disc 45, and the clutch disc 45 is built radially in a relatively movable state between both the disc plates 43, 43. In this way, eccentric assembly of a rotor 40, caused by relative misalignment between an output shaft 10 and input shaft 20, can be surely avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic particle clutch, particularly an electromagnetic particle clutch suitable for use in a vehicle transmission.

Conventionally, powdered magnetic particles are interposed in an annular gap formed between a driving rotating body and a driven rotating body, and these magnetic particles are attracted and solidified by the magnetic force generated by energization of an electromagnetic coil built into the driving rotating body. Various types of electromagnetic particle clutches have been proposed in which the two rotating bodies are connected together, but when this type of electromagnetic particle clutch is used in a vehicle transmission, When the output shaft of the prime mover to which the driving rotary body is fixed and the input shaft of the transmission to which the driven rotary body is coupled are arranged with relative misalignment in the radial direction, a shaft is formed between the two rotary bodies. Since the annular gap is eccentrically formed in either direction ζ in the radial direction, there is a risk of abnormal wear and damage to the fitting surfaces of both rotating bodies.

In order to deal with such problems, the present invention provides a motor in which a rotor provided as a driven rotating body is assembled in advance so as to be relatively rotatable concentrically to an annular cylinder provided as a driving rotating body, and the annular cylinder is fixed. When there is a radial misalignment between the output shaft of the rotor and the input shaft of the transmission to which the rotor is connected, the electromagnetic system is designed to absorb the misalignment of both shafts between the connecting members to the input shaft of the rotor. We intend to provide a particle type clutch, and examples thereof will be described below with reference to the drawings.

In FIG. 1 of the drawings, reference numeral IO indicates an output shaft of a vehicle internal combustion engine, and reference numeral 20 indicates an input shaft of a transmission disposed coaxially with the output shaft IO.

The electromagnetic particle clutch of this embodiment includes a flywheel 31 fixed to the outer end of an output shaft 10 by bolts 11, and a cylindrical portion 81 formed on the outer periphery of this flywheel 81.
It is provided with an annular cylinder 32 that is fitted and assembled into B.

The annular cylinder 32 has a built-in annular electromagnetic coil 38, and its inner end surface 82a is connected to the side end surface 8 of the flywheel 31.
1e and welded to its outer circumferential surface is brought into close contact with an annular flange stb formed on the outer circumference of the flywheel 31, so that both annular flanges 34
Tighten ゜81b with bolts 85 and attach the flywheel 8.
1 is integrally fixed. Incidentally, during this assembly, the blenoid 36 is positioned and fixed by interposing the base end of the annular labyrinth plate 36 between the inner end surface 82a of the annular cylinder 32 and the side end surface 810 of the flywheel 31. Therefore, the inner end surface 8 of the annular cylinder 32
An annular notch 82b is formed in the inner peripheral portion of 2B.

The bearing support 38, which is removably fixed to the outer end surface of the annular cylinder 82 with bolts 87, has a cylindrical hub 88a integrally formed at its center and an annular labyrinth protrusion 88b integrally formed on its inner wall surface. The hub 88 of the bearing support 38
A ball bearing 39 is positioned and fixed by a snap ring 88e that is engaged with a knob 88a.

The rotor 40, which is assembled to the input shaft 20 inside the annular cylinder 32, has a hub 40a fitted to the inner race of the ball bearing 89 at its center. By positioning and fixing the annular cylinder 32 of the rotor 40
The assembly position in the axial direction is accurately determined, and a minute annular gap G is accurately and uniformly formed between the inner circumferential surface of the annular cylinder 82 and the outer circumferential surface of the rotor 40. Further, as shown in FIG. 2, four bolts 42 are installed in the body portion 40b of the rotor 40 in the axial direction, and a pair of discs with a clutch disc 45 interposed between these bolts 42 are installed. By inserting the plates 48 and 48 through the sleeve 44 and tightening and fixing the nuts 42B screwed onto each bolt 42, the clutch disc 45 is connected to both the plates 1-48.
．． It is held under pressure by 48. As shown in FIG. 2, dampers 46 are installed on the clutch disc 45 at four locations in the circumferential direction. It is housed and engaged in a ball-like manner with the end face of each predetermined window hole.

In such a configuration, the fitting hole 48b provided at the center of each disc plate 43 fits into the hub 45 of the clutch disc 45.
The hub 45a has an inner diameter larger than the outer diameter of the hub 45a, thereby forming an annular gap C between the inner circumferential end surface of each disk plate 43 and the outer circumferential surface of the hub 45a.

On the other hand, a semicircular notch 45b is provided in a portion of the clutch disc 45 corresponding to the bolt 42, and the annular notch 45b is provided inside the window hole 48B of each plate 48 corresponding to each damper 46 assembled to the clutch disc 45. A gap having approximately the same width as the gap C is provided in the radial direction. Thus, in this embodiment, the clutch disc 45 is assembled between the two disc plates 48 and 43 so as to be relatively movable in the radial direction.

In the assembly process of the electromagnetic particle clutch configured as described above, the pair of disc plates 48 and 48 that hold the clutch disc 45 under pressure are fixed to the body portion 40b of the rotor 40 as described above. The hub 40a of the rotor 40 is fitted into the inner race of the ball bearing 39 which has been positioned and fixed in advance to the bearing support 88 to fix its axial position, and then a required amount of magnetic particles is suitably placed inside the annular cylinder 32. Then, the rotor 40 is housed in the annular cylinder 32 and the bearing support 38 is fixed to the outer end surface of the annular cylinder 82, thereby completing all assembly operations. Both disc plates 48.
A clutch disc 45 held and assembled by 48 is splined to the input shaft 20 of the transmission, and a flywheel 31 integral with the annular cylinder 32 is fixed to the output shaft IO of the prime mover. By the way, when assembling this, the output shaft l
If O and the input shaft 20 are arranged with relative misalignment in the radial direction, the clutch disc 45 is moved in the radial direction between the two disc plates 48, 48 and assembled,
Eccentricity in the radial direction of the rotor 40 due to misalignment between the shafts 10 and 20 is not caused.

In addition, in the above assembly configuration, a predetermined minute annular gap G is uniformly formed between the outer circumferential surface of the rotor 40 and the inner circumferential surface of the annular cylinder 82 inside the annular cylinder 82. When the magnetic flux shown by the two-dot chain line in the figure is generated by energization, the rotor 40 is rotated by the rotation of the annular sill 32.
The magnetic particles scattered around the annular gap G are uniformly interposed and solidified in the annular gap G by magnetic force, resulting in an engaging operation with good responsiveness. Further, around the rotor 40, the tip r of the labyrinth plate 36 faces the cylindrical inner circumferential surface of the rotor 400, and the tip of the labyrinth protrusion 88b provided on the bearing support 38 faces the tapered inner circumferential surface of the rotor 40. A labyrinth is formed, and these labyrinths prevent the magnetic particles stored inside from leaking out.

As understood from the above description, in the present invention, as a means for assembling the rotor (40) to the input shaft (20), a clutch disc (45) coupled to the input shaft, and a clutch disc (45) coupled to the input shaft (45) (7) Hough (45a
), a pair of disc plates (48, 48) are used, which are loosely fitted into the latch plate and hold the latch take under pressure, and which are integrally fixed to the rotor (40) at the outer circumferential portion thereof. When there is a relative misalignment in the radial direction between the input shafts (20), the clutch disc (45) can be assembled with a misalignment in the radial direction between the two disc plates (48, 48). This feature of the structure makes it possible to reliably avoid eccentric assembly of the rotor (40) caused by relative misalignment between the output shaft and the input shaft, and to ensure that the rotor (40) is integrated with the output shaft. A minute annular gap (G) is uniformly formed between the inner circumferential surface of the annular cylinder (32) that rotates in a circular motion and the outer circumferential surface of the rotor (40), resulting in a highly responsive engagement operation.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an electromagnetic particle clutch embodying the present invention, and FIG. 2 is a partially cutaway front view showing the mounting structure of a clutch disc with bolts assembled into the clutch. Explanation of symbols 1O...Output axis, 20...Input axis, 31...
・Flywheel, 82...Annular cylinder, 33・
... Electromagnetic coil, 38 ... Bearing support,
40... Rotor, 43... Disc play 1-
14311...fitting hole, 44...-sleeve,
45...Clutch disc, 46...Damper,
G: Annular gap, C: Annular gap. Applicant Aisin Seiki Co., Ltd. Agent Patent Attorney Teru Hase - Figure 1 Figure 2

Claims (1)

[Claims] An annular cylinder having a built-in electromagnetic coil that rotates integrally with the output shaft of the prime mover, and a rotor that is assembled to the input shaft of the transmission disposed coaxially with the output shaft inside the annular cylinder. In the electromagnetic particle clutch, the magnetic particles stored in the electromagnetic coil are attracted to an annular gap formed between the inner circumferential surface of the annular cylinder and the outer circumferential surface of the rotor by the magnetic force generated by energization of the electromagnetic coil, and are solidified. As a means for assembling the rotor to the input shaft,
A clutch disc coupled to the input shaft, and a pair of disc plates that are loosely fitted into the hub of the clutch disc, hold the clutch disc under pressure, and are integrally fixed to the rotor at the outer peripheral portion thereof. An electromagnetic particle clutch, wherein when there is a relative misalignment between the output shaft and the input shaft, the clutch disc is assembled with a radial position shift between the two disc plates.