JPS5877927A - Electromagnetic particle type clutch - Google Patents

Abstract

PURPOSE:To form an uniform toroidal micro-gap, by a method wherein a hub of a rotor engages a bearing previously positioned and secured to a center of a bearing support which is fastened coaxially with a annular cylinder secured to a flywheel. CONSTITUTION:In a bearing support 37, secured to an outer bend surface of a annular cylinder 32, a cylindrical hub 37a is monolithically formed at the center of the bearing support, and a ball bearing 38 is previously positioned in the hub 37. A rotor 40, attached to an input shaft 20 at the inside of the annular cylinder 32, is provided with a hub 40c mating the inner lace of the ball bearing 38 at the center thereof. The hub 40c is positioned and secured in an axial direction by a snap ring 41, and this permits the formation of an uniform annular micro-gap C in a position in an axial direction of the rotor 40 against the annular cylinder 32 and between the inner peripheral surface of the annular cylinder 32 and the outer peripheral surface of the rotor 40.

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 solidified by the magnetic force generated by energizing an electromagnetic coil built into the driving rotating body. Various types of electromagnetic particle clutches that connect both rotating bodies have been proposed, but when this type of electromagnetic particle clutch is assembled into a vehicle transmission, it is necessary to It is required to uniformly form the magnetic particles between the two rotating bodies to distribute the magnetic particles uniformly so that the magnetic force can effectively act, and to increase the responsiveness of the engagement operation between the two rotating bodies as much as possible. In addition, in this type of electromagnetic particle clutch, a labyrinth mechanism is required to prevent leakage of the magnetic particles stored inside, with the simplest structure possible depending on the shape of the component parts and assembly conditions. be done.

In order to meet such demands, the present invention can secure the above-mentioned annular gap with high precision using a simple assembly structure, and
The present invention aims to provide an electromagnetic particle clutch that can effectively prevent leakage of magnetic particles with a simple structure, and examples thereof will be described below with reference to the drawings.

In FIG. 1 of the drawings, reference numeral 10 indicates an output shaft of a vehicle internal combustion engine, and reference numeral 20 indicates an input shaft of a transmission arranged coaxially with the output shaft 1o.

The electromagnetic particle clutch of this embodiment includes a flywheel 81 fixed to one end of an output shaft 1° by a bolt 11;
A cylindrical portion 81 formed on the outer circumference of this flywheel 81 &
It is provided with an annular cylinder 82 which is fitted and assembled into the cylinder. The annular cylinder 82 has a built-in annular electromagnetic coil 88, and its − side end surface 82a is connected to the side end surface 8 of the flywheel 81.
1 (A cross-sectional annular flange 84, which is in close contact with the flywheel 81 and welded to its outer circumferential surface, is brought into close contact with an annular flange 81b formed on the outer circumference of the flywheel 81, so that both annular flanges 8
4.81b are tightened with bolts 85 to be integrally fixed to the flywheel 81. During this assembly, the base end 5 of the annular labyrinth plate 50 is located between the one side end surface 82 & of the annular cylinder 82 and the side end surface 810 of the flywheel 81.
By interposing the GB, the same freight 50 is coaxially positioned and fixed. For this purpose an annular cylinder 8
An annular notch 82b is formed in the inner circumferential portion of one side end surface 82& of 2.

A tip end 50b of the labyrinth plate 50 faces a cylindrical inner circumferential surface 40a formed on one side of a rotor 40, which will be described later, with a small gap therebetween.

The bearing support 87, which is detachably fixed to the outer end surface of the annular cylinder 82 with bolts 86, is a disc-shaped member having a cylindrical hub 87a integrally formed in its center. A ball bearing 88 is pre-assembled in 87&. In this case, the ball bearing 88 connects its outer race to the hub 87.
The outer race is positioned and fixed in the axial direction by a snap ring 89 that is press-fitted into the hub 871% and fixed to the hub 871%. Further, the bearing support 87 has an annular notch 87d on the outer periphery of the side wall, and the annular step 37e of the notch 87d and the annular notch 82d formed on the other side end surface 82 (+) of the annular cylinder 82 are connected to each other. By fitting, the above-mentioned ball bearing 88 is arranged concentrically at the center of the annular cylinder 82. At the time of this assembly, the annular notch 82d formed on the other end surface 82C of the annular cylinder 32 and the side end surface 87f of the bearing support 87. The plate 51 is coaxially positioned and fixed by interposing the proximal end 51 & of the annular labyrinth spray 51 therebetween.

The tip 51b of the labyrinth plate 51 protrudes into an annular notch 4Qb formed on the other side of the rotor 40, which will be described later, with a small gap provided therein.

The rotor 40, which is assembled to the input shaft 20 inside the annular cylinder 82, has a hub 40C fitted in the inner race of the ball bearing 88 at its center. By positioning and fixing the annular cylinder 8 of the rotor 40
2, and a minute annular gap G is accurately and uniformly formed between the inner circumferential surface of the annular cylinder 32 and the outer circumferential surface of the rotor 40. Also, rotor 4
As shown in FIG. 2, four bolts 42 are installed in the body part 40d of the 0 in the axial direction, and a pair of disc-shaped plates with a hub member 45 interposed between these bolts 42 48.48 through the sleeve 44, and each bolt 4
By tightening and fixing a nut 46 screwed onto the plate 2, the pub member 45 is held under pressure by both the plates 48 and 48.

As shown in FIG. 2, the hub member 45 has dampers 47 assembled at four locations in the central direction, and these dampers 47 fit into the window holes 488 provided in each plate 48. It is received and engaged with each predetermined window hole end face.

In the assembly process of the electromagnetic particle clutch configured as described above, the pair of plates 48, 48 that hold the hub member 45 under pressure are attached to the body portion 40 of the rotor 40 as described above.
6, the hub 40c of the rotor 40 is fitted to the inner race of the ball bearing 88 previously assembled to the bearing support 87 to fix its axial position, and then the labyrinth plate 50 is attached to the flywheel 81. A required amount of magnetic particles is stored inside the annular cylinder 82 assembled together with the rotor 40 by appropriate means, and then the rotor 40 is accommodated in the annular cylinder 82 and the bearing support 87 is attached to the other end surface 820 of the annular cylinder 82 together with the labyrinth plate 51. All assembly work is completed by fixing the hub member 45 to the rotor 40, and in use, the hub member 45 assembled to the rotor 40 is splined to the input shaft 20 of the transmission. In this 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, and when the electromagnetic coil 88 is energized, two points shown in the figure are formed. When the magnetic flux shown by the chain line is generated, the rotation of the annular cylinder 82 causes the rotor 4 to
Scattered around 0! The magnetic particles are uniformly interposed in the annular gap G by magnetic force and solidified, resulting in an engaging operation with good responsiveness.

Further, around the rotor 40, a labyrinth plate 5
The tip end 50t+ of the rotor 40 is connected to the cylindrical inner circumferential surface 40 &
The tip 51b of the labyrinth plate 51 is opposed to the rotor 40 and thrust into the annular notch 40b to form a labyrinth, and these labyrinths prevent the magnetic particles stored inside from leaking out.

This leakage prevention of magnetic particles is achieved by making the concentricity of the rotor 402 and the labyrinth plates 50, 51 highly accurate due to the above-described configuration, and between the cylindrical inner circumferential surface 40B of the rotor 40 and the tip end 50b of the labyrinth plate 50. This can be effectively achieved because both the gap and the gap between the annular notch 40b of the rotor 40 and the tip 51b of the labyrinth plate 51 can be set to be much smaller than shown in the drawings.

As understood from the above description, in the present invention, the hub (400) of the rotor (40) is fitted into a bearing (ball bearing 88) that is pre-positioned and fixed at the center of the bearing support (87). The pairing sabot (87) is fixed concentrically to the annular cylinder (82) fixed to the flywheel (81), and its base is fixed on both sides of the annular cylinder (32). A pair of annular labyrinth plates (50, 51) whose ends (50a, 51a) are fixed are provided, and a tip (50) of one of these annular labyrinth plates (50) is provided.
0b ) on the negative side of the rotor (40) with a small gap provided to the cylindrical inner circumferential surface (40a), and the tip (51b) of the other (51) on the other side of the rotor (40). The structure is characterized by the fact that a minute gap is provided in the annular notch (40b) formed in the ring, and this allows the mass-produced C type electromagnetic particle clutch to have a close contact with the outer peripheral surface of the rotor. A predetermined minute annular gap can be uniformly and accurately formed between the inner circumferential surfaces of the annular cylinder, and solidification of magnetic particles by magnetic force can be appropriately promoted, resulting in highly responsive zero-engagement operation. In addition, the concentricity of the rotor and both labyrinth plates can be made highly accurate, and the gap between the rotor and both labyrinth plates can be set extremely small, and leakage of magnetic particles can be effectively prevented by simplifying the structure. I can do it.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an electromagnetic particle clutch according to the present invention, and FIG. 2 is a partially cutaway front view of a hub member with a damper assembled to the clutch. Explanation of symbols 10... Output shaft, 20... Input shaft, 81...
・Flywheel, 82...Annular cylinder, 88・
...Electromagnetic coil, 36...Volt, 87...
Bearing support, 87a...Hub, 88...
・Ball bearing (bearing), 40...Rotor, 4
0B...Cylindrical inner peripheral surface, 40b...Annular notch, 40C...Hub, 50.51...Labyrinth plate, 50B, 51a...Proximal end, 50b
, 51b... Tip. Applicant Aisin Seiki Co., Ltd. Agent Patent Attorney Teru Hase

Claims (1)

[Claims] An annular cylinder containing an electromagnetic coil removably fixed to the side end surface of a flywheel fixed to the output shaft of the prime mover, a bearing support removably concentrically fixed to the side end surface of the annular cylinder, and the bearing support. A transmission comprising a bearing pre-positioned and fixed in the center of the cylinder, and a hub fitted with the bearing and fixed in its axial position, and arranged coaxially with the output shaft inside the annular cylinder. a rotor assembled to the input shaft, a predetermined annular gap in which magnetic particles can be interposed between the inner circumferential surface of the annular cylinder and the outer circumferential surface of the rotor; A pair of annular labyrinth plates are provided whose base ends are fixed, and one tip of these annular labyrinth plates is provided with a minute gap on a cylindrical inner peripheral surface formed on one side of the rotor. A minute gap is formed in annular notches that are opposed to each other, and the other tip is formed on the other side of the rotor. An electromagnetic particle clutch that is applied with a force.