US 5,269,730 AGranted

Differential gear device for vehicle

AssigneeTochigifujisangyo Kabushiki Kaisha

InventorIsao Hirota

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Abstract

A differential gear device for a vehicle is disclosed. The differential gear device is provided with a planetary gearing for producing differential motion having a ring gear with a toothed portion, and an electro-magnetic multiple clutch for limiting the differential motion. The electro-magnetic clutch is provided with a plurality of outer friction plates and a plurality of inner friction plates alternately positioned with the outer friction plates. An outer rotary member made of a nonmagnetic substance and integrally joined to the ring gear is provided for the electro-magnetic multiple clutch. A support member is made of a magnetic substance and conducts a magnetic force from the electro-magnet to the armature through the outer and inner friction plates to attract the armature to engage the outer and inner friction plates in cooperation with the armature. The support member is connected with the outer rotary member.

Claims4

Dependent claims

A differential gear device for a vehicle, comprising:

(a) a planetary gearing for producing a differential motion, including a ring gear with a toothed portion;
and
(b) an electro-magnetic multiple disc clutch for limiting the differential motion, including
(1) a plurality of outer friction plates,
(2) a plurality of inner friction plates alternately positioned with said outer friction plates,
(3) an outer rotary member made of a nonmagnetic substance, integrally joined to said ring gear and provided with a toothed portion for engaging said outer friction plates,
(4) an inner rotary member with a toothed portion for engaging said inner friction plates;
and
(5) an electromagnet for engaging said outer and inner friction plates,
(6) an armature attracted by said electromagnet to engaging said outer and inner friction plates;
and
(7) a support member made of a magnetic substance, conducting a magnetic force from said electromagnet to said armature through said outer and inner friction plates to attract said armature, engaging said outer and inner friction plates in cooperation with said armature, said support member connected with said outer rotary member.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/921,561Filed 29 Jul 1992 · continuation in part
Priority: JP 2-58764[U]5 Jun 1990
Granted: 14 Dec 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

F16H 48/22
Arrangements for suppressing or influencing the differential action, e.g. locking devices: using friction clutches or brakes
B60K 17/3462
The transfer gear being a differential gear: with means for changing distribution of torque between front and rear wheels
F16D 43/216
With flat friction surfaces, e.g. discs: with multiple lamellae
F16H 48/10
With gears having orbital motion: with orbital spur gears