US 5,156,578 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 an tooth portion, and a electro-magnetic multiple clutch for limiting the differential motion. The electromagnetic 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. The outer rotary member is provided with a tooth portion for engaging the outer friction plates. The tooth portion of the outer rotary member is formed to receive the outer friction plates from the tooth portion side of the ring gear and has an aperture at least larger than the thickness of one outer friction plate at the tooth portion of the ring gear. The electromagnetic clutch is provided with an inner rotary member with tooth portion for engaging the inner friction plates and a electromagnet for causing frictional engagement of the outer and inner friction plates.

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 tooth portion;
and
(b) an electro-magnetic multiple disc clutch for limiting the differential motion between a first and second output of said differential gear device, including
(1) a plurality of outer friction plates having radially outwardly extending teeth,
(2) a plurality of inner friction plates alternatively 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 tooth portion for engaging said radially outwardly extending teeth of said outer friction plates, said tooth portion of said outer rotary member being formed so as to receive said teeth of said outer friction plates from said tooth portion side of said ring gear and having an aperture at least larger than a thickness of one outer friction plate at said tooth portion of said ring gear to allow insertion and rotation of said outer friction plates in the aperature between said tooth portion of said outer rotary member and said tooth portion of said ring gear,
(4) an inner rotary member with a tooth portion for engaging said inner friction plates;
and
(5) an electromagnet for causing frictional engagement of said outer and inner friction plates to limit the differential motion between said first and second outputs.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/710,545Filed 5 Jun 1991
Priority: JP 2-58764[U]5 Jun 1990
Granted: 20 Oct 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

F16H 48/30
Arrangements for suppressing or influencing the differential action, e.g. locking devices: using externally-actuatable means
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