EP0424054A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A system for controlling torque distribution in a four wheel drive vehicle
Assignee: Subaru Corp
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Filing: 1990-10-15
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Granted: —
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Expires: 2010-10-15
Abstract
Abstract A central differential (50) for splitting output torque of a transmission is formed by a complex planetary device. The planetary device comprises an input sun gear (53) operatively connected with an output shaft (15) of the transmission, a plurality of output sun gears (54, 55), a carrier (61), a pinion member (56) comprising a plurality of planetary pinions (57, 58, 59) integral with each other and rotatably supported on the carrier. Fluid operated friction clutches (71, 72, 73) are provided for selectively connecting one of the output sun gears to an output member (20) of the central differential.
Inventors
- 👤 Toshio C/O Fuji Jukogyo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:44
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60K23/0808; B60K17/00; B60K17/34; B60K17/344; B60K17/346; B60K17/3462
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
192 words
A system for controlling torque distribution in a four-wheel drive vehicle having a transmission (30) and power trains for transmitting the torques to front and rear sets of drive wheels of the vehicle; comprising, a central differential (50) having an input sun gear (53) coupled to an output shaft (15) of said transmission (30), a plurality of output sun gears (54, 55) coaxial with said input sun gear (53), a carrier (61) coupled to one set of the driving wheels of said vehicle, a pinion member comprising a plurality of planetary pinions (57 to 59) directly and coaxialy coupled to each other and each engaged with one of the sun gears (53 to 55) to form ah input planetary gear set and a plurality of output planetary gear sets, each of the output planetary gear sets having a drive ratio different to any other output planetary gear set, selecting means for engaging one of said output sun gears (54, 55) to an output member (20) coupled to another set of the drive wheels; and a control unit (90) for operating said selecting means in accordance with the driving conditions of the vehicle.
Claim 2
Independent Claim
192 words
A system for controlling torque distribution in a four-wheel drive vehicle having a transmission (30) and power trains for transmitting the torques to front and rear sets of drive wheels of the vehicle; comprising, a central differential (50) having an input sun gear (53) coupled to an output shaft (15) of said transmission (30), a plurality of output sun gears (54, 55) coaxial with said input sun gear (53), a carrier (61) coupled to one set of the driving wheels of said vehicle, a pinion member comprising a plurality of planetary pinions (57 to 59) directly and coaxialy coupled to each other and each engaged with one of the sun gears (53 to 55) to form ah input planetary gear set and a plurality of output planetary gear sets, each of the output planetary gear sets having a drive ratio different to any other output planetary gear set, selecting means for engaging one of said output sun gears (54, 55) to an output member (20) coupled to another set of the drive wheels; and a control unit (90) for operating said selecting means in accordance with the driving conditions of the vehicle.
Claim 3
Dependent Claim
17 words
The system according to claim 1, wherein said selecting means comprises fluid operated friction clutches (71, 72).
Claim 4
Dependent Claim
30 words
The system according to claim 1, wherein the drive ratio of the input planetary gear set is equal to the drive ratio of one of the output planetary gear sets.
Claim 5
Independent Claim
22 words
The system according to one of claims 1 to 3 comprising: a fluid operated multiple-disk clutch (73) to restrict the differential operation.
Claim 6
Independent Claim
33 words
The system according to any of the preceding claims, wherein said planetary pinions are arranged at the same phase; and a plurality of said pinion members are equiangularly disposed around said sun gears.
Claim 7
Independent Claim
48 words
The system according to any one of the preceding claims comprising: means for rendering said central differential operative during a period of time when said selecting means operates to select one of said output sun gears (54, 55), thereby preventing a decrease of the torque during the period.
References Cited (Backward Citations)
No citation records indexed.
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