US4991679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four wheel-drive anti-locking braking
Assignee: Honda Motor Co Ltd
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Filing: 1986-06-19
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Granted: 1991-02-12
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Expires: 2006-06-19
Abstract
Abstract A four-wheel-drive vehicle in which the brakes are individually controlled to prevent locking. According to the invention, during anti-locking brake, the torque transmitted between the front and rear wheels is reduced, either by disconnecting the inter-axle transmission or switching to a loosely coupled viscous coupling.
Inventors
- 👤 Etsuo Fujii
- 👤 Makoto Sato
- 👤 Seiichi Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:00
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60K23/0808; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/322
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A four-wheel-drive vehicle, comprising: a set of front wheels; a set of rear wheels; brakes on all said wheels; anti-locking means for preventing locking of at least one of said rear wheels; and a motive power transmission system linking said front wheels and said rear wheels, whereby braking torque applied to said front wheels is transmitted to said rear wheels; wherein said power transmission system includes means for reducing braking torque transmitted from said front wheels to said rear wheels when said anti-locking means are operating.
Claim 2
Dependent Claim
86 words
A four-wheel-drive vehicle, comprising: a set of front wheels; a set of rear wheels; brakes on all said wheels; anti-locking means for preventing locking of at least one of said rear wheels; and a motive power transmission system linking said front wheels and said rear wheels, whereby braking torque applied to said front wheels is transmitted to said rear wheels; wherein said power transmission system includes means for reducing braking torque transmitted from said front wheels to said rear wheels when said anti-locking means are operating.
Claim 3
Dependent Claim
26 words
A vehicle as recited in claim 1, wherein said anti-locking means comprises a braking oil pressure controller for controlling braking oil pressure applied to said brakes.
Claim 4
Dependent Claim
78 words
A four-wheel-drive vehicle as recited in claim 1, wherein said motive power transmission system comprises: an axle for each of said wheels; a front differential providing motive power to each of the axles of said front wheels; a rear differential providing motive power to each of the axles of said rear wheels, said front and rear differentials being normally connected together in four-wheel drive; and wherein said reducing means comprises means for disconnecting said front and rear differentials.
Claim 5
Dependent Claim
25 words
A four-wheel-drive vehicle as recited in claim 3, wherein said disconnecting means comprises a clutch on a drive shaft linking said front and rear differntials.
Claim 6
Dependent Claim
21 words
A four-wheel-drive vehicle as recited in claim 3, wherein said disconnecting means comprises means for releasing locking of a central differential.
Claim 7
Dependent Claim
60 words
A four-wheel-drive vehicle as recited in claim 1, further comprising: a pair of front axles providing motive power to said front wheels; a pair of rear axles providing motive power to said rear wheels; a motive power unit coupled to one of said pairs of axles; and wherein said motive power transmission includes a clutch usable as said reducing means.
Claim 8
Dependent Claim
24 words
A four-wheel-drive vehicle as recited in claim 6, wherein said motive power transmission further includes a first viscous coupling in parallel with said clutch.
Claim 9
Dependent Claim
24 words
A four-wheel-drive vehicle as recited in claim 9, further comprising a second viscous coupling in series with said first viscous coupling and said clutch.
Claim 10
Dependent Claim
43 words
A four-wheel-drive vehicle as recited in claim 8, wherein each of said viscous couplings comprises a plurality of clutch disks spline-coupled alternately to an input member and to an output member of said each viscous coupling and disposed in a sealed oil-filled chamber.
Claim 11
Dependent Claim
26 words
A four-wheel-drive vehicle as recited in claim 8, wherein power transmission efficiency of said second viscous coupling is higher than that of said first viscous coupling.
Claim 12
Dependent Claim
50 words
A four-wheel-drive vehicle as recited in claim 3, wherein said disconnecting means comprises two power transmitting members arranged coaxially, a freely rotatable member, gear mechanism adapted to connect said two power transmitting members together in response to braking of said rotatable member, and a brake for braking said rotatable member.
Claim 13
Dependent Claim
67 words
A four-wheel-drive vehicle as recited in claim 11, wherein said gear mechanism comprises a first large gear connected to one of said power transmitting members, a second large gear connected to the other power transmitting member, first and second small gears in meshing engagement with said first and second large gears, and a rotary member connected to a rotary shaft of said first and second small gears.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |