US4757728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All-wheel limited slip differential system in the power train of a motor vehicle
Assignee: Dr Ing HCF Porsche AG
•
Filing: 1987-02-13
•
Granted: 1988-07-19
•
Expires: 2007-02-13
Abstract
Abstract An all-wheel limited slip differential system in the power train of the front axle and the rear axle of a motor vehicle has an intermediate planetary transmission in the direct through drive and a clutching device engageable at its planetary carrier. The planetary transmission includes an inlet ring gear that is torsionally fixed with respect to the drive shaft, and an outlet ring gear having a slightly smaller number of teeth that is disposed coaxial and adjacent to the inlet ring gear and is torsionally fixed with respect to an output shaft. The planetary transmission also has several planetary wheels engaging jointly with both ring gears, the planetary wheels connected to planetary carrier and rotating together with it.
Inventors
- 👤 Hermann Pitsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:17
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/04; B60K17/16; F; F16; F16H; F16H48/00; F16H48/06; F16H48/10; B60K17/34; B60K17/348; B60K17/35; B60K17/3505; F16H2048/104
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
An all-wheel limited slip differential system in a power train of a front axle and a rear axle of a motor vehicle, having an intermediate planetary transmission in the direct through drive and a clutching device engageable at its planetary carrier, the gear ratio for a direct through drive deviating slightly from 1:1, but the gear ratio to the clutching device being significantly higher, the planetary transmission comprising: an inlet ring gear that is torsionally fixed with respect to a drive shaft; an outlet ring gear having a slightly different number of teeth that is coaxial and adjacent to said inlet ring gear and is torsionally fixed with respect to an output shaft; and at least one planetary wheel that engages jointly with both ring gears, and is connected to the planetary carrier and rotates together with said planetary carrier.
Claim 2
Dependent Claim
140 words
An all-wheel limited slip differential system in a power train of a front axle and a rear axle of a motor vehicle, having an intermediate planetary transmission in the direct through drive and a clutching device engageable at its planetary carrier, the gear ratio for a direct through drive deviating slightly from 1:1, but the gear ratio to the clutching device being significantly higher, the planetary transmission comprising: an inlet ring gear that is torsionally fixed with respect to a drive shaft; an outlet ring gear having a slightly different number of teeth that is coaxial and adjacent to said inlet ring gear and is torsionally fixed with respect to an output shaft; and at least one planetary wheel that engages jointly with both ring gears, and is connected to the planetary carrier and rotates together with said planetary carrier.
Claim 3
Dependent Claim
57 words
A limited slip differential system according to claim 1, wherein the clutching device comprises a clutching member that is connected in a torsionally fixed manner with the planetary carrier; and a counterclutching member interacting with said clutching member, said counterclutching member being connected with the output shaft connected to the rear axle in a torsionally fixed manner.
Claim 4
Dependent Claim
47 words
A limited slip differential system according to claim 2, said system including a housing for tightly enclosing said system, said housing comprising a cylindrical shell and two flat front sides, the output shaft being mounted on the outside of said housing at one of said front sides.
Claim 5
Dependent Claim
24 words
A limited slip differential system according to claim 3, wherein the counterclutching member and the outlet ring gear are fixedly mounted in the housing.
Claim 6
Dependent Claim
45 words
A limited slip differential system according to claim 3, wherein the front sides of the housing have bearing means for bearing a central drive shaft that is coaxial with the output shaft, the clutching member and the planetary carrier being disposed on said drive shaft.
Claim 7
Dependent Claim
21 words
A limited slip differential system according to claim 2, wherein the clutching member and the counterclutching member form a hydrodynamic clutch.
Claim 8
Dependent Claim
29 words
A limited slip differential system according to claim 6, wherein the clutching member and the counterclutching member are developed as bladed half-shells that enclose an oil-filled torus-shaped flow space.
Claim 9
Dependent Claim
21 words
A limited slip differential system according to claim 1, wherein the clutching member and the counterclutching member form a centrifugal clutch.
Claim 10
Dependent Claim
23 words
A limited slip differential system accordig to claim 1, wherein the clutching member and the counterclutching member form an electrical eddy current clutch.
Claim 11
Dependent Claim
21 words
A limited slip differential system according to claim 1, wherein the clutching member and the counterclutching member form a band clutch.
Claim 12
Dependent Claim
21 words
A limited slip differential system according to claim 1, wherein the clutching member and the counterclutching member form a lamella brake.
References Cited (Backward Citations)
US2368873A
Cited
US3374692A
Cited
US3705522A
Cited
US3828877A
Cited
US4347763A
Cited
US4520691A
Cited
US4601359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |