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US3794133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving apparatus for motor vehicle
Assignee: Hitachi Ltd
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Filing: 1971-10-18
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Granted: 1974-02-26
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Expires: 1991-10-18
Abstract
Abstract A driving apparatus for a motor vehicle, which employs a power transmission mechanism for transmitting the rotation of a driving motor of the motor vehicle to the driving wheels through a transmission gear mechanism, and in which in order to operate said transmission gear mechanism to a change gear ratio of large output torque at an intersection point between the revolutional speed-revolutional torque curves of an output shaft of said transmission gear mechanism as is obtained at optional change gear ratios, the revolutional speed corresponding to said intersection point between said revolutional speed-rotational torque curves is detected to automatically operate said transmission gear mechanism.
Inventors
- 👤 S Sugiura
- 👤 Y Sugiura
- 👤 T Morioka
- 👤 R Kasama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:15
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; B; B60; B60K; B60K1/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A driving apparatus for a motor vehicle, comprising a DC power source, a voltage controller, and an electric driving motor, said electric driving motor being powered by said DC power source connected thereto via said voltage controller, a transmission gear mechanism having a variable gear ratio and having an input shaft coupled to said driving motor and an output shaft, driving axle means coupled to said output shaft of said transmission gear mechanism for driving at least one wheel of the vehicle, detector means for detecting the speed of revolution of said driving axle means and for providing an output indicative thereof, and speed changing means responsive to the output of said detecting means for altering the gear ratio of said transmission gear mechanism, said speed changing means providing an increased speed reduction gear ratio of said transmission gear mechanism when the output of said speed detector means is less than an output corresponding to an output in a predetermined region of the intersection between two predetermined different revolutional speed vs. torque characteristic curves of said driving axle means.
Claim 2
Dependent Claim
179 words
A driving apparatus for a motor vehicle, comprising a DC power source, a voltage controller, and an electric driving motor, said electric driving motor being powered by said DC power source connected thereto via said voltage controller, a transmission gear mechanism having a variable gear ratio and having an input shaft coupled to said driving motor and an output shaft, driving axle means coupled to said output shaft of said transmission gear mechanism for driving at least one wheel of the vehicle, detector means for detecting the speed of revolution of said driving axle means and for providing an output indicative thereof, and speed changing means responsive to the output of said detecting means for altering the gear ratio of said transmission gear mechanism, said speed changing means providing an increased speed reduction gear ratio of said transmission gear mechanism when the output of said speed detector means is less than an output corresponding to an output in a predetermined region of the intersection between two predetermined different revolutional speed vs. torque characteristic curves of said driving axle means.
Claim 3
Dependent Claim
60 words
A driving apparatus for a motor vehicle according to claim 1, wherein said speed changing means includes an electrical level discriminator circuit for generating a signal for changing the gear ratio of the transmission gear mechanism when the ouput of said speed detecting means exceeds the output corresponding to the predetermined region of the intersection point between said two curves.
Claim 4
Dependent Claim
40 words
A driving apparatus for a motor vehicle according to claim 1, wherein said two different revolutional speed vs. torque characteristic curves of said driving axle means correspond to the curves for two different gear ratios of said transmission gear mechanism.
Claim 5
Dependent Claim
72 words
A driving apparatus for a motor vehicle according to claim 1, whereing said speed changing means includes circuit means for providing a first signal when the output of said speed detector means is less than the output corresponding to said predetermined region of the intersection point and for providing a second signal when the output of said speed detector means exceeds the output corresponding to said predetermined region of the inersection point.
Claim 6
Dependent Claim
50 words
A driving apparatus for a motor vehicle according to claim 4, wherein said first signal of said circuit means is applied to a first electro-magnetic coil for providing said increased speed reduction gear ratio and said second signal is applied to a second electromagnetic coil for providing another gear ratio.
Claim 7
Dependent Claim
42 words
A driving apparatus for a motor vehicle according to claim 4, wherein said circuit means includes a Schmitt circuit having a predetermined output applied thereto corresponding to the output of the speed detector means at the intersection point of said two curves.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |