§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0280544A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power transmission system for a four-wheel drive vehicle

Assignee: Subaru Corp
•
Filing: 1988-02-25
•
Granted: —
•
Expires: 2008-02-25
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A power transmission system for a four-wheel drive vehicle has an automatic transmission (A) for transmitting power of an engine (E) to main driving wheels and a transfer clutch (10) for transmitting the power to auxiliary driving wheels. First and second vehicle speed sensors are provided for sensing vehicle speed dependent on the main driving wheels and the auxiliary driving wheels, respectively. A two-wheel drive switch (23) is provided for producing a two-wheel drive signal. The automatic transmission (A) uses an output signal of the first vehicle speed sensor (26) as a data representing driving conditions of the vehicle. In response to the two-wheel drive signal, the transfer clutch (10) is disengaged and an output signal of the second vehicle speed sensor (25) is selected as a vehicle speed.

Inventors

  • 👤 Ryuzo Sakakiyama

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 20:52
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60K23/0808; F; F16; F16H; F16H61/00; F16H61/12

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 118 words
A power transmission system for a four-wheel drive vehicle powered by an engine comprising: a transmission for transmitting power of said engine to main driving wheels of said four-wheel drive vehicle; a transfer clutch for transmitting said power to auxiliary driving wheels; means for producing a vehicle speed signal from the output of a wheel speed sensor; characterised by: a first wheel speed sensor operating onto said main driving wheels, and a second wheel speed sensor operating on said auxiliary driving wheels; a two-wheel drive switch for producing a two-wheel drive signal; and control means responsive to said two-wheel drive signal for disengaging said transfer clutch and for selecting the output signal of said second vehicle speed sensor.
Claim 2
Dependent Claim 118 words
A power transmission system for a four-wheel drive vehicle powered by an engine comprising: a transmission for transmitting power of said engine to main driving wheels of said four-wheel drive vehicle; a transfer clutch for transmitting said power to auxiliary driving wheels; means for producing a vehicle speed signal from the output of a wheel speed sensor; characterised by: a first wheel speed sensor operating onto said main driving wheels, and a second wheel speed sensor operating on said auxiliary driving wheels; a two-wheel drive switch for producing a two-wheel drive signal; and control means responsive to said two-wheel drive signal for disengaging said transfer clutch and for selecting the output signal of said second vehicle speed sensor.
Claim 3
Dependent Claim 14 words
A power transmission system according to claim 1 wherein said clutch is friction clutch.
Claim 4
Dependent Claim 27 words
A power transmission system according to claim 1 wherein said transmission is an automatic transmission using the vehicle speed signal to the driving conditions of said vehicle

References Cited (Backward Citations)

EP0043237B1 Cited
GB2104178A Cited
US4556134A Cited
DE3313182A1 Cited
GB2132146A Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag