EP0049961A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Transmission system for a four-wheel drive vehicle
Assignee: Subaru Corp
•
Filing: 1981-09-17
•
Granted: —
•
Expires: 2001-09-17
Abstract
Abstract In a vehicle driven by an internal combustion engine, a transmission system transmits power from the engine to a main pair of driving wheels and optionally to the second pair of driving wheels through an electromagnetic clutch (17) controlled by a selection switch (28). A brake switch (31) applies a brake signal to control circuit (29) forthe clutch (12) when the brake pedal (30) is depressed through a predetermined stroke, with the result that four wheel drive is automatically established.
Inventors
- 👤 Hayashi Kageyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 11:18
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60W; B60W2540/00; B60W2540/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A transmission system for a vehicle driven by an internal combustion engine, including a transmission (5, 13, 14) for transmitting drive power to a first pair of vehicle wheels, a clutch (17) for selectively transmitting power to a second pair of vehicle wheels, selection means (28) for effecting engagement of the clutch (17), means (31) for generating a brake signal on a predetermined depression of the vehicle brake (30), and a control circuit (29) responsive to the brake signal for automatically engaging the clutch (17) and thereby establishing four-wheel drive.
Claim 2
Dependent Claim
90 words
A transmission system for a vehicle driven by an internal combustion engine, including a transmission (5, 13, 14) for transmitting drive power to a first pair of vehicle wheels, a clutch (17) for selectively transmitting power to a second pair of vehicle wheels, selection means (28) for effecting engagement of the clutch (17), means (31) for generating a brake signal on a predetermined depression of the vehicle brake (30), and a control circuit (29) responsive to the brake signal for automatically engaging the clutch (17) and thereby establishing four-wheel drive.
Claim 3
Dependent Claim
32 words
A vehicle transmission system as claimed in claim 1, in which the clutch (17) is an electromagnetic clutch and the selection means (28) generates a signal for the engagement of the clutch.
Claim 4
Dependent Claim
20 words
A vehicle transmission system as claimed in claim 1 or claim 2, in which the transmission is an automatic transmission.
Claim 5
Dependent Claim
40 words
A vehicle having an internal combustion engine, two pairs of drive wheels, and a transmission system as claimed in any one of the preceding claims for transmitting drive from the engine optionally to one or both pairs of drive wheels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.