Interaxle transfer mechanism for four wheel drive vehicles

Details Interaxle transfer mechanism for four wheel drive vehicles Interaxle transfer mechanism for four wheel drive vehicles

1989-08-21

1991-02-26

Diehl, Dwight

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Control of differential planetary gearing

74665T, 180233, F16H 144.5, F16H 142

Patent

active

049958623

ABSTRACT:
For a part time four wheel drive vehicle, auxiliary drive power is handled by an interaxle transfer mechanism comprising a braked differential gear set interposed in the vehicle's auxiliary motive power path, providing, in addition to the normal two wheel drive mode and front-rear-locked four wheel drive mode, a limited-slip-auxiliary four wheel drive mode. The differential gear set may be of the planetary or bevel gear type; its reaction gear is coupled to a braking unit, preferably of the hydraulic disk-pad-caliper type which is readily accessible and highly serviceable. The transfer mechanism is typically interposed concentrically at the driven end of the vehicle's auxiliary driveshaft, and may be retrofitted onto existing vehicles of the type having a gear or chain driven offset auxiliary driveshaft by adding an extension gear casing which carries the braking unit externally. To maintain a 1:1 through ratio for retrofitting existing vehicles, a complementary gear ratio may be provided, for example by a second differential gear set, with its reaction gear locked, interposed concentrically in tandem with the braked differential gear set. A control panel and controller module provide driver selection of at least the three basic modes and may be made programmable to provide selected automatic capabilities such as release from locked four wheel drive above a predetermined steering angle, temporary locked four wheel drive kick-in upon loss of traction as sensed by a tachometer monitoring rotation of the transfer braking unit rotor, and release to two wheel drive whenever operation of the vehicle's anti-lock wheel braking system is sensed. The driver may be provided with an adjustable control to regulate the slippage in the limited slip mode. Two braked differential transfer units m ay be provided in a vehicle, one acting on the front wheels and the other acting on the rear wheels, to provide ultimate flexibility in five different drive modes: two wheel front, two wheel rear, four wheel front-rear-locked, four wheel main-front/limited-slip-rear, and four wheel main-rear/limited-slip-front.

REFERENCES:
patent: 3963085 (1976-06-01), Vinton
patent: 4691593 (1987-09-01), Mueller
patent: 4718301 (1988-01-01), Friderich
patent: 4729259 (1988-03-01), Lanzer
patent: 4779487 (1988-10-01), Pitsch et al.
patent: 4787269 (1988-11-01), Matsumoto
patent: 4846298 (1989-07-01), Naito

Affiliated with

Also associated with

Rating

Interaxle transfer mechanism for four wheel drive vehicles does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interaxle transfer mechanism for four wheel drive vehicles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interaxle transfer mechanism for four wheel drive vehicles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-291980