Two and four-wheel drive transfer device
US4862989A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Sep 27, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19284
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A two-wheel and four-wheel drive transfer device includes a reciprocating fork shaft having a shift fork engagable with a sliding dog clutch so as to reciprocate the dog clutch and provide either two-wheel and four-wheel drive operating conditions. A motor is provided so as to rotate a worm gear assembly which is relatively rotatable with an output shaft supported in a casing. This worm gear is connected to and rotates a plate concurrently with rotation of the worm gear. A spring support plate is provided to be secured to the output shaft and two spiral springs, each spring being wound in a different direction and having a different rotating torque, are fixed to the output shaft and have ends brought into contact with the rotating plate and the spring support plate so that the rotating torque of the worm wheel is transmitted to the output shaft through the spiral springs depending on the direction of rotation of the worm gear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.