Sealed pin joint assembly
US5769557A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1996 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Jul 12, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/32959
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Past pin joint assemblies attaching a lift arm to a construction machine have utilized grease lubricated pins. Deflection of the pins during operation caused damage to both the pin and surrounding structure. Additionally, the use of grease requires daily lubrication schedules. The present invention overcomes these and other problems by providing an oil sealed pin joint assembly which virtual eliminates daily lubrication needs. A pin is utilized with a variable profile including first and second end portions which diverge inwardly from a first predetermined diameter and terminate at a second predetermined diameter. The second diameter is in substantial axial alignment with a contact surface of a first and second collar with first and second bearing assemblies, respectively. The pin diverges outwardly from the second diameter and terminates at a third predetermined diameter. A plurality of radii blendingly interconnect the first, second and third diameters. During operation, the pin deflects and the relative location and size of the diameters and radii promotes a uniform distribution of forces across the pin and into the surrounding structure. Uniform distribution of pin forces cause…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.