Adjusting device for damping force of rear shock-absorbers of motorcycles
US4159756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1978 |
| Grant date | Jul 3, 1979 |
| Priority date | — |
| Expiry date | Jan 17, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/44
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The rear shock-absorber unit which suspends the rear wheel of motorcycles is provided with a device for adjusting the damping force produced by the hydraulic damper. The said adjusting device incorporates a passage which is provided in the piston rod so as to permit the fluid to flow throughout the upper and lower working chambers of the damper cylinder which are separated by the piston, and an adjusting member which is engaged, rotating freely, with the piston rod and covers one of the ports of the passage. The said adjusting member has a group of orifices, different in diameter, which connect successively to the said passage in the piston rod, and click stops which, at their respective positions, constrain the relative rotary motion between the adjusting member and piston rod. When the hydraulic damper reaches the extreme of expansion, it is pressed against a seal holder or stop rubber attached to the upper end of the damper cylinder to prevent the rotary motion. Thus, as the piston rod is rotated from the outside, the adjusting member and piston rod undergo a relative rotary displacement, and the orifice group of the adjusting member is selectively matched with the passage in th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.