Methods of retarding injection timing of mechanical unit injectors using a modified pump follower
US7191766B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2006 |
| Grant date | Mar 20, 2007 |
| Priority date | — |
| Expiry date | Apr 4, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/8092
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A modified pump follower device (2) and method of retarding injection timing of EMD-type unit injectors by a desired amount of crank degrees includes the steps of providing a modified pump follower (2) whose plunger engagement location, also known as t-slot (7), varies depending on the desired amount of retarding. Specifically, the modified pump follower (2) has a t-slot (7) which has a predetermined distance t′ on the modified pump follower (2), as compared to conventional pump followers having a predetermined distance t, such that the t-slot (14) is closer to the top face (9) of the pump follower (2). The difference in spacing between the original timing t and the retarded timing t′ is r, which is an amount equal to the amount of retardation, in linear units, that corresponds to the desired amount of retardation in crank degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.