Cam follower of a valve train of an internal combustion engine i

Details Cam follower of a valve train of an internal combustion engine i Cam follower of a valve train of an internal combustion engine i

1998-11-16

2000-05-02

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Plural valve trains, single actuator

123 904, 123 9046, 74559, F01L 126, F01L 124, F01L 118

Patent

active

060559519

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention concerns a cam follower of a valve train of an internal combustion engine in the form of a finger lever or a rocker arm.


BACKGROUND OF THE INVENTION

Such a cam follower is known, for example, from DE-OS 44 27 706. This is configured as a finger lever which is pivoted at one end on a pivot axis. This finger lever, or finger lever system, is provided in the prior art for the simultaneous loading of two gas exchange valves. Opposite the pivot axis in the lever system, there are positioned two hydraulic clearance compensation elements which act directly on identically operating gas exchange valves. As can be seen, for example, in FIG. 3 of the prior art document, a separate radial passage is arranged in the pivot axis for the supply of hydraulic medium to each clearance compensation element. Starting from this radial passage, another separate passage to each clearance compensation element is provided in the lever system. These separate passages disadvantageously increase the costs of manufacture of the entire system. At the same time, since the hydraulic medium is routed through the edge region of the lever system, considerable losses of hydraulic medium can occur, so that the conveying capacity of the hydraulic medium pump has to be increased.


OBJECTS OF THE INVENTION

It is therefore the object of the invention to create a lever of the initially described type in which the mentioned drawbacks are eliminated and in which, particularly, the hydraulic medium losses encountered in the prior art and the costs of manufacture of such hydraulic medium bores are minimized. It is intended at the same time to create a lever by which the gas exchange process of the internal combustion engine is additionally optimized.


SUMMARY OF THE INVENTION

This object is achieved according to the invention by a cam follower of a valve train of an internal combustion engine in the form of a finger lever or a rocker arm for the simultaneous loading of three identically operating gas exchange valves: valves with a bottom surface, the finger lever comprising at another end, and the rocker arm comprising approximately centrally, a pivot; loadable at another end on a bottom surface at least indirectly by at least one cam; exchange valves, hydraulic clearance compensation elements cooperating therewith; starts from a bore of the pivot wherein; next to a central transverse plane of the lever; cross-passage in the form of a through-bore, into which cross-passage the passage opens; cross-bore, there is fixed a hollow bolt on which a cam-contacting element configured as a rotatable ring is arranged.
Due to the sole central passage now provided by the invention which, further, is particularly intended for use in a lever for loading three identically operating gas exchange valves, the hitherto encountered hydraulic medium losses are strongly minimized. The reason for this, among other things, is that the hydraulic medium supply into the lever system is now no longer effected in the edge region but in the region of a central transverse plane of the cam follower. Thus, the leak gap length at the rotational contact is positively enlarged. Again, the sole oil passage for the supply of hydraulic medium also minimizes the costs of manufacture because the further oil passages can be dispensed with. However, the scope of the invention does not only cover solutions pertaining to levers for the simultaneous loading of three or two gas exchange valves. A larger number of identically operating gas exchange valves is also conceivable.
A simple measure for conveying the hydraulic medium to the individual consumers is a cross-passage in the form of a through-bore is arranged at the end of the central passage, and the clearance compensation elements are disposed in this cross-passage. A configuration is also conceivable in which the axes of the clearance compensation elements are not arranged 100% parallel to the central transverse plane of the lever or do not intersect the cross-passage exactly centrally.
In a furth

REFERENCES:
patent: 4638774 (1987-01-01), Aoi
patent: 5463988 (1995-11-01), Paul
patent: 5829400 (1998-11-01), Speil et al.

Affiliated with

Also associated with

Rating

Cam follower of a valve train of an internal combustion engine i does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cam follower of a valve train of an internal combustion engine i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cam follower of a valve train of an internal combustion engine i will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1585809