Operating lever for a valve train of an internal combustion engi

Internal-combustion engines – Poppet valve operating mechanism – Rocker

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

123 9041, 123 9042, 123 9043, 74559, F01L 118, F01L 116

Patent

active

06138626&

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention concerns an operating lever for a valve train of an internal combustion engine with a sliding shoe arranged on a valve-proximate end between the operating lever and an end of a valve stem of a gas exchange valve, the sliding shoe being inseparably retained in a downwardly open recess, and spatial dimensions of the sliding shoe and the recess being matched to each other so that the sliding shoe can freely execute a pivoting movement in the recess caused by a displacement of the valve stem.


BACKGROUND OF THE INVENTION

In an operating lever of the pre-cited type known from DE-GM 84 13 255, the sliding shoe arranged in the valve-proximate region between the lever and the gas exchange valve assures that wear in the region of force transmission between the valve operating lever and the valve stem caused by the surface contact between these parts is reduced to a minimum.
A drawback of this lever is that it is a cast structure and is therefore expensive to manufacture and has a large mass. A further drawback is that the fixing of the sliding shoe in the lever is also very complicated. This is effected by a retaining pin which is anchored in the lever and projects into the sliding shoe.
U.S. Pat. No. 5,535,641 discloses a chiplessly shaped finger lever comprising a bottom wall which connects two side walls to each other so that, seen in cross-section, an upwardly open U-shaped lever is formed. However, this lever does not comprise a downwardly open recess and a sliding shoe in the valve-proximate region.


SUMMARY OF THE INVENTION

The object of the invention is therefore to create an operating lever for a valve train of an internal combustion engine which is easy to manufacture, has a small mass and retains the sliding shoe inseparably in a simple manner.
The invention achieves this object by the fact that the operating lever is configured as a chiplessly shaped sheet metal part and comprises in the valve-proximate region, a bottom wall which is connected in an upwardly open U-shape to two side walls, the bottom wall comprises the recess for receiving the sliding shoe, the sliding shoe is retained by two clips which extend beyond the longitudinal extent of the operating lever and are bent over beneath the bottom wall in the valve proximate-region while being spaced from each other at a distance which is smaller than the spatial dimension of the sliding shoe. Besides assuring the retention of the sliding shoe, these clips also serve as a lateral guide for the lever above the valve stem.
The distance between the clips is chosen so that the sliding shoe can be mounted by an elastic widening of the clips. Further, the clips can start from the bottom wall or from the side walls and be rigidly connected to the bottom wall or to the side walls in the bent-over state. This connection can be achieved, for example, by welding and assures an operating lever having a particularly stable configuration.
According to a further feature of the invention, the recess is configured as a curved surface of a circular section, i.e. as a semi-spherical depression. But it is equally possible to configure the recess as a curved surface of a cylindrical section, i.e. as a semi-cylindrical depression.
The recess can be made by a non-chipping shaping procedure such as drawing, stamping or pressing directly out of the bottom wall, or it can be made as a separate component and retained in a corresponding reception of the bottom wall by pressing, soldering or gluing.
If the recess is configured as a curved surface of a cylindrical section, i. e. as a semi-cylindrical depression, it is advantageous, for simplifying the shaping of the semi-cylindrical depression, if the surface to be curved to form the cylindrically shaped portion is separated from the side walls, i.e. if it is connected to the operating lever only at two opposing points in the region of the bottom wall.
The regions of the shaped portion which are separated for manufacturing reasons, i.e. the interrupted connection between the curved surfac

REFERENCES:
patent: 2385309 (1945-09-01), Spencer
patent: 2448989 (1948-09-01), Leake
patent: 5303680 (1994-04-01), Nielsen
patent: 5535641 (1996-07-01), Uchida et al.
patent: 5775280 (1998-07-01), Schmidt et al.
patent: 5799546 (1998-09-01), Pryba

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Operating lever for a valve train of an internal combustion engi does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

     

Profile ID: LFUS-PAI-O-2040508

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.