Machine element or mechanism – Control lever and linkage systems – Elements
Reexamination Certificate
1999-06-18
2001-07-03
Hannon, Thomas R. (Department: 3682)
Machine element or mechanism
Control lever and linkage systems
Elements
C074S559000, C123S090390
Reexamination Certificate
active
06253636
ABSTRACT:
FIELD OF THE INVENTION
The invention is directed to a finger lever that is shaped without cutting, comprising two side walls, which are connected in a first end area by a lower wall in a U-shape which open upwardly, the lower wall has a dome shaped recess which opens downwardly for receiving a support component, in a middle area the side walls are provided with two axially aligned drill holes in which a shaft that carries a cam roller is attached and a second end area is provided with a bearing surface for a gas exchange valve of an internal combustion engine.
BACKGROUND OF THE INVENTION
A finger lever of this general type is previously known from the U.S. Pat. No. 5,016,582. This finger lever that carries in its center a cam roller consists of two parallel running side walls, which are connected at one end by a lower wall. This lower wall is provided with a dome-shaped recess which rests on a support component. On the other end, the two side walls are in turn connected by a lower wall, which forms the bearing surface for a valve stem of a gas exchange valve of an internal combustion engine.
This has the disadvantage that the activation lever is constructed very wide in the area of the valve stem bearing and as a result also has a high mass.
SUMMARY OF THE INVENTION
The purpose of the invention is thus to develop a valve stem bearing surface, which takes up as small a construction space as possible.
According to the invention, this object is achieved according to the characterizing part of claim
1
in that the bearing surface is formed by the side walls being adjacent to each other axially in the second end area so that a separation plane is formed in a longitudinal center plane of the finger lever. In this way it is achieved that the finger lever is constructed to be especially small and thus low in mass.
According to claim
2
, in the area of the separation plane, the side walls should be connected on their upper edge as a single piece with an upper edge of the outside walls, which run essentially parallel to the side walls adjacent to them and end below them. This special embodiment of the finger lever makes possible a larger degree of rigidity because of the doubled construction of the side walls in the second end area. Furthermore, a lateral guidance for the gas exchange valve is achieved by the overlapping progression of the outside wall over the side walls.
Based on a further characteristic of the invention according to claim
3
, the side walls are connected at their lower edge as a single piece in the area of the separation plane to an upper edge of the outside walls, where the outside walls are located to the right and left spaced apart at a distance parallel to the side walls and end below them.
An additional embodiment of the finger lever is provided from claim
4
. According to it, the side walls should be connected on their rear edge as a single piece with a rear edge of the outside walls, such that the outside walls in the area of the separation plane run essentially parallel to the side walls adjacent to them and end below them. Also, in this way, the rigidity described above and the bearing possibility for a valve stem can be created.
From the claims
5
and
6
it is provided that in the area of the separation plane, an accessory component functioning as a bearing surface is arranged, where this accessory component is made of a base plate and side walls extending downwardly from it, which themselves change into upwardly extending attachment walls. This accessory component makes possible an especially simple manufacture of the finger lever, since doublings of the side walls are not necessary.
Based on the additional characteristics according to claims
7
and
8
, the side walls that are adjacent to each other and/or the side walls and outside walls that are adjacent to each other are affixed to each other, which can be done, for example, by a welding operation. By this affixing of the side walls to each other, the rigidity of the finger lever is further improved.
Finally, in the first end area of the finger lever according to claim
9
, the connection of both side walls can also be done through a U-shaped upper wall that is open to the bottom.
The invention is described in greater detail in the following embodiment examples.
REFERENCES:
patent: 2425394 (1947-08-01), Ronfeldt
patent: 2483210 (1949-09-01), Leake
patent: 2490262 (1949-12-01), Gable
patent: 2572968 (1951-10-01), Bachle
patent: 3096749 (1963-07-01), Davidson
patent: 3374690 (1968-03-01), Hirose
patent: 3410366 (1968-11-01), Winter, Jr.
patent: 4245523 (1981-01-01), Wherry
patent: 5010857 (1991-04-01), Hempelmann et al.
patent: 5016582 (1991-05-01), Mills
patent: 5584267 (1996-12-01), Muir
patent: 5671707 (1997-09-01), Purcell et al.
patent: 5774984 (1998-07-01), Kotani
patent: 94 01 047 (1994-04-01), None
patent: 63-272903 (1988-11-01), None
patent: 7-259512 (1995-09-01), None
Search Report from corresponding German Application 196 45 788.2 dated Apr. 9, 1997.
Hannon Thomas R.
Ina Walzlager Schaeffler OHG
Kim Chong H.
Volpe & Koenig PC
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