Machine element or mechanism – Engine starters
Patent
1992-02-26
1993-09-14
Herrmann, Allan D.
Machine element or mechanism
Engine starters
74 7A, 74527, 335131, 384610, 384611, 267162, 16 24, F02N 1506
Patent
active
052438660
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a starting device for an internal combustion engine.
The invention is based on a starting device for internal combustion engines according to German Patent Specification 11 01 052. In this known device, a recess is formed at the free end face of the thrust member of the solenoid armature, which member is constructed as a switching bolt. In the recess, rubber discs are inserted and covered by a steel disc which is also inserted in the recess. On the steel disc, a sphere is loosely arranged and held in the recess by turned-over or flanged edge sections or by the entire flanged edge of the end face. In this arrangement, it is of disadvantage that the starter solenoid must already be assembled before the edge or the edge sections of the switching bolt are turned over against the sphere. It is only then that the rubber discs or else cup springs, acting as spring, are inserted into the recess, the steel disc is placed on top and the sphere is placed on. The turning-over of the edge is then carried out as precision flanging against the sphere. During this process, the sphere must be kept running easily which is made more difficult by the continuous pressure of the rubber discs or cup springs against the steel disc resting against the sphere and requires complicated measures, which are not economical in mass production for maintaining the tolerances and thus the quality of the product.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a starting device for an internal combustion engine of the above-described type which has none of the above-described disadvantages of the known starting devices.
It is also an object of the present invention to provide a starting device for an internal combustion engine of the above-described type which has a simple reliable holding arrangement for the sphere provided between the thrust member and the thrust rod suitable for economical automated mass production.
According to the invention, the starting device for an internal combustion engine comprises a starting pinion mounted on a thrust rod and movable between a position disengaged from a toothed rim of a drive of an internal combustion engine and another position engaged therewith; a movable switching bolt located in a solenoid and movable against an end of the thrust rod by energizing the solenoid; a sphere mounted at an end face of the switching bolt closest to the thrust rod; a disc and spring means arranged between the sphere and the end face of the switching bolt, the spring means being located between the disc and the end face, and holding means for retaining the sphere on the end face of the switching bolt, the holding means having a sleeve-shaped section accommodating the sphere, an end of the sleeve-shaped section being structured as a stop for the disc and the spring means and the disc being located in a recess provided in the end face of the switching bolt so that the spring means presses the disc elastically against the end of the sleeve-shaped section acting as the stop for the disc and the sphere is held in the holding means rotatably, but substantially free of play and substantially free of pressure form the spring means.
In this connection, it is of advantage that the sphere is arranged rotatably free of play and free of friction and pressure of the pretension of the spring arrangement. It must be considered as a further advantage that the component-related tolerances can be maintained more easily due to the sphere being fixed in a sleeve-shaped section.
It is particularly advantageous that the holding device, as covering cap, envelopes the sphere and enables the sphere to be accommodated with accurate tolerance in a simple manner and that, in addition, the switching bolt exhibiting the sphere and the spring and holding device can be manufactured and checked as a prefabricated structural unit in an automatable process and has support areas to enable the preassembled structural unit of switching bolt to be accurately and si
REFERENCES:
patent: 2808607 (1957-10-01), Urso
patent: 2819486 (1958-01-01), Dick
patent: 3463564 (1969-08-01), Moore
patent: 4852417 (1989-08-01), Tanaka
Herrmann Allan D.
Robert & Bosch GmbH
Striker Michael J.
Trousdell William O.
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