Machine element or mechanism – Engine starters – Automatic
Patent
1982-08-11
1985-01-29
Herrmann, Allan D.
Machine element or mechanism
Engine starters
Automatic
74 7A, F02N 1506
Patent
active
044958250
DESCRIPTION:
BRIEF SUMMARY
The invention relates generally to a starter for internal combustion engines and more particularly to a starter in which the starter motor is connected to the starter pinion by means of a spur gear arrangement having an internally geared wheel, a freewheel, and a coupling element around the gear shaft.
BACKGROUND
In a known starter of this type, the internally geared wheel of the spur gear arrangement is separately embodied and, adjoining the gear shaft, is secured via an axial gearing on the gear shaft to a high-pitch thread in a positively engaged manner. The disadvantage of such an arrangement is that the connection between the internally geared wheel and the gear shaft is relatively weak, and the internally geared wheel has a relatively short seated length on the gear shaft, presenting the danger of premature wear caused by breakage and canting.
A spur gear arrangement is also known, the internally geared wheel of which is provided with a bearing extension. Although the internally geared wheel having the bearing extension is pressed onto the gear shaft, still the pressure connection between them is sufficient for transmission of only a certain maximal torque. If this maximal torque is exceeded, then the internally geared wheel and the gear shaft rotate at different speeds. Although this effect is exploited for the purpose of shock absorption, still the relatively long structure is disadvantageous, because the high-pitch thread section of the gear shaft on which the coupling element of the free wheel is seated must be disposed following the area where the bearing extension of the internally geared wheel is secured.
THE INVENTION
Briefly, the starter for internal combustion engines of the present invention, with its coupling element disposed on a highly pitched spirally splined sleeve, and its internally geared wheel journalled on the spur gear shaft, has the advantage that the internally geared wheel, which is embodied in one piece with the sleeve, has a long guideway length on a relatively thin gear shaft (thus saving raw materials), with which it does not have to be rigidly connected because at the same time the internally geared wheel also includes the high-pitch thread section. As a result, the structural length of the starter can be kept shorter, and the thin gear shaft is not required to be a part which transmits torque.
By means of the integral formation of the splined sleeve and internally geared wheel, and the cover cap sealingly surrounding the internally geared wheel advantageous further embodiments of the starter disclosed in claim 1 are possible. It is particularly advantageous that by embodying the internally geared wheel having the high-pitch thread sleeve as an extruded or injection-molded plastic part, the number of separate parts can be reduced, thus also reducing the cost of assembly. Furthermore, the space-saving embodiment and disposition mean that with simple means, lubricant leakage from the gear arrangement can be prevented.
DRAWING
The single FIGURE shows a starter seen partially in longitudinal section.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
A starter has a starter motor 1 having a housing 2, in which an exciter winding 3 is secured. A drive shaft 4 carries an armature 5 and a commutator 6. The drive shaft 4 is rotatably supported with its end toward the commutator in a bearing cap 7 and with its other end in an intermediate casing 8. In a manner known per se, the bearing cap 7 and intermediate casing 8 are secured, each to a respective end of the housing 2, with tie rods 9. On the other end of the intermediate casing 8, a drive bell 10 is screwed in place in a manner also known per se and not shown in further detail. Parallel to the intermediate casing 8, an engagement relay 12 is secured to the drive bell 10 with screws 13, a sealing element 11 being disposed between the relay 12 and drive bell 10.
In the intermediate casing 8, there is a first bearing bore 14, in which a bearing 15 is inserted, in which the drive shaft 4 is rotatably received. One end of the dri
REFERENCES:
patent: 2998729 (1961-09-01), Warsaw
patent: 3024780 (1962-03-01), Hamman
patent: 3182515 (1965-05-01), Klein
patent: 3922558 (1975-11-01), Hollyoak
patent: 4104926 (1978-08-01), Wilson
patent: 4192195 (1980-03-01), Kazino et al.
patent: 4346615 (1982-08-01), Yoneda et al.
Patent Abstracts of Japan, Band 4, No. 128 (m-31) (610) Sep. 9, 1980, and Band 4, No. 147 (M-36) (629) Oct. 16, 1980.
Herrmann Allan D.
Robert & Bosch GmbH
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