Engine starter with dust seal arrangement

Details Engine starter with dust seal arrangement Engine starter with dust seal arrangement

1990-08-29

1992-05-05

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

74 7A, 277152, 310 83, H02K 7118, F02N 1506, F16J 1532

Patent

active

051110938

ABSTRACT:
An engine starter for an internal combustion engine having an engine ring gear, comprising a pinion gear (8) axially slidable on the rotary shaft (3) between an actuated position in which the pinion gear (8) engages the engine ring gear through the housing opening (6) and an inactuated position in which the pinion disengages from the ring gear. The starter conventionally also comprises a unidirectional clutch (14) for unidirectionally transmitting a rotation of the rotary shaft (3) to the pinion gear (8), and a solenoid switch (18) for energizing the motor (2) and driving the pinion (8) between the actuated and the inactuated positions. A first dust seal ring (22) having a forwardly extending lip (24) between the rotary shaft (3) and the pinion (8) seals therebetween against ingress of any foreign matter. To receive the seal ring (22), the pinion (8) may have an annular cavity (25) or groove so that the lip's inner edge slidably contacts the rotary shaft (3). A second dust seal ring (27) may be disposed between the housing (1) and a cylindrical outer surface of the pinion gear (8) or a unidirectional clutch (14). A third dust seal ring (30) may also be disposed at the front end of the rotary shaft (3) for protecting a bearing surface from dust.

REFERENCES:
patent: 2626839 (1953-01-01), Creson et al.
patent: 3439963 (1969-04-01), Hein et al.
patent: 3772921 (1973-11-01), Carlson et al.
patent: 4690414 (1987-09-01), Haaland
patent: 4895035 (1990-01-01), Okamoto et al.
patent: 4929857 (1990-05-01), Isozumi
patent: 4995275 (1991-02-01), Okamoto et al.
Marlin-Rockwell, "Flange Type Seals for Ball and Roller Bearing Applications", Product Engineering, 11-48, pp. 122-123.

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