Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1995-08-16
1997-08-12
Herrmann, Allan D.
Machine element or mechanism
Gearing
Directly cooperating gears
74458, F16H 116
Patent
active
056554109
ABSTRACT:
A worm type reduction gear mechanism includes a worm, a multiplicity of balls, a ball receiving outer cylinder, a body casing and a worm wheel. A worm shaft is formed with at least one helical ball race and therein with a ball circulation passage extending therethrough and communicating with the ball race to form a circulation circuit. The balls are arrayed in the ball race and the ball circulation passage of the worm shaft and are allowed to run therein and circulate therethrough. The ball receiving outer cylinder is formed with meshing holes and fits the worm rotatably so that the balls may contact with the inner face of the ball receiving outer cylinder. The worm wheel is rotatably supported in the body casing and formed in its circumference with ball meshing teeth which are cut at the pitch or lead interval of the ball race. The balls of the worm are arranged so as to mesh with the ball meshing teeth of the worm wheel in the meshing holes of the ball receiving outer cylinder thereby to transmit the power. As the worm rotates, the balls move endlessly, while being in rolling contact with the inner face of the ball receiving outer cylinder, along the ball race and the ball circulation passage so that they efficiently transmit the rotational force to the worm wheel by the rolling contact with the ball meshing teeth of the worm wheel.
REFERENCES:
patent: 3190138 (1965-06-01), MacChesney
patent: 3468179 (1969-09-01), Sedgwick et al.
patent: 4951519 (1990-08-01), Ohtsuka
patent: 5090266 (1992-02-01), Otsuka
patent: 5373753 (1994-12-01), Toyomasa
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