Power transmission device
First Claim
1. A driving force transmission device comprising:
- a worm having an outer casing defining on the outer peripheral surface thereof a helical first groove having a substantially arcuate section, and an inner cylinder mounted in said outer casing and provided on the outer peripheral surface thereof with a helical groove, said outer casing having ball transfer holes at both ends of said first groove and communicating with the helical groove in said inner cylinder;
a worm wheel provided on the outer peripheral surface thereof with a second groove having a substantially arcuate section and opposed to said first groove;
a plurality of balls rollably and loosely fitted in said helical groove in said inner cylinder, said first groove and said second groove; and
frame rings mounted on said worm at both ends thereof for preventing the balls from floating out of said first groove.
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Accused Products
Abstract
A driving force transmission device includes a worm meshing with a worm wheel. The worm has an outer casing defining a first helical groove on the outer peripheral surface thereof, and an inner cylinder mounted in the outer casing and provided on the outer peripheral surface thereof with a helical groove. The outer casing has ball transfer holes at both ends of the first groove and which transfer holes communicate with the helical groove in the inner cylinder. A plurality of balls are rollably and loosely fitted in the helical groove in the outer periphery of the inner cylinder, the first groove in the outer periphery of the outer casing and the second groove in the outer periphery of the worm wheel. The balls circulate between the helical groove in the outer periphery of the inner cylinder and the first helical groove in the outer periphery of the outer casing via the ball transfer holes. Frame rings mounted on the worm at both ends thereof prevent the balls from floating out of the first groove.
16 Citations
3 Claims
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1. A driving force transmission device comprising:
- a worm having an outer casing defining on the outer peripheral surface thereof a helical first groove having a substantially arcuate section, and an inner cylinder mounted in said outer casing and provided on the outer peripheral surface thereof with a helical groove, said outer casing having ball transfer holes at both ends of said first groove and communicating with the helical groove in said inner cylinder;
a worm wheel provided on the outer peripheral surface thereof with a second groove having a substantially arcuate section and opposed to said first groove;
a plurality of balls rollably and loosely fitted in said helical groove in said inner cylinder, said first groove and said second groove; and
frame rings mounted on said worm at both ends thereof for preventing the balls from floating out of said first groove. - View Dependent Claims (2, 3)
- a worm having an outer casing defining on the outer peripheral surface thereof a helical first groove having a substantially arcuate section, and an inner cylinder mounted in said outer casing and provided on the outer peripheral surface thereof with a helical groove, said outer casing having ball transfer holes at both ends of said first groove and communicating with the helical groove in said inner cylinder;
Specification