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US 9,878,735 B2Granted
Worm reduction gear and steering system
AssigneeJtekt Corporation
InventorArata Kikuchi
Life of this patent
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Abstract
A worm reduction gear satisfies following relational Formula (1) and Formula (2): 3≧D2/D1≧1.7 (1) 0.1°≦α−β≦0.5° (2) where D1 is an outside diameter of a worm, D2 is an outside diameter of a hob for cutting a worm wheel to form tooth spaces, and α is a pressure angle of the worm wheel and β is a pressure angle of the worm at an intermeshing pitch circle of the worm and the worm wheel.
Claims2
A worm reduction gear comprising:
- a worm;
- and
- a worm wheel including tooth spaces that mesh with the worm, wherein following relational Formula (1) and Formula (2) are satisfied:
- 3≧D2/D1≧1.7 (1)
- 0.1°≦α−β≦0.5° (2)
- where D1 is an outside diameter of the worm, D2 is an outside diameter of a hob for cutting the worm wheel to form the tooth spaces, and α is a first acute angle formed by a reference line extending along a radial direction of the worm wheel with a worm wheel tooth flank and β is a second acute angle formed by the reference line with the worm tooth flank at an intermeshing pitch circle of the worm and the worm wheel.
3 more elements
Dependencies are inferred from the claim text.