Gear, reduction gear combination and electric power steering apparatus
First Claim
1. A gear comprising:
- an annular tooth body having a tooth on an outer surface thereof, a core body inserted inside the annular tooth body; and
a coupler made of elastic material, which couples the core body with the annular tooth body.
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Accused Products
Abstract
A worm 1 is composed of an annular tooth body 11 having a tooth 10 on the outer surface thereof, a core body 12 inserted inside the annular tooth body 11; and an elastic coupler 13, which can be transformed in the radial direction, for coupling the core body 12 with the annular tooth body 11. The worm 1 is engaged with the worm wheel with the elastic coupler 13 being transformed in the radial direction in such a manner that a negative amount of backlash is generated at the engagement portion. This can be also employed for the worm wheel. With a reduction gear combination having this structure, the backlash amount at the engagement portion can be adjusted to a proper amount without selecting elements such as the worm and the worm wheel to be assembled.
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Citations
18 Claims
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1. A gear comprising:
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an annular tooth body having a tooth on an outer surface thereof, a core body inserted inside the annular tooth body; and
a coupler made of elastic material, which couples the core body with the annular tooth body. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A reduction gear combination comprising a pinion and a gear wheel engaged with the pinion,
wherein at least one of the pinion and the gear wheel has: -
an annular tooth body having a tooth on an outer surface thereof;
a core body inserted inside the annular tooth body; and
a coupler made of elastic material, which couples the core body with the annular tooth body. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An electric power steering apparatus comprising:
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a reduction gear combination including a pinion and a gear wheel engaged with the pinion;
a steering assist motor connected with the pinion; and
a transmitting unit for transmitting rotation of the gear wheel associated with rotation of the motor to a steering mechanism, wherein at least one of the pinion and the gear wheel has;
an annular tooth body having a tooth on an outer surface thereof, a core body inserted inside the annular tooth body; and
a coupler made of elastic material, which couples the core body with the annular tooth body. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification