| CPC F16H 1/32 (2013.01) [F16C 3/18 (2013.01); F16H 49/001 (2013.01); F16H 2001/323 (2013.01); F16H 2049/003 (2013.01)] | 10 Claims |
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1. A speed reducer comprising:
a casing;
a speed reduction mechanism disposed in the casing and including a transmission portion, the speed reduction mechanism reducing rotation inputted from a drive source and outputting reduced rotation, the transmission portion being rotatable relative to the casing; and
a bolt protruding from the transmission portion toward outside of the casing, the bolt having a male threaded portion configured to engage with a female threaded portion provided in a connection member,
wherein internal teeth are provided on an inner periphery of the casing,
wherein the speed reduction mechanism includes:
a crankshaft connected to an input shaft of the drive source and having an eccentric portion that rotates eccentrically with respect to a rotational axis of the transmission portion; and
an oscillating gear having external teeth that mesh with the internal teeth and rotating in the casing as the external teeth move over the internal teeth in conjunction with eccentric rotation of the eccentric portion,
wherein the transmission portion rotates about the rotational axis as the oscillating gear rotates,
wherein the transmission portion includes:
a first block disposed on a first side in a direction along the rotational axis with respect to the oscillating gear, and
a second block having a base plate disposed on a second side of the oscillating gear in the direction along the rotational axis and connected to the first block,
wherein the bolt is configured to pass through a portion of the base plate that faces the oscillating gear, wherein the bolt is configured to extend in the direction along the rotational axis from the first side to the second side without passing through the first block, and
wherein the male threaded portion of the bolt protrudes from the base plate toward the outside of the casing.
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