Patent ID: 7770501

Claim:
A miter saw comprising: a base portion on which a workpiece is to be mounted; a cutting portion supporting a circular saw blade and movable toward and away from the base portion, the cutting portion comprising: a gear case serving as an outer frame and having a bearing holder formed with a bearing holding hole having first and second open ends; a motor for driving the circular saw blade; a power transmission mechanism disposed in the gear case for transmitting rotation of the motor to the circular saw blade, the power transmission mechanism including a spindle having one end provided with a blade fixing section, and another end provided with a drive gear; a bearing including an outer race fitted in the bearing holding hole of the bearing holder and disposed between the blade fixing section and the drive gear for rotatably supporting the spindle to the gear case, the first open end of the bearing holding hole facing the circular saw blade and the second open end facing the drive gear; a first bearing nip member disposed to cover at least a part of the first open end to hold one axial end of the bearing; a second bearing nip member disposed to cover at least a part of the second open end to hold another axial end of the bearing; wherein the first bearing nip member and the second bearing nip member are formed of a material having a mechanical strength higher than that of a material of the bearing holder and are fixed to the bearing holder; wherein the bearing holder has a first side facing the circular saw blade and a second side facing the drive gear; wherein the bearing holder has an inner face facing the bearing, and said bearing holder has a thickness defined at said inner face between the first side and the second side, the thickness being less than an axial length of the bearing; wherein the drive gear has one axial side facing toward the second side of the bearing holder and the second bearing nip member, the one axial side being formed with a recess; and wherein the second bearing nip member has a part protruding toward the recess and holding the another axial end of the bearing, a gap being defined between the protruding part and the recess.