A pair of wear grooves for a linear drive assembly. One wear groove is disposed on a wear plate attached to a crosshead. This wear groove is on a front edge of the wear plate, and does not intersect any lubrication groove. Another wear groove is disposed circumferentially about an inner wall of a crosshead guide. Each of the wear grooves is observable to an operator without fully disassembling the crosshead and the crosshead guide, and each is observable from a single side of the crosshead guide. Should the wear groove not be observable, the associated component should be replaced. Should the wear groove be observable, the remaining life of the component can be determined from the groove's depth.

A pair of wear grooves for a linear drive assembly. One wear groove is disposed on a wear plate attached to a crosshead. This wear groove is on a front edge of the wear plate, and does not intersect any lubrication groove. Another wear groove is disposed circumferentially about an inner wall of a crosshead guide. Each of the wear grooves is observable to an operator without fully disassembling the crosshead and the crosshead guide, and each is observable from a single side of the crosshead guide. Should the wear groove not be observable, the associated component should be replaced. Should the wear groove be observable, the remaining life of the component can be determined from the groove's depth.

Proposed is a motor-integrated continuously variable transmission. The motor-integrated continuously variable transmission includes an input shaft, a planetary gear, a driven shaft, a first link shaft rotated by receiving power, a link actuator, a shift lever adjusting a shift ratio of the link actuator, an output shaft, a motor shaft, a deceleration gear, and a one-way clutch mounted on the deceleration gear. The link actuator includes an eccentric disk eccentrically rotated around the first link shaft, a cam performing a vertical reciprocating motion, a first link connected to the cam and configured to transmit power to the output shaft, and a one-way clutch provided between the first link and the output shaft and configured to transmit power only in one direction. As the first link shaft is rotated by the driven shaft, the first link shaft and the output shaft are driven in the same rotation direction.