gearcase

n.

齿轮箱，变速箱壳体，（自行车的）齿轮罩；

Gearcase service tool
Computer Simulation and Calculation for Heat Transfer in Gear case
Spray shield for surface-piercing gearcase
Transmission housing for mounting a transmission between a driveshaft housing and a lower gearcase in an outboard motor
Marine drives having exhaust systems that discharge exhaust gas through a gearcase housing
Apparatuses and methods for servicing lubrication in a lower gearcase of an outboard marine engine
Chapter Eight -- Gearcase -- Propeller Removal and Installation
Cutter head containing its motors and gearcase
Chapter Eight -- Gearcase -- Gearcase Service Precautions
Chapter Two -- Troubleshooting -- Gearcase Troubleshooting