Connecting piece for vent valve and gearbox

The utility model provides a connecting piece used for connecting a vent valve to a shell of equipment to be ventilated, one end of the connecting piece is used for being connected to the shell of the equipment, the other end of the connecting piece is used for being connected to the vent valve, and an air channel is formed in the connecting piece so that the vent valve can be communicated with the interior of the equipment. The air conditioner is characterized in that a stop piece is arranged in the air channel. By arranging the stop piece in the air channel, lubricating oil thrown up due to rotation of the gear in the equipment can be prevented from leaking to the outside at the ventilation position. The utility model further relates to a gearbox comprising the vent valve and the connecting piece. 本实用新型提供了一种用于将通气阀连接到要被通气的设备的壳体的连接件，所述连接件的一端用于联接到所述设备的壳体，另一端用于联接到所述通气阀，所述连接件内形成有空气通道，以便使所述通气阀与所述设备的内部联通，其特征在于，在所述空气通道内设置有止挡件。通过在空气通道内设置止挡件，能够防止设备内的由于齿轮的旋转而甩起的润滑油在通气位置泄漏到外部。本实用新型还涉及一种包括通气阀和连接件的变速箱。