Baffle plate and transmission provided with the same

A baffle plate in a transmission, the transmission comprising a machine room defined in a casing and accommodating a plurality of gears including a differential gear, a control room accommodating a mechanism for hydraulic pressure control arranged adjacent to the machine room in a casing and an oil sump section formed in the machine room between an inside surface of the casing and a side surface of the differential gear, the baffle plate arranged to separate between the differential gear and the oil sump section, the baffle plate comprising:

• a body section arranged on the side of the differential gear and having at a center thereof an opening into which a rotation shaft of the differential gear is penetrated;
• a first drain section formed on a surface of the oil sump section side of the body section for leading oil scooped up in the machine room by the differential gear to the control room;
• a peripheral rib formed on part of a periphery of the body section;
• a notch section disposed on the peripheral rib and forming, between the inside surface of the casing and itself, a communicating passage for letting oil flow from the control room to the machine room;
• a slit-shaped through-hole formed on a peripheral side of the opening of the body section;
• and
• a second drain section formed under the through-hole on the surface of the oil sump section side of the body section and guiding oil scooped up by the differential gear and having passed via the through-hole to a shaft support of the differential gear.