Abstract: A lubrication structure of a transmission includes a gear chamber having an internal space storing lubricating oil, in which chamber a pressure is raised to a prescribed pressure, a gear chamber having an internal space communicating to the internal space through a communicating hole and attaining a pressure lower than the prescribed pressure, and an oil catch tank provided in the internal space at a position directly under the communicating hole and receiving the lubricating oil that flows into the internal space from the internal space through the communicating hole. With such a structure, a lubrication structure for a transmission capable of holding an oil level at a proper level with a simplified structure can be provided.

Abstract: A parking lock mechanism of an automatic transmission includes a casing, a parking gear provided in the casing, a parking pawl engaged with the parking gear to achieve a parking lock state, and a “parking pawl holding portion” suppressing inclination of the parking pawl in an out-of-plane direction (a direction shown with an arrow DR40). A groove portion is formed in the casing. A protruding portion is provided in a sleeve fixed to the casing. A side surface of the groove portion implements a “first portion” of the “parking pawl holding portion.” A base and protruding portion are formed from a member separate from the casing, and implement a “second portion” of the “parking pawl holding portion.

Abstract: A parking lock mechanism of an automatic transmission includes a casing, a parking gear provided in the casing, a parking pawl engaged with the parking gear to achieve a parking lock state, and a “parking pawl holding portion” suppressing inclination of the parking pawl in an out-of-plane direction (a direction shown with an arrow DR40). A groove portion is formed in the casing. A protruding portion is provided in a sleeve fixed to the casing. A side surface of the groove portion implements a “first portion” of the “parking pawl holding portion.” A base and protruding portion are formed from a member separate from the casing, and implement a “second portion” of the “parking pawl holding portion.

Abstract: A parking lock mechanism of an automatic transmission includes a parking gear provided in a casing, a parking pawl engaged with the parking gear to achieve a parking lock state, a parking rod moving in an axial direction to press the parking pawl against the parking gear, and a guide portion guiding movement of the parking rod in the axial direction. The guide portion is formed with a casing.

Abstract: An overflow tube is provided at an oil pan and when the oil pan receives an amount of a working fluid exceeding a prescribed amount the overflow tube causes the fluid to overflow to allow the fluid to have a level set at a prescribed level. The overflow tube has an end portion positioned in the oil pan and defining an opening of a drain hole receiving and passing the fluid overflowing. The end portion has a curved surface facing vertically upward and extending to surround the opening of the drain hole, and curving in a direction in contact with a generally horizontal direction. The overflow tube can thus help to set the fluid's level at a prescribed level precisely.

Abstract: A lubrication structure of a transmission includes a gear chamber having an internal space storing lubricating oil, in which chamber a pressure is raised to a prescribed pressure, a gear chamber having an internal space communicating to the internal space through a communicating hole and attaining a pressure lower than the prescribed pressure, and an oil catch tank provided in the internal space at a position directly under the communicating hole and receiving the lubricating oil that flows into the internal space from the internal space through the communicating hole. With such a structure, a lubrication structure for a transmission capable of holding an oil level at a proper level with a simplified structure can be provided.