Patent ID: 7513172
Filing Date: 2009-04-07
Classification: F16H,Y10T

Abstract:
1. A transmission apparatus comprising: a casing provided with shafts therein; a rotational member positioned in the casing at an end portion in an axial direction of the shafts, the rotational member being configured to rotate and to lift up a lubricating oil in a bottom portion of the casing so as to supply the lubricating oil to a part that is different from the end portion inside the casing; an oil passage provided along the axis line direction of the shafts, the oil passage configured to receive the lubricating oil lifted up by the rotational member at a first end portion in a longitudinal direction of the oil passage and to supply the lubricating oil through a second end portion in the longitudinal direction of the oil passage to a part inside the casing placed far away from the rotational member, the oil passage being integrally formed with the casing; and a final reduction gear unit provided at the end portion in the axis direction of the shafts and including a ring gear as the rotational member, wherein the casing is divided into a final reduction chamber placed at the end portion in the axis line direction of the shafts and housing the ring gear therein and into a transmission chamber, in which plural pairs of shift gears are housed therein, the transmission chamber is divided into a middle part transmission chamber and a front part transmission chamber by a transmission chamber dividing wall, the middle part transmission chamber being placed between the front part transmission chamber and the final reduction chamber, the oil passage receives the lubricating oil at the first end portion in the longitudinal direction of the oil passage and supplies the lubricating oil through the second end portion in the longitudinal direction of the oil passage to the front part transmission chamber, and the transmission chamber dividing wall is formed with a lower side opening at a lower end portion thereof, a dimension of the lower side opening being narrowed down for keeping an oil level of the lubricating oil required for lubricating the shift gears placed in the front part transmission chamber by the lubricating oil supplied into the front part transmission chamber from the oil passage.