Oil supply structure of transmission

An oil supply structure which supplies lubricating oil to a portion to be lubricated in a casing, the oil supply structure comprising:

• an opening portion provided on a wall portion of the casing which corresponds to a shaft end portion of a rotary shaft supported by a bearing in the casing;
• and
• an oil passage configured to provide communication from the opening portion to at least the bearing, wherein
• the oil passage includes an inflow oil passage which communicates with the opening portion, and a connecting oil passage which extends obliquely upward from the inflow oil passage toward the bearing, and the opening portion is closed by a cap,
• the oil supply structure comprises a first oil passage;
• a second oil passage;
• and a third oil passage, the third oil passage includes the inflow oil passage and the connecting oil passage,
• the first oil passage communicates with a first introduction oil passage, which is provided on the wall portion of the casing, and through which lubricating oil is to be introduced into the casing, the first oil passage supplying lubricating oil into the casing from an inside of the rotary shaft,
• the second oil passage communicates with a second introduction oil passage, which is provided on the wall portion of the casing, and through which lubricating oil is to be introduced into the casing, the second oil passage supplying lubricating oil into the casing from the inside of the rotary shaft, and
• the third oil passage communicates with a third introduction oil passage, which is provided on the wall portion of the casing, and through which lubricating oil is to be introduced into the casing, the third oil passage supplying lubricating oil into the casing from the inside of the rotary shaft through the third introduction oil passage, the inflow oil passage, and the connecting oil passage,
• the third introduction oil passage is disposed at a position lower than the first introduction oil passage and the second introduction oil passage, and
• the inflow oil passage is disposed at a position lower than the connecting oil passage, wherein the inflow oil passage and the connecting oil passage are formed to have a substantially equal flow passage area.