Slide bearing device for a rotating shaft of a vehicle driving motor

A slide bearing device for rotatably supporting a rotating shaft of a vehicle driving motor, the slide bearing device comprising:

• a metal substrate having a cylindrical shape and including an inner peripheral surface, an outer peripheral surface, and two axial end surfaces;
• a housing including one or more bearing holding holes each holding the metal substrate, and capable of internally housing a rotor, a stator and at least a part of the rotating shaft provided in the vehicle driving motor;
• and
• a lubricant inlet portion to introduce lubricant from an outside to an inside of the housing, wherein
• the metal substrate includes one or more opening paths provided to communicate between the inner peripheral surface and the outer peripheral surface,
• the housing includes one or more communication paths each having one opening communicating with the corresponding opening path of the metal substrate on the outer peripheral surface side and another opening that opens to the outside or the inside of the housing,
• a lubricant supply path to supply the lubricant introduced to the inside of the housing by the lubricant inlet portion toward the inner peripheral surface serving as a bearing sliding surface is secured between the inner peripheral surface of the metal substrate and an outer peripheral surface of the rotating shaft,
• when the metal substrate is disposed to cause a center axis of the metal substrate to intersect a plane perpendicular to a gravity acting direction at an angle of 10 degrees or less, an axis of each of the opening paths is disposed within a range of an angle around the center axis of 90 degrees from a gravity line along the gravity acting direction, and each of the opening paths is disposed near a center part in a width direction along an axis direction of the metal substrate,
• each of the communication paths provided in the housing is provided to cause an entire path from the one opening toward the other opening not to be directed to a direction opposite to the gravity acting direction, and
• a minimum diameter B of a cross-section perpendicular to an axis direction of each of the opening paths of the metal substrate and a minimum diameter R of a cross-section perpendicular to an axis direction of the corresponding communication path of the housing satisfy relationship represented by the following expression (1).
• B
• ≤
• 2
• ⁢
• R
• (
• 1
• )