Taper roller bearing

A taper roller bearing comprising:

• an outer ring that has a raceway surface at an inner periphery thereof;
• an inner ring that has a raceway surface at an outer periphery thereof;
• a retainer that is arranged between the outer ring and the inner ring, includes a smaller diameter annular portion and a large diameter annular portion and is formed with pockets by connecting the small diameter annular portion and the large diameter annular portion by a plurality of column portions having a linear shape;
• and
• taper rollers that are arranged between the raceway surface of the outer ring and the raceway surface of the inner ring and contained in the pockets,
• wherein a portion of the small diameter annular portion of the retainer opposed to a small diameter end face of the taper roller is disposed on an inner side in a radial direction of a pitch conical face of the taper roller and a portion of the large diameter annular portion opposed to a large diameter end face of the taper roller is disposed on an outer side in the radial direction of the pitch conical face of the taper roller,
• wherein a radially outer end surface of a small diameter side of the column portions is located on a radially inner side of the pitch conical face, and
• wherein a radially inner end surface of a larger diameter side of the column portions is located on a radially outer side of the pitch conical face.

A taper roller bearing comprising:

• an outer ring;
• an inner ring;
• a retainer arranged between the outer ring and the inner ring, includes a smaller diameter annular portion and a large diameter annular portion and is formed with pockets by connecting the small diameter annular portion and the large diameter annular portion by a plurality of column portions having a linear shape;
• a taper roller arranged between the outer ring and the inner ring;
• and
• means for facilitating an advance of lubricant between the inner ring and the retainer, comprising an end face on an inner side in a radial direction of the large diameter annular portion, wherein the end face is disposed on an outer side in the radial direction of a pitch conical face of the taper roller,
• wherein a radially outer end surface of a small diameter side of the column portions is located on a radially inner side of the pitch conical face, and
• wherein a radially inner end surface of a larger diameter side of the column portions is located on a radially outer side of the pitch conical face.