Taper roller bearing

1. 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 an end face on an outer side in a radial direction of the small diameter annular portion of the retainer is disposed on an inner side in the radial direction of a pitch conical face of the taper roller and an end face on an inner side in the radial direction of the large diameter annular portion is disposed on an outer side in the radial direction of the pitch conical face of the taper roller.

2. The taper roller bearing according to claim 1 , 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 the 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.

3. The taper roller bearing according to claim 1 , wherein in a sectional view in an axial direction including the column portion, the small diameter annular portion, the column portion and the large diameter annular portion are extended substantially in a linear shape.

4. The taper roller bearing according to claim 1 , wherein an opening between a position of the end face on the inner side in the radial direction of the small diameter annular portion and the inner ring is smaller than and an opening between the inner ring and a position of the end face on the inner side in the radial direction of the large diameter annular portion.

5. The taper roller bearing according to claim 1 , wherein the pitch conical face of the taper roller comprises a conical surface which a rotation axis of the taper roller draws when the taper roller rolls over the inner ring about a rotation axis of the taper roller bearing.

6. The taper roller bearing according to claim 1 , wherein the column portions are disposed on the outer side in the radial direction of the pitch conical face at a center portion in an axial direction of the taper rollers.

7. The taper roller bearing according to claim 1 , wherein the column portions are disposed on the pitch conical face at a center portion in an axial direction of the taper rollers and substantially on the pitch conical face.

8. The taper roller bearing according to claim 1 , wherein the column portion is disposed on the pitch conical face at a center portion in the axial direction of the taper roller.

9. The taper roller bearing according to claim 1 , further comprising:

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

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.

10. 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.

11. 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.