摘要:
A camshaft device (10) includes a camshaft (11) onto which a cam (18) is fitted; a plurality of rolling bearings (12) that are fitted at intervals in an axial direction onto this camshaft (11); and a support frame (13) that is mounted on a cylinder head (15) of an engine, and that has a plurality of bearing holes (25) which are formed on the same axis and into which the rolling bearings (12) fitted, and that rotatably supports the camshaft (11) via the rolling bearings (12) that are fitted into the bearing holes (25). The support frame (13) is formed by connecting a plurality of split bodies (27), (28) together, and the plurality of split bodies (27), (28) includes a first split body (27) on which a plurality of first concave portions (29) that form half of the bearing holes (25) is integrally formed, and a second split body (28) on which a plurality of second concave portions (30) that form the other half of the bearing holes (25) is integrally formed.
摘要:
Among a plurality of bearings that rotatably support a camshaft (1), the bearing closest to a pulley (P) is a rolling bearing (4), and the other bearings are plain bearings (3). The rolling bearing (4) is formed of a roller bearing portion (5) that has a first outer ring raceway surface (51) and a plurality of cylindrical rollers (53) that roll on the first outer ring raceway surface (51) and a ball bearing portion (6) that is arranged next to the roller bearing portion (5) in an axial direction and that has a second outer ring raceway surface (61) and a plurality of balls (63) that roll on the second outer ring raceway surface (61). The first outer ring raceway surface (51) and the second outer ring raceway surface (61) are formed on the inner peripheral surface (7a) of a single outer ring (7).
摘要:
A conical roller cage that implements a conical roller bearing that is able to suppress torque and that is able to smoothly supply lubricant to a raceway surface includes: a small-diameter annular portion, a large-diameter annular portion having a bore diameter larger than a bore diameter of the small-diameter annular portion, pillar portions that couple the small-diameter annular portion to the large-diameter annular portion and that are located at intervals from each other in a circumferential direction, roller partition wall portions each radially extending from a radial end face of a corresponding one of the pillar portions, and canopy portions each protruding from a radial end portion of a corresponding one the roller partition wall portions, at an opposite side to a side of the pillar portion, toward both sides in the circumferential direction.
摘要:
An intake camshaft device 1 includes an intake camshaft, a first rolling bearing and a second rolling bearing for rotatably supporting both end parts of the intake camshaft, and a first sliding bearing and a second sliding bearing for rotatably supporting the intake camshaft between the first and second rolling bearings. The first rolling bearing is arranged in a same plane as a rotation plane of a sprocket for an intake cam. In other words, the first rolling bearing is positioned in a plane which is overlapped with a plurality of teeth of the sprocket for the intake cam, and perpendicular to a center axis. The first sliding bearing is disposed adjacent to the first rolling bearing backward in an axial direction.
摘要:
An outer ring has a tapered tubular portion having a tapered raceway surface, a small diameter side extension portion that extends radially outward from a small diameter side edge of the tapered tubular portion, and a large diameter side extension portion that extends from a large diameter side edge of the tapered tubular portion in a direction away from the axis of the outer ring. The small diameter side extension portion and the large diameter side extension portion are larger in thickness than the tapered tubular portion.
摘要:
A conical roller cage that implements a conical roller bearing that is able to suppress torque and that is able to smoothly supply lubricant to a raceway surface includes: a small-diameter annular portion, a large-diameter annular portion having a bore diameter larger than a bore diameter of the small-diameter annular portion, pillar portions that couple the small-diameter annular portion to the large-diameter annular portion and that are located at intervals from each other in a circumferential direction, roller partition wall portions each radially extending from a radial end face of a corresponding one of the pillar portions, and canopy portions each protruding from a radial end portion of a corresponding one the roller partition wall portions, at an opposite side to a side of the pillar portion, toward both sides in the circumferential direction.
摘要:
An intake camshaft device 1 includes an intake camshaft, a first rolling bearing and a second rolling bearing for rotatably supporting both end parts of the intake camshaft, and a first sliding bearing and a second sliding bearing for rotatably supporting the intake camshaft between the first and second rolling bearings. The first rolling bearing is arranged in a same plane as a rotation plane of a sprocket for an intake cam. In other words, the first rolling bearing is positioned in a plane which is overlapped with a plurality of teeth of the sprocket for the intake cam, and perpendicular to a center axis. The first sliding bearing is disposed adjacent to the first rolling bearing backward in an axial direction.
摘要:
In a cage, parallel portions are formed that face a raceway surface of a inner ring in a radial direction and that extend in an axial direction from a small diameter side of a tapered raceway surface toward a side of a large flange part. Grooves extending in the axial direction are formed on inner surfaces of the parallel portions. Between the tapered raceway surface of the inner ring and the inner surfaces of the parallel portions, gaps are formed that allow gear oil to be retained in the grooves through agency of surface tension of the gear oil when the cage is stationary relative to the inner ring.