Tapered Roller Bearing, a Tapered Roller Bearing Assembly and a Pinion-Shaft Supporting Assembly Using the Same
First Claim
1. A tapered roller bearing comprising:
- an outer ring;
an inner ring;
a plurality of tapered rollers interposed between these rings; and
a retainer for retaining the tapered rollers, wherein a roller loading ratio represented by z·
DW/(π
·
dm) is in a range of 0.7 to 0.92, and a ratio of roller length to roller diameter as represented by LWR/DW is in a range of 1.1 to 1.7, provided that z denotes a number of rollers, LWR denotes an effective length of the roller, DW denotes a mean diameter of the roller and dm denotes the Pitch Circle Diameter (PCD) of a roller, and wherein an outer-ring crowning parameter (=RCO/LRO) is in a range of 30 to 150, and an inner-ring crowning parameter (=RCI/LRI) is in a range of 50 to 260, provided that RCO denotes a radius of an outer-ring crowning, LRO denotes a raceway length of the outer ring, RCI denotes a radius of an inner-ring crowning, and LRI denotes a raceway length of the inner ring.
1 Assignment
0 Petitions
Accused Products
Abstract
A tapered roller bearing is designed to have a roller loading ratio in the range of 0.7 to 0.92 and a ratio of roller length to roller diameter in the range of 1.1 to 1.7 whereby oil agitation loss and rolling viscous resistance are reduced for achieving the reduction of running torque. Crownings are provided which are designed to have an outer-ring crowning parameter (=RCO/LRO) in the range of 30 to 150 and an inner-ring crowning parameter (=RCI/LRI) in the range of 50 to 260, provided that RCO denotes the radius of an outer ring crowning, LRO denotes the raceway length of an outer ring, RCI denotes the radius of an inner ring crowning and LRI denotes the raceway length of an inner ring. Thus, the rolling viscous resistance is reduced for achieving the reduction of running torque.
18 Citations
13 Claims
-
1. A tapered roller bearing comprising:
- an outer ring;
an inner ring;
a plurality of tapered rollers interposed between these rings; and
a retainer for retaining the tapered rollers, whereina roller loading ratio represented by z·
DW/(π
·
dm) is in a range of 0.7 to 0.92, and a ratio of roller length to roller diameter as represented by LWR/DW is in a range of 1.1 to 1.7, provided that z denotes a number of rollers, LWR denotes an effective length of the roller, DW denotes a mean diameter of the roller and dm denotes the Pitch Circle Diameter (PCD) of a roller, and whereinan outer-ring crowning parameter (=RCO/LRO) is in a range of 30 to 150, and an inner-ring crowning parameter (=RCI/LRI) is in a range of 50 to 260, provided that RCO denotes a radius of an outer-ring crowning, LRO denotes a raceway length of the outer ring, RCI denotes a radius of an inner-ring crowning, and LRI denotes a raceway length of the inner ring. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
- an outer ring;
-
2. A tapered roller bearing comprising:
- an outer ring;
an inner ring;
a plurality of tapered rollers interposed between these rings; and
a retainer for retaining the tapered rollers, whereina roller loading ratio represented by z·
DW/(π
·
dm) is in a range of 0.7 to 0.92, and a ratio of roller length to roller diameter as represented by LWR/DW is in a range of 1.1 to 1.7, provided that z denotes a number of rollers, LWR denotes an effective length of the roller, DW denotes a mean diameter of the roller, and dm denotes a Pitch Circle Diameter (PCD) of the roller, and whereinraceways of the outer ring and the inner ring and a rolling contact surface of the tapered roller are each provided with a crowning;
a total crowning amount (=an outer-ring crowning amount+an inner-ring crowning amount+a roller crowning amount) is 50 μ
m or more;
an outer-ring crowning rate (=the outer-ring crowning amount/the total crowning amount) is 40% or more; and
a roller crowning rate (=(the roller crowning amount×
2)/the total crowning amount) is 20% or less. - View Dependent Claims (10, 11, 12, 13)
- an outer ring;
Specification