1. A fixed type constant velocity universal joint, comprising:
an outer joint member including an inner surface provided with a track groove having a bottom surface being a circular arc surface;
an inner joint member including an outer surface provided with a track groove having a bottom surface being a circular arc surface;
a plurality of torque transmitting balls each arranged in a ball track formed of a pair of the track groove of the outer joint member and the track groove of the inner joint member; and
a cage interposed between the inner surface of the outer joint member and the outer surface of the inner joint member, for retaining the plurality of torque transmitting balls, wherein:
a curvature center of the track groove of the outer joint member and a curvature center of the track groove of the inner joint member have an offset of 0 in an axial direction;
the track groove of the outer joint member and the track groove of the inner joint member, which are tilted in opposite directions from each other with respect to an axis line, are alternately formed in a circumferential direction; and
the outer surface of the inner joint member is a spherical surface which is to be brought into sliding contact with an inner spherical surface of the cage, and the inner surface of the outer joint member is a cylindrical surface.
2. A fixed type constant velocity universal joint according to claim 1, wherein the inner surface of the outer joint member includes an opening portion having a tapered portion toward an opening side.
3. A fixed type constant velocity universal joint according to claim 1, wherein a number of the plurality of torque transmitting balls is selected among six, eight, and ten.
4. A fixed type constant velocity universal joint according to claim 1, wherein the curvature center of the track groove of the outer joint member and the curvature center of the track groove of the inner joint member are shifted from a joint center in a radial direction.
5. A fixed type constant velocity universal joint according to claim 2, wherein a number of the plurality of torque transmitting balls is selected among six, eight, and ten.
6. A fixed type constant velocity universal joint according to claim 2, wherein the curvature center of the track groove of the outer joint member and the curvature center of the track groove of the inner joint member are shifted from a joint center in a radial direction.
7. A fixed type constant velocity universal joint, comprising:
an outer joint member including an inner surface provided with a track groove having a bottom surface being a circular arc surface;
an inner joint member including an outer surface provided with a track groove having a bottom surface being a circular arc surface;
a plurality of torque transmitting balls each arranged in a ball track formed of a pair of the track groove of the outer joint member and the track groove of the inner joint member; and
a cage interposed between the inner surface of the outer joint member and the outer surface of the inner joint member, for retaining the plurality of torque transmitting balls, wherein:
a curvature center of the track groove of the outer joint member and a curvature center of the track groove of the inner joint member have an offset of 0 in an axial direction;
the track groove of the outer joint member and the track groove of the inner joint member, which are tilted in opposite directions from each other with respect to an axis line, are alternately formed in a circumferential direction; and
the outer surface of the inner joint member is a spherical surface which is to be brought into sliding contact with an inner spherical surface of the cage, and the inner surface of the outer joint member is a spherical surface which forms a gap together with an outer spherical surface of the cage.
8. A fixed type constant velocity universal joint according to claim 7, wherein a number of the plurality of torque transmitting balls is selected among six, eight, and ten.
9. A fixed type constant velocity universal joint according to claim 7, wherein the curvature center of the track groove of the outer joint member and the curvature center of the track groove of the inner joint member are shifted from a joint center in a radial direction.
10. A fixed type constant velocity universal joint, comprising:
an outer joint member including an inner surface provided with a track groove having a bottom surface being a circular arc surface;
an inner joint member including an outer surface provided with a track groove having a bottom surface being a circular arc surface;
a plurality of torque transmitting balls each arranged in a ball track formed of a pair of the track groove of the outer joint member and the track groove of the inner joint member; and
a cage interposed between the inner surface of the outer joint member and the outer surface of the inner joint member, for retaining the plurality of torque transmitting balls, wherein:
a curvature center of the track groove of the outer joint member and a curvature center of the track groove of the inner joint member have an offset of 0 in an axial direction;
the track groove of the outer joint member and the track groove of the inner joint member, which are tilted in opposite directions from each other with respect to an axis line, are alternately formed in a circumferential direction; and
the outer surface of the inner joint member is a spherical surface which is to be brought into sliding contact with an inner spherical surface of the cage, and the inner surface of the outer joint member is an elliptical surface which forms a gap together with an outer spherical surface of the cage.
11. A fixed type constant velocity universal joint according to claim 10, wherein a number of the plurality of torque transmitting balls is selected among six, eight, and ten.
12. A fixed type constant velocity universal joint according to claim 10, wherein the curvature center of the track groove of the outer joint member and the curvature center of the track groove of the inner joint member are shifted from a joint center in a radial direction.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A method for creating a horizontal lifeline between a pair of end anchorages, the method comprising:
providing a section of line having a modulus of elasticity;
providing an energy absorbing shock absorber having a deployment load;
connecting the section of line and the shock absorber to one another, between the end anchorages; and
tuning the section of line by pre-tensioning the section of line to a load that minimizes a sag angle in the line and is approximately equal to the deployment load.
2. A method according to claim 1 wherein said line is approximately 0.375 inch diameter cable and said load is between about 500 pounds and 2000 pounds.
3. A method for creating a horizontal lifeline between a pair of end anchorages, the method comprising:
providing a section of line having a modulus of elasticity;
providing an energy absorbing shock absorber having a deployment load;
connecting the section of line and the shock absorber in series between the end anchorages; and
tuning the section of line by tensioning the section of line to a load that is greater than a load required to suspend the section of line at a known sag angle after connecting the section of line and the shock absorber in series between the end anchorages.
4. A method according to claim 3 wherein said line is approximately 0.375 inch diameter cable and said load is between about 500 pounds and 2000 pounds.
5. A method for creating a horizontal lifeline between a pair of end anchorages, the method comprising:
providing a section of line having a modulus of elasticity;
providing an energy absorbing shock absorber having a deployment load;
connecting the section of line and the shock absorber in series between the end anchorages; and
tuning the section of line by tensioning the section of line to a load that essentially eliminates a sag angle in the line after connecting the section of line and the shock absorber in series between the end anchorages but is below the deployment load of the shock absorber.
6. A method according to claim 5 wherein said line is approximately 0.375 inch diameter cable and said load is between about 500 pounds and 2000 pounds.
7. A method according to claim 5 wherein said sag angle is less than approximately two degrees.