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US 8,939,844 B2Granted
Shell-type needle bearing and cross-type universal joint
AssigneeNsk Ltd.
InventorsMasato Higuchi, Eisho Watanabe
Life of this patent
Estimating the term…
Abstract
Cross-type universal joint and a shell-type needle bearing that is used therein. The portions on the outer surface of the shell-type outer ring for which there is a possibility of coming in sliding contact with the tip end edges of at least two seal lips of a plurality of seal lips of a seal ring are selectively covered with a corrosion resistant coating. Preferably, the entire outer surface of the shell-type outer ring is covered by a chemically treated film having anti-corrosion properties.
Claims17
A shell-type needle bearing, comprising:
- a shell-type outer ring that is formed by bending a metal plate and comprises a cylindrical section, a bottom plate section that covers the entire one end side in the axial direction of the cylindrical section, and an inward-facing collar section that is bent inward in the radial direction from the other end side in the axial direction of the cylindrical section, this shell-type outer ring during use being fastened inside a circular hole that is formed in an outside member;
- and
- a plurality of needles that are provided on the inner-diameter side of the shell-type outer ring so as to be able to roll freely;
- wherein a portion near the other end in the axial direction of the outer surface of the shell-type outer ring, where there is a possibility that a tip end edge of a seal lip of a seal ring that is fitted around and fastened to the outer circumferential surface of a shaft section that is inserted into the inner-diameter side of the needles will come in sliding contact, is covered by a corrosion resistant coating.
1 more element
A cross-type universal joint, comprising:
- a pair of yokes each formed in a forked shape and including a pair of arm sections, and circular holes that are formed in tip end sections of the arm sections so as to be coaxial with each other;
- a joint cross that comprises a connection base section, and four shaft sections that are fastened to an outer surface of the connection base section in a radial manner, the joint cross being combined with the pair of yokes with the shaft sections inserted inside the circular holes respectively;
- four shell-type needle bearings that are provided between outer circumferential surfaces of the shaft sections and inner circumferential surfaces of the circular holes;
- and
- four seal rings;
- wherein each of the four shell-type needle bearings comprises:
- a shell-type outer ring that is formed by bending a metal plate and comprises a cylindrical section, a bottom plate section that covers the entire one end side in the axial direction of the cylindrical section, and an inward-facing collar section that is bent inward in the radial direction from the other end side in the axial direction of the cylindrical section, this shell-type outer ring during use being fastened inside a circular hole that is formed in an outside member;
- and
- a plurality of needles that are provided on the inner-diameter side of the shell-type outer ring so as to be able to roll freely;
- and
- at least part of a portion of the outer surface of the shell-type outer ring that is separated from the circular hole is covered by a corrosion resistant coating, and
- wherein each of the four seal rings has:
- a base section that is fastened around and supported by a base end section of a corresponding one of the shaft sections;
- and
- a radial seal lip and a thrust seal lip that are provided between the base end section of the corresponding shaft section and an opening section of the corresponding shell-type outer ring, the radial seal lip coming in sliding contact with and all around an external circumferential surface of an axial end section of the shell-type outer ring that protrudes from the corresponding circular hole, and the thrust seal lip coming in sliding contact with and all around an external surface of an inward-facing collar section of the shell-type outer ring;
- wherein the external circumferential surface of the axial end section and the external surface of the inward-facing collar section of each shell-type outer ring are continuously covered with a corrosion resistant coating.
13 more elements
A cross-type universal joint, comprising:
- a pair of yokes each formed in a forked shape and including a pair of arm sections, and circular holes that are formed in tip end sections of the arm sections so as to be coaxial with each other;
- a joint cross that comprises a connection base section, and four shaft sections that are fastened to an outer surface of the connection base section in a radial manner, the joint cross being combined with the pair of yokes with the shaft sections inserted inside the circular holes respectively;
- four shell-type needle bearings that are provided between outer circumferential surfaces of the shaft sections and inner circumferential surfaces of the circular holes;
- and
- four seal rings;
- wherein each of the four shell-type needle bearings comprises:
- a shell-type outer ring that is formed by bending a metal plate and comprises a cylindrical section, a bottom plate section that covers the entire one end side in the axial direction of the cylindrical section, and an inward-facing collar section that is bent inward in the radial direction from the other end side in the axial direction of the cylindrical section, this shell-type outer ring during use being fastened inside a circular hole that is formed in an outside member;
- and
- a plurality of needles that are provided on the inner-diameter side of the shell-type outer ring so as to be able to roll freely;
- and
- at least part of a portion of the outer surface of the shell-type outer ring that is separated from the circular hole is covered by a corrosion resistant coating, and
- wherein each of the four seal rings has:
- a base section that is fastened around and supported by a base end section of a corresponding one of the shaft sections;
- and
- seal lips that are provided between the base end section of the corresponding shaft section and an opening section of the corresponding shell-type outer ring, each of the seal lips having a tip end edge that comes in sliding contact with and all around an external surface of an axial end portion of the corresponding shell-type outer ring that protrudes from an inside surface of the corresponding arm section;
- wherein a portion of the external surface of the protruding axial end portion of each shell-type outer ring that comes in sliding contact with the tip end edges of at least two of the seal lips, other than a seal lip that is furthest on the outside of the seal lips, is covered with the corrosion resistant coating.
13 more elements
Dependencies are inferred from the claim text.