US 11,077,709 B2 · Drive shaft and method for producing drive shaft

Abstract

A drive shaft is configured by joining solid stub shafts formed of a medium carbon steel to both ends of a hollow tubular body formed of a medium carbon steel. When expressed as grain size number, the grain size of the hollow tubular body at joint parts where the hollow tubular body and the solid stub shafts are joined together ranges from #5 to #9, and the grain size of the solid stub shafts at the joint parts ranges from #10 to #12.

Claims10

Dependent claims

A drive shaft comprising:

a hollow tubular body formed of a medium carbon steel;
and
solid stub shafts formed of a medium carbon steel and joined to both ends of the hollow tubular body,
wherein, when grain size is expressed as grain size number, grain size of the hollow tubular body at joint parts where the hollow tubular body and the solid stub shafts are joined together ranges from #5 to #9, and grain size of the solid stub shafts at the joint parts ranges from #10 to #12.

1 more element

A production method for obtaining a drive shaft by joining solid stub shafts formed of a medium carbon steel to both ends of a hollow tubular body formed of a medium carbon steel, the production method comprising:

obtaining the solid stub shafts by cold forging;
and
joining the hollow tubular body and the solid stub shafts together by friction welding, and setting, when grain size is expressed as grain size number, grain size of the hollow tubular body at joint parts where the hollow tubular body and the solid stub shafts are joined together to range from #5 to #9 and setting grain size of the solid stub shafts at the joint parts to range from #10 to #12.

Dependencies are inferred from the claim text.

Facts

Application

16/827,749Filed 24 Mar 2020

Priority

JP JP2019-06426728 Mar 2019

Published

US 2020/0307312 A11 Oct 2020

Granted

3 Aug 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

B60B 35/12
Axle units; Parts thereof ; Arrangements for lubrication of axles: torque-transmitting axles
B23K 20/12
Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating: the heat being…
B23K 20/129
The heat being generated by friction; Friction welding: specially adapted for particular articles or work
B60B 35/14
Torque-transmitting axles: composite or split, e.g. half- axles; Couplings between axle parts or sections

Drive shaft and method for producing drive shaft

Life of this patent

Drive shaft and method for producing drive shaft

Life of this patent

Abstract

Claims10