Toroidal-type continuously variable transmission component and method for evaluating the same
AssigneeNsk Ltd.
InventorsHiroshi Narai, Kikuaki Kamamura
Life of this patent
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Abstract
A toroidal-type continuously variable transmission component, such as an input disk, an output disk, an inner ring of a power roller bearing, and an outer ring of the power roller bearing, which is functioned as a rolling member, has a layer a depth of which is 0.5 mm or less from the surface thereof. The layer does not include a non-metallic inclusion having a maximum diameter of up to 0.1 mm in the area thereof having a depth of 0.5 mm or less from the surface thereof.
Claims12
A toroidal-type continuously variable transmission component comprising:
- a rolling member made of steel and having a layer formed at 0.4 mm or less from the surface thereof,
- wherein the layer does not contain non-metallic inclusion having the maximum diameter of 0.115 mm or more.
A toroidal-type continuously variable transmission component comprising:
- a rolling member made of steel and having a layer formed at 0.5 mm or less from the surface thereof,
- wherein the layer does not contain non-metallic inclusion having the maximum diameter of 0.1 mm or more.
A method for evaluating a toroidal-type continuously variable transmission component having a steel rolling member, said method comprising:
- disposing a desired surface of said rolling member to be measured and an ultrasonic detection probe within an ultrasonic wave transmissive medium;
- transmitting an ultrasonic wave, having a frequency in the range of 5 MHz-30 MHz, from said ultrasonic detection probe to said rolling member through said ultrasonic wave transmissive medium;
- and
- detecting and evaluating a non-metallic inclusion existing in the area of 0.5 mm or less from said desired surface of said rolling member in accordance with an ultrasonic echo reflected by said rolling member;
- disqualifying said rolling member when thus detected non-metallic inclusion has the maximum diameter of 0.1 mm or more.
Dependencies are inferred from the claim text.