Hitachi Metals, Ltd.

Hino Motors, Ltd.

Takashi Hattori

Mitsuru Yano

Kenji Itoh

Masatoshi Nakamizo

Hisashi Yasuda

Koki Otsuka

Susumu Katsuragi

Seiichi Endo

Masanori Hara

Tadao Otsuka

An integrally cast steel piston for internal engines, the cast steel having (a) a composition comprising 0.8% or less of C, 3% or less of Si, 3% or less of Mn,0.2% or less of S, 3% or less of Ni, 6% or less of Cr, 6% or less of Cu, and 0.01-3% of Nb, the balance being substantially Fe and inevitable impurities, or (b) a composition comprising 0.1-0.8% of C, 3% or less of Si, 3% or less of Mn, 0.2% or less of S, 10% or less of Ni, 30% or less of Cr, 6 % or less of Cu, and 0.05-8% of Nb, the balance being substantially Fe and inevitable impurities, by mass.

Internal engine piston and its production method

A method of manufacturing a heat resistant member includes the step of designing the shape of the heat resistant member, including the substeps of estimating thermal stress of the heat resistant member by heating a model formed by a high-thermal expansion material which has a similar shape to the desired shape of the heat resistant member while the model is restrained and also while it is free. The high-thermal expansion material is different from the material of the member being modeled and has a thermal expansion coefficient greater than that of the material of the member being modeled. Additionally, the step of designing includes the substeps of measuring the strain of the model at each of a plurality of predetermined positions while the model is heated by strain gauges adhered to predetermined positions on the model, and calculating the stress at each predetermined position from the difference in measured strain values between the restraint state and the free state. Finally, the manufacturing method includes casting the heat resistant member to the designed shape.

Method of manufacturing a product by estimating thermal stress using a

A method of estimating a thermal stress of a heat-resistant member, part or the whole of which is to be heated to a high temperature, comprising heating a model formed by a high-thermal expansion material and having a shape similar to that of the heat-resistant member; and measuring a thermal strain of the model at each of predetermined positions by strain gauges adhered thereto.

Method of estimating the thermal stress of a heat-resistant member by

A coupler for connecting a trailer to a tractor includes a main plate having a top surface and a bottom surface and formed with an oil groove on the top surface for a lubricant to flow therethrough, a pair of king pin locking jaws secured to the bottom surface of the main plate for pivotal movement in a horizontal plane to cooperate with each other to releasably hold a king pin therebetween, and a locking member located on the bottom surface of the main plate for sliding movement in which it is brought into and out of engagement with the jaws, to be inserted in a space defined by heads of the jaws when the king pin is held between the jaws to keep the jaws from pivotally moving. The locking member is formed with an oil sump located on a top surface thereof, and oil passages extending from the oil sump to an outer periphery of the locking member, and the main plate is formed with a through hole extending from a position in which it communicates with the oil groove on the top surface of the main plate to the oil sump on the top surface of the locking member.

Coupler for connecting trailer to tractor

Growing community of inventors

Kanda, Japan

Takashi Hattori