Abstract: A temperature detecting material comprises a first material containing a first temperature indicating material and a second material containing a second temperature indicating material, wherein the first temperature indicating material and the second temperature indicating material contain a leuco dye, a color developing agent, and a decoloring agent, and have a hysteresis characteristic in their color density-temperature curves, wherein the first temperature indicating material has a color developing temperature in a temperature increase process lower than a decoloring temperature in the temperature increase process, and turns to a non-crystalline state and is kept in a decoloring state when cooled down below the color developing temperature in the temperature increase process with a predetermined cooling speed or more after melting, wherein the second temperature indicating material, a color developing temperature is lower than a decoloring temperature in the temperature increase process, and wherein the co

Abstract: A shaft seal arrangement of a turbocharger for an internal combustion engine having a throttle valve disposed upstream of a compressor of the turbocharger. The shaft seal arrangement is comprised of first and second seal rings fitted on a cylindrical thrust spacer mounted on a rotatable shaft on which turbine and compresser wheels are mounted. The first and second rings are located spaced from each other and positioned between the compressor and bearings for the rotatable shaft. An annular air chamber is formed between the first and second seal rings and supplied with atmospheric air through an air supply passage.

Abstract: A rolling bearing arrangement for a turbocharger is comprised of a bearing housing relative to which a rolling bearing is supported. The rolling bearing is securely provided with an outer sleeve which is disposed to surround the periphery of the rolling bearing. The rolling bearing is supported through the outer sleeve on the bearing housing. A first annular space is defined between the outer sleeve and the inner periphery of the bearing housing. An oil inlet opening is opened at the inner periphery of the bearing housing so that lubricating oil is supplied through the oil inlet opening to the first annular space. An oil film damper clearance is formed between the outer sleeve and the bearing housing inner periphery and located adjacent the first annular space in the axial direction of the outer sleeve so that the entire flow of lubricating oil supplied to the first annular space passes through the oil film damper clearance.

Abstract: A bearing supporting arrangement is provided for a turbocharger having a turbine shaft provided with turbine and compressor wheels. The bearing supporting arrangement includes first and second cylindrical oil film damper members, each of which is supported in a floating state through an oil film to the inner peripheral surface of a bearing housing thereby constituting an oil film damper. First and second annular ball bearings are coaxially fixedly supported respectively to the first and second oil film damper members. A generally cylindrical thrust receiving member is interposed between the first and second oil film damper members to be contactable with the first and second oil film damper members. The thrust receiving member is fixed at an axially intermediate portion to the bearing housing by a pin fixed to the bearing housing so as to be movable to make contact with the bearing housing. A first clearance (C.sub.

Abstract: In a supercharger, a pair of oil film dampers are installed by way of oil films on an inner circumferential wall of a bearing housing and respectively install thereon ball bearings for a rotor shaft. A hollow, generally cylindrical thrust member selectively abuts at the opposite axial ends upon the dampers, whereby to hold the oil film dampers, the ball bearings and therefore the rotor shaft in place relative to the bearing housing. The thrust member is fixed to the bearing housing by a pin received in a tangential groove of the thrust member, i.e., a groove elongated in parallel to a tangential line of a circular cross section of the thrust member.