A device and a system for measuring temperature in an inaccessible and/or movable mechanical part. The device comprises a temperature-sensitive element which can be installed inside the movable part and which is designed to emit a signal containing information on the temperature of said element, in such a way that this signal can be received by a control unit. The temperature-sensitive element is a SAW chip which is arranged at the lower end of a hole in the mechanical part whose temperature is to be measured and it is connected to a first antenna provided outside said hole in said mechanical part.

Device and system for monitoring internal temperature of inaccessible or moving parts

A temperature measurement device is provided with a temperature sensing element which contains a quartz resonator having a quartz oscillating crystal whose ratio of width to thickness is in the range of 9.48 to 9.69, and an antenna which receives stimulus for the quartz oscillating crystal and transmits waves of reverberatory oscillation. The temperature measurement device is capable of measuring temperatures in the range of normal room temperature to extremely low temperatures (4° K.).

Temperature measurement device

A method is described for monitoring slide bearings ( 10, 6, 9 ), especially of a piston engine, with a forced feed lubrication ( 12 ) comprising a forced-oil line ( 16 ) and branch lines ( 17 ) branching off from the forced-oil line ( 16 ) for the supply with oil of at least one slide bearing ( 10, 6, 9 ), with an operating parameter which changes on the occurrence of bearing damage being repeatedly measured and evaluated. In order to provide advantageous process conditions it is proposed that the rates of oil flow and/or the oil pressures in the branch lines ( 17 ) are measured and temporal changes to said operating parameters are evaluated for monitoring the bearing.

Method for monitoring slide bearings, especially of a piston engine

A method for monitoring slide bearings ( 8, 10, 11 ) of a crank mechanism ( 12 ) of a piston engine is described, comprising at least one cylinder ( 1 ) whose piston ( 2 ) is drivably connected with a crankshaft ( 4 ) via a connecting rod ( 5 ) which is loaded alternatingly under tension and under pressure by the piston ( 2 ) in the zone of a dead center of the crank mechanism ( 12 ) depending on the cycle of the piston engine, with an operating parameter which changes on the occurrence of bearing damage being repeatedly measured and evaluated. In order to provide advantageous conditions for the method it is proposed that the piston position is measured at the dead center of the crank mechanism ( 12 ) under pressure load of the connecting rod ( 5 ) on the one hand and under tensile load of the connecting rod ( 5 ) on the other hand and the difference between the piston positions for the tensile and pressure load is evaluated.

Method for monitoring slide bearings of a crank mechanism of a piston engine with at least one cylinder

PURPOSE:To make it possible to perform accurate, stable temperature measurement for a long period, by using a temperature sensor comprising a piezoelectric element, and arresting the resonant reverberation signal of the sensor. CONSTITUTION:An intermittent detected signal A, whose frequency is changed from f1-fn stepwise, is transmitted to a temperature sensor 1 through an electromagnetic coupling part 4 from a transmitting part 2 in a transmitting mode. Then the temperature sensor 1 is resonated at a constant frequency. When the detected signal becomes an OFF state, the mode is changed into a receiving mode by the operation of a mode switching part 11. At the same time, the resonance of the temperature sensor 1 is stopped. However a gradually attenuating reverberation signal B remains. Therefore, the signal B is received with a receiving part 3 through the electromagnetic coupling part 4. Since the resonance frequency of the temperature sensor 1 is changed with temperature, the temperature of a charged body can be found based on the frequency of the received reverberation signal B. Thus, the accurate, stable measurement of the temperature can be performed for a long period.

Temperature measuring apparatus of charged body

PURPOSE:To accurately measure temperature of a bearing by scanning an exciting signal having a frequency coincident to each of inherent frequencies of a piezoelectric element which arbitrarily selects a measurement range of temperature and sending an echo signal from the resonance circuit of a sensor which is disposed adjacent to the bearing CONSTITUTION:A sensor 15 is embedded in the bearing housing part 14 of a connecting rod 10 The terminal point of the sensor 15 is adjacent to a bearing 11 The body 17 of the sensor 15 has a piezoelectric element 18 engaged at the tip end thereof and has a receiving antenna 19 at the opposed based end thereof Both the element 18 and the antenna 19 are connected by a lead wire 20, which has a tunning element 21 on the way thereof A resonance circuit 22 is thus made up A transmitter antenna 23 is disposed along the internal face of a crankcase 13, which is connected to a transceiver 24 and a warning device 25 in order An exciting signal having a frequency corresponding to each of temperature values which are arbitrarily selected within a range of measured values is sent from the transceiver 24 to the resonance circuit 22 via the transceiver antenna 23

Shibuya Yukichi

Papers

Bearing temperature monitoring device