Denso Corporation

Nippondenso Co., Ltd.

Sotoo Takahashi

Matsuo Fukaya

Masamichi Shibata

Tsunenobu Hori

Kaoru Kuzuoka

Yuusuke Toudou

Junichi Nagai

Susumu Shibayama

The temperature sensor includes a thermo-sensitive element, first and second electrode wires electrically connected to the thermo-sensitive element, first and second signal wires partially overlapped with and connected to the first and second electrode wires, respectively. The first and second electrode wires are made of a first metal material consisting primarily of Pt. The first and second signal wires are made of a second metal material containing Al and having a linear thermal expansion coefficient larger than that of the first metal material. Each of an overlap portion of the first electrode wire and the first signal wire and an overlap portion of the second electrode wire and the second signal wire includes a junction part formed by melting and thereafter coagulating the first or second electrode wire and the first or second signal wire. The junction part includes an oxidation film containing Al formed on a surface thereof.

Temperature sensor

A temperature sensor has a thermistor element equipped with a pair of electrodes, a sheath pin into which a pair of signal lines is built, and a cover surrounding the thermistor element. A front part of each signal line is exposed from the sheath pin. The cover is placed at a front part of the temperature sensor. The cover has a contact positioning part with which the front part of the sheath pin is contacted. Cement is filled into a space between the cover and the thermistor element in front of the front part of the contact positioning part. Through the cement, the thermistor element is supported by and fixed to the cover. A front inside space formed in front of the front part of sheath pin and a peripheral inside space formed in a rear side of the front part of the sheath pin are formed between the front part of the sheath pin and the inside surface of the cover.

Thermistor-type temperature sensor

In a temperature sensor inserted into a hole formed in a wall of an exhaust gas passage thereby to set a temperature sensitive element in position in the passage, a metal rib in close contact with a hole for preventing the leakage of the exhaust gas is welded over the entire outer peripheral surface of a metal outer cylinder at the end thereof nearer to the passage, and a cylindrical metal sleeve for covering lead wire connecting portions is welded over the entire periphery of a protrusion of the rib at a position further away from the passage than the coupling portion between the rib and the outer cylinder.

A novel temperature sensor having a radial-type thermistor and a method of fabrication thereof are disclosed. A pair of electrode wires,are embedded in a spaced relation from each other substantially in parallel to the axis,of a cylindrical thermistor,, and have an end,thereof led out toward an end,of the cylinder of the thermistor,. A pair of core wires (signal lines),arranged in spaced relation from each other substantially in parallel to the cylinder axis,are led out from the outer cylinder,of a two-core pipe,and are connected to an end,of each electrode wire,. The wires,are overlapped in such a manner that the diagonal K,connecting the electrode wires,crosses the diagonal K,connecting the signal lines,on the cylinder axis,, and coupled to each other by laser welding. In this way, the rod-like electrode wire pair led out of the thermistor in the same direction is connected to the signal line pair, thus securing the coupling reliability between the electrode wires and the signal lines while at the same time reducing the size of the temperature detecting portion.

Temperature sensor and method of manufacturing thereof

A thermistor type temperature sensor having a substrate made from an electrically insulating ceramic plate. A thin or thick film detecting resistor is printed on the substratum. A thick or thin film pull-up resistor may also be printed on the substratum, and trimming of the resistors is possible. The ratio of B-constant values for the detecting resistor and the pull-up resistor may be selected so that it is locate between 0.4 to 0.9 or 1.1 to 1.5. The detecting resistor may be constructed from thermistor sections of the same composition and the sections may be connected in parallel or in series. The thermistor sensor can be connected to the pipe through which a gas passes. When the sensor is connected to the pipe, the angle of the measuring plane may be adjusted, so that a precise measurement can be obtained.

Growing community of inventors

Okazaki, Japan

Sotoo Takahashi