Nippon Thermostat Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Otsuka Pharmaceutical Factory, Inc.

Fujio Inoue

Hiroyasu Koyama

Tetsuji Watanabe

Tetsuya Nishimura

Daisuke Tsukamoto

Koichi Takeda

Osamu Takiguchi

Katsuyoshi Hamai

Masaki Nishioka

Tetsuya Masuda

A thermostat device provided with a cylindrical boss protruding into a flow of fluid flowing in from a fluid inlet inside a device housing from a direction obstructing the flow of fluid, wherein a rectifying wall in the shape of a thin plate that protrudes toward an upstream side of the flow of fluid from the boss is provided as a rectifying means. The rectifying wall is formed in the shape of a plate that gradually increases in thickness from the fluid inlet side toward the boss. The leading edge along a direction of the flow of fluid is formed to have a tapered shape inclined from the tip of the boss toward the base of the boss. A side of the boss opposite the side facing the fluid inlet is provided with a rib.

Thermostat device

A coolant passage deviceincludes coolant intake pipesandthat take in coolant from an engine, a delivery pipeto a radiator communicating with the coolant intake pipes, and a delivery pipeto the heater core branched from a central passageconnecting the coolant intake pipes with the delivery pipe to the radiator. A branch portleading to the delivery pipeto the heater core is opened in an upper portion in the central passagein a state where the coolant passage deviceis mounted to the engine, and the branch porthas a wall surfacesurrounding the branch port and hanging down into the central passage. The wall surfaceprevents bubbles contained in the coolant from entering the branch port. And the coolant passage device consequently prevents coolant flow noise from occurring.

Coolant passage device for internal combustion engine

A pair of coolant receiving pipes () and () for respectively receiving a coolant from left and right engine heads of a V-engine are provided on a first body () side, and a collecting passage () for collecting the coolant, communication opening () towards a radiator via the above-mentioned collecting passage () and communication opening () towards a branch passage provided with a heater core part or the like are provided on a second body () side and these are individually resin molded. A coolant passage apparatus () is formed by joining the above-mentioned first body () and second body () for example by welding means.

Coolant passage apparatus for internal combustion engine

A cooling apparatus for an internal combustion engine is provided in which a temperature detecting tip of a temperature sensor is arranged in a position where flow of a coolant is smooth, to thereby improve a measurement accuracy of coolant temperature. A thermoelement assemblyand the temperature sensorwhich detects the temperature of the coolant are accommodated in the housingarranged at a return channel of the coolant which flows from a radiator to a coolant inflow part of the engine. The temperature detecting tipof the temperature sensoris arranged to face the inside of a circulation holeof the housingbetween a valve bodywhich constitutes the thermoelement assembly and a frame support part formed in the circulation holeof the housing

Cooling apparatus for internal combustion engine

A coolant passage apparatusis formed by joining a plurality of resin moldingsandwhich are each individually molded. A pair of coolant receiving pipesandfor respectively receiving a coolant from a pair of engine heads and riser pipesandadjoining the coolant receiving pipes are provided, a central passageis formed between the riser pipes, and a communicating tubewhich is towards a radiator is formed to communicate with the central passage. Assuming that a line passing through the center of the central passageis (indicated by) A and lines passing through the centers of the above-mentioned riser pipes are (indicated by) B respectively, each of the lines B is outwardly and obtusely angled with respect to the line A, and the riser pipes are respectively molded on both sides of the central passage to incline outwardly.

A thermostat device includes a valve housing with a cooling water passage of an internal combustion engine, a built-in thermally expansive body thermally expanded or contracted by temperature change of cooling water, a piston rod slid by thermal expansion/contraction of the expansive body, and a valve body subjected to opening/closing operation by the piston rod in accordance with volume change of the expansive body. A valve seat shape on downstream side than the valve seat, which is an internal wall face forming the passage is formed in a shape that in valve open condition the cross-sectional area of the passage between an inlet seal of the valve seat and the top face of the valve body gradually decreases with reference to the maximum passage cross-sectional area on upstream side and that the cross-sectional area of the passage at the face perpendicular to the top face gradually increases.

The object of the present invention is to obtain a thermostat device capable of improving the workability and assemblability, reducing costs, and downsizing the entire device with a minimum number of components. This thermostat device has a first valve discfor opening and closing a first fluid passage, and a second valve discfor opening and closing a second fluid passage, and constituted so as to open either the first fluid channel or second fluid channel and close the other by making the valve discs move integrally in conjunction with the operation of an operating memberin accordance with the temperature change of the fluid. The operating member has a casewhich seals in one end side thereof a thermal expansion bodyhaving a property of expanding and contracting in accordance with a temperature change, and retains a pistonfrom the opening of the other end side thereof in a freely reciprocable manner. The outward flange unitprovided to the opening on the other end side of the case is made to be the first valve disc.

Thermostat

A thermal element of a simple structure which can have a reduced cost because a minimum required number of structural components are used, excels in response and endurance and enables forward and backward movement of a piston with the prescribed stroke under the effect of volume changes following the expansion and contraction of a thermally expandable body. A thermal elementcontaining a thermally expandable body (wax) inside a casecomprises a pistonarranged inside the case along the axial line thereof. The inward end of the piston borders on the inside of the thermally expandable body and the outward end thereof protrudes outwardly from one end of the case, thereby enabling the piston to move forward and backward following the expansion and contraction of the thermally expandable body. The piston is slidably held with a guide memberdisposed in a portion at one end inside the case. Furthermore, a sealing memberis disposed in a portion at the inward end of the guide member inside the case and seals the thermally expandable body at the other end inside the case.

Growing community of inventors

Kiyose, Japan

Fujio Inoue