NIPPON THERMOSTAT CO., LTD.

A thermostat device is configured for installation at a branch point between a main passage and a bypass passage includes a thermostat, a differential pressure valve, and a coupling structure that mechanically connects the thermostat and the differential pressure valve. The thermostat includes a valve seat member, a valve body movable relative to the valve seat member, and a thermo-element having a temperature-responsive material that actuates the valve body to control flow through the main passage. The differential pressure valve includes a valve seat member and a valve body movable to control flow through the bypass passage. The coupling structure includes a holder supporting the differential pressure valve, a flange projecting from the holder, and a biasing member that maintains engagement between the flange and a frame of the thermostat while permitting dimensional tolerance between the coupled components.

A circulating circuit member 1 forms a part of a circulating circuit through which a fluid flows. The circulating circuit member 1 includes a pipe 4; a to-be attached member that has a sleeve portion 3 made of synthetic resin to which the pipe 4 is rotationally connected; and a pin 6 that is inserted from the sleeve portion 3 to the pipe 4, in which a pin insertion hole 5 of the sleeve portion 3 through which the pin 6 is inserted is formed by a mold that is pulled out from an inside of the sleeve portion 3.

In a water outlet, the deterioration of sealing performance is prevented by a sealing member sealing between a pipe and the connecting port of the water outlet. A water outlet is provided at a coolant outlet of an internal combustion engine to which a pipe leading coolant out of the engine is connected, having a dish-shaped body fixed to the engine, a cylindrical connecting port provided to rise outward from the body portion and to be inserted into the inside of the pipe, and a sealing member on the outer circumference of the connecting port. A convex portion is provided on the outer circumferential side of the connecting port to rise outward from the body, and an annular sealing member is provided between the connecting port and the pipe, and at least a circumferential portion of the pipe is disposed between the convex portion and the connecting port.

Provided is a water outlet that guides a coolant so as to be distributed to various devices, wherein a reduction in the sealing properties of a sealing member, which seals the space between a pipe and a connecting port of the water outlet to which the pipe is connected, is prevented. Specifically provided is a water outlet 100 that is provided to a coolant outlet of an internal combustion engine 20 and that has connected thereto a pipe 32 for guiding a coolant out from the internal combustion engine, the water outlet comprising a plate-shaped body 1 which is fixed to the internal combustion engine, a cylindrical connecting port 3 which is provided so as to stand up from the body toward the outside and which is inserted inside of the pipe, and a projection 9 which is provided so as to stand up from the body toward the outside at the outer peripheral side of the connecting port, wherein an annular sealing member 11 is provided between the connecting port and the pipe and at least part of the pipe in the circumferential direction is positioned between the projection and the connecting port.

To prevent a gasket fitted into a groove of a housing of a thermostat device from coming off and the leakage of coolant. A cover member detachably attached to a thermostat device includes a housing that has a body having an opening at one end and a groove surrounding the opening and a pair of legs standing inside the groove from one end of the body, and a gasket to be fitted into the groove. The cover member has a dish-shaped portion that has an insertion hole through which the pair of legs is inserted and covers the gasket, and a cylindrical portion erecting from the opening edge of the insertion hole and into which the pair of legs are press-fitted inside, and a corrugated section is formed in the portion of the cylindrical portion opposite to the legs.

A thermostat device is provided that smoothens the flow of the coolant to keep the pressure loss small and can sufficiently secure the flow rate of the coolant from the radiator side to the engine side. A housing having a first inlet for introducing a coolant cooled by a radiator and a coolant outlet supplied to the internal combustion engine, a thermo-element accommodated in the housing that moves axially depending on the temperature of the coolant, a control valve that controls the amount of coolant introduced from the first inlet as the thermoelement moves in the axial direction, and a slope having an upward slope from the outlet side to the valve seat side inside the exit-side conduit extending from the valve seat in the housing, wherein the control valve is in contact with in the valve-closed state, toward the flow outlet of the coolant, are provided.

Provided are a thermostat device and a method for manufacturing the same, capable of minimizing an increase in size of the thermostat device, and where a seal member is easily assembled and cost can be minimized. This thermostat device includes a housing, attached to a mounting hole of a counterpart member, that has a flow path for a coolant formed therein, a seal member that creates a liquid-tight seal between the counterpart member and the housing, a thermo-element that expands and contracts in accordance with the coolant temperature, a valve body that opens and closes the flow path due to the expansion and contraction of the thermo-element, and a coil spring that biases the valve body in a closing direction, the housing having formed therein a deformed annular groove into which the seal member fits, and the seal member having a perfectly circular shape in a natural length state.

A temperature adjustment device is capable of suppressing sleeve enlargement and preventing the rattling thereof with a synthetic resin housing. Flanges are formed on the temperature adjustment member. The sleeve has a groove along the circumferential direction on its outer periphery and a lateral hole opening at one end to the groove and penetrating through the wall thickness of the sleeve. A clip member has an outer fitting portion, elastically deformable and fittable to the groove and has an inward convex portion holding the flange from the distal-end side of the sleeve, by being inserted in the lateral hole. The groove wall has a groove-depth wall at the deepest portion opposite to the groove opening and a distal-proximal-end-side curved portion of the groove-depth wall connected to the distal-proximal-end side of the sleeve. The radius of curvature of the distal-end-side curved portion is larger than that of the proximal-end-side curved portion.

The thermostat device includes a housing having a valve seat formed thereinside, a thermo-element having one end inserted inside the housing, a valve body seated on or separated from the valve seat by the extension/contraction of the thermo-element, a coil spring biasing the valve body toward the valve seat, and a frame supporting one end of the coil spring. The housing has a hollow body part opening at one end, paired legs erecting from the opening edge of the body part, on whose leading ends the frame is hooked, and ribs provided at the opening edge and contiguous to each root side of the legs. The outer surface of each leg is arc-shaped, and the outer surface of each rib is curved or inclined to extend from the outer surface of the corresponding leg toward the inner side of a circle connecting the outer surfaces of the pair of legs.

In a fuel cell cooling device, sliding damage to a piston and the deterioration of sealing performance are prevented despite using a simple structure in which a portion sliding with the piston is made of a brass bushing and a simple and inexpensive method of setting the assembly of the brass bushing to a press-fitted state by light press-fitting and ball burnishing. Provided is a stainless steel cylindrical guide slidably retaining a stainless steel piston, advancing and retracting according to the expansion and contraction of the thermal expansion body, provided at the open end of a bottomed cylindrical case containing a thermal expansion body. A brass bushing is fitted into the inner circumferential portion of the cylindrical guide by light press-fitting and subjected to precision finishing on the inner circumferential surface, for example, by ball burnishing, to be expanded radially by the pressure from the inside and press-fitted.