JPS6349373Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is particularly applicable to a synthetic resin jacket which is connected to the water jacket of an engine of a cab-over type automobile, etc., and is used to supply and fill the upper part of the water jacket with cooling water. This concerns the header tank.

Conventional technology Conventionally, in cab-over type automobiles, because the cab is installed above the engine, there are restrictions on where the engine can be installed, and the upper end of the radiator is positioned below the upper end of the engine's water jacket. In this case, the upper part of the water jacket will not be filled with cooling water.

In order to raise the boiling temperature of the cooling water, the header tank is configured to generate a maximum pressure of 0.5 kg/cm ² above atmospheric pressure, and therefore the cooling water temperature in the header tank is at a maximum of 100℃~ 105℃
reach.

The conventionally known synthetic resin header tank has a first
As shown in the figure, an inlet portion 3 of a synthetic resin connecting pipe 2 that is integrally formed and protrudes from the outside of the tank body 1.
As shown in FIG.
The engaging piece 6 of the cap 4 is crimped to the lower surface of the locking collar 5 of the inlet part 3 to hold it in the fitted position. 7 was crimped with a spring, and the injection port 3 of the connecting pipe 2 was sealed by the valve 7.

In addition, a synthetic resin liquid container for use in power agricultural machinery, etc., which is integrally formed with a continuous member protruding from the synthetic resin liquid container and has a built-in metal fitting attached to the end of the continuous member, was developed in 1987-47707. It has been proposed as a publication number.

Problems to be Solved by the Invention However, in the conventionally known header tank made of synthetic resin, the cap 4 attached to the end of the inlet part 3
receives the reaction force of the spring that presses the valve 7 against the valve seat inside the inlet part 3, and an external force in the direction of arrow a in FIG. As it is acted by the coupling piece 6 and receives the pressure and temperature of the cooling water inside the tank body, the locking collar 5 of the inlet part 3 is deformed, the holding pressure of the tank body 1 is reduced, and the inlet part 3 is This has the disadvantage that the pressure holding ability of the inlet is deteriorated, and in some cases, the locking collar 5 of the injection port 3 may be damaged.

In addition, the one described in Japanese Utility Model Application Publication No. 48-47707 is
The embedded metal fittings are made to protrude from the bottom wall of the liquid container, and the peripheral wall of the embedded metal fittings is covered below the bottom wall, and the peripheral wall and upper end of the embedded metal fittings are covered above the bottom wall with a member that continues from the bottom wall, thereby improving the airtightness of the adhesive joint between the liquid container and the embedded metal fittings.However, since the embedded metal fittings must be embedded in the bottom wall of the liquid container, attaching the embedded metal fittings to the liquid container was troublesome.

The purpose of the present invention is to address the above-mentioned problems and to
The cap is made of metal, and even if the pressure and temperature of the cooling water in the tank body acts on the cap, the locking collar of the cap will not be deformed or damaged, so there will be no reduction in the holding pressure of the tank body. Since the valve seat of the connecting tube engages with the annular step of the cap, the connection of the cap to the connecting tube is extremely strong, and the fitting of the connecting tube is prevented. After fitting the small-diameter cylindrical part of the cap into the large-diameter cylindrical part of the cap, a locking collar is formed on the end of the fitting part of the continuous pipe located inside the large-diameter cylindrical part of the cap. An object of the present invention is to provide a header tank made of synthetic resin in which mounting of a valve seat and formation of a valve seat can be performed at the same time.

Means for Solving the Problems The synthetic resin header tank of the present invention is a synthetic resin header tank in which a synthetic resin connecting pipe 12 is integrally formed so as to protrude outside the tank body, and the outer periphery of the connecting pipe 12 is located near the end. Fitting the small diameter cylindrical part 13 of the metal cap 11 into the fitting part formed in the
An annular stepped portion 15 is provided in the small diameter cylindrical portion 13 of the cap 11.
A large-diameter cylindrical portion 14 is provided coaxially with the small-diameter cylindrical portion 13 via a locking collar 16 is formed on the outer periphery of the end of the large-diameter cylindrical portion 14, and a locking collar 16 is formed on the outer periphery of the end of the large-diameter cylindrical portion 14. It has a structure characterized in that a valve seat 21 that engages with the annular stepped portion 15 of the mouthpiece 11 is formed in the portion thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail

In FIG. 3, reference numeral 12 denotes a synthetic resin connecting pipe that projects outside the tank body and is integrally formed.A metal cap 11 is fixed to the end of the connecting pipe 12, and the end of the cap 11 has a metal cap 17
is attached removably.

A fitting portion having an outer diameter smaller than the outer diameter of the connecting tube 12 is formed on the outer periphery of the connecting tube 12 that is integrally formed with the tank body, and the fitting portion has an outer diameter smaller than the outer diameter of the connecting tube 12.
A small-diameter cylindrical portion 13 is fitted, and a large-diameter cylindrical portion 1 is fitted to the upper end of the small-diameter cylindrical portion 13 of the base 11 via an annular stepped portion 15.
4 is provided coaxially with the small-diameter cylindrical portion 13 , and a locking collar 16 is bent outward and integrally formed on the outer periphery of the opening edge of the large-diameter cylindrical portion 14 , and a locking piece 18 of the cap 17 is pressed against the lower surface of the locking collar 16 of the cap 11, and a valve seat 21 that engages with the annular stepped portion 15 of the cap 11 is integrated at the end of the fitting portion of the connecting pipe 12 located inside the cap 11. It is formed.

The locking flange 16 of the cap 11 is provided with a notch (not shown) that serves as a passage for the locking piece 18 of the cap 17, and the cap 17 is attached to and detached from the cap 11 using the notch of the locking flange 16. Ru.

A valve 19 is disposed inside the large-diameter cylindrical portion 14 of the cap 11, and the valve 19 is pressed against the end surface of the valve seat 21 of the connecting pipe 12 by the biasing force of a spring 20.

The outer diameter of the large diameter cylindrical portion 14 of the continuous pipe 12 is the same as that of the small diameter cylindrical portion 13.
The outer diameter of the valve 19 disposed inside the large-diameter cylindrical portion 14 of the continuous pipe 12 is smaller than the inner diameter of the large-diameter cylindrical portion 14, and the outer diameter of the small-diameter cylindrical portion 13 It is considered to be larger than the diameter.

FIG. 4 shows a method of joining the cap 11 to the continuous pipe 12, in which the small diameter cylindrical portion 1 of the cap 11 is attached to the fitting portion, which is a small diameter portion stepped near the end of the continuous pipe 12.
3, insert the heat forming head H from the upper edge opening of the large diameter cylindrical portion 14 of the cap 11, and
A connecting pipe 1 located protruding inside the large diameter cylindrical part 14 of
By pressing the end of the fitting part 2 with the thermoforming head H, the valve seat 21 that engages with the annular stepped part 15 of the base 11 is formed at the end of the fitting part of the connecting pipe 12 as shown in FIG. The cap 11 is heated and deformed as shown by the dotted chain line.
The small diameter cylindrical portion 13 is fixed to the fitting portion of the continuous pipe 12.

Effects of the Invention As described above, according to the synthetic resin header tank of the present invention, the fitting portion is formed on the outer periphery near the end of the synthetic resin connecting pipe 12 that is integrally formed and protrudes from the outside of the tank body. The small-diameter cylindrical portion 13 of the metal cap 11 is fitted into the small-diameter cylindrical portion 13 of the metal cap 11, and the large-diameter cylindrical portion 14 is connected to the small-diameter cylindrical portion 13 of the cap 11 via the annular stepped portion 15.
A valve seat is provided coaxially with 3 and has a locking collar 16 formed on the outer periphery of the end of the large-diameter cylindrical portion 14, and engages with the annular stepped portion 15 of the cap 11 at the end of the fitting portion of the connecting pipe 12. Since the cap 11 is made of metal, the locking collar 16 of the cap 11 will not be deformed or damaged even if pressure and temperature from the cooling water of the tank body act on the cap 11. Therefore, a decrease in the holding pressure of the tank body can be completely prevented, the pressure holding ability of the connecting pipe 12 will not deteriorate, and the valve seat 21 of the connecting pipe 12 will not fit into the annular stepped portion 15 of the mouthpiece 11. Because of this, the coupling of the cap 11 to the connecting tube 12 becomes extremely strong, and after fitting the small diameter cylindrical portion 13 of the cap 11 to the fitting portion of the connecting tube 12,
A connecting pipe 1 located inside the large-diameter cylindrical portion 14 of the cap 11
It is convenient because the attachment of the cap 11 to the connecting pipe 12 and the formation of the valve seat 21 can be performed at the same time by simply forming the locking collar 16 at the end of the fitting portion of the valve 2.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventionally known synthetic resin header tank, Fig. 2 is a cross-sectional view of the main part of the injection port shown in Fig. 1, and Fig. 3 is a synthetic resin header tank according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of the main part of the injection port section, showing a method of joining the mouthpiece to the continuous pipe of FIG. 3. DESCRIPTION OF SYMBOLS 1... Tank body, 2... Connecting pipe, 3... Inlet part, 4... Cap, 5... Locking collar, 6... Engaging piece, 7... Valve, 11... Cap, 12... …connection,
13...Small diameter cylindrical part, 14...Large diameter cylindrical part, 15...
Annular step, 16...locking collar, 17...cap, 18...locking piece, 19...valve, 20...spring, 21...valve seat, H...thermoforming head.

Claims (1)

[Scope of utility model registration request] In a synthetic resin header tank in which a synthetic resin connecting pipe 12 is integrally formed so as to protrude outside the tank body, a small diameter cylindrical portion of a metal cap 11 is attached to a fitting portion formed on the outer periphery of the connecting pipe 12 near the end. 13, and connect the large diameter cylindrical part 14 to the small diameter cylindrical part 13 of the base 11 via the annular step part 15.
A locking collar 16 is formed on the outer periphery of the end of the large-diameter cylindrical portion 14 and is engaged with the annular stepped portion 15 of the cap 11 at the end of the fitting portion of the connecting pipe 12. A synthetic resin header tank characterized by forming a valve seat 21.