JPS5915820Y2 - Press-fit type sleeve washer for pipe end connection - Google Patents

Description

[Detailed description of the invention] This invention is designed to be used for piping for supplying oil or air to high-pressure fuel injection pipes or other various mechanical devices, and is designed to provide pipes with a diameter of 3Q m, which are frequently used.
A sleeve that is press-fitted onto the back surface of a connecting head formed at the end of a metal tube with a relatively small diameter of about 100 mm or less, and is connected to a mating member by pressing with a tightening nut. It concerns washers.

Conventionally, as shown in FIGS. 4 and 5, this type of sleeve washer has been assembled by using the front surface of the flange 11 that stands up at right angles as the pressing surface 12, and by simply aligning the peripheral wall of the hole 13 parallel to the axis. Therefore, this sleeve washer is placed in contact with the back surface of the neck in the direction perpendicular to the connecting head 16 formed at the end of the thin metal tube 15. When connecting to a mating member in a mated state, the seat surface of the connecting head 16 may come into contact with one side due to variations in the bending shape or defects on the metal tube 15 side. The more bending stress occurs and the material becomes fatigued, the more the back of the flange 11 and the tightening nut (not shown) stand perpendicular to the axis, which has almost no automatic centering function as it is tightened. ), the connecting head 16 due to vibrations of the engine.
There were drawbacks such as cracks and breakage often occurring near the bottom of the sleeve washer or from the base of the flange 11 of the sleeve washer.

The purpose of the present invention is to provide a pressure-fit type sleeve washer for connecting pipe ends that eliminates the above-mentioned conventional drawbacks. Consisting of an inclined pressing surface with an open front surface that abuts and engages the pressure-receiving inclined surface of the connecting head provided at the end of the diameter metal tube, and a cylindrical surface that press-fits onto the outer circumferential surface of the tube near the bottom of the head neck, Furthermore, the retaining pressure receiving surface on the outer circumferential side with the tightening nut is a conical inclined surface, and the assembly is constructed so that the area near the wall where the inclined pressing surface on the hole side and the cylindrical surface intersect is the thickest. Therefore, even if the seat surface of the connection head hits unevenly due to variations in the bending shape of the pipe side as a product or defects, and excessive tightening is performed, the pressure-receiving surface remains securely connected to the tightening nut. is a conical inclined surface, and the surface that abuts and engages with the pressure-receiving inclined surface of the connecting head is an inclined pressing surface.As a result, the automatic centering function is performed by these inclined surfaces, and at the same time, the surface near the bottom of the head and neck By making the area closest to the wall where it is positioned and assembled the innermost part of the box, cracks and breakage from this area are prevented.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a front view showing an embodiment of the pressure-fit type sleeve washer for connecting pipe ends of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a similar one showing the connection state in use. It is a partial notch side view.

In the figure, reference numeral 1 denotes a mounting hole penetrating through the shaft core, and the peripheral wall of the hole is a pressure-receiving inclined surface at the rear of the back of the connecting head 8 provided at the end of the thin metal tube 7 (see Fig. 3). It is composed of an inclined pressing surface 2 that is open at the front so as to abut and engage with the pipe, and a cylindrical surface 3 that is press-fitted to the outer circumferential surface of the tube near the lower part of the head and neck at the rear thereof.

Reference numeral 4 denotes a pressure receiving surface that engages with the inner bottom of the tightening nut 6 (see Fig. 3) on the outer circumferential side, and covers the entire surface from the tip periphery of the open inclined pressing surface 2 to the rear end periphery of the cylindrical surface 3. It is a conical inclined surface toward the rear, and the inclined pressing surface 2 in the hole 1 is used for assembly.
The thickest wall T is located near the wall where the cylindrical surface 3 and the cylindrical surface 3 intersect.

Note that 9 is a mating connection base. With this configuration,
The assembly consists of the structure of the inclined pressing surface 2 and the cylindrical surface 3 in the hole 1, and the conical inclined surface that is the pressure receiving surface 4 on the outer circumferential side, with the thickest T near the lower wall of the head neck. from,
As a product, even if the seat surface of the connection head 8 hits one side due to unevenness or defects in the bending shape of the pipe side, and the tightening is forced, the automatic centering function will adjust the adjustment without difficulty, and the thick wall T will allow for easy alignment. This is extremely effective in that it can even more effectively reduce or prevent cracks and breakage from the lower part of the connecting head 8 due to engine vibration during use.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the pressure-fit type sleeve washer for connecting pipe ends of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 similarly shows the state in which it is used and connected. 4 is a front view showing a conventional sleeve washer, and FIG. 5 is a sectional view taken along line BB in FIG. 4. 1... Assembling hole, 2... Inclined pressing surface, 3... Cylindrical surface, 4... Inclined pressure receiving surface, 6... Tightening nut, 7...
・Small diameter metal tube, 8...Connection head.

Claims (1)

[Scope of utility model registration request] For assembly through the shaft core, the peripheral wall of the hole is connected to an inclined pressing surface with an opening in the front so that it abuts and engages the pressure receiving inclined surface at the rear of the connecting head provided at the small diameter metal end, and the inclined pressing surface behind it. and a cylindrical surface that press-fits onto the outer circumferential surface of the tube near the bottom of the head and neck, and furthermore, the retaining pressure receiving surface on the outer circumferential side with the tightening nut is formed by extending the cylindrical surface from the tip periphery of the opened inclined pressing surface. A tube characterized in that by forming a conical inclined surface backward to the peripheral edge of the rear end, the wall portion near the wall where the inclined pressing surface and the cylindrical surface intersect on the hole side is the thickest. Press-fit sleeve washers for end connections