JPS6346654Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for cooling a piston of an internal combustion engine.

The so-called oil jet device, which sprays lubricating oil onto the inside of the piston in order to cool the piston, as shown in Figure 1, connects the base of the curved jet pipe A to a connector L that is fixed by brazing. Drill a hole for a dowel pin in the cylinder block, and then drill a hole for a dowel pin in the cylinder block to regulate the direction of the jet pipe A with respect to the piston, fit the dot pin into the dot pin holes A and D, and tighten the connecting tool with the mounting bolt. It has a structure in which it is assembled by sandwiching it, and then screwed into a female threaded part carved in a passageway communicating with the oil gear for fixation.

After the oil jet device is assembled, there is no need to remove it except for repairs, so if it has a vibration-proof structure and the direction of the jet pipe relative to the piston remains unchanged, the structure should be as simple as possible. desirable.

This device has fewer parts than conventional devices, reduces the number of man-hours for screw machining, drilling, etc. as much as possible, and is easy to install. An open passage is provided in the cylinder block, and a press-fit limiting annular pressure contact portion is formed at the press-fit base of the jet pipe with the jet nozzle end directed toward the inside of the piston or at the press-fit base of the coupling to which the jet pipe is fixed, and the passage is A piston cooling method for an internal combustion engine in which the press-fit base of the jet pipe or the press-fit base of the coupling is press-fitted into the cylinder block, and the press-fit limiting annular pressure contact part is brought into pressure contact with the inner surface of the cylinder block, and the direction of the jet pipe relative to the piston remains unchanged. It is a device.

An embodiment of the present device will be described with reference to FIG. 2. The lower end of the passage 3, which communicates the upper end with the oil gear gallery 2 of the cylinder block 1, has an opening 5 in the downward inner surface 4 of the cylinder block 1. Chamfer the periphery slightly larger to create pressure contact surface 6
has been formed.

Next, an upward U-shaped ejection pipe 7 is provided.
The ejection port 8 formed at the upper end of one rising part of the ejection pipe 7 is shaped like a constrictor and directed toward the inside of the piston 9. The other rising part is used as a press-fit base 10. A press-fit limiting annular pressure contact portion 11 is formed in a bulging manner on the outer periphery.

The outer periphery of the press-fitting base 10 above the annular press-fitting part 11 for press-fitting is dimensioned so that it can be press-fitted into the passageway 3 by driving, etc. The length between the upper end 10a of the press-fitting base 10 and the annular press-fitting part 11 for press-fitting limit is determined so as to come into contact with the press-fitting surface 6 of the press-fitting base 10 to restrict a predetermined press-fitting length of the press-fitting base 10.

The press-fitting base 10 of the jet pipe 7 is driven into the passage 3 of the cylinder block 1 while determining the direction of the jet pipe 7 with respect to the piston 9 using a driving jig (not shown), and the press-fitting annular pressure contact portion 11 is pressed against the contact surface. 6 and fix the jet pipe 7 to the cylinder block 1 with a predetermined press-fit length.

Since the device of the present invention is constructed as described above, the press-fit base 10 of the jet pipe 7 is inserted into the passage 3 communicating with the oil gear gallery 2 of the cylinder block 1 using a driving jig (not shown). When the pressure contact part 11 is brought into pressure contact with the pressure contact surface 6, the press-fit length of the press-fit base 10 of the injection pipe 7 is determined, and the vertical setting position of the injection pipe 7 and the orientation with respect to the piston 9 are also determined.
After setting, the direction of the injection pipe 7 remains unchanged, and lubricating oil passes through the injection pipe 7 from the oil gear rally 2 to the injection port 8.
The lubricating oil spouted to the inside of the piston 9 is sprayed to the inside of the piston 9 with a predetermined directivity.

The ones shown in FIGS. 3 and 4 are respectively deformed sides of the ejection pipe, and the ejection pipe 12 shown in FIG. The diameter gradually decreases toward the ejection port, and the ejection pipe 13 shown in FIG. 4 is formed by cold-forming a thick-walled pipe.

5 and 6 are other embodiments of the present device, in which the ejection pipe 14 has an inverted F-shape with the base 15 of the ejection pipe 14 being horizontal, and the passage 3
A press-fitting base 16 that can be freely press-fitted is formed on the upper part, and a vertical hole 1 is opened at the upper end surface of this press-fitting base 16.
A connector 19 having a horizontal hole 18 communicating with the base 1 is provided, and the base 1 is inserted into the horizontal hole 18 of the connector 19.
5 is fixed, the coupling tool 19 and the ejection pipe 14 are integrally coupled, and an annular press-fitting part 21 for press-fitting limit is formed at the boundary between the press-fitting base 16 and the lower part 20 of the coupling tool 19. 16 is press-fitted into the passage 3, and an annular press-fitting portion 21 for press-fitting is brought into press-contact with the press-fitting surface 6 to regulate a predetermined press-fitting length. Therefore, in this embodiment as well, installation is completed by driving and press-fitting the connector 19 to which the ejection pipe 14 has been integrally connected in advance into the passage 3. In this case, both side surfaces 22, 22 of the coupling tool 19 are used as surfaces for regulating the driving direction by the driving jig.

In this embodiment, the passage 3 communicating with the oil gear gallery 2 is formed downward, but it is formed sideways so as to open on the inner surface of the cylinder block 1, so that the passage 3 is formed in an inverted shape as shown in Fig. 5. A passage 3 that communicates with the oil gear gallery 2 and opens on the inner surface of the cylinder block 1 may be inserted by force-fitting a pipe.
, and a jet pipe having a press-fit limiting annular portion formed therein is press-fitted into the passage 3.

The proposed device can accurately spray lubricating oil inside the piston, and compared to conventional devices, the number of parts is greatly reduced and the number of machining steps is reduced as much as possible, which improves productivity and can be provided at a low price. The effect is significant.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of the conventional device, Fig. 2 is a sectional view of the main part of the proposed device, Figs. 3 and 4 are sectional views showing modified examples of the ejection pipe, and Fig. 5 is the proposed device. FIG. 6 is a sectional view of a main part showing another embodiment, and FIG. 6 is a bottom view of the ejection pipe and the coupling tool in FIG. 1... Cylinder block, 2... Oil gear gallery, 3... Passage, 4... Inner surface, 5... Opening, 6...
...Pressure surface, 7, 12, 13, 14...Ejection pipe, 8
. . . Jet port, 9 . . . Piston, 10, 16 .

Claims (1)

[Scope of utility model registration request] The cylinder block is provided with a passage that communicates with the oil gear gallery of the cylinder block and opens on the inner surface of the cylinder block, and the press-fit base of the jet pipe has its jet end directed toward the inside of the piston, or the joint to which the jet pipe is fixed. A press-fit limiting annular pressure contact part is formed in the press-fit base, and the press-fit base of the ejection pipe or the press-fit base of the coupler is press-fitted into the passage, and the press-fit limit annular pressure contact part is pressed against the inner surface of the cylinder block, and the piston A piston cooling system for an internal combustion engine in which the direction of the ejection pipe remains unchanged.