JPS6128069Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a reciprocating compressor that performs lubrication by a reciprocating splash lubrication system.

First, a conventional reciprocating compressor using a splash lubrication system will be explained with reference to FIGS. 1 and 2. 1st
In the figure, 1 is a crankcase, 2 is a cylinder, 3 is a piston that reciprocates within the cylinder 2, and 4 is a cylinder.
is a piston pin inserted into the piston 3; 5 is a crankshaft having crank pins 5a, 5a and main bearing pins 5b; This is a connecting rod for transmitting power, and is constructed as shown in FIG. That is, in FIG. 2, the cooking rod main body 7 consists of a large end upper part 7a, a large end lower part 7b, a small end part 7c, and a rod part 7d that connects the large end upper part 7a and the small end part 7c. . A large end bearing 8 is fitted to the large end and has a two-part structure. Also, the large end bearing upper half 8a and lower half 8
b are respectively fitted into the large end upper part 7a and the large end lower part 7b, into which the crank pin 5a is fitted. 8c is a lubricating oil supply hole drilled in the large end bearing. Numerals 9, 9 are bolts that fasten the large end upper part 7a and the large end lower part 7b. 10 is a screw hole through which the bolt 9 is passed. Reference numeral 11 denotes a small end bearing fitted to the small end 7c, into which the piston pin 4 is fitted. 12 is an oil paddle attached to the lower part 7b of the large end. In FIG. 1, reference numeral 13 indicates a main bearing that pivotally supports the main bearing pin 5b of the crankshaft 5, reference numeral 14 indicates a bearing housing, and reference numeral 15 indicates lubricating oil accumulated in the lower part of the crankcase 1. The lubricating oil 15 is scattered onto each sliding surface by the oil paddle 12. 16 is a cylinder cover, and 17 is a valve seat plate.

Next, the effect of the lubricating oil with the above configuration will be explained. A part of the lubricating oil 15 splashed into the cylinder case 1 by the oil paddle 12 is supplied to the crank pin 5a and the big end bearing 8 through a lubricating oil supply hole 8c formed in the upper half 8a of the big end bearing. is supplied to the sliding surface. At this time, the lubricating oil 15 splashed onto the rod portion 7d of the connecting rod 6 flows down along the wall surface of the rod portion 7d, and only the lubricating oil that has been transmitted to the vicinity of the lubricating oil supply hole 8c lubricates the large end bearing 8. was contributing.

As described above, in the conventional reciprocating compressor, most of the lubricating oil 15 scattered on the rod portion 7d of the connecting rod 6 does not flow into the lubricating oil supply hole 8c, but adheres to the upper outer peripheral surface of the large end. Since the lubricating oil is not supplied into the big end bearing 8, the lubricating performance deteriorates due to a lack of lubricating oil, and wear of the big end bearing 8 is accelerated, sometimes leading to seizure.

This invention was made in order to eliminate the above-mentioned drawbacks, and in order to improve the lubrication performance of the big end bearing, a pair of lubrication sections extending from both sides of the rod part 7d to the upper surface of the upper part 7a of the big end part are provided. In addition to forming an oil groove, a prepared hole for the screw hole 10 of the bolt 9 that fastens the upper and lower parts 7a and 7b of the upper end portions to each other is formed to pass through, and the upper end of this prepared hole is used as a lubricating oil storage hole. do. In addition, regarding the polar coordinates of the big end bearing, with the center of the big end bearing as the pole and a straight line heading toward the center of the small end bearing 11 as the starting line, on the circumference of the big end bearing, ± (70° to 180°). At least one lubricating oil supply hole is provided in the region. Further, the lubricating oil supply hole and the lubricating oil storage hole are communicated through a lubricating oil communication hole.

With this configuration, the rod portion 7d of the cooking rod
The lubricating oil 15 sprayed on the lubricating oil 15 is effectively supplied to the big end bearing, and since the lubricating oil supply hole is located in an area where the pressure of the oil film inside the bearing is low, the bearing performance is less likely to be adversely affected by the rupture of the oil film inside the bearing. Lack of lubricant,
It is possible to eliminate problems such as wear and seizure without causing oil film rupture.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4. In FIG. 3, 18 is a large end bearing of the connecting rod 6 into which the crank pin 5a is fitted, and 18a and 18b are the upper and lower halves of the large end bearing. In addition, 18c and 18c are lubricating oil supply holes drilled in the large end bearing upper half 18a,
When polar coordinates are set with the center of the large end bearing 18 as the pole and a straight line directed toward the center of the small end bearing 11 as the starting line, they are located at ±90°. 19,19
4, is a lubricating oil groove provided in the direction in which the lubricating oil 15 is scattered, that is, from the side surface of the rod portion 7d parallel to the direction of the crankshaft 5 to the upper surface of the large end upper half portion 7a. be. Bolt screw hole 10
The pilot hole is formed so as to penetrate through the large end of the connecting rod, the threaded part is placed halfway through the upper part 7a of the large end, and the length of the bolt 9 is made shorter than the length of the pilot hole, thereby making it possible to store lubricating oil. A storage hole 20 is formed using the upper end of the prepared hole, and the lubricating oil storage hole 20 is communicated with the lubricating oil groove 19. 20a, 20a are lubricating oil communication holes that communicate the lubricating oil storage hole 20 and the lubricating oil supply hole 18c. Note that the other parts are the same as those in FIGS. 1 and 2, and their explanation will be omitted.

With the above configuration, the lubricating oil 15 splashed onto the rod portion 7d by the oil paddle 12 is transmitted through the lubricating oil groove 19 and stored in the lubricating oil storage hole 20, and is transferred from the lubricating oil communication hole 20a to the lubricating oil supply hole 18c. It is supplied to the sliding surface between the big end bearing 18 and the crank pin 5a through the shaft.

Furthermore, if the lubricating oil supply holes 18c and 18c are formed in the range of ± (70° to 180°) in the above polar coordinates, the state of the lubricating oil film in the bearing will be in the region where the minimum oil film thickness is large when viewed from the shaft center locus. Therefore, within this range, the lubrication performance will not be impaired.

As described above, according to this invention, a lubricating oil groove is provided on the surface parallel to the crankshaft in the rod part of the connecting rod, and a lubricating oil storage hole is formed using a screw hole in the upper part of the large end of the connecting rod. Since the lubricating oil groove is connected to the lubricating oil groove, and the lubricating oil storage hole and the lubricating oil supply hole provided in the big end bearing are connected through the lubricating oil communication hole, the lubricating oil splashed on the rod part is effectively transferred to the big end. The lubricant is supplied to the large end bearing and can improve lubrication performance, preventing wear and seizure of the large end bearing,
The reliability and durability of the compressor is improved.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing a conventional reciprocating compressor;
Fig. 2 is a partially sectional front view showing the connecting rod part, Fig. 3 is a partially sectional front view of the main part of an embodiment of this invention, and Fig. 4 is a plane along the - line in Fig. 3. FIG. In the figure, 3... piston, 4... piston pin,
5...Crankshaft, 5a...Crank pin, 6...
... Conn rod, 7a, 7b... Upper and lower part of large end of conn rod, 7a... Rod part, 9... Bolt,
10...Screw hole, 11...Small end bearing, 18...
Big end bearing, 18c... Lubricating oil supply hole, 19...
Lubricating oil groove, 20...lubricating oil storage hole, 20a... lubricating oil communication hole. In addition, the same symbols in the figures are the same,
or a corresponding portion.

Claims (1)

[Claims for Utility Model Registration] A large end portion consisting of upper and lower parts 7a and 7b, and a small end portion 7
a connecting rod 6 consisting of a rod portion 7d connecting C and the large end; a large end bearing 18 with a two-part structure that supports the crank pin 5a on the large end; and a large end bearing 18 attached to the large end at the lower end. Crankcase 1
an oil paddle 12 for splashing lubricating oil 15 accumulated on the bottom of the rod, and a pair of oil paddles 12 formed from both sides of the rod portion 7d parallel to the crankshaft 5 to the upper surface of the upper portion 7a of the large end portion. A lubricating oil groove 19 and a pilot hole for the screw hole 10 of the bolt 9 for fastening the upper and lower parts 7a and 7b of the large end to each other are formed so as to penetrate therethrough, and a pair is formed by the upper end of the pilot hole. On the circumference of the large end bearing 18, the lubricating oil storage hole 20 of °～180
at least one lubricating oil supply hole 18c provided in the area of ゜); and a lubricating oil communication hole 20a formed in the large end portion and communicating the lubricating oil storage hole 20 and the lubricating oil supply hole 18c. A reciprocating compressor equipped with .