JPS62255610A - Connecting rod - Google Patents

Abstract

PURPOSE:To simplify unbolting and bolting by coupling the small end of a connecting rod to a piston pin with common bolts to reduce the number of bolts to be used. CONSTITUTION:The threaded portion 42a of a bolt 42 inserted in common through inserting holes 43, 56 is threadably attached to a tapped hole 47 formed downward on the mounting surface 32a of a piston pin 16. A nut 60 is threadably attached to the other threaded portion 42b of the bolt 42 on the lower side of the small end 51 of a connecting rod. Thus the bolt 42 fixes the said small end 51 to the piston pin 16 through a spacing piece 17. Therefore the number of the bolts to be used can be reduced to simplify unbolting and bolting in carrying out maintenance.

Description

Description: TECHNICAL FIELD The present invention relates to a structure for coupling a piston pin of an internal combustion engine to a connecting rod small end.

Background technology The US technology is shown in Figure #S4. The piston 71 is
It is connected to the connecting rod 1 via a piston pin 2. 2
! ! The connecting rod 1 has a small end that is fastened to the piston pin 2 by a bolt 3, and a large end 6 that is connected to the stem 4 and is fixed to the stem IS4 by a bolt 5, and a large end 6.
It consists of a large end cap 7 which is secured by bolts 8 to the holder. The dividing planes of these connecting rods are referenced 72, 73, 74
It is shown in

When maintaining the piston pin 2 of the piston 71, remove the bolt 5 and connect the trunk 4 of the connecting rod 1 so that the work can be done without separating the large end 6 of the connecting frame and the large end cap 7. It is separated from the large end portion 6 by a dividing surface 73.

Another prior art is as shown in FIG.
a and the large end 6a are configured to be divided by the bolt 5& at a dividing surface 75 that is closer to the large end 6a than in the American technique shown in FIG.

Problems to be Solved by the Invention The problem with these American technologies is that the number of bolts for connection at the dividing surface of the connecting rod is relatively large, and therefore the work of tightening the bolts is also large. It takes a lot of effort to check the fastening state of the bolts.

The present invention solves the above-mentioned problems by reducing the number of bolts that fasten the connecting rod, and provides a connecting rod structure that facilitates maintenance of pistons and the like.

Means for Solving the Problems The present invention is characterized in that the piston pin and the small end of the connecting rod are removably fastened by a common bolt with a spacing piece interposed therebetween. .

Function: In the present invention, the small Ia portion of the connecting rod is removably fastened to the piston pin with a common bolt via a spacer piece. Therefore, during maintenance of the piston or piston pin, the lower surface of the spacer serves as a dividing surface, and the connecting rod is divided at that dividing surface. As a result, when the connecting rod body is angularly displaced integrally with the crankshaft, the ig
This prevents the cylinder liner from coming into contact with the lower end of the cylinder liner.

Embodiment 11 FIG. 11 and FIG. 2 show cross sections of an embodiment of the present invention. The top of the cylinder liner 11 of an internal combustion engine with a trunk piston is closed off by a cylinder head 12 . The sill liner 1] is surrounded by a shilling jacket 13. A piston 14 is housed within the cylinder liner 11. A piston pin 16 is supported by the piston 14 via a bearing 15. There is a spacing piece 17 at the bottom of the piston pin 16, and a connecting rod body 18 is bolted to the lower part of the spacing piece 17. The connecting rod body 18 is connected at its large end to a crank bin 20 via a bearing 19. The crank pin 20 is fixed to a crank arm 21, and the crank arm 21 is fixed to a crankshaft 22. A counterweight 23 is formed on the opposite side of the crank arm 21. The crank chamber 24 has a frame 25
It is divided by. This rack v! On the side of 25,
Windows 2G and 21 are provided for maintenance, and window 26
．． 27 is closed by Tt13.291 so that it can be opened and closed. The frame 25 is fixed in a fixed position by a bed plate 30, for example to the bottom of the ship when used on a ship.

The lower part of the crank chamber 24 is an oil pan 31.

FIG. 3 shows an exploded structure of an embodiment of the invention. Both ends of the piston pin 16 in the axial direction have cutouts that open downward! 32 and 33 have been formed. In this notch 32.33, a recess 37 into which the intermediate portion 36 of the piston pin 16 fits is formed between the upper portions 34.35 of the 0-spacing piece 17, which are in contact with the pair of upper portions 34.35 of the spacing piece 17. to be done1
an inner surface 34a facing the recess 37 of the upper part 34.35 of the spacing piece;
35a is the outer surface 3 of the intermediate piston pin 111s3G
6a.

36b, respectively. The fixing bolt 39 is inserted through an insertion hole 40 formed in the upper part 34 of one of the spacing pieces, and is screwed into a screw hole 41 formed in the outer surface 36a of the intermediate n36 of the piston pin. As a result, the piston pin 16
The thin wire of the piston pin 1G is attached to the spacing piece 17 to prevent the spacing piece 17 from falling off from the piston pin 1G even when a bolt 42 (described later) that fastens the spacing piece 17 to the piston pin 1G is removed. Through holes 43, 44; 45, 46 for fastening bolts are formed, respectively, extending vertically and vertically.

Second insertion hole 43. , i4;ss, 4G, the notches 32 and 33 at both ends of the piston pin 16 are attached to the surface 32.
Screw holes 47 and 48:49.50 are formed in a and 33a, respectively.

The connecting rod main body 18 includes a connecting rod small end portion 51 having a 7-run shape;
A trunk i52 extending downward from the second connecting rod small end 51, a connecting rod large end 53 connected to the trunk 52, and a connecting rod large end 953.
and a large end cap 55 secured by bolts 54 to the holder. The connecting rod big end 53 and the big end cap 55 are:
As described above, it is connected to the crank bin 20 via the bearing 19.

The connecting rod small end 51 has insertion holes 43 and 44 for the spacing piece 17.
; Through holes 5 [), 5 corresponding to 45 and 46 individually
7; 58, 59 are formed. The upper end surface Sia of this connecting rod small end portion a section 51 is the lower end surface 1 of the IJ1 partition piece 17.
7b. The threaded portions 42a of the bolts 42, which are commonly inserted through the insertion holes 43 and 56, are hinged to threaded holes 47 formed downward in the surface 32a for mounting the screw pins 16. A nut 60 is screwed into the other threaded portion 4211 of the bolt 42 from below the connecting rod small end 51. In this way, the bolt 42 connects the piston pin 16 to the connecting rod small end through the spacing piece 17. 51 is fixed.The remaining insertion holes 44, 45, 46 and the corresponding insertion holes 57, 5 are fixed.
The same applies to 8.59.

Upper end surface 51 of connecting rod small end 51 fixed to spacing piece 17
a shows the connecting rod small end 51 and the spacing piece 17 with the crank pin 20 in the lowest position as shown in FIGS. 1 and 2.
The connecting rod main body 18 is separated and integrated with the crank pongee 22.
When rotated, the upper end surface 51a of the connecting rod small end 51
The vicinity thereof is determined so as not to come into contact with the lower end portion 11a of the cylinder liner 11. The axis of the crank Tsumugi 22 is tjS1
It is indicated by reference numeral 62 in the figure.

During maintenance, place the crank pin 20 in the lowest position as shown in Figure Pt51 and Figure @2, then remove the cover 28 and open the window 26. There, insert the crank pin 20 into the insertion hole 56 of the connecting rod small end 51 of the connecting rod main body 1a. Compatible nuts 60 and bolts 4
2 is removed, and the nuts and bolts associated with the remaining insertion holes 57, 58, and 59 are also removed at the same time. At this time, the spacing piece 17 remains connected to the piston pin 16 by the stop bolt 39 and falls. Never.

Next, by fixing the trunk 52 of the connecting rod main body 18 to the counterweight 23 using a roughly U-shaped fixing fitting 63 as shown in FIG. 2, it is possible to rotate the crank pongee 22. Thus, the state indicated by reference numeral 64 in FIG. 1 can be achieved.

Effects As described above, according to the present invention, the small end of the connecting rod is fastened to the piston pin by a common bolt with a spacing piece interposed, so that the number of bolts can be reduced. At the same time, it becomes easier to release and tighten bolts during maintenance, and it is also easier to check the tightened state of bolts.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an internal combustion engine according to an embodiment of the present invention, FIG. 2 is a sectional view showing the crank pin 20 in the lowest position, and FIG. 3 shows the piston pin 16 and related components. An exploded perspective view, FIG. 4 is a front view showing the configuration of the prior art,
FIG. 5 is a front view showing the configuration of another prior art. 16...Piston pin, 17...Spacer piece, 18...
・Connecting rod body, 42, 54... Bolt, 52... Executive, 53... Connecting rod big end, 55... Big end cap Agent Patent attorney Number of strokes Keiichi 4th prisoner, 171st Figure 5

Claims (1)

[Claims] A connecting rod characterized in that a piston pin and a small end of the connecting rod are fastened together by a common bolt with a spacing piece interposed therebetween.