JPS5837310A - Connecting rod of internal-combustion engine - Google Patents

Abstract

PURPOSE:To enable a main body part and a cap part which are formed by splitting the large end part of the connecting rod into two to be reassembled easily with a high reassembling accuracy by arranging three or more split assisisting holes in zigzag manner in left and right split parts of the large end part of the connecting rod. CONSTITUTION:The connecting rod 11 provided at its large end part with a bearing hole 13, a bolt hole and split assisting holes 16, 17 and 18 is subjected to cementation hardening. Then, a pair of split collars 19A and 19B are inserted into both sides with respect to a split line within the bearing hole. A wedge 20 is driven into a space formed between both split collars 19A and 19B whereby the large end part 12 is split into the main body part 12A and the cap part 12B. Upon this occasion, rupture surfaces 21 produced on left and right split parts of the large end part are guided by split assisting holes 16, 17 and 18 mutually arranged in zigzag shape, and formed in a substantial V shape. Upon reassembling, both the main body part A and the cap part B are automatically aligned by clear depressed and projected parts formed on the rupture surfaces.

Description

[Detailed description of the invention] The present invention relates to a connecting rod for an internal combustion engine.

Conventionally, connecting rods whose large end is divided into two parts are guided to advance the fracture surface by dividing auxiliary holes arranged in a straight line on each of the left and right divided parts of the large end. The part can be divided into two parts, a main body part and a cap part.

However, in the conventional large end, the left and right angles are 4 degrees, 1 degrees, -11 degrees, and so on. Since the gap is □, 5ゎ, the divided fractured surface becomes a flat surface, and it is sometimes difficult to reassemble the main body portion and the cap portion with a high level of accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a connecting rod for an internal combustion engine, in which a main body portion and a cap portion that are divided into two parts can be easily reassembled with high precision.

In order to achieve the above object, the internal combustion end according to the present invention has two
It was created by dividing it into parts.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the main parts of the connecting rod according to the present invention and how the connecting rod is divided, FIG. 2 is a side view showing the connecting rod, and FIG. 3 is a plan view showing how the connecting rod is divided. FIG.

After the connecting rod 11 is forged, it is copper plated to prevent carburization, and a small end (not shown) is machined with a hole, and a large end 12 is provided with a bearing hole 13 for back-supporting a plain bearing, and a split. Bolt holes 14 for Bordeaux that enable tightening of the rear cap part to the main body part are provided, and bolt holes 14 are provided in the left and right divided parts 15, which are symmetrically located with respect to the center of the bearing hole 13. Three dividing auxiliary holes 16, 17, 18 are drilled in each case. Here, the division auxiliary holes 16, 17, 18 are the bearing holes 13
They are sequentially arranged from the inside to the outside in the diametrical direction with respect to the center O, that is, in the direction of the dividing line, and are also arranged in a staggered pattern, that is, in a substantially V-shape.

As mentioned above, the large end 12 has a bearing hole 13 and a bolt hole 14.
The connecting rod 11 with the auxiliary dividing holes 16, 17, and 18 drilled therein is then carburized and quenched, and then the connecting rod 11 shown in FIGS.
As shown in the figure, by inserting a pair of dividing collars 19AI9B on both sides of the dividing line in the bearing hole 13, and driving a wedge '20 between both side collars 19A, 19B, the large end 12 is connected to the main body 12A. and a cap portion 12B. At this time, each fracture surface 21 generated in each of the left and right divided portions 15 of the large end portion 12 is guided into the dividing auxiliary holes 16, 17, and 18 that are arranged in a staggered manner to form a substantially V-shape. The fractured surface on the main body portion 12A side is clearly concave with respect to the dividing direction, and the fractured surface on the canknob portion 12B side is clearly convex with respect to the dividing direction. In addition, the division auxiliary hole 16
．． The fracture surface 21 formed between 17 and 18 is the divided part 1
Due to the influence of the metallographic structure of No. 5, the dividing auxiliary holes on both sides 16.
18 intersects with the central part of the central division auxiliary hole 1T as shown in FIG. 4 (4), the division auxiliary hole 16.18 and the division auxiliary hole 17
(color in Figure 4) that intersects with the sides of the 4th auxiliary hole 16.
It can be in various states such as the state shown in Figure (0).

Also, (see Figure 4), (O is shown as the dividing auxiliary hole 17 at the center, but it could also be the auxiliary holes 16 or 18 at both ends.

According to the above embodiment, the left and right six-divided portions 15 of the large end portion 12
are three dividing auxiliary holes 16, 17 ., which are arranged in a staggered manner.
18, and a substantially V-shaped fracture surface 21 is formed.
When reassembling 2B after it is attached to the crank pin of the crankshaft in a split state, the two parts are sometimes automatically aligned by the clear unevenness formed on the fracture surface 21, and the two parts are aligned in the same way as before splitting. It becomes possible to reproduce the integrated state and easily reassemble with high refeeding accuracy.

In addition, in the above embodiment, the dividing auxiliary holes 16, 17, 18 bored in each of the left and right pollution parts 15 are
A force S1 formed symmetrically with respect to the longitudinal axis of the connecting rod 11 passing through the center 0 of the bearing hole 13 As shown in FIG. They may be arranged symmetrically. In that case, a concave portion, a convex portion, and a force S are formed on the left and right fractured surfaces of the main body portion 12Altl, and the left and right fractured surfaces ζ on the cap portion 12B side are scraped and convex, respectively. and a recess are formed.

In addition, in the above embodiment, three dividing auxiliary holes 16, 17, and 18 were bored in each of the left and right pollution Il sound μ and 15, but in the present invention, substantially the gold side auxiliary (shi force 5 The left and right divided portions may be arranged in a staggered manner, or each of the left and right divided portions may be provided with four or more auxiliary holes.

More. As shown in Fig. H, the connecting rod of the internal combustion engine according to the present invention has a left and right dividing part ζ of the large end, and a 1% shape ζ which is divided into two parts through three or more dividing auxiliary holes. , the large end part was designed to be damaged by 52 parts of the force, so that a fractured surface with clear unevenness in the dividing direction was formed on each of the left and right pollution U parts, and the main body part and the cannob which were divided into two parts were formed. This has the effect of making reassembly possible with greater refeeding accuracy and easier force.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a connecting rod according to an embodiment of the present invention and how it is divided; FIG. Fig. 4 is a cross-sectional view, (B) and (O are model diagrams showing different fracture situations of the connecting rod, and Fig. 5 is a plan view showing a modified example of the connecting rod. 12...Large end part, 12A Main body part. 12B... Cap part, 15... Divided part. 16.17.18... Divided auxiliary hole, 21 Fractured surface. Agent: Patent attorney Osamu Shiokawa

Claims (1)

[Claims] (1) Three parts arranged in a staggered manner on each left and right divided part of the large end.
A connecting rod for an internal combustion engine whose large end is divided into two parts through more than one auxiliary dividing hole.