JPS58148036A - Manufacture of connecting rod of internal-combustion engine - Google Patents

Abstract

PURPOSE:To manufacture a connecting rod at low cost and high productivity, by blanking cut pieces corresponding to the shape of a connecting rod from a thin plate, and joining them to layered form. CONSTITUTION:Materials 20, 30 consisting of connected plural cut pieces 21, 22, 23 and 31, 32, 33 corresponding to horizontally cut and developed shape of a connecting rod composed of a body 2 consisting of a small end part 2a having a pin hole 4, a rod 2b and a large end part 2c having a bolt hole 4, and a cap 3 provided with bolt holes 5 are blanked from a thin plate. The material 20 of connecting rod is provided with small end side pin holes 24, a large end side pin hole 26, groove long holes 24 and a long hole 27 for hollowing the rod part, and the cap material 30 is provided with a large end side pin hole 26, a groove long holes 35 for bolt holes etc. Above-mentioned materials 20, 30 are bent along connecting lines X1, X2 and Y1, Y2, respectively and cut pieces 21, 22, 23, 31, 32, 33 are joined by spot welding etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention describes a method of manufacturing a connecting rod in an internal engine.

The conventional internal combustion engine connecting rod (including the big end cap) shown in Fig. 1, like the tI4, is made of hot-forged leg steel material or spheroidal graphite #
The most common type is one made of iron or the like using a casting method. However, in some cases, the heating of the material or! What is the heat treatment process such as WM11 (8'1k) and the requirements for each manufacturing method? From 1Iljfl to IJ [9th, it is necessary to secure a relatively large filling allowance for 1Il, the thermal energy during the production of those 1Ills, and the unexplored allowance σ], there is a natural limit to the improvement of productivity. , no significant cost reduction can be expected.

In addition, instead of the above-mentioned hot forged or partially formed connecting rods, cold (vl*! or FRPJI)
A connecting rod of I is partially proposed. However, in the former case, there is a considerable gap in creating the shape of the connecting rod with the current Giyusui 1111, and in the latter case, it is difficult to create a connecting rod shape while maintaining the continuity of the material. Rod shape vFlt
Since it is difficult to shape, it is disadvantageous in terms of strength, and even in the case of Izuo, it has not yet been put into practical use.

In view of the above-mentioned points, the main purpose of the present invention is to provide a method for manufacturing a connecting rod that is highly productive and can reduce costs. The feature is that a material consisting of several folded pieces vl [corresponding to That is.

Next, embodiments of the present invention will be described in detail based on the drawings.

That is, FIG. 2 shows an embodiment of the connecting rod 1 spun by the method of the present invention f0 This connecting rod 1 is composed of a main body s2 and a cap 3 like the surrounding ones conventionally, and further includes: The main body part 2 consists of a small end part 2& with a pin hole 4 formed therein, a rod part 2b and a large end part 2c, and a bolt hole 4.5 is formed in each of the main body part 2 and the cap 3. be.

As is clear from FIG. 3, the main body s2 has a shape obtained by cutting and expanding an existing connecting rod horizontally into slices, and has a plurality of (three in this embodiment) σ corresponding to the shape of the main body 2. ) A flat connecting rod material 20 formed by consecutively forming folded pieces 21°, 22.28 was punched out from a sheet metal material (not shown) by press uniform pressure, and the punched connecting rod material 20 was folded and folded. This connecting rod material is 20
During the punching process, in addition to the pin hole 24 on the small end and the pin hole 26 on the large end side, an elongated hole 27 for hollowing out the rod flange 2b and a hole for forming the bolt hole 4v# are formed. 4
The elongated hole 24 is formed at the same time.In other words, the main body part 2 is made by folding the Ktllll fold pieces 21 consecutively from @ Similarly, fold the folded piece 21 in the opposite direction from #111X2 and attach it to the center folded piece 22
, 22. 23t It is to be joined by spot contact or plug welding. From K, the whole is bare as shown in Fig. 2.
It is structured in the form of Note that the joint parts are omitted.

The same goes for the cap 3, as shown in FIG.
Y chant* It consists of Y2 and K, which is folded and gives a bathing touch. Note that it is desirable to use a high-tensile steel plate as the primary sheet metal material.

In the case of this example, since the structure is punched out using a press and then folded, there is no need for conventional heat treatment, and it is not only superior in productivity but also advantageous in terms of energy conversion. It is important to be able to keep a sharp and small eye on people.

In the embodiment shown in FIGS. 5 and 16, each folding piece 2! .

As a joining means for the 231i1 and 231i1, instead of the previous welding, a structural thread adhesive 40 is interposed between each contact piece 21, 22. It is exactly the same as the example.

Structure In the embodiment shown in Fig. 7, as shown in Fig. 8, the connecting rod material 2 is made by using a laminated material W with a blind end adhesive 40 pasted in advance on both the front and back surfaces of the substrate P<, as shown in Fig. 8.
0 is punched out and bent accordingly to form the connecting rod 10 body part 2.
By adding , the whole structure is made into a multi-four shape.

In the embodiment shown in Figure 9, the distance between each contact piece 21, 22, and 23? It is made by sandwiching high-strength, lightweight members 42 of RP4 and bonding them together with an adhesive 40, which has the advantage of improving strength without significantly increasing the weight of lf#.

In summary, according to the present invention, a material in which a plurality of folded pieces corresponding to the shape of the main body or the cap of a connecting rod are arranged in a row is punched out from a sheet metal, and the material is folded from each of the continuous parts. Since the folded pieces are joined together to form a double L-shape, there is no need for conventional heat treatment, which immediately improves productivity and is advantageous in terms of energy consumption. This has the effect of being able to significantly reduce costs overall by minimizing costs.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the shape of a conventional connecting rod, Fig. 2 is an overall perspective view showing the structure of a connecting rod improved by the method of the present invention, and Fig. 3 is a perspective view of the connecting rod shown in Fig. 2. Figure 4 is a developed view of the main body, figure 4 is a developed view of the cap, figure w45 and figure 6 are explanatory views showing other embodiments of the non-inventive method, figures 7 and 8.
The figure is also an explanatory diagram showing another embodiment of the method of the present invention, No. 9
The figure is an explanatory diagram showing still another embodiment of the present method. 1... Connecting rod, 2... Main body, 3.
...Cap, 20...Connecting rod material,
21゜22.21...Folded piece, 30...Cap material, 31゜32.33...Folded piece, cut* x, t Y chanteY2...Continuous edge.

Claims (1)

[Claims] (1) A plurality of folded pieces tl corresponding to the shape of the connecting rod main body or cap are punched out from a sheet metal, and this material is folded from each connecting portion to intertwine each folded piece [11 A method for manufacturing a connecting rod for an internal combustion engine, which comprises combining the connecting rods into a compound knot shape.