JPH04133015U - connecting rod - Google Patents

Abstract

(57) [Summary] [Purpose] To reliably prevent metal seizing accidents caused by reverse assembly of the connecting rod and the same cap. [Structure] The dividing surfaces of the connecting rod and cap of internal combustion engines, etc. are provided with uneven parts that engage with each other, or the bolt holes for tightening the connecting rod and cap are arranged asymmetrically with respect to the center of the large end of the connecting rod. It is characterized by

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to prevention of reverse assembly of connecting rods of diesel engines.

0002

[Conventional technology]

In the conventional connecting rod shown in Fig. 7, connecting rod 1 and cap 2 When assembling the bolts, place them so that the engraved matching marks on both sides are in the same direction. I was tightening nut 3 and nut 4.

0003

[Problem that the idea aims to solve]

However, with conventional technology, it is difficult to assemble in the dark or remove engine oil or carbon. It is difficult to check the markings due to the adhesion of the connecting rod and cap. You may end up assembling it in the opposite direction to the specifications. At this time, the connecting rod is large. The roundness of the end metal cannot be ensured, resulting in insufficient oil film formation and the risk of metal seizure. There is a risk.

0004 The purpose of this invention is to solve the problems of the conventional device and to provide a connecting rod cap. To provide a connecting rod that can reliably prevent reverse assembly.

[0005]

[Means to solve the problem]

Claim 1 is characterized in that, as shown in FIG. It is characterized by having concave and convex portions that fit together. In addition, claim 2 is a connecting bolt hole for tightening the connecting rod and the cap. It is characterized by being arranged asymmetrically with respect to the center of the large end of the rod.

[0006]

[Effect]

In claim 1, if an attempt is made to tighten the connecting rod 1 and the cap 2 in opposite directions, In this case, it is impossible to install the rod bolt due to the convex part of the mating surface, so reverse assembly is recommended. It's actually preventable. In claim 2, if the rod and the cap are to be assembled in the opposite direction to the specified direction, The centers of the bolt holes on the rod side and the cap side do not match, making it impossible to install the rod bolt. This makes it possible to prevent reverse assembly.

[0007]

【Example】

An embodiment of the present invention will be described with reference to FIGS. 1 to 4. 2 and 3 show a combination of the connecting rod 1 and cap 2 of the first embodiment. The details of the section are shown. Concave groove on connecting rod 1 side, convex groove on cap 2 side rails are formed respectively, and a convex part on the cap 2 side and a connecting rod 1 side are formed. There is an appropriate gap in the recess. Next, the operation of the first embodiment will be explained. There should be an appropriate gap between the convex part on the cap 2 side and the concave part on the connecting rod 1 side. Therefore, the connecting rod 1 and cap 2 can be easily attached to the specified direction as shown in Figure 1. It is possible to reliably combine the two directions. However, I tried to assemble the connecting rod and cap in the opposite direction to the specified direction. In this case, it will be impossible to install the rod bolt due to the protrusion on the convex side of the mating surface. Reverse assembly can be prevented.

[0008] Figures 5 and 6 relate to the second embodiment, with Figure 5 being a front view of the assembly and Figure 6 being an explanatory diagram of the operation. It is. Figure 5 shows the tightening bolt holes for connecting rod 1 and cap 2 centered at the large end of the rod. It is arranged asymmetrically with respect to the left and right sides. Next, the operation of the second embodiment will be explained. Figure 6 shows connecting rod 1 and cap 2 installed in the opposite direction. The following shows a case where an attempt is made. At this time, connect the bolt hole on the connecting rod side 1 and the cap. Since the centers of the bolt holes on the top side 2 do not match, insert the rod bolt 3 into the bolt hole. This causes the connecting rod 1 and cap 2 to be reversely assembled. is prevented.

[0009]

[Effect of the idea]

This invention is configured as described above, so if there is not enough work space during service. This makes it easier to assemble the connecting rod even when the lighting is poor or there is insufficient lighting. This ensures that the cap is not assembled in reverse, preventing the connecting rod metal from seizing. It is possible to prevent such failures.

[Brief explanation of drawings]

FIG. 1 is an assembly diagram of a connecting rod according to a first embodiment of the present invention.

FIG. 2 is a parts diagram of a connecting rod.

FIG. 3 is a parts diagram of the cap.

FIG. 4 is an explanatory diagram of the operation of the first embodiment of the present invention.

FIG. 5 is an assembly diagram of a connecting rod according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram of the operation of the second embodiment of the present invention.

FIG. 7 is an assembly diagram of a conventional connecting rod.

[Explanation of symbols]

1 Connecting rod 2 Cap 3 Rod bolt 4 Nut 5,6 Rod metal 7 Piston pin bush

Claims (2)

[Scope of utility model registration request] 1. A connecting rod for an internal combustion engine, characterized in that the connecting rod and the cap are each provided with concave and convex portions that engage with each other on the dividing surfaces thereof. 2. A connecting rod for an internal combustion engine, characterized in that bolt holes for tightening the connecting rod and the cap are provided asymmetrically with respect to the center of the connecting rod's large end.