JPS6030488Y2 - Connecting rods for internal combustion engines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a connecting rod for an internal combustion engine.

Connecting rods in internal combustion engines have oil holes drilled from the large end sliding surface through the arms to the small end, and the oil that has lubricated the large end is sent through the oil holes to the small end, so that the small end can also be lubricated. ing.

This oil hole must be drilled in the long arm of the connecting rod using a thin drill, which takes time and effort.

In addition, since the drill is thin, it may break during work, resulting in long work time, poor productivity, and high costs.

In view of these points, this invention has been improved so that it can be manufactured at high productivity and at low cost.The embodiments of this invention shown in the drawings will be described below.

Arm portion 3 connecting the large end 1 and small end 2 of the connecting rod
A concave portion is provided on one side of the arm portion 3, and the cross section of the arm portion 3 is formed into a substantially concave shape.

Then, a stepped pipe hole 5 is bored at the big end 1, and a pipe hole 6 is bored at the small end 2 as well.

Then, the oil pipe 7 is inserted through the pipe hole 5 of the large end 1, and the oil pipe 7 is inserted through the recess 4 of the arm portion 3 to the pipe hole 6 of the small end 2.

The end portion of the oil pipe 7 on the side of the large end 1 is widened to a large diameter, and the stepped portion of the pipe hole 5 will be described.

The oil that has lubricated the big end 1 flows through the oil pipe 7 to the small end 2 and lubricates the small end.

-The pipe holes 5 and 6 can be formed by drilling short holes at the large end 1 and the small end 2, and since the two pipe holes 5 and 6 are connected by the inserted oil pipe 7, the pipe holes 5 and , 6 can be done in a short time using a short drill, and since the drill is short, it is less likely to break.

As explained above, this invention provides a concave portion on one side of the arm connecting the large and small ends of the connecting rod to form a concave cross-section, and a pipe hole is formed at each of the large and small ends. Since the oil pipe was inserted from the large end pipe hole through the recess to the small end pipe hole, the large end pipe hole and the small end pipe hole were connected with the oil pipe passed through the recess in the arm. Lubricating oil can be passed through to the small end.

Pipe holes can be drilled separately at the big end and small end, and the drilling work can be done with a short drill, resulting in short machining time and high productivity. This makes it difficult to break, and it can be cut at high speed, resulting in a significant reduction in processing costs.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is an enlarged cross-sectional view taken along arrow A-A in Fig. 1, and Fig. 3 is an enlarged longitudinal cross-section taken along arrow C in Fig. 1. FIG. 4 is an enlarged longitudinal cross-sectional view of the section shown by arrow C in FIG. 1. 1...Large end, 2...Small end, 3...Arm, 4...Recess, 5...Pipe hole, 6 ...Pipe hole, 7... Oil pipe.

Claims (1)

[Scope of utility model registration request] A recess is provided at one end of the arm that connects the large and small ends of the connecting rod to form a concave cross-section, and a pipe hole is provided at each of the large and small ends, allowing the oil pipe to be inserted through the pipe hole at the large end. A connecting rod for an internal combustion engine, characterized in that it is inserted through a recess to a pipe hole at the small end.