JP2008215373A - Connecting rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting rod capable of increasing a supply quantity of lubricating oil via a lubricating oil hole, without expanding a diameter of the lubricating oil hole formed in a small end part of the connecting rod. <P>SOLUTION: This connecting rod has a lubricating oil collecting mechanism constituted for holding the lubricating oil sticking to an upper side outer peripheral surface 21 of the small end part 20 and introducing the lubricating oil held in response to lowering of the small end part 20 to the lubricating oil hole 23. The lubricating oil collecting mechanism includes a plurality of strips of oil grooves 30 formed toward the lubricating oil hole 23 on the upper side outer peripheral surface 21 of the small end part 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connecting rod in an internal combustion engine.

The connecting rod, which is a part for converting the reciprocating motion of the piston of the internal combustion engine into the rotational motion of the crankshaft, causes seizure when the supply amount of the lubricating oil to the piston pin insertion hole through which the piston pin is inserted is insufficient. there is a possibility.
In Patent Documents 1 to 3, a lubricating oil hole communicating with a piston pin insertion hole is formed in a small end portion of a connecting rod, and lubricant oil or a piston ceiling surface is directly scattered through the lubricating oil hole. A technique for supplying dripped lubricating oil to the piston pin side is disclosed.
JP 2000-240421 A Japanese Utility Model Publication No. 5-12612 Japanese Utility Model Publication No. 58-67115

By the way, in order to sufficiently supply the lubricating oil splashed directly to the small end and the lubricating oil dropped from the back surface (ceiling surface) of the piston to the piston pin side, it is necessary to make the diameter of the lubricating oil hole as large as possible. .
However, since the strength of the small end portion decreases when the diameter of the lubricating oil hole is increased, there is a restriction on increasing the diameter of the lubricating oil hole.

  The present invention has been made in view of the above circumstances, and its object is to lubricate through the lubricating oil hole without increasing the diameter of the lubricating oil hole formed in the small end portion of the connecting rod. An object of the present invention is to provide a connecting rod capable of increasing the supply amount of oil.

The connecting rod according to the present invention is a connecting rod in which a lubricating oil hole communicating with a piston pin insertion hole is formed in a small end portion, holds lubricating oil adhering to the upper outer peripheral surface of the small end portion, and A lubricating oil collecting mechanism configured to guide the retained lubricating oil to the lubricating oil hole as the small end portion is lowered is provided.
According to this configuration, the lubricating oil adhering to the small end portion is retained, and in the process in which the small end portion descends from the top dead center toward the bottom dead center, the retained lubricating oil moves the upper outer peripheral surface by inertial force. It is guided to the lubricating oil hole.

The said structure WHEREIN: The said lubricating oil collection mechanism can employ | adopt the structure containing the multiple groove | channel groove | channel formed toward the said lubricating oil hole in the upper outer peripheral surface of the said small end part.
According to this configuration, the lubricating oil is held by the oil groove formed on the upper outer peripheral surface of the small end, and the oil groove is formed toward the lubricating oil hole, so that the lubricating oil is guided to the oil groove. Supplied to the lubricating oil hole by inertia force.

The said structure WHEREIN: The said lubricating oil collection mechanism can employ | adopt the structure which is provided around the said lubricating oil hole of the upper outer peripheral surface of the said small edge part, and contains the porous material which osmose | permeates and holds lubricating oil.
According to this configuration, the lubricating oil is infiltrated and retained by the porous material, and the retained lubricating oil moves through the porous material by the inertial force and is guided to the lubricating oil hole.

  According to the present invention, it is possible to increase the supply amount of the lubricating oil through the lubricating oil hole without increasing the diameter of the lubricating oil hole formed in the small end portion of the connecting rod.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 3 are views showing a connecting rod according to a first embodiment of the present invention. FIG. 1 is an overall view of the connecting rod, FIG. 2 is a view of a small end portion as viewed from above, and FIG. 3 is a figure for demonstrating the effect | action of a lubricating oil collection mechanism.
As shown in FIG. 1, the connecting rod 10 includes a small end portion 20 on which a piston pin insertion hole 22 into which a piston pin (not shown) is inserted is formed on the upper end side, and a large end portion on the lower end side. 50, a collar portion 60 that connects the small end portion 20 and the large end portion 50, and the like.

  As shown in FIG. 1, the small end portion 20 has a lubricating oil hole 23 formed in a top portion thereof that leads to a piston pin insertion hole 22, and an upper outer peripheral surface 21 that is curved in an arc shape has a lubricating oil collecting portion. An oil groove 30 as a mechanism is formed.

  The lubricating oil hole 23 is formed, for example, to supply lubricating oil that is sprayed and dropped from an unillustrated oil jet or the like toward the piston back surface to the piston pin insertion hole 22 side.

  As shown in FIG. 2, a plurality of oil grooves 30 are formed along the circumferential direction of the upper outer peripheral surface 21, and the front ends of the oil grooves 30 are formed toward the lubricating oil holes 23, and lubrication is performed. It is connected to the oil hole 23, and the rear end portion of each oil groove 30 terminates on the upper outer peripheral surface 21.

In the connecting rod 10 having the above-described configuration, when lubricating oil is scattered or dripped onto the upper outer peripheral surface 21 of the small end portion 20, as shown in FIG. 3, a plurality of oil grooves 30 serve as an oil reservoir. Hold the lubricating oil OL.
When the piston PS in the cylinder CL is lowered from the top dead center toward the bottom dead center, and the small end portion 20 is lowered in the downward direction D1, the lubricating oil OL held in each oil groove 30 is reached. Moves toward the lubricating oil hole 23 due to inertial force. That is, the lubricating oil OL adhering to the upper outer peripheral surface 21 of the small end portion 20 is efficiently collected toward the lubricating oil hole 23 as the small end portion 20 descends, and a sufficient amount of the lubricating oil OL is collected. It can be supplied to the piston pin insertion hole 22 side through the hole 23. As a result, a sufficient amount of lubricating oil can be supplied to the piston pin insertion hole 22 side while suppressing expansion of the lubricating oil hole 23. In addition, since a sufficient amount of lubricating oil can be supplied to the piston pin insertion hole 22 side, the diameter of the lubricating oil hole 23 can be kept relatively small, and the strength of the small end portion 20 can be sufficiently ensured.

4 to 6 are views showing a connecting rod according to a second embodiment of the present invention. FIG. 4 is an enlarged view of a small end portion of the connecting rod, and FIG. 5 is a view of the small end portion from above. FIG. And FIG. 6 is a figure for demonstrating the effect | action of a lubricating oil collection mechanism.
4 to 6, the same reference numerals are used for the same components as those of the connecting rod according to the first embodiment.

As shown in FIGS. 4 and 5, the connecting rod 10A is provided with a porous material 100 as a lubricating oil collecting mechanism in an arc shape on the upper outer peripheral surface 21A of the small end portion 20A. It arrange | positions so that the circumference | surroundings of the oil hole 23 may be enclosed.
The porous material 100 is made of, for example, a foam material obtained by foaming a metal such as aluminum or iron or ceramics. The porous material 100 has a function of permeating the lubricating oil and retaining the lubricating oil, and the permeated lubricating oil can move through the porous material 100.
Further, the porous material 100 has a tapered hole 101 communicating with the lubricating oil hole 23. The tapered hole 101 makes it easy to guide the scattered or dropped lubricating oil to the lubricating oil hole 23.

  The method for attaching the porous material 100 to the connecting rod 10A will be described. The connecting rod 10A in a state where the porous material 100 is not attached is accommodated in a mold having a predetermined shape and corresponds to the upper outer peripheral surface 21A in the mold. A material containing a foaming agent for forming the porous material 100 is filled in a portion to be made. When the mold is heated in this state to foam the foaming agent, the porous material 100 is formed and the porous material 100 is bonded to the upper outer peripheral surface 21A. In addition to this method, the porous material 100 can be bonded to the upper outer peripheral surface 21A using a heat-resistant adhesive.

In the connecting rod 10A having the above-described configuration, when the lubricating oil is scattered or dropped onto the small end portion 20A, the lubricating oil OL is infiltrated and held in the porous material 100 as shown in FIG.
When the piston PS reciprocates in the cylinder CL from the state in which the lubricating oil OL is infiltrated and held in the porous material 100, the small end portion 20A descends in the downward direction D1, and the entire porous material 100 is infiltrated and retained. The lubricating oil OL moves in the porous material 100 toward the lubricating oil hole 23 side by inertia force.

That is, the lubricating oil OL permeated and held in the porous material 100 is guided from both sides of the lubricating oil hole 23 toward the lubricating oil hole 23. As a result, a sufficient amount of lubricating oil OL is supplied to the piston pin insertion hole 22 side through the lubricating oil hole 23. As a result, a sufficient amount of lubricating oil OL can be supplied to the piston pin insertion hole 22 side without increasing the diameter of the lubricating oil hole 23.
In the present embodiment, since the porous material 100 is directly provided on the small end portion 20A, the porous material 100 has a very large surface area. Therefore, the connecting rod can be efficiently dissipated by the heat from the piston PS. A cooling effect of 10A can also be expected.

  In the second embodiment described above, the case where the lubricating oil collecting mechanism is formed of a porous material has been described. However, the present invention is not limited to this, for example, the oil described in the first embodiment. Grooves are formed in the upper outer peripheral surface 21, and the porous material 100 is provided on the upper outer peripheral surface 21, whereby the lubricating oil OL permeated and held in the porous material 100 is more efficiently guided to the lubricating oil holes 23. Is possible.

  In the first embodiment described above, the case where the lubricating oil collecting mechanism is formed by a plurality of oil grooves has been described, but is not limited thereto, for example, a plurality of concave oil sumps are formed, It is also possible to form an oil passage for guiding the lubricating oil held in these oil sumps to the lubricating oil hole 23.

1 is an overall view of a connecting rod according to a first embodiment of the present invention. It is the figure which looked at the small end part of the connecting rod of FIG. 1 from upper direction. It is a figure for demonstrating the effect | action of a lubricating oil collection mechanism. It is an enlarged view of the small end part of the connecting rod which concerns on the 2nd Embodiment of this invention. It is the figure which looked at the small end part of the connecting rod of FIG. 4 from upper direction. It is a figure for demonstrating the effect | action of a lubricating oil collection mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10A ... Connecting rod 20, 20A ... Small end part 21, 21A ... Upper outer peripheral surface 22 ... Piston pin insertion hole 23 ... Lubricating oil hole 100 ... Porous material 101 ... Taper hole PS ... Piston CL ... Cylinder OL ... Lubricating oil

Claims (3)

A connecting rod having a lubricating oil hole formed in the small end portion leading to the piston pin insertion hole,
A lubricating oil collecting mechanism configured to hold the lubricating oil adhering to the upper outer peripheral surface of the small end portion and to guide the held lubricating oil to the lubricating oil hole as the small end portion is lowered. A connecting rod characterized by comprising:   2. The connecting rod according to claim 1, wherein the lubricating oil collecting mechanism includes a plurality of oil grooves formed on the upper outer peripheral surface of the small end portion toward the lubricating oil hole.   The said lubricating oil collection mechanism is provided in the circumference | surroundings of the said lubricating oil hole of the upper outer peripheral surface of the said small edge part, and contains the porous material which permeate | retains and retains lubricating oil, The Claim 1 or 2 characterized by the above-mentioned. Connecting rod as described.

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