JPS6023670A - Assembly structure of piston and connecting rod of internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve strength by forming a piston pin and a connecting rod in one body and connecting the piston pin to a piston via a bearing with a fitting member. CONSTITUTION:A piston pin 17 is formed on one end of a connecting bar 16 in one body, and a crank pin 19 is fitted to the other end with a fitting member 18. The piston pin 17 is fitted to the fitting hole 15 formed on a skirt 12 and fitting holes 23 of fitting members 22 fixed to the skirt 12 with bolts 21 via a slide bearing 24. The slide bearing 24 has a bearing metal 25 semicircularly formed along the fitting hole 15 and a semi-circular bearing metal 26 provided along the fitting holes 23 of individual fitting members 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston and connecting rod assembly, for example in a diesel rhizosphere.

The piston and connecting rod of an internal combustion engine are subjected to extremely severe conditions from the viewpoint of warping force, as the inertial force is repeatedly exerted when the piston and connecting rod move in the cylinder (71 strokes). The prior art that is placed on the O co-frame is shown in FIG.

A piston pin 3 is inserted into the piston 2, which moves vertically in FIG. A connecting rod 5 is connected to this piston pin 3 via a sliding bearing 4.

At the time of attraction, the piston 2 is moved as shown by t1+ in FIG.
A number of forces, indicated by the reference numeral 6, act on this, whereby the reaction force of the connecting rod 5 is indicated by the reference numeral 7. Also luck with piston 2 and articulation $5! During WJ, piston 2 at top dead center
A reaction force 9 acts on the connecting rod 5 due to the inertial force 8 . In this way, the piston pin 3 bends and becomes stiff. Therefore, 414 scratches on the boss portion where the piston pin 3 is housed are prevented.

The piston pin 3 cannot be made unnecessarily large due to dimensional restrictions on the piston 20. Therefore, the stress on the piston pin 3 increases as the explosion pressure increases or as the inertia force increases when the surface speed rotates. Piston pin 3? -1 Connecting rod 5 to receive load 1i due to inertia force
It is necessary to set a sufficient length A in the 1t11 direction at the top of the slide bearing 4, which is supported by the sliding bearing 4. Therefore, the axial length 2·B of the piston pin 3, by which the piston pin 3 is fixed to the piston 2, cannot be set to a sufficiently large value. Therefore, the blood pressure in the portion of the piston pin 3 over its length 2·B becomes high.

Other prior art forms a concave spherical seat in the piston 2,
A convex spherical part formed on the upper part of the connecting rod 5 is connected to perform angular displacement about the axis of the piston 2, thereby preventing sticking of the piston ring and scuffing of the sliding surface. According to such prior art, the spherical seat of the piston and the spherical part of the connecting rod move while being in direct contact with each other due to blood pressure, and the lubrication conditions are poor, resulting in severe wear and seizure. Also, machining the spherical seat and the connecting rod's ball 1iIII takes time. If a bearing were to be installed between the spherical seat of the piston and the spherical part of the connecting rod, it would be difficult to process the bearing itself, and the bearing metal of the bearing should be placed along the spherical seat of the piston and the spherical part of the connecting rod. It is difficult to have them stay in secret. If such a dense layer is not formed, the bearing will be subjected to repeated loads due to the pressure and inertia within the cylinder, and therefore, for example, the spherical seat of the piston and the surface of the bearing will be undulated, or the back surface of the bearing and the inward direction of the connecting rod. 7 Resetting corrosion may occur during this period, which may cause damage to the piston.

In summary, these prior art techniques have poor reliability in order to achieve high output.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide an internal combustion root zone piston and connecting rod assembly structure with improved reliability.

FIG. 3 is a front view of the present invention, and FIG. 4 shows that IB' seen from the section line IV-IV in FIG.
The figure is a sectional view taken from the line V--■ in FIG. 3, and FIG. 6 is an exploded perspective view thereof. Referring to these drawings, the piston 11 includes a skirt 12 and a top portion Klr of the skirt 12.
! The crown 13 includes a crack 13 that is defined as if, and a pair of hanging pieces 14 extending from the skirt 12 to the side opposite to the crown 13. The raw lower pieces 14 are spaced apart in the circumferential direction, and
In the m example, they are arranged on one diameter line of the piston 11, respectively. A mounting hole 15 having a semicircular cross section perpendicular to the axis is formed in the skirt 12 . A piston pin 17 is integrally formed at one end of the connecting rod 16, and a crank pin 19 is attached to the other end by a mounting member 18. Connecting rod 16, piston pin 17 and e, jf &
It may be constructed integrally by machining or the like, or it may be constructed integrally by bolting, welding, or the like.

A through hole 20 is formed in the piston pin 17 in the axial direction thereof, and light rotation is achieved. The piston pin 17 is
The mounting member 22 is fitted into the mounting hole 15 formed in the skirt 12 and the mounting hole 23 of the mounting member 22 placed in the skirt 12 by the pole 1-21 via a flood bearing 24.

The sliding bearing 24 includes a bearing metal 25 formed in a semicircular arc shape along the mounting hole 15 and a semicircular support metal 26 provided along the mounting hole 23 of each mounting member 22.

The shaft metal 25 is in contact with the half outer peripheral surface of the piston pin 17 on the side opposite to the connecting rod 16, and the 1111 receiving metal 2
6 is the semi-outward direction 01+ of the piston pin 17 on the connecting rod 16 side
, vc contacts.

FIG. 7 is a perspective view of the piston 11 from the lower blade of FIGS. 3 and 4. The bearing metal 25 is identified by a constant piece 29 fixed to the end face of the skirt 12 by a bolt 28 at the location where the connecting rod 16 is located. Lubricating oil is supplied to the bearing 24 through an oil hole 30 inside the piston 11. Such lubricating oil supply routes are well known to those skilled in the art. A threaded hole 31 into which the bolt 21 described above that pushes through the mounting member 22 is screwed is formed at the end ``'' of the skirt 12.

The piston pin 17 is integrally constructed by the connecting rod 16, and the piston pin 17 is sealed to and attached to the piston 11 by the bearing 24, so that the piston pin 17 is sealed to the piston 11 by the bearing 24. strength can be achieved.

FIG. 8 is a cross-sectional view of another embodiment of the present invention, and FIG. 9 is a cross-sectional view of the same as seen from the cutting curve (■--■). This embodiment is similar to the previous embodiment and corresponding parts are provided with the same reference numerals. In this embodiment, the half-lower piece 14a continuous to the skirt 12 is formed over the entire circumference.

FIG. 10 is a sectional view of still another embodiment of the present invention.

Although this embodiment is similar to the embodiments shown in FIGS.
and the mounting member 22 is made of steel. The bold 31 is pushed through the mounting member 22 and the skirt 12 and is screwed into a threaded hole 32 formed in the crown 13.

FIG. 11 is a sectional view of still another embodiment of the present invention.

This embodiment is similar to the embodiment shown in FIGS. 3-7 described above. What should be noted is the piston pin 1 that is integrated into the connecting rod 16.
7a includes a large diameter portion 33 connected to one end of the connecting rod 16, and a support portion [1I34] extending from both ends of the large diameter portion 33 in the axial direction. The large diameter portion 33 is attached to the skirt 12 by a semicircular bearing 35;
Supported by a. The support shaft 34 is attached to the mounting hole 4 of the skirt 12 by means of a mounting member 39 through a bearing 38 including an upper semi-arc-shaped bearing metal 36 and a lower semi-arc-shaped shaft support metal 37.
It is stored in 0. This mounting member 39 is fixed to the end surface of the skirt 12 by bolts 41. According to such an embodiment, since the support shaft 34 has a small diameter, the mounting member 3
9 can be fixed to the skirt 12 using large bolts 41.

With the piston pin and connecting rod as above? - The piston pin is integrally constructed, and the piston pin is connected to the piston by the mounting member through a bearing between the piston pin and the piston and the mounting member, so the piston pin is connected to the piston by the mounting member. Now you can receive it with strength, 4? reliability is improved. In addition, since improving the strength is an i+J function, it becomes possible to reduce the fuel consumption rate after internal combustion, for example, by increasing the kettle pressure in the cylinder.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the prior art, FIG. 2 is a sectional view for explaining the layers acting on the piston pin 3 of the prior art shown in FIG. 1, and FIG. 3 is an embodiment of the present invention. Example front view,
Fig. 4 is a cross-sectional view taken from the green bar 1v in the J section of Fig. 3...Fig. J, Fig. 5 is a cross-sectional view taken from the cut IvT plane 1v-v in Fig. An exploded perspective view of the embodiment shown in FIG.
7 is a perspective view of the piston 11 seen from below in FIGS. 3 and 4, FIG. 8 is a cross-sectional view of another embodiment of the present invention, and FIG. 9 is a cross-sectional view taken along vJ cross-sectional line IX-- Cross-sectional view seen from IX,
FIG. 10 is a sectional view of still another embodiment of the present invention, *s
FIG. 11 is a sectional view of another embodiment of the present invention. 11...Piston, 12...Skirt, 13...
Kurakun, 15.15a, 23.40...Mounting hole, 1
6...Connection '1F-117, 17a-piston pin,
22゜39...Receiving ηS material agent Patent attorney Shikyo Kei Department Figure 6 Figure 7 Figure 8 Figure 97 2 1 ■ 1, 101- Figure 10 Figure 11

Claims (1)

[Claims] The piston pin and connecting rod are integrally constructed, and the piston pin's j! 4! An internal combustion engine characterized in that both outwardly extending portions of the contact rod are connected to the piston by a lx+J section from the connecting rod side to the piston, and a bearing is interposed between the piston pin and the piston pin and the mounting member. Assembly structure of piston and connecting rod.