JPS5999107A - Connecting rod made of compound material - Google Patents

Abstract

PURPOSE:To improve the reliability of a connecting rod in terms of strength as well as to aim at the promotion of its lightweightiness, by coupling a big end and a cap part of the connecting rod after being clamped tight with a U- shaped metal device. CONSTITUTION:A big end 4 is installed in one end of a connecting rod 1, while a cap 5 is connected it together with this big end 4 via both of a crankshaft 6 and a metal 7, and outer surfaces of both flange parts 9 and 10 of the big end 4 and the cap 5 are provided with each of thick sloping surfaces 13 and 14 at the end part side. The tip of a machine bolt 16 being set in a tapped hole bored in and around the cap side of a U-shaped clamping metal device 15 which nippingly holds these flange parts 9 and 10 fitted in these sloping surfaces 13 and 14 is pushed against the sloping surface 14 of the cap 5 via a keep piece 18. With this, a contact area between these flange parts 9 and 10 and the camping metal device 15 can be made to be yet wider owing to the formation of these sloping surfaces 13 and 14, so that compression stress and creep both can be made smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connecting rod made of composite material.

Conventionally, there have been connecting rods of this type as shown in FIGS. 1 to 3. In the figure, l is a rod body made of iron, and a small end 2 connected to a piston pin 3 is provided at one end of the rod body. Numeral 4 is a big end provided at the other end of the rod body l, 5e is a cap that is connected to the crankshaft 6 together with the big end 4, and 7 is metal. 8
is big x y)"4,': #Gip 5 is tightened with bolts 11 that pass through holes 9a and 10a drilled in the respective flanges 9 and 10.

The connecting rod configured in this way receives the explosive force of the piston and connects the piston pin 3 and the crank ll'116.
Since the rod body 1 receives compressive force using the fulcrum, the body 1
The connecting rod must have sufficient strength and shape to withstand buckling force, and the piston reciprocates 2,000 to 5,000 times per N minute to rotate the crank, so the connecting rod reciprocates with the small end 2 and the big end 4. A rotational force is generated and the bolt 8 is transmitted to rotate the big end 4 and the cap 5. For this reason, the small end 2 generates bending stress due to inertia due to the reciprocating motion of the piston and piston pin, and requires sufficient strength at point A. Bending stress is generated due to inertia force or inertia force due to rotational movement, and the stress is particularly large at point B, cap 5, HC, point D, and bolt 8, so it was necessary to increase the rigidity of the shape. Therefore, conventional connecting rods are forged from carbon steel in order to withstand the above stress, but they are heavy and have a large inertial force, making the balance weight of the crank too heavy, and therefore requiring a large amount of driving energy.

Therefore, it is necessary to reduce the weight of the connecting rod, but if the connecting rod has a conventional structure made of fiber-reinforced composite material such as fiber-reinforced plastic, the flange portions 9 and 10 of the big end 4 and the cap 5 will have a diameter of 8 to
If holes 9g and 10a of 12 tags were made, continuous fibers would have to be cut, which had the disadvantage that cutting would result in a decrease in strength.

This invention was made in order to eliminate the drawbacks of the conventional products as described above, and the flange portion of the big end and the cap is clamped with a U-shaped fastening metal fitting, and the flange is fixed with a push bolt screwed into the fastening metal fitting. The purpose of the present invention is to provide a connecting rod made of a composite material that can be pressed against a surface to connect a big end and a cap, thereby increasing reliability in terms of strength and reducing weight.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 4 to 6, l is a rod body, and a small end 2 is provided at one end to be connected to a piston pin 3 via a metal 12. 4 is a big end provided at the other end of the rod body l; 5 is a crankshaft 6 along with the big end 4;
The cap is connected to the big end 4 and the cap 5 through the metal 7, and the respective flange parts 9 and 10 of the big end 4 and the cap 5 are connected to each other via the metal 7.
IrJ, whose outer surface is a thick slope on the end side 13.14
has been established. 1511 The flange portion 9.fits into this slope 13.14. The U-shaped fastener 16 that holds the lO is a push bolt that is screwed into a screw hole 17 on the cap 5 side of the fastener 15.
The tip of the bolt 6 is pressed against the slope 14 of the cap 5 via a presser piece 18.

The connecting rod configured as described above can be connected to the big end 4 and the character 7 by tightening the pushing bolt 16.
65 can be firmly integrated and connected, there is no reduction in strength compared to the conventional case in which the big end and the flange part of the cap are provided with a hole for passing through the bolt.

In addition, slopes 13.1 provided on the outer surfaces of the flange portions 9 and 10
Since the fastening metal fitting 15 is installed so as to fit into 4,
The fastening fitting 15 will not come off during rotation of the crankshaft 6. Furthermore, the slope 13. '14, the flange portion 9. Since the contact area between lO and the fastener 15 can be increased, compressive stress can be reduced and creep can be reduced.

In the embodiment, the push bolt 16 is screwed in from the cap 5 side, but the push bolt 16 may be screwed in from the bi-end 4 side. Further, the contact surface of the flange portion 9.10 with the fastening fitting 15 may be a stepped portion, a curved surface, etc. other than the slope.

In addition, as shown in FIGS. 7 and 8, the fastening fitting t and the flange portion 9. By configuring the fastening fitting 19 of the housing that encloses the lO, it is possible to prevent the fastening fitting from shifting in the thickness direction of the flange portion. Further, as another embodiment on the upper side, as shown in Fig. 9, an engaging part 20 consisting of a recess crossing these parts is provided on the side end face of the 7 run part 9 and 100, and a fastening metal fitting 15 is provided in this retaining part.
The fitting part 21 consisting of a convex part provided in the first
On the contrary, as shown in Figure 0, the 7 rung section 9. The same effect as described above can be obtained by providing a convex retaining portion 20a on the lO and fitting the concave fitting portion 21a provided on the fastening fitting 15 into this engaging portion.

As described above, according to the present invention, the seven rung portions of the big end and the cap are held together by the U-shaped fastening metal fittings, and the flange surfaces are pressed against each other by the pusher delts screwed into the fastening metal fittings. By combining the cap with the cap, it is possible to achieve high reliability in terms of strength and weight reduction, thereby saving driving energy.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional connecting rod, Figure 2 is a side view, Figure 3 is a sectional view showing the connection between the big end and the cap, and Figure 4 is a front view of the connecting rod of the present invention. Figure 5 is a side view, and Figure 6 is a cross-sectional view of the big end and cap connected with a fastening fitting.
Fig. 7 is a sectional view showing another embodiment of the fastening fitting, Fig. 8 is a sectional view taken along the line X-X of Fig. 7, and Figs. 9 and 10 are partially cutaway perspective views showing other embodiments. be. l...Rod body, 2...Small end, 4...
・Big end, 5... Cap, 9. lO...7
Lang part, 13.14... Inclined surface, 15.19... Fastening metal fitting, 16... Push delt, 17... Screw hole, 1
8... Pressing piece, 20... Engaging portion, 21, 21a...
·Fitting portion. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 □□□□□□ Figure 3
If Figure 5 Figure 6 1o 18 1? 16 Figure 7 Figure 8 Figure 9 ? ,',S 9Figure 8-

Claims (1)

[Scope of Claims] (1) A connecting rod in which a small end connected to a piston pin is provided at one end of the rod body, and a big end provided at the other end and a divided cap are connected to the crankshaft. Clamp the outer surfaces of both the end and the cap with the U-shaped fastening metal fittings, insert the push bolt '(I-screw) into the screw hole provided on one side of the fastening metal fitting, and insert the bolt tip of this push bolt into the flange surface. A connecting rod made of composite feathers, characterized in that the big end and the cap are pressed against each other. (2) The tip of the bolt is pressed against the outer surface of the 7 langes via a pressing piece overlapped with the other. A connecting rod made of a composite material according to claim 1, characterized in that: (3) the fastening fitting is made of a housing that encloses the big end and the seven rungs of the cap; A connecting rod made of a composite material according to claim 1. (The outer surface of the pulling big end and the seven flange of the cap has a thick contact surface on the end side, and a fastening fitting is fitted into this contact surface. A connecting rod made of a composite material according to claim 1. (5) A retainer formed of a recess or a convex portion that crosses the big end and the cap on the end face of the seventh rung side of the big end and the cap. A connecting rod made of a composite material according to claim 1, characterized in that a fitting portion is provided, and a fitting portion that fits into the fitting portion is provided on the fastening metal fitting.