JPS643844Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a conrod for a V-type engine.

[Prior art]

In general, V-type engines are made to shorten the overall length of the engine and lower its height.
Conventionally, the connecting rod used in this V-type engine has a shape that is symmetrical with respect to a line connecting the center points of the small end of the connecting rod and the large end of the connecting rod.

[Problem that the invention attempts to solve]

However, in the conventional connecting rod structure, the rotation locus of the connecting rod large end 1 is large as shown in FIG.
A problem occurs in that the cylinder skirt 2 interferes with the lower surface 2a of one adjacent cylinder skirt 2 of the V-type engine. Therefore, as a means to avoid this interference, it is conceivable to shorten the cylinder skirt 2 or move the entire cylinder skirt upward, for example. However, the former method has the disadvantage that the piston guide near the bottom dead center of the cylinder skirt 2 becomes smaller and becomes a source of noise such as slapping noise, and the latter method has the disadvantage that the engine size increases. occurs. In addition, in a V-type engine, two connecting rods are pivotally supported on a single crank pin, so it is necessary to ensure sufficient contact surface between the two connecting rods on the sides of the large ends of both conrods, especially on the side surfaces on the rod side. There are restrictions.

[Purpose of invention]

The purpose of the present invention was to solve the above-mentioned disadvantages and limitations, and to avoid generating noise such as slapping noise, and without increasing the size of the engine as a whole, the large end of the conrod is located on the lower surface of one cylinder skirt adjacent to the other. To provide a conrod for a V-type engine which can reliably prevent interference with the engine.

[Means for solving problems]

In order to achieve this purpose, the present invention
A parallel surface portion is provided at the large end of the connecting rod so that it is parallel to the lower surface of one of the adjacent cylinder skirts when the large end portion of the connecting rod comes closest to the lower surface of the adjacent cylinder skirt, and a crank is provided at right angles to the parallel surface portion. It has a structure in which the large end of the connecting rod is divided into two by a plane passing through the center of the pin.

[Embodiments of the invention] The details of the invention will be described below using examples shown in the drawings.

Figure 1 shows a V using the conrod according to the present invention.
FIG.
is a crankshaft, and the large ends 6 of two connecting rods 5 are pivotally supported on one crank pin 4 of the crankshaft in parallel in the axial direction. On the other hand, stove 5
A piston 8 is pivotally supported on the small end 7 of the piston 8 via a bearing metal and a piston pin (not shown). The piston 8 is slidably disposed within the cylinder 9, and the left and right bank pistons 8 are disposed at a predetermined V bank angle. Note that the above structure is the same as before, so
Further detailed explanation will be omitted.

In this embodiment, the large end 6 of the connecting rod 5
The center line 1 that divides the shape of the conrod 5 into left and right sides
The feature is that the shape is not symmetrical with respect to 0, but instead has the following shape. That is, the end surface (parallel surface portion 6a) of the large end 6 of the connecting rod 5 on the side opposite to the adjacent cylinder 9 is connected to the lower surface 9b of the adjacent cylinder skirt 9a.
The cylinder skirt 9a is formed so that it is parallel to the lower surface 9b of the cylinder skirt 9a, and the large end 6 is perpendicular to the parallel surface portion 6a and is aligned with the crank pin 4. Plane 1 passing through center O
It has a structure in which it is divided into two parts (indicated by reference numerals 6b and 6c).

Therefore, if the connecting rod structure is adopted as described above, as shown in FIG. Even when the portion 6 approaches the lower surface 9b of the adjacent cylinder skirt 9a again, as indicated by the reference numeral 6' in FIG. 2, the large end portion 6' will not interfere with the lower surface 9b of the cylinder skirt 9a. can now be reliably prevented. Therefore, there is no need to shorten the length of the cylinder skirt 9a or move the entire cylinder 9 rearward as in the past, and this allows the piston to move around the bottom dead center of the cylinder skirt 9a. The guide can now be used as before, which not only prevents noise such as slapping noise, but also makes the engine smaller (more precisely, shortens the length in the cylinder direction), which has various excellent effects. . In addition, a sufficient contact surface between the two stove rods can be secured on the side surface of the large end on the rod side. In addition, in FIG. 2, the reference numeral 12 is a stroke circle.

In addition, in the above-mentioned embodiment, only a V-type engine using one crank pin was described, but
It goes without saying that the present invention is not limited to this, and can also be applied to the structure of a so-called two-crank pin type V-type engine that uses two crank pins.

[Effect of idea]

As explained above, according to the conrod for a V-type engine according to the present invention, when the conrod is operated, the large end of the conrod can be prevented from interfering with the lower surface of the adjacent cylinder skirt. This provides various excellent effects such as being able to provide a sufficient length of the piston guide near the bottom dead center and also reducing the engine dimensions in the longitudinal direction of the cylinder.

[Brief explanation of the drawing]

Figure 1 shows a V using the conrod according to the present invention.
FIG. 2 is a skeletal diagram of the V-type engine shown in FIG. 1, and FIG. 3 is a skeletal diagram of a conventional V-type engine. 3... Crankshaft, 4... Crank pin, 5... Conrod, 6... Big end, 6a... Parallel surface part, 9... Cylinder, 9a... Cylinder skirt, 9b... Bottom surface, 1
1...Plane.

Claims (1)

[Scope of utility model registration request] A parallel surface portion is provided at the large end of the connecting rod, and the parallel surface portion is formed to be parallel to the lower surface of one of the adjacent cylinder skirts when the large end portion of the connecting rod comes closest to the lower surface of the adjacent cylinder skirt, and the parallel surface portion is perpendicular to the parallel surface portion. A conrod for a V-type engine characterized by a structure in which the large end of the conrod is divided into two by a plane passing through the center of the crank pin.