JPH0249959A - V-engine reinforcing structure for racer - Google Patents

Abstract

PURPOSE:To improve the torsional rigidity of an engine with simplified constitution by protrusively providing ribs in a longitudinal direction in right and left outer surfaces of a cylinder block while forming one part of the rib by a water pipe connecting a water jacket to a water pump. CONSTITUTION:A V-engine 7 forms its cylinder block 7a by right and left cylinder rows 7L, 7R and a bottom crankcase part 7U connecting these cylinder rows. Each cylinder row 7L, 7R is respectively formed by cylinders 7e partitioning a combustion chamber and by water jackets 7f provided to be arranged in outer surfaces of these cylinders. While the engine protrusively provides reinforcing walls 7h in a crankshaft direction in an outer wall of the water jacket 7f while partitions water passages 7j by partly increasing a sectional area. In this way, when bending force acts on the cylinder block 7a, the engine is suppressed from its deformation by the reinforcing wall 7h, reducing an output loss.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an automobile that uses an engine as a constituent member of the vehicle body, such as a racing automobile.
In particular, the present invention relates to an improvement in an automobile in which a front portion of a vehicle body mainly made of synthetic resin supported by front wheels and a power transmission unit supported by rear wheels are connected via an engine.

[Conventional technology]

Conventionally, as shown in Figure 3, the body of a road racing car is made of synthetic resin at the front and a power transmission unit (22) 7 including the engine at the rear, which is connected to a bracket 6.
．． 6, they are connected so as to be separable and connectable. Therefore, shocks such as bending and twisting are applied from the ground to the engine through the front and rear wheels 2 and 4, and the magnitude of the impact is a gravitational acceleration of 5G or more. This distorts the engine block, increases friction in bearings and sliding parts, and causes problems that reduce maximum output.

[Problem to be solved by the invention]

Therefore, the engine is generally designed with a ■-shaped structure so that it can withstand not only the power it generates but also the impact applied from the ground.
Although the engine is mounted with the axis of the crankshaft facing forward and backward, it is not sufficient, and it becomes necessary to increase the wall thickness of the engine case, and in some cases, it becomes necessary to install ribs on the outer surface of the engine, resulting in an unnecessary increase in weight. It's inviting. Further, in order to increase resistance to bending force, the angle between the left and right cylinder rows, the so-called bank angle, is sometimes set to be smaller than 90 degrees, but the effect is significantly reduced when torsional force acts on the engine.

[Means to solve the problem]

The purpose of this invention is to eliminate the above-mentioned problems and improve the torsional rigidity of an engine with a simple structure by utilizing essential parts and structures that are essentially required. In a competition car in which a power transmission unit supported by the front and rear wheels is connected in the front and back, and the crankshaft of a V-shaped engine constituting the power transmission unit is mounted with the crankshaft facing in the front-rear direction, the cylinder block of the engine is Consisting of left and right cylinder rows and a lower crankcase that connects them, ribs are provided in the front and rear directions on the left and right outer surfaces of the cylinder block, and a portion of the ribs are connected to a water jacket and a water pump. It is unique in that it is constructed with an integrally cast water pipe.

[Effect]

The cylinder block is reinforced by longitudinal ribs provided on the left and right outer surfaces, increasing torsional rigidity.

Further, a part of the rib is constituted by an integrally cast engine cooling water water pipe, and a part of the cylinder block is reinforced by the water pipe.

〔Example〕

Hereinafter, the present invention will be explained with reference to the illustrated embodiment. In the figure, 1 is a competition car, and a plurality of power transmission units 5 are connected to each other. The front and rear parts are connected via a bracket 6.6.

That is, the front part 3 of the vehicle body is made of fiber-reinforced plastic, and is provided with front stabilizing wings 3a at the front and a driver's seat 3b at the rear.

The power transmission unit 5 consists of a V-shaped engine 7 placed at the front and a transmission 8 consisting of a transmission/differential placed at the rear. It is a stabilizing wing and is attached to the rear of the power transmission unit 5 to generate downward lift, so-called downforce, when the vehicle is running.

As shown in FIG. 2, the V carver/gin T has left and right cylinder/cylinder rows 7L and 7R, and is mounted with the crankshaft hole 7k facing in the front-rear direction. A cylinder block 7a constituting the engine γ is connected with a cylinder head 7b on the upper side and an oil pan 7C on the lower side, as in the conventional case. 7
d indicates a horn portion of the intake pipe that projects upward from the head 7b.

The cylinder block γa is made by casting aluminum alloy, and as shown in FIGS. 1 and 2, the left and right cylinder rows 7L
, 7R and a lower crankcase portion 7U that connects them. Each cylinder row 7L, 7R is composed of a cylinder hole 7e constituting a combustion chamber and a well-known water jacket 7f formed on its outer surface. A reinforcing wall 7h is provided in a protruding manner, and the cross-sectional area of a portion of the reinforcing wall 7h is increased, and a water passage 7j is bored inside.

When the competition car 1 configured as described above is subjected to a shock from the ground while running, and the shock is applied simultaneously to both the left and right wheels of the front and rear wheels 2 and 4, such as during braking, K is the V-shaped engine γ. A simple bending force as shown by arrow A in FIGS. 3 and 4 acts on the vehicle, and a torsion force B acts on the vehicle when turning or when only one of the left and right wheels 2.4 passes through a convex portion on the ground.

When a bending force acts on the cylinder block 7a in this way, in the conventional cylinder block Ta itself bends, and at the same time, the cylinder row 7R also bends.

7L tends to open and cause unnecessary friction with the internal shaft, piston, and other parts, but according to the present invention, the bending force acting on the cylinder block 7a is absorbed by the bending force formed on the outer surface of the cylinder block 7a. As a result of this, the deformation of the reinforcing wall 7h is reduced, so that no deformation is applied to the internal shaft or bearing, and no increase in frictional resistance occurs.

〔Effect of the invention〕

As described above, in a competition automobile in which the engine is a structural member of the vehicle body, when the vehicle is running,
Even if a strong bending force is applied to the cylinder block 7a due to irregularities on the ground, deformation is prevented by the reinforcing wall 7h protruding from the outer surface of the cylinder block 7a parallel to the crankshaft, and deformation of the engine is suppressed to a minimum. output loss can be reduced. Further, since the reinforcing wall 7h for preventing the deformation also serves as a water passage to the water jacket 7f, the structure can be simplified.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a bottom view of a cylinder block, FIG. 2 is a sectional view taken along the line ■n, and FIG. 3 is a side view of a competition car. Bottle/power transmission unit, 6, 6... Association racket, 7a Threat/fist/cylinder block, 7b, -
・-Cylinder head, 7C11...Oil pan, 7h
...Reinforced wall. Patent applicant Yamaha Motor Co., Ltd. Figure 1 7 and Figure 2

Claims (1)

[Claims] A competition in which the front part of the vehicle body supported by the front wheels and the power transmission unit supported by the rear wheels are connected front to back, and the crankshaft of the V-shaped engine forming the power transmission unit is mounted with the crankshaft facing in the front-rear direction. In a commercial vehicle, the cylinder block of the engine is composed of left and right cylinder rows and a lower crankcase that connects the two, and ribs are provided on the left and right outer surfaces of the cylinder block in a longitudinal direction, and one of the ribs is provided with a longitudinal rib. A V-shaped engine reinforcement structure consisting of an integrally cast water pipe to connect the water jacket and water pump.