JPH0245618A - V-type engine structure for racing automobile - Google Patents

Abstract

PURPOSE:To increase rigidity of a crank case by providing a projecting wall in a crank shaft direction on a crank case, while providing connection between right/left cylinder lines with a connecting wall. CONSTITUTION:The crank shaft of a V-type engine 7 is installed in the longitudinal direction of a vehicle. A projecting wall 7p is projected in the crank shaft direction on a crank case 7a, while providing connection between right/left cylinder lines 7R, and 7L with a connecting wall 7c. A modulus of section is thus increased, while rigidity can be increased against the bending power in the vertical direction or twisting power.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention relates to an automobile that uses an engine as a structural 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]

Generally, as shown in Figure 1, a competition car for road racing has a front body made of synthetic resin that is supported by the front wheels, and a power transmission unit that includes an engine that is supported by the rear wheels and is supported by multiple brackets at the rear. They are connected to each other so that they can be separated and connected at will. And, especially for those that require large output,
V-type engines are often used, with the crankshaft axis facing forward and backward.

[Problem to be solved by the invention]

In this way, in a vehicle in which the V-type engine itself is used as a structural member of the vehicle body, when the shock S applied from the ground acts on both the front and rear left and right wheels at the same time, a vertical bending force acts on the engine, causing the left and right rear wheels to bend. When this occurs, the torsion acts on the engine, causing distortion of the engine case, which increases the frictional resistance between the crankshaft, camshaft, or piston, and not only reduces the engine output. Depending on the conditions, problems such as seizure of sliding parts may occur.

[Means to solve the problem]

The purpose of this invention is to eliminate the above-mentioned problems and improve the rigidity of the engine with a simple structure. In a competition vehicle, the V-shaped engine constituting the power transmission unit is mounted with the crankshaft facing in the front-rear direction, and the cylinder block of the engine is connected to the left and right cylinder rows and a lower crankcase connecting the two. The engine is characterized in that a projecting wall in the crankshaft direction is provided on the crankcase, and the left and right cylinder rows are connected by a connecting wall.

[Effect]

The cylinder block of the V-type engine, which forms the power transmission unit, has a large section modulus due to the protruding wall in the direction of the crankshaft and the connecting wall that connects the top of the wall between the left and right cylinder rows. In contrast, the stiffness increases.

〔Example〕

Hereinafter, the present invention will be explained with reference to the illustrated embodiment. In the figure, 1 is a racing car, and has a front body 3 supported by front wheels 2 and a plurality of power transmission units 5 supported by rear wheels 4. It is connected to the front and back via the bracket 6.6.

That is, the front part 3 of the vehicle body is made of fiber-reinforced glass, 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 is comprised of a V-shaped engine T disposed at the front and a transmission 8 consisting of a transmission/differential disposed at the rear, and is supported by the rear wheels 4.

The V-type engine 1 has left and right cylinder rows γR and 7L, is mounted with a crankshaft (not shown) facing in the front-rear direction, and has a cylinder head 7b on the upper side of the cylinder block γ& and a cylinder head 7b on the lower side. It is constructed by combining an oil pan 7c. In FIG. 1, 7d indicates the upper end of the intake pipe that projects upward from the cylinder head γb.

The cylinder block T1 is made of aluminum alloy, and has a cylinder hole B as shown in FIGS. 2 and 3.
It is composed of left and right cylinder rows 7RS7L forming a left and right cylinder row, and a lower crankcase portion TU that connects the two. A projecting wall 7P extending vertically in the crankshaft direction is provided on the crankcase portion TU, and the top of the projecting wall TP is connected to a connecting wall 70 extending left and right, and the connecting wall r
Both ends of the cylinder are connected to left and right cylinder rows 7R and 7L by casting.

Reference numeral 9 denotes a rear stabilizing wing for increasing the load on the rear wheels 4, which generates downward lift, or so-called downforce, when the vehicle is running.

In the competition car IK configured as described above, when an impact is applied from the ground while driving, and when that impact simultaneously acts on both the left and right wheels of the front and rear wheels 2.4, such as during braking, K is applied to the V-shaped engine T. A simple bending force acts, and an elastic force acts when turning or when only the left or right wheel 2.4 passes over a convex portion on the ground.

When the cylinder block 7aK bending force acts in this manner, in the conventional cylinder block 7a itself bends, and at the same time, the cylinder row 7R.

There is a tendency for the TL portion 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 supported by the piston wall 7PK. The song alleviates the shi. In addition, since the left and right cylinder rows 7R and 7L are connected multiple times by the connecting wall IC, they are prevented from opening even when subjected to twisting or bending.

As a result, deformation of the engine is minimized and an increase in friction is suppressed.

〔Effect of the invention〕

As described above, this invention provides a competition vehicle in which one engine is a constituent member of the vehicle body, when the vehicle is running.
Even if a strong bending force is applied to the cylinder block 7m due to unevenness on the ground, the cylinder block 7m will not be deformed because it is reinforced by the projecting wall TP protruding in the direction of the crankshaft. 9. Left and right cylinder rows 7R.

Since the TLs are connected by the connecting wall TC, it is difficult to open left and right, and as a result of preventing the deformation, the deformation of the engine is suppressed to a minimum, which has the effect of reducing the loss of output.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the parent car, Fig. tJ2 is an external view showing the main parts of the engine, and Fig. 3 is a vertical sectional view showing the cylinder block. It is. T, φ, -V type engine, 7R, 7L, cylinder row, 8, self-fist engine, 7m-fist cylinder block, 7P, projecting wall, 7C--Φ, connecting wall . Patent applicant: Yama Motor Co., Ltd.

Claims (1)

[Claims] In a competition vehicle configured by connecting the front part of the vehicle body supported by the front wheels and the power transmission unit supported by the rear wheels in the front and back, the V-shaped engine forming the power transmission unit rotates the crankshaft in the longitudinal direction. The cylinder block of the engine is composed of left and right cylinder rows and a lower crankcase that connects the two, and the crankcase is provided with a projecting wall in the direction of the crankshaft, and the left and right cylinder rows are A V-shaped engine structure that is connected by a connecting wall.