JPS60227039A - Motorcycle - Google Patents

Abstract

PURPOSE:To facilitate disposing a carburettor by setting a contained angle of left and right cylinders large and upward from the horizontal level to increase the space among an engine, a fuel tank disposed above the engine and a frame. CONSTITUTION:The contained angle of crankpins 32, 32a is set (2beta-180 deg.) for the contained angle beta of left and right cylinders 40, 40a of a multiple-cylindered V- engine, so that though the contained angle beta of the cylinders is above 90 deg. and less than 180 deg., reversing components of primary inertia force can be removed. The forward rotating components of the primary intertia force can be removed by disposing a balancing weight W, the unbalanced quantity of which is m.r. sinbeta, on a reverse extension line of a bisector of a contained angle of the crank pins for radius (r) of rotation of the crank pin and the reciprocating mass (m) of one-side cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motorcycle, and particularly to a motorcycle in which a V-type cost-cylinder engine is mounted on a frame with its cylinder block protruding left and right.

(Prior art) Conventional motorcycles have an engine mounted at the bottom center of the frame with its cylinder block protruding left and right.
The included angle between the left and right cylinders was 180° or 90°. According to this cylinder arrangement, it is possible to eliminate the primary inertia force generated by the reciprocating movement of the piston, etc., and to obtain a motorcycle with less vibration and good riding comfort. However, a motorcycle with a cylinder angle of 180° has a problem in that a large bank angle cannot be obtained because the cylinder blocks protruding from side to side come into contact with the ground when the motorcycle is running. In addition, when the cylinder angle is 90°, there is no problem with the bank angle, but the gap between the fuel tank and the frame above the engine becomes narrow, making it difficult to place the carburetor, air cleaner, etc. there were.

(Objective of the Invention) It is an object of the present invention to solve each of the above-mentioned problems by suppressing vibration to the same level as in the past and making it possible to make the cylinder included angle more than 90° and less than 180°.

(Structure of the Invention) In order to achieve the above object, the present invention provides a motorcycle of this type, in which the included angle β of the left and right cylinders arranged in a V-shape is 90.
The angle is greater than 180° and less than 180°, and crank pins corresponding to each of the cylinders and having different phases are provided at the position of the radius r of the crankshaft, and the pistons reciprocating within each cylinder are connected to the corresponding pistons. Let m be the reciprocating mass of the piston connected to the crank pin via the connecting rod and corresponding to each cylinder, and the included angle between the crank pins is the same as the included angle between the corresponding cylinders. Direction (2β-1800)
and the crankshaft is located on the opposite extension line of the bisector of the included angle of the crank pin, m-r-a1
The present invention is characterized in that a balancing weight having an unbalance amount of nβ is provided.

(Effects of the Invention) In the present invention, the included angle of the crank pin is (2β-1
80°), and a balancing weight with an unbalance amount of (m-?sinβ) was provided on the opposite extension line of the bisector of the crankpin included angle with respect to the crankpin rotation radius r and the reciprocating mass m of the cylinder on one side. Therefore, even though the cylinder included angle β is more than 90° and less than 180°, the primary inertial force can be removed as described later.

Therefore, in the motorcycle according to the present invention, by increasing the included angle of the left and right cylinders and arranging them upward from the horizontal,
The space between the engine, the fuel tank above it, and the frame is widened, making it possible to comfortably accommodate a carburetor and a sufficiently large air cleaner, while also making maintenance, inspection, and replacement easier, and the bank angle is sufficiently large. Moreover, the vibration can be suppressed to the same level as before.

(Embodiment) First, the outline of the present invention will be explained with reference to the embodiment shown in Figs. It is mounted at the bottom center of the frame 10. As shown in FIG. 1 and FIG.
0 and the left side second norinda 40a, and the first
The first piston 41 in the cylinder 40 is connected to the first stove 4
The second piston 41a in the second cylinder 40112 is connected to the second crank pin 3272 via the second connecting rod 42fl+. The included angle β between the cylinders 40 and 40111 is greater than 90° and less than 180° (140° in the embodiment),
The rotation radius of the crank pins 32, 32a is r1, the piston 41 (41a) with respect to the cylinder 40 (4Qa) on one side,
Stove throat 42 (42a), piston pin 43 (43a)
) etc., the included angle A between the first crank pin 32 and the second crank pin 3217 measured in the direction (counterclockwise direction) from the first cylinder 40 toward the second cylinder 4Qa is (2β -180°), and the crankshaft 6
0, a balancing weight W having an unbalance amount of (m-r-sinβ) is provided on the opposite extension line of the bisector of the crankpin included angle A. With the above configuration, this embodiment achieves the effects of the present invention described above.

Next, this embodiment will be described in detail.

As shown in FIGS. 6 and 4, the V-type two-cylinder four-cycle engine 2Q has cylinder blocks 21° 21a that protrude left and right, and is mounted at the center of the lower part of the frame 10 of the motorcycle so that the crank axis coincides with the traveling direction of the vehicle. It will be installed. The fuel tank 11 is installed on the upper side of the engine 20, straddling the tank tray/L'10a of the frame 10 (see Fig. 1).
A sort 12 is placed behind it. A carburetor 26°23111 and an air cleaner 24 are arranged above the left and right cylinder blocks 21, 2111+ arranged in a V-shape.

The upper side of the cylinder blocks 21, 216 is the fuel tank 11
Since the space is limited by Tankun-/I/10a, the angle β of the cylinder block 21.21a is set to 14.
Lower the position of the cylinder block 21.2112 to 0°, and secure the base for the carburetor 26, 2-loa a, and air cleaner 24. If the included angle β is about 1400, as shown in FIG. 2, the cylinder glocks 21, 21a will not be located below the left and right footrests 16, so the problem of a decrease in the bank angle will not occur. The included angle β is supported by the front wheels 14 and the rear part is supported by the rear wheels 15 due to engine displacement, purpose of use of the vehicle, cooling performance, aerodynamic characteristics, and ignition.

As shown in FIG. 1, the engine 20 includes a crank case 722 located at the center and cylinder blocks 21, 21a protruding from the left and right sides of the front upper part of the crank case 722.
The rear wheels 15 are driven through a transmission (not shown) within the vehicle. Cylinder Glock 21.210 is cylinder 40.4
012, and the included angle of the cylinder 40.400 is the same as the included angle β of the cylinder block 21.2112. As shown in FIGS. 1 and 2, the crankshaft 30 has a front and rear crankshaft rotation angle /l'31, front and rear webs 33, 33a
.

It consists of an intermediate web 64 and a crank pin '52.degree. The crank pins 32.32112 are out of phase with each other, and the first crank pin 32 is connected to the first connecting rod 42 and the first pinuton pin 4.
The first cylinder 40 is slidably provided in the first cylinder 40 via the first
The second crank pin roller 2a is connected to the piston 41 and the second crank pin roller 2a is connected to the piston 41.
It is connected to the second piston pin 41a in the second cylinder 40f7 via the connecting rod 4217 and the second piston pin 43a.

The webs 33, 53a, 54 have a crank pin lobe 2°3.
At a position on the opposite extension line of the bisector of included angle A of 212,
A counterweight W is provided. The counterweight W may be provided by cutting the web on the side of the crank pin 52.32a, as shown in Fig. 2, or by drilling a hole in the web and filling it with a metal with a high specific gravity such as lead. It's okay.

A carburetor 25 is connected to the upper side of the cylinder Glock 21.2117 via an intake pipe 26.26a between it and the fuel stove 11.
．． 25a is provided, and the suction side of the same vaporization 'a 25.25(2) is located inside the air cleaner 27 provided in the recess on the lower side of the fuel tank 11 between Kunkle tV'1O(l).

When the engine 20 operates, the outside air is transferred to the air cleaner 2.
7, enters the vaporization ``!25, 25a, becomes a mixture and is supplied into the air supply pipe 26.
．． 28 (exhausted from the rear end via Z).

Next, when the included angle β exceeds 90° and is 180°, the crank pin included angle A and balance iJw for removing the primary inertial force will be explained. In the following description, the direction of the inertial force is assumed to be on a complex plane, the X axis is the real axis, the y axis is the imaginary axis, and the crankshaft rotation angle is clockwise θ.

Since the V-type two-cylinder engine is also a combination of single-cylinder engines, the primary inertia force F of the single-cylinder engine shown in FIG. 7 will be described first. If a rotating tank is prepared in advance, the primary inertial force F becomes V as shown below.

]31=m1r龜ω2−COB0 However, m: Mass of the piston 2 and the reciprocating part due to the stove, throat, etc. r: Piston pin rotation radius of the crankshaft 1 ω: Rotation angular velocity of the crankshaft 10 0: Rotation angle of the crankshaft 10 Fig. 1 In FIG. 5, which schematically shows the embodiment of FIG. 2, the primary inertia force F1 generated from the first cylinder 40 side is expressed by the formula (1), and the primary inertia force F2 generated from the second cylinder 4012 side is expressed as follows. Similarly...(3) However, σ: Difference in the phase angle between the first crank pin and the second crank pin measured in the 0 direction. Therefore, the composite 1 from the first cylinder side and the second cylinder side
The next inertial force F is as follows.

F=F, +F2 Same rotating part Reverse rotation part In formula (4), the same rotating parts are webs 33, 33a.

Although it can be removed by providing a counterweight W at 34,
The counter-rotating part cannot be removed with a counterweight, and cos(-
+β)-〇, and it can be removed only in the case of self-tari on the rank. Based on this condition, the phase difference σ between the crank pins 32 and 32a is calculated as follows.

cos(-+β)-〇 From α=(2n+1)・π-2β Since the included angle β is more than 90° and 180° US meter, if the range of σ is between 00 and 360°, n = 1 and σ
=6π-2β=540°-2β. If we substitute the range of included angle β, the value of α is 18o0
It becomes less than 60°. In this way, the value of α is 18o
Since it exceeds 0, it is unnatural to call it the included angle of the crank pins 32, 32a. Therefore, if the coordinates and standards are set as shown in Figure 5, the angle A (= 360° -
α) is called the included angle of the crankshaft/32, 32a.

A=360°-α=2β-180° If the included angle A of the crank pins 32, 32a is set to the above value, the reverse rotation portion of the primary inertial force can be eliminated.

Next, in order to remove the same rotation part of the primary inertial force, the formula (4
), clockwise from the first crank pin 32 (-+18
0°), that is, the position W' in FIG.
It can be seen that it is sufficient to provide a balancing weight with an unbalance amount of r-coe-). child! Since cos-='cOs(270°-β)=-θ1nβ, m-r-coe-=-m-r-sinβ. And from 90°〈β × 180° 0〈sinβ〈1
Therefore, at a position rotated by 180 degrees from W', that is, on the opposite extension line of the bisector of included angle A, (m-r・si
It is sufficient to provide a balancing weight W having an unbalance amount of nβ).

Note that if the first cylinder 40 and the second cylinder 4011+ are reversed as shown in FIG. 6, the following results will be obtained in the same way as above.

2 F=F, +F 2 Similarly to the above, in order to remove the reverse rotation part of the primary inertial force, α=2β−180° from 00 days−β=0. In this case, α exceeds 0° and is less than 180°, so α is greater than 0° and less than 180°. ．． This is the included angle of 32a.

Also, in order to remove the same rotating part of the primary inertial force, the first crank pin 62! At the position 1l (-11800), that is, on the opposite extension of the bisector of the included angle α, (m-r-ei
It is sufficient to provide a balancing weight W having an unbalance amount of nβ).

Note that if the rotation direction of the crankshaft 30 is counterclockwise, the fifth
It is sufficient to think of the figures and Fig. 6 as viewed from the back side of the paper, and the one in which the first cylinder 40 is on the right side is the same as in Fig. 6, and the one in which the first cylinder 40 is on the left side is the same as in Fig. 5. .

The above results can be summarized as follows.

In a ■ type multi-cylinder engine as shown in Figs. 1 and 2, in order to remove the reverse rotation component of the primary inertia force, the included angle A (or α) between the crank pins 32 and 32a should be adjusted accordingly. The included angle β between the cylinders 40° and 40111 may be set in the same direction (2β-180°). In this case, the same direction means, for example, from the first cylinder 40 to the second cylinder 40.
When the cylinder included angle β toward the cylinder 40a is counterclockwise V (see FIG. 5), the crank pin included angle A also increases from the first crank pin 62 toward the second crank pin 3242 (2β−
180°). In addition, in order to remove the same rotational component of the primary inertial force, a counterweight W is provided on the crankshaft 30, and the counterweight W is positioned at the crank pins 32, 3? included angle A
(or α), the unbalance amount may be m'r-8inβ.In the above embodiment, a V-type two-cylinder engine was explained, but the present invention By arranging a plurality of cylinders in series, the present invention can be applied to a V-type multi-cylinder engine or a larger V-type multi-cylinder engine.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention, and FIG.
1 in Figure 6 is a cross-sectional view showing the main parts of a type two-cylinder engine.
-1 corresponds to a sectional view, and Figure 2 is a perspective view of the main part,
Figure 6 is a 1ll side view of the motorcycle of this embodiment, Figure 4 is a front view, Figures 5 and 6 are illustrations of the balance of primary inertia, and Figure 7 is a diagram of the single cylinder engine. It is an explanatory diagram of balance. Explanation of symbols 10... Frame, 20... V-type multi-cylinder engine, 21.21 (2... Cylinder block, 30...
Crankshaft, 321s 2'"" crankpin,
40゜4012...Cylinder, 41,41a...Bineton, 42.4212...Conlot, α, A...
・Crank pin included angle, β... Cylinder included angle, W...
Counterweight. Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Teru Hase - (1 other person) Figure 2g Figure 15 Figure 6 Figure m7!

Claims (1)

[Claims] In a motorcycle in which a V-type multi-cylinder engine is mounted at the center of the lower part of the V-frame with its cylinder block protruding left and right, the included angle β between the left and right cylinders arranged in a V-shape exceeds 90° and is 180°. A crank pin corresponding to each cylinder and having a different phase is provided at a position of radius r of the crankshaft, and a piston that reciprocates within each cylinder is connected to each corresponding crank pin. The reciprocating masses of the pistons, connecting rods, etc. that correspond to the respective cylinders are respectively m, and the included angle between the crank pins is set in the same direction as the included angle between the corresponding cylinders (2β- 180
°), and the crankshaft is located on the opposite extension line of the bisector of the included angle of the crank pin m-r-
1. A motorcycle characterized in that a balancing weight having an unbalance amount of sin β) is provided.