JPS6047823A - Engine for motorcycle - Google Patents

Abstract

PURPOSE:To make the structure of an engine compact, by disposing two crankshafts in parallel with each other to extend in the direction of the center line of the vehicle body with a proper spacing from each other and a proper displacement in the longitudinal direction of the vehicle body, and turning the two crankshafts at the same speed in the opposite directions to each other. CONSTITUTION:Two crankshafts 6a, 6b are disposed in parallel with each other on the opposite sides of the center line AB of a vehicle body, and the opposite ends of these crankshafts 6a, 6b are supported respectively by crankcases 7a, 7b in a freely rotatable manner. Further, two cylinder blocks 11a, 11b having pistons 9a, 9b connected respectively to the crankshafts 6a, 6b via connecting rods 8a, 8b are disposed side by side in the longitudinal direction of the vehicle body, and they are coupled to respective crankcases 7a, 7b. A cylinder block 11a for driving the leftside crankshaft 6a is disposed to face to the right while a cylinder block 11b for driving the right-side crankshaft 6b is disposed to face to the left. With such an arrangement, the two crankshafts 6a, 6b are turned at the same speed in the opposite directions to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an engine for a motorcycle mounted on a motorcycle to drive the same, and particularly to an improvement in an engine that is effective as an opposed piston type engine.

(Background technology) [Motorcycles have a long history, and there are various types of engines installed in them! I have something like (1).

For example, an upright single cylinder type, the middle cylinder to 1iii force 11/!
Slanted type, 2 cylinders instead of single cylinder, 3 air ↑111.4
There are parallel multi-cylinder engines with cylinders, 6 cylinders, 6 air f,', ] perpendicular to the direction of travel, and ■-type engines that combine two cylinders in a V-shape, and V-type engines also have 11 rows in the direction of travel. There are those arranged in a shape, and those arranged in a V J (17) perpendicular to the direction of travel.Also, as shown schematically in Fig. Q51, extra copies of crank 1 are installed on both sides of the crank case 2, There is also a horizontally opposed piston type engine in which a is protruded to the left I-1 of the II resting body.In Fig. 1, 1 and 4 are the transmission, and 5 is the drive shaft. In addition to the opposite left and right sills,
A single crankshaft located on the centerline of the vehicle body is rotated via connecting irons 1 connected to each piston.

In a motorcycle, it is important to have good steering performance and stability. To achieve this, the important factors are a low center of gravity, a small vehicle body width, and a large hang angle (the angle at which the vehicle body does not touch the road surface even when tilted).

The above-mentioned horizontally opposed piston type engine has a lower center of gravity than other upright or tilted type engines, but on the other hand, the width of the engine is large and the cylinders are 71 cm away from the side of the car body. Because it protrudes greatly toward the side, it is difficult to get a large puncture angle. In order to eliminate this drawback, it was necessary to mount the engine higher on the car body, and a compromise was needed to make the most of these contradictory features. In addition, because the rank rotates in one direction parallel to the center line of the vehicle body, maneuverability deteriorates due to the action of a counter torque moment that occurs in the direction of tilting the vehicle body to the side.

(Objective of the present invention) In order to eliminate the above-mentioned disadvantages, the present invention has a structure with a low center of gravity and a small width, which cancels out the counter-torque moment caused by the rotation of the crank and reduces it to zero. The company's goal is to provide motorcycle Ichikawa engines that are capable of producing high-performance motorcycles.

(Structure of the present invention) The motorcycle engine of the present invention has two crankshafts parallel to each other in the direction of the center line of the intermediate rest, with an interval between them.
The cylinders that drive the crankshaft on the left side of the car body are placed on the right side of the car body, and the cylinders that drive the crankshaft on the right side are placed on the left side of the car body. The crankshafts are connected so that each crankshaft rotates at the same speed.

(Embodiments of the present invention) Next, the present invention will be explained in more detail while explaining embodiments shown in +24.

FIG. 2 is a cross-sectional plan view of a water-cooled engine shown as an embodiment of the present invention. AB is the centerline of the vehicle body, A is the front direction, and B is the rear direction. In the case of a motorcycle, the centerline of the vehicle body almost coincides with the centerline of the engine.

The front and rear ends (top and bottom in the drawing) of two wooden crankshafts 6a, 6b placed on the left and right sides of the center line AB of the vehicle body are rotatably supported by crankcases 7a, 7b, and the crankshafts 6a, 6b are rotatably supported by crankcases 7a, 7b. connecting rond 8
Two cylinder parts 11a, 1.1b having cylinder parts 10a and lobs, in which pistons 9a and 9b connected via pistons 9a and 8b are loosely fitted, are lined up in the left and right directions in the front and rear direction and are connected to each crankcase 7a and 7b. is combined with The cylinder block 11a that drives the left crankshaft 6a is arranged toward the right, and the cylinder block llb that drives the right crankshaft 6b is arranged toward the left. A cavity 12 is formed between the opposing sides of both cylinder blocks i l h, llb, and in this cavity 12, one end of the wooden crankshafts 6a, 6b is inserted. Fixed gears 13a and 13b of the same number are meshed. Therefore, the crank shirts 6a and 6b rotate at the same speed in opposite directions when the engine is running. Supports the crankcases 7a and 7b] ・Kushishi 71・
Of 6a and 6b, the rear crankcase; 6b is
It functions as an output shaft for extracting the engine output from the two cylinders, and a flywheel 14 is fixed to the rear end of the crankshaft 6b, which is further connected to the drive shaft via a flange and a transmission (not shown).・5
is combined with

At the neck of each cylinder block lla, llb, as in a normal engine, an air intake valve 17 for controlling the opening and closing of the air intake 1115, υ[air 1 go 16 and each of these f], and an exhaust go t18 are installed. Cylinder hems 1ζ 19a and 19b are provided. Schilling hand 19 a If on the left side crankshaft 6a, l' 19 b on the left side.

In this way, each cylinder block, Schilling Hen I.
Because the engine is placed in the opposite direction to the direction in which it is offset to the side from B, the width of the engine is 1 tree compared to a conventional horizontally opposed bistonno'4'4 engine with cylinder blocks and cylinder holes on both sides of the crankshaft. 1 (I) by the distance between the center lines of the two crankshafts 6a, 6b
can be reduced.

In order to drive an automatic heavy industry/damaged vehicle with this engine, fuel must be supplied to the cylinder portions 10a, 1, and Ob in each cylinder block. Send 41a aiki of ki and explode it to make the pistons 9a and 9b reciprocate and move the crankshaft 6.
a and 6b, both crankshafts 7
Since l-6a and 6b are connected by gears 13a and 13b, each crankshaft 6a and 6b rotates in opposite directions to each other at rotational speed, and the rotational force of crankshaft l-6a is applied to the other crankshaft. 6b, and together with the rotational force of the crankshaft, it is transmitted to the drive shaft 5 via the transmission to rotate the wheels. Such driving force transmission from the engine to the wheels is carried out by the drive shaft. First, by changing the structure of the transmission, it is also possible to use a chain or belt.

In the illustrated embodiment, 24. To rotate the crankshafts 6a and 6b of
3a and 13b were used to rotate each crankshaft in opposite directions, but in order to rotate both crankshafts in synchronization, a chain or stage (=
It is also possible to use a J belt, and in this case, each crankshaft will rotate in the same direction unless another transmission mechanism is used, but as described above, gears are used to rotate both crankshafts 6a and 6b. When connected, the following effects can be obtained. In other words, if one crankshaft is placed in the direction of the center line of the vehicle, the rotation of the engine will be 1
A force is generated on the 11th crankshaft in the opposite direction to the direction of rotation, but the 2nd crankshaft 6a, 6b
By rotating the two wheels in opposite directions, this force can be canceled out and the maneuverability of the white-moving two-six-wheeled vehicle can be improved.

In addition, the embodiment shown in IΔ shows an example of a horizontally opposed piston type 4-cycle 2-cylinder engine as a type that has the greatest effect of narrowing the width of the engine by providing two crankshafts. The invention is not limited to this type of engine, but can also be applied to a two-stroke engine or an engine with a V-shaped crank arrangement to narrow the width of the engine. Furthermore, it is also possible to have a configuration in which two or more pistons are connected to each crankshaft 6a, 6b.

(Effects of the present invention) Since the engine for a mechanical two-wheeled vehicle of the present invention is configured as described above, when mounted on a motorcycle, even if the engine position is lowered and the center of gravity is lowered, the cylinder nd or 1
Since there is no longer a large protrusion on either side of the engine, the bank angle can be larger than that of conventional horizontally opposed piston engines, and the low center of gravity improves the maneuverability and stability of motorcycles. I can do it.

[Brief explanation of drawings]

FIG. 1 is a side view [Δ] schematically showing a motorcycle equipped with a horizontally opposed piston type engine, and FIG. 2 is a cross-sectional plan view showing an embodiment of the engine of the present invention together with a part of the vehicle body. Cylinder, 1a Nijiring\7, 2 Crankcase, 3: Vehicle body, 4: Transmission, 5, Drive shirt I, 6
a, 6b・crank・; Yahoo I・, 7a, 7b・crankcase, 8a, 8b=connecting groove [・, 9a
, 9b° piston, 1°a, 10b Niji cylinder part, 11
a, IIb Nijilinda Proaku, 12 vacant room, 13a,
13b: UL car, 14 flywheel, 15: air supply 1
1.16, υ1qi ['', 17: Air supply valve, 18: 4J
lki jr, 19a, 19b: syrintahent. #'f jl Applicants: Fusa Nomura, Osamu Osamu, Nakagomori Koyama (and 1 other person)

Claims (1)

[Claims] Two wooden crank shirts l-(6a) (6b) are provided parallel to each other with an interval and shifted in the length direction,
Two sets of cylinder solos (,
11a) '(1l b) with the crankshaft (6a) for the right cylinder solo lock (lla) on the left with respect to the center line (AB) of the vehicle body, and the left cylinder block (
llb) River Crank Shirt) (6b) is placed on the right side, and both crankshafts are connected to rotate at a rotational speed.A motorcycle engine.