JPS59195482A - Motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a motorcycle equipped with an engine having one cylinder or a plurality of cylinders arranged in parallel between the front and rear wheels, and particularly relates to the front and rear wheels of the motorcycle. The purpose is to shorten the distance between the two as much as possible.

[Prior art]

Generally, a moving unit including an engine and a transmission is mounted between the front and rear wheels of a motorcycle.

In recent years, there has been a trend for high-output dynamic crab knits to be required to increase the speed of motorcycles, but since such movable kaninits have large engines and transmissions, the distance between the front and rear wheels becomes large, making it difficult for the vehicle to move. [Summary of the Invention] This invention was made to solve the above-mentioned problems. An engine supported in the left-right direction of the vehicle and a transmission connected to this engine form a dynamic crab unit, and this dynamic crab unit is mounted between the front and rear wheels, and the axis of the crankshaft is aligned with the axis of the cylinder. It is distinctive in that it is placed biased toward the front or rear.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments.

In FIG. 1, 1 is a motorcycle, and a front wheel 4 is supported at the front end of a body frame 2 via a front fork 3, and a rear wheel 6 is supported at the rear via a rear fork 5. . Reference numeral 51 designates a shaft to which the rear fork 5 is attached, and reference numeral 5b designates a buffer spring that suspends the rear fork 5 with respect to the vehicle body frame 2 so as to be vertically swingable. The vehicle body frame 2 has a cradle shape in which a main pipe 2b extending rearward from a steering shaft pipe 2a at the front end and a descending pipe 2c extending downward are connected to each other at the lower end by a horizontal pipe 2d. Reference numeral 7 denotes a parallel type air-cooled four-cylinder internal combustion engine 7a, which is a movable crab unit mounted between the front wheels 4 and the rear wheels 6.
and a transmission 7b. The moving crab knit 7 has a rear part supported by the main pipe 2b, and a front part supported by the descending pipe 2c.
Supported by 2e is the descending pipe 2C
This is a bracket that is fixed to and supports the front part of the movable crab knit 7.

The internal combustion engine 1a and the transmission 7b are housed in an aluminum alloy case, and a crank chamber 8 is formed in two parts of the case. A crankshaft 9 is rotatably supported in the crank chamber 8, and the crankshaft 9 is connected via a connecting rod 10 to a piston 12 that is slidably fitted into a cylinder 11. A cylinder head 14 covers the top surface of the cylinder 11, and a combustion chamber 15 is formed between the cylinder head 14 and the top surface of the piston 12. The cylinder head 14 is connected to an intake passage 16 and an exhaust passage 17 that open the inside of the combustion chamber 15 to the atmosphere.

That is, the upstream side of the intake passage 16 opens into an air cleaner box 6a that also serves as an intake expansion chamber.

16b is F paper, 16c is an intake pipe that opens the inside of the air cleaner box 6a to the atmosphere, and 18 is a carburetor provided in the middle of the intake passage 16.

The downstream side of the exhaust passage 17 is connected to a muffler 17b attached to the rear of the vehicle body via an exhaust pipe 17&, and burned gas discharged from the internal combustion engine 1a is muffled by the exhaust pipe 17& and released into the atmosphere. The transmission 7b is housed in a case that is integrated with the case that constitutes the crank chamber 8, and its output is transmitted to the rear wheel 6 via a drive shaft (shown) inserted through the rear fork 5. . 21 is a generator mounted on the upper part of the transmission 7b;
2 is a starting electric motor for starting the internal combustion engine 1a. 25 is a fuel tank supported by the main pipe 2b;
6 is a seat for a passenger.

Here, X is the axis of the crankshaft 9, and 2 is the axis of the cylinder 11.0 Fig. 2 shows another embodiment, in which the internal combustion engine 7 is of a water-cooled type, and the downward knob 2C on the front of the engine 7 is a water-cooled type. In the first embodiment shown in FIG. 1, in which a radiator 23 for engine water cooling is attached to the internal combustion engine 7, the axis 2 of the cylinder 11 is offset to the front side from the axis X of the crankshaft 9. In the second embodiment shown in FIG. 2, the axis 2 of the cylinder 11 is offset from the axis X of the crankshaft 9 to the rear side.

That is, in the first embodiment, the cylinder 11 is biased forward relative to the crankshaft, and the rear space of the cylinder head 14 is accordingly enlarged, and an air cooler box that also serves as an intake expansion chamber upstream of the intake passage 16 is formed. 16& can be further enlarged to reduce intake noise emitted by motorcycles.

In the second embodiment, the cylinder 11 is displaced rearward from the crankshaft 9, and the entire power unit 7 is suspended on the vehicle body frame 2 at a position slightly displaced forward, so that the accommodation space of the intake passage 16 is not reduced. At the same time, a space for accommodating the radiator 23 in front of the engine 7 is created.

In other words, since the transmission 7b at the rear end of the moving crab unit moves forward with respect to the vehicle body frame 2, the attachment of the rear fork 5 that supports the rear wheel 6 moves the shaft 5a forward, reducing the distance between the front and rear wheels. can be shortened.

When the engine of this embodiment is operated, the crankshaft 9 rotates with the movement of each piston 12, similar to the conventional engine, and output is delivered to the rear wheels 6 through the transmission 21.

〔Effect of the invention〕

As described above, this invention constitutes a dynamic crab unit with an engine arranged with the axis of the cylinder facing downward on the road and the crankshaft facing left and right of the vehicle, and a transmission connected to this engine, The moving crab unit is mounted between the front and rear wheels, and the axis of the crankshaft is placed biased toward the front or rear of the cylinder axis, so the size of the parts placed before and after the engine or transmission will vary. Depending on the size of the space left before and after the engine, only the upper part or only the lower part of the movable crab knit can be moved forward of the vehicle body. Therefore, a space is partially provided in the upper or lower part behind the engine, and the vehicle can be made smaller and lighter. Therefore, the vehicle can be easily handled and manufacturing costs can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a side view of the main parts of a motorcycle, and FIG. 2 is a side view of the main parts of the embodiment showing another embodiment. War...Vehicle frame, 4...
...Front wheel, 6...Rear wheel, 7...Dynamic crab knit, Ta...Internal combustion engine, 7b...Transmission, 8...
・・Crank chamber, 9・φe・Crankshaft, 16・Bone・・
Intake passage, 16&#...Air cleaner box O patent applicant Yamano Motor Co., Ltd. agent Kazuo Yamakawa (I
1 person)

Claims (1)

[Claims] A dynamic crab unit is constituted by an engine supported in an illumination two-ink box with cylinders oriented vertically and crankshafts oriented horizontally of the vehicle, and a transmission driven by this engine,
This motorcycle is equipped with this dynamic crab knit between the front and rear wheels, and the axis of the crankshaft is biased forward or backward relative to the axis of the cylinder. (2) The dynamic crab unit is a motorcycle according to claim 1, which includes an engine disposed with the axis of the crankshaft offset forward from the axis of the cylinder, and a transmission disposed at the rear of the crank box. . (3) The automatic crab unit according to claim 1 includes an engine in which the axis of the crankshaft is offset rearward from the axis of the cylinder, and a large air cleaner disposed behind the cylinder of the engine. Two-wheeled vehicle.