JPS6347627Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to an engine used in a two-wheeled motor vehicle.

(Prior art) In conventional motorcycles, in horizontally mounted engines with crankshafts arranged in the vehicle width direction (left-right direction of the vehicle body), a generator is installed to ensure a bank angle as shown in Figures 1 to 4. A layout in which the cylinder block is placed on the back side of the crankcase (above the crankcase and behind the cylinder block) has already been proposed.

Figure 1 is a schematic view of the left side, Figure 2 is a - of Figure 1.
It is a cross-sectional partial schematic diagram. Chain 2 on crankshaft 1
A generator 5a is disposed coaxially with the intermediate shaft 3, which is connected to the intermediate shaft 3 through the intermediate shaft 3, and the generator 5a is connected to the shaft end of the intermediate shaft 3 as shown in FIG. However, in this structure, in order to prevent the inertial mass of the generator 5a from being directly applied to the chain 2, it is necessary to install a torque fluctuation buffer such as a rubber damper 6 between the generator 5a and the intermediate shaft 3. There is a problem in that the aircraft 5a extends largely to the left, making it difficult for the driver to take a desired riding position. Also, intermediate shaft 3
chain 2 must be separated from the crankcase 7 by a distance longer than the radius of the generator 5a.
There is also the problem that the chain becomes longer and chain noise is more likely to occur. Furthermore, even if it is desired to increase the speed of the generator 5a when changing the installed model, there is also the problem that it is difficult to change the drive ratio of the generator 5a.

The structure shown in FIGS. 3 and 4 is another conventional example, in which an intermediate shaft 3 is arranged behind and above the crankshaft 1, and a generator 5b is arranged further behind the intermediate shaft 3, and the generator 5b is connected via a belt 8. The intermediate shaft 3 and the generator 5b are connected together. However, according to this structure, since the generator 5b occupies a large space above the rear part of the crankcase 7, it is difficult to provide a breather chamber with sufficient volume in the upper part of the crankcase 7, and it is difficult to make the volume of the air cleaner 9 sufficiently large. The problem is that it is also difficult to do so. Furthermore, there is also the problem that the belt 8 becomes longer. In order to avoid interference with the generator 5b, the engine mounting hanger 10 at the rear upper end of the crankcase 7 must protrude rearward, resulting in the problem that the overall length of the engine becomes longer.

(Purpose of the invention) The purpose of the invention is to solve the above problems by improving the layout of the generator.

(Structure of the invention) In the present invention, the crankshaft is housed in a crankcase in a horizontal position, an intermediate shaft and a generator are arranged near the crankcase main body part that surrounds the crank chamber of the crankcase, and one side of the main body part is arranged. An intermediate shaft is placed behind the side part of the main body in a posture parallel to the crankshaft, and the intermediate shaft and the crankshaft are connected by a transmission mechanism, and power is generated behind the other side part of the main body part. The machine is placed in such a position that its shaft extends parallel to the intermediate shaft, the mutually adjacent shaft ends of the intermediate shaft and the generator shaft are aligned in their radial direction, and both shaft ends are connected with a pulley and an elastic belt. It is characterized by being connected.

(Example) In FIG. 5, which is a schematic cross-sectional view, the crankshaft 1
5 is a crankcase 16 in a posture extending in the vehicle width direction.
It is placed horizontally inside. The crankcase 16 is integrally provided with an intermediate shaft case 17 that projects rearward, and an intermediate shaft 18 is provided within the case 17 in a position parallel to the crankshaft 15. The right end and left end of the intermediate shaft 18 are supported by the case 17 via bearings 20 and 21. The intermediate shaft 18 is adjacent to the bearing 21 on the left side.
A sprocket 22 is attached to the intermediate shaft 1.
8 is connected to the intermediate portion of the crankshaft 15 via a sprocket 22, a chain 23, and a sprocket 24.

A one-way clutch 25 and a gear 26 are provided around the intermediate shaft 18 between the sprocket 22 and the bearing 20. The gear 26 is connected to the intermediate shaft 18 via a one-way clutch 25 and to a pinion gear 29 of a starter 28 via an idle gear 27. The main body of the starter 28 is located, for example, on the right side with respect to the intermediate shaft case 17.
A support shaft 30 of the idle gear 27 is supported by the case 17.

The generator 31 is provided on the left side of the intermediate shaft 18 in the vehicle width direction and at a position offset in the radial direction of the intermediate shaft 18 . The shaft 32 of the generator 31 is parallel to the intermediate shaft 18 , and the generator 31 is located at a position facing the left shaft end of the intermediate shaft 18 . In other words, the intermediate shaft 18 is the case 1
7 protrudes to the left, while generator 31
is installed with the shaft 32 protruding to the right. A pulley 35 is attached to the protruding left end portion 33 of the intermediate shaft 18.
is fixed by a bolt 36, and a pulley 37 is fixed to the protruding right end of the shaft 32 by a bolt 38. The pulleys 35 and 37 are arranged in the radial direction, and both are connected by a belt 39. The pulley 35 has a larger diameter than the pulley 37, and the generator 31 is driven by the intermediate shaft 18 at an increased speed. The pulleys 35, 37 and the belt 39 do not have teeth, etc., and the pulleys 35, 37 and the belt 39
The contact surface is structured so that slips may occur.

FIG. 6 is a schematic view taken along the - arrow in FIG. 5, in other words, it is a left side schematic view of the main parts. As shown in FIG. 6, the crankcase 16 integrally includes a main body portion 40 surrounding the crankshaft 15 and the crank chamber, and a portion 41 extending rearward from the main body portion 40 to form a transmission case. Inside the case portion 41, a main shaft 43 and a countershaft 44 are provided in a front-back positional relationship parallel to and on the same plane as the crankshaft 15. The case portion 41 also includes a portion 41a that extends upwardly and surrounds the clutch. The cylinder block 42 is mounted on the upper surface of the main body portion 40 in a slightly forwardly inclined position.

The intermediate shaft case 17 is formed by projecting the front end of the transmission case portion 41 upward, and the intermediate shaft 18 occupies a position close to the crankshaft 15. The shaft 32 of the generator 31 is located above and slightly behind the intermediate shaft 18. The generator shaft 32 is located close to the intermediate shaft 18, and the lower part of the generator 31 and the upper part of the intermediate shaft case 17 overlap when seen from the side as shown in FIG. Starter 28 and generator 31
is adjacent to the rear surface of the cylinder block 42 with a gap in between.

A water pump 45 is attached to the front left side of the transmission case portion 41. A suction port 46 of the water pump 45 protrudes forward and downward from the center of the side surface of the pump body, and is connected to a radiator via a pipe (not shown). A discharge port 47 of the water pump 45 projects generally upward from the top of the pump body, and a pipe 48 extending upward from the discharge port 47 passes between the generator 31 and the cylinder block 42 and connects to the cooling water jacket of the cylinder. ing.

As is clear from the above description, the generator 31 is located above the front part of the transmission case portion 41. A large-capacity breather chamber 50 is provided on the rear upper surface of the case portion 41, and the breather chamber 5 is opened from above.
A large-capacity air cleaner 51 extends to the vicinity of the top surface of the air cleaner 5. A hanger 52 that projects upward is provided at the rear upper end of the case portion 41. Hangers 53 and 54 are also provided at the lower rear end of the case portion 41 and at the upper front end of the main body portion 40. The engine is fixed to a frame (not shown) using hangers 52, 53, and 54.

(Function) In Fig. 5, when the engine is stopped, the starter 2
8, the intermediate shaft 18 is driven via the gears 29, 27, 26 and the one-way clutch 25, and the intermediate shaft 18 drives the crankshaft 1 via the sprocket 22, chain 23, and sprocket 24.
5 is driven. After the engine has started in this way, the sprocket 2 is connected by the crankshaft 15.
4, the intermediate shaft 18 is driven via the chain 23 and the sprocket 22, and the intermediate shaft 18 drives the pulley 3.
5. Generator 31 via belt 39 and pulley 37
is driven.

Since the chain 23 is short, the noise generated from the chain 23 is small in both the starting operation and the running operation. Furthermore, even if torque fluctuations due to the inertial mass of the generator 31 are applied to the intermediate shaft 18 or the crankshaft 15, such fluctuations can be buffered by the slip of the belt 39 against the pulleys 35 and 37 and by the expansion and contraction of the belt 39. can.

(Effect of the invention) As explained above, according to the invention, the belt 3
Since the torque fluctuation can be buffered by using the slip and expansion/contraction of 9 (transmission mechanism), a dedicated torque fluctuation buffer is not required, the structure can be simplified, and the generator 31 can be prevented from protruding to the side. , the generator 31 can be prevented from interfering with the driver.

Furthermore, as shown in FIG. 6, the chain 23 (transmission mechanism) can be made shorter than the chain 2 of the conventional generator 5a, thereby reducing chain noise. Furthermore, compared to the conventional generator 5b, since the generator 31 can be prevented from protruding rearward, the capacity of the breather chamber 50 and the air cleaner 51 behind the generator 31 can be set larger. Since the hanger 52 can be made to protrude upward, the overall length of the engine can be shortened.

When using a large-capacity generator with a larger diameter than the illustrated generator 31, the position of the generator will be slightly shifted to the rear,
Although the distance between the shafts 18 and 32 becomes longer, even in this case, by replacing the belt 39, it is possible to easily cope with changes in the generator position. Also, by changing the diameters of the pulleys 35 and 37, the generator 31
Even in this case, since the pulleys 35, 37, etc. are located outside the intermediate shaft case 17, the pulleys 35, 37 can be easily changed. In addition, there is no need to design the engine with special consideration to changes in specifications, for example, there is no need to enlarge the engine in advance so that a large generator can be attached to it, which simplifies the design and manufacture of the engine. The engine can be made smaller.

[Brief explanation of the drawing]

Figures 1 and 2 are a schematic diagram of the left side of the conventional example and -
FIGS. 3 and 4 are a schematic left side view and a schematic cross-sectional view of another conventional example, FIG. 5 is a schematic cross-sectional view of the embodiment of the present invention, and FIG. 6 is a schematic view of FIG. It is. 15... Crank shaft, 16... Crank case, 18... Intermediate shaft, 23... Chain (transmission mechanism), 31... Generator, 32... Generator shaft, 35,
37...Pulley, 39...Belt.

Claims (1)

[Scope of utility model registration request] The crankshaft is housed in the crankcase in a horizontal position, and the intermediate shaft and generator are arranged near the crankcase main body that surrounds the crank chamber of the crankcase, and the intermediate shaft and generator are placed behind one side of the main body. The intermediate shaft is arranged parallel to the crankshaft, the intermediate shaft and the crankshaft are connected by a transmission mechanism, and a generator is installed behind the other side of the main body part so that its shaft is parallel to the intermediate shaft. 2. An automatic machine 2 characterized in that the intermediate shaft and the generator shaft are arranged in an extending position, the mutually adjacent shaft ends of the intermediate shaft and the generator shaft are arranged in the radial direction, and the two shaft ends are connected by a pulley and an elastic belt. Wheel engine.