JPH0350084A - Motorcycle with single-cylinder engine - 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] (Industrial application field) The present invention relates to a motorcycle equipped with a single-cylinder engine.

(Prior Art) In a single-cylinder engine for a motorcycle, a generator is normally installed at one end of the crankshaft that drives the camshaft of the intake and exhaust system via a camshaft drive means consisting of gears, chains, etc., and a generator at the other end. A driving means such as a primary gear that interlocks the transmission with the crankshaft via a clutch device connected thereto is provided, and a cylinder is installed in the middle of the crankshaft between the two in a direction perpendicular to the two. A piston that can freely slide inside is connected. A main shaft and a subshaft that are interlocked via a speed change gear of the transmission are arranged parallel to the crankshaft. Further, the cam driving means is provided between the piston and the generator or between the piston and the driving means in the axial direction of the crankshaft.

Conventionally, this type of engine is mounted on a vehicle body frame with the crankshaft facing in the vehicle width direction of the motorcycle and the piston axis positioned approximately on the vehicle body center line in the vehicle width direction. Generally, the amount of engine protrusion to the left and right with respect to the centerline of the vehicle body is greatest at the clutch device and generator.

However, since the cam driving means is provided between the piston and the generator or between the piston and the clutch device in the axial direction of the crankshaft, tension on the clutch device side and the generator side with respect to the vehicle body centerline is The amount of protrusion is larger on one side than the other, and therefore the amount of protrusion on the left and right sides with respect to the center line of the vehicle body is uneven, making it easy for the driver's riding posture, especially the position to support the legs, to be restricted. When installing a fairing on a motorcycle, in order to equalize the amount of protrusion of the fairing to the left and right, the fairing is attached to match the engine with the larger amount of protrusion. On the side where the engine has a smaller protrusion, an unnecessary space is created between the engine and the fairing, which hinders miniaturization of the motorcycle.

In addition, in conventional engines, the axis of the piston is located on the center line of the vehicle body, so engine vibrations caused by the sliding of the piston are directly transmitted to the vehicle body frame, making the entire vehicle body likely to vibrate, improving the riding comfort of the motorcycle. In order to achieve this, it was desired to reduce the vibration.

(Problems to be Solved) The present invention solves such disadvantages, and provides a motorcycle capable of making the amount of engine protrusion in the vehicle width direction uniform on the left and right sides, and reducing vibrations transmitted from the engine to the vehicle body. The purpose is to provide

(Means for Solving the Problems) In order to achieve the above object, the motorcycle equipped with the single-cylinder engine of the present invention provides an engine near one end of the crankshaft that drives the camshaft of the intake and exhaust device via the camshaft drive means. A generator is provided at the crankshaft, and a driving means for interlocking a transmission installed in parallel with the crankshaft via a clutch device is provided near the other end of the crankshaft, and a driving means is provided near the other end of the crankshaft, and the driving means is provided in the vicinity of the other end of the crankshaft and is orthogonal to the crankshaft. In a motorcycle equipped with a single-cylinder engine in which a piston slidable within the cylinder in the axial direction of the crankshaft is connected to an intermediate portion of the crankshaft, the camshaft driving means of the engine is connected to the piston in the axial direction of the crankshaft. The engine is installed with its crankshaft facing in the vehicle width direction, and with the vehicle body centerline in the vehicle width direction located between the axes of the camshaft drive means and the piston. It is characterized by

A balancer weight, which is rotated in conjunction with the crankshaft via the drive means, is attached to one of the main shaft and subshaft of the transmission and is rotated around the shaft at a position near the clutch. It is characterized in that it is supported so that it can move freely.

(Operation) According to this means, in the engine, the generator, the front camshaft drive means, the piston, and the drive means are arranged in order from one end side to the other end side along the crankshaft. and since the vehicle body centerline is located between the camshaft drive means and the piston, the distance from the vehicle body centerline in the direction of the crankshaft of the generator and the clutch device is defined as the road distance. It becomes possible to make the amount of left and right protrusion of the engine with respect to the vehicle body center line equal to the road distance.

Since there is a gap between the axis of the piston, which is the center of vibration of the engine, and the center line of the vehicle body, vibrations at the center of vibration of the engine are not directly transmitted to the center position in the width direction of the vehicle body of the motorcycle. Vibration of the vehicle body at the center position is reduced.

(Example) An example of a motorcycle equipped with a single-cylinder engine of the present invention will be described with reference to FIGS. 1 to 4. FIGS. 1 and 2 are an explanatory longitudinal sectional view and an explanatory cross-sectional view of the engine, respectively, FIG. 3 is a side view of a motorcycle equipped with the engine, and FIG. 4 is taken along lines IV-IV in FIG. FIG.

In FIGS. 1 and 2, 1 is a crankshaft rotatably supported by a crankcase 2 of an engine E, and 3 is rotatably supported by the crankcase 2, and is connected to the crankshaft via a transmission gear train 4. Transmission device with coupled main shaft 5 and counter shaft 6, 7
8 is a clutch device mounted on the main shaft 5 of the transmission 3 outside the crankcase 2; 8 is a piston that is slidable in a cylinder 9 mounted on the crankcase 2 in a direction orthogonal to the crankshaft l; It is installed on the cylinder 9 and forms a combustion chamber 11 between it and the piston 8.
1 is a cylinder head equipped with an intake/exhaust passage (not shown) that communicates with the cylinder head 1; 12 is an intake/exhaust device installed in a head cover 13 mounted on the cylinder head 10 and performs intake/exhaust from the combustion chamber 11; 14 is an outside of the crankcase 2; This is a generator attached to the end of the crankshaft 1.

As shown in FIGS. 1 and 2, the crankshaft 1 has a pair of crank webs 15 and 16 housed in the crankcase 2, and is rotatably supported by the crankcase 2 via bearings 17 and 18. has been done. A crank pin 19 that connects the crank webs 15 and 16 is connected to the piston 8 via a connecting rod 20, and as the piston 8 slides, the crankshaft l is moved to the second position.
As shown in the figure, it rotates around its axis.

As shown in FIGS. 1 and 2, the main shaft 5 of the transmission 3 is rotatably supported by the crankcase 2 via bearings 21 and 22 and is provided parallel to the crankshaft 1. The clutch device 7 is connected to the end protruding from the inside.

This clutch device 7 includes a crankshaft 1 as shown in the first diagram.
The main shaft 5 is located near the end of the crank web 16 side.
The clutch outer 23 is fitted around the end of the clutch outer 23, and the clutch inner 24 is housed inside the clutch outer 23 and rotatably attached to the main shaft 5. The clutch plate 25 is rotatable concentrically and integrally with the main shaft 5 through a plurality of clutch plates 26 which are overlapped and pressed together with the main shaft 5.

The clutch outer 23 includes a primary drive gear 27a rotatably attached to the end of the crank web 16 protruding from inside the crankcase 2 of the crankshaft 1, and a crank of the clutch outer 23. It is connected to the crankshaft l via a drive means 28 consisting of a primary driven gear 27b fixed to the end face on the case 2 side concentrically with the main shaft 5 and meshed with a primary drive gear 27a at a gear ratio of 1:1. . The primary driven gear 27b protrudes from the inside of the crankcase 2 of a hollow shaft 30 that is rotatably fitted onto the main shaft 5 via a needle bearing 29 and interposed between the main shaft 5 and the bearing 22. It is rotatably fitted to the outer peripheral surface of the end portion by spline connection.

Therefore, when the crankshaft 1 is rotated as described above,
Clutch outer 23 and hollow shaft 3 via drive means 28
0 rotates about the axis of the main shaft 5 at the same speed and in the opposite direction to the crankshaft 1, and the clutch inner 24 and the main shaft 5 are connected to the clutch outer 23 via a plurality of clutch plates 26 which are overlapped and pressed together. and rotates together with the hollow shaft 30 about its axis as shown in the second figure.

As shown in the first figure, the clutch device 7 includes a bushing rod 31 slidably inserted into the main shaft 5 toward the lifter plate 25, and the bushing rod 31 is moved by a clutch drive device (not shown) to move the lifter plate 25. The clutch plates 26 are slid in a direction away from the clutch inner 24 to release the mutually pressed state of the clutch plates 26. At the time of release, the clutch device 7 is in a disconnected state and the clutch inner 24 and the main shaft 5 are not rotated. It doesn't move.

As shown in FIGS. 1 and 2, the subshaft 6 of the transmission 3 is rotatably supported by the crankcase 2 via bearings 32, 33 and is provided parallel to the crankshaft 1. It is connected to the main shaft 5 through the transmission gear train 4, and rotates in conjunction with the main shaft 5 at several speeds depending on the meshing combination of the transmission gear train 4, similar to known transmission devices. It has become. A driving sprocket 34 is rotatably attached to the end of the countershaft 6 protruding from the inside of the crankcase 2, and the driving sprocket 34 is connected to a rear wheel W (described later) via a chain 35.
r (shown in the third diagram), and the rotation of the subshaft 6 is connected to the rear wheel Wr.
is transmitted to.

Therefore, the driving force of the engine E accompanying the sliding of the piston 8 is output from the subshaft 6 of the transmission 3 to the rear wheel Wr via the crankshaft 1, the drive means 28, the clutch device 7, and the transmission 3 in this order. be done.

As shown in the first diagram, the generator 14 is rotatably mounted integrally with the end of the crank web 15 of the crankshaft 1 protruding from inside the crank case 2 on the opposite side from the clutch device 7. The stator 38 is fixed to the inner surface of a generator cover 37 attached to the side of the crankcase 2 and housed in the flywheel 36. Similar to known generators, the crankshaft 1
When the flywheel 36 rotates, the flywheel 36
At the same time, it rotates around the stator 38 to generate electricity, thereby charging a battery (not shown).

The intake/exhaust device 12 includes a bearing 3 between the cylinder head 10 and the head cover 13 as shown in the first diagram.
9. A camshaft 41 rotatably supported via 40;
The head cover 13 is provided with a plurality of rocker arms 43 that are swingably supported by a rocker arm shaft 42 provided parallel to a camshaft 41, and the end of the camshaft 41 is connected to the camshaft driving means 4.
It is connected to the crankshaft 1 via 4. The camshaft driving means 44 includes a cam driven gear 45 which is rotatably mounted on the end of the camshaft 41 and a cam driven gear 45 which is rotatably mounted on the end of the camshaft 41, and a cam driven gear 45 which is arranged at a position between the generator 21 and the piston 8 in the direction of the crankshaft 1. A cam drive gear 46 formed on the crankshaft 1 and both gears 4
5.46, and as the crankshaft 1 rotates, the camshaft 41 is rotated via the chain 47. And each rocker arm 43
is engaged with a cam 41a formed on the camshaft 41, and is also engaged with an intake/exhaust pulp (not shown) that opens and closes an intake/exhaust passage communicating with the combustion chamber 11.

In such an intake/exhaust device 12, like a known engine,
The rotation of the camshaft 42 in synchronization with the crankshaft 1 opens and closes the intake and exhaust valves via the rocker arm 44, thereby performing intake and exhaust air into the combustion chamber 11.

Incidentally, in this engine E, as shown in the first diagram, the generator 14, the camshaft drive means 44, the piston 8, and the drive means 2
The generator 14, the camshaft drive means 44, the piston 8, and the clutch device 7 are arranged in order along the crankshaft 1 from one end to the other end at approximately equal intervals and as close as possible. are arranged at substantially equal intervals in the axial direction of the crankshaft 1 from one end position to a position near the other end thereof.

In addition, in FIG. 1, 4 is a clutch cover that covers the clutch device 7 and is attached to the crankcase 2. In FIGS. 1 and 2, 49 is a primary balancer for reducing the primary vibration of the engine E. A weight 50 (hereinafter referred to as a negative balancer 50), and a pair of secondary balancer weights 51 (hereinafter referred to as a secondary balancer 5) for reducing secondary vibrations of the engine E.
1).

As shown in FIGS. 1 and 2, the primary balancer 50 is integrally provided at the end of the hollow shaft 30 in the crankcase 2 at a position near the clutch device 7, and is connected to the main shaft through the hollow shaft 30. 5 so as to be rotatable around it.

The secondary balancer 51 is mounted on a hollow shaft 53 that is rotatably supported on the subshaft 6 via a needle bearing 52 at a position opposite to the hollow shaft 30 in the crankcase 2, as shown in FIGS. It is provided integrally and is rotatably supported by the subshaft 6 via the hollow shaft 53. The hollow shaft 53 is connected to the hollow shaft 53 via a driven gear 54 provided integrally therewith and a drive gear 55 provided integrally with the hollow shaft 30 and meshed with the driven gear 54 at a gear ratio of 1:2. It is connected.

Therefore, as shown in the second figure, the primary balancer 50 is rotated together with the hollow shaft 30 via the driving means 28 in the opposite direction at a constant speed in conjunction with the crankshaft 1, and the secondary balancer 51 is , the hollow shaft 30 is rotated in the same direction at twice the speed of the crankshaft 1 in conjunction with the hollow shaft 53 via a driving gear 55 and a driven gear 54.

In FIG. 2, the balancer device 49 further includes a rotatable balancer shaft 56 arranged parallel to the main shaft 5 on the side opposite to the main shaft 5 with the crankshaft 1 in between, and a primary balancer 57 integrated therewith. and a secondary balancer 58 rotatably supported on the balancer shaft 56. A secondary balancer 58 is provided integrally with the drive gear 15a formed on the outer circumferential surface of the crank web 15 and the secondary balancer 58 to rotate in the opposite direction at a constant speed. It is made to rotate in the opposite direction at twice the speed by interlocking with the crankshaft 1 via a driven gear 60 meshed with the crankshaft 15a.

Further, in FIGS. 1 and 2, reference numeral 61 denotes a spindle 62 connected to a speed change pedal (not shown) like in a known engine.
This is a speed change drive device that changes the rotation speed of the subshaft 6 by changing the meshing combination of the speed change gear train 4 of the transmission device 3 via a shift drum 63 and a shift fork 64.

Next, a motorcycle equipped with the engine E having such a configuration will be described with reference to FIGS. 1, 3, and 4.

In Figures 3 and 4, F is the body frame on which the engine E is mounted, Wf is the front wheel suspended from the head pipe h of the body frame F via the front fork f, and Wr is the swing arm at the rear of the body frame F. This is the rear wheel suspended via a hydraulic shock absorber.

The vehicle body frame F includes an upper frame F1 and a front frame F2 extending diagonally downward from the head pipe h as shown in the third figure, and a 7-shaped frame extending from the lower end of the front frame F2 toward the rear as shown in the fourth figure. The lower frame F,,F extended into the mold.

And the rain frame F1. F: + rear end and upper frame F
, and the rear end portions of the carrier frames F, , F.

, rear frames F, , F, and a width direction frame F provided in the vehicle width direction between them, and a rear frame F, , F,
A seat frame Fs extends rearward.

The engine E is operated as shown in FIGS. 3 and 4, with its crankshaft 1 facing in the vehicle width direction, and with the generator cover 37 and the clutch cover 48 positioned on the left and right sides of the vehicle body frame F, respectively. Lower frame F ffr
An engine hanger 2 supported on the Fz and integrally provided at the front and rear of the crankcase 2 as shown in the fourth figure.
a and 2b are fixed to the front frame F2 and the width direction frame F via mounting members a and b, respectively, and a drive sprocket 34 attached to the subshaft 6 is a chain extending in the front and rear direction as shown in the third figure. It is connected to the rear wheel Wr via 35. At this time, the vehicle body center line C in the vehicle width direction of this motorcycle is parallel to the axis X of the piston 8 as shown in the first diagram by appropriately setting the positional relationship between the rear wheel Wr and the drive sprocket 34. , and is located approximately at the center between the axis X and the camshaft driving means 44.

Therefore, as shown in the first diagram, the piston 8 and the clutch device 7 are located on the right side of the vehicle body center line, and the generator 14 and the camshaft drive means 44 are located on the left side of the vehicle body center line, and as described above. These generators 14 and camshaft drive means 44
, the pistons 8 and the clutch device 8 are arranged in order from one end position to a position near the other end at approximately equal intervals in the axial direction of the crankshaft l, so that the generator 14 and the clutch device 7 The distance from line C is -.

As shown in FIGS. 1 and 4, the amount of left and right overhang of the engine E with respect to the vehicle body center line C is the amount that the generator cover 37 at the position of the generator 14 and the clutch cover at the position of the clutch device 7 are. 48, but as mentioned above, the distances of the generator 14 and clutch device 7 from the vehicle body center line C are -, so the amount of protrusion on the left and right sides of the engine E is approximately equal. There is.

In this way, in this motorcycle, the amount of engine E protruding to the left and right is approximately equal, so the rider can support his/her legs in an appropriate position and ride in a posture suitable for driving. , Also, when installing a fairing,
There is no need to provide an unnecessary gap between the fairing and the engine E, and the fairing can be placed close to both sides of the engine E, thereby making it possible to make the motorcycle smaller.

Further, the engine hangers 2a and 2b are attached to the mounting members a and b in a state where the axis X of the piston 8, which is the center of vibration of the engine E, is spaced from the vehicle body center line C in the vehicle width direction, as shown in FIG. It is fixed to the front frame F2 and the width direction frame F5 via the axial center of the piston 8, and is provided on the dividing plane Y of the crankcase 2 located between the axis X of the piston 8 and the vehicle body center line C. The vibrations at the vibration center of the engine E are not directly transmitted to the position of the vehicle body frame F on the vehicle body center line C, and therefore the vibrations of the vehicle body frame F due to the vibrations of the engine E are reduced, and the riding comfort is improved.

In the engine E of this embodiment, as shown in the first diagram, fins 65 are formed on the outer peripheral surfaces of the cylinder 9 and the cylinder head 10. By increasing the amount of protrusion and decreasing the amount of protrusion of the clutch device 7, the amount of protrusion of the cylinder 9 and cylinder head 10 from the vehicle body center line C can also be adjusted to the left and right distances as shown in FIG. It is formed so that.

(Effects) As is clear from the above description, according to the motorcycle equipped with the single-cylinder engine of the present invention, the camshaft drive means of the engine is provided between the piston and the generator in the axial direction of the crankshaft, By installing the engine so that the center line of the vehicle body is located between the axis of the piston and the camshaft drive stage, the generator and clutch device provided near both ends of the crankshaft and the center of the vehicle body The engine can be configured so that the distance from the line is equal to the road distance, and the amount of left and right protrusion of the engine in the vehicle width direction with respect to the center line of the vehicle body is made the same to improve the riding posture of the driver. I can do it.

Furthermore, since there is a gap between the vehicle body center line and the piston axis, which is the vibration center of the engine, vibrations at the engine vibration center are not directly transmitted to the vehicle body at a position on the vehicle body center line. Vibrations transmitted from the engine to the vehicle body can be reduced, and the riding comfort of the motorcycle can be improved.

[Brief explanation of drawings]

1 and 2 are an explanatory longitudinal sectional view and an explanatory cross sectional view, respectively, of an example of a single-cylinder engine for a motorcycle of the present invention, and FIG. 3 is a side view of a motorcycle equipped with the engine,
FIG. 4 is a sectional view taken along the line TV-IV in FIG. 2. 1...Crankshaft 5...Main shaft 7...Clutch device 9...Cylinder 14...Generator 41...Camshafts 50, 51...Balance way E...Engine X...・Piston axis center 3...Transmission device 6...Subshaft 8...Piston 12...Intake/exhaust device 28...Driving means 44...Camshaft driving means C...Center of vehicle body line

Claims (1)

[Claims] 1. A generator is provided near one end of a crankshaft that drives the camshaft of the intake/exhaust device via a camshaft drive means, and a generator is provided near one end of the crankshaft that drives the camshaft of the intake/exhaust device via a camshaft drive means, and the generator is installed in the vicinity of one end of the crankshaft that drives the camshaft of the intake/exhaust device via the camshaft drive means. A driving means that is interlocked with the crankshaft via a clutch device is provided near the other end of the crankshaft, and a piston that is slidable within a cylinder in a direction orthogonal to the crankshaft is provided at an intermediate portion of the crankshaft. In a motorcycle equipped with a connected single-cylinder engine, the camshaft driving means of the engine is provided between the piston and the generator in the axial direction of the crankshaft, and the engine drives the crankshaft along the vehicle width. 1. A motorcycle equipped with a single-cylinder engine, characterized in that the motorcycle is mounted so that the center line of the vehicle body in the vehicle width direction is positioned between the axes of the camshaft drive means and the piston. 2. A balancer weight that is rotated in conjunction with the crankshaft via the drive means is rotated around one of the main shaft and subshaft of the transmission at a position near the clutch. 2. A motorcycle equipped with a single-cylinder engine according to claim 1, wherein the motorcycle is movably supported.