JPH01237280A - Motorcycle - Google Patents

Abstract

PURPOSE:To ensure a large-volume article housing space on the lower portion of a saddle by providing a damper unit nearly in a horizontal condition between a body frame and a supporting arm and providing the saddle on the upper portion of the supporting arm interposing a space for housing articles in between. CONSTITUTION:A power unit 15 including an engine and a transmission as units is vertically swingably linked to a pivot shaft 14 on the rear end of the nearly horizontal low position of a body frame 2 provided between a front wheel 8f and a rear wheel 8r. This power unit 15 is placed adjacent to one side of the rear wheel in such a way that nearly the whole unit 15 comes within the plane of projection on the side of the rear wheel 8r. The axle of the rear wheel 8r is linked to the output member of the power unit 15. A damper unit 18 for damping down the up/down swinging of a supporting arm is installed nearly in a horizontal condition between the body frame 2 and the supporting arm 13, and a saddle 6 is provided on the upper portion of the supporting arm 13 interposing a space 26 for housing articles in between. Thereby, a large-volume articles housing space 26 can be formed on the lower portion of the saddle 6 without being nearly hindered by the power unit 15 and damper unit 18.

Description

Detailed Description of the Invention A6 Object of the Invention (1) Industrial Application Field The present invention relates to a motorcycle, in particular, to a motorcycle in which an engine and a transmission are mounted as a unit at the rear end of a body frame disposed between front wheels and rear wheels. The present invention relates to an improvement in a motorcycle in which a power unit formed by a cylindrical body is pivotally connected so as to be able to swing upwardly, a rear wheel hub is connected to an output member of the power unit, and a saddle is disposed above between the front and rear wheels.

(2) Conventional technology The motorcycle of this type is, for example,
This method is known as disclosed in Japanese Patent No. 48.

(3) Problems to be Solved by the Invention Conventionally, in these types of motorcycles, the engine of the power unit is placed in front of the rear wheel, and a damper is installed between the second engine and the saddle to buffer the vertical swing of the power unit. Since the unit is disposed in an upright position, it is difficult to secure a large volume of article storage space below the saddle because it is obstructed by the engine and damper unit.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a motorcycle that can secure a large volume of article storage space below the saddle.

B8 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides an engine and A power unit formed by unitizing a transmission is pivotally connected so as to be able to swing up and down, and this power unit is arranged adjacent to one side of the rear wheel so that almost the entire unit fits within the lateral projection plane of the rear wheel. The axle of the rear wheel is connected to the output member of the rear wheel, a damper unit is interposed in a substantially horizontal state between the vehicle body frame and the support arm to dampen the vertical swing of the support arm, and an article storage space is created above the support arm. The first feature is that the saddle is arranged in a straight line.

In addition to the above-mentioned features, a second feature of the present invention is that auxiliary equipment is attached to a substantially horizontal low portion of the vehicle body frame, and a floor panel is provided to cover the auxiliary equipment from above. .

Furthermore, in addition to the first or second feature, the present invention has a third feature in that a cleaner chamber is formed in the support arm in which a cleaner element for filtering intake air of the engine is installed.

(2) Effects According to the first feature of the present invention, a large volume of article storage space can be secured below the saddle without being substantially obstructed by the power unit and damper unit.

Further, according to the second feature, it is possible to reduce the reduction in the article storage space due to auxiliary machinery, and it is also possible to lower the center of gravity of the vehicle. Moreover, since the auxiliary equipment is covered by the floor panel, it does not spoil the appearance of the vehicle.

Furthermore, according to the third feature, the support arm also serves as the cleaner case of the engine air cleaner, and there is no need to provide a dedicated installation space for it, so it is possible to eliminate the reduction in the article storage space due to the air cleaner. can.

(3) Examples Embodiments of the present invention will be described below with reference to the drawings.

First, let us begin with a first embodiment of the present invention. Figures 1 and 2
In the figure, a body frame 2 of a scooter type motorcycle 1 is shown.
A head pipe 4 that pivotably supports the front fork 3 in a steerable manner, a pair of left and right main pipes 5.5 extending rearward from both left and right sides of the head pipe 4, and a mutual relationship between these main pipes 5.5. It has a saddle post 7 that is connected to the tied rear end and supports the saddle 6, a front wheel 8f is pivotally supported at the lower end of the front fork, and a rod-shaped steering handle 9 is attached to the upper end of the front fork. Ru.

Each of the main pipes 5 includes a down chave 5a that slopes steeply toward the rear from the head pipe 4, a low portion 5b that extends horizontally from the rear end, and a pillar portion 5 that rises from the rear end.
The left and right lower parts 5b, 5b are connected to each other by a plurality of front and rear cross members 10.11.

Further, rearwardly protruding plackets 12, 12 are respectively fixed to the rear ends of the left and right lower parts 5b, 5b, and a support arm 13 is connected to these via a pivot shaft 14 so as to be swingable in the vertical direction.

The support arm 13 is formed into an L-shape by a base 13a extending in the left-right direction between both brackets 12.12, and an arm 13b extending rearward from the left end of the base 13a. The rear end 8" is arranged,
A power unit 15 is connected to the rear end of the arm portion 13b. Moreover, this power unit 15 is arranged adjacent to one side of the rear wheel 8r so that substantially the entirety thereof is within the side projection plane of the rear wheel 8r, and drives the rear wheel 8r.

Thus, the power unit 1-15 and the rear end 8r can vertically swing around the pivot shaft 14 integrally with the support arm 13. In order to buffer the vertical movement of the support arm 13, the support arm 13 is placed directly above the pivot shaft 14.
Both ends of a damper unit 18 in a substantially horizontal state are connected to a damper mounting portion 16 projecting from the front surface of the base portion 13a and a damper mounting portion 17 projecting from the upper surface of the cross member 11 at the rear.

Both ends of a U-shaped fender stay 19 that surrounds the rear end 8r and the power unit 15 in a substantially horizontal direction are tied to the left and right pillar parts 5c, 5c, and cover the upper surface of the rear wheel 8r and the power unit 15 to this. The rear fender 20 is attached.

Furthermore, a battery 21 and a fuel tank 22 as auxiliary equipment are installed in front and back between the left and right lower portions 5b, 5b. These panteri 21 and fuel tank 2
A floor panel 23 covering the upper surface of 2, this floor panel 2
3 and a front cover 24 that surrounds the front fork, and a substantially truncated conical shape that rises from the rear end of the floor panel 23 and the fender stay 19 and reaches the lower edge of the saddle 6 that occupies a position above the support arm 13. A carrier cover 25 is fixed to the vehicle body frame 2. In particular, the interior of the rear cover 25 is a luggage compartment 26, and a lid for opening and closing the luggage compartment is provided at an appropriate location on the rear cover 25. A large volume can be given to the luggage compartment 26 without interfering with the power unit 15 and damper unit 7 .

In FIGS. 3 to 5, the power unit 15
The power unit 15 is composed of a unitized two-stroke engine 30 and a planetary gear transmission 31, and most of the transmission Ja 31 is housed in a bowl-shaped web 32 at the rear end 8''. The casing 33 consists of an inner case 33a disposed within the web 32, an intermediate case 33b bolted to its left end, and an outer case 33c bolted to its left end. A transmission chamber 34 that accommodates the internal mechanism of the transmission 31 is defined by the inner case 33c and the intermediate case 33b, and a crank chamber 36 that accommodates the crankshaft 35 of the engine 30 is defined by the intermediate case 33b and the outer case 33c. will be accomplished.

Further, the left half portion 13 that constitutes the support arm 13 is provided in the middle case 33b and the outer case 33c! and right half 1
3r is integrally molded.

The rear wheel 8r includes a hub 38 fixed to the web 32 via a brake drum 37, and an axle 39 spline-coupled to the hub 38. Supported via .40.

The crankshaft 35 of the engine 30 is coaxially supported with the axle 39 by the intermediate case 33b and the outer case 33c via bearings 41. support through.

The cylinder block 43 of the engine 30 is adjacent to an example of the rear wheel 8r and is connected to the intermediate case 33b and the outer case 33c with a forward or backward tilted posture, and an ignition plug 45 is provided at the upper end of the cylinder block 43. Cylinder head 44 is attached. A piston 47 connected to the crankshaft 35 via a connecting rod 46 is slid into the cylinder hole 43a of the cylinder block 43.

The cylinder block 43 has an intake boat 48 open at the front and an exhaust port 49 at the rear, and a carburetor 51 is connected to the intake boat 48 via a reed valve 50.
An exhaust pipe 52 is connected to the exhaust port 49 .

Furthermore, an air cleaner 53 is connected to the intake path entrance of the carburetor 51. This air cleaner 53 is the left and right halves 134 of the support arm 13! , 13r, and has a T-shaped opening 55 on the upper surface, and a cleaner chamber 54 that is removably installed in the cleaner chamber 54 and has an opening 54 connected to the entrance chamber 54.
It is composed of a cleaner element 56 which is divided into two chambers, a and an outlet chamber 54b, and a T-shaped cover plate 57 which is detachably attached to the support arm 13 to close the opening 55.

The cover plate 57 includes an inlet pipe 58 that communicates the interior of the vehicle body frame 2 under atmospheric pressure with the inlet chamber 54a, and an outlet chamber 54b.
is connected to an intake pipe 59 that communicates with the intake path of the carburetor 51.

Therefore, during operation of the engine 30, relatively clean air that has passed through the interior of the vehicle body frame 2 flows into the inlet chamber 54a, is filtered by the cleaner element 56, moves to the outlet chamber 54b, and passes through the intake pipe 59 to the carburetor 51. The mixture enters the air, becomes an air-fuel mixture, and is inhaled into the engine 30. Configuring the air cleaner 53 within the support arm 13 in this manner eliminates the need to provide a dedicated installation space for the air cleaner, which is advantageous in increasing the volume of the luggage compartment 26.

The engine 30 is also provided with an electric starter 60 and a kick starter 61.

The electric motor of the electric starter 60, that is, the starter motor 6
2 is attached to the front surface of the power unit 15 within the housing recess 63 at the rear of the support arm 13.

The output gear 64 of this starter motor 62 is connected to the transmission chamber 34.
The control shaft 65 is engaged with a reduction gear 66 of a control shaft 65 disposed therein. The starter motor 62 and control shaft 65 are arranged parallel to the crankshaft 35, and the control shaft 65 is rotatably supported by the inner case 33a and the intermediate case 33b.

One end of this control shaft 65 is located in the transmission chamber 3 on the opposite side from the rear wheel 8r.
A known inertial meshing mechanism 67 with a built-in overrunning clutch and a pinion 68 that is moved forward and backward by the meshing mechanism 67 are provided on the projection. A starting ring gear 69 waiting to mesh with the starting ring gear 69 is carved on the outer periphery of a starting rotary 70 fixed to the outer end of the crankshaft 35.

Therefore, when the control shaft 65 is rotated through the output gear 64 and the reduction gear 66 by normal rotation of the starter motor 62, the meshing mechanism 67 is activated to advance the pinion 68 to the meshing position with the starting ring gear 69. Therefore, the crankshaft 35 can be cranked via the pinion 68 and the starting ring gear 69, and the engine 30 can be started.

After starting, the pinion 68 is driven from the starting ring gear 69, so the return movement of the meshing mechanism 67 causes the pinion 6 to
8 can be moved backward and removed from the starting ring gear 69.

The link type starting device 61 will be described later.

The transmission 31 is relatively rotatably supported by an axle 39 and meshes with an input shaft 72 connected to the crankshaft 35 via a centrifugal clutch 71 and a sun gear 73 formed on the human-powered shaft 72. a plurality of planetary gears 74;
An output carrier 75 as an output member that rotatably supports these planetary gears 74 and is spline-coupled to the axle 39, a ring gear 76 whose internal teeth mesh with the plurality of planetary gears 74, and a ring gear 76 fixed to the control shaft 65. A control gear 77 that meshes with external teeth of a ring gear 76 is provided. The ring gear 76 is riveted to a holding plate 7 that is relatively rotatably supported by the input shaft 72, and this holding plate 78 serves to prevent each planetary gear 74 from coming off.

The centrifugal clutch 71 includes a drive plate 80 fixed to the crankshaft 35, a clutch shoe 81 pivotally supported by the drive plate 80 so as to be swingable in the radial direction, and the clutch shoe 8.
1 and a clutch drum 82 that surrounds the input shaft 72 and is fixed to the input shaft 72, and the clutch shoe 81 is urged in the contraction direction by a return spring (not shown).

Thus, when the crankshaft 35 is rotating at idle, the clutch shoe 81 is held in the retracted position by the force of its return spring.
Although it does not contact the clutch drum 82, when the number of rotations of the crankshaft 35 exceeds a predetermined value, the clutch shoe 81 expands due to the action of centrifugal force and comes into pressure contact with the clutch drum 82, and the centrifugal clutch 71 becomes clutch-on, and the crankshaft 35
power is transmitted to the human power shaft 72.

In FIG. 4A, when the input shaft 72 rotates in the direction of arrow a (forward rotation direction of the rear wheel 8r) due to power transmission, the sun gear 73 rotates the planetary gear 74. Along with this, the planetary gear 74 tries to rotate and revolve,
Rotational torques in opposite directions a and b are applied to the output carrier 75 and the ring gear 76.

At this time, the starter motor 62 is controlled to be energized in the reverse direction, and this reverse torque is transmitted to the ring gear 76 via the control shaft 65 and the control gear 77, and the transmitted torque and the rotational torque of the ring gear 76 in the b direction are If the ring gear 76 is kept stationary by balancing, the output carrier 75 will be driven in the direction b by the revolution of the planetary gear 74, and the driving torque will be transmitted to the axle 39, that is, the rear wheel 8r, and drive it forward. drive in the direction of rotation. In this embodiment, at this time, the speed ratio (reduction ratio) between the input shaft 72 and the output carrier 75 becomes the minimum. That is, it is in the top state.

Further, by increasing the amount of current supplied to the starter motor 62 in the reverse direction and increasing its reverse torque, the ring gear 76 is rotated in the b direction, that is, in the opposite direction to the output carrier 75, and the rotation speed is increased. , the speed ratio (reduction ratio) between the input shaft 72 and the output carrier 75 can be increased steplessly over a wide range.

It should be noted that when the starter motor 62 is operating, the control shaft 65 is rotated in the opposite direction to that when the engine is started, so the meshing mechanism 67 will not operate.

The electric control circuit of the starter motor 62 will be explained with reference to FIG.

The engine rotation speed sensor 85 outputs a signal e according to the rotation speed of the engine 30, the throttle sensor 86 outputs a signal th according to the throttle valve opening of the carburetor 51, and the motor rotation speed sensor 87 outputs a signal e according to the rotation speed of the engine 30. 62, the reference rotation speed signal generator 88 outputs a signal i corresponding to the set rotation speed below the idle rotation speed of the engine 30, and the starter switch sensor 90 outputs a signal m corresponding to the rotation speed of the engine 30, i.e. A signal S is output when the power switch of the electric starter f60 is turned on.

The signals e and th are input to a speed ratio determining circuit 89, and the circuit 89 determines the signals e and t according to a map prepared in advance.
Determine the gear ratio according to h and generate the corresponding signal r
Output.

The signals m and r are input to a first comparator 91, and the comparator 91 sends a signal p corresponding to the difference in the re-input signal amounts to a motor drive circuit 92.

Further, the signals e and i are input to a second comparator 93, and when the comparator 93 determines that the engine speed is less than a predetermined idling speed from the difference in the re-input signal amounts, it outputs a signal i. .

The signals s and 1 are input to an AND circuit 94, which sends a signal n to the motor drive circuit 92 when the manual inputs are performed simultaneously.

When the motor drive circuit 92 receives the signal p, it energizes the starter motor 62 in the reverse direction according to the amount of the signal, thereby controlling the ring gear 76 of the transmission 31 as described above. The gear ratio determined by the gear ratio determination circuit 89 is thus applied to the transmission 31 for automatic adjustment.

Further, upon receiving the signal n, the motor drive circuit 92 drives the starter motor 62 in the normal rotation direction. Therefore, when the engine speed is less than the idle speed, that is, when the starter switch is turned on while the engine is stopped, the starter motor 62 can be rotated in the forward direction to start the engine.

In this way, using one electric motor 62 for starting and shifting is extremely effective in simplifying the structure, reducing weight, reducing costs, and the like.

Referring again to FIG. 4, the kick type starting device 61 has a kick shaft 102 connected to a kick pedal arm 100 at one end, a sector gear 101 fixedly attached to the other end, and whose intermediate portion is supported by the intermediate case 33b, and the sector gear 101. A small gear 103 that meshes with the inner case 33 is integrally formed, and both ends are connected to the inner case 33.
a and an intermediate shaft 104 supported by the intermediate case 33b;
A large-diameter driving helical gear 105 is rotatably and immovably supported on the intermediate shaft 104, and a large-diameter driving helical gear 105 is engaged with the driving helical gear 105 and rotatably and axially movably supported on the boss 82a of the clutch drum 82. It has a small diameter driven helical gear 106. Clutch teeth 107 are formed on one side of the drive helical gear 105, and clutch teeth 108 that can engage with the clutch teeth 107 are formed.
A clutch body 109 having a clutch body 109 is slidably fitted to the intermediate shaft 104 via a helical spline 110.

A pinch spring 111 is attached to the clutch body 109 to provide rotational resistance due to friction. do not rotate together, but can move together in the axial direction. Further, a clutch pawl 113 that penetrates the end wall of the clutch drum 82 is fixed to the driven hemical gear 106, and this clutch pawl 113 projects against the drive plate 80 as the driven hemical gear 106 advances and retreats in the axial direction. The provided clutch pawl 11
4.

Thus, when the kick operation of the kick pedal 100 rotates the sector gear 101 via the kick shaft 102 and rotates the intermediate shaft 104 in a predetermined direction via the small gear 103, rotational resistance is applied by the pinch spring 111. The clutch body 109 is sent to the drive helical gear 105 side by the helical spline 110, and the clutch m 108 of the clutch formation 109 is engaged with the clutch teeth 107 of the drive helical gear 105, so that the rotation of the intermediate shaft 104 is controlled by the clutch body 109. The signal is transmitted from the drive helical gear 105 to the driven helical gear 106 to drive it. At this time, the pinch spring 111 generates slippage between the clutch body 109 and the rotation of the clutch body 109 so as not to interfere with its rotation.

Driven helical gear 106 by driving helical gear 105
According to the drive in a predetermined direction, the driven helical gear 106 is sent toward the drive plate 80 side by the thrust generated at the meshing portion of both gears 105 and 106, and the clutch pawl 113 of the driven helical gear 106 is connected to the clutch of the drive plate 80. Since it is engaged with the pawl 114, the rotation of the driven helical gear 106 is transmitted to the crankshaft 35 via the drive plate 80 and cranks it. In this way, the engine 30 can be started.

When the kick pedal 100 is moved back, the clutch teeth 107, 108 and the clutch pawl 113 are
．． 114 are spaced apart from each other, so that the crankshaft 3
5 to the kick shaft 102 is cut off.

In addition, when the centrifugal clutcher 1 is in the clutch-on state, the clutch,
The driven helical gear 106 is rotated from the Natram 82 via the clutch pawl 113, but the clutch rJ108,1
09 are spaced apart from each other, the drive helical gear 105
The kick shaft 10 simply rotates idly on the intermediate shaft 104.
No power transmission to 2 occurs.

FIG. 7 shows a second embodiment of the present invention, which has the same configuration as the previous embodiment except that the saddle post 7 has a shape in which the middle part thereof is curved to the rear of the vehicle. Parts corresponding to those in the previous embodiment are given the same reference numerals.

According to this embodiment, a large-volume luggage compartment 26 can be formed below the saddle 6 without being interfered with by the saddle post 7.

FIG. 8 shows a third embodiment of the present invention, in which a substantially truncated conical rear cover 25 is provided with a partition wall 27 that partitions its interior 26 into two front and rear luggage compartments 26a and 26b. The rigidity of the main pipe 5 is increased, the saddle 6 is directly supported on the main pipe 5, and a saddle post is eliminated, and a battery 21 is attached to the rear of the main pipe 5. The front end of the saddle 6 is hinged to the rear cover 25 so that the front luggage compartment 26a can be opened and closed. Further, a lint 28 is provided on the rear surface of the rear cover 25 to open and close the rear luggage compartment 26b, allowing for example, a Hermeno (hermeno) h to be taken in and out. The rest of the structure is the same as that of the first embodiment, and in the drawings, parts corresponding to those of the first embodiment are given the same reference numerals.

According to this embodiment, the interior space of the carrier cover 25 can be utilized to the maximum extent as a luggage compartment, and the capacity of the fuel tank 22 under the floor panel 23 can be increased.

C6 Effects of the Invention As described above, according to the first feature of the present invention, the engine and transmission are integrated into a unit at the rear end of the substantially horizontal lower part of the vehicle body frame disposed between the front wheels and the rear wheels. The power unit is pivotally connected so as to be able to swing up and down, and the power unit is arranged adjacent to an example of the rear wheel so that almost the entire power unit fits within the lateral projection plane of the rear wheel, and the axle of the rear wheel is connected to the output member of the power unit. A damper unit is interposed between the vehicle body frame and the support arm in a substantially horizontal state to buffer the vertical swing of the support arm, and a saddle is provided above the support arm with an article storage space. Therefore, it is possible to secure a large volume of article storage space under the saddle without being substantially obstructed by the power unit and damper unit, thereby increasing convenience for the user.

According to the second feature, the auxiliary equipment is attached to the substantially horizontal lower part of the vehicle body frame, and the floor panel is arranged to cover the auxiliary equipment from above, so that the article storage space by the auxiliary equipment is reduced. It is possible to obtain a small reduction in weight and lower the center of gravity of the vehicle. Moreover, the auxiliary equipment is covered by the floor panel, and the appearance of the vehicle can be improved without providing a special cover member.

Furthermore, according to the third feature, since a cleaner chamber in which a cleaner element for filtering intake air of the engine is installed is formed in the support arm, there is no need to provide a space dedicated to the engine air cleaner. This makes it possible to eliminate the reduction in the article storage space and to simplify the structure.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a side view of the motorcycle, FIG. 2 is a perspective view thereof,
Figure 3 is a sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a cross-sectional view taken along the line I in Figure 3.
4A is a diagram illustrating the operation of the transmission, FIG. 5 is a perspective view of the power unit and the air cleaner in a disassembled state, FIG. 6 is an electric control circuit diagram of the starter motor, and FIG.
The figure shows a second embodiment of the invention, a side view similar to FIG. 1, and FIG. 8 is a side view similar to that of FIG. 8, showing a third embodiment of the invention. l...Motorcycle, 2...Body frame, 5b...
・Low part, 8 teeth...Front wheel, 8"...Rear wheel, 13...
・Support arm, 14... Pivot shaft, 15... Power unit, 18... Damper unit, 21... Battery CIn), 22... Fuel tank (auxiliary equipment),
23... Floor panel, 26... Luggage compartment (goods storage space), 30... Engine, 31... Transmission, 39
...Axle, 75...Middle rear (output member) Fig. 4A

Claims (3)

[Claims] (1) A power unit consisting of an engine and a transmission as a unit is pivotally connected to the rear end of the generally horizontal low part of the vehicle body frame disposed between the front wheels and the rear wheels so as to be able to swing vertically. The power unit is arranged adjacent to one side of the rear wheel so that the entire part is within the lateral projection plane of the rear wheel, and the axle of the rear wheel is connected to the output member of this power unit, and a support arm is provided between the vehicle body frame and the support arm. 1. A two-wheeled motor vehicle, characterized in that a damper unit is installed in a substantially horizontal state to buffer the vertical vibration of the motorcycle, and a saddle is disposed above a support arm with an article storage space. (2) In the vehicle described in paragraph (1), auxiliary equipment is attached to a substantially horizontal lower part of the vehicle body frame, and a floor panel is arranged to cover the auxiliary equipment from above. Two-wheeled vehicle. (3) In the automatic vehicle described in paragraph (1) or (2), the support arm is provided with a cleaner chamber in which a cleaner element for filtering intake air of the engine is installed. Two-wheeled vehicle.