JP4814601B2 - Motorcycle - Google Patents

Description

  The present invention relates to an improvement of an engine support structure in a motorcycle.

2. Description of the Related Art A motorcycle is known in which a body frame is extended rearward from a head pipe, and an engine is attached to the body frame via an engine support (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 5-47029 (Fig. 3)

  In FIG. 3 of Patent Document 1, the engine mounting structure includes a bolt insertion pipe 10 in which left and right main frames constituting a vehicle body frame are connected by a cross pipe 5 and fixed through and perpendicular to the axis of the cross pipe 5. The bolt 12 is inserted into the through hole 10a at the center of the bottom wall of the bolt insertion pipe 10, and the engine 6 is suspended by tightening the bolt 12 in the screw hole 11 provided at the upper rear side of the engine 6.

  The bolt insertion pipe 10 and the bolt 12 are attached from the obliquely rear upper side to the obliquely front lower side of the vehicle body. That is, the axial direction of the bolt 12 is attached with an angle with respect to the longitudinal axis of the vehicle body.

  By the way, as the rotational speed of the engine 6 increases and the output becomes high, the pulling force that the drive chain pulls the engine 6 backward increases. At this time, since the axial direction of the bolt 12 has an angle with respect to the longitudinal axis of the vehicle body, a strong force is applied to the bolt 12 in a direction different from the axial direction.

Normally, the strength of the bolt is strongest against the force in the axial direction, and weak against the force in a direction different from the axial direction.
Since the axial direction of the bolt 12 has an angle with respect to the longitudinal axis of the vehicle body, for example, when the output of the engine is increased and the pulling force pulling the engine backward due to the driving reaction force is increased, In some cases, it may be desirable to increase the engine's support strength against longitudinal forces.
Therefore, a technique for increasing the support strength of the engine against the pulling force that pulls the engine rearward is desired.

  An object of the present invention is to provide a motorcycle including an engine support portion that increases the support strength of the engine against the pulling force toward the rear of the engine.

According to the first aspect of the present invention, the vehicle body frame extends rearward from the head pipe, a rear swing arm is swingably attached to the rear portion of the vehicle body frame, a rear wheel is provided at the rear portion of the rear swing arm, and the rear wheel The engine for driving the engine is attached to the body frame via a plurality of engine support portions, and the plurality of engine support portions support an engine support portion that supports the rear lower portion of the engine crankcase and a rear upper portion of the engine crankcase. A drive sprocket is mounted between the engine support that supports the rear lower part of the crankcase and the engine support that supports the rear upper part of the crankcase in the height direction at the rear of the crankcase. the motorcycle with a drive shaft of the engine to be, the body frame, engine from a head pipe A pair of left and right frames that pass above the vehicle and extend obliquely downward to the rear of the vehicle, and are placed between the pair of left and right frames so that they are at the same height as the upper part of the crankcase in a side view of the vehicle a cross pipe is provided with a support frame extending from the connecting portion between the pair of left and right frame this cross pipe rearward, engine support portion for supporting the rear upper portion of the crankcase, the vehicle body longitudinal from the rear of the engine The structure is such that a bolt is attached along the shaft, and the drive shaft is disposed closer to the engine support portion supporting the rear lower portion of the crankcase than the engine support portion supporting the rear upper portion of the crankcase .

In the invention according to claim 2, the cross pipe is characterized Rukoto provided in an upper position than the pivot shaft which supports the rear swing arm.
According to a third aspect of the present invention, there is provided an engine support portion that extends the holding stay from the cross pipe side to the front of the vehicle and holds the rear upper portion of the crankcase via a fastening member that extends in the vehicle width direction with the holding stay. Features.

In the invention according to claim 1, at least one engine support portion has a structure in which a bolt is attached along the longitudinal axis of the vehicle body from the rear of the engine.
Since the longitudinal direction of the vehicle body and the direction of the pulling force that pulls the engine rearward are substantially parallel, and the bolt is disposed substantially parallel to the pulling force, the support strength of the bolt with respect to the pulling force is maximized.

Since the support strength of the bolt with respect to pulling force is maximized, with respect to pulling force tending to move the engine in the longitudinal direction, it is possible to firmly support the engine.
As a result, it is possible to increase the support strength of the engine against an increase in the pulling force toward the rear of the engine.

  The invention according to claim 2 is provided with a cross pipe extending in the vehicle width direction at a position above the pivot shaft for stopping the rear swing arm. If the arrangement height of the cross pipe can be arranged at or near the center of gravity of the vehicle, it can be supported at an optimum position in the height direction of the engine.

Further, since at least one engine support portion is provided on the cross pipe extending in the vehicle width direction, the cross pipe can be supported at an optimum position in the engine width direction.
By supporting the engine at an optimal position in the height and width directions, the engine can be effectively supported. In addition, the integrity between the engine and the body frame can be further enhanced.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In the figure, “front”, “rear”, “upper”, “lower”, “left”, and “right” indicate directions viewed from the driver. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a saddle-ride type motorcycle according to the present invention. A motorcycle 10 includes a body frame 11, and a head pipe 12 provided at the front end of the body frame 11, and an engine from the head pipe 12 is shown. A pair of left and right upper frames 14 and 14 (only the reference numeral 14 on the front side is shown) that passes above 13 and extends obliquely downward rearward, and passes from the head pipe 12 to the front of engine 13 and extends obliquely downward. A pair of left and right down frames 15 and 15 (only front side reference numeral 15 is shown), seat rails 16 and 16 (only front side reference numeral 16 is shown) extending rearward from these upper frames 14 and 14, and these Support frames 17 and 17 for reinforcing the seat rails 16 and 16 (only the reference numeral 17 on the front side is shown) and the lower ends of the upper frames 14 and 14 The extended frames 18 and 18 (only the reference numeral 18 on the front side are shown) and the subframes 19 and 19 (the front side reference numerals) connecting the upper frames 14 and 14 and the down frames 15 and 15 above the engine 13. 19 is shown).

In the motorcycle 10, a front fork 21 is attached to a head pipe 12 so as to be steerable, a front wheel 22 is attached to a lower end of the front fork 21, a steering handle 23 is attached to an upper portion of the front fork 21, and rear portions of upper frames 14 and 14 are mounted. The rear swing arms 25, 25 (only the reference numeral 25 on the front side is attached) are pivotably mounted through a pivot shaft 24 provided on the rear, and a rear wheel 26 is attached to the rear ends of the rear swing arms 25, 25, Rear cushion units 27, 27 (only the reference numeral 27 on the front side is shown) are provided between the support frames 17 , 17 and the rear swing arms 25 , 25 . Reference numerals 28 and 28 (only the reference numeral 28 on the front side are shown) are reservoir tanks attached to the rear cushion units 27 and 27.
Further, a headlamp 29 as a lighting device is attached to the front fork 21.

The main body of the engine 13 includes a crankcase 41, a cylinder block 42 raised from the crankcase 41, a cylinder head 43 provided at the top of the cylinder block 42, and an oil pan 44 that covers the lower side of the crankcase 41. Become.

  An air cleaner unit 45 is disposed above the cylinder block 42 and connected to the rear part of the cylinder block 42 via a throttle body (not shown) at the rear part of the cylinder block 42 to constitute an intake system. Further, exhaust pipes 46 and 46 (only the reference numeral 46 on the front side is shown) are connected to the front part of the cylinder block 42, and silencers 47 and 47 (on the front side) are connected to the rear ends of the exhaust pipes 46 and 46 extending rearward. Only the reference numeral 47 is shown.) Is connected to form an exhaust system.

The support part of the engine 13 will be described.
A first engine support portion 51 that supports the front portion of the crankcase 41 at the lower end portion of the down frame 15, a second engine support portion 52 that supports the rear portion of the crankcase 41 below the upper frame 14, and the pivot shaft 24 3rd engine support part 53 which hold | maintains the rear upper part of the crankcase 41 via the lower part 14b of the upper flame | frame 14 upwards.

Step brackets 61L and 61R (only the reference numeral 61L on the front side are shown) extend from the extended frames 18 and 18 provided at the lower end of the upper frame 14 to the rear of the vehicle, and the width direction of the vehicle extends from these step brackets 61L and 61R. The occupant steps 62L and 62R (only the reference numeral 62L on the near side is shown) that are footrests are extended outward.
Reference numeral 64 denotes a shift operation unit that performs a shift change.

The drive system will be described.
A drive shaft 71 of the engine 13 is provided at the rear portion of the crankcase 41 , a drive sprocket 72 is attached to the drive shaft 71, a driven sprocket 74 is attached to the rear wheel axle 73, and the drive sprocket 74 is driven between the driven sprocket 74 and the drive sprocket 72. The chain 75 is wound around and the driving force of the engine 13 is transmitted to the rear wheel 26. Reference numeral 76 denotes a front wheel axle.

  In the figure, 79 is a front brake unit, 81 is a rear brake unit, 82 is a fuel tank, 83 is a fuel pump, 84 is an oil cooler, 85 is a battery, 86 is a front fender, 87 is a rear cover member, 88 is a meter, 89 is It is an occupant seat attached to the seat rail 16.

  That is, the motorcycle 10 has a vehicle body frame 11 extending rearward from the head pipe 12, a rear swing arm 25 is swingably attached to the rear portion of the vehicle body frame 11, and a rear wheel 26 is attached to the rear portion of the rear swing arm 25. In addition, the engine 13 for driving the rear wheel 26 is attached to the vehicle body frame 11 via a plurality of engine support portions 51 to 53.

FIG. 2 is a side view of a main part of the motorcycle according to the present invention, and is a view for explaining two engine support portions 52 and 53 among the three engine support portions 51 to 53.
The second engine mount 52 is attached to extend frames 18, 18 downwardly from the bottom 14b, 14b of the upper frames 14, the lower end 18b of these extended frame 18, 18, 18b to the engine 13 The rear lower part of the cylinder block 42 is attached.

Further, the third engine support portion 53 hangs a cross pipe 91 between the left and right upper frames 14, 14 and above the pivot shaft 24 that stops the rear swing arms 25, 25. A cylindrical member 93 having a through hole 92 is attached along the axis, a boss portion 96 having a female screw portion 95 is provided on the crankcase 41 side of the engine 13, and the hole positions of the through hole 92 and the female screw portion 95 are aligned. A bolt 97 is inserted into 92 to support the engine 13.

  A step bracket 102 is attached to the extension frame 18 behind the fastening members 101, 101, and a speed change operation unit 103 is provided on the step bracket 102.

  The speed change operation unit 103 includes, as main elements, a speed change pedal 105 having a substantially square shape, a joint member 107 attached to the other end 105b of the speed change pedal 105, and a link member 108 attached to the joint member 107. The operation of the shift pedal 105 is transmitted to the link member 108 via the joint member 107 and the force applied to the shift pedal 105 is transmitted to the transmission shaft 111 of the engine 13.

  That is, the motorcycle 10 includes an engine support portion 50, and at least one engine support portion of the engine support portions 50 is structured to be attached with a bolt 97 along the longitudinal axis of the vehicle body from the rear of the engine 13. And

  By attaching the bolt 97 along the longitudinal axis of the vehicle body from the rear side of the engine 13, the fastening surface of the bolt 97 provided in the support portion of the engine 13 is provided in a direction to receive the driving reaction force of the drive chain 75. .

  The vehicle body frame 11 includes a cross pipe 91 extending in the vehicle width direction at a position above the pivot shaft 24 that stops the rear swing arm 25, and an engine support portion 53 is provided on the cross pipe 91.

  FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2, and a notch 121 is formed by partially notching the upper part of the cross pipe 91, and a cylindrical member 93 is fitted into the notch 121. Fix between the two by welding.

  4 is a cross-sectional view taken along line 4-4 of FIG. 3. A cylindrical member 93 having a through hole 92 is attached to the cross pipe 91, and a boss portion 96 having a female thread portion 95 is attached to the crankcase 41 side of the engine 13. The engine 13 is supported by aligning the positions of the through-hole 92 and the female screw portion 95, inserting a bolt 97 into the through-hole 92 from the rear to the front, and tightening the female screw portion 95.

  FIG. 5 is an exploded perspective view of the engine mounting portion according to the present invention. The third engine mounting portion 53 is provided with a boss portion 96 having a screw portion 95 for rearward opening at the rear portion of the engine 13. A cylindrical member 93 is attached to a cross pipe 91 provided on the side of the vehicle body frame 11 at the position 96, and a bolt 97 is attached from the rear of the vehicle body.

The operation of the engine support described above will be described next.
The third engine support portion 53, which is one of the engine support portions 50, has a structure in which a bolt 97 is attached from the rear of the engine 13 along the longitudinal axis of the vehicle body.

The longitudinal direction of the vehicle body and the direction of the pulling force for pulling the engine 13 backward are substantially parallel, and the bolt 97 is arranged substantially parallel to the pulling force, so that the strength of the bolt 97 with respect to the pulling force is maximized. . Since the strength of the bolt 97 with respect to the pulling force is maximized, the engine 13 can be effectively and firmly supported against the pulling force that tries to move the engine 13 in the longitudinal direction.
As a result, it is possible to improve the support strength of the engine 13 against an increase in the pulling force to the rear of the engine 13.

In the present embodiment, the third engine support portion 53 is provided at two places on the cross pipe 91, but may be three places, five places, or one place, and the number thereof is arbitrary.
Further, the position of the engine support 50 having a structure for attaching the bolt 97 along the longitudinal axis of the vehicle body from the rear of the engine 13 may be in front of or side of the engine 13 and is not limited to the rear of the engine 13.

  Furthermore, the engine support 50 having a structure for attaching the bolt 97 along the longitudinal axis of the vehicle body from the rear of the engine 13 can be directly attached to the vehicle body frame 11 without using the cross pipe 91.

  FIG. 6 is a diagram showing another embodiment of FIG. 2, and the difference from FIG. 2 will be mainly described. In addition to the engine support portion 50 having a structure for attaching a bolt 97 along the longitudinal axis of the vehicle body from the rear of the engine 13, A holding stay 122 extends forward from the body frame 11 side above the pivot shaft 24, and another engine support portion 104 that holds the rear upper part of the crankcase 41 via the fastening member 101 is provided on the holding stay 122.

  FIG. 7 is a diagram showing another embodiment of FIG. 5. The description will focus on the points different from FIG. 5. The cylindrical member 93 provided on the cross pipe 91 and the boss portion 96 provided on the engine 13 side are arranged along the longitudinal axis of the vehicle body. Similarly, an ear member 123 is attached to the front of the cross pipe 91, a holding stay 122 is extended to the ear member 123 via bolts 98, 98, and a hole 124 is formed at the front end of the holding stay 122. The hole 124 is aligned with a support boss 126 having a hole 125 formed in the rear portion of the crankcase 41, and a threaded shaft member 127 is passed through the hole 125 and the hole 124 through the support boss 126. An end portion 127 t of the member 127 is fixed with a nut 128.

The bolt 97 attached between the engine 13 and the vehicle body along the longitudinal axis of the vehicle body can minimize the displacement of the engine 13 in the longitudinal direction of the vehicle body.
Further, the threaded shaft member 127 attached between the engine 13 and the vehicle body 11 along the vehicle body width direction can suppress the displacement of the engine 13 in the vehicle body width direction to a minimum.

  According to the first aspect of the present invention, the engine support portion configured to mount the bolt along the longitudinal axis of the vehicle body is not necessarily provided on the cross pipe extending in the vehicle width direction. For example, it may be provided directly on the left and right main frames.

  The present invention is suitable for motorcycles.

1 is a side view of a motorcycle according to the present invention. 1 is a side view of a main part of a motorcycle according to the present invention. FIG. 3 is a view taken in the direction of arrow 3 in FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a disassembled perspective view of the engine attachment part which concerns on this invention. It is another Example figure of FIG. It is another Example figure of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame, 12 ... Head pipe, 13 ... Engine, 24 ... Pivot shaft, 25 ... Rear swing arm, 26 ... Rear wheel, 50 ... Engine support part, 91 ... Cross pipe, 97 ... Bolt.

Claims (3)

Extending from the head pipe (12) of the vehicle body frame (11) to the rear, the rear to attach the rear swing arm (25) pivotably in the vehicle body frame (11), a rear wheel to a rear portion of the rear swing arm (25) provided with a (26), mounted through a plurality of engine support portion (50) on the body frame of the engine (13) for driving the rear wheel (26) (11), said plurality of engine support portion (50) The engine support part (52) for supporting the rear lower part of the crankcase (41) of the engine (13) and the engine support part (53) for supporting the rear upper part of the crankcase (41) of the engine (13). And an engine support portion (52) for supporting a rear lower portion of the crankcase (41) of the engine (13) in a height direction at a rear portion of the crankcase (41). Wherein between the engine support portion for supporting the rear upper portion of the crankcase (41) (53), in a motorcycle including a driving shaft of the engine to the drive sprocket (72) is attached (71) and,
The vehicle body frame (11) includes a pair of left and right frames (14, 14) extending from the head pipe (12) above the engine (13) and extending obliquely downward to the rear of the vehicle, and the pair of left and right frames. A cross pipe (91) that is passed between (14, 14) and arranged at the same height as the top of the crankcase (41) in a side view of the vehicle, and the cross pipe (91) A support frame (17, 17) extending rearward from the connecting portion of the pair of left and right frames (14, 14);
Before SL engine support portion for supporting the rear upper portion of the crankcase (41) (53), and the structure for mounting the bolts (97) from the rear along the vehicle body longitudinal axis of the engine (13), said drive shaft (71 ) Is arranged closer to the engine support part (52) supporting the rear lower part of the crankcase (41) than the engine support part (53) supporting the rear upper part of the crankcase (41). Motorcycle to do. The cross pipe (91), a motorcycle according to claim 1, wherein the set kick upward position than the pivot shaft (24) for supporting the rear swing arm (25). A holding stay (122) is extended from the cross pipe (91) side to the front of the vehicle, and the rear upper part of the crankcase (41) is held by a holding member (101) extending in the vehicle width direction by the holding stay (122). The motorcycle according to claim 1 or 2, further comprising an engine support portion (104) for performing the operation.

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