JP3034544B2 - Motorcycle kick pedal device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a kick pedal device which is a starting device of a motorcycle.

(Prior art) Conventionally, the above kick pedal device has been disclosed in
There is a thing indicated by the gazette.

According to the above publication, a vehicle body frame includes a main frame extending rearward and downward from a head pipe, and a vertically elongated main frame extending downward from a rear end of the main frame and pivotally supporting a rear arm below the main frame. The vehicle includes a rear arm bracket and a cross member that connects the left and right rear arm brackets to each other.

An engine crankcase is provided in front of the rear arm bracket, and a power transmission case connected to the rear of the crankcase is provided near the front of the rear arm bracket. A kick shaft extending in the vehicle width direction is supported so as to be rotatable around its axis, a base of one end is supported by the kick shaft, and the other end extends upward from the base and is stored. Is provided, and the kick pedal is rotatable rearward and downward about the axis of the kick shaft.

Then, place a foot on the upper end of the kick pedal, step on the kick pedal vigorously, and rotate the kick pedal backward and downward, cranking is performed and the engine is started. ing.

By the way, in the above-mentioned conventional configuration, if the front and rear dimensions of the rear arm bracket are made wider to improve the strength of the rear arm bracket for pivotally supporting the rear arm, the lower front part of the rear arm bracket is supported by the pivot shaft. Will be approached in the front-rear direction to the base of the kick pedal that has been set, so that the turning trajectory of the base when the kick pedal is turned will be the front part of the lower part of the rear arm bracket and the vehicle body side view. As a result, the base portion may come into contact with the lower front portion of the rear arm bracket.

Therefore, the shaft end of the kick shaft supporting the base is projected outward in the vehicle width direction, whereby the base is positioned outside the vehicle body than the outermost surface at the lower part of the rear arm bracket, whereby It is conceivable that the base does not contact the lower part of the rear arm bracket.

(Problems to be Solved by the Invention) However, as described above, when the base of the kick pedal is located outside the lowermost outer surface of the lower part of the rear arm bracket in the vehicle width direction, the kick pedal including the base is There is a possibility that the above-mentioned protruding portion may protrude outward and hinder the operation of the rider during traveling. This is particularly undesirable in the case of a trial vehicle that requires accurate and agile operation.

(Purpose of the Invention) The present invention has been made in view of the above circumstances, and it is intended that the kick pedal protrudes outward in the vehicle width direction even when the strength of the rear arm bracket is to be improved. An object of the present invention is to suppress the movement and ensure a smooth movement of a rider during traveling.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a vehicle body frame 2 includes a main frame 4 extending rearward and downward from a head pipe 3, and a rear end of the main frame 4. And a pair of vertically long left and right rear arm brackets 7, 7 extending downwardly from below and pivotally supporting the rear arm 12 so as to be swingable up and down, and a cross member 8 for connecting the left and right rear arm brackets 7, 7 to each other. With
While the swinging end of the rear arm 12 supports the rear wheel 18,
Engine 25 in front of the left and right rear arm brackets 7,7
The crankcase 26 is disposed near the front of the left and right rear arm brackets 7,7.
6 and a power transmission case 48 connected to the rear of the power transmission case 48. The power transmission case 48 is disposed outside the power transmission case 48 facing one of the left and right sides in the vehicle body width direction.
Drive wheel 33 supported by the rear wheel and the rear wheel facing the one side
A driven chain wheel 34 disposed outside the rear wheel 18 and attached to the rear wheel 18; and a transmission chain 35 wound around the drive wheel chain 33 and the driven wheel chain 34.
A kick shaft 49 whose axis extends in the width direction of the vehicle body is supported by the 48 so as to be rotatable around the axis, and the kick shaft 49 is provided on the outer side of the power transmission case 48 facing the other side opposite to the one side. A kick pedal 50 is disposed and has a base 51 at one end supported by the kick shaft 49 and the other end extending upward from the base 51 to be in a retracted posture. A kick pedal device for a motorcycle which is rotatable rearward and downward about the axis of 49. 1) The outer surface of the main frame 4 and the outer surface of the crankcase 26 when viewed from the front of the vehicle body. The kick pedal 50 in the retracted position is positioned more inward in the vehicle width direction than the virtual surface 71 connecting the kick pedal 50 and at least a part of the kick pedal 50 is connected to the outer surface of the main frame 4 and the crank in the vehicle width direction. Case
26) a recess 55 is formed in the lower front outer edge of the rear arm bracket 7 on the other side of the left and right rear arm brackets 7, 7; The turning locus of the base portion 51 when the pedal 50 is turned is made to pass through the recess 55. 3) The cross member 8 is located near the recess 55 in a side view of the vehicle body. It is in.

(Operation) The operation of the above configuration is as follows.

When a power transmission chain 35 for transmitting power from the engine 25 to the rear wheel 18 is disposed outside a power transmission case 48 facing one of the left and right sides in the vehicle width direction, 1) a vehicle front view The kick pedal 50 in the stowed position is positioned inward in the vehicle width direction with respect to a virtual surface 71 connecting the outer surface of the main frame 4 and the outer surface of the crankcase 26 on the other side opposite to the one side. Let me do it.

Therefore, the rider's legs while traveling are
The legs are prevented from coming into contact with the kick pedal 50 when approaching from the outside so as to straddle the outer surfaces of the crankcase 26 and the crankcase 26.

In addition, at least a portion of the kick pedal 50 is connected to the outer surface of the main frame 4 and the crankcase 26 in the width direction of the vehicle body.
It is located between the outer surface of the.

For this reason, it is prevented that the kick pedal 50 enters too far inward in the vehicle width direction.

Therefore, as described above, the operability of the kick pedal 50 that is operated from the outside in the vehicle body width direction is excellent while the rider's legs during running are prevented from contacting the kick pedal 50. Will be kept.

2) A recess 55 is formed at the lower front outer edge of the rear arm bracket 7 on the other side of the left and right rear arm brackets 7 and 7 when the kick pedal 50 is rotated. The rotation trajectory of the base 51 passes through the recess 55.

For this reason, in order to improve the strength of the rear arm bracket 7, by increasing the front-rear dimension of the rear arm bracket 7, the front portion of the lower portion overlaps with the rotation locus of the base 51 of the kick pedal 50 in the side view of the vehicle body. Even if
When the kick pedal 50 rotates, the kick pedal 50 including the base 51 can be positioned on the inner side in the vehicle width direction, as long as the rotation trajectory of the base 51 passes through the recess 55.

Therefore, as described above, even when the strength of the rear arm bracket 7 is to be improved, the rider's legs during running are prevented from contacting the kick pedal 50.

By the way, when the recess 55 is formed in the rear arm bracket 7 as described above, it is considered that the strength of the rear arm bracket 7 is reduced.

On the other hand, as described above, when the transmission chain 35 that transmits power from the engine 25 to the rear wheel 18 is disposed outside the power transmission case 48 facing one side, the left and right rear arm brackets are used. It is considered that the rear arm bracket 7 on one side of 7, 7 receives a larger load than the rear arm bracket 7 on the other side because the power transmission chain 35 described above is known.

Therefore, since the transmission chain 35 is known as compared with the rear arm bracket 7 on one side, the rear arm bracket 7 on the other side is considered not to receive a larger load.
The recess 55 is formed at the bottom.

Therefore, the recess 55 is provided to reduce the strength of the rear arm bracket 7, but is provided without any hindrance to the load on which the transmission chain 35 is known.

3) A cross member 8 for connecting the left and right rear arm brackets 7, 7 to each other is located near the recess 55 in a side view of the vehicle body.

For this reason, if the recess 55 is formed in the rear arm bracket 7 as described above, it is considered that the strength of the rear arm bracket 7 around the recess 55 is reduced. However, by using the cross member 8, the recess 55 is formed. A decrease in strength due to the formation is suppressed.

Therefore, in order to prevent the kick pedal 50 from projecting outward in the vehicle width direction as described above, the rear arm bracket has a simple configuration in which the cross member 8 is used while the recess 55 is formed. 7 can ensure a predetermined strength.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3, reference numeral 1 denotes a motorcycle as a trial vehicle, and reference numeral 2 denotes a body frame of the motorcycle. In addition, the arrow Fr in each figure has shown the front of the motorcycle 1. FIG. Also, the left and right described below refer to the direction toward the vehicle body width direction toward the front.

The vehicle body frame 2 includes a head pipe 3 constituting a front end thereof, and left and right main frames 4, 4 extending rearward and downward from the head pipe 3. Each of the main frames 4 has a box shape having a vertically long section. And extends substantially linearly from the head pipe 3 in a plan view.

Further, rear arm brackets 7 extend vertically downward from the rear ends of the main frames 4, respectively, and the rear arm brackets 7 are wide in the front-rear direction.
The upper and lower portions of the left and right rear arm brackets 7, 7 are firmly connected to each other by tube-shaped upper and lower cross members 8, 9, respectively. And, between these upper and lower cross members 8 and 9 in the vertical direction, a pivot shaft 11 is provided under the left and right rear arm brackets 7 and 7, and the rear arm 12 is swingable up and down on the pivot shaft 11. So pivoted.

Down tubes 13 extend downward from the front ends of the main frames 4 below the main frames 4 and 4, respectively.

A front fork 15 is pivotally supported by the head pipe 3 so as to be steerable. And this front fork 15
The front wheel 16 is supported at the lower end of the front fork 15
The handle 17 is attached to the upper end of.

On the other hand, a rear wheel 18 is supported on the swinging end of the rear arm 12. Reference numeral 19 denotes a shock absorber. The shock absorber 19 absorbs an impact transmitted from the rear wheel 18 to the vehicle body frame 2 via the rear arm 12.

An engine 25 is provided below the left and right main frames 4,4. The engine 25 is a two-stroke single-cylinder engine, and a power transmission 27
And a cylinder 28 protrudes from the upper surface of the crankcase 26 toward the upper front.

A drive chain wheel 33 is supported by the power transmission device 27, and a driven wheel wheel 34 is attached to the rear wheel 18, and a transmission chain 35 is wound around the both wheel chains 33, 34.

A seat rail 37 protrudes from the rear ends of the left and right main frames 4, 4 toward the rear upper side. The seat rail 37 is firmly supported by the rear arm bracket 7 by a pair of left and right back stays 38.

On the other hand, a carburetor 40 is connected to an intake port formed on the rear surface of the cylinder 28, and a fuel tank 42 for supplying fuel to the carburetor 40 is provided. A cover 43 that covers the fuel tank 42 and the seat rail 37 is provided, and the upper surface of a portion of the cover 43 supported by the seat rail 37 is a seat 44. 45 is an exhaust pipe.

In FIG. 1, a crankcase 26 of the engine 25 is shown.
Is disposed in front of the left and right rear arm brackets 7, 7, and the power transmission device 27 has a power transmission case 48 connected to a rear portion of the crankcase 26. The power transmission case 48 is provided for the left and right rear arm brackets 7, 7. It is arranged near the front.

In FIG. 2, the drive chain wheel 33 is disposed outside the power transmission case 48 facing one side (left side toward the front of the vehicle body) of the left and right sides in the vehicle body width direction. Supported on case 48. Further, the driven chain wheel 34 is disposed outside the rear wheel 18 facing the one side, and is attached to the rear wheel 18. Further, with the above configuration, the transmission chain 35 wound around the drive wheel 33 and the driven wheel 34 is disposed on one side of the power transmission case 48 and the rear wheel 18, respectively.

A kick shaft 49 whose axis extends in the vehicle width direction is supported at the rear portion of the power transmission case 48 so as to be rotatable around the axis. A kick pedal 50 is disposed outside the power transmission case 48 facing the other side (the right side toward the front of the vehicle body) opposite to the one side.
The kick pedal 50 is attached to a shaft end of a kick shaft 49 protruding rightward from the rear in a storage posture.

The base 51, which is one end of the kick pedal 50 in the storage posture, is pivotally supported by a boss 52 attached to the end of the kick shaft 49 by a pivot shaft 53, and the other end is separated from the base 51. It extends forward and upward, and its extending end forms a tread portion 54. When the kick pedal 50 is not used, such as when the motorcycle 1 is running, the kick pedal 50 is in the above-described storage position as shown by a solid line in FIG. It can be stored along.

The kick pedal 50 is arranged around the axis of the pivot shaft 53,
The kick shaft 49 is rotatable toward the outside of the vehicle body, and is rotatable rearward and downward (arrow A in FIG. 1) around the axis of the kick shaft 49.

When the kick pedal 50 is used, first, as shown by a two-dot chain line in FIG. Protrude outward.

When the foot is placed on the tread portion 54 from the above state, and the tread portion 54 is stepped vigorously in the direction of arrow A in the figure to rotate the kick pedal 50 rearward and downward, the kick pedal 50 As shown by the one-dot chain line in the figure, it rotates together with the kick shaft 49, cranking is performed, and the engine 25 is started.

1 and 4, in the rear arm bracket 7 on the other side (right side) of the left and right 7,7, that is, in the rear arm bracket 7 corresponding to the base 51 of the kick pedal 50 in the front-rear direction. A portion of the lower front outer edge is chamfered to form a recess 55. And the first
As shown by the dashed line in the drawing and the solid line in FIG. 4, the locus of the base 51 when the kick pedal 50 is rotated is
It is supposed to pass inside. For this reason, the base 51 enters into the recess 55, and the shaft end of the kick shaft 49 and the base 51 are located on the inner side in the vehicle width direction by that much.

In the above case, the cross member 8 is located near the recess 55 in the vehicle body side view.

1 and 4, the engine 25, the power transmission device 27, and the kick pedal 50 will be described in more detail.

The engine 25 has a crankshaft 57 and a connecting rod 58. On the other hand, the power transmission device 27 has a main shaft 59 and a counter shaft 60 supported by a power transmission case 48. The driven side of a wet multi-plate clutch 61 is mounted on the main shaft 59, and a small shaft mounted on a crank shaft 57. The gear 64 and the large gear 63 which is the driving side of the clutch 61 are meshed. Further, a gear type transmission means 66 is provided between the main shaft 59 and the counter shaft 60, and when the clutch 61 is connected, the power of the engine 25 is transmitted from the crankshaft 57 to the small gear 64, The power is transmitted to the drive chain wheel 33 through the large gear 63, the clutch 61, and the speed change means 66.

A crankshaft 57 is linked to the kick pedal 50 as follows. That is, a drive gear 67 is attached to the kick shaft 49 so as to be slidable only in the axial direction, and an intermediate gear 68 is supported on the counter shaft 60 so as to freely rotate. A driven gear 69 meshing with the intermediate gear 68 is mounted on the drive side of the clutch 61.

When the kick pedal 50 is not used, the kick pedal 50 is urged by a spring 70 to rotate upward. Then, from this state, if the stepping portion 54 is depressed as described above against the spring 70, only at this time, the drive gear 67 slides in the axial direction and meshes with the intermediate gear 68. The power is driven gear 69, large gear 63, small gear
The cranking is transmitted to the crankshaft 57 via 64 to perform cranking.

In FIG. 1 and FIG. 3, when the kick pedal 50 is not used and stored in a storage position below the main frame 4 along the outer surface of the vehicle body, the kick pedal 50 As shown in FIG. 3, the other side (right side)
It is positioned more inward in the vehicle width direction than a virtual surface 71 connecting the outer surface of the main frame 4 and the outer surface of the crankcase 26. That is, the kick pedal 50 is largely prevented from protruding outward in the vehicle width direction as a whole, so that the running rider can operate smoothly without being disturbed by the kick pedal 50.

4 to 6, a flywheel 72 is attached to the crankshaft 57.
Is a steel disc 75 connected to the crankshaft 57 by a key 74
have. The disk 75 has sufficient strength to withstand the centrifugal force, and the disk 75 has openings 76 at equal intervals in the circumferential direction.
Are formed in each of these openings 76.
77 are fitted respectively. Also, each weight 77 has an opening 76
A sheet metal holding plate 79 sandwiching both surfaces of the disk 75 is provided so as not to fall out of the disk 75, and these are connected to each other by rivets 80.

(Effects of the Invention) According to the present invention, the body frame extends rearward and downward from the head pipe, and the main frame extends downward from the rear end of the main frame, and the rear arm extends vertically below the main frame. A pair of vertically-long left and right rear arm brackets pivotally supported so as to be swingable, and a cross member for connecting the left and right rear arm brackets to each other, wherein a swinging end of the rear arm supports a rear wheel; A power transmission case connected to the rear of the crankcase is provided near the front of the left and right rear arm brackets, and one of the left and right sides in the vehicle body width direction. A drive chain wheel disposed outside of the power transmission case and supported by the power transmission case; And a transmission chain that is disposed on the outside of the rear wheel and is attached to the rear wheel, and a transmission chain that is wound around the drive wheel and the driven wheel. A kick shaft extending in the width direction of the vehicle body is supported so as to be rotatable around its axis, and is disposed on the outer side of the power transmission case 48 facing the other side opposite to the one side. A kick pedal whose base is supported by the kick shaft and whose other end extends upward from the base and has a retracted posture is provided, and the kick pedal is turned rearward and downward around the axis of the kick shaft. A kick pedal device for a motorcycle which is made movable. 1) When viewed from the front of the vehicle body, the kick pedal device is located more inward in the vehicle width direction than a virtual surface connecting the outer surface of the main frame and the outer surface of the crankcase. Position the kick pedal in the above storage position It is allowed.

For this reason, when the legs of the traveling rider approach from the outside so as to straddle the outer surfaces of the main frame and the crankcase, the legs are prevented from contacting the kick pedal.

Therefore, the smooth movement of the rider while traveling is ensured,
This is particularly beneficial when the motorcycle is a trial vehicle.

In addition, at least a part of the kick pedal is located between the outer surface of the main frame and the outer surface of the crankcase in the width direction of the vehicle body.

For this reason, it is prevented that the kick pedal enters too much inward in the vehicle width direction.

Therefore, as described above, the operability of the kick pedal operated from the outside in the vehicle width direction is maintained satisfactorily, while preventing the rider's legs during running from contacting the kick pedal. It is.

2) A recess is formed in the lower front outer edge of the rear arm bracket on the other side of the left and right rear arm brackets, and the rotation locus of the base when the kick pedal is rotated is formed. It passes through the above recess.

For this reason, in order to improve the strength of the rear arm bracket, by increasing the front-rear dimension of the rear arm bracket, the front part of the lower part overlaps with the rotation locus of the base of the kick pedal in a side view of the vehicle body. Also, when the kick pedal is rotated, the kick pedal including the base can be positioned inward in the vehicle width direction, as long as the rotation locus of the base passes through the recess.

Therefore, even when the strength of the rear arm bracket is to be improved as described above, the rider's legs during running are suppressed from coming into contact with the kick pedal, and the effect is further remarkable.

By the way, when the recess is formed in the rear arm bracket as described above, it is considered that the strength of the rear arm bracket is reduced.

On the other hand, as described above, when a drive chain or a transmission chain that transmits power from the engine to the rear wheels is disposed outside the power transmission case facing one side, the left and right rear arm brackets are used. Of the above rear arm brackets on one side, the power transmission chain described above is different from the rear arm bracket on the other side,
It is expected to receive a larger load.

Therefore, the rear arm bracket on the other side, which is supposed to receive a larger load than the rear arm bracket on one side and is not considered to receive a larger load, forms the recess.

Therefore, although the above-mentioned recess reduces the strength of the rear arm bracket 7, it is provided without any problem in strength against the load on the transmission chain.

3) The cross member is located near the recess when viewed from the side of the vehicle body.

For this reason, if the recess is formed in the lower front portion of the rear arm bracket as described above, it is considered that the strength of the rear arm bracket around the recess is reduced, but the recess is formed by using the cross member. The decrease in strength due to the action is suppressed.

Therefore, in order to suppress the kick pedal from protruding outward in the vehicle body width direction as described above, a simple configuration of using a cross member while forming a recess,
The predetermined strength can be ensured by the rear arm bracket.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a partial right side view of a motorcycle, FIG. 2 is a left side view of the entire motorcycle, FIG.
FIG. 4 is a sectional view taken along line III-III of FIG. 2, and FIG.
FIG. 5 is a partial enlarged view of FIG. 4, and FIG. 6 is a sectional view taken along line VI-VI of FIG. 1 ... motorcycle, 2 ... body frame, 4 ... main frame, 7 ... rear arm bracket, 8 ... cross member, 12 ... rear arm, 18 ... rear wheel, 25 ... engine,
26 …… Crank case, 33 …… Drive chain wheel, 34 …… Drive chain wheel, 35 …… Transmission chain, 48 …… Power transmission case, 49…
… Kick shaft, 50 …… Kick pedal, 51 …… Base, 55 ……
Recess.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62K 11/00-11/14 B62K 19/28 B62M 3/08 F02N 3/04

Claims (1)

(57) [Claims] 1. A main body frame extending rearward and downward from a head pipe, and a main frame extending downward from a rear end of the main frame so that a rear arm is swingable up and down. A left-right pair of left and right rear arm brackets pivotally supported, and a cross member connecting the left and right rear arm brackets to each other; a swinging end of the rear arm supports a rear wheel; A power transmission case connected to the rear of the crankcase is disposed near the front of the left and right rear arm brackets, and the power transmission case is directed to one of the left and right sides in the vehicle width direction. A drive chain wheel which is disposed on the outside of the rear wheel and is supported by the power transmission case, and an outside of the rear wheel facing the one side. And a driven chain attached to the rear wheel and a transmission chain that is wound around the drive wheel and the driven wheel. A kick shaft whose axis extends in the vehicle width direction is provided on the power transmission case. It is supported so as to be rotatable around its axis, and is disposed outside the power transmission case facing the other side opposite to the one side, and the base of one end is supported by the kick shaft. A kick of a motorcycle in which a kick pedal having an end portion extending upward from the base and having a storage posture is provided, and the kick pedal is rotatable rearward and downward around the axis of the kick shaft. In the pedal device, 1) the kick pedal having the stowed posture is positioned inward in the vehicle width direction with respect to a virtual surface connecting the outer surface of the main frame and the outer surface of the crankcase on the other side when viewed from the front of the vehicle. , And the width direction of the vehicle Positioning at least a portion of the kick pedal between the outer surface of the main frame and the outer surface of the crankcase; 2) a lower front portion of the rear arm bracket of the left and right rear arm brackets having the other side. A concave portion is formed in the outer edge so that the turning locus of the base when the kick pedal is rotated passes through the concave portion. 3) The cross member is located near the concave portion in a side view of the vehicle body. Is located on a motorcycle kick pedal device.