JP2006123653A - Saddle riding vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the workability without applying the self weight of a rear cushion as a force in the direction of bending to a sliding section. <P>SOLUTION: An engine 20 is mounted on a car body frame 2, and a link mechanism 24 is provided between the car body frame 2 and a rear arm 21. The rear cushion 25 is supported by the engine case 29 of the engine 20 and the link mechanism 24, and rear wheels 23 are freely movably suspended vertically through the rear arm 21 for this saddle riding vehicle. The upper end of the rear cushion 25 is supported by the rear section 29a, which is also the upper section 29b, of the engine case 29, and the lower end of the rear cushion 25 is supported by the link of the link mechanism 24. The link of the link mechanism 24 is arranged at a lower position of a rear arm pivoting section 5g of the rear arm 21, and the sliding direction of the rear cushion 25 is approximately vertically arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a straddle vehicle including a rear suspension that suspends a rear wheel so as to be movable up and down via a rear arm, a link mechanism, and a rear cushion.

Conventionally, for example, a motorcycle as a saddle-riding vehicle has an engine mounted on a body frame, a link mechanism is provided between the body frame and the rear arm, and a rear cushion is supported by the engine case and the link mechanism of the engine. There is one that suspends the rear wheel so as to be movable up and down via a wheel (for example, Patent Document 1).
JP 2001-106155 A (pages 1 to 8 and FIGS. 1 to 3)

  In the motorcycle disclosed in this patent document, the longitudinal direction of the rear cushion is horizontal and the sliding direction is the same, and the weight of the rear cushion is applied as a force in the bending direction against the sliding portion. In addition, if the seal between the cylinder and the piston rod is weakened to reduce the resistance, it may cause oil leakage of the rear cushion.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a saddle-ride vehicle in which the weight of the rear cushion is not applied as a force in the bending direction to the sliding portion, and the operability is good. It is said.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

According to the first aspect of the present invention, an engine is mounted on a vehicle body frame, a link mechanism is provided between the vehicle body frame and the rear arm, a rear cushion is supported by the engine case and the link mechanism of the engine, A straddle vehicle that suspends a rear wheel to move up and down via a rear arm,
The upper end of the rear cushion is supported at the rear and upper part of the engine case, and the lower end of the rear cushion is supported by the link of the link mechanism,
The link of the link mechanism is disposed at a position below the rear arm pivot portion of the rear arm,
A straddle vehicle characterized in that a sliding direction of the rear cushion is arranged substantially vertically.

In a second aspect of the present invention, the rear portion of the engine case has a protruding portion that protrudes rearward from the rear arm pivot portion at a position above the rear arm pivot portion.
2. The straddle vehicle according to claim 1, wherein a mounting portion of the rear cushion is formed on the protruding portion.

According to a third aspect of the present invention, the rear portion of the engine case has a protruding portion that protrudes rearward from the concave portion at a position above the concave portion facing the rear arm pivotally supporting portion formed on the rear surface thereof.
2. The straddle vehicle according to claim 1, wherein a mounting portion of the rear cushion is formed on the protruding portion.

According to a fourth aspect of the present invention, a transmission main shaft that constitutes a transmission together with an output extraction shaft in the engine case is disposed above the output extraction shaft,
The straddle vehicle according to claim 2, wherein the protruding portion is formed in a transmission main shaft storage portion of the engine case.

  According to a fifth aspect of the present invention, the transmission mechanism of the transmission is disposed behind the transmission main shaft, and a protruding portion is formed by the transmission mechanism housing portion. Both.

According to a sixth aspect of the present invention, the transmission main shaft constituting the transmission together with the output take-out shaft in the engine case is disposed above the output take-out shaft,
2. The straddle vehicle according to claim 1, wherein the mounting portion of the rear cushion is formed in the vicinity of the transmission main shaft storage portion of the engine case.

According to a seventh aspect of the present invention, the vehicle body frame has an extension portion that extends downward from the rear arm pivot portion,
The straddle vehicle according to claim 1, wherein the link is attached to the extension portion.

  According to an eighth aspect of the present invention, the extension portion extends further downward from an engine vehicle body side mounting portion positioned below the rear arm pivotal support portion of an engine vehicle body side mounting portion for mounting the engine to the vehicle body frame. The saddle-riding vehicle according to claim 7, wherein

  With the above configuration, the present invention has the following effects.

  According to the first aspect of the invention, the upper end of the rear cushion is supported at the rear and upper portion of the engine case, the lower end of the rear cushion is supported by the link of the link mechanism, and the link of the link mechanism is connected to the rear arm pivot portion of the rear arm. Since the rear cushion sliding direction is arranged substantially vertically, the rear cushion does not have its own weight applied as a force in the bending direction to the sliding portion, and the operability is good.

  According to the second aspect of the present invention, in addition to the first aspect, the rear portion of the engine case has a protruding portion protruding rearward from the concave portion at a position above the concave portion facing the rear arm pivot portion formed on the rear surface. And the rear cushion mounting part is formed in the protruding part, so that the rear cushion mounting part can be arranged relatively rearward, and the longitudinal direction of the rear cushion is vertical and the sliding direction is substantially vertical. Is easy.

  According to the third aspect of the present invention, in addition to the first aspect, the rear portion of the engine case has a protruding portion that protrudes rearward from the concave portion at a position above the concave portion facing the rear arm pivot portion formed on the rear surface. And the rear cushion mounting portion is formed on the protruding portion so that the rear cushion mounting portion can be disposed relatively rearward, and the longitudinal direction of the rear cushion is vertical and the sliding direction is substantially vertical. Is easy.

  According to the invention described in claim 4, in addition to claim 2 or claim 3, the transmission main shaft that constitutes the transmission together with the output take-out shaft in the engine case is disposed above the output take-out shaft, and the protruding portion Is formed in the transmission main shaft storage portion of the engine case, and the engine case can be used and the structure can be simplified when the rear cushion mounting portion is disposed upward.

  According to the fifth aspect of the present invention, in addition to the fourth aspect, the speed change mechanism of the transmission is disposed behind the speed change main shaft, and the protrusion is formed by the speed change mechanism housing portion, thereby forming the protrusion. The engine case can be used and the structure can be simplified.

  According to the sixth aspect of the present invention, in addition to the first aspect, the transmission main shaft constituting the transmission together with the output take-out shaft is disposed above the output take-out shaft in the engine case, and the mounting portion of the rear cushion is Since it is formed in the vicinity of the transmission main shaft storage portion of the engine case, the vertical dimension of the rear portion of the engine case is increased, and the degree of freedom in arrangement when the longitudinal direction of the rear cushion is vertical can be increased.

  According to the seventh aspect of the present invention, in addition to the first aspect, the vehicle body frame has an extension portion that extends downward from the rear arm pivot support portion, and the link is attached to the extension portion so that the link is attached to the rear arm pivot support portion. In the downward arrangement, the frame configuration is simple, and it is easy to make the longitudinal direction of the rear cushion vertical and the sliding direction substantially vertical.

  According to the eighth aspect of the invention, in addition to the seventh aspect, the extension portion extends further downward from the attachment portion located below the rear arm pivot portion among the attachment portions for attaching the engine to the vehicle body frame. As a result, the engine also acts as a rigid member, so that the link can be supported more firmly.

  Hereinafter, embodiments of the saddle-riding vehicle of the present invention will be described. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this. In this embodiment, a motorcycle is shown as a saddle-ride vehicle, but the present invention can be similarly applied to a motor tricycle, a buggy, or the like.

  1 is a side view of a motorcycle, FIG. 2 is a side view of a body frame, FIG. 3 is a plan view of the body frame, FIG. 4 is a perspective view of the body frame, and FIG. 5 is an enlarged plan view of a front side portion of the body frame. 6 is a cross-sectional view taken along line VI-VI in FIG. 5, FIG. 7 is an enlarged side view showing suspension of the engine and attachment of the rear cushion, FIG. 8 is a side view of the upper attachment portion of the rear cushion, and FIG. It is a plane of an upper attachment part.

  The motorcycle 1 of this embodiment has a body pipe 2 including at least a head pipe 3, a main frame 4 extending rearward from the head pipe 3, and a rear arm bracket 5 extending downward from a rear portion of the main frame 4. The main frame 4 has two frame portions 4a extending from the head pipe 3 to the left and right rear, and the rear portions of the two frame portions 4a extend downward to be connected to the left and right rear arm brackets 5. The lower part of the two frame parts 4a is formed with an engine body side mounting part 4b extending downward, and the rear part is formed with an engine body side mounting part 4c on the lower side. The rear arm bracket 5 has engine vehicle body side mounting portions 5e and 5f formed on left and right upper portions 5a and lower portions 5d.

  The rear arm bracket 5 has a seat rail attachment portion 5b and a back stay attachment portion 5c formed on the left and right upper portions 5a, a front side portion of the seat rail 6 is attached to the seat rail attachment portion 5b, and the back stay attachment portion 5c has a back portion. A stay 7 is attached, and the rear part of the seat rail 6 and the rear part of the back stay 7 are connected.

  As shown in FIGS. 2 to 6, the main frame 4 has two frame portions 4a extending from the head pipe 3 to the left and right sides, further bent and extending rearward, and the head pipes of the two frame portions 4a. In the connection portion, intake duct insertion openings 4a1 are formed on both the left and right sides. The main frame 4 extends from the head pipe side of the two frame portions 4 a to the left and right bent portions 4 a 2, and is connected to the first plate-like member 4 h that connects the left and right main frames and the pipe axis direction of the head pipe 3. The second plate member 4i extends rearward from the head pipe 3 and is connected to the first plate member 4h.

  In this embodiment, the first plate-like member 4h is disposed only on the lower side of the left and right frame portions 4a of the main frame 4, and the front side portion 4h11 of the first plate-like member 4h is the head pipe 3. The left and right side portions 4h12 are connected to the left and right frame portions 4a, and the rear side portion 4h13 is connected to the cross member 4h4. Further, the second plate-like member 4i is arranged so as to extend rearward from the rear center of the head pipe 3, and the front side portion 4i11 of the second plate-like member 4i is connected to the center of the rear portion of the head pipe 3, and the lower portion 4i12 is connected to the first plate-like member 4h, and the rear part 4i13 is connected to the central part of the cross member 4h4.

  The first plate-like member 4h has a plate-like portion 4h2 and a high-rigidity portion 4h3 having higher rigidity than the plate-like portion 4h2, and the high-rigidity portion 4h3 functions as a rib to further improve the rigidity. The high rigidity portion 4h3 is configured by connecting to the cross member 4h4.

  The first plate-like member 4h is disposed only on the lower side of the frame portion 4a and has a portion 4h1 extending in the height direction of the main frame 4. The first plate-like member 4h May be disposed only on the upper side of the frame portion 4a. As described above, the first plate-like member 4h has a portion extending from one side closer to the top to the other side, and the portion extending from one side to the other side functions as a rib to further improve the rigidity.

  Further, the first plate-like member 4h is arranged only on one side near the top and bottom of the main frame 4, and the side where the first plate-like member 4h is not arranged can be used as an arrangement place for other components, for example. Moreover, although the 1st plate-shaped member 4h is directly connected to the head pipe 3, you may connect indirectly via a mounting bracket etc.

  The second plate-like member 4i has a head pipe side length L10 that is substantially the same as the length L11 of the head pipe 3, extends backward from the center of the rear side of the head pipe 3, and is connected to the cross member 4h4. The rigidity around is further improved.

  The first plate-like member 4h and the second plate-like member 4i have a connecting portion 4j extending in the vehicle front-rear direction, and the main frame 4 is formed by the first plate-like member 4h and the second plate-like member 4i. The front side is highly rigid.

  In this way, at least the left and right bent portions 4a2 from the head pipe side of the main frame 4 are reinforced by the first plate-like member 4h and the second plate-like member 4i, and the rigidity around the head pipe is further improved. . Accordingly, sudden acceleration and deceleration and sudden turning may be performed, and deformation of the head pipe 3 of the main frame 4 can be suppressed even when twisting is applied in addition to force in the front-rear direction.

  A front fork 10 is pivotally supported on the head pipe 3, a steering handle 11 is provided at the upper end of the front fork 10, and a front wheel 12 is provided at the lower end. A fuel tank 13 is disposed at the upper part of the main frame 4, and a seat 14 is placed on the seat rail 6 behind the fuel tank 13. The fuel tank 13 is covered with a tank cover 13 a, and the fuel tank 13 is disposed above the engine 20.

  An engine 20 is suspended from the main frame 4 and the rear arm bracket 5. In this embodiment, the engine 20 is of a water-cooled four-cycle parallel four-cylinder type. The cylinder shaft is slightly inclined forward of the vehicle body, and an engine case 29 that houses the crankshaft 30 is directed in the vehicle width direction. The vehicle body frame 2 is suspended and supported.

  An exhaust pipe 80 is connected to the front side of the cylinder of the engine 20, the exhaust pipe 80 extends downward from the front side of the cylinder of the engine 20, and a muffler 81 is connected to the rear part thereof. An intake pipe 82 is connected to the rear side of the cylinder of the engine 20, an air cleaner 83 is connected to the intake pipe 82, and an intake duct 84 is connected to the air cleaner 83.

  As shown in FIG. 3, a pair of left and right air introduction openings 83a are formed on the front side of the air cleaner 83, and an air introduction opening 84a is formed on the front side and a pair of left and right air introduction openings 84a is formed on the rear side. An air discharge opening 84b is formed. A pair of left and right air introduction openings 83a of the air cleaner 83 and a pair of left and right air discharge openings 84b of the intake duct 84 are connected. The second plate-like member 4i is located in the space K1 between the pair of left and right air introduction openings 83a of the air cleaner 83. Further, the front side of the head pipe 3 and the second plate-like member 4i is located in a space K2 between the pair of left and right air discharge openings 84b of the intake duct 84. The traveling wind is introduced from the air introduction opening 84 a of the intake duct 84 and is introduced into the air cleaner 83 from the pair of left and right air discharge openings 84 b through the air introduction opening 83 a of the air cleaner 83, and the air is guided to the intake pipe 82. It is like that.

  The air cleaner 83 is disposed between the two frame portions 4 a of the main frame 4, is located on the front side of the fuel tank 13, and is covered with a tank cover 13 a. The cylinder of the engine 20 is provided with a fuel injection device 84 that injects fuel into the combustion chamber 85 of the cylinder.

  The suspension support structure of the engine 20 supports the engine side mounting portions 20a and 20b of the engine 20 to the engine body side mounting portions 4b and 4c of the main frame 4 and the engine side mounting portions 20c and 20d of the engine body of the rear arm bracket 5. The side mounting portions 5e and 5f are supported.

  An engine case 29 of the engine 20 houses a crankshaft 30, a countershaft 31, a transmission 32, and an output extraction shaft 33. A countershaft 31 is arranged in parallel with the crankshaft 30, and the power of the crankshaft 30 is taken out from the countershaft 31 and transmitted to the transmission main shaft 32a constituting the transmission 32, and transmitted from the transmission main shaft 32a to the output take-out shaft 33. . In the engine case 29, the transmission main shaft 32 a that constitutes the transmission 32 together with the output extraction shaft 33 is disposed above the output extraction shaft 33. The engine case 29 is provided with a shift pedal 45, and the shift operation lever 47 is rotated by the shift pedal 45 and the shift rod 46. The shift operation lever 47 activates the speed change mechanism 48 to switch the plurality of speed change gears of the transmission 32.

  As shown in FIGS. 1 and 7, the output take-out shaft 33 is provided with a drive sprocket 40, and a chain 42 is wound around the drive sprocket 40 and a driven sprocket 41 provided on the rear wheel 23. As a result, engine power is transmitted to the rear wheel 23 via the chain 42.

  The rear arm bracket 5 is formed with a rear arm pivot portion 5g at a position between the engine vehicle body side mounting portions 4b and 4c. A front end portion 21a of the rear arm 21 is pivotally supported on the rear arm pivot portion 5g via a pivot shaft 22, and a rear wheel 23 is supported on the rear end portion 21b of the rear arm 21. The rear arm 21 is supported via a link mechanism 24 and a rear cushion 25. The link mechanism 24 includes a vehicle body side link 24a and a rear arm side link 24b. One end portion 24a1 of the vehicle body side link 24a is rotatably connected to the link attachment portion 5h of the rear arm bracket 5, and one end portion 24b1 of the rear arm side link 24b is rotatably connected to the link attachment portion 21c of the rear arm 21, The center portion 24a2 of the vehicle body side link 24a and the other end portion 24b2 of the rear arm side link 24b are rotatably connected.

  The rear cushion 25 includes a cylinder portion 25a into which oil has been injected, a piston 25b movably inserted into the cylinder portion 25a, a piston rod 25c attached to the piston 25b, and a link provided at an end of the cylinder portion 25a. The mounting portion 25d includes a link mounting portion 25e provided at the end of the piston rod 25c, and a spring 25f interposed between the link mounting portion 25d and the link mounting portion 25e. A sub tank 25g is provided in the cylinder portion 25a into which the oil has been injected.

  In this embodiment, as shown in FIGS. 7 to 9, the rear cushion 25 has an upper end 25d1 of the link attachment portion 25d at the rear portion 29a of the engine case 29 and a protruding portion 29b1 of the upper portion 29b via a support pin 50. The lower end 25e1 of the link mounting portion 25e is supported on the end portion 24a3 of the vehicle body side link 24a via the support pin 51. The vehicle body side link 24a of the link mechanism 24 is disposed below the rear arm pivot support portion 5g of the rear arm 21, and the sliding direction A of the rear cushion 25 is disposed substantially perpendicular to the vertical direction B at a predetermined angle θ. ing. Due to the arrangement of the rear cushion 25, the weight of the rear cushion 25 is not applied as a force in the bending direction to the sliding portions such as the cylinder portion 25a and the piston 25b. For this reason, the sliding resistance between the cylinder portion 25a of the rear cushion 25 and the piston 25b is reduced, and the operability is good.

  Further, as shown in FIGS. 7 and 8, the rear portion 29a of the engine case 29 is formed with a protruding portion 29b1 protruding rearward at a position above the concave portion 29c facing the rear arm pivot portion 5g formed on the rear surface. ing. The both sides of the projecting portion 29b1 are applied to the engine vehicle body side mounting portion 5e formed on the rear arm bracket 5, and are fastened and supported by the fastening bolts 60, and the upper end 25d1 of the link mounting portion 25d is supported by the projecting portion 29b1. It is supported by support pins 50. Thus, by forming the mounting portion of the rear cushion 25 in the protruding portion 29b1, the mounting portion of the rear cushion can be disposed relatively rearward, and the sliding direction is substantially set with the longitudinal direction of the rear cushion 25 being vertical. It is easy to make it vertical.

  In this embodiment, the transmission main shaft 32a that constitutes the transmission 32 together with the output take-out shaft 33 in the engine case 29 is disposed above the output take-out shaft 33 to shorten the width of the engine 20 in the vehicle front-rear direction. In addition, a protruding portion 29b1 is formed in the transmission main shaft storage portion 29b2 that stores the transmission main shaft 32a. Since the projecting portion 29b1 is formed in the transmission main shaft storage portion 29b2 of the engine case 29, the engine case 29 can be used when the mounting portion of the rear cushion 25 is arranged upward, and the structure can be simplified.

  Further, the transmission mechanism 48 of the transmission 32 is arranged behind the transmission main shaft 32a, and the protrusion 29b1 is formed by the transmission mechanism housing portion 29b2, so that the engine case 29 can be used to form the protrusion 29b1. Can be simplified.

  Further, the transmission main shaft 32a is disposed above the output take-out shaft 33, and the rear cushion mounting portion is formed in the vicinity of the transmission main shaft storage portion 29b2 of the engine case 29, so that the vertical dimension of the rear portion 29a of the engine case 29 is increased. This increases the degree of freedom of arrangement when the longitudinal direction of the rear cushion 25 is vertical.

  In this embodiment, the rear arm bracket 5 constituting the vehicle body frame 2 has an extension portion 5d1 extending downward from the rear arm pivot support portion 5g at the lower portion 5d, and a link attachment portion 5h formed at the extension portion 5d1. Yes. When the vehicle body side link 24a is attached to the link attaching portion 5h, the frame structure is simple and the sliding direction is determined with the longitudinal direction of the rear cushion 25 being vertical when the link mechanism 24 is disposed below the rear arm pivot supporting portion 5g. It is easy to make it substantially vertical.

  Further, the extension portion 5d1 extends further downward from the engine mounting portion 5f positioned below the rear arm pivot portion 5g among the engine body side mounting portions 5e and 5f of the rear arm bracket 5 for mounting the engine 20 to the vehicle body frame 2. As a result, the engine 20 also acts as a rigid member, so that the link mechanism 24 can be supported more firmly.

  In this invention, the upper end of the rear cushion is supported at the rear and upper part of the engine case, the lower end of the rear cushion is supported by the link of the link mechanism, and the link of the link mechanism is disposed below the rear arm pivot portion of the rear arm. The sliding direction of the rear cushion is arranged substantially vertically, and the weight of the rear cushion is not applied as a force in the bending direction to the sliding portion, and the operability is good.

1 is a side view of a motorcycle. It is a side view of a body frame. It is a top view of a body frame. It is a perspective view of a body frame. It is an enlarged plan view of the front side part of a body frame. It is sectional drawing which follows the VI-VI line of FIG. It is an enlarged side view which shows attachment of an engine suspension and a rear cushion. It is a side view of the upper attachment part of a rear cushion. It is a plane of the upper attachment part of a rear cushion.

Explanation of symbols

2 Body frame 5g Rear arm pivotal support 20 Engine 21 Rear arm 23 Rear wheel 24 Link mechanism 25 Rear cushion 29 Engine case 29a Rear part of engine case 29

Claims (8)

An engine is mounted on the body frame, a link mechanism is provided between the body frame and the rear arm, a rear cushion is supported by the engine case and the link mechanism of the engine, and the rear wheel is moved up and down via the rear arm. A straddle vehicle that can be freely suspended,
The upper end of the rear cushion is supported at the rear and upper part of the engine case, and the lower end of the rear cushion is supported by the link of the link mechanism,
The link of the link mechanism is disposed at a position below the rear arm pivot portion of the rear arm,
A straddle vehicle characterized in that a sliding direction of the rear cushion is arranged substantially vertically. The rear portion of the engine case has a protrusion that protrudes rearward from the rear arm pivot at a position above the rear arm pivot.
The straddle vehicle according to claim 1, wherein a mounting portion of the rear cushion is formed on the protruding portion. The rear portion of the engine case has a protruding portion that protrudes rearward from the concave portion at a position above the concave portion facing the rear arm pivot portion formed on the rear surface thereof.
The straddle vehicle according to claim 1, wherein a mounting portion of the rear cushion is formed on the protruding portion. A transmission main shaft constituting a transmission together with an output take-out shaft in the engine case is disposed above the output take-out shaft,
The straddle vehicle according to claim 2 or 3, wherein the protruding portion is formed in a transmission main shaft storage portion of the engine case.   The straddle vehicle according to claim 4, wherein a transmission mechanism of the transmission is disposed behind the transmission main shaft, and a protruding portion is formed by the transmission mechanism housing portion. A transmission main shaft that constitutes a transmission together with the output take-out shaft in the engine case is disposed above the output take-out shaft,
The straddle vehicle according to claim 1, wherein the mounting portion of the rear cushion is formed in the vicinity of the transmission main shaft storage portion of the engine case. The vehicle body frame has an extension extending downward from the rear arm pivot portion,
The straddle vehicle according to claim 1, wherein the link is attached to the extension portion.   The extension portion is further extended downward from an engine vehicle body side mounting portion positioned below the rear arm pivot support portion of an engine vehicle body side mounting portion for mounting the engine to the vehicle body frame. The saddle riding vehicle according to Item 7.

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