JP4673742B2 - Mounting structure for motorcycle main stand - Google Patents

Description

  The present invention relates to a main stand attachment / detachment structure for a motorcycle.

As a conventional motorcycle main stand attachment / detachment structure, a main stand attached to a hanger link on the body frame side by a stand shaft is removed by releasing the stand shaft and then pulling the stand shaft in the axial direction. (For example, refer to Patent Document 1).
JP 62-43375 A

  1 and 2 of Patent Document 1, the bracket 3 is attached to the lower part of the rear portion of the vehicle body frame F, and the front end of the hanger link 4 is attached to the bracket 3 via a support bolt 6 so as to be swingable up and down. It is described that the bosses 9 and 9 of the power unit P are swingably attached to the intermediate portion of the link 4 via the hanger bolt 11 and the main stand 12 is swingably attached to the rear end of the hanger link 4 via the main stand shaft 13. Has been.

The bosses 9 and 9 are portions projecting downward from the front portion of the casing 8 of the power unit P, and the stand shaft 13 is located behind the bosses 9 and 9 and below the casing 8,
Even if the stand shaft 13 is pulled out in the axial direction for removing the main stand 12, it does not interfere with the bosses 9, 9 and the casing 8.

  In the above technique, since the bosses 9 are protruded downward from the casing 8, the ground height of the engine 1 constituting the power unit P is increased, and consequently the height of the seat 36 disposed above the engine 1 is high. Become. Further, the bottom of the trunk 37 disposed above the engine 1 is also increased, and the capacity of the trunk 37 is decreased.

The above problem can be solved by lowering the position of the power unit P. However, when the power unit P is lowered, the casing 8 approaches the stand shaft 13 and it becomes difficult to pull out or insert the stand shaft 13. This will impair maintenance such as mounting and removal.
As described above, it is difficult to achieve both the maintainability improvement of the main stand 12 and the reduction of the seat and the capacity of the storage unit.

  An object of the present invention is to improve the maintenance of the main stand, reduce the seat, and increase the capacity of the storage unit by improving the structure for attaching and detaching the main stand of the motorcycle.

The invention according to claim 1 is a motorcycle in which a front end of a link is attached to a body frame, an engine is swingably attached to the rear end of the link, and a main stand is swingably attached to the link. Are projected forward to form a pair of left and right front protrusions, and at the tip of these front protrusions, an engine connection shaft for connecting the engine to the link is provided, and the main stand is attached to the link behind the engine connection shaft. A stand connecting shaft is connected, and a through-hole used for attaching or removing the stand connecting shaft to the front projecting portion on the extension line of the stand connecting shaft is formed.

  As an action, when assembling the main stand, the stand connecting shaft is inserted from the through hole, and the main stand is connected to the link. When removing the main stand, the stand connecting shaft is pulled out from the through hole, and the connection between the link and the main stand is released. In this way, the main stand can be attached and detached without interfering with the stand connecting shaft.

  Also, by providing an engine connecting shaft that connects the link and the engine to the front projecting part that projects the left and right of the front part of the engine forward, the ground clearance of the engine is kept low, and the seat and storage part are located above the engine. When the is placed, the seat height does not increase and the capacity of the storage portion does not decrease.

The invention according to claim 2 is characterized in that through holes are provided in the left and right front projecting portions.
As an operation, for example, a stand connecting shaft is inserted from one through hole, and a tool for pushing the stand connecting shaft from the other through hole is inserted.

The invention according to claim 3 is characterized in that one of the through holes is a long hole.
As an effect, since the link swings with respect to the vehicle body frame, the positional relationship between the link connecting stand connecting shaft and the through hole provided in the forward projecting portion of the engine may change. If the through hole is a long hole, the through hole can be easily arranged on the extension of the stand connecting shaft.

In the invention according to claim 1, since the through hole used when assembling or removing the stand connecting shaft on the front projecting portion on the extension line of the stand connecting shaft is opened, the through hole provided in the front projecting portion, While the stand connecting shaft can be assembled and removed, the ground clearance of the engine can be lowered, the maintainability of the main stand can be improved, and the seat can be lowered and the storage capacity under the seat can be increased. be able to.

  In the invention according to claim 2, since the through holes are provided in the left and right front projecting portions, one through hole is used as a hole for inserting the stand connecting shaft, and the other through hole is inserted as a tool for pushing out the stand connecting shaft. By using the hole to be made, the stand connecting shaft can be easily inserted and removed, and the maintainability can be improved.

  In the invention according to claim 3, since one of the through holes is a long hole, even if the position of the stand connecting shaft is changed, the stand connecting shaft can be easily exposed to the long hole-shaped through hole. Since the shaft can be extruded with a tool, the maintainability can be further improved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a motorcycle employing a main stand attachment / detachment structure according to the present invention. The motorcycle 10 shows a pair of left and right rear frames 12 and 12 (only reference numeral 12 on the front side) constituting a body frame 11. The power unit 14 is attached to the lower part of the power unit 14 via a link 13 so as to be swingable up and down, and the rear cushion unit 16 is attached to the rear end of the power unit 14 and the rear end of one of the rear frames 12. The air cleaner 18 is attached to the upper part, and a pair of left and right floor frames 22 and 22 (only the reference numeral 22 on the front side is shown) is attached to the front part of the rear frame 12, and the driver puts his / her feet on these floor frames 22 and 22 This is a scooter type vehicle that supports the floor 23.

  The vehicle body frame 11 includes a head pipe 26 provided at a front end portion, a down pipe 27 extending substantially downward from the head pipe 26, and the rear frame 12 extending from the down pipe 27 to the left and right rear and rearward and obliquely upward. 12 and a pair of left and right link support brackets 28 and 28 (only the reference numeral 28 on the front side is shown) attached to the respective bent portions of the rear frames 12 and 12 in order to support the link 13 in a swingable manner. Become.

  The power unit 14 includes an engine 31 constituting a front portion and a continuously variable transmission 32 integrally connected to a rear portion of the engine 31, and a rear wheel 33 is attached to a rear end portion of the continuously variable transmission 32. It is.

  Here, 35 is an air cleaner, 37 and 38 are front and rear covers constituting the vehicle body cover 36, 41 is a front fork that is slidably attached to the head pipe 26, 42 is a front wheel, 43 is a front fender, and 44 is a bar. Handle, 46 is handle cover, 47 is front cover, 48 is leg shield, 51 is seat, 52 is storage box, 53 is tail lamp, 54 is rear fender, 56 is fuel tank, 57 is exhaust pipe, 58 is muffler, 61 is The main stand.

  FIG. 2 is a side view of the main part of the motorcycle according to the present invention (the arrow (FRONT in the figure indicates the front of the vehicle; the same applies hereinafter)), and the rear frames 12 and 12 (only the reference numeral 12 on the front side is shown). The link 13 is attached to the link support bracket 28 attached to the lower part of the link 13 via a bolt 71 and a rubber bush (not shown) so as to be swingable up and down, and a bolt 72 and rubber bushes 73 and 73 (front side) are attached to the rear end of the link 13. The power unit 14, specifically, a pair of left and right front protrusions 74, 76 (only the front side 74 is shown) is swingably attached via the link 13. The main stand 61 is swingably attached to the rear portion of the bolt 72 with a connecting pin 77, and the main stand 61 is jumped to one front projecting portion 74. The spring hanging member 81 to apply an end portion 78a of the tension coil spring 78 to increase indicating that the attached so as to protrude laterally.

The main stand 61 includes a plate-like member 83 provided on the connection pin 77 side, and a pipe assembly member 84 attached to the plate-like member 83. The imaginary line in the figure shows a state where the main stand 61 is flipped up. Reference numeral 85 denotes a crankshaft of the engine 31. A connecting pin 77 is disposed in front of the crankshaft 85.
The tension coil spring 78 has an end 78b hung on a hook member 86 provided on the pipe assembly 84 of the main stand 61.

The link 13 is an assembly that is bent downward and convex in a side view, and includes an outer pipe 87 at the front end, a protruding plate 88 attached to the outer pipe 87, and a rubber block 89 attached to the protruding plate 88. The swing of the link 13 is elastically restricted by inserting the protruding plate 88 and the rubber block 89 into a box-shaped support member 92 attached to the rear frame 12 with one end opened.

  The power unit 14 includes a crankcase 95 that houses the crankshaft 85, and is a drive source in which front projecting portions 74 and 76 that extend substantially horizontally forward are integrally formed at the front lower portion of the crankcase 95.

  The engine 31 includes a crankcase 95, a cylinder block 96 attached to the front portion of the crankcase 95, a cylinder head 97 attached to the front portion of the cylinder block 96, and a head cover 98 that covers the front end of the cylinder head 97. The cylinder shaft 101 of the cylinder provided in the cylinder block 96 is substantially horizontal (specifically, slightly lifted forward).

  The axis of the bolt 71 is 105 (indicated by a black circle), the axis of the bolt 72 is 106 (indicated by a black circle), the axis of the connecting pin 77 is 107 (indicated by a black circle), the axis of the pipe assembly member 84 of the main stand 61. That is, assuming that the stand longitudinal axis along the pipe body 108 constituting the pipe assembly member 84 is 109, the straight line 112 passing through the axis 105 and the axis 106 is substantially orthogonal to the stand longitudinal axis 109 in the state where the main stand 61 is erected. A straight line 113 passing through the axis 105 and the axis 107 is substantially parallel to the cylinder shaft 101, and the straight line 112 is also substantially parallel to the cylinder shaft 101.

  3 is a bottom view of the link and the main stand according to the present invention. The link 13 includes a frame-side end portion 121 arranged on the vehicle body frame 11 (see FIG. 1) side and extending in the vehicle width direction, and the frame-side end portion. A pair of left and right link bodies 122, 123 extending rearward from 121, and an engine side cylinder extending in the vehicle width direction disposed on the engine 31 (see FIG. 2) side by being attached to the rear ends of these link bodies 122, 123 Member 124, a pair of left and right sublinks 126, 127 attached to these link main bodies 122, 123 and engine side cylinder member 124, and left and right rear end cylinder members attached to the rear ends of these sublinks 126, 127, respectively. 128, 129. Reference numeral 131 denotes a nut screwed into the tip of the bolt 71, and 132 denotes a nut screwed into the tip of the bolt 72.

The plate-like member 83 of the main stand 61 is a member that is bent into a substantially Y-shaped box shape by bending the plate, and has a central projecting end 83a that is one end of the Y-shape, and the other two other ends of the Y-shape. The left projecting end 83b and the right projecting end 83c are integrally formed, and a cylindrical member 134 is attached to the tip of the center projecting end 83a.
The cylindrical member 134 is a member for inserting the connecting pin 77 together with the rear end cylindrical members 128 and 129 of the link 13.

  The pipe assembly member 84 of the main stand 61 includes a pair of left and right main pipes 136 and 137 attached to the left protruding end portion 83b and the right protruding end portion 83c of the plate-like member 83, and the ends of these main pipes 136 and 137, respectively. It consists of an attached cross pipe 138, an operating portion 141 attached to one main pipe 136 for operating with a foot, and the hook member 86 described above.

  The operation unit 141 includes a side pipe 142 that extends laterally, a pedal unit 143 that is attached to the tip of the side pipe 142, and a reinforcing plate 144 that is attached to the main pipe 136 and the side pipe 142 in order to reinforce the side pipe 142. Consists of.

  Since the spring hooking member 81 is provided on one forward projecting portion 74, a screw 81a is screwed into the screw and is detachably attached, and an annular groove 81b for hooking the tension coil spring 78 is formed at the tip.

  One forward projecting portion 74 is a portion in which a first through hole 146 through which a tool is passed in order to push out the connecting pin 77 when the connecting pin 77 is removed, and the other front projecting portion 76 sets the connecting pin 77 together. It is a portion where a second through hole 147 is formed to be attached or pulled out when the connecting pin 77 is removed.

  The tension coil spring 78 for the main stand 61 is provided on the left side of the engine 31 and the second through hole 147 is provided on the right side of the engine 31, so that the tension coil spring 78 becomes an obstacle when the connecting pin 77 is assembled or removed. In addition, maintainability can be improved. Further, as shown in FIG. 2, the first through hole 146 can be maintained without the side being blocked by the tension coil spring 78 when the main stand 61 is flipped up and standing.

  2 and 3, the front end of the link 13 is attached to the body frame 11, the engine 31 is attached to the rear end of the link 13 so as to be swingable, and the main stand 61 is attached to the link 13 so as to be swingable. In the motorcycle 10 (see FIG. 1), one end 78b of a tension coil spring 78 is attached to the main stand 61 as a spring for holding the spring-up state or the standing state. A spring hook member 81 for hooking the end portion 78a is protruded laterally from the engine 31, more specifically, the front protrusion 74.

Thus, the end portion 78a of the tension coil spring 78 can be easily hung on the spring hook member 81 or removed from the spring hook member 81 with almost no influence on the position of the link 13 , and the tension coil spring 78 can be assembled. Alternatively, maintenance such as removal can be improved, and the main stand 61 can be easily attached and detached.

  Further, since the spring hooking member 81 is detachably attached to the engine 31, the position of the spring hooking member 81 can be freely changed only by processing the engine 31 side, and the degree of freedom of the arrangement of the spring hooking member 81. Can be increased.

FIG. 4 is a perspective view showing a main stand mounting state according to the present invention, and is a view of the main stand 61 as viewed from obliquely below.
The engine-side cylinder member 124 of the link 13 is provided with a pair of left and right sub links 126 and 127 and a stopper member 151 for positioning the main stand 61 when the main stand 61 is standing up. It is a member to which a flat central protruding end 83a provided on the plate-like member 83 is applied.

  FIG. 5 is a perspective view showing the left side of the link and the engine according to the present invention, and a bolt for passing the first through hole 146 provided in the front protrusion 74 on the left side of the engine 31 through the engine side cylinder member 124 of the link 13. It shows that it was made into the circular-arc-shaped long hole in alignment with the circular arc centering on the axis of 72 (refer FIG. 3).

  As described above, the first through hole 146 is an arc-shaped long hole, so that when the main stand 61 is attached or detached, the tip of the connection pin 77 is positioned even if the stop position of the connection pin 77 changes due to the swing of the link 13. Since the first through hole 146 can be easily seen, the connecting pin 77 can be pushed out through the first through hole 146 with a tool.

  FIG. 6 is a perspective view showing the right side of the link and the engine according to the present invention. The second through hole 147 provided in the front protrusion 76 on the right side of the engine 31 is circular, and the main through the second through hole 147 is shown in FIG. The connection pin 77 is inserted or pulled out when the stand 61 is attached or detached.

  FIG. 7 is a main part side view showing the rear end portion of the link according to the present invention. The link main body 123 of the link 13 includes an upper link member 155 (the portion indicated by a thick line) and the upper link member 155. The lower link member 156 (the portion indicated by the bold line) attached to the lower part of the upper link member 155, and the engine side cylinder member 124 is attached to the rear ends of the upper link member 155 and the lower link member 156, and the link is made. A sub link 127 (shown by a thick line) is attached to the inner side surface of the main body 123 and the outer peripheral surface of the engine side cylinder member 124, and the rear end cylinder member 129 is attached to the rear end of the sub link 127. Indicates. The basic structure of the link body 122 and the sublink 126 is the same as that of the link body 123 and the sublink 127 described above.

A stopper member 151 (a cross-hatched part) is a U-shaped cross-section member, and a central protruding end provided on the plate-like member 83 of the main stand 61 in order to keep the main stand 61 upright. A flat surface 151a against which 83a is applied is provided, and end portions 151b and 151b are attached to the engine-side cylinder member 124 by welding.

Thus, by providing the stopper member 151 with the flat surface 151a and providing the plate-like member 83 of the main stand 61 with the central protruding end 83a, the flat surface 151a and the central protruding end 83a can be brought into contact with each other. The generated surface pressure can be reduced.

Accordingly, local hits occurring on the flat surface 151a and the central projecting end portion 83a can be prevented, and deformation of the stopper member 151 and the plate-like member 83 can be suppressed, so that the stopper member 151 and the plate-like member can be prevented. The rigidity of the member 83 can be reduced, and the weight of the stopper member 151 and the plate-like member 83 can be reduced. Thereby, the weight reduction of the motorcycle 10 (see FIG. 1) can also be achieved.

  Further, since the weight of the main stand 61 is reduced, the elastic force of the tension coil spring 78 attached to the main stand 61 is small, and the operability of the main stand 61 can be improved.

  Furthermore, by making the plate-like member 83 into a substantially U-shape, the main stand 61 can be arranged further forward of the vehicle, and the pipe assembly member 84 can be arranged almost directly below the bolt 72. Since the ground point of the stand 61 is located almost immediately below the bolt 72, the load acting on the connecting portion between the link 13 and the power unit 14 can be more effectively supported by the main stand 61.

  Further, as shown in FIGS. 3, 4, and 7, the stopper member 151 is an engine side cylinder member as a connecting member that connects the link main bodies 122 and 123 as a pair of left and right link arms constituting the link 13. Since it is attached to 124, it is not necessary to provide a special member for supporting the stopper member 151, an increase in the number of parts can be suppressed, the structure can be simplified, and the cost can be reduced.

  Further, since the main stand 61 is provided with a plate-like member 83 as a plate member that abuts against the stopper member 151, the plate-like member 83, specifically, the central projecting end 83 a abuts against the flat surface 151 a of the stopper member 151. The surface pressure of the portion can be further reduced, the rigidity can be further reduced as compared with the conventional stopper structure, and the main stand 61 can be further reduced in weight and improved in operability.

FIG. 8 is a cross-sectional view (partial bottom view) showing a main portion of the link connecting portion according to the present invention. The frame-side end 121 includes an inner pipe 161 and an outer pipe 87 covering the inner pipe 161. The outer pipe 87 includes a pair of left and right rubber bushings 162 and 162 fitted to the large-diameter hollow portions 87b and 87b having a diameter larger than that of the hollow portion 87a. The inner pipe 161 is a member that keeps the distance between the pair of rubber bushings 162 and 162 constant.

The rubber bush 162 includes an inner cylinder 165, an outer cylinder 166 disposed so as to surround the inner cylinder 165, and a rubber 167 bonded to each of the inner cylinder 165 and the outer cylinder 166 . And the bolt 71 is inserted into the inner pipe 161.

  The engine-side cylinder member 124 is a member disposed between the rubber bushes 171 and 171 fitted to the left and right front projecting portions 74 and 76, respectively, and elastically supported by these rubber bushes 171 and 171 via bolts 72. It is a thing.

  The rubber bush 171 includes an inner cylinder 173, an outer cylinder 174 disposed so as to surround the inner cylinder 173, and a rubber 175 bonded to each of the inner cylinder 173 and the outer cylinder 174. And the bolt 72 is inserted in the engine side cylinder member 124.

  The hollow portions 128a and 129a of the rear end cylindrical members 128 and 129 have the same inner diameter as the hollow portion 134a of the cylindrical member 134 of the main stand 61, and the connecting pin 77 is passed through the hollow portions 128a and 129a and the hollow portion 134a. A stopper is applied to the tip of the connecting pin 77. This retaining structure will be described later.

FIGS. 9A to 9C are explanatory views showing a connecting pin according to the present invention.
(A) is a side view of the connecting pin 77, the connecting pin 77 is formed with a projecting portion 181 extending in the radial direction at one end, and at the other end, that is, at the tip, an annular groove 182 having a bottom section in an arc shape; This is a member in which a pin insertion hole 183 opened in the bottom surface of the annular groove 182 and a groove portion 184 extending from the end surface by a predetermined length in the axial direction are formed.
The annular groove 182 is a portion on which a retaining pin described later is hung.

(B) is a view as viewed in the direction of arrow b in (a), and the protruding portion 181 is a portion forming a part of an annular ring, and the end surfaces 181a and 181a of the protruding portion 181 are connected to one rear end cylindrical member 129. When the connecting pin 77 is inserted, these are portions facing the end surfaces 129c and 129c of the arc portion 129b extended from the end portion of the rear end cylindrical member 129, and the end surfaces 181a and 181a and the end surfaces 129c and 129c face each other. Thus, the connection pin 77 can be prevented from rotating with respect to the rear end cylindrical members 128 and 129.
The pin insertion hole 183 is a hole for inserting a retaining pin, which will be described later, and is formed in a direction along the end surfaces 181a and 181a.

  (C) is a c arrow view of (a), the groove part 184 is a part which formed the bottom face 184a deeper than the annular groove 182, and makes the edge part 182b circular arc shape. Returning to (b), the groove 184 is a portion formed at a position of 90 ° in the circumferential direction with respect to the positions of the openings 183a and 183a of the pin insertion hole 183.

10 (a) and 10 (b) are explanatory views for explaining the retaining structure according to the present invention.
(A) shows the retaining plate 191 inserted in the front-end | tip of the connection pin 77 (refer Fig.9 (a)).
The retaining plate 191 includes an annular portion 191a, an inner projecting portion 191b integrally projecting inward from the annular portion 191a, and an outer projecting portion 191c integrally projecting outward from the annular portion 191a. . An imaginary line drawn on the outer protrusion 191c indicates a fold line 191d that indicates a position to be bent.

  (B) shows a state in which the retaining plate 191 is inserted at the front end of the connecting pin 77 so that the inner protruding portion 191b is positioned in the groove 184 after the connecting pin 77 is inserted into the rear end cylindrical members 128 and 129 (see FIG. 8). Insert the pin 194 into the pin insertion hole 183, specifically, the straight portion 194a constituting the retaining pin 194, and connect the curved portion 194b constituting the retaining pin 194 along the annular groove 182 to connect This shows that the outer protrusion 191c of the retaining plate 191 is bent along the folding line 191d (see (a)) after the retaining pin 194 is attached to the pin 77. Thus, by bending the outer protruding portion 191c, the bent portion 194e of the outer protruding portion 191c is adjacent to the loop portion 194c that connects the straight portion 194a and the curved portion 194b, and the retaining pin 194 is connected to the connecting pin 77. To prevent it from coming off.

  194e is a pin bent portion formed by bending from the bending portion 194b. When the retaining pin 194 is attached to the connecting pin 77, the bending portion 194b is easy to open with respect to the straight portion 194a, and the bending portion 194b is This is a portion that facilitates introduction into the annular groove 182.

The procedure for assembling and removing the main stand 61 described above will now be described.
11 (a) to 11 (c) are operation diagrams showing the procedure for assembling and removing the main stand according to the present invention.
In (a), the cylinder member 134 of the main stand 61 is disposed between the left and right rear end cylinder members 128 and 129 of the link 13. Then, the front end side of the connecting pin 77 is inserted through the second through hole 147 in the order of the rear end cylindrical member 129, the cylindrical member 134, and the rear end cylindrical member 128 as indicated by the arrow A.

  (B) shows that after the connecting pin 77 is inserted into the rear end cylindrical member 129, the cylindrical member 134, and the rear end cylindrical member 128, the retaining plate 191 and the retaining pin 194 are attached to the tip of the connecting pin 77, and the link 13 shows a state where the main stand 61 is assembled.

When removing the main stand 61 from the link 13, the retaining pin 194 and the retaining plate 191 are removed from the connecting pin 77 in (b), and the tool 197 is passed through the first penetration as shown by the arrow B in (c). It inserts in the hole 146, presses the connection pin 77 with the tool 197, and pushes out in order from the rear end cylinder member 128, the cylinder member 134, and the rear end cylinder member 129.
When the end portion of the connecting pin 77 comes out of the second through hole 147, the end portion (for example, the protruding portion 181) of the connecting pin 77 is grasped and pulled out. Thus, the main stand 61 can be removed from the link 13.

As shown in FIGS. 2, 3 and 11A to 11C, the front end of the link 13 is attached to the vehicle body frame 11, and the engine 31 is attached to the rear end of the link 13 so as to be swingable. In the motorcycle 10 (see FIG. 1) having a main stand 61 swingably attached to 13, the left and right front portions of the engine 31 protrude forward to form a pair of left and right front protrusions 74 and 76. A bolt 72 as an engine connecting shaft for connecting the engine 31 to the link 13 is provided at the tip of each of the projecting portions 74 and 76, and a stand connecting shaft for connecting the main stand 61 to the link 13 behind the bolt 72. mounting the connecting pins 77 of, to use when the forward-projecting portion 74, 76 on the extension line of the connecting pin 77, assembling the connecting pin 77, or to remove Opening the first through hole 146 and second through hole 147 as a through hole.

  Thus, the ground height of the engine 31 can be lowered while allowing the bolt 72 to be assembled and removed by the first through hole 146 and the second through hole 147 provided in the front projecting portions 74 and 76, and the main stand. 61 can be improved, the height of the sheet 51 (see FIG. 1) can be lowered, and the capacity of the storage box 52 (see FIG. 1) provided below the sheet 51 can be increased.

  In addition, since the first through hole 146 and the second through hole 147 are provided in the left and right front projecting portions 74 and 76, for example, one of the second through holes 147 is a hole into which the connecting pin 77 is inserted or pulled out. By using the other first through hole 146 as a hole for inserting the tool 197 for pushing out the connecting pin 77, the connecting pin 77 can be easily inserted and removed, and the maintainability can be improved.

  Further, as shown in FIGS. 5 and 11, since one of the first through holes 146 is a long hole, the connecting pin 77 is formed into a long first through hole 146 even if the position of the connecting pin 77 changes. Since the connecting pin 77 can be pushed out by the tool 197, the maintainability can be further improved.

FIGS. 12A and 12B are operation diagrams showing the operation of the main stand mounting structure.
(A) is a comparative example in which the front end of the link 202 is attached to the rear portion of the body frame 201 by a frame side connecting shaft 203 so as to be swingable up and down, and the lower portion of the engine 204 is attached to the rear end of the link 202 by the engine side connecting shaft 206. The main stand 207 is swingably attached to the lower portion of the engine 204 with a stand shaft 208, and is attached to the rear end of the continuously variable transmission 211 and the rear end of the vehicle body frame 201 that are integrally attached to the rear portion of the engine 204. It shows that the rear cushion unit 212 has been handed over and attached. The engine 204 and the continuously variable transmission 211 constitute a power unit 213. 204A is a cylinder shaft, and 214 is a crankshaft of the engine 204.

  Reference numeral 215 denotes a link swing restricting portion for restricting the swing of the link 202, a box-shaped support member 216 attached to the vehicle body frame 201, a protruding plate 217 attached to the front end of the link 202, and attached to and supported by the protruding plate 217. The rubber block 218 is housed in the member 216.

  When the main stand 207 is raised, the body frame 201 side sinks as indicated by an arrow D with respect to the power unit 213 with its weight. As a result, the link 202 swings downward about the engine side connecting shaft 206, so that the rubber block 218 of the link swing restricting portion 215 is compressed between the protruding plate 217 and the lower portion of the support member 216. Become.

  When the engine 204 is started in this state, the engine 204 may generate rotational vibration around the crankshaft 214 as indicated by the arrow E and vibration along the cylinder shaft 204A as indicated by the arrow F. The engine 204 generates vibration indicated by an arrow G about the stand shaft 208. If such vibration in the direction of arrow G occurs, the engine side connecting shaft 206 vibrates as indicated by arrow H. Since the rubber block 218 in the compressed state hardly absorbs vibration, the vibration of the engine side connecting shaft 206 is transmitted to the vehicle body frame 201 via the link 202, and the vehicle body frame 201 vibrates as indicated by an arrow J.

  (B) is an example (this embodiment), and when the main stand 61 is set up, the body frame 11 side sinks as shown by an arrow L with respect to the power unit 14 with its weight. As a result, the link 13 swings downward about the bolt 72, so that the rubber block 89 in the support member 92 is compressed between the protruding plate 88 and the lower portion of the support member 92.

  When the engine 31 is started in this state, the engine 31 may generate rotational vibration around the crankshaft 85 as indicated by the arrow M and vibration along the cylinder shaft 101 as indicated by the arrow N. The engine 31 generates vibration indicated by an arrow P centered on the bolt 72. Since the power unit 14 only vibrates around the bolt 72 in this way, this vibration is not transmitted to the link 13. Therefore, vibration is not transmitted from the engine 31 side to the vehicle body frame 11 even when the rubber block 89 is compressed.

In the present embodiment, as shown in FIG. 7, the cross-sectional shape of the stopper member 151 is a U shape. However, the shape is not limited to this, and any shape having a flat surface may be used.
Further, as shown in FIG. 3, the spring hook member 81 is detachably attached by screwing the screw 81a into the front projecting portion 74. However, the present invention is not limited to this, and a through hole is formed in the front projecting portion 74. The screw 81a may be passed through the through hole, and a nut may be screwed into the tip of the male screw 81a so as to be detachably attached. Alternatively, the spring-hanging member is an L-shaped member in side view, a through hole is made in the L-side surface, a general-purpose bolt is passed through the through-hole, and the bolt is screwed into the screw to be provided in the front projecting portion 74. It may be attached detachably.

  The main stand attachment / detachment structure of the present invention is suitable for a motorcycle.

1 is a side view of a motorcycle adopting a main stand attachment / detachment structure according to the present invention. 1 is a side view of a main part of a motorcycle according to the present invention. It is a bottom view of a link concerning the present invention, and a main stand. It is a perspective view which shows the main stand attachment state which concerns on this invention. It is a perspective view showing the link concerning the present invention, and the left side of an engine. It is a perspective view which shows the link which concerns on this invention, and the right side surface of an engine. It is a principal part side view which shows the rear-end part of the link which concerns on this invention. It is principal part sectional drawing which shows the connection part of the link which concerns on this invention. It is explanatory drawing which shows the connection pin which concerns on this invention. It is explanatory drawing explaining the retaining structure which concerns on this invention. It is an effect | action figure which shows the point of the assembly | attachment and removal of the main stand which concerns on this invention. It is an effect | action figure which shows the effect | action of the attachment structure of a main stand.

Explanation of symbols

10 ... Motorcycle, 11 ... body frame, 13 ... Link, 31 ... engine, 61 ... main stand, 7 2 ... engine connecting shaft (bolt) 74, 76 ... front projecting portion, 77 ... Stand connecting shaft (connecting pin) 146 ... through hole (first through hole), 147 ... through hole (second through hole).

Claims (3)

In a motorcycle in which the front end of the link is attached to the body frame, the engine is swingably attached to the rear end of the link, and the main stand is swingably attached to the link.
Left and right of the front part of the engine are protruded forward to form a pair of left and right front protrusions, and an engine connection shaft for connecting the engine to the link is provided at the front end of these front protrusions. A stand connecting shaft for connecting the main stand is attached to the link on the rear side of the link, and a through hole used when the stand connecting shaft is assembled to or removed from the front projecting portion on the extension line of the stand connecting shaft. Motorcycle main stand detachable structure, characterized by opening.   The motorcycle main stand attachment / detachment structure according to claim 1, wherein the through hole is provided in the left and right front projecting portions.   The main stand attachment / detachment structure for a motorcycle according to claim 2, wherein one of the through holes is a long hole.

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