JP2014125027A - Lift hook member installation structure and clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use an external stand table with a simple method without fixing a lift hook member to a swing arm in a lift hook member installation structure and a clamp device for engaging the external stand table independent from a vehicle body to the swing arm for supporting the vehicle body.SOLUTION: The clamp device 72 for being fixed detachably to the swing arm 15 by putting the swing art 15 in from a vertical direction, is provided. A lift hook bolt 71 is fixed to the clamp device 72. The clamp device 72 is formed into a concave shape so as to fit to a rear end shape of the swing arm 15 in a side surface view. The clamp device 72 has a pressing member 74 which is pressed by rotation of a screw shaft 75.

Description

  The present invention relates to a lift hook member mounting structure and a clamp device.

  Conventionally, a hook bolt (lift hook member) that protrudes outward in the vehicle width direction is fixed to a swing arm that supports the rear wheel of a motorcycle, and a front end hook of an external stand that is independent of the vehicle body is engaged with this protrusion. There is one that supports the vehicle body in an upright state by an upright operation of an external stand (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2005-138689

By the way, if a hook bolt is used in an off-road type motorcycle, the hook bolt may be buried in mud sand, or an obstacle such as a stone may collide with the hook bolt. There is a risk that.
On the other hand, for off-road type motorcycles, there is a method of supporting the vehicle body by setting an external stand under the engine in the center of the vehicle body. However, if there is a cover under the engine, remove the cover and install the external stand. Since it is necessary to set and the work becomes troublesome, it is preferable to support the vehicle body on the swing arm side.

  Accordingly, the present invention provides a lift hook member mounting structure and a clamp device for engaging a swing arm with an external stand independent of the vehicle body to support the vehicle body, and a simple method without fixing the lift hook member to the swing arm. The purpose is to make it possible to use an external stand.

As a means for solving the above-mentioned problems, the invention described in claim 1 is characterized in that in the lift hook member mounting structure for supporting the vehicle body by engaging the external stand (ST) with the swing arm (15), the swing arm (15 ) Is clamped from above and below to be detachably fixed to the swing arm (15), and a lift hook member (71) is fixed to the clamp means (72). And
According to a second aspect of the present invention, there is provided a contact surface (76a, 77a) of the clamp means (72) with the swing arm (15) in a lateral direction of the clamp means (72) with respect to the swing arm (15). In addition, a guide wall (81, 82) that defines an attachment position in at least one direction in the front-rear direction is erected.
According to a third aspect of the present invention, the clamping means (72) includes an upper arm portion (76) along the upper surface of the swing arm (15) and a lower arm portion (77) along the lower surface of the swing arm (15). And a connecting arm portion (78) for connecting the upper and lower arm portions (76, 77).
The invention described in claim 4 is characterized in that the concave shape of the clamping means (72) is formed so as to match the rear end shape of the swing arm (15) in a side view.
According to a fifth aspect of the present invention, in the clamp device (72) used in the lift hook member mounting structure, the upper arm portion (76), the lower arm portion (77), and the upper and lower arm portions (76, 77) are connected. A screw shaft having a clamp body (73) having a connecting arm portion (78) to be connected and screwed into a screw hole (75a) vertically penetrating at least one of the upper and lower arm portions (76, 77). (75), and is held by the clamp body (73) so as to engage with the end of the screw shaft (75) inside the clamp body (73) and pressed by the rotation of the screw shaft (75). A pressing member (74) and a lift hook member (71) fixed to the clamp body (73) are provided.

According to the first aspect of the present invention, the lift hook member can be easily installed by fixing the clamp means to the swing arm without fixing the lift hook member to the swing arm. For this reason, the vehicle body can be erected by the external stand by a simple operation while eliminating the possibility that the lift hook member becomes a running resistance or breaks when traveling on a rough road.
According to the second aspect of the present invention, the mounting position of the clamping means can be defined in directions other than the vertical direction, and the mounting work of the clamping means can be simplified.
According to the third aspect of the present invention, the mounting position in the pushing direction of the clamping means can be defined only by attaching the clamping means to the swing arm so as to push the swing arm into the concave shape of the clamping means. Installation work can be simplified.
According to the invention described in claim 4, it becomes easy to suppress the rattling of the clamping means, the clamping means can be attached to and detached from the rear end portion of the swing arm from the rear side, and the external stand is attached to and detached from the rear side of the swing arm. Since the work position is the same as that of the case, it is possible to easily attach and detach the external stand.
According to the fifth aspect of the present invention, for example, even if the lift hook member is not fixed to the swing arm of the motorcycle, the clamp device is attached to the swing arm from above and below, and the pressing member is rotated by rotating the screw shaft. The lift hook member can be easily installed by pressing and fixing to the swing arm side.

1 is a right side view of a motorcycle in an embodiment of the present invention. Fig. 2 is a right side view around the rear wheel of the motorcycle. It is III-III sectional drawing of FIG. Fig. 3 is a left side view around the rear wheel of the motorcycle. It is a side view of the clamp main body of the clamp apparatus attached to the swing arm of the said motorcycle. FIG. 6 is a view taken in the direction of arrow VI in FIG. 5.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle described below unless otherwise specified. Further, in the drawings used for the following explanation, an arrow FR indicating the front of the vehicle, an arrow LH indicating the left side of the vehicle, and an arrow UP indicating the upper side of the vehicle are shown.

  In the off-road type motorcycle 1 shown in FIG. 1, the front wheel 2 is pivotally supported at the lower ends of the left and right front forks 3. Upper portions of the left and right front forks 3 are pivotally supported by a head pipe 6 of a vehicle body frame 5 via a steering stem 4 so as to be steerable. A steering bar handle 7 is attached to the top bridge of the steering stem 4.

  The vehicle body frame 5 includes the head pipe 6, left and right main tubes 8 extending rearward and downward from the head pipe 6, left and right pivot frames 9 connecting the rear ends of the left and right main tubes 8, and the left and right main tubes 8 from the head pipe 6. A single down frame 11 that extends rearward and downward with a steeper slope, and left and right that branch from the lower end of the down frame 11 to the left and right and then bend and extend to the lower end of the left and right pivot frame 9 The lower frame 12 is integrally provided. A seat frame 13 is connected to the rear upper side of the vehicle body frame 5. An engine (internal combustion engine) 21 that is a prime mover of the motorcycle 1 is mounted inside the body frame 5.

  A front end portion of the swing arm 15 is pivotally supported on the left and right pivot frame 9 so as to swing up and down. A rear wheel 17 of the motorcycle 1 is pivotally supported at the rear ends of the left and right arms 16 of the swing arm 15. A lower end portion of the rear cushion unit 19 is connected to the lower side of the front portion of the swing arm 15 via a link mechanism 18. The upper end portion of the rear cushion unit 19 is connected to the cross member 14 that extends between the rear end portions of the left and right main tubes 8.

  The engine 21 is a water-cooled single-cylinder engine having a crankshaft parallel to the vehicle width direction (left-right direction), and a cylinder 23 is erected substantially vertically above a front part of a crankcase 22 that forms the lower part thereof. A cylinder head 24 is fixed on the cylinder 23. The rear part of the crankcase 22 also serves as a transmission case. An output shaft of the transmission protrudes from the rear left side of the crankcase 22. The output shaft and the rear wheel 17 are linked by a chain transmission mechanism 26 (see FIG. 4).

  An engine intake system is connected to the rear part of the cylinder head 24, and an engine exhaust system is connected to the front part of the cylinder head 24. In the figure, reference numeral 27 denotes an exhaust pipe that extends below the engine 21 in the engine exhaust system and extends to the right side of the rear part of the vehicle body, and reference numeral 28 denotes a silencer that is arranged on the right side of the rear part of the vehicle body and connects the exhaust pipe 27. A fuel tank 31 is disposed between the left and right main tubes 8. An occupant seating seat 32 supported on the seat frame 13 is disposed behind the fuel tank 31.

  A front cowl 33 that is supported by the vehicle body frame 5 and covers the front of the periphery of the head pipe 6 is disposed on the front upper side of the vehicle body. The front wall portion of the front cowl 33 is a transparent or translucent screen 34 that stands in front of the driver. Inside the screen 34, for example, a headlamp that illuminates the front of the vehicle through the screen 34 and various information display devices that display various information to the driver are arranged.

  In the figure, reference numeral 35 is a front fender supported by the bottom bridge of the steering stem 4, reference numeral 36 is a rear fender extending rearward of the seat 32, reference numeral 29 is a left and right radiator disposed on both sides of the down frame 11, and reference numeral 37 is a fuel tank. The left and right shrouds that cover the range from the side surface of 31 to the front side of the left and right radiator 29, reference numeral 31a is a second fuel tank disposed below the rear portion of the seat 32, and reference numeral 31b is a third fuel disposed on the side of the engine 21. Reference numeral 38 denotes a tank and an under cover that covers the engine 21 from the front to the bottom.

The front wheel 2 and the rear wheel 17 include wire spoke wheels 2a and 17a in which a hub and a rim are connected by a plurality of wire spokes.
As shown in FIG. 3, the hub 41 of the rear wheel 17 opens to the right at the cylindrical portion 44 extending left and right across the vehicle body and the left-right center line CL of the rear wheel 17 and the right end portion of the cylindrical portion 44. The plate-like portion 45 </ b> L having a circular shape when viewed from the side and the conical portion 45 </ b> R having a diameter enlarged so as to open to the left at the left side of the cylindrical portion 44 are integrally provided. The hub 41 is made of an aluminum alloy.

  The base end portions of the plurality of wire spokes are locked to the outer peripheral walls of the dish-like portion 45L and the conical portion 45R. The right wheel bearing 46R is press-fitted into the central inner periphery of the dish-like portion 45L. A cylindrical wall 45La is formed at the center of the conical portion 45R, and two left wheel bearings 46L aligned in the axial direction are press-fitted into the inner periphery of the cylindrical wall 45La. The left and right hole bearings rotatably support the hub 41 and thus the rear wheel 17 on the rear axle 47.

A cylindrical right seal wall 48R is erected on the right side of the center of the dish-like portion 45L. An annular bearing holder 49Ra is fitted on the inner periphery of the right seal wall 48R, and the inner periphery of the bearing holder 49Ra and the rear axle are fitted. A right seal member 49 </ b> R is inserted between the outer periphery of 47.
A cylindrical left seal wall 48L is connected to the left of the cylindrical wall 45La at the center of the conical portion 45R, and a left seal member 49L is fitted between the inner periphery of the left seal wall 48L and the outer periphery of the rear axle 47. The

  2 and 4 together, the brake disc 52 is fastened and fixed to the outer periphery of the right end portion of the dish-like portion 45L by a plurality of fastening bolts 53. A driven sprocket 26a of the chain transmission mechanism 26 is fastened and fixed to the outer periphery of the left end portion of the conical portion 45R by a plurality of fastening bolts 54.

  The swing arm 15 is formed by integrally joining a plurality of aluminum alloy parts by welding or the like. The left and right arms 16 have a square pipe-shaped arm body 56 and a solid end piece 57 joined to the rear end of the arm body 56. A concave portion 58 extending in the front-rear direction is formed on the outer side of the end piece 57, and a solid chain adjuster 59 made of aluminum alloy is held in the concave portion 58 so as to be movable in the front-rear direction. The chain adjuster 59 supports the end portion of the rear axle 47 that passes through the hub 41 of the rear wheel 17 along the vehicle width direction. Reference sign C <b> 1 in the drawing indicates the central axis of the rear axle 47.

  The rear axle 47 is composed of a long and hollow stepped bolt, and has a bolt head 61L at the left end thereof and a male screw portion 61R at the right end portion, and the bolt head portion 61L and the male screw portion 61R are interposed between them. Has a cylindrical shaft portion 62. The rear axle 47 penetrates the rear end portion of the left and right arms 16 and the hub 41 of the rear wheel 17 disposed therebetween from the left to the right, and protrudes to the right of the chain adjuster 59 of the right arm 16. The rear wheel 17 is pivotally supported between the left and right arms 16 by screwing and tightening the axle nut 63 to the portion 61R. A center collar 64 is disposed between the left and right wheel bearings 46L and 46R that pass through the rear axle 47, and a left and right side collar 65 is disposed outside the left and right wheel bearings 46L and 46R.

  Referring also to FIG. 1, a rear disc brake 67 including the brake disc 52 and a caliper 66 that clamps the brake disc 52 is formed between the rear portion of the right arm 16 of the swing arm 15 and the rear wheel 17. The caliper 66 is supported by the swing arm 15 via a caliper bracket 68 (see FIG. 2). A front disc brake 69 similar to the rear disc brake 67 is formed between the lower portion of the front fork 3 and the front wheel 2.

Here, the motorcycle 1 is a racing vehicle, and does not always have a stand for supporting the vehicle body in an upright state. When performing maintenance or inspection, an external stand ST independent from the vehicle body is used as shown in FIG. Is used to support the vehicle body in an upright state with the rear wheel 17 lifted.
The external stand ST is formed by combining a plurality of types of steel materials in a bowl shape, and has left and right lift hooks F that are slightly wider than the left and right arms 16 of the swing arm 15 and separated from each other (see FIG. 3). The external stand ST pushes down the operation arm M extending backward while the left and right lift hooks F are engaged with the left and right lift hook bolts 71 projecting outward from the left and right arms 16 of the swing arm 15 from the rear. The vehicle body is supported with the rear wheel 17 lifted from the ground G.

The lift hook bolt 71 is not fixed directly to the left and right arms 16 but is fixed to a left and right clamp device 72 that is detachably fixed to the left and right arms 16.
As shown in FIGS. 2 to 4, the clamp device 72 has a configuration corresponding to a so-called C-type clamp, and is attached to the rear end portion (end piece 57) of the arm 16 so as to be sandwiched from above and below.

  The clamp device 72 includes a clamp body 73 having a concave shape that matches the rear end shape of the arm 16 in a side view, and a pressing member that is held by an upper arm portion 76 that is in contact with the upper surface of the end piece 57 in the clamp body 73 so as to be vertically movable. 74 and a screw shaft 75 that is screwed into a screw hole 75a penetrating the upper arm portion 76 in the vertical direction so that the pressing member 74 can be pressed toward the end piece 57. In the figure, reference numeral 77 denotes a lower arm portion that contacts the lower surface of the end piece 57 in the clamp body 73, and reference numeral 78 denotes a connecting arm portion that connects the rear end portions of the upper and lower arm portions 76 and 77. Each component of the clamp device 72 is made of, for example, an aluminum alloy.

  The upper and lower arm portions 76 and 77 have the same lateral width as the end piece 57, and the lower surface 76 a of the upper arm portion 76 is on the upper surface of the end piece 57, and the upper surface 77 a of the lower arm portion 77 is on the lower surface of the end piece 57, respectively. Opposite parallel. The upper and lower surfaces of the arm 16 including the end piece 57 are tapered slightly so that they approach each other toward the rear side in a side view.

  Referring to FIGS. 5 and 6 together, a lower part of the upper arm portion 76 is formed with a gate-shaped recess 79 that opens downward (endpiece 57 side) in a side view. A pressing member 74 having a vertical width slightly narrower than the vertical width is disposed in the recess 79. The pressing member 74 can be moved up and down in the recess 79 by bringing the front and rear surfaces thereof into sliding contact with the front and rear surfaces in the recess 79. The pressing member 74 is held in the recess 79 so as not to fall off by inserting a cord-like member around which the upper arm portion 76 is wound into, for example, front and rear locking holes 74a formed at the front and rear of the upper portion thereof. Note that the holding means of the pressing member 74 is not limited to the cord-like member. Guide means for guiding the vertical movement of the pressing member 74 may be provided in at least one of the recess 79 and the pressing member 74.

  A screw hole 71b extending in the vehicle width direction is formed on the lower side of the front portion of the lower arm portion 77, and a screw shaft 71a on the proximal end side of the lift hook bolt 71 protruding outward from the lower arm portion 77 is formed in the screw hole 71b. Screwed. Since the lower arm portion 77 has a lateral width equivalent to that of the end piece 57, the screwing length of the screw shaft 71a of the lift hook bolt 71 is secured, and the rigidity of the lift hook bolt 71 is secured. The connecting arm portion 78 displaces the outer side surface 78b inward from the outer side surfaces 76b and 77b of the upper and lower arm portions 76 and 77, thereby reducing the left and right width H2 from the left and right width H1 of the upper and lower arm portions 76 and 77. . The left-right width H2 is set to be equal to or thinner than the left-right width H3 (see FIG. 3) of the portion where the recess 58 of the end piece 57 is formed. As a result, even when the chain adjuster 59 is pulled backward with the clamp device 72 mounted, the chain adjuster 59 does not interfere with the clamp device, and the workability in the jack-up state is improved. Moreover, it contributes to the weight reduction of the clamp apparatus 72 and identification of right and left.

  The lift hook bolt 71 is located in front of the rear end of the swing arm 15 in a state where the clamp device 72 is mounted on the swing arm 15. Thereby, when the rear wheel 17 is lifted by the external stand ST, the lift hook bolt 71 supports the fulcrum (rear end portion) of the swing arm 15 from vertically below. For this reason, compared with the case where the lift hook bolt 71 is located behind the rear end of the swing arm 15, the generation of the moment at the center of the lift hook bolt 71 due to the load from the swing arm 15 is suppressed, and the clamp body 73. It becomes possible to suppress the rigidity.

  An upper guide wall 81 is formed at a portion of the lower surface 76a of the upper arm portion 76 (a contact surface with the end piece 57) in front of the concave portion 79 so as to stand downward from the inner edge and contact the inner side surface of the end piece 57. The A lower guide wall 82 is formed on the front half of the upper surface 77a (contact surface with the end piece 57) of the lower arm portion 77 so as to stand upward from the inner edge thereof and contact the inner side surface of the end piece 57. The vertical guide walls 81 and 82 are in contact with the inner surface of the end piece 57, whereby the position of the clamp device 72 in the left-right direction with respect to the swing arm 15 is defined. The position of the clamp device 72 in the front-rear direction with respect to the swing arm 15 is defined by the rear end of the end piece 57 coming into contact with the front surface 78 a of the connecting arm portion 78. In this state, the lower surface 76a of the upper arm portion 76 and the upper surface 77a of the lower arm portion 77 face the upper and lower surfaces of the end piece 57, respectively, and the vertical position of the clamp device 72 with respect to the swing arm 15 is defined.

  With the clamp device 72 positioned with respect to the swing arm 15, the operating lever 75 b fixed to the upper end of the screw shaft 75 is operated to tighten the screw shaft 75, so that the pressing member 74 is placed on the upper surface of the end piece 57. Pressed. Accordingly, the clamp device 72 that receives the weight of the rear portion of the vehicle body is firmly fixed to the swing arm 15 with the end piece 57 sandwiched from above and below. When the operation lever 75b is fixed to the screw shaft 75, the screw pitch of the screw shaft 75 is increased so that the operation of the operation lever 75b is not hindered by the brake disc 52 or the driven sprocket 26a, and the swing arm 15 is rotated by about a half turn. It is good to complete pinching. Alternatively, the operation lever 75b may be movable with respect to the screw shaft 75, such as swinging or sliding.

As described above, the lift hook member mounting structure in the above embodiment includes the clamp device 72 that is detachably fixed to the swing arm 15 by sandwiching the swing arm 15 from above and below, and the lift hook bolt is attached to the clamp device 72. 71 is fixed.
According to this configuration, the lift hook member can be easily installed by fixing the clamp device 72 to the swing arm 15 without fixing the lift hook member to the swing arm 15. For this reason, the vehicle body can be erected by the external stand ST with a simple operation while eliminating the possibility of the lift hook member becoming a running resistance or being damaged when traveling on rough roads.

  In the lift hook member mounting structure, guide walls 81 and 82 defining the mounting position of the clamping device 72 in the left-right direction with respect to the swing arm 15 are provided on the contact surfaces (upper and lower surfaces 76a and 77a) of the clamping device 72 with the swing arm 15. By being erected, the mounting position of the clamping device 72 can be defined in directions other than the vertical direction, and the mounting work of the clamping means can be simplified.

  In the lift hook member mounting structure, the clamp device 72 is a connecting arm that connects the upper arm portion 76 along the upper surface of the swing arm 15, the lower arm portion 77 along the lower surface of the swing arm 15, and the upper and lower arm portions 76, 77. Therefore, the clamping device 72 is attached to the swing arm 15 so as to push the swing arm 15 into the concave shape of the clamping device 72. The mounting position in the direction) can be defined, and the mounting work of the clamping device 72 can be simplified.

  The lift hook member mounting structure is such that the concave shape of the clamp device 72 is formed so as to match the rear end shape of the swing arm 15 in a side view, thereby making it easier to suppress rattling of the clamp device 72 and the swing arm. The clamp device 72 can be attached to and detached from the rear end of the rear end 15, and the work position is the same as when the external stand ST is attached to and detached from the swing arm 15 from the rear, making it easy to attach and detach the external stand ST. it can.

  The clamp device 72 in the embodiment includes a clamp body 73 having an upper arm portion 76, a lower arm portion 77, and a connecting arm portion 78 that connects the upper and lower arm portions 76, 77, and moves the upper arm portion 76 up and down. A screw shaft 75 that is screwed into a screw hole 75a that penetrates the screw shaft 75, and is held by the clamp main body 73 so as to engage with an end of the screw shaft 75 inside the clamp main body 73 (on the swing arm 15 side). By providing a pressing member 74 that is pressed by rotation and a lift hook bolt 71 that is fixed to the clamp body 73, the clamp does not have to be fixed to the swing arm 15 of the motorcycle 1. The device 72 is attached to the swing arm 15 from above and below, and the pressing member 74 is pressed and fixed to the swing arm 15 side by the rotation of the screw shaft 75. In, it can be installed lifting hook member easily to the swing arm 15.

The present invention is not limited to the above-described embodiment, and for example, a configuration in which the clamp device 72 is attached to and detached from the arm 16 from the side may be employed. The screw shaft 75 and the pressing member 74 may be provided on at least one of the upper and lower arm portions 76 and 77. The clamp device 72 may have a guide wall that is in contact with an outer surface, a rear end surface, or the like other than the inner surface of the swing arm 15. The lift hook F may be fixed to the clamp device 72 and the lift hook bolt 71 may be fixed to the external stand ST.
And the structure in the said embodiment is an example of this invention, A various change is possible in the range which does not deviate from the summary of the said invention.

15 Swing arm 71 Lift hook bolt (lift hook member)
72 Clamping Device 73 Clamp Body 74 Pressing Member 75 Screw Shaft 75a Screw Hole 76 Upper Arm 76a Bottom Surface (Contact Surface)
77 Lower arm 77a Upper surface (contact surface)
78 Connecting arm 81 Upper guide wall (guide wall)
82 Lower guide wall (guide wall)
ST External stand

Claims (5)

In the lift hook member mounting structure for supporting the vehicle body by engaging the external stand (ST) with the swing arm (15),
Clamp means (72) that is detachably fixed to the swing arm (15) by sandwiching the swing arm (15) from above and below,
A lift hook member mounting structure, wherein a lift hook member (71) is fixed to the clamp means (72).   The clamp means (72) is attached to the contact surface (76a, 77a) of the clamp means (72) with the swing arm (15) in at least one direction of the clamp means (72) with respect to the swing arm (15). The lift hook member mounting structure according to claim 1, wherein guide walls (81, 82) defining a position are provided upright.   The clamp means (72) includes an upper arm portion (76) along the upper surface of the swing arm (15), a lower arm portion (77) along the lower surface of the swing arm (15), and the upper and lower arm portions (76, 77) The lift hook member mounting structure according to claim 1 or 2, wherein the lift hook member mounting structure is formed in a concave shape having a connecting arm portion (78) for connecting the two.   The lift hook member mounting structure according to claim 3, wherein the concave shape of the clamp means (72) is formed to match the rear end shape of the swing arm (15) in a side view.   A clamp body (73) having an upper arm part (76), a lower arm part (77), and a connecting arm part (78) for connecting the upper and lower arm parts (76, 77), and the upper and lower arms A screw shaft (75) screwed into a screw hole (75a) vertically passing through at least one of the portions (76, 77), and an end of the screw shaft (75) inside the clamp body (73). A pressing member (74) that is held by the clamp body (73) and pressed by the rotation of the screw shaft (75) so as to match, and a lift hook member (71) fixed to the clamp body (73) And a clamping device.

Images