JP2012201340A - Chain adjustment structure of saddle-riding type vehicle - Google Patents

Abstract

An object of the present invention is to prevent the rotation of an axle collar when fastening an axle and reduce the processing cost of an end piece.
A power unit supported by a vehicle body frame, a drive sprocket provided on an output shaft of the power unit, a driven sprocket driven by the drive sprocket via a chain and attached to a rear wheel, and a rear part And a swing arm 23 whose front part is pivotally supported by the vehicle body frame. An end member 39 is fixed to the rear end of the swing arm, and a swing is mounted on the end member. A chain adjuster for a saddle-ride type vehicle, provided with a long hole 81 along the longitudinal direction of the arm 23, fastened in contact with the side surface 83 of the end member, and provided with an axle collar 85 through which the axle 41 of the rear wheel is inserted. In the structure, on the inner side surface in the vehicle width direction of the axle collar, the long hole 81 of the end member is inserted and locked. Protrusion 113 is configured to be provided to.
[Selection] Figure 3

Description

  The present invention relates to a chain adjuster structure for a saddle-ride type vehicle.

  Generally, a saddle-ride type vehicle such as a motorcycle includes a body frame and an engine supported by the body frame. The engine is provided with an output shaft, and a drive sprocket is connected to the output shaft. A swing arm is pivotally supported on the vehicle body frame, and a rear wheel axle is fixed to a rear portion of the swing arm. A rear wheel is rotatably supported on the rear wheel axle, and a driven sprocket is integrally attached to the rear wheel. A chain is wound around the driving sprocket and the driven sprocket so that the driving force of the engine is transmitted to the rear wheels.

As a chain adjuster structure for this type of saddle-ride type vehicle, an end piece having a long hole is formed at the rear end of the swing arm, the rear wheel axle is formed as a bolt, and the rear wheel axle is used as a long hole in the end piece. It is generally known that it is fixed to the end piece by passing through and tightening an axle nut at the tip, and the chain tension can be adjusted by moving the fixed position of the rear axle. In this type of chain adjuster structure, a washer (axle collar) is interposed between the bolt head of the rear wheel axle and the end piece and between the axle nut and the end piece to firmly fix the rear wheel axle. It is common to insert them, but in this case, there is a problem that the axle collar rotates when the axle is fastened.
Therefore, conventionally, a substantially U-shaped recess opened to the outside of the vehicle width is formed on the end piece, and the axle collar is rotated when the axle is fastened by fitting a substantially rectangular axle collar into the recess of the end piece. A technique for preventing the above has been proposed (see Patent Document 1, for example).

JP 2010-167866 A

However, in the above-described conventional technique, the end piece is formed with a substantially U-shaped recess that is open to the outside of the vehicle width, so that there are many machined parts of the end piece and the manufacturing cost of the end piece increases. There is.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a chain adjuster structure capable of achieving both prevention of rotation of the axle collar when the axle is fastened and reduction in processing cost of the end piece.

To achieve the above object, the present invention provides a vehicle body frame (3), a power unit (5) supported by the vehicle body frame (3), and a drive sprocket provided on an output shaft of the power unit (5). (59), a driven sprocket (43) that is driven by the drive sprocket (59) via the chain (61) and attached to the rear wheel (9), and the rear wheel (9) is pivotally supported at the rear part. In addition, a swing arm (23) whose front part is pivotally supported by the vehicle body frame (3) is provided, and an end member (39) is fixed to the rear end of the swing arm (23). (39) is provided with a long hole (81) along the longitudinal direction of the swing arm (23), which is fastened in contact with the side surface (83) of the end member (39), and the axle of the rear wheel (9) ( 41) is inserted In the chain adjuster structure of the saddle-ride type vehicle provided with the axle collar (85), the elongated hole (81) of the end member (39) is formed on the inner side surface (95) in the vehicle width direction of the axle collar (85). A protrusion (113) that is inserted and locked is provided.
In the present invention, since the protrusion portion that is inserted and locked into the long hole of the end member is provided on the inner side surface in the vehicle width direction of the axle collar, the end member is prevented from rotating the axle collar as in the related art. Even if the shape is not processed, the rotation of the axle collar is restricted by the engagement between the projection and the long hole. Thereby, it is possible to achieve both prevention of rotation of the axle collar at the time of fastening the axle and reduction of the processing cost of the end piece.

The upper edge (105) and the lower edge (109) of the axle collar (85) may be provided so as to be substantially along the upper edge (107) and the lower edge (111) of the end member (39).
Since the upper and lower edges of the axle collar are substantially along the upper and lower edges of the end member, the contact surface between the axle collar and the end member can be increased, and the axle collar and the end member can be secured by fastening the rear axle. The rear wheel axle can be firmly fixed by reducing the surface pressure generated on the contact surface with the rear wheel axle.
The end member (39) may be formed of an extruded material whose rear portion is L-shaped when viewed in the vertical direction, and the elongated hole (81) may be provided by machining.
Since the end member is formed of an L-shaped extruded material when viewed from the top and bottom, it is not necessary to form a contact surface with the axle collar of the end member by machining, and the number of machining parts of the end piece is reduced. Machining costs can be reduced.

Scale lines (133, 135) may be provided above and below the long hole (81) of the end member (39), and the scale lines (133, 135) may be integrally formed by extrusion molding.
Since the scale line of the end member is formed by extrusion molding, the machining cost of the end piece can be reduced and the machining cost can be reduced.
The protrusion (113) of the axle collar (85) may be composed of an upper wall (123) and a lower wall (125) having a valley (127) in the middle.
Since the projection portion of the axle collar is composed of an upper wall portion and a lower wall portion having a valley portion in the middle, the thickness of an unnecessary portion can be reduced and the weight of the axle collar can be reduced.

According to the present invention, since the protruding portion that is inserted into the long hole of the end member and locked is provided on the inner side surface in the vehicle width direction of the axle collar, the end member is prevented from rotating as in the conventional case. Even without processing the shape for this purpose, the rotation of the axle collar is restricted by the engagement between the projection and the long hole. Thereby, it is possible to achieve both prevention of rotation of the axle collar at the time of fastening the axle and reduction of the processing cost of the end piece.
If the upper and lower edges of the axle collar are provided so as to be substantially along the upper and lower edges of the end member, the contact surface between the axle collar and the end member can be increased, and the rear axle is fastened. Thus, the surface pressure generated on the contact surface between the axle collar and the end member can be reduced, and the rear wheel axle can be firmly fixed.

If the end member is formed of an L-shaped extruded material when viewed from the top and bottom, and a long hole is provided by machining, the contact surface of the end member with the axle collar is formed by machining. There is no need, and the machining cost of the end piece can be reduced and the machining cost can be reduced.
Scale lines are provided above and below the long holes of the end member, and if the scale lines are integrally formed by extrusion molding, the scale lines of the end member are formed by extrusion molding. This can reduce the processing cost.
If the projection part of the axle collar is composed of an upper wall part and a lower wall part having a valley part in the middle, the thickness of an unnecessary part can be reduced, and the weight of the axle collar can be reduced.

1 is a left side view of a motorcycle according to an embodiment of the present invention. It is a left view of a swing arm. FIG. 3 is an enlarged perspective view near the rear axle. It is a left view of a swing arm rear end. It is a top view of a swing arm rear end. It is the VI-VI sectional view taken on the line in FIG. It is the VII-VII sectional view taken on the line in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, a chain adjuster device applied to a motorcycle will be described as one aspect of the chain adjuster structure of the saddle-ride type vehicle according to the present invention.
In the present specification, front / rear / left / right / up / down are front / rear / left / right / up / down of the vehicle body as viewed from a motorcycle driver.

FIG. 1 is a left side view of a motorcycle 1 to which a chain adjuster structure according to the present invention is applied. The motorcycle 1 includes a body frame 3, an engine 5 that is a power unit supported by the front and rear intermediate portions of the body frame 3, front wheels 7 that are steerably supported by the front portion of the body frame 3, and the body frame 3. And a rear wheel 9 supported by the rear portion and driven by the driving force of the engine 5.
A steering pipe 11 is pivotally supported at the front end of the vehicle body frame 3. A pair of left and right front forks 15 are connected to the steering pipe 11 via a bridge member 13. A front wheel axle 17 is provided at the lower end of the front fork 15, and the front wheel 7 is pivotally supported by the front wheel axle 17. A steering handle 19 is fixed to the upper portion of the bridge member 13.

A swing arm 23 is pivotally supported at the lower rear of the body frame 3 so as to be swingable. Specifically, a pivot shaft 21 extending in the vehicle width direction is provided at the lower rear of the vehicle body frame 3, and the pivot shaft 21 penetrates the pivot shaft hole 25 at the front end of the swing arm 23, and the front portion of the swing arm 23. Is pivotally supported. The swing arm 23 is substantially H-shaped when viewed from above, and includes a left and right arm portion 27 formed of a square pipe, and a left and right connecting portion 29 (see FIG. 3) that connects the front and rear intermediate portions of the left and right arm portions 27. I have.
The rear wheel 9 is rotatably supported on the rear portion 37 of the swing arm 23. Specifically, a pair of left and right end pieces 39 are respectively provided at the rear end portions 73 of the left and right arm portions 27 of the swing arm 23, and a rear axle 41 is fixed between the left and right end pieces 39. A rear wheel 9 is rotatably supported. A driven sprocket 43 is rotatably attached to the rear wheel 9.

A bracket 31 extending downward is provided on the left and right connecting portion 29 of the swing arm 23, and a lower end portion of the rear shock absorber 35 is connected to the bracket 31 via a link 33. An upper end portion of the rear shock absorber 35 is connected to an upper rear portion of the vehicle body frame 3.
An engine 5 is mounted on the front and rear intermediate portion of the lower portion of the vehicle body frame 3. The engine 5 includes a cylinder 45 and a crankcase 47 connected to the lower side of the cylinder 45.
An exhaust pipe 49 is connected to the front side of the cylinder 45. The exhaust pipe 49 extends forward and bends downward, further bends backward, extends to the rear of the vehicle body through the right side of the cylinder 45, and is connected to the muffler 51 at the upper right front of the rear wheel 9. An engine intake system 57 having a throttle body 53 and an air cleaner 55 is connected to the rear side of the cylinder 45.

An output shaft (not shown) projects from the left side of the rear portion of the crankcase 47, and a drive sprocket 59 is provided integrally with the output shaft (not shown). A chain 61 is wound around the drive sprocket 59 and the driven sprocket 43 described above, and the driven sprocket 43 is driven by the drive sprocket 59 via the chain 61.
A radiator 63 is provided at the front of the body frame 3 in front of the engine 5, and a fuel tank 65 is provided above the body frame 3 above the engine 5. A seat 67 is installed behind the fuel tank 65. A front fender 69 and a rear fender 71 are provided above the front wheel 7 and the rear wheel 9, respectively.

Next, the fixing structure of the rear axle 41 will be described.
FIG. 2 is a side view of the swing arm 23, and FIG. 3 is a partially omitted perspective view of the vicinity of the rear portion 37 of the swing arm 23.
A pair of left and right end pieces 39 are provided at the rear end portions 73 of the left and right arm portions 27 of the swing arm 23, respectively. As shown in FIG. 3, a rear axle 41 is fixed between the left and right end pieces 39, and a rear wheel 9 (not shown in FIG. 3) is rotatably supported on the rear axle 41.

  4 is a left side view in the vicinity of the left end piece, and FIG. 5 is a top view in the vicinity of the left end piece. As shown in FIG. 4, the end piece 39 has a substantially rectangular shape in a side view, and as shown in FIG. 5, the end piece 39 is entirely formed of a substantially L-shaped extrusion material in a top view (see FIG. 5). And a wide attachment portion 75 and an axle support portion 77 that is narrow and extends rearward from the attachment portion 75.

As shown in FIG. 3, the attachment portion 75 of the end piece 39 is fitted into the opening 79 at the rear end of the arm portion 27, and the outer periphery of the attachment portion 75 and the edge of the opening 79 at the rear end of the arm portion 27 are welded. Thus, the left and right arm portions 27 are fixed to the rear end portions 73.
Here, the attachment portion 75 of the end piece 39 is formed in substantially the same shape as the opening 79 at the rear end of the arm portion 27.
The axle support portions 77 of the left and right end pieces 39 are respectively formed with long holes 81 through which the rear axle 41 can be inserted along the longitudinal direction of the swing arm 23. A pair of left and right axle collars 85 are attached to the outer side of the left and right end pieces 39, and shaft holes 87 (see FIG. 4) through which the rear axle 41 can be inserted are formed in the left and right axle collars 85, respectively. ing.

The rear axle 41 is a long bolt, and has a screw head 89 at the right end in the figure. The rear axle 41 is inserted from the left side of the vehicle body (the right side in the figure) and passes through the shaft hole 87 of the axle collar 85, the long hole 81 of the end piece 39, and the axle hole (not shown) of the rear wheel 9 (see FIG. 1). Further, it protrudes through the long hole 81 of the end piece 39 on the right side (left side in the figure) and the shaft hole 87 of the axle collar 85, and an axle nut 91 is fastened to the tip thereof. In this configuration, the rear axle 41 is firmly fixed to the left and right end pieces 39 via the left and right axle collars 85 by tightening the axle nut 91.
As shown in FIG. 6, the axle collar 85 has a substantially trapezoidal columnar shape, and includes an outer surface 93, an inner surface 95, an upper surface 97, a lower surface 99, a front surface 101 (see FIG. 4), and a rear surface 103 (see FIG. 4). And have.

The axle collar 85 is a member that increases the contact area with the end piece 39 when fastened by the rear axle 41, and at the time of fastening, the inner surface 95 of the axle collar 85 has a vehicle width of the end piece 39 as shown in FIG. Contact the outer surface 83. Further, as shown in FIG. 4, the upper edge 105 of the inner surface 95 of the axle collar 85 is substantially along the upper edge 107 of the vehicle outer side surface 83 of the end piece 39, and the lower edge 109 of the inner surface 95 of the axle collar 85. Is substantially along the lower edge 111 of the vehicle width outer surface 83 of the end piece 39.
Thereby, it forms so that the contact area of the axle collar 85 and the end piece 39 may be ensured large.

As shown in FIG. 5, the front portion of the inner surface 95 of the axle collar 85 is formed with a protrusion 113 that protrudes inward of the vehicle width. The protrusion 113 is formed in the end piece 39 as shown in FIGS. 6 and 7. The long hole 81 is inserted. Further, as shown in FIG. 7, the upper surface 115 and the lower surface 117 of the protrusion 113 are respectively along the inner peripheral surface upper portion 119 and the inner peripheral surface lower portion 121 of the elongated hole 81 of the end piece 39 and rotate the axle collar 85. When the force to be applied is applied, the upper surface 115 and the lower surface 117 of the protrusion 113 abut against the inner peripheral surface upper part 119 and the inner peripheral surface lower part 121 of the elongated hole 81 of the end piece 39, respectively, and the rotation of the axle collar 85 is prevented. It has become so.
As shown in FIG. 6, the protruding portion 113 is formed on the outer side of the vehicle width at an intermediate portion between the upper wall portion 123 including the upper surface 115, the lower wall portion 125 including the lower surface 117, and the upper wall portion 123 and the lower wall portion 125. The axle collar 85 is reduced in weight by reducing the thickness of the valley portion 127.

As shown in FIG. 5, the head 139 of the adjustment bolt 137 is in contact with the front surface 101 of the axle collar 85. The adjustment bolt 137 regulates the position of the axle collar 85, and is screwed into a screw hole 141 formed in the attachment portion 75 of the end piece 39, and a lock nut 143 is hung thereon.
The screw hole 141 penetrates in the longitudinal direction of the swing arm 23, and when the adjustment bolt 137 is rotated left and right, the head 139 moves in the longitudinal direction of the swing arm 23, and the lock nut 143 is attached to the attachment portion of the end piece 39. By tightening to 75, the rotation of the adjusting bolt 137 is locked.

As shown in FIG. 4, a groove 129 and a groove 131 extending in the vehicle width direction are formed on the upper surface 97 and the lower surface 99 of the axle collar 85, respectively, and these grooves 129 and 131 are opposed to the central axis of the rear axle 41. .
Further, on the vehicle width outer side surface 83 of the end piece 39, five scale grooves 133 and scale grooves 135 extending in the vertical direction are formed above and below the long hole 81 at substantially constant intervals, respectively.
The upper edge 105 of the inner surface 95 of the axle collar 85 is located slightly below the upper edge 107 of the vehicle width outer surface 83 of the end piece 39, and the lower edge 109 of the inner surface 95 of the axle collar 85 is the vehicle of the end piece 39. Located slightly above the lower edge 111 of the width outer surface 83, the grooves 129 and 131 of the axle collar 85 and the scale grooves 133 and 135 of the end piece 39 can be simultaneously and easily visually recognized. According to this configuration, by adjusting the adjustment bolt 137, the axle collar 85 is moved in the longitudinal direction of the long hole 81 of the end piece 39, and when the rear axle 41 is moved in the same direction, the grooves 129 and 131 of the axle collar 85. Is aligned with the scale grooves 133 and 135 of the end piece 39, so that the rear axle 41 can be accurately positioned.

Next, the end piece 39 will be described.
As shown in FIG. 5, the end piece 39 is formed of a substantially L-shaped extruded material made of an aluminum alloy, and has a wide attachment portion 75 and an axle extending rearward from the attachment portion 75. And a support portion 77.
When the end piece 39 is manufactured, first, an extrusion process is performed in the direction orthogonal to the paper surface of FIG. 5 by an extrusion machine to obtain a long end piece extrusion material (not shown) made of aluminum alloy. At this time, the scale grooves 133 and 135 are formed together by an extruder. Then, after cutting the long end piece extrusion material with a predetermined width to obtain an end piece material (not shown), the machine tool is used to process the outer shape, the R removal, and the long hole 81. To obtain an end piece 39.
In this extrusion process, at the stage of manufacturing the end piece extrusion material (not shown), at least the vehicle width outer side surface 83 of the end piece 39 becomes a smooth flat surface, so no machining is required for the surface. It becomes.

As shown in FIG. 6, the axle collar 85 is formed of an extruded material made of an aluminum alloy, like the end piece 39.
At the time of manufacturing the axle collar 85, the extrusion processing is performed in the direction orthogonal to the paper surface of FIG. 6 by an extrusion processing machine to obtain a long axle collar extrusion material (not shown) having a substantially T-shaped cross section. Then, after a long axle collar extrusion material is cut at a predetermined width to obtain an axle collar material (not shown), the outer shape, the R-removal, the processing of the shaft hole 87, Further, the groove 129 on the upper surface 97 and the groove 131 on the lower surface 99 are processed to obtain a substantially T-shaped axle collar 85.
In the main extrusion process, the extrusion material for the axle collar is formed by extrusion molding using an extrusion processing machine. Therefore, the inner surface 95 of the axle collar 85 becomes a smooth flat surface, and machining on the surface is not necessary.

According to the present embodiment, the inner surface 95 of the axle collar 85 is provided with the protruding portion 113 that protrudes inward in the vehicle width, and the protruding portion 113 is inserted into the long hole 81 of the end piece 39 and locked. Even if the shape for preventing the rotation of the axle collar 85 is not processed in the piece 39 as in the prior art, the rotation of the axle collar 85 can be restricted by the engagement between the projection 113 and the long hole 81. Therefore, the processing cost of the end piece 39 can be reduced by the amount that does not require extra rotation prevention processing.
In this embodiment, the upper edge 105 of the inner surface 95 of the axle collar 85 is substantially along the upper edge 107 of the vehicle width outer surface 83 of the end piece 39, and the lower edge 109 of the inner surface 95 of the axle collar 85 is the end piece. It is substantially along the lower edge 111 of 39 vehicle width outer side surfaces 83. As a result, a large contact area between the axle collar 85 and the end piece 39 can be secured, and the surface pressure generated on the contact surface between the axle collar 85 and the end piece 39 can be reduced by fastening the rear axle 41, so that the rear axle 41 can be firmly fixed. .

Further, in this embodiment, the end piece 39 is formed from the end piece extrusion material, so that the vehicle width outer surface 83 of the end piece 39 becomes a flat surface during extrusion molding, and the vehicle width outer surface 83 is formed by machining. It is not necessary to reduce the machining cost of the end piece 39, and the machining cost can be reduced.
Further, on the vehicle width outer side surface 83 of the end piece 39, scale grooves 133, 135 are provided above and below the long hole 81, and these scale grooves 133, 135 are formed during extrusion processing. There is no need for machining, and the machining cost of the end piece 39 can be reduced to reduce the machining cost.
Further, in the present embodiment, the projection 113 of the axle collar 85 has an upper wall 123, a lower wall 125, and a valley that is recessed outward in the vehicle width at an intermediate portion between the upper wall 123 and the lower wall 125. 127, the thickness of the valley 127 can be reduced, and the weight of the axle collar 85 can be reduced.

As mentioned above, although this invention was demonstrated based on one embodiment, the said embodiment is an example of this invention and is not limited to this.
For example, in the above-described embodiment, a two-wheel straddle-type vehicle is exemplified as a vehicle to which the chain adjuster structure according to the present invention is applied. However, the type of the vehicle is not limited to this, and the number of wheels exceeding three wheels or more than three wheels. It may be a vehicle.

1 Motorcycle (saddle-ride type vehicle)
3 Body frame 5 Engine (power unit)
9 Rear wheel 21 Pivot shaft 23 Swing arm 27 Arm part 37 Rear part 39 End piece (end member)
41 Rear axle (axle)
43 Driven sprocket 59 Drive sprocket 61 Chain 73 Rear end (rear end)
81 Long hole 83 Vehicle width outer side (side)
85 Axle collar 87 Shaft hole 91 Axle nut (nut)
95 Inner surface (inner side of vehicle width direction)
105 Upper edge 107 Upper edge 109 Lower edge 111 Lower edge 113 Projection part 115 Upper surface 117 Lower surface 123 Upper wall part 125 Lower wall part 127 Valley part 133,135 Scale groove (scale line)

Claims (5)

  A body frame (3), a power unit (5) supported by the body frame (3), a drive sprocket (59) provided on an output shaft of the power unit (5), and the drive sprocket (59) The driven sprocket (43), which is driven through the chain (61) and attached to the rear wheel (9), and the rear wheel (9) is pivotally supported at the rear part, and the front part is attached to the vehicle body frame (3). A swing arm (23) pivotally supported is provided, and an end member (39) is fixed to the rear end of the swing arm (23), and the end of the swing arm (23) is fixed to the end member (39). An axle collar (85) is provided with a long hole (81) along the direction, fastened in contact with the side surface (83) of the end member (39), and through which the axle (41) of the rear wheel (9) is inserted. Establishment In the chain adjuster structure of the saddle-ride type vehicle, the protrusion that is inserted into the elongated hole (81) of the end member (39) and locked on the inner side surface (95) in the vehicle width direction of the axle collar (85). A chain adjuster structure for a saddle-ride type vehicle provided with a portion (113).   The upper edge (105) and the lower edge (109) of the axle collar (85) are provided so as to be substantially along the upper edge (107) and the lower edge (111) of the end member (39). The chain adjuster structure for a saddle-ride type vehicle according to claim 1.   2. The end member (39) according to claim 1, wherein a rear portion of the end member (39) is formed of an L-shaped extruded material when viewed from the top and bottom directions, and the elongated hole (81) is provided by machining. Chain adjuster structure for saddle-ride type vehicles.   Scale lines (133, 135) are provided above and below the elongated hole (81) of the end member (39), and the scale lines (133, 135) are integrally formed by extrusion molding. A chain adjuster structure for a saddle-ride type vehicle according to claim 3.   The projection (113) of the axle collar (85) comprises an upper wall (123) and a lower wall (125) having a valley (127) in the middle. Chain adjuster structure for saddle riding type vehicles as described.

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