JP5715486B2 - Motorcycle chain adjuster structure - Google Patents

Description

  The present invention relates to a chain adjuster structure for a motorcycle.

  Patent Document 1 discloses a structure in which a chain adjuster that adjusts the tension of a drive chain by adjusting the longitudinal position of the wheel shaft is provided in a swing arm of a motorcycle (see Patent Document 1).

  In the above structure, the chain adjuster includes a collar through which the axle is inserted, a flat washer portion that is coupled to the collar to define the vertical position of the axle, and an adjustment screw that is coupled to the washer portion. It is inserted from the rear end opening. The adjuster screw passes through an end cap that covers the rear end opening of the swing arm and is screwed with a nut outside the end cap. By adjusting this nut, adjustment by the chain adjuster is possible.

JP 2009-208618 A

  In the structure according to Patent Document 1, the wheel side of the opening formed to allow the rear wheel axle to pass through the swing arm is not closed, so that the collar constituting the chain adjuster can be enlarged, It is preferable to provide a structure that waterproofs the opening, for example, by devising the structure, but when the collar is enlarged, the structure of the chain adjuster becomes complicated and the manufacturing cost increases, and the weight There is a problem that an increase occurs.

  The present invention has been made in view of such circumstances, and it is a motorcycle that can easily improve the waterproofness of an opening for allowing a wheel shaft to pass through a swing arm, and reduce the manufacturing cost and weight. The purpose is to provide a chain adjuster structure.

As a means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a swingable swing arm (11) holding a wheel shaft (29) at the rear part, a power unit (9), and the wheel shaft (29). A motorcycle (1) having a drive chain (32) wound around and transmitting a driving force, and a pair of left and right elongated holes (42R) through which the wheel shaft (29) passes through the swing arm (11) And an opening (46) is formed at the rear end of the swing arm (11), and the front and rear positions of the wheel shaft (29) are adjusted from the opening (46) into the swing arm (11). In the chain adjuster structure of the motorcycle (1), the chain adjuster (45R) to be inserted is inserted and the opening (46) is covered with the end cap (51).
The chain adjuster (45R) is formed long in the longitudinal direction of the swing arm (11) and has a first plate-like portion (47) that closes one of the elongated holes (42R), and the first plate-like portion A collar portion (48) that is fixed to the portion (47) and allows the wheel shaft (29) to be inserted into an inner periphery thereof, and the collar so as to sandwich the first plate-like portion (47) and the collar portion (48). A second plate-like part (49) fixed to the part (48) and formed in the longitudinal direction of the swing arm (11) to close the other (42R) of the elongated hole, An adjuster screw (50) penetrating the end cap (51) is coupled to either the first plate-like portion (47) or the second plate-like portion (49), and the adjuster screw (50) nut (52) is screwed to the end portion of the through side, the first plate Part (47), said second plate portion (49), said collar (48), and said adjuster screw (50), respectively, characterized in that consists of separate members.

  According to a second aspect of the present invention, in the chain adjuster structure of the motorcycle according to the first aspect, an adjuster screw (50) passing through the end cap (51) is coupled to the first plate-like part (47). The plate thickness of the first plate portion (47) is larger than the plate thickness of the second plate portion (49).

  According to a third aspect of the present invention, in the chain adjuster structure of the motorcycle according to the second aspect, the vertical width of the first plate-like portion (47) is greater than the height of the internal space of the swing arm (11). Convex portions (54, 55) that are formed small and that define the vertical position of the chain adjuster (45R) are formed at the vertical position of the connecting portion with the collar portion (48) in the second plate-like portion (49). It is characterized by being.

  According to a fourth aspect of the present invention, in the chain adjuster structure of the motorcycle according to the second or third aspect, the swing arm (11: 28L, 28R) is configured as a pair of left and right, and the chain adjuster (45L, 45R). Are provided on the pair of left and right swing arms (28L, 28R), the wheel shaft (29) is constituted by a bolt, and the head (29A) of the bolt is attached to one of the swing arms (28R). Abutting from the outside in the vehicle width direction, the front end (29C) side of the bolt is disposed so as to penetrate the other side (28L) of the swing arm via the chain adjuster (45L). The second plate-like portion (49) of the chain adjuster (45L) located on the side of the bolt is connected to the head (29A) of the bolt. Characterized in that it is arranged.

According to the first aspect of the present invention, by blocking the long hole of the swing arm with the first and second plate-like portions, the waterproof property to the inside of the swing arm can be easily improved, and the manufacturing cost can be suppressed. it can. Moreover, since waterproofness can be improved with a simple structure that does not require a separate member, an increase in weight can be suppressed. Moreover, since each member is comprised by another member, a shaping | molding process can be performed easily and productivity can be aimed at.

  According to the second aspect of the present invention, it is necessary to make the plate thickness of the first plate-like portion, which requires rigidity for adjusting the longitudinal position by the adjuster screw, larger than the plate thickness of the second plate-like portion. The increase in the above weight can be suppressed and weight reduction can be achieved.

  According to invention of Claim 3, since the convex part for prescribing | regulating an up-and-down position is formed in the 2nd plate-shaped part used as plate | board thickness small, weight reduction can be achieved further.

  According to the fourth aspect of the present invention, when inserting the wheel shaft constituted by the bolt into the collar portion, the bolt can be inserted from the second plate-shaped portion whose vertical position is restricted. Can be improved.

1 is a left side view of a motorcycle including a chain adjuster to which a structure according to an embodiment of the present invention is applied. Fig. 3 is a rear view of the main part behind the motorcycle. It is sectional drawing which follows the AA line of FIG. It is a disassembled perspective view of the said chain adjuster. It is a right view of the said chain adjuster. It is a top view of the chain adjuster. It is a left view of the said chain adjuster. It is sectional drawing which follows the BB line of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings used for the following description, an arrow FR in the figure indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow LH indicates the left side of the vehicle.

  FIG. 1 shows a motorcycle 1 having a chain adjuster employing a chain adjuster structure according to this embodiment. First, a body frame 2 of the motorcycle 1 includes a head pipe 3 provided at a front end, and a head pipe 3. A main frame 4 extending obliquely downward and rearward; a pivot plate 5 attached to a rear end of the main frame 4; a pair of left and right seat rails 6 extending obliquely upward and rearward from the rear end of the main frame 4; The rear part and a pair of left and right sub-frames 7 installed on the seat rail 6 are configured.

  A pair of left and right front forks 8 are steerably attached to the head pipe 3, and an engine 9 as a power unit is attached to the engine hanger 4 A and the pivot plate 5 of the main frame 4. A pair of left and right swing arms 11 are swingably attached to the pivot plate 5 via a pivot shaft 10, and a fuel tank 12 is attached to the seat rail 6.

  The front fork 8 is connected to the steering stem 13 at the upper part thereof, a bar handle 14 is attached to the upper part of the steering stem 13, and a front wheel 15 is attached to the lower end of the front fork 8. The engine 9 is provided with a transmission 16 integrally at the rear, and is disposed substantially horizontally long in the front-rear direction. A cylinder block 18 is attached to the crankcase 17 of the engine 9, and a cylinder head 19 is attached to the cylinder block 18.

  An intake device 20 is attached to the upper part of the cylinder head 19, and an exhaust pipe 21 is attached to the lower part of the cylinder head 19. The intake device 20 includes a carburetor 23 connected to the cylinder head 19 via an intake pipe 22 and an air cleaner 24 connected to the carburetor 23 via a connecting tube (not shown). A muffler 25 is connected to the rear end of the exhaust pipe 21.

  In the transmission 16, an output shaft 26 protrudes laterally from the side surface of the crankcase 17, and a drive sprocket 27 is attached to the output shaft 26. The swing arm 11 includes a pair of left and right arm portions 28L and 28R extending in the front-rear direction. A wheel shaft 29, which is a wheel shaft, is passed to the rear ends of the arm portions 28L and 28R. Is supported.

  A driven sprocket 31 is integrally provided on the rear wheel 30, and a drive chain 32 is wound around the drive sprocket 27 and the driven sprocket 31. Further, a pair of left and right rear cushion units 33 are interposed between the rear end portion of the swing arm 11 and the seat rail 6. Referring to FIGS. 2 and 3, the rear wheel 30 has a wheel 35 for attaching a tire 34, and the wheel 35 integrally includes a central hub portion 36 and a plurality of spoke portions 37 extending radially from the hub portion 36. The hub portion 36 is supported so as to be rotatable with respect to the wheel shaft 29 via bearings 38, 38 which are disposed offset to the left and right of the wheel shaft 29.

  The driven sprocket 31 is fixed to a disc-shaped base plate 39 rotatably supported on the wheel shaft 29 on the left side of the hub portion 36, and the base plate 39 has an elastic member (not shown) attached to the hub portion 36. Thus, the rotation from the drive chain 32 is transmitted to the rear wheel 30. On the other hand, a brake disc 41 is fixed to the right side wall portion of the hub portion 36.

  The arm portions 28L and 28R of the swing arm 11 are each formed from a square pipe material. As shown in FIG. 1, a pair of long holes 42L and a pair of long holes 42R are formed on both sides of each rear portion. In the drawing, only the left side 42L is shown, but 42R is shown in parentheses for convenience. The wheel shaft 29 is inserted into the pair of left elongated holes 42L and the pair of right elongated holes 42R, and is movable back and forth by the length of the elongated holes 42L and 42R in the longitudinal direction. Here, as shown in FIGS. 2 and 3, the wheel shaft 29 is formed of a bolt, and integrally includes a head portion 29A and a shaft portion 29B.

  The wheel shaft 29 is moved by chain adjusters 45L and 45R provided on the left and right arm portions 28L and 28R, respectively (see FIG. 3). With reference to FIG. 4, the chain adjuster 45R provided on the right arm portion 28R is shown. ing. Hereinafter, only the configuration of the right chain adjuster 45R will be described, but the description will be omitted because the chain adjuster 45L has the same configuration. As shown in FIG. 4, the chain adjuster 45R is inserted through an opening 46 formed at the rear end of the arm portion 28R.

  4 to 8, the chain adjuster 45R is disposed on the right side and is formed in the longitudinal direction of the arm portion 28R so as to be long and close the right slot 42R. A collar portion 48 that is fixed to one plate-like portion 47 by welding and allows the wheel shaft 29 to be inserted into the inner periphery, and is fixed to the collar portion 48 so as to sandwich the first plate-like portion 47 and the collar portion 48 and arranged on the left side. And a second plate-like portion 49 that is elongated in the longitudinal direction of the arm portion 28R and closes the left-side elongated hole 42R. The first plate-like portion 47 has an opening portion of the arm portion 28. An adjuster screw 50 facing outward from 46 is fixed by welding.

  The first plate-like portion 47, the second plate-like portion 49, the collar portion 48, and the adjuster screw 50 are made of different members, and are fixed by welding. The first plate-like portion 47 and the second plate-like portion 49 are formed with through-holes 47A and 49A through which the wheel shaft 29 is inserted so as to be continuous with the inner periphery of the collar portion 48, respectively. The shape portion 49 is welded with the through holes 47 </ b> A and 49 </ b> A along the inner peripheral edge of the collar portion 48. The adjuster screw 50 is welded to the inner surface of the first plate-like portion 47 and extends along the longitudinal direction of the first plate-like portion 47.

  As shown in FIGS. 2 and 4, the opening 46 at the rear end of the arm portion 28 </ b> R is covered with an end cap 51, and the adjuster screw 50 passes through the end cap 51 and faces the outside of the arm portion 28 </ b> R. An adjustment nut 52 and a positioning nut 53 are screwed into the end facing the outside in order from the end cap 51. The end cap 51 is fixed to the opening 46 by fitting or the like and is detachably attached from the opening 46.

  Referring to FIG. 6, the plate thickness T1 of the first plate-like portion 47 to which the adjuster screw 50 is coupled is formed larger than the plate thickness T2 of the second plate-like portion 49, while referring to FIG. The vertical width of the plate-like portion 47 is formed to be smaller than the height of the internal space of the arm portion 28R. Further, as shown in FIGS. 5 and 7, etc., the upper plate 54 and the lower side for defining the vertical position of the chain adjuster 45R are provided at the upper and lower positions of the connecting portion of the second plate-like portion 49 with the collar portion 48. A convex portion 55 is formed. The upper convex portion 54 and the lower convex portion 55 are formed with flat tips, and define the vertical position by contacting the upper and lower inner walls of the arm portion 28R.

  The upper convex portion 54 and the lower convex portion 55 are formed substantially in the center in the front-rear direction (longitudinal direction) of the second plate-shaped portion 49, and abut against the upper and lower inner walls of the arm portion 28R with a relatively small surface, The sliding resistance of the chain adjuster 45R is minimized. On the other hand, as shown in FIGS. 4 and 5, a scale 57 that is visible from the outside through the long hole 42 </ b> R is provided on the surface of the second plate-like portion 49 on the long hole 42 </ b> R side. Since the scale 57 is formed on the first plate-like portion 47 side where the plate thickness is large, even if the scale 57 is molded by a press or the like, it is possible to reduce the influence on the rigidity.

  Here, as shown in FIG. 3, the wheel shaft 29 is inserted from the right arm portion 28L, and its head portion 29A is brought into contact with the wall portion of the arm portion 28R from the outside in the vehicle width direction. The distal end 29C is inserted through the left arm portion 28L and then fixed by the fastening nut 56. The relationship between the insertion direction of the wheel shaft 29 and the arrangement of the chain adjusters 45L and 45R will be described. Of the chain adjusters 45L and 45R, the one on the side where the tip 29C of the wheel shaft 29 is located is the upper convex portion 54 and It arrange | positions so that the 2nd plate-shaped part 49 in which the lower side convex part 55 is formed may be located in the side (head 29A side) in which the wheel shaft 29 is inserted first.

  In the chain adjusters 45L and 45R configured as described above, when the adjustment nut 52 and the positioning nut 53 are loosened and their front and rear positions are adjusted, the chain adjusters 45L and 45R are movable in the longitudinal direction of the swing arm 11 (arm portions 28L and 28R). This allows the tension of the drive chain 32 to be adjusted.

  As described above, the chain adjuster 45R according to this embodiment includes the first plate-like portion 47 that is elongated in the longitudinal direction of the arm portion 28R of the swing arm 11 and closes one of the long holes 42R, A collar portion 48 that is fixed to the one plate-like portion 47 and allows the wheel shaft 29 to be inserted into the inner periphery thereof, and is fixed to the collar portion 48 so as to sandwich the first plate-like portion 47 and the collar portion 48, and the longitudinal length of the arm portion 28R. And a second plate-like portion 49 that is formed in a long direction and closes the other of the long holes 42 </ b> R, and an adjuster screw 50 that penetrates the end cap 51 is coupled to the first plate-like portion 47. The adjustment nut 52 is screwed into the end of the adjuster screw 50 on the through side.

  When such a structure is used, by closing the elongated hole 42R of the arm portion 28R with the first and second plate-like portions 47, 49, the waterproof property to the inside of the swing arm can be easily improved, and the manufacturing cost is reduced. In addition, since the waterproof property can be improved with a simple structure that does not require a separate member, an increase in weight can be suppressed. Further, the chain adjuster 45R has a structure in which the plate thickness of the first plate-like portion 47 is formed larger than the plate thickness of the second plate-like portion 49, and rigidity is required for the front-rear position adjustment by the adjuster screw 50. By making the plate thickness of the first plate-like portion 47 larger than the plate thickness of the second plate-like portion 49, an increase in the weight more than necessary can be suppressed and the weight can be reduced. In addition, even if the plate | board thickness of the 1st and 2nd plate-shaped part is the same, the effect of Claim 1 is satisfied.

  Further, in the chain adjuster 45R, the vertical width of the first plate-like portion 47 is formed smaller than the height of the internal space of the arm portion 28R, and the vertical position of the connecting portion with the collar portion 48 in the second plate-like portion 49. In addition, an upper convex portion 54 and a lower convex portion 55 that define the vertical position of the chain adjuster 45R are formed. In such a structure, the vertical position is defined in the second plate-like portion 49 having a small plate thickness. In order to form the convex part for doing, weight reduction can be achieved further.

  In the chain adjuster 45R, the wheel shaft 29 is constituted by a bolt, the head portion 29A of the bolt abuts the arm portion 28R from the outside in the vehicle width direction, and the tip 29C side of the bolt connects the arm portion 28L to the chain. The second plate-like portion 49 of the chain adjuster 45L, which is disposed so as to penetrate through the adjuster 45L and is located on the tip 29C side of the bolt (wheel shaft 29), is disposed on the bolt head 29A side. In such a structure, when the wheel shaft 29 composed of bolts is inserted into the collar portion 48, the bolts can be inserted from the second plate-like portion 49 whose vertical position is restricted, so that the assembling property is improved. can do.

  Note that the wheel shaft 29 composed of bolts is inserted into the chain adjusters 45L and 45R located on the bolt front end side from either the left or right side from the second plate-like portion 49 side. Normally, the chain adjuster located on the first insertion side (bolt head side) is easy to check the position of the long hole when assembling the bolt, but the end of the bolt cannot be seen when assembling on the reverse side. However, with the above configuration, the second plate-like portion 49 regulates the vertical position, so that the assembling property is improved.

  Furthermore, in the chain adjuster 45R, the first plate-like portion 47, the second plate-like portion 49, the collar portion 48, and the adjuster screw 50 are each constituted by separate members. Molding can be easily performed, and productivity can be improved. Although the description of the left chain adjuster 45L is omitted, the same effect is obtained.

1 Motorcycle 11 Swing arm 28L, 28R Arm part (swing arm)
29 Wheel shaft 32 Drive chain 42R Slot 45L, 45R Chain adjuster 46 Opening 47 First plate-like portion 48 Collar portion 49 Second plate-like portion 50 Adjuster screw 51 End cap 52 Adjustment nut (nut)
54 Upper convex part (convex part)
55 Lower convex part (convex part)

Claims (4)

A swingable swing arm (11) holding a wheel shaft (29) at the rear, and a drive chain (32) wound around the power unit (9) and the wheel shaft (29) to transmit driving force. The motorcycle (1) is formed with a pair of left and right elongated holes (42R) for allowing the wheel shaft (29) to pass through the swing arm (11), and opened at the rear end of the swing arm (11). A chain adjuster (45R) for adjusting the front and rear positions of the wheel shaft (29) is inserted into the swing arm (11) from the opening (46), and the opening (46 ) In the chain adjuster structure of the motorcycle (1) that covers the end cap (51).
The chain adjuster (45R) is formed long in the longitudinal direction of the swing arm (11) and has a first plate-like portion (47) that closes one of the elongated holes (42R), and the first plate-like portion A collar portion (48) that is fixed to the portion (47) and allows the wheel shaft (29) to be inserted into an inner periphery thereof, and the collar so as to sandwich the first plate-like portion (47) and the collar portion (48). A second plate-like part (49) fixed to the part (48) and formed in the longitudinal direction of the swing arm (11) to close the other (42R) of the long hole,
An adjuster screw (50) passing through the end cap (51) is coupled to either the first plate-like portion (47) or the second plate-like portion (49), and the adjuster screw (50). nuts (52) on the end of the penetration side is screwed,
The motorcycle, wherein the first plate-like portion (47), the second plate-like portion (49), the collar portion (48), and the adjuster screw (50) are each constituted by separate members. Chain adjuster structure. An adjuster screw (50) passing through the end cap (51) is coupled to the first plate-like portion (47),
The chain adjuster structure for a motorcycle according to claim 1, wherein the plate thickness of the first plate portion (47) is formed larger than the plate thickness of the second plate portion (49).   The first plate-like portion (47) has a vertical width smaller than the height of the internal space of the swing arm (11), and is coupled to the collar portion (48) in the second plate-like portion (49). 3. The chain adjuster structure for a motorcycle according to claim 2, wherein convex portions (54, 55) for defining the vertical position of the chain adjuster (45R) are formed at the vertical position of the part. The swing arms (11: 28L, 28R) are composed of a pair of left and right, and the chain adjusters (45L, 45R) are provided on the pair of left and right swing arms (28L, 28R), respectively.
The wheel shaft (29) is constituted by a bolt, the head (29A) of the bolt abuts against one of the swing arms (28R) from the outside in the vehicle width direction, and the tip (29C) side of the bolt is the swing The other arm (28L) is arranged to penetrate through the chain adjuster (45L),
The said 2nd plate-shaped part (49) of the said chain adjuster (45L) located in the front-end | tip (29C) side of the said bolt is arrange | positioned at the head (29A) side of the said bolt. The chain adjuster structure for a motorcycle according to 2 or 3.