JP2008075732A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle securing a sufficient space around a gear case. <P>SOLUTION: The motorcycle 10 comprises the gear case 54 provided sideways from a rear wheel 35 and filled with oil, and a breather passage 151 provided in the gear case 54 for communicating the inside of the case with outside air, wherein the output of a power unit is transmitted via the gear case 54 to the rear wheel 35. It has an annular recessed portion 142 around an axle 36 of the rear wheel 35, and an annular protruded portion 144 provided on a hub 76 of the rear wheel and fitted to the annular recessed portion 142 to form a labyrinth structure 143. A breather tube 89 is provided extending downward along the annular recessed portion 142. In details, a ring member 88 having the annular recessed portion 142 is attached to the gear case 54, and the breather tube 89 is provided extending from a breather tube storage portion 146 of the ring member 88. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motorcycle including a gear case containing oil on the side of a rear wheel, and a breather passage communicating with the outside of the gear case.

A motorcycle equipped with a gear case containing oil on the side of the rear wheel, equipped with a breather passage communicating with the outside air inside the case, and the output of the power unit is transmitted to the rear wheel via the gear case is known. (For example, refer to Patent Document 1).
Japanese Utility Model Publication 2-393 (Fig. 6)

  In FIG. 6 of Patent Document 1, a pair of gear sets 3 and 4 that transmit the driving force of the propeller shaft to the rear wheel 6 are provided in the final gear case main body 21 (the reference numeral is the same as that of the same publication). Oil is contained inside the final gear case main body 21 (hereinafter referred to as the gear case 21).

The gear case 21 is formed with a chamber 23 communicating with the outside air inside the case, and the chamber 23 is covered with a cap 31 via a pipe member 27.
Since the chamber 23 is formed inside the gear case 21 and the cap 31 is covered by the side portion of the rear wheel 6, the appearance of the vehicle is not impaired.

  However, since the chamber 23 is formed inside the gear case 21, the gear case 21 becomes large. When the gear case 21 becomes large, there is a possibility that the arrangement of the components may be restricted when the components are arranged around the gear case 21.

  An object of the present invention is to provide a motorcycle that can secure a sufficient space around a gear case.

  The invention according to claim 1 is provided with a gear case containing oil on the side of the rear wheel, the gear case having a breather passage communicating with the outside air inside the case, and the output of the power unit is transmitted to the rear wheel through the gear case. In the motorcycle, the breather passage is composed of a breather hole provided in the upper part of the gear case and a breather tube connected to the breather hole, and the rear side of the gear case facing the rear wheel is centered on the axle of the rear wheel. An annular concave portion is provided, and an annular convex portion that fits into the annular concave portion to form a labyrinth structure is provided in the hub of the rear wheel, and the breather tube is extended downward along the annular concave portion.

  The invention according to claim 2 is characterized in that the annular recess is provided in a ring member attached to the gear case, and a claw portion for stopping the breather tube is integrally formed on the ring member.

  According to a third aspect of the present invention, an oil injection hole is provided on the surface of the gear case, a breather hole is provided on the back surface of the gear case, a tube member is inserted into the breather hole from the back surface to the surface, and a breather tube is inserted into the tube member. One end is connected, and when the oil is injected with the front side facing up and the back side facing down, the tip of the pipe member comes out above the injected oil.

  In the invention according to claim 1, the breather passage is constituted by a breather hole provided in the upper part of the gear case and a breather tube connected to the breather hole, and the rear surface of the gear case facing the rear wheel is centered on the axle of the rear wheel. An annular convex portion that is fitted to the annular concave portion to form a labyrinth structure is provided in the hub of the rear wheel, and the breather tube is extended downward along the annular concave portion.

  Since the breather passage is not formed inside the gear case, it is not necessary to enlarge the gear case. Since the gear case does not become large, a sufficient space can be secured around the gear case.

  In the invention according to claim 2, since the annular recess is provided in the ring member attached to the gear case, and the claw portion for stopping the breather tube is integrally formed on the ring member, the structure for locking the breather tube can be simplified. . In addition, the number of parts of the locking portion for locking the breather tube can be reduced, and the assembly of the breather tube to the locking portion can be easily performed.

In the invention according to claim 3, an oil injection hole is provided on the surface of the gear case, a breather hole is provided on the back surface of the gear case, a tube member is inserted into the breather hole from the back surface to the surface, and a breather tube is inserted into the tube member. One end is connected, and when the oil is injected with the front side facing up and the back side facing down, the tip of the pipe member comes out above the injected oil.
When the oil is poured from above with the surface facing up, the oil surface of the oil is lower than the tip of the tube member inserted toward the surface, so there is no concern that the oil enters the tube member. Since oil does not enter the pipe member, the breather function can be exhibited well.

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 left side view of a motorcycle according to the present invention.
The motorcycle 10 includes a body frame 11, a head pipe 13 provided at the front end of the vehicle, a main frame 14 extending rearward from the head pipe 13, and a rear end of the main frame 14. Seat rails 15, 15 extending rearward from the section (only the reference numeral 15 on the front side is shown), and down frames 16, 16 extending only obliquely downward from the head pipe 13 (only the reference numeral 16 on the front side is shown). , Rear frames 17 and 17 (only the reference numeral 17 on the front side is shown) connecting the rear ends of the down frames 16 and 16 and the rear ends of the seat rails 15 and 15, and pivot shafts on the rear frames 17 and 17. 19 is rotatably attached, and a rear fork 21 is attached so as to be swingable up and down around the pivot shaft 19, and a front portion 22 of the rear fork 21. A vehicle composed of a rear cushion unit 25 which connects the rear 23 of the main frame 14.

  In the motorcycle 10, a front fork 28 is attached to the head pipe 13 so as to be steerable, a front wheel 29 is rotatably attached to a lower end of the front fork 28, a steering handle 31 is attached to an upper portion of the front fork 28, and a main frame. 14 and the down frame 16, an engine 33 as a power unit 32 is disposed, a rear wheel 35 is rotatably attached to the rear end 21 b of the rear fork 21, and a rear wheel axle that supports the rear wheel 35 is supported. A shaft drive device 40 that transmits the driving force of the engine 33 to the rear wheel 35 is disposed between the engine 36 and the engine 33.

  The engine 33 is a V-type two-cylinder engine that includes a crankcase 41 and two cylinder portions 42F and 42R raised from the crankcase 41. The fuel supply device, exhaust pipe, and silencer are omitted.

  45 is a fuel tank, 46 is a driver's seat, 47 is a rear fender, 48 is a headlight, 49 is a taillight, 51 and 51 (only the reference 51 is shown) is a rear turn signal, and 52 is a vehicle body frame 11. It is a gusset member.

FIG. 2 is a rear left side view of the motorcycle according to the present invention.
In the motorcycle 10, a rear fork 21 is provided so as to be swingable up and down via a pivot shaft 19 from a rear frame 17 constituting a part of the body frame 11, and a rear wheel 35 is provided at a rear end portion 21b of the rear fork 21. A gear case 54 is provided on the side of the rear wheel 35, a drive shaft 56 is provided between the gear case 54 and the output shaft 55 of the engine 33 as the power unit 32, and the output of the engine 33 is connected to the drive shaft 56 and the gear case. This is transmitted to the rear wheel 35 via 54.

  The gear case 54 is supported by a rear wheel axle 36 provided at the rear end portion 21 b of the rear fork 21 and is prevented from rotating by a torque rod 57 that connects the outer peripheral portion 54 g of the gear case 54 and the rear fork 21. ing.

A rear frame 61 extends rearward from the seat rails 15 and 15 (only the reference numeral 15 on the front side in the figure), and a rear fender 47, a passenger seat 62, and the like are attached to the rear frame 61.
In the figure, 63 is a bracket that is provided at the rear of the main frame 14 and holds the upper end 25t of the rear cushion unit 25.

  FIG. 3 is a cross-sectional view for explaining the shaft drive device and its peripheral portion of a motorcycle according to the present invention. Hereinafter, the structure of the shaft drive device 40 will be described first, and then the rear fork 21 that supports the shaft drive device 40 and the rear wheel 35 will be described.

  The shaft drive device 40 is a device that plays a role of changing the direction of the drive force of the drive shaft 56 and the drive shaft 56 and transmitting it to the rear wheel 35. The structure of the shaft drive device 40 includes a drive shaft 56 attached to an output shaft 55 of an engine (reference numeral 33 in FIG. 2) via a universal joint 65, and a drive shaft side gear 66 attached to a rear end portion 56b of the drive shaft 56. The drive gear 67, the final driven gear 68 that meshes with the drive gear 67 and changes the direction of the driving force, and the gear case 54 that houses the gears 67 and 68 are mainly configured.

The final driven gear 68 is press-fitted into the sleeve 73. The sleeve 73 is supported by bearings 94 and 96. A damper holder 74 is attached to the sleeve 73 and rotates integrally with the sleeve 73, and a damper member 75 is attached to the damper holder 74 via a bolt 77.
A bearing 72 is disposed on the outer periphery of the rear wheel axle 36 via a spacer 71, and a final gear unit including the gear case 54 is supported by the bearing 72 and another bearing 95.

  A shock absorber is provided between the final driven gear 68 and the rear wheel 35. In the present embodiment, the shock absorber is a damper member 75. The damper member 75 is interposed between the final driven gear 68 and the hub 76 of the rear wheel 35 to transmit the torque of the drive shaft 56 to the rear wheel 35 and to reduce shock due to torque fluctuation.

  The gear case 54 includes a main body 81 and a lid 82 that covers the main body 81 from the inside of the vehicle to the outside. Then, the lid portion 82 is aligned with the main body portion 81 and fixed with the fastening member 83. A gear chamber 84 is formed inside the gear case 54, and a drive gear 67 and a final driven gear 68 that meshes with the drive gear 67 are disposed in the gear chamber 84. The gear chamber 84 includes an oil injection hole 85 through which oil is injected. The oil injection hole 85 is normally closed with a cap 86.

A dust guard plate 87 as a ring member 88 is attached to the lid portion 82 from the inside, and a breather tube 89 communicating with the gear chamber 84 and the atmosphere is attached to the dust guard plate 87.
In the drawing, 91 to 94, 96 and 97 are bearings, 101 to 105 are seal members, 107 is a disc brake unit, 108 is a disc brake plate, and 109 is a nut for fixing the rear wheel axle 36 to the rear fork 21.

  The rear fork 21 includes one extending part 111, the other extending part 112, and a cross part 113 that connects the one extending part 111 and the other extending part 112.

One extension part 111 and the cross part 113 are integrally formed by casting. The other extending portion 112 is obtained by connecting a solid member 135 to a square pipe 134.
That is, the rear fork 21 is formed by connecting a plurality of members, and the connecting method of these members is by welding. By making the rear fork 21 into a divided configuration, it is possible to easily perform casting of a portion forming the one extending portion 111 and the cross portion 113.

4 is a cross-sectional view of the gear case according to the present invention. The gear case 54 includes an annular recess 142 centered on the rear wheel axle 36 on the back surface 141 facing the rear wheel (reference numeral 35 in FIG. 3). The annular recess 142 is provided in the ring member 88 attached to the gear case 54.
An annular convex portion 144 that fits into the annular concave portion 142 to form a labyrinth structure 143 is provided on a rear wheel hub (reference numeral 76 in FIG. 3), and a breather tube storage portion 146 is formed inside the annular concave portion 142.
An oil injection hole 85 is provided on the surface 147 of the gear case 54, and a cap 86 for closing the oil injection hole 85 is provided in the oil injection hole 85.

  3 and 4, the labyrinth structure is formed by aligning the annular convex portion 144 provided on the hub 76 side of the rear wheel 35 with the annular concave portion 142 provided on the dust guard plate 87 as the ring member 88 on the gear case 54 side. By forming 143, foreign matter can be prevented from entering the bearing 72, the bearing 93, and the like. In the present invention, the breather tube 89 is disposed inside the labyrinth structure 143 so that the labyrinth structure 143 has a function of covering the breather tube 89 as well as a dustproof function.

FIG. 5 is a view taken in the direction of arrow 5 in FIG. 4. A breather tube storage portion 146 is provided along the annular recess 142. The breather tube storage portion 146 stores the breather tube 89 and extends the breather tube 89 downward. It was.
The annular recess 142 is provided in the ring member 88 attached to the gear case 54, and claw portions 148... (...) for stopping the breather tube 89 in the breather tube storage portion 146 of the ring member 88 are plural. ) Were integrally formed.

  Since the annular recess 142 is provided in the ring member 88 attached to the gear case 54 and the claw portions 148... For stopping the breather tube 89 are integrally formed on the ring member 88, the locking structure of the breather tube 89 is simplified. Can do. In addition, the number of parts of the locking part for locking the breather tube 89 can be reduced, and the assembly of the breather tube 89 to the locking part can be easily performed.

Further, since the lower portion of the breather tube 89 is disposed at the gear case 54 and the rear wheel hub (lower portion of the reference numeral 76 in FIG. 3), the breather tube 89 can be hardly seen from the outside.
Thus, since the breather tube 89 is made difficult to be seen from the outside, the appearance around the gear case 54 can be improved.

  Moreover, since the breather passage 151 is not formed inside the gear case 54, the gear case 54 does not become large, and the appearance of the vehicle does not deteriorate.

  6 is a cross-sectional view taken along line 6-6 in FIG. 5. The breather passage 151 includes a breather hole 152 provided in the upper portion of the gear case 54 and a breather tube 89 connected to the breather hole 152. A tube member 155 composed of a first tube member 153 and a second tube member 154 is inserted, and the tip 153t of the first tube member 153 is disposed so as to be close to the outermost surface S in the gear case 54, and the first tube The tip 154t of the second tube member 154 is brought into contact with the end 153b of the member 153, and one end 89a of the breather tube 89 is connected to the end 154b of the second tube member 154.

  That is, an oil injection hole (reference numeral 85 in FIG. 3) is provided on the surface 147 of the gear case 54, a breather hole 152 is provided on the back surface 141 of the gear case 54, and the pipe member 155 is provided in the breather hole 152 from the back surface 141 toward the surface 147. The one end 89 a of the breather tube 89 is connected to the tube member 155.

FIG. 7 is a view for explaining the structure and operation of the pipe member, and the tip 153t of the first pipe member 153 constituting one of the pipe members 155 is configured to come out above the surface of the injected oil.
In (a), the cap 86 is removed with the front surface 147 of the gear case 54 facing up and the back surface 141 facing down, and oil is injected from the oil cup C into the oil injection hole 85 of the gear case.
(B) shows the breather channel | path 151 before inject | pouring oil, (c) shows the breather channel | path 151 after inject | pouring oil.

  When oil is injected from above with the surface 147 of the gear case 54 facing up and the back surface 141 facing down, the tip 155t of the pipe member 155 is configured to come out above the oil level M of the injected oil.

  When oil is injected from above with the surface 147 facing upward, the oil level M of the oil is lower than the tip 155t of the tube member 155 inserted toward the surface 147, so there is no concern that the oil will enter the tube member 155. Absent. Since oil does not enter the pipe member 155, the breather function can be satisfactorily exhibited.

The operation of the motorcycle gear case described above will be described next.
3 to 5, the breather passage 151 includes a breather hole 152 provided in an upper portion of the gear case 54 and a breather tube 89 connected to the breather hole 152, and the rear surface where the gear case 54 faces the rear wheel 35. 141 includes an annular concave portion 142 centered on the rear wheel axle 36, and an annular convex portion 144 that fits into the annular concave portion 142 to form a labyrinth structure 143 is provided on the hub 37 of the rear wheel 35. Along with this, the breather tube 89 was extended downward.

  Since the breather passage 151 is not formed inside the gear case 54, it is not necessary to enlarge the gear case 54. Since the gear case does not become large, a sufficient space can be secured around the gear case 54, and there is no restriction on the arrangement of parts around the gear case 54.

FIG. 8 is a view for explaining the arrangement of the breather tube. The breather tube 89 is connected to a breather hole 152 provided in the upper part 54c of the gear case 54, and extends downward along an annular recess 142 provided in the ring member 88. The lower portion 89d of the breather tube 89 is positioned below the gear case 54 and the rear wheel hub 76.
The lower portion 89d of the breather tube 89 is disposed below the gear case 54 and the rear wheel hub 37 and is in a position that is difficult to see, so that the appearance of the vehicle is not impaired.

  By extending the breather tube 89 downward long, it is possible to make it difficult for foreign matter to enter the gear case 54. Also, there is no concern that oil in the gear case leaks when the vehicle is tilted.

  The breather tube 89 extends long downward, and the lower portion 89d of the breather tube 89 is disposed below the gear case 54 and the rear wheel hub 37. However, the breather tube 89 can be shortened as appropriate. The length of can be arbitrarily set.

  In claim 1, the ring member may be omitted and the groove portion may be directly formed in the gear case.

  The present invention is suitable for a gear case of a motorcycle having a breather passage.

1 is a left side view of a motorcycle according to the present invention. 1 is a rear left side view of a motorcycle according to the present invention. It is sectional drawing explaining the shaft drive apparatus which concerns on this invention, and its periphery part. It is sectional drawing of the gear case which concerns on this invention. FIG. 5 is a view taken in the direction of arrow 5 in FIG. 4. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is a figure explaining the structure and effect | action of a pipe member. It is a figure explaining arrangement | positioning of a breather tube.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 32 ... Power unit, 35 ... Rear wheel, 36 ... Rear axle, 54 ... Gear case, 76 ... Rear wheel hub, 85 ... Oil injection hole, 88 ... Ring member, 89 ... Breather tube, 89a ... One end of breather tube, 141 ... rear surface of gear case, 142 ... annular recess, 143 ... labyrinth structure, 144 ... annular projection, 147 ... surface of gear case, 148 ... claw part, 151 ... breather passage, 152 ... breather hole, 155 ... Tube member, 155a...

Claims (3)

A motorcycle having a gear case containing oil on the side of the rear wheel, a breather passage communicating with the outside air inside the case, and the output of the power unit being transmitted to the rear wheel via the gear case In
The breather passage is constituted by a breather hole provided in an upper portion of the gear case, and a breather tube connected to the breather hole,
The rear face of the gear case facing the rear wheel is provided with an annular recess centered on the axle of the rear wheel, and the rear wheel hub is provided with an annular protrusion that fits into the annular recess to form a labyrinth structure.
A motorcycle, wherein the breather tube extends downward along the annular recess.   The motorcycle according to claim 1, wherein the annular recess is provided in a ring member attached to the gear case, and a claw portion for stopping the breather tube is integrally formed on the ring member. An oil injection hole is provided on the surface of the gear case, the breather hole is provided on the back surface of the gear case, a tube member is inserted into the breather hole from the back surface to the surface, and one end of the breather tube is inserted into the tube member. To connect,
2. The motorcycle according to claim 1, wherein when the oil is injected with the front side up and the back side down, the tip of the pipe member comes out above the injected oil.

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