JP2005069144A - Starter of engine for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate replacement work of parts composing a starter power transmission mechanism in a starter device of an engine for a motorcycle having a crank shaft having an axial line along a width direction of a vehicle body frame rotatably born by a crank case of an engine main body and having a starter motor attached on the crank case, and having a starter power transmission mechanism transmitting torque of the starter motor to the crank shaft provided between the starter motor and the crank shaft. <P>SOLUTION: A vertically extending housing tube part 78 is provided on an upper surface of the crank case 28. Torque transmission members 71, 72, 75, 77 constructing at lease a part of the starter power transmission mechanism 68 are housed in the housing tube part 78 in such a manner that the same can be detached from an upper end of an opening part of the housing tube part 78. Both end parts of a support shafts 79, 80 rotatably supporting the torque transmission members 71, 72, 75, 78 are supported by a side wall of the housing tube part 78 in such a manner that the same can be attached on and detached from an outside of the housing tube part. An upper end opening part of the housing tube part 78 is closed by a cover member . <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a starting device for a motorcycle engine, and in particular, a crankshaft having an axis along the width direction of a vehicle body frame is rotatably supported on a crankcase of an engine body mounted on the vehicle body frame. The present invention relates to a starting device for a motorcycle engine in which a motor is mounted and a starting power transmission mechanism for transmitting rotational power of the starting motor to the crankshaft is interposed between the starting motor and the crankshaft.

2. Description of the Related Art Conventionally, in a starter for a motorcycle engine disclosed in, for example, Patent Document 1, a starter motor is connected to a crankcase so that a rotating shaft passes through a side wall provided on the crankcase on one end side along the axis of the crankshaft. A starting power transmission mechanism is housed between a cover and a crankcase that are attached to the upper surface of the crankshaft and are attached to the crankcase so as to cover the starting clutch and the like at one end of the crankshaft.
JP 2001-115933 A

  However, in the above-described conventional one, when replacing the parts constituting the starting power transmission mechanism, it is necessary to install and remove the cover attached to the crankcase on one end side of the crankshaft. Since there are many fastening points, replacement work of parts constituting the starting power transmission mechanism becomes complicated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a starting device for a motorcycle engine that facilitates replacement work of components constituting a starting power transmission mechanism.

  In order to achieve the above object, according to a first aspect of the present invention, a crankshaft having an axis along the width direction of a vehicle body frame is rotatably supported on a crankcase of an engine body mounted on the vehicle body frame and started. A starting engine for a motorcycle engine, wherein a starting power transmission mechanism for transmitting rotational power of the starting motor to the crankshaft is interposed between the starting motor and the crankshaft; An upper and lower housing cylinder is provided on the upper surface of the crankcase, and a rotational power transmission member constituting at least a part of the starting power transmission mechanism can be inserted into and removed from the upper end opening of the housing cylinder. Both ends of the support shaft that is housed in the housing cylinder and rotatably supports the rotational power transmission member are attached from the outside of the housing cylinder. Is supported by the side walls of the housing cylinder portion as possible the operation, the upper end opening of the holding cylinder unit, characterized in that the closed openably by a lid member.

  In addition to the configuration of the invention described in claim 1, the invention described in claim 2 extends rearwardly downward from the head pipe that supports the head pipe pivotally supporting the front wheel and is close to each other in the rear part. The engine body is mounted on a vehicle body frame including a pair of left and right main frames that are bent in this manner so that the housing cylinder portion is disposed between the rear portions of the main frames, and at least the rear portion of the housing cylinder portion is The width along the width direction of the body frame is formed so as to become smaller toward the rear.

  Further, the invention according to claim 3 is a direction in which the starter motor having a rotation axis parallel to the axis of the crankshaft extends along the axis of the crankshaft in addition to the configuration of the invention according to claim 1 or 2. It is arranged at a substantially central portion of the engine main body.

  According to the first aspect of the present invention, the rotational power transmission member constituting at least a part of the starting power transmission mechanism is inserted into and removed from the upper end opening of the housing cylinder provided on the upper surface of the crankcase. Since both ends of the support shaft that is housed as possible and that supports the rotational power transmission member are supported on the side wall of the housing cylinder portion so as to be attachable / detachable from the outside of the housing tube portion, replacement of the rotational power transmission member Sometimes it is sufficient to open the lid member that closes the upper end opening of the housing cylinder so that it can be opened and closed, and to perform the insertion / removal operation of the rotational power transmission member and the attachment / detachment operation of the support shaft. Can be made easy.

  According to the second aspect of the present invention, it is possible to avoid the interference between the main frame included in the body frame and the housing cylinder portion in the engine body, and to set the width of the body frame as small as possible.

  According to a third aspect of the present invention, the engine in the direction along the axis of the crankshaft is arranged by disposing the heavy starting motor at the substantially central portion of the engine body in the direction along the axis of the crankshaft. It can contribute to the weight balance improvement of the main body.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 6 show an embodiment of the present invention, FIG. 1 is a right side view of a motorcycle, FIG. 2 is a plan view of an engine body and a main frame with a cylinder head omitted, and FIG. 2 is a longitudinal side view of the engine body viewed from the direction of arrow 3 in FIG. 2, FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, FIG. 5 is an enlarged view of the main part of FIG. It is an expanded sectional view showing composition.

  In FIG. 1, a motorcycle body frame F includes a head pipe 12 that supports a front fork 11 that pivotally supports a front wheel WF, and a pair of left and right main frames 13 that extend rearward and downward from the head pipe 12. ..., a pair of left and right engine hangers 14 welded to the front part of the head pipe 12 and both main frames 13 ... and extending downward from the main frame 13 ..., and a pair of left and right pivots extending downward from the rear part of the main frame 13 ... Plate 15 and a pair of left and right seat rails 16 extending rearward and connected to the rear portions of the main frames 13.

  Referring also to FIG. 2, the head pipe 12 integrally includes a cylindrical portion 12 a on which the front fork 11 is supported so as to be steerable and a pair of left and right gussets 12 b and 12 b extending downward from the cylindrical portion 12 a. The main frame 13 includes the gusset 12b, a pipe member 17 whose front end is welded to the gusset 12b, and a pivot plate 15 which is integrally provided with the rear end of the pipe member 17. And a pipe portion 15a.

  The pair of left and right main frames 13, 13 extend rearward and downward from the head pipe 12 in a side view, but in plan view, the head pipe 12 and the middle part in the front-rear direction are separated from each other as they go rearward. The middle from the front-rear direction to the pivot plate 15 is bent so as to be closer to each other as it goes rearward.

  In addition, a first cross pipe 18 is installed between the front parts of the main frames 13, 13, and a second cross pipe 19 is installed between the upper parts of the two pivot plates 15. A third cross pipe 20 is installed between them.

  An engine body 25 of a multi-cylinder engine E, for example, a four-cylinder engine E is supported at the lower part of the engine hangers 14 and the upper and lower parts of the pivot plates 15.

  3 and 4 together, the engine body 25 includes a cylinder block 27 having a plurality of, for example, four cylinder bores 26 arranged in the width direction of the vehicle body frame F, and a crank coupled to the cylinder block 27 at a lower portion. A case 28, a cylinder head 29 coupled to the upper part of the cylinder block 27, and a head cover 30 coupled to the upper part of the cylinder head 29 are provided, and the cylinder axis of each of the cylinder bores 26 is slightly forward. It is mounted on the vehicle body frame F in an inclined posture, and an oil pan 31 is coupled to the lower portion of the crankcase 28.

  The pistons 32 slidably fitted to the cylinder bores 26 have crankshafts that are rotatably supported by the crankcase 28 having an axis along the direction in which the cylinder bores 26 are arranged, that is, the width direction of the vehicle body frame F. 34 are connected via connecting rods 33.

  By the way, the crankcase 28 is joined so that an upper case half 27a and a lower case half 34 integrally formed at the lower portion of the cylinder block 27 can be divided vertically by a split surface 36 including the axis of the crankshaft 34. It is made up of. The crankcase 28 is formed with an overhanging portion 28a projecting rearward from the cylinder block 27, and the transmission chamber formed in the overhanging portion 28a has an axis parallel to the crankshaft 34. A transmission having a main shaft 37 and a counter shaft 38 is accommodated, and power from the counter shaft 38 of the transmission is transmitted to the rear wheel WR via the chain transmission means 40.

  The chain transmission means 40 includes a drive sprocket 41 fixed to the counter shaft 38, a driven sprocket 42 fixed to the rear wheel WR, and an endless chain 43 wound around the sprockets 41, 42. The motorcycle E is disposed on the left side of the engine E in a state of facing forward in the traveling direction of the motorcycle.

  A front end portion of a swing arm 44 that pivotally supports the rear wheel WR on the rear end portion is supported at a vertically middle portion between the pivot plates 15 and 15 so as to be swingable via a shaft 45. , 15 is provided with a link mechanism 46 between the third cross pipe 20 connecting the lower portions of the first and second members 15 and the swing arm 44. Further, the lower end portion of the rear cushion unit 47 whose upper end portion is connected to a bracket 44 a provided at the front portion of the swing arm 44 is connected to the front portion of the link 48 constituting a part of the link mechanism 46.

  An air cleaner 49 for purifying air supplied to the engine E is disposed above the engine body 25 so as to be positioned behind the head pipe 12 in the vehicle body frame F. A fuel tank 50 to be covered is mounted on both the main frames 13 in the vehicle body frame F, and a radiator 51 is disposed in front of the engine body 25.

  A main seat 52 for seating a rider is supported on the seat rail 16 at the rear of the fuel tank 50, and a pillion seat 53 for carrying a passenger is located at a position away from the main seat 52 in the rear. Supported by ...

  The exhaust system 54 connected to the cylinder head 29 of the engine main body 25 extends from the front of the engine main body 25 to the lower side of the engine main body 25, and further between the rear wheel WR and the engine main body 25 from the lower side of the engine main body 25 to the right side of the vehicle body. The vehicle stands up while curving toward the rear and extends rearward above the rear wheel WR.

  The front of the head pipe 12 is covered with a front cowl 55 made of synthetic resin, and both sides of the front part of the vehicle body are covered with a synthetic resin center cowl 56 connected to the front cowl 55 to cover the engine body 25 from both sides. A resin lower cowl 57 is connected to the center cowl 56. The rear portion of the seat rail 16 is covered with a rear cowl 58.

  A front fender 59 that covers the upper part of the front wheel WF is attached to the front fork 11, and a rear fender 60 that covers the upper part of the rear wheel WR is attached to the seat rails 16.

  Referring to FIGS. 5 and 6 together, a shift switching clutch 61 for switching power connection / disconnection between the crankshaft 16 and the main shaft 37 is attached to one end of the main shaft 37. The input member 62 included in the clutch 61 is supported on the main shaft 37 so as to be relatively rotatable.

  A power transmission gear train 63 is provided between the input member 62 of the shift switching clutch 61 and the crankshaft 34. The power transmission gear train 63 includes a gear 64 fixed to the crankshaft 34 and the gear. And a clutch gear 65 meshing with the clutch 64. The clutch gear 65 is connected to the input member 62 through a damper 66 and rotates together with the input member 62.

  A starter motor 67 having a rotation axis parallel to the crankshaft 34 is attached to the upper surface of the overhanging portion 28a of the crankcase 28, and the starter motor is interposed between the starter motor 67 and the crankshaft 34. A starting power transmission mechanism 68 for transmitting the rotational power 67 to the crankshaft 34 is provided.

  The starting power transmission mechanism 68 includes a driving gear 70 engraved on the output shaft 69 of the starting motor 67, a first idler gear 71 serving as a rotational power transmission member meshing with the driving gear 70, and a first idler gear. A second idler gear 72 as a rotational power transmission member that rotates integrally with 71, the gear 64 fixed to the crankshaft 34, and a clutch connected to the input member 62 of the shift switching clutch 61 via a damper 66. A gear 65 and a one-way clutch 73 interposed between the second idler gear 72 and the clutch gear 65 are configured.

  The one-way clutch 73 includes a clutch inner 75 as a rotational power transmission member that is integrally provided with a gear 74 that meshes with the second idler gear 72 and a rotational power transmission member that is integrally provided with a gear 76 that meshes with the clutch gear 65. The clutch outer 77 is configured to allow power transmission from the starter motor 67 side to the crankshaft 34 side.

  By the way, a housing cylinder portion 78 extending vertically is integrally provided on the upper surface of the overhang portion 28 a of the crankcase 28, and first and second idler gears constituting at least a part of the starting power transmission mechanism 68. 71 and 72 and the clutch inner 75 and the clutch outer 77 of the one-way clutch 73 are accommodated in the accommodating cylinder part 78 so as to be insertable / removable from the upper end opening of the accommodating cylinder part 78.

  In addition, the first support shaft 79 that rotatably supports the first and second idler gears 71 and 72, and the second support shaft 80 that rotatably supports the clutch inner 75 and the clutch outer 77 of the one-way clutch 73, The both ends of the support shafts 79 and 80 are detachably mounted on the storage cylinder portion 78 from the outside so as to be supported by the side walls of the storage cylinder portion 78.

  In order to support the first support shaft 79, in this embodiment, a bottomed support hole 81 for fitting and supporting one end portion of the first support shaft 79 and the other end portion of the first support shaft 79 are fitted. A support hole 82 penetrating the side wall so as to be supported is provided coaxially on the side wall of the housing cylinder portion 78, and one end of the second support shaft 80 is used to support both ends of the second support shaft 80. A support hole 83 having a bottom for fitting and supporting the portion and a support hole 84 penetrating the side wall so as to fit and support the other end portion of the second support shaft 80 are formed on the side wall of the housing cylinder portion 78. It is provided coaxially.

  In addition, a retaining ring 85 that engages with the other end portion of the first support shaft 79 is fitted into the inner surface of the support hole 81, and the holding portion that holds the protruding portion from the accommodation tube portion 78 at the other end portion of the second support shaft 80. A member (not shown) is detachably fastened to the accommodating cylinder portion 78. That is, the first and second support shafts 79 and 80 are attached to the housing cylinder portion 78 so as to be attachable / detachable from the outside.

  The starter motor 67 is disposed at a substantially central portion of the engine body 25 in the direction along the axis of the crankshaft 34, and the one-way clutch 73 and the starter motor 67 in a side view from the direction along the axis of the crankshaft 34. From the first and second idler gears 71 and 72 that transmit the power from the one-way clutch 73 so that the output shaft 69 penetrates the side wall of the housing cylinder portion 78, It is attached to the upper surface of 28a.

  Further, on the projection view on the plane orthogonal to the axis of the crankshaft 34, the axis of the starting motor 67, that is, the axis of the output shaft 69, is the upper and lower case halves 27a, 35 that constitute the crankcase 28 mutually. Is arranged on a straight line L that passes through the axis of the main shaft 37 and is orthogonal to the split surface. In addition, the axis of the starting motor 67 and the axes of the main shaft 37 and the counter shaft 38 of the transmission are arranged on the same straight line L in a side view from the direction along the axis of the crankshaft 34.

  By the way, the engine body 25 is mounted on the vehicle body frame F so that the housing cylinder portion 78 is disposed between the rear portions of the pair of left and right main frames 13 and 13, and the rear portions of the main frames 13 and 13 are rearward. Corresponding to bending toward each other, at least the rear part of the housing cylinder part 78 is formed so that the width along the width direction of the body frame F becomes smaller as it goes rearward. Yes. In addition, a lid member 86 that closes the upper end opening of the accommodation cylinder portion 78 is detachably attached to the upper end of the accommodation cylinder portion 78.

  Next, the operation of this embodiment will be described. On the upper surface of the overhanging portion 28a that protrudes rearward of the cylinder block 27 in the crankcase 28, a housing cylinder portion 78 that extends vertically is provided. The first and second idler gears 71 and 72 that constitute at least a part of the starting power transmission mechanism 68 interposed between the crankshafts 34, the clutch inner 75 and the clutch outer 77 of the one-way clutch 73, and the accommodating cylinder portion 78. It is accommodated in the accommodation cylinder part 78 so that insertion / removal from the upper-end opening part is possible. Also, a first support shaft 79 that rotatably supports the first and second idler gears 71 and 72, and a second support shaft 80 that rotatably supports the clutch inner 75 and the clutch outer 77 of the one-way clutch 73, are provided. The both ends of the support shafts 79 and 80 are attached to the housing cylinder portion 78 so as to be attachable / detachable from the outside so as to be supported by the side walls of the housing cylinder portion 78.

  Therefore, when the one-way clutch 73 and the first and second idler gears 71 and 72 are replaced, the lid member 86 that opens and closes the upper end opening of the housing cylinder portion 78 is opened, and the one-way clutch 73, the first and second idler gears are opened. It is only necessary to perform the insertion / removal operation of 71, 72 and the attachment / detachment operation of the first and second support shafts 79, 80, thereby facilitating replacement work of components constituting the starting power transmission mechanism 68.

  The engine main body 25 extends rearward and downward from the head pipe 12 and has a pair of left and right main frames 13 and 13 that are bent so as to be close to each other at the rear. 13 is mounted so as to be disposed between the rear portions, and at least the rear portion of the accommodating cylinder portion 78 is formed so that the width along the width direction of the vehicle body frame F becomes smaller toward the rear. And the interference of the accommodation cylinder part 78 in the engine main body 25 can be avoided, and the width of the vehicle body frame F can be set as small as possible.

  In addition, the starter motor 67 having a rotation axis parallel to the axis of the crankshaft 34 is disposed at a substantially central portion of the engine body 25 in a direction along the axis of the crankshaft 34. Is disposed substantially at the center of the engine body 25 in the direction along the axis of the crankshaft 34, thereby contributing to an improvement in the weight balance of the engine body 25 in the direction along the axis of the crankshaft 34.

  In addition, when viewed from the side along the direction of the axis of the crankshaft 34, the axis of the starting motor 67 transmits the power from the one-way clutch 73 and the starting motor 67 to the one-way clutch 73, and the first and second idler gears 71 and 72. Therefore, the center of gravity of the engine E can be lowered by disposing the heavy starting motor 67 at a position as low as possible.

  Further, on the projection view on the plane orthogonal to the axis of the crankshaft 34, the axis of the starting motor 67 is orthogonal to the split surfaces 36 of the upper and lower case halves 27a, 35 constituting the crankcase 28, and the crankcase 28 is arranged on a straight line L passing through the main shaft 37 of the transmission housed in the engine 28, the engine E can be reduced in size by bringing the starting motor 67 closer to the cylinder axis.

  Further, in a side view from the direction along the axis of the crankshaft 34, the axis of the starter motor 67 and the axes of the main shaft 37 and the countershaft 38 of the transmission are arranged on the same straight line L. It is possible to concentrate the mass and contribute to the improvement of the motor performance of the motorcycle.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

1 is a right side view of a motorcycle. FIG. 3 is a plan view of the engine main body and the main frame with the cylinder head omitted. FIG. 3 is a longitudinal side view of the engine body viewed from the direction of arrow 3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a principal part enlarged view of FIG. It is an expanded sectional view showing composition of a power transmission mechanism for starting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Front fork 12 ... Head pipe 13 ... Main frame 25 ... Engine main body 28 ... Crank case 34 ... Crankshaft 67 ... Starting motor 68 ... Starting power Transmission mechanism 71: a first idler gear 72 as a rotational power transmission member ... a second idler gear 75 as a rotational power transmission member ... a clutch inner 77 as a rotational power transmission member ... a rotational power transmission member Clutch outer 78 as a housing cylinder portion 79, 80 ... spindle 86 ... lid member F ... body frame WF ... front wheel

Claims (3)

  A crankshaft (34) having an axis along the width direction of the vehicle body frame (F) is rotatably supported on the crankcase (28) of the engine body (25) mounted on the vehicle body frame (F) and is used for starting. A motor (67) is attached, and a starting power transmission mechanism for transmitting the rotational power of the starting motor (67) to the crankshaft (34) between the starting motor (67) and the crankshaft (34). In the starting device for a motorcycle engine provided with (68), an upper and lower housing cylinder (78) is provided on the upper surface of the crankcase (28), and at least the starting power transmission mechanism (68) is provided. The rotational power transmission member (71, 72, 75, 77) constituting a part can be inserted into and removed from the upper end opening of the storage cylinder (78). 8) The both ends of the support shafts (79, 80) accommodated in the rotary power transmission member (71, 72, 75, 77) in a rotatable manner are located from the outside of the accommodating cylinder (78). A motorcycle engine characterized in that it can be attached and detached and is supported by a side wall of a housing cylinder (78), and an upper end opening of the housing cylinder (78) is closed by a lid member (86) so as to be opened and closed. Starter.   A pair of left and right main frames (13), which extend rearward and downward from a head pipe (12) that supports a front fork (11) that pivotally supports a front wheel (WF) and are bent close to each other at the rear, The engine body (25) is mounted on a body frame (F) provided so that the accommodating cylinder part (78) is disposed between rear portions of the main frames (13), and the accommodating cylinder part (78) 2. The starting device for a motorcycle engine according to claim 1, wherein at least a rear portion of the vehicle body is formed such that a width along the width direction of the vehicle body frame (F) decreases toward the rear.   The starter motor (67) having a rotational axis parallel to the axis of the crankshaft (34) is disposed at a substantially central portion of the engine body (25) in a direction along the axis of the crankshaft (34). The starting device for an engine for a motorcycle according to claim 1 or 2.