JPH10184502A - Starter support structure of engine for motorbike - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the number of manhours and absorb axial vibration of a holder. SOLUTION: A power unit is composed of an engine, a transmitting case 41, and a cover member 46. A starter 13 arranged on the engine has a starter motor 61 mounted on the transmitting case 41, a support shaft 63 rotated interlockingly with the starter motor 61, and a pinion 65 which can be axially moved on the support shaft 63, meshed with a ring gear 11 arranged on a crank shaft 12 of the engine upon being moved for transmitting the rotation of the support shaft 63 to the ring gear 11. One end of the support shaft 63 is rotatably arranged on the transmitting case 41, while the other end is rotatably arranged on a holder 68 held by an inner wall of the cover member 46. An elastic member 69 is sandwiched between the holder 68 and the cover member 46. The elastic member 69 is fitted to the holder 68 or the cover member 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a starter support structure for a motorcycle engine.

[0002]

2. Description of the Related Art As a starter support structure for an engine, for example, Japanese Unexamined Utility Model Publication No. 7-42431 discloses a "starter support device for a motorcycle engine". The above technology is
This is a technique for providing a starter support device for a motorcycle engine that prevents axial vibration of a holder without increasing the number of parts.

[0006] As shown in FIGS. 6 and 7 of the above publication, the above-mentioned technique is to rotate a starter motor 101 attached to a case portion 61 of a transmission case 64 in conjunction with a rotation shaft of the starter motor 101, and Pinion 1 that can move and mesh with ring gear 103 provided on the crankshaft
05, a support shaft 104 rotatable integrally with the pinion 105, and a holder 11 attached to the case portion 61 for rotatably supporting an end of the support shaft 104.
0, a gasket 62 sandwiched between the case portion 61 and a case member 63 serving as a cover of the conductive case 64, and integrally formed with the gasket 62 and the holder 110
And an elastic support portion 112 sandwiched between the case member 63 and the case member 63.

[0004]

The above-mentioned elastic support portion 112
Is formed integrally with the gasket 62 and has flexibility and seals over a wide range. Therefore, it is necessary to position the gasket 62 and the elastic support 112 at the time of assembly. Improvement in assemblability is desired.

The gasket 62 and the elastic support 112
If a separate member is used, it is necessary to fix it to the holder 110 or the case member 63 with an adhesive or the like in order to prevent the displacement of the elastic support portion 112, and there is a disadvantage that the number of assembly steps increases. Further, the adhesive may deteriorate with time, and if it deteriorates, the adhesive must be applied to the elastic support portion 112 again. Therefore, an object of the present invention is to provide a starter support structure for a motorcycle engine that can be easily assembled and can absorb axial vibration of a holder.

[0006]

According to one aspect of the present invention, there is provided an engine, a transmission case connected to a crankcase of the engine, and a cover member covering the transmission case. A power unit, a starter attached to the engine, a starter motor attached to a transmission case, a support shaft rotating in conjunction with the starter motor, and an axially movable and movable on the support shaft. A pinion that meshes with a ring gear provided on the crankshaft of the engine and transmits the rotation of the support shaft to the ring gear, one end of the support shaft is rotatably mounted on the transmission case, and the other end of the support shaft is rotatably covered. It is attached to the holder held by the inner wall, and an elastic member is sandwiched between the holder and the cover member. It was fitted and held in the over member.

Since the elastic member does not need to be formed integrally with the gasket or the like, and a special fixing member for fixing the elastic member is not required, the assembling becomes easy and the number of assembling steps can be reduced. Further, there is no need to worry about deterioration of the adhesive with time, and it is possible to absorb the axial vibration of the holder.

According to a second aspect, the elastic member is held by the holder. Since the elastic member can be temporarily fixed to the holder only by fitting without using an adhesive, the number of assembling steps can be reduced. In addition, if the elastic member is held in the holder in advance, for example, in an assembly line of a power unit, the assembly of the holder and the elastic member is small, so that a small storage space is required, and furthermore, during the assembly flowing through the line. The above-mentioned assemblies can be assembled one after another to the power unit, and the assemblability can be improved.

According to a third aspect, the elastic member is held by the cover member. Since the elastic member can be temporarily fixed to the cover member only by fitting without using an adhesive, the number of assembly steps can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a side view showing a power unit of a motorcycle according to the present invention. A power unit 1 includes an engine 2 and a continuously variable transmission 3 that transmits power from the engine 2 to wheels. The engine 2 includes a starter 13 for rotating the crankshaft 12 via the ring gear 11 at the time of starting.

The transmission 3 includes a transmission case 41 formed integrally with the engine 2, a drive pulley 42 attached to one end of the crankshaft 12 projecting to the front (left side in the figure) of the transmission case 41. A driven shaft 43 provided at the rear of the power unit 1 in parallel with the crankshaft 12;
3, a V-belt 45 stretched over the drive pulley 42 and the driven pulley 44, and a cover member 46 that covers the side surface of the transmission case 41.
(See FIG. 2). Reference numeral 41a is a cover member mounting surface, and 47 is a vehicle body frame mounting portion for mounting on a vehicle body frame.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1. The engine 2 includes a crankcase 16 for rotatably supporting a crankshaft 12, a generator 17 provided at the other end of the crankshaft 12, A connecting rod 18 having one end connected to the shaft 12 via a crank pin 12a, a piston 22 connected to the other end of the connecting rod 18 via a piston pin 21, and a cylinder 23a into which the piston 22 is slidably inserted. Cylinder block 23, and a cylinder head 24 provided on the top of the cylinder block 23.
And a spark plug 25 attached to the cylinder head 24.
And Reference numerals 23b and 23b denote scavenging passages, 26 a reed valve, 27 an intake pipe, and 28 and 28 bearings.

The drive pulley 42 of the transmission 3 comprises a fixed pulley half 51 fixed to the end of the crankshaft 12 and a movable pulley half 52 mounted on the crankshaft 12 so as to be movable in the axial direction. 53 is a plate fixed to the crankshaft 12.

Numeral 54 denotes a plate 53 and a movable pulley half 52
When the rotation of the crankshaft 12 rises, it moves radially outward by centrifugal force, moves the movable pulley half 52 toward the fixed pulley half 51, and Increase the diameter of contact with both pulley halves 51, 52,
The speed ratio of the transmission 3 is steplessly increased, the vehicle speed is increased, and when the rotation of the crankshaft 12 is lowered, it moves inward to act in the opposite manner to lower the vehicle speed. Things. Here, 55 is a kick starter device, 5
6 is a drive wheel.

FIG. 3 is a sectional view taken along the line 3-3 in FIG. 1, and a starter motor 61 of the starter 13 is fixed to the transmission case 41 with bolts B1...
A gear 62 is engaged with a rotation shaft 61a of the starter motor 61, a support shaft 63 is formed integrally with the gear 62, and one end of the support shaft 63 is rotatably supported by a transmission case 41 via a bearing 64, A pinion 65 is movably attached to the center of the support shaft 63 by pinion moving means 66, a stopper 67 is attached to an end of the pinion 65, and the other end of the support shaft 63 is supported by a holder 68 via a bearing 64, Rubber 6 as an elastic member is provided at the end of the holder 68.
9 shows that the rubber 69 has been pressed and held by the cover member 46. The rubber 69 absorbs the vibration of the holder 68 generated when the pinion 65 moves, so that the vibration is not transmitted to the cover member 46 and the transmission case 41.

As described above, since the rubber 69 can be temporarily fixed to the holder 68 only by fitting without using an adhesive, the number of assembly steps can be reduced. If the rubber 69 is held in the holder 68 in advance, for example, the power unit 1
In the assembly line of FIG. 1 (see FIG. 1), the assembly of the holder 68 and the rubber 69 is small, so that the storage space is small. Further, the assemblies are assembled one after another with the power unit 1 during assembly flowing down the line. Can be attached, and assemblability can be improved.

FIG. 4 is a perspective view showing the holder and the rubber according to the present invention. The holder 68 has a sector hole 68a, a cylindrical portion 68b projecting from the sector hole 68a, and a transmission case 41 (see FIG. 3). ) To prevent the holder 68 from rotating around the support shaft 63 (see FIG. 3).
c, and a housing part 68d for supporting the support shaft 63 via the bearing 64 shown in FIG.
It is a state in which it is floated with respect to 1. FIG.
68e is an outer surface of the holder 68 having an arc shape in a sectional view,
Reference numeral 68f denotes an outer surface of the holder that is linear in a sectional view, and 68g denotes an inner surface of the sector hole.

The rubber 69 has a plate-like shape and the outer periphery is the circular arc portion 6.
A substantially fan-shaped base 69c composed of 9a and a straight portion 69b (see FIG. 5), a substantially fan-shaped upright portion 69d provided on one surface of the base 69c, and the same as the arc portions 69a to 69d of the base 69c. And a first claw portion 69e formed so as to protrude toward the upright portion 69d side, and formed so as to protrude from the linear portion 69b of the base portion 69c to the same side as the upright portion 69d, and to tilt down to the upright portion 69d side. And a second claw portion 69f.

The upright portion 69d of the rubber 69 has a holder 68
Of the fan-shaped hole 68a. First claw 69
e presses the outer surface 68e of the holder 68 from the radial outside, and the second
The claw portion 69f presses the outer surface 68f of the holder 68 from outside.

FIGS. 5A to 5C are explanatory views of the rubber according to the present invention, wherein FIG. 5A is a front view, and FIG.
FIG. 3C is a cross-sectional view taken along a line b, and FIG. 4C is a cross-sectional view taken along a line c-c in FIG. In (a), 69g is an inner arc formed near the center of the upright portion 69d, 69h is an outer arc formed outside the upright portion 69d, and 69j is a rubber 69 attached to the holder 68.
This is an air vent hole for letting out the air trapped between the holder 68 and the rubber 69 at the time of mounting.

In (b), since the second claw portion 69f has fallen toward the upright portion 69d, the rubber 69 is attached to the holder 68.
Is forcibly erected when attached, and the outer surface 68 f of the holder 68 is pressed inward by the elastic force of the rubber 69. 6
Reference numeral 9k denotes a thin portion formed on the base portion 69c, which is a portion which is not sandwiched between the holder 68 and the cover member 46 shown in FIG. A thick portion 69m is formed on the base 69c, and forms a step 69n with respect to the base 69c to perform positioning with the cover member 46.

In (c), since the first claw portion 69e has fallen toward the upright portion 69d, it is forcibly erected when mounted on the holder 68, and the outer surface 68e of the holder 68 is subjected to the elastic force of the rubber 69. To press inward. Therefore, the upright portion 69d, the first claw portion 69e, and the second claw portion 69f
Thereby, the rubber 69 can be fitted and held in the holder 68.

The operation of the rubber 69 described above will now be described. 6 (a) and 6 (b) are views for explaining the operation of the rubber according to the present invention.
(B) shows a state after the movement of the pinion. In (a), when the starter motor 61 (see FIG. 3) is not operating, that is, when the engine is stopped or the engine is running except when the engine is started, the pinion 65 does not move and does not engage with the ring gear 11.

In (b), when the engine is started, first, the pinion moving means 66 operates, and the pinion 65 moves and meshes with the ring gear 11. Next, the starter motor 61 operates, and the gear 62, the support shaft 63, the pinion 65
Then, the ring gear 11 rotates, the crankshaft 12 (see FIG. 3) rotates, and the engine 2 (see FIG. 2) starts.

When the pinion 65 moves, the pinion 6
The stopper 67 at the front end of the pin 5 contacts one end face of the holder 68, and regulates the movement of the pinion 65. At this time, the holder 68 vibrates when the stopper 67 hits,
This vibration can be absorbed by the rubber 69 fitted and held on the other end face of the holder 68, and the holder 68 itself,
It is possible to prevent the transmission case 41 and the cover member 46 from being deformed, damaged, and generated.

FIG. 7 is a cross-sectional view showing another embodiment of the method for mounting rubber according to the present invention, and shows that the rubber 71 is fitted and held on the cover member 46. As described above, the rubber 71 is covered with the cover member 46 only by fitting without using an adhesive.
Can be temporarily stopped, so that the number of assembly steps can be reduced.

In the embodiment of the present invention, the elastic member is the rubber 69. However, the elastic member is not limited to this and may be a soft resin. Further, although the thin portion 69k is formed in the rubber 69, the thin portion 69k may be removed to form a hole. Further, the rubber 69 is attached to the holder 68 or the cover member 46.
However, in addition to this, it may be bonded to the holder 68 or the cover member 46 using an adhesive.

[0028]

According to the present invention, the following effects are exhibited by the above configuration. A starter support structure for a motorcycle engine according to claim 1 is a power unit including an engine, a transmission case connected to a crankcase of the engine, and a cover member that covers the transmission case, and is attached to the engine. The starter includes a starter motor attached to the transmission case, a support shaft that rotates in conjunction with the starter motor, and a ring gear that is movable on the support shaft in the axial direction, and is provided on the crankshaft of the engine when moved. A pinion for transmitting the rotation of the support shaft to the ring gear, rotatably mounting one end of the support shaft to the transmission case, and rotatably mounting the other end of the support shaft to a holder held by the inner wall of the cover member. An elastic member is sandwiched between the holder and the cover member, and the elastic member is fitted and held in the holder or the cover member. Therefore, it is not necessary to form the elastic member integrally with the gasket or the like, and since a special fixing member for fixing the elastic member is not required, the assembling becomes easy and the number of assembling steps can be reduced. Further, there is no need to worry about the deterioration of the adhesive with time, and the vibration in the axial direction of the holder can be absorbed.

In the starter support structure for a motorcycle engine according to the second aspect, since the elastic member is held by the holder, the elastic member can be temporarily fixed to the holder only by fitting without using an adhesive. Can be suppressed. Further, if the elastic member is held in the holder in advance, for example, in an assembly line of the power unit, the assembly of the holder and the elastic member is small, so that the storage space is small, and furthermore,
The above-mentioned assembly can be assembled one after another to the power unit under assembly flowing down the line, and the assembling property can be improved.

According to the third aspect of the present invention, the elastic member is held by the cover member.
Since the elastic member can be temporarily fixed to the cover member only by fitting without using an adhesive, the number of assembly steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a power unit of a motorcycle according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a perspective view showing a holder and a rubber according to the present invention.

FIG. 5 is an explanatory view of a rubber according to the present invention.

FIG. 6 is a diagram illustrating the operation of the rubber according to the present invention.

FIG. 7 is a cross-sectional view showing another embodiment of the method for mounting a rubber according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power unit, 2 ... Engine, 11 ... Ring gear, 12 ... Crank shaft, 13 ... Starter, 16 ... Crank case, 41 ... Transmission case, 46 ... Cover member, 61
... Starter motor, 63 ... Support shaft, 65 ... Pinion, 6
8 Holder, 69 Elastic member (rubber).

Claims (3)

[Claims] 1. A power unit comprising an engine, a transmission case connected to a crankcase of the engine, and a cover member covering the transmission case, wherein a starter attached to the engine is attached to the transmission case. A starter motor, a support shaft that rotates in conjunction with the starter motor, and is axially movable on the support shaft, and meshes with a ring gear provided on a crankshaft of the engine when moved. A pinion for transmitting rotation to a ring gear, one end of the support shaft is rotatably mounted on the transmission case, and the other end of the support shaft is rotatably mounted on a holder held by the inner wall of the cover member. An elastic member is interposed between the cover member and the elastic member, and the elastic member is fitted and held in the holder or the cover member. Starter supporting structure for a motorcycle engine according to claim. 2. A starter support structure for a motorcycle engine according to claim 1, wherein said elastic member is held by said holder. 3. A starter support structure for a motorcycle engine according to claim 1, wherein said elastic member is held by said cover member.