JP2582275Y2 - Starter support device for motorcycle engine - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an engine and a transmission mechanism having a transmission case in which a case member is connected to a case portion connected to a crankcase of the engine via an endless gasket made of an elastic material. A power unit is swingably supported on a body frame of a motorcycle, and a starter attached to the engine includes a starter motor attached to the case portion, a support shaft that rotates in conjunction with the starter motor, and an engine. A pinion that is disengageable from a ring gear connected to the crankshaft and is supported on the support shaft so as to be movable in the axial direction.One end of the support shaft is rotatably supported on the case portion and is non-rotatably mounted on the case portion. The present invention relates to a starter support device for a motorcycle engine in which the other end of the support shaft is rotatably supported by a holder.

[0002]

2. Description of the Related Art Conventionally, such an apparatus is disclosed in
It is already known, for example, from Japanese Patent Application Laid-Open No. 9-196579.

[0003]

However, in the prior art described above, the holder is only mounted on the case portion of the transmission case in a non-rotatable manner, and a slight axial movement of the holder is allowed. The holder may vibrate in the axial direction according to the rotation of the shaft.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a starter support device for a motorcycle engine which prevents axial vibration of a holder without increasing the number of parts. Aim.

[0005]

According to the present invention, a case member is connected to an engine and a case portion connected to a crankcase of the engine via an endless gasket made of an elastic material. A power unit comprising a transmission mechanism having a transmission case is swingably supported on a body frame of a motorcycle, and a starter attached to the engine comprises: a starter motor attached to the case portion; A support shaft that rotates in conjunction with the motor; and a pinion that is rotatably supported by the support shaft so as to be disengageable from a ring gear connected to a crankshaft of the engine, and one end of the support shaft is rotatably supported by a case portion. A motorcycle engine in which the other end of the support shaft is rotatably supported by a holder that is non-rotatably mounted on the case. In other support device, the gasket, the elastic support portion to be sandwiched between the holder and the case member, characterized in that it is integrally connected to.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 7 show an embodiment of the present invention. FIG. 1 is a side view of a scooter type motorcycle, FIG. 2 is a plan view of FIG. FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a partially cutaway longitudinal sectional view taken along line 5-5 of FIG. 4, and FIG. 6 is a plan view of a gasket. 7 is a sectional view taken along line 7-7 in FIG.

Referring first to FIGS. 1 and 2, a body frame F of a scooter type motorcycle V has a head pipe 1 for supporting a front fork 7 on which a front wheel Wf is suspended so as to be steerable, and extends downward from the head pipe 1. And a rear frame 3 connected to the lower end of the down tube 2 and extending rearward. The rear frame 3 has a pair of front frame portions 3a, 3a whose front ends are connected to the lower end of the down tube 2 and extends substantially horizontally toward the rear side, and from the rear ends of both front frame portions 3a, 3a. A pair of intermediate frame portions 3b, 3b extending upward and rearward,
It has a rear frame portion 3c that connects the rear ends of the two intermediate frame portions 3b, 3b to each other, and is formed in a substantially elliptical shape in plan view.

The vehicle body frame F is covered by a vehicle body cover C. The vehicle body cover C covers the front part of the head pipe 1 and the upper part of the front wheel Wf.
1. A leg shield 12 joined to the front cover 11 to cover the front of the driver's leg, and a pair of left and right front side covers 13, 13 joined to the front cover 11 and the leg shield 12 to cover both sides of the front vehicle body. A floor board 14 joined to the leg shield 12 and supporting the driver's feet; a pair of left and right rear lower covers 16 joined to the front side covers 13 and 13 and the floor board 14 to cover both side surfaces of the rear body; , 16 and both rear lower covers 16, 16 and floor board 14
A rear fender 18 that covers an upper portion of the rear wheel Wr is attached to a rear portion of the rear upper cover 17. Rear upper cover 1
The upper surface of 7 is open, and the upper surface opening is covered with a seat 20 on which a driver sits. The seat 20 is hinged to the upper end of the rear upper cover 17 so as to be freely openable and closable, and the luggage box 21 having the upper end opened.
Is stored and arranged in the upper part of the rear upper cover 17, so that an article storage room 22 opened and closed by the seat 20 is formed below the seat 20.

Referring also to FIG. 3, a rear wheel Wr as a drive wheel is pivotally supported by a rear portion of a power unit P which is swingably supported by a vehicle body frame F. A two-cycle forced air-cooled engine E and a continuously variable transmission M for transmitting the output of the engine E to the rear wheels Wr.
It is composed of Thus, the front of the power unit P
The two intermediate frame portions 3b of the rear frame 3 of the vehicle body frame F are swingably supported via a link mechanism 24 having a support shaft 23 parallel to the rotation axis of the rear wheel Wr. Rear frame 3
A rear cushion 25 is interposed between them.

4 and 5, a cylinder head 26 of the two-cycle forced air-cooled engine E is disposed between the intermediate frames 3b, 3b of the rear frame 3, and has a substantially horizontal axis. , The front end of the cylinder block 27 is connected, and the rear end of the cylinder block 27 is connected to a crankcase 28. The piston 3 is provided in the cylinder bore 29 of the cylinder block 27.
The piston 30 is connected to a crankshaft 32 as an output shaft via a connecting rod 31.

A cooling fan 34 is connected to one end of a crankshaft 32 projecting from the crankcase 28 via a generator 33.
And a shroud 36 forming a scroll passage 35 around the cooling fan 34,
4. The cylinder head 26 and the cylinder block 27 are covered.

The shroud 36 is a first member 3 that covers the cylinder head 26 and the cylinder block 27 from the front side.
7 and a second member 38 that covers the remaining portion. Thus, the first member 37 is fastened to the cylinder head 26 by a plurality of mounting bolts 41 whose fastening direction is along the axis of the cylinder block 27. That is, a plurality of mounting bosses 42 are provided on the cylinder head 26 so as to project in parallel with the axis of the cylinder block 27.
The mounting bolts 41 penetrating the mounting rubber 44 interposed between the first members 37 are screwed into the mounting bosses 42.

In addition, a portion corresponding to a large number of fins 39 provided on the cylinder head 26, the inner surface of the first member 37 has a semicircular cross-section formed to face the tip of each fin 39. Grooves 40 are provided. An outer periphery of a plug seal 47 that is in close contact with an outer periphery of an ignition plug 45 screwed to the cylinder head 26 is engaged with the first member 37, and a cap 48 that covers an outer end of the ignition plug 45 is attached to the plug seal 47. Are detachably engaged.

By the way, as shown in FIGS. 1 and 3,
A maintenance lid 49 is attached to the floor board 14 of the vehicle body cover C so as to be openable and closable on a front extension line of the cylinder head 26.
A fuel tank 50 is fixedly arranged below the floor board 14 so that refueling can be performed when the valve 9 is opened.

The first member 37 and the second member 38 are engaged with each other so that they can be engaged and disengaged in accordance with the operation of moving the first member 37 along the axis of the cylinder head 26.

The second member 38 of the shroud 36 is provided with an annular partition wall 52 projecting inward, that is, toward the cooling fan 34 substantially corresponding to the rotation locus of the outermost edge of the cooling fan 34. A scroll passage 35 is formed between the second member 38 and the outer peripheral wall. Thus, the scroll passage 35 gradually increases its flow area along the rotation direction of the cooling fan 34, and the outer peripheral wall of the second member 38 at the portion corresponding to the partition wall 52 extends along the rotation direction. It is formed so as to gradually separate from the partition wall 52 as it proceeds downstream. In addition, at a portion corresponding to the scroll passage 35 of the second member 38, a swelling portion 38a swelling outward in the axial direction of the cooling fan 34 is provided.
Is formed so that the amount of swelling gradually increases toward the downstream side along the rotation direction.

The second member 38 is provided with a circular hole 55 facing the cooling fan 34 so as to be coaxial with the crankshaft 32. A large number of suction ports 56 communicating with the circular hole 55 are formed between the partition portions 57. Is attached to the second member 38, and the sound absorbing material 5 is provided between the second member 38 and the cover 58.
9 are filled. Thus, a number of holes are formed in a portion of the second member 38 corresponding to the sound absorbing material 59, and noise generated in the shroud 38 is absorbed by the sound absorbing material 59 through the holes.

Referring to FIG. 4 again, the crankcase 28 is integrally provided with a case 61 extending to one side of the rear wheel Wr, and is connected to the case 61 via a gasket 62. A transmission case 64 is constituted by the case member 63. Thus, as shown in FIG. 6, the gasket 62 is formed endlessly by an elastic material such as rubber.

A continuously variable transmission M is provided between the other end of the crankshaft 32 protruding from the crankcase 28 and the axle 65 of the rear wheel Wr rotatably supported at the rear of the transmission case 64. Since the step transmission M is conventionally known, its configuration will be briefly described.
2 is provided with a drive-side transmission pulley 68 comprising a fixed pulley half 66 fixed to the end of the crankshaft 32 and a movable pulley half 67 mounted on the crankshaft 32 so as to be slidable in the axial direction. Can be Fixed and movable pulley halves 66, 6
7, a V-shaped annular groove 69 is formed.
An endless V-belt 70 is inserted therein. On the back of the movable pulley half 67, a ramp plate 71 is fixed to the crankshaft 32. A plurality of weight rollers 7 are provided between the ramp plate 71 and the movable pulley half 67.
2 are accommodated in a floating state. When the rotation speed increases during rotation of the crankshaft 32, the weight roller 72 receiving the centrifugal force moves radially outward, and the movable pulley half 67
In the direction to approach the fixed pulley half 66,
Thereby, the contact radius of the V-belt 71 to both pulley halves 66 and 67 can be increased.

On the other hand, a driven shaft 73 parallel to the crankshaft 32
Is rotatably supported by a transmission case 64, and the driven shaft 73 is connected via a reduction gear train 74 to the axle 6 of the rear wheel Wr.
5 is connected.

The driven shaft 73 is connected to a driven transmission pulley 76 coaxial with the driven shaft 73 via a conventionally known centrifugal clutch 75. The driven transmission pulley 76 forms a pair with the drive transmission pulley 68, and the V belt 7
0 is wound around the drive-side transmission pulley 68.

Above the transmission case 64, a carburetor 80
And an air cleaner 81 connected to the carburetor 80. A cover 89 covering the outside of the carburetor 80 extends forward and is integrally connected to the air cleaner 81. On the other hand, in the first member 37 of the shroud 36,
At a position opposite to the suction port 56 with respect to the cylinder block 27, an exhaust port (not shown) for discharging the air that has flown through the shroud 36 and has been heated to the outside, and the carburetor 80. An exhaust port 90 for guiding exhaust air for heat retention is provided, and the exhaust port 90 has a rubber connection pipe 91.
Is connected, and one end of the air guide duct 92 is connected to the connection pipe 91.

The air guide duct 92 includes a pair of duct halves 9.
3 and 94 are joined to each other. The carburetor 80 is accommodated in a concave portion 95 provided in the case member 63 of the transmission case 64 and is substantially flush with the outer surface of the case member 63. Extending to the side. Moreover, the other end of the air guide duct 92 is fastened to the cover 89 by a screw member 96.

Referring also to FIG. 7, a starter 100 attached to the engine E includes a starter motor 101 mounted outside the case 61 of the transmission case 64.
And the output torque of the starter motor 101
Transmission mechanism 10 capable of transmitting to ring gear 103 at the start of
The ring gear 103 is provided on the outer periphery of a fixed pulley half 66 fixed to the crankshaft 32.

The transmission mechanism 102 has a conventionally well-known structure, and is supported by a support shaft 104 which rotates in conjunction with a starter motor 101 and is disengageable by a ring gear 103 so as to be axially movable by the support shaft 104. Pinion 10
5 and a projecting mechanism 106 provided on the support shaft 104 to control the axial movement of the pinion 105. A driven gear 108 constantly meshed with a driving gear 107 provided on an output shaft of the starter motor 101 is provided on the support shaft 104.
Is provided.

Incidentally, one end of the support shaft 104 is rotatably supported by the case portion 61 via a bearing 109. A holder 110 is fitted and mounted on the case portion 61 so as not to rotate. The other end of the support shaft 104 is rotatably supported by the holder 110 via a bearing 111. Moreover, an elastic support portion 112 sandwiched between the holder 110 and the case member 63 is integrally connected to the gasket 62.

Next, the operation of this embodiment will be described. During the operation of the engine E, the cooling fan 34 connected to the crankshaft 32 rotates and the air sucked from the inlet 56 is scrolled from the cooling fan 34. Passage 35
Through the cylinder head 26 and the cylinder block 27
It is discharged to the side. At this time, the fins 39 of the cylinder head 26 are connected to the first members 37 of the shroud 36.
, The flow resistance between the tip of each of the fins 39 and the first member 37 increases, so that the cooling air reliably flows between the fins 39. And the cooling efficiency is improved.

A part of the air heated by cooling the cylinder head 26 and the cylinder block 27 is discharged to the outside, and the remaining heated air is discharged to the exhaust port 90.
From the carburetor 80 through the connecting pipe 91 and the air guide duct 92.
It is discharged toward. Thereby, the vaporizer 80 is kept warm.

Further, the support shaft 10 of the starter 100
4 are rotatably supported by a case portion 61 and a holder 110 non-rotatably mounted on the case portion 61, and an elastic support portion 112 is sandwiched between the holder 110 and the case member 63. Axial vibration of the holder 110 due to the rotation of the holder 110 is effectively prevented.
Moreover, since the elastic support portion 112 is integrally provided with the gasket 62 sandwiched between the case portion 61 and the case member 63, the number of components does not increase.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various designs can be made without departing from the present invention described in the claims for utility model registration. Changes can be made.

[0032]

As described above, according to the present invention, the elastic support portion sandwiched between the holder and the case member is integrally formed on the gasket, so that the shaft of the holder is not increased without increasing the number of parts. Directional vibration can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a scooter type motorcycle.

FIG. 2 is a plan view as viewed in the direction of arrow 2 in FIG.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 3;

5 is a partially cutaway longitudinal sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a plan view of a gasket.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 5;

[Explanation of symbols]

 28 Crankcase 32 Crankshaft 61 Case part 62 Gasket 63 Case member 64 Transmission case 100 Starter 101 Starter motor 103 Ring gear 104 Support shaft 105 Pinion 110 Holder 112 Elastic support E Engine F Body frame M Stepless transmission P as transmission mechanism Power unit V motorcycle

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-350364 (JP, A) JP-A-5-71453 (JP, A) JP-A-61-193979 (JP, A) 196579 (JP, U) Japanese Utility Model Showa 60-47875 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02N 11/00 F02N 15/02 F02N 15/06 F02B 77/00 B62M 7/06

Claims (1)

(57) [Scope of request for utility model registration] An engine (E) and a case (61) connected to a crankcase (28) of the engine (E) are provided with a case member (63) via an endless gasket (62) made of an elastic material. A power unit (P) composed of a transmission mechanism (M) having a transmission case (64) coupled thereto is swingably supported on a vehicle body frame (F) of the motorcycle (V), and the engine (E) The starter (100) attached to the case (61) includes a starter motor (101) attached to the case (61), a support shaft (104) that rotates in conjunction with the starter motor (101), and a crank of the engine (E). Ring gear (1) connected to shaft (32)
A pinion (105) supported on the support shaft (104) so as to be disengageable at 03), and one end of the support shaft (104) is rotatably supported on the case (61); In a starter support device for a motorcycle engine in which the other end of the support shaft (104) is rotatably supported on a holder (110) non-rotatably mounted on a case (61), a gasket (62) includes: Holder (11
A starter support device for a motorcycle engine, wherein an elastic support portion (112) interposed between the first and second case members (0) and (63) is integrally connected.