JPH07187049A - Carburetor heat insulation device for motorcycle - Google Patents

Abstract

PURPOSE:To enhance the durability of a carburetor against an external environment factor, and enable to keep warming thereof with exhaust heat by fitting a cover section to an air cleaner for concealing the carburetor and jointing the cover section to an air introduction duct. CONSTITUTION:The air from a scroll passage cools a cylinder head 26 and a cylinder block 27, thereby being raised in temperature. Then, a part of the heated air is discharged outside, and the remaining heated air is discharged from an exhaust opening 90 toward a carburetor 80 via an air introduction duct 92. As a result, the heat insulation of the carburetor 80 is maintained. In addition, an air cleaner 81 is fitted with a cover section 89 as integral part thereof for concealing the external side of the carburetor 80, and the duct 92 is jointed to the cover section 89. Thus, the duct 92 and the cover section 89 of the air cleaner 81 cooperate to act as a protector against an external environment factor such as rain drops, splashed water and the travel-generated wind. Consequently, the durability of the carburetor 80 against the external environment factor is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided above a case of a transmission mechanism provided between a crankshaft and a rear wheel of an engine.
A motorcycle in which a carburetor connected to an intake port of an engine and an air cleaner connected to the carburetor are arranged, and a shroud covers a cylinder block of an engine, a cylinder head, and a cooling fan connected to a shaft end of a crankshaft. Relates to a carburetor heat retaining device for keeping a carburetor warm by exhaust heat from an engine.

[0002]

2. Description of the Related Art Conventionally, such a motorcycle has been disclosed, for example, in Japanese Utility Model Publication No. 2-124250 and Japanese Utility Model Publication No. 3726.
It is already known from the publication No. 0, etc.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
The shroud exhaust port is opened toward the carburetor, and the shroud is provided with a guide plate that guides the exhaust air from the exhaust port to the carburetor. It is possible to do so, but no consideration has been given to the influence of external environmental factors such as rainfall, splashes and running wind. Moreover, since the carburetor must be placed close to the shroud, the carburetor placement is restricted.

The present invention has been made in view of the above circumstances, and it is possible to improve the durability against external environmental factors so that the carburetor can be kept warm by the exhaust air heat and the degree of freedom in arranging the carburetor is increased. An object of the present invention is to provide a carburetor heat retaining device for a motorcycle.

[0005]

In order to achieve the above object, the present invention provides a carburetor connected to an intake port of an engine above a case of a transmission mechanism provided between a crankshaft and a rear wheel of the engine. A motorcycle in which an air cleaner connected to the carburetor is arranged, and a cooling fan connected to an engine cylinder block, a cylinder head, and a shaft end of a crankshaft is covered with a shroud,
The shroud is provided with an intake port facing the cooling fan and an exhaust port arranged on the opposite side of the cylinder with respect to the intake port, and the air cleaner is integrally provided with a cover part covering the outside of the carburetor. It is characterized in that the other end of the air guide duct that is continuously provided and one end of which communicates with the exhaust port is extended toward the carburetor and is connected to the cover portion of the air cleaner.

[0006]

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

1 to 14 show an embodiment of the present invention. FIG. 1 is a side view of a scooter type motorcycle,
2 is a plan view taken along arrow 2 of FIG. 1, FIG. 3 is an enlarged view of a main part of FIG.
4 is an enlarged sectional view taken along line 4-4 of FIG. 3, and FIG. 5 is a sectional view taken along line 5-5 of FIG.
6 is an enlarged sectional view taken along line 6-6 of FIG. 5, FIG. 7 is a view taken along the line 7-7 of FIG. 4, and FIG. 8 is taken at 8-8 of FIG. 7. 7 is a sectional view taken along line 9-9 of FIG. 7, FIG. 10 is a sectional view taken along line 10-10 of FIG. 7, and FIG.
11 is a sectional view taken along line 11-11, FIG. 12 is an enlarged sectional view taken along line 12-12 of FIG. 3, FIG. 13 is an enlarged sectional view taken along line 13-13 of FIG. 4, and FIG. 14 is an enlarged sectional view showing an input shaft of an oil pump. It is a figure.

1 and 2, a body frame F of a scooter type motorcycle V has a head pipe 1 rotatably supporting a front fork 7 on which a front wheel Wf is suspended, and extends downward from the head pipe 1. The down tube 2 and the rear frame 3 which is continuously provided at the lower end of the down tube 2 and extends rearward. The rear frame 3 includes a pair of front frame portions 3a, 3a whose front end portion is connected to the lower end of the down tube 2 and extends substantially horizontally toward the rear side, and a rear end portion 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 both the intermediate frame portions 3b and 3b to each other, and is formed into a substantially elliptical shape in a plan view.

The vehicle body frame F is covered with a vehicle body cover C, and the vehicle body cover C covers the front portion of the head pipe 1 and the upper portions of the front wheels Wf.
1, a pair of left and right front side covers 13 and 13 joined to the front cover 11 to cover the front of the driver's leg, and a pair of left and right joined to the front cover 11 and the leg shield 12 to cover both sides of the front vehicle body. , A pair of left and right rear lower covers 16 joined to the leg shield 12 to support the feet of the driver, both front side covers 13 and 13, and joined to the floorboard 14 to cover both sides of the rear vehicle body. , 16 and both rear lower covers 16, 16 and floor board 14
A rear fender 18 that covers the upper portion of the rear wheel Wr is attached to the rear portion of the rear upper cover 17 and the like. Rear upper cover 1
The upper surface of 7 is open, and the upper opening is covered with a seat 20 on which the driver sits. The seat 20 is hinged to the upper end of the rear upper cover 17 so as to be openable and closable, and the luggage box 21 with the upper end opened.
By storing and arranging in the upper portion of the rear upper cover 17, an article storage chamber 22 capable of storing a helmet or the like is formed below the seat 20, and the article storage chamber 22 is opened and closed by the seat 20. It will be.

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

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

At one end of the crankshaft 32 protruding from the crankcase 28, a cooling fan 34 is provided via a generator 33.
Are connected to the cooling fan 34 by a shroud 36 that forms a scroll passage 35 around the cooling fan 34.
4, the cylinder head 26 and the cylinder block 27 are covered.

Referring also to FIG. 6, shroud 36
Is formed by joining at least a first member 37 as a head corresponding member that covers the cylinder head 26 (in this embodiment, the cylinder head 26 and the cylinder block 27) from the front side, and a second member 38 that covers the remaining portion. It is a thing. Thus, the first member 37 is provided with the rubber 40 between the tips of the many fins 39 provided on the cylinder head 26.
Cylinder block 2 with the tightening direction
7 are fastened to the cylinder head 26 by a plurality of mounting bolts 41 ... That is, the cylinder head 26 is provided with a plurality of mounting bosses 42 that abut against the inner surface of the rubber 40 in parallel with the axis of the cylinder block 27.
Each of the mounting bosses 42 ...
The insertion holes 43 ... Are provided in correspondence with. Thus, the mounting bolts 41, which are inserted into the insertion holes 43 with one end brought into contact with the mounting boss 42 and the other end of which penetrates the cylindrical mount rubber 44 engaged with the outer surface of the first member 37, The mounting bosses 42 are screwed together.

The first member 37 is provided with a hole 46 into which the spark plug 45 screwed into the cylinder head 26 is inserted, and the hole 46 has a plug seal which is in close contact with the outer periphery of the spark plug 45. The outer circumference of 47 is engaged. A cap 48 for covering the outer end of the ignition plug 45 is detachably attached to the plug seal 47 and elastically engaged therewith.

By the way, as shown in FIGS. 1 and 3,
A maintenance lid 49 is openably and closably attached to the floor board 14 of the vehicle body cover C on the extension line of the cylinder head 26.
A fuel tank 50 is fixedly arranged below the floorboard 14 to enable refueling 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 a moving operation of the first member 37 along the axis of the cylinder block 27.

Referring also to FIG. 7, the second member 38 of the shroud 36 has an annular shape that protrudes toward the inner side, that is, the cooling fan 34 side, substantially corresponding to the rotation locus 51 of the outermost edge of the cooling fan 34. The partition wall 52 is provided so as to project, and the scroll passage 35 is formed between the partition wall 52 and the outer peripheral wall of the second member 38. Thus, the scroll passage 35 is provided with the cooling fan 3
4 gradually increases the flow area along the rotation direction 53, and the outer peripheral wall of the second member 38 at the portion corresponding to the partition wall 52 gradually increases from the partition wall 52 toward the downstream side along the rotation direction 53. It is formed so as to separate from each other. Moreover, in the portion of the second member 38 corresponding to the scroll passage 35, the bulging portion 38 bulging outward in the axial direction of the cooling fan 34.
a is provided, and the bulging portion 38a has a rotational direction 53
The bulge amount is formed so as to gradually increase toward the downstream side along. That is, in the scroll passage 35, the bulging portion 3 at the upstream first position P ₁ along the rotation direction 53.
8a has a bulging amount L ₁ as shown in FIG. 8, at a second position P ₂ downstream of the first position P _{1 as} compared with the bulging amount L _{1 as} shown in FIG. bulging portion 38a is formed with a large bulge amount L _2, the third position P ₃ on the downstream side of the second position P _2, a large swelling amount than the bulge amount L ₂ as shown in Figure 10 bulging portion 38a is formed in the L _3, the further third position P ₃ fourth position P ₄ on the downstream side of FIG. 1
1, the bulge amount L ₄ larger than the bulge amount L ₃
Thus, the bulge portion 38a is formed.

A circular hole 55 facing the cooling fan 34 is provided in the second member 38 so as to be coaxial with the crankshaft 32. A large number of suction ports 56 ... The cover 58 attached to the second member 38 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 is filled. A large number of holes 60 ... Are bored in the portion of the second member 38 corresponding to the sound absorbing material 59, and the noise generated in the shroud 38 is absorbed by the sound absorbing material 59 through the holes 60. To be done.

Referring again to FIG. 4, the crankcase 28 is integrally provided with a case portion 61 extending to one side of the rear wheel Wr.
The transmission case 6 together with the case member 63 coupled via
4 are configured. Thus, the continuously variable transmission M is provided between the other end of the crank shaft 32 protruding from the crank case 28 and the axle 65 of the rear wheel Wr rotatably supported on the rear portion of the transmission case 64.

Since the continuously variable transmission M is well known in the prior art, its structure will be briefly described. The crankshaft 32 has a fixed pulley half body 66 fixed to the end of the crankshaft 32. A drive side transmission pulley 68 including a movable pulley half 67 that is mounted on the crankshaft 32 so as to be slidable in the axial direction is provided. Fixed and movable pulley halves 6
A V-shaped annular groove 69 is formed between 6 and 67, and an endless V-belt 70 is inserted into the annular groove 69. A ramp plate 71 is fixed to the crankshaft 32 on the rear surface of the movable pulley half 67.
A plurality of weight rollers 72 are accommodated between 1 and the movable pulley half 67 in a floating state. Then crankshaft 3
When the number of rotations increases during the rotation of 2, the weight roller 72, which receives the centrifugal force, moves radially outward to move the movable pulley half 67 toward the fixed pulley half 66, thereby causing both pulley half to move. The radius of contact of the V-belt 71 with the bodies 66 and 67 can be increased.

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

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

Referring also to FIG. 12, a transmission case 64
A vaporizer 80 and an air cleaner 81 connected to the vaporizer 80 are disposed above the. Air cleaner 81
The filter member 84 is sandwiched between the first case member 82 and the second case member 83 coupled to the second case member 82, and the filter member 84 is sandwiched between the first case member 82 and the filter member 84. An unpurified chamber 85 and a purified chamber 86 are formed between the second case member 84 and the filter medium 84. A suction pipe 87, which communicates with the unpurified chamber 85 and opens downward, is connected to the first case member 82, and the carburetor 8 is connected to the second case member 83.
A connecting pipe 88 connected to 0 is integrally provided.

The first case member 82 of the air cleaner 81 has a cover portion 89 that covers the outside of the carburetor 80.
Are extended continuously to the front side and are integrally provided in the cover portion 89. Work holes 90 for adjusting the carburetor 80 are provided corresponding to the carburetor 80 in the cover portion 89.

On the other hand, in the first member 37 of the shroud 36, at a position on the opposite side of the intake port 56 with respect to the cylinder block 27, the air flowing through the shroud 36 and heated is discharged to the outside. Exhaust port (not shown)
And an exhaust port 90 for guiding exhaust air for heat retention to the carburetor 80, a rubber connecting pipe 91 is connected to the exhaust port 90, and the connecting duct 91 is connected to an air guide duct. One end of 92 is connected.

The air duct 92 is a pair of duct halves 9
3, 94 are joined to each other. The carburetor 80 is housed in the recess 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. Extended to the side. Moreover, the other end of the air guide duct 92 is fastened to the cover 89 by the screw member 96. In addition, at the other end of the air duct 92,
A cover portion 93 a that covers the front upper side of the carburetor 80 is provided integrally with the duct half body 93. Moreover, the air duct 9
The 2 is also provided with an engaging portion (not shown) for engaging the piping related to the carburetor 80.

As shown in FIG. 5, an intake port 98 in which a reed valve 97 is arranged is provided in the upper part of the crankcase 28, and the carburetor 80 communicates with the intake port 98 via an intake pipe 99. To be done. Moreover, the crankshaft 32
The angle α formed by the axis of the cylinder block 27 and the intake port 98 is set to an obtuse angle in a plane orthogonal to the axis of
The support shaft 23 of the link mechanism 24 that supports the power unit P on the vehicle body frame F is arranged at a position sandwiched by the cylinder block 27 and the intake port 98.

In FIG. 13, a recess 101 is provided on the upper surface of the crankcase 28 at a position below the intake pipe 99, and the screw gear 1 provided on the crankshaft 32 is provided.
Input shaft 10 provided with a screw gear 103 meshing with 02.
The oil pump 105 having the
01, and is attached to the crankcase 28.

By the way, the screw gear 103 of the input shaft 104
As shown in FIG. 13, in the crankcase 28, the screw gear 102 meshes with the screw gear 102 of the crankshaft 32 above the crankshaft 32.
Lubrication by the lubricating oil in the transmission case 64 cannot be expected at the meshing portion of 03. Then, as shown in FIG. 14, at least one of the meshing portions, for example, substantially the entire surface of the input shaft 104 having the screw gear 103 is coated with a material having a self-lubricating property, for example, a material containing a fluorine resin or the like, to form a film. 106 is formed.

Here, the input shaft 104 uses SCM as its material.
415H (JIS), carburizing depth 0.2-0.4m
m and surface hardness HRA 78 to 83, the carburizing treatment is performed under the following plating treatment conditions and heat treatment conditions.

[Plating treatment] Plating film thickness: 20 ± 4 μm Plating film composition Ni: 88.2 to 89.3 wt% P: 9.8 to 9.9 wt% Tetrafluoroethylene resin: 0.8 to 2.0 wt % (3.0-
7.0 vol%) Tetrafluoroethylene resin particle size: 1 μm or less Plating film density: 7Z3 to 7.6 g / cm ³ [heat treatment] Treatment temperature: 300 ± 10 ° C. Treatment time: 60 minutes or more Next, action of this example Engine E
During operation, the cooling fan 34 connected to the crankshaft 32 is rotated, and the air sucked from the intake port 56 is discharged from the cooling fan 34 to the cylinder head 26 and the cylinder block 27 side through the scroll passage 35. To go. Here, the scroll passage 35 gradually increases its flow area along the rotation direction 53 of the cooling fan 34. Then, the outer peripheral portion of the second member 38 in the shroud 36 is gradually expanded outward in the radial direction of the cooling fan 34 as it goes downstream in the rotation direction 53, and corresponds to the scroll passage 35 of the second member 38. Bulging portion 3 that bulges outward in the axial direction of the cooling fan 34
By providing 8a, the circulation area of the scroll passage 35 along the rotation direction 53 is increased.
Therefore, the distribution area of the scroll passage 35 is set to the rotational direction 5
It is possible to change ideally along the third direction, and to the second direction outward in the radial direction of the cooling fan 34.
The expansion of the member 38 can be suppressed to the minimum, and the maintainability of the rear wheel Wr can be maintained even if the distance between the cooling fan 34 and the rear wheel Wr is relatively small.
This can contribute to downsizing of the motorcycle V.

The air from the scroll passage 35 is heated by cooling the cylinder head 26 and the cylinder block 27, a part of the air is discharged to the outside, and the remaining heated air is exhausted from the exhaust port 90 to the connecting pipe 91. After that, the air is discharged toward the carburetor 80 by the air guide duct 92. As a result, the vaporizer 80 is kept warm. Moreover, the air cleaner 81 has a cover portion 8 that covers the outside of the carburetor 80.
9 are integrally connected to each other, and the air guide duct 92 is connected to the cover portion 8
Since it is connected to 9, the wind guide duct 92 and the cover portion 89 of the air cleaner 81 can perform a protective action against external environmental factors such as rainfall, splashes and running wind, and vaporization against the external environmental factors. The durability of the container 80 can be improved.

Further, the air outlet 90 is provided by the air guide duct 92.
Since the exhaust air from the carburetor is guided to the carburetor 80, it is not necessary to dispose the carburetor 80 close to the shroud 36, and it is possible to eliminate the restriction in disposing the carburetor 80.

The wind guide duct 92 is housed in the recess 95 of the case member 63 of the transmission case 64 and is arranged so as to be substantially flush with the outer surface of the case member 63, whereby the transmission case is formed. The air cleaner 81, the air guide duct 92, and the transmission case 64, which are arranged above the reference numeral 64, can be arranged so as to obtain a neat appearance and a sense of unity.

The shroud 36 covers the cylinder head 26 and the cylinder block 27 from the front side of the first member 3.
7 and a second member 38 that covers the remaining portion are joined together, and the first member 37 includes a plurality of mounting bolts 4
It is fastened to the cylinder head 26 by 1. Therefore, the space between the cylinder head 26 and the shroud 36 can be set precisely, and the shroud 36 has a flow resistance larger than the flow resistance when the cooling air flows between the fins 39 of the cylinder head 26. Further, it is easy to narrow the interval between the cylinder heads 26, and it is possible to contribute to the improvement of cooling efficiency by the cooling air.
In particular, when the rubber 40 is sandwiched between the shroud 36 and the fins 39 as in this embodiment, the cooling air can be surely circulated between the fins 39, and cooling by the cooling air can be performed. The efficiency can be surely improved. The rubber 40 is used for the cylinder head 2
Since the shroud 36 is attached to the cylinder head 26 with the mounting bolts 41 through the mount rubber 44, the noise due to vibration can be reduced.

In addition, the first member 37 that covers the cylinder head 26 and the cylinder block 27 from the front side is fastened to the cylinder head 26 by the mounting bolts 41 whose mounting direction is aligned with the axis of the cylinder block 27. The shroud 36 with the maintenance lid 49 on the extension of the axis of the cylinder block 27 opened.
It becomes easy to perform the maintenance work of the engine E by removing the first member 37.

By the way, the intake port 98 of the engine E
Is provided on the upper portion of the crankcase 28 so as to form an obtuse angle with the axis of the cylinder block 27 in a plane orthogonal to the axis of the crankshaft 32, so that when the piston 30 moves to the top dead center side, Crankcase 2
It is possible to efficiently inhale the air-fuel mixture into the inside. Further, since the support shaft 23 of the link mechanism 24 that supports the power unit P on the vehicle body frame F is arranged at a position sandwiched between the cylinder block 27 and the intake port 98, the rear wheel W is provided.
The length from the ground contact point of r to the support shaft 23 can be set relatively long, the vertical swing angle of the power unit P can be kept relatively small, and the total height of the engine E can be kept relatively low. The degree of freedom in arrangement of the intake system such as the carburetor 80 and the air cleaner 81 can be increased, and the volume of the article storage chamber 22 can be increased. Moreover, since the oil pump 105 is arranged below the intake pipe 99 so as to be mostly accommodated in the recess 101 provided in the crankcase 28, the intake pipe 99 is connected to the intake port 98 when the intake pipe 99 is connected. The oil pump 105 does not restrict the arrangement of 99,
The degree of freedom in arranging the intake system is further increased.

Further, the input shaft 104 of the oil pump 105
Since the coating 106 is formed by plating with a material having a self-lubricating property, for example, a material containing a fluorine resin or the like, the meshing portion between the screw gear 103 of the input shaft 104 and the screw gear 102 of the crankshaft 32 is formed. , The crankcase 28 where lubrication by the lubricating oil in the transmission case 64 cannot be expected.
Even if it is inside, sufficient lubrication can be obtained.
Therefore, the degree of freedom in arranging the meshing portion, that is, the oil pump 105 can be increased.

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 design changes can be made without departing from the present invention described in the claims. It is possible to do.

For example, the wind guide duct 92 may not be composed of a plurality of members, but may be integrally molded, and a sound absorbing material may be interposed between the wind guide duct 62 and the transmission case 64. It is also possible to absorb the sound emitted from the 64 side.

[0041]

As described above, according to the present invention, the shroud is provided with the intake port facing the cooling fan and the exhaust port arranged on the opposite side of the cylinder with respect to the intake port, and the air cleaner is provided. A cover portion covering the outside of the carburetor is integrally provided, and the other end of the air guide duct, one end of which communicates with the exhaust port, extends toward the carburetor and is connected to the cover portion of the air cleaner. Therefore, the cover of the air cleaner and the duct duct work together to cover the outside of the carburetor to improve the durability of the carburetor against external environmental factors such as rainfall, splashes and running wind. The air can be kept warm by the heat of the exhaust air, and furthermore, the exhaust air from the engine can be guided to the carburetor by the air guide duct, so that the degree of freedom in arranging the carburetor can be increased.

[Brief description of drawings]

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

FIG. 2 is a plan view taken along the arrow 2 of FIG.

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

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

5 is a partially cutaway vertical cross-sectional view taken along line 5-5 of FIG.

6 is an enlarged sectional view taken along line 6-6 of FIG.

FIG. 7 is a view taken along line 7-7 of FIG.

8 is a sectional view taken along line 8-8 of FIG.

9 is a sectional view taken along line 9-9 of FIG.

10 is a sectional view taken along line 10-10 of FIG.

11 is a cross-sectional view taken along line 11-11 of FIG.

12 is an enlarged sectional view taken along line 12-12 of FIG.

13 is an enlarged cross-sectional view taken along line 13-13 of FIG.

FIG. 14 is a cross-sectional view showing an input shaft of the oil pump in an enlarged manner.

[Explanation of symbols]

 26 Cylinder Head 27 Cylinder Block 32 Crank Shaft 34 Cooling Fan 36 Shroud 56 Suction Port 64 Transmission Case 80 Vaporizer 81 Air Cleaner 89 Cover 90 Exhaust Vent 92 Wind Duct E Engine M Continuously Variable Transmission as a Transmission Mechanism V Motorcycle Wr Rear wheel

[Procedure amendment]

[Submission date] November 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

In order to achieve the above object, the present invention provides a carburetor connected to an intake port of an engine above a case of a transmission mechanism provided between a crankshaft and a rear wheel of the engine. A motorcycle in which an air cleaner connected to the carburetor is arranged, and a cooling fan connected to an engine cylinder block, a cylinder head, and a shaft end of a crankshaft is covered with a shroud,
The shroud is provided with an intake port facing the cooling fan and an exhaust port arranged on the opposite side of the cylinder block from the intake port, and the air cleaner is integrally provided with a cover part for covering the outside of the carburetor. The other end of the air guide duct that is connected to the air exhaust port and has one end communicating with the exhaust port is extended toward the carburetor and is connected to the cover portion of the air cleaner.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

A circular hole 55 facing the cooling fan 34 is provided in the second member 38 so as to be coaxial with the crankshaft 32. A large number of suction ports 56 ... The cover 58 attached to the second member 38 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 is filled. Thus a manner corresponding parts to the sound absorbing material 59 of the second member 38 is a large number of holes 60 ... are bored, noise generated in the shroud 3 within 6 sound absorbing material 59 through the holes 60 ... Be absorbed.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

Since the continuously variable transmission M is well known in the prior art, its structure will be briefly described. The crankshaft 32 has a fixed pulley half body 66 fixed to the end of the crankshaft 32. A drive side transmission pulley 68 including a movable pulley half 67 that is mounted on the crankshaft 32 so as to be slidable in the axial direction is provided. Fixed and movable pulley halves 6
A V-shaped annular groove 69 is formed between 6 and 67, and an endless V-belt 70 is inserted into the annular groove 69. A ramp plate 71 is fixed to the crankshaft 32 on the rear surface of the movable pulley half 67.
A plurality of weight rollers 72 are accommodated between 1 and the movable pulley half 67 in a floating state. Then crankshaft 3
When the number of rotations increases during the rotation of 2, the weight roller 72, which receives the centrifugal force, moves radially outward to move the movable pulley half 67 toward the fixed pulley half 66, thereby causing both pulley half to move. it is possible to increase the contact radius of the V belt 7 0 to the body 66.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

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

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction content]

[0041]

As described above, according to the present invention, the shroud is provided with the intake port facing the cooling fan and the exhaust port disposed on the opposite side of the cylinder block from the intake port, and the air cleaner is provided. The cover portion covering the outside of the carburetor is integrally connected, and the other end of the air guide duct whose one end communicates with the exhaust port is extended toward the carburetor and at the same time to the cover portion of the air cleaner. since the connection, on which cooperate with the cover portion and the air guide duct of the air cleaner cover the outer side of the carburetor, aimed rainfall, the durability of the carburetor to external environmental factors such as splash and running wind The carburetor can be kept warm by the exhaust heat, and the exhaust duct from the engine is guided to the carburetor by the air guide duct, so that the degree of freedom in arranging the carburetor can be increased.

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 12

[Correction method] Change

[Correction content]

[Fig. 12]

[Procedure amendment]

[Submission date] December 26, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

Referring also to FIG. 12, a transmission case 64
A vaporizer 80 and an air cleaner 81 connected to the vaporizer 80 are disposed above the. Air cleaner 81
The filter member 84 is sandwiched between the first case member 82 and the second case member 83 coupled to the second case member 82, and the filter member 84 is sandwiched between the first case member 82 and the filter member 84. unpurified chamber 85, also clean chamber 86 is formed between the second case member 8 3 and the filtering material 84. A suction pipe 87, which communicates with the unpurified chamber 85 and opens downward, is connected to the first case member 82, and the carburetor 8 is connected to the second case member 83.
A connecting pipe 88 connected to 0 is integrally provided.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

The first case member 82 of the air cleaner 81 has a cover portion 89 that covers the outside of the carburetor 80.
Extend forward and are integrally connected to each other. The cover portion 89 has a working hole 89a for adjusting the carburetor 80.
Are provided corresponding to the vaporizer 80.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

[Plating treatment] Plating film thickness: 20 ± 4 μm Plating film composition Ni: 88.2 to 89.3 wt% P: 9.8 to 9.9 wt% Tetrafluoroethylene resin: 0.8 to 2.0 wt % (3.0-
7.0 vol%) Tetrafluoroethylene resin particle size: 1 μm or less Plating film density: 7 . ^{3 to} 7.6 g / cm ³ [Heat Treatment] Treatment temperature: 300 ± 10 ° C. Treatment time: 60 minutes or more Next, the operation of this embodiment will be explained.
During operation, the cooling fan 34 connected to the crankshaft 32 is rotated, and the air sucked from the intake port 56 is discharged from the cooling fan 34 to the cylinder head 26 and the cylinder block 27 side through the scroll passage 35. To go. Here, the scroll passage 35 gradually increases its flow area along the rotation direction 53 of the cooling fan 34. Then, the outer peripheral portion of the second member 38 in the shroud 36 is gradually expanded outward in the radial direction of the cooling fan 34 as it goes downstream in the rotation direction 53, and corresponds to the scroll passage 35 of the second member 38. Bulging portion 3 that bulges outward in the axial direction of the cooling fan 34
By providing 8a, the circulation area of the scroll passage 35 along the rotation direction 53 is increased.
Therefore, the distribution area of the scroll passage 35 is set to the rotational direction 5
It is possible to change ideally along the third direction, and to the second direction outward in the radial direction of the cooling fan 34.
The expansion of the member 38 can be suppressed to the minimum, and the maintainability of the rear wheel Wr can be maintained even if the distance between the cooling fan 34 and the rear wheel Wr is relatively small.
This can contribute to miniaturization of the vehicle V.

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 12

[Correction method] Change

[Correction content]

[Fig. 12]

Front Page Continuation (72) Inventor Tadao Hiruma 1-4-1 Chuo, Wako-shi, Saitama, Ltd. Inside Honda R & D Co., Ltd.

Claims (1)

[Claims] 1. An intake port (9) of an engine (E) above a case (64) of a transmission mechanism (M) interposed between a crankshaft (32) of the engine (E) and a rear wheel (Wr).
8), a carburetor (80) and an air cleaner (81) connected to the carburetor (80) are arranged, and the cylinder block (27), the cylinder head (26), and the crankshaft of the engine (E) are arranged. In a motorcycle in which a cooling fan (34) connected to a shaft end of (32) is covered with a shroud (36), a shroud (36) has an inlet (56) facing the cooling fan (34), An exhaust port (90) arranged on the opposite side of the intake port (56) with respect to the cylinder block (27) is provided, and the air cleaner (81) covers the outer side of the carburetor (80) ( 89) integrally connected to each other, and the other end of the wind guide duct (92) having one end communicated with the exhaust port (90) extends toward the carburetor (80) and the air cleaner (8).
A carburetor heat retaining device in a motorcycle, which is connected to the cover portion (89) of 1).