JP2001010582A - Arrangement structure of vehicle component in snow mobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a sufficient vehicle height when arranging a relay rod and an oil pan on a lower end part of a vehicle body. SOLUTION: A steerable ski with a lower surface slidably joined with snow surface is supported by a forward part of a vehicle body frame 3. A steering shaft 31 supported by the vehicle body frame 3 turnable around the axis backward of the steerable ski is provided, a steering handle bar is supported by an upper end part of this steering shaft 31, and a relay rod 39 which is extended long in the longitudinal direction to connect the steering ski to a lower end part of the steerable shaft 31 is provided in an interlocking manner. An internal combustion engine 18 as a traveling drive source is arranged between the steerable ski and the steering shaft 31 in the longitudinal direction, and this internal combustion engine 18 is provided with an oil receiving member 139 on its lower end part. The relay rod 39 and the oil receiving member 139 are continuously arranged in the width direction of a vehicle body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure of vehicle components in a snowmobile,
The present invention relates to an arrangement structure in which components of a steering device and a lubrication device are related to each other.

[0002]

2. Description of the Related Art Conventionally, there is a structure for arranging vehicle components in a snowmobile as described below.

That is, a steering ski whose lower surface is slidably joined to a snow surface is supported at the front of a body frame of a snowmobile. A steering shaft is provided on the body frame so as to be rotatable around a vertical axis behind the steering ski, and a steering handle is supported at an upper end of the steering shaft. A relay rod extending long in the front-rear direction and interlockingly connecting the steering ski to the lower end of the steering shaft.

[0004] In the front-rear direction, an internal combustion engine serving as a traveling drive source is disposed between the steering ski and the steering shaft.

[0005]

By the way, the relay rod connects a steering ski constituting a lower part of the vehicle to slide on a snow surface and a lower end of a steering shaft having a vertical axis. And disposed in the lower end region of the vehicle body. On the other hand, in order to comply with exhaust gas regulations, it has been studied to employ a four-cycle internal combustion engine instead of the conventionally employed two-cycle internal combustion engine. In this case, the oil receiving member constituting the lower end of the internal combustion engine is also arranged in the lower end region of the vehicle body, similarly to the relay rod.

For this reason, if the relay rod and the oil pan are arranged so as to simply avoid interference with each other, the shape of a combination of these relay rods and the oil pan becomes large, and the vehicle height may become too low.

Therefore, the relay rod and the oil pan are juxtaposed in the width direction of the vehicle body, and the vertical dimension of the combined body of the relay rod and the oil pan is reduced to secure a predetermined vehicle height. Can be considered.

However, since the oil pan has a large shape in a plan view, if these relay rods and the oil pan are simply arranged side by side, the dimension of the combined body in the width direction of the vehicle body becomes excessively large. As a result, the degree of freedom in arranging other vehicle components in the lower end region of the vehicle body may be impaired.

The relay rod extends long in the front-rear direction, and easily bends when an external force is applied from below the relay rod. For this reason, it is desired that the relay rod be protected by a simple configuration against a load that rises from the snow surface side during traveling of the snowmobile.

[0010] The present invention has been made in view of the above circumstances, and when the relay rod and the oil pan are provided in the lower end region of the vehicle body, the vehicle height is sufficiently ensured. It is another object of the present invention to maintain the degree of freedom in arranging other vehicle components in the lower end region of the vehicle body even in such a case.

It is another object of the present invention to protect the relay rod against a load from the snow surface by a simple structure.

[0012]

Means for Solving the Problems The arrangement structure of vehicle components in a snowmobile according to the present invention for solving the above-mentioned problems is as follows.

According to the first aspect of the present invention, a steering ski 1 has a lower surface slidably joined to a snow surface S at a front portion of a vehicle body frame 3.
A steering shaft 31 is provided on the body frame 3 behind the steering ski 11 so as to be rotatable around a vertical axis.
A steering rod 29 is supported on the upper end of the steering ski, and a relay rod 39 that extends long in the front-rear direction and is connected to the lower end of the steering shaft 31 in an interlocked manner is provided. An internal combustion engine 18 serving as a traveling drive source is disposed between the vehicle and the steering shaft 31, and the internal combustion engine 18 includes an oil receiving member 139 at a lower end thereof.
And

The relay rod 39 and the oil receiving member 1
39 are arranged side by side in the width direction of the vehicle body 2.

According to a second aspect of the present invention, in addition to the first aspect, a part of the oil receiving member 139 is swelled downward in a plan view of the vehicle body 2, and the inside of the swelled portion 139a is formed. Strainer 1 communicating with the suction side of oil pump 145
The relay rod 39 is disposed in the width direction of the vehicle body 2 near the bulging portion 139a of the oil receiving member 139.
Is arranged.

According to a third aspect of the present invention, in addition to the second aspect, the bulging portion 139a is arranged near the cylinder center 69 in the axial direction of the crankshaft 49 of the internal combustion engine 18.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a snowmobile which can be driven to run on a snow surface S.
Indicates the front of the traveling direction of the snowmobile 1, and the following left and right refer to the snowmobile 1 facing forward.
In the width direction of the vehicle body 2 (hereinafter, simply referred to as “width direction”).

The vehicle body 2 includes a metal vehicle body frame 3 having strength and rigidity extending over substantially the entire longitudinal direction of the vehicle body 2, a side panel 4 covering the vehicle body frame 3 from right and left outer sides, A hood 5 that covers the front part of the body frame 3 so as to be openable and closable from above, a bottom plate 5a made of sheet metal that constitutes a lower front part of the body 2 and covers the front part of the body frame 3 from below, 5, a shield 6 projecting upward from the rear end, a straddle-type seat 7 supported on the upper surface side of the rear part of the vehicle body frame 3, and the vehicle body frame 3 And a pair of left and right footrests 8, 8 supported by the vehicle, and a rider 9 can be seated on the seat 7 in a straddle shape. The vehicle body 2 is substantially symmetrical with respect to the vehicle body center plane 10 which is a vertical virtual plane passing through the center in the “width direction”.

The snowmobile 1 is a pair of left and right steering skis 1 which are slidably supported at the front of a body frame 3 of a vehicle body 2 and whose lower surfaces are slidably joined to the snow surface S.
1, 11; a traveling drive means 12 supported at a middle part in the front-rear direction of the vehicle body frame 3 and a lower surface frictionally joined to the snow surface S; and a traveling drive means supported by a front part of the vehicle body frame 3 A driving device 13 for driving the driving device 12;
The operating force is input from the rider 9 and the steering ski 1 is input.
The vehicle body 2 includes the steering skis 11 and 11 and the traveling drive unit 1.
2 are supported on the snow surface S.

The drive unit 13 is mounted on the vehicle body frame 3
A four-cycle parallel multi-cylinder (two-cylinder) internal combustion engine 18 which is supported by a plurality of engine mounts 17 and serves as a driving source at the front of the vehicle, and a power transmission device 19 for interlocking the driving means 12 to the internal combustion engine 18 And

Each of the steering skis 11 is a ski support shaft 22 which is supported on each front side of the body frame 3 so as to be steerable.
A ski body 23 extending in the front-rear direction and having a middle part in the front-rear direction pivotally supported by the lower end of each of the ski spindles 22. The ski body 23 is centered on the lower end of the ski spindle 22. The front and rear ends are rotatable vertically.

The traveling drive means 12 is rotatably supported at an intermediate portion in the front-rear direction of the vehicle body frame 3, and is rotatably suspended from a rear portion of the vehicle body frame 3 via suspension means 26. It comprises a driven rotating wheel 27 that is freely supported, and a track belt 28 that is wound around the driving rotating wheel 25 and the suspension means 26 and has a lower surface frictionally joined to the snow surface S. It is located on the center plane 10.

In FIGS. 1-4, the steering device 14 comprises:
The body frame 3 is erected on the vehicle body center plane 10 behind the steering skis 11 and in front of the seat 7 so as to be rotatable around an axis which is vertically oriented upward and inclined rearward. A steering shaft 31 which is supported, a steering handle 29 which is supported on an upper end of the steering shaft 31 and is supported via the steering shaft 31 so as to be steerable with respect to the body frame 3; 31 is provided with interlocking means 30 for interlocking and linking each of the steering skis 11, 11. Further, a grip 32 that can be gripped by the rider 9 is provided at each of the left and right ends of the steering handle 29.

The interlocking means 30 is connected to each of the ski spindles 2.
A knuckle arm 35 protruding from the upper end of the steering shaft 31 and a pitman arm 36 protruding from the lower end of the steering shaft 31
A center arm 37 disposed between the left and right knuckle arms 35, 35 in front of the pitman arm 36 and pivotally supported by the body frame 3; and a left and right knuckle extending in the "width direction". A pair of left and right tie rods 38, 38 for linking the arms 35, 35 to the center arm 37, and a relay rod 39 extending in the front-rear direction and rising forward to link the center arm 37 to the pitman arm 36. ing.

3 to 7, the internal combustion engine 18 is disposed between the steering ski 11 and the steering shaft 31 in the front-rear direction, and the internal combustion engine 18 is mounted on the engine mount 17.
And a plurality of (four) bearings 45 to 45 in the axial direction so as to be rotatable about a substantially horizontal axis 44 extending in the “width direction”.
48, a pair of left and right cylinders 50, 50 projecting upward from the crankcase 43 to the outside in the radial direction of the crankshaft 49; A piston 52 fitted in a cylinder hole 51 in each cylinder 50 so as to be slidable in the axial direction thereof;
And a connecting rod 53 for interlocking and connecting the pistons 52 to each other. In this case, the operation of the pistons 52 in the cylinders 50,
It has a phase difference of 0 °.

The crankcase 43 is divided into an upper case 57 and a lower case 58, which are vertically separated from each other by a dividing line 56 which extends substantially forward through the shaft 44 of the crankshaft 49 when viewed from the side of the vehicle body 2. The upper and lower cases 57 and 58 are detachably fastened to each other by fasteners.

Each of the engine mounts 17 includes a bracket 61 detachably fastened to the crankcase 43 by a plurality of fasteners 60, and a rubber elastic material interposed between the bracket 61 and the vehicle body frame 3. And a shock absorber 62 made of the same. Each of the above engine mounts 17
Are arranged before and after the crankcase 43 in a plan view of the vehicle body 2, and the brackets 61 of the engine mount 17 on the front side are respectively fastened by the fasteners 60 over the upper case 57 and the lower case 58 of the crankcase 43. As a result, the upper case 57 and the lower case 58 are more firmly fastened to each other.

Each of the cylinders 50 has a cylinder body 65 projecting upward from the crankcase 43, a cylinder head 66 attached to a projecting end (upper end) of the cylinder body 65, and an upper end of the cylinder head 66. A cylinder head cover 67 detachably attached to the cylinder hole 65, the cylinder body 65, the piston 52 fitted in the cylinder hole 51 of the cylinder body 65, and the cylinder hole 51 surrounded by the cylinder head 66.
Is a combustion chamber 68. The cylinder bodies 65, 65, the cylinder heads 66, 66, and the cylinder head covers 67, 67 of the cylinders 50 are integrally formed with each other.

The axes of the cylinder holes 51 of the cylinders 50 extend parallel to each other, and are parallel to these axes.
An imaginary straight line located at the center of these axes in the “width direction” is the cylinder center 69. In the axial direction of the crankshaft 49, the center of the crankshaft 49 is located at substantially the same position as the cylinder center 69.

The cylinder head 66 of the cylinder 50 has an intake passage 7 for communicating the outside with the combustion chamber 68.
A plurality (three) of intake valves 73 that allow the intake passage 72 to open and close are supported by the cylinder head 66, and urge each of the intake valves 73 to close the intake passage 72. A spring 74 is provided.

The cylinder head 66 of the cylinder 50 has an exhaust passage 7 for communicating the combustion chamber 68 with the outside.
A plurality (two) of exhaust valves 77 that allow the exhaust passage 76 to open and close are supported by the cylinder head 66, and urge the exhaust valves 77 to close the exhaust passage 76. A spring 78 is provided.

A valve operating mechanism 81 for opening and closing the intake valve 73 and the exhaust valve 77 at a predetermined crank angle is provided inside the protruding end (upper end) of the cylinder 50.
The valve mechanism 81 includes a cam chamber 82 formed between the cylinder head 66 and the cylinder head cover 67,
A pair of front and rear cam shafts 84 and 85 are provided in the cam chamber 82 and arranged side by side so as to be parallel to the crankshaft 49. Each of the cam shafts 84 and 85 rotates around its axis. It is supported by the cylinder head 66 so as to be free.

Of the two cam shafts 84 and 85, one cam shaft 84 is cam-engaged with the intake valve 73 via a tappet 86 by rotation about its axis to open and close the other cam shaft. The shaft 85 rotates by the rotation about the axis, and the exhaust valve 77
The two camshafts 84 and 85 are interlockingly connected to each other by a gear set or the like.

A chain winding transmission means 90 for linking the two cam shafts 84 and 85 of the valve mechanism 81 to the crankshaft 49 is provided. The chain winding transmission means 90 includes a drive chain wheel 91 attached to the crankshaft 49 on the shaft center 44 of the crankshaft 49 and an inside of a projecting end of the cylinder 50 attached to one end of the camshaft 84. And a chain 93 wound around the driven wheel 91 and the driven wheel 92.

The driven wheel 92 is twice as large as the pitch diameter of the drive wheel 91. When the internal combustion engine 18 is driven, the chain winding transmission means 90 and each camshaft 84 are driven by the rotation of the crankshaft 49. , 85 and each tappet 86, 8
The intake valve 73 and the exhaust valve 77 are respectively operated to open and close at a predetermined crank angle via the switch 7.

In the above case, the traveling drive means 12 is interlocked to the one end 49a (left end), which is the free end of the crankshaft 49, via the drive device 13, while the free end of the crankshaft 49 is The drive chain wheel 91 is attached to a certain other end 49b (right end).

Inside the crankcase 43, balancers 95, 9 are provided in front of and behind the crankshaft 49, respectively.
The balancers 95 and 96 are supported by the crankcase 43 so as to be rotatable around their respective axes. The balancers 95 and 96 are connected to the crankshaft 49 by a gear set. ing.

An intake system member for supplying a mixture of air and fuel to the combustion chamber 68 through the intake passage 72 is provided.

The intake system member includes an intake pipe 97 extending rearward from the rear surface of the cylinder body 65 of the cylinder 50.
And a carburetor 9 attached to the extension end of the intake pipe 97.
8, another intake pipe 99 extending from the vaporizer 98,
An intake silencer 101 which is attached to an extension end of the intake pipe 99 and also serves as an air cleaner 100 is provided. The intake pipes 97 and 99 are formed of rubber elastic material buffer pipes.

Each internal passage of each of the members 97 to 101 is
In this order, the combustion chamber 68 passes through the intake passage 72.
And the outside of the cylinder 50 with the atmosphere.
Further, a fuel tank 10 for supplying fuel to the carburetor 98 is provided.
2 is disposed between the hood 5 and the seat 7.

In the combustion chamber 68, there is provided an exhaust system member for discharging the combustion gas after the combustion of the air-fuel mixture to the outside of the cylinder 50 as exhaust gas.

The exhaust system member is provided between the exhaust pipe 104 and the exhaust pipe 104 that extends forward from the front surface of the cylinder body 65 of the cylinder 50 and then extends rearward. Rubber elastic material buffer 1 to be provided
05, and an exhaust silencer 106 attached to the extension end of the exhaust pipe 104.

Each of the suction and exhaust system members is covered by the hood 5 so as to be openable and closable from above. The opening operation of the hood 5 facilitates maintenance and inspection work on each of the above members. I have.

An ignition plug 109 is attached to the cylinder head 66 of the cylinder 50.
The discharge section 09 faces the combustion chamber 68. The ignition plug 109 is connected to an engine control device (not shown).

A flywheel magneto 111 capable of generating power by being linked to the crankshaft 49 is provided. The flywheel magneto 111 extends in the axial direction of the crankshaft 49,
b (right end). The flywheel magneto 111 includes a housing 112 that constitutes an outer shell thereof and is attached to the drive device 13, and a crankcase that is included in the housing 112 and is rotatable around the axis 44 through the housing 112. 43 and the housing 11
And a stator supported on the second side and opposed to the rotor 113. The rotor 113 is linked to the other end 49 b of the crankshaft 49 by a joint 114. In this case, the crankshaft 49 and the support shaft for the rotor 113 are separated from each other and are connected by the joint 114. Therefore, the crankshaft 49 is prevented from being too long, and the molding thereof is prevented. It can be easily done.

The internal combustion engine 18 is provided with a starting device 116 that can start the internal combustion engine. This starting device 116
Is a gear 11 attached to the crankshaft 49 for transmitting the power of a cell motor (not shown) to the crankshaft 49.
7 and a recoil starter 118 interlocked with the crankshaft 49 via the rotor 113. The crankshaft 49 is rotated by operation of either the starter motor or the recoil starter 118, that is, cranking is possible. It has been.

In FIG. 1 to FIG.
The automatic transmission device 120 is disposed on one side (left side) of the driving rotary wheel 25 of the traveling driving means 12 and the output is disposed on the other side (right side) of the driving rotary wheel 25. Gear type reduction gear 1 having a shaft interlockingly connecting the driving rotary wheels 25
21 and a power transmission shaft 12 disposed above the driving rotary wheel 25 and extending in the “width direction” to link an input shaft of a gear type reduction gear 121 to an output side of the automatic transmission 120 in an interlocking manner.
2 is provided.

The automatic transmission 120 includes a drive pulley 124 attached to one end 49a (left end) of the crankshaft 49, and a driven pulley 125 attached to one end (left end) of the power transmission shaft 122. A belt 126 wound around the driving pulley 124 and the driven pulley 125. If the rotation of the driving pulley 124 increases with the rotation of the crankshaft 49, the reduction ratio of the automatic transmission 120 is increased in accordance with the increase. The automatic transmission is made possible so as to reduce.

When driving the snowmobile 1 for traveling, first, the cranking is performed by the starting device 116, and the internal combustion engine 18 is started.

When the internal combustion engine 18 is driven, the crankshaft 49, the piston 52, and the connecting rod 53 are interlocked with each other, and the rotation of the crankshaft 49 is transmitted through the chain winding transmission means 90 to the valve operating mechanism. 81 camshafts 8
4 and 85 are rotated, and these cam shafts 84 and 85 are rotated.
The intake valve 73 and the exhaust valve 77, which are cam-engaged via the tappets 86 and 87, are opened and closed at a predetermined crank angle.

With the opening and closing operation of the intake valve 73 and the exhaust valve 77, air outside the internal combustion engine 18 is sucked through the intake system members 97 to 101 toward the combustion chamber 68 of the cylinder 50. At the same time, the fuel in the fuel tank 102 is also sucked through the carburetor 98 together with the air. Thereby, the air-fuel mixture is sucked into the combustion chamber 68, and is ignited and burned by the discharge of the spark plug 109 in the explosion stroke. The combustion gas generated by this combustion is exhausted to the outside of the internal combustion engine 18 through the exhaust system members 104 to 106 as exhaust gas.

The heat energy generated by the combustion is converted into a driving force and output from the crankshaft 49, and the driving force is transmitted to the automatic transmission 120 of the power transmission device 19,
The power is transmitted to the driving rotary wheel 25 of the traveling drive unit 12 via the power transmission shaft 122 and the gear type reduction gear 121 in order. Then, the track belt 28 interlocking with the driving rotary wheel 25 is circulated and rotated.
8 moves backward while being frictionally joined to the snow surface S, so that the snowmobile 1 can travel forward.

If the steering handle 29 of the steering device 14 is steered during the traveling, the steering shaft 31, the pitman arm 36 of the interlocking means 30, the relay rod 39, the center arm 37 , Each tie rod 3
8, and each knuckle arm 35 and ski spindle 2
2, the steering skis 11 are steered, and the snowmobile 1 is steered in the desired left and right directions.

2, 3, 5, and 6, the internal combustion engine 18 includes a lubricating device 130 for lubricating a portion to be lubricated such as each of the bearings 45 to 48 in the internal combustion engine 18. The lubricating device 130 is a dry sump type. It has been.

The lubricating device 130 is provided with an oil tank 132 for storing a lubricating oil 131, and the lubricating oil 131 in the oil tank 132 is sucked through an oil passage 133, while the lubricating oil is supplied to the lubricated portion through an oil passage 134. An oil pump 135 for supplying the pressurized oil 131 to the oil passage 131;
And an oil filter 136 that is disposed in the middle of the crankshaft 49 and filters the lubricating oil 131. The oil pump 135 is linked to the other end 49b of the crankshaft 49 by a gear set 137.

The internal combustion engine 18 has an oil receiving member 139 at the lower end thereof. The oil receiving member 139 has a dish shape that opens upward, and the oil receiving member 139 has an oil receiving member 139.
Is detachably fastened to a front rising surface of the crankcase 43 by a fastener. The above crankcase 43
A space surrounded by the oil chamber 140 and the oil receiving member 139 is a sealed oil chamber 140, and the lubricating oil 131 after lubricating the lubricated portion is collected in the oil chamber 140 in a naturally flowing manner. I have. The lubricating device 130 may be of a wet sump type. In this case, the oil receiving member 139 is called an oil pan.

The lubricating device 130 is connected to the oil chamber 14
The oil pump 145 is provided with a return oil pump 145 that allows the lubricating oil 131 in the cylinder 0 to be sucked through the strainer 142 and that can be returned to the oil tank 132 through the oil passage 143 and the water-cooled oil cooler 144. Is the other end 49 of the crankshaft 49 by the gear set 137.
b.

When the internal combustion engine 18 is driven, the oil pumps 135 and 145 operate in conjunction with the crankshaft 49, and the lubricated oil 131 discharged from the supply oil pump 135 causes the lubricated portion to be driven. While being lubricated, the lubricating oil 131 collected in the oil chamber 140 is returned to the oil tank 1 by the return oil pump 145.
It is returned to 32. In this case, the capacity of the return oil pump 145 is greater than that of the supply oil pump 135, and the lubricating oil 131 is prevented from accumulating in the oil chamber 140.
9 is made as small as possible.

In the above configuration, the relay rod 39
And the oil receiving member 139 in the longitudinal direction of the vehicle body 2
Are arranged side by side in the width direction.

For this reason, the vertical dimension of the combined bodies 39 and 139 is smaller than when the relay rod 39 and the oil receiving member 139 are simply arranged vertically.

Accordingly, the vehicle height is sufficiently secured. This effect is further enhanced because the lubricating device 130 is of a dry sump type, and the size of the oil receiving member 139 in the depth direction, that is, the size in the vertical direction, is reduced.

In a plan view of the vehicle body 2, only a part of the oil receiving member 139 is swelled downward, and an oil pump 145 for returning the oil 145 to the inside of the swelling portion 139a.
A strainer 142 that communicates with the suction side is provided.

For this reason, the oil receiving member 139 has only a portion for accommodating the strainer 142 which is enlarged as the bulging portion 139a.
Is suppressed from becoming large.

Therefore, the vehicle height is sufficiently secured while the strainer 142 is provided inside the oil receiving member 139.

Further, an intermediate portion of the relay rod 39 is disposed near the bulging portion 139a of the oil receiving member 139 in the width direction of the vehicle body 2.

That is, the bulging portion 139a is formed only by a part of the oil receiving member 139, and the relay rod 39 and the bulging portion 139a are arranged close to each other in the width direction of the vehicle body 2. The Rukoto.

Therefore, the relay rod 39 and the bulging portion 1
The size of the combination body 39, 139 with the body 39a in the width direction of the vehicle body 2 is suppressed to be small, and accordingly, the degree of freedom in disposing other vehicle components in the lower end region of the vehicle body 2 is kept good.

On the other hand, the relay rod 39 and the internal combustion engine 1
The oil receiving member 139 of FIG.
However, when the snowmobile 1 travels, the bottom plate 5a may be pushed upward due to collision with a projection on the snow surface S. At this time, there is a possibility that an external force may be applied to the middle part in the longitudinal direction of the relay rod 39 from the bottom plate 5a pushed up as described above.

However, as described above, the relay rod 39
The middle part in the longitudinal direction and the bulging part 139a are arranged close to each other in the width direction of the vehicle body 2, and the relay rod 3
9, since the lower surface of the bulging portion 139a is located lower than the middle portion of the relay rod 9, the relay rod 39 is attached to the bottom plate 5a.
Contacting the relay rod 39 and applying a large external force to the relay rod 39 means that the bulging portion 139a tends to abut the bottom plate 5a earlier, and the bulging portion 139
a is opposed to the bottom plate 5a with a larger force.

Therefore, the relay rod 39 is mounted on the snow surface S
By using the bulging portion 139a for a load from the side,
That is, it is protected by a simple configuration.

The crankshaft 49 of the internal combustion engine 18
The bulging portion 139a is disposed in the vicinity of the cylinder center 69 in the axial direction.

For this reason, when the lubricating oil 131 after lubricating the respective parts of the cylinder 50 flows in a natural flow manner toward the cylinder center 69, these lubricating oils 131 are swollen by the bulging portions 139a near the cylinder center 69. Toward each other and flow equally to each other.

Therefore, it is possible to prevent a part of the lubricating oil 131 after lubrication of each lubricated portion from stagnating, thereby preventing uneven lubrication, and to ensure good lubrication in each lubricated portion.

In FIG. 2 and FIG.
Reference numeral 2 denotes a “width direction”, which is disposed on the opposite side of the drive pulley 124 of the automatic transmission 120 with respect to the cylinder center 69, so that the left and right weight balance of the snowmobile 1 is excellent. It is maintained and the maneuverability is well maintained.

The oil tank 132 is arranged near the rear of the cylinder 50 of the internal combustion engine 18 and above the flywheel magneto 111.

[0077]

The effects of the present invention are as follows.

According to a first aspect of the present invention, a steering ski having a lower surface slidably joined to a snow surface is supported on a front portion of the body frame, and a vertical shaft is provided on the body frame behind the steering ski. A steering shaft supported to be rotatable around the center is provided, and a steering handle is supported at the upper end of the steering shaft. A relay rod for interlocking connection is provided at a lower end portion, and an internal combustion engine serving as a traveling drive source is disposed between the steering ski and the steering shaft in the front-rear direction, and the internal combustion engine has an oil pan at a lower end portion thereof. A snowmobile

The relay rod and the oil pan are juxtaposed in the width direction of the vehicle body.

For this reason, the vertical dimension of this combined body is smaller than when the relay rod and the oil pan are simply arranged vertically.

Accordingly, the vehicle height is sufficiently secured.

According to the second aspect of the present invention, a part of the oil pan is bulged downward in a plan view of the vehicle body, and a strainer communicating with the suction side of the oil pump is provided inside the bulge. It is arranged.

For this reason, the oil pan is only enlarged by using a portion for accommodating the strainer as a bulging portion, so that the oil pan is prevented from becoming large.

Therefore, the vehicle height can be sufficiently secured while the strainer is provided inside the oil pan.

Further, the relay rod is disposed in the width direction of the vehicle body near the bulging portion of the oil pan.

That is, the bulging portion is formed by a part of the oil pan, and the relay rod and the bulging portion are arranged close to each other in the width direction of the vehicle body.

Accordingly, the dimension of the combination of the relay rod and the bulging portion in the width direction of the vehicle body is suppressed to be small, and accordingly, the degree of freedom in disposing other vehicle components in the lower end region of the vehicle body is good. Is kept.

On the other hand, the relay rod and the oil pan of the internal combustion engine are usually covered with a bottom plate from below, but when the snowmobile is running, the bottom plate collides with a protruding portion on the snow surface. May be pushed up. At this time, there is a possibility that an external force may be applied to the middle part in the longitudinal direction of the relay rod from the bottom plate pushed up as described above.

However, as described above, since the relay rod and the bulging portion are disposed close to each other in the width direction of the vehicle body, the bottom plate comes into contact with the relay rod, and a large external force is applied to the relay rod. This is prevented by the bulges opposing the bottom plate with greater force.

Therefore, the relay rod is protected against the load from the snow surface side by using the bulging portion, that is, by a simple configuration.

According to a third aspect of the present invention, the bulging portion is disposed near the cylinder center in the axial direction of the crankshaft of the internal combustion engine.

For this reason, when the lubricating oil after lubricating each part of the cylinder flows down toward the center of the cylinder, the lubricating oil flows uniformly toward the bulging portion near the center of the cylinder and collects each other. Can be

Therefore, it is possible to prevent the lubricating oil from stagnating in some of the lubricated portions of each lubricated portion, thereby preventing uneven lubrication, and to ensure good lubrication in each lubricated portion.

[Brief description of the drawings]

FIG. 1 is an overall side view of a snowmobile.

FIG. 2 is an overall plan view of the snowmobile.

FIG. 3 is a partially enlarged detailed view of FIG. 1;

FIG. 4 is a partially enlarged detailed view of FIG. 2;

FIG. 5 is a partially enlarged partial sectional view of FIG. 1;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 3;

FIG. 7 is a partially enlarged sectional view of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Snowmobile 2 Body 3 Body frame 11 Steering ski 14 Steering device 18 Internal combustion engine 29 Steering handle 31 Steering shaft 39 Relay rod 43 Crankcase 49 Crankshaft 69 Cylinder center 130 Lubricating device 131 Lubricating oil 132 Oil tank 139 Oil Receiving member 139a Swelling part 142 Strainer 145 Oil pump

Claims (3)

[Claims] 1. A steering ski having a lower surface slidably joined to a snow surface is supported on a front portion of a vehicle body frame, and the vehicle body frame is rotated about a vertical axis behind the steering ski. A steering shaft is provided so as to be freely supported, and a steering handle is supported at an upper end of the steering shaft. The steering ski extends in the front-rear direction and is interlocked with the lower end of the steering shaft. A driving rod is provided between the steering ski and the steering shaft in the front-rear direction, and the internal combustion engine is a snowmobile having an oil pan at a lower end thereof. An arrangement structure of vehicle components in a snowmobile in which the relay rod and the oil pan are juxtaposed in the width direction of the vehicle body. 2. A plan view of the vehicle body, wherein a part of the oil pan is swelled downward, and a strainer communicating with the suction side of the oil pump is provided inside the swelling portion. 2. The arrangement structure of vehicle components in a snowmobile according to claim 1, wherein the relay rod is disposed in the direction near the bulging portion of the oil pan. 3. 3. The structure for arranging vehicle components in a snowmobile according to claim 2, wherein the bulging portion is arranged near the center of the cylinder in the axial direction of the crankshaft of the internal combustion engine.