JP3385680B2 - Snow car - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow vehicle, and more particularly,
The present invention relates to a snow vehicle suitable for improving steering stability and reducing vibration transmitted from an engine to a vehicle body.

[0002]

2. Description of the Related Art Conventionally, a snow vehicle equipped with a two-cycle engine has a structure in which a starter motor for starting the engine is arranged near the engine. FIG. 4 is a configuration diagram of a main part of a snow vehicle 50 according to a conventional example. Inside a hood 51, a cylinder head 52, a cylinder 53, a crankcase 54, a carburetor 55, an oil pump 56, an intake manifold 57, an exhaust manifold 58, and the like. In addition to accommodating the engine 59 and the like equipped with a starter motor 60, the starter motor 60 is disposed below the exhaust manifold 58 (on the substantially horizontal center line of the crankcase 54). The reason why the starter motor 60 has the arrangement structure is that the intake port and the carburetor 55 are provided on the inlet side of the engine 59. Reference numeral 61 in the figure,
Reference numeral 62 indicates an engine mount rubber that supports the engine 57 on the vehicle body frame 50A, reference numeral 63 indicates a chamber, reference numeral GS indicates the center of gravity of the vehicle, and reference numeral GE indicates the center of gravity of the engine.

FIG. 5 shows a snow vehicle 70 according to another conventional example.
FIG. 9 is a configuration diagram of a main part of a piston port type engine 79 including a cylinder head 72, a cylinder 73, a crankcase 74, a carburetor 75, an oil pump 76, an intake manifold 77, an exhaust manifold 78, and the like inside a hood 71. And the like, and the starter motor 80 is arranged below the inlet (above the horizontal center line of the crankcase 74). The reason why the starter motor 80 has the arrangement structure is that a space is generated below the inlet of the engine 79 due to the high position of the inlet of the engine 79. In the figure, reference numerals 81 and 82 denote engine mount rubbers for supporting the engine 79 on the vehicle body frame 70A, reference numeral 83 denotes a chamber, reference numeral GS denotes a vehicle body center of gravity, and reference numeral GE denotes an engine center of gravity.

[0004]

However, the above-mentioned prior art has the following problems. That is, in the case of the snow vehicle shown in FIG. 4, the heavy starter motor is arranged at a position distant from the vehicle body weight center GE, and
Since the structure is arranged on or above the horizontal centerline of the crankcase, the position of the starter motor relative to the center of gravity GE of the vehicle and the balance between the weight of the starter motor and the engine weight contributes to the vehicle body when the snowmobile is running. There is a problem that the moment to act increases and good steering stability cannot be obtained. Further, since the starter motor is arranged near the high temperature portion of the exhaust manifold, the high temperature heat generated from the exhaust manifold is easily transferred to the starter motor, which has a problem of affecting the life of the starter motor.

Further, in the case of the snow vehicle shown in FIGS. 4 and 5, since the starter motor is arranged on the side portion of the engine, there is a problem that the mount of the engine on the vehicle body frame is restricted, and inevitably. In addition, since the lower side of the engine is supported by the vehicle body frame by the engine mount rubber (buffer rubber), the vibration of the engine is increased and the vibration isolation property is not good. Further, in a snow vehicle, the V-belt is wound between the pulley fixed to the crankshaft of the engine and the driven clutch, and the engine torque is transmitted to the drive wheels via the driven clutch. Since a hard engine mount rubber having rigidity is used to properly maintain the engine, there is a problem that engine vibration is easily transmitted to the vehicle body.

[0006]

It is an object of the present invention to improve the inconvenience of the above-mentioned conventional example, and in particular, to improve the steering stability and to transmit it from the engine to the vehicle body by improving the arrangement of the starter motor and the mount of the engine. It is an object of the present invention to provide a snow vehicle capable of reducing vibration and the like.

[0007]

Means for Solving the Problems The present invention of claim 1 includes an engine cylinder at the top is erected in the crankcase, and a starter motor for starting, the engine
Fixed to the body frame via at least two cushioning members
And the snowmobile comprising, said starter motor, said
The cylinder with respect to the horizontal centerline of the crankcase
Located on the opposite side of the exhaust manifold attached to the
And place the at least two cushioning members on the starter.
It should be placed above the location of the motor and
A space where the starter motor can be stored in the body frame
The starter frame is configured as a body frame having a portion.
Is disposed in the space of the body frame, and
The crankcase approximately on the centerline of the cylinder.
It is arranged on the lower side of the space . This aims to achieve the above-mentioned object.

The present invention according to claim 2 provides at least two of the above.
Of the cushioning member, at substantially symmetrical with respect to center of gravity of the engine, and a buffer member of the engine front side Exhaust
Between the manifold and the starter motor,
The cushioning member on the rear side of the engine is
Note that it is arranged between the starter motor and the starter motor . This aims to achieve the above-mentioned object.

[0009]

According to the first aspect of the present invention, the starter motor is arranged substantially on the center line of the cylinder and below the crankcase.
Side, that is, the cylinder installed upright on the top of the crankcase
Since it is located on the opposite side of the motor, the weight of the engine and starter motor should be balanced compared to the conventional case where the starter motor is placed on the horizontal line passing through the center of the crankcase or above it. It becomes possible to lower the center of gravity of the storage place inside the snow vehicle such as heavy engine and starter motor, and as a result, it is possible to improve the steering stability when the snow vehicle is running. Becomes Also , place the starter motor above the horizontal centerline of the crankcase.
Contrary to the exhaust manifold attached to the cylinder
The starter motor can be prevented from being affected by the high-temperature exhaust heat generated from the exhaust pipe because it is located on the opposite side, that is, at a position separated from the exhaust pipe attached to the cylinder. It is possible to always operate the motor in a stable state. In addition,
Has a space for storing the starter motor
Configured as a vehicle body frame that, the starter motor, since the disposed in the space portion of the body frame, it is possible to reduce the vehicle bottom side than in the conventional mounting position relative to the vehicle body frame of the engine, as a result, snowmobile It is possible to improve the steering stability when the vehicle is running.
Moreover, at least fixing the engine to the body frame
Since the two cushioning members are arranged above the place where the starter motor is arranged, the engine is supported at a higher position than the conventional one with respect to the body frame, and as a result, engine vibration transmitted to the body is reduced. It becomes possible to do.

According to the present invention of claim 2, the above-mentioned
At least two cushioning members are almost symmetrical with respect to the center of gravity of the engine
And the cushioning member on the front side of the engine is an exhaust
Between the Nihold and the starter motor, also the engine
The cushioning member on the rear side is the intake manifold and the starter.
Since it is placed between the motor and the motor, it is possible to disperse the vibration generated from the engine through the cushioning member that is located almost symmetrically with respect to the center of gravity of the engine, and as a result, reduce the engine vibration transmitted to the vehicle body. Is possible.

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

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

First, the overall structure of the snowmobile according to this embodiment will be described with reference to FIG. 2. The snowmobile 1 contains a 2-cylinder 2-cycle engine 2, a starter motor 3, a chamber 4 and the like. A vehicle body 8 equipped with a hood 5, a driver's seat 6, a windshield 7, etc., a plurality of drive wheels 9 and driven wheels 10 and 11, a running truck 12 wound around the wheels, and a vehicle body 8 of the vehicle body 8. Skis 14 and 15 on the right and left sides of the front for skiing on snow (on ice)
And an operation handle 16 and the like.
Reference sign G1 in the drawing indicates the vehicle body weight.

Next, the structure inside the hood of the snowmobile 1 is shown in FIG.
In the interior of the hood 5, a two-cylinder two-cycle engine 2, a starter motor 3, and a chamber 4 connected to an exhaust manifold 23, which will be described later, will be described.
The driven clutch 17, the drive wheel 9, and the like are stored. The engine 2 includes a cylinder 19 equipped with a cylinder head 18 and a cylinder 25 equipped with a cylinder head 24 (see FIG. 3), a crankcase 20, a carburetor 21, and a passage for an air-fuel mixture supplied from the carburetor 21 to the cylinder 19. Intake manifold 22
An exhaust manifold 23, which serves as a passage for exhaust gas discharged from the cylinder 19, an oil pump (not shown), and the like.

In this case, in FIG. 1, the cylinder head 18, the cylinder 19, the carburetor 21, the intake manifold 22, the exhaust manifold 23 on the left side with respect to the width direction of the crankcase 20 (the vehicle body width direction of the snowmobile 1).
The cylinder head 24 on the right side with respect to the width direction of the crankcase 20 (the vehicle body width direction of the snowmobile 1),
Illustration of the cylinder 25 (see FIG. 3 above), the carburetor, the intake manifold, and the exhaust manifold is omitted.

Crank output shaft 26 of crankcase 20
A drive clutch 27 is fixed to one end of the drive clutch 27, and a V-belt 28 is wound between the drive clutch 27 and the driven clutch 17. Further, the driven clutch 17 is mounted on one end portion in the axial direction of the driven shaft 29 arranged horizontally in the vehicle body width direction,
The plurality of drive wheels 9 ... Are fixed to the drive shaft 30 arranged horizontally in the vehicle width direction at predetermined intervals in the axial direction. In this case, the driven clutch 17
Are arranged on the left side with respect to the longitudinal centerline of the vehicle body.

Further, a pulley 29A fixed to the other axial end of the driven shaft 29 and a drive shaft 30.
Between the pulley 30A fixed to the other axial end of
The chain 31 is wound around. As a result, the torque of the engine 2 is increased by the V belt 28 and the driven clutch 1.
As a result of being transmitted to the drive wheel 9 via 7 and rotating the drive wheel 9, the snowmobile 1 travels on the snow (on ice) via the track 12. In this case, the drive drop case (not shown) accommodating both the pulleys 29A and 30A and the chain 31 is arranged on the right side with respect to the center line in the longitudinal direction of the vehicle body.

The engine 2 described above has engine mount brackets 33, 34 and engine mount rubbers 35, 3 with respect to a main frame 32 mounted inside the vehicle body 8.
It is supported and fixed via 6. That is, the front side of the engine 2 is fixed between the exhaust manifold 23 in the main frame 32 and the starter motor 3 via the engine mount bracket 33 and the engine mount rubber 35, and the rear side of the engine 2 is Mount bracket 34 and engine mount rubber 3
It is fixed between the intake manifold 22 and the starter motor 3 in the main frame 32 via 6.

In this case, the engine mount bracket 3
Since small and highly rigid members are used as 3, 34, it is possible to prevent the occurrence of resonance and the like, reduce the vibration of the engine 2, and reduce the weight of the support mechanism for the main frame 32 of the engine 2. The cost can be reduced.

A starter motor 3 for starting the engine is disposed below the engine 2, and the starter motor 3 is rotationally driven based on an operation of an engine start key provided on the snowmobile 1 to The rotational driving force is transmitted to the crankshaft 26 of the engine 2 via a gear (not shown) or the like. By arranging the starter motor 3 in the lower part of the engine 2, the weight of the starter motor 3 and the weight of the two cylinders of the engine 2 are balanced, so that the center of gravity G2 of the engine is set to the crankcase 20.
It can be located near the center C of the (crankshaft 26).

The starter motor 3 has the cylinder head 1 with respect to the horizontal center line L of the crankcase 20.
8 and 24 and the cylinders 19 and 25 are arranged on the opposite side. As a result, the starter motor 3, which is a heavy load, is arranged in the vicinity of the vehicle body weight center G1 as compared with the starter motor of the conventional snow vehicle (see FIG. 4).
It is possible to improve the steering stability when the snowmobile 1 travels.

Further, the starter motor 3 is arranged in a space portion of the main frame 32 (see FIG. 3) having a substantially U-shaped cross section. As a result, the mounting position of the engine 2 inside the hood 5 can be lowered to the vehicle body bottom side than the mounting position of the engine of the conventional snow vehicle, and thus the steering stability during traveling of the snow vehicle 1 is improved in the same manner as above. It can be done.

The starter motor 3 is arranged on the side opposite to the exhaust manifold 23 with respect to the horizontal centerline L of the crankcase 20. This allows
Since it is possible to prevent the high temperature exhaust heat generated from the exhaust manifold 23 from affecting the starter motor 3, the starter motor 3 can always be operated in a stable state.

Further, the engine mount rubbers 35 and 36 and the engine mount brackets 33 and 34 are arranged at positions substantially symmetrical with respect to the center of gravity G2 of the engine, and
Since the engine 2 is fixed to the main frame 32 via the engine mount rubbers 35 and 36 and the engine mount brackets 33 and 34 arranged at a position higher than the mounting position of the starter motor 3, the engine 2 The vibration transmitted to the car body can be reduced.

By the way, when the engine torque fluctuates due to sudden acceleration of the snow vehicle or engine misfire, the engine amplitude becomes maximum. However, in the snow vehicle, there is a gap between the pulley fixed to the crankshaft of the engine and the driven clutch. Since torque is transmitted to the drive wheels via the V-belt wrapped around the V-belt, if the axial distance between the engine and the driven clutch changes due to engine vibration or torque fluctuation, the V-belt tension changes. As a result, the torque transmission efficiency decreases,
The acceleration performance of the snowmobile will also decrease.

Therefore, in this embodiment, the starter motor 3
Is arranged in the lower portion of the engine 2 in the above-mentioned positional relationship, and the engine mount rubbers 35, 36 are arranged at positions substantially symmetrical with respect to the engine center of gravity G2. In other words, between the engine mount rubbers 35, 36. The center of vibration of the engine 2 is located in the vicinity of the center C of the crankshaft 26 by setting the axis connecting the two to pass near the center of gravity G2 of the engine. As a result, the change in the axial distance between the engine 2 and the driven clutch 17 can be minimized, so that the torque transmission efficiency of the engine 2 with respect to the drive wheels 9 can be improved.

Next, the operation of this embodiment constructed as described above will be described.

When the driver of the snowmobile 1 operates the engine start key, the starter motor 3 starts to drive and its rotational driving force is transmitted to the crankshaft 26 of the engine 2 through a gear (not shown) or the like. The engine 2 starts. When the crank shaft 26 rotates with the start of the engine 2, the driven clutch 17 is driven via the V belt 28 wound between the drive clutch 27 fixed to the crank shaft 26 and the driven clutch 17.

As a result, the drive wheel 9 is rotationally driven via the chain 31 wound between the pulley 29A fixed to the driven shaft 29 and the pulley 30A fixed to the drive shaft 30. That is, since the torque generated by driving the engine 2 is transmitted to the drive wheels 9 via the V-belt 28, the driven clutch 17, and the chain 31, the snowmobile 1 circulates via the drive wheels 9 and the driven wheels 10 and 11. The truck 12 is composed of an endless belt 12 and the like.

By the way, in the snowmobile of this embodiment, the starter motor 3 is arranged below the engine 2 so that the center of gravity G2 of the engine is located near the center C of the crankshaft, and
Since the engine mount rubbers 35 and 36 are arranged at positions substantially symmetrical with respect to the engine center of gravity G2,
It is possible to position the center of vibration of the engine 2 near the center C of the crankshaft 26, and as a result, it is possible to minimize the change in the inter-axis distance of the V-belt 28, and the torque transmission efficiency of the engine 2 to the drive wheels 9. Can be improved.

Further, in the snowmobile of the present embodiment, the starter motor 3 is provided with the cylinder heads 18 and 24 and the cylinders 19 and 25 with respect to the horizontal center line L of the crankcase 20.
Since it is arranged on the side opposite to, the starter motor 3 which is a heavy object can be arranged closer to the vehicle body weight center G1 than the starter motor of a conventional snow vehicle, and as a result,
It is possible to improve the steering stability when the snowmobile 1 travels.

Further, in the snowmobile of this embodiment, since the starter motor 3 is arranged in the space portion of the main frame having a substantially U-shaped cross section, the engine 2 is mounted inside the hood 5 at a conventional position. It is possible to lower the position of the engine of the snow vehicle to the bottom side of the vehicle body, and as a result, it is possible to improve the steering stability when the snow vehicle 1 travels as in the above case.

Further, in the snowmobile of this embodiment, since the starter motor 3 is arranged on the side opposite to the exhaust manifold 23 with respect to the horizontal center line L of the crankcase 20, the high temperature emitted from the exhaust manifold 23 is high. It is possible to prevent the exhaust heat from affecting the starter motor 3, and as a result, the starter motor 3 can always be operated in a stable state.

Further, in the snow vehicle of this embodiment, as described above, the mounting position of the engine 2 inside the hood 5 can be lowered to the bottom side of the vehicle body as compared with the conventional case, so that the ground clearance of the hood 5 itself can be lowered. It becomes possible, and as a result, it becomes possible to improve the aerodynamic characteristics of the snowmobile.

Furthermore, in the snowmobile of this embodiment, since the small and highly rigid engine mount brackets 33 and 34 are used, the occurrence of resonance and the like can be prevented and the vibration of the engine 2 can be reduced. The weight reduction of the support mechanism for the main frame 32 of the engine 2 and the cost reduction can be achieved.

[0043]

As described above, according to the snowmobile of the present invention as set forth in claim 1, the starter motor is provided in the cylinder.
Near the center line, below the crankcase,
Position opposite to the cylinder erected on the top of the rank case
Due to the disposed location, with comparison with the case of arranging as in the conventional starter motor to the horizon or above than through the center of the crankcase, it is possible to take a weight balance of the engine and the starter motor It is possible to lower the center of gravity of the storage locations inside the snow vehicle such as the heavy load engine and starter motor, and as a result, it is possible to improve the steering stability when the snow vehicle is running. Play. Also , place the starter motor against the horizontal centerline of the crankcase.
Exhaust manifold attached to the cylinder
Since it is located on the opposite side of the cylinder, that is, at a location separated from the exhaust pipe attached to the cylinder, it is possible to prevent the problem that high temperature exhaust heat generated from the exhaust pipe affects the starter motor. The effect that the starter motor can always be operated in a stable state is achieved. In addition, the body frame is
Configured as a body frame with a space that can store
However, since the starter motor is arranged in the space of the vehicle body frame, the mounting position of the engine with respect to the vehicle body frame can be lowered to the vehicle body bottom side as compared with the conventional case.
As a result, there is an effect that it becomes possible to improve the steering stability when the snow vehicle travels. Moreover,
Since at least two loosening members for fixing the engine to the body frame are arranged above the place where the starter motor is arranged, the engine is supported at a higher position than the conventional position with respect to the body frame. As a result, the engine vibration transmitted to the vehicle body can be reduced.

According to the snow vehicle of the present invention as defined in claim 2, at least two cushioning members are substantially symmetrical with respect to the center of gravity of the engine , and the cushioning member on the front side of the engine is exhausted.
Between the sooth manifold and the starter motor,
Also, the cushion member on the rear side of the engine is an intake manifold.
Since it is arranged between the engine and the starter motor, it is possible to disperse the vibration generated from the engine through the cushioning member that is located substantially symmetrically with respect to the center of gravity of the engine.
As a result, it is possible to reduce the engine vibration transmitted to the vehicle body.

[0045]

[0046]

[0047]

[0048]

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration inside a hood of a snowmobile according to an embodiment of the present invention.

FIG. 2 is an explanatory view in which a part of a hood showing a general structure of a snowmobile in the present embodiment is cut away.

FIG. 3 is an explanatory diagram showing a positional relationship between an engine of a snowmobile and a starter motor in the present embodiment.

FIG. 4 is an explanatory view showing a snow vehicle in which a starter motor in a conventional example is arranged on a lower side of an exhaust manifold.

FIG. 5 is an explanatory view showing a snow vehicle in which another starter motor according to another conventional example is arranged on the lower side of the intake manifold.

[Explanation of symbols]

1 Snowmobile 2 engine 3 Starter motor 19,25 cylinders 20 crankcase 23 Exhaust manifold as an exhaust pipe 32 Main frame as body frame 35, 36 Engine mount rubber as cushioning member G1 car weight heart G2 engine center of gravity L Crankcase horizontal center line

Claims (2)

(57) [Claims] 1. An engine in which a cylinder is erected on an upper portion of a crankcase, and a starter motor for starting ,
Vehicle body through the engine through at least two cushioning members
In a snow vehicle fixed to a frame, the starter motor is arranged in a horizontal direction of the crankcase.
Exhaust attached to the cylinder with respect to the center line
Arranged on the opposite side of the manifold, and at least two of the above
The cushioning member above the starter motor
It is possible to store the starter motor in the vehicle body frame while placing it in one direction
The vehicle body frame having a large space,
A motor in the space of the body frame
And at about the centerline of the cylinder, the clan
A snow vehicle characterized by being arranged on the lower side of the case. 2. The at least two buffer members are substantially symmetrical with respect to the center of gravity of the engine , and the engine
The cushioning member on the front side of the
Between the starter motor and the rear side of the engine
The members are the intake manifold and the starter motor.
The snow-mounted vehicle according to claim 1, wherein the snow-mounted vehicle is arranged between the two .