JPH10217921A - Brake device for snowmobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a brake disk to improve the antifade property, and make a car body slim. SOLUTION: In this device, the pulley at the drive side of a V-belt type change gear is installed to the right end of a crankshaft provided to an engine, a gear box 41 is provided closely at the right side of a pulley 64 at the driven side of the V-belt type change gear, and its input shaft 68 is made common with the driven shaft of the driven side pulley 64. The gear box 41 is extended in the up and down direction, a gear train with three shafts in series which consists of an input gear 65, an idle gear 66, and a final gear 67, is housed at the inner side of the gear box 41, one end of an idle shaft 69 is extended out of the gear box 41, and the boss 98 of a brake disk 70 is fitted around this extension 96, so as to make movable in the axial direction by a spline connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a snowmobile having a steering ski supported at a front portion of a vehicle body and an endless track device supported at a rear portion of the vehicle body.

[Prior art]

[0002] Japanese Patent Publication No. 50-39291 discloses that an endless track device is driven by transmitting a driving force of an engine to a drive shaft of the endless track device via a V-belt type transmission and a chain transmission type final reduction gear. A snowmobile is shown, and a brake disk is supported near the chain case on a connection shaft connecting the driven side of the V-belt type transmission and the input side of the chain case.

[0003]

The above-described conventional chain case has a two-axis configuration of an input shaft and a final shaft. If a brake disk is provided on the input shaft, the input shaft becomes longer. Since the weight is inevitably increased and the installation space for the installation is required to be large, a structure capable of reducing the weight and reducing the installation space is desired.

In addition, since the input shaft has a relatively high number of revolutions, if a brake disk is provided here, the amount of heat generated during braking increases, so that improvement in fade resistance is desired.

Further, if the brake disk is provided on the input shaft located above the chain case, the center of gravity of the vehicle body will be increased. Conversely, if provided on the final shaft, it becomes difficult to narrow down the lower part of the vehicle body, so that it is difficult to secure a sufficient bank angle. Therefore, a brake device that has a low center of gravity and a slim body is also desired.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to a steering ski supported at the front of a vehicle body, an endless track device suspended at the rear of the vehicle body, and a steering ski and an endless track device. A snowmobile that drives the endless track device by transmitting a driving force of the engine to a drive shaft of the endless track device via a V-belt type transmission and a final reduction gear. Wherein the final reduction gear is a gearbox including a gear train having an input gear connected to the driven side of a V-belt type transmission, an idle gear, and a final gear connected to a drive shaft of the endless track device. And a brake disk is supported on an idle shaft of the idle gear.

At this time, the gear box may be arranged offset to the side of the vehicle body, and the brake disk may be arranged outside the gear box.

Further, one of the pads of the brake disk may be supported on a gear box, and this brake disk may be spline-coupled to an idle shaft so as to be movable in the axial direction.

[0009]

Since the brake disk is mounted on the idle shaft of the gear box, the input shaft can be made as short as possible, and as a result, the gear box can be made compact and lightweight.

Further, by mounting the brake disk not on the input shaft having a relatively high rotation speed but on the idle shaft having a relatively low rotation speed, the amount of heat generated during braking can be reduced, and as a result, fade resistance can be reduced. Also suits.

Further, by offsetting the vertically extending gear box to the side of the vehicle body and mounting the brake disk to an idle shaft lower than the input shaft, the center of gravity of the vehicle body can be lowered and the position above the drive shaft can be reduced. Therefore, it is easy to narrow down the lower part of the vehicle body, and a sufficient bank angle can be secured.

Further, one of the pads of the brake disk is supported on a gear box, and if this brake disk is spline-coupled to an idle shaft, the brake disk becomes axially movable. Therefore, the brake caliper is integrally formed on the gear box. In addition, the brake disc can follow the change due to the wear of the pad. Therefore, the brake caliper can be integrally formed, and the assembly and the detachability are excellent.

[0013]

FIG. 1 is a side view of a snow vehicle, FIG. 2 is a side view of the snow vehicle without a body cover, FIG. 3 is a schematic plan development view of a drive and power transmission system, and FIG. FIG. 5 is a right side view of the drive and power transmission system,
6 is a plan sectional view of the engine part, FIG. 7 is a sectional view of the driven pulley and the final reduction gear part, FIG. 8 is a view showing a drive shaft support structure of the endless track device, and FIG. 9 is a sectional view of the brake device part. is there.

First, a schematic structure of the entire snowmobile will be described with reference to FIGS. A steering ski 1 is supported via a telescopic upright type front suspension 2 at the front of the vehicle body of the snowmobile, and an endless track device 3 is provided at the rear of the vehicle body.
Is provided, and is driven by an engine described later.

A floor 4 is provided above the endless track device 3, and the occupant stands on the floor 4 and operates the handle 5. The floor 4 is a member having a substantially inverted U-shaped cross section, and the left and right side surfaces thereof have a standing wall shape.

The body cover 6 for covering the vehicle body, a front cover 7 that covers the vehicle body front of the engine room above the front to the rear, along a side cover 8 and the side cover 8 to cover the both side portions on the left and right sides of the floor 4 And a rear cover 9 extending long and rearward and surrounding the side of the occupant space on the floor 4.

As shown in FIG. 2 , an inner tube 11 of a front suspension 2 having a periphery fixed to a head pipe 10 is disposed obliquely in the vertical direction at a front portion of the vehicle body, and a lower end thereof is provided with an outer tube 12. Is rotatably supported with respect to.

On the outer periphery of the upper end of the inner tube 11,
A handle boss 13 is attached to the inner tube 11 as a pivot axis so as to be rotatable and non-movable in the axial direction. A suspension link 14 connects the handle boss 13 to the upper end of the outer tube 12.

The suspension link 14 is expanded and contracted by the vertical movement of the outer tube 12, and the intermediate portion is bent forward so as to protrude, so that a chamber space described below is formed in a space surrounded by the vehicle body cover 6 in front of the head pipe 10. A sufficient amount is secured.

The lower end of the handle post 15 is connected to the top of the handle boss 13 via a handle post pivot 16 so as to be vertically swingable.
A handle link 18 composed of a damper is mounted between a link stay 17 that extends obliquely upward from the top of 3 and extends integrally rearward and a portion of the handle post 15 near the handle 5.

The front suspension 2, the head pipe 10 and the handle boss 13 form a steering axis of the steering ski 1, and the position of the handle post pivot 16 is determined by the rear end of the steering ski 1 and the endless track device 3. It is located in the middle of the front end.

A pair of left and right main frames 20 extending obliquely downward and rearward from the head pipe 10 are provided with a down tube 21 extending downward from the vicinity of the head pipe 10 and a pivot plate 22 also extending downward from the rear. I have.

The engine mounts 2 provided on the down tube 21 and the pivot plate 22, respectively.
Water-cooled two-cycle single-cylinder engine 25 via 3, 24
The cylinder portion 26 is located between the left and right main frames 20, and the center of the engine 25 is located substantially on the center of the vehicle body.

The crankcase 2 constituting the engine 25
A water pump 28 and an oil pump 29 are provided at a lower portion of the cooling water 7, and the water pump 28 supplies cooling water from the heat exchanger 30 housed inside the ceiling of the floor 4 to the cylinder 26.

The cooling water from the cylinder 26 is supplied to the heat exchanger 3
After being sent to 0 and cooled efficiently, it is returned to the water pump 28. Note that a heat exchanger 30 is provided beside the head pipe 10.
Are provided.

The heat exchanger 30 has a large surface area by making the width substantially the same as the left and right width of the ceiling of the floor 4 and also serves to increase the mutual rigidity by overlapping the ceiling with the ceiling of the floor 4 in the vertical direction. ing.

The oil pump 29 is connected to an oil tank 33 supported on the front of the floor 4 together with a battery 32. The battery 32 and the oil tank 33 move back and forth between the occupant space on the floor 4 and the front engine room. The lid 34 formed on the partitioning wall 7a is opened for maintenance.

The partition wall 7a is formed by a part where the front cover 7 covers the upper surface of the fuel tank 35 and goes around to the rear. The fuel tank 35 is located on the front side of the battery 32 and the oil tank 33 and is located on the main frame 20. Supported up. Reference numeral 36 denotes a tank cap.

An exhaust chamber 37 extends forward from an exhaust port of the engine 25, and passes through a chamber space, which is a space surrounded by the vehicle body cover 6 in front of the engine 25.
The silencer 38 is disposed along the inner surface of the vehicle body cover 6 so as to form a substantially semicircular shape in plan view, and the silencer 38 connected to the exhaust chamber 37 is disposed along the upper side of the exhaust chamber 37 so that the second floor is substantially formed. The exhaust gas is exhausted downward from the tail pipe 39 to the front of the engine 25 finally while forming an exhaust system piping meandering in a building shape.

The drive output of the engine 25 is transmitted via a V-belt type transmission 40 to a gear box 41 in which a final reduction mechanism is accommodated. The gear box 41 is attached to and supported by the main frame 20 and the pivot plate 22, and rotates the drive shaft 42 after the final reduction of the driving force transmitted from the V-belt type transmission 40. Has become.

The drive shaft 42 includes a drive wheel 4
2a is supported so as to be integrally rotatable.
“a” drives the track belt 43 by engaging with irregularities formed on the inner surface of the track belt 43 at the outer peripheral portion.

The both ends of the drive shaft 42 are supported by the pivot plate 22 on the left side and the gear box 41 on the right side. It is rotatably supported.

Each rear end of the rear arm 44 is connected to a front end of a side rail 47 extending in the front-rear direction parallel to the left and right via an idle shaft 46 of an idle wheel 45.

Each rear end of the side rail 47 supports a shaft position adjusting plate 50 on which an idle shaft 49 of an idle wheel 48 is supported so as to be movable back and forth.
The lower end of a rear link 51 parallel to the rear arm 44 is connected to the shaft position adjusting plate 50 by a connecting member 51a.

The upper end of the rear link 51 is attached to a stay 52 projecting downward from the side surface of the floor 4 via an idle shaft 53, and an idle wheel 54 and another idle wheel 46 supported by the idle shaft 53. , 48
In addition, the track belt 43 is wound around the drive wheel 42a on the drive shaft 42, so that the endless
Is configured.

The endless track device 3 forms a parallelogram link comprising a floor 4, a rear arm 44, a side rail 47 and a rear link 51, and the left and right side rails 47.
A rear suspension is constituted by a damper 56 and a suspension spring 57 which are arranged so as to extend obliquely vertically in a substantially inverted C-shape when viewed from the side from a cross plate 55 formed in an intermediate portion of the rear suspension.

The upper end of the damper 56 is supported by a cross pipe 58 supported between the left and right extending portions 22a extending rearward in the floor 4 integrally from the rear of the pivot plate 22, and the upper end of a suspension spring 57. The spring holder 59 is rotatably supported on the idle shaft 53.
The spring holder 59 is also supported at the rear end of a spring holder rod 59a extending rearward with its front end fastened together with the upper end of the damper 56.

Next, the detailed structure of the drive and power transmission system will be described with reference to FIGS. The drive and power transmission system includes an engine 25, a V-belt type transmission 40, and a gear box 41, which are disposed so as to form a substantially N-shape (see FIG. 5). Further, as apparent from FIG. 4, the engine 25 is a pre-compression in-crankcase two-stroke engine that draws air from the carburetor 19 into the crankcase 27.

As shown in FIG. 3, a crankshaft 60 of the engine 25 has an AC drive at one end.
G61 is attached, and the other end is extended to the outside of the crankcase 27, and a drive-side pulley 62 constituting the known V-belt type transmission 40 is attached to the extension.

The V-belt type transmission 40 includes a V-belt 63
Are wound around a drive-side pulley 62 and a driven-side pulley 64 disposed behind and above the drive-side pulley 62 (see FIGS. 3 and 5).
), And the rotational output of the crankshaft 60 is transmitted to the gear box 41 side through a stepless primary shift.

The arrangement of the driving and power transmission system components is such that the gear box 41 is disposed on the right outside of the main frame 20 in the vehicle width direction with respect to the drive pulley 62 of the V-belt type transmission 40. On the other hand, the engine 25 and the V-belt type transmission 40 are disposed inside the left and right main frames 20, and the V-belt type transmission 40 is interposed between the gear box 41 and the engine 25.

The gear box 41 has left and right halves 41a and 4
1b, and an input gear 65 therein.
An input shaft 68 to which an input gear 65 is attached extends to the outside of the gear box 41 and accommodates a gear train in the form of a three-axis series consisting of an idle gear 66 and a final gear 67. 64 are attached.

The idle shaft 69 to which the idle gear 66 is attached extends to the outside of the gear box 41 on the side opposite to the input shaft 68, and a brake disk 70 is attached thereto. This brake disk 70 is
Is braked by a brake caliper 70a (see FIG. 5) provided in the half case 41b.

The final shaft 71 to which the final gear 67 is attached is a hollow shaft.
One end of 2 is detachably fitted. Gear box 4
The inside of 1 is filled with lubricating oil for oil immersion of the gear train.

As shown in FIG. 6, a starter driven gear 73 is supported on the crankshaft 60 of the engine 25 in the vicinity of the ACG 61 via a one-way clutch 72, and the movement in the thrust direction is regulated by the gear pressing plate 74.

Further, a nut 75 is provided on the crankshaft 60.
A balancer drive gear 76 is provided, which is engaged with the balancer driven gear 77, so that the balancer shaft 7 disposed parallel to the crankshaft 60 is provided.
8 is driven to rotate.

A pump driving gear 80 is attached to one end of the balancer shaft 78 by a bolt 79, and a balancer weight 81 is integrally provided at the other end. Balancer shaft 78
The balancer driven gear 77 and the balancer weight 81 near each other are supported by bearings 82 and 83 on the crankcase 27 at the intermediate portion thereof, and the balancer weight 81
A seal 84 is provided outside the bearing 83 on the side.

The balancer chamber 85 for accommodating the balancer shaft 78
Is a crank chamber 86 accommodating the crank weight 60a.
And the balance wall driven journal 77 and the balancer driven gear 77 and the balancer weight 81 are respectively formed in the crank chamber 86.
And the inside of the balancer chamber 85 is filled with the lubricating oil in the crankcase 27, the bearings 82 and 83 are arranged in the oil, and the sealer 84 seals the rebalancer chamber 85 to the outside. Have been.

The crankshaft 60 is also a crank weight 60a.
Near the journal wall 87 by a bearing 88, and a seal 89
a, 89b.

As is apparent from FIG.
The input shaft 68 is supported by bearings 90 and 91 and is driven from the gear box 41 by the driven pulley 64.
A seal 92 is provided in a portion extending to the side.

Similarly, the idle shaft 69 has a bearing 9
3 and 94, a seal 9 extends from the gear box 41 to the brake disk 70 side.
5 are provided.

The spline groove 9 is provided on the outer periphery of the extension 96.
7, a boss 98 fitted on the outer periphery of the extension 96 is provided at the center of the brake disk 70, and a spline groove 99 formed on the inner peripheral surface of the boss 98 is engaged with the boss 98. The combination makes it possible to move in the axial direction.

The side cover 8, which is shown by an imaginary line in the figure and which is the exterior of the vehicle body, protrudes to the side in the vicinity of the boss 98 of the brake disk 70 and forms the largest part of the vehicle width. The part is greatly narrowed down to the center of the vehicle.

Further, the final shaft 71 is similarly supported by bearings 100 and 101, and the final shaft 71 is a hollow shaft. One end 102 is open to one side of the gear box 41, and Is provided with a seal 103. A spline groove 104 is formed on the inner surface of the one end 102 from the open end side.

One end 105 of the drive shaft 42 is fitted to the one end 102, and the spline groove 106 formed on the outer periphery of the one end 105 is engaged with the one end 105, whereby the final shaft 71 and the drive shaft 42 are connected. It becomes integrally rotatable, and is sealed by fitting a cap 108 to the other end 107 of the final shaft 71.

As is apparent from FIG. 8, both ends of the drive shaft 42 are supported by passing through bearings 110 provided at the front ends of the left and right rear arms 44, and the other end opposite to the one end 105 has the other end. A small diameter portion 111 is formed. Here, the small diameter portion 111 is supported by a bearing 112 supported by the pivot plate 22.
And is fastened to the bearing 112 by a nut 114.

The outer periphery of the intermediate portion of the drive shaft 42 is
5, which is the boss 11 of the drive wheel 42a.
The drive wheel 42a can rotate integrally with the drive shaft 42 by engaging with a hexagonal hole 117 formed at the center of the drive shaft 42.

FIG. 9 shows details of the brake device.
Fig. 9 is a cross-sectional view of the brake device taken along a line 9-9 corresponding to
One brake caliper 70a is integrally formed in advance with the half case 41b of the gear box 41, and the other removable caliper 120 is attached to the brake caliper 120 by bolts 121 with the brake disc 70 interposed therebetween.

A pot 122 is formed in a concave shape in the detachable brake caliper 120, and a back plate 123 having a pad 124 on its surface is provided with a brake disk 7.
0 is slidably fitted in the vertical direction.

A backup rate 125 is brought into contact with the back surface of the back plate 123, and an adjustment bolt 126
Accordingly, the initial projection amount of the pad 124 projecting toward the brake disk 70 is adjusted.

The adjustment bolt 126 is a lock nut 1
The lock nut 127 is fixed to the adjustment position at 27 and the lock nut 127 is integrated with the feed mechanism 128. The feed mechanism 128 is formed by worm teeth 129 formed around the inner surface of the through hole 130 provided on the detachable brake caliper 120 side. Meshes with the worm teeth formed on

A brake arm 131 is attached to the outer periphery of the upper end of the feed mechanism 128. When the brake arm 131 is pulled by a brake cable 132 during braking, the feed mechanism 128 rotates and advances toward the brake disk 70, and the pad 12
4 is pushed out and strongly slidably brought into contact with the side surface of the brake disk 70 to perform braking.

A ring-shaped guide groove 133 is also formed in the brake caliper 70a, and a cup 134 is slidably fitted therein, and a pad 135 is supported on the surface thereof.

Next, the operation of the present embodiment will be described. As can be seen in FIGS.
Was attached to the idle shaft 69 of the gear box 41,
The input shaft 68 can be made as short as possible, and as a result, the gearbox 41 can be made compact and lightweight.

By mounting the brake disk 70 not on the input shaft 68 having a relatively high rotation speed but on the idle shaft 69 having a relatively low rotation speed, the amount of heat generated during braking can be reduced. Fade resistance is also improved.

Further, the gear box 4 extending in the vertical direction
1 is offset to the side of the vehicle body, and the brake disk 70 is mounted on the idle shaft 69 which is lower than the input shaft 68, so that the center of gravity of the vehicle body can be lowered. Can be narrowed down easily, and the bank angle can be sufficiently secured.

In addition, the brake disk 70 merely fits the boss 98 to the extension 96 of the idle shaft 69 so as to be movable in the axial direction.
At the zero side, the pads 124 and 135
If the adjustment bolt 126 is pushed in at the time of thickness adjustment due to the wear of the brake pad, the pad 124 is pushed out and the brake disk 70 is pushed out at the same time.

Therefore, even if the brake caliper 120 is integrally formed on the gear box 41, the brake disc 70 can follow the change due to the wear of the pad 124.
20 and can be constructed integrally with each other, and can be easily assembled and removed.

Therefore, the attachment / detachment of the brake disk 70 is facilitated and the maintainability is remarkably improved. Moreover, the brake caliper 70a is connected to the gearbox 4
Since it is formed integrally with the case half 41b, the number of parts can be reduced and the structure can be simplified.

[Brief description of the drawings]

Fig. 1 Side view of a snow vehicle

FIG. 2 is a side view without a snow vehicle body cover.

FIG. 3 is a schematic plan development view of a drive and power transmission system.

FIG. 4 is a left side view of the drive and power transmission system.

FIG. 5 is a right side view of the drive and power transmission system.

FIG. 6 is a plan sectional view of an engine part.

FIG. 7 is a sectional view of a driven pulley and a final reduction gear portion.

FIG. 8 is a sectional view showing a drive shaft support structure.

9 is a cross-sectional view of the brake device at a portion corresponding to line 9-9 in FIG.

[Explanation of symbols]

1: steering ski, 2: front suspension, 3: endless track device, 4: floor, 25: engine, 40: V-belt type transmission, 41: gear box, 62: drive side pulley, 64: driven side pulley, 66: idle gear, 68: input shaft, 69: idle shaft, 70: brake disk, 70a: brake caliper, 120: detachable brake caliper

Claims (3)

[Claims] 1. A steering ski supported at a front portion of a vehicle body, an endless track device suspended at a rear portion of the vehicle body, and an engine supported by the vehicle body between the steering ski and the endless track device. In a snowmobile that drives the endless track device by transmitting the driving force of the engine to the drive shaft of the endless track device via a V-belt type transmission and a final speed reducer, the final speed reducer is connected to the V-belt type transmission. The gearbox includes a gear train having an input gear connected to the driven side, an idle gear, and a final gear connected to the drive shaft of the endless track device, and a brake disk is provided on the idle shaft of the idle gear. A snowmobile brake device characterized by being supported. 2. A snowmobile braking apparatus according to claim 1, wherein said gear box is arranged so as to be offset to the side of the vehicle body, and said brake disk is provided outside said gear box. . 3. A snowmobile according to claim 2, wherein one of the pads of the brake disk is supported on a gear box, and the brake disk is spline-coupled to an idle shaft so as to be movable in the axial direction. Brake equipment.