JPH02274682A - Snow mobile track belt - Google Patents

Abstract

PURPOSE:To reinforce the tip part of a traction protrusion so as to improve tractive force and reduce the sliding frictional resistance of a flat sliding part so as to improve durability by constraining the positional relation between the traction protrusion tip part and the lateral rigid member of a track belt into a specified position. CONSTITUTION:A traction protrusion tip 10a is set within the project area S of a lateral rigid member as well as within the range of 0 deg.-theta/2 deg. against a perpendicular on the peripheral plane of a track belt 6, where theta deg. is the angle of the front end of the track belt 6 to the snow contact face G at the time of the traction protrusion 10 intruding into the snow contact face G at the front end, in the advancing direction, of the track belt 6. The slidable part 5a of the track belt 6 against a suspension rail 5 is formed in such a way that the traction protrusion tip 10a is positioned within the project region of the lateral rigid member 1 on a perpendicular headed for the lateral rigid member 11 from the peripheral plane of the track belt 6. The reaction P is thereby generated in the direction of the lateral rigid member at the time of intruding into the snow contact face, as well as the generation of moment by the reaction P is prevented at the flat sliding part.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a track belt for a snowmobile,
More specifically, the present invention relates to a track belt for a snowmobile in which the rigidity of the tip of the traction protrusion is increased to improve the traction force and the durability of the driving sliding portion of the track belt is improved.

[Prior Art] Conventionally, as shown in FIGS. 5 to 8, in this type of snowmobile and track belt for snowmobile, skis 2 are attached to the lower part of the tip side of the snowmobile 1, and a drive wheel is attached to the lower part of the rear part of the snowmobile 1. An endless track heald 6 is provided which is wrapped around the idler wheel 3 and the idler wheel 4 and slides along the → suspension rail 5.

As shown in the partially cutaway perspective view of FIG. 6, the structure of the track belt 6 includes reinforcing fabrics 8a and 8b arranged on the upper and lower surfaces of the central core 7, and further on the front and back surfaces of the central core 7. The cover rubber 9a and 9b are coated on the cover rubber 9a and 9b.

A track held 6 is attached to the cover rubber 9a on the front side.
Traction protrusions 10 are formed at predetermined intervals in the width direction, and a lateral rigid member 11 is embedded along the traction protrusions 10 inside the center of the traction protrusions 10 . Further, a drive protrusion 12 is formed on the cover rubber 9b on the back side.

By the way, in order to obtain effective traction force, the traction protrusion 10 of the track belt 6 has a substantially triangular cross-sectional shape as shown in FIGS. Soft rubber is generally used to reduce collisions with hard obstacles on the road.

Further, as described above, the horizontally rigid member 1 is embedded in the component of the traction projection 10 and the belt main body portion 1a, and this lateral rigidity member 11 is located at the starting point of the traction projection IO and the heald main body portion. It is located approximately in the center of the

[Problem that the invention seeks to solve]

However, in a configuration in which the lateral rigid member 11 is located approximately at the center of the starting point between the traction projection 10 and the belt main body portion 1a, especially when the traction projection 10 on the front end side of the track belt 6 penetrates the snow surface, The reaction force P deforms the traction protrusion 10 in the part of the lateral rigid member 11 that is not buried, making it difficult to penetrate the snow contact surface, and even if it does penetrate, the penetration is shallow, making it impossible to obtain the original traction force. There was a problem.

In addition, there is a problem in that an uneven load is applied to the sliding portion with respect to the suspension rail 5, which reduces the wear of the sliding portion.

[Purpose of the invention]

This invention was devised by focusing on such conventional problems, and by restricting the positional relationship between the tip of the traction protrusion and the horizontal rigid member to a predetermined position, the tip of the traction protrusion is reinforced and the traction force is reduced. This is a l-for snowmobile that has improved durability by reducing the sliding friction resistance of the flat sliding part.
The purpose is to provide a rack held.

(Means for Solving the Problems) This invention provides 1. In order to achieve the above object, the tip of the traction protrusion of the track held is within the projection area of the horizontal rigid member embedded in the traction protrusion, and the traction protrusion is located on the track. When penetrating the snow contact surface at the front end of the belt in the traveling direction, if the approach angle is the angle between the snowmobile surface set in the design of the snowmobile and the front end of the track belt as θ0, then the outer peripheral plane of the track belt set in the range of 0'' to θ/2'' with respect to the perpendicular line in The gist is that the tip of the traction projection is positioned.

(Function of the invention) This invention is configured as described above, and when the tip of the traction projection penetrates the snow contact surface, by embedding a lateral rigid member in the direction of the reaction force of the snow surface, the traction The protrusions are reinforced, minimizing deformation when penetrating the snow-contact surface, allowing greater traction force to be obtained, and in the plane sliding part with the suspension rail, the surface pressure on the sliding surface is evened out. It is characterized by being able to reduce sliding resistance and improve durability.

[Principle of the Invention] Before explaining the invention in detail, the principle of the invention will be explained with reference to FIGS. 1 and 2.

Note that the same components as those in the conventional example are given the same reference numerals, and the description thereof will be omitted.

As shown in FIG.
However, the trajectory of the tip 10a of the traction protrusion 10 when it penetrates the snow contact surface G at the front end of the suspension rail 5 is the snow contact path, assuming that the angle between the snow contact surface G and the front end of the track heald 6 is θ°. It penetrates at an angle of θ/2° with respect to the perpendicular line XX of plane G.

That is, as shown in the schematic diagram of FIG.
The pattern at point A in a is (Ii
'i Drive a long distance on the slope. At this time, assuming that there is no slip between the track heald 6 and the snow contact surface G, the point A of the traction protrusion tip 10a will advance by the distance.

That is, point A moves from A to 0 with respect to the snowmobile 1, but moves from A to Z with respect to the snow contact surface G. Therefore, ΔAOZ becomes an isosceles triangle, and /AZ○ becomes (9
0°-θ/2)°, and the angle between the perpendicular Q-Q from point A and side AZ is θ/2°.

[Embodiments of the Invention] Next, the present invention will be described in detail based on FIGS. 3 and 4.

FIG. 3 shows a cross-sectional view of the traction projection IO located on the front end side in the traveling direction of the track heald 6, and a lateral rigid member 11 is embedded in a component of the traction projection 10 and the heald main body portion 1a.

The positional relationship between the traction projection tip 10a and the horizontal rigid member 11 is determined based on the principle of the invention described above.
within the projection biS of the transversely rigid member Il, and within the traction projection 1
0 is the snow contact surface G at the front end of the track belt 6 in the traveling direction
When penetrating into the snow, if the angle between the snow contact surface and the front end of the track belt 6 is θ°, set it in the range of 0° to θ/2° with respect to the perpendicular to the outer circumferential plane of the track belt 6. .

In addition, at the sliding portion 5a of the track belt 6 with the suspension rail 5, as shown in FIG. , the tip 10a of the traction protrusion is positioned. By positioning the tip 10'a of the traction protrusion within the range of the above conditions, when the tip 10a of the traction protrusion 10 penetrates the snow contact surface, the lateral rigidity is increased in the direction of the reaction force of the snow contact surface G. Member 11
is buried, the tip 10 of the traction projection 10
a is reinforced and deformation when penetrating into the snow contact surface G can be minimized, resulting in greater traction force. In addition, in the planar sliding portion with the suspension rail 5, the reaction force P in the vehicle weight direction of the snow surface generated at the tip 10a of the traction projection does not generate a moment, so the metal fitting 13
This makes it possible to equalize the surface pressure on the sliding surface 5a, thereby reducing sliding resistance and improving durability. Further, the same effect can be obtained since the moment due to the reaction force F in the driving direction of the snow surface can be minimized.

Note that the shape of the traction protrusion IO configured as described above is necessarily asymmetrical with respect to the center in the cross-sectional width direction,
In addition, on the outer periphery of the traction protrusion IO, at equal pitches like in the past,
It is also possible to provide linear protrusions (not shown) extending in the width direction of the track belt 6 to increase friction with the snow surface and increase traction force.

〔Effect of the invention〕

As described above, the present invention allows the tip of the traction protrusion located on the front end side in the traveling direction of the track belt to penetrate into the snow contact surface within the projection area of the lateral rigid member embedded in the traction protrusion and at the track heald. When the angle between the snow contact surface and the front end of the track belt is θ°, the angle between the snow contact surface and the front end of the track belt is set in the range of 0° to θ/2° with respect to the perpendicular to the outer circumferential plane of the trunk belt, and Since the tip of the traction protrusion is positioned within the projection area of the horizontal rigid member of the perpendicular line from the outer circumferential plane of the track belt toward the horizontal rigid member in the sliding portion, the following excellent effects can be achieved. .

(a) When the tip of the traction protrusion penetrates the snow contact surface, a lateral rigid member is buried in the direction of the reaction force of the snow surface, so the traction protrusion is reinforced and penetrates the snow contact surface. The deformation during the process can be minimized, and as a result, greater traction force can be obtained.

(b) In the planar sliding part with the suspension rail, the reaction force of the snow contact surface generated at the tip of the traction projection does not generate a moment, so the surface pressure on the sliding surface becomes equal, reducing sliding resistance. and durability can be improved.

(C) Since the moment generated by the driving reaction force of the contact surface that the tip of the traction projection receives can be minimized, the traction projection does not escape, a large traction force is obtained, and the belt body is prevented from deforming, resulting in the belt body can reduce bending fatigue.

(d), the above (a) without any change in the structural members;
) to (C) can be achieved.

(e) It is possible to increase the friction with the snow-contacting surface by providing linear protrusions on the outer peripheral surface of the traction protrusion at equal pitches and extending in the width direction of the track belt, thereby increasing the traction force.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams and schematic diagrams for explaining the present invention in detail, FIG. 3 is a cross-sectional view of the tip of the traction protrusion on the front end side of the track belt showing an embodiment of the present invention, and FIG. The figure is a cross-sectional view of the sliding part between the suspension rail and the traction protrusion, Figure 5 is a side view of a conventional snowmobile, Figure 6 is a partially cutaway perspective view of a conventional track belt, Figures 7 and FIG. 8 is an explanatory diagram showing the relationship between the tip of a conventional traction projection and a lateral rigid member. ■... Snowmobile, 5... Suspension rail, 5a... Sliding part, 6... Track belt, 10...
... Traction protrusion, 10a... Traction protrusion tip, 11...
Lateral rigid member, G... Snow contact surface, S, K... Projection area. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Scope of Claims] 1. An endless track belt for a snowmobile in which traction protrusions in which horizontally rigid members are embedded are arranged on the snow contact surface side at predetermined intervals in a direction perpendicular to the track direction, When the tip of the traction projection located on the front end side of the belt in the traveling direction is within the projection area of the horizontal rigid member embedded in the traction projection, and when the traction projection penetrates the snow contact surface at the front end of the track belt in the traveling direction, the snow contact surface If the angle formed between
A track belt for a snowmobile, characterized in that the tip of the traction protrusion is located within a projected area of the horizontal rigid member of a perpendicular line from the outer circumferential plane of the track belt toward the horizontal rigid member in the sliding portion of the track belt. 2. The track belt for a snowmobile according to claim 1, wherein linear protrusions are provided on the outer peripheral surface of the traction protrusion at equal pitches and extend in the width direction of the track belt. 3. The track belt for a snowmobile according to claim 1, wherein the traction protrusion is formed asymmetrically with respect to the center in the cross-sectional width direction.