JPH03189288A - Caterpillar type vehicle - Google Patents

Abstract

PURPOSE:To facilitate adjusting work by providing an adjuster on a rear fork side for adjusting tension of a stopper belt to control elongation of a rear sub- cushion concerning a caterpillar type drive device. CONSTITUTION:In a vehicle in which a ski is provided on the lower end of a front fork in one body with a handle and a rear fork 5 pivotally fitted to the rear part of a frame 3 is provided with a caterpillar type drive device 10, the axle 11 of the driving wheel 13 of the drive device 10 is movably in front and rear supported on the rear end part of the rear fork 5, and the front end part of a rear arm 12 is fluctuatably supported around the axle 11. A rear sub-cushion 17 and a stopper belt 18 to control elongation of the cushion 17 are mounted between the rear fork 5 and the rear arm 12. In this case, tension of the stopper belt 18 can be adjusted by rotational movement of the eccentric cam roller 24b of an adjuster 24 provided on the rear fork 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tracked vehicle suitable for driving on snow, etc., in which skis are provided at the front of the frame so as to be steerable, and skis are pivotally mounted at the rear of the frame. This invention relates to a track-type drive device that is swingably connected to a rear fork, and that drives the drive device with power via a drive chain.

[Prior Art] A tracked vehicle having such a structure has already been proposed by the present applicant (for example, Japanese Patent Application No. 1-173688). The front end of the rear arm that rotatably supports the drive wheel and guide wheel is pivotally connected to the rear end of the rear fork via the axle of the drive wheel. It spans a rear sub-cushion for cushioning and a stopper belt to restrict the extension plate to a certain range.

The presence of this stopper belt prevents the rear end of the drive device from sinking into the snow, thereby improving the stacking resistance.

[Problems to be Solved by the Invention] Incidentally, in the tracked vehicle having the above structure, the axle position may be moved in the front-rear direction in order to adjust the tension of the drive chain. At this time, since the rear arm also moves relative to the rear fork together with the axle, the tension of the stopper belt changes, and the regulation value for the amount of extension of the rear subcushion also changes. Therefore, it is desirable to be able to adjust the tension of the stopper belt as the axle position moves. It is also desirable that the adjustment mechanism (adjuster) be installed with consideration so that it can contribute to maintaining good road followability of the drive device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tracked vehicle that solves these problems.

[Means for Solving the Problems] In order to solve the above problems, a tracked vehicle according to the present invention includes a drive wheel that is powered by a drive chain, an axle of the drive wheel supported at a front end, and a drive wheel. A drive device having a longitudinally long rear arm that rotatably supports a guide wheel at a position rearward of the wheel, an endless belt-shaped drive belt that is wound around the drive wheel and the guide wheel and meshes with the drive wheel, and a drive device that is attached to the front part of the frame. It is equipped with skis that can be steered freely, a rear fork that is pivotally attached to the rear of the frame, and the axle of the drive wheel is supported so that it can move forward and backward to the rear end of the rear fork. The front end of the rear arm is swingably connected to the rear end of the rear fork, and between the rear fork and the rear arm there is a rear sub-cushion for cushioning the swing of the rear arm, and the amount of extension of this rear sub-cushion is restricted. In the stopper belt for use in the vehicle, an adjuster for adjusting the tension of the stopper belt is attached to the rear fork side.

[Operation of the Invention] The stopper belt according to the tracked vehicle of the present invention is provided with an adjuster for adjusting the tension thereof. Therefore, when the axle is moved to adjust the tension of the drive chain, even if the relative position of the rear fork and rear arm changes as the axle moves, the tension of the stopper belt can be adjusted by operating the adjuster. Adjusted to remain constant. Therefore, the regulation value for the amount of elongation of the rear subcushion is constant, and the stacking resistance etc. are maintained satisfactorily. Further, since the adjuster is attached to the rear fork side, an increase in weight on the rear arm side is prevented even if the adjuster is provided, so that the road followability of the rear arm and the entire drive device is maintained well.

[Embodiment] FIGS. 1 to 11 are diagrams relating to a snow bite that is an embodiment of the present invention, which is assembled by reusing the body of a two-wheeled motor vehicle as it is. Figure 1 shows the side shape of the vehicle body frame, where l is the ski, 2 is the front fork, 3 is the frame, 4 is the engine, 5 is the rear fork, 6.7 is the drive chain, 8 is the intermediate sprocket, and 9 is the frame. The driven sprocket, lO, is the driving device. The drive device 10 is rotatably supported by a rear arm 12 which is pivotably pivoted at the front end of the rear fork 5 by an axle 11, a drive wheel 13 coaxially supported by the axle 11, and the rear arm 12. Guide wheels 14, these drive wheels 13 and guide wheels 14
A drive belt 1 forming an endless band orbit wound around the
Consists of 5th grade.

Further, an extending portion 16 is formed at the front upper part of the rear arm 12, and one end portion of each of a rear sub-cushion 17 and a stopper belt 18 is attached to the extending portion 16.

FIG. 2 is a diagram mainly showing the planar shape of the drive device 10, with the drive belt 15 and other parts cut away.
It is a bolt-shaped member placed across the It is fastened at one end with a nut lla. Bins 13a protruding outward are provided at equal intervals on both sides of the drive wheel 13.
The drive belt 15 engages with a horizontal lug 15a formed on the inner circumferential surface side to extend in the vehicle width direction, and the drive chain 6.
The power of the engine 4 transmitted to the drive wheels 13 via the belt 7 is transmitted to the drive belt 15, so that it can be rotationally driven.

Of the pair of left and right arms that make up the rear fork 5,
A right bracket 2o is attached to the right arm 5r, a left bracket 3o is attached to the left arm 5ρ, and a stopper belt 18 is attached to the right bracket 2o, and a left bracket 3o is attached to the right bracket 2o.
o has rear sub cushion 17 and stopper belt 18
are installed respectively. In addition, the left and right arms are 5℃
, 5r is provided with an elongated hole 19a for supporting the axle 11 so as to be movable in the front-rear direction, and both ends of the axle 11 passing through each elongated hole 19a are connected to the rear end of each arm. It passes through the two-pronged chain adjuster 19b that holds the chain adjuster 19b. By rotating the adjustment nut 19c, the chain adjuster 19b moves forward and backward together with the axle 11 to adjust the tension of the drive chain 7.

Figure 3 shows the stopper belt 18 from the X arrow direction in Figure 2.
(However, the top and bottom of the figure are reversed so that the upper side of the vehicle body is on the upper side of the figure.) The stopper belt 18 is a single band-like member bent into a substantially S-shape, and has both ends is fixed at the center by a coupling tool 18a, and the winding parts 18b extending in opposite directions are formed into a ring shape, one of which is attached to the shaft part 16a formed on the extension part 16 of the rear arm 12, and the other is attached to the left and right brackets. It is hung on eccentric cam rollers formed at 20 and 30, which will be described later.

4 to 6 are diagrams showing the right bracket 20. FIG.

FIG. 4 is a view in the Y direction direction of FIG. 2.

As shown in these figures, a step 21 for positioning is formed on the outer side surface of the right bracket 20 (left side in FIG. 5), and the inner side surface of the right arm 5r is fitted into this step 21. In the assembled state, the right bracket 20 and the right arm 5r are connected to each other by bolts 22. Further, a holder part 23 is formed on the upper part of the right bracket 20 to extend upward from the upper surface of the right arm 5r, and a circular sliding part 24a of the adjuster 24 is accommodated in a circular hole formed in the side surface of the holder part 23. , it is possible to move within the circular hole by means of a rotation shaft 25 provided at the center. A split groove 26 is formed in the annular edge surrounding the circular hole of the holder portion 23.
By adjusting the tightening with bolts 27, the rotation of the circular sliding portion 24a is permitted or prohibited.The circular sliding portion 24a has an eccentric cam roller formed eccentrically with respect to the rotating shaft 25. 24b is integrally provided, and one end of the stopper belt 18 is wrapped around the eccentric cam roller 24b.

Furthermore, a stepped portion 28 extending in the length direction of the rear fork 5 is formed on the inner surface (right side in FIG. 5) of the right bracket 20, and a side portion of a brake caliper 29 is engaged and supported here. This stepped portion 28 is formed to slidably support a brake caliper 29 whose relative position relative to the rear fork 5 changes when the tension of the drive chain 7 is adjusted by moving the position of the axle 11 back and forth. has been done. Note that, as shown in FIG. 2, the brake caliper 29 is attached to the axle l via a caliper bracket 29a.
l Mounted on top. Reference numeral 29b is a disk.

On the other hand, details of the left bracket 30 are shown in FIGS. 7 to 9, and FIG. 7 is a view taken from the direction of the Z arrow in FIG.
(The figure is turned upside down so that the upper side of the vehicle body is on the upper side.) As shown in these figures, the left bracket 3
The inner side surface of the left arm 5β is fitted into the positioning step 31 formed on the outer side surface (left side in FIG. 8) of the left arm 5β, and in this state, the left bracket 30 and the left arm 5β are interconnected with the bolt 32. be done. Further, a circular sliding portion 34a of an adjuster 34 is removably accommodated in a holder portion 33 configured similarly to the right bracket 20, and is rotated by a bolt 35, and the split groove 36 is moved between the bolts 37 and 37. The end of the stopper belt 18 is wrapped around the eccentric cam roller 34b, which is integrally formed with the 0-circular sliding portion 34a, which is fixed by tightening.

Furthermore, a recess 38 is formed on the tip side of the left bracket 30, into which the tip of the rear sub-cushion 17 is fitted and pivotally attached by a bolt 39. The rear sub-cushion 17 and the stopper belt 18 are attached to only one arm (left arm 5° C.) of the rear fork 5 via the same bracket 30. Also,
Since the brake caliper 29 is attached to the right arm 5r, the rear sub-cushion 17 and the brake caliper 2
9 are arranged on opposite sides.

FIG. 10 is a diagram partially showing the front surface side of an example of the drive belt 15, on which vertical ribs 40 are formed intermittently and long in the rotation direction. Also, the 11th
The figure shows drive belt 1 to explain the state during cornering.
5 is a cross-sectional view of the ground contact (snow) portion of No. 5, in which the vertical ribs 40 are formed outside the contact portion between the drive wheel 13 or the guide wheel 14 and the drive belt 15. In Figure 1, P1 is the soft snow surface, R2 is the hard snow surface, Ll is the base line without the vertical rib 40, L2 is the base line with the vertical rib 40, and R1 is the vertical rib on the hard snow surface. R2 is the resistance surface without the snow surface P2 (the area surrounded by the base line L1), and R2 is the resistance surface with the vertical rib 40 (the area surrounded by the snow surface P2).
2 and the base line L2), R3 indicates the resistance surface when there is no vertical rib cut into the soft snow surface (the range surrounded by the snow surface PL and the base line L1).

The width Wi of the drive belt 15 (Fig. 2), the width between the pins 13a of the drive wheel 13, or the left and right guide wheel weights 4, and the drive belt 15
The ratio of the width V/+ (Fig. 2) between the contact portion with the inner circumferential surface of is w
It is preferable to set + /Wi = about 25 to 50%.

Next, the present invention will be explained in detail. When the drive device 10 moves up and down due to unevenness on the road surface while driving, the rear fork 5
In contrast, the rear arm 12 swings relative to the axle 11. This rocking of the rear arm 12 is buffered by the rear sub-cushion 17, but the drive device 10
When the rear sub-cushion 17 reaches a predetermined amount of elongation by swinging clockwise in the figure by more than a predetermined angle, the tension of the stopper belt 18 prevents it from elongating any further. Therefore, the swing of the rear arm 12 with respect to the rear fork 5 is limited within a certain range, making it difficult for the rear end of the drive device 10 to sink into the snow, thereby preventing the occurrence of getting stuck.

Also, when adjusting the tension of the drive chain 7,
Loosen the nut 11a tied to one end of the axle 11,
For example, by rotating the adjustment nut 19c, the chain adjuster 19b is moved rearward together with the axle 11, and at the same time, the rear arm 12 is pulled rearward relative to the rear fork 5, and then the nut lla is tightened again.

The tension of the drive chain 7 is adjusted. At this time, the connection position between the rear fork 5 and the rear arm 12 changes, so the distance between the shaft part 18a of the extension part 16 (Fig. 3) and the center of each eccentric cam roller 24b and 34b changes, so the stopper belt 18 changes (in the illustrated case, the distance becomes longer and the tension becomes stronger), so by loosening the bolts 27.37 of each holder part 23.33 and turning the coaxial 25.35 once, the circular stirring is performed. Kanbu 24a, 34
a is transferred within each holder section 23.33.

Then, the eccentric cam rollers 24b and 34b also roll together, changing the tension of the stopper belt 18, and the tension can be readjusted to the original tension (in the illustrated case, the tension is loosened). Tighten the .37,
Adjustment of the tension of each stopper belt 18 is completed by fixing the circular sliding parts 24a, 34a unrotatably within each holder part 23.33.6 In this embodiment, the adjuster 24.34 is an eccentric cam roller type. Since these are used, the tension of the stopper belt 18 can be adjusted simply by rotating them.
Improves work efficiency.

Furthermore, since the adjuster 24, 34 is not attached to the rear arm 12 (the rear fork 5), the weight of the rear arm 12, which is made of movable steel, can be reduced. is maintained in good condition.

Furthermore, in this embodiment, as shown in FIGS. 10 and 11, since a large number of vertical ribs 4o are provided on the outer periphery of the drive belt 15, the vertical ribs 40 dig into the snow surface even during cornering (FIG. 11). , a particularly hard snow surface P that receives snow shear resistance in the direction of the turning center, can secure higher cornering force, and is characterized by easy cornering.
2, the resistance surface R2 of the drive belt 15 provided with the longitudinal ribs 4o is advantageous because it is clearly larger than the resistance surface R1 without the longitudinal ribs.

In addition, as described above, the ratio of the width between the two bins 13a or the contact area between the left and right guide wheels 14 and the inner circumferential surface of the drive belt 15 to the width w2 of the drive belt 15 is W I/W
! = approximately 25 to 50%, so when the drive unit 1o banks for cornering, not only the drive wheel 13 and guide wheel 14 but also the drive belt 15 as a whole tilts.
Since the resistance area in the lateral direction (in the direction of the cornering center) is increased and the vertical lip 40 can bite into the snow surface better, the cornering force is further increased.

[Effects of the Invention] In the present invention, since the stopper belt is provided with an adjuster for adjusting its tension, when adjusting the tension of the drive chain, by moving the axle position of the drive wheel, the rear fork and rear arm can be adjusted. Even when the relative connection position of the stopper belt is changed, the tension of the stopper belt can be kept constant by adjusting the adjuster. Furthermore, since the adjuster of the stopper belt is attached to the rear fork, an increase in weight on the rear arm side can be prevented despite the provision of the adjuster, and the road followability of the drive device can be maintained well.

[Brief explanation of drawings]

1 to 11 show one embodiment of the present invention, FIG. 1 is a side view showing the frame of the vehicle body, FIG. 2 is a plan cross-sectional view of the drive device, and FIG. 4 to 6 relate to the right bracket, FIG. 4 is a side view in the Y direction direction of FIG. 2, and FIG. 5 is an enlarged side view of the A-AuA shown in FIG. 4.
6 is a sectional view taken along the line B-B in FIG. 4, FIGS. 7 to 9 are related to the left bracket, FIG. 7 is a side view from the Z viewing direction in FIG. 2, and FIG. 7 is a sectional view taken along the line CC in FIG. 7, FIG. 9 is a sectional view taken along the line DD in FIG. 7, FIG. 10 is a perspective view of the main part, and FIG. (Explanation of symbols) 1...Ski, 2...Front fork, 3...
Frame, 5... Rear fork, 7... Drive chain, lO... Drive device, 11... Axle, 12...
... Rear arm, 13... Drive wheel, 14... Guide shaft, 15... Drive belt, 17... Rear sub cushion, 18... Stopper belt, 19b... Chain adjuster, 20...・Right bracket, 24.35・
...Eccentric cam roller, 30...Left bracket.

Claims (1)

[Claims] A drive wheel that is powered by a drive chain, a longitudinally long rear arm that supports the axle of the drive wheel at its front end and rotatably supports a guide wheel at a position rearward of the drive wheel, and the drive wheel and guide wheel. A drive device has an endless belt-shaped drive belt that is wrapped around the frame and meshes with the drive wheels, a ski that is steerable at the front of the frame, and a rear fork that is swingably pivoted to the rear of the frame. At the same time, the axle of the drive wheel is supported so as to be movable in the longitudinal direction to the rear end of the rear fork, so that the front end of the rear arm is swingably connected to the rear end of the rear fork. A rear sub-cushion for buffering the swinging of the rear arm and a stopper belt for regulating the amount of extension of this rear sub-cushion are provided, and an adjuster for adjusting the tension of the stopper belt is attached to the rear fork. A trackless vehicle characterized by being attached to the side.