JPS6215392B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a snowmobile, particularly left and right slide rails that are suspended on the vehicle body and extend along the front and rear directions;
A support shaft is provided at the rear end of each of these slide rails so as to be movable in the longitudinal direction of the vehicle body, a guide wheel is rotatably assembled to this support shaft, and a support shaft is attached to the rear end of each slide rail so that the support shaft can be moved to the vehicle body. The present invention relates to an improvement of a snowmobile equipped with a tension adjustment device that adjusts the tension of the track by moving it in the front and rear directions.

In this type of snowmobile, the support shaft is fixed to each slide rail so that it does not shift in the left-right and front-back directions, and each guide wheel is pressed against a predetermined position on the inner surface of the track, thereby applying a predetermined tension to the track. It is starting to be granted. By the way, when the tension of the track changes due to long-term use or the like, it is necessary to adjust the tension. However, in order to adjust the tension of a track in a conventional snowmobile, the above-mentioned support shaft is unfixed from the left and right to each slide rail to enable the support shaft to move back and forth, and then a tension adjustment device is used to adjust the support shaft back and forth. This was done by adjusting the position and finally fixing the support shaft again to each slide rail in the left and right direction. Therefore, when adjusting the tension of the track, it is necessary to release the fixation of the support shaft in the left and right direction from each slide rail, adjust the position of the support shaft, and then fix it again, which is a time-consuming process. This work was extremely troublesome because it had to be carried out within a limited space inside the truck.

The present invention has been made in view of the above-mentioned circumstances, and its main purpose is to provide a snowmobile in which the tension of the track can be easily adjusted without loosening the horizontal fixation of the support shaft. be.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a snowmobile 10 according to the present invention. This snowmobile 10 includes a pair of left and right slide rails 13, 13 which are suspended on the vehicle body via front and rear link mechanisms 11, 12 so as to be swingable in the vertical direction and extend along the front and rear direction of the vehicle body, and each of these slide rails. A support shaft 14 inserted through a bracket 20 constituting the rear end of the support shaft 13;
A total of 3 parts are rotatably attached to both left and right ends and the center of the
guide wheels 15 to 15, the rear outer periphery of each guide wheel 15, and each slide rail 1.
A track 16 is pressed against the lower surface of the motor 3 and rotated by a drive sprocket (not shown). Further, the snowmobile 10 is equipped with a steering ski 17 on the lower front surface of the vehicle body, and the steering ski 17 can be rotated by a handle 17a. As a result, the snowmobile 10 moves forward when the track 16 is driven to rotate, and its direction of movement can be changed by operating the handle 17a.

In addition, on the bottom surface of each slide rail 13, a second
As shown in the figure, sliding members 13a made of plastic or the like are attached to each slide member, thereby reducing the frictional resistance between each slide rail 13 and the track 16. Further, as shown in FIG. 1, a shock absorber 18 for suspending the link mechanism 12 is installed at the rear of the snowmobile 10, and this shock absorber 18 is connected from each slide rail 13 to the link mechanism 1.
1 and 12 to absorb shocks applied to the vehicle body. Furthermore, the track 16 is provided with a large number of openings 16a to 16a, as shown in FIGS.
6a is designed to actively allow snow to enter between the sliding surfaces of each slide rail 13 and track 16 to lubricate the sliding surfaces.

As shown in FIGS. 2 and 3, each bracket 20 is made by bending a single metal plate into a gate shape, and has an upper plate 21 and left and right legs 22, 22. A support plate 2 is provided at the rear end of each leg 22.
3 is fixed. Moreover, each bracket 20 is
The lower end of each leg 22 is attached to each slide rail 13 by fixing the lower end to the rear end of each slide rail 13 with a bolt or the like, and the upper part of each leg 22 has a screw extending in the longitudinal direction of the vehicle body. Elongated holes 24 are provided facing each other. In addition, both leg portions 22,2
A guide plate 25 is fixed horizontally between the two and located below each elongated hole 24, and a guide space 20A is formed by this guide plate 25, the upper plate 21, both legs 22, 22, and the support plate 23. It has been done. The lower end of the link mechanism 12 described above is rotatably connected to the upper front end of each of these brackets 20.

Each tension adjustment device 30 is connected to the guide space 20 described above.
It is composed of a sliding member 31 slidably inserted into A, a bolt 32 connected to the rear part of this sliding member 31, and a nut 33 screwed onto this bolt 32. Each sliding member 31 is formed into a box shape, and has holes 3 in its left and right side walls 31a, 31b.
4 and 34 are provided horizontally so as to face each other, and both ends of the aforementioned support shaft 14 can be inserted into each of these holes 34. Further, each sliding member 31 has its left and right side walls 31a, 31b slidably abutted on each of the legs 22, 22 of the bracket 20, and its upper and lower walls 31c, 31d are brought into contact with the bracket 20.
The bracket 20 is slidably abutted against the upper plate 21 and guide plate 25 of the bracket 20, respectively, and is slidable only in the longitudinal direction of the vehicle body along each elongated hole 24 of the bracket 20 within the aforementioned guide space 20A. There is. The bolt 32 serves as a positioning and fixing means together with the nut 33, and as shown in FIG. Hole 23a
It is inserted into the bracket 20 and protrudes to the rear of the bracket 20 so that it can move forward and backward, and is connected to the sliding member 31 at its head 32b so as not to be able to move backward. In this case, the head 32b of the bolt 32 is formed in a substantially rectangular shape, so that both sides of the head 32b of the bolt 32 are regulated by the legs 22, 22 of the bracket 20, and the bolt 32 is held against the sliding member 31. It is unable to rotate. Also, the nut 33 screwed onto the bolt 32
is in contact with the support plate 23 of the bracket 20 via a washer 33a to restrict the movement of the bolt 32, and is located at a position where it can face the opening 16a of the track 16.

Further, as shown in FIG. 3, a plurality of collars 41 to 44 serving as positioning means are fitted onto the support shaft 14 of the snowmobile 10. Color 41 is
The guide wheel 1 has its left and right ends 41a and 41b assembled to the left end of the support shaft 14 (lower end in FIG. 3).
The inner race 18a of the bearing 18 rotatably supports the slider 5 and the left side wall 31a of the sliding member 31 assembled to the left slide rail 13, respectively. The collar 42 is interposed between the side walls 31a, 31b of the sliding member 31, and its both ends are brought into contact with the side walls 31a, 31b. Further, the collar 43 has both left and right ends 43a and 43b.
are brought into contact with the right side wall 31b of the sliding member 31 assembled on the left slide rail 13 and the inner race 19a of the bearing 19 that rotatably supports the guide wheel 15 at the center of the support shaft 14. . Furthermore, both ends of the collar 44 are brought into contact with the inner race 19a of the bearing 19 and the right sliding member 31 (not shown), and the collar 44 is attached to the right end guide wheel 15 (not shown) and the right sliding member 31 (not shown). Both ends of a collar similar to 41 are brought into contact. Incidentally, the inner diameter of each collar is approximately the same as the diameter of the support shaft 14, and the outer diameter of each collar is large enough to fit into each elongated hole 24 provided in each leg 22 of each bracket 20. There is.

As shown in FIG. 3, the inner races 18a of the bearings 18 located at both ends of the support shaft 14 inserted into each of the collars 41 to 44 are attached to both ends of the support shaft 14 by bolts 15a. By pressing inward with the press plate 15b attached to the collar, the collars 41 to 44 are brought into pressure contact with members located at both ends of the collars 41 to 44, respectively. This results in
The support shaft 14 is connected to the guide space 20 of each bracket 20.
Each slide rail 13 is inserted through each sliding member 31 fitted into A so as to be slidable only in the longitudinal direction of the vehicle body.
Movement in the left-right direction is restricted by the bolt 32 and nut 33, and movement in the front-rear direction is restricted by the bolt 32 and nut 33. Each guide wheel 15 supported on the support shaft 14 is positioned at a predetermined position with respect to the vehicle body, and presses the track 16 rearward from inside to apply a predetermined tension.

Therefore, in the snowmobile 10 configured as described above, if the tension of the track 16 changes due to long-term use, etc., it is necessary to insert the nut 33 of each tension adjustment device 30 through the opening 16a of the track 16. When the socket trench L is turned in the forward or reverse direction, each bolt 32 moves back and forth with respect to the bracket 20.
A sliding member 31 connected to this bolt 32 moves back and forth within the guide space 20A of each bracket 20. As a result, the support shaft 14 moves back and forth within each elongated hole 22 without releasing its fixation in the left and right direction, and the position of each guide wheel 15 pivotally supported on this support shaft 14 is adjusted. The tension of the abutting track 16 is adjusted. In this case, since the nut 33 of each tension adjustment device 30 faces the opening 16a located at the rear of the track 16, its rotation operation can be easily performed using the socket trench L inserted from the rear of the snowmobile 10 through the opening 16a. ,
Track 16 does not get in the way. In addition, since the tension of the track 16 is applied to each bolt 32 as a forward force through each guide wheel 15, support shaft 14, and each sliding member 31 that contact this track 16, each nut 33 are in pressure contact with each support plate 22 via washers 33a to prevent them from loosening, and there is no need to prevent each nut 33 from loosening by using another nut or the like.

5 to 7 show another embodiment of the present invention, in which a bracket 12 forming the rear end of each slide rail 13 of the snowmobile 10 is shown.
The upper part of 0 is formed into a plate shape extending in the front-rear direction of the vehicle body by joining the upper parts of both leg parts 121, 121 to each other. (Figures 6 and 7
In addition, each of these brackets 120 has an elongated hole 122 extending in the longitudinal direction of the vehicle body formed in the upper part thereof, and each leg portion 121 located at the rear of this elongated hole 122 can be bulged out. Accordingly, the bolt 132 constituting the tension adjustment device 130
A shaft support 123 is formed.

Each tension adjustment device 130 is connected to each bracket 120.
Sliding member 1 slidably inserted into elongated hole 122 of
31, a bolt 132 connected to the rear part of this sliding member 131, and a nut 133 screwed onto this bolt 132. Each sliding member 131 is block-shaped, and a through hole 134 is provided in the center thereof in the left-right direction of the vehicle body, through which both ends of the aforementioned support shaft 14 are inserted. Also,
As clearly shown in FIG. 6, each sliding member 131 has a small diameter part 131a that is fitted into the elongated hole 122 of the bracket 120, and a large diameter part 13 that has a guide surface 131c that comes into sliding contact with the side surface of the bracket 120.
It consists of 1b. Each bolt 132 constitutes positioning and fixing means together with a nut 133, and its tip 132a is inserted into the shaft support 123 of the bracket 120 so as to be movable forward and backward.
A stepped inner hole 1 that projects rearward from the sliding member 131 and has a head 132b formed in the front-rear direction of the sliding member 131.
The sliding member 131 is locked to the stepped portion 135a of 35.
It is unrotatably connected to. Also, Natsu 133
is in contact with the shaft support 123 of the bracket 120 via a washer 133a to restrict movement of the bolt 132. In addition, in Figures 5 to 7,
Although only the tension adjustment device 130 provided on the left slide rail 13 side is shown, a similar tension adjustment device 130 is also provided on the right slide rail 13, and in this case, the tension adjustment device 130 provided on the right slide rail 13 side is shown. is assembled in the opposite direction to that on the left.

Further, on the support shaft 14, as shown in FIG.
42 etc. is fitted. Similar to the collar 41 described above, the collar 141 has both ends connected to the inner race 18a of the bearing 18 for the left guide wheel 15 and the small diameter portion 131 of the left sliding member 131.
It is brought into contact with a. Further, both ends of the collar 142 are brought into contact with the large diameter portion 131b of the left sliding member 131 and the inner race of a bearing for a central guide wheel (not shown). moreover,
A collar similar to the collar 142 is interposed between the center guide wheel and the right sliding member (not shown), and a collar similar to the collar 141 is interposed between the right sliding member and the right end guide wheel (not shown). It has been done. As shown in FIG. By pressing inward with pressing plates 15b attached to both ends of the collars 141, 142 by bolts 15a, the collars 141, 142, etc. are brought into pressure contact with each member located at both ends. As a result, each sliding member 13
1, the guide surface 131c of the large diameter portion 131b contacts the leg portion 121 of each bracket 120 from inside, and can slide only in the longitudinal direction of the vehicle body along the elongated hole 122 of each bracket 120. Further, the support shaft 14 is restricted from moving in the left and right direction relative to each slide rail 13 via these sliding members 131, and is regulated by each bolt 132 and nut 133.
The movement in the front and back direction is restricted by this, and each guide wheel 15 on this support shaft 14 is positioned at a predetermined position with respect to the vehicle body, and a predetermined tension is applied to the track 16.

Therefore, in this embodiment as described above, when the tension of the track 16 changes and is to be adjusted, by rotating the nut 33 of each tension adjustment device 130 in the forward or reverse direction, each bolt 132 is aligned with the bracket 12.
0, and a sliding member 131 connected to this bolt 132 moves back and forth within an elongated hole 122 provided in each bracket 120. As a result, the support shaft 14 can move back and forth within each elongated hole 122 without releasing its fixation in the left and right direction.
Each guide wheel 15 pivotally supported on this support shaft 14
The position of the track 16 is adjusted and comes into contact with the track 16.
The tension can be adjusted. The rest is the same as in the case of the tension adjustment device 30 described above.

As described in detail above, in the present invention, as illustrated in each of the embodiments above, the slide rail 13 is attached to the rear end of each slide rail 13 constituting the snowmobile 10, and each guide wheel 15 is rotatably supported. Tension adjustment device 3 that adjusts the tension of the track 16 of the snowmobile 10 by moving the support shaft 14 in the front-back direction
0,130 are fitted onto both ends of the support shaft 14 and supported in the elongated holes 24, 122 of the rear end (bracket 20 or 120) of each slide rail 13 so as to be slidable only in the longitudinal direction of the vehicle body. Moving members 31, 13
1 and positioning and fixing means (bolts 32 and nuts 33) provided at the rear end of each slide rail 13 to move each sliding member 31, 131 in the front-rear direction of the vehicle body.
Or composed of a bolt 132 and a nut 133,
On the other hand, the support shaft 14 is provided with positioning means (positioning means) that abuts on each sliding member 31, 131) collars 41 to 44 or 14.
1, 142, etc.) to restrict the movement of the support shaft 14 in the left-right direction with respect to the slide rail 13 only via this positioning means and each sliding member 31, 131. The feature is that the slide rail 13 can be moved back and forth while being fixed in the left and right direction, and as a result, the work of adjusting the tension of the track is replaced by the work of releasing and adjusting the support shaft from the left and right fixing of each slide rail. This can be easily done without having to re-fix the track afterwards, and since the support shaft is supported at both ends, even though it is not directly fixed to the rear end of the slide rail, the tension of the track can be applied to the guide wheel. It is possible to provide a snowmobile with sufficiently high attachment strength to a slide rail.

[Brief explanation of the drawing]

Fig. 1 is a side view of a snowmobile according to the present invention, Fig. 2 is an enlarged side view of the main part taken along the - line in Fig. 3, and Fig. 3 is a cross-sectional plan view taken along the - line in Fig. 2. 4 is a rear view taken along the arrow in FIG. 3. 5 and 6 show other embodiments of the present invention, in which FIG. 5 is an enlarged side view of the main parts of the snowmobile, and FIG. 6 is a longitudinal section taken along the line - in FIG. 7 is a partial plan view of FIG. 5. Explanation of symbols, 10... Snowmobile, 13... Slide rail, 14... Support shaft, 15... Guide wheel, 16... Track, 20, 120... Bracket (rear end of slide rail), 24, 122
...Elongated hole, 30,130...Tension adjustment device, 3
1,131...Sliding member, 32,132...Bolt, 33,133...Nut (positioning and fixing means), 41-44,141,142...Collar (positioning means).

Claims (1)

[Claims] 1. Left and right slide rails that are suspended from the vehicle body and extend along the front and rear directions to press the truck from inside, and both ends of the slide rails are pushed through elongated holes provided along the front and back directions at the rear ends of these slide rails. a support shaft mounted so as to be movable in the front-rear direction; a plurality of guide wheels rotatably mounted to the support shaft to press the track rearward from the inside thereof; and a rear end of each slide rail. In a snowmobile equipped with a tension adjustment device that is attached to each of the snowmobiles and adjusts the tension of the track by moving the support shaft in the longitudinal direction of the vehicle body, each of the tension adjustment devices includes:
a sliding member fitted to both ends of the support shaft and supported in an elongated hole at the rear end of each of the slide rails so as to be slidable only in the longitudinal direction of the vehicle body; and a sliding member provided at the rear end of each of the slide rails. and positioning and fixing means for moving and positioning each of the sliding members in the longitudinal direction of the vehicle body, and on the other hand, a positioning means that abuts on each of the sliding members is fitted on the support shaft, and this positioning means and the A snowmobile, characterized in that movement of the support shaft in the left-right direction with respect to the slide rail is restricted only through a sliding member.