WO1999047411A1

WO1999047411A1 - Adjustment structure for a cushion unit

Info

Publication number: WO1999047411A1
Application number: PCT/IB1999/000668
Authority: WO
Inventors: Tadashi Takayama; Kaoru Karuna; Takahiko Kobota
Original assignee: Yamaha Hatsudoki Kabushiki Kaisha
Priority date: 1998-03-17
Filing date: 1999-03-17
Publication date: 1999-09-23
Also published as: CA2291168C; CA2291168A1

Abstract

In an adjustment structure for a cushion unit (44), wherein at least in one end side (44a) of said cushion unit, an axis member (55) for supporting an end part of said cushion unit is movably mounted relative to a pair of mount brackets (45) by a bolt axis (58) supporting said axis member (55) and adjustment guide apertures (60) formed in each mount bracket for penetrating said bolt axis so that a position of said cushion unit is adjustable, it is characterized that a treatment (60a) is given in a contact surface between said adjustment guide apertures (60) and bolt axis (58) to which compression reaction force of the cushion unit is applied so as to prevent the skidding of said bolt axis relative to said apertures.

Description

[Document Name] Statement

[Title of Invention] Adjustment structure of cushion unit

DETAILED DESCRIPTION OF THE INVENTION

C 0 0 0 1;]

TECHNICAL FIELD OF THE INVENTION

The present invention relates to an adjustment structure for adjusting a mounting position of a cushion unit, and more particularly to an adjustment structure used for a suspension unit of a snowmobile driven and driven by an endless track belt. Related to a typical cushion unit adjustment structure. [0 0 0 2]

[Prior art]

In a snowmobile that travels on the snow surface by driving the endless track belt, a pair of left and right slide rails for guiding the lower part (ground surface) of the endless track belt swing up and down according to the undulation of the snow surface. In order to be able to move, it is suspended by a front suspension part and a rear suspension part so as to be able to swing in the longitudinal direction of the vehicle body with respect to the vehicle body frame located above it. A rear suspension portion is constituted by a link mechanism and a cushion unit. Conventionally, the cushion unit of the rear suspension portion generally has one end provided by a shaft pivotally supported by a vehicle body frame. The other end is attached to the body rail side and the other end is attached to the slide rail side by a cross member spanned by a pair of left and right slide rails.

[0 0 0 3]

Then, by adjusting the mounting position of the cushion unit on the side of the cross member of the slide rail with respect to the cushion unit mounted on the vehicle body frame side and the slide rail side in this manner. It has been practiced to adjust the spring constant (reaction force) at the rear of the contact surface of the endless track belt according to the load weight (the weight of the occupants and luggage).

[0 0 0 4]

However, in such a conventional adjustment structure for a cook: noun, it is necessary to loosen or retighten the fastening screws at both ends of the cross member fixed to the pair of left and right slide rails, respectively. When making adjustments by the operator, it is necessary to work on one side of the vehicle body and then turn to the other side, which is extremely poor workability, and at the same time, the adjustment point is close to the snow surface However, the adjustment part is likely to be covered with snow while the snowmobile is traveling, and when performing adjustment work after traveling, it is necessary to remove the snow covering the adjustment part first. This is one of the factors that reduces workability.

[0 0 0 5 3

Therefore, in order to deal with such problems, the cushion unit of the rear suspension unit, which is installed in the space surrounded by the endless track belt, is placed almost at the center in the width direction of the vehicle body, and Place it near the inner surface and at least one of the cushion units On the end side, a shaft member that supports the end of the cushion unit is connected to one bolt shaft that supports the shaft member, and a pair of mounting brackets for penetrating the bolt shaft. It has already been considered by the present applicant that the mounting position of the cushion unit is adjusted by movably fixing the mounting bracket to the mounting bracket with the formed adjustment guide hole. (Japanese Patent Application No. 7 — 3 1 2 9 6 8)

[0 0 0 6]

[Problems to be solved by the invention]

By the way, according to the above-described cushioning adjustment structure for a snowmobile according to the present applicant, the nut of the bolt shaft inserted into the adjustment guide hole of the pair of mounting brackets is loosened, After moving the bolt shaft in the adjustment guide hole, the nut is tightened again to the bolt shaft, and the shaft member supported by the bolt shaft is fixed to the pair of mounting brackets, so that the cushion unit Adjustment work can be easily performed from one side of the vehicle body, and the adjustment part is far from the snow surface, making it difficult to be covered with snow even after running. Adjustment work can be performed efficiently.

[0 0 0 7]

However, even in such a cushion unit adjusting structure, when the mounting position of the cushion unit is adjusted in a state where the snowmobile is placed in a normal position, the weight of the vehicle body higher than the cushion unit is increased by the weight of the cushion unit. The reaction force of the compression force acts on the contact surface between the adjustment guide hole and the bolt shaft, and the bolt shaft is moved in the adjustment guide hole by staking against the compression reaction force of the cushion unit. There is a problem that it takes much effort to make the task difficult.

[0 0 0 8]

In other words, there is no problem when working with the snowmobile lying down so that the weight of the car body does not act on the cushion unit.However, depending on the type of machine and the work situation, such a problem is not necessarily required. It is not always possible to work in a state, and in such a case, the above-mentioned problems occur.

[0 0 0 9]

Regarding this point, even if the snowmobile remains in the normal position, Use a control rod to set the vertical movement of the slide rail to the specified range, and fix the control rod in an extended state so that no compression force acts on the cushion unit. Therefore, it has also been proposed to adjust the mounting position of the cushion unit.

[0 0 1 0]

However, even if the cushion unit is set to the maximum extension state (the state in which the compression force is not applied) during the adjustment work, the cushion is stretched before the cushion unit and the cushion unit is stretched. It may not be possible to achieve the maximum extension of the cushion unit, and even if the maximum extension of the cushion unit can be achieved by fixing the control rod in an extended state, the state is maintained. It takes a lot of power to work, so it is troublesome to do it alone.

[0 0 1 1;]

In addition, the setting of the expansion / contraction range of the control rod is important, and if this is changed even temporarily, it may cause an error when returning to the original setting value. It is not a good thing to tweak the world, but we want to avoid it as much as possible.

[0 0 1 2;]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems. Specifically, the present invention relates to a structure for adjusting a mounting position of a cushion unit, which is provided on a mounting portion of the cushion unit. With the compression reaction force of the cushion unit still applied, the cushion reaction unit can easily use the compression reaction force without using a force that resists the compression reaction force. It is an object to make it possible to adjust a mounting position.

[0 0 1 3 J

[Means for Solving the Problems]

In order to solve the above-described problems, the present invention provides a method of pivotally supporting an end of a cushion unit at least at one end of the cushion unit, as described in claim 1 above. A shaft member to be mounted is formed on each of a pair of mounting brackets, one bolt shaft supporting the shaft member, and each of the mounting brackets for penetrating the bolt shaft. In the cushioning unit adjustment structure that is fixed so that the position can be adjusted by the adjusted adjustment hole, the adjustment guide hole and the bolt shaft on which the compression reaction force of the cushion unit acts. Each of the abutment surfaces is characterized by being processed so that the rotation of the bolt shaft does not run idly with respect to the adjustment guide hole.

[0 0 1

Further, in the cushioning unit adjusting structure described in claim 1, as described in claim 2 above, the cushioning unit is mounted via a shaft member whose position can be adjusted at least on one end side. The cushion unit guides the slide rail, which guides the lower inner surface of the endless track belt, to the vehicle body frame located above it by the front suspension unit and the rear suspension unit. The present invention is characterized in that the cushion unit on the side suspension unit is a cushion unit on the rear suspension unit in a snow vehicle in which the cushion unit on the side suspension unit is disposed near the upper inner surface of the endless track belt.

[0 0 1 5 3

Furthermore, in the cushion unit adjusting structure described in claim 2, as described in claim 3, at least the upper end portion is infinitely covered by the vehicle body frame in a side view. For the cushion unit located near the upper inner surface of the track belt, the adjustment guide hole for adjusting the position of the cushion unit and the bolt shaft are located in the "P" direction of the body frame. It is characterized by facing the side of the vehicle.

[0 0 1 6]

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a cushion unit adjusting structure of the present invention will be described with reference to the drawings.

C 0 0 1 7]

FIG. 1 schematically shows a snowmobile to which the cushioning adjustment structure of the present invention is applied. In the snowmobile 1, the vehicle body is covered with a resin power ring 2 so as to cover the snowmobile. Engine 4 is mounted in front of frame 3, and seat 5 is provided above body frame 3 behind cowling 2, and steering hand is provided in front of seat 5. A steering ski 7 operated by the steering handle 6 is provided in the vicinity of the front end of the vehicle body, and a driving track section 8 driven by the engine 4 is provided behind the steering ski 7. And is provided below the body frame 3.

[0 0 1 8]

The drive track section 8 includes a drive wheel (drive pocket) 10 that is driven to rotate in conjunction with the rotation of the engine 4, an endless track belt (track belt) 11 that is driven by the drive wheel 10, A pair of left and right slide rails 12 that guide the lower inner surface (behind the ground contact surface) of the track belt 11 and guide wheels that guide the upper part of the endless track belt 11 behind the drive wheels 10 1), guide wheels (guide wheels) 14 that guide the lower rear end of the endless orbit belt 11 at the rear end of the slide rails 12 and the body frame 3 Each suspension part (suspension) 15, 16 for suspending the vehicle.

[0 0 1 9 3

In the drive track section 8, the drive wheel 10 and the guide wheel 13 are supported on the side of the body frame 3, and the guide wheel 14 is supported on the side of the slide rail 12; In addition, the slide rails 12 are provided with idler wheels (idlers) in order to reduce the friction at the contact surfaces between the endless track zone 11 and the slide rails 12 by partially leaving them in a non-contact state. Wheels) 17 are respectively supported at a plurality of appropriate locations.

[0 0 2 0:]

FIGS. 2 and 3 show the slide rails 12 and the suspensions 15 and 16 of the driving track 8 of the snowmobile 1 shown in FIG. 1 in detail, and FIG. 2 is a view from the left side. Fig. 3 shows the left half of the vehicle body as viewed from above. The slide rails 12 move up and down with respect to the vehicle frame 3 in accordance with the ups and downs of the snow surface. It is supported by a front suspension (front suspension) 15 and a rear suspension (lyus suspension) 16 so that it can swing in any direction.

[0 0 2 1]

As for the front suspension portion 15, a pair of left and right torque arms 20 are provided along the front-rear direction of the vehicle body on both sides of the center portion in the width direction of the vehicle body, respectively. The front end of 20 is rotatably fixed to the vehicle body frame 3 via a shaft member 21 rotatably supported by the vehicle body frame 3, and the other end of the torque arm 20. Is rotatably fixed to the slide rail 12 via a shaft member 22 rotatably supported across left and right slide rails 12.

[0 0 2 2]

Further, in front of the shaft member 22, a shaft member 23 is further supported across left and right slide rails 12, and the shaft member 21 on the vehicle body frame side and the shaft member on the slide rail side are further supported. A cushion unit 24 including a coil spring and a hydraulic shock absorber is provided along the member 23 along the longitudinal direction of the vehicle body at the center in the width direction of the vehicle body. ―

C 0 0 2 3]

That is, one end of the cushion unit 24 is located at the center in the width direction of the shaft member 21 on the vehicle body frame side, and a pair of left and right mounting brackets 25 each having one end fixed to the shaft member 21. The other end of the cushion unit 24 is supported by a pair of left and right mounting brackets 26 fixed to the widthwise center of the shaft member 23 on the slide rail side. Have been.

[0 0 2 4]

Further, in order to restrict the upward rotation of the torque arm 20 with respect to the slide rail 12 within a predetermined range, a stopper band 27 having a screw member 28- at one end connected to the left and right torque. It is provided for each of the arms 20, and the other end of each stopper band 27 is attached to a shaft member 23 on the slide rail side.

[0 0 2 5]

The screw member 28 connected to one end of each stopper band 27 is strongly screwed to the bracket 29 fixed in the middle of the torque arm 20 so as to be able to advance and retreat. By moving the screw member 28 forward and backward with respect to the bracket 29, the range of the upward rotation of the torque arm 20 with respect to the slide rail 12, that is, the downward movement of the slide rail 12 with respect to the vehicle body frame 3. The degree of regulation of movements can be adjusted.

[0 0 2 6] For the rear suspension part 16, a pair of left and right link mechanisms consisting of link members 31, 32, 33, 34, 35, respectively, are provided on both sides of the center part in the width direction of the vehicle body. For this link mechanism, a cushion unit 44 composed of a coil spring and a hydraulic shock absorber is provided at the center in the width direction of the vehicle body and in the upper part of the endless track belt 11. A pair of left and right control rods 42, which are provided near the side surface and extend and contract by a predetermined amount, are provided at both ends in the width direction of the vehicle body.

[0 0 2 7]

In the link mechanism of the rear suspension section 16, the upper end of the link member 31 located at the front end of the link mechanism is fixed to a shaft member 36 rotatably supported by the body frame 3. Thus, the lower end of the link member 31 is connected to the front end of the link member 32 via a shaft member 37. The rear end of the link member 32 is rotatable via a shaft member 39 at the lower end of the link member 33 fixed to a shaft member 38 rotatably supported by the vehicle body frame 3. It is linked to

[0 0 2 8]

A front end of a link member 34 extending rearward is further fixed to the shaft member 38 to which the link member 33 is fixed, and a rear end of the link member 34 is fixed to the rear end of the link member 34. The upper end of the link member 35 is connected via a shaft member 40 spanned to the left and right of the link member 34, and the lower end of the link member 35 is connected to the left and right slide rails 12 It is rotatably fixed to the slide rail 12 via a shaft member 41 rotatably supported on the slide rail 12.

[0 0 2 9:!

The control rod 42 of the rear suspension part 16 is extendable and contractable by a predetermined amount, and the amount of expansion and contraction is adjustable, and the front end thereof has a shaft member 3 on the vehicle body frame side. 8 so that it is rotatable and the rear end is rotatably fixed to the slide rail 12 by means of shafts (bolts and nuts) 43 so that it can move in the longitudinal direction of the vehicle. It is provided in a state where it is inclined upward and forward. By restricting the movement of the link mechanism to a predetermined range according to the amount of expansion and contraction of the control rod 42, the body frame 3 , The downward movement of the slide rail 12 can be restricted to a predetermined range.

[0 0 3 0 3

The cushion unit 44 of the rear suspension unit 16 is located at the center in the width direction of the vehicle body, and is provided with the endless track belt 11 so that at least the upper end thereof is covered by the vehicle body frame 3 in a side view. The front end of the cushion unit 44 is fixed to the shaft member 36 on the body frame side near the upper inner side surface, with the front end of the cushion unit 44 being inclined forward and downward along the front and rear direction of the body. The left and right sides of the cushion unit 44 are fixedly supported across the shaft member 38 and the link member 34 on the vehicle body frame side. It is supported by a pair of mounting brackets 46.

[0 0 3 1]

According to the suspensions 15 and 16 of the slide rail 12 as described above, the slide rail 12 that guides the contact surface of the endless track zone 11 while the snowmobile 1 is running has an uneven surface. To the vehicle body frame 3, as a result, the torque mechanism 20 of the front suspension part 15 and the link mechanism 31 of the rear suspension part 16 are connected to the body frame 3. The shaft member 21 and the shaft member 38 on the vehicle body frame side swing through the shafts 3, 3 4, and 35.

[0 0 3 2 3

In this case, in the front suspension portion 15, the shaft member 21 and the mounting bracket 25 fixed thereto are rotated by the swing of the tok arm 20 around the shaft member 21, When the cushion unit 24 expands and contracts due to the rotation of the mounting bracket 25, the impact that the slide rail 12 receives from the snow surface due to the damping force generated in the cushion unit 24. Is partially absorbed.

[0 0 3 3]

On the other hand, in the rear suspension part 16, the mounting bracket 4 fixed to the shaft member 38 is rotated by the rotation of the link members 34, 35 of the link mechanism around the shaft member 38. 6 rotates around the shaft member 38, and as the shaft member 38 rotates, the link member 31 and the link member 31 move the shaft member 36 through the link member 33 and the link member 32. By pivoting about the center, the mounting bracket 45 and the cushion whose both ends are connected to the mounting bracket 46 The unit 44 expands and contracts, and the damping force generated in the cushion unit 44 absorbs part of the impact that the slide rail 12 receives from the snow surface.

[0 0 3 4]

When the snowmobile 1 travels on a gently undulating snow surface, the slide rails 12 are appropriately pitched with respect to the vehicle body frame 3 within a range in which the control rods 42 expand and contract. Therefore, the vehicle body frame 3 itself is not pitched, and the grounding zone 11 has a high level of contact with the ground.

[0 0 3 5

On the other hand, when the snowmobile 1 passes through a local protrusion on the snow surface, the pitching of the slide rails 1 2 is allowed only in the range where the control rod 42 expands and contracts and is small. Controlled and further pitching of the slide rails 12 is prevented by the control openings 42, so that even when the snowmobile 1 passes at high speed over local projections on the snow surface However, the pitching of the vehicle body frame 3 due to the large pitching reaction of the slide rails 12 is restricted.

[0 0 3 6]

In addition, each of the pair of left and right slide rails 12 is a rear end portion of a slide rail that supports the guide wheel 14 so that the rear end of the drive track portion 8 can smoothly ride over a protrusion on the snow surface when moving backward. 1 2 a force The slide rail 12 is connected to the main body of the slide rail 12 so as to be able to rotate upward while being formed separately and urged by a panel member to always return to the original position. ing.

[0 0 3 7]

Specifically, as shown in FIG. 4, the rear end 12 a of the slide rail 12 pivots with respect to the mounting portion 12 b erected at the rear end of the body of the slide rail 12. The pivot shaft 62 is rotatably connected upward through both the pivot arm 61 and the pivot shaft 62. The pivot shaft 62 always returns the rear end portion 12a to its original position (immediately. That is, the front end of the rear end portion 12a is close to the rear end of the main body, and the lower surface of the main body and the lower surface of the rear end portion 12a return to a state in which they form substantially the same plane.) A spring member (coil spring 68) for biasing is provided. [0 0 3 8 3

The pivot arm 61 is fixed to the rear end portion 12a at two places by a bolt shaft 63 (and a nut) and a bolt shaft 64 (and a nut). As shown in Fig. 5, the front end of the sleeve 70 and the bush 72 into which the bearing 71 is press-fitted are connected to the upper part of the mounting portion 12b by a bolt shaft 65 (and a nut). The bush 72 and the mounting portion 12b are integrated by a pin 73 so as to be rotatable.

[0 0 3 9]

As a result, when the pivot arm 61 rotates around the bolt shaft 65, relative movement in the circumferential direction occurs between the outer peripheral surface of the sleeve 70 and the inner peripheral surface of the bearing 71. Has become. (Without the pin 73, when the pivot arm 61 rotates around the bolt shaft 65, slippage occurs between the outer peripheral surface of the bush 72 and the mounting portion 12b, thereby causing Metal wear will occur.)

[0 0 4 0]

One end of the pivot shaft 62 is rotatably connected to the shaft 66 of the idler wheel 17 rotatably supported at the lower part of the mounting portion 12b of the slide rail. At the same time, the vicinity of the center portion is slidably fitted into the shaft support member 67, and the shaft support member 67 is rotatably supported by the shaft 64. It is slidably and rotatably supported on the rear end portion 12a of the slide rail.

[0 0 4 1 3

The pivot shaft 62 has a coil split as a panel member for urging the rear end protruding rearward from the shaft support member 67 in a direction to return the rear end portion 12a to the original position. The shaft 68 is secured by a nut 69 screwed to the rear end of the pivot shaft 62, and the panel supporting force can be adjusted. And a nut 69.

[0 0 4 2]

FIG. 6 shows in detail a mounting portion of the front end of the cushion unit 44 of the rear suspension unit 16 of the snowmobile 1 as described above. The cushion unit 44 of the rear suspension unit 16 has a front end 44 a where the mounting position can be adjusted.

[0 0 4 3]

The left and right link members 31 fixed to the shaft member 36 are parallel to the outside of each of the left and right mounting brackets 45 to which the front end portion 44 a of the cushion unit 44 is attached. The shaft member (collar) 37 connecting the link member 31 and the link member 32 is provided with a spacer interposed between the left and right mounting brackets 45. The bolt 51 is fixed to the link member 31 and the mounting bracket 45 by a bolt 52 screwed from the outside of the link member 31 to the shaft member 37. The front end 32a of the link member 32 is supported via the bearing member 53.

[0 0 4 4]

The front end 44 a of the cushion unit 44 of the rear suspension 16 is connected to the shaft members (collars) 55 fixed between the left and right mounting brackets 45, and the spacers on both sides are The shaft member 55 is supported by a bearing member 57 positioned by 56, and the shaft member 55 is secured by a single bolt shaft 58 penetrating the hollow shaft center. Nut to be screwed into screw part 58b formed at the end opposite to the head 58a

It is fixed between the left and right mounting brackets 45 by tightening 5 9.

[0 0 4 5 3

Each of the left and right mounting brackets 45 is a cushion unit mounting hole for inserting one bolt shaft 58 for fixing the shaft member 55, as shown in FIG. A long adjustment guide hole 60 extending in the same direction as the circumferential direction centering on the shaft support portion 47 at the rear end of 4 4 is provided.Each adjustment guide hole 60 has Three substantially semicircular engagement recesses for positioning the bolt shaft 58

60 a, 60 b, and 60 c are formed, respectively.

[0 0 4 6 :!

As a result, after the nut 59 of the bolt shaft 58 is loosened, the bolt shaft 58 is moved in the adjustment guide hole 60 so that the bolt shaft 58 is engaged with the engagement recess 60 a to 60. By tightening the nut 59 again while engaging with any one of c, the mounting position of the shaft member 55 that supports the front end 44 a of the cushion unit 44 is moved in three stages. adjust You can do it.

[0 0 4 7 3

The cushion unit 44 is disposed near the upper inner surface of the endless track belt 11 and is arranged so that the upper end thereof is covered by the vehicle body frame 3 in a side view. An adjustment guide hole 60 and a bolt shaft 58 for adjusting the position of the cushion unit 44 are arranged below the vehicle body frame 3 so as to face the side of the vehicle body.

[0 0 4 8]

In this way, by adjusting the mounting position of the front end 44a of the cushion unit 44 of the rear suspension 16 to three stages, the load weight (weight of passengers and luggage) and traveling speed can be reduced. By changing the stroke speed (damping force) of the cushion unit 44 accordingly, the reaction force (spring constant) at the rear of the contact surface of the endless track zone 11 can be adjusted.

[0 0 4 9 3

Further, in the present embodiment, in the structure for adjusting the mounting position of the front end portion 44a of the cushion unit 44 by the bolt shaft 58 and the adjustment guide hole 60 as described above, the cushion unit 4 Rotation of the bolt shaft 58 with respect to the contact surface between the bolt shaft 58 on which the compression reaction force of 4 acts and the adjustment guide hole 60, and the idle rotation with respect to the adjustment guide hole 60. Processing that does not allow it to be applied.

[0 0 5 0 3

That is, as shown in FIG. 8, each part of the both ends of the bolt shaft 58 contacting each inner peripheral wall of the pair of left and right adjustment guide holes 60 is provided with respect to the entire circumference of the bolt shaft 58. The side where the serrations 58 c are cut and the engaging recesses 60 a, 60 b, 60 c of the adjustment guide hole 60 are formed (the compression reaction force of the cushion unit 44). On the side on which the bolt acts via the bolt shaft 58), a large number of small grooves 6 are formed on the inner peripheral wall of the adjustment guide hole 60 so as to engage with the bolts 58 of the bolt shaft 58. 0 d is truncated.

[0 0 5 1]

According to the adjustment structure of the cushion unit 44 of the present embodiment in which the respective contact surfaces of the bolt shaft 58 and the adjustment guide hole 60 are applied as described above, the cushion unit 4 Compression reaction force of 4 works, and bolt shaft 58 engages adjustment guide hole 60 Even if it is pressed into the recess (any of 60a to 60c), loosen the nut 59 of the bolt shaft 58, and then turn the bolt head 58a with a tool to tighten the bolt. By simply rotating the shaft 58 in the desired direction, the serration 58 c of the bolt shaft 58 and the small groove 60 d of the adjustment guide hole 60 engage with each other (due to the compression reaction force of the cushion unit 44). Therefore, the bolt shaft 58 can be easily moved while rolling along the inner peripheral wall of the adjustment guide hole 60.

C 0 0 5 2:]

Further, in the present embodiment, the cushion unit 44 of the rear suspension unit 16 for suspending the slide rail 12 of the snowmobile 1 is arranged near the upper inner surface of the endless track belt 11. —This isolates the bolt shaft 58 (and the adjustment guide hole 60 ') for adjusting the mounting position of the end (front end 44a) of the cushion unit 44 from the snow surface. As a result, a space is formed between the bolt shaft 58 and the lower portion of the endless track zone 11 (on the grounding surface side), so that the bolt shaft 58 is hardly covered with snow and the adjustment guide hole 60 and Since the bolt shaft 58 is positioned below the vehicle body frame 3 and faces the vehicle body side, workability for adjusting the mounting position of the cushion unit 4 4 can be improved. .

[0 0 5 3:!

As for the adjustment structure of the mounting position of the cushion unit 44 of the rear suspension part 16 that suspends the slide rail 12 of the snowmobile 1, as described above, the bolt shaft 58 and the adjustment guide If the abutment surface of the through hole 60 is not subjected to the processing 58 c and 60 d as described above, the adjustment guide may be used while the compression reaction force of the cushion unit 44 is acting. The bolt shaft 58 pressed into the engaging recess (any one of 60 a to 60 c) of the through hole 60 in the direction against the compression reaction force of the cushion unit 44. In practice, the work must be considerably difficult because the force must be transferred to another engaging recess while maintaining the force.

[0 0 5 4]

In order to deal with such a problem, the present applicant has proposed a structure for adjusting the mounting position of the front end portion 44 a of the cushion unit 44 within the range of the adjustment guide hole 60, as shown in FIG. As shown in FIG. 9 and FIG. 10, each of the left and right mounting brackets 45 is paired. Then, a shaft holding member 80 is provided so as to be movable along the adjustment guide hole 60, and a bolt shaft 5 for supporting the front end portion 44a of the cushion nit '44. By moving the shaft holding member 80 along the adjustment guide hole 60 by supporting the shaft 8 through the adjustment guide hole 60 and the shaft holding member 80, the front end of the cushion unit 44 can be moved. We are also considering a structure that adjusts the mounting position of 44a.

I: 0 0 5 5]

That is, specifically, a flange portion 45 a is further formed on the mounting bracket 45 on which the adjustment guide hole 60 is formed, and the flange portion 80 a is also formed on the shaft holding member 80. After the adjustment bolt 81 fixed to the flange 80 a of the shaft holding member 80 is movably inserted into the flange 45 a of the mounting bracket 45, After connecting the shaft holding member 80 to the mounting bracket 45 by tightening the nut 82, loosen the nut 59 of the bolt shaft 58, and then adjust the bolt By rotating the nut 82 of 1 1, the bolt shaft 58 is moved along with the shaft holding member 80 along the adjustment guide hole 60, and the position of the bolt shaft 58 is adjusted. Tighten the bolt 59 to fix the position of the bolt shaft 58.

[0 0 5 6]

In order to adjust the panel constant (reaction force) of the contact surface of the track belt 11, the position adjustment mechanism using the movable shaft holding member 80 as described above is shown in FIGS. 9 and 10. The rear end of the link member 32 is not limited to the position adjustment of the bolt shaft 58 that supports the front end 44 a of the cushion unit 44 as shown in FIG. It is also possible to adjust the position of the shaft member 39 by applying it to the shaft member 39 connected to the lower end of the link member 33. It may be provided on both of the members 39, or on either one of them, and the specific structure of the shaft holding member 80 that moves along the adjustment guide hole 60 is also described. The design can be changed as appropriate.

[0 0 5 7]

According to the position adjusting mechanism using the movable shaft holding member 80 as described above, the shaft holding member 80 is simply moved along the adjustment guide hole 60, and the panel on the grounding surface of the endless track belt 11 is simply moved. The constant (reaction force) can be easily adjusted, and such a position adjustment Since the positioning mechanism is located below the body frame 3 and faces the side of the vehicle body, the work of position adjustment can be performed with good workability.

[0 0 5 8]

Compared to such a position adjustment mechanism using a movable shaft holding member 80, the cushion according to the present embodiment in which each of the contact surfaces of the bolt shaft 58 and the adjustment guide hole 60 is processed. The adjustment structure of the unit 44 does not require any separate parts such as the shaft holding member 80, and has an extremely simple structure, allowing the mounting position to be adjusted simply by rotating the bolt shaft 58. It can be done easily.

[0 0 5 9 :!

As described above, one embodiment of the cushioning unit adjusting structure of the present invention has been described. The present invention is not limited to the cushioning unit constituting the suspension unit of the snowmobile as shown in the above embodiment. It can also be applied to cushion units used for other purposes.

[0 0 6 0]

Regarding the specific structure, for example, the adjustable mounting portion of the cushion unit is not limited to the mounting portion of the front end portion of the cushion unit, but may be the mounting portion of the rear end portion. Also, it can be carried out even at each of the mounting parts at both ends, and the processing performed on the contact surface between the bolt shaft and the adjustment guide hole does not allow the rotation of the bolt shaft to run idle If such processing is performed, the processing is not limited to the processing such as the serration 58 c and the small groove 60 d specifically shown in the above embodiment.

[0 0 6 1]

【The invention's effect】

According to the cushion unit adjusting structure of the present invention as described above, even if the cushion reaction of the cushion unit is applied to the mounting portion of the cushion unit, the end of the cushion unit can be used. With regard to the bolt shaft fixing the shaft that supports the part, the cushion reaction force of the cushion unit can be reduced by simply performing the extremely simple work of loosening the nut of the bolt shaft and turning the bolt head with a tool or the like. Cushion nits do not require a large force to resist Can be adjusted.

[Brief Description of the Drawings J

【Figure 1】

The side view which shows an example of the snowmobile to which the adjustment structure of the cushion unit of this invention is applied.

【Figure 2】

FIG. 2 is a side view showing a slide rail and a suspension section in a drive track section of the snowmobile shown in FIG. 1.

[Figure 3]

FIG. 3 is a top view showing the left half of the vehicle body with respect to the slide rail and its suspension shown in FIG. 2.

[Fig. 4]

FIG. 2 is a side view showing a connection portion between a main body of a slide rail and a rear end portion of the snowmobile shown in FIG. 1.

[Figure 5]

FIG. 5 is a cross-sectional top view showing a part of a connecting portion between a main body and a rear end portion of the slide rail shown in FIG. 4.

[Fig. 6]

FIG. 4 is a partial cross-sectional top view showing a mounting portion of a front end portion of a cushion unit of a rear suspension portion in the suspension portion shown in FIG. 3.

[Fig. 7]

FIG. 7 is a side view showing an adjustment guide hole of a mounting bracket at a mounting portion at a front end portion of the cushion unit shown in FIG. 6.

[Fig. 8]

One embodiment of the cushioning unit adjustment structure of the present invention using the adjustment guide hole shown in FIG. 7 and the bolt shaft attached to the adjustment guide hole will be described. FIG. 4 is a partial cross-sectional side view showing a shape of processing performed on a contact surface.

[Fig. 9]

Adjust the mounting position of the front end of the cushion unit on a snowmobile. FIG. 7 is a side view showing a comparative example of a structure for adjusting by using FIG.

[Fig. 10]

FIG. 10 is a cross-sectional view of the adjustment structure shown in FIG. 9 taken along line A-A.

[Fig. 11]

FIG. 10 is a side view showing a state in which the adjustment structure shown in FIG. 9 is applied to another part.

[Explanation of symbols]

I snowmobile

3 Body frame

I I Endless track

1 2 — Slide rail

1 5 Front suspension

1 6 Rear suspension

4 4 Cushion unit (for rear suspension)

4 '4 a Front end of the cushion unit

4 5 (Attach the front end of the cushion unit) Mounting bracket

5 5 (supports the front end of the cushion unit) Shaft member

5 8 (Fix the shaft member) Bolt shaft

5 8 c Selection (processing applied to the bolt shaft)

6 0 (Bolt axis is inserted) I Alignment guide hole

60 d small groove (processing performed on the adjustment guide hole)

Claims

[Claims]

At least one end of a cushion unit has a shaft member that supports an end of the cushion unit and supports the shaft member with respect to a pair of mounting brackets. A cushion unit that is fixed so that the position can be adjusted by one bolt shaft and adjustment guide holes formed in each of the mounting brackets to penetrate the bolt shaft. In the adjustment structure of the bolt, the adjustment guide hole on which the compression reaction force of the cushion unit acts and the contact surface of the bolt shaft are processed so that the rotation of the bolt shaft does not run idle with respect to the adjustment guide hole. A cushioning unit adjustment structure characterized by the fact that it has been decorated.

A cushion unit, which is mounted at least on one end via a shaft member whose position can be adjusted, moves a slide rail that guides a lower inner surface of the endless track belt above the slide rail. In a snowmobile in which the front suspension unit and the rear suspension unit suspend the vehicle frame, and the cushion unit of the rear suspension unit is located near the upper inner surface of the endless track belt. 2. The cushion unit adjusting structure according to claim 1, wherein the cushion unit is a cushion unit of a rear suspension portion.

3. A cushion unit in a side view, wherein at least an upper end portion of the cushion unit is covered by a vehicle body frame, and the cushion unit is disposed near an upper inner surface of an endless track belt. 3. The cushion unit adjustment structure according to claim 2, wherein an adjustment guide hole for adjusting a position of the vehicle and a bolt shaft are located below the vehicle body frame and face the side of the vehicle body. .