JPS61163081A - Stabilizer device for snowmobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a stabilizer device for controlling the attitude of a snowmobile when it is running.

[Prior art]

Generally, a snowmobile has a drive track at the rear of the vehicle body and steering skis at the left and right sides of the front. Some vehicle body ψ suspension systems for the above-mentioned steering skis use leaf springs, but in order to further improve riding comfort,
There is one in which telescopic strut-type shock absorbers that can increase the stroke amount are independently interposed on the left and right sides.

However, since the strut type shock absorber has a large stroke, the centrifugal force when the vehicle corners causes the shock absorbers located on the outside of the cornering to contract significantly, and the shock absorbers located on the inside to extends significantly, causing the vehicle body to tilt left and right. Therefore, the snowmobile is provided with a stabilizer device for correcting the above-mentioned left and right tilted posture. Generally, this stabilizer device is configured to transmit the vertical movement of the left and right steering skis to the left and right ends of a torsion rod that is supported across the vehicle body through a link mechanism that converts the vertical movement into a rotation amount.

However, in conventional stabilizer devices, the link mechanism that transmits the vertical movement of the steering ski to the token bar occupies a considerable amount of space and complicates the mechanism, and also reduces the unsprung load on the strut-type shock absorber. and its buffering properties were worsened.

[Purpose of the invention]

An object of the present invention is to provide a stabilizer device for a snowmobile that supports steering skis via a strut-type shock absorber, which can have a compact mechanism, occupy less space, and reduce the unsprung load on the shock absorber. It is about providing.

[Structure of the invention]

The present invention achieves the above object by attaching steering skis to the front left and right sides of the vehicle body through telescopic strut type shock absorbers, and by attaching steering skis to the front left and right sides of the vehicle body, and also attaching steering skis up and down to the steering arm supported on the vehicle body side so as to be rotatable left and right. An upper arm rotatably supported on the
In a snowmobile in which the steering ski can be steered left and right via a scissor link consisting of a lower arm pivotally supported on the steering ski side so as to be pivotable up and down, the upper arm is pivoted relative to the steering arm. The spindle is fixed to the upper arm so as to rotate together with the upper arm, and a torsion rod is connected between the shaft ends of the pivot shaft fixed to the left and right upper arms.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

FIG. 4 shows a snowmobile equipped with a stabilizer device according to the present invention, in which a driving trunk 2 is provided at the rear of the vehicle body 1, and a pair of steering skis 3.3 are provided at the front left and right sides, respectively. It is supported via a strut shock absorber 4.4, which is shown in detail in . Further, the steering ski 3 is connected to the front end of a steering arm 6 that is rotatably supported on the vehicle body 1 side via a scissor link 5 consisting of an upper arm 5a and a lower arm 5b, the details of which are also shown in FIG. is connected to. This steering arm 6 is connected to a steering shaft 9a via a drag link 7 and a focusman arm 8. This steering shaft 9a is rotated left and right by a handle 9 at the upper end, so as to steer the steering skis 3, 3 left and right.

As shown in FIG. 2, the strut type shock absorber 4 has a cylinder 10 filled with oil, and a piston rod 12 integral with a piston 11 fitted into the cylinder 10. The cylinder 10 is supported so as to be slidable in the vertical direction and rotatably about an axis with respect to the support tube 1a that is integral with the vehicle body 1 described above. A cylinder 13 is fixed to the support tube 1a, and the upper end of the piston rod 12 is fixed to the upper end surface of the cylinder 13. Further, a spring receiver 1 is provided at the upper end of the piston rod 12 and at the upper end of the outer periphery of the cylinder 10.
4.15, and a spring 16 is interposed between the spring receivers 14.15. This spring 16 urges the cylinder 10 downward.

A bracket 17 is fixed to the lower end of the cylinder 10, and a steering ski 3 is attached to the bracket 17 so as to be able to swing up and down. A cushioning rubber 19 is interposed between the upper surface of the steering ski 3 that can swing in this manner and the lower surface of the bracket 17.

Further, the above-mentioned steering arm 6 is supported by the support tube 1a, which is integral with the vehicle body 1, so as to be rotatable left and right. An upper arm 5a of the scissor link 5 is pivotally supported at the front end of the steering arm 6 via a pivot shaft 20 so as to be rotatable in the vertical direction.

Further, on the steering ski 3 side, the lower arm 5b of the scissor link 5 is pivoted to the front end of the bracket 17 via a pivot shaft 21 so as to be able to rotate in the same vertical direction.

The upper end of the lower arm 5b and the lower end of the upper arm 5a are rotatably connected via a shaft 22.

As shown in FIG. 3, the pivot shafts 20 and 22 are fixed so as not to rotate relative to the upper arm 5a. Further, the pivot shaft 21 is similarly fixed to the lower arm 5b so as not to rotate relative to it. Therefore, when the cylinder 10 moves up and down with the steering ski 3 with respect to the support tube 1a, that is, when the scissor link 5 expands and contracts as shown by solid lines and chain lines in FIG. rotates integrally with the upper arm 5a.

As shown in FIGS. 1 and 3, a torsion rod 23 is connected between the shaft ends of the pivot shaft 20.20, which rotates integrally with the left and right upper arms 5a, 5a, via a universal joint 24.24. are connected.

Therefore, the rotation of the pivot shaft 20 is transmitted to the torsion rod 23 via the universal joint 24. Further, both the left and right steering arms 6.6 are connected by a tie rod 26 so that they interlock with each other.
When performing left and right steering as shown by solid lines and chain lines in the figure,
The distance between the shaft ends of the pivot shaft 20.20 varies.

In order to absorb this distance change between the shaft ends, a spline 25 is provided between at least one of the two universal joints 24, 24 and the torsion rod 23, and is capable of sliding in the axial direction. It looks like this.

When the above-mentioned snowmobile performs cornering, the outer side of the vehicle body 1 in the cornering direction sinks due to the centrifugal force.
A load is applied to the shock absorber 4 in the direction of contraction. As the upper and lower arms 5a and 5b rotate with the contraction of the shock absorber 4, the pivot shaft 20 rotates with the rotation of the upper arm 5a, and the torsion rod 23 is twisted through the universal joint 24. Empower. The reaction force of the torsion rod 23 against this torsional force acts in a direction to extend the outer shock absorber 4 in the cornering direction, and acts on the inner shock absorber 4 in a direction to contract.

Therefore, the attitude of the vehicle body l, which is about to head in the direction of inclination, is controlled so as to be corrected towards the horizontal direction.

According to the stabilizer device that controls the vehicle body posture described above, unlike conventional devices, an independent link mechanism is not provided as a link mechanism that converts the vertical movement of the steering ski 3 into a rotation amount and transmits it to the torsion rod 23, and the A scissor link 5 provided for steering the direction ski 3 is also used. Therefore, the mechanism is simple and no space is required for an independent link mechanism.

In addition, since an independent link mechanism is not provided, the shock absorber 4
The unsprung load on the vehicle is also reduced.

〔Effect of the invention〕

As described above, the present invention provides for the steering skis to be attached to the front left and right sides of the vehicle body through telescopic strut type shock absorbers, and for the steering skis to be attached vertically to the steering arm supported on the vehicle body side so as to be rotatable left and right. A snowmobile in which the steering ski can be steered left and right through a scissor link consisting of an upper arm rotatably supported on the steering ski side and a lower arm rotatably pivoted up and down on the steering ski side. A pivot shaft of the upper arm for the steering arm is fixed to each other so as to rotate together with the upper arm, and a torsion rod is connected and interposed between the shaft ends of the pivot shaft fixed to the left and right upper arms. With this structure, the link mechanism for converting and transmitting the vertical movement of the steering ski to the amount of rotation to the torsion rod is also used by the scissor link for steering the steering ski, eliminating the need for an independent link mechanism. There is.

Therefore, the occupied space becomes unnecessary, the mechanism becomes compact, and the unsprung load on the shock absorber can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view showing a stabilizer device according to an embodiment of the present invention provided on the snowmobile shown in FIG. 4;
Figure 2 is a vertical cross-sectional view of the strut shock absorber installed on the snowmobile shown in Figure 4, Figure 3 is a view taken along the line mm in Figure 2, and Figure 4 shows the above stabilizer device installed. FIG. 2 is a side view of a snowmobile. DESCRIPTION OF SYMBOLS 1... Vehicle body, 1a... Support pipe, 3... Steering ski, 4... Strut type shock absorber, 5... Scissor link, 5a... Upper arm, 5b... Lower arm , 6... steering arm, 20... pivot shaft,
23... Torsion rod, 24... Universal joint.

Claims (1)

[Claims] Steering skis are attached to the left and right sides of the front of the vehicle through telescopic strut-type shock absorbers, and the steering skis are pivoted vertically to the steering arm, which is supported on the vehicle body so as to be rotatable left and right. Through a scissor link consisting of an arm and a lower arm that is pivotally pivoted up and down on the steering ski side,
In the snowmobile in which the steering ski can be steered left and right, the pivot shaft of the upper arm for the steering arm is fixed to each other so as to rotate together with the upper arm, and the pivot shaft fixed to the left and right upper arms is fixed to each other so as to rotate integrally with the upper arm. A stabilizer device for a snowmobile, characterized in that a torsion rod is connected and interposed between the ends of a support shaft.