A vehicle comprises a frame, a slide rail, and front and rear arms pivotally coupled to the frame and the slide rail. Front and rear shock absorbers are interposed between the slide rail and the frame. A linkage system is coupled with the slide rail, the front arm, and at least one shock absorber.
A vehicle comprises a frame, a slide rail, and front and rear arms pivotally coupled to the frame and the slide rail. Front and rear shock absorbers are interposed between the slide rail and the frame. A linkage system is coupled with the slide rail, the front arm, and at least one shock absorber. The vehicle suspension system becomes increasingly stiffer as the deflection of the slide rail increases, to contribute to a more comfortable ride and to reduce the risk of bottoming-out.
대표청구항▼
What is claimed is: 1. A vehicle comprising: a frame; a slide rail disposed below the frame for guiding a drive track along a road surface; a front arm having a first portion pivotally coupled to the frame at a front frame pivot location and a second portion pivotally coupled to the slide rail at a
What is claimed is: 1. A vehicle comprising: a frame; a slide rail disposed below the frame for guiding a drive track along a road surface; a front arm having a first portion pivotally coupled to the frame at a front frame pivot location and a second portion pivotally coupled to the slide rail at a front rail pivot location; a rear arm having a first portion pivotally coupled to the frame at a rear frame pivot location and a second portion pivotally coupled to the slide rail at a rear rail pivot location; a front shock absorber interposed between the slide rail and the frame; a rear shock absorber interposed between the slide rail and the frame, and a linkage system comprising a first linkage member, a second linkage member, and a third linkage member; wherein a first portion of the first linkage member is coupled to a first portion of the front shock absorber at a first linkage coupling point, a second portion of the first linkage member is pivotally coupled to the slide rail at a second linkage coupling point, a third portion of the first linkage member is coupled to a first portion of the third linkage member at a third linkage coupling point, a first portion of the second linkage member is pivotally coupled to the slide rail at the front rail pivot location, a second portion of the second linkage member is coupled to a second portion of the third linkage member at a fourth linkage coupling point. 2. The vehicle of claim 1, wherein a third portion of the third linkage member is coupled to the rear shock absorber at a fifth linkage coupling point. 3. The vehicle of claim 1, wherein the front rail pivot location, the second linkage coupling point, and the fourth linkage coupling point are arranged such that the distance between the second linkage coupling point and the fourth linkage coupling point changes in a predetermined manner relative to a deflection of the slide rail. 4. The vehicle of claim 1, wherein the front rail pivot location, the second linkage coupling point, and the fourth linkage coupling point are arranged such that a first arc is defined by a constant radius extending from the front rail pivot location to the second linkage coupling point, and a second arc is defined by a variable radius extending from the fourth linkage coupling point to the second linkage coupling point, the radius of the second arc varying according to the amount of deflection of the slide tail, and wherein the first arc and second arc overlap due to the deflection of the slide rail. 5. The vehicle of claim 1, wherein the second linkage coupling point, the third linkage coupling point, and the fourth linkage coupling point are arranged to form a triangle with vertex angles and side lengths such that each stroke of the front and rear shock absorbers, and the direction of each stroke, changes in a predetermined manner. 6. The vehicle of claim 5, wherein the second linkage coupling point, the third linkage coupling point, and the fourth linkage coupling point are arranged such that the vertex angles of the triangle at the second linkage coupling point and at the fourth linkage coupling point are always acute. 7. A vehicle suspension system comprising: a frame; a slide rail; a front arm having a first portion coupled to the frame and a second portion coupled to the slide rail; a rear arm having a first portion coupled to the frame and a second portion coupled to the slide rail; a front shock absorber ranged generally between the frame and the slide rail; a rear shock absorber arranged generally between the frame and the slide rail; and means for coupling the slide rail, the second portion of the front arm, and the front and rear shock absorbers, so that a deflection of the slide rail causes a non-liner increase in the stiffness of the vehicle suspension system. 8. The vehicle suspension system of claim 7, wherein said means causes a shock ratio of the front shock absorber to increase in a generally non-linear fashion as a front portion of the slide rail is deflected. 9. The vehicle suspension system of claim 7, wherein said means causes shock ratios of the front and rear shock absorbers to remain generally constant as the entire slide rail is deflected generally evenly. 10. The vehicle suspension system of claim 7, wherein said means causes a shock ratio of the rear shock absorber to decrease in a generally liner fashion as a rear portion of the slide rail is deflected. 11. A method of operation of a vehicle having a frame, a slide rail disposed below the frame for guiding a drive track along a road surface, a front arm having a first portion pivotally coupled to the frame and a second portion pivotally coupled to the slide rail, a rear arm having a first portion pivotally coupled to the frame and a second portion pivotally coupled to the slide rail, a front shock absorber interposed between the slide rail and the frame, a rear shock absorber interposed between the slide rail and the frame, and a linkage system having a first portion coupled to the front shock absorber at a first location and a second portion coupled to the rear shock absorber at a second location, the method comprising the steps of: deflecting the slide rail within a first range whereby the distance between the first location and the second location decreases; and deflecting the slide rail within a second range whereby the distance between the first location and the second location increases. 12. The method of claim 11, wherein the first range is an initial range of deflection ad the second range is a latter range of deflection. 13. The method of claim 11, wherein the front shock absorber is compressed a first amount during the first range of deflection and the front shock absorber is compressed a second amount during the second range of deflection, the second amount being greater than the first amount. 14. The method of claim 11, wherein the front and rear shock absorbers are compressed approximately the same amount during the first range of deflection. 15. The method of claim 11, wherein the front and rear shock absorbers are compressed approximately the same amount during the second range of deflection.
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이 특허에 인용된 특허 (30)
Peppel Keith W. (Roseau MN) Przekwas Robert W. (Roseau MN) Monsrud Edwin M. (Roseau MN) Bates ; Jr. Richard H. (Badger MN), Adjustable snowmobile track suspension.
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