SK4602000A3 - Universal joint of the wheel swinging arm - Google Patents

Abstract

The nature of a universal joint of a wheel swing arm according to the present invention consists in that the journal (2), equipped with a bearing (1), is a hollow journal (2), while the bearing axis (1') is concurrent or coaxial with the axis of the hollow journal (2'). The bearing (1) may be equipped with at least one tooth (3) and the journal (2) with at least one skew helical slot (4); in that case the bearing axis (1') is coaxial with the journal axis (2'). The bearing (1) and the hollow journal (2) may be radial and cylindrical, while the bearing (1) may be sliding bearing; preferably, the bearing (1) may be cylindrically radial sliding and the hollow journal (2) may be cylindrically radial. If the bearing (1) is equipped with a tooth (3) and the hollow journal (2) with a skew slot (4), the bearing (1) and the hollow journal (2) are stepped.

Description

The invention relates to a universal swivel arm joint for different types of foldable bicycles or motorcycles.

BACKGROUND OF THE INVENTION

The existing design solutions of folding bicycles do not allow the suspension of wheels, which are fastened to the swinging arms.

According to U.S. Pat. No. 5,125,678, the bicycle is folded so that the rear wheel that is not sprung is disassembled, then the seat support is disengaged and finally the chain support that

I unloads when folded and rotates around the center assembly center line to the front fork. Since further assemblies need to be dismantled when folding the bicycle, the entire folding method is lengthy and, moreover, the folded bicycle has a large dimension.

U.S. Pat. No. 4,634,138 discloses folding the rear wheel of a conventional type bicycle by rotating the chain support together with the wheel about the center assembly axis toward the front wheel, i.e.

thus shortening the overall length of the bicycle and lowering the seat and handlebars also reduces its height. After folding the bike has large dimensions, folding is lengthy.

The rear wheel suspension is provided in the folding bicycle described in DE 4313832 A1, where the rear sprung wheel also folds in the joint of the attached fork. This hinge is mounted outside the center assembly axis, thereby generating a considerable length difference between the center assembly axis and the axis of rotation of the wheel when springing and folding the bicycle. The disadvantage of this solution is the large size of the folded bicycle, the spring distance changes the distance between the sprockets.

The disadvantage of the bicycles described so far is that the way they are folded is demanding in terms of expertise, the chain is not covered and therefore the problem of folding the bicycle is a problem, the size of the folded bikes is relatively large even when using small wheels. The hinges used so far do not allow the bike to be folded to the wheel diameter.

Complexly, the folding of the bicycle is solved in the universal type of folding bicycle described in PV 1621-99, which is based on the fact that the front arm and the swinging front arm are connected to each other by a joint and telescopic suspension of the front wheel or mounted front wheel and swinging

-2 ·· ·· ·· ····· · 9 · 9 · 9 · 9999 99 9

9 9 9 9 9 9 9 The rear arm and the rear wheel are articulated with a rear wheel telescopic suspension or rear wheel suspension. The design of the bike allows to assemble various variants of the bike from sports to children's bike with the size of 667 x 667 x 160 mm.

It is an object of the present invention to provide such a swing arm joint solution which allows, for a very simple manner, to fold, for example, a universal type of bicycle into the size of a front or rear wheel with a mudguard.

SUMMARY OF THE INVENTION

The universal joint of the pivot arm consisting of a bearing and a pin is based on the fact that the bearing bearing pin is a hollow pin, the bearing axis being parallel or coaxial with the hollow pin axis. If the bearing axis and the pivot axis are variable, then they may form an angle of from 2 to 7 ° to each other, preferably from 3 to 4.5 °.

The bearing may be provided with at least one tooth and a pin with at least one slanted spiral groove, in which case the bearing axis is coaxial with the pin axis.

The width of the tooth is smaller than the width of the groove but large enough to allow r

smooth tooth sliding.

The bearing and hollow pin may be radial and cylindrical, the bearing may be sliding, preferably the bearing may be cylindrical radially sliding and the hollow pin may be cylindrical radial. If the bearing is provided with a tooth and the hollow pin has a bevelled groove, then the bearing and the hollow pin are stepped.

F

An advantage of the joint according to the invention is its versatility. It can be used for attaching wheel arms to bikes as well as motorcycles. In the case of foldable bicycles, the joint according to the invention makes it possible to mount the front and rear wheels on the swing arm on one side. The articulated joint achieves that the axis of the radial cylindrical roller bearing or the axis of the radial sliding cylindrical roller bearing with the tooth and the axis of the hollow cylindrical cylindrical stepped pin with the inclined groove in which the tooth slides is perpendicular to the bicycle axis and the radial surface of the wheel. Such a joint solution allows the rear wheel to be folded by turning it around the center line of the center frame to the center of gravity of the bicycle frame. In case the stepped bearing is toothed, sliding on the inclined spiral groove axially extends the stepped pin together with the swing arm and the rear wheel.

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The joint design according to the invention is suitable for all types of folding bicycles ranging from children's to adult bikes and from mountain to road bikes. The design of the bicycle allows to fold said variants of bicycles to a size of 667 x 667 x 160 mm in a short period of time. The method of folding a bicycle is simple and requires no expertise.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of embodiments of the invention are shown schematically in the figures. In FIG. 1 is a horizontal cross-sectional view of a central bicycle assembly mounted in a hollow cylindrical pin with a radial cylindrical roller bearing. In FIG. 2 is a horizontal cross-sectional view of a bicycle frame in the axis of a radial stepped cylindrical roller bearing with a tooth, and a hollow radial cylindrical stepped pin with a bevelled groove.

DETAILED DESCRIPTION OF THE INVENTION

The universal knuckle joint as shown in FIG. 1, the axis of the radial cylindrical plain bearing 1 ', which clamps with the axis of the hollow cylindrical journal 21 at an angle of 4 °. In order to better understand the function of the joint, the figure shows the attachment of the radial cylindrical plain bearing X to the bicycle frame 5 and the hollow cylindrical radial pin 2 with the rocker arm 6 of the wheel.

This hinge design allows the wheel to be attached to the swing arm 6, which, when folding, for example, the rear wheel, allows it to rotate about the center assembly axis to the center of gravity of the bicycle frame 5.

In FIG. 2 shows a joint whose radial cylindrical tapered roller bearing 1 is provided with a tooth 3 and the hollow tapered pin 2 is provided with a tapered groove 4. The axis of the radial cylindrical tapered roller bearing 1 'is coaxial with the axis of the hollow cylindrical tapered pin 21.

When the bicycle 3 is folded, the hollow cylindrical radial stepped pin 2 extends axially in the inclined groove 4 together with the pivot arm 6, which rotates about the axis of the radial cylindrical sliding bearing 1 'to the bicycle frame 5.

-4Default usability

The universal joint according to the invention can be used in the production of folding bicycles of various types, from sports to children, with wheels mounted on one side on the swinging arms as well as in the attachment of motorcycle wheels.

Claims (10)

Universal joint of a pivot arm comprising a bearing and a pin, characterized in that the pin (2) provided with the bearing (1) is a hollow pin (2), the bearing axis (1 ') being misaligned or coaxial with the hollow pin axis (2 '). Universal joint according to claim 1, characterized in that the axis of the bearing (1 ') and the axis of the pin (2') form an angle of 2 to 7 relative to each other. Universal joint according to claims 1 and 2, characterized in that the axis of the bearing (1 ') with the axis of the pin (2 *) preferably forms an angle of 3 to 4.5 °. Universal joint according to claim 1, characterized in that the bearing (1) is provided with at least one tooth (3) and the pin (2) is provided with at least one slanted spiral groove (4), the axis of the bearing (1 ') being coaxial with the axis of the pin (2 '). Universal joint according to claim 1 and 4, characterized in that the bearing (1) is preferably provided with three teeth (3) and the pin (2) is preferably provided with three slanted spiral grooves (4). Universal joint according to claim 4 and 5, characterized in that the bearing (1) is provided with at least one tooth (3) and the pin (2) is provided with at least one beveled spiral groove (4), the bearing (1) and the pin (2). ) are stepped. Universal joint according to claims 4 to 6, characterized in that the width of the tooth (3) is smaller than the width of the groove (4), but large enough to allow the tooth (3) to slide smoothly. Universal joint according to claims 1 to 7, characterized in that the bearing (1) and the pin (2) are radial. -69. Universal joint according to claims 1 to 8, characterized in that the bearing (1) and the pin (2) are cylindrical. Universal joint according to Claims 1 to 9, characterized in that the bearing (1) is sliding. Universal joint according to claims 1 to 10, characterized in that the bearing (1) is preferably cylindrically radially sliding and the pin (2) is preferably cylindrical radial.