SEGMENTED WHEEL

Abstract

There is described a wheel for use with an endless track system, the wheel comprising at least three substantially identical segments. Each of the segments comprising a support portion, a circumferential flange, and a rim portion. The rim portion is affixed to an outer face of the circumferential flange.

Claims

1. A wheel for use with an endless track system, the wheel comprising: at least three substantially identical segments, wherein each of the segments comprises a support portion, a circumferential flange, and a rim portion; wherein the rim portion is affixed to an outer face of the circumferential flange.

2. The wheel of claim 1, wherein the rim portion comprises an elastomer.

3. The wheel of claim 1, wherein the rim portion is bonded to the outer face.

4. The wheel of claim 1, wherein the segments are configured to attach to each other to form the wheel.

5. The wheel of claim 1, wherein each segment defines an inner edge configured for attachment to a hub portion or an axle flange.

6. The wheel of claim 5, wherein the inner edge is configured to be bolted to the hub portion or axle flange.

7. The wheel of claim 1, wherein each segment is configured to be bolted to each adjacent segment.

8. The wheel of claim 1, wherein each segment includes corresponding interlocking formations configured to join each segment to an adjacent segment.

9. The wheel of claim 1, wherein each segment further comprises an inner face, and wherein the inner face is provided with a debris ejection formation at the interface of two segments.

10. The wheel of claim 1, wherein the rim portion further comprises an exterior face for contact with an endless track, wherein the exterior face comprises a plurality of grooves configured to eject debris caught between the wheel and endless track.

11. The wheel of claim 10, wherein the plurality of grooves are arranged such that a groove at the interface of two segments bridges the adjacent segments uninterrupted.

12. A segmented wheel, comprising: at least three substantially identical wheel segments, each having a support portion connected to an arcuate flange, and a rim portion affixed to an outer face of the flange.

13. The segmented wheel of claim 12, wherein the rim portion comprises an elastomer.

14. The segmented wheel of claim 12, wherein each of the at least three wheel segments is configured to interlock with another of the at least three wheel segments.

15. A method of forming a wheel, the method comprising: providing at least three substantially identical wheel segments comprising a support portion and a circumferential flange; affixing a rim portion to an outer face of the circumferential flange; and connecting the wheel segments together to form a substantially circular wheel.

16. The method of claim 15, wherein affixing a rim portion to an outer face of the circumferential flange comprises molding an elastomer to the circumferential flange.

17. The method of claim 15, wherein affixing a rim portion to an outer face of the circumferential flange comprises pressing an elastomer to the circumferential flange.

18. The method of claim 15, wherein connecting the wheel segments together comprises interlocking the wheel segments.

19. The method of claim 15, further comprising bolting each wheel segment to two adjacent segments.

20. The method of claim 15, further comprising bolting each wheel segment to a hub.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0041] FIG. 1 is a perspective view of a segmented wheel according to a first embodiment;

[0042] FIG. 2 is a partially exploded view of the wheel of FIG. 1;

[0043] FIG. 3 is a perspective view of a segmented wheel according to a further embodiment;

[0044] FIG. 4 is an exploded view of the wheel of FIG. 3;

[0045] FIG. 5 is a close up view of the wheel of FIG. 3;

[0046] FIG. 6 is a further close up view of the wheel of FIG. 3;

[0047] FIG. 7 is an end view of a segment of the wheel of FIG. 3;

[0048] FIG. 8 is a side view of the segment of FIG. 7;

[0049] FIG. 9 is a perspective view of the segment of FIG. 7; and

[0050] FIG. 10 is a further perspective view of the segment of FIG. 7.

DETAILED DESCRIPTION

[0051] The drawings are provided by way of reference only, and will be acknowledged as not to scale.

[0052] FIG. 1 and FIG. 2 show a wheel 10 for an endless track system. In this embodiment the wheel 10 has three segments 12.

[0053] Each of the segments 12 is substantially identical.

[0054] Each segment 12 comprises a support portion 14 and a rim portion 18.

[0055] The support portion 14 is an annular sector in shape having a central connection portion 20, a body portion 22, an outer portion 24, and a circumferential flange 16.

[0056] The central connection portion 20 is configured for connection to an axle flange or the like by any suitable means, for example by bolts inserted through bolt holes 26 and attached to an axle flange or hub (not shown). Alternatively the connection portion 20 may be connected to a hub disc (not shown) which is in turn attached to an axle.

[0057] The body portion 22 extends radially outward from the central connection portion 20, becoming the outer portion 24. In this specific example, the body portion 22 is substantially flat; in other examples, the body portion 22 may include localized thickening of material for strengthening and/or apertures to reduce the overall segment 12 weight.

[0058] The circumferential flange 16 comprises an inner face 28, an outer face 30 and an interface portion 32 at each end of the circumferential flange 16. The circumferential flange 16 extends seamlessly from the outer portion 24 substantially perpendicularly to the plane of the body portion 22.

[0059] The outer face 30 provides a surface for attachment of the rim portion 18 and faces away from the axis of rotation of the wheel 10.

[0060] Each interface portion 32 abuts with the interface portion 32 of an adjacent segment 12 when the segments 12 are connected to form the wheel 10. The interface portion 32 in this specific example includes corresponding chamfered faces 34 and fastener holes 36 for bolts.

[0061] The interface portion 32 may include any suitable means for securing adjacent segments 12 together, for example welding, riveting, or adhesive bonding.

[0062] The inner face 28 faces toward the axis of rotation of the wheel 10.

[0063] The inner face 28 includes debris ejectors 38. The debris ejectors 38 are configured to urge debris collecting on the inner face 28 away from the plane of the body portion 22, thereby helping to reduce debris accumulation on the wheel 10. In this example, the debris ejectors 38 bridge the interface portion 32 of the circumferential flange 16; however, in other examples the debris ejectors 38 may be provided on the inner face 28 distanced from the interface portions 32, or may be omitted entirely. In this specific example, the debris ejectors 38 provide for localized thickening and strengthening of the circumferential flange 16 thereby strengthening the fastener holes 36 and therefore the arrangement of the segments 12 when connected to form the wheel 10.

[0064] The support portion 14 and the circumferential flange 16 in this specific example are a single metallic component, for example pressed mild steel; however, they may be two separate components which are joined together or a single spun or molded or pressed component. It will be understood that any suitable forming process may be used.

[0065] The rim portion 18 is of an elastomeric material and is attached using any suitable means to the outer face 30 of the circumferential flange 16.

[0066] In use, the wheel 10 is mounted to a vehicle, for example an agricultural tractor, the wheel 10 either supporting and/or driving an endless belt system to propel the vehicle. The rim portion 18 contacts the inside face of an endless track (not shown).

[0067] Since the wheel 10 is constructed of segments, the molds used to apply the rim portion 18 to the support portion 14 can be much smaller than the mold size that would be required to apply a rim portion 18 to a wheel that was not constructed of sub-segments.

[0068] By reducing the size of molds and tooling required to apply the rim portion 18 to the support portion 14, the overall cost of manufacture of the wheel 10 can be reduced.

[0069] With reference to FIGS. 3 through 10, a further embodiment is shown. A wheel 110 for an endless track system comprises five segments 112 and a hub portion 113, which is also known as a hub disc.

[0070] The hub portion 113 is generally disc shaped and comprises a number of fastener holes suitable for the attachment of the segments 112 to the disc. The hub portion 113 includes a central flange 170, which is provided for the attachment of the hub portion 113 and thereby the wheel 110 to the axle (not shown) of a vehicle.

[0071] Each of the five segments 112 is substantially identical and each comprises a support portion 114 and a rim portion 118. Although five segments 112 are shown in this embodiment, it will be understood that fewer or more segments may be used depending on the application and preferred construction of the wheel 110.

[0072] The support portions 114 comprise a central connection portion 120, a body portion 122, an outer portion 124, and a circumferential flange 116.

[0073] The central connection portion 120 is configured for connection to the hub portion 113 by any suitable means, for example bolts 125 inserted through bolt holes 126. Washers 127 may be held under the head of the bolts 125 in a conventional manner.

[0074] The body portion 122 extends radially outward from the central connection portion 120, terminating at the outer portion 124, thereby forming an arcuate member. In this specific example, the body portion 122 includes localized thickening 129 of material for strengthening in proximity to the bolt holes 126.

[0075] The circumferential flange 116 comprises an inner face 128, an outer face 130, and an interface portion 132 at each end of the circumferential flange 116. The circumferential flange 116 is in this embodiment an extension of the outer portion 124 extending substantially perpendicularly to the plane of the body portion 122 and outer portion 124.

[0076] The outer face 130 provides a surface for attachment of the rim portion 118 and is orientated to face away from the axis of rotation of the wheel 110.

[0077] Each interface portion 132 in this specific example includes corresponding, interlocking formations 150. The interlocking formations 150 are best seen individually in FIGS. 9 and 10 and in FIG. 6, which shows the interlocking formations 150 in an engaged position. In the engaged position, the tongue 152 of one segment 112 interlocks with the groove 154 of another segment 112 to secure adjacent segments 112 relative to each other.

[0078] The inner face 128 may include debris ejectors 138. The debris ejectors 138 are configured to propel debris that may collect on the inner face 128 out of the wheel 110 and away from a vehicle, thereby helping to reduce debris accumulation on the wheel 110. With reference to FIG. 5, the debris ejectors 138 are formed from two parts, one on either side of the interface portion 132 of the circumferential flange 116. However, in other examples, the debris ejectors 138 may be provided on the inner face 128 away from the interface portions 132, or may be omitted entirely. In this specific example, the debris ejectors 138 are formed from localized thickening of the circumferential flange 116 and also act to strengthen the interface between adjacent segments 112.

[0079] The support portion 114 and the circumferential flange 116 are in this embodiment a single component of pressed mild steel; however, they may be two separate components which are joined together or a single spun or molded or pressed component. It will be understood that any suitable forming process may be used to manufacture the support portions 114.

[0080] The rim portion 118 is affixed to the outer surface 130 by any suitable means, for example by over molding or bonding. Generally the rim portion 118 is constructed of an elastomeric material.

[0081] In this example, the rim portion 118 includes a tread pattern 160 which may be for example molded or cut into the rim portion 118. The tread pattern 160 comprises a regular series of troughs 162 and peaks 164. The tread pattern 160 is arranged such that debris that may be caught between the rim portion 118 and a track when the wheel 110 is in use is ejected so as to avoid damage to the wheel 110, and a track which rides upon the wheel 110. The tread pattern 160 is so arranged that when the segments 114 are attached to one another to form a wheel 110, the tread pattern 160 continues uninterrupted over the interfaces of adjacent segments 114; this is best seen in FIG. 6 at reference 166. In other words, the tread pattern 160 can be profiled to be continuous once the segments 112 are assembled into a wheel 110.

[0082] The invention is not limited to the embodiments or examples described herein, and may be modified or adapted without departing from the scope of the present disclosure.