CA1155153A - Tractor wheel rim - Google Patents
Tractor wheel rimInfo
- Publication number
- CA1155153A CA1155153A CA000314149A CA314149A CA1155153A CA 1155153 A CA1155153 A CA 1155153A CA 000314149 A CA000314149 A CA 000314149A CA 314149 A CA314149 A CA 314149A CA 1155153 A CA1155153 A CA 1155153A
- Authority
- CA
- Canada
- Prior art keywords
- rim
- wheel
- tire
- diameter
- tractor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Tires In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A wheel rim for an agricultural tractor has a central, drum-like cylindrical portion with inwardly projecting circumferential ridges and driver lugs on the ridges to engage clamps on the tractor hub, and outer generally cylindrical or frusto-conical portions, to receive the bead part of the tire, of substantially greater diameter, namely 5-7 inches greater, than the central portion.
Frusto-conical integral intermediate portions join the central portion to the respective outer portions. The arrangement allows a tractor to take a larger tire size, for increased torque, without the necessity of changing all the wheel clamping arrangements on the tractor hub to accommodate a larger rim. The design of frusto-conical intermediate portions also enhances the radial strength of the rim.
A wheel rim for an agricultural tractor has a central, drum-like cylindrical portion with inwardly projecting circumferential ridges and driver lugs on the ridges to engage clamps on the tractor hub, and outer generally cylindrical or frusto-conical portions, to receive the bead part of the tire, of substantially greater diameter, namely 5-7 inches greater, than the central portion.
Frusto-conical integral intermediate portions join the central portion to the respective outer portions. The arrangement allows a tractor to take a larger tire size, for increased torque, without the necessity of changing all the wheel clamping arrangements on the tractor hub to accommodate a larger rim. The design of frusto-conical intermediate portions also enhances the radial strength of the rim.
Description
1:155153 This invention relates to wheel rims, and more particularly to wheel rims for attachment to agricultural tractors.
An agricultrual tractor is provided with rear wheels of very substantial diameter, equipped to receive pneumatic tires of large size with specially designed tread patterns to give traction in wet, soft, muddy conditions encountered in agricultural practices. Until recently, it has been common practice to use tractor rear wheel rims having approximateIy 38 inch diameter at the part receiving the bead of the pneumatic tire, and appropriately sized tires. Recently however, a larger wheel and tire size has been introduced, which has gained popularity on account of the increased traction thereby obtained. This new wheel has approximately 42 inch diameter at the tire bead seating portion. Such wheel rims, and tires to fit them, are now being produced and sold in large quantities, for installation on existing agricultural tractors.
The wheel rim is normally attached to a tractor through the intermediary of a disc-like circular casting which is secured near its center to the driven hub of the tractor, and a series of clamps disposed circumferentially around the outside of the casting. The clamps engage driver lugs provided on the inner circumference of the wheel rim, so as to drive the rim. Thus when the rim size is changed, the entire disc~ e casting arrangement and clamps have to be changed on the tractor also, to accommodate the new wheel ~lS5153 rim size. This makes conversion to the new, larger rim and tire sizes an expensive proposition for the tractor operator, and deters him from taking advantage of the benfits which the larger wheel and tire sizes offer.
Briefly stated, the present invention provides a wheel rim of novel profile. The wheel rim has a central portion, for attachment to driving means on the tractor, and tire bead seat portions of substantially different diameters therefrom, and integral intermediate portions enhancing the strength of the rim to withstand radial forces. The profile thus has a "deep drop" in the center, so as to accommodate mounting formations originally intended for smaller wheel rims and tire sizes, and also to accommodate the desirable larger tire sizes.
Thus according to the present invention, there is provided a wheel rim for an agricultural tractor, said wheel rim comprising:
liSS153 a central generally cylindrical portion having a first diameter;
at least one ridge formation protruding inwardly from said central portion and extending circumferentially around the inner surface thereof;
a plurality of driver lugs on said ridge formation, said driver lugs being spaced apart from one another circumferentially around said ridge formation, and adapted to engage mounting clamp members of the tractor hub for driving of the wheel rim thereby;
first and second generally cylindrical outer rim portions each of a second diameter and each including a radially outwardly presented tire bead seat area;
first and second intermediate rim portions extending respectively from said first outer rim portion to one axial end of the central portion, and from said second outer rim portion to the other axial end of the central portion;
said first diameter being at least 5 inches smal'er 'han said second diameter.
In a preferred embodiment o~ the present inven1..~.hn the first diameter, i.e. that relating to the central cylindrical portion, is rom about 5 inches to about 7 inches smaller than the second diameter, pertaining to the outer rim portions. In such an arrangement, the central cylindrical portion can have a diameter of about 36 inches, the same as the central, mounting portions of conventional rims, which have been standard equipment on agricultural tractors for a number of years, and will llS5~53 consequently ~it the mounting and clam~ing arrangements of a standard tractor, The bead seating area, i.e~ the outer rim portions, can have a diameter of about 42 inches, so as to accommodate the new proposed tire sizes for agricultural tractors.
The intermediate rim portions, extending between the outer rim portions and the inner cylindrical portion, are preferrably frusto-conical, planar and smooth surfaced. It is also preferred that these frusto-conical intermediate rim portions make an angle from about 45 to about 85 with the plane of the central cylindrical portion, when the rim is viewed in cross-sectional profile. In such an arrangement, the integral intermediate portions give added strength to the wheel rim, to resist radially directed forces thereon.
Thus, the central cylindrical portion of the wheel rim of the present invention is of generally conventional form in itself. It is provided with at least one inwardly protruding circumferential ridge, with driver lugs thereon.
Preferably there are at least two such ridges, parallel to ` 20 one another and spaced axially from one another. There can be up to five such ridges, or perhaps more, so as to provide ; alternative axial mounting positions for the rim. Each of the ridges is provided with driver lugs, which suitably comprise inwardly extending protrusions of short circumferential extent. They may be in the form of saddles welded over the ridges at the desired locations, or alternatively embossed on the ridges themselves, so as to connect the rim in driving manner to the wheel casting.
~155153 A specific preferred embodiment of the invention is illustrated in the accompanying dra~ings, in which:
FIGURE 1 is a perspective view, generally from the front, of a tractor wheel rim and mounting arrangement thereof, fitted with a pneumatic tire, generally according to the prior art;
FIGURE 2 is a perspective view of a wheel rim according to the present invention;
FIGURE 3 is a cross-sectional view of the profile of the wheel rim of Fig. 2.
In the drawings, like reference numerals indicate like parts.
~ith reference to Fig~ 1, which shows a conventional ; wheel rim and mounting arrangement, it will be seen that the driven tractor hub 10 has affixed thereto a metal, disc~like casting 12 having a circular periphery, the casting 12 being driven by the hub 10 in response to drive of the hub. The wheel rim generally designated 14 has an inner, generally cylindrical portion 16 carrying thereon two circumferentially extending, inwardly projecting, generally parallel ridges 18, 20. Driver lugs 22, 24 etc. are provided at intervals on the ridges 18, 20, the lugs being welded thereto or integrally embossed on the ridges. The two ridges 18, 20 serve identical functions, namely the driving connection of the rim 14 to the casting 12, and the provision of two similar ridges permits alternative positioning of the wheel rim axially with respect to the tractor hub or axle. The driving connection is effected by means of U-shackles 26, 28 etc., which are releasably bolted to the outer part of the casting 12 by bolts ~155153 30, 32 etc, The legs of the U~shackles 26, 28 etc, protrude outwardly from the perimeter of the casting 12 and engage either side of respective driver lugs such as 22, 24 to attach the rim 14 to the casting 12 ana drive the rim 14 from the casting. Such arrangements are commonly employed in known tractor wheels, and do not require further detailed description herein.
If, however, it is desired to change to a larger wheel rim 14, but one having standard proportions and configuration, so as to accommodate a larger size of tire 33 on the outer perimeter thereof, it will be appreciated that the casting 12, U-shackles 26, 28, bolts 30, 32 etc. must all be changed also to accommodate the new rim. This is a complicated and expensive change, requiring manufacture of new castings and associated apparatus.
i A novel wheel rim according to the present ~,~ invention, to overcome this problem, is shown in Figs. 2 and 3.
~`~ It has a central, generally cylindrical portion 34, i circumferentially around which extend two mutually parallel inwardly projecting ridges 36, 38, each formed integral with the cylindrical portion 34 in the form of "depressions" in ~; the outer surface o~ the cylindrical central portion 34. Both ridges 36 and 38 are provided with inwardly extending driver lugs thereon, such as 40, 42, 44, 46 etc., for engagement with U-shackles of a disc like casting of a tractor wheel such as item 12 shown in Fig. 1. ~he driver lugs are in the form of saddles, welded or embossed transversely across the innermost surface of the ridges 36 and 38, at equally spaced circumferential separations from one another.
1155~53 At each axi~l end of the cylindrical portion 34 are provided integral intermediate rim portions extending axially therefrom, the first such intermediate portion 48 and the second such integral intermediate portion 50 each being smooth surfaced, frusto-conical, and projecting outwardly from the central portion 34 at an angle of about 60 to the plane of the cylindrical portion 34. A configuration involving such an angle enhances the strength of the rim to resist inwardly directed radial forces. As shown in Fig. 3, the intermediate portions 48, 50 have substantial radial extent. At their radially outer edges, they are integral with respective first and second generally cylindrical outer rim portions 52, 54 which have a slight frusto-conical shape, making an angle of about 5 to the plane of the cylindrical portion surface. The extent and angle of the intermediate portions 48, 50 is such that the difference in circumference between the central cylindrical portion 34, and the two similar outer rim portions 52, 54 is about six inches. The upwardly presented circumferential surfaces of the outer rim portions 52, 54 are provided with knurled formations for receiving the bead of a pneumatic tire such as 33 thereon, in the normal way. Outwardly of the intermediate portions 48, 50 the outer rim portions 52, 54 are provided with upstanding flanges 56, 5~, respectively, for retention of a tire thereon, in the usual way.
Thus the invention provides a novel profile and configuration of agricultural tractor wheel rim, which permits the tractor owner to utilize his existing wheel driving equipment, namely casting, U shackles, bolts etc., along with - ? -a larger size of tire~ The owner thus obtains the benefitsof the better torque and traction available by use of the new tire sizes currently being popularized for agricultural tractors, without rendering the change~over unduly inconvenient and e~pensive by forcing change in the driving equipment, The owner merely fits a rim according to the invention on his existing driving equipment.
It will be appreciated that the invention is described herein with reference to the drawings for illustrative purposes of the most preferred embodiment, and is not to be construed as limited thereto. The scope of the invention is limited only by the appended claims.
An agricultrual tractor is provided with rear wheels of very substantial diameter, equipped to receive pneumatic tires of large size with specially designed tread patterns to give traction in wet, soft, muddy conditions encountered in agricultural practices. Until recently, it has been common practice to use tractor rear wheel rims having approximateIy 38 inch diameter at the part receiving the bead of the pneumatic tire, and appropriately sized tires. Recently however, a larger wheel and tire size has been introduced, which has gained popularity on account of the increased traction thereby obtained. This new wheel has approximately 42 inch diameter at the tire bead seating portion. Such wheel rims, and tires to fit them, are now being produced and sold in large quantities, for installation on existing agricultural tractors.
The wheel rim is normally attached to a tractor through the intermediary of a disc-like circular casting which is secured near its center to the driven hub of the tractor, and a series of clamps disposed circumferentially around the outside of the casting. The clamps engage driver lugs provided on the inner circumference of the wheel rim, so as to drive the rim. Thus when the rim size is changed, the entire disc~ e casting arrangement and clamps have to be changed on the tractor also, to accommodate the new wheel ~lS5153 rim size. This makes conversion to the new, larger rim and tire sizes an expensive proposition for the tractor operator, and deters him from taking advantage of the benfits which the larger wheel and tire sizes offer.
Briefly stated, the present invention provides a wheel rim of novel profile. The wheel rim has a central portion, for attachment to driving means on the tractor, and tire bead seat portions of substantially different diameters therefrom, and integral intermediate portions enhancing the strength of the rim to withstand radial forces. The profile thus has a "deep drop" in the center, so as to accommodate mounting formations originally intended for smaller wheel rims and tire sizes, and also to accommodate the desirable larger tire sizes.
Thus according to the present invention, there is provided a wheel rim for an agricultural tractor, said wheel rim comprising:
liSS153 a central generally cylindrical portion having a first diameter;
at least one ridge formation protruding inwardly from said central portion and extending circumferentially around the inner surface thereof;
a plurality of driver lugs on said ridge formation, said driver lugs being spaced apart from one another circumferentially around said ridge formation, and adapted to engage mounting clamp members of the tractor hub for driving of the wheel rim thereby;
first and second generally cylindrical outer rim portions each of a second diameter and each including a radially outwardly presented tire bead seat area;
first and second intermediate rim portions extending respectively from said first outer rim portion to one axial end of the central portion, and from said second outer rim portion to the other axial end of the central portion;
said first diameter being at least 5 inches smal'er 'han said second diameter.
In a preferred embodiment o~ the present inven1..~.hn the first diameter, i.e. that relating to the central cylindrical portion, is rom about 5 inches to about 7 inches smaller than the second diameter, pertaining to the outer rim portions. In such an arrangement, the central cylindrical portion can have a diameter of about 36 inches, the same as the central, mounting portions of conventional rims, which have been standard equipment on agricultural tractors for a number of years, and will llS5~53 consequently ~it the mounting and clam~ing arrangements of a standard tractor, The bead seating area, i.e~ the outer rim portions, can have a diameter of about 42 inches, so as to accommodate the new proposed tire sizes for agricultural tractors.
The intermediate rim portions, extending between the outer rim portions and the inner cylindrical portion, are preferrably frusto-conical, planar and smooth surfaced. It is also preferred that these frusto-conical intermediate rim portions make an angle from about 45 to about 85 with the plane of the central cylindrical portion, when the rim is viewed in cross-sectional profile. In such an arrangement, the integral intermediate portions give added strength to the wheel rim, to resist radially directed forces thereon.
Thus, the central cylindrical portion of the wheel rim of the present invention is of generally conventional form in itself. It is provided with at least one inwardly protruding circumferential ridge, with driver lugs thereon.
Preferably there are at least two such ridges, parallel to ` 20 one another and spaced axially from one another. There can be up to five such ridges, or perhaps more, so as to provide ; alternative axial mounting positions for the rim. Each of the ridges is provided with driver lugs, which suitably comprise inwardly extending protrusions of short circumferential extent. They may be in the form of saddles welded over the ridges at the desired locations, or alternatively embossed on the ridges themselves, so as to connect the rim in driving manner to the wheel casting.
~155153 A specific preferred embodiment of the invention is illustrated in the accompanying dra~ings, in which:
FIGURE 1 is a perspective view, generally from the front, of a tractor wheel rim and mounting arrangement thereof, fitted with a pneumatic tire, generally according to the prior art;
FIGURE 2 is a perspective view of a wheel rim according to the present invention;
FIGURE 3 is a cross-sectional view of the profile of the wheel rim of Fig. 2.
In the drawings, like reference numerals indicate like parts.
~ith reference to Fig~ 1, which shows a conventional ; wheel rim and mounting arrangement, it will be seen that the driven tractor hub 10 has affixed thereto a metal, disc~like casting 12 having a circular periphery, the casting 12 being driven by the hub 10 in response to drive of the hub. The wheel rim generally designated 14 has an inner, generally cylindrical portion 16 carrying thereon two circumferentially extending, inwardly projecting, generally parallel ridges 18, 20. Driver lugs 22, 24 etc. are provided at intervals on the ridges 18, 20, the lugs being welded thereto or integrally embossed on the ridges. The two ridges 18, 20 serve identical functions, namely the driving connection of the rim 14 to the casting 12, and the provision of two similar ridges permits alternative positioning of the wheel rim axially with respect to the tractor hub or axle. The driving connection is effected by means of U-shackles 26, 28 etc., which are releasably bolted to the outer part of the casting 12 by bolts ~155153 30, 32 etc, The legs of the U~shackles 26, 28 etc, protrude outwardly from the perimeter of the casting 12 and engage either side of respective driver lugs such as 22, 24 to attach the rim 14 to the casting 12 ana drive the rim 14 from the casting. Such arrangements are commonly employed in known tractor wheels, and do not require further detailed description herein.
If, however, it is desired to change to a larger wheel rim 14, but one having standard proportions and configuration, so as to accommodate a larger size of tire 33 on the outer perimeter thereof, it will be appreciated that the casting 12, U-shackles 26, 28, bolts 30, 32 etc. must all be changed also to accommodate the new rim. This is a complicated and expensive change, requiring manufacture of new castings and associated apparatus.
i A novel wheel rim according to the present ~,~ invention, to overcome this problem, is shown in Figs. 2 and 3.
~`~ It has a central, generally cylindrical portion 34, i circumferentially around which extend two mutually parallel inwardly projecting ridges 36, 38, each formed integral with the cylindrical portion 34 in the form of "depressions" in ~; the outer surface o~ the cylindrical central portion 34. Both ridges 36 and 38 are provided with inwardly extending driver lugs thereon, such as 40, 42, 44, 46 etc., for engagement with U-shackles of a disc like casting of a tractor wheel such as item 12 shown in Fig. 1. ~he driver lugs are in the form of saddles, welded or embossed transversely across the innermost surface of the ridges 36 and 38, at equally spaced circumferential separations from one another.
1155~53 At each axi~l end of the cylindrical portion 34 are provided integral intermediate rim portions extending axially therefrom, the first such intermediate portion 48 and the second such integral intermediate portion 50 each being smooth surfaced, frusto-conical, and projecting outwardly from the central portion 34 at an angle of about 60 to the plane of the cylindrical portion 34. A configuration involving such an angle enhances the strength of the rim to resist inwardly directed radial forces. As shown in Fig. 3, the intermediate portions 48, 50 have substantial radial extent. At their radially outer edges, they are integral with respective first and second generally cylindrical outer rim portions 52, 54 which have a slight frusto-conical shape, making an angle of about 5 to the plane of the cylindrical portion surface. The extent and angle of the intermediate portions 48, 50 is such that the difference in circumference between the central cylindrical portion 34, and the two similar outer rim portions 52, 54 is about six inches. The upwardly presented circumferential surfaces of the outer rim portions 52, 54 are provided with knurled formations for receiving the bead of a pneumatic tire such as 33 thereon, in the normal way. Outwardly of the intermediate portions 48, 50 the outer rim portions 52, 54 are provided with upstanding flanges 56, 5~, respectively, for retention of a tire thereon, in the usual way.
Thus the invention provides a novel profile and configuration of agricultural tractor wheel rim, which permits the tractor owner to utilize his existing wheel driving equipment, namely casting, U shackles, bolts etc., along with - ? -a larger size of tire~ The owner thus obtains the benefitsof the better torque and traction available by use of the new tire sizes currently being popularized for agricultural tractors, without rendering the change~over unduly inconvenient and e~pensive by forcing change in the driving equipment, The owner merely fits a rim according to the invention on his existing driving equipment.
It will be appreciated that the invention is described herein with reference to the drawings for illustrative purposes of the most preferred embodiment, and is not to be construed as limited thereto. The scope of the invention is limited only by the appended claims.
Claims (4)
1. A wheel for a vehicle to permit use of a wheel disc for a wheel rim intended to support a tire of a first standard diameter with a tire of a second greater standard diameter, said wheel comprising a disc for attachment to a hub of a vehicle and having a radially outer peripheral surface disposed on a diameter corresponding to that used to attach tire rims to support a tire of a first standard diameter; a rim having a pair of circumferentially extending head seats of a diameter corresponding to that used to support a tire of said second standard diameter and a well located between said bead seats, said well having a pair of walls extending radially inwardly from said bead seats to a base, said base having a diameter corresponding to the diameter of said peripheral surface of said disc and connecting means to connect said rim and said disc.
2. A wheel according to claim 1 wherein said radially extending walls are inclined to one another to converge toward said base.
3. A wheel according to claim 2 wherein said connecting means act between said peripheral surface and said base.
4. A wheel rim for use with a vehicle wheel to permit use of a wheel disc for a wheel rim intended to support a tire of a first standard diameter with a tire of a second greater standard diameter, said wheel rim comprising a pair of circumferentially extending bead seats of a diameter corresponding to that used to support a tire of said second standard diameter and a well located between said bead seats, said well having a pair of walls extending radially inwardly from said bead seats to a base, said base having a diameter corresponding to the diameter of a radially outer peripheral surface of a disc intended to support a rim for a tire of a first standard diameter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84461777A | 1977-10-25 | 1977-10-25 | |
| US844,617 | 1977-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1155153A true CA1155153A (en) | 1983-10-11 |
Family
ID=25293226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000314149A Expired CA1155153A (en) | 1977-10-25 | 1978-10-24 | Tractor wheel rim |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1155153A (en) |
-
1978
- 1978-10-24 CA CA000314149A patent/CA1155153A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |