CA2288577A1 - Hub assembly for chain sprockets - Google Patents
Hub assembly for chain sprockets Download PDFInfo
- Publication number
- CA2288577A1 CA2288577A1 CA 2288577 CA2288577A CA2288577A1 CA 2288577 A1 CA2288577 A1 CA 2288577A1 CA 2288577 CA2288577 CA 2288577 CA 2288577 A CA2288577 A CA 2288577A CA 2288577 A1 CA2288577 A1 CA 2288577A1
- Authority
- CA
- Canada
- Prior art keywords
- sprocket
- hub
- cylindrical member
- central aperture
- cylindrical
- 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.)
- Abandoned
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- Gears, Cams (AREA)
Abstract
A hub for a chain sprocket includes an annular member with a portion having a cylindrical exterior surface. There is a flange adjacent the surface which extends radially outward therefrom. The hub preferably includes a central cylindrical member with a central aperture.
The annular member is connected to the cylindrical member. The hub is connected to a selected sprocket having a central aperture such that the cylindrical surface extends through the aperture and the flange butts up against the sprocket. The annular member is welded to the sprocket.
The annular member is connected to the cylindrical member. The hub is connected to a selected sprocket having a central aperture such that the cylindrical surface extends through the aperture and the flange butts up against the sprocket. The annular member is welded to the sprocket.
Description
~1 HUB ASSEMBLY FOR CHAIN SPROCKETS
This invention relates to chain sprockets and, in particular, to chain sprockets having interchangeable hub assemblies, whereby a sprocket can fit different-sized shafts.
BACKGROUND OF THE INVENTION
Chain sprockets are utilized in many industrial operations. Sprockets come in various sizes having different outside diameters, different numbers of teeth and central apertures designed to fit different diameters of shafts and different types of shafts. This has meant that industrial operations and distributors of sprockets must stock many different configurations of sprockets. This takes up considerable space and ties up a large amount of money in stock.
For many types of operations there are comparatively few common types of hubs.
Typically four to six sizes can fit up to 75% of the applications in a particular plant.
There may be different variations of hubs such as nylon-bushed, standard key inset screw, adjustable and split. The sprockets however may have to fit different types of chains, such as roller chains and mill chains. A typical plant may have, for example, six sizes of roller chains and six types of mill chains. Sprockets having between seven and sixty teeth may be required for each type of chain.
It would be desirable to reduce the amount of stock by providing sprockets which can be adapted for different diameters of shafts and different types of shafts.
United States Patent No. 2,673,471 to Klein discloses a chain sprocket with a welded hub.
The hub allows for mounting of various-size sprockets on shafts of varying diameters.
United States Patent No. 2,932,207 shows a similar arrangement, with a cylindrical hub.
This invention relates to chain sprockets and, in particular, to chain sprockets having interchangeable hub assemblies, whereby a sprocket can fit different-sized shafts.
BACKGROUND OF THE INVENTION
Chain sprockets are utilized in many industrial operations. Sprockets come in various sizes having different outside diameters, different numbers of teeth and central apertures designed to fit different diameters of shafts and different types of shafts. This has meant that industrial operations and distributors of sprockets must stock many different configurations of sprockets. This takes up considerable space and ties up a large amount of money in stock.
For many types of operations there are comparatively few common types of hubs.
Typically four to six sizes can fit up to 75% of the applications in a particular plant.
There may be different variations of hubs such as nylon-bushed, standard key inset screw, adjustable and split. The sprockets however may have to fit different types of chains, such as roller chains and mill chains. A typical plant may have, for example, six sizes of roller chains and six types of mill chains. Sprockets having between seven and sixty teeth may be required for each type of chain.
It would be desirable to reduce the amount of stock by providing sprockets which can be adapted for different diameters of shafts and different types of shafts.
United States Patent No. 2,673,471 to Klein discloses a chain sprocket with a welded hub.
The hub allows for mounting of various-size sprockets on shafts of varying diameters.
United States Patent No. 2,932,207 shows a similar arrangement, with a cylindrical hub.
United States Patent No. 5,806,373 discloses a method of manufacturing a gear.
The hub is cylindrical.
United States Patent No. 2,436,694 shows a detachable sprocket wheel. It is mounted on a hub by bolts.
Traditional sprocket assemblies, such as disclosed in United States Patent No.
2,673,461, are limited to roller chain-style sprockets only and require a wide variety of hole sizes in the sprocket plate to accommodate different types of available hubs. In addition the system does not allow for field-welding of sprockets. Problems may be encountered due to bore distortion by heat which occurs during welding.
Accordingly, it is an object of the invention to provide an improved hub for a chain sprocket which is capable of fitting a number of different sprockets and mounting such sprockets on different sizes and configurations of shafts.
It is also an object of the invention to provide an improved sprocket assembly which includes a sprocket and a hub which can be welded to the sprocket in order to adapt the sprocket to different sizes of shafts.
SUMMARY OF THE INVENTION
There is provided, according to one aspect of the invention, a hub for a chain sprocket. The hub includes a cylindrical member with a central aperture and an annular adapter connected to the cylindrical member and having a portion with a cylindrical exterior surface. There is a flange adjacent to the surface which extends radially outward therefrom. The annular adapter has a central aperture fitting over the cylindrical member.
~
The hub is cylindrical.
United States Patent No. 2,436,694 shows a detachable sprocket wheel. It is mounted on a hub by bolts.
Traditional sprocket assemblies, such as disclosed in United States Patent No.
2,673,461, are limited to roller chain-style sprockets only and require a wide variety of hole sizes in the sprocket plate to accommodate different types of available hubs. In addition the system does not allow for field-welding of sprockets. Problems may be encountered due to bore distortion by heat which occurs during welding.
Accordingly, it is an object of the invention to provide an improved hub for a chain sprocket which is capable of fitting a number of different sprockets and mounting such sprockets on different sizes and configurations of shafts.
It is also an object of the invention to provide an improved sprocket assembly which includes a sprocket and a hub which can be welded to the sprocket in order to adapt the sprocket to different sizes of shafts.
SUMMARY OF THE INVENTION
There is provided, according to one aspect of the invention, a hub for a chain sprocket. The hub includes a cylindrical member with a central aperture and an annular adapter connected to the cylindrical member and having a portion with a cylindrical exterior surface. There is a flange adjacent to the surface which extends radially outward therefrom. The annular adapter has a central aperture fitting over the cylindrical member.
~
There is provided, according to another aspect of the invention, a sprocket assembly. The assembly includes a sprocket having a central aperture and a hub for the sprocket. The hub has an annular adapter with a portion having a cylindrical exterior surface.
The exterior surface is complementary in shape to the central aperture of the sprocket.
There is a flange adjacent to the surface and extending radially outward therefrom. There is a cylindrical member with a central aperture, the annular adapter fitting over the cylindrical member and being connected to the cylindrical member. For example, the cylindrical member may be welded to the annular adapter or connected to the annular adapter by fasteners such as bolts.
Preferably the hub is welded to the sprocket.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Figure 1 is a top plan view of a sprocket assembly according to an embodiment of the invention;
Figure 2 is an exploded plan view thereof;
Figure 3 is a front elevation of the sprocket thereof;
Figure 4 is a front elevation of the annular adapter thereof;
Figure 5 is a sectional view taken along line 5-5 of Figure 4;
Figure 6 is a top plan view, partly in section, of the hub thereof;
The exterior surface is complementary in shape to the central aperture of the sprocket.
There is a flange adjacent to the surface and extending radially outward therefrom. There is a cylindrical member with a central aperture, the annular adapter fitting over the cylindrical member and being connected to the cylindrical member. For example, the cylindrical member may be welded to the annular adapter or connected to the annular adapter by fasteners such as bolts.
Preferably the hub is welded to the sprocket.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Figure 1 is a top plan view of a sprocket assembly according to an embodiment of the invention;
Figure 2 is an exploded plan view thereof;
Figure 3 is a front elevation of the sprocket thereof;
Figure 4 is a front elevation of the annular adapter thereof;
Figure 5 is a sectional view taken along line 5-5 of Figure 4;
Figure 6 is a top plan view, partly in section, of the hub thereof;
Figure 7 is a sectional view of the hub;
Figure 8 is a top plan view of a hub according to an alternative embodiment of the invention;
and Figure 9 is a front elevation of the hub of Figure 8.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings, and first to Figures 1-7, these show a sprocket assembly 10 according to an embodiment of the invention. The sprocket assembly includes a sprocket 12 and a hub 14 which, in this embodiment, includes a cylindrical member 16 and an adapter 18. The adapter is an annular member having a portion 20 with a cylindrical external surface 22 and a flange 24 adjacent to the surface. The flange extends radially outwards from the surface.
The cylindrical member 16 in this embodiment is in two semi-cylindrical segments 30 and 32 which are connected together about central aperture 38 as seen in Figure 7.
The central aperture is sized to fit a particular shaft. The two segments of member 16 are connected together, in this case by a plurality of bolts 40. The bolts are threadedly received in complementary threaded apertures 42 which, in this example, are in segment 30.
Other types of fasteners or means of connecting the segments together could be utilized in alternative embodiments.
The sprocket 12 has a central aperture 50, as seen in Figure 3, which is sized so as to closely receive cylindrical surface 22 of the annular member. For example, the aperture 50 may be 7" in diameter with the diameter of cylindrical portion 22 being slightly less so as to tightly fit the aperture. The sprocket is typically selected from a plurality of different sprockets having a common sized aperture S0.
Figure 8 is a top plan view of a hub according to an alternative embodiment of the invention;
and Figure 9 is a front elevation of the hub of Figure 8.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings, and first to Figures 1-7, these show a sprocket assembly 10 according to an embodiment of the invention. The sprocket assembly includes a sprocket 12 and a hub 14 which, in this embodiment, includes a cylindrical member 16 and an adapter 18. The adapter is an annular member having a portion 20 with a cylindrical external surface 22 and a flange 24 adjacent to the surface. The flange extends radially outwards from the surface.
The cylindrical member 16 in this embodiment is in two semi-cylindrical segments 30 and 32 which are connected together about central aperture 38 as seen in Figure 7.
The central aperture is sized to fit a particular shaft. The two segments of member 16 are connected together, in this case by a plurality of bolts 40. The bolts are threadedly received in complementary threaded apertures 42 which, in this example, are in segment 30.
Other types of fasteners or means of connecting the segments together could be utilized in alternative embodiments.
The sprocket 12 has a central aperture 50, as seen in Figure 3, which is sized so as to closely receive cylindrical surface 22 of the annular member. For example, the aperture 50 may be 7" in diameter with the diameter of cylindrical portion 22 being slightly less so as to tightly fit the aperture. The sprocket is typically selected from a plurality of different sprockets having a common sized aperture S0.
The cylindrical member 16 in this embodiment has a flange 60 with a plurality of elongated slots 62, shown best in Figure 7, in this particular example. Each of these slots receives a bolt 66, shown in Figure 1 and Figure 2. The bolts are threadedly received in threaded apertures 70 in the annular adapter. The elongated slots allow adjustment of the annular member 18 in relation to the cylindrical member 16. The bolts are tightened when the proper angular position is achieved.
Figures 8 and 9 show an alternative embodiment of the hub where like parts have like numbers as in Figure 1, with the additional designation ".3". In this case, hub 14.3 is a two-piece hub in two segments 30.3 and 32.3 which are bolted together by bolts 40.3 about central aperture 38.3. As shown in Figure 8, the half cylindrical member 16.3 and half annular adapter 18.3 of each segment is a one-piece assembly.
Another embodiment, not shown, is similar to that of Figures 8 and 9. However the hub is in one piece instead of two segments and the bolts are eliminated.
For each of the embodiments the annular member is welded to a selected sprocket with the flange against the sprocket. For example, with respect to the embodiment of Figures 1 - 7, the annular adapter 22 is inserted through aperture 50 of a selected sprocket 12 until the flange 24 butts up against the sprocket. The sprocket is then welded to the annular member about the flange 24. For the embodiment of Figure 8 the sprocket is welded about flange 24.3.
It will be understood by someone skilled in the art that many of the details provided above are by way of example only and are not intended to limit the scope of the invention which is to be interpreted with reference to the following claims.
Figures 8 and 9 show an alternative embodiment of the hub where like parts have like numbers as in Figure 1, with the additional designation ".3". In this case, hub 14.3 is a two-piece hub in two segments 30.3 and 32.3 which are bolted together by bolts 40.3 about central aperture 38.3. As shown in Figure 8, the half cylindrical member 16.3 and half annular adapter 18.3 of each segment is a one-piece assembly.
Another embodiment, not shown, is similar to that of Figures 8 and 9. However the hub is in one piece instead of two segments and the bolts are eliminated.
For each of the embodiments the annular member is welded to a selected sprocket with the flange against the sprocket. For example, with respect to the embodiment of Figures 1 - 7, the annular adapter 22 is inserted through aperture 50 of a selected sprocket 12 until the flange 24 butts up against the sprocket. The sprocket is then welded to the annular member about the flange 24. For the embodiment of Figure 8 the sprocket is welded about flange 24.3.
It will be understood by someone skilled in the art that many of the details provided above are by way of example only and are not intended to limit the scope of the invention which is to be interpreted with reference to the following claims.
Claims (13)
1. A hub for a chain sprocket, comprising:
a cylindrical member with a central aperture; and an annular adapter connected to the cylindrical member and having a portion with a cylindrical exterior surface, a flange adjacent to the surface which extends radially outward therefrom and a central aperture fitting over the cylindrical member.
a cylindrical member with a central aperture; and an annular adapter connected to the cylindrical member and having a portion with a cylindrical exterior surface, a flange adjacent to the surface which extends radially outward therefrom and a central aperture fitting over the cylindrical member.
2. A hub as claimed in Claim 1, wherein the cylindrical member is welded to the annular member.
3. A hub as claimed in Claim 1, wherein the cylindrical member is connected to the annular adapter by fasteners.
4. A hub as claimed in Claim 3, wherein at least one of the cylindrical member and the annular member has elongated apertures, the fasteners passing through the apertures, whereby the annular adapter can be adjusted relative to the cylindrical member when the fasteners are loose.
5. A hub as claimed in Claim 4, wherein the fasteners are bolts.
6. A hub as claimed in Claim 1, having two segments, the segments being bolted together about the central aperture.
7. A sprocket assembly comprising:
a sprocket having a central aperture; and a hub connected to the sprocket, the hub having an annular adapter with a portion having a cylindrical exterior surface complementary in shape to the central aperture of the sprocket, the cylindrical surface extending through the central aperture of the sprocket, a flange adjacent to the surface and extending radially outward therefrom, the flange contacting the sprocket, and a cylindrical member having a central aperture, the annular adapter fitting over the cylindrical member and being connected to the cylindrical member.
a sprocket having a central aperture; and a hub connected to the sprocket, the hub having an annular adapter with a portion having a cylindrical exterior surface complementary in shape to the central aperture of the sprocket, the cylindrical surface extending through the central aperture of the sprocket, a flange adjacent to the surface and extending radially outward therefrom, the flange contacting the sprocket, and a cylindrical member having a central aperture, the annular adapter fitting over the cylindrical member and being connected to the cylindrical member.
8. An assembly as claimed in Claim 7, wherein the annular adapter is welded to the sprocket.
9. A sprocket assembly as claimed in Claim 7, wherein the cylindrical member is welded to the annular adapter.
10. A sprocket assembly as claimed in Claim 7, wherein the cylindrical member is connected to the annular adapter by fasteners.
11. A sprocket assembly as claimed in Claim 10, wherein at least one of the cylindrical member and the annular adapter has elongated apertures, the fasteners passing through the apertures, whereby the annular member can be adjusted relative to the cylindrical member when the fasteners are loose.
12. A sprocket assembly as claimed in Claim 11, wherein the fasteners are bolts.
13. A sprocket assembly as claimed in Claim 12, wherein the hub is in two segments, the segments being bolted together about the central aperture.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43392699A | 1999-11-04 | 1999-11-04 | |
| US09/433,926 | 1999-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2288577A1 true CA2288577A1 (en) | 2001-05-04 |
Family
ID=23722107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2288577 Abandoned CA2288577A1 (en) | 1999-11-04 | 1999-11-08 | Hub assembly for chain sprockets |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2288577A1 (en) |
-
1999
- 1999-11-08 CA CA 2288577 patent/CA2288577A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |