CA1154981A - Composite gear - Google Patents
Composite gearInfo
- Publication number
- CA1154981A CA1154981A CA000365784A CA365784A CA1154981A CA 1154981 A CA1154981 A CA 1154981A CA 000365784 A CA000365784 A CA 000365784A CA 365784 A CA365784 A CA 365784A CA 1154981 A CA1154981 A CA 1154981A
- Authority
- CA
- Canada
- Prior art keywords
- blank
- belt
- gear
- rim
- plastics material
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/30—Chain-wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D15/00—Producing gear wheels or similar articles with grooves or projections, e.g. control knobs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Gears, Cams (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A composite gear or sprocket wheel is described in which the outer toothed portion is formed of a piece of continuously molded flexible gear belt-ing attached to the rim of a gear or sprocket wheel center blank or disc. The outer portion is preferably formed as a plastic belt by a well known continuous molding process. A section of the appropriate length is severed from the endless belt and it is attached by being cemented or snapped into or otherwise fastened to the center blank for providing the outer toothed or sprocket portion for engaging gears, chains or belts.
A composite gear or sprocket wheel is described in which the outer toothed portion is formed of a piece of continuously molded flexible gear belt-ing attached to the rim of a gear or sprocket wheel center blank or disc. The outer portion is preferably formed as a plastic belt by a well known continuous molding process. A section of the appropriate length is severed from the endless belt and it is attached by being cemented or snapped into or otherwise fastened to the center blank for providing the outer toothed or sprocket portion for engaging gears, chains or belts.
Description
~s~9~
The present invention relates to composite gears or sprocket wheels. More particularly, the invention relates to such gears or wheels where the outer teeth or sprocket members, ~or engaging other gears or chains, are formed independently on a gear blank or center portion and are mounted on the rim of the blank to complete the gear or sprocket.
The invention provides a transmission member comprising the combination of an inner blank having a circular outer rim, a strip of molded flexible plastics material substantially equal in length to the circumference of said blank rim and cut from an indeterminate length of the plastics material and fastened around said blank and having radially directed teeth for engagement with cooperating teeth on an interconnected transmission member, said strip of plastics material having longitudinal cord means embedded therein, and said blank having a slot in its rim and said strip of plastics material having radially inwardly projecting locking means locked in said slot.
This invention makes use of known techniques for forming a variety of strips, belts or chains of differing shapes by a continuous plastic extrusion and molding process. Such belts include teeth or sprocket engaging members formed of a plastic body which is reinforced with embedded non-stretchable cable or cording. These belts or chains, with their integral teeth or chain engaging members, provide an inexpensive and effective outer work-ing surface for the gears or sprocket wheels. The central blank is easily molded or otherwise formed of plastic or metal with a smooth or grooved rim to which a section of the belt material is attached. These blanks are rapidly and inexpensivel~ manufactured ~5~
since they require no precision molding or machining of the critical tooth or sprocket portions. The strips for forming the teeth or sprockets, on the other hand, are easily and inexpensively manufactured by known continuous extrusion molding processes, wherein a plastic body portion including precisely ~ormed teeth or sprockets are molded around embedded strengthening members such as metal or fiber reinforcing cords.
Thus, each gear or sprocket in accordance with the invention includes the central gear blank or disc surrounded by an outer working portion comprising a circular section formed of end-less strip, belt or chain cu-t to length and cemented, screwed, snapped or otherwise attached to the blank. The term gear as used herein is meant to designate such generally similar items as years, or sprocket wheels or toothed wheels or the like.
other features of the present invention will become apparent upon an understanding of the illustrative embodiments about to be described or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice.
BRIEF DESCRIPTION OF T~IE DRAWINGS
A preferred embodiment of the invention has been chosen for purposes of illustration and description and is shown in the accompanying drawings, forming a part of the specification, wherein:
Figure 1 is a side elevational view of a continuously molded belt-like member for forming the outer portions of gears or sprocket wheels in accordance with the present invention.
Figure 2 is a vertical sectional view of the member of Figure 1 mounted on a gear blank forming a sprocket wheel.
The present invention relates to composite gears or sprocket wheels. More particularly, the invention relates to such gears or wheels where the outer teeth or sprocket members, ~or engaging other gears or chains, are formed independently on a gear blank or center portion and are mounted on the rim of the blank to complete the gear or sprocket.
The invention provides a transmission member comprising the combination of an inner blank having a circular outer rim, a strip of molded flexible plastics material substantially equal in length to the circumference of said blank rim and cut from an indeterminate length of the plastics material and fastened around said blank and having radially directed teeth for engagement with cooperating teeth on an interconnected transmission member, said strip of plastics material having longitudinal cord means embedded therein, and said blank having a slot in its rim and said strip of plastics material having radially inwardly projecting locking means locked in said slot.
This invention makes use of known techniques for forming a variety of strips, belts or chains of differing shapes by a continuous plastic extrusion and molding process. Such belts include teeth or sprocket engaging members formed of a plastic body which is reinforced with embedded non-stretchable cable or cording. These belts or chains, with their integral teeth or chain engaging members, provide an inexpensive and effective outer work-ing surface for the gears or sprocket wheels. The central blank is easily molded or otherwise formed of plastic or metal with a smooth or grooved rim to which a section of the belt material is attached. These blanks are rapidly and inexpensivel~ manufactured ~5~
since they require no precision molding or machining of the critical tooth or sprocket portions. The strips for forming the teeth or sprockets, on the other hand, are easily and inexpensively manufactured by known continuous extrusion molding processes, wherein a plastic body portion including precisely ~ormed teeth or sprockets are molded around embedded strengthening members such as metal or fiber reinforcing cords.
Thus, each gear or sprocket in accordance with the invention includes the central gear blank or disc surrounded by an outer working portion comprising a circular section formed of end-less strip, belt or chain cu-t to length and cemented, screwed, snapped or otherwise attached to the blank. The term gear as used herein is meant to designate such generally similar items as years, or sprocket wheels or toothed wheels or the like.
other features of the present invention will become apparent upon an understanding of the illustrative embodiments about to be described or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice.
BRIEF DESCRIPTION OF T~IE DRAWINGS
A preferred embodiment of the invention has been chosen for purposes of illustration and description and is shown in the accompanying drawings, forming a part of the specification, wherein:
Figure 1 is a side elevational view of a continuously molded belt-like member for forming the outer portions of gears or sprocket wheels in accordance with the present invention.
Figure 2 is a vertical sectional view of the member of Figure 1 mounted on a gear blank forming a sprocket wheel.
- 2 -' :
, ~5~
Figure 3 is a side elevational view illustrating a sprocket wheel as illustrated in Figure 2 in engagement with an endless chain.
Figure 4 is a fragmentary perspective view of a continuously molded flexible gear belt for use in the gears of the invention.
Figure 5 is a perspective view of a preferred embodiment of a composite gear in accordance with the invention.
Figure 6 is a Eragmen-tary side elevational end view of t}le gear of Figure 5 partially in section.
Figure 7 is a fragmentary perspective view of another embodiment of a continuously molded belt for use with the composite gears of the invention.
Figure 8 is a side elevational view of another embodiment of a con-tinuously molded belt-like member for use in the gear or sprocket wheels of the invention.
Figure 9 is a vertical sectional view of a sprocket wheel having an outer chain engaging member as illustrated in Pigure 8.
Figure lO is a perspective view of a gear in accordance with the invention illustrating a composite gear having an outer toothed belt member attached by a plurality of screws to an inner gear blank or disc.
DESCRIPTION OF TIIE PREFERRED EMBODIMENT
... . ..
Figures 1 through 3 illustrate one embodiment of a composite sprocket wheel 1 in accordance with the invention and formed by the method of the inven-tion. The composite sprocket wheel 1 includes a central blank or disc 2 having a central hub 3 with the usual shaft mounting hole 4. The rim 5 of the blank 2 is provided with an inwardly directed circular slot 6 for engaging the spaced locking projections 7 formed of the molded belt-like me~ber 8 as illustrated in Figure 1. The belt-like member 8 is formed by known extrusion methods whereby a surrounding plastic body portion 9 is extruded and molded surrounding an embedded . . .
~49~
reinforclng cable 10 which ls Eiber or s-teel or a combination thereof. The plastic portion may te nylon or polyurethane or other suitable plastics. The belt-like member 8 includes rounded sprockets or teeth 11 shaped for engaging a particular sprocket chain or belt 12 of the general type illustrated in Figure 2. The bottom portion of the belt-like member body 9 has the identical spaced locklng projectlons 7 for engaging the slok 6 in the blank 2. The projections 7 have a generally truncated pyramidal shape as lllustrated in ~igures 1 and 2 wi-th a central slot 13 providing flexibility for blank mounting and having spaced locking flange portions 14 -for engaging the Eacing circular flanges 15 of the gear blallk slot 6. The composite sprocket wheel 1 is assembled by cutting a length of the belt-like member 8 to the exact length required to encircle the blank 2. Thereafter, this cut portion is snapped into place in the above des-cribed groove 6 with the locking projectlons 7 holding the short section of the belt-like member 8 in position. ~hile the section of belt 8 may require no additional fastening, it is also possible that the facing ends may be either welded or cemented or otherwise fastened together and to the gear blank 2.
Figures 4, 5 and 6 illustrate another embodiment more particularly useful as a gear 20 for engaging other gears or appropriately toothed belts or chains. This embodiment employs a generally similar central gear blank or disc 21 having a hub 22 and a mounting hole 23. Figure 4 lllustrates a portion of a continuously extruded and molded flexible gear belt 24 having molded teeth 25.
The belt 24 is also formed by kno~n continuous molding processes and includes a molded plastic body portion 26 reinforced by a pair of cords 27 of fiber or steel or a combination fiber and steel. The gear 2Q is also assembled by cutting an appropriate length from the belt 2~ which will encircle the outer generally cylindrical rim 28 of the gear blank 21 in the manner illustrated in Figures 5 and 6. In this case, the portion of the belt 24 is cemented or otherwise a98~L
fastened to the outer rim 28 Oe the gear blank 21 to form the completed compos-ite gear 20.
Figure 7 illustrates another embodiment of an extruded belt 30 for use as the outer portion of a composite gear. This also is a flexible molded belt with teeth 31 similar to a timing belt or other belt and having a molded plastic body 32 with embedded flexible cords 33. This embodiment has spaced apertures 3~ for use with mounting screws or pins Eor attaching it to a gear blank. It also illustrates another form o:E tooth having spaced projecting side flanges 35 which are useful in certain applications for acting as side guides for a timing belt or other belt.
Figure 8 illustrates another embodiment of a belt ~0 which has the general form of spur gear stock. The belt 40 has the usual plastic molded body 41 with reinforcing embedded cords~ 42 (Figure 91- Spaced spur teeth or sprockets 43 extend from ~he body 41 of the belt 40. Figure 9 illustrates the belt 40 cut to encircle a spur gear blank 44 where the outer ~ortion of the belt 40 is cemented into an appropriate circular groove 45 at the rim of the blank 44.
Figure 10 illustrates a composite gear 50 employing screw fastenings 51 for holding the outer toothed belt portion 52 in place on a gear blank 53.
It will be seen that an improved composite gear or sprocket wheel has been described ~hich is formed from a novel combination of an extruded belt-like plastic member with a gear blank. This novel combination is particularly advan-tageous as it permits the inexpensive manufacture of gearing and also permits gears or sprocket wheels to be manufactured with a wide variety of differing si~es, shapes, and specifications as needed and in either large or small numbers as required at a given time for use with other transmission memberssuch as gears or belts of chains and the like.
As various changes may be made in the -form, construction and arrange-_ 5 _ ment of the parts herein without sacrificing any o~ its advantages, it is to be understood that all matter herein is to be interpreted as illustrative and not in a limiting sense.
.,, ~,
, ~5~
Figure 3 is a side elevational view illustrating a sprocket wheel as illustrated in Figure 2 in engagement with an endless chain.
Figure 4 is a fragmentary perspective view of a continuously molded flexible gear belt for use in the gears of the invention.
Figure 5 is a perspective view of a preferred embodiment of a composite gear in accordance with the invention.
Figure 6 is a Eragmen-tary side elevational end view of t}le gear of Figure 5 partially in section.
Figure 7 is a fragmentary perspective view of another embodiment of a continuously molded belt for use with the composite gears of the invention.
Figure 8 is a side elevational view of another embodiment of a con-tinuously molded belt-like member for use in the gear or sprocket wheels of the invention.
Figure 9 is a vertical sectional view of a sprocket wheel having an outer chain engaging member as illustrated in Pigure 8.
Figure lO is a perspective view of a gear in accordance with the invention illustrating a composite gear having an outer toothed belt member attached by a plurality of screws to an inner gear blank or disc.
DESCRIPTION OF TIIE PREFERRED EMBODIMENT
... . ..
Figures 1 through 3 illustrate one embodiment of a composite sprocket wheel 1 in accordance with the invention and formed by the method of the inven-tion. The composite sprocket wheel 1 includes a central blank or disc 2 having a central hub 3 with the usual shaft mounting hole 4. The rim 5 of the blank 2 is provided with an inwardly directed circular slot 6 for engaging the spaced locking projections 7 formed of the molded belt-like me~ber 8 as illustrated in Figure 1. The belt-like member 8 is formed by known extrusion methods whereby a surrounding plastic body portion 9 is extruded and molded surrounding an embedded . . .
~49~
reinforclng cable 10 which ls Eiber or s-teel or a combination thereof. The plastic portion may te nylon or polyurethane or other suitable plastics. The belt-like member 8 includes rounded sprockets or teeth 11 shaped for engaging a particular sprocket chain or belt 12 of the general type illustrated in Figure 2. The bottom portion of the belt-like member body 9 has the identical spaced locklng projectlons 7 for engaging the slok 6 in the blank 2. The projections 7 have a generally truncated pyramidal shape as lllustrated in ~igures 1 and 2 wi-th a central slot 13 providing flexibility for blank mounting and having spaced locking flange portions 14 -for engaging the Eacing circular flanges 15 of the gear blallk slot 6. The composite sprocket wheel 1 is assembled by cutting a length of the belt-like member 8 to the exact length required to encircle the blank 2. Thereafter, this cut portion is snapped into place in the above des-cribed groove 6 with the locking projectlons 7 holding the short section of the belt-like member 8 in position. ~hile the section of belt 8 may require no additional fastening, it is also possible that the facing ends may be either welded or cemented or otherwise fastened together and to the gear blank 2.
Figures 4, 5 and 6 illustrate another embodiment more particularly useful as a gear 20 for engaging other gears or appropriately toothed belts or chains. This embodiment employs a generally similar central gear blank or disc 21 having a hub 22 and a mounting hole 23. Figure 4 lllustrates a portion of a continuously extruded and molded flexible gear belt 24 having molded teeth 25.
The belt 24 is also formed by kno~n continuous molding processes and includes a molded plastic body portion 26 reinforced by a pair of cords 27 of fiber or steel or a combination fiber and steel. The gear 2Q is also assembled by cutting an appropriate length from the belt 2~ which will encircle the outer generally cylindrical rim 28 of the gear blank 21 in the manner illustrated in Figures 5 and 6. In this case, the portion of the belt 24 is cemented or otherwise a98~L
fastened to the outer rim 28 Oe the gear blank 21 to form the completed compos-ite gear 20.
Figure 7 illustrates another embodiment of an extruded belt 30 for use as the outer portion of a composite gear. This also is a flexible molded belt with teeth 31 similar to a timing belt or other belt and having a molded plastic body 32 with embedded flexible cords 33. This embodiment has spaced apertures 3~ for use with mounting screws or pins Eor attaching it to a gear blank. It also illustrates another form o:E tooth having spaced projecting side flanges 35 which are useful in certain applications for acting as side guides for a timing belt or other belt.
Figure 8 illustrates another embodiment of a belt ~0 which has the general form of spur gear stock. The belt 40 has the usual plastic molded body 41 with reinforcing embedded cords~ 42 (Figure 91- Spaced spur teeth or sprockets 43 extend from ~he body 41 of the belt 40. Figure 9 illustrates the belt 40 cut to encircle a spur gear blank 44 where the outer ~ortion of the belt 40 is cemented into an appropriate circular groove 45 at the rim of the blank 44.
Figure 10 illustrates a composite gear 50 employing screw fastenings 51 for holding the outer toothed belt portion 52 in place on a gear blank 53.
It will be seen that an improved composite gear or sprocket wheel has been described ~hich is formed from a novel combination of an extruded belt-like plastic member with a gear blank. This novel combination is particularly advan-tageous as it permits the inexpensive manufacture of gearing and also permits gears or sprocket wheels to be manufactured with a wide variety of differing si~es, shapes, and specifications as needed and in either large or small numbers as required at a given time for use with other transmission memberssuch as gears or belts of chains and the like.
As various changes may be made in the -form, construction and arrange-_ 5 _ ment of the parts herein without sacrificing any o~ its advantages, it is to be understood that all matter herein is to be interpreted as illustrative and not in a limiting sense.
.,, ~,
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A transmission member comprising the combination of an inner blank having a circular outer rim, a strip of molded flexible plastics material substantially equal in length to the circumference of said blank rim and cut from an indeterminate length of the plastics material and fastened around said blank and having radially directed teeth for engagement with cooperating teeth on an inter-connected transmission member, said strip of plastics material having longitudinal cord means embedded therein, and said blank having a slot in its rim and said strip of plastics material having radially inwardly projecting locking means locked in said slot.
2. The transmission member as claimed in claim 1 in which said slot includes tooth like depressions and said locking means comprises teeth engaging said depressions.
3. The transmission member as claimed in claim 1 in which said locking means comprises longitudinal flanges.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9839379A | 1979-11-29 | 1979-11-29 | |
| US98,393 | 1979-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1154981A true CA1154981A (en) | 1983-10-11 |
Family
ID=22269088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000365784A Expired CA1154981A (en) | 1979-11-29 | 1980-11-28 | Composite gear |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1154981A (en) |
| GB (1) | GB2064708B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT215967Z2 (en) * | 1988-10-04 | 1991-03-20 | Stagnoli Di Stagnoli Laurina O | MODULAR RACKS IN NYLON PRINTED ON A METALLIC SOUL. |
| DE3833989A1 (en) * | 1988-10-06 | 1990-04-12 | Bosch Gmbh Robert | Pinion gear component with a main body and a flexible toothed element surrounding the latter |
| FR2663390A1 (en) * | 1990-06-18 | 1991-12-20 | Bredeau Serge | Method making it possible to simplify the manufacture of gearing teeth |
| BE1009470A3 (en) * | 1995-06-27 | 1997-04-01 | Picanol Nv | Toothed wheel for driving GRAB A BAND in a weaving machine. |
| DE19653967A1 (en) * | 1996-12-21 | 1998-06-25 | Krupp Foerdertechnik Gmbh | Method for fabricating toothed rack or body with inner or outer toothing |
| DE19757186A1 (en) * | 1997-12-22 | 1999-06-24 | Schaeffler Waelzlager Ohg | Manufacturing hollow cylindrical internal and external gears |
| US5911788A (en) * | 1998-02-20 | 1999-06-15 | Sundstrand Corporation | Compliant gear |
| WO2003089813A1 (en) * | 2002-04-16 | 2003-10-30 | The Gates Corporation | Composite sprocket |
| RU2310116C2 (en) | 2003-07-22 | 2007-11-10 | Дзе Гейтс Корпорейшн | Motorcycle suspension system and sprocket used in said system |
| DE102012105372A1 (en) * | 2012-06-20 | 2013-12-24 | Webasto Ag | Drive system for vehicle chassis cover element mounted in vehicle roof of passenger car, has reinforcing band that extends to neutral axis of drive cables, such that height of tooth of cables is less than half the diameter of cables |
| CN104534057A (en) * | 2014-12-19 | 2015-04-22 | 广东特固力士工业皮带有限公司 | Synchronous belt gear, gear rack thereof and preparation method of gear rack |
| ES2906056T3 (en) | 2019-02-28 | 2022-04-13 | Ims Gear Se & Co Kgaa | Gear rim support part for a two- or multi-component gear wheel, as well as a two- or multi-component gear wheel with such a rim gear support part |
| GB2583538B (en) * | 2019-05-03 | 2024-02-28 | Polar Tech Management Group Limited | Connector arrangement |
-
1980
- 1980-11-28 CA CA000365784A patent/CA1154981A/en not_active Expired
- 1980-12-01 GB GB8038436A patent/GB2064708B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2064708B (en) | 1983-07-13 |
| GB2064708A (en) | 1981-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |