CA2129791A1 - Roller bearing for a movable flange - Google Patents
Roller bearing for a movable flangeInfo
- Publication number
- CA2129791A1 CA2129791A1 CA 2129791 CA2129791A CA2129791A1 CA 2129791 A1 CA2129791 A1 CA 2129791A1 CA 2129791 CA2129791 CA 2129791 CA 2129791 A CA2129791 A CA 2129791A CA 2129791 A1 CA2129791 A1 CA 2129791A1
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- sleeve
- bearing
- roller
- rollers
- 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
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
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The roller bearing for use in a movable flange in a variable-speed belt drive, the movable flange being movable along a shaft coaxial therewith. The bearing comprises at least three outer roller-tracks symmetrically disposed around the shaft and longitudinal extending thereon; a sleeve positioned around the shaft and coaxial therewith, the sleeve being rigidly connected to the movable flange and having inner roller-tracks respectively facing the outer roller-tracks; at least two spaced-apart rollers rotatable and snugly engaged between each outer roller-track and the corresponding inner roller-track for supporting the sleeve in a spaced-relationship around the shaft while allowing axial movement of the sleeve along the shaft; and a bearing cage mounted between the shaft and the sleeve for guiding the rollers.
Description
ROLLER BEARING FOR A MOVABLE FLANGE
FIELD OF THE INVENTION
S The present invention relates to a roller bearing for a movable flange in a variable-speed belt drive adapted to receive a trapezoidal belt by which power is transmitted from the driving pulley to a driven pulley.
BACKGROUND OF THE INVENTION
Variable-speed belt drives are commonly used on small vehicles such as snowmobiles, scooters or small cars. Such belt drives substantially comprise a driving pulley, a trapezoidal belt and a driven pulley. The driving pulley is linked to an engine and the driven pulley is usually mechanically connected to ground traction means, such as wheels or tracks.
The main object of using a variable-speed belt drive is to automatically change the winding diameter of the driving and the driven pulleys in order to have a maximum torque at low speeds and a reasonable engine rotation speed at high speeds. The sides of the trapezoidal belt are, on each pulley, gripped between two opposite flanges wherein one is fixed and one is movable. At low speeds, the winding diameter of the driving pulley is small and the winding diameter of the driven pulley is maximum. As the rotation speed of the driving pulley increases, sliding flyweights, located between radially converging ramps facing each other, are subjected to an increasing outward force pushing the ramps away from each other. This axial thrust generated by the flyweights is counterbalanced by biasing means, such as a helicoidal spring mounted around the shaft of the driving pulley, which biases the movable flange away from the fixed flange. As the axial thrust pushes the movable flange towards the fixed flange, the spring is further compressed.
" 212~791 The movement of the movable flange stops when the axial thrust becomes substantially e~ual to the opposite biasing force.
When the rotation speed of the engine decreases, the winding diameter of the driving pulley decreases since the movable flange of the driving pulley moves back away from the fixed flange because the biasing force is then more important than the axial thrust of the flyweights. The movement of the movable flange stops when the axial thrust becomes substantially equal to the opposite biasing force.
An example of a driving pulley in a variable-speed belt drive is disclosed in U.S. patents nos. 3,659,470 and 5,052,981, and also in Canadian patent no. 1,212,559.
One of the drawbacks of conventional driving pulleys is that the sliding movement of the movable flange is often very difficult under in high loads because the friction may be important in spite of the usual annular bearings. This affects the reaction time of the pulleys and alters the calibration thereof.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a roller bearing that is adapted to be used with the movable flange in a variable-speed belt drive.
More particularly, the object of the present invention is to provide a roller bearing for a movable flange in a variable-speed belt drive, the movable flange being movable along a shaft coaxial therewith, the bearing comprising:
at least three outer roller-tracks symmetrically disposed around the shaft and longitudinal extending thereon;
a sleeve positioned around the shaft and coaxial therewith, the sleeve being rigidly connected to the movable flange and having inner roller-tracks respectively facing the outer roller-tracks;
at least two spaced-apart rollers rotatable and snugly engaged between each outer roller-track and the corresponding inner roller-track for supporting the sleeve in a spaced-relationship around the shaft while allowing axial movement of the sleeve along the shaft; and a bearing cage mounted between the shaft and the sleeve for guiding the rollers.
A non restrictive description of a preferred embodiment will now be given with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. lA is a cross-sectional view of a driving pulley with a movable flange mounted on the shaft according to the prior art.
FIG. lB is a cross-sectional view of a driving pulley with a movable flange mounted on the shaft with a bearing according to the present invention.
FIG. 2 is a cross-sectional view of a bearing according to the present invention.
FIG. 3 is a cross-sectional view of a sleeve according to the present invention.
FIG. 4 is a cross-sectional view of a bearing cage according to the present invention.
FIG. 5 is a cross-sectional view of an inner bearing set around the shaft for allowing rotation of the movable flange with respect of the shaft, according to the present invention.
DESCRIPTION OF A PREFERRED EMBODIMENT
As shown in the figures, the roller bearing is for a movable flange in a variable-speed belt drive, the movable flange being movable along a shaft coaxial therewith. The bearing comprises at least three outer roller-tracks 21297~1 symmetrically disposed around the shaft and longitudinal extending thereon, a sleeve positioned around the shaft and coaxial therewith, the sleeve being rigidly connected to the movable flange and having inner roller-tracks respectively facing the outer roller-tracks; at least two spaced-apart rollers rotatable and snugly engaged between each outer roller-track and the corresponding inner roller-track for supporting the sleeve in a spaced-relationship around the shaft while allowing axial movement of the sleeve along the shaft; and a bearing cage mounted between the shaft and the sleeve for guiding the rollers.
The number of rollers in more than two, at least two juxtaposed rollers between each outer roller-track and the corresponding inner roller-track being proximate a region where a radial inward force on the shaft is maximum.
The bearing cage may comprise a sleeve provided with a plurality of apertures in which are set the rollers.
The bearing cage may be made of brass or plastic.
Additionally, an inner sleeve with axially extending rollers engaged with the shaft may be provided around the shaft for allowing rotation of the movable flange with respect of the shaft. The axial rollers are then engaged with the outer surface of the inner sleeve.
Although a preferred embodiment of the invention has been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to this precise embodiment and that various changes and modifications may be effected therein without departing from the scope or spirit of the invention.
FIELD OF THE INVENTION
S The present invention relates to a roller bearing for a movable flange in a variable-speed belt drive adapted to receive a trapezoidal belt by which power is transmitted from the driving pulley to a driven pulley.
BACKGROUND OF THE INVENTION
Variable-speed belt drives are commonly used on small vehicles such as snowmobiles, scooters or small cars. Such belt drives substantially comprise a driving pulley, a trapezoidal belt and a driven pulley. The driving pulley is linked to an engine and the driven pulley is usually mechanically connected to ground traction means, such as wheels or tracks.
The main object of using a variable-speed belt drive is to automatically change the winding diameter of the driving and the driven pulleys in order to have a maximum torque at low speeds and a reasonable engine rotation speed at high speeds. The sides of the trapezoidal belt are, on each pulley, gripped between two opposite flanges wherein one is fixed and one is movable. At low speeds, the winding diameter of the driving pulley is small and the winding diameter of the driven pulley is maximum. As the rotation speed of the driving pulley increases, sliding flyweights, located between radially converging ramps facing each other, are subjected to an increasing outward force pushing the ramps away from each other. This axial thrust generated by the flyweights is counterbalanced by biasing means, such as a helicoidal spring mounted around the shaft of the driving pulley, which biases the movable flange away from the fixed flange. As the axial thrust pushes the movable flange towards the fixed flange, the spring is further compressed.
" 212~791 The movement of the movable flange stops when the axial thrust becomes substantially e~ual to the opposite biasing force.
When the rotation speed of the engine decreases, the winding diameter of the driving pulley decreases since the movable flange of the driving pulley moves back away from the fixed flange because the biasing force is then more important than the axial thrust of the flyweights. The movement of the movable flange stops when the axial thrust becomes substantially equal to the opposite biasing force.
An example of a driving pulley in a variable-speed belt drive is disclosed in U.S. patents nos. 3,659,470 and 5,052,981, and also in Canadian patent no. 1,212,559.
One of the drawbacks of conventional driving pulleys is that the sliding movement of the movable flange is often very difficult under in high loads because the friction may be important in spite of the usual annular bearings. This affects the reaction time of the pulleys and alters the calibration thereof.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a roller bearing that is adapted to be used with the movable flange in a variable-speed belt drive.
More particularly, the object of the present invention is to provide a roller bearing for a movable flange in a variable-speed belt drive, the movable flange being movable along a shaft coaxial therewith, the bearing comprising:
at least three outer roller-tracks symmetrically disposed around the shaft and longitudinal extending thereon;
a sleeve positioned around the shaft and coaxial therewith, the sleeve being rigidly connected to the movable flange and having inner roller-tracks respectively facing the outer roller-tracks;
at least two spaced-apart rollers rotatable and snugly engaged between each outer roller-track and the corresponding inner roller-track for supporting the sleeve in a spaced-relationship around the shaft while allowing axial movement of the sleeve along the shaft; and a bearing cage mounted between the shaft and the sleeve for guiding the rollers.
A non restrictive description of a preferred embodiment will now be given with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. lA is a cross-sectional view of a driving pulley with a movable flange mounted on the shaft according to the prior art.
FIG. lB is a cross-sectional view of a driving pulley with a movable flange mounted on the shaft with a bearing according to the present invention.
FIG. 2 is a cross-sectional view of a bearing according to the present invention.
FIG. 3 is a cross-sectional view of a sleeve according to the present invention.
FIG. 4 is a cross-sectional view of a bearing cage according to the present invention.
FIG. 5 is a cross-sectional view of an inner bearing set around the shaft for allowing rotation of the movable flange with respect of the shaft, according to the present invention.
DESCRIPTION OF A PREFERRED EMBODIMENT
As shown in the figures, the roller bearing is for a movable flange in a variable-speed belt drive, the movable flange being movable along a shaft coaxial therewith. The bearing comprises at least three outer roller-tracks 21297~1 symmetrically disposed around the shaft and longitudinal extending thereon, a sleeve positioned around the shaft and coaxial therewith, the sleeve being rigidly connected to the movable flange and having inner roller-tracks respectively facing the outer roller-tracks; at least two spaced-apart rollers rotatable and snugly engaged between each outer roller-track and the corresponding inner roller-track for supporting the sleeve in a spaced-relationship around the shaft while allowing axial movement of the sleeve along the shaft; and a bearing cage mounted between the shaft and the sleeve for guiding the rollers.
The number of rollers in more than two, at least two juxtaposed rollers between each outer roller-track and the corresponding inner roller-track being proximate a region where a radial inward force on the shaft is maximum.
The bearing cage may comprise a sleeve provided with a plurality of apertures in which are set the rollers.
The bearing cage may be made of brass or plastic.
Additionally, an inner sleeve with axially extending rollers engaged with the shaft may be provided around the shaft for allowing rotation of the movable flange with respect of the shaft. The axial rollers are then engaged with the outer surface of the inner sleeve.
Although a preferred embodiment of the invention has been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to this precise embodiment and that various changes and modifications may be effected therein without departing from the scope or spirit of the invention.
Claims (6)
1. A roller bearing for a movable flange in a variable-speed belt drive, the movable flange being movable along a shaft coaxial therewith, the bearing comprising:
at least three outer roller-tracks symmetrically disposed around the shaft and longitudinal extending thereon;
a sleeve positioned around the shaft and coaxial therewith, the sleeve being rigidly connected to the movable flange and having inner roller-tracks respectively facing the outer roller-tracks;
at least two spaced-apart rollers rotatable and snugly engaged between each outer roller-track and the corresponding inner roller-track for supporting the sleeve in a spaced-relationship around the shaft while allowing axial movement of the sleeve along the shaft; and a bearing cage mounted between the shaft and the sleeve for guiding the rollers.
at least three outer roller-tracks symmetrically disposed around the shaft and longitudinal extending thereon;
a sleeve positioned around the shaft and coaxial therewith, the sleeve being rigidly connected to the movable flange and having inner roller-tracks respectively facing the outer roller-tracks;
at least two spaced-apart rollers rotatable and snugly engaged between each outer roller-track and the corresponding inner roller-track for supporting the sleeve in a spaced-relationship around the shaft while allowing axial movement of the sleeve along the shaft; and a bearing cage mounted between the shaft and the sleeve for guiding the rollers.
2. A bearing according to claim 1, wherein the number of rollers in more than two, at least two juxtaposed rollers between each outer roller-track and the corresponding inner roller-track being proximate a region where a radial inward force on the shaft is maximum.
3. A bearing according to claim 1, wherein the bearing cage comprises a sleeve provided with a plurality of apertures in which are set the rollers.
4. A bearing according to claim 3, wherein the bearing cage is made of brass.
5. A bearing according to claim 3, wherein the bearing cage is made of plastic.
6. A bearing according to claim 1, further comprising an inner sleeve with axially extending rollers engaged with the shaft may be provided around the shaft for allowing rotation of the movable flange with respect of the shaft, the axial rollers being engaged with the outer surface of the inner sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2129791 CA2129791A1 (en) | 1994-08-09 | 1994-08-09 | Roller bearing for a movable flange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2129791 CA2129791A1 (en) | 1994-08-09 | 1994-08-09 | Roller bearing for a movable flange |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2129791A1 true CA2129791A1 (en) | 1996-02-10 |
Family
ID=4154142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2129791 Abandoned CA2129791A1 (en) | 1994-08-09 | 1994-08-09 | Roller bearing for a movable flange |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2129791A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9500264B2 (en) | 2014-03-31 | 2016-11-22 | Bombardier Recreational Products Inc. | Continuously variable transmission drive pulley |
| US10066729B2 (en) | 2014-03-31 | 2018-09-04 | Bombardier Recreational Products Inc. | Continuously variable transmission drive pulley |
| US11306809B2 (en) | 2018-11-28 | 2022-04-19 | Bombardier Recreational Products Inc. | Drive pulley for a continuously variable transmission |
-
1994
- 1994-08-09 CA CA 2129791 patent/CA2129791A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9500264B2 (en) | 2014-03-31 | 2016-11-22 | Bombardier Recreational Products Inc. | Continuously variable transmission drive pulley |
| US9933064B2 (en) | 2014-03-31 | 2018-04-03 | Bombardier Recreational Products Inc. | Continuously variable transmission drive pulley |
| US10066729B2 (en) | 2014-03-31 | 2018-09-04 | Bombardier Recreational Products Inc. | Continuously variable transmission drive pulley |
| US11306809B2 (en) | 2018-11-28 | 2022-04-19 | Bombardier Recreational Products Inc. | Drive pulley for a continuously variable transmission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |