US3822610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traction roller transmission with torque loading means
Assignee: Individual
•
Filing: 1972-08-31
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Granted: 1974-07-09
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Expires: 1992-08-31
Abstract
Abstract This invention relates to traction roller transmissions with infinitely variable driving ratio, which are especially designed for the propulsion of automotive vehicles. In order to compete with presently used drives, an infinitely variable transmission must have a high efficiency of over 95 percent and a long service fatigue life when operating over long time periods at full engine power. Presently known designs can not meet these requirements. The transmission here disclosed is based on a novel concept and design and will deliver full engine power at 97 to 98 percent efficiency over the upper ratio range, including top speed ratio, and has a service fatigue life of over 100,000 vehicular miles. These results are achieved for a toric race and roller drive having a torque loading device for maintaining the required pressure in the tractive roller contacts by the combination with the torque load device of a novel planetary torque-split device, causing a preselected modification of the axial pressure forces and their characteristic over the entire ratio range; reducing the axial pressures produced by the torque load device only for the upper part of the speed ratio range also reduces the losses of power in the tractive rolling contacts, thereby increasing the efficiency and the service fatigue life of the toric rollers and races. FIG. 7 and text give details of this modification of the axial pressure characteristic as against the characteristic obtained by a conventional torque load device.
Inventors
- 👤 R Erban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:00
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H37/086; F16H13/00; F16H13/10; F16H13/14; F16H37/10; F16H2037/101
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
301 words
A traction transmission comprising a variable ratio toric race and roller system and a fixed ratio planetary system having a plurality of planetary rollers between several races coaxially aligned with said toric races system, a driving, a driven and an intermediate shaft, a carrier for said planetary rollers connected to said driven shaft, both races of said toric system free to rotate relatively to each other upon said intermediate shaft, one of said toric races connected to one of said planetary races, the other planetary race connected to said intermediate shaft, a torque loading device coaxial upon said shaft, comprising two discs rotatable relative to each other, each disc having a plurality of torque cams arranged facing the torque cams of the other disc, a plurality of balls between opposing cams, one of said torque cam-discs connected to the other of said toric races for rotation therewith, the other torque cam-disc connected to said intermediate shaft, and each of said cam-discs provided on its periphery with a spur gear, a plurality of planetary pinion gears arranged in pairs surrounding said spur gears, a ring shaped extension of said driving shaft having pins for rotatably supporting said pinion gears so that in each pair the pinion gears mesh with each other and each pinion gear will independently mesh with one of the spur gears of the torque camdiscs, causing the torque from the driving shaft to be split ineo two components of preselected size, one of which is delivered to the torque cam-disc connected to the toric race, and the other delivered to the torque cam-disc connected to the intermediate shaft, whereby the characteristic of the axial pressure generated by this differential torque loading device is made to follow closely the optimum curve over a selected part of the speed ratio range.
Claim 2
Dependent Claim
301 words
A traction transmission comprising a variable ratio toric race and roller system and a fixed ratio planetary system having a plurality of planetary rollers between several races coaxially aligned with said toric races system, a driving, a driven and an intermediate shaft, a carrier for said planetary rollers connected to said driven shaft, both races of said toric system free to rotate relatively to each other upon said intermediate shaft, one of said toric races connected to one of said planetary races, the other planetary race connected to said intermediate shaft, a torque loading device coaxial upon said shaft, comprising two discs rotatable relative to each other, each disc having a plurality of torque cams arranged facing the torque cams of the other disc, a plurality of balls between opposing cams, one of said torque cam-discs connected to the other of said toric races for rotation therewith, the other torque cam-disc connected to said intermediate shaft, and each of said cam-discs provided on its periphery with a spur gear, a plurality of planetary pinion gears arranged in pairs surrounding said spur gears, a ring shaped extension of said driving shaft having pins for rotatably supporting said pinion gears so that in each pair the pinion gears mesh with each other and each pinion gear will independently mesh with one of the spur gears of the torque camdiscs, causing the torque from the driving shaft to be split ineo two components of preselected size, one of which is delivered to the torque cam-disc connected to the toric race, and the other delivered to the torque cam-disc connected to the intermediate shaft, whereby the characteristic of the axial pressure generated by this differential torque loading device is made to follow closely the optimum curve over a selected part of the speed ratio range.
Claim 3
Dependent Claim
203 words
In a traction roller transmission, having a driving, a driven and an intermediate shaft, and comprising a fixed ratio planetary race and roller system having two concentric races coaxial with a variable ratio toric race and roller system having first and second races and including a torque load device having two disc with multiple torque cams, one of said torque cam-discs connected to the first of said toric races and the other connected through the intermediate shaft to one of said planetary races, the other planetary race connected to the second of said toric races for free rotation therewith about said intermediate shaft the combination of the torque load device with a planetary differential torque split device comprising two orbit gears and planetary pinion gears rotatably carried by a flange of said driving shaft and meshing with both of said orbit gears, one of which is connected to said first toric race and the other to said intermediate shaft, whereby the torque of the driving shaft is delivered in two independent components of predetermined size to both of said cam-discs of the torque loading device, to effect a predetermined modulation of the characteristic of the axial pressure generated by the torque load device.
Claim 4
Dependent Claim
203 words
In a traction roller transmission, having a driving, a driven and an intermediate shaft, and comprising a fixed ratio planetary race and roller system having two concentric races coaxial with a variable ratio toric race and roller system having first and second races and including a torque load device having two disc with multiple torque cams, one of said torque cam-discs connected to the first of said toric races and the other connected through the intermediate shaft to one of said planetary races, the other planetary race connected to the second of said toric races for free rotation therewith about said intermediate shaft the combination of the torque load device with a planetary differential torque split device comprising two orbit gears and planetary pinion gears rotatably carried by a flange of said driving shaft and meshing with both of said orbit gears, one of which is connected to said first toric race and the other to said intermediate shaft, whereby the torque of the driving shaft is delivered in two independent components of predetermined size to both of said cam-discs of the torque loading device, to effect a predetermined modulation of the characteristic of the axial pressure generated by the torque load device.
Claim 5
Dependent Claim
261 words
In a traction roller transmission comprising a variable ratio toric race and roller system and a fixed ratio planetary system coaxially aligned upon a common shaft intermediate the driving shaft and the driven shaft of the transmission, said fixed ratio planetary system having two races and planetary rollers in tractive contact therewith, a carrier for said rollers connected to said driven shaft, one of said planetary races connected to one of said toric races for free rotation upon said intermediate shaft and the other of said toric races connected to said shaft through a torque load device having two relatively rotatable discs with multiple torque cams each, one of said torque cam-discs connected to the last said toric race, and the other cam-disc connected to said intermediate shaft, the other planetary race being connected for torque and axiAl pressure to said intermediate shaft, and a planetary differential torque split device adapted to deliver the torque of the driving shaft in two predetermined components independent of each other to both of said cam-discs of the torque load device, said planetary differential device comprising two orbit gears, one of each connected to one of said cam-discs and a plurality of planet pinion gears meshing with both orbit gears and being rotatably carried by a flange extension of said driving shaft, whereby the driving torque is delivered in two components of predetermined size to both cam-discs of the torque loqd device to effect a modulation of the axial pressure characteristic over a selected portion of the speed ratio range between driving and driven shaft.
Claim 6
Dependent Claim
261 words
In a traction roller transmission comprising a variable ratio toric race and roller system and a fixed ratio planetary system coaxially aligned upon a common shaft intermediate the driving shaft and the driven shaft of the transmission, said fixed ratio planetary system having two races and planetary rollers in tractive contact therewith, a carrier for said rollers connected to said driven shaft, one of said planetary races connected to one of said toric races for free rotation upon said intermediate shaft and the other of said toric races connected to said shaft through a torque load device having two relatively rotatable discs with multiple torque cams each, one of said torque cam-discs connected to the last said toric race, and the other cam-disc connected to said intermediate shaft, the other planetary race being connected for torque and axiAl pressure to said intermediate shaft, and a planetary differential torque split device adapted to deliver the torque of the driving shaft in two predetermined components independent of each other to both of said cam-discs of the torque load device, said planetary differential device comprising two orbit gears, one of each connected to one of said cam-discs and a plurality of planet pinion gears meshing with both orbit gears and being rotatably carried by a flange extension of said driving shaft, whereby the driving torque is delivered in two components of predetermined size to both cam-discs of the torque loqd device to effect a modulation of the axial pressure characteristic over a selected portion of the speed ratio range between driving and driven shaft.
Claim 7
Dependent Claim
229 words
In a variable ratio transmission having a driving and a driven shaft in axial alignment, a fixed ratio planetary system having a sun gear member, a coaxial orbit gear member and a plurality of planetary pinion members rotatably carried by an extension of said driven shaft, a traction race and roller system comprising two toric races and a torque load device having two discs capable of limited rotation between each other and each disc provided with a plurality of torque cams axially facing the torque cams of the other disc, one of said torque cam discs connected to one of said toric races, the other connected to the above said orbit gear member, the combination with said torque load device of a differential planetary drive having two orbit spur gears meshing with a plurality of planetary pinion gears rotatably mounted on an extension of said driving shaft, each of said orbit spur gears connected to one of said torque cam discs, whereby the torque of the driving shaft is split into two torque components of preselected size and each of them transmitted separately to either of the two torque cam discs, so that the torque device is activated only by one of said compomemts of the input torque of the input shaft in addition to the torque transmitted between said toric race and the said planetary orbit gear member.
Claim 8
Dependent Claim
229 words
In a variable ratio transmission having a driving and a driven shaft in axial alignment, a fixed ratio planetary system having a sun gear member, a coaxial orbit gear member and a plurality of planetary pinion members rotatably carried by an extension of said driven shaft, a traction race and roller system comprising two toric races and a torque load device having two discs capable of limited rotation between each other and each disc provided with a plurality of torque cams axially facing the torque cams of the other disc, one of said torque cam discs connected to one of said toric races, the other connected to the above said orbit gear member, the combination with said torque load device of a differential planetary drive having two orbit spur gears meshing with a plurality of planetary pinion gears rotatably mounted on an extension of said driving shaft, each of said orbit spur gears connected to one of said torque cam discs, whereby the torque of the driving shaft is split into two torque components of preselected size and each of them transmitted separately to either of the two torque cam discs, so that the torque device is activated only by one of said compomemts of the input torque of the input shaft in addition to the torque transmitted between said toric race and the said planetary orbit gear member.
Claim 9
Dependent Claim
155 words
In a variable ratio traction transmission having a driving and a driven shaft, comprising a fixed ratio planetary system and a toric race and roller system including a torque load device having two torque cam discs rotatable relatively to each other for generating axial pressure in response to such relative rotation caused by torques applied to them for maintaining the tractive contact between rollers and races, the combination with a planetary differential torque split system having two orbit gears and a plurality of planetary pinion gears rotatably supported by said driving shaft and meshing with said orbit gears, each of said orbit gears connected to one of said torque cam discs of the torque load device, whereby the torque of the driving shaft is split into two components that are transmitted separately to the torque cam discs to achieve a modification of the axial pressure generated by other torques transmitted through the torque load device.
Claim 10
Dependent Claim
155 words
In a variable ratio traction transmission having a driving and a driven shaft, comprising a fixed ratio planetary system and a toric race and roller system including a torque load device having two torque cam discs rotatable relatively to each other for generating axial pressure in response to such relative rotation caused by torques applied to them for maintaining the tractive contact between rollers and races, the combination with a planetary differential torque split system having two orbit gears and a plurality of planetary pinion gears rotatably supported by said driving shaft and meshing with said orbit gears, each of said orbit gears connected to one of said torque cam discs of the torque load device, whereby the torque of the driving shaft is split into two components that are transmitted separately to the torque cam discs to achieve a modification of the axial pressure generated by other torques transmitted through the torque load device.
Claim 11
Dependent Claim
127 words
In a traction roller transmission, a variable ratio race and roller system and a fixed ratio planetary system having spheroidal rollers in tractive contact with a sun race having a concave race profile, and with an orbit race having a straight line race profile, the inclination of the straight line profile with respect to the geometric axis of both races being exactly the same as the inclination angle of the geometric tangent to the concave profile of the sun race in its point of contact with the spheroidal roller, so that the profile tangents in both contact points of the spheroidal roller are exactly parallel to each other, whereby any lateral displacement of the roller due to unsymmetrical distribution of pressure in the tractive contact is prevented.
Claim 12
Dependent Claim
127 words
In a traction roller transmission, a variable ratio race and roller system and a fixed ratio planetary system having spheroidal rollers in tractive contact with a sun race having a concave race profile, and with an orbit race having a straight line race profile, the inclination of the straight line profile with respect to the geometric axis of both races being exactly the same as the inclination angle of the geometric tangent to the concave profile of the sun race in its point of contact with the spheroidal roller, so that the profile tangents in both contact points of the spheroidal roller are exactly parallel to each other, whereby any lateral displacement of the roller due to unsymmetrical distribution of pressure in the tractive contact is prevented.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |