Source: http://www.google.com/patents/US7086981?dq=7,403,220
Timestamp: 2016-07-28 21:30:27
Document Index: 674290338

Matched Legal Cases: ['art 23', 'art 23', 'arts 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26']

Patent US7086981 - Transmission and constant speed accessory drive - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn infinitely variable speed ratio planetary ball transmission comprising planetary members in rolling contact with moveable inner and outer races and a constant speed accessory drive system utilizing the transmission. The transmission is infinitely variable between ratios of approximately 0.3 and 1.0....http://www.google.com/patents/US7086981?utm_source=gb-gplus-sharePatent US7086981 - Transmission and constant speed accessory driveAdvanced Patent SearchPublication numberUS7086981 B2Publication typeGrantApplication numberUS 10/780,979Publication dateAug 8, 2006Filing dateFeb 18, 2004Priority dateFeb 18, 2004Fee statusPaidAlso published asCA2555055A1, CA2555055C, CN1918406A, CN100540956C, DE602004014644D1, EP1716354A1, EP1716354B1, US7396311, US20050181905, US20060154775, WO2005083305A1Publication number10780979, 780979, US 7086981 B2, US 7086981B2, US-B2-7086981, US7086981 B2, US7086981B2InventorsImtiaz Ali, Alexander SerkhOriginal AssigneeThe Gates CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (46), Non-Patent Citations (4), Referenced by (124), Classifications (13), Legal Events (9) External Links: USPTO, USPTO Assignment, EspacenetTransmission and constant speed accessory drive
Part 23 b is an adjustable member and is axially moveable along shaft 11 by a helical interengagement means comprising a ball screw threaded engagement, see FIG. 3. The ball screw comprises cooperating thread flights or helical channels 37 and 38 with rolling elements or balls 39 cooperatively disposed therein, see FIG. 10. Helical channels 37 and 38 and balls 39 can alternatively be replaced by a known threaded engagement, for example “ajax” or “acme” threads on part 23 b and input shaft 11.
Outer race 26 comprises axially separable annular race parts 26 a, 26 b. Outer race 26 comprises part 26 a which has an axially extending cylindrical portion 42 within which the second of the radially outer race part 26 b is rotatably engaged. Part 26 a and part 26 b are rotationally connected by a helical interengagement means, the combination comprising means for selectively varying the axial separation of the race parts. Namely, an inner surface of the cylindrical portion 42 has a helical channel 43. Radially outer race part 26 b is an adjustment member and has on its outer cylindrical surface a helical channel 44. Rolling elements or balls 48 having a rolling engagement are disposed between channel 43 and channel 44 allowing outer race part 26 b to rotate with respect to portion 42. Channel 43, channel 44 and balls 48 together form a ball screw. Channels 43, 44 have a pitch coarse enough to effect timely ratio changing between extremes without requiring excessive travel of the ratio change worm gear, see FIG. 9, while not being so coarse that the contact conditions simply force the races apart. Channels 43, 44 and balls 48 may also be replaced with a threaded engagement, including “ajax” or “acme” threads. An angular movement or rotation of outer race part 26 b with respect to part 26 a to effect a full ratio change is approximately 150�.
Race part 26 a rotates within indentations in housing 5 while moving in an axial direction which is parallel to axis X—X for ratio changes. Axis X—X is the common axis of rotation of the transmission, including the input shaft 11, the inner and outer raceways 23, 26, the output shafts 22, 102, as well as being the center of the orbital path of the spherical planetary members 25. Race part 26 b engages housing 5 in such a manner so as to prevent rotation of part 26 b with respect to housing 5, but in a manner to otherwise allow axial movement of part 26 b toward or away from part 26 a as part 26 a rotates.
Each planetary member 25 is also rotationally engaged with a follower member 15. Planetary motion of the members 25 is conveyed to the follower members 15 and, via the shafts 16, to the planet cage 14 which is in turn connected to output shafts 22 and 102. Since members 25 move both radially and axially with respect to shaft 11 during ratio changes of the transmission each follower member 15 is also slightly moveable axially on bearings 60 in a direction parallel to axis X—X so that proper contact with each member 25 is maintained through the entire range of motion of each.
A spherical planetary member 25 shape is well suited for this role because such a planetary member is in equilibrium under the action of four peripheral contact radial ‘squeezing’ forces applied by the races in the plane of FIG. 2 (the y direction) and a driving force through the member center normal to the plane of the drawing (the z direction), as here, y/z has the same value wherever on the periphery the contact points may be. This means that the inner and outer race y/z values are equal for any ratio setting of the transmission. Torsion spring 40 acting on an inner race 23 b provides sufficient preload to ensure that there is always enough contact pressure for the torque sensitive mechanism to function as the torque increases from zero.
FIG. 8 is a detail of the housing and outer race. Housing 5 comprises sections 72, 73. Outer race part 26 b is shown with dowels 26 c. Dowels 26 c engage holes in housing section 72. Race part 26 b is freely moveable in an axial direction (with respect to axis X—X) upon dowels 26 c as outer race part 26 a is rotated by worm drive 90. Dowels 26 c constrain outer race part 26 b from rotating as part 26 a rotates.
Grease or light oil can be used for a non-coated steel thrust washer. In this case the coefficient of friction of the steel only washer is approximately 0.9–1.1. In the case where it is necessary to reduce the coefficient of friction below that of steel the following thermoplastic materials can be used (by way of example and not of limitation): Arlen AE 4200 (Mitsui Petrochemical), Lubricomp 189 (LNP Engineered Plastics). The coefficient of friction for the thermoplastic materials is approximately 0.06 to 1.0. Oil or grease is not used with the thermoplastic materials.
Using vehicle simulation software, for example, GT-Drive™ from Gamma Technologies, Inc., it is possible to quantify the benefits of the inventive CSAD system. The following exemplary discussion relates to simulating the performance of a Ford Focus™ with a 2.0L engine and a five speed manual transmission.
The significantly improved acceleration performance of the vehicle using the inventive system is shown in FIG. 14. FIG. 14 depicts vehicle acceleration performance differences between two example accessory speeds. Curve (B) depicts the performance of a prior art engine using a prior art asynchronous belt drive system (ABDS). In the prior art system the accessory drive speed is directly proportional to the speed of the engine crankshaft since the accessories are directly coupled to the crankshaft by a single belt. By comparison, when the transmission output pulley 101 is operated at a constant speed of approximately 885 RPM (Curve (A)) using the inventive system, an approximate 4.0 second improvement in the 0–60 MPH acceleration time is realized. 885 RPM is the engine idle speed where the alternator generates approximately 70% of its rated current. When the accessories are operated at a constant speed of 2000 RPM (Curve (C)), the minimum speed where the alternator generates approximately 100% of its rated current, the elapsed 0–60 time improvement is just slightly less than approximately 4.0 seconds. In either case (A or C) operating the accessories at a constant speed at or less than the speed of the engine crankshaft significantly improves vehicle performance by providing additional torque to the drive axle that would otherwise be used driving the accessories.
The “%” values indicate the percentage of time the AC (air conditioner) and Alt (alternator) are in operation. For example, one can see that for the city cycle at 1400 RPM with the AC 100% and Alt 100%, the % increase in MPG is approximately 11%. Likewise for highway cycle, the % increase is approximately 11%.
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examinerClassifications U.S. Classification475/210, 475/196International ClassificationF02B67/06, F16H61/662, F16H37/02, F16H13/08, F16H63/06Cooperative ClassificationF16H61/6648, F16H63/062, F02B2275/06, F02B67/06European ClassificationF16H61/664H, F02B67/06Legal EventsDateCodeEventDescriptionMar 12, 2004ASAssignmentOwner name: GATES CORPORATION, THE, COLORADOFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ALI, IMTIAZ;SERKH, ALEXANDER;REEL/FRAME:015067/0646Effective date: 20040127Feb 8, 2010FPAYFee paymentYear of fee payment: 4Dec 29, 2010ASAssignmentOwner name: CITICORP USA, INC., AS COLLATERAL AGENT, NEW YORKFree format text: SECURITY AGREEMENT;ASSIGNORS:AIR SYSTEM COMPONENTS, INC.;AQUATIC CO.;DEXTER AXLE COMPANY;AND OTHERS;REEL/FRAME:025549/0407Effective date: 20100929Dec 30, 2010ASAssignmentOwner name: WILMINGTON TRUST FSB, AS COLLATERAL AGENT, CONNECTFree format text: SECOND LIEN NOTES PATENT SECURITY AGREEMENT;ASSIGNORS:AIR SYSTEM COMPONENTS, INC.;AQUATIC CO.;DEXTER 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20140804Feb 4, 2015ASAssignmentOwner name: GATES CORPORATION, COLORADOFree format text: CHANGE OF NAME;ASSIGNOR:THE GATES CORPORATION;REEL/FRAME:034893/0006Effective date: 20150108RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services