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Class Information
Number: 74/640
Name: Machine element or mechanism > Gearing
Description: Mechanism comprising relatively rotatable bodies or combinations of such bodies provided with teeth or interengaging elements, chains and sprockets, belts, and pulleys or other means not otherwise classified, whereby a rotatable body will impart to or receive motion or power from some other member by rolling contact.










Sub-classes under this class:

Class Number Class Name Patents
74/395 Adjustable 85
74/318 Alternating rotary or continuous 3
74/319 Alternating rotary 7
74/409 Backlash take-up 444
74/391 Central driving shaft in axle 36
74/412R Directly cooperating gears 37
74/405 Disconnecting means 124
74/406 Displaceable elements 35
74/390 Eccentric driving shaft and axle 18
74/388R Follow-up mechanism 36
74/431 Gear and rotary bodies 44
74/745 In series plural interchangeably locked nonplanetary units 202
74/325 Interchangeably locked 176
74/467 Lubrication 360
74/650 Nonplanetary gearing differential type (e.g., gearless differentials) 218
74/392 Parallel shafts, adjustable gear mesh 23
74/380 Pivotally supported 20
74/664 Plural power paths from prime mover 59
74/665R Plural power paths to and/or from gearing 52
74/661 Plural prime movers selectively coupled to common output 201
74/410 Pressure distributing 186
74/810.1 Reversal of direction of power flow changes power transmission to alternate path 114
74/404 Reversing means 40
74/434 Rotary bodies 88
74/655 Single gearing unit includes fluid drive 19
74/457 Teeth 91
74/216.3 Toothed gear and recirculated unconnected elements 22
74/393 Varying speed ratio 84
74/411.5 With brake means for gearing 249
74/730.1 With fluid drive 117
74/411 Yieldability in gear trains 288


Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
7107865 Power transmission apparatus for vehicle Sep. 19, 2006
7086309 Planetary-harmonic motor Aug. 8, 2006
7086980 Combination of drive power transmission device and differential gear and manufacturing method therefor Aug. 8, 2006
7047923 Device for varying valve timing in an internal combustion engine May. 23, 2006
7044876 Bicycle sprocket having lateral protrusions for use in a multiple sprocket assembly May. 16, 2006
7044023 Knob with different gear ratios May. 16, 2006
6968755 Lightweight bearing and wave gear drive Nov. 29, 2005
6912930 Flex spline for meshing type gear device, and meshing type gear device having flex spline Jul. 5, 2005
6874231 Method of manufacturing a rigid internal gear of a wave gear device Apr. 5, 2005
6848337 Transmission mechanism for driving four wheels Feb. 1, 2005
6845689 Silk hat shaped wave gear device Jan. 25, 2005
6843151 Transmission mechanism with a single differential mechanism Jan. 18, 2005
6837821 Differential Jan. 4, 2005
6829457 Driving apparatus and image formation apparatus using the driving apparatus Dec. 7, 2004
6817267 Actuator having a wave gear reduction drive Nov. 16, 2004
6805025 Harmonic drive and internal geared wheel for a drive of this type Oct. 19, 2004
6799489 Wave gearing with three-dimensional deviatedly meshed tooth profile Oct. 5, 2004
6796204 Rotary cutterbar gear housing having support for pinion gear Sep. 28, 2004
6786112 Harmonic drive with crowned drive ring Sep. 7, 2004
6776067 Harmonic drive and internal geared wheel for a drive of this type Aug. 17, 2004
6772655 Harmonic drive Aug. 10, 2004
6736028 Harmonic drive and internal geared wheel for a drive of this type May. 18, 2004
6701803 Reduction gears-integrated actuator Mar. 9, 2004
6699154 Differential gear assembly Mar. 2, 2004
6672181 Lubrication mechanism for a wave gear device Jan. 6, 2004
6647827 Lightweight wave gear drive Nov. 18, 2003
6648786 Gearmotors Nov. 18, 2003
6622593 Lightweight wave gear device Sep. 23, 2003
6615689 Non-lubricated wave gear device Sep. 9, 2003
6564677 Wave gear drive having a transfer-torque control mechanism May. 20, 2003
6547689 Angular motion translator Apr. 15, 2003
6533425 Retractable rear-view mirror for motor vehicles Mar. 18, 2003
6526849 Negative deflection flexible meshing type gear device having passing tooth profile with maximized tooth height Mar. 4, 2003
6477918 Rotary electric machine having coaxial output hollow shaft with reduction gear and slip ring Nov. 12, 2002
6467375 Flexible meshing type gear device having deflection meshing involute tooth profile Oct. 22, 2002
6468465 Plastic injection molding with reduced dimensional variations using gas pressure and secondary plastic injection Oct. 22, 2002
6467374 Continuously variable mechanical transmission Oct. 22, 2002
6453772 Eccentric toothed gearing Sep. 24, 2002
6454532 Harmonic drive system for the retraction/extension of variable diameter rotor systems Sep. 24, 2002
6439081 Harmonic friction drive Aug. 27, 2002
6318210 Phase regulating apparatus Nov. 20, 2001
6314835 Piezo-electric drive arrangement for a harmonic drive transmission Nov. 13, 2001
6310455 Positioning and actuating drive Oct. 30, 2001
6290623 Removable support of motor vehicle differential side gear that facilitates machining Sep. 18, 2001
6269711 Transmission device using flexible gear Aug. 7, 2001
6258007 Multi-sensor harmonic drive actuator arrangement assembly Jul. 10, 2001
6250179 Silk hat flexible engagement gear device Jun. 26, 2001
6230587 Corrugated gear and process for calculating gear profiles for corrugated gears May. 15, 2001
6220115 Step-down gear unit Apr. 24, 2001
6202508 Silk hat flexible engagement gear device Mar. 20, 2001

1 2 3 4 5 6










 
 
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