Class 74/458 - Worm and helical

Subclass of Class 74 - Machine element or mechanism
Definition: Devices directed to the structure and details of worm and
No. of patents: 118
Last issue date: 05/22/2012

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Number	Title	Issue Date
8181549	Steering apparatus An electric power steering apparatus 10 has an electric motor 46 for supplying an auxiliary force to a steering force inputted from a steering wheel 16, and transmits the steering force including the auxiliary force to a steered road-wheel 14...	05/22/2012
8033196	Resin double helical gear pair It is an object of the present invention to approximate of life of each resin double helical gear of a gearing resin double helical gear pair to each other by effectively increasing the strength of the tooth of the resin double helical gear with the higher rotationa...	10/11/2011
7665380	Hypoid gear design method A hypoid gear tooth surface design method, wherein normal lines and helical angles of two tooth surfaces are properly selected so as to position action limit curves (L3Acc) on the outer of the areas (R2t to R2h) where the tooth surfa...	02/23/2010
7654167	Electric power steering apparatus equipped with worm gear mechanism An electric power steering apparatus includes a worm gear mechanism for transmitting the torque generated by an electric motor to a steered road wheel of the vehicle. The worm gear mechanism has a worm gear made of metal and a worm wheel formed of plastic material a...	02/02/2010
7640822	Worm wheel and worm gear A resin worm wheel is formed by injection molding and includes a first end and a second end. The worm wheel is adapted to be driven by a worm. The worm wheel further includes: an engaging portion including a plurality of teeth engageable with the worm and a tooth sp...	01/05/2010
7552662	Novolute geometry for power gears Within the systems used to transmit power and or movement between two shafts, toothed wheels can be used. Also, pairs of screws with their complementary threads engaged can be used. A geometry is described for the thread profiles, for screws used in the transmission...	06/30/2009
7472620	Resin double helical gear and gear train using same There are provided a resin double helical gear capable of reducing operation noises and vibrations of an image forming system, such as an ink jet printer, which is arranged in the vicinity of an operator, and a gear train using the same and having a smaller number o...	01/06/2009
7249923	Flexible fastener This invention relates generally to a flexible fastener for coupling members. In a preferred embodiment, the flexible fastener may be used to couple members that are non-parallel, non-aligned, or in specific instances when selective compliance in a member is desired...	07/31/2007
7240762	Electric power steering apparatus A gearing radius of a worm wheel is set corresponding to a neighborhood region of a steering neutral position, in such a way as to be relatively large. Thus, backlash is made to be relatively small. This prevents noises from being produced when an automobile travels...	07/10/2007
7237449	Drive mechanism and movable table unit provided with the same A drive mechanism is interposed between two members to make the members move relatively with respect to each other. At least one of the two members is guided to move linearly. The drive mechanism comprises: cam followers that are rotatably supported on one of the tw...	07/03/2007
7191521	Advanced geometry of skew and straight bevel gears produced by forging The present invention provides for bevel gears having a localized and stable bearing contact. The localization of bearing contact is achieved by substitution of flat tooth surfaces with parabolic tooth surfaces. This is accomplished by either modifying line-contact ...	03/20/2007
7182566	Fastener having supplemental support and retention capabilities A fastener, such as a nail, screw, etc., which possesses supplemental support and/or retention capability is provided. The fastener includes an elongated auxiliary member secured interiorly to, exteriorly to, or along the shaft of the fastener. The auxiliary member ...	02/27/2007
7140269	Gear wheel with a multiple helical toothing, pressed in one part, and a method and device for manufacturing the same A gear wheel includes multiple helical toothings, each having a different helical angle. A pressing method for molding a gear wheel involves introducing a compactable material into a chamber of a pressing tool, compacting the material, exposing the helical toothings...	11/28/2006
7107871	Axially securing gearwheels in crown gear angle drives on one side A crown gear assembly including a crown gear which is rotatably supported around a first axis (A1) and which forms teeth (13) which are provided with flanks (14, 15) whose mantle lines extend substantially radially relative to the axis (A1	09/19/2006
7073249	Method for providing a worm on an armature shaft of an electric motor, and armature produced by the method The invention relates to a method for mounting a worm on an armature shaft of an armature for an electric motor. The invention proposes first mounting armature parts, such as an armature lamination packet with armature windings, a commutator, a bearing seat, and/or ...	07/11/2006
6973915	Device for controlling an engine The invention relates to a device for controlling an engine, in particular of an aircraft. The device has at least one throttle and a regulating device for additionally controlling the throttle automatically. A displacement of the throttle is transmitted permanently...	12/13/2005
6955513	Flexible fastener This invention relates generally to a flexible fastener for coupling members. In a preferred embodiment, the flexible fastener may be used to couple members that are non-parallel, non-aligned, or in specific instances when selective compliance in a member is desired...	10/18/2005
6916140	Method of producing an enveloping worm Enveloping worm threads with less than one revolution have on one side concave surface and on another side convex surface. This makes generation of concave and convex enveloping worm surfaces simultaneously and makes modification of surfaces by individual machining ...	07/12/2005
6912786	Herringbone gear teeth and method for manufacturing same A method of manufacturing herringbone gears starting with non-hardened cylindrical stock material, establishing a relief notch for each tooth in the cylindrical stock where the two helices meet, roughing the double helical teeth, and case-hardening the gear teeth. T...	07/05/2005
6896501	Single-screw compressor Present invention provides a single screw compressor from which only a small amount of gas to be compressed leaks and which can be manufactured at low costs. There are provided a screw rotor 1 having six grooves 2, 2, . . . and a gate rotor 4 ha...	05/24/2005
6783476	Compact full-traction differential The size, weight, and cost of a full-traction differential are significantly reduced by the synergism of several interrelated design features of a cartridge-like gear complex: (1) Each combination gear has only a shallow journal hole in each end of an otherwise soli...	08/31/2004
6776064	Double flank worm gear mechanism A worm/worm gear assembly comprises a worm having teeth defined by at least one thread disposed thereon and a worm gear having teeth protruding from a surface thereof. At least one of the worm and the worm gear is fabricated from a resilient material. The teeth of t...	08/17/2004
6543569	Electric power steering apparatus An electric power steering apparatus comprising a rack shaft having two racks, a first rack-and-pinion mechanism for transferring a steering torque to the rack shaft, and a second rack-and-pinion mechanism for transferring an assist torque to the rack sha...	04/08/2003
6523645	Pumping device for lubrication of saw chain A pumping device in connection with saw chain lubrication, especially in connection with a hand-held device, e.g. a chain saw, the pumping device including a pumping house, a piston that is received in the pumping house and means to bring the piston to ro...	02/25/2003
6487922	Steam turbine inlet sleeve inspection apparatus and method An inspection apparatus (40) for remote inspection of the trepan radius area (34) of the inlet sleeve (24) of a steam turbine (10). The apparatus (40) provides a sealed volume (50) between a pair of inflatable bladders (46,48) for the introduction of a li...	12/03/2002
6425455	Electric power steering apparatus An electric power steering apparatus includes a worm wheel having an annular tooth portion made of synthetic resin and a boss portion made of metal. The annular tooth portion has teeth that engage with a worm, and the boss portion is fitted to the annular...	07/30/2002
6398532	Single screw compressor This invention relates to a single screw compressor comprising a body housing a spindle, a screw and two pinions for engaging the screw, wherein both said pinions and said screw have unequal-width teeth, the diameter along said screw in an outer profile i...	06/04/2002
6354395	Delashed worm gear assembly and electric power assist apparatus An electric power assist apparatus for motor vehicle power steering including an electric motor and a speed reducer. The speed reducer includes a worm and a molded plastic worm gear on an output shaft of the speed reducer. The polymer from which the worm ...	03/12/2002
6347558	Ball screw device and linear motion device In a ball screw device comprising a screw shaft and a nut which make relative movement to each other through a multiplicity of balls, as well as in a linear motion device comprising an outer member and an inner member which make the relative movements to ...	02/19/2002
6247376	Rollable enveloped worm with two curve profile A drive gear engages a driven gear with non-intersecting axes of rotation making an angle of approximately 90° with respect to one another. A shaft has a first portion with a predetermined diameter, and a second portion has an enveloped worm gear with at...	06/19/2001
6205879	Helical and spur gear drive with double crowned pinion tooth surfaces and conjugated gear tooth surfaces Helical or spur gear drive comprising a driven gear and driving gear wherein the driving gear has double crowned teeth defined as (i) an envelope to a family of surfaces generated by a skew or straight rack-cutter having a parabolic tooth profile in norma...	03/27/2001
6189399	Adjustment device for motor vehicle seats The invention relates to an adjustment device for motor vehicle seats which contains a gearing part which meshes with a gearing member to limit backlash, the gearing part is formed by a main part consisting of a main gearing and a compensation part with a...	02/20/2001
6176148	Variable tooth worm The present invention relates to a variable tooth worm of worm gear sets used for a gear transmission mechanism. It comprises a shaft body with thread teeth. Its tip surface is a cylinder or a crowning surface, and the reference circle of the tooth flank ...	01/23/2001
6167771	Clearance distribution to reduce the leakage area Zero clearance screw rotor profiles are modified by determining clearance requirements at spaced points on the profiles and varying the clearance distribution between adjacent points using a non-linear distribution. Additionally, when the clearances are p...	01/02/2001
6148683	Worm/worm gear transmission A worm/worm gear transmission, particularly for use in a helicopter, and which includes an enveloping-type worm gear (3) having less than 24 teeth which are generated by an enveloping thread (1). The angle of one revolution of the thread has more than 15 ...	11/21/2000
6128969	Hybrid gear drive A hybrid gear drive suitable for the transformation of motion and power between an involute worm and a face gear wherein the axis of the face gear and the worm may be crossed or intersected. The gear drive includes a multi-thread involute worm in meshing ...	10/10/2000
6098480	Worm gear assembly for drive axle A drive axle assembly for a vehicle receives input torque from an engine via an input shaft. The input shaft drives a worm which in turn drives a worm gear. The worm gear includes teeth which engage and drive an axle shaft which in turn drives a vehicle w...	08/08/2000
6053061	Sliding feed mechanism having worm gear An improved sliding feed mechanism having a worm gear is disclosed can prevent a locking state from occurring between the worm and the worm wheel. The sliding feed mechanism includes a motor having a rotational shaft with an output end, a worm fixedly mou...	04/25/2000
5927144	Drive for adjusting parts of seating and reclining furniture A drive for adjusting parts of seating and reclining furniture, preferably for adjustable chairs, consisting of a basic housing for accepting a mechanism for driving a spindle fixed in position in the basic housing in a rotating manner, and a motor flange...	07/27/1999
5832780	Compact reduction gear with two reduction stages A reduction gear with two reduction stages including a first reduction stage consisting of a wheel and worm screw system. The system has a screw and a first wheel. A second stage includes a pinion meshing with a second toothed wheel. The wheel of the whee...	11/10/1998

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Class 74/458 - Worm and helical