Pulley Having Circumferentially Spaced Portions Of Drive Face Spaced Unequal Distances From Pulley Axis Of Rotation (e.g., Elliptical Pulley, Etc.) Patents (Class 474/141)
  • Patent number: 11009114
    Abstract: Provided is a sprocket which suppresses generation of order sounds corresponding to cycles and prevents increase in tension fluctuations, noise, and vibrations caused by resonance while alleviating the influence of the tension fluctuations corresponding to load torque fluctuations and suppressing noise and vibrations. A plurality of teeth formed to engage with a chain are arranged to form a phase fluctuation pattern of a waveform having a phase which fluctuates between positive and negative sides, and the phase fluctuation pattern is set to have parts having different wavelengths.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: May 18, 2021
    Assignee: TSUBAKIMOTO CHAIN CO.
    Inventors: Yuji Kurematsu, Tsuyoshi Kabai, Kazuyuki Ebinuma
  • Patent number: 10950484
    Abstract: An apparatus including at least one drive; a first robot arm having a first upper arm, a first forearm and a first end effector. The first upper arm is connected to the at least one drive at a first axis of rotation. A second robot arm has a second upper arm, a second forearm and a second end effector. The second upper arm is connected to the at least one drive at a second axis of rotation which is spaced from the first axis of rotation. The first and second robot arms are configured to locate the end effectors in first retracted positions for stacking substrates located on the end effectors at least partially one above the another. The first and second robot arms are configured to extend the end effectors from the first retracted positions in a first direction along parallel first paths located at least partially directly one above the other.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: March 16, 2021
    Assignee: Persimmon Technologies Corporation
    Inventor: Martin Hosek
  • Patent number: 10689064
    Abstract: A gear (10) for a bicycle transmission (20) is described, having an external contour (11) with teeth (12a, 12b) formed thereon, wherein the external contour (11) is defined by a maximum pitch diameter (Ømax) and a minimum pitch diameter (Ømin), does not have any axes of symmetry and is formed exclusively with point symmetry with respect to its centre of symmetry (M). The invention was therefore based on the problem of developing a gear (10) which improves the pedaling feel of a bicycle transmission (20). The problem is solved in that the external contour (11) exhibits a change in its curvature at every point.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: June 23, 2020
    Assignee: Move Bikes GmbH
    Inventors: Tobias Sprote, Stefan Schubert, Marcus Rochlitzer
  • Patent number: 10550925
    Abstract: A bicycle sprocket is basically provided with a sprocket body and a plurality of chain-driving teeth. The sprocket body includes a central portion, an annular portion and an intermediate portion. The central portion has a first end surface disposed around a central opening on a side surface of the intermediate portion. The annular portion is disposed radially outward from the central portion. The intermediate portion extends between the central portion and the annular portion in a radial direction. The chain-driving teeth extend radially outward from the annular portion of the sprocket body to engage with a bicycle chain. The sprocket body includes a rib protruding from the side surface of the intermediate portion. The rib has a second end surface being axially outermost in the intermediate portion. The second end surface is farther away from the center plane than the first end surface in the axial direction.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: February 4, 2020
    Assignee: Shimano Inc.
    Inventor: Kenichi Akanishi
  • Patent number: 10224232
    Abstract: An apparatus including at least one drive; a first robot arm having a first upper arm, a first forearm and a first end effector. The first upper arm is connected to the at least one drive at a first axis of rotation. A second robot arm has a second upper arm, a second forearm and a second end effector. The second upper arm is connected to the at least one drive at a second axis of rotation which is spaced from the first axis of rotation. The first and second robot arms are configured to locate the end effectors in first retracted positions for stacking substrates located on the end effectors at least partially one above the another. The first and second robot arms are configured to extend the end effectors from the first retracted positions in a first direction along parallel first paths located at least partially directly one above the other.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: March 5, 2019
    Assignee: Persimmon Technologies Corporation
    Inventor: Martin Hosek
  • Patent number: 10160514
    Abstract: A bicycle crankset, which is adapted to connect to a chain, includes a chainring, a spider, and a crankarm. The chainring has teeth on an edge thereof to engage the chain and a chainring axis through a center thereof. The spider has spider arms to detachably connect to the chainring and a connecting bore. The spider has a core axis through a center of the connecting bore, and the core axis is kept a predetermined distance away from the chainring axis to form a deviation. The crankarm has an engaging member to engage the connecting bore of the spider. Tips of the teeth of the chainring move in a noncircular path when the crankarm is exerted to drive the chainring to turned, and the noncircular path is adjustable by shifting a location of the connecting bore which change the deviation.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: December 25, 2018
    Assignee: Drivetrain Tech Solution Inc.
    Inventor: Po-Cheng Chen
  • Patent number: 9149936
    Abstract: A transport apparatus including a drive; a first arm connected to the drive, where the first arm includes a first link, a second link and an end effector connected in series with the drive, where the first link and the second link have different effective lengths; and a system for limiting rotation of the end effector relative to the second link to provide substantially only straight movement of the end effector relative to the drive when the first arm is extended or retracted.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 6, 2015
    Assignee: Persimmon Technologies, Corp.
    Inventors: Martin Hosek, Christopher Hofmeister
  • Patent number: 9108699
    Abstract: Crank arm spider adjustment orientation system to provide different angular orientations in the attachment of at least an ovoid chainring, comprising an ovoid chainring (3) and a spider (1), both of them provided with multiple anchorage points (30, 10) arranged as holes distributed along the perimeter of a BCD, and mechanical anchorage means (5) engaging chainring anchorage points (30) with corresponding spider anchorage points (10); where the number of said spider anchorage points (10) is multiple of and greater than the number of said mechanical anchorage means (5), and the angular increment between consecutive chainring's (3) orientations provided by the chainring anchorage points (30) is different than the angular increment between consecutive chainring's (3) orientations provided by the spider anchorage points (10), so the combination of the spider (1) with at least one ovoid chainring (3) multiplies the possibilities for said ovoid chainring's (3) orientation reducing the angular increment between conse
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: August 18, 2015
    Assignee: Rotor Componentes Tecnologicos S.L.
    Inventor: Pablo Carrasco Vergara
  • Patent number: 9074682
    Abstract: According to the present invention, an asymmetric elliptical chain gear (10) is characterized by having a shape formed by a combination of: a first ellipse (1) the major axis of which is located on the X-axis of a vertical coordinate system and the minor axis of which is located on the Y-axis of the vertical coordinate system; a first straight line (3) which is perpendicular to the minor axis, and which intersects the first ellipse (1); and a second ellipse (2) which exists on the first straight line (3) and which passes first inflection points (A, A?) that form a fixed angle (a) with respect to the minor axis in the clockwise direction, and which contacts ellipse contact points (B, B?) on the first ellipse (1) that are located at points forming a fixed angle (b) in the clockwise direction.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: July 7, 2015
    Inventor: Yun Seok Choi
  • Publication number: 20150148161
    Abstract: A rotary component is provided, including a body that has a non-circular periphery and a plurality of teeth positioned about the periphery of the body. The non-circular periphery of the body causes variation in the tension generated in an endless drive member engaged with the rotary component during rotation of the rotary component about an axis. A valley separates each tooth from each adjacent tooth. At least one of the width of each valley and the tooth pitch is generally related to the amount of tension generated in the endless drive member during rotation of the rotary component about the axis at a time when the valley receives a belt tooth. In a preferred embodiment, both the valley width and the tooth pitch are generally related to the amount of tension generated in the endless drive member during rotation of the rotary component about the axis at a time when the valley receives a belt tooth.
    Type: Application
    Filed: April 25, 2013
    Publication date: May 28, 2015
    Inventors: Witold Gajewski, Alin Cotrau
  • Patent number: 9039553
    Abstract: The present invention is structured by using one or both of an active wheel and a passive wheel being composed of an eccentric transmission wheel and being combined with a synchronous transmission belt for forming an eccentric wheel transmission wheel series, so that in the reciprocal treadle performed by the human's feet, when the feet input forces at different angles from the treadle shafts of the treadles to an active wheel shaft combined on the active wheel through cranks, the active wheel forms different transmission speed ratios relative to the passive wheel according to the treadle angle.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: May 26, 2015
    Inventor: Tai-Her Yang
  • Patent number: 9005062
    Abstract: This invention is applicable to bicycle non-circular chainrings or ovoid chainrings, attachable to a drive crank arm with a spider, forming a structure with anchorage points distributed in a star like shape; the said ovoid chainring (1) having a major diameter, whose angle with the said crank arm measured in the pedaling direction defines its orientation; whereas, said ovoid chainring has a number of anchorage points to said spider which is a multiple of the number of anchorage points of the spider, constituting multiple anchorage options to this crank arm, separated in such a distance that respective orientation values differ in 3°; and for such a small variation, the proposed constructive solution is equipping the ovoid chainring with consecutive overlapped holes and respective countersinks with different depth, forming stair steps which help supporting tangential loads to the chainring.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: April 14, 2015
    Assignee: Rotor Componentes Technologicos S.L.
    Inventor: Pablo Carrasco Vergara
  • Publication number: 20140221139
    Abstract: According to the present invention, an asymmetric elliptical chain gear (10) is characterized by having a shape formed by a combination of: a first ellipse (1) the major axis of which is located on the X-axis of a vertical coordinate system and the minor axis of which is located on the Y-axis of the vertical coordinate system; a first straight line (3) which is perpendicular to the minor axis, and which intersects the first ellipse (1); and a second ellipse (2) which exists on the first straight line (3) and which passes first inflection points (A, A?) that form a fixed angle (a) with respect to the minor axis in the clockwise direction, and which contacts ellipse contact points (B, B?) on the first ellipse (1) that are located at points forming a fixed angle (b) in the clockwise direction.
    Type: Application
    Filed: August 21, 2012
    Publication date: August 7, 2014
    Inventor: Yun Seok Choi
  • Publication number: 20130281239
    Abstract: This invention is applicable to bicycle non-circular chainrings or ovoid chainrings, attachable to a drive crank arm with a spider, forming a structure with anchorage points distributed in a star like shape; the said ovoid chainring (1) having a major diameter, whose angle with the said crank arm measured in the pedaling direction defines its orientation; whereas, said ovoid chainring has a number of anchorage points to said spider which is a multiple of the number of anchorage points of the spider, constituting multiple anchorage options to this crank arm, separated in such a distance that respective orientation values differ in 3°; and for such a small variation, the proposed constructive solution is equipping the ovoid chainring with consecutive overlapped holes and respective countersinks with different depth, forming stair steps which help supporting tangential loads to the chainring.
    Type: Application
    Filed: July 5, 2011
    Publication date: October 24, 2013
    Applicant: ROTOR COMPONENTES TECNOLOGICOS S.L.
    Inventor: Pablo Carrasco Vergara
  • Patent number: 8348794
    Abstract: A drive transmission system for activating a cogged flexible transmission organ includes a support pulley borne idle on a drive shaft which contacts tops of the organ cogs at a calibrated circumference thereof which defines a predetermined winding radius of the flexible transmission organ. A cogged drawing pulley is mounted on the drive shaft and has cogs for enmeshing with recesses in the cogged flexible transmission organ for advancing the flexible transmission organ. The drawing pulley has cogs sized for enmeshing with the recesses of the cogged flexible transmission organ, such that tops of the drawing pulley cogs are displaced from bottoms of the drawing pulley recesses. The drawing pulley therefore cannot drag on the flexible transmission organ when the support pulley is not subject to drive torque.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: January 8, 2013
    Assignee: Marchesini Group S.p.A.
    Inventor: Giuseppe Monti
  • Patent number: 8342993
    Abstract: A synchronous drive apparatus that includes a continuous loop elongate drive structure and first and second driven rotors that are configured to cooperate with the continuous loop elongate drive structure to generate first and second opposing fluctuating corrective torques, respectively, that are configured to at least partly counteract first and second periodic fluctuating load torques, respectively.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: January 1, 2013
    Assignee: Litens Automotive Partnership
    Inventor: Witold Gajewski
  • Patent number: 8303444
    Abstract: A synchronous drive apparatus includes first and a second rotors. The rotors have multiple teeth for engaging engaging sections of an elongate drive structure. A rotary load assembly couples to the second rotor. The elongate drive structure engages about the rotors. The first rotor drives and the second rotor is driven by the elongate drive structure. One of the rotors has a non-circular profile having at least two protruding portions alternating with receding portions. The rotary load assembly presents a periodic fluctuating load torque when driven in rotation. The angular positions of the protruding and receding portions of the non-circular profile relative to the angular position of the second rotor, and the magnitude of the eccentricity of the non-circular profile, are such that the non-circular profile applies to the second rotor an opposing fluctuating corrective torque which reduces or cancels the fluctuating load torque of the rotary load assembly.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: November 6, 2012
    Assignee: Litens Automotive Partnership
    Inventor: Witold Gajewski
  • Patent number: 8267823
    Abstract: A drive transmission system for activating a cogged flexible transmission organ includes a support pulley borne idle on a drive shaft which contacts tops of the organ cogs at a calibrated circumference thereof which defines a predetermined winding radius of the flexible transmission organ. A cogged drawing pulley is mounted on the drive shaft and has cogs for enmeshing with recesses in the cogged flexible transmission organ for advancing the flexible transmission organ. The drawing pulley has cogs sized for enmeshing with the recesses of the cogged flexible transmission organ, such that tops of the drawing pulley cogs are displaced from bottoms of the flexible transmission organ recesses and tops of the flexible transmission organ cogs are displaced from bottoms of the drawing pulley recesses. The drawing pulley therefore cannot drag on the flexible transmission organ when the support pulley is not subject to drive torque.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: September 18, 2012
    Assignee: Marchesini Group S.p.A.
    Inventor: Giuseppe Monti
  • Patent number: 8066601
    Abstract: In a timing chain driving system in which the speed of a driving sprocket fluctuates cyclically, the tooth pitch of a driven sprocket from which a tension span of the chain travels toward the driving sprocket varies cyclically around the circumference of the driven sprocket so that the tooth pitch at the point at which the timing chain disengages from the driven sprocket is at a minimum when the rotational speed of the driving sprocket is maximum, moderating fluctuations in chain tension. A similar effect can be achieved in the case of a driving sprocket having a cyclically varying tooth pitch by arranging the driving sprocket so that its tooth pitch is maximum at the point at which it is engaged by the chain when its rotational speed is maximum.
    Type: Grant
    Filed: November 11, 2009
    Date of Patent: November 29, 2011
    Assignee: Tsubakimoto Chain Co.
    Inventors: Yoshikazu Nakano, Shunji Sakura, Kohei Kunimatsu
  • Patent number: 8062158
    Abstract: In a timing chain drive unit the tooth pitch of a driven sprocket from which a tension span of the chain travels toward a driving sprocket varies cyclically around the circumference of the driven sprocket and cyclically increases and decreases the length of the tension span in synchronism with load variations imparted to the driven sprocket by a valve-operating camshaft.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: November 22, 2011
    Assignee: Tsubakimoto Chain Co.
    Inventors: Yoshikazu Nakano, Shunji Sakura, Kohei Kunimatsu
  • Patent number: 7883437
    Abstract: A sprocket for transferring a force between a chain and a drive element that includes a plurality of teeth and a plurality of openings proximate the teeth. Each tooth has a load-bearing flank and a non-load-bearing flank. One of the plurality of openings are arranged relative to one of the plurality of teeth, in one-to-one correspondence therebetween, such that the opening is asymmetrically divided by a radial centerline of the tooth, a first load strip is formed between the opening and the load-bearing flank of the tooth, and a second load strip is formed between the opening and the non-load-bearing flank of the tooth.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: February 8, 2011
    Assignee: SRAM Deutschland GmbH
    Inventor: Henrik Braedt
  • Publication number: 20110028254
    Abstract: A belt drive is provided, especially a timing-belt drive for an internal-combustion engine, with a driving gear of a driveshaft, at least one driven gear of a driven shaft, and a belt means, wherein the driving or the driven gear imparts additional irregularity to the belt drive due to its noncircular shape and its phase position, which leads to stable running of the belt means. A noncircular gear that can be mounted easily and in phase, as well as with a fixed position, is realized in that the driving or driven noncircular gear has in its in-phase rotational position a rotationally fixed connection to its driving or driven shaft.
    Type: Application
    Filed: October 13, 2010
    Publication date: February 3, 2011
    Applicant: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
    Inventors: Michael Bogner, Rainer Pflug
  • Patent number: 7857720
    Abstract: A synchronous belt drive system comprising an obround sprocket (10) having a toothed surface and at least one linear portion (16) disposed between two arcuate portions (14,15), the arcuate portions having a constant radius (R1, R2), the linear portion having a predetermined length, a second sprocket (300) having a toothed surface, the second sprocket engaged to the obround sprocket by an endless toothed member (200), the second sprocket connected to a rotary load, the rotary load having cyclic torque fluctuations, and a radius (R1) of the obround sprocket (10) oriented at a belt entry point (201) which coincides with a maximum amplitude of a cyclic torque fluctuation such that a span length (SL) of the endless toothed member is made to vary in a manner that substantially cancels the cyclic torque fluctuations.
    Type: Grant
    Filed: October 1, 2007
    Date of Patent: December 28, 2010
    Assignee: The Gates Corporation
    Inventor: Fraser Lacy
  • Publication number: 20100317475
    Abstract: A chain guide mount is adapted to be attached on a bicycle having a frame including a bottom bracket shell. A bottom bracket sleeve is position in the shell, and the sleeve includes a first anti-rotation feature. The chain guide mount has mounting locations for attachment of a chain guide, and further has a second anti-rotation feature engaging the first anti-rotation feature to thereby inhibit rotation of the chain guide mount relative to the sleeve. In one embodiment, the sleeve includes a cylindrical part position in the shell and a flange positioned outside the shell. In order to insure proper rotational orientation of the chain guide mount, the first and second anti-rotation features are preferably asymmetrically positioned around a bottom bracket axis defined by the bearing. In addition, a first alignment feature is provided on the frame, and the sleeve includes a second alignment feature engaging the first alignment feature.
    Type: Application
    Filed: June 12, 2009
    Publication date: December 16, 2010
    Applicant: SPECIALIZED BICYCLE COMPONENTS, INC.
    Inventor: Jan Talavasek
  • Publication number: 20100197433
    Abstract: A synchronous drive apparatus includes first and a second rotors. The rotors have multiple teeth for engaging engaging sections of an elongate drive structure. A rotary load assembly couples to the second rotor. The elongate drive structure engages about the rotors. The first rotor drives and the second rotor is driven by the elongate drive structure. One of the rotors has a non-circular profile having at least two protruding portions alternating with receding portions. The rotary load assembly presents a periodic fluctuating load torque when driven in rotation. The angular positions of the protruding and receding portions of the non-circular profile relative to the angular position of the second rotor, and the magnitude of the eccentricity of the non-circular profile, are such that the non-circular profile applies to the second rotor an opposing fluctuating corrective torque which reduces or cancels the fluctuating load torque of the rotary load assembly.
    Type: Application
    Filed: March 3, 2010
    Publication date: August 5, 2010
    Inventor: Witold Gajewski
  • Patent number: 7749117
    Abstract: Improvement in the design of variable original radius chainrings for coupling to conventional bicycle cranks in order to apply traction, which primarily consists of its being provided with a plurality of possible anchorages to the crank, so that the user may adjust the relative position between the crank and the major radius of the chainring, and thus optimize the biomechanics of his own pedalling; furthermore, other design parameters are offered to endow this non-circular pedalling with leg speeds optimized within the limitation of pedalling with cranks at 180 degrees and therefore with a dead spot.
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: July 6, 2010
    Assignee: Rotor Components Technologies, S.L.
    Inventor: Pablo Carrasco Vergara
  • Publication number: 20100160100
    Abstract: A synchronous drive apparatus that includes a continuous loop elongate drive structure and first and second driven rotors that are configured to cooperate with the continuous loop elongate drive structure to generate first and second opposing fluctuating corrective torques, respectively, that are configured to at least partly counteract first and second periodic fluctuating load torques, respectively.
    Type: Application
    Filed: December 22, 2009
    Publication date: June 24, 2010
    Inventor: Witold Gajewski
  • Publication number: 20100041501
    Abstract: A continuously variable transmission for transmitting torque with at least one input shaft introducing torque into the continuously variable transmission, with at least one further shaft, to which the torque is to be transmitted, and a force-transmitting endless element, which has a non-positive connection to the at least one input shaft and the at least one further shaft. A connection between either the at least one input shaft or the at least one further shaft and the force-transmitting endless element is provided by a rotary disk (10) around which the force-transmitting endless element is wrapped. The continuously variable transmission is characterized in that the rotary disk (10) has a radius (20), which is dependent functionally on a rotational angle and a certain mean radius. The invention further relates to an out-of-round rotary disk (10) for providing a non-positive connection.
    Type: Application
    Filed: September 13, 2007
    Publication date: February 18, 2010
    Applicant: SCHAEFFLER KG
    Inventors: Frank Rettig, Peter Kelm
  • Publication number: 20090253542
    Abstract: The configuration of teeth (20) and spacewidths (22) of a rotary disc (10) which is rotatable about a rotational axis (12) are provided. Here, the spacewidths (22) are in each case arranged symmetrically with respect to a spacewidth axis of symmetry (30), with a rotary disc radius being dependent on a rotational angle and a certain mean radius. The spacewidth axes of symmetry (30) of the rotary disc (10) are aligned towards the local centers of curvature, that is to say towards the center of curvature of the curve at the point at which the spacewidth axis of symmetry (30) intersects the peripheral line of the rotary disc (10). Formed around the rotational axis (12) is a circle axis (14) which is not intersected by any of the spacewidth axes of symmetry (30).
    Type: Application
    Filed: August 7, 2007
    Publication date: October 8, 2009
    Applicant: SCHAEFFLER KG
    Inventor: Roman Kern
  • Publication number: 20090170648
    Abstract: In a timing chain drive unit the tooth pitch of a driven sprocket from which a tension span of the chain travels toward a driving sprocket varies cyclically around the circumference of the driven sprocket and cyclically increases and decreases the length of the tension span in synchronism with load variations imparted to the driven sprocket by a valve-operating camshaft.
    Type: Application
    Filed: December 4, 2008
    Publication date: July 2, 2009
    Applicant: Tsubakimoto Chain Co.
    Inventors: Yoshikazu Nakano, Shunji Sakura, Kohei Kunimatsu
  • Publication number: 20090149287
    Abstract: A rotary component with a rotor having a plurality of teeth arranged around the perimeter of the rotor. Each tooth has a crown and each pair of adjacent teeth has a valley therebetween. The crowns of the teeth lie on a curved envelope forming the perimeter of the rotor. The perimeter of the rotor has a non-circular profile with at least two protruding portions alternating with receding portions, in which the distance between the midpoints of the crowns of each pair of adjacent teeth is substantially the same, the profile of the valley between each pair of adjacent teeth is substantially the same, and the distance between the midpoint of each crown and the axis of the rotor varies around the perimeter to produce the said non-circular profile.
    Type: Application
    Filed: December 8, 2008
    Publication date: June 11, 2009
    Inventor: Witold Gajewski
  • Publication number: 20090054187
    Abstract: A chain drive is provided including a plurality of shafts (2, 4, 5), which are connected to the drive, each having one sprocket (3, 6, 7), and a chain (8) which is guided over the sprockets (3, 6, 7). At least one sprocket (3) is non-circular in order to reduce the chain forces which result from the disturbance vibrations introduced into the drive (1). The chain (8) is formed of links (9, 10, 11) which are connected to one another by pin-like connecting elements (15) and which have connection apertures (12, 13, 14), and the connection apertures (12, 13, 14) of all the links (9, 10, 11) are normally punched.
    Type: Application
    Filed: January 30, 2007
    Publication date: February 26, 2009
    Applicant: SCHAEFFLER KG
    Inventor: Rainer Pflug
  • Publication number: 20080200293
    Abstract: A vibration canceling rotor and a synchronous drive employing such rotors is provided wherein 1.5 order vibrations in the synchronous drive can be reduced by employing the vibration canceling rotor on a rotating member of the synchronous drive that rotates at one half the speed of another rotating member of the drive. To cancel 1.5 order vibrations, the rotor has a three-lobed non-circular radial profile to engage the continuous-loop elongate drive structure of the synchronous drive. To cancel 1.5 order and 3rd order vibrations, the rotor has a six lobed non-circular radial profile overlaid on the three lobed profile to create a non-circular composite profile to engage the continuous-loop elongate drive structure. The continuous-loop elongate drive structure can be a chain or a toothed belt.
    Type: Application
    Filed: October 21, 2005
    Publication date: August 21, 2008
    Applicant: LITENS AUTOMOTIVE PARTNERSHIP
    Inventor: Witold Gajewski
  • Publication number: 20080176688
    Abstract: In a chain transmission, a sprocket having an elastic ring sandwiched between a central hub and an annular toothed outer member, the tooth form is such that the root diameter, that is, the diameter of the tooth gap bottom circle, is greater than the root diameter in a sprocket having a standard ISO tooth form.
    Type: Application
    Filed: December 5, 2007
    Publication date: July 24, 2008
    Applicant: Tsubakimoto Chain Co.
    Inventors: Shunji Sakura, Akira Hirai
  • Publication number: 20080176689
    Abstract: A rotating disk is provided, which can rotate by a rotational angle about a rotational axis (12) and has a number of teeth (20) arranged on a periphery of the rotating disk (10) and tooth spaces (22) located between the teeth, through whose middle runs a tooth-space middle line (30), and the rotating disk (10) has a periodically changing tooth-space geometry. The rotating disk (10) has a tip circle radius (24) that is constant. In addition, a drive device and a belt drive with a rotating disk (10) are provided.
    Type: Application
    Filed: January 23, 2008
    Publication date: July 24, 2008
    Applicant: Schaeffler KG
    Inventors: Frank Rettig, Roman Kern
  • Publication number: 20080161144
    Abstract: In a chain transmission a standard ISO roller chain meshes with a modified sprocket having a root diameter larger than the root diameter of a standard sprocket designed for use with the standard chain. The angular tooth pitches can be either of two kinds. In a first version, the sprocket has two irregularly distributed tooth pitches, ???? and ?+2??, there being two tooth pitches ???? for each tooth pitch ?+2??. In a second version, the sprocket has three angular tooth pitches, ????, ?, and ?+??, in equal numbers, also distributed irregularly.
    Type: Application
    Filed: November 6, 2007
    Publication date: July 3, 2008
    Applicant: Tsubakimoto Chain Co.
    Inventors: Akira Hirai, Shunji Sakura, Shigenobu Sugasawa, Junya Kurohata, Takeshi Ogawa
  • Publication number: 20080085799
    Abstract: A synchronous belt drive system comprising an obround sprocket (10) having a toothed surface and at least one linear portion (16) disposed between two arcuate portions (14,15), the arcuate portions having a constant radius (R1, R2), the linear portion having a predetermined length, a second sprocket (300) having a toothed surface, the second sprocket engaged to the obround sprocket by an endless toothed member (200), the second sprocket connected to a rotary load, the rotary load having cyclic torque fluctuations, and a radius (R1) of the obround sprocket (10) oriented at a belt entry point (201) which coincides with a maximum amplitude of a cyclic torque fluctuation such that a span length (SL) of the endless toothed member is made to vary in a manner that substantially cancels the cyclic torque fluctuations.
    Type: Application
    Filed: October 1, 2007
    Publication date: April 10, 2008
    Inventor: Fraser Lacy
  • Publication number: 20080009377
    Abstract: In a roller or bushing chain transmission a standard roller or bushing chain having a uniform chain pitch meshes with a sprocket having at least two different tooth form pitches.
    Type: Application
    Filed: June 25, 2007
    Publication date: January 10, 2008
    Applicant: Tsubakimoto Chain Co.
    Inventors: Shunji Sakura, Akira Hirai, Masatoshi Sonoda
  • Patent number: 7232391
    Abstract: A synchronous drive apparatus and method, wherein the apparatus comprises a plurality of rotors comprising at least a first and a second rotor. The first rotor has a plurality of teeth for engaging the engaging sections of an elongate drive structure, and the second rotor has a plurality of teeth for engaging the engaging section of the elongate drive structure. A rotary load assembly is coupled to the second rotor. The elongate drive structure engages about the first and second rotors. The first rotor is arranged to drive the elongate drive structure and the second rotor is arranged to be driven by the elongate drive structure. One of the rotors has a non-circular profile having at least two protruding portions alternating with receding portions.
    Type: Grant
    Filed: April 8, 2005
    Date of Patent: June 19, 2007
    Assignee: Litens Automotive
    Inventor: Witold Gajewski
  • Patent number: 7128672
    Abstract: This invention concerns a sprocket gear for facilitating the derailing of the chain of a bicycle transmission and other prime movers. The sprocket gear includes at least two sprockets axially and concentrically positioned relative to one another. Each sprocket includes a perimeter, a front face, and a back face. Gear teeth project axially from at least a first perimeter segment of the front face and at least a second perimeter segment of the front face is free of gear teeth. Gear teeth project axially from the back face perimeter at the at least second segment of the front face. No gear teeth project from the back face perimeter at the at least first perimeter segment of the front face.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: October 31, 2006
    Assignee: Chalin Cluster Corporation
    Inventor: Jesse R. Chattin
  • Patent number: 6905432
    Abstract: A chain drive for pivot chains (7) or round link chains (8) having spur gears (2) and a polygonal chain wheel (10) reduces variations in velocity and acceleration transferred to the chains (7), (8). The driven gear wheel (3a) and the driving gear wheel (4a) consist of noncircular gear wheels having a set gear ratio adjustment so that the driving gear wheel (4a) is put in such a position to the driven gear wheel (3a) so that the slowest angular velocity coincides with the corners (29a) of the polygon of the chain wheel (10) and the fastest angular velocity occurs at the middle of the polygon straight lines (29b) of the chain wheel.
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: June 14, 2005
    Inventor: Jorg Oser
  • Publication number: 20040259675
    Abstract: This invention includes a sprocket assembly for facilitating the derailing of the chain of a bicycle transmission and other prime movers. The first embodiment of the invention relates to a sprocket gear having at least two sprockets axially and concentrically positioned relative to one another. Each sprocket includes a non-circular configuration having at least one long radius and at least one short radius. The sprockets being axially aligned adjacent to one another such that the short radius of one sprocket is axially substantially aligned with and substantially equal in length with said long radius of an adjacent sprocket. The second embodiment of the present invention provides a sprocket assembly having two sprockets with the tooth being displaced by less than one tooth relative to each other. Thus, it is possible to vary the relationship between the teeth of the small sprocket and the chain to engage these teeth without having to vary the phase relationship between the larger and smaller sprockets.
    Type: Application
    Filed: April 16, 2004
    Publication date: December 23, 2004
    Inventor: Jesse R. Chattin
  • Publication number: 20030104886
    Abstract: A synchronous drive apparatus and method, wherein the apparatus comprises a plurality of rotors comprising at least a first and a second rotor. The first rotor has a plurality of teeth for engaging the engaging sections of an elongate drive structure, and the second rotor has a plurality of teeth for engaging the engaging section of the elongate drive structure. A rotary load assembly is coupled to the second rotor. The elongate drive structure engages about the first and second rotors. The first rotor is arranged to drive the elongate drive structure and the second rotor is arranged to be driven by the elongate drive structure. One of the rotors has a non-circular profile having at least two protruding portions alternating with receding portions.
    Type: Application
    Filed: November 15, 2002
    Publication date: June 5, 2003
    Inventor: Witold Gajewski
  • Publication number: 20030083165
    Abstract: In order to provide an operationally reliable compensation in particular for polygon effects, using simple means, the invention proposes a drive to be used for a chain comprising periodically arranged chain links, the drive train of which is driven by a driving motor and has at least one non-circular wheel located on the input side.
    Type: Application
    Filed: September 3, 2002
    Publication date: May 1, 2003
    Applicant: SCHUMAG AKTIENGESELLSCHAFT
    Inventor: Dirk Hessberger
  • Publication number: 20030060316
    Abstract: An adjustable bicycle chain guide device includes a plate mounted to a crank axle and the plate has two protrusions. Two rollers each have an extension and the two extensions are respectively connected to the two protrusions. Each of the extensions has two holes defined therethrough and each of the protrusions has two rows of positioning holes so that the positions of the rollers are adjusted on the protrusions by engaging bolts with different positioning holes.
    Type: Application
    Filed: September 26, 2001
    Publication date: March 27, 2003
    Inventor: Cheng-Xun Jiang
  • Publication number: 20030060315
    Abstract: A bicycle chain guide device includes a plate mounted to the crank axle has two protrusions and each of the protrusions has a first roller and a second roller connected thereto. The chain engaged with a chainwhell passes between the first roller and the second roller on each of the two protrusions.
    Type: Application
    Filed: September 26, 2001
    Publication date: March 27, 2003
    Inventor: Cheng-Xun Jiang
  • Publication number: 20020169043
    Abstract: An elliptic gearing for a bicycle has an elliptic driving gear rotatably mounted at a bottom-front end of a frame of the bicycle by a crank axle extending through the frame. A driven gear is rotatably mounted at a bottom-rear end of the frame. A chain connects the elliptic driving gear and the driven gear. Two cranks extend oppositely and are respectively mounted at two ends of the crank axle. The cranks are parallel to the maximum diameter of and perpendicular to the minimum diameter of the elliptic driving gear. Two pedals are pivotally mounted on distal ends of the cranks respectively. An adjusting device is mounted beneath the driven gear and connected to the driving and the driven gear by the chain.
    Type: Application
    Filed: May 7, 2002
    Publication date: November 14, 2002
    Inventor: Chieh-I Liu
  • Publication number: 20020142873
    Abstract: A chain drive for pivot chains (7) or round link chains (8) having spur gears (2) and a polygonal chain wheel (10) reduces variations in velocity and acceleration transferred to the chains (7), (8). The driven gear wheel (3a) and the driving gear wheel (4a) consist of noncircular gear wheels having a set gear ratio adjustment so that the driving gear wheel (4a) is put in such a position to the driven gear wheel (3a) so that the slowest angular velocity coincides with the corners (29a) of the polygon of the chain wheel (10) and the fastest angular velocity occurs at the middle of the polygon straight lines (29b) of the chain wheel.
    Type: Application
    Filed: January 4, 2002
    Publication date: October 3, 2002
    Inventor: Jorg Oser
  • Patent number: 5971721
    Abstract: An energy efficient high pressure pump system includes a drive motor driving an eccentric transmission, which drives a reciprocation pump having a number of cylinders. The eccentric transmission transmits a torque demand from the reciprocating pump, which varies with time, to the drive motor such that the torque demand on the drive motor is substantially constant. The pump system includes an eccentric sprocket mounted on the output shaft of a drive motor and driving an eccentric sprocket on an idler which includes a concentric sprocket driving a concentric sprocket on the reciprocating pump with the eccentricity of the eccentric sprockets being proportional to the maximum and minimum torque demand characteristics of the reciprocating pump.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: October 26, 1999
    Assignee: Thermo Fibertek Inc.
    Inventor: Peter T. Carstensen
  • Patent number: 5899477
    Abstract: A drive mechanism applicable to bicycles for increasing the efficiency of pedaling action via independent pedals with a sinusoidally varying transmission ratio. The drive mechanism achieves increased efficiency by making the pedals independently synchronized with a varying transmission ratio so that the coincidence of both legs in dead centers is avoided when one pedal is in an upper and the other pedal is in a lower position, making the pedal which is going up move more rapidly than the pedal going down.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: May 4, 1999
    Assignee: Rotor Componentes Tecnologicos S.L.
    Inventor: Pablo Carrasco Vergara