Patents by Inventor Darren J. Stewart
Darren J. Stewart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9377082Abstract: An inverted tooth chain and sprocket drive system in which the initial contact distance ICD, the meshing impact angle Sigma (?), the link plate entrance angle Beta (?), and other aspects of the meshing geometry are controlled and optimized to reduce noise and vibration by using a particular chain link plate form and, in preferred cases, by modifying the sprocket tooth pressure angle. The system can include first and second sprockets for which the pressure angle can be controlled to ensure that the desired values for the initial contact distance ICD, the meshing impact angle Sigma (?), and the link plate entrance angle Beta (?) are equal for both sprockets even though the sprockets have different tooth counts. For a chain pitch P in the range of 6.35 mm to 8.0 mm, the initial contact distance ICD is controlled such that 0.49P?ICD?0.53P, the meshing impact angle Sigma (?) is controlled such that ??34°, and the link plate entrance angle Beta (?) is controlled such that ??9°.Type: GrantFiled: March 17, 2014Date of Patent: June 28, 2016Assignee: Cloyes Gear and Products, Inc.Inventors: James D. Young, Darren J. Stewart
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Publication number: 20140200106Abstract: An inverted tooth chain and sprocket drive system in which the initial contact distance ICD, the meshing impact angle Sigma (?), the link plate entrance angle Beta (?), and other aspects of the meshing geometry are controlled and optimized to reduce noise and vibration by using a particular chain link plate form and, in preferred cases, by modifying the sprocket tooth pressure angle. The system can include first and second sprockets for which the pressure angle can be controlled to ensure that the desired values for the initial contact distance ICD, the meshing impact angle Sigma (?), and the link plate entrance angle Beta (?) are equal for both sprockets even though the sprockets have different tooth counts. For a chain pitch P in the range of 6.35 mm to 8.0 mm, the initial contact distance ICD is controlled such that 0.49P?ICD?0.53P, the meshing impact angle Sigma (?) is controlled such that ??34°, and the link plate entrance angle Beta (?) is controlled such that ??9°.Type: ApplicationFiled: March 17, 2014Publication date: July 17, 2014Applicant: Cloyes Gear and Products, Inc.Inventors: James D. Young, Darren J. Stewart
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Patent number: 8672786Abstract: An inverted tooth chain and sprocket drive system in which the initial contact distance ICD, the meshing impact angle Sigma (?), the link plate entrance angle Beta (?), and other aspects of the meshing geometry are controlled and optimized to reduce noise and vibration by using a particular chain link plate form and, in preferred cases, by modifying the sprocket tooth pressure angle. The system can include first and second sprockets for which the pressure angle can be controlled to ensure that the desired values for the initial contact distance ICD, the meshing impact angle Sigma (?), and the link plate entrance angle Beta (?) are equal for both sprockets even though the sprockets have different tooth counts. For a chain pitch P in the range of 6.35 mm to 7.7 mm, the initial contact distance ICD is controlled such that 0.49 P?ICD?0.53 P, the meshing impact angle Sigma (?) is controlled such that ??34°, and the link plate entrance angle Beta (?) is controlled such that ??9°.Type: GrantFiled: March 9, 2011Date of Patent: March 18, 2014Assignee: Cloyes Gear and Products, Inc.Inventors: James D. Young, Darren J. Stewart
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Patent number: 8641565Abstract: An inverted tooth chain drive system includes an inverted tooth chain structured for inside flank engagement. The chain includes link rows each including leading inside flanks that project outwardly relative to trailing outside flanks of a preceding link row. The system further includes a sprocket with which said inverted tooth chain is drivingly engaged. The sprocket includes a plurality of teeth circumferentially spaced about an axis of rotation, each tooth comprising an engaging flank and a disengaging flank. Some of the teeth are defined with a first tooth form in which said engaging flank thereof is defined with a first pressure angle and others of said teeth are defined with a second tooth form in which the engaging flank thereof is defined with a second pressure angle that is different from the first pressure angle in order to stagger or modulate the initial meshing impacts between the leading inside flanks of the chain and engaging flanks of the sprocket teeth.Type: GrantFiled: May 9, 2008Date of Patent: February 4, 2014Assignee: Cloyes Gear and Products, Inc.Inventors: James D. Young, Darren J. Stewart, John E. Minden
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Patent number: 8628440Abstract: An inverted tooth chain drive system defines a meshing contact angle Tau (?) between the tangent line TL and an initial contact reference line that passes through a controlling pin center and the initial contact location. A link plate entrance angle Beta (?) is defined between the initial contact reference line and an inside flank reference line that passes through an arc center of the inside flank radius and the initial contact location. A meshing impact angle Sigma (?) is defined between the tangent line and the inside flank reference line such that ?=?+?, wherein ??9° and ??34°. The pressure angle of the sprocket tooth can be adjusted and the chain optimized such that ??7° and ??31°. The system thus provides a reduction of the link impact force FL and the resultant impact energy E. The inverted tooth chain, itself, defines a pitch P and an inside flank projection Lamda (?) such that 0.007×P???0.017×P when said chain is pulled straight.Type: GrantFiled: September 9, 2009Date of Patent: January 14, 2014Assignee: Cloyes Gear and Products, Inc.Inventors: James D. Young, Darren J. Stewart
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Patent number: 8617012Abstract: A chain tensioner assembly includes a bracket with a main wall and a ramp surface. A blade assembly is connected to the bracket and includes a blade located adjacent the main wall of the bracket. The blade includes: (i) a first blade end with a pivot aperture; (ii) a second blade end contacting the ramp surface; and, (iii) a central blade portion that extends between the first and second blade ends. The central blade portion includes a chain engaging surface. A first spring-retaining slot is located in the first blade end and includes inner and outer open sides that open respectively through inner and outer faces of the blade. A second spring-retaining slot is located in the second blade end. A spring includes a first end located in the first spring-retaining slot, a second end located in the second spring-retaining slot; and, a central portion that abuts the central blade portion.Type: GrantFiled: November 18, 2009Date of Patent: December 31, 2013Assignee: Cloyes Gear and Products, Inc.Inventors: James D. Young, Darren J. Stewart
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Patent number: 8529389Abstract: An inverted tooth chain and sprocket drive system in which the initial contact distance ICD, the meshing impact angle Sigma (?), the link plate entrance angle Beta (?), and other aspects of the meshing geometry are controlled and optimized to reduce noise and vibration by using a particular chain link plate form and, in preferred cases, by modifying the sprocket tooth pressure angle. The system can include first and second sprockets for which the pressure angle can be controlled to ensure that the desired values for the initial contact distance ICD, the meshing impact angle Sigma (?), and the link plate entrance angle Beta (?) are equal for both sprockets even though the sprockets have different tooth counts. For a chain pitch P in the range of 6.35 mm to 7.7 mm, the initial contact distance ICD is controlled such that 0.49P?ICD?0.53P, the meshing impact angle Sigma (?) is controlled such that ??34°, and the link plate entrance angle Beta (?) is controlled such that ??9°.Type: GrantFiled: June 14, 2010Date of Patent: September 10, 2013Assignee: Cloyes Gear and Products, Inc.Inventors: James D. Young, Darren J. Stewart
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Publication number: 20110183799Abstract: An inverted tooth chain and sprocket drive system in which the initial contact distance ICD, the meshing impact angle Sigma (?), the link plate entrance angle Beta (?), and other aspects of the meshing geometry are controlled and optimized to reduce noise and vibration by using a particular chain link plate form and, in preferred cases, by modifying the sprocket tooth pressure angle. The system can include first and second sprockets for which the pressure angle can be controlled to ensure that the desired values for the initial contact distance ICD, the meshing impact angle Sigma (?), and the link plate entrance angle Beta (?) are equal for both sprockets even though the sprockets have different tooth counts. For a chain pitch P in the range of 6.35 mm to 7.7 mm, the initial contact distance ICD is controlled such that 0.49 P?ICD?0.53 P, the meshing impact angle Sigma (?) is controlled such that ??34°, and the link plate entrance angle Beta (?) is controlled such that ??9°.Type: ApplicationFiled: March 9, 2011Publication date: July 28, 2011Inventors: James D. Young, Darren J. Stewart
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Publication number: 20110021299Abstract: An inverted tooth chain and sprocket drive system in which the initial contact distance ICD, the meshing impact angle Sigma (?), the link plate entrance angle Beta (?), and other aspects of the meshing geometry are controlled and optimized to reduce noise and vibration by using a particular chain link plate form and, in preferred cases, by modifying the sprocket tooth pressure angle. The system can include first and second sprockets for which the pressure angle can be controlled to ensure that the desired values for the initial contact distance ICD, the meshing impact angle Sigma (?), and the link plate entrance angle Beta (?) are equal for both sprockets even though the sprockets have different tooth counts. For a chain pitch P in the range of 6.35 mm to 7.7 mm, the initial contact distance ICD is controlled such that 0.49P?ICD?0.53P, the meshing impact angle Sigma (?) is controlled such that ??34°, and the link plate entrance angle Beta (?) is controlled such that ??9°.Type: ApplicationFiled: June 14, 2010Publication date: January 27, 2011Inventors: James D. Young, Darren J. Stewart
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Publication number: 20100210384Abstract: A chain tensioner assembly includes a bracket with a main wall and a ramp surface. A blade assembly is connected to the bracket and includes a blade located adjacent the main wall of the bracket. The blade includes: (i) a first blade end with a pivot aperture; (ii) a second blade end contacting the ramp surface; and, (iii) a central blade portion that extends between the first and second blade ends. The central blade portion includes a chain engaging surface. A first spring-retaining slot is located in the first blade end and includes inner and outer open sides that open respectively through inner and outer faces of the blade. A second spring-retaining slot is located in the second blade end. A spring includes a first end located in the first spring-retaining slot, a second end located in the second spring-retaining slot; and, a central portion that abuts the central blade portion.Type: ApplicationFiled: November 18, 2009Publication date: August 19, 2010Inventors: James D. Young, Darren J. Stewart
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Publication number: 20100069187Abstract: An inverted tooth chain drive system defines a meshing contact angle Tau (?) between the tangent line TL and an initial contact reference line that passes through a controlling pin center and the initial contact location. A link plate entrance angle Beta (?) is defined between the initial contact reference line and an inside flank reference line that passes through an arc center of the inside flank radius and the initial contact location. A meshing impact angle Sigma (?) is defined between the tangent line and the inside flank reference line such that ?=?+?, wherein ??9° and ??34°. The pressure angle of the sprocket tooth can be adjusted and the chain optimized such that ??7° and ??31°. The system thus provides a reduction of the link impact force FL and the resultant impact energy E. The inverted tooth chain, itself, defines a pitch P and an inside flank projection Lamda (?) such that 0.007×P???0.017×P when said chain is pulled straight.Type: ApplicationFiled: September 9, 2009Publication date: March 18, 2010Inventors: James D. Young, Darren J. Stewart
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Publication number: 20080312017Abstract: An inverted tooth chain drive system includes an inverted tooth chain structured for inside flank engagement. The chain includes link rows each including leading inside flanks that project outwardly relative to trailing outside flanks of a preceding link row. The system further includes a sprocket with which said inverted tooth chain is drivingly engaged. The sprocket includes a plurality of teeth circumferentially spaced about an axis of rotation, each tooth comprising an engaging flank and a disengaging flank. Some of the teeth are defined with a first tooth form in which said engaging flank thereof is defined with a first pressure angle and others of said teeth are defined with a second tooth form in which the engaging flank thereof is defined with a second pressure angle that is different from the first pressure angle in order to stagger or modulate the initial meshing impacts between the leading inside flanks of the chain and engaging flanks of the sprocket teeth.Type: ApplicationFiled: May 9, 2008Publication date: December 18, 2008Inventors: James D. Young, Darren J. Stewart, John E. Minden