Patents Assigned to Tsubakimoto Chain Co.
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Publication number: 20090209376Abstract: In a hydraulic tensioner, at least a part of a bar is located within a coil spring that biases a plunger in the protruding direction. The bar reduces the volume of the high pressure oil chamber of the tensioner.Type: ApplicationFiled: January 15, 2009Publication date: August 20, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventors: Yuji Kurematsu, Takeshi Ogawa
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Publication number: 20090209380Abstract: A sprocket for a chain drive using a roller or bushing chain has a plurality of different pitch angles, including both pitch angles larger than the standard pitch angle, and pitch angles smaller than the standard pitch angle. The number of pitch angles in the sprocket larger than the standard pitch angle is greater than the number of pitch angles in the sprocket smaller than the standard pitch angle.Type: ApplicationFiled: January 31, 2009Publication date: August 20, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventors: Akira Hirai, Shunji Sakura
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Publication number: 20090209377Abstract: In a hydraulic tensioner having a coiled plunger-biasing spring, the volume of the high pressure oil chamber is reduced by incorporating a bar inside the spring. One of both ends of the spring are formed to block passage of the bar, so that the bar and spring can be installed as a pre-assembled unit, and dropping of the bar out of the spring can be avoided.Type: ApplicationFiled: January 15, 2009Publication date: August 20, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventors: Yuji Kurematsu, Katsuji Shigematsu
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Publication number: 20090209378Abstract: The hollow plunger of a hydraulic tensioner, slidably receives a sleeve that divides the high pressure oil chamber into two parts. The first part is formed by the plunger and a plunger-accommodating hole of the tensioner housing. The second part is formed by the plunger and the sleeve. Two springs, one being in the first part, and the other being in the second part, urge the plunger in the protruding direction. When the second part is filled with oil during ordinary engine operation, a negative pressure in the second part exerts a force opposing protruding movement of the plunger. Therefore, the springs can be made strong enough to prevent excessive chain vibration and noise during engine start-up when the parts of the high pressure oil chamber are not filled with oil, without causing the tensioner to exert excessive force on the chain during ordinary engine operation.Type: ApplicationFiled: January 16, 2009Publication date: August 20, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventor: Yuji Kurematsu
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Publication number: 20090186731Abstract: In a silent chain having guide rows composed of guide plates, and inner guide row plates, and connected, by connecting pins, in alternating, interleaved relationship with plates of non-guide rows, the pitches of the pin holes in the plates of each non-guide row vary with increasing distance from the guide plates. Optionally the pitches of the inner plates in the guide rows can also vary with increasing distance from the guide plates. The pin holes of the non-centrally located non-guide row plates, and optionally, the pin holes of the non-centrally located inner guide row plates, can also be slanted to conform to the surfaces of the connecting pins when the pins are flexed as a result of tensile force applied to the chain.Type: ApplicationFiled: December 16, 2008Publication date: July 23, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventor: Takashi Tohara
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Publication number: 20090186729Abstract: In a silent chain, interleaved toothed link plates in guide rows and non-guide rows are articulably connected by connecting pins fixed to guide plates at the outer ends of the guide rows. In each guide row, the connecting pins are bent in such a way that the central portions of the connecting pins are closer to each other than the end portions when the chain is under moderate tension or no tension. As greater tension is applied to the chain, the bent connecting pins become substantially straight and are brought into substantially uniform contact with pin holes in the plates.Type: ApplicationFiled: December 12, 2008Publication date: July 23, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventor: Takashi Tohara
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Publication number: 20090186732Abstract: In a silent chain having guide rows composed of guide plates, and inner guide row plates, the guide row plates being connected, by connecting pins, in alternating, interleaved relationship with plates of non-guide rows, the diameters of the pin holes in the plates of each non-guide row vary with increasing distance from the guide plates. Optionally the diameters of the inner plates in the guide rows can also vary with increasing distance from the guide plates.Type: ApplicationFiled: December 16, 2008Publication date: July 23, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventors: Takashi Tohara, Toyonaga Saito
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Publication number: 20090186730Abstract: In a silent chain, the outer diameter of each connecting pin gradually increases from its ends toward a central region at an intermediate location between its ends, whereby the diameter of each pin is greatest in its central region. The pin holes of the inner plates can have the same inner diameter, which can be slightly larger than the largest outer diameter of the connecting pins. The gradual increase in the outer diameter of each pin is sufficiently small that, when a tensile load is applied to the chain, a connecting pin can be flexed by abutting inner surfaces of the pin holes of the chain's non-guide row plates, by an amount sufficient to make the abutment region of the pin substantially straight and in substantially uniform contact with the abutting inner surfaces of the pin holes.Type: ApplicationFiled: December 12, 2008Publication date: July 23, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventor: Takashi Tohara
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Patent number: 7563188Abstract: A conveyor chain comprising a number of chain links mutually connected in the chain longitudinal direction, each chain link having a plurality of hinge parts comprising laterally-spaced hinge parts in the form of finger members protruding in laterally-spaced relation from a front edge and a rear edge as an integrally molded unit; and a ball unit holding a ball which is free to be rotated while being exposed to both sides of the chain link, the ball unit being detachably installed in a U-shaped mounting region open at one end between the hinge parts and closed at the other end. The finger members of each link are interdigitated with the finger members of the adjacent links, and are retained by a hinge pin. Removal of the ball unit is facilitated by a tool-inserting slot at the other end of the U-shaped region.Type: GrantFiled: March 14, 2006Date of Patent: July 21, 2009Assignee: Tsubakimoto Chain Co.Inventors: Hajime Ozaki, Katsutoshi Shibayama, Yoshihiro Murakami
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Patent number: 7559340Abstract: A tube type cable protection and guide device in which the device can be easily manufactured by extrusion molding without changing the size of a mold so that devices of different lengths can be made. Smooth linear and flexional movements can be made while sufficiently ensuring dimensional stability and torsional rigidity of the device thus assuring stability of the cable accommodating space. A tube type cable protection and guide device includes integrally molded inner circumferential wall forming portions. The inner wall forming portions are interdigitatedly fitted in a male-female relationship in a longitudinal direction of the sheet forming a flush inner flat surface.Type: GrantFiled: February 1, 2008Date of Patent: July 14, 2009Assignee: Tsubakimoto Chain Co.Inventors: Masaaki Ikeda, Shoichiro Komiya, Katsuhide Yamashita, Takayuki Matsuda
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Publication number: 20090170648Abstract: 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: ApplicationFiled: December 4, 2008Publication date: July 2, 2009Applicant: Tsubakimoto Chain Co.Inventors: Yoshikazu Nakano, Shunji Sakura, Kohei Kunimatsu
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Publication number: 20090156339Abstract: In an engine timing transmission, one end of a unitary molded glass fiber-reinforced resin chain guide is pivotally supported on a bolt fixed to an engine block. A supporting portion adjacent the opposite end of the chain guide is in abutting relationship with the engine block. An intermediate supporting portion on the chain guide is spaced from the engine block, but, when tension in the chain increases, the chain guide flexes, allowing the intermediate supporting portion to come into abutting relationship with the engine block. Through holes in the chain guide allow deformation of the supporting portions.Type: ApplicationFiled: October 20, 2008Publication date: June 18, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventor: Masanori Yokoyama
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Patent number: 7546725Abstract: Link plates of a silent chain are produced by first shaving the inner surfaces of the connecting pin holes, the sprocket tooth-engaging surfaces, and the backs of the link plates, and then forming dimples on those surfaces by shot-peening.Type: GrantFiled: June 2, 2006Date of Patent: June 16, 2009Assignee: Tsubakimoto Chain Co.Inventors: Kazuhiko Shimaya, Kenichi Nagao, Toshitaka Ogo
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Publication number: 20090149288Abstract: In a silent chain having interleaved guide rows and joint rows, guide plates at the outer sides of the guide rows are connected by engagement pins which extend through overlapping recesses formed on the outer flanks of the guide row plates, and on the inner flanks of the joint row plates. The engagement pins contact sprocket teeth before the outer flanks of the guide row plates contact the sprocket teeth. Cutouts formed in the guide plates adjacent the engagement pins allow the guide plates to deform and thereby absorb the impact imparted to the engagement pins by the sprocket teeth.Type: ApplicationFiled: November 7, 2008Publication date: June 11, 2009Applicant: Tsubakimoto Chain Co.Inventors: Masatoshi Sonoda, Takayuki Morimoto
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Publication number: 20090143177Abstract: In an engine timing chain drive, a pivoted chain guide is provided on the tension side of the chain, and a synchronizing sprocket is incorporated into the chain guide and driven by the chain. The synchronizing sprocket rotates a cam which effects reciprocating movement of the guide to compensate for cyclic variations in tension resulting from operation of intake and exhaust valves.Type: ApplicationFiled: November 13, 2008Publication date: June 4, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventors: Yoshikazu Nakano, Kouhei Kunimatsu, Hiroshi Hashimoto
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Patent number: 7540816Abstract: In a plastic hydraulic tensioner having an oil reservoir formed as a recess in a portion of a synthetic resin tensioner body adapted to engage a tensioner mounting surface on an engine block, metal bushings are insert-molded in the synthetic resin tensioner body for receiving mounting bolts by which the tensioner is secured to an engine block. The outer circumferential surface of each bushing is provided with at least one flat portion or at least one concave groove, and a protruding portion of the bushing is formed adjacent the end of the flat or groove remote from the engine block-contacting end of the bushing.Type: GrantFiled: June 13, 2006Date of Patent: June 2, 2009Assignee: Tsubakimoto Chain Co.Inventor: Osamu Yoshida
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Patent number: 7540817Abstract: A tensioner for maintaining tension in a timing chain or belt comprises a pivotally mounted lever body biased in a direction to increase tension in the chain or belt, and having a built-in, one-way clutch permitting the lever to pivot the tension-increasing direction but blocking pivoting movement in the opposite direction.Type: GrantFiled: November 1, 2004Date of Patent: June 2, 2009Assignee: Tsubakimoto Chain Co.Inventors: Hiroshi Hashimoto, Masaki Kato
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Patent number: 7537044Abstract: A guide for a traveling transmission medium such as a timing chain comprises a resin shoe for sliding contact with the transmission medium, supported on a base frame having an two flanges and a web in an I-shaped cross-section. The base frame is produced from aluminum by die casting, using a three-part mold. Two parts of the mold cooperate to form a part of the mold cavity that forms one of the flanges and the web of the base frame, and a third part of the mold cooperates with the first two parts to form a part of the cavity in which the other flange of the base frame is formed without a draft.Type: GrantFiled: July 5, 2006Date of Patent: May 26, 2009Assignee: Tsubakimoto Chain Co.Inventors: Yuji Kurematsu, Toshihiko Komiyama, Kenji Mitsuhashi, Toshiji Aota
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Publication number: 20090131209Abstract: In a rocker joint silent chain, the link plates have two different engagement pitches, and the connecting pins are composed of combinations of rocker pins and joint pins, where each rocker pin has one of two thicknesses and each joint pin has one of two thicknesses, so that the rocker joint pins of the chain have three different thicknesses. The link plates and connecting pins are arranged randomly along the length of the chain.Type: ApplicationFiled: September 4, 2008Publication date: May 21, 2009Applicant: TSUBAKIMOTO CHAIN CO.Inventors: Takayuki Morimoto, Hitoshi Ohara, Minoru Komada, Kazufumi Kotani, Shuuji Hamaguchi
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Patent number: 7534182Abstract: In a sprocket for a chain transmission, teeth are disposed around the circumference of the sprocket at intervals. Arc-shaped tooth gap bottoms are formed between adjacent teeth, and each tooth gap bottom is continuous with the facing tooth surfaces of its adjacent teeth. Each tooth is formed so that its thickness is greater than the thickness of an ISO tooth form and gradually becomes thinner from the pitch line toward the tooth head. At engagement of the chain with the sprocket, a roller first comes into contact with a back tooth surface so that polygonal movement is suppressed.Type: GrantFiled: November 1, 2005Date of Patent: May 19, 2009Assignee: Tsubakimoto Chain Co.Inventor: Masatoshi Sonoda
