Patents Assigned to Yamada Manufacturing Co., Ltd.
  • Method for manufacturing closed impeller
    Patent number: 8793872
    Abstract: The present invention provides a method for manufacturing a closed impeller that has a simple configuration and enables fusion in a very accurate position. The method includes: forming a frustum-shaped front plate and a disk-shaped base plate formed therebelow, upper surfaces of a plurality of unit impeller blade plates made from a synthetic resin extending in radial directions which are formed as impeller blade tip surfaces, with sharp-pointed ridge-like protrusions having an acute upper end and a width less than a width of the impeller blade tip surface being integrally formed on the impeller blade tip surfaces. In the method, an inner surface of the front plate and the plurality of impeller blade tip surfaces are formed as parts of conical surfaces and formed so that the cone apex angles of the two conical surfaces are equal to each other.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: August 5, 2014
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Ryouhei Adachi, Song Fei, Hisayoshi Ono
  • Relief device for oil pump
    Patent number: 8763634
    Abstract: A relief device includes a relief housing constituted by a relief inflow portion, a valve passage portion, a recess, and an oil discharge portion having a relief hole; a relief valve having a small-diameter portion between a first large-diameter portion and a second large-diameter portion; and a spring elastically biasing the relief valve toward the relief inflow portion. The recess is formed at a position that is closer to the relief inflow portion side than to the oil discharge portion, the axial length of the recess is larger than the axial length of the first large-diameter portion of the relief valve, and the shortest axial distance between the recess and the relief hole is less than the axial length of the small-diameter portion.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: July 1, 2014
    Assignees: Honda Motor Co., Ltd., Yamada Manufacturing Co., Ltd.
    Inventors: Nobuyuki Akaishi, Masataka Ikawa, Yasuhiro Ueta, Takuji Ishioka, Hidehiko Kamiyama, Takuya Yamazaki, Yoshiro Umezawa, Hirokazu Inoue, Yoshitaka Kurokawa
  • INTERNAL GEAR PUMP
    Publication number: 20140154119
    Abstract: The internal gear pump includes: an inner rotor; an outer rotor that rotates by having predetermined eccentricity to a rotation center of the inner rotor; an outer ring that holds the outer rotor in a freely rotatable state, and is also formed with at least three cam protruded parts; a pump housing having a rotor chamber; protruded-wall surface parts that are formed on an inner periphery side surface of the rotor chamber and are also formed in the same number as that of the cam protruded parts; and operation means for oscillating the outer ring. A diameter center of the holding-inner peripheral part of the outer ring is moved by the operation means along a locus of a circle of which a radius is the eccentricity to the rotation center of the inner rotor.
    Type: Application
    Filed: November 22, 2013
    Publication date: June 5, 2014
    Applicant: Yamada Manufacturing Co., Ltd
    Inventors: Masato Izutsu, Takatoshi Watanabe, Junichi Miyajima
  • INTERNAL GEAR PUMP
    Publication number: 20140154120
    Abstract: The internal gear pump according to the present invention includes: an inner rotor; an outer rotor that rotates with predetermined eccentricity to a rotation center of the inner rotor; an outer ring that rotatably holds the outer rotor, and has at least three cam protruded parts formed; a pump housing that has a rotor chamber; pins in the same number as that of the cam protruded parts; and operation means for oscillating the outer ring. Positions of the pins are set so that a diameter center of the holding-inner peripheral part of the outer ring is moved by the operation means along a locus of a circle, the radius of which is the eccentricity to the rotation center of the inner rotor.
    Type: Application
    Filed: November 22, 2013
    Publication date: June 5, 2014
    Applicant: YAMADA MANUFACTURING CO., LTD
    Inventors: Masato Izutsu, Takatoshi Watanabe, Junichi Miyajima, Yasuhiro Kosugi, Kosuke Yamane
  • STATOR AND ELECTRIC MOTOR HAVING THE SAME
    Publication number: 20140145544
    Abstract: The stator of the electric motor comprises: a stator core; tooth sections being radially extended from the stator core; an even number of slots, each of which is formed between the tooth sections; an insulator covering the tooth sections; and motor coils being wound in the slots. The insulator has guide projections, each of which corresponds to each of the tooth sections so as to guide a magnet wire. The guide projections have guide sections, each of which includes a base end part and a front end part. In each of the guide sections, a radial thickness of at least one part located in the base end part is thin, a radial thickness of the front end part is thicker than that of the base end part. The guide sections are formed in same side faces of the guide projections arranged in the circumferential direction.
    Type: Application
    Filed: November 4, 2013
    Publication date: May 29, 2014
    Applicants: YAMADA MANUFACTURING CO., LTD., SHINANO KENSHI KABUSHIKI KAISHA
    Inventors: Masayuki Kodani, Nobuchika Maruyama, Keisuke Wakabayashi, Nobuyuki Kabasawa, Yasuaki Motegi, Daisuke Kiryu
  • STEERING APPARATUS
    Publication number: 20140076091
    Abstract: The steering apparatus includes an inner column, a left-right pair of outer column half bodies, a fixing bracket having fixing side portions, and a clamping tool. In a condition where the inner column is clamped fixedly via the clamping tool, the inner column is held by the holding surface portions of the two outer column half bodies, and an upper recessed indentation portion and a lower recessed indentation portion that do not contact the inner column are formed on the respective holding surface portions of the two outer column half bodies. Strip-form contact portions that contact the inner column are formed in locations on either circumferential direction side of the upper recessed indentation portion and the lower recessed indentation portion, the strip-form contact portions being formed in at least four locations on the two outer column half bodies.
    Type: Application
    Filed: September 6, 2013
    Publication date: March 20, 2014
    Applicant: Yamada Manufacturing Co., Ltd.
    Inventors: Norihiko Yokota, Takahiro Maniwa
  • ENGINE LUBRICATION CONTROL SYSTEM
    Publication number: 20140060477
    Abstract: The present invention provides an engine lubrication control system including an engine, an oil pump which is driven by the engine, an oil circuit which extends downstream from the oil pump, and a plurality of oil branch supply paths which branch from the oil circuit and supply oil to each part of the engine. An electronically-controlled first hydraulic control valve which controls, in a stepwise manner, a discharge pressure of the oil pump relative to a speed of the engine is disposed on the oil circuit, a hydraulically-driven second hydraulic control valve is disposed on at least one of the plurality of oil branch supply paths, and a downstream hydraulic pressure of the second hydraulic control valve is controlled to be lower than a downstream hydraulic pressure of the first hydraulic control valve of the oil circuit at least across a predetermined engine speed range.
    Type: Application
    Filed: August 28, 2013
    Publication date: March 6, 2014
    Applicant: YAMADA MANUFACTURING CO., LTD
    Inventors: Takatoshi Watanabe, Hidehiko Koyashiki, Junichi Miyajima
  • ENGINE LUBRICATION CONTROL SYSTEM
    Publication number: 20140060476
    Abstract: The present invention provides an engine lubrication control system including an engine, an oil pump which is driven by the engine, an oil circuit which extends downstream from the oil pump, and a plurality of oil branch supply paths which branch from the oil circuit and supply oil to each part of the engine. An electronically-controlled first hydraulic control valve which controls, in a stepwise manner, a discharge pressure of the oil pump relative to a speed of the engine is disposed on the oil circuit, a hydraulically-driven second hydraulic control valve is disposed on at least one of the plurality of oil branch supply paths, and a downstream hydraulic pressure of the second hydraulic control valve is controlled to be lower than a downstream hydraulic pressure of the first hydraulic control valve of the oil circuit at least across a predetermined engine speed range.
    Type: Application
    Filed: August 28, 2013
    Publication date: March 6, 2014
    Applicant: Yamada Manufacturing Co., Ltd.
    Inventors: Takatoshi Watanabe, Hidehiko Koyashiki, Junichi Miyajima
  • Impeller for water pump
    Patent number: 8641378
    Abstract: A present invention's object is to maintain a discharge performance by making a discharge flow rate constant in a low rotation region of an engine rotation speed and to reduce the discharge flow rate in a high rotation region. The present invention consists of a housing case, an impeller base provided with plural holes and plural elliptical elongated holes, a vane body provided with a rotary shaft on an inner peripheral side and a rocking shaft on an outer peripheral side, a plate cam in which an elongated groove is formed on an outer peripheral side of a disc portion and a single torsion spring. The spring and the plate cam are housed in the housing case and the impeller base. The rotary shaft is inserted rotatably into the holes, and the rocking shaft is movably inserted into the elliptical elongated holes and the elongated groove.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: February 4, 2014
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Song Fei, Masayuki Doki
  • STEERING DEVICE
    Publication number: 20140026707
    Abstract: A steering device includes: a column pipe; an outer housing having a clamping portion; a pair of stopper plates; a fastener having a bolt shaft that is mounted on the clamping portion so as to fasten the clamping portion to thereby fix the column pipe; and a buffer member. The buffer member is mounted on any one of the pair of facing stopper plates and the bolt shaft and makes contact with the other by mutual displacement, and a plurality of projection ribs having a triangular cross-sectional shape is formed on a contacting surface of the buffer member.
    Type: Application
    Filed: July 23, 2013
    Publication date: January 30, 2014
    Applicant: YAMADA MANUFACTURING CO., LTD
    Inventors: Norihiko YOKOTA, Yoshiyuki Satou, Noriyuki Watanabe
  • Oil pump unit with variable flow rate
    Patent number: 8616857
    Abstract: An oil pump unit with a variable flow rate includes lubrication pumps and a control pump that are driven by rotation of a crankshaft of an engine, and changes an oil supply amount from the control pump to each part of the engine, in which the control pump includes a plurality of oil pumps that have different discharge rates.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: December 31, 2013
    Assignees: Yamada Manufacturing Co., Ltd., Honda Motor Co., Ltd.
    Inventors: Keiichi Kai, Junichi Miyajima, Noriyuki Kawamata, Toshimasa Mitsubori, Satoshi Ino
  • Steering apparatus
    Patent number: 8616580
    Abstract: A steering apparatus has a steering shaft 7, an inner column 2 that supports the steering shaft 7 via a bearing 81, an outer column A that embraces the inner column 2, a fixing bracket 1 that sandwiches the outer column A from both sides in a width direction, and a tightener 6 that tightens and releases the outer column A together with the fixing bracket 1. The inner column 2 has an embraced cylindrical section 21 that is embraced by the outer column A. A relief section 212 having an outer diameter that is formed smaller than other portions of the embraced cylindrical section 21 is formed in a middle region of the embraced cylindrical section 21 in an axial direction, and the bearing 81 that pivotally supports the steering shaft 7 is fixed to an inner circumferential side of the relief section 212.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: December 31, 2013
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Takahiro Maniwa, Norihiko Yokota
  • ROTOR FOR OIL PUMP
    Publication number: 20130323106
    Abstract: A rotor for an oil pump according to the present invention is a rotor that includes an inner rotor configured by teeth, each of which has a plurality of ellipses or circles, and an outer rotor that is disposed on the outside of the inner rotor and has one tooth more than the inner rotor, wherein, in a tooth of the inner rotor, a tooth top and a tooth root of a drive-side half-tooth region extending from the tooth top to the tooth root and a tooth top and a tooth root of a non-drive-side half-tooth region extending from the tooth top to the tooth root are each configured by a different ellipse or a circle. A circumferential axis along a circumferential direction of the ellipse or circle configuring the tooth top is longer in the non-drive-side half-tooth region than in the drive-side half-tooth region.
    Type: Application
    Filed: May 28, 2013
    Publication date: December 5, 2013
    Applicant: YAMADA MANUFACTURING CO., LTD
    Inventors: Kenichi Fujiki, Masato IZUTSU, Takatoshi WATANABE
  • Steering position adjustment device
    Patent number: 8596161
    Abstract: A spring for assisting a tilt adjustment operation can be easily and rapidly attached to a fixed bracket and a movable bracket. Each of two flanges of a fixed bracket has a tilted flange plate and a locking piece. The locking piece has a guiding edge, a locking recess, an insertion recess, and a fixing hole. In a spring member, a first locking shaft portion is formed on the rear side of two coil portions, and a second locking shaft portion is formed rearward from the distal end of the first locking shaft portion. The first locking shaft portion is engaged with the locking recess, and the second locking shaft portion is engaged with the fixing hole. The distance between the first locking shaft portions of the spring member is less that the distance between the two guiding edges.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: December 3, 2013
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Takahiro Maniwa, Mitsuo Yabutsuka
  • STEERING DEVICE
    Publication number: 20130263686
    Abstract: A steering device includes a housing constituted by an enclosing main body section, a separation section formed on two sides of on the lower side of the enclosing main body section along the axial direction thereof, and clamping sections formed respectively on two sides of the enclosing main body section so as to face each other in the lateral direction of the separation section; a fixed bracket having fixed side sections that clamp the housing at two sides in the lateral direction; a clamp that clamps the two clamping sections of the housing and the two fixed side sections of the fixed bracket; an outer pipe having at the axially front side thereof a slit formed in the axial direction; and an inner pipe inserted into the inner circumferential side of the outer pipe.
    Type: Application
    Filed: March 28, 2013
    Publication date: October 10, 2013
    Applicant: YAMADA MANUFACTURING CO., LTD
    Inventors: Toshihito Osawa, Toru Sekiguchi, Katsutoshi Tsuji
  • Steering device
    Patent number: 8550497
    Abstract: Provided is a steering device in which play of a bolt shaft and the like during telescopic adjustment can be prevented using a telescopic adjustment function enabling a driver to adjust a position of a steering wheel in a front-rear direction. The steering device includes a column pipe, an outer housing, a fixed bracket, a stopper bracket, a tightening member having a bolt shaft, a slide guide, an elastic stopper rubber material mounted on the slide guide, and an elastic pushing member in which torsional coil spring portions are formed at both axial ends of a pushing shaft portion. The bolt shaft is passed through a tightening hole of the outer housing and a support hole of the fixed bracket along shaft support portions of the slide guide, and the elastic pushing member is locked and fixed to the fixed bracket.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: October 8, 2013
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Naoyuki Takezawa, Yoshiyuki Sato, Toru Ito
  • ENGINE WITH VARIABLE FLOW RATE OIL PUMP
    Publication number: 20130255643
    Abstract: The engine with a variable flow rate oil pump includes a subsidiary relief passage that extends from an oil passage-switching valve to a subsidiary oil pump, a main relief passage that extends from the oil passage-switching valve to the main oil pump separately from the subsidiary relief passage, and a check valve that is provided in the subsidiary discharge passage and cuts off the flow of oil from the main discharge passage side to the oil passage-switching valve side. The oil passage-switching valve has a main pressure-adjusting chamber for the main oil pump, a subsidiary pressure-adjusting chamber of for the subsidiary oil pump, and a spool valve that performs partitioning between the main pressure-adjusting chamber and the subsidiary pressure-adjusting chamber.
    Type: Application
    Filed: March 18, 2013
    Publication date: October 3, 2013
    Applicants: HONDA MOTOR CO., LTD., YAMADA MANUFACTURING CO., LTD.
    Inventors: Yasunori ONO, Junichi MIYAJIMA, Noriyuki KAWAMATA, Hayato MAEHARA, Eisuke KAJIHARA, Kazuhiro TAKEUCHI, Norihiko GOGAMI, Satoshi INO
  • Steering apparatus
    Patent number: 8522639
    Abstract: The present invention provides a steering apparatus that can provide good operation feeling in telescopic adjustment and can have a very simple configuration. The steering apparatus has a fixed bracket, a movable bracket, a sliding shaft support member, and a tightening tool. The sliding shaft support member is constituted by a main sliding unit made of an inelastic resin and buffer portions made of a rubber or an elastic resin. The buffer portions are fixedly attached to both sides of the main sliding unit in the front-rear direction, the upper and lower surfaces of the main sliding unit are in a state of sliding contact with both guide edges of a long hole for telescopic adjustment of the movable bracket, and the buffer portions can abut only on both stop end edges and do not come into contact with the two guide edges.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: September 3, 2013
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Kouji Hirooka, Suguru Sugishita
  • Electric water pump
    Patent number: 8476795
    Abstract: In a circuit substrate of an electric water pump, a Hall IC can be mounted on a circuit substrate at an optimum position in a stable and durable state. The electric water pump includes a motor housing, a stator constituted by a stator core covered by a resin insulator and a coil, a circuit substrate, a holder 6 mounted on the circuit substrate, and a Hall IC mounted on the holder. A holder accommodation portion, into which the holder is inserted, is formed in the insulator, the stator is disposed in and fixed to the motor housing, the circuit substrate is appropriately mounted on the motor housing, and the holder 6 is inserted into and supported by the holder accommodation portion.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: July 2, 2013
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Keisuke Wakabayashi, Masanori Umeno, Nobuyuki Kabasawa
  • STEERING DEVICE
    Publication number: 20130160598
    Abstract: A steering device includes a fixed bracket, a movable bracket, a friction plate, a first friction washer, a pressing plate, engagement units, a second friction washer, and a fastening tool. The friction plate is attached to face, with an appropriate gap, at least one of both fixed side portions of the fixed bracket. The first washer is inserted between the fixed side portion and the friction plate. The pressing plate is attached to an outer surface of the friction plate. The engagement unit causes the pressing plate to be detachably attached and be immovable at least in a vertical direction. The second friction washer is clamped between the pressing plate and the friction plate. The fixed bracket, the friction plate, the first friction washer, the second friction washer, and the pressing plate are connected by penetrating therethrough a lock bolt of the fastening tool.
    Type: Application
    Filed: December 19, 2012
    Publication date: June 27, 2013
    Applicant: YAMADA MANUFACTURING CO., LTD.
    Inventor: YAMADA MANUFACTURING CO., LTD.