Patents by Inventor Yoichi Kumemura
Yoichi Kumemura 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).
-
Patent number: 10591008Abstract: Provided are a disc brake and a piston whose weights can be effectively reduced. A disc brake includes a piston configured to press a pad against a disc. The piston includes a body member formed into a bottomed cylindrical shape and including a cylinder portion and a bottom portion. The cylinder portion and the bottom portion are approximately equal in wall thickness. The piston further includes a plate-shaped member fixed to an external bottom surface of the body member and disposed within a range of the external bottom surface and in a region including a center of the external bottom surface.Type: GrantFiled: June 21, 2016Date of Patent: March 17, 2020Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Kumi Hashimoto, Yoichi Kumemura, Keisuke Taniguchi
-
Patent number: 10183657Abstract: A master cylinder includes a piston seal installed in a circumferential groove. The piston seal includes an annular base section, an inner circumferential lip section protruding from an inner circumferential side of the base section to come in sliding contact with an outer circumferential surface of a piston, an outer circumferential lip section protruding from an outer circumferential side of the base section to abut the circumferential groove, and an intermediate protrusion section protruding from between the inner circumferential lip section and the outer circumferential lip section of the base section to a forward side of the outer circumferential lip section. A step difference section is formed at the outer circumferential side. The circumferential groove has a step section that always abuts an outer circumferential surface of the step difference section.Type: GrantFiled: January 29, 2014Date of Patent: January 22, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Sadatomo Matsumura, Yoichi Kumemura
-
Publication number: 20180245648Abstract: Provided are a disc brake and a piston whose weights can be effectively reduced. A disc brake includes a piston configured to press a pad against a disc. The piston includes a body member formed into a bottomed cylindrical shape and including a cylinder portion and a bottom portion. The cylinder portion and the bottom portion are approximately equal in wall thickness. The piston further includes a plate-shaped member fixed to an external bottom surface of the body member and disposed within a range of the external bottom surface and in a region including a center of the external bottom surface.Type: ApplicationFiled: June 21, 2016Publication date: August 30, 2018Inventors: Kumi HASHIMOTO, Yoichi KUMEMURA, Keisuke TANIGUCHI
-
Patent number: 9797464Abstract: An urging spring (15) urges a friction pad toward the exit side of the rotational direction of a disk when a vehicle equipped with the disk brake runs forward. The urging spring is disposed between a lug portion (11A) of the friction pad and a torque receiving surface (5) of a carrier (2). The distal end of the urging spring is configured to abut against the disk to perform wear detection. The urging spring includes a mounting portion (15A), a first extending portion (15B), a boundary region (15E), a bent portion (15C), and a second extending portion (15D). The boundary region is reduced in width to lower stiffness. The bent portion is increased in width and provided with reinforcing portions, thereby enhancing the stiffness. Thus, the natural frequencies of the second extending portion in the rotational direction K and the vertical direction J come close to each other.Type: GrantFiled: April 30, 2014Date of Patent: October 24, 2017Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Hayuru Inoue, Daisuke Tanabe, Yoichi Kumemura, Seiko Tanabe, Hitoshi Yoshida
-
Patent number: 9663085Abstract: A circumferential wall of a circumferential groove near a bottom section of a cylinder main body has an outer wall section extending from a bottom section of the circumferential groove in a radial direction of the cylinder main body, a stepped surface section extending from the outer wall section in a bottom direction of the cylinder main body, and an inner wall section having a flat surface section parallel to the radial direction of the cylinder main body and formed further inside in the radial direction of the cylinder main body than the stepped surface section. The inner wall section is formed at a position at which the center lip section first abuts the inner wall section prior to the outer wall section when the seal member moves toward the bottom section of the cylinder main body.Type: GrantFiled: March 27, 2013Date of Patent: May 30, 2017Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Seiko Tanabe, Yoichi Kumemura
-
Patent number: 9360068Abstract: A disc brake that suppresses braking noises when a vehicle moves backward include an urging spring urging a friction pad toward a rotationally exiting side of a disc when the vehicle moves forward, the urging spring being arranged between a hook portion of the friction pad and a torque receiving portion of a carrier. The urging spring formed through bend of an elastic plate material has its spring constant that is set to be a small value to avoid resonance frequency causing noise where the base end side thereof is fixed to the hook portion of the backing plate while the top end side thereof elastically abuts to the torque receiving portion of the carrier. The urging spring is located at the position that is outside in the radial direction from the center position of the hook portion in its width direction.Type: GrantFiled: June 29, 2010Date of Patent: June 7, 2016Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shoichi Noguchi, Daisuke Tanabe, Takeshi Fujiki, Koichi Masuko, Shigeru Hayashi, Koji Fukui, Yoichi Kumemura, Hayuru Inoue, Seiko Tsubota
-
Publication number: 20160116011Abstract: An urging spring (15) urges a friction pad toward the exit side of the rotational direction of a disk when a vehicle equipped with the disk brake runs forward. The urging spring is disposed between a lug portion (11A) of the friction pad and a torque receiving surface (5) of a carrier (2). The distal end of the urging spring is configured to abut against the disk to perform wear detection. The urging spring includes a mounting portion (15A), a first extending portion (15B), a boundary region (15E), a bent portion (15C), and a second extending portion (15D). The boundary region is reduced in width to lower stiffness. The bent portion is increased in width and provided with reinforcing portions, thereby enhancing the stiffness. Thus, the natural frequencies of the second extending portion in the rotational direction K and the vertical direction J come close to each other.Type: ApplicationFiled: April 30, 2014Publication date: April 28, 2016Inventors: Hayuru INOUE, Daisuke TANABE, Yoichi KUMEMURA, Seiko TANABE, Hitoshi YOSHIDA
-
Publication number: 20150360660Abstract: A master cylinder includes a piston seal (45) installed in a circumferential groove (32). The piston seal (45) includes an annular base section (101), an inner circumferential lip section (102) protruding from an inner circumferential side of the base section (101) to come in sliding contact with an outer circumferential surface (18a) of a piston (18), an outer circumferential lip section (103) protruding from an outer circumferential side of the base section (101) to abut the circumferential groove (32), and an intermediate protrusion section (104) protruding from between the inner circumferential lip section (102) and the outer circumferential lip section (103) of the base section (101) to a forward side of the outer circumferential lip section (103). A step difference section (107) that is long in the axial direction at the inner circumferential side is formed at the outer circumferential side of the base section (101).Type: ApplicationFiled: January 29, 2014Publication date: December 17, 2015Inventors: Sadatomo MATSUMURA, Yoichi KUMEMURA
-
Patent number: 9027716Abstract: A pressing part is provided at a disk-circumferentially central portion of a base plate member of a shim plate. The pressing part presses a friction pad at the center in the disk circumferential direction of the friction pad when a piston starts to press the friction pad. The pressing part is formed by slitting and raising the disk-circumferentially central portion of the shim plate along the disk radial direction. When the pressing force of the piston is in a low pressure range, the pressing force is transmitted to the friction pad through the pressing part. After the pressing force of the piston has exceeded the low pressure range, the pressing force is transmitted to the friction pad through the whole region in the disk circumferential direction of the piston.Type: GrantFiled: June 29, 2012Date of Patent: May 12, 2015Assignee: Hitachi Automotive Systems, Ltd.Inventors: Seiko Tanabe, Yoichi Kumemura, Hayuru Inoue, Hitoshi Yoshida
-
Publication number: 20150047338Abstract: A circumferential wall of a circumferential groove near a bottom section of a cylinder main body has an outer wall section extending from a bottom section of the circumferential groove in a radial direction of the cylinder main body, a stepped surface section extending from the outer wall section in a bottom direction of the cylinder main body, and an inner wall section having a flat surface section parallel to the radial direction of the cylinder main body and formed further inside in the radial direction of the cylinder main body than the stepped surface section. The inner wall section is formed at a position at which the center lip section first abuts the inner wall section prior to the outer wall section when the seal member moves toward the bottom section of the cylinder main body.Type: ApplicationFiled: March 27, 2013Publication date: February 19, 2015Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Seiko Tanabe, Yoichi Kumemura
-
Patent number: 8348283Abstract: A suspension control apparatus selectively performs at least one of: compression-stroke control performed when a wheel load is increased, for setting a damping-force characteristic of at least one of damping-force variable dampers, which is provided on a side of at least one wheel whose wheel load is to be increased among a plurality of wheels, to a hard side in an early stage of a compression stroke and switching the damping-force characteristic to a soft side in a latter stage of the compression stroke; extension-stroke control performed when the wheel load is increased, for setting the damping-force characteristic to the soft side in an early stage of an extension stroke and switching the damping-force characteristic to the hard side in a latter stage of the extension stroke; compression-stroke control performed when the wheel load is reduced, for setting the damping-force characteristic of at least one of the damping-force variable dampers, which is provided on a side of at least one wheel whose wheel loaType: GrantFiled: March 25, 2011Date of Patent: January 8, 2013Assignee: Hitachi Automotive Systems, Ltd.Inventors: Naofumi Harada, Yoichi Kumemura, Tatsuya Gankai
-
Publication number: 20130001025Abstract: A pressing part is provided at a disk-circumferentially central portion of a base plate member of a shim plate. The pressing part presses a friction pad at the center in the disk circumferential direction of the friction pad when a piston starts to press the friction pad. The pressing part is formed by slitting and raising the disk-circumferentially central portion of the shim plate along the disk radial direction. When the pressing force of the piston is in a low pressure range, the pressing force is transmitted to the friction pad through the pressing part. After the pressing force of the piston has exceeded the low pressure range, the pressing force is transmitted to the friction pad through the whole region in the disk circumferential direction of the piston.Type: ApplicationFiled: June 29, 2012Publication date: January 3, 2013Inventors: Seiko TANABE, Yoichi KUMEMURA, Hayuru INOUE, Hitoshi YOSHIDA
-
Patent number: 8103451Abstract: A collision between a vehicle and an obstacle is estimated, and based on the estimation result, vehicle deceleration control is performed by a brake actuator to reduce the collision and vehicle wheel load is controlled by a suspension actuator.Type: GrantFiled: January 19, 2007Date of Patent: January 24, 2012Assignee: Hitachi, Ltd.Inventors: Taisetsu Tanimichi, Tatsuya Yoshida, Mikio Ueyama, Shinya Ohtsuji, Isa Ismet Khumaedi, Takahide Kobayashi, Koji Fukui, Nobuyuki Ichimaru, Yoichi Kumemura, Shuichiro Kuroiwa, Masaaki Uchiyama, Tatsuya Gankai, Ryusuke Hirao
-
Publication number: 20110241299Abstract: A suspension control apparatus selectively performs at least one of: compression-stroke control performed when a wheel load is increased, for setting a damping-force characteristic of at least one of damping-force variable dampers, which is provided on a side of at least one wheel whose wheel load is to be increased among a plurality of wheels, to a hard side in an early stage of a compression stroke and switching the damping-force characteristic to a soft side in a latter stage of the compression stroke; extension-stroke control performed when the wheel load is increased, for setting the damping-force characteristic to the soft side in an early stage of an extension stroke and switching the damping-force characteristic to the hard side in a latter stage of the extension stroke; compression-stroke control performed when the wheel load is reduced, for setting the damping-force characteristic of at least one of the damping-force variable dampers, which is provided on a side of at least one wheel whose wheel loaType: ApplicationFiled: March 25, 2011Publication date: October 6, 2011Inventors: Naofumi HARADA, Yoichi KUMEMURA, Tatsuya GANKAI
-
Publication number: 20100326777Abstract: A disc brake that suppresses braking noises when a vehicle moves backward include an urging spring urging a friction pad toward a rotationally exiting side of a disc when the vehicle moves forward, the urging spring being arranged between a hook portion of the friction pad and a torque receiving portion of a carrier. The urging spring formed through bend of an elastic plate material has its spring constant that is set to be a small value to avoid resonance frequency causing noise where the base end side thereof is fixed to the hook portion of the backing plate while the top end side thereof elastically abuts to the torque receiving portion of the carrier. The urging spring is located at the position that is outside in the radial direction from the center position of the hook portion in its width direction.Type: ApplicationFiled: June 29, 2010Publication date: December 30, 2010Applicant: Hitachi Automotive Systems, Ltd.Inventors: Shoichi Noguchi, Daisuke Tanabe, Takeshi Fujiki, Koichi Masuko, Shigeru Hayashi, Koji Fukui, Yoichi Kumemura, Hayuru Inoue, Seiko Tsubota
-
Publication number: 20100078269Abstract: There is provided a disk brake, comprising: a pad supporting member where at least a pair of lining pads is supported, and at least two first installation holes are provided at a mounting portion that is installed to a vehicle; at least two second installation holes provided at a non-rotational portion of the vehicle; and a fixing bolt installed into the first and second installation holes so as to fasten the mounting portion and the non-rotational portion, wherein a reinforcement member is provided with at least two internal thread portions into which the fixing bolt is screwed, the reinforcement member being formed with materials different from the ones of the mounting portion and the non-rotational portion, and the mounting portion and the non-rotational portion are fastened by means of the reinforcement member and the fixing bolt.Type: ApplicationFiled: September 9, 2009Publication date: April 1, 2010Applicant: Hitachi Automotive Systems, Ltd.Inventors: Takahiro Tokunaga, Shinji Suzuki, Yoichi Kumemura
-
Publication number: 20070192030Abstract: A collision between a vehicle and an obstacle is estimated, and based on the estimation result, vehicle deceleration control is performed by a brake actuator to reduce the collision and vehicle wheel load is controlled by a suspension actuator.Type: ApplicationFiled: January 19, 2007Publication date: August 16, 2007Applicant: Hitachi, Ltd.Inventors: Taisetsu Tanimichi, Tatsuya Yoshida, Mikio Ueyama, Shinya Ohtsuji, Isa Ismet Khumaedi, Takahide Kobayashi, Koji Fukui, Nobuyuki Ichimaru, Yoichi Kumemura, Shuichiro Kuroiwa, Masaaki Uchiyama, Tatsuya Gankai, Ryusuke Hirao