Patents Assigned to Akebono
-
Patent number: 4973108Abstract: An anti-lock control device of a hydraulic brake system which enables a rapid building up of braking hydraulic pressure during normal braking but, once an anti-lock control is commenced, reduces the rise of the recovery of the braking hydraulic pressure so as to optimize the same for anti-lock control. The hydraulic braking system having a pneumatic pressure source, a brake valve, converting device for receiving the pneumatic pressure supplied from the pneumatic pressure source through the brake valve and converting the received pneumatic pressure into braking hydraulic pressure, wheel cylinders for receiving the braking hydraulic pressure, and pneumatic pressure control valves for controlling the pneumatic pressure in a pneumatic pressure chamber of the converting means so as to control the braking hydraulic pressure.Type: GrantFiled: July 6, 1989Date of Patent: November 27, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventors: Takao Maki, Tomohiro Fujita
-
Patent number: 4967866Abstract: In a traction control system for motor vehicles, the design is made such that during traction control operation, detection is made as to whether both the left-hand and the right-hand driving wheel speed have become equal to or higher than a predetermined threshold value, and detection is also made as to whether one of the driving wheel speeds which is increasing and the other one of the driving wheel speeds which is decreasing, have crossed each other; when the results of such detections are both "YES", this is regarded as an indication that a hunting phenomenon is likely to occur, and in response thereto, buildup and reduction of the brake hydraulic pressure is restricted; during the restriction, detection is made as to whether both of the driving wheel speeds have become equal to or lower than the predetermined threshold value, the above-mentioned restriction is removed.Type: GrantFiled: April 21, 1989Date of Patent: November 6, 1990Assignees: Akebono Brake Industry Co., Ltd., Akebono Research and Development Centre Ltd.Inventor: Toshifumi Maehara
-
Patent number: 4964490Abstract: The pin type disc brake in which a guide pin is inserted from a boss hole of a second extension arm of a caliper to a boss hole of a first extension arm thereof, the guide pin has a threaded end to which a nut is screwed, a member for preventing the guide pin from moving along the axis of the disc is fitted in a recessed portion formed on the first extension arm of the caliper, and a member for preventing the guide pin from rotating is abutted against a flat surface of an abutment portion formed on the first extension arm of the caliper.Type: GrantFiled: May 9, 1989Date of Patent: October 23, 1990Assignees: Akebono Brake Industry Co., Ltd., Akebona Research and Development Centre Ltd.Inventor: Namio Watanabe
-
Patent number: 4962824Abstract: In a traction control system for motor vehicles, a plurality of threshold values which are higher than the vehicle speed (equal to the non-driving wheel speed) are set up; the wheel speed as increasing or decreasing is compared with the above-mentioned plurality of threshold values to effect buildup or reduction of the brake fluid pressure; and holding of the brake fluid pressure is effected on the basis of a variation in the acceleration/deceleration of the driving wheel; in the case where the holding control mode in which the brake fluid pressure is held, persists for a predetermined time period or longer when the driving wheel speed is higher than a specific one of the above-mentioned plurality of threshold values, the holding control mode is switched to buildup control mode.Type: GrantFiled: May 22, 1989Date of Patent: October 16, 1990Assignees: Akebono Brake Industry Co., Ltd., Akebono Research and Development Centre Ltd.Inventors: Naoyuki Hagiya, Toshifumi Maehara
-
Patent number: 4962971Abstract: In an anti-skid control system for a motor vehicle equipped with an X-type two-channel anti-skid control brake apparatus, there are provided a valve which is located in a piping connecting a modulator for increasing and reducing the brake fluid pressure in a respective one of the two channels and arranged to be closed when rear wheel tends to be locked earlier than the front wheel; and a check valve which is disposed in parallel relationship to the first-mentioned valve and arranged to only permit the brake pressure fluid to flow from the rear wheel cylinder to the modulator in the respective one of the two channels.Type: GrantFiled: November 18, 1988Date of Patent: October 16, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventor: Katsuya Miyake
-
Patent number: 4952003Abstract: There is disclosed an apparatus for controlling brake fluid pressure of a vehicle. A supply valve of the normally closed type is opened only at the time of an anti-lock control so as to supply fluid pressure from an accumulator to a pressure fluid chamber of a master cylinder. An intake valve normally shuts off the communication between the accumulator and the fluid pressure chamber. A valve operating member for movement with a main piston of the master cylinder is engageable with a distal end of the intake valve projecting into the fluid pressure chamber to open the intake valve when the stroke of the main piston reaches a predetermined value, thereby communicating the fluid pressure chamber with the accumulator. An auxiliary piston is slidably mounted around the main piston so as to urge the main piston to move at the time of the traction control. A fluid pressure within an auxiliary fluid pressure chamber provided around the auxiliary piston acts on the auxiliary piston.Type: GrantFiled: July 19, 1989Date of Patent: August 28, 1990Assignees: Akebono Brake Industry Co., Ltd., Akebono Research and Development Centre Ltd.Inventor: Satomi Okubo
-
Patent number: 4951771Abstract: A system in which the throttle wire of an automobile engine to be operated by the accelerator pedal is arranged to as well be used for controlling a traction is disclosed.Since the present invention is structured in such a manner that an accelerator pulley and a traction pulley are provided such that they can rotate, the accelerator pulley is arranged to be able to rotate in a first direction in which the throttle is opened by the accelerator wire connected to the accelerator pedal, while the traction pulley is arranged to be able to rotate in a second direction which is opposite to the first direction by an actuator with a traction cable, and the throttle connected to the throttle wire is returned by the rotation of the traction pulley in the second direction, the throttle can be returned to the closing direction as to reduce the engine output when detection of an acceleration slip is arisen at the start or during running of the automobile.Type: GrantFiled: June 26, 1989Date of Patent: August 28, 1990Assignees: Akebono Brake Industry Co., Ltd., Akebono Research and Development Centre Ltd.Inventor: Toshifumi Maehara
-
Patent number: 4941712Abstract: A brake fluid pressure control apparatus comprises a fluid pressure control valve provided in a supply passage communicating a master cylinder with wheel cylinders, a stepped piston slidably fitted into the fluid pressure control valve and urged by a return spring in one direction toward a stop piston, a fluid pressure chamber provided in the central portion of the fluid pressure control valve in such a manner as to communicate with the supply passage, and a back pressure chamber provided in the other side of the stepped postion. The pressure fluid returned to the back pressure chamber at the time of a decrease of the pressure during anti-lock control is received by the stepped piston and is returned through a throttle portion to the master cylinder side, thereby relieving any kickback acting upon the brake pedal.Type: GrantFiled: December 14, 1988Date of Patent: July 17, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventor: Yoshiaki Hirobe
-
Patent number: 4933854Abstract: An anti-lock control system for motor vehicles is provided which is arranged so that at the first cycle of anti-lock control operation, respective brake channels are controlled at the same time and in the same manner instead of independently while at the second and subsequent cycles of the anti-lock control operation, the respective brake channels are controlled independently.Type: GrantFiled: October 14, 1988Date of Patent: June 12, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventor: Katsuya Miyake
-
Patent number: 4930260Abstract: In a centerless grinding apparatus, a first and a second guide plates are disposed on the side of a grinding wheel, as well as a third and a fourth guide plates are disposed on the side of a regulating feed wheel in parallel relation to the first and second guide plates. The grinding wheel is set to protrude from a guide surface of each of the first and second guide plates by a grinding width, and the regulating feed wheel is set to protrude from a guide surface of each of the third and fourth guide plates by a feed width. The guide surface of each of the third amd fourth guide plates is curved into a curvature equal to a curvature of the outer periphery of the regulating feed wheel.Type: GrantFiled: November 10, 1988Date of Patent: June 5, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventors: Susumu Itoh, Kazuo Satoh, Tomonori Sakuma
-
Patent number: 4929035Abstract: In an anti-lock control system for motor vehicle, the design is made such that the braking distance of the motor vehicle is prevented from being increased by excessive reduction of brake hydraulic pressure for a road surface of medium- or high friction coefficient, while at the same time the occurrence of vibration in the motor vehicle caused by excessive reduction of the brake hydraulic pressure is avoided.Type: GrantFiled: February 7, 1989Date of Patent: May 29, 1990Assignee: Akebono Brake Industry Co. Ltd.Inventor: Haruki Shimanuki
-
Patent number: 4926979Abstract: A disc brake of a guide pin type which comprises a boss member provided on one of a caliper of the disc brake and a support member fixed to a stationary portion of a vehicle, a guide pin slidably mounted in the boss member, the guide pin being fixed to the other one of the caliper and the support member, and a boot for damping and sealing the boss member. The boot is disposed between the boss member and the guide pin, the boot is formed of an elastic material, the boot is provided at one end thereof with a thickened portion and a seal portion. The thickened portion has an outer diameter substantially equal to an inner diameter of one end of the boss member, and the thickened portion being press-fitted in between the boss member and the guide pin.Type: GrantFiled: June 9, 1989Date of Patent: May 22, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventor: Seiya Odaka
-
Patent number: 4924566Abstract: Disclosed is a method for making a reinforcing element for use in asbestos-free friction materials. According to the method, heterogenous strands are joined together, without twisting them, and subjected to a fluid jet and to a rubber compounding material. At least one of the strands is fed to the multiplying stage at an overfeed rate.Type: GrantFiled: July 7, 1989Date of Patent: May 15, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventors: Hideo Shiraishi, Tsutomu Morita
-
Patent number: 4922961Abstract: An electromagnetic valve used in a hydraulic-pressure brake device, etc. is disclosed. The electromagnetic valve is so designed that the movement of its plungers is not hindered by the working liquid. Cylindrical members are arranged between the casing of the electromagnetic valve and its plungers, defining a bypass passage between the respective outer peripheral surfaces of the cylindrical members and the inner peripheral surface of the casing. With this structure, most of the liquid flowing with the opening/closing movement of valve members operatively connected to the plungers is allowed to flow through the bypass passage, thus making it possible to provide an electromagnetic valve having a high control responsiveness, without enlarging the size of the plungers.Type: GrantFiled: August 9, 1989Date of Patent: May 8, 1990Assignees: Akebono Brake Industry Co., Ltd., Akebono Research and Development Centre, Ltd.Inventor: Toshifumi Maehara
-
Patent number: 4919237Abstract: An automatic adjuster releasing apparatus characterized by the provision of a support member fixedly mounted on the wheel cylinder body; pin member slidably supported by the support member and having one end portion extending from an opening formed on the backing plate, the other end of the pin member facing an inner surface of the adjuster lever so as to be engageable therewith, so that when the other end of the pin member is pressed against the inner surface of the adjuster lever, the pin member releases the engagement of the other end of the adjuster lever with the adjuster gear; a resilient member urging the one end portion of the pin member to be projected from the opening on the backing plate; and a flexible cover fitted in the opening and covering the one end portion of the pin member.Type: GrantFiled: April 7, 1989Date of Patent: April 24, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventor: Kimihiro Yamazaki
-
Patent number: 4917220Abstract: An automatic gap control apparatus for a disc brake with a parking brake comprises a cup-shaped piston having a bottom, the piston is slidably mounted inside the brake operating cylinder, a rod having a through hole slidably fitted inside the body, which is prevented from rotating and provided with a one-way reversible thread, a sleeve nut having a concave portion at an end thereof, which is provided at a front end thereof an abutting portion abutting against the bottom of the piston and threadably engaged with the one-way reversible thread of the rod thereby forming a length adjusting mechanism, a small piston having a large diameter head, which is fitted in the through hole of the rod, and the large diameter head is fitted in the concave portion of the sleeve nut, and a spring member provided between the cup-shaped piston and the sleeve nut, which urges the sleeve nut.Type: GrantFiled: June 7, 1988Date of Patent: April 17, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventor: Hiroshi Ikegami
-
Patent number: 4915198Abstract: A disc brake has a disc rotor, a pair of confronting friction pad assemblies arranged on both sides of the disc rotor, a pad assembly support member fixed to an automotive vehicle body, and a caliper driving piston for moving one of the friction pad assemblies relative to the other in an axial direction of the disc rotor. The pad assemblies are each provided with a pair of lower two engaging steps for transmitting the brake torques to the support member, and also with upper corner shoulders for transmitting the brake torques. The support member is provided with step portions corresponding to the engaging steps and the upper corner shoulders of the brake assemblies. Thus, it is possible to reduce or suppress a deformation of the brake assemblies when the disc rotor rotates upon the brake application.Type: GrantFiled: September 3, 1987Date of Patent: April 10, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventor: Hiroshi Hirashita
-
Patent number: 4909359Abstract: A brake device for braking a shaft including a number of rotors rotatable with the shaft and at least one stator interposed among the rotors. The frictional force generated between the rotors and the stator is fed back to a rotatable pressure plate to assist in braking the shaft. In a first embodiment, a projection of the pressure plate engages one of a number of toothed portions that are provided on one of the stator elements to transmit force from the stator elements back to the pressure plate. In a second embodiment, a linkage element for turning the pressure plate also engages one of the toothed portions on the stators, thus transmitting force from the stator back to the pressure plate to assist in braking.Type: GrantFiled: March 27, 1989Date of Patent: March 20, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventors: Hideyuki Fujinami, Takashi Inoue
-
Patent number: 4894555Abstract: The brake control system for use in a vehicle includes a compression cylinder device and a decompression cylinder device, which communicate with a fluid passage between a gate valve and a wheel cylinder. A compression piston is reciprocately disposed inside of the compression cylinder device and a decompression piston is reciprocately disposed inside of the decompression cylinder device. A close valve of a normally close type is provided between the fluid passage and the decompression cylinder device. The system further includes a valve system provided between an accumulator and the compression and decompression cylinder devices. The valve system is provided for selectively supplying the hydraulic pressure in the accumulator to the compression and the decompression cylinder devices during skid-preventing and acceleration slip-preventing controls.Type: GrantFiled: November 19, 1987Date of Patent: January 16, 1990Assignee: Akebono Brake Industry Co., Ltd.Inventors: Namio Watanabe, Kinji Ogino, Satomi Ookubo
-
Patent number: 4892468Abstract: A hydraulic pump is disclosed, characterized in that, in the hydraulic pump including a cylinder body having a cylinder chamber, a suction port and an ejection port, a cam member and a reciprocatingly movable member are provided, wherein oil in said cylinder chamber is ejected when said movable member is pushed into said cylinder chamber by the cam member, a cylindrical piston is slidably fitted into said cylinder chamber, so that the movable member is engaged with the cylindrical piston when it is pushed into the cylinder chamber so shut off communication between the cylinder chamber and the suction port and a valve provided in the ejection passage communicating to said ejection port is opened due to the pressure rise when said movable member is further pushed into said cylinder chamber to eject the oil in the cylinder chamber outwardly.Type: GrantFiled: August 8, 1988Date of Patent: January 9, 1990Assignees: Akebono Brake Industry Co., Ltd., Akebono Research, Development Centre Ltd.Inventor: Toshifumi Maehara