Electrical Patents (Class 188/1.11L)
  • Publication number: 20070158142
    Abstract: A device and method for monitoring the application of a motor vehicle automatic parking brake by measuring a physical property (either resistivity or electrical conductivity) of a friction lining (3) of a brake pad (2) throgh a measurement apparatus (5) electrically connected to the friction lining and comparing the values measured during and after the application of the automatic parking brake with values prerecorded in memory to identify the position of the parking brake.
    Type: Application
    Filed: December 13, 2004
    Publication date: July 12, 2007
    Inventor: Aleksander Hurwic
  • Patent number: 7232013
    Abstract: A brake system including a brake pad shaped and located to apply pressure to a brake rotor and an actuator shaped and located to apply pressure to the brake pad to cause the brake pad to apply pressure to the rotor. The system further includes a sensor material which varies in resistance when the actuator applies pressure to the brake pad, wherein the sensor material include an electrically insulating material with electrically conductive particles distributed therein. The system further includes a controller operatively coupled to the sensor material to detect a change in resistance of the sensor material.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: June 19, 2007
    Assignee: Delphi Technologies, Inc.
    Inventor: Christopher M. Thrush
  • Publication number: 20070131492
    Abstract: A brake lining wear sensor includes a first portion attached to a brake lining support plate, a second portion that engages a rotating brake component after brake lining material wears to a predetermined wear level, and an internal bore that extends through the first and said second portions. A sensor wire is received within the internal bore and includes a looped portion positioned within the second portion such that the looped portion is held at a predetermined brake lining wear level limit. When the looped portion is broken due to contact with a rotating brake component, a warning signal is communicated to an operator to indicate that a wear limit has been reached.
    Type: Application
    Filed: March 9, 2006
    Publication date: June 14, 2007
    Inventors: Thomas Cory, Bruce Harris, Joseph Kay, Dacio de Gonzaga Paul
  • Publication number: 20070131491
    Abstract: A brake lining wear sensor includes a thermoplastic body that is secured to a support plate between adjacent brake lining blocks. The support plate includes an opening formed within a gap between adjacent lining blocks. The thermoplastic body is received within the opening and includes a central bore that extends from a first body end to a second body end. A sensor wire is received within the bore and includes a single looped portion that extends outwardly from an end face of the second body end. The single looped portion is positioned at a predefined maximum lining wear limit. When the single looped portion is broken due to contact with a rotating brake component, a warning signal is communicated to an operator to indicate that the predefined maximum lining wear limit has been reached.
    Type: Application
    Filed: December 13, 2005
    Publication date: June 14, 2007
    Inventors: Thomas Cory, Bruce Harris, Joseph Kay, Dacio de Gonzaga Paul
  • Patent number: 7219772
    Abstract: The invention relates to a disk brake, particularly for commercial vehicles, comprising a brake caliper covering a brake disk, a tensing device arranged in a brake caliper for tensing the brake pads on both sides of the brake disk in the direction thereof, and at least one regulating system arranged in the brake caliper in order to equalize the brake pad and/or disk deterioration by adjusting the distance between the brake pad and the brake disk. The invention is characterized in that at least one or more adjusting rotational devices which are driven by an electric motor are provided on each side of the brake disk to adjust the axial distances between the brake pads and the brake disk. According to a method for controlling the regulating system of the brake disk, the regulating rotational device is individually controlled on both sides of the brake disk.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: May 22, 2007
    Assignee: Knorr-Bremse Systeme fuer Nutzfahrzeuge GmbH
    Inventors: Dieter Bieker, Johann Baumgartner, Wolfgang Pahle
  • Patent number: 7165657
    Abstract: A modular electrical resistance sensor is positionable in gaps between brake linings for a drum brake. The modular sensor is worn with the brake linings resulting in steadily increasing electrical resistance of the modular sensor. A measurement circuit associated with the modular sensor is programmed to equate electrical resistance to the degree of wear when the sensor has assumed a steady state temperature at or near the ambient temperature. Otherwise, particularly during periods of use of the brakes, resistance and the degree of wear last calculated become arguments into a function for determining brake lining temperature.
    Type: Grant
    Filed: October 11, 2004
    Date of Patent: January 23, 2007
    Assignee: International Truck Intellectual Property Company, LLC
    Inventor: James Palladino
  • Publication number: 20070007088
    Abstract: A system and method for monitoring the applications of carbon-carbon brakes of an aircraft to determine brake condition and operate a brake maintenance program or charge a brake system user. The system and method includes monitoring each actuation of the brakes and making a separate record of each actuation of the brakes in which there is relative movement of the facing friction surfaces that cause wear, and from that separate record determining brake usage. The monitoring may include measuring changes and processing the signals to distinguish between those which fall below and those which are above a threshold value. The method and system may comprise sensing a plurality of braking parameters having values dependent upon the wear in the system and different faults of the system, and identifying and recording wear and faults based on combinations of values of the parameters.
    Type: Application
    Filed: April 26, 2006
    Publication date: January 11, 2007
    Applicant: Dunlop Aerospace Limited
    Inventors: Richard Miller, Ross Marshall, David Bailey, Nicholas Griffin
  • Publication number: 20070001511
    Abstract: A disc brake, especially for utility vehicles, which includes a caliper enclosing a brake disc, a pneumatically or electromotively operated tensioning device for tensioning the brake, which is located in the caliper, a magnet wheel rotating with the brake disc, and a stationary sensor for detecting the angle of rotation and the speed of the magnet wheel. The sensor is mounted at a distance from the magnet wheel and at least one line is connected to transmit pulses between the sensor and the magnet wheel. As a result, the sensor can be mounted on the housing protected from the action of heat and other environmental influences and so as to be easily accessible.
    Type: Application
    Filed: April 24, 2006
    Publication date: January 4, 2007
    Applicant: Knorr-Bremse Systeme Fuer Nutzfahrzeuge GmbH
    Inventors: Johann Baumgartner, Guenther Gschossmann
  • Publication number: 20060219486
    Abstract: A method and a device for controlling an electrically actuated wear adjuster of a brake application device for vehicles, in particular rail vehicles. Said method comprises the following steps: a) determination of an actual application stroke of brake linings against an allocated brake disc or brake drum during service braking, in accordance with at least one measured brake application path that is traversed by the brake linings and with a measured braking force value that is allocated to said brake application path; b) comparison of the actual application stroke with a desired brake application stroke or a desired application stroke tolerance range and if the actual application stroke deviates from said stroke or range: calculation of an adjustment path from said deviation; c) electronic control of the wear adjuster in accordance with the calculated adjustment path.
    Type: Application
    Filed: March 31, 2003
    Publication date: October 5, 2006
    Inventors: Thomas Wagner, Thomas Burkhart, Ulf Friesen, Manfred Vohla, Josef Staltmeir
  • Publication number: 20060219487
    Abstract: A brake-shoe wear sensor has a sensor element capable of being worn away for generating different electrical outputs in accordance with wear and at least one electrical wire connected to and extending outwardly away from the sensor element so that a controller can be connected to the sensor element via the wire. A one-piece housing has an inner end molded unitarily around and encapsulating the sensor element and an outer end spaced therefrom and molded unitarily around and encapsulating an outer end portion of the wire.
    Type: Application
    Filed: February 28, 2006
    Publication date: October 5, 2006
    Inventors: Manuel Wille, Gunter Jager, Oliver Gachter
  • Patent number: 7108107
    Abstract: An electrically actuated aircraft brake system and method which provides for brake wear measurement, brake running clearance adjustment, ram position-based control and improved construction and operation. Brake wear and running clearance measurement are obtained by analyzing the output of position sensing circuitry. The position sensing circuitry, preferably including a LVDT position sensor, is also used to determine braking load, a brake controller including circuitry for effecting displacement of one or more reciprocating rams to load a brake disk stack by a predetermined amount based on a present displacement value of the position signal obtained from the position sensor. The position sensor preferably includes a LVDT transducer connected between the reciprocating ram and a brake housing, and the motive device preferably includes a servo motor.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: September 19, 2006
    Assignee: Goodrich Corporation
    Inventors: Mihai Ralea, Franklin C. Christ
  • Patent number: 7104364
    Abstract: An electrically driven vehicle brake comprises a brake piston, which acts on at least one friction lining and can be displaced out of an initial position into an actuation position, in which the brake piston abuts the friction lining against a rotating member of the vehicle brake which is to be connected, fixed against rotation, to a wheel of the motor vehicle, and a transmission unit, driven by an electric motor and acting on the brake piston to actuate the brake piston, wherein the electric motor is to be triggered by an electronic control unit, which is also set up to detect performance parameters of the vehicle, the electric motor and/or the vehicle brake.
    Type: Grant
    Filed: May 11, 2005
    Date of Patent: September 12, 2006
    Assignee: Lucas Automotive GmbH
    Inventors: Gregor Godlewsky, Thomas Maur, Michael Keller, Ralf Leiter, Ralf Kinder, Gregor Poertzgen
  • Publication number: 20060191751
    Abstract: A system and method for monitoring the usage of brake members of an aircraft braking system. The system makes a separate record of each brake actuation in which there is relative movement of the brake member's facing friction surfaces which causes wear, determines the types of brake usage and operates a pricing/payment scheme to charge for brake usage.
    Type: Application
    Filed: May 16, 2006
    Publication date: August 31, 2006
    Applicant: DUNLOP AEROSPACE LIMITED
    Inventors: Richard Miller, Ross Marshall, David Bailey, Nicholas Griffin
  • Patent number: 7086503
    Abstract: System and method for monitoring the applications of the brakes, e.g. of an aircraft to determine brake condition and operate a brake maintenance programme or charge a brake system user. It is desirable to have accurate information for determining the condition and predicting the life of carbon-carbon brake discs. This is important for safety as well as commercial reasons. The number of landings of an aircraft is often used as a determinant for such as lifetime warranties for brake discs and recommended maintenance periods. However, at least for carbon disc brakes, this may not be entirely accurate. For example such brake discs also wear during taxiing. The system and method herein includes monitoring each actuation of the brakes and making a separate record of each actuation of the brakes in which there is relative movement of the facing friction surfaces that cause wear, and from that separate record determining brake usage.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: August 8, 2006
    Assignee: Dunlop Aerospace Limited
    Inventors: Richard John Miller, Ross John Marshall, David Alexander Bailey, Nicholas Charles Griffin
  • Publication number: 20060090968
    Abstract: A brake assembly includes a sensor mounted to a brake component, and which is in communication with a transceiver. The sensor provides position information of the brake component, which is combined with known mechanical relationships between various brake components, to determine a wear state of a brake pad and a clearance between the brake pad and a rotor. The clearance is then adjusted based on signals from the sensor and the known mechanical relationship between the various brake components to maintain the clearance within desired limits.
    Type: Application
    Filed: November 1, 2004
    Publication date: May 4, 2006
    Inventors: Martin Taylor, Jeffrey Thomas, Royston Morris, Lester Clarke, Mark Norman
  • Patent number: 7011186
    Abstract: In a method for determining the state of a motor vehicle brake, particularly the brake-lining state or the brake-lining thickness, a temperature sensor is arranged in the brake lining of the motor vehicle brake, and the temperature detected by the sensor is used to determine the brake state. In addition to a first temperature value, at least one second temperature value detected after the first temperature value and the time duration between the detection time points of the two temperature values are employed. The brake state is determined based on an evaluation of a time profile of temperature values sensed by said sensor.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: March 14, 2006
    Assignee: DaimlerChrysler AG
    Inventors: Georg Frentz, Matthias Leber
  • Patent number: 7011185
    Abstract: A low cost brake sensor incorporates a sensor portion extending through one of the rivet holes in the backing plate of the brake pad. A locking sleeve snaps onto the sensor portion and secures the sensor to the backing plate. Preferably, the locking sleeve has a lip which snaps into a groove in an outer periphery of a sensor portion. The present invention thus provides a relatively low cost and secure way for attaching the sensor to the brake pad. No modification of the lining or the backing plate is necessary.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: March 14, 2006
    Assignee: Meritor Heavy Vehicle Technology, LLC
    Inventor: Dennis A. Kramer
  • Publication number: 20060042734
    Abstract: A wear component includes an acceptable wear portion, a marginal wear portion, and a sensor disposed below the acceptable wear portion and configured to generate a condition signal in response to an energizing signal.
    Type: Application
    Filed: August 24, 2004
    Publication date: March 2, 2006
    Inventors: Douglas Turner, Laurence Matola, Jeffrey Higgins
  • Publication number: 20050269873
    Abstract: The system and method for monitoring wear of one or more aircraft parts, such as an aircraft brake, an aircraft tire, a standby system, and landing gear. One or more sensors are provided for sensing a parameter of usage, and an estimate of usage of the part can be determined based upon the signal indicating the sensed value of the parameter of usage of the aircraft part. A plurality of sensors can be provided for sensing usage of a plurality of parts of the aircraft, and the estimate of usage of the part can be stored for access of the estimate by ground personnel. As applied to monitoring wear of an aircraft brake, a linear brake wear indicator attached to the brake moves a discrete distance when the brake is actuated, and a linear position encoder measures the distance travelled by the linear brake wear indicator as an indication of brake usage.
    Type: Application
    Filed: May 11, 2005
    Publication date: December 8, 2005
    Inventor: Garrett DeVlieg
  • Publication number: 20050252727
    Abstract: A brake assembly includes a caliper, a brake pad, an actuator to force the brake pad into engagement with a rotor and an adjuster mechanism to compensate for wear of the brake pad. The adjuster mechanism includes a rotating component that rotates substantially in proportion to wear of the brake pad and is manually operable to deadjust the adjuster mechanism when replacement of the brake pad is required. The rotating component is operably coupled to a pad wear indicator mounted on the caliper which visually indicates an amount of brake pad wear.
    Type: Application
    Filed: May 12, 2005
    Publication date: November 17, 2005
    Inventors: Tom England, Paul Thomas, Paul Roberts, Simon Fisher
  • Publication number: 20050212357
    Abstract: A vehicle brake having a brake monitoring and sensor system attached to a brake shoe of a brake assembly for monitoring of temperature and wear of a brake shoe lining of a vehicle. The vehicle brake monitoring and sensor system includes a brake assembly for frictional braking of a vehicle. The brake assembly includes a brake shoe lining having a brake shoe and a brake pad for frictional engagement with the brake assembly; and the brake shoe lining has first rivet openings with rivets therein, and has second rivet openings with no rivets therein. The vehicle brake monitoring system also includes a sensor system having a first sensing element and a second sensing element each connected to the brake shoe; the first sensing element is embedded in one or more of the first rivet openings with the rivets therein; and the second sensing element is embedded in one or more of the second rivet openings having no rivets therein.
    Type: Application
    Filed: March 23, 2004
    Publication date: September 29, 2005
    Inventor: Frank Adams
  • Publication number: 20050189182
    Abstract: The present invention concerns a digital sensor for monitoring the wear of lining material of a disc brake. The sensor is to be attached to the end of an adjusting shaft of an adjusting mechanism, which mechanism is used for adjusting the position of brake pads in relation to the brake disc. The sensor has two or more code parts of which one is rotated continuously by rotation of the adjustment shaft. The code parts have paths of codes to be read by detectors placed on a PCB. The PCB has circuitry to relate the position of the sensor to the wear of the lining material.
    Type: Application
    Filed: September 25, 2003
    Publication date: September 1, 2005
    Inventors: Lars Severinsson, Anders Persson, Luis Tormo
  • Publication number: 20050161290
    Abstract: Disk brake comprising an electrical wear sensor with an electrical connector (17?), a caliper (10) having an opening (8) and at least one pin (13) fixed to the caliper between two opposite sides of the opening and means for fixing the connector (17?) to the caliper (10). To avoid special processing operations of the caliper body and to provide an easy and rapid assembly of the connector, the fixing means comprise a carrier element (20) made of shaped sheet metal that has a first part (21, 26) to which the connector (17?) is fixed and a second part (23-25) that engages with the pin (13) and the edges of the opening (8) to provide a firm attachment of the carrier element (20) to the caliper (10).
    Type: Application
    Filed: March 21, 2002
    Publication date: July 28, 2005
    Applicant: Freni Brembo S.p.A.
    Inventors: Giuseppe Donadoni, Antonio Gotti
  • Publication number: 20050082122
    Abstract: A control system for a disc brake adjuster mechanism includes a controller and an electric adjuster motor for operable connection to an adjuster mechanism for driving a friction lining towards and away from a disc brake rotor to maintain a predetermined running clearance between the brake rotor and the friction lining when a brake is not applied. The system further includes a brake displacement sensor, and the controller is programmed to determine the brake displacement at which a predetermined load on the friction lining is achieved due to the contact with the disc brake rotor. The predetermined load is determined from a parameter of the electric adjuster motor or adjuster mechanism. The system is programmed to measure the brake displacement during brake release.
    Type: Application
    Filed: October 18, 2004
    Publication date: April 21, 2005
    Inventors: Martin Taylor, Mark Norman
  • Publication number: 20050029056
    Abstract: The invention relates to disc brake comprising an actuator, which has a brake actuating lever and is located in a brake caliper and to a method for determining the braking force in braking operations using a disc brake. The invention is characterized in that at least one tension sensor is positioned at least on the brake actuation lever, on the brake actuator, on the brake caliper and/or on a brake anchor plate, said sensor being used to measure the tensions for determining the brake force. A location on the brake actuating lever is particularly suitable.
    Type: Application
    Filed: September 27, 2002
    Publication date: February 10, 2005
    Inventors: Johann Baumgartner, Dirk Ganzhorn
  • Publication number: 20040251090
    Abstract: A brake actuator assembly includes a sensor mounted to a push rod which is in communication with a transceiver antenna. The sensor provides positional information of the push rod relative to the antenna. A clearance between a friction element and a rotating brake member is determined based on displacement of the push rod and known mechanical relationships within the brake actuator.
    Type: Application
    Filed: June 16, 2003
    Publication date: December 16, 2004
    Inventors: Royston Leonard Morris, Mark Anthony Norman, Martin Pors Taylor, Lester Clarke, Jeffrey Clive Thomas, Dennis A. Kramer, Robert E. Costello, Jeffrey Allen Schoenhals, Paul C. Guenther
  • Publication number: 20040206584
    Abstract: An apparatus is provided for displaying the state of wear of a brake lining on a vehicle. The brake lining wear display apparatus comprises a wear sensor for sensing the state of wear of the brake lining and a display for providing a visual signal indicating the brake lining wear state. An electronic control/evaluation system controls the display device. An electrical connecting device connects the wear sensor to the electronic control/evaluation system. The electronic control/evaluation system evaluates signals from the wear sensor and provides a signal to the display for generating the visual signal. A memory storage device stores a current wear state of the brake lining as well as previously sensed wear states. A power supply device provides power to the wear display device.
    Type: Application
    Filed: March 29, 2004
    Publication date: October 21, 2004
    Inventor: Peter Bihn
  • Publication number: 20040168864
    Abstract: A braking system (10; 50) comprises a braking member (12; 52) mounted so that an engagement surface (12c) of the braking member can engage a braked member (14) to apply a braking force thereto. The braking system also comprises a wear sensor (20; 60) operable to detect wear of the braking member in service. The wear sensor comprises a sensor head (22) mounted so that a wear surface (22c) of the sensor head is substantially flush with the engagement surface (12c) of the braking member (12) and engages the braked member (14) when said engagement surface does so that said engagement and wear surfaces are subject to substantially equal wear. The wear sensor also comprises detecting means (30) operable to detect wear of said sensor head (22).
    Type: Application
    Filed: December 18, 2003
    Publication date: September 2, 2004
    Inventors: Wilfried Strauss, Robert Allen Emmett
  • Patent number: 6725977
    Abstract: A probe (20) has a holder (21) with a small-diameter portion- (25) and a stepped surface (33) at a base end of the small diameter portion (25). The stepped surface (33) is recessed over the entire circumference of a base end of a small-diameter portion (25) to form a groove (40) and an inner corner of the groove (40) is rounded. The probe (20) is mounted by resiliently pressing the stepped surface (33) against the edge of a mount hole (15) in a base plate (13) of a brake shoe (12). A bending force acts on the small-diameter portion (25) of the holder (21) due to the sliding contact of the brake drum (10). However, the rounded portion (41) at the bottom of the groove (40) avoids a stress concentration on an inner corner of the base end of the small diameter portion (25).
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: April 27, 2004
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventor: Hitoshi Takanashi
  • Publication number: 20040069573
    Abstract: A capacitive sensor for sensing the thickness of an automobile brake pad is provided. The sensing capacitor includes a pair of parallel plates that are arranged such that brake pad wear reduces the size of one or both of the pads. The reduced size of the plate(s) is detectable as a change in capacitance between the plates. In on aspect a reference capacitor is also placed within the brake pad. The reference capacitor includes a pair of plates that do not change size during wear of the brake pad. The capacitance of the sensing capacitor can be compared to the capacitance of the reference capacitor for a more accurate indication of pad wear.
    Type: Application
    Filed: July 31, 2003
    Publication date: April 15, 2004
    Applicant: Rosemount Inc.
    Inventor: William T. Anderson
  • Patent number: 6719102
    Abstract: A wear detection probe for detection of wear of a braking member is mounted in or adjacent to the braking member. The wear detection probe includes a holder having a detection wire in a wiring path. The detection wire has a folded portion, and two portions extending from the folded portion in a direction substantially parallel to the surface of the brake rotor. An apex of the folded portion of the detection wire is nearer than the straight portions to the wear surface of the holder, so that after a predetermined amount of wear, the folded portion is broken without breaking the straight portions. The probe is compact, and the wire remains securely in position during use.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: April 13, 2004
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventor: Hitoshi Takanashi
  • Publication number: 20040065516
    Abstract: An electrically operated brake assembly includes a drum and brake shoes. A stepper motor drives the brake shoes into engagement with the drum. Upon engagement of the brake shoes with the drum, the stepper motor slips. Slipping of a stepper motor indicates that a home position has been reached. Upon release of the brake, the brake shoe is moved away from the drum a fixed distance. The fixed distance is an optimal distance between the friction member and the rotating member such that regardless of wear, the distance relationship between the brake shoe and drum is maintained.
    Type: Application
    Filed: October 2, 2002
    Publication date: April 8, 2004
    Inventor: Dennis Kramer
  • Patent number: 6688436
    Abstract: A brake pad assembly includes an elastic pad body having a braking face, a mounting face formed with a battery-receiving recess to receive a battery, and a light emitting member mounted on an exterior of the pad body and having first and second spring terminals extending therefrom into the recess in such a manner that the first spring terminal constantly contacts a positive electrode of the battery and that the second spring terminal is spaced apart from a negative electrode of the battery. A pushing member is formed in the pad body, and is elastically deformable so as to push the second spring terminal to abut against the negative electrode upon deformation of the pad body when the braking face is compressed.
    Type: Grant
    Filed: January 7, 2003
    Date of Patent: February 10, 2004
    Inventor: Kuo-Hsin Wang
  • Patent number: 6634465
    Abstract: The invention relates to a spring-loaded brake with a first housing part (2) connected to a first brake calliper arm (26) and a second housing part (14) connected to a second brake calliper arm (28) and with an actuation device (18), by means of which the first and second housing part (2, 14) are capable of being moved relative to one another. The air passage as well as the wear of this spring-loaded brake can be monitored reliably and in a simple manner by means of a measuring device (7, 10) which continuously monitors the change in the relative position of the housing parts (2, 14).
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: October 21, 2003
    Assignee: Tüschen & Zimmermann
    Inventor: Alfred Tüschen
  • Patent number: 6564909
    Abstract: A vehicle braking member has a block of friction material cooperating in sliding manner with a respective member for braking, and supports a wear detector wherein a resistive element, consumed simultaneously with the block of friction material, has a first electric terminal set, in use, to a reference potential, and a single second electric terminal cooperating in sliding manner with the member for braking so as to be set to the same potential as the member for braking.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: May 20, 2003
    Assignee: I.C.P. S.r.l.
    Inventor: Tancredi Razzano
  • Publication number: 20030085081
    Abstract: A probe (20) has a holder (21) with a small-diameter portion (25) and a stepped surface (33) at a base end of the small diameter portion (25). The stepped surface (33) is recessed over the entire circumference of a base end of a small-diameter portion (25) to form a groove (40) and an inner corner of the groove (40) is rounded. The probe (20) is mounted by resiliently pressing the stepped surface (33) against the edge of a mount hole (15) in a base plate (13) of a brake shoe (12). A bending force acts on the small-diameter portion (25) of the holder (21) due to the sliding contact of the brake drum (10). However, the rounded portion (41) at the bottom of the groove (40) avoids a stress concentration on an inner corner of the base end of the small diameter portion (25).
    Type: Application
    Filed: July 10, 2002
    Publication date: May 8, 2003
    Applicant: Sumitomo Wiring Systems, Ltd.
    Inventor: Hitoshi Takanashi
  • Patent number: 6494297
    Abstract: A low cost brake sensor incorporates a sensor portion extending through one of the rivet holes in the backing plate of the brake pad. A locking sleeve snaps onto the sensor portion and secures the sensor to the backing plate. Preferably, the locking sleeve has a lip which snaps into a groove in an outer periphery of a sensor portion. The present invention thus provides a relatively low cost and secure way for attaching the sensor to the brake pad. No modification of the lining or the backing plate is necessary.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: December 17, 2002
    Assignee: Meritor Heavy Vehicle Systems, LLC
    Inventor: Dennis A. Kramer
  • Patent number: 6481539
    Abstract: A system and method for monitoring brake pad wear are provided. The system provides a vehicle disc brake caliper assembly including a boot assembly and least one friction pad. The system further provides at least one caliper bolt including a caliper bolt switch point, the caliper bolt movably positioned within the boot assembly. A conductive element is positioned a predetermined distance from the caliper bolt switch point. An electrical circuit is switched when the conductive element contacts the switch point. The contact is established when the friction pad wears to a predetermined level corresponding to the predetermined distance. The method provides a caliper bolt including a caliper bolt switch point. A conductive element is positioned a predetermined distance from the caliper bolt switch point. The predetermined distance is progressively decreased as the brake pad wears. An electrical circuit is switched when the conductive element contacts the caliper bolt switch point.
    Type: Grant
    Filed: August 9, 2001
    Date of Patent: November 19, 2002
    Assignee: Delphi Technologies, Inc.
    Inventors: Schuyler S. Shaw, Bryan P. Riddiford, Huang-Tsang Chang
  • Publication number: 20020167402
    Abstract: A drum brake (10) comprising a drum (12); a first brake shoe (14) which is pivotally mounted at one end (30) thereof and having friction lining material (34) thereon; a second brake shoe (16) which is pivotally mounted at one end (32) thereof and having friction lining material (36) thereon; spring means (38) biasing the friction material of each brake shoe away from the drum; at least one actuator (18) engaging the other end of each brake shoe for moving the friction lining material of each brake shoe into contact with the drum on actuation thereof against the bias of the spring means; and a wear sensor (40) mounted on one of the brake shoes in a position circumferentially spaced from the friction lining material thereon, and having a free end (54) positioned adjacent the drum; wherein the free end of the wear sensor engages the drum to produce an audible signal solely when the or each actuator is actuated, and when the radial height of the friction lining material is at or below a predetermined minimum.
    Type: Application
    Filed: April 19, 2002
    Publication date: November 14, 2002
    Inventors: Guillaume Trenado, Georges Batut, Remy Perus
  • Patent number: 6471015
    Abstract: A lining wear measurement system which accepts signals from a plurality of movement/displacement sensors coupled to respective auto-adjusters of vehicle brakes and giving information about prevailing brake pad/lining thickness. The system includes a means to hold internally a target wear-out point representing a minimum acceptable brake lining thickness based upon the characteristics of known linings and an internally stored starting point which is set automatically at a suitable point in time after the brake has been equipped with a set of replacement linings so as thereby to take account of the reducing disc or drum thickness as the life of the brake progress. Alternatively, the system can hold an internally stored starting point which is arranged to be manually initiated but actually stored at some suitable point in time thereafter upon each set of replacement linings being installed.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: October 29, 2002
    Assignee: Goodrich Corporation
    Inventors: Mihai Ralea, Franklin C. Christ
  • Patent number: 6450300
    Abstract: A brake shoe assembly includes a backing plate and a brake lining. The brake lining has an interface surface abutting the backing plate and a wear surface for contacting a vehicle. A pair of temperature sensors are positioned adjacent to the interface surface and spaced unequal distances from the wear surface for determining the thickness of the brake lining. The pair of temperature sensors may be embedded directly in the brake lining or encapsulated in one of a plurality of housing embodiments packaged in the brake lining. In a preferred embodiment, a unique brake lining temperature sensor assembly is attached to the brake shoe assembly. The unique temperature sensor assembly includes a body of material having a proximate end positioned adjacent to the backing plate and a distal end for contacting the vehicle concurrently with the wear surface of the brake lining. A heat pipe, disposed within the body of material, extends from the distal end toward the proximate end.
    Type: Grant
    Filed: October 21, 1998
    Date of Patent: September 17, 2002
    Assignee: Meritor Heavy Vehicle Systems, LLC
    Inventor: Dennis A. Kramer
  • Patent number: 6446764
    Abstract: In a monitoring apparatus, a conductive coupling member is embedded in a brake pad of a brake system and is spaced apart from a first brake member by a thickness of the brake pad when wearing of the brake pad has yet to reach a predetermined worn-out state. A wear detecting circuit is coupled to the coupling member for detecting wear condition of the brake pad, and is capable of outputting a wear signal when the brake system is activated and the brake pad ceases to space apart the coupling member from the first brake member. A pressure detecting unit generates a pressure signal in accordance with pressure condition in a pneumatic tire. A processing unit receives the wear signal and the pressure signal, and enables an indicating unit to indicate the pressure condition in the pneumatic tire and the wear condition of the brake pad.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: September 10, 2002
    Inventor: Tien-Tsai Huang
  • Patent number: 6397977
    Abstract: A vehicle brake of the caliper type having electrically actuated active adjustment of the running clearance of a brake lining relative to a brake rotor, wherein, for brake operation, angular displacement of a rotatable component (14) of the brake by an external actuator causes axial displacement of a tappet arrangement (22, 24) within the brake whereby to transmit the actuator input load to the brake lining of the brake. The brake includes a switch for supplying a brake de-adjust signal when the brakes are to be opened for example for lining replacement. The switch is mounted on or in the body of the brake caliper and provides a non-contact switch arrangement actuated by a rotary movement provided by the rotatable component (14) of the brake in response to lining wear.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: June 4, 2002
    Assignee: Meritor Heavy Vehicle Systems, LLC
    Inventor: Andrew John Ward
  • Patent number: 6360850
    Abstract: A progressive brake lining wear and temperature sensor having a plurality of parallel arranged spaced apart resistors in connection with a sensing circuit. Each resistor is mounted onto a PC board which in turn is encapsulated within a single molding. A thermistor is also mounted onto the PC board within the molding to sense lining temperature. The thermistor is connected to a ground lead. The ground lead, resistance lead and thermistor lead emerge from the encapsulated sensor for connection to the sensing circuit. The sensor is disposed within the brake lining and is connected to the brake shoe by a securement clip. As the brake lining progressively wears, the resistors are progressively worn away thus changing the overall resistance of the sensor. The change in resistance indicates state of wear. Preferably, three resistors are employed to indicate four degrees of brake lining wear.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: March 26, 2002
    Assignee: Dana Corporation
    Inventors: William Warda Odisho, James Heydweiller
  • Patent number: 6352137
    Abstract: A vehicle brake monitor for a brake actuator having a housing and a rod reciprocal through an opening in the housing. The brake monitor includes a magnet and a sensor located within the magnetic field of the magnet and fixed relative to the housing, and a shunt which is reciprocal with the brake actuator rod between the magnet and the sensor which interrupts a signal between the sensor and the magnet when the shunt is located between the magnet and the sensor during reciprocal movement of the rod, signaling at least one position of the rod relative to the housing.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: March 5, 2002
    Assignee: Indian Head industries, Inc.
    Inventors: Wally V. Stegall, Alan C. Lesesky
  • Patent number: 6345699
    Abstract: A brake actuator having a switch device mounted to an actuator housing with a C-shaped molded body and a C-shaped spring member partially surrounding an actuator rod and adapted to contact a large diameter section of the actuator rod when brake wear causes the actuator rod to travel to a service limit position. In normal operation the spring member is separated from a small diameter section of the actuator rod. The switch device is mounted at an open end of the molded body and spring member and comprises first and second electrical contacts which extend and electrically contact each other as long as the brake actuator rod has not traveled to the service limit. When the push rod ahs traveled to its service limit, a large diameter portion of the push rod forces the contacts apart thus opening the electric circuit.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: February 12, 2002
    Assignee: Dana Corporation
    Inventor: Thomas Lee Runels
  • Patent number: 6345700
    Abstract: A brake lining module (10) with electric warning device (12) for indicating excessive friction lining wear comprises a back plate (14), to which a friction lining (16) is fastened, wherein the back plate (14) has a radially situated, friction-lining-free region (18). Disposed close to the back plate (14) in the friction lining (16) is a bore (24), in which a plug (28) is provided, which comprises a head (34) and a shank (32) with a longitudinal groove (38), in which an electric conductor (30) passed through the head (34) is accommodated. Projecting up from the head (34) of the plug (28) is a protective shield (36), which is laterally offset relative to the longitudinal groove (38) and has an extension (46), which at a distance above the head (34) protrudes in the direction of the common center plane (40) of the shank (32) and of the longitudinal groove (38).
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: February 12, 2002
    Assignee: Lucas Industries public limited company
    Inventor: Guido Zenzen
  • Patent number: 6341670
    Abstract: A brake wear managing system is disclosed herein. The brake wear managing system comprises a plurality of sensor assemblies, an on-board controller and, optionally, a remote controller. The sensor assembly includes a mounting assembly and a sensor to measure the wear of a brake assembly and to generate a signal accordingly. Each sensor is coupled to the on-board controller. The on-board controller is configured to generate brake wear condition signals in response to the signal generated by each sensor. The optional remote controller is directly connected to the on-board controller or coupled to it via a wireless communication signal. The remote controller is configured to be operated either in maintenance mode or in operational mode.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: January 29, 2002
    Assignee: Rideau Bulk Ltd.
    Inventors: Daniel Leblanc, Sébastien Hardy
  • Patent number: 6338397
    Abstract: A device according to the invention for the automatic fixing of bend B of a lining wear indicator, in particular for a motor vehicle brake, comprises a wire that is embedded in a plastic extrusion-coated component. A spacer and an insert are also embedded with the wire in the plastic extrusion-coated component. The procedure of the invention includes laying the wire along the spacer; positioning the spacer 3 with the wire into a hollow cylindrical portion of the insert; and bending the insert. Additionally, the bent insert can be placed in an injection mold; a plastic extrusion coating can be applied to at least part of the insert 4, and the coated, bent lining wear indicator can be removed from the mold.
    Type: Grant
    Filed: July 3, 2000
    Date of Patent: January 15, 2002
    Assignee: Leoni Automotive Leads GmbH & Co. KG
    Inventors: Tanil Gezgin, Horst Kontants, Herman Brauer, Manfred Knoetig
  • Patent number: H2026
    Abstract: A brake service signaling system for use on a vehicle responsive to the angular relationship between an actuator lever arm and an actuator rod having an attachment clevis where a switch electrically connected to a processing unit is mounted to the attachment clevis for contact and activation with the actuator lever when the brake requires service which is signaled to the operator by the processing unit.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: June 4, 2002
    Inventors: Jay D. White, James R. Clark, LaVerne A. Caron