WO2010059423A1 - Plongeur de réglage du frein automatique à autoréglage présentant une durée de vie accrue - Google Patents

Plongeur de réglage du frein automatique à autoréglage présentant une durée de vie accrue Download PDF

Info

Publication number
WO2010059423A1
WO2010059423A1 PCT/US2009/063248 US2009063248W WO2010059423A1 WO 2010059423 A1 WO2010059423 A1 WO 2010059423A1 US 2009063248 W US2009063248 W US 2009063248W WO 2010059423 A1 WO2010059423 A1 WO 2010059423A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
housing
cam shaft
slack adjuster
worm wheel
Prior art date
Application number
PCT/US2009/063248
Other languages
English (en)
Inventor
John Louis
Zoltan Tormasi
Original Assignee
Bendix Spicer Foundation Brake Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bendix Spicer Foundation Brake Llc filed Critical Bendix Spicer Foundation Brake Llc
Priority to MX2011005105A priority Critical patent/MX2011005105A/es
Priority to CA2743835A priority patent/CA2743835C/fr
Priority to CN200980154781.7A priority patent/CN102282384B/zh
Priority to AU2009317920A priority patent/AU2009317920B2/en
Priority to EP09827998A priority patent/EP2359020A4/fr
Priority to BRPI0921164-0A priority patent/BRPI0921164B1/pt
Priority to RU2011124931/11A priority patent/RU2521454C2/ru
Publication of WO2010059423A1 publication Critical patent/WO2010059423A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/08—Brake-action initiating means for personal initiation hand actuated
    • B60T7/10—Disposition of hand control
    • B60T7/108—Disposition of hand control with mechanisms to take up slack in the linkage to the brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/04—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting mechanically
    • B60T11/06—Equalising arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/38—Slack adjusters
    • F16D65/40—Slack adjusters mechanical
    • F16D65/42—Slack adjusters mechanical non-automatic
    • F16D65/50—Slack adjusters mechanical non-automatic for angular adjustment of two concentric parts of the brake control system

Definitions

  • the present invention relates to brakes used on, for example, commercial truck or trailer axles, and in particular to automatic slack adjusters which eliminate excess motion in a brake actuator mechanism used to apply the brake.
  • Such adjusters typically are: (i) located on a portion of a brake cam shaft which is outside of the brake (typically splined to the cam shaft); and (ii) coupled to a pushrod of a brake actuator such that when the brake actuator push rod is extended or retracted, the slack adjuster rotates about the longitudinal axis of the brake cam shaft.
  • the slack adjuster causes the brake cam shaft to rotate about its longitudinal axis, which in turn rotates a brake actuation cam affixed to the end of the brake cam shaft located within the drum brake.
  • the rotation of the cam either presses the brake linings into engagement with the brake drum inner friction surface or allows the brake linings to withdraw radially inward, away from the friction surface.
  • Automatic slack adjusters are typically designed to transmit brake actuator force to the brake cam shaft in the brake application direction with no relative motion between the adjuster and the brake cam shaft.
  • the slack adjuster is permitted to rotate relative to the brake cam shaft an angular distance sufficient to remove some or all of this undesired slack, i.e., limiting the distance the brake linings withdraw from the brake drum friction surface so that the lining -drum clearance is maintained at a desired minimum.
  • a one-way clutch is used to accomplish the rotary adjusting movement, with a worm shaft located in the adjuster turning a worm gear (also known as a worm wheel; collectively, a "gear set” or “gear train”).
  • the worm gear is coupled, typically via splines, to the brake cam shaft.
  • the brake actuator pushrod When the brake actuator pushrod is retracted, the worm shaft rotates about its longitudinal axis, causing the worm shaft and worm gear to move relative to one another in a circumferential direction about the circumference of the worm gear. This relative movement of the worm shaft and gear creates corresponding relative motion between the slack adjuster body and the brake cam shaft.
  • the one-way adjustment mechanisms including, respectively, control worms 29, 15, and unlabeled worm engaging worm teeth 6) are located in their housings (respectively, 13, 1 and unlabeled cross-sectioned body) on the side of brake cam shaft (respectively, 4, 3, 3) which is in the brake actuation direction (illustrated by brake actuation direction arrows).
  • the one-way clutch mechanisms have been located on the brake actuation direction side of the automatic slack adjuster housings for a number of reasons, including that this location avoids the relatively space -constrained region behind the automatic slack adjuster. Due to the location of various components such as brake actuator support brackets in this region, placing the adjustment mechanism on the brake actuation direction side of the slack adjuster allows the designer greater freedom to package the one-way adjustment device within the slack adjuster housing.
  • the close quarters with other components in the vicinity of the automatic slack adjuster also has provided an incentive to locate the adjustment mechanism on the brake actuation direction side of the slack adjuster in order to ease access to the adjuster for in situ manual operation of the adjustment mechanism by a technician.
  • a significant problem with prior art automatic slack adjusters is that during brake application the reaction force transmitted via the worm gear and worm shaft is focused in the same area of the housing where the adjustment mechanism is located.
  • the forces of the brake application and the reaction forces generated by the worm gear set combine to apply very high stresses to the thin-section wall of the housing adjacent to the bore containing the gear drive of the one-way clutch adjustment mechanism and the bore through which the brake cam shaft passes (for example, in prior art Fig. 2, the thin wall section directly behind the intersection of the teeth of gears 12, 15).
  • the high stresses in this thin wall region greatly reduces the durability of the prior art automatic slack adjusters.
  • the present invention provides a solution to the problems of the prior art by moving the thin-section wall to a region behind the brake cam shaft and worm gear, i.e., to the side of the automatic slack adjuster housing which is way from the brake actuation direction.
  • this arrangement of the one-way adjustment mechanism components results in an automatic slack adjuster design which surprising leads to far lower stress levels in the thin -wall regions of the automatic slack adjuster that experienced in the thin-section wall regions of prior art automatic slack adjusters.
  • thin-wall region associated with the adjustment mechanism is now located outside of the load path through which the majority of the brake application and reaction forces pass from the brake actuator pushrod to the brake cam shaft. Because the thin-wall region of the housing is free of the majority of the brake application stresses, this region is subjected to lower local stress levels. Surprisingly, the reduction of stress levels in the thin-walled region can be dramatic. For example, initial finite element stress calculations have indicated that thin-wall region stresses in the present invention's automatic slack adjuster arrangement may be less that one -third of the high stress levels in prior art automatic slack adjuster housing designs. The magnitude of the stress level decrease is far in excess of the incremental reductions previously observed in prior attempts to improve prior art slack adjusters, such as by the above-noted increase in the thickness of the thin -wall portion of the adjuster housing.
  • the greatly reduced localized stress level provided by the present invention provide corresponding greatly increased levels of durability.
  • a portion of the increased load-bearing capacity of the present invention slack adjuster could be utilized by the designer to provide an automatic slack adjuster with a load capacity which is significantly higher that previously available in conventional automatic slack adjusters, without a corresponding increase in the automatic slack adjuster's size.
  • Another alternative available to the designer would be use of the additional strength and durability margin to design a smaller and/or lighter slack adjuster, saving weight, cost and installation space while still providing sufficient durability for heavy-duty service, as in commercial vehicle brake service.
  • FIGs. 1-3 are cross-section views of prior art slack adjuster worm gear and one-way adjustment clutch arrangements.
  • FIG. 4 is cross-section view of an automatic slack adjuster in accordance with an embodiment of the present invention.
  • FIG. 5 is a view of a bare housing of an automatic slack adjuster in accordance with an embodiment of the present invention.
  • FIG. 6 is cross-section view of an automatic slack adjuster in accordance with an alternative embodiment of the present invention. DETAILED DESCRIPTION OF THE DRAWINGS
  • FIG. 4 is cross-section view of an automatic slack adjuster 100, having a main gear set comprising a worm shaft 110 meshing with a worm gear 120, a brake actuator pushrod receiving hole 130 for coupling the automatic slack adjuster 100 to a brake actuator pushrod (not illustrated), and a splined coupling 140 either integrally formed with or otherwise coupled to the worm gear 120 to receive an end of a brake cam shaft 150.
  • the brake actuator pushrod pushes on the automatic slack adjuster in the brake application direction 160
  • the brake application force is transferred primarily through worm shaft seat 170 to worm shaft 110, and in turn through worm gear 120 to splined coupling 140 to rotate brake cam shaft 150 to apply the brake.
  • the one-way adjustment mechanism 180 is located on an end of the worm shaft which is facing away from the brake application direction 160, i.e., on the side of the automatic slack adjuster housing opposite brake application side 190.
  • a worm wheel of the adjustment mechanism 180 is driven by control gear 185, which is located on the end of a transverse control worm shaft (not illustrated) which meshes with the adjustment mechanism worm wheel.
  • the control gear 185 meshes with a fixed gear 187 on fixed reference arm 188.
  • a thin-wall section 195 is formed between the brake camshaft aperture and the transverse housing bore required to accommodate the transverse control worm on which control gear 185 rotates.
  • the thin -wall portion 195 of the automatic slack adjuster (shown for clarity in the Fig. 5 bare housing illustration without the gears of the adjustment mechanism) is not highly stressed. These lower local stress levels greatly improve the overall durability of the automatic slack adjuster. This is a significant improvement over prior art automatic slack adjusters, in which thin walls adjacent to brake application-side adjustment mechanisms were known to be highly-stressed weak areas.
  • the lower stress levels realized by the present invention further provide the opportunity to provide an automatic slack adjuster which has a greatly enhanced load-bearing capacity as compared to prior art automatic slack adjusters, while maintaining essentially the same space envelope, an important factor in the space -constrained environment in and around an axle end on a vehicle.
  • Fig. 6 One alternative embodiment of the present invention is illustrated in Fig. 6.
  • the brake application load is transferred from the brake actuator pushrod (not illustrated) coupled to the adjuster 100 via connection 130 through the adjuster body to work shaft seat 170, and thence through worm shaft 110 and worm gear 120 to brake cam shaft 150.
  • the actuation arm 200 of the automatic slack adjuster is moved from a position in which the worm shaft 110 is between the arm 200 and the brake cam shaft 150 to a position in which the worm shaft 110 is not between the arm 200 and the brake cam shaft 150.
  • the thin -wall section adjacent to the drive 185 of the adjuster mechanism 180 remains substantially away from the principal load path between the brake actuator pushrod and the brake cam shaft, and therefore the thin-wall section adjacent to the gear drive 185 also experiences only relatively low stress levels.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)
  • Gear Transmission (AREA)

Abstract

L'invention porte sur un plongeur de réglage du frein automatique à autoajustement amélioré, pour réduire le jeu d'un frein d'un véhicule, dans lequel un ensemble embrayage unidirectionnel est disposé dans le boîtier du plongeur de réglage du frein automatique de telle sorte qu'une région à paroi mince du boîtier associé à la transmission par engrenages de l'ensemble embrayage unidirectionnel est située à l'extérieur d'un trajet de charge par le biais duquel des forces d'application de freinage sont transmises d'un actionneur de frein à un arbre à came de frein sur lequel le plongeur de réglage du frein automatique est situé. Le nouveau positionnement de la transmission d'ensemble embrayage unidirectionnel conduit à des niveaux de contrainte plus faibles inattendus dans le plongeur de réglage du frein automatique, ce qui permet d’obtenir un plongeur de réglage du frein dont la durée de vie est accrue, et permet des augmentations étonnamment importantes de la capacité nominale du plongeur de réglage du frein.
PCT/US2009/063248 2008-11-18 2009-11-04 Plongeur de réglage du frein automatique à autoréglage présentant une durée de vie accrue WO2010059423A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
MX2011005105A MX2011005105A (es) 2008-11-18 2009-11-04 Tensor automático auto-ajustable con durbilidad mejorada.
CA2743835A CA2743835C (fr) 2008-11-18 2009-11-04 Plongeur de reglage du frein automatique a autoreglage presentant une duree de vie accrue
CN200980154781.7A CN102282384B (zh) 2008-11-18 2009-11-04 具有增强耐用性的自设定自动间隙调整器
AU2009317920A AU2009317920B2 (en) 2008-11-18 2009-11-04 Self-setting automatic slack adjuster with increased durability
EP09827998A EP2359020A4 (fr) 2008-11-18 2009-11-04 Plongeur de réglage du frein automatique à autoréglage présentant une durée de vie accrue
BRPI0921164-0A BRPI0921164B1 (pt) 2008-11-18 2009-11-04 ajustador de folga automático, freio de veículo e veículo
RU2011124931/11A RU2521454C2 (ru) 2008-11-18 2009-11-04 Самоустанавливающийся автоматический механизм регулировки зазора с увеличенным сроком службы

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/273,235 US8302742B2 (en) 2008-11-18 2008-11-18 Self-setting automatic slack adjuster with increased durability
US12/273,235 2008-11-18

Publications (1)

Publication Number Publication Date
WO2010059423A1 true WO2010059423A1 (fr) 2010-05-27

Family

ID=42171115

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/063248 WO2010059423A1 (fr) 2008-11-18 2009-11-04 Plongeur de réglage du frein automatique à autoréglage présentant une durée de vie accrue

Country Status (9)

Country Link
US (1) US8302742B2 (fr)
EP (1) EP2359020A4 (fr)
CN (1) CN102282384B (fr)
AU (1) AU2009317920B2 (fr)
BR (1) BRPI0921164B1 (fr)
CA (1) CA2743835C (fr)
MX (1) MX2011005105A (fr)
RU (1) RU2521454C2 (fr)
WO (1) WO2010059423A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10927902B2 (en) 2016-05-04 2021-02-23 Kongsberg Automotive As Pneumatic clutch actuator

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9360069B2 (en) 2014-07-16 2016-06-07 Bendix Spicer Foundation Brake Llc High resolution one-way clutch using graduated engagement in a radial arrangement
US10197123B2 (en) * 2016-08-04 2019-02-05 Tse Brakes, Inc. Vehicle braking systems with automatic slack adjusters
WO2018220639A1 (fr) * 2017-05-31 2018-12-06 Madras Engineering Industries Private Limited Dispositif de rattrapage de jeu automatique
USD860890S1 (en) * 2017-06-10 2019-09-24 Wabco India Limited Slack adjuster
USD860891S1 (en) * 2017-06-10 2019-09-24 Wabco India Limited Slack adjuster
FR3069666B1 (fr) * 2017-07-27 2021-11-05 Bernard Controls Systeme de came comportant au moins un module mobile de commande d'un dispositif actionnaire
US10378604B2 (en) * 2017-12-07 2019-08-13 Bendix Spicer Foundation Brake Llc Slack adjuster for a drum brake of a vehicle air braking system
US10704630B2 (en) * 2018-05-14 2020-07-07 Bendix Spicer Foundation Brake Llc Automatic slack adjuster with adjusting clutch in control train
CN108679126B (zh) * 2018-07-20 2020-04-14 韩笛 一种汽车制动间隙手自动调整臂
US10808779B2 (en) 2018-08-01 2020-10-20 Bendix Commerical Vehicle Systems Llc Anti reverse ratchet mechanism for a grounded slack
US11209062B2 (en) * 2019-05-15 2021-12-28 Bendix Commercial Vehicle Systems Llc Automatic slack adjuster
CN110345181B (zh) * 2019-07-19 2024-02-27 绍兴铁安汽配制造有限公司 一种轻量型制动间隙自动调整臂及制动系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921765A (en) * 1974-02-19 1975-11-25 Aeroquip Corp Automatic brake slack adjuster
US4440268A (en) * 1979-12-13 1984-04-03 Sab Automotive Ab Brake lever for an S-cam automotive drum brake
US5327999A (en) * 1992-11-18 1994-07-12 Haldex Ab Brake lever for an S-cam automotive drum brake
US7198138B2 (en) * 2004-06-14 2007-04-03 Ang Automotive India Private Limited Automatic slack adjuster assembly for vehicle braking system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997036A (en) * 1975-09-09 1976-12-14 Borg-Warner Corporation Automatic brake slack adjuster
US4380276A (en) * 1980-07-21 1983-04-19 Kelsey-Hayes Co. Slack adjuster for vehicle brakes
SE438718B (sv) 1980-11-26 1985-04-29 Svensson Sten Eric Regulator for automatisk efterstellning av fordonsbromsar
SE502201C2 (sv) * 1993-11-26 1995-09-18 Haldex Ab Bromshävarm för en s-kamtrumbroms hos ett landsvägsfordon
RU2078001C1 (ru) * 1994-09-05 1997-04-27 Андрей Андреевич Боталенко Регулятор тормоза транспортного средства
CN2305521Y (zh) * 1995-12-23 1999-01-27 韩学智 气动刹车间隙自动调整臂
RU2291332C2 (ru) * 2001-11-29 2007-01-10 Общество С Дополнительной Ответственностью "Дискомс" Регулятор тормоза транспортного средства
WO2003083322A1 (fr) 2002-04-01 2003-10-09 Madras Engineering Industries Limited Dispositif de reglage automatique des freins pour le rattrapage de jeu entre la garniture de frein et le tambour de frein dans un systeme de freinage de vehicule automobile
CN2551522Y (zh) * 2002-04-24 2003-05-21 韩学智 汽车制动间隙自动调整臂
CN100455840C (zh) * 2004-04-07 2009-01-28 马德拉斯机器制造私人有限公司 用于调整车辆制动系统的制动衬片和制动鼓之间间隙的制动间隙自动调整器
CN201100352Y (zh) * 2007-11-01 2008-08-13 万安集团诸暨汽车零部件有限公司 一种汽车制动间隙自动调整臂总成

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921765A (en) * 1974-02-19 1975-11-25 Aeroquip Corp Automatic brake slack adjuster
US4440268A (en) * 1979-12-13 1984-04-03 Sab Automotive Ab Brake lever for an S-cam automotive drum brake
US5327999A (en) * 1992-11-18 1994-07-12 Haldex Ab Brake lever for an S-cam automotive drum brake
US7198138B2 (en) * 2004-06-14 2007-04-03 Ang Automotive India Private Limited Automatic slack adjuster assembly for vehicle braking system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2359020A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10927902B2 (en) 2016-05-04 2021-02-23 Kongsberg Automotive As Pneumatic clutch actuator

Also Published As

Publication number Publication date
CA2743835C (fr) 2017-09-05
US8302742B2 (en) 2012-11-06
CN102282384B (zh) 2015-03-11
BRPI0921164B1 (pt) 2021-04-20
AU2009317920A1 (en) 2010-05-27
AU2009317920B2 (en) 2014-10-23
US20100122878A1 (en) 2010-05-20
MX2011005105A (es) 2011-08-04
EP2359020A4 (fr) 2013-02-13
BRPI0921164A2 (pt) 2016-02-23
RU2521454C2 (ru) 2014-06-27
EP2359020A1 (fr) 2011-08-24
RU2011124931A (ru) 2012-12-27
CN102282384A (zh) 2011-12-14
CA2743835A1 (fr) 2010-05-27

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