EP0845072A1 - Outil de degagement d'actionneur de frein a ressort - Google Patents

Outil de degagement d'actionneur de frein a ressort

Info

Publication number
EP0845072A1
EP0845072A1 EP96928146A EP96928146A EP0845072A1 EP 0845072 A1 EP0845072 A1 EP 0845072A1 EP 96928146 A EP96928146 A EP 96928146A EP 96928146 A EP96928146 A EP 96928146A EP 0845072 A1 EP0845072 A1 EP 0845072A1
Authority
EP
European Patent Office
Prior art keywords
spring
housing
brake actuator
release
bolt
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP96928146A
Other languages
German (de)
English (en)
Other versions
EP0845072A4 (fr
Inventor
Ronald S. Plantan
Emmett S. Davis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Indian Head Inc
Indian Head Industries Inc
Original Assignee
Indian Head Inc
Indian Head Industries Inc
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
Priority claimed from US08/515,239 external-priority patent/US5636562A/en
Priority claimed from US08/574,611 external-priority patent/US5632192A/en
Priority claimed from US08/581,120 external-priority patent/US5623863A/en
Application filed by Indian Head Inc, Indian Head Industries Inc filed Critical Indian Head Inc
Publication of EP0845072A1 publication Critical patent/EP0845072A1/fr
Publication of EP0845072A4 publication Critical patent/EP0845072A4/fr
Withdrawn legal-status Critical Current

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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/08—Brake cylinders other than ultimate actuators
    • B60T17/085—Spring loaded brake actuators
    • B60T17/086—Spring loaded brake actuators with emergency release device
    • 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
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D2066/003—Position, angle or speed

Definitions

  • This Application relates to an improved release tool for a spring brake actuator that cages the power spring of the brake actuator with little or no axial movement outwardly of the actuator housing.
  • Spring brake actuators are utilized on modern heavy vehicles to actuate a brake when the vehicle is parked, or when a portion of the vehicle brake system
  • release tools have typically been provided in the parking side of a spring brake actuator.
  • the release tools have typically been a bolt that is received within a piston that holds the power spring. When the bolt is turned it pulls the power spring piston toward an outer end of the housing, holding or “caging” the spring. The bolt has typically moved axially outwardly of the housing as it is turned.
  • the release bolt typically extends axially outwardly from an outer end of the brake actuator housing when the power spring is fully caged. While this type of release bolt has proven successful, in many applications, there may not be sufficient axial room for the release bolt to extend axially from the brake actuator.
  • a spring brake actuator is provided with a release tool that extends little or not at all axially outwardly beyond its initial position as it cages the power spring.
  • a release bolt has a head accessible from outside the brake actuator housing. The bolt engages an internal threaded nut. Turning the head of the bolt moves the nut axially. The nut engages and moves a spring piston. The spring piston is thus pulled axially toward an outer end of the brake housing, caging the power spring. The bolt head does not move axially away from the brake actuator head during this movement, and thus additional axial space outwardly of the brake actuator is not necessary.
  • the nut is initially maintained by a spring at a location such that it is aligned with an initial thread on the bolt.
  • the nut is immediately engaged by the thread and begins to be withdrawn toward the outer end of the housing.
  • the nut since the nut is initially not actually engaged with the thread, should an operator begin to turn the bolt in the wrong direction, the nut will not be driven away from the outer end of the brake actuator. In this way, the present invention insures that there is not movement of the nut in a direction that would impede the normal operation of the brake actuator.
  • the nut has an outer periphery that matches the profile of an inner bore in the piston. The nut may slide within this inner bore during normal operation of the brake.
  • a spring biases the nut towards the bolt. Before the nut contacts the spring piston, this spring will bias the nut and bolt slightly axially outwardly. The bolt extends a small distance away from the outer portion of the brake actuator housing. An observer seeing this bolt head spaced slightly axially outwardly from the housing will know that the brake actuator is uncaged.
  • the nut when the operator begins to turn the bolt, the nut eventually contacts a flange on the spring piston, begins to cage the power spring and takes up the clearance. Initially after this contact, the spring force which is biasing the nut outwardly is first overcome, such that the bolt head does move inwardly from the power spring is completely caged before the outward position discussed above.
  • a snap ring on the bolt abuts the inner side of the housing when the bolt is moved outwardly by the spring to its outer position. This snap ring defines a stop limiting outward movement of the bolt.
  • an O-ring is positioned on an outer peripheral surface of the bolt at a position such that it provides a seal with the outer housing, and during movement of the bolt as described above.
  • This O-ring in conjunction with the spring at an inner end of the bolt provides a centering force to stabilize the bolt and dampen the effect of vibrations on the bolt.
  • the bolt may be utilized without the small spring. In this embodiment, the bolt does not pop up when uncaged, and the nut is received on threads at all times. Other operational aspects of this embodiment are similar to those discussed above.
  • the invention includes a hollow push rod that receives a portion of the length of the bolt and the nut.
  • the length of the release bolt does not increase the overall length of the brake actuator. Rather a portion of the length of the release bolt may extend axially inwardly beyond the power spring and into the push rod to reduce the required outer envelope size for the brake actuator.
  • the invention may be utilized on either piston or diaphragm brakes.
  • a bolt is received within a threaded nut.
  • the nut is received within a portion of a spring piston such that when the bolt is turned the nut engages the spring piston and draws it toward an outer end of the brake housing head.
  • the method includes the steps of turning the release bolt head, thereby turning the nut until the nut engages the spring piston.
  • the method further envisions continued turning of the head such that the nut begins to move the spring piston until the spring is fully caged.
  • a pop-up indicator is included into the release bolt that extends outwardly of the brake if the power spring has not been fully released.
  • the pop-up indicator is preferably formed of a bright color such that it may be easily visible. A worker seeing the pop-up indicator would know that the brake has not been fully released.
  • the release bolt itself has two threaded portions, with the threads extending in opposing directions.
  • An inner threaded portion is received in the nut as described above.
  • An outer threaded portion which is formed integrally with the inner threaded portion, is threadably received in an outer nut.
  • the outer threaded portion moves in the outer nut and the bolt extends outwardly of the brake, pulling the inner portion, and the nut, outwardly.
  • the inner threaded portion will be turning in its release nut, which then moves upwardly.
  • the release nut is being moved relative to the push rod and power spring by both threaded portions.
  • Figure 1 is a partially cross-sectional view of a spring brake actuator incorporating the present invention.
  • Figure 2 is a cross-sectional view along line 2-2 as shown in Figure 1.
  • Figure 3 is a cross-sectional view of the spring brake actuator moving towards the actuated position.
  • Figure 4 shows the spring brake actuator of Figure 1 with the spring caged.
  • Figure 5 shows a second embodiment release bolt.
  • Figure 6A shows a third embodiment brake actuator.
  • Figure 6B shows the embodiment of Figure 6A having moved to a different operational position.
  • Figure 6C shows the embodiment of Figure 6A having moved to yet another operational position.
  • Figure 7 shows another embodiment brake in a first condition.
  • Figure 8 shows the Figure 7 embodiment in a subsequent position.
  • Figure 9 shows yet another subsequent position.
  • Figure 10 shows yet another subsequent position.
  • Figure 11 shows yet another embodiment of the release tool of this invention.
  • Figure 12 shows the Figure 11 embodiment in an extended position.
  • Figure 13 shows the Figure 11 embodiment in its caged position.
  • Figure 1 shows a spring brake actuator 20.
  • the structure of the spring brake actuator other than that relating to the release tool mechanism is as known in the art. Thus, a detailed description of all components of the brake actuator will not be included.
  • a spring brake actuator includes a central housing body 22, typically referred to as a flange case that connects an outer brake housing member 24, sometimes known as a head to an inner brake housing 26, sometimes known as a service chamber. Within the head is a power spring 28.
  • Spring 28 selectively engages a brake through the yoke 27 upon certain conditions, as known.
  • a chamber 30 is defined beneath a diaphragm 32.
  • diaphragm 32 moves upwardly compressing the spring 28.
  • a push rod 34 associated with the diaphragm 32 is also moved upwardly.
  • the spring 28 is not actuated, and the push rod 34 is not forced downwardly.
  • the parking side of the brake actuator thus does not move the yoke 27 to actuate the brake.
  • spring 28 expands, forcing the push rod 34 downwardly to move the yoke 27 outwardly.
  • the spring 28 is received on a spring piston 36.
  • a release bolt 38 extends through the brake housing 24.
  • An O-ring seal 39 provides an air-tight seal between bolt 38 and the housing portion 24.
  • a threaded bolt portion 40 extends from the bolt head 41.
  • a nut 42 is received on the bolt 38 at an inner end of the housing 24. The nut 42 is received within a bore 44 in the piston 36.
  • Spring 46 biases the nut 42 to a position such that the threads within the nut 42 are aligned with the beginning thread 48 of the threaded portion 40. The portion 49 below thread 48 is not threaded.
  • the small spring 46 has biased the bolt head 41 to a position such that there is a slight clearance 70 between the bolt head 41 and the housing 44.
  • a snap ring 64 prevents further outward movement of the bolt 38.
  • the spring 46 biases the nut 42 and hence the bolt 38 outwardly to this position. An observer of the clearance 70 will know that the power spring 28 remains uncaged in a brake actuator 20.
  • the bore portion 44 has an inner periphery that corresponds to the outer periphery of the nut 42.
  • the nut and bore are both shown as being hexagonal, although other cross sections may well come within the scope of this invention.
  • a lower unthreaded portion 49 of the bolt 38 is received within a bore 52 of the nut 42. Bore 52 is threaded.
  • tool 60 may begin to turn the head 41 of the bolt 38.
  • the nut 42 Upon initially tuming the bolt 38, the nut 42 will be engaged on the threads of the threaded portion 40. Continued tuming of the head 41 will cause the nut 42 to move axially upwardly along the threaded portion 40. Eventually, the nut 42 contacts a flange 62 at an outer end of the piston 36.
  • Figure 5 shows another embodiment actuator 80.
  • the spring piston 82 includes a bore 84 as in the previous embodiment.
  • a nut 86 rides along a bolt 88. Upon tuming of the bolt 88, the nut 86 moves axially within the bore 84 as in the above embodiment.
  • Flange 92 extends inwardly from the piston 82. As the bolt 88 is turned, the nut 86 moves and eventually contacts the flange 92. Continued tuming of the bolt head 88 cages the spring as in the previous
  • the brake actuators shown in Figures 1-5 utilize diaphragms as their actuating member in the spring chamber.
  • the embodiment 80 shown in Figure 6A-6B disclose a piston type brake actuator. Other features of a embodiment
  • a piston brake 80 incorporates a housing member 82 that is connected to a central housing 84, as with a clip 86 or other known connection.
  • a power spring 88 biases a piston 90 outwardly.
  • Piston 90 moves with a push rod 92 to actuate a yoke as in the previous embodiments.
  • Push rod 92 is formed with a bore 94, and a bolt 96 extends downwardly into bore 94.
  • brake actuator 80 may be of a relatively smaller axial outer envelope size than if the push rod 92 were
  • the power spring 88 has now expanded to drive the piston 90 against the center housing 84.
  • the push rod 92 extends through the opening 100, and the yoke is actuated as is known.
  • the nut 98 is slightly spaced from the flange 102 in this position. The clearance 97 remains in this position, and the dimensions are preferably selected such that the piston 90 bottoms out on the housing 84 before the flange 102 contacts the nut 98 and overcomes the small force of the spring 99.
  • an observer will also be able to tell that the power spring 88 remains uncaged in this position.
  • a brake actuator in a method of caging a brake actuator according to the present invention, one initially provides a brake actuator with a threaded release tool that may be turned to cage a power spring without moving the tool axially away from the housing member.
  • the method includes the steps of providing such a release tool which threadably engages a nut, with the nut moving axially when turned by the release bolt to cage the power spring.
  • the method further includes the steps of beginning to turn the release bolt to move the nut and cage the power spring.
  • a push rod 112 receives a nut 114 as in above-described embodiment.
  • a spring piston 116 provides a stop for the nut 114 as in the above embodiment.
  • a cap 118 is received on a pop-up indicator rod 120.
  • a spring 124 reacts off of the release bolt 123 at a ledge portion 122.
  • Spring 124 forces a head 126 of the indicator 120 outwardly of the brake housing.
  • the head 126 is preferably formed of a bright color. An observer seeing the bright head will know that the brake is not fully released. As an example, in Figure 7, the brake is shown fully caged. Thus, the head 126 can move relative to the bolt 123 and the ledge 122.
  • the release nut 114 has been moved downwardly, but has not yet fully released the spring.
  • the spring is not able to extend to its full stroke. It would be desirable to provide an indication that the operator has not yet fully released the brake.
  • the spring 124 continues to bias head 126 outwardly of the brake.
  • the release nut 114 has been moved further and has now fully released the brake.
  • the release nut 114 has now abutted cap 118, and pulled cap 118 inwardly. This in turn pulls the rod 120 and head 126 against the force of the spring 124.
  • the head 126 is no longer extending outwardly of the cap.
  • the brake has been fully released.
  • the spring may extend to its full stroke. Again, the head 126 does not extend outwardly of the brake in this condition.
  • Figure 11 shows another embodiment 140 having a release bolt 142.
  • Release bolt 142 turns an inner release nut 144, which moves within a push rod 146 in a manner such as described with the above embodiments.
  • Release bolt 142 also has an outer nut 148.
  • Release bolt 142 has two integral threaded portions 150 and 152. The threads on portions 150 and 152 extend in opposed directions. The threads on portion 150 turn within outer nut 148 and the threads on portion 152 turn within inner nut 144.
  • the push rod 146 can extend under the influence of a power spring 154 to its full extent. Again, the bolt 142 does not extend outwardly of the housing, and an observer will be able to see that the brake has been fully released.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

La présente invention concerne un outil de dégagement de frein incluant une structure en deux éléments dans laquelle une partie accessible depuis l'extérieur de l'actionneur de frein ne s'éloigne pas axialement de l'actionneur de frein pendant l'opération de contention. De ce fait, moins de place est requise à l'extérieur du carter de l'actionneur de frein que dans l'état antérieur de la technique. Le procédé consiste à faire tourner par un opérateur un boulon extérieur (38) qui fait tourner un écrou (42) à filetage intérieur. Cet écrou à filetage interne se déplace axialement jusqu'à toucher un piston, puis agit sur le piston pour provoquer la contention du ressort. Le boulon n'a pas besoin de se déplacer axialement vers l'extérieur. Selon d'autres réalisations, le dispositif est équipé d'une structure visible de l'extérieur de la chambre de frein pour donner une indication du moment où le frein est totalement débloqué. Selon une réalisation, cette structure est un témoin mobile (120) qui dépasse du carter lorsque le ressort est au moins partiellement en contention. Le témoin se rentre lorsque le ressort a été totalement dégagé. Selon une seconde réalisation, on utilise un boulon de déblocage (142) à double filetage. Dans ce cas, le dépassement du boulon hors du carter fournit une indication que le ressort n'a pas été totalement dégagé.
EP96928146A 1995-08-15 1996-08-14 Outil de degagement d'actionneur de frein a ressort Withdrawn EP0845072A4 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US515239 1995-08-15
US08/515,239 US5636562A (en) 1995-08-15 1995-08-15 Spring brake actuator with release tool requiring limited axial space
US574611 1995-12-19
US08/574,611 US5632192A (en) 1995-12-19 1995-12-19 Spring brake actuator with indicator for fully released condition
US08/581,120 US5623863A (en) 1995-12-29 1995-12-29 Dual-thread release bolt for spring brake actuator
US581120 1995-12-29
PCT/US1996/013116 WO1997007322A1 (fr) 1995-08-15 1996-08-14 Outil de degagement d'actionneur de frein a ressort

Publications (2)

Publication Number Publication Date
EP0845072A1 true EP0845072A1 (fr) 1998-06-03
EP0845072A4 EP0845072A4 (fr) 1998-10-07

Family

ID=27414591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96928146A Withdrawn EP0845072A4 (fr) 1995-08-15 1996-08-14 Outil de degagement d'actionneur de frein a ressort

Country Status (6)

Country Link
EP (1) EP0845072A4 (fr)
JP (1) JP4130976B2 (fr)
AU (1) AU6772796A (fr)
CA (1) CA2228810A1 (fr)
MX (1) MX9801220A (fr)
WO (1) WO1997007322A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002226348A1 (en) * 2000-11-28 2002-06-11 Knorr-Bremse Systeme Fur Nutzfahrzeuge Gmbh Pressure-accumulating brake cylinder with release spindle indicator
TR200604672A2 (tr) * 2006-08-29 2008-03-21 Arfesan Arkan Fren Elemanlari Sanayi̇ Ve Ti̇caret A.Ş. Kurma civatası dışarı çıkmayan imdatlı fren körüklerinde, körüğün kurulmuş durumda olduğunu, kullanıcıya ikaz eden indikatör
TR200604673A2 (tr) * 2006-08-29 2008-03-21 Arfesan Arkan Fren Elemanlari San. Ve Ti̇c. A.Ş. İmdatlı fren körükleri için ağızlı kurma civatası
DE102007015208B4 (de) 2007-03-27 2008-12-04 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Kompakt-Kombizylinder mit manueller Lösevorrichtung
DE102007041769A1 (de) 2007-09-04 2009-03-05 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Federspeicherbremszylinder mit verrastetem Anschlagkörper
DE102008061346A1 (de) 2008-12-10 2010-06-17 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Federspeicherbremszylinder mit äußerer Entlüftung
EP2514648B1 (fr) 2009-12-16 2017-03-22 Nabtesco Automotive Corporation Structure pour récepteur de freinage à ressorts
CN102562883A (zh) * 2012-01-11 2012-07-11 瑞立集团瑞安汽车零部件有限公司 一种汽车制动气室的短拉杆装置
US9085309B2 (en) * 2012-12-05 2015-07-21 Wabtec Holding Corp. Spring-applied parking brake with ball screw reset mechanism
US9487203B2 (en) * 2013-04-10 2016-11-08 G&P Automotive Co., Ltd. Brake actuator
DE102013114897A1 (de) 2013-12-27 2015-07-02 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Federspeicherbremszylinder mit Notlöseeinrichtung
PL2944529T3 (pl) * 2014-05-14 2017-09-29 Wabco Europe Bvba Sprężynowy siłownik hamulca do stosowania w pojazdach użytkowych, śruba zwalniająca i zastosowanie takiej śruby w wymienionym sprężynowym siłowniku hamulca
JP7081593B2 (ja) 2017-04-20 2022-06-07 日本電気株式会社 機器管理システム、モデル学習方法およびモデル学習プログラム
EP3953226B1 (fr) * 2019-04-08 2024-01-03 ZF CV Systems Europe BV Frein a ressort, système de freinage, véhicule
EP3753796B1 (fr) * 2019-06-20 2023-11-01 ZF CV Systems Europe BV Actionneur de frein à ressort et mécanisme de libération de frein pour un tel actionneur de frein à ressort
EP4279348A1 (fr) 2022-05-18 2023-11-22 ZF CV Systems Europe BV Actionneur de frein à ressort comprenant un fond de boîtier doté d'un gaufrage pour un ressort de compression, et véhicule utilitaire comprenant un actionneur de frein à ressort correspondant

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1477006A (fr) * 1966-04-21 1967-04-14 Halcon International Inc Dispositif de fixation indicateur de contrainte
EP0530461A1 (fr) * 1991-09-02 1993-03-10 WABCO STANDARD GmbH Dispositif de déplacement axial d'une pièce

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117496A (en) * 1959-12-01 1964-01-14 Berg Airlectro Products Compan Safety brake chamber
US3508470A (en) * 1969-03-10 1970-04-28 Certain Teed Prod Corp Brake actuator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1477006A (fr) * 1966-04-21 1967-04-14 Halcon International Inc Dispositif de fixation indicateur de contrainte
EP0530461A1 (fr) * 1991-09-02 1993-03-10 WABCO STANDARD GmbH Dispositif de déplacement axial d'une pièce

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9707322A1 *

Also Published As

Publication number Publication date
MX9801220A (es) 1998-04-30
CA2228810A1 (fr) 1997-02-27
JP4130976B2 (ja) 2008-08-13
JPH11511091A (ja) 1999-09-28
WO1997007322A1 (fr) 1997-02-27
EP0845072A4 (fr) 1998-10-07
AU6772796A (en) 1997-03-12

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