WO1994011648A1 - Internal shoe brake with adjusting device - Google Patents
Internal shoe brake with adjusting device Download PDFInfo
- Publication number
- WO1994011648A1 WO1994011648A1 PCT/GB1993/002347 GB9302347W WO9411648A1 WO 1994011648 A1 WO1994011648 A1 WO 1994011648A1 GB 9302347 W GB9302347 W GB 9302347W WO 9411648 A1 WO9411648 A1 WO 9411648A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brake
- shoe
- lever
- adjuster
- bush
- Prior art date
Links
Classifications
-
- 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
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
- F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
- F16D65/561—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting within the confines of a drum brake
- F16D65/562—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting within the confines of a drum brake arranged between service brake actuator and braking member, and subjected to service brake force
-
- 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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/02—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as one or more circumferential band
- F16D51/04—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as one or more circumferential band mechanically actuated
-
- 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
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
-
- 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
- F16D65/46—Slack adjusters mechanical non-automatic with screw-thread and nut
-
- 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
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/58—Mechanical mechanisms transmitting linear movement
- F16D2125/60—Cables or chains, e.g. Bowden cables
-
- 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
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/58—Mechanical mechanisms transmitting linear movement
- F16D2125/68—Lever-link mechanisms, e.g. toggles with change of force ratio
Definitions
- This invention relates to internal show assemblies, in particular for vehicles, and which are of the type which utilise a single circular brake shoe.
- an internal shoe brake having a substantially circular brake shoe mounted on a support and having a mechanical actuator located between a pair of opposed ends of the shoe for moving said brake shoe ends apart to apply the brake
- the brake being characterised in that the actuator comprises a first lever pivotted at one end on the support and having an abutment surface thereon for contacting one shoe end and a brake operating means connected to the other end of the first lever; a second lever pivotted at its one end away from the said first lever on the support and having an abutment surface thereon operatively connected with the other shoe end, the other end of the second lever being pivotally connected to said one end of said first lever; and a brake shoe clearance adjuster means mounted on the support and located between said other shoe end and the abutment surface on the second lever to transmit loads from the actuator to said other shoe end.
- the brake shoe clearance adjuster means may comprise a hollow sliding bush mounted on the support and having an internal screw thread and an abutment at one end for contact with the support, and a screw threaded tappet mounted in the bush, the tappet having a head portion abutting said other shoe end, the overall length of the adjuster means and hence the brake shoe clearance being adjustable by rotation of the bush.
- Fig 2 is a section in the II-II of fig 1;
- Fig 3 is an elevation of the mounting block used in
- Fig 4 is a view of the adjuster means used in the brake of Fig 1;
- Fig 5 is an elevation of an alternative mounting block and belt-operated adjuster arrangement
- Figs 6 & 7 are views on lines VI-VI and VII-VII respectively of Fig 5;
- Fig 8 is a sectional view corresponding to Fig 6 of an alternative sealed arrangement
- Fig 9 is a part sectional view, corresponding to
- FIG. 1 With reference to figs 1 to 3 of the drawings there is illustrated an internal shoe brake of the type used in conjunction with a disc brake.
- a disc rotor 11 is mounted on a stub axle for rotation with the wheel in a well known manner (see fig 2).
- the internal cylindrical surface 12 of the rotor has a cylindrical braking surface formed thereon for engagement with a friction lining of an internal brake 13 for parking purposes.
- the internal brake 13 comprises a single substantially circular brake shoe 14 having a pair of opposed brake shoe ends 15 and 16 between which a mechanical actuator 17 is located.
- the brake shoe has a pair of spaced arcuate linings 18, 19 thereon which in use contact the braking surface 12 for operation of the brake.
- the brake shoe 14 and actuator 17 are mounted on a back plate 20 which is mounted onto a vehicle suspension component 22.
- the actuator 17 is mounted in a support block 23 which is bolted through the back plate 20 onto the suspension component 22 so that the mounting block 23 takes all the brake operating loads.
- the brake shoe 14 is held to the back plate 20 by the actuator 17 and a hold down clip 21 located between the linings 18 and 19, diametrally opposite to the actuator 17.
- the actuator 17 is operated by a pull cable 24 which passes through an aperture 25 in the backplate and which reacts against the support block 23 to operate the actuator 17 to move the brake shoe ends 15 and 16 apart to apply the brake.
- the actuator 17 is a two lever toggle mechanism.
- a first inner lever 31 is pivoted at one end 32 on the support block 23 with an abutment surface 36 adjacent thereto contacting one brake shoe end 16 (or as shown on the head 33 of the bolt 34 securing the support block to the vehicle suspension).
- Cable 24 is attached to the other end 35 of the lever 31.
- a second outer double lever ' 41 is pivotted at its end 42, away from the first lever, on a raised portion 43 of the support block 23 and has an abutment surface 44 for contacting the other brake shoe end 15 adjacent thereto.
- the other end of lever 41 is pivotally connected by pin 45 to said one end portion of the first lever 31.
- the raised portion 43 of the support block 23 has a cylindrical bore 51 (see fig 3) in which an adjuster means 50 (see fig 4) is slidably located.
- the adjuster means 50 comprises a bush 52 and a tappet 55.
- the bush 52 has an internal screw thread 53 and an abutment in the form of a raised collar 54 at one end with a ratchet formed thereon.
- the tappet 55 has a head 56 for engaging said other end 15 of the brake shoe and a screw-threaded stem 57 which engages the screw thread 53 in the bush.
- the bush 52 is arranged in the cylindrical bore 51 with the collar 54 adjacent the shoe end 15 so that, when the brake is in an inoperative condition, the shoe pull-off mechanism (pull springs or the resilience of the single shoe) pushes the collar 54 against the block 23.
- the shoe pull-off mechanism pull springs or the resilience of the single shoe
- the second lever 41 has a spigot 44a on its abutment surface 44 that locates in the screw-threaded centre of the bush 52.
- the arrangement being such that when a pull is effected on the cable 24, the first lever 31 pivots about its abutment 36 on the shoe end 16 and its one end 32 acts against the support block 23 (bolt head 33), simultaneously the movement of the other end 35 of the first lever 31 about said one end 32, effectively causes the pivot pin 45 to move towards the other brake shoe end 15.
- the movement of the pin 45 is transmitted to the second lever 41 which acts on the other shoe end 15 via the spigot 44a and the adjuster means 50 which is slideably mounted in the support block 23.
- Cable 24 is operated by a hand lever mechanism (not shown) and is for parking purposes only. The pull on the cable 24 continues until both shoe ends 15 and 16 are thrust against the drum surface 12.
- the adjustment is effected manually by rotating the collar 54 by engagement with the ratchet surface thereon by, for example, a screw driver. The rotation of the collar 54, and hence the bush 52, jacks out the tappet 55 to take up any excess clearances between the linings 18, 19 and the braking surface 12.
- the method of rotating collar 54 may be made more convenient by the modified collar arrangement shown in figures 5 to 7 in which bush 52 (shown reversed left to right compared with figures 1 and 2) is mounted in bore 51 in support block 23. Collar 54 on bush 52 is provided with ratchet teeth 60 which engage teeth 61 an internally-toothed belt 62 part of which encircles collar 54 and is held in engagement with the teeth 60 by flange portion 65 of the support block.
- Part 62A of the belt 62 projects from the back of the brake via an aperture 66 in the support block 23 and a corresponding aperture 67 in the back plate 20.
- longitudinal displacement of part 62A of the belt causes rotation of collar 54 which jacks tappet 55 in or out of bush 52, depending on the direction of rotation of collar 54, to adjust the brake lining clearances as previously described.
- the automatic adjuster 70 is of the form described and claimed in the Applicant's co-pending Application No EP-A-0 388 057 comprising a first end member in the form of a tappet 71 which engages shoe end 15, an intermediate member 72 which is screw-threaded to tappet 71 at 73, and a second end member 74 which is a sliding fit on the intermediate member 72.
- a sleeve 75 surrounds the intermediate member 72 and is axially located thereon by a circlip 76.
- Intermediate member 72 is provided with ratchet wheel teeth 77 which are engaged by a pawl 78 formed on a leaf spring 79.
- the ends 80 and 81 of spring 79 are supported on undercut formations 82 and 83 on sleeve 75 and second end member 74.
- Spigot 44a on second lever 41 engages in the free end of the bore 84 in second end member 74 which receives intermediate member 72.
- Sleeve 75 is provided with a stepped end flange 85 which is held in a support tube 86 mounted in a bore 87 in support 23.
- the adjuster 70 provides automatic adjustment of brake shoe clearance throughout the life of the shoe.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU54314/94A AU5431494A (en) | 1992-11-14 | 1993-11-15 | Internal shoe brake with adjusting device |
EP93924770A EP0620901A1 (en) | 1992-11-14 | 1993-11-15 | Internal shoe brake with adjusting device |
JP6511873A JPH07503307A (en) | 1992-11-14 | 1993-11-15 | Internal shoe brake with adjustment device |
GB9413432A GB2277567A (en) | 1992-11-14 | 1994-07-04 | Internal shoe brake with adjusting device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9223912.8 | 1992-11-14 | ||
GB929223912A GB9223912D0 (en) | 1992-11-14 | 1992-11-14 | An internal shoe brake |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994011648A1 true WO1994011648A1 (en) | 1994-05-26 |
Family
ID=10725098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1993/002347 WO1994011648A1 (en) | 1992-11-14 | 1993-11-15 | Internal shoe brake with adjusting device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0620901A1 (en) |
JP (1) | JPH07503307A (en) |
AU (1) | AU5431494A (en) |
GB (2) | GB9223912D0 (en) |
WO (1) | WO1994011648A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004025132A1 (en) * | 2002-09-11 | 2004-03-25 | Automotive Products Italia (Sv) S.P.A. | Parking brake of a drum brake |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1090058A (en) * | 1963-12-13 | 1967-11-08 | Heinz Teves | Improvements in or relating to brakes for motor vehicles |
DE2158044A1 (en) * | 1971-11-23 | 1973-05-24 | Teves Gmbh Alfred | AUTOMATIC ADJUSTMENT DEVICE FOR A DRUM BRAKE |
GB2225069A (en) * | 1988-10-12 | 1990-05-23 | Daimler Benz Ag | Brake shoe adjustment device |
EP0388057A1 (en) * | 1989-03-11 | 1990-09-19 | Automotive Products Plc | Automatic adjuster for drum brake |
EP0482430A1 (en) * | 1990-10-23 | 1992-04-29 | Knott GmbH | Internal shoe brake with adjusting device |
-
1992
- 1992-11-14 GB GB929223912A patent/GB9223912D0/en active Pending
-
1993
- 1993-11-15 AU AU54314/94A patent/AU5431494A/en not_active Abandoned
- 1993-11-15 JP JP6511873A patent/JPH07503307A/en active Pending
- 1993-11-15 WO PCT/GB1993/002347 patent/WO1994011648A1/en not_active Application Discontinuation
- 1993-11-15 EP EP93924770A patent/EP0620901A1/en not_active Withdrawn
-
1994
- 1994-07-04 GB GB9413432A patent/GB2277567A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1090058A (en) * | 1963-12-13 | 1967-11-08 | Heinz Teves | Improvements in or relating to brakes for motor vehicles |
DE2158044A1 (en) * | 1971-11-23 | 1973-05-24 | Teves Gmbh Alfred | AUTOMATIC ADJUSTMENT DEVICE FOR A DRUM BRAKE |
GB2225069A (en) * | 1988-10-12 | 1990-05-23 | Daimler Benz Ag | Brake shoe adjustment device |
EP0388057A1 (en) * | 1989-03-11 | 1990-09-19 | Automotive Products Plc | Automatic adjuster for drum brake |
EP0482430A1 (en) * | 1990-10-23 | 1992-04-29 | Knott GmbH | Internal shoe brake with adjusting device |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004025132A1 (en) * | 2002-09-11 | 2004-03-25 | Automotive Products Italia (Sv) S.P.A. | Parking brake of a drum brake |
GB2408549A (en) * | 2002-09-11 | 2005-06-01 | Automotive Products Italia | Parking brake of a drum brake |
GB2408549B (en) * | 2002-09-11 | 2007-03-28 | Automotive Products Italia | Parking brake of a drum brake |
US8220597B2 (en) * | 2002-09-11 | 2012-07-17 | Automotive Products Italia (Sv) S.R.L. | Parking brake of a drum brake |
Also Published As
Publication number | Publication date |
---|---|
EP0620901A1 (en) | 1994-10-26 |
GB2277567A (en) | 1994-11-02 |
AU5431494A (en) | 1994-06-08 |
GB9413432D0 (en) | 1994-08-31 |
JPH07503307A (en) | 1995-04-06 |
GB9223912D0 (en) | 1993-01-06 |
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