CA1075176A - Drum brake and mounting means therefor - Google Patents
Drum brake and mounting means thereforInfo
- Publication number
- CA1075176A CA1075176A CA296,791A CA296791A CA1075176A CA 1075176 A CA1075176 A CA 1075176A CA 296791 A CA296791 A CA 296791A CA 1075176 A CA1075176 A CA 1075176A
- Authority
- CA
- Canada
- Prior art keywords
- pair
- brake shoes
- brake
- backing plate
- recesses
- 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.)
- Expired
Links
- 230000014759 maintenance of location Effects 0.000 claims description 3
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 1
- 101100353419 Bacillus subtilis (strain 168) proJ gene Proteins 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
- F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
- F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
- F16D51/24—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots fluid 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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/46—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action
- F16D51/48—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action with two linked or directly-interacting brake shoes
-
- 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
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging 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
- F16D65/52—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
- F16D65/565—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 diametrically opposite to service brake actuator, and subjected to service brake force
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
DRUM BRAKE AND MOUNTING MEANS THEREFOR
ABSTRACT OF THE DISCLOSURE
A drum brake is provided with a pair of brake shoes having axially inner and outer webs for supporting friction linings. A backing plate mounts the pair of brake shoes by providing radially outwardly extending lugs which are disposed between the inner and outer webs to prevent axial movement of the pair of brake shoes. Moreover, springs are disposed between respective lugs and portions extending between the webs to bias the portions into engage-ment with recesses on the backing plate. A double hydraulic actuator is positioned between the pair of braking shoes with one actuator cooperating with the inner webs and the other actuator cooperating with the outer webs during a braking application to urge the friction linings into engagement with a drum. The inner and outer webs also include slots substantially opposite the double hydraulic actuator for receiving plates which mount an adjustment mechanism between the pair of brake shoes.
ABSTRACT OF THE DISCLOSURE
A drum brake is provided with a pair of brake shoes having axially inner and outer webs for supporting friction linings. A backing plate mounts the pair of brake shoes by providing radially outwardly extending lugs which are disposed between the inner and outer webs to prevent axial movement of the pair of brake shoes. Moreover, springs are disposed between respective lugs and portions extending between the webs to bias the portions into engage-ment with recesses on the backing plate. A double hydraulic actuator is positioned between the pair of braking shoes with one actuator cooperating with the inner webs and the other actuator cooperating with the outer webs during a braking application to urge the friction linings into engagement with a drum. The inner and outer webs also include slots substantially opposite the double hydraulic actuator for receiving plates which mount an adjustment mechanism between the pair of brake shoes.
Description
~75~7~;
l~hi.s invellti.on re~.ates to a drurn hrake for a vehicle.
Drum brakes qcnerally provide a pai.r oE brake shoes slidably mounted relative -to a backing plate and engageable with a hub to retard the rotation of the hub.
Such drum brakes also dispose a hydraulic actuator arld an adjustment mechanism betwecn thc pair of brake shoes at opposite locations. r~'he pair of brake shoes are urgecl radially outwardly by the hydrau.li.c ac-tuator and the adjustment mechanism maintains a running clearance between the pair of brake shoes and the hub.
As the drum brake is disposed wi.thin the hub on - a vehicle axle assembly and an axle shaft extends through a central opening on the backin~ plate, it is desirable to provide a simple drum brake construction which is narrow in the radial di.mension.
The present i.nvention resides in a drum brake Eor a véhicle, there being provided a backing plate secured ~ to a non-rotatable portion of the vehicle, the backing plate having a plurallty of lugs extending radially there-from. A pair of brake shoes cooperate with the lugs to prevent axial movement between the backing plate al~d the pair of brake shoes, and resilient means extending from at l~ast one of the lugs and engaging at least one of the pair of brake shoes, the pair of brake shoes defining a radial width:, and the resilient means normally beinq disposed entirely within the radial width and biasing the one pair of~brake shoes to a non-braki.ng position.
ccording to another aspect of the present invention, there is provided a drum brake for a vehicle, the brake including a backing plate secured to a non-rotat~ble portion oE the vehic].e and including a plurality of radi.ally extending lugs and at least a pair of radiall5 ,~ 1 ' .~L, ' ~ sb/;.~;
, ~ :...................... . . . .
- . . . :. . . ., . . ; :
75.~
extendintJ f~ gC!S hav:irly recesses ther~on. At least a pair of brake shoes erlgagea~le with thc lugs to remain substanti~lly a~ially fixcd relativ~ to 1,he bac'ing platc while being radially movable during a braking app]ication, the pair of brake shoes inclucl'ir-y portions cxtending into the recesses on the backing plate. Resilient means biasing the portions of the pair of brake shoes into engagement with the backing plate recesses so that the pair of brake shoes are movable radially during ~ braking application to move the portions out of engagemcnt with the recesses in opposition to thc resilicnt mea~s.
hydraulic actuator cooperates with one end of the pair of hrake shoes to move the pair of bra};e shoes radially, and an adjustment means cooperate with the other end of each pair of bxake shoes to move the pair of brake shoes radially, the hydraulic actuator cooperating with the one end of each pair of brake shoes ne,ar the backing plate recésses. The pair of brake shoes includes slots ancl the adjustment means is secured -to the slots, the adjustment means including a pair of plates, one of the pair of plates'heing disposed in one of the pair of brake shoe slots, and the other pair oE plates being disposed in the other of the pair of brake shoe slots. An extensible member extends between the pair of plates and operatively - engages each plate to prevent rotation relative thereto, and a retention spring engages one of the plates and urges the pair of bxake shoes together.
BRIEF DESCRIPTION OF THE DRAWINGS
:
Pigure 1 is a front view of a drum brake made in accordance with the present invention;
' Figure 2 is a cross section taken along the line
l~hi.s invellti.on re~.ates to a drurn hrake for a vehicle.
Drum brakes qcnerally provide a pai.r oE brake shoes slidably mounted relative -to a backing plate and engageable with a hub to retard the rotation of the hub.
Such drum brakes also dispose a hydraulic actuator arld an adjustment mechanism betwecn thc pair of brake shoes at opposite locations. r~'he pair of brake shoes are urgecl radially outwardly by the hydrau.li.c ac-tuator and the adjustment mechanism maintains a running clearance between the pair of brake shoes and the hub.
As the drum brake is disposed wi.thin the hub on - a vehicle axle assembly and an axle shaft extends through a central opening on the backin~ plate, it is desirable to provide a simple drum brake construction which is narrow in the radial di.mension.
The present i.nvention resides in a drum brake Eor a véhicle, there being provided a backing plate secured ~ to a non-rotatable portion of the vehicle, the backing plate having a plurallty of lugs extending radially there-from. A pair of brake shoes cooperate with the lugs to prevent axial movement between the backing plate al~d the pair of brake shoes, and resilient means extending from at l~ast one of the lugs and engaging at least one of the pair of brake shoes, the pair of brake shoes defining a radial width:, and the resilient means normally beinq disposed entirely within the radial width and biasing the one pair of~brake shoes to a non-braki.ng position.
ccording to another aspect of the present invention, there is provided a drum brake for a vehicle, the brake including a backing plate secured to a non-rotat~ble portion oE the vehic].e and including a plurality of radi.ally extending lugs and at least a pair of radiall5 ,~ 1 ' .~L, ' ~ sb/;.~;
, ~ :...................... . . . .
- . . . :. . . ., . . ; :
75.~
extendintJ f~ gC!S hav:irly recesses ther~on. At least a pair of brake shoes erlgagea~le with thc lugs to remain substanti~lly a~ially fixcd relativ~ to 1,he bac'ing platc while being radially movable during a braking app]ication, the pair of brake shoes inclucl'ir-y portions cxtending into the recesses on the backing plate. Resilient means biasing the portions of the pair of brake shoes into engagement with the backing plate recesses so that the pair of brake shoes are movable radially during ~ braking application to move the portions out of engagemcnt with the recesses in opposition to thc resilicnt mea~s.
hydraulic actuator cooperates with one end of the pair of hrake shoes to move the pair of bra};e shoes radially, and an adjustment means cooperate with the other end of each pair of bxake shoes to move the pair of brake shoes radially, the hydraulic actuator cooperating with the one end of each pair of brake shoes ne,ar the backing plate recésses. The pair of brake shoes includes slots ancl the adjustment means is secured -to the slots, the adjustment means including a pair of plates, one of the pair of plates'heing disposed in one of the pair of brake shoe slots, and the other pair oE plates being disposed in the other of the pair of brake shoe slots. An extensible member extends between the pair of plates and operatively - engages each plate to prevent rotation relative thereto, and a retention spring engages one of the plates and urges the pair of bxake shoes together.
BRIEF DESCRIPTION OF THE DRAWINGS
:
Pigure 1 is a front view of a drum brake made in accordance with the present invention;
' Figure 2 is a cross section taken along the line
2-2 of Figure l;
, - 2 - , sb/.l ~
. :, :
. .
.. . . . ..
S~l7~
Figure 3 is a cross section takcn along the line 3-3 of Fi~ure 1;
Fig~lre 4, which appears on the same sheet as Figure 1, is a cross section taken aloncJ the line 4-4 of Figure l; and Figure 5 is a cutaway oE the clrcumscribed portion of Figure 1 showing the resiliQnt mounting o~ the -brake shoe on the backing plate.
DET~ILED DESCRIPTION
A drum brake ;llustrated in Figure 1 is generally referred to by numeral 10. The drum brake includes a backincJ plate 12 which is provided with a plurality of radially outwardly and axially outwardly extending lugs 1~. The backing plate is secured to a non-rotating portion of a wheel assembly such as a flange on the axle housing ~not shown).
A pair of brake shoes, 16 and,18, are supported by the backing plate 12 in a manner to be described hereinafter and are movable radially for engagement with a rotating hub to effectuate braking. The brake shoe 16 is provided with a friction lining 20, an axial outer web 22 and an axial inner web 24 such that the ou-ter web 22 -and the inner web 24 slidingly engage the lugs 14 when -the brake shoe 16 is supported by the backing plate 12.
~~ This slicling engagement between the lugs 14 and the webs ~: .
22, 24 provides ~or radial movement of the brake shoe 16 but prevents any axial movement therebetween. Consequently, - the axial width of the lugs 1~ is substantially equal to the spacing~between the inner ~eb 24 and the outer web 22.
::: : , The brake shoe 18 is also provided with a friction lining 26, an axial outer web 28 and an axial inner wcb 30. Moreover, the spacing between the respective inner and outer webs 30 and 28, is _ , .~3'' :
r sb~
~; . ' , . : ' ' ' . ~ ' -SLlCh thaL 'thfJ J.~I~Js 1/1 s~ ncJly cn~J~ c ti'le ~'/CbS 2f3 arl~]
30 to permi.t ra~l.i.a]. rnovc~mcnt of bral~.e 51loC 113 y~t prC!V~rl't axial movclllellt c)f thc hrake 1~3 rclativc to thc l~f~
;.:, -.: -: ~
, . , '~:
.
. '
, - 2 - , sb/.l ~
. :, :
. .
.. . . . ..
S~l7~
Figure 3 is a cross section takcn along the line 3-3 of Fi~ure 1;
Fig~lre 4, which appears on the same sheet as Figure 1, is a cross section taken aloncJ the line 4-4 of Figure l; and Figure 5 is a cutaway oE the clrcumscribed portion of Figure 1 showing the resiliQnt mounting o~ the -brake shoe on the backing plate.
DET~ILED DESCRIPTION
A drum brake ;llustrated in Figure 1 is generally referred to by numeral 10. The drum brake includes a backincJ plate 12 which is provided with a plurality of radially outwardly and axially outwardly extending lugs 1~. The backing plate is secured to a non-rotating portion of a wheel assembly such as a flange on the axle housing ~not shown).
A pair of brake shoes, 16 and,18, are supported by the backing plate 12 in a manner to be described hereinafter and are movable radially for engagement with a rotating hub to effectuate braking. The brake shoe 16 is provided with a friction lining 20, an axial outer web 22 and an axial inner web 24 such that the ou-ter web 22 -and the inner web 24 slidingly engage the lugs 14 when -the brake shoe 16 is supported by the backing plate 12.
~~ This slicling engagement between the lugs 14 and the webs ~: .
22, 24 provides ~or radial movement of the brake shoe 16 but prevents any axial movement therebetween. Consequently, - the axial width of the lugs 1~ is substantially equal to the spacing~between the inner ~eb 24 and the outer web 22.
::: : , The brake shoe 18 is also provided with a friction lining 26, an axial outer web 28 and an axial inner wcb 30. Moreover, the spacing between the respective inner and outer webs 30 and 28, is _ , .~3'' :
r sb~
~; . ' , . : ' ' ' . ~ ' -SLlCh thaL 'thfJ J.~I~Js 1/1 s~ ncJly cn~J~ c ti'le ~'/CbS 2f3 arl~]
30 to permi.t ra~l.i.a]. rnovc~mcnt of bral~.e 51loC 113 y~t prC!V~rl't axial movclllellt c)f thc hrake 1~3 rclativc to thc l~f~
;.:, -.: -: ~
, . , '~:
.
. '
3 a '~' ' ' :' sb/.) ;.~ . .
~ 5~L~Y6 The backing plate 12 includes a pair of rad7ally extendlng flanges at 32 and 34 which are provlded with contoured recesses at 36 and 38 respec~
tlvely. The contoured recesses recelve correspondlng plns 40 and 42 whlch are secured to the inner and outer webs of the brake shoes 18 and 16 respec-tlvely. The plns 40 and 42 are inserted In matchtng openings on the webs and secured thereto by any sultable means such as welding. In order to reslllently reta1n the pins In engagement with the contoured recesses two of the 1ugs 14 on the backlng plate 12 are provlded with proJections at 44 and 46. The proJ~ctlons mount correspondlng sprtngs 48 and 50 which reslllently engage the respectTve pins 40 and 42 to blas the same Into engage-ment wTth ~he contoured recesses. Morcover tho ends of the springs engagtng the plns are V-shaped to mainta1n their engagement wlth the correspondlng plns. The contour of the recesses at 36 and 38 ts such that the plns wtthln ~hese recesses can move radlally out of engagement wJth the recesses ; to contract the correspondlng sprtngs 48 and 50 durlng a braklng appllcation.
Consequently ~he plns move In opposTtlon to the sprfngs to engage the frlctlon ltnlnss wlth the drum durlng braking and the springs urge ~he brake shoes away from the drum such that the ptns engage the con~oured recesses wh~n brak7ng ts not occurrlngO
It 1s an importan~ feature of the present inventlon that the backlng plate proJectlons 44 and 46~ the sprlngs 48 and 50 the pins 40 and '~2 and the flanges 32 and 34 are dtsposed between the Tnner and outer webs and substantlally wlthln the rad1al wldth of these webs. With thls structural arrangsment the drum brake 10 takes up llttle radtal width thereby enabllng large axle shafts to extend through the drum brake assembly.
The brake shoes 16 and 18 cooperate with each other ~o support a float7ng double cyltnder or hy~raullc actuaeor 60 and an adJustment me~ns 62 opposite the double actuator fiO. The doubl~ actuator 60 and the adjustment m~ans 62 are supported by the tnn~r webs 24 and 30 and the outer webs 22 and 28 of bral<~ shoes 16 and 18.
-, ~ , .
~7~'7~ ' Turntng to Figure 2, the double actuator 60 Includes a hous1ny 6 w7th two parallel bores 66 and 68 for slldably re~elvlng p1ston 70 ~nd plston 72 tn seallng engagement with the bores. The houslng 64 defines a common pressure ~h~mber 74 communtcat7n!g wtth a mast0r cylInder (not shown)0 The chamber 74 communlcates wTth p7ston 70 and piston 72 so that pressurized fluid wl~htn chamber 74 urges p7ston 70 and piston 72 away from chamber 7k. Viewlng Ftgure 19 Tt Is seen that the houslng 64 and the plston 70 include grooves or Ind0ntations at 76 and 78 for receiv-lng extens10ns 80 and 82 on the ou~er webs of brake shoes 16 and 1~, res-10 pectively. The houslng 6l1 Includes a second groove for recelving the exten-slon tnot shown) on the Inner web 24 and the p1ston 72 includes a s0cond groove for rece1vlng the extenslon ~not shown) on the tnnar web 30~
As the four grooves or Inden~atlons each recelve an extenslon of elther brake shoe 16 and 18~ the double hydraullc aotuator 60 is pre-vented from rotatlng relative to the shoes whTle belng carrled between the latter. A sealtng boot 84 protects th~ bores 66 and 68 from con-tamlnatlon.
; The adJustment means 62 includes an extensible member 86 whichis carrTed betwe~n ~wo plates 88 and 90 seeured, respec~Tvely, to the 20 brake sho~ 16 and the ~rake shoe 780 The plate 88 Is press fltted Into s10t 92 on outer web 22 and s10t 94 on inner web 24 in order to secure ~hs plate 88 to the shoe 16; however, other su1table means ~or rece1vTng the plate 88 are acceptable. The plate 90 7s secure~ to the shoe 18 Tn a sJmllar manner vla slots on ~he latter.
The extenslble member 86 compr7ses a rotatlng portTon 93 havlng a star wheel 96 en~aglng a pawl 98 and two stationary portions engaglng plates 88 and ~0 via V~shaped recesses at 100 and 102. The V~shaped recesses permlt s71ght rotatlon of ~he extensTble member 86 In the radial plane rela~Tve to the brake shoes. The pawl 98 includes a 30 groove at 104 for plvoting about p1ate 88 and a sprlng 106 ma7ntains . .
~ 5 --,, . . . ~ .
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.
:. ,, . .
the pawl In engagement wlth the star wheel. Inserts at 120 on plates 88 and ~0 engage the groove 104 and the spr7ng 106 to flx the same axlally thereto.
Plvoting legs 108 and 110 connec:t wfth rocker arm 112, whlle leg 110 ts anchored to the back1ng p1ats at 114 and leg 108 connects wtth pawl 98. The sprlng 106 maintalns the plates 88 and 90 In engage-ment wlth the V-shaped recesses 100 and 102 and imparts rotatlon to the portlon 93 vla the star wheel 96 when the pawl 98 rotates through an Incre-ment of the star whee7 In a manner well known in the art.
Whlle the 7nventlon has been descrlbed In conJunctTon wlth a speclfTc embodlment, 7t Is evldent that many alternatives, modlflcatlons and varlatlons are apparen~ to one sktlled In the art. Consequently, these alternatives, mocilflcatlons and varlatlons are lntended to fall wlthln the scope of the appended clalms.
,: ~ S -- .
!
~ 5~L~Y6 The backing plate 12 includes a pair of rad7ally extendlng flanges at 32 and 34 which are provlded with contoured recesses at 36 and 38 respec~
tlvely. The contoured recesses recelve correspondlng plns 40 and 42 whlch are secured to the inner and outer webs of the brake shoes 18 and 16 respec-tlvely. The plns 40 and 42 are inserted In matchtng openings on the webs and secured thereto by any sultable means such as welding. In order to reslllently reta1n the pins In engagement with the contoured recesses two of the 1ugs 14 on the backlng plate 12 are provlded with proJections at 44 and 46. The proJ~ctlons mount correspondlng sprtngs 48 and 50 which reslllently engage the respectTve pins 40 and 42 to blas the same Into engage-ment wTth ~he contoured recesses. Morcover tho ends of the springs engagtng the plns are V-shaped to mainta1n their engagement wlth the correspondlng plns. The contour of the recesses at 36 and 38 ts such that the plns wtthln ~hese recesses can move radlally out of engagement wJth the recesses ; to contract the correspondlng sprtngs 48 and 50 durlng a braklng appllcation.
Consequently ~he plns move In opposTtlon to the sprfngs to engage the frlctlon ltnlnss wlth the drum durlng braking and the springs urge ~he brake shoes away from the drum such that the ptns engage the con~oured recesses wh~n brak7ng ts not occurrlngO
It 1s an importan~ feature of the present inventlon that the backlng plate proJectlons 44 and 46~ the sprlngs 48 and 50 the pins 40 and '~2 and the flanges 32 and 34 are dtsposed between the Tnner and outer webs and substantlally wlthln the rad1al wldth of these webs. With thls structural arrangsment the drum brake 10 takes up llttle radtal width thereby enabllng large axle shafts to extend through the drum brake assembly.
The brake shoes 16 and 18 cooperate with each other ~o support a float7ng double cyltnder or hy~raullc actuaeor 60 and an adJustment me~ns 62 opposite the double actuator fiO. The doubl~ actuator 60 and the adjustment m~ans 62 are supported by the tnn~r webs 24 and 30 and the outer webs 22 and 28 of bral<~ shoes 16 and 18.
-, ~ , .
~7~'7~ ' Turntng to Figure 2, the double actuator 60 Includes a hous1ny 6 w7th two parallel bores 66 and 68 for slldably re~elvlng p1ston 70 ~nd plston 72 tn seallng engagement with the bores. The houslng 64 defines a common pressure ~h~mber 74 communtcat7n!g wtth a mast0r cylInder (not shown)0 The chamber 74 communlcates wTth p7ston 70 and piston 72 so that pressurized fluid wl~htn chamber 74 urges p7ston 70 and piston 72 away from chamber 7k. Viewlng Ftgure 19 Tt Is seen that the houslng 64 and the plston 70 include grooves or Ind0ntations at 76 and 78 for receiv-lng extens10ns 80 and 82 on the ou~er webs of brake shoes 16 and 1~, res-10 pectively. The houslng 6l1 Includes a second groove for recelving the exten-slon tnot shown) on the Inner web 24 and the p1ston 72 includes a s0cond groove for rece1vlng the extenslon ~not shown) on the tnnar web 30~
As the four grooves or Inden~atlons each recelve an extenslon of elther brake shoe 16 and 18~ the double hydraullc aotuator 60 is pre-vented from rotatlng relative to the shoes whTle belng carrled between the latter. A sealtng boot 84 protects th~ bores 66 and 68 from con-tamlnatlon.
; The adJustment means 62 includes an extensible member 86 whichis carrTed betwe~n ~wo plates 88 and 90 seeured, respec~Tvely, to the 20 brake sho~ 16 and the ~rake shoe 780 The plate 88 Is press fltted Into s10t 92 on outer web 22 and s10t 94 on inner web 24 in order to secure ~hs plate 88 to the shoe 16; however, other su1table means ~or rece1vTng the plate 88 are acceptable. The plate 90 7s secure~ to the shoe 18 Tn a sJmllar manner vla slots on ~he latter.
The extenslble member 86 compr7ses a rotatlng portTon 93 havlng a star wheel 96 en~aglng a pawl 98 and two stationary portions engaglng plates 88 and ~0 via V~shaped recesses at 100 and 102. The V~shaped recesses permlt s71ght rotatlon of ~he extensTble member 86 In the radial plane rela~Tve to the brake shoes. The pawl 98 includes a 30 groove at 104 for plvoting about p1ate 88 and a sprlng 106 ma7ntains . .
~ 5 --,, . . . ~ .
. .
.
:. ,, . .
the pawl In engagement wlth the star wheel. Inserts at 120 on plates 88 and ~0 engage the groove 104 and the spr7ng 106 to flx the same axlally thereto.
Plvoting legs 108 and 110 connec:t wfth rocker arm 112, whlle leg 110 ts anchored to the back1ng p1ats at 114 and leg 108 connects wtth pawl 98. The sprlng 106 maintalns the plates 88 and 90 In engage-ment wlth the V-shaped recesses 100 and 102 and imparts rotatlon to the portlon 93 vla the star wheel 96 when the pawl 98 rotates through an Incre-ment of the star whee7 In a manner well known in the art.
Whlle the 7nventlon has been descrlbed In conJunctTon wlth a speclfTc embodlment, 7t Is evldent that many alternatives, modlflcatlons and varlatlons are apparen~ to one sktlled In the art. Consequently, these alternatives, mocilflcatlons and varlatlons are lntended to fall wlthln the scope of the appended clalms.
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Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a drum brake for a vehicle, a backing plate secured to a non-rotatable portion of the vehicle, said backing plate having a plurality of lugs extending radially therefrom, a pair of brake shoes cooperating with said lugs to prevent axial movement between said backing plate and said pair of brake shoes and resilient means extending from at least one of said lugs and engaging at least one of said pair of brake shoes, said pair of brake shoes defining a radial width, and said resilient means normally being disposed entirely within said radial width and biasing said one pair of brake shoes to a non-braking position.
2. The drum brake of claim 1 in which at least one of said pair of brake shoes includes a pin and said backing plate includes a recess for receiving the pin, said resilient means engaging said pin and biasing the same into the recess, said resilient means being contracted as said one pair of brake shoes moves away from the non-braking position.
3. A drum brake for a vehicle comprising a backing plate secured to a non-rotatable portion of the vehicle, said backing plate including a plurality of radially extending lugs and a pair of radially extending flanges having recesses thereon;
at least a pair of brake shoes engageable with said lugs to remain substantially axially fixed relative to said backing plate while being radially movable during a braking application, said pair of brake shoes including portions extending into said recesses on said backing plate; and resilient means biasing the portions of said pair of brake shoes into engagement with said backing plate recesses whereby said pair of brake shoes are movable radially during a braking application to move the portions out of engagement with the recesses in opposition to said resilient means;
said pair of brake shoes defining a radial width, said lugs and said flanges extending into the radial width and said resilient means being normally disposed within the radial width and said resilient means remaining entirely within said radial width when said brake shoe portions are extended into said recesses on said backing plate.
at least a pair of brake shoes engageable with said lugs to remain substantially axially fixed relative to said backing plate while being radially movable during a braking application, said pair of brake shoes including portions extending into said recesses on said backing plate; and resilient means biasing the portions of said pair of brake shoes into engagement with said backing plate recesses whereby said pair of brake shoes are movable radially during a braking application to move the portions out of engagement with the recesses in opposition to said resilient means;
said pair of brake shoes defining a radial width, said lugs and said flanges extending into the radial width and said resilient means being normally disposed within the radial width and said resilient means remaining entirely within said radial width when said brake shoe portions are extended into said recesses on said backing plate.
4. The drum brake of claim 3 in which said portions comprise pins secured to each brake shoe and said resilient means extends from said lugs to said pins.
5. A drum brake for a vehicle comprising:
a backing plate secured to a non-rotatable portion of the vehicle, said backing plate including a plurality of radially extending lugs and at least a pair of radially extending flanges having recesses thereon;
at least a pair of brake shoes engageable with said lugs to remain substantially axially fixed relative to said backing plate while being radially movable during a braking application, said pair of brake shoes including portions extending into said recesses on said backing plate;
resilient means extending from at least one of said lugs biasing the portions of said pair of brake shoes into engagement with said backing plate recesses whereby said pair of brake shoes are movable radially during a braking application to move the portions out of engagement with the recesses in opposition to said resilient means; and a hydraulic actuator cooperating with one end of each pair of brake shoes to move said pair of brake shoes radially and an adjustment means cooperating with the other end of each pair of brake shoes to move said pair of brake shoes radially, said hydraulic actuator cooperating with the one end of each pair of brake shoes near said backing plate recesses;
said pair of brake shoes including slots and said adjustment means being secured to said slots, said adjustment means comprising a pair of plates, one of said pair of plates being disposed in one of said pair of brake shoe slots and the other of said pair of plates being disposed in the other of said pair of brake shoe slots, an extensible member extending between the pair of plates and operatively engaging each plate to prevent rotation relative thereto and a retention spring engaging one of the plates and urging said pair of brake shoes together; said pair of brake shoes defining a radial width, and said resilient means normally being disposed entirely within said radial width and biasing said one pair of brake shoes to a non-braking position.
a backing plate secured to a non-rotatable portion of the vehicle, said backing plate including a plurality of radially extending lugs and at least a pair of radially extending flanges having recesses thereon;
at least a pair of brake shoes engageable with said lugs to remain substantially axially fixed relative to said backing plate while being radially movable during a braking application, said pair of brake shoes including portions extending into said recesses on said backing plate;
resilient means extending from at least one of said lugs biasing the portions of said pair of brake shoes into engagement with said backing plate recesses whereby said pair of brake shoes are movable radially during a braking application to move the portions out of engagement with the recesses in opposition to said resilient means; and a hydraulic actuator cooperating with one end of each pair of brake shoes to move said pair of brake shoes radially and an adjustment means cooperating with the other end of each pair of brake shoes to move said pair of brake shoes radially, said hydraulic actuator cooperating with the one end of each pair of brake shoes near said backing plate recesses;
said pair of brake shoes including slots and said adjustment means being secured to said slots, said adjustment means comprising a pair of plates, one of said pair of plates being disposed in one of said pair of brake shoe slots and the other of said pair of plates being disposed in the other of said pair of brake shoe slots, an extensible member extending between the pair of plates and operatively engaging each plate to prevent rotation relative thereto and a retention spring engaging one of the plates and urging said pair of brake shoes together; said pair of brake shoes defining a radial width, and said resilient means normally being disposed entirely within said radial width and biasing said one pair of brake shoes to a non-braking position.
6. The drum brake of claim 5 in which a pawl is pivotally mounted on the other of the plates and the retention spring engages the pawl to urge the pawl into engagement with the extensible member.
7. The drum brake of claim 6 in which said pawl includes a V-shaped groove for receiving the other of the plates in order to pivotally mount said pawl on the other of said plates.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US78401077A | 1977-04-04 | 1977-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1075176A true CA1075176A (en) | 1980-04-08 |
Family
ID=25131080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA296,791A Expired CA1075176A (en) | 1977-04-04 | 1978-02-13 | Drum brake and mounting means therefor |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS53123774A (en) |
| AU (1) | AU519918B2 (en) |
| BR (1) | BR7801946A (en) |
| CA (1) | CA1075176A (en) |
| DE (1) | DE2812043A1 (en) |
| ES (1) | ES468428A1 (en) |
| FR (1) | FR2386733A1 (en) |
| GB (1) | GB1586054A (en) |
| IT (1) | IT1093971B (en) |
| MX (1) | MX144866A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5269396A (en) * | 1991-02-28 | 1993-12-14 | Jones Brake Technologies, Inc. | Brake assembly backing means |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0444849Y2 (en) * | 1985-05-14 | 1992-10-22 | ||
| AU641511B2 (en) * | 1990-06-22 | 1993-09-23 | Gordon Joseph Taylor | A brake mounting pin |
| AU652196B2 (en) * | 1990-11-12 | 1994-08-18 | Ross Allan Buttsworth | Heavy vehicle brake shoe aligner |
| US20080067020A1 (en) * | 2006-09-14 | 2008-03-20 | Akebono Corporation (North America) | Shoe to machined cast anchor interface for duo-servo drum brake |
| CN106523549B (en) * | 2016-12-12 | 2019-07-02 | 浙江亚太机电股份有限公司 | Self-boosting type drum brake with clearance self-regulating mechanism device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2770328A (en) * | 1950-06-27 | 1956-11-13 | Bendix Aviat Corp | Brake assembly |
| US3162273A (en) * | 1960-05-06 | 1964-12-22 | Bendix Corp | Lever actuated and anchored brake |
| FR1524216A (en) * | 1967-03-20 | 1968-05-10 | Teves Kg Alfred | Drum brake |
| US3540555A (en) * | 1969-01-23 | 1970-11-17 | Bendix Corp | Automatic brake adjuster mechanism |
-
1978
- 1978-02-13 CA CA296,791A patent/CA1075176A/en not_active Expired
- 1978-03-20 DE DE19782812043 patent/DE2812043A1/en not_active Withdrawn
- 1978-03-21 AU AU34384/78A patent/AU519918B2/en not_active Expired
- 1978-03-28 GB GB12077/78A patent/GB1586054A/en not_active Expired
- 1978-03-29 IT IT21712/78A patent/IT1093971B/en active
- 1978-03-30 BR BR7801946A patent/BR7801946A/en unknown
- 1978-03-31 ES ES468428A patent/ES468428A1/en not_active Expired
- 1978-03-31 MX MX172949A patent/MX144866A/en unknown
- 1978-04-03 JP JP3818778A patent/JPS53123774A/en active Pending
- 1978-04-04 FR FR7809890A patent/FR2386733A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5269396A (en) * | 1991-02-28 | 1993-12-14 | Jones Brake Technologies, Inc. | Brake assembly backing means |
Also Published As
| Publication number | Publication date |
|---|---|
| ES468428A1 (en) | 1978-12-16 |
| JPS53123774A (en) | 1978-10-28 |
| GB1586054A (en) | 1981-03-18 |
| MX144866A (en) | 1981-11-27 |
| IT1093971B (en) | 1985-07-26 |
| AU3438478A (en) | 1979-09-27 |
| DE2812043A1 (en) | 1978-10-12 |
| FR2386733B1 (en) | 1980-12-19 |
| IT7821712A0 (en) | 1978-03-29 |
| BR7801946A (en) | 1978-11-21 |
| FR2386733A1 (en) | 1978-11-03 |
| AU519918B2 (en) | 1982-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |