US3554330A - Drum brakes - Google Patents
Drum brakes Download PDFInfo
- Publication number
- US3554330A US3554330A US803142*A US3554330DA US3554330A US 3554330 A US3554330 A US 3554330A US 3554330D A US3554330D A US 3554330DA US 3554330 A US3554330 A US 3554330A
- Authority
- US
- United States
- Prior art keywords
- back plate
- brake
- shoes
- spring
- aperture
- 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 - Lifetime
Links
Images
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
- F16D65/02—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
- F16D65/09—Pivots or supporting members therefor
- F16D65/091—Pivots or supporting members therefor for axially holding the segments
-
- 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
- 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
- F16D65/563—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 adjacent to service brake actuator, e.g. on parking brake lever, and not subjected to service brake force
Definitions
- ABSTRACT In an internal shoe drum brake in which a pair of shoes each have one end in sliding engagement with an abutment surface fast to a back plate, and brake-actuating means [54] Figs carried by the back plate operate to force apart the other ends of the two shoes, a single spring serves both to return the shoes [52] US. Cl 188/78, towards one another (holding them pressed against th b 183/216 ment surfaces in the brakes-off condition) and also to hold [51] Int.
- a spring of generally C 216 form operates to urge towards one another a pair of coupling members, each of which is anchored at one end to the back [56] References C'ted plate, and extends through an aperture in the web of one of UNITED STATES PATENTS the shoes, a portion of the coupling member which is inclined 2,509,643 5/1950 House 188/78(.9) to the plane of the back plate making sliding engagement with 3,061,051 /1962 Swift- 188/78( .9) the margin of the aperture.
- an internal shoe drum brake including a back plate extending substantially perpendicular to the axis of the brake drum, a pair of opposed brake shoes disposed adjacent one face of the back plate, one end of each shoe having engagement with an abutment surface fast to the back plate, and, a brake return spring acting on the two .shoes to urge'them towards each other, wherein the end of the spring is coupled to the respective shoes each by means of a coupling member which coacts with the back plate and the respective brake shoe to urge the brake shoe towards the said face of the back plate.
- FIG. 1 is a side elevation of the brake
- FIG. 2 is a section on the line B B of FIG. 1;
- FIG. 3 is a section on the lineA A of FIG. 1;
- FIGS. 4 and 5 are a scrap section and perspective view, respectively illustrating constructional details.
- the brake shown in the drawings comprises a back plate 1 carrying a double ended hydraulic actuator or slave cylinder-2 and a double-ended abutment 3.
- 'A pair of shoes 4T and 4L each have their opposite endsor tips engagingthe actuator and abutment respectively, and are urged inwardly (towards each other) by a generally C-shaped cantilever spring 6.
- each arm of the spring 6 is coupled to the adjacent shoe by means of a clip 7, the form of which is best seen in FIGS. 2, 4 arid 5
- a clip 7 the form of which is best seen in FIGS. 2, 4 arid 5
- One end of the coupling member or clip extends through an opening 8 through the web 9 of the shoeand is-forrned with an-open loop which engages around the spring. Adjacent the loop, the portion 11 of the clip which extends through the opening 8 is inclined to the plane of the web.
- the other end portion of the clip is formed with a heel. portion l2 engagingone edge of an aperture 13 in the back plate, and a toe portion 14 engaging under the back plate, thus anchoring the coupling member to the back plate.
- shoe return load is equal to WR.
- shoe return and holddown forces obtained can be determined by selection of the force Ws and the shaping of the clip -7, particularly the inclined portion 11 thereof. It will be noted that the heel and toe of the clip tend to be self sealinga'gainst the adjacent edges shoe-web window having a wear resistant slipper plate-26.
- The- I spindle 22 also extends through an eye at oneend of a strut 27:
- the outer end of the spindle 31 is forked and engages in a notch in the adjacent shoe web.
- the lower end of the spindle 22 is supported in a spring clipv 32 which permits articulating movement of the spindle, and also spring biases the upper end of the spindle towards the back plate 1.
- the spring clip 32 extends longitudinally of the spindle and engages the upper end thereof, to provide the last-mentioned spring bias.
- the upper end of the spring clip 32 also provides axial location for a roller 24, which rotates on the spindle and engages the back plate to facilitate rocking movement of the spindle about its lower end, in a plane substantially parallel with that of the back plate.
- the lever 21 is rotated (by means of a handbrake or other mechanical auxiliary mechanism) in a clockwise direction (as seen in FIG. 2) with the spindle 22.
- the finger 23 presses the shoe 4T to the right, and the reaction is transferred by the spindle 22 to the strut 27 and so to the shoe 4L, to expand the shoes against the action of the return spring 6.
- the brake is provided with an automatic adjustment device for compensating for wear of the shoe friction linings.
- This device includes the strut 27 previously described, and operates to increase the effective length of the strut when wear compensating adjustment is required, by rotating the nut 29 in response to excess movement of the shoes upon brake actuation.
- This is effected by means of a pawl 30 forming one arm of a bellcrank lever, pivotally mounted on the spindle 22.
- the other arm-34 of the bell crank is secured to a cantilever spring 33, the free end of which bears against the web of the shoe 4L and also against the adjacent portion of the spindle 31.
- the spring is strained was to apply to the bell crank a force tending to rotate it clockwise as viewed in FIG. 2 and also to urge the free end of the pawl arm into engagement with the ratchet teeth formed on the nut 29.
- the strut 27 In the brakes-off condition, the strut 27 is loaded by the return spring 6, and the resultant friction between the relatively-rotatable parts of the strut is sufficient to prevent the nut 28- rotating under the action of cantilever spring 33.
- the strut On mechani cal actuation, the strut remains loaded, but when the service brake is actuated, the slave cylinder 2 expands the shoes, relieving the strut of load, so that if adjustment is required, the pawl can pick up'another ratchet tooth and rotatethe nut 28', and in this way, progressive wear of the friction linings is compensated as required, byrepeated operation. of the service brake, and the lost motion in the auxiliary brake, resulting from lining wear, is kept within acceptable, predetermined". limits. Adjustment'of the strut length byQthe pawl'and ratchet mechanism may, of course, be effected during-the actuating] stroke of the brake mechanism or the i return stroke.
- said coupling means being constructed and arranged to coactwithsaid shoes and -withsaid back plate to transmit'thereto a force frorn-said spring urging said shoes against said surfaceof said backplatta.
- coupling means comprising acoupling member. having-;one:
- a second portion-- brake shoes has a web formed with an aperture, said coupling element extending through said aperture and said inclined portion engaging an edge of said aperture.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB00208/68A GB1220992A (en) | 1968-03-01 | 1968-03-01 | Improvements in or relating to drum brakes |
Publications (1)
Publication Number | Publication Date |
---|---|
US3554330A true US3554330A (en) | 1971-01-12 |
Family
ID=9963588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US803142*A Expired - Lifetime US3554330A (en) | 1968-03-01 | 1969-02-28 | Drum brakes |
Country Status (9)
Country | Link |
---|---|
US (1) | US3554330A (ja) |
JP (1) | JPS491346B1 (ja) |
DE (1) | DE1909413C3 (ja) |
ES (1) | ES364277A1 (ja) |
FR (1) | FR2003073A1 (ja) |
GB (1) | GB1220992A (ja) |
PL (1) | PL79965B1 (ja) |
SE (1) | SE347327B (ja) |
SU (1) | SU390733A3 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3998303A (en) * | 1976-02-23 | 1976-12-21 | General Motors Corporation | Shoe hold down retainer for drum brakes |
US4887698A (en) * | 1987-08-27 | 1989-12-19 | Lucas Industries Public Limited Company | Brake actuator |
US20160273598A1 (en) * | 2013-12-09 | 2016-09-22 | Christophe Dupas | Drum brake provided with a member for holding a brake segment |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS589296B2 (ja) * | 1976-09-09 | 1983-02-19 | 日産自動車株式会社 | 内部拡張式ドラムブレ−キのシユ−間隙自動調整装置 |
USRE31378E (en) | 1977-04-28 | 1983-09-13 | The Bendix Corporation | Drum brake adjuster |
US4101011A (en) * | 1977-04-28 | 1978-07-18 | The Bendix Corporation | Drum brake adjuster |
DE9300423U1 (de) * | 1993-01-14 | 1994-05-19 | Lucas Industries P.L.C., Birmingham, West Midlands | Niederhaltevorrichtung für eine Bremsbacke einer Trommelbremse |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2509643A (en) * | 1944-01-20 | 1950-05-30 | Bendix Aviat Corp | Brake |
US3061051A (en) * | 1961-04-12 | 1962-10-30 | Kelsey Hayes Co | Brake assembly |
US3203512A (en) * | 1962-02-13 | 1965-08-31 | Ferodo Sa | Hydraulic drum brake |
FR1438924A (fr) * | 1965-07-06 | 1966-05-13 | Girling Ltd | Frein à tambour à patins intérieurs |
US3337007A (en) * | 1962-05-16 | 1967-08-22 | Kelsey Hayes Co | Brake shoe retainer |
-
1968
- 1968-03-01 GB GB00208/68A patent/GB1220992A/en not_active Expired
-
1969
- 1969-02-25 DE DE1909413A patent/DE1909413C3/de not_active Expired
- 1969-02-27 SU SU1306642A patent/SU390733A3/ru active
- 1969-02-28 SE SE02821/69A patent/SE347327B/xx unknown
- 1969-02-28 PL PL1969132035A patent/PL79965B1/pl unknown
- 1969-02-28 US US803142*A patent/US3554330A/en not_active Expired - Lifetime
- 1969-03-01 ES ES364277A patent/ES364277A1/es not_active Expired
- 1969-03-01 JP JP44015310A patent/JPS491346B1/ja active Pending
- 1969-03-03 FR FR6905694A patent/FR2003073A1/fr not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2509643A (en) * | 1944-01-20 | 1950-05-30 | Bendix Aviat Corp | Brake |
US3061051A (en) * | 1961-04-12 | 1962-10-30 | Kelsey Hayes Co | Brake assembly |
US3203512A (en) * | 1962-02-13 | 1965-08-31 | Ferodo Sa | Hydraulic drum brake |
US3337007A (en) * | 1962-05-16 | 1967-08-22 | Kelsey Hayes Co | Brake shoe retainer |
FR1438924A (fr) * | 1965-07-06 | 1966-05-13 | Girling Ltd | Frein à tambour à patins intérieurs |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3998303A (en) * | 1976-02-23 | 1976-12-21 | General Motors Corporation | Shoe hold down retainer for drum brakes |
US4887698A (en) * | 1987-08-27 | 1989-12-19 | Lucas Industries Public Limited Company | Brake actuator |
US20160273598A1 (en) * | 2013-12-09 | 2016-09-22 | Christophe Dupas | Drum brake provided with a member for holding a brake segment |
US10774888B2 (en) * | 2013-12-09 | 2020-09-15 | Chassis Brakes International B.V. | Drum brake provided with a member for holding a brake segment |
Also Published As
Publication number | Publication date |
---|---|
SU390733A3 (ja) | 1973-07-11 |
DE1909413A1 (de) | 1969-09-11 |
GB1220992A (en) | 1971-01-27 |
DE1909413B2 (de) | 1978-06-29 |
PL79965B1 (ja) | 1975-08-30 |
ES364277A1 (es) | 1971-02-16 |
JPS491346B1 (ja) | 1974-01-12 |
FR2003073A1 (ja) | 1969-11-07 |
SE347327B (ja) | 1972-07-31 |
DE1909413C3 (de) | 1979-02-15 |
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