GB1402527A - Automatic adjuster for an internal shoe drum brake - Google Patents

Automatic adjuster for an internal shoe drum brake

Info

Publication number
GB1402527A
GB1402527A GB5434271A GB5434271A GB1402527A GB 1402527 A GB1402527 A GB 1402527A GB 5434271 A GB5434271 A GB 5434271A GB 5434271 A GB5434271 A GB 5434271A GB 1402527 A GB1402527 A GB 1402527A
Authority
GB
United Kingdom
Prior art keywords
lever
pawl
shoe
strut
ratchet wheel
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
Application number
GB5434271A
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.)
Girling Ltd
Original Assignee
Girling Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Girling Ltd filed Critical Girling Ltd
Priority to GB5434271A priority Critical patent/GB1402527A/en
Priority to DE19722257520 priority patent/DE2257520A1/en
Publication of GB1402527A publication Critical patent/GB1402527A/en
Expired legal-status Critical Current

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
    • F16D65/563—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

Abstract

1402527 Automatic adjusters; internal shoedrum brakes GIRLING Ltd 16 Nov 1972 [23 Nov 1971] 54342/71 Heading F2E An internal shoe-drum brake has an adjuster strut comprising male and female screw threaded parts 8, 9 arranged between leading and trailing shoes 2, the part 9 being formed with a ratchet wheel 10 rotatable by a pawl lever 11 to effect extension of the strut 8, 9 to compensate for wear of the brake shoe linings and the pawl tip 12 being formed with two (or more) pawl teeth 12A, 12B spaced apart generally circumferentially of the ratchet wheel 10 along an arc of a circle or on a straight line. As shown in Figs. 1, 3, the shoes 2 may be actuated by a double ended cylinder 5 against the action of shoe return springs 6, or mechanically by an actuating lever 4 pivoted to the trailing shoe 2 at a pivot pin 7 and acting on one end of the adjuster strut 8, 9. Upon service actuation by cylinder 5 the shoes 2 expand to relieve the strut 8, 9 of loading by return springs 6 to allow a spring 13 to pivot the pawl lever 11 so that if the shoe movement is excesive indicating that adjustment is necessary the total movement of the pawl tip 12 is sufficient to effect an increment of adjustment by turning the ratchet wheel 10. Mechanical (hand brake) actuation is effected by rotating lever 4 clockwise to force the tip of the trailing shoe 2 rightwards and the strut 8, 9 and leading shoe 2 leftwards by reaction. The return springs 6 continue to act on the strut parts and rotation of the ratchet wheel 10 is prevented. As seen in Fig. 4, the pawl lever 11 is made as a sheet metal pressing in the form of a bellcrank lever with a hole 17 to receive pivot pin 7. One arm includes pawl tip 12 which is bent at right angles to the remainder of the arm and the opposite arm has a flange 16 for attachment of spring 13 and has a pip 17 which forms a fulcrum point for rocking of the lever 11 about an axis generally parallel with the plane of the lever 11. The pitch of the pawl teeth 12A, 12B is slightly less than that of the ratchet wheel teeth.
GB5434271A 1971-11-23 1971-11-23 Automatic adjuster for an internal shoe drum brake Expired GB1402527A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB5434271A GB1402527A (en) 1971-11-23 1971-11-23 Automatic adjuster for an internal shoe drum brake
DE19722257520 DE2257520A1 (en) 1971-11-23 1972-11-23 AUTOMATIC ADJUSTMENT DEVICE FOR AN INNER JAW DRUM BRAKE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5434271A GB1402527A (en) 1971-11-23 1971-11-23 Automatic adjuster for an internal shoe drum brake

Publications (1)

Publication Number Publication Date
GB1402527A true GB1402527A (en) 1975-08-13

Family

ID=10470691

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5434271A Expired GB1402527A (en) 1971-11-23 1971-11-23 Automatic adjuster for an internal shoe drum brake

Country Status (2)

Country Link
DE (1) DE2257520A1 (en)
GB (1) GB1402527A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196795A (en) * 1977-08-20 1980-04-08 Tokico Ltd. Automatic brake shoe clearance adjusting device
US4222467A (en) * 1979-02-02 1980-09-16 The Bendix Corporation Drum brake adjuster
US4243125A (en) * 1979-09-21 1981-01-06 Chrysler Corporation Self-adjusting drum brake
EP0104102A1 (en) * 1982-08-23 1984-03-28 Allied Corporation Adjuster assembly for a nonservo drum brake
EP0171222A2 (en) * 1984-08-09 1986-02-12 LUCAS INDUSTRIES public limited company Internal shoe-drum brake
CN115076266A (en) * 2022-06-06 2022-09-20 南方天合底盘系统有限公司 Automobile drum brake and clearance calculation method thereof

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE398379B (en) * 1976-12-27 1977-12-19 Camph Sven Erik AUTOMATIC FOLLOW-UP DEVICE
DE2741472C3 (en) * 1977-09-15 1980-10-30 Adam Opel Ag, 6090 Ruesselsheim Return spring for the brake shoes of a drum brake
US4382494A (en) * 1979-12-20 1983-05-10 Lucas Industries Limited Adjuster strut for vehicle drum brake
US5000296A (en) * 1989-08-24 1991-03-19 General Motors Corporation Self-adjusting vehicle wheel drum brake with multiple pawl step
US5029676A (en) * 1989-09-25 1991-07-09 General Motors Corporation Drum brake self-adjuster mechanism

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196795A (en) * 1977-08-20 1980-04-08 Tokico Ltd. Automatic brake shoe clearance adjusting device
US4222467A (en) * 1979-02-02 1980-09-16 The Bendix Corporation Drum brake adjuster
US4243125A (en) * 1979-09-21 1981-01-06 Chrysler Corporation Self-adjusting drum brake
EP0104102A1 (en) * 1982-08-23 1984-03-28 Allied Corporation Adjuster assembly for a nonservo drum brake
US4502574A (en) * 1982-08-23 1985-03-05 The Bendix Corporation Adjuster assembly for a nonservo drum brake
EP0171222A2 (en) * 1984-08-09 1986-02-12 LUCAS INDUSTRIES public limited company Internal shoe-drum brake
EP0171222A3 (en) * 1984-08-09 1986-12-30 Lucas Industries Public Limited Company Internal shoe-drum brake
CN115076266A (en) * 2022-06-06 2022-09-20 南方天合底盘系统有限公司 Automobile drum brake and clearance calculation method thereof
CN115076266B (en) * 2022-06-06 2024-01-30 南方天合底盘系统有限公司 Automobile drum brake and clearance calculation method thereof

Also Published As

Publication number Publication date
DE2257520A1 (en) 1973-05-30

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee