GB2240596A - A brake drum - Google Patents

A brake drum Download PDF

Info

Publication number
GB2240596A
GB2240596A GB9002340A GB9002340A GB2240596A GB 2240596 A GB2240596 A GB 2240596A GB 9002340 A GB9002340 A GB 9002340A GB 9002340 A GB9002340 A GB 9002340A GB 2240596 A GB2240596 A GB 2240596A
Authority
GB
United Kingdom
Prior art keywords
brake drum
end wall
recesses
shell
extending
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.)
Granted
Application number
GB9002340A
Other versions
GB9002340D0 (en
GB2240596B (en
Inventor
Giovanni Crisa
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.)
WOODSTOCK ENGINEERING Ltd
Automotive Products PLC
Original Assignee
WOODSTOCK ENGINEERING Ltd
Automotive Products PLC
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 WOODSTOCK ENGINEERING Ltd, Automotive Products PLC filed Critical WOODSTOCK ENGINEERING Ltd
Priority to GB9002340A priority Critical patent/GB2240596B/en
Publication of GB9002340D0 publication Critical patent/GB9002340D0/en
Publication of GB2240596A publication Critical patent/GB2240596A/en
Application granted granted Critical
Publication of GB2240596B publication Critical patent/GB2240596B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F16D65/78—Features relating to cooling
    • F16D65/82—Features relating to cooling for internally-engaging brakes
    • F16D65/827—Features relating to cooling for internally-engaging brakes with open cooling system, e.g. cooled by air
    • 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
    • F16D65/10—Drums for externally- or 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
    • F16D65/02—Braking members; Mounting thereof
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/1304—Structure
    • F16D2065/1332—Structure external ribs, e.g. for cooling or reinforcement

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

A brake drum 10 comprises a cylindrical shell 12 and an end wall 18. The end wall 18 has a plurality of radially extending grooves 28 in its outer surface which form air passageways when the drum is attached to a wheel hub, such that air flows outwardly along the passageways by the centrifugal effect as the wheel rotates. The shell 12 has a plurality of extending fins 50 on its outer surface to enhance cooling. <IMAGE>

Description

A BRAKE DRUM The present invention relates to a brake drum and in particular to a brake drum which is designed to improve air cooling thereof.
The present invention provides a brake drum comprising an end wall for connection to a wheel hub) and a cylindrical shell, the end wall having a plurality of radially extending recesses therein such that, in use, air can pass radially along the recesses, the cylindrical shell having a plurality of axially extending fins on its outer surface.
A preferred embodiment of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Fig 1 is an end elevation of a brake drum according to the invention; Fig 2 is an enlarged sectional view along the line Il-I I of Fig 1; Fig 3 is an enlarged sectional view along part of the line III-III of Fig 1; and Fig 4 is a sectional view of the brake drum of Fig 1 attached to a wheel.
Referring to the drawings, a brake drum 1(3 comprises a cylindrical shell 12 and has an open end 14 and a closed end 16. At the closed end 16 is an end wall 18.
The end wall 18 comprises an outer annular portion 2(3 connected to the shell 12 and an inner annular portion 22. The inner annular portion 22 is nearer the open end 14 than the outer annular portion 2(3 and the two annular portions are joined by a frustro-conical portion 24. The inner annular portion 22 is thicker than the frustro-conical portion 24 and extends axially towards the closed end 16 to form an annular raised flange 26. The raised flange 26 has five radial recesses in the form of grooves 28 extending from its inner edge to its outer edge. The grooves shown are rectangular in cross section.The inner annular portion 22 has five holes 3(3 symmetrically spaced between the grooves 28, and two countersunk holes 32 which are on opposite sides of the brake drum, each being between one of the holes 3(3 and one of the grooves 28. Extending from the outer edge 31 of the inner annular portion 22 towards the open end 14 of the brake drum 1(3 is an annular ridge 34 having an inner edge 36 which is parallel to the axis of the drum and an outer edge 38 which tapers inwardly towards the open end of the brake drum such that the base 4(3 of the annular ridge 34 is wider than its peak 42.The inner edge 44 of the inner annular portion 22 defines a central bore 46 through the brake drum having one half 45, nearest the closed end of the brake drum, which is cylindrical, and another half 47 nearest the open end of the brake drum, which flares radially outwardly towards the open end of the brake drum. Extending radially outwardly fro the outer surface 48 of the shell 12 is a rim 49 having a plurality of fins 5(3 extending axially therefrom towards the closed end of the brake drum. The rim 49 is about a third of the way along the shell 12 from the open end of the drum and the fins 5(3 extend axially to a point about two thirds of the way along the shell 12 from the open end of the drum.
Fig 4 shows the brake drum 1(3 attached to a wheel 52.
The brake drum 18 is attached to a hub 54 such that the raised flange 26 abuts the wheel 52. The grooves 28 form air passageways 56 between the drum and the wheel.
A hub cap 58 is fitted to the wheel and covers the hub 54. Brake shoes 6(3 are arranged for contacting with the shell 12. As the wheel rotates air in the grooves 28 flows radially outwardly due to the centrifugal effect. This sets up a current of air, as shown by the arrows in Fig 4, which flows under the hub cap 58 at its outer edge, in towards the hub 54 and into the inner ends of the air passageways, out along the air passageways and on out between the end wall 14 of the brake drum d the wheel. This flow of air cools the drum. Cooling of the shell 12 of the drum is enhanced by the fins 5(3 which have a large surface area and can dissipate heat rapidly into the air current as it passes over them. The flow of the current of air past the hub 54 can help to cool the hub.

Claims (7)

1) A brake drum comprising an end wall for connection to a wheel hub and a cylindrical shell, the end wall having a plurality of radially extending recesses therein such that, in use, air can pass radially along the recesses, the cylindrical shell having a plurality of axially extending fins on its outer surface.
2) A brake drum according to claim 1 wherein the end wall has an outer surface for contacting a wheel hub and the recesses are grooves in the outer surface of the end wall.
3) A brake drum according to claim 2, the outer surface of the end wall having an annular part, the recesses extending from an inner edge to an outer edge of the annular part.
4) A brake drum according to claim 3 wherein the annular part of the outer surface is the surface of a raised flange.
5) A brake drum according to any foregoing claim, the shell having a radially protruding circumferential ridge on it outer surface.
6) A brake drum according to claim 5, the fins extending axially from the ridge.
7) A brake drum substantially as hereinbefore described with reference to the accompanying drawings.
GB9002340A 1990-02-02 1990-02-02 A drum brake Expired - Fee Related GB2240596B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9002340A GB2240596B (en) 1990-02-02 1990-02-02 A drum brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9002340A GB2240596B (en) 1990-02-02 1990-02-02 A drum brake

Publications (3)

Publication Number Publication Date
GB9002340D0 GB9002340D0 (en) 1990-04-04
GB2240596A true GB2240596A (en) 1991-08-07
GB2240596B GB2240596B (en) 1993-09-22

Family

ID=10670310

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9002340A Expired - Fee Related GB2240596B (en) 1990-02-02 1990-02-02 A drum brake

Country Status (1)

Country Link
GB (1) GB2240596B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103511513A (en) * 2013-10-16 2014-01-15 湖南中联重科车桥有限公司 brake drum, drum brake structure and vehicle
CN109681552A (en) * 2018-12-30 2019-04-26 河北百龙汽车配件制造有限公司 A kind of brake drum with automatic removing dust

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB364959A (en) * 1931-04-02 1932-01-14 Bendix Brake Co Improvements in or relating to wheels
GB572202A (en) * 1943-06-12 1945-09-27 James Henry Pratt Improvements in or relating to vehicle brakes
GB775237A (en) * 1954-06-07 1957-05-22 Bendix Aviat Corp Brake rotor for a combined disk and internal shoe-drum brake
GB969988A (en) * 1962-05-24 1964-09-16 Kaiser Aluminium Chem Corp Improvements in or relating to vehicle wheels
GB1455154A (en) * 1972-12-08 1976-11-10 Skf Nova Ab Wheel hub and bearing assembly microwave transmission line and devices using multiple coplanar conductors
EP0074624A2 (en) * 1981-09-15 1983-03-23 Georg Fischer Aktiengesellschaft Hub for vehicle wheels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB364959A (en) * 1931-04-02 1932-01-14 Bendix Brake Co Improvements in or relating to wheels
GB572202A (en) * 1943-06-12 1945-09-27 James Henry Pratt Improvements in or relating to vehicle brakes
GB775237A (en) * 1954-06-07 1957-05-22 Bendix Aviat Corp Brake rotor for a combined disk and internal shoe-drum brake
GB969988A (en) * 1962-05-24 1964-09-16 Kaiser Aluminium Chem Corp Improvements in or relating to vehicle wheels
GB1455154A (en) * 1972-12-08 1976-11-10 Skf Nova Ab Wheel hub and bearing assembly microwave transmission line and devices using multiple coplanar conductors
EP0074624A2 (en) * 1981-09-15 1983-03-23 Georg Fischer Aktiengesellschaft Hub for vehicle wheels

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103511513A (en) * 2013-10-16 2014-01-15 湖南中联重科车桥有限公司 brake drum, drum brake structure and vehicle
CN103511513B (en) * 2013-10-16 2016-05-25 湖南中联重科车桥有限公司 drum brake structure and vehicle
CN109681552A (en) * 2018-12-30 2019-04-26 河北百龙汽车配件制造有限公司 A kind of brake drum with automatic removing dust
CN109681552B (en) * 2018-12-30 2021-07-23 河北百龙汽车配件股份有限公司 Brake drum with automatic ash discharging function

Also Published As

Publication number Publication date
GB9002340D0 (en) 1990-04-04
GB2240596B (en) 1993-09-22

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Legal Events

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

Effective date: 19950202