US20010011619A1 - Parking brake - Google Patents
Parking brake Download PDFInfo
- Publication number
- US20010011619A1 US20010011619A1 US08/899,509 US89950997A US2001011619A1 US 20010011619 A1 US20010011619 A1 US 20010011619A1 US 89950997 A US89950997 A US 89950997A US 2001011619 A1 US2001011619 A1 US 2001011619A1
- Authority
- US
- United States
- Prior art keywords
- parking brake
- brake according
- recesses
- drum
- cylindrical surface
- 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
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
- F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
- F16D63/004—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00 comprising a rotor engaged both axially and radially by braking members, e.g. combined drum and disc 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
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/004—Profiled friction surfaces, e.g. grooves, dimples
Definitions
- the present invention relates to a parking brake for vehicles, of the type that comprises a drum and at least one shoe intended to press against a cylindrical surface formed on the inside of the drum.
- each disc brake with a drum-type parking brake comprising a drum and at least one shoe intended to be pressed against said drum when the so-called handbrake is operated.
- the starting point of the present invention is the problem of devising a parking brake whose structural and functional characteristics are such as to overcome the abovementioned disadvantages.
- a parking brake of the specified type which is characterized by the fact that it comprises surface irregularities formed in the cylindrical surface.
- FIG. 1 shows a sectional view of a part of a vehicle incorporating the parking brake according to the invention
- FIG. 2 shows an end view of the same portion of the vehicle as in FIG. 1,
- FIG. 3 shows a perspective view with partial section of a component of the parking brake according to the present invention.
- FIG. 4 shows a perspective view, much enlarged, of a detail of the component of FIG. 3.
- the numeral 1 is a general reference for part of a vehicle, for example an industrial vehicle, a truck, a car, or the like, comprising a rear axle 2 with axis X-X, and a hub 3 for a rear wheel, the hub being rotatably supported by the axle 2 on bearings 4 and rotated by a shaft 5 .
- 6 is a disc brake, in itself conventional, of which the drawing shows only a braking annulus 7 of its disc 8 .
- 9 is a parking brake according to the invention.
- the parking brake 9 comprises a drum 10 that is bolted 10 a to the hub 3 , and two shoes 11 mounted on the axle 2 and intended to press when operated by control means known per se against a cylindrical surface 12 formed on the inside of the drum 10 .
- surface irregularities 13 basically irregularities of shape, which take the form of a plurality of recesses 14 and a plurality of projections 15 , both 14 and 15 extending along generatrices of the cylindrical surface 12 .
- the recesses 14 and the projections 15 alternate with each other and are distributed at a regular pitch.
- the pitch indicated in the figure by p, is equal to 1 mm.
- the recesses 14 are essentially equilateral triangles in cross-section, with convex sides and a rounded vertex.
- the recesses 14 have a defined limited depth, indicated in the figure by h, of between 0.03 mm and 0.08 mm.
- the projections 15 have a basically flat peak belonging to the cylindrical surface 12 .
- the recesses are preferably produced by the action of a knurling tool on the cylindrical surface 12 .
- the knurling operation is rapidly performed on the cylindrical surface 12 , subsequent to its being finished-turned.
- the drum comprises an annular portion 16 formed integrally on the outside and serving as the braking annulus 7 of the disc brake 6 .
- the parking brake in accordance with the present invention performs at maximum efficiency from the first time it is operated, without requiring preparatory running-in or the preliminary application of expensive coatings.
- Another advantage of the parking brake according to the present invention is the simplicity of its manufacture, which is not the least advantage for an item intended to be mass-produced and which must give long and reliable service.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
Description
- The present invention relates to a parking brake for vehicles, of the type that comprises a drum and at least one shoe intended to press against a cylindrical surface formed on the inside of the drum.
- In vehicles fitted with disc brakes on the rear wheels, it is part of the prior art to provide each disc brake with a drum-type parking brake comprising a drum and at least one shoe intended to be pressed against said drum when the so-called handbrake is operated.
- It is also known that in order to ensure that the user can park the vehicle satisfactorily, even on the very first occasion on which the handbrake is operated, the brake has to be “worn in” at the time of manufacture of the vehicle by putting the vehicle, which may in particular be an industrial vehicle, truck or the like, through repeated braking cycles, i.e. a specific wearing-in of the brake. This procedure obviously adds to the cost.
- It has been suggested that the cylindrical surface formed on the inside of the drum be coated with a layer of chromium. This solution enables the wearing-in process to be dispensed with but is unattractive from a cost point of view because it means extra work at the drum processing stage, the drum having to undergo a complex and expensive extra process owing in part to the necessity of protecting with suitable coatings those parts of the component that are not to be chrome-plated.
- The starting point of the present invention is the problem of devising a parking brake whose structural and functional characteristics are such as to overcome the abovementioned disadvantages.
- This problem is solved by a parking brake of the specified type, which is characterized by the fact that it comprises surface irregularities formed in the cylindrical surface.
- Further characteristics and advantages of the parking brake according to the present invention will emerge from the description given below of an example of an embodiment thereof, provided by way of non-restrictive indication, with reference to the accompanying figures, in which:
- FIG. 1 shows a sectional view of a part of a vehicle incorporating the parking brake according to the invention,
- FIG. 2 shows an end view of the same portion of the vehicle as in FIG. 1,
- FIG. 3 shows a perspective view with partial section of a component of the parking brake according to the present invention, and
- FIG. 4 shows a perspective view, much enlarged, of a detail of the component of FIG. 3.
- With reference to the accompanying figures, the numeral1 is a general reference for part of a vehicle, for example an industrial vehicle, a truck, a car, or the like, comprising a
rear axle 2 with axis X-X, and ahub 3 for a rear wheel, the hub being rotatably supported by theaxle 2 on bearings 4 and rotated by ashaft 5. 6 is a disc brake, in itself conventional, of which the drawing shows only abraking annulus 7 of itsdisc 8. 9 is a parking brake according to the invention. - The parking brake9 comprises a
drum 10 that is bolted 10 a to thehub 3, and twoshoes 11 mounted on theaxle 2 and intended to press when operated by control means known per se against acylindrical surface 12 formed on the inside of thedrum 10. - Formed on the
cylindrical surface 12 aresurface irregularities 13, basically irregularities of shape, which take the form of a plurality ofrecesses 14 and a plurality of projections 15, both 14 and 15 extending along generatrices of thecylindrical surface 12. Therecesses 14 and the projections 15 alternate with each other and are distributed at a regular pitch. In the example, the pitch, indicated in the figure by p, is equal to 1 mm. Therecesses 14 are essentially equilateral triangles in cross-section, with convex sides and a rounded vertex. - The
recesses 14 have a defined limited depth, indicated in the figure by h, of between 0.03 mm and 0.08 mm. The projections 15 have a basically flat peak belonging to thecylindrical surface 12. - The recesses are preferably produced by the action of a knurling tool on the
cylindrical surface 12. The knurling operation is rapidly performed on thecylindrical surface 12, subsequent to its being finished-turned. - The drum comprises an annular portion16 formed integrally on the outside and serving as the
braking annulus 7 of thedisc brake 6. - In operation, when the parking brake is used for the first time, the shoes come into contact with the internal surface where they meet the surface irregularities that have been formed upon the latter. An immediate bedding-in takes place between the shoes and the internal surface.
- It has been found that by virtue of this bedding-in, the parking brake in accordance with the present invention performs at maximum efficiency from the first time it is operated, without requiring preparatory running-in or the preliminary application of expensive coatings.
- Another advantage of the parking brake according to the present invention is the simplicity of its manufacture, which is not the least advantage for an item intended to be mass-produced and which must give long and reliable service.
- Clearly, a person skilled in the art will be able, in order to satisfy individual and particular needs, to modify and vary the above-described parking brake in numerous ways, all however remaining within the scope of protection of the invention as defined by the following claims.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI96A001691 | 1996-08-02 | ||
IT96MI001691A IT1283674B1 (en) | 1996-08-02 | 1996-08-02 | PARKING BRAKE |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010011619A1 true US20010011619A1 (en) | 2001-08-09 |
US6415894B2 US6415894B2 (en) | 2002-07-09 |
Family
ID=11374761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/899,509 Expired - Lifetime US6415894B2 (en) | 1996-08-02 | 1997-07-24 | Parking brake |
Country Status (6)
Country | Link |
---|---|
US (1) | US6415894B2 (en) |
EP (1) | EP0833070B1 (en) |
JP (2) | JPH10119738A (en) |
DE (1) | DE69732682T2 (en) |
ES (1) | ES2239345T3 (en) |
IT (1) | IT1283674B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120235463A1 (en) * | 2009-12-11 | 2012-09-20 | Renault Trucks | Driven wheel assembly and automotive vehicle equipped with such an assembly |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1283674B1 (en) * | 1996-08-02 | 1998-04-23 | Freni Brembo Spa | PARKING BRAKE |
US20080217116A1 (en) * | 2005-10-28 | 2008-09-11 | Brembo Ceramic Systems S.P.A. | Parking Brake |
US20100083780A1 (en) * | 2008-10-03 | 2010-04-08 | Joseph Szuba | One piece ring gear-park brake drum |
IT201700021875A1 (en) * | 2017-02-27 | 2018-08-27 | Freni Brembo Spa | DISC BRAKE DISC WITH CYLINDRICAL PARKING BRAKE SURFACE |
EP3382227B1 (en) * | 2017-03-28 | 2019-11-27 | FCA Italy S.p.A. | Brake disc |
FR3065250B1 (en) * | 2017-04-14 | 2019-07-05 | Somfy Sas | METHODS OF MANUFACTURING A DRUM AND SPRING BRAKE OF AN ELECTROMECHANICAL ACTUATOR, ELECTROMECHANICAL ACTUATOR AND DOMOTIC INSTALLATION |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1818100A (en) * | 1927-11-28 | 1931-08-11 | Benjamin F Shields | Friction brake |
US1846816A (en) * | 1930-09-25 | 1932-02-23 | John S Skelly | Brake drum |
US2126945A (en) * | 1930-12-31 | 1938-08-16 | Caleb S Bragg | Brake drum |
US1978563A (en) * | 1932-06-07 | 1934-10-30 | Caleb S Bragg | Brake drum |
CH203755A (en) * | 1938-07-11 | 1939-03-31 | Fischer Ag Georg | One-piece braking element designed as a round body. |
US2516544A (en) * | 1948-01-10 | 1950-07-25 | Charles A Breeze | Friction clutch |
US2702613A (en) * | 1950-08-07 | 1955-02-22 | Dayton Steel Foundry Co | Brake drum construction |
US2978073A (en) * | 1957-04-01 | 1961-04-04 | Chicago Railway Equipment Co | Bimetal brake drum |
US3007553A (en) * | 1958-05-19 | 1961-11-07 | Keisey Hayes Company | Brake drum |
US3066766A (en) * | 1961-04-04 | 1962-12-04 | Robert N Minor | Quick change brake lining |
FR1337353A (en) * | 1962-07-24 | 1963-09-13 | Device increasing the efficiency of the brakes on all vehicles or on all fixed braking systems | |
US3347345A (en) * | 1966-03-01 | 1967-10-17 | Caterpillar Tractor Co | Brake lining and cooling means |
GB1415193A (en) * | 1972-03-23 | 1975-11-26 | Girling Ltd | Disc brakes |
US4385429A (en) * | 1979-07-18 | 1983-05-31 | Dynetics, Inc. | Method of manufacturing a clutch plate |
JPS57192636A (en) * | 1981-05-23 | 1982-11-26 | Hosei Brake Kogyo Kk | Brake drum for parking brake |
JPS58149427A (en) * | 1982-03-02 | 1983-09-05 | Nissan Motor Co Ltd | Drum brake |
US4674606A (en) * | 1986-02-27 | 1987-06-23 | Lynn Denton | Cooling and drying fins for brake drums and flywheels |
US5246093A (en) * | 1989-04-12 | 1993-09-21 | Brake & Clutch Industries Australia Pty. Ltd. | Drum brake assembly |
US5238091A (en) * | 1990-09-29 | 1993-08-24 | Aisin Kako Kabushiki Kaisha | Brake band for automatic transmission |
US5352305A (en) * | 1991-10-16 | 1994-10-04 | Dayton Walther Corporation | Prestressed brake drum or rotor |
CA2079060A1 (en) * | 1991-10-16 | 1993-04-17 | K-H Corporation | Prestressed brake drum or rotor |
US5816901A (en) * | 1993-04-09 | 1998-10-06 | Sirany; Dallas R. | Method of resurfacing a vehicles's braking rotors and drums |
US5385216A (en) * | 1993-06-04 | 1995-01-31 | The Budd Company | Composite rear brake disc and drum |
KR960010658Y1 (en) * | 1994-05-12 | 1996-12-23 | 송재휴 | Center brake |
IT1283674B1 (en) * | 1996-08-02 | 1998-04-23 | Freni Brembo Spa | PARKING BRAKE |
-
1996
- 1996-08-02 IT IT96MI001691A patent/IT1283674B1/en active IP Right Grant
-
1997
- 1997-07-22 DE DE69732682T patent/DE69732682T2/en not_active Expired - Lifetime
- 1997-07-22 ES ES97202286T patent/ES2239345T3/en not_active Expired - Lifetime
- 1997-07-22 EP EP97202286A patent/EP0833070B1/en not_active Expired - Lifetime
- 1997-07-24 US US08/899,509 patent/US6415894B2/en not_active Expired - Lifetime
- 1997-08-04 JP JP9209256A patent/JPH10119738A/en active Pending
-
2008
- 2008-04-01 JP JP2008095295A patent/JP2008170013A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120235463A1 (en) * | 2009-12-11 | 2012-09-20 | Renault Trucks | Driven wheel assembly and automotive vehicle equipped with such an assembly |
US8974008B2 (en) * | 2009-12-11 | 2015-03-10 | Renault Trucks | Driven wheel assembly and automotive vehicle equipped with such an assembly |
Also Published As
Publication number | Publication date |
---|---|
JP2008170013A (en) | 2008-07-24 |
EP0833070A1 (en) | 1998-04-01 |
ITMI961691A1 (en) | 1998-02-02 |
DE69732682D1 (en) | 2005-04-14 |
DE69732682T2 (en) | 2005-12-29 |
EP0833070B1 (en) | 2005-03-09 |
US6415894B2 (en) | 2002-07-09 |
ITMI961691A0 (en) | 1996-08-02 |
IT1283674B1 (en) | 1998-04-23 |
ES2239345T3 (en) | 2005-09-16 |
JPH10119738A (en) | 1998-05-12 |
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Owner name: FRENI BREMBO S.P.A., ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GIORGETTI, ALBERTO;BRAIATO, ANTONIO;REEL/FRAME:009048/0880 Effective date: 19970728 |
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