SE437863B - AUTOMATIC FRICTION COVER ADJUSTMENT DEVICE - Google Patents
AUTOMATIC FRICTION COVER ADJUSTMENT DEVICEInfo
- Publication number
- SE437863B SE437863B SE7907785A SE7907785A SE437863B SE 437863 B SE437863 B SE 437863B SE 7907785 A SE7907785 A SE 7907785A SE 7907785 A SE7907785 A SE 7907785A SE 437863 B SE437863 B SE 437863B
- Authority
- SE
- Sweden
- Prior art keywords
- friction
- piston
- bore
- guide pin
- diameter
- Prior art date
Links
- 239000013013 elastic material Substances 0.000 claims description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims 1
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010959 steel Substances 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
- 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
- F16D65/54—Slack adjusters mechanical self-acting in one direction for adjusting excessive play by means of direct linear adjustment
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Description
7907785-5 Ändamålet med föreliggande uppfinning är att åstadkomma en automatisk inställningsanordning för friktionsbelägg som eliminerar de ovan beskrivna nackdelama och som ger som resultat ett lämpligt utförande ur tillverknings- och monteringssynpunkt . The object of the present invention is to provide an automatic adjustment device for friction pads which eliminates the disadvantages described above and which results in a suitable design from the point of view of manufacture and assembly.
Enligt uppfinningen Ézstadkoms detta genom att friktionsringen, som har en mindre yttre diameter ön borrningen i kolvemär plastiskt deformerbar, vilken ring sedan den införts i borrningen, hålls fast med radiellt spel i den ring- formade urtagningen som ett resultat av expansion till en yttre diameter som överskrider borrningens diameter .According to the invention this is achieved by holding the friction ring, which has a smaller outer diameter than the bore in the piston, plastically deformable, which ring after it has been inserted into the bore, is held with radial play in the annular recess as a result of expansion to an outer diameter exceeds the diameter of the bore.
Denna teknik eliminerar behovet av ytterligare fixeringsanordningar. Mycket starka friktionskrafter kan upptagas och kolvens totallängd reduceras till ett minimum vilket är en speciell fördel vid trumbromsar.This technology eliminates the need for additional fixing devices. Very strong frictional forces can be absorbed and the total length of the piston is reduced to a minimum, which is a special advantage with drum brakes.
Genom att utföra friktionsringen i elastiskt material, stål C 35 , kan mycket stora friktionskrafter erhållas .By making the friction ring in elastic material, steel C 35, very large frictional forces can be obtained.
Som ett resultat av att friktionsringens innerdiameter ökar till ungefär 97 % av styrpinnens diameter, underlättas inpassningen av kolven.As a result of the inner diameter of the friction ring increasing to about 97% of the diameter of the guide pin, the fitting of the piston is facilitated.
Eftersom expansionen av friktionsringen till dess slutliga yttre diameter endast sker vid inpassningen av kolven dä styrpinnen är fixerad i cylinderbasen, kompenseras eventuella toleranser hos styrpinnens diameter. Priktions- kraften beror nu enbart pä elasticitetsmodulen för friktionsringens material och kan betraktas som konstant för inställnings anordningen.Since the expansion of the friction ring to its final outer diameter only takes place during the fitting of the piston when the guide pin is fixed in the cylinder base, any tolerances of the diameter of the guide pin are compensated. The frictional force now depends only on the modulus of elasticity of the material of the friction ring and can be considered as constant for the adjusting device.
Genom att utforma friktionsringen sä att den liknar en läng bussning med en radiell krage som passar i den ringformade urtagningen , kan frikticnskraften ytterligare ökas vid behov, vilket kan föreligga om kraftiga fjädrar för trumbromsar används ., En föredragen utföringsform av uppfinningen beskrivs närmare nedan under hänvisning till bifogade figurer.By designing the friction ring so that it resembles a long bushing with a radial collar which fits in the annular recess, the friction force can be further increased if necessary, which may be the case if strong springs for drum brakes are used. A preferred embodiment of the invention is described in more detail below with reference to attached figures.
Pig. l visar en sektioner-ad vy av en hjulbromscylinder för trumbroms med ínstöllningsanordning för friktionsbelägg enligt uppfinningen.Pig. 1 shows a sectional view of a wheel brake cylinder for drum brake with friction lining adjusting device according to the invention.
Pig. 2 visar en friktionsbussning före monteringen.Pig. 2 shows a friction bushing before mounting.
I figurerna betecknar 9 en cylinder med kolv 4 avtätad med en gummiring 6.In the figures, 9 denotes a cylinder with piston 4 sealed with a rubber ring 6.
Kolvens friktionsyta är skyddad mot föroreningar medelst en skyddsmanschett 5.The friction surface of the piston is protected against contamination by means of a protective sleeve 5.
I en borming i cylindern 9 är en styrpinne 3 fixerad, axiellt i förhållande till kolven, vilken styrpinne går in i en stegad borrning 8 i kolven. Den första sektionen i bormingen. 8 , sett från cylinderbasen, har en diameter dK som är större än styrpinnens diameter dB och har en ringformad urtagning 1 som i: 7907785-5 slutar vid steget ll till den andra sektionen i borrningen 8 . Denna andra sektion upptar styr-pinnen 3 och har en diameter som ör något större ön dennas diameter dB. Över styrpinnen 3 och i fríktionskontakt med denna ör en frik- tionsring 2 anordnad, som i den ringformade urtagningen l i kolven 4 , har ett radiellt sövöl som ett visst axiellt spel, vilket senare motsvarar bromsspelet.In a bore in the cylinder 9, a guide pin 3 is fixed, axially relative to the piston, which guide pin enters a stepped bore 8 in the piston. The first section of the borehole. 8, seen from the cylinder base, has a diameter dK which is larger than the diameter dB of the guide pin and has an annular recess 1 which ends at step 11 to the second section of the bore 8. This second section occupies the guide pin 3 and has a diameter which is slightly larger than its diameter dB. A friction ring 2 is arranged above the guide pin 3 and in frictional contact therewith, which, in the annular recess 1 in the piston 4, has a radial mud shaft as a certain axial play, which later corresponds to the brake play.
Om tryakmedium införs genom inloppet 7 till utrymmet 10 glider kolven 4 ut ur cylindern 9 och överbryggar det axiella spelet I.. Om ett bromsbelögg, som aktiveras av kolven, önnu ej kommit i kontakt med friktionsytan, kommer friktionskraften mellan styrpinnen och friktionsringen att övervinnas genom ytterligare tryckökning, varigenom friktionsringen skjuts av kolven över styr- pinnen tills friktionsbelöggen kommer i kontakt med varandra. Nör trycket sjunker öterförs kolven genom en utifrån tillförd kraft det avstånd som mot- svarar det axiella spelet L och kommer till anliggning mot friktionsringen vid steget ll. Eftersom friktionskraften ör större ön den öterförande kraften kommer kolven att stanna i detta löge .If pressure medium is introduced through the inlet 7 to the space 10, the piston 4 slides out of the cylinder 9 and bridges the axial play I. If a brake lining activated by the piston has not yet come into contact with the friction surface, the frictional force between the guide pin and the friction ring will be overcome by further pressure increase, whereby the friction ring is pushed by the piston over the guide pin until the friction pads come into contact with each other. When the pressure drops, the piston is returned by an externally applied force the distance corresponding to the axial play L and comes into abutment against the friction ring at step ll. Since the frictional force of the larger island is the restorative force, the piston will remain in this position.
Före inpassningen har friktionsringen en ytterdiameter dA som är något mindre ön borrningens 8 första steg. Innerdiametern däremot ör betydligt mindre ön styr- pinnens 3 diameter. Sedan friktionsringen införts iborrningen 8 , ökas dess inre diameter medelst en passningspinne till cza 97 % av styrpinnens 3 diameter dB. Eftersom friktionsringen ör slitsad och består av plastiskt deformerbart material, ökar öven dess ytterdiameter varigenom friktionsringen hölls fast i urtagningen 1. En avfasning av styrpinnens 3 önde underlättar införandet av kolven i cylindern. Endast vid detta steg i monteringen expanderar ringen 2 till sin slutliga ytterdiameter d'A. Pö grund av elasticiteten hölls den sedan kvar på styrpinnen 3 .Prior to fitting, the friction ring has an outer diameter dA which is slightly smaller than the first step of the bore 8. The inner diameter, on the other hand, is much smaller than the diameter of the guide pin 3. After the friction ring has been inserted into the bore 8, its inner diameter is increased by means of a fitting pin to approximately 97% of the diameter dB of the guide pin 3. Since the friction ring is slotted and consists of plastically deformable material, its outer diameter also increases, whereby the friction ring is held in the recess 1. A chamfering of the end of the guide pin 3 facilitates the insertion of the piston into the cylinder. Only at this stage of assembly does the ring 2 expand to its final outer diameter A. Due to the elasticity, it was then retained on the guide pin 3.
Genom att völja en friktionsring med formen av en bussning (fig. 2) med en radiell krage 20, kan friktionskraften ökas på bekostnad av totallöngden.By choosing a friction ring in the form of a bushing (Fig. 2) with a radial collar 20, the frictional force can be increased at the expense of the overall length.
Härigenom ges möjlighet till mycket större friktionskrafter, vilket ör nöd- vöndigt vid trumbrornsar dör mycket starka öterföringsfjödrar anvönds för att stölla in spelet .This gives the opportunity for much greater frictional forces, which is very necessary in the case of drum wells, where very strong feedback springs are used to stall the game.
Som ett resultat av den enkla tillverkningen och monteringen ör produktions- kostnadema lögre för instöllningsanordningar enligt uppfinningen ön för tidigare könda. Konstruktionen medför öven en kort totallöngd vilket ör mycket fördelaktigt vid trumbromsar. flrwfflflfiï' , _ r :ti fr I J. i. »Ål-Mif Arn»As a result of the simple manufacture and assembly, the production costs for adjusting devices according to the invention are lower than previously known. The construction also results in a short overall length, which is very advantageous for drum brakes. fl rwf flflfi ï ', _ r: ti fr I J. i. »Ål-Mif Arn»
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2842433A DE2842433C2 (en) | 1978-09-29 | 1978-09-29 | Automatic friction adjustment |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7907785L SE7907785L (en) | 1980-03-30 |
SE437863B true SE437863B (en) | 1985-03-18 |
Family
ID=6050826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7907785A SE437863B (en) | 1978-09-29 | 1979-09-20 | AUTOMATIC FRICTION COVER ADJUSTMENT DEVICE |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5547026A (en) |
DE (1) | DE2842433C2 (en) |
ES (1) | ES245833Y (en) |
FR (1) | FR2437529A1 (en) |
GB (1) | GB2030667B (en) |
IT (1) | IT1123748B (en) |
SE (1) | SE437863B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5076593A (en) * | 1990-11-05 | 1991-12-31 | Itt Corporation | Disc brake caliper seal |
DE4104070A1 (en) * | 1991-02-11 | 1992-08-13 | Teves Gmbh Alfred | Brake cylinder seal - has reduced brake ring contact area on piston |
DE19916268A1 (en) * | 1999-04-12 | 2000-10-19 | Continental Teves Ag & Co Ohg | Disc brake with automatic adjustment device |
DE10012358A1 (en) * | 2000-03-14 | 2001-09-20 | Magenwirth Gmbh Co Gustav | Model racing auto hydraulic brake has self-adjusting piston |
DE10351464A1 (en) * | 2003-11-04 | 2005-06-02 | Zf Friedrichshafen Ag | Mechanical adjusting device for the actuating piston of multiple disk brakes or clutches comprises a spring assembly with a spring element and a play-compensation assembly with a displaceable annular part |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1111042B (en) * | 1955-01-14 | 1961-07-13 | Zapadoceske Autodruzstvo Lidov | Device on hydraulic brakes for automatic readjustment of the play of the brake shoes, especially for motor vehicles |
GB812703A (en) * | 1955-10-06 | 1959-04-29 | Goodyear Tire & Rubber | Automatic brake adjustment mechanism |
GB882926A (en) * | 1957-04-01 | 1961-11-22 | Dunlop Rubber Co | Automatic adjustment devices for brakes |
FR1409409A (en) * | 1964-07-16 | 1965-08-27 | Berliet Automobiles | Brake control cylinder with automatic slack adjustment device |
JPS4211482Y1 (en) * | 1964-08-04 | 1967-06-27 | ||
DE1260240B (en) * | 1966-07-21 | 1968-02-01 | Teves Gmbh Alfred | Self-acting and steplessly acting adjusting device for the air gap of a hydraulically operated friction brake, in particular a partially-lined disc brake |
GB1206276A (en) * | 1967-10-06 | 1970-09-23 | Teves Gmbh Alfred | Improvements in or relating to disc brakes |
JPS487234U (en) * | 1971-06-08 | 1973-01-26 | ||
JPS5414593Y2 (en) * | 1972-09-04 | 1979-06-15 | ||
JPS4972640U (en) * | 1972-10-12 | 1974-06-24 |
-
1978
- 1978-09-29 DE DE2842433A patent/DE2842433C2/en not_active Expired
-
1979
- 1979-09-20 SE SE7907785A patent/SE437863B/en not_active IP Right Cessation
- 1979-09-20 GB GB7932680A patent/GB2030667B/en not_active Expired
- 1979-09-26 IT IT26036/79A patent/IT1123748B/en active
- 1979-09-26 FR FR7923903A patent/FR2437529A1/en active Granted
- 1979-09-28 ES ES1979245833U patent/ES245833Y/en not_active Expired
- 1979-09-29 JP JP12480179A patent/JPS5547026A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
DE2842433C2 (en) | 1984-06-07 |
FR2437529B1 (en) | 1983-11-18 |
ES245833Y (en) | 1980-12-16 |
GB2030667B (en) | 1982-10-27 |
FR2437529A1 (en) | 1980-04-25 |
JPS6227290B2 (en) | 1987-06-13 |
GB2030667A (en) | 1980-04-10 |
JPS5547026A (en) | 1980-04-02 |
DE2842433A1 (en) | 1980-04-17 |
IT1123748B (en) | 1986-04-30 |
ES245833U (en) | 1980-06-01 |
SE7907785L (en) | 1980-03-30 |
IT7926036A0 (en) | 1979-09-26 |
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Legal Events
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NUG | Patent has lapsed |
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