SE503908C2 - Automatically operated centrifugal clutch - Google Patents

Automatically operated centrifugal clutch

Info

Publication number
SE503908C2
SE503908C2 SE9500953A SE9500953A SE503908C2 SE 503908 C2 SE503908 C2 SE 503908C2 SE 9500953 A SE9500953 A SE 9500953A SE 9500953 A SE9500953 A SE 9500953A SE 503908 C2 SE503908 C2 SE 503908C2
Authority
SE
Sweden
Prior art keywords
coupling
centrifugal
jaws
drum
springs
Prior art date
Application number
SE9500953A
Other languages
Swedish (sv)
Other versions
SE9500953L (en
SE9500953D0 (en
Inventor
Hans Jansson
Original Assignee
Electrolux Ab
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 Electrolux Ab filed Critical Electrolux Ab
Priority to SE9500953A priority Critical patent/SE503908C2/en
Publication of SE9500953D0 publication Critical patent/SE9500953D0/en
Priority to US08/599,920 priority patent/US5680920A/en
Priority to IT96PN000014A priority patent/IT1289366B1/en
Priority to DE19610049A priority patent/DE19610049B4/en
Priority to JP05931596A priority patent/JP3820441B2/en
Publication of SE9500953L publication Critical patent/SE9500953L/en
Publication of SE503908C2 publication Critical patent/SE503908C2/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/10—Transmission clutches specially designed for chain saws
    • 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
    • F16D43/00—Automatic clutches
    • F16D43/02—Automatic clutches actuated entirely mechanically
    • F16D43/04—Automatic clutches actuated entirely mechanically controlled by angular speed
    • F16D43/14—Automatic clutches actuated entirely mechanically controlled by angular speed with centrifugal masses actuating the clutching members directly in a direction which has at least a radial component; with centrifugal masses themselves being the clutching members
    • F16D43/18—Automatic clutches actuated entirely mechanically controlled by angular speed with centrifugal masses actuating the clutching members directly in a direction which has at least a radial component; with centrifugal masses themselves being the clutching members with friction clutching members

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)

Abstract

The centrifugal clutch has two or more, esp. three, shoes (13) with friction linings, rotating inside a drum (15). The drum is connected to the output shaft and there is a spider (12), connected to the input shaft (10), which is driven by an engine or motor. The arms of the spider engage in slots in the shoes, so that the shoes rotate with the shaft but may slide radially outwards. C-shaped springs (16) engage with hooks on the ends of the shoes and urge them inward toward each other, away from contact with the inside of the drum. Each spoke has a cross-section with two sideways displaced regions, engaging complementary regions in the slot in the shoe.

Description

lO 15 20 25 30 503 908 2 bart införd i ett fiâ"mbtsväšàiiÄ sätt utformat urtag i en kopp- lingsback, varigenom inbördes styrning i sidled av ekern och kopplingsbacken säkerställes. l 20 15 20 25 30 503 908 2 bar inserted into a recess designed in a coupling jaw, whereby mutual lateral control of the spoke and the coupling jaw is ensured.

Uppfinningen beskrives närmare nedan under hänvisning till bifogade ritning, på vilken _ fig. 1 visar en planvy av centrifugalkopplingen enligt upp- finningen och fig. 2 är en tvärsektion längs linjen II-II i fig. 1.The invention is described in more detail below with reference to the accompanying drawing, in which Fig. 1 shows a plan view of the centrifugal coupling according to the invention and Fig. 2 is a cross section along the line II-II in Fig. 1.

Den på ritningen visade centrifugalkopplingen innefattar ett nav 10 avsett att fastsättas på en ej visad motoraxel och för detta ändamål försett med ett gängat hål 11. Navet 10 har tre radiellt riktade ekrar 12, som var och en uppbär en radiellt för- skjutbar kopplingsback 13. Backarna är försedda med cirkelbåg- formade friktionsytor anordnade att ingripa med en omgivande kopplingstrumma 15 under inverkan av centrifugalkraften. Vid sina ändar är backarna 13 försedda med fästen för dragfjädrar 16, vilka består av C-formade bladfjädrar inspända mellan närbelägna ändar av backarna. Fjädrarna 16 fungerar såsom returfjädrar och strävar att frigöra backarna 13 från trumman 15.The centrifugal coupling shown in the drawing comprises a hub 10 intended to be attached to a motor shaft (not shown) and for this purpose provided with a threaded hole 11. The hub 10 has three radially directed spokes 12, each of which carries a radially displaceable coupling jaw 13. The jaws are provided with circular arc-shaped friction surfaces arranged to engage with a surrounding coupling drum 15 under the influence of the centrifugal force. At their ends, the jaws 13 are provided with brackets for tension springs 16, which consist of C-shaped leaf springs clamped between adjacent ends of the jaws. The springs 16 function as return springs and strive to release the jaws 13 from the drum 15.

Såsom bäst framgår av fig. 2, har navets 10 ekrar 12 en Z-formig tvärsektion bestående av två integrerade, i sidled för- skjutna, rektangulära delar 12a och 12b. Kopplingsbackarna 13 har ett urtag med motsvarande utformning, i vilket ekern är införd med lämplig passning. Genom den nämnda sidoförskjutningen av ekerdelarna 12a och 12b bildas stödytor, som visat sig säker- ställa en förbättrad styrning av backarna i sidled utan att några särskilda styrorgan i form av brickor, fjäderbleck eller liknande behöver användas. Den visade utformningen av navet och backarna är dessutom väl lämpad för framställning i sintermetall. Till- verkningen och monteringen av centrifugalkopplingen har däri- genom förenklats, samtidigt som dess funktion förbättrats.As best seen in Fig. 2, the spokes 12 of the hub 10 have a Z-shaped cross section consisting of two integrated, laterally offset, rectangular portions 12a and 12b. The coupling jaws 13 have a recess with a corresponding design, in which the spoke is inserted with a suitable fit. Due to the said lateral displacement of the spoke parts 12a and 12b, support surfaces are formed, which have been found to ensure an improved guide of the jaws laterally without the need for any special guide means in the form of washers, spring plates or the like. The design of the hub and jaws shown is also well suited for production in sintered metal. The manufacture and assembly of the centrifugal coupling has thereby been simplified, at the same time as its function has been improved.

Claims (4)

10 15 20 503 908 Patentkrav10 15 20 503 908 Patent claims 1. Centrifugalkoppling för ett motordrivet arbetsredskap, såsom (10) avsett att drivbart förbindas med en motoraxel, samt minst två kopplingsbackar (13) en motorsåg, innefattande ett nav drivbart förbundna med navet och radiellt rörliga för att under inverkan av centrifugalkraften bringas att ingripa med en kopp- lingsbackarna radiellt omgivande kopplingstrumma (15) mot verkan av fjäderorgan (16), som strävar att frigöra kopplingsbackarna från kopplingstrumman, varvid var och en av kopplingsbackarna är förskjutbart förbunden med en med navet integrerad eker (12), kännetecknad av att var och en av ekrarna (12) har en tvärsektion innefattande två integrerade, rektangulära, sidoförskjutna delar (12a, 12b) och är förskjutbart införd i ett på motsvarande sätt utformat urtag i en kopplingsback, varigenom inbördes styrning i sidled av ekern och kopplingsbacken säkerställes.A centrifugal coupling for a motor-driven work tool, such as (10) intended to be drivably connected to a motor shaft, and at least two coupling jaws (13) a chainsaw, comprising a hub drivably connected to the hub and radially movable to be engaged under the action of centrifugal force. a coupling jaw radially surrounding the coupling drum (15) against the action of spring means (16) which seek to release the coupling jaws from the coupling drum, each of the coupling jaws being slidably connected to a spoke (12) integrated with the hub, characterized in that each one of the spokes (12) has a cross section comprising two integrated, rectangular, laterally offset parts (12a, 12b) and is slidably inserted into a correspondingly shaped recess in a coupling jaw, whereby mutual lateral control of the spoke and the coupling jaw is ensured. 2. Centrifugalkoppling enligt patentkravet 1, kännetecknad av att fjäderorganen (16) innefattar fjädrar inspända mellan när- belägna ändar av kopplingsbackarna (13).Centrifugal coupling according to claim 1, characterized in that the spring means (16) comprise springs clamped between adjacent ends of the coupling jaws (13). 3. Centrifugalkoppling enligt patentkravet 2, kännetecknad av att fjädrarna (16) utgöres av dragfjädrar.Centrifugal coupling according to Claim 2, characterized in that the springs (16) consist of tension springs. 4. Centrifugalkoppling enligt patentkravet 3, kännetecknad av att dragfjädrarna (16) utgöres av C-formade bladfjädrar.Centrifugal coupling according to Claim 3, characterized in that the tension springs (16) consist of C-shaped leaf springs.
SE9500953A 1995-03-17 1995-03-17 Automatically operated centrifugal clutch SE503908C2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE9500953A SE503908C2 (en) 1995-03-17 1995-03-17 Automatically operated centrifugal clutch
US08/599,920 US5680920A (en) 1995-03-17 1996-02-12 Centrifugal clutch
IT96PN000014A IT1289366B1 (en) 1995-03-17 1996-02-28 CENTRIFUGAL CLUTCH
DE19610049A DE19610049B4 (en) 1995-03-17 1996-03-14 centrifugal clutch
JP05931596A JP3820441B2 (en) 1995-03-17 1996-03-15 Centrifugal clutch for power-driven work tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9500953A SE503908C2 (en) 1995-03-17 1995-03-17 Automatically operated centrifugal clutch

Publications (3)

Publication Number Publication Date
SE9500953D0 SE9500953D0 (en) 1995-03-17
SE9500953L SE9500953L (en) 1996-09-18
SE503908C2 true SE503908C2 (en) 1996-09-30

Family

ID=20397582

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9500953A SE503908C2 (en) 1995-03-17 1995-03-17 Automatically operated centrifugal clutch

Country Status (1)

Country Link
SE (1) SE503908C2 (en)

Also Published As

Publication number Publication date
SE9500953L (en) 1996-09-18
SE9500953D0 (en) 1995-03-17

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Legal Events

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NUG Patent has lapsed