EP0102475B1 - Agencement de levier, en particulier pour tracteur agricole - Google Patents

Agencement de levier, en particulier pour tracteur agricole Download PDF

Info

Publication number
EP0102475B1
EP0102475B1 EP83106534A EP83106534A EP0102475B1 EP 0102475 B1 EP0102475 B1 EP 0102475B1 EP 83106534 A EP83106534 A EP 83106534A EP 83106534 A EP83106534 A EP 83106534A EP 0102475 B1 EP0102475 B1 EP 0102475B1
Authority
EP
European Patent Office
Prior art keywords
lever
key
control lever
pivot
shift lever
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
EP83106534A
Other languages
German (de)
English (en)
Other versions
EP0102475A2 (fr
EP0102475A3 (en
Inventor
Lloyd Lowell Lane
Gregory Sander Hosford
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Priority to AT83106534T priority Critical patent/ATE30644T1/de
Publication of EP0102475A2 publication Critical patent/EP0102475A2/fr
Publication of EP0102475A3 publication Critical patent/EP0102475A3/de
Application granted granted Critical
Publication of EP0102475B1 publication Critical patent/EP0102475B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
    • G05G1/04—Controlling members for hand actuation by pivoting movement, e.g. levers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/005—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for preventing unintentional use of a control mechanism
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7018—Interfitted members including separably interposed key
    • Y10T403/7021—Axially extending
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20012—Multiple controlled elements
    • Y10T74/20018—Transmission control
    • Y10T74/20085—Restriction of shift, gear selection, or gear engagement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20636—Detents
    • Y10T74/20642—Hand crank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20636—Detents
    • Y10T74/2066—Friction

Definitions

  • the invention relates to a lever arrangement, in particular for agricultural tractors, with a shift lever which can be pivoted from an initial position and which is mounted on a fixed pin via a non-circular opening and can be removed from a grid point against the action of a spring before being pivoted out of the initial position.
  • the pin has a machined in its lateral surface parallel to its longitudinal axis keyway, in which a wedge connected to the shift lever can only be locked in the starting position of the shift lever, or that the shift lever in its non-circular opening with a Wedge groove running parallel to the longitudinal axis of the pin is provided, into which a wedge connected to the pin can only be locked in the initial position of the shift lever.
  • the starting position of the shift lever with respect to the pin is precisely defined.
  • the interlocking connection between the keyway and the key can be produced in a cost-effective manner, relatively free of play, and ensures a high degree of functional reliability even in the event of vibrations due to uneven road surfaces and oblique or lateral movement of the shift lever by the operator.
  • the manually operable shift lever is connected to a PTO control valve for hydraulically switching on a PTO drive, the PTO control valve being movable into a second position depending on the pivoting movement of the shift lever and can be returned to a first position together with a corresponding movement of the shift lever under the action of a spring, if the hydraulic pressure drops below a predetermined value, the wedge is provided in the non-circular opening of the shift lever and, when disengaged, runs out of the keyway on the lateral surface of the pin , is always ensured that due to the arrangement according to the invention the shift lever is automatically moved back into its starting position when the PTO drive is interrupted due to insufficient hydraulic pressure. An intentional switch-on movement by the operator is then required in order to switch on the PTO again. This also means that even when the engine is switched off, due to the complete reduction in pressure that then occurs, the shift lever is automatically returned to its starting position and engages there.
  • connection between the shift lever and the pin is designed such that the running surface of the wedge has a radius of curvature, which corresponds to the radius of curvature of the pin.
  • the keyway has side surfaces which are aligned parallel to one another and are arranged perpendicular to their bottom surface.
  • the PTO lever switching arrangement is designated 10. It has a shift lever 12 which is pivotally mounted on a support plate 16 via a pin 14. The latter is connected in the embodiment with the frame of a tractor behind an instrument panel 18 and arranged so that the shift lever 12 extends through a slot 20 in the instrument panel into the interior of a driver's cabin, not shown. There, the shift lever 12 is provided with a handle so that an operator can adjust it between a first position in which the PTO drive is switched off and which is shown in solid lines in FIG. 1, and a second position in which the PTO drive is switched on and that in dash-dotted lines (position 12 A) is indicated. As a rule, the shift lever 12 is arranged to the left of the steering wheel column, also not shown, and runs the risk that it can be inadvertently adjusted by a person entering or exiting the tractor cab.
  • An inner end of the shift lever 12 is connected via a bolt 24 to a lever 26 which, as can be seen from FIG. 2, engages a PTO control valve 28.
  • This is equipped with a displaceable valve slide 30 which is pressed by a spring 32 into a first position in which the PTO drive is switched off and which is shown in FIG. 2. If the valve spool 30 is moved from its position shown in FIG. 2 to the left into a second position in which the PTO drive is engaged, hydraulic pressure medium passes from a feed pump 31 via a line 33 and a groove 34 machined into the valve spool 30 to one hydraulically actuated clutch 36. Depending on whether the hydraulically actuated clutch 36 is engaged or disengaged, the PTO drive is also engaged or disengaged. When the PTO is engaged, the PTO (not shown) rotates and can drive an implement.
  • the lever 26 moves the valve slide 30 inwards or with reference to FIG. 2 to the left and thereby compresses the spring 32.
  • locking balls 40 which are arranged around the valve spool 30 and can be actuated via the hydraulic pressure medium, are pressed into a groove 42 incorporated into the periphery of the valve spool 30, which thereby hold the valve spool 30 in its second position until the valve spool 30 physically is moved back to its right position by actuating the shift lever 12.
  • the spring 32 will push the valve slide 30 to the right into its position shown in FIG. 2, the detent balls 40 emerging from the groove 42.
  • the shift lever 12 is pivotally mounted on the fixed pin 14 by means of an oval or non-circular opening worked into it. This allows the shift lever 12 to move in or out of the dashboard 18 in the radial direction.
  • the switching lever 12 is pulled into the valve housing in the direction of the first position by a spring 46 which is provided at one end in an opening 48 in the switching lever 12 and at the other end on a pin 50 on the support plate 16.
  • the PTO lever arrangement 10 is further provided with a keyway 52, which is incorporated into the periphery of the pin 14 such that it runs parallel to the longitudinal central axis of the pin 14.
  • the keyway 52 has mutually parallel side surfaces 54 and 56, which are arranged perpendicular to a bottom surface 58, and is shaped such that it can accommodate a key 60. This is provided on the inner wall of the oval opening 49 and engages in the keyway 52 when the shift lever 12 is in its first position. If, on the other hand, the shift lever is in its second position, the wedge 60 rests on the periphery of the pin 14.
  • the wedge 60 is preferably provided with a concave surface 62 which has a radius of curvature which corresponds approximately to that of the pin 14.
  • the key 60 is also provided with mutually parallel side surfaces 64 and 66 which are aligned parallel to the side surfaces 54 and 56 of the keyway 52 when the key 60 engages in the keyway 52.
  • the parallel arrangement ensures that the shift lever 12 cannot be moved to its second position unintentionally.
  • the spring 32 will move the valve slide 30 into its right-hand position shown in FIG. 2 and the lever 26 likewise to the right or to the outside.
  • the wedge 60 will slide on the periphery of the pin 14 until the shift lever 12 has been returned to its first position.
  • the key 60 will automatically snap into the keyway 52 as a result of the action of the spring 46 as soon as the shift lever has reached its first position.
  • the spring 46 causes the key 60 to automatically snap into the keyway 52 when the shift lever 12 is manually returned to its first position.
  • lever arrangement can also be designed such that the wedge is on the fixed bolt and the keyway in the shift lever.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Control Devices (AREA)
  • Agricultural Machines (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Control Of Transmission Device (AREA)

Claims (7)

1. Système de levier (10), en particulier pour tracteurs agricoles, comportant un levier de commande (12) pouvant pivoter à partir d'une position de départ, monté par l'intermédiaire d'un orifice non circulaire (44) sur un tourillon fixe (14) et pouvant être écarté d'une position d'encrantement, avant son pivotement à partir de la position de départ, en antagonisme à l'action d'un ressort (46), caractérisé en ce que le tourillon (14) présente une rainure de clavetage (52) s'étendant parallèlement à son axe longitudinal et ménagée dans sa périphérie, dans laquelle une clavette (60) reliée au levier de commande (12) ne peut s'encranter que dans la position de départ de ce levier de commande (12).
2. Système de levier (10), en particulier pour tracteurs agricoles, comportant un levier de commande (12) pouvant pivoter à partir d'une position de départ, monté par l'intermédiaire d'un orifice non circulaire (44) sur un tourillon fixe (14) et pouvant être écarté d'une position d'encrantement, avant son pivotement à partir de la position de départ, en antagonisme à l'action d'un ressort (46), caractérisé en ce que le levier de commande (12) est muni dans son orifice non circulaire (44) d'une rainure de clavetage (52) s'étendant parallèlement à l'axe longitudinal du tourillon (14) et dans laquelle une clavette (60) reliée au tourillon (14) ne peut s'encranter que dans la position de départ du levier de commande (12).
3. Système de levier (10) suivant la revendication 1, en particulier pour l'embrayage et le débrayage d'un arbre de prise de force de tracteurs agricoles, dont le levier de commande (12) pouvant être actionné manuellement est relié à une valve (26) de commande d'arbre de prise de force pour l'embrayage hvdraulique d'un mécanisme d'entraînement (38) d'arbre de prise de force, la valve (28) de commande de l'arbre de prise de force pouvant être amenée dans une seconde position en fonction du mouvement de pivotement du levier de commande (12) et pouvant être rappelée sous l'action d'un ressort (32) dans une première position conjointement à un déplacement correspondant du levier de commande (12) quand la pression hydraulique tombe au-dessous d'une valeur prédéterminée, caractérisé en ce que la clavette (60) est prévue dans l'orifice non circulaire (44) du levier de commande (12) et se déplace sur la périphérie du tourillon (14) lors de son dégagement de la rainure de clavetage (52).
4. Système de levier suivant la revendication 3, caractérisé en ce que la surface de glissement de la clavette (60) présente un rayon de courbure qui correspond au ravon de courbure du tourillon (14).
5. Système de levier suivant une ou plusieurs des revendications précédentes, caractérisé en ce que la clavette (60) et la rainure de clavetage (52) présentent des flancs ou faces latérales (54, 56 et 64, 66) orientées parallèlement l'une par rapport à l'autre.
6. Système de levier suivant une ou plusieurs des revendications précédentes, caractérisé en ce que la clavette (60) réalise un blocage par friction avec la périphérie du tourillon (14) dans la seconde position de la valve (28) de commande d'arbre de prise de force.
7. Système de levier suivant une ou plusieurs des revendications précédentes, caractérisé en ce que la rainure de clavetage (52) présente des flancs (64, 66) orientés parallèlement l'un à l'autre et perpendiculaires à la surface formant le fond de la rainure.
EP83106534A 1982-07-12 1983-07-05 Agencement de levier, en particulier pour tracteur agricole Expired EP0102475B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83106534T ATE30644T1 (de) 1982-07-12 1983-07-05 Hebelanordnung, insbesondere fuer ackerschlepper.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/397,636 US4517855A (en) 1982-07-12 1982-07-12 Power take-off lever arrangement for a tractor
US397636 1982-07-12

Publications (3)

Publication Number Publication Date
EP0102475A2 EP0102475A2 (fr) 1984-03-14
EP0102475A3 EP0102475A3 (en) 1985-05-22
EP0102475B1 true EP0102475B1 (fr) 1987-11-04

Family

ID=23572022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106534A Expired EP0102475B1 (fr) 1982-07-12 1983-07-05 Agencement de levier, en particulier pour tracteur agricole

Country Status (11)

Country Link
US (1) US4517855A (fr)
EP (1) EP0102475B1 (fr)
JP (1) JPS5939203A (fr)
AR (1) AR231866A1 (fr)
AT (1) ATE30644T1 (fr)
AU (1) AU552993B2 (fr)
BR (1) BR8303701A (fr)
CA (1) CA1195590A (fr)
DE (1) DE3374357D1 (fr)
ES (1) ES524007A0 (fr)
ZA (1) ZA835039B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1314157B1 (it) * 1999-11-11 2002-12-04 New Holland Italia Spa Dispositivo di comando per veicoli, in particolare per veicoliagricoli.
US6533053B2 (en) * 2001-08-08 2003-03-18 Deere & Company Quick detachable drive shaft

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US950290A (en) * 1908-01-09 1910-02-22 Link Belt Co Slip-gear.
US2896315A (en) * 1957-05-31 1959-07-28 Dubberke Walter Harley Method for positioning a wheel upon an axle member
FR1370101A (fr) * 1963-07-08 1964-08-21 Bennes Marrel Perfectionnements aux dispositifs pour la manutention des bennes de transport et notamment de celles équipant des camions
US3786690A (en) * 1972-05-25 1974-01-22 Grand Haven Stamped Prod Lift gate mechanism
US3789694A (en) * 1973-01-02 1974-02-05 Allis Chalmers Friction block for lever
US3985039A (en) * 1974-08-13 1976-10-12 Fmc Corporation Transmission control brake
DE3024451C2 (de) * 1980-06-28 1985-12-05 Elring Dichtungswerke Gmbh, 7012 Fellbach Schaltraste für Fahrzeugschaltgetriebe
DE3175835D1 (en) * 1981-08-03 1987-02-19 Deere & Co Pto lever arrangement for a tractor
US4400995A (en) * 1981-09-23 1983-08-30 Milwaukee Electric Tool Corporation Spindle lock with impacting capability

Also Published As

Publication number Publication date
AR231866A1 (es) 1985-03-29
US4517855A (en) 1985-05-21
AU552993B2 (en) 1986-06-26
DE3374357D1 (en) 1987-12-10
ATE30644T1 (de) 1987-11-15
AU1568183A (en) 1984-01-19
EP0102475A2 (fr) 1984-03-14
BR8303701A (pt) 1984-02-14
JPS5939203A (ja) 1984-03-03
EP0102475A3 (en) 1985-05-22
ES8500470A1 (es) 1984-10-01
CA1195590A (fr) 1985-10-22
ES524007A0 (es) 1984-10-01
ZA835039B (en) 1985-02-27

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