AT400833B - Power take-off, in particular for the front power take- off shaft of an agricultural tractor - Google Patents

Power take-off, in particular for the front power take- off shaft of an agricultural tractor Download PDF

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Publication number
AT400833B
AT400833B AT99894A AT99894A AT400833B AT 400833 B AT400833 B AT 400833B AT 99894 A AT99894 A AT 99894A AT 99894 A AT99894 A AT 99894A AT 400833 B AT400833 B AT 400833B
Authority
AT
Austria
Prior art keywords
gear
wheel
shaft
pto
output shaft
Prior art date
Application number
AT99894A
Other languages
German (de)
Other versions
ATA99894A (en
Original Assignee
Hydrac Landmaschinenfabrik Pue
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 Hydrac Landmaschinenfabrik Pue filed Critical Hydrac Landmaschinenfabrik Pue
Priority to AT99894A priority Critical patent/AT400833B/en
Publication of ATA99894A publication Critical patent/ATA99894A/en
Application granted granted Critical
Publication of AT400833B publication Critical patent/AT400833B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H3/00Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/04Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion with internally-toothed gears
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00Arrangement or mounting of transmissions in vehicles
    • B60K17/28Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of power take-off

Abstract

A power take-off 2 has an input shaft 4 that can be driven by the engine of the tractor and an output shaft 6 which forms a power take-off stub 5, the two shafts 4, 6 being connected to one another in terms of drive via an input gear 7 seated on the input shaft 4, an output gear 8 seated on the output shaft 6 and, if appropriate, an intermediate gear 15 which meshes with the input gear 7 and the output gear 8. To enable the power take-off stub to be driven in both directions of rotation and at different speeds with a simple compact design, the intermediate gear 15 has two internal gear rings 16, 17 of different diameters coaxial with the output shaft 6, the input gear 7 is in constant mesh with the outer internal gear ring 16 of the intermediate gear 15, and the output gear 8 is arranged on the output shaft 6 in a manner which prevents relative rotation but allows sliding displacement and the said output gear 8 can be brought into engagement either with the input gear 7 or the inner internal gear ring 17 of the intermediate gear 15. <IMAGE>

Description


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   The invention relates to a PTO, in particular for the front PTO
Agricultural tractors. with an input shaft that can be driven by the tractor engine and an output shaft that forms a stub shaft, both axially parallel. stored in a gearbox
Waves over a drive wheel sitting on the input shaft, one on the output shaft
Output gear and possibly an intermediate gear meshing with the drive gear and the output gear are in drive connection with one another.



   Most agricultural tractors are equipped with front and rear PTO shafts that work in the same direction
Rotate the direction of rotation clockwise, the speeds of the rear PTO 540 rpm and the
Front PTO should be 1000 rpm. Many attachments are therefore coordinated with it, so that it
Rear attachments with a nominal drive speed of 540 rpm and front-wheel drive devices with a nominal drive speed of 1000 rpm, each clockwise in the direction of travel.

   In order to be able to use attachments of this type without their own reversing gear alternately on the rear or front, PTO gearboxes with two PTO stub stubs have already been proposed; Because of the need for two PTO stubs, a corresponding design effort and, above all, a considerable space requirement for the PTO gearbox have to be accepted.



   According to DE-A-32 09 849 a front PTO is also known which has a planetary gear with a friction clutch assigned to the planet carrier for driving the PTO stub, but the PTO stub can only be driven in one direction of rotation and at a rotational speed of 1 hour. In addition, JP 61-157 434 already shows a front PTO transmission, the output shaft of which is mounted coaxially with the drivable input shaft and the output and input shaft of which is meshed with a drive wheel seated on the input shaft and, if necessary, with the drive wheel and a driven wheel seated on the output shaft Intermediate wheel in drive connection.

   Here, the driven gear is internally toothed and meshes with the externally toothed idler gear in one switching position, but forms the drive connection with the input shaft in the second switching position by means of splines, so that this movement reduces the speed only once when the direction of rotation of the input shaft is reversed and on the other hand without reduction and Reversing the direction of rotation drives the PTO shaft stub, making this connection unsuitable for connecting an attachment designed for rear operation.



   The invention is therefore based on the object to eliminate these deficiencies and to provide a PTO transmission of the type described which allows the connection of both rear and front attachments in the simplest possible and space-saving manner.



   The invention solves this problem in that the idler gear has two internal sprockets of different diameters coaxial with the output shaft, that the externally toothed drive gear constantly meshes with the outer idler gear of the idler gear and that the externally toothed driven gear is non-rotatably but slidably arranged on the output shaft and optionally with a switching device the drive wheel or the inner ring gear of the idler gear can be engaged.

   Since the driven gear is used as a ratchet and this ratchet, depending on the input with the drive gear or the idler gear, couples the output shaft to the input shaft via a direct gear stage or via a gear stage with idler gear, one and the same PTO stub can be turned left or right and at different speeds drive. By choosing appropriate gear ratios, this PTO shaft offers a PTO stub, for example as a front PTO gearbox, which can be driven either clockwise with 1000 cumin or counterclockwise with 540 rpm. The meshing of the drive or

   Output wheels and the idler gear a compact construction with a small depth, which does not affect the mounting conditions on the tractor or the like. The PTO shaft can therefore be used for practically every PTO shaft and is also ideal for retrofitting.



   If the hollow idler gear is rotatably mounted in the gearbox housing and it accommodates a rotary bearing for the output shaft, a very stable and robust construction can be achieved with little construction effort.



   As such, the driven gear could have two different gear rings, assigned on the one hand to the drive wheel and on the other hand to the inner inner ring gear of the intermediate wheel, but advantageously the radius difference of the two inner toothed rings of the intermediate wheel corresponds to the diameter of the drive wheel, so that the driven wheel with a common outer ring gear both with the secondary gear and can also comb with the idler gear and the all the more. halfweg only needs to be a little more than the sprocket width of the reduction gear, which enables the dimensions of the reduction to be minimized.

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   In the drawing, the subject of the invention is shown schematically using an exemplary embodiment, and that FIGS. 1 and 2 each show in axial section an inventive PTO transmission in its two switching positions.



   In order to be able to equip an only indicated agricultural tractor 1 with a front PTO shaft which can optionally be driven in both directions of rotation and at different speeds, a PTO shaft transmission 2 is provided, in the transmission housing 3 of which an input shaft 4 which can be driven by the tractor engine and an output shaft 6 which is parallel to the shaft and forms a PTO shaft stub 5 are stored. An externally toothed drive wheel 7 sits on the input shaft 4 in a rotationally and displaceably fixed manner, and on the output bet 6 there is also an externally toothed driven wheel 8 which is arranged in a rotationally fixed but slidably adjustable manner, a switching device 9 being provided for the sliding adjustment.

   This switching device 9 consists of a shift fork 11 which engages on the hub 10 of the driven wheel 8 and which can be actuated via a toothed rack 12 and a pinion 14 rotatable by means of a crank handle 13.



   In the gear housing 3, an intermediate gear 15 designed as a ring gear is additionally rotatably mounted, which has two internal gear rings 16, 17 which are coaxial with the output shaft 6, the external internal gear ring 16 constantly meshing with the drive gear 7 and the internal internal gear ring 17 opposite the external internal gear ring 16 around the diameter of the drive wheel 7 has a smaller diameter. On the output side next to the inner ring gear 17, the intermediate wheel 15 receives a rotary bearing 18 for supporting the output shaft 6.



   The driven wheel 8 serves as a ratchet wheel and can be brought into engagement either with the drive wheel 7 or the inner ring gear 17 of the intermediate wheel 15. As shown in FIG. 1, that output gear 8 meshes with the drive gear 7, for example the output shaft 6 and thus the PTO stub 5 are driven clockwise at 1000 rpm in the direction of travel, the drive connection being made directly via the drive gear 7 and the output gear 8 resulting gear stage comes about and the idler 15 runs idle.

   On the other hand, if, according to FIG. 2, the output gear 8 is axially adjusted by actuating the switching device 9 and brought into engagement with the inner ring gear 17 of the idler gear 15, the drive connection results via the gear stage including the idler gear 15 and the output shaft 6 and thus the PTO stub 5 in opposite directions and at a lower speed of, for example, 540 rpm.



   The PTO 2 according to the invention offers the possibility of driving a PTO in both directions of rotation and at different speeds, whereby the simple and robust as well as space-saving and compact construction is ensured by the assignment of the two externally toothed drive and driven wheels to a two-toothed internally toothed idler gear.



  

Claims (3)

  1. Claims 1. PTO gearbox, in particular for the front PTO of an agricultural tractor, with an input shaft that can be driven by the tractor engine and an output shaft that forms a PTO stub, which load axially parallel shafts mounted in a gearbox housing via a shaft on the Input shaft seated drive wheel, an output wheel seated on the output shaft and, if appropriate, an intermediate wheel meshing with the drive wheel and the driven wheel are in drive connection with one another, characterized in that the intermediate wheel (15) has two internal gear rings (16, coaxial with the output shaft (6)). 17) of different diameters, that the externally toothed secondary gear (7) constantly meshes with the outer inner ring gear (16) of the idler gear (15) and that the externally toothed driven gear (8) rotates,    but arranged to be adjustable on the output shaft (6) and, via a switching device (9), optionally with the secondary wheel (7) or the interior Inner ring gear (17) of the idler gear (15) can be engaged.
  2. 2. PTO shaft according to claim 1, characterized in that the hollow intermediate wheel (15) in Gear housing (3) is rotatably mounted and receives a rotary bearing (18) for the output shaft (6).
  3. 3. PTO shaft according to claim 1 or 2, characterized in that the difference in radius of the two internal ring gears (16, 17) of the intermediate wheel (15) corresponds to the diameter of the drive wheel (7).
AT99894A 1994-05-13 1994-05-13 Power take-off, in particular for the front power take- off shaft of an agricultural tractor AT400833B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT99894A AT400833B (en) 1994-05-13 1994-05-13 Power take-off, in particular for the front power take- off shaft of an agricultural tractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT99894A AT400833B (en) 1994-05-13 1994-05-13 Power take-off, in particular for the front power take- off shaft of an agricultural tractor

Publications (2)

Publication Number Publication Date
ATA99894A ATA99894A (en) 1995-08-15
AT400833B true AT400833B (en) 1996-03-25

Family

ID=3504596

Family Applications (1)

Application Number Title Priority Date Filing Date
AT99894A AT400833B (en) 1994-05-13 1994-05-13 Power take-off, in particular for the front power take- off shaft of an agricultural tractor

Country Status (1)

Country Link
AT (1) AT400833B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209849A1 (en) * 1982-03-18 1983-09-29 Georg Albersinger Front power lift with power take-off shaft for tractors
JPS61157434A (en) * 1984-12-28 1986-07-17 Iseki & Co Ltd Speed change gear in working power take-off unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209849A1 (en) * 1982-03-18 1983-09-29 Georg Albersinger Front power lift with power take-off shaft for tractors
JPS61157434A (en) * 1984-12-28 1986-07-17 Iseki & Co Ltd Speed change gear in working power take-off unit

Also Published As

Publication number Publication date
ATA99894A (en) 1995-08-15

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ELJ Ceased due to non-payment of the annual fee