DE8137708U1 - PTO CLUTCH - Google Patents

Description

, v PATENT ADVOCATE

DiPL.-PHYs. DR. WALTHER JUNIUS 3 Hanover

WOLFSTRASSE 24 TELEPHONE (05 11) 83 45 30

22.12.1981 Dr.J / Ha My files / 709

Ernst Conrad, Im Westfeld 13, 3101 Nienhagen

PTO clutch

The invention relates to a power take-off shaft coupling for connecting the drive shaft of a device to the power take-off shaft of a device Motor vehicle, in particular an agricultural tractor, consisting of two interlocking coupling members, one of which is arranged at the end of the power take-off shaft and the other at the end of the shaft driving the device.

It is common practice for the end of the PTO shaft to be grooved or toothed and an annular one Has recess. So far, this toothed end of the PTO shaft has an internal toothing or an inward one directed Yorsprüngen with a spacing corresponding to the grooves verselme sleeve pushed over a universal joint is connected to the drive shaft of the device. This sleeve has one (or two) radially movable pegs in front of its front end on, which is pressed with the force of a spring in the axial direction and the one facing outwards The end has a pressure slide that you push a little inwards with your thumb against the force of the spring can. This pin then engages when the sleeve is fully over the

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PTO shaft end is pushed into the annular groove and in this way ensures an immovable seat of the Sleeve on the PTO end. This known and today Commonly used coupling of the drive shaft to the power take-off shaft end not only has the disadvantage that the Coupling the drive shaft to the PTO shaft is a difficult operation, but also has the disadvantage that a large number of work accidents have already occurred during this coupling, the power take-off shaft is a machine part, which protrudes from the back of a gearbox. In itself, when it is not switched on, stand still. But this is sometimes not the case because it is caused by frictional forces inside the gearbox is taken, but sometimes the tractor driver has does not take into account that he has switched on the PTO rotation when no implement is connected. Even then, the PTO shaft protruding freely to the rear Cause accidents. A power take-off shaft is in front of their fronts in some embodiments of tractors axis arranged. Here, too, the aforementioned disadvantages occur on.

Many attempts have already been made from various sides to create a coupling with which the drive shaft can be coupled to the PTO shaft more easily and safely. There are already different ones here Coupling forms have been designed which, however, have generally not been able to be introduced into the company, because they were too expensive and complicated, and, ultimately, significantly increased the weight of the drive shaft but did not bring the desired ease of coupling and the desired safety against accidents.

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that then _f when the shield is not inserted and somj no device is coupled to the power take-off shaft, the power take-off shaft is closed with one coupling member. It is useful here if the force of a spring acts on the displaceable Wend, which pushes this displaceable wall into its closed position.

It is particularly advantageous if from the driver surfaces the driving finger spherical surfaces or l ^ gel-shaped ge surfaces protrude and if in that side of the driver claws on which the Hitnehmerflachen anlj gen, correspondingly negatively shaped recesses are incorporated or molded, these spherical surfaces or Kögel surfaces ensure excellent centering and guarantee a wear-free and friction-free Power transmission.

The following is a description of the invention by means of one The exemplary embodiment shown schematically in the drawing is explained in more detail

Pig. 1 is a rear view of the PTO drive unit with the frame built on this without sliding walls.

Pig. 2 is a rear view of the frame with inserted Shield and sliding wall pushed aside,

Pig »3 a section through the engaged PTO shaft: coupling.

4 shows a section through the power take-off shaft coupling before the coupling process or after the coupling process

Fig. 5 is a view of the shield from the stub shaft side.

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Fig. 6 a view of the shield of the coupling element
page.

Pig. 7 is a side view of the shield with coupling
and stub shaft

Pig. 8 is a view of an actuator.
Pig. 9 is a view of the hook of the actuator rod.
Pig. 10 a section through another coupling element
Pige11 eir> e intention of this coupling element.

A frame 3 is attached to the housing 1 of the power take-off of an agricultural tractor by means of screws 2 and can be locked to the outside by sliding walls or sliding doors 4. A PTO shaft 5 and possibly another PTO shaft 6 protrude into this frame from the gear box 1
PTO shafts are each a coupling element 7 or 8 attached. The coupling element 7 i3t designed like a wheel, has
a Zentralbchrung, the inner surface accordingly
the grooves on the outer surface of the power take-off shaft 5 are provided with projections and have three driver fingers 9.
These driver fingers 9 have a driver surface 10
on, from which a spherical surface 11 or a tapered pin protrudes for centering. This spherical surface can be inserted into a hole and with a pin
or a screwed-in ring held ball. The other PTO shaft has a similar coupling element 8, but which has a different number (two, four or more)
Has driving finger. Below each power take-off shaft there is a funnel 12 as a collecting trough. Above each power take-off shaft there is a hook 13 which can be pivoted about a horizontally positioned shaft and which is pressed against a stop 15 under the force of a spring 14. This attack

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15 is arranged so that the hook is in a Stellun is located in which he by means of his leading edge 16 of j *. the shield 17 raised during insertion and coupling | can be and, as soon as the shield 17 the Einkuppelstel- ^ ' ment has reached behind the shield 17 and holds it in the engaged position.

The funnel 17 not only has two inclined side walls, but also an inclined front wall. This funnel 12 is used for introducing and centering the lower edge of the shield 17.

The shield 17 carries in a bearing 18 a stub shaft 19 which, on the side facing away from the power take-off shaft gear 1, carries a series of grooves or a toothing which is expediently designed in the same way as the power take-off shaft toothing. It is also possible that the stub shaft 19 is part of the following cross joint of the driven machine. On the other side facing the power take-off shaft 1, it carries the second coupling member 20. This coupling member 20 consists of a wheel, on the end face of which near the circumference driver claws 21 are arranged t has an incorporated ball socket 23, in which after one Appeln the ball 11 of the Mitnehmerfingers "engages 9 These balls - one can also truncated cones ^l use - provide excellent centering and ensure a wear and friction-free $ power transmission. , -

The sleeve 24 of the drive shaft 25 for the device to be driven is lifted over and fastened via the stub shaft 19. Part 19,24,25 can also be a single part 3ein, which is connected to the drive shaft of the device. i

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The shield 17 has in its upper part, which protrudes beyond the frame 3, a handle hole 26, so that a handle 27 is formed as the upper end of the shield 17. The shield is worn on this and in the Hopper 12 inserted.

In order to be able to use the shield 17 well in the funnel 12, the shield 17 is cranked twice, with the upper one and at the lower end of the shield there are surfaces that run parallel to one another and that are created by an inclined surface 28 are interrupted. The angle of inclination of this inclined surface is chosen so that when the inclined surface is in contact 28 on the wall of the funnel 12, as shown in Fig. 4 | is shown, the shield 17 is not vertical. In ü the vertical position of the shield 17 (FIG. 3), the surface 28 is less inclined to the vertical than that Wall of the funnel 12.

The lower end of the shield 17 runs either in two centering pins 49 and / or an elongated centering pin 29, which are centered by holes in the bottom of the funnel 12. This centering pin or the centering pin are conical or truncated pyramid-shaped. on in this way the underside of the shield 17 is centered

The upper side of the shield 17 is centered by the hook 13 which falls into a recess 30 provided for its engagement as soon as the shield is pressed from the position in FIG. 4 into the position in FIG. The side edges of the recess 30 cause the centering tion towards the sides, while the _> spring 14 takes over part of the centering force in the vertical direction. The other part of the Zantrierkraft is caused by gravity, which acts on the shield and the connected drive shaft. Fine centering can be effected with adjusting screws 31 at the bottom of the funnel, which are vertically adjustable, and adjusting screws 32 which

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are horizontally adjustable.

The hook 13 has a handle 33 extending through the frame 3. With this handle he can hook 13 are raised so that the shield 17 from the position of the Pig. 3 in the position 4 occurs.

The activities of uncoupling and coupling can be carried out from the tractor seat if a staff is used for this, as shown in Pig »8 and Pig * 9 This rod 34 has a lockable joint 35 in the middle to make it collapsible. On one The end of the rod 34 has a handle 36 and a hook 37 at the other end. This hook 37 has the porm half a pipe, one on the other at one end Recess 38 on v / eist. This hook 37 is used to grip the handle 27. The recess 38 can attack the side surfaces of the handle hole 26, but can also attack the handle 33.

The coupling with this Yorrichtung is carried out in such a way that the shield 17 attached to the end of a drive shaft is inserted with its underside into the funnel 12, as Pig. 4 shows the handle is used for this purpose. The double cranking means that the lower edge of the shield 17 with the centering pin 19 can already be inserted into the funnel 12 when the two coupling parts are still far away from each other. Once the centering pin 29 has been placed over the upper edge of the funnel, the handle 27 can simply be released and the shield 17 will certainly slide into the position shown in FIG. Then all you need is the sign in Pig. 3 pivoted position shown

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to ground, which can be done by simply pressing the handle 27 1 is possible. Here, the coupling parts interlock and move into the engaged position, which: The spring-loaded hook 13 is lifted up by its leading edge 16 and falls behind with its retaining lug the shield 17 as soon as this the vertical position or has reached the coupling position »

To uncouple you only need to grab the handle 33 and to pull it upwards, so that the hook 13 is pivoted against the force of the spring 14. Through this the shield 17 falls from its position shown in FIG. 3 into the position shown in FIG. Thereby requires the decoupling of the two coupling links. The sign is then lifted by the handle 27 and then the shield set aside. All of these work processes run without any risk of accident, because the The operator's hands are far from the PTO shaft and the rotating coupling parts.

The coupling element 39 shown in Fig. 10 is slidably angeaänet on the power take-off shaft 5, which at its end has a Limiter for the displacement of the coupling element 39 in Fo a resilient locking ring 40 carries, which in a Nu is mounted on the PTO end. The coupling element 39 is under the force of a spring 41, which is against the loierteller 42, which in turn is pressed against a shoulder 50 on the power take-off shaft 5. In hemispherical out Receipts 43 of the driving surfaces 44 of the kit-taker fingers 4 balls 46 are used, which carry pins 47, which with Speil in axially parallel bores 48 in the driver fingers 45 are stored. These pins prevent the balls from falling out. The spring 41 facilitates a dome

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by pushing back the coupling member "enabled when engaging. The pushed-back clutch link 39 jumps when the PTO shaft rotates Immediately into the coupling position as soon as the driving claws of the other coupling member allow this.

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in a PTO system to Terfeindvag of the drive "Ell" of a variety of PTO ice! Foterfafer-

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Claims (1)

(25)
(20) © la SekLM (17) ia lorn iet _e ppgg (20) tragemä® W @ il © (3) Be £ © i3tigrasgs (17) ? ®xgß & ®hm 1 _e al © for daa SoMIa (17) (5) aag © arda © tea (12) ^ sifi © laea tber € @ r Sspfroäle (5) aag © ®rfito © t © a ₉ © nt «f * gea d« e Kraft eiiiar l * ed @ r (14) rerecfteeäk ^ aren hook (13) with Jüalaufsohräge (16). the Schilt (17) aa-3 Qisor aai * w © iBal gefcr®p £ ton, Platt® that ä @ s SeMlä (17) (29) ^> dor feast © s- (29). dai the SeMlS (17) on the ob © 3? © a Bid © eiaea Hasidgriff (27) of Rafeaan (3) dai dos? Hakaa (13) eiB © & aae ^ o'b ^ a
(33) that this is a © Zapiw © ll © (5) (17) tealiteas g®lag © s? T © ¥ © llemsapf © a (19) ia rersehea (7) amf das feide des? das suadore, ± m Schild K ^ plingoglied (20 ')' EdLt elaen 1 ■ ■ • · * «A * it m 4 * 4 4 · a «a (t · «It · ι t t I · ·· »* ·. · Il 4 ·· β Zapfw © lleu3nippl'jiag to Msprseli I ₉ that the lasstoaiföreigo Eateoa (3) dtsrch mlndestenef a TorecMobbare Wtrnd can be unconditional. 1O _# ZapfwellöBtopplTmg according to inopnaoh 1 _e dadiareh gekisuaaeielmetp ^] dae on the ». Balnea (3) ο d «'BElclittr (12) tmd / orf d ·» SoMId (17) 2a &triorachx> 3i «b © a (31 * 32) an- | brought aiiasi. | 11. PTO clutch according to claim 1,
characterized, that from the driver surfaces (10) of the driver, fingers (9) spherical surfaces or conical surfaces ^ (11) protrude,; and that in that side (22) of the driver ι claws (21) on which the driver surfaces (10) on | are, correspondingly negatively shaped recesses incorporated or molded: are. }