DE3206756A1 - Device for the connection to a vehicle of at least one stabilizing strut for the lateral stabilization of the lower links of a three-point linkage - Google Patents

Abstract

To achieve a kinematic length variability of stabilizing struts for the lateral stabilization of the lower links of a hydraulic three-point linkage on farm tractors or traction engines, without these needing to be changed over at the connection end or without bolts and retaining devices having to be changed over, the point of articulation of the stabilizing strut is guided on a circular path by a rocker mounted so as to be pivotable to a limited extent in a bearing block fastened to the tractor. The rocker can be locked in two end positions by bearing against one of two bearing faces terminating a guide face taking the form of a segment of a circle, with the result that two different initial positions of the stabilizing strut are obtained, so that the lower links can be set rigidly in the lateral direction in different pivoting positions. In one embodiment, the rocker is formed by two discs which are arranged rotatably on a bearing bolt and are connected to one another at a distance and of which the circular contour form is interrupted over less than half their circumference by congruent recesses which have the bearing faces for a retaining bolt in one of the two end positions. In another embodiment, the rocker is designed as a spring-loaded lever.

Description

Device for the vehicle-side connection of at least one stabilization

strive for the lateral stabilization of the lower links of a three-point linkage The invention relates to a device for the vehicle-side connection at least a stabilizing strut for the lateral stabilization of the lower links of a hydraulic Three-point linkage on farm tractors or tractor units.

The attachment to an agricultural tractor is mainly done via the hydraulic three-point linkage, which has the upper link and the lower link. For the road transport of work equipment, but also for short-term lifting It is important to determine the lateral mobility of the lower links, as they are on the tractor side Connection ends are connected to the tractor via ball joints and thus laterally One on one is used for the lateral rigid position of the lower link the lower link engaging the stabilizing strut, the tractor side mostly coaxial also connected to the common pivot axis of the lower links via a ball joint is.

The effect of side stabilization through a stabilizing strut is not the same size over the entire lifting range of the lower link. Sometimes leaves Lateral stabilization of the lower links is only possible in the raised transport position achieve. In order to be able to rigidly position the lower links in the rest of the lifting area as well, additional locking devices must be provided.

From DE-AS 12 73 247 a device for lateral stabilization is the lower link is known, in which a telescopic stabilizing strut with their part engaging the lower link in a backdrop, inevitably for the lateral flexibility of the lower link variable in length and for lateral stabilization the lower link is moved invariably in length. For lateral stabilization here in the backdrop one arranged on the handlebar-side part of the stabilizing strut Pin set, during this with intended lateral mobility of the lower links can slide back and forth in a recess in the backdrop.

In this known device, the backdrop is against the restoring force a spring can be pivoted to a limited extent. To also in a subscript of the backdrop for side stabilization the ancestral link in one of their deeper working positions the stabilizing strut To be able to set, the backdrop must be fixed by means of a locking device will. A cumbersome unplugging of bolts and fuses is required for this. The one for fixing the stabilizing strut and for the one in the locking device used pins of relatively small diameters are subject to Occurring pressure and tensile loads on the lower links of a high surface pressure and, in conjunction with the link guide, can lead to play, jamming and wear to lead.

In addition, in the device known from DE-AS 12 73 247 the stabilizing strut can be rotated around an axis fixedly mounted on the tractor, As a result, they cannot be changed in length in any fixed position is.

The invention is based on the object of the vehicle-side connection, 3 to design the stabilizing strut so that it is easy to use and quick to use A kinematic variability in length of the stabilizing strut is possible without being repositioned at the connection end or the bolts and fuses will need.

According to the invention, this object is achieved in that the articulation point the stabilization strut by a limited pivoting movement in one on the tractor attached swing arm mounted on a circular path mityeführ, and that the rocker arm in two end positions by resting on one of two one circular segment-shaped End running guide surfaceIlden contact surfaces can be locked.

Because the articulation point of the stabilizing strut is on a circular path is carried along and can be locked in two end positions, there are two different ones Starting positions of the stabilizing strut to keep the lower links in different positions Pivoting positions, for example in the raised transport position and in each lowered working position, to be able to stand rigidly at the side. In the one The pivot point is the pivot position corresponding to the end position of the swing arm the stabilizing strut higher up and forward than in the other pivot position corresponding end position.

By carrying the articulation point on the swing arm, the The stabilization strut storage on the tractor side is always preserved, i.e. the storage does not need to be removed, repositioned and reattached. Is one up to Remote control is provided for the tractor driver, which the driver needs when changing over not to get off the tractor.

In an advantageous embodiment of the invention, the rocker is from two rotatably seated on a bearing pin, connected to each other at a distance Discs formed whose circular outline shape is less than half theirs Perimeter is interrupted by congruent recesses, which the contact surfaces for a safety bolt in one of the two end positions.

A quick adjustment device reaches raan when the safety bolt Stationary rotatably mounted in the bearing block and on one side of the layer block protrudes and is connected there with a hand lever.

In one embodiment of the device according to the invention the contact surfaces for the safety bolt of two angularly offset by 1200, Opened bores formed by the guide surface running in the shape of a segment of a circle are connected. With respect to the circular area of the disks are the open bores arranged so that it is optionally brought into congruence with the safety bolt can be.

The point of articulation of the stabilizing strut is located diametrically to the guide surface running between the open holes so that ever after the selected end position of the rocker arm, the pivot point is in one of two positions comes to lie, which are angularly offset by 1200 within the rocker.

The rocker arm is locked in one of its two by the locking bolt End position locked. To release the lock, the safety bolt is open a circumferential length corresponding to the opening angle of the opened holes in the areas interacting with the opened bores and the guide surface flattened, for example provided with curved flats in the groove base, whose radius of curvature runs radially outwards and the radius of the circular segment running guide surface is adapted by turning the locking bolt by means of of the hand lever, the flats get outside the area of the circular segment extending guide surface, so that the rocker by means of the stabilizing strut can be rotated and brought into the other end position, in which then the securing bolt is pivoted back into its locking position via the hand lever.

According to a further embodiment of the device according to the invention the rocker arm is designed as a lever which has limited pivoting movement at one end is mounted on the bearing pin carried by the bearing block and at its free end a pin forming the articulation point of the stabilizing strut on the tractor side has, on which a retaining spring engages that the bolt in the two end positions of the point of articulation in over-dead-point layer geyen which runs in the shape of a segment of a circle Holds the guide surface closing contact surfaces.

It results from this when the stabilization is subjected to pressure strive for a simple mounting of the tractor-side connection end of the stabilizing strut and a sufficient locking due to the on the pivot point against the respective Positioning surface of directed pressure in the stabilizing strut caused by the tensile force the retaining spring acting on it is supported.

In an advantageous embodiment, the contact surfaces are designed to be towards the rear Formed semicircular surfaces protruding from the guide surface, the radius of curvature of which is adapted to the radius of the bolt.

These contact surfaces as well as the one that runs in the shape of a segment of a circle Guide surfaces are provided on the back of the bearing block, whereas the retaining spring in the bisector of the two end positions on the front of the bearing block is supported.

Two exemplary embodiments of the illustrated in more detail in the description Apparatus according to the invention are shown in the drawing. It shows Fig. 1 is a plan view of the rear part of an agricultural tractor with the attached thereto attached three-point linkage and the stabilizing strut, Fig. 2 is a schematic held side view of the device with rocker arm, pivot point and safety bolt, Fiy. 3 shows a section along the line III-III in FIG. 2 through the device according to FIG Fiy. 2, the point of articulation for the stabilizing strut above the swing arm mounting assumed and the locking bolt is shown rotated by 900, Fiy. 4 one Side view of the device in a modified embodiment.

As FIG. 1 shows, one is on the rear axle housing 1 in more detail Agricultural tractor not shown in detail on pivot axes 2 lower links 3 articulated connected, the rear ends of which are connected to one another via a drawbar 4 are. For the fixed position of the lower links 3 in a lower working position and in a raised transport position is a stabilizing strut 5, which with their rear end in the direction of travel via a socket pin 6 on one of the lower links attached and with its front end in one on the axle funnel of the tractor arranged bearing block 7 is supported.

According to the embodiment of FIG. 2 is the stabilizing strut 5 in the bearing block 7 on a rocker which can be rotated to a limited extent within the bearing block 8 hinged. For this purpose, the bearing block 7 consists of two side plates 9, 10, which have a circular outline shape over an arc length of approximately 220 degrees and on the remaining arch length run out into a horizontally running fastening edge, with which the side plates are at a distance from one another on one on the axle funnel of the tractor screwable mounting plate 11 are attached for example by welding. The bearing block is located on the side that runs obliquely upwards to the fastening plate 11 covered by a plate 12 extending between the side plates 9, 10 and protected against dirt.

This plate 12 has the circular shape of the rocker 8 in its outlet adapted so that pinching points are avoided and rain and spray water at the outlet can run freely.

The side plates 9, 10 of the layer block 7 are in the middle with one another aligned bores 13 for receiving a bearing pin 14 are provided.

Furthermore, the front and in the attached state are off-center Lower circle section bores 15 for receiving a securing bolt 16 are provided.

Au £ the bearing pin 14 is between the side plates 9, 10 of the bearing block 7 provided for the connection of the stabilizing strut 5 Swing arm 8 freely rotatable. This rocker consists of two discs 17, 18, which through a U-shaped curved shell 19 centered at a distance from one another and against the side plates 9, 10 of the bearing block are held. The shell 19 surrounds this with a little distance partially the bearing pin 14.

As FIG. 2 shows, the disks 17, 18 are along an angle a of 1200 of its otherwise circular circumference with a locking of the swing arm by means of the securing bolt 16 in two Endstellurçen enabling recess provided, which consist of two open bores 20, offset at an angle of 1200 21 and a Fükrunys surface running in the shape of a segment of a circle between these bores 22 exists. The on about 120 in the direction of the limited by the guide surface 22 Part of the recess have bores 20, 21 open with respect to the center point of the disks 17, 18 such a radial distance that they match that in the side plates 9, 10 of the bearing block 7 provided hole 15 for the securing bolt 16 in the cover layer can be brought.

The radius of the guide surface 22 running in the shape of a circular segment is smaller than the radial distance between the centers of the open holes 20, 21 to the center of the panes, but larger than the distance between the holes themselves to the center of the discs.

Diametrically to the one running between the open bores 20, 21 EXhIrurwsfläche 22 are the disks 17, 18 of the rocker 8 with each other aligned Bearing bores 23 are provided which receive a bolt 24, which is exclusively through the side plates 9, 10 of the bearing block 7 secured axially and thus captive is arranged and the one formed as a ball joint 25 between the disks 17, 18 Articulation point for the stabilizing strut 5 receives. Through their articulation over a ball joint, the stabilizing strut is pivoted on the bolt 24, so that it can follow the movements of the lower links.

Depending on the position of the lower links, the rocker 8 can be between two End positions are rotated, creating a further down and back Articulation point for the stabilizing strut or a further above and in front Articulation point results. Has the rocker been rotated so that the pivot point is further up and further forward as seen in the direction of travel, then is the stabilizing strut kinematically shortened in relation to the other pivot position of the rocker.

In the two end positions of the rocker arm this can be averaged lock a quick adjustment device 26, whereby the Stabilisierunysstrebe as well as the lower links are fixed in their lateral mobility. To this end the securing bolt 16 is used when, as FIG. 2 shows, with its full cross section is in the open Bohrund 21.

To unlock the safety bolt 16 and after pivoting the rocker 8 clockwise in FIG. 2 at 1200 the other open bore 20 with the securing bolt The locking bolt in the area of the washers is able to engage 17, 18 of the rocker 8 on one of the opening angle of the holes 2Q, 21 corresponding Circumferential length flattened. These flats 27 can be designed as running transversely to the bolt axis Flat grooves or, as FIG. 2 shows, in the groove base with a curvature be provided, the radius of curvature extending radially outward and the radius corresponds to the guide surface 22 running in the shape of a segment of a circle.

The securing bolt 16 protrudes laterally outside in one side plate 17 of the bearing block 7 and carries a hand lever on the outer end face 28, wherein between the hand lever 28 and the outer surface of the side plate 17 a Intermediate disk 29 is placed on the protruding end of the locking bolt.

Fig. 3 shows the section through the rocker along the broken Line III-III in Fiy. 2, if the open bore 20 located at the top in FIG. 2 with the locking bolt 16 cooperates and in this pivot position of the rocker the bolt 24 for receiving the stabilizing strut, as shown in dashed lines in FIG indicated, located in the uppermost position.

In Fiy. 3 is still the securing bolt 16 and the one on it At the beginning of the planned Alflachungen 27 shown offset by 900 to the position of the Flattening in relation to the guide surface 22 running in the shape of a segment of a circle to clarify.

The securing bolt is located between the disks 17, 18 of the rocker arm 8 16 surrounded by a leg spring 30, one end of which is rotatably fixed in an outside the hole 15 for the securing bolt in one side plate 10 of the bearing block arranged plug-in bore 32 is supported.

The other end of the leg spring 30 is held by the securing bolt.

and taken along as it rotates. This is in the immediate vicinity the left in Fig. 3 disk 17 of the rocker 8 and in the area of the effective there Flattening a transverse bore 31 extending radially through the securing bolt is provided, into which a clamping sleeve 33 is inserted of such a length that when used a washer an additional axial fixation of the locking bolt achieved will.

In the pivoting range of the hand lever 28 is laterally outside the in Fig. 3 left side plate 9 of the bearing block 7, a stop bolt 34 in front. Normally the pretensioned leg spring 30 of the hand lever 28 against the stop bolt 34 held. In this position, the locking bolt 16 is with his full cross-section in interlocking Position with one of the two open bores 20 or 21, in Fig. 2 for example with the lower bore 21. The curved groove bottom of the flats 27 is here tangential to the outside directed.

The hand lever 28 then takes a direction towards the center of the rocker 8 Position.

If the rocker is to be swiveled into the other end position, the locking by the safety bolt is released by turning the hand lever 28 in Fig. 2 by 900 counterclockwise and against the action of the leg spring 30 is rotated, whereby the groove bottom of the flat 27 on the center of the Swing arm is directed. Using the stabilizing strut, the swing arm is now 8 twisted. The guide surface 22, which runs in the shape of a segment of a circle, slides the disks 17 and 18 with a little distance past the groove bottom of the flats 27, until the other open hole is aligned with the hole for the safety bolt. The hand lever can now be released or brought into its stop position.

In the embodiment of FIG. 4, a lever is used as a rocker arm 8 4.1 used, the one end rotatable on the supported by the bearing block 7 Bearing pin 14 is mounted and has a pin 42 at its other free end, on which the stabilizing strut 5 is pivotally connected via the ball joint is. The articulation point of the stabilizing strut is in this variant also carried on a circular path and thereby locked in two end positions, that the circular segment-shaped Fünrungsfläche 22 on the back of the Bearing block is provided along which when the lever is pivoted 41 the bolt 42 with a ball joint can roll over an arc length of about 900. the Guide surface 22 ends at the top and bottom in semi-circular contact surfaces protruding to the rear 43, 44, the radius of curvature of which is adapted to the radius of the bolt 41.

At the bolt 41 engages a substantially forwardly pretensioned Retaining spring 45, which is in the bisector of the two end positions supported on the front of the bearing block. When the stabilizing strut is subjected to pressure the retaining spring 45 keeps the lever 41 always in one of the two end positions, which represents an over-center position for the force effect of the retaining spring. When the stabilizing strut is subjected to tensile stress, the end position provided in each case can be used of the articulation point of the stabilizing strut can be set using locking pins.

As FIG. 4 shows, there is also one in this embodiment variant Kinematic shortening of the stabilizing strut when the one acting as a rocker Lever 41 shows the position shown in full lines, directed upwards and backwards has taken, in which there is an articulation point further above and in front of the Stabilization strut results. In the dash-dotted lines, down and At the rear facing position of the lever 41, the bolt 42 is supported on the guide surface 22 from the bottom final semicircular system 44, whereby the stabilizing strut is kinematically extended.

The one when you move the lever from one pivot position to the other The required actuating forces are only provided by the retaining spring when the linkage is free of tension certainly.

Claims (21)

Claims 1. Device for the vehicle-side connection at least a stabilization strut for the lateral stabilization of the lower links of a hydraulic Three-point boom on agricultural tractors or tractors, characterized in that that the articulation point of the stabilizing strut (5) is pivotable to a limited extent in a bracket (7) attached to the tractor swing arm (8) mounted on a Circular path and that the rocker (8) in two end positions by plant on one of two guide surfaces (22) terminating in the shape of a segment of a circle Contact surfaces is lockable. 2. Apparatus according to claim 1, characterized in that the rocker (8) of two rotatably seated on a bearing pin (14), spaced from each other connected disks (17, 18) is formed, the circular outline shape on less than half of its circumference is interrupted by congruent recesses is which the contact surfaces for a locking bolt (16) in one of the two Have end positions. 3. Apparatus according to claim 2, characterized in that the securing bolt (16) rotatably mounted in a stationary manner in the bearing block (7) and on one side of the bearing block protrudes laterally and is connected there to a hand lever (28). 4. Apparatus according to claim 2, characterized in that the discs (17, 18) have recesses along an angle of 1200 on the circumference. 5. Apparatus according to claim 2, characterized in that the contact surfaces for the safety bolt (16) in one of the two end positions down of two by 120 Angularly offset, open bores (20, 21) are formed through the guide surface (22) running in the shape of a circular scraper are connected. 6. Vorrichtun4 according to claim 5, characterized in that the open Bores (20, 21) such a radial distance from the center point of the disks (17, 18) of the rocker (8) have that they penetrate with the bearing block (7) Securing bolts (16) can optionally be brought into cover position. 7. Apparatus according to claim 5, characterized in that the radius the circular segment-shaped guide surface (22) is smaller than the radial one Distance of the center points of the opened Bohrunyen (20, 21) to the center point of the disks, and is greater than the distance between these holes themselves and the center of the disks (17, 18). 8. The device according to claim 2, characterized in that the the Ball joint (25) of the stabilizing strut (5) receiving bolts (24) diametrically to the guide surface (22) running between the open bores is. 9. Apparatus according to claim 8, characterized in that the bolt (24) near the unfany of the disks of the rocker arm (8) between the disks is arranged in bearing bores (23) provided in them. 10. Apparatus according to claim 5, characterized in that the securing bolt on a longitudinal length corresponding to the opening angle of the bores (20, 21) in the cooperating with the bores (20, 21) and the guide surface (22) Areas is flattened. 11. The device according to claim 10, characterized in that the Flats (27) are designed as grooves running transversely to the bolt axis. 12. The device according to claim 11, characterized in that the The groove base of the flats (27) is even. 13. The apparatus according to claim 11, characterized in that the The groove base of the flats (27) is provided with a curvature, the radius of which is of curvature extends radially outwards and the radius of the circular segment-shaped Guide surface (22) is adapted. 14. The device according to claim 2, characterized in that the securing bolt (16) between the discs (17, 18) of the rocker arm (8) by a leg spring (30) is surrounded, one end of which is on the bearing block (7) and the other end of which is supported on the securing bolt (16). 15. The device according to claim 14, characterized in that the one end of the leg spring (30) in a radially penetrating the securing bolt Transverse bore (32) can be inserted. 16. The device according to claim 14, characterized in that the Securing bolt via the stop bolt protruding from the outside of the bearing block (7) (34) hand lever held in contact k8) normally in the locked position is held and against the action of the leg spring (30) in the unlocked position is rotatable. 17. The device according to claim 1, characterized in that the rocker (8) is designed as a lever (41), one end of which can pivot to a limited extent is mounted on the bearing pin (14) carried by the bearing block (7) and on his free end of the articulation point on the tractor side of the stabilizing strut (5) forming bolt (42) on which a retaining spring (45) engages, which the Bolts (42) in the two end positions of the articulation point in tibertotpunktlage against the contact surfaces streaking the guide surface (22) running in the shape of a circular segment (43, 44) holds. 18. The device according to claim 17, characterized in that the Contact surfaces (43, 44) as a semicircular protruding rearward from the guide surface (22) Surfaces are formed, the radius of curvature of which fits the radius of the bolt (41) any is. 19. Device according to claims 17 and 18, characterized in that that the guide surface (22) extending in the shape of a segment of a circle and the ones delimiting them Contact surfaces (43, 44) are provided on the rear of the bearing block (7). 20. The device according to claim 17, characterized in that the Lever (41) can be pivoted about 900 uln. 21. The device according to claim 17, characterized in that the Retaining spring (45) in the bisector of the two end positions on the front of the bearing block (7) is supported.