DE1208109B - Control device for a control unit for automatic traction and position control - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

Number:
File number:
Registration date:
Display day:

AOIb

German class: 45 a -65/06

1 208 109
F44033 ΠΙ / 45 a
September 18, 1964
December 30, 1965

The invention relates to a control device for a control device of a hydraulic power lift for automatic tension or position control or combined tension and position control a tillage device attached to an agricultural motor vehicle, in particular a tractor each with one from the pulling force and one from the position of the tillage implement influenced transmitter member and a switchable control rod jointly assigned to both transmitter members to transfer the control impulses to the control unit.

Control devices are already known in which a hand lever with which the lifting and lowering of the attached implement is controlled, either with the on the pulling force or with the can be coupled to the position of the attached soil cultivation implement responsive control system. That Switching from one type of control to the other is carried out by axially moving a switching shaft. The disadvantage of this control device is that it is not switched over during the work process can be. Furthermore, it is not possible to switch to more than two types of tax.

Also known is a control device for automatic traction and position control that has a manually pivotable in a limited range actuator which is attached to one of both of Tensile force as well as position impulses influenced collecting member is applied and along this on a curved path is adjustable. The transmission takes place in each of the two end positions of this actuator pure tensile force or position impulses and the transmission in the entire area between these end positions combined tractive force and position impulses on the control unit with continuously changing ratio of these two components. The actuator is switched with the help of a hand lever pivoted perpendicular to the pulse direction. To set a certain ratio of tractive force and position influence this hand lever must always be brought into the same position, which either by repeated searches must be determined anew each time or which can be fixed by means of special locking means is. Searching for the switch position requires time and, in particular, attention while the Locking means prevent the free shifting of the hand lever. Many operations can furthermore with essentially the same hand lever setting, i.e. the same influence of position and tensile force, be carried out, d. This means that the available setting options are only partially used.

Control device for a control unit for
automatic tension and position control

Applicant:
Xaver Fendt & Co.
Machine and tractor factory,
Marktoberdorf (Allgäu), Weitfeldstr. 31

Named as inventor:

Hubert Müller, Marktoberdorf (Allgäu)

The invention is therefore based on the knowledge that a restriction of the setting options is justifiable, especially if this simultaneously simplifies operation and structure the device is connected. The driver must make the necessary adjustments quickly and above all can do blindly.

The object of the invention is therefore to provide a control device for a hydraulic power lift that can be changed to the desired type of control safely and trouble-free at any time and in which the combined type of control is preset to at least a ratio of tensile force and position influence can be. The control device according to the invention should also be simple in structure and unambiguous be in the service.

The invention solves the problem posed by the fact that the control element and one on this non-rotatably arranged, disc-shaped scanning element existing control rods for transmitting the control pulses slidable in a known manner in the direction of the longitudinal axis of the control member and to Setting the respective type of control is rotatably mounted about this longitudinal axis and that the disk-shaped Sensing member is provided with a recess on part of its surface so that depending on Rotary position of the sensing element either the encoder element of the position control or the encoder element of the tension control rests on the scanning element, while the respective other encoder element has no contact with the scanning element has, or that both encoder members transmit the movement of the scanning member by contact.

According to a further feature of the invention, the scanning member is pivotable on the control member by one Axis stored, which is perpendicular to the axis of rotation of the control member and on the to accommodate the Control impulses exclusively from one of the two encoder

509 760/94

members serving point of attack on the scanning member is directed.

Another feature is that the two encoder members are diametrically opposed to the longitudinal axis of the control element and in those corresponding to the transmission ratio in the combined control mode Distances are arranged from this longitudinal axis.

With the control device according to the invention, a switchover from one is made with simple means Control type achieved on another, whereby each control type is assigned an easily adjustable switch position, which can be reached arbitrarily in one or the other switching direction. Switching can therefore be done in each case take place in the direction that appears to be the most favorable to the driver, without changing from an end position to be disabled. The combined tractive force position control is also preset, so that a control of the ratio set in each case is not applicable. The driver can therefore make the changeover blindly, whereby he can clearly determine the set type of control from the respective position of the shift lever can, since the switch positions are approximately at right angles to each other. This results in addition to one simple structure of the device also an equally simple handling and functionality. Since the If the impulse is only transmitted in the intended switch positions, precise processing is sufficient only the corresponding contact surfaces of the sensing element, while those in between Areas only serve as transition areas. This results in a further simplification of production.

An exemplary embodiment of the invention is shown schematically in the drawing. It shows

F i g. 1 the control device according to the invention installed in the rear of a tractor,

Fig. 2 the control linkage on an enlarged scale,

Fig. 3 view of the scanning member in the direction III-III according to Fig. 2,

F i g. 4 switching position of the sensing element for position control,

F i g. 5 switching position of the sensing element with tension control,

F i g. 6 Switching position of the sensing element with combined position-tension control,

F i g. 7 a control device with two different combined control types,

8 shows the scanning element according to FIG. 7 in view XIII.

In Fig. 1 the rear of a tractor is indicated, to which the lower links 1 are hinged, which are in an articulated connection via lifting struts 2 with lifting arms 3. On the lower links 1 is a soil cultivation device 4, e.g. B. a plow, attached to the coupling 5 of the upper link 6 of the Three-point linkage attacks. The latter stands via an interposed spring 7, which is located in the housing 8 of the tractor is anchored or is supported on this, with a transmitter rod 9 in connection. the Spring 7 can be designed in a known manner as a leaf, spiral or torsion spring. In the case 8, a transmitter member 10 is mounted pivotably about an axis 10 ′ ″ to which the transmitter rod 9 is articulated is. The lifting arms 3 are non-rotatably supported by a lifting shaft 11 which extends transversely through the housing 8 is passed and as a second encoder member z. B. has a curved path 12. The lift shaft 11 is rotated in a known manner by a reciprocating piston 13, so that over the lower link 1, the attached soil cultivation device 4 can be raised and lowered. Of the The reciprocating piston 13 is under the influence of a pressure fluid which flows through a pipe 14 to the cylinder 13 'is supplied and its pressure can be regulated by a control device 15 with a hand lever 16 is, so that the height of the soil cultivation device 4 is adjustable. The hydraulic fluid is taken from a storage container 17 and by a pump 18 and a pressure line 19 to the Control unit 15 is supplied, while the return takes place via a line 20.

In the area of action of the cam track 12 and the encoder element 10 there is a sensing element 21 which is mounted on a control member 23 so as to be pivotable about an axis 22. This control member 23 is with his Longitudinal axis in the direction of action of the two encoder links

ao 10 and 12, d. H. in the impulse direction, and is in this Direction in the housing 8 mounted displaceably. The one bearing point can advantageously lie in the hub 24 of a shift lever 25, with which the control member 23, for example via an elongated hole connection 26 is connected in a rotationally fixed and axially displaceable manner. At the other end of the control member 23 An intermediate lever 27 pivotably mounted on the housing 8 engages an annular stop 23 ′ which actuates the slide 28 of the control unit 15.

A spring 29 searches for the intermediate lever 27 and thus the control linkage 23, 21 to the left (FIG. 1 and 2) to pull. The slide 28 can also be connected to the regulating member 23 so that it can be rotated directly, but is axially fixed The spring 29 also acts directly on the slide 28 in a simple manner.

The sensing element 21 is disc-shaped and lies on the curved path 12 and / or the Encoder link 10 on. In the intended ring-shaped Area, a recess 21 '(Fig. 3) is provided on one side, the deepest point of which is an extension the axis 22 and which decreases steadily increasing on both sides. The recess 21 'can, in order to achieve a smooth transition on both sides, encompass an angular range of up to almost 180 °. On the control member 23, a collar 30 is also provided, which is in abutment with a the lifting shaft 11 attached shift finger 31 arrives, whereby the control member 23 is shifted to the right is and thus the slide 28 is in the switch-off position when the lower link 1 or the soil cultivation device 4 have taken the transport position.

The mode of operation of the control device according to the invention is as follows:

As is known, the desired position is first used for work with the aid of the hand lever 16 To adjust the depth. The shift lever 25 can, for. B. in the in F i g. 1 and 2 are placed, in which the axis 22 lies horizontally and both the cam track 12 and the encoder element 10 rest on the scanning element 21, so that the tensile force and position pulses come into effect at the same time (Fig. 6). If there is an increase in pulling force on the soil cultivation device 4, the associated Pressure increase in the upper link 6, the encoder member 10 pivoting in the counterclockwise direction. As a result of the tensile force of the spring 29, the scanning element 21 follows with its pivot point on the curve

track 12 clockwise to the encoder member 10, the control member 23 by a partial amount as well yields to the left, so that the slide 28 is set to "lift" via the intermediate lever 27. at the subsequent counterclockwise rotation of the lifting shaft 11 pivots the scanning member 21 due to the increasing height of the curved path 12 continues clockwise, but now with a fulcrum on the encoder member 10, whereby a countermovement of the control member 23 is initiated. It can be seen that the scanning element 21 is always both the cam track 12 and the encoder element 10 follows, with partial amounts corresponding to the transmission ratio in the manner of a differential lever these entered movements are transmitted to the control element 23 and thus to the control unit 15 will. The recess 21 'is located in the area between the two encoder members 10 and 12, in the illustrated embodiment according to FIG. 1 and 2 in the area facing away from the Ab ao feeler 21, and is therefore ineffective.

If only the tension control is to be effective, the control element 23 is adjusted with the aid of the switching lever 25 90 ° - in the exemplary embodiment to the front - rotated, the encoder member 10 on the scanning member 21 concern remains. However, the cam track 12 comes into the area of the recess 21 ', so that none Position pulses are passed on (Fig. 5). The axis 22 is now in the line connecting the two Transmitter members 10 and 12. The scanning member 21 can thus be compared to the pulse generation Do not turn control member 23, so that the tensile force pulses over the now rigid connection between control element 23 and scanning element 21 transferred in full size to the former and the control unit 15 are forwarded. The transmission of pure position impulses according to FIG. 4 takes place accordingly, including the transmitter member 23 from the control position according to FIG. 5 must be rotated by 180 °. It is it can be seen that the rotation of the control rod 23, 21 can take place in any direction, with the transition from one type of rule to the other takes place without difficulty at any time. The limit switch in the transport position is guaranteed by the collar 30 for each type of control set. Furthermore, the switching lever 25 can be rotated indefinitely for switching the control linkage 23, 21, where in opposite switching positions pure tension and pure position control and in Opposite switching positions offset at right angles to this, each combined traction force and Position control is adjustable. Appropriately, these switching positions are od by locking. additionally secured so that unintentional adjustment is impossible.

About a certain ratio of the two basic types of control in the combined traction-position control to obtain, the points of application of the cam track 12 and the encoder member 10 in corresponding Distances from the axis of rotation of the scanning member 21 are provided. A certain additional stepless adjustability can also easily, for. B. by moving the encoder member 10 upwards or downwards (FIG. 2) can be achieved, including its pivot axis 10 '"in an elongated hole 35 in the Housing 8 out and can be adjustable via an externally attached handle 36. So that Transmitter rod 9 can swivel unhindered, its implementation through the housing 8 is expedient also designed as an elongated hole.

An embodiment of the invention is also conceivable such that in each of the two opposite switching positions for the combined control mode, the tensile force and position pulses are effective in a different ratio. For this purpose, a head piece with two fingers 10 ′ and 10 ″ of different lengths and at different radial distances from the control element 23 can be provided on the transmitter element 10, one of which in each case comes into effect in a switching position for the combined control mode (FIG The position pulses are expediently also applied to the scanning element 21 via an intermediate piece 12 ', on which a circular path 32 is assigned to the finger 10', a circular path 33 to the finger 10 "and a circular path 34 to the intermediate piece 12 '(Fig. 8th). Depending on the desired transmission ratios, the circular paths 32, 33 and 34 are provided on the scanning element 21 with more or less large distances from one another. The circular paths 33 and 34 each have a recess 33 'and 34', which correspond to the recess 21 'already described, of which the recess 33' extends over two switching areas. The circular path 32 has a raised area 32 '. It can be seen that with position control the intermediate piece 12 'engages at 12'α (FIG. 8), the finger 10 "being ineffective in the recess 33' at 10" α , and with tension control the finger 10 "at 10" b attacks, while now the intermediate piece 12 'at 12' b ineffectively protrudes into the recess 34 '. In the case of one combined control, the intermediate piece 12 'rests on the sensing element 21 at 12' c and at the same time the finger 10 " rests on 10" c.

In the arrangement shown, the influence of the tensile force is greater than the influence of the position. In the other combined control mode, the intermediate piece 12 'at 12' engages d and the finger 10 'on the raised portion 32' at 10 'd, while the finger 10 ineffective "in the elongated recess 33' is located. The setting of the last-mentioned The control mode has a greater influence of the position impulses on the overall control. It is also conceivable to equip the intermediate piece 12 'with two fingers corresponding to the fingers 10' and 10 ", with a fourth circular path being provided on the scanning element 21, for example a raised one Area.

The control device according to the invention can be carried out in a simplified manner so that the scanning element 21 is firmly connected to the regulating element 23. This comes with the combined Type of control in each case the encoder element 10 or 12 in contact with the scanning element 21, which has the greater deflection having. The two transmitter members 10 and 12 therefore do not act in this embodiment simultaneously, but one after the other on the scanning element 21. The transmission of pure tensile force and position pulses and switching from one type of control to another takes place in the one already described way

Claims (8)

Patent claims: 1. Control device for a control unit of a hydraulic power lift for optional automatic Tension control or position control or combined traction and position control of an agricultural vehicle, in particular tractor, cultivated soil cultivation device, each with one of the Tensile force and a sensor element influenced by the position of the tillage implement and a switchable control linkage for transmission that is jointly assigned to both transmitter elements the control pulses to the control unit, characterized in that the one control member (23) and one on this rotatably arranged disc-shaped scanning element (21) existing control rods (23,21) for transmission of the control pulses in a manner known per se in the direction of the longitudinal axis of the control element (23) displaceable and for setting the respective type of control around this longitudinal axis is rotatably mounted and that the disc-shaped sensing element (21) on part of its surface is provided with a recess (21 ') so that depending on the rotational position of the scanning element (21) either the encoder element (12) of the position control or the encoder element (10) of the tension control on the scanning element (21), while the other encoder element (10 or 12) is not in contact with the scanning member (21), or that both encoder members (10 and 12) by contact with transmit the movement of the scanning element (21). 2. Control device according to claim 1, characterized in that the scanning member (21) is pivotably mounted on the control member (23) about an axis (22) which is perpendicular to the axis of rotation of the control member (23) and on which to receive the control pulses exclusively one of the two transmitter members (10, 12) serving the point of attack on the scanning member (21) is directed. 3. Control device according to claim 1 and 2, characterized in that the two transmitter members (10, 12) diametrically to the longitudinal axis of the control member (23) and in the gear ratio in the combined control mode, corresponding distances are arranged from this longitudinal axis. 4. Control device according to claims 1 to 3, characterized in that at least one encoder member (10 or 12) has two encoder fingers (z. B. 10 'and 10 ") arranged at different radial distances from the control member (23), of which in the two switching positions for the combined control mode, one each (10 'or 10 ") for pulse transmission on a correspondingly assigned surface (e.g. at 10" d or 10 " c) of the scanning element (21) is displayed, while the other ( 10 "or 10 ') is ineffective. 5. Control device according to at least one of claims 1 to 4, characterized in that that the encoder member (10) with its axis (10 '") is mounted displaceably perpendicular to the control member (23) and is independently adjustable with a special handle (36). 6. Control device according to at least one of claims 1 to 5, characterized in that that the switching lever (25) for switching the control linkage (23, 21) is unlimited and in both Direction is rotatable, whereby in each case opposite switching positions pure tensile force and pure position control and in opposite switching positions offset at right angles to it each combined traction and position control is adjustable. 7. Control device according to at least one of claims 1 to 6, characterized in that that the control element (23) together with a switching finger (31) of the lifting shaft (11) working collar (30) is axially displaceable and at the same time to switch off the power lift in serves the transport position. 8. Control device according to at least one of claims 1 to 7, characterized in that that the disc-shaped sensing element (21) is fixedly arranged on the regulating element (23). Considered publications:
German Auslegeschrift No. 1166 539,
1129751. 1 sheet of drawings 509 760/94 12.65 © Bundesdruckerei Berlin