JPH0126165Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is designed so that the tilling device can be operated to a desired height relative to the vehicle body simply by swinging the position control lever to a predetermined position.
Moreover, regarding a lifting device for a tiller that can automatically maintain a predetermined set tilling depth regardless of pitching of the vehicle body, etc.
Specifically, the control valve of the hydraulic actuator for raising and lowering the tiller is automatically operated to return it to the neutral position when the height of the tiller relative to the vehicle body reaches a height set based on the rotational position of the rotary shaft for valve operation. A swing-type position control lever is provided with an ease back link mechanism, a spring that urges the rotating shaft toward the downward direction, and a swinging arm that rotates integrally with the rotating shaft to press and swing toward the upward operation side. and an automatic lifting swing link that presses and swings the swing arm toward the lifting operation side when the lever does not act on the swing arm is connected to a ground sensor attached to the tilling device so as to be movable up and down. , the swing arm is linked via a mechanical linkage mechanism so that the swing arm is swung toward the rise operation side as it rises, and the swing arm lift operation of the swing link is operated by the ground sensor. In order to change the maximum sideward swing position, the swing link is pivotally connected to a swing type plowing depth setting lever so that the swing fulcrum is changed as the lever swings.

In such a lifting device, conventionally,
- As disclosed in Publication No. 109507, the swing arm is externally fitted onto a rotating shaft for valve operation,
and a position control lever, and
The plowing depth setting levers are individually pivoted on the vehicle body, but in this case, the swinging arm,
Because the position control lever and tillage depth setting lever are each supported separately on the vehicle body, the support structure becomes expensive and complicated, such as having to drill holes in the vehicle body for a large number of shaft supports. Not only does the arm and both levers have to be assembled to the car body separately, which makes the assembly work to the car body complicated, but also the position control lever and plowing arm have to be attached to the swing arm. Since the depth setting lever is supported on a separate shaft, due to assembly errors with the car body, it is necessary to set the height relative to the car body using the position control lever, and the plowing depth setting lever Another problem was that it was difficult to set the plowing depth accurately.

In view of the above-mentioned circumstances, the purpose of the present invention is to simplify the structure and facilitate assembly through simple modifications, as well as to accurately set the height relative to the vehicle body and the plowing depth. The aim is to make it possible to

The characteristic configuration of the present invention is that, in the above-mentioned elevating device for a power cultivator, the swing arm is rotatable as a unit, and the position control lever and
The extension shaft supporting each of the tillage depth setting levers so as to be relatively rotatable is connected to the valve operating rotation shaft so as to rotate integrally therewith.

Next, the effects of the feature configuration of the present invention will be described.

In other words, the swing arm, position control lever, and plowing depth setting lever are all supported on an extension shaft that is connected to the valve operating rotation shaft so that they rotate integrally. It is only necessary to configure the support structure, and by simply assembling one extension shaft to the vehicle body, the swing arm and both levers can be assembled. The relative positions of the control lever and the plowing depth setting lever are
It can be determined accurately based on one extension axis.

Due to the above-mentioned effects, it is possible to simplify the structure and facilitate assembly, and also improve assembly accuracy so that height relative to the vehicle body and plowing depth can be set accurately. It is possible to solve the disadvantages of the conventional structure mentioned above,
An elevating device for a tiller that can be used more conveniently has been obtained.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a rotary tiller 4 is mounted at the rear of a passenger vehicle equipped with a driver's seat 1 via a three-point linkage device consisting of left and right lower links 2, 2, and an upper top link 3. The left and right lift arms 6, 6, which are connected and vertically oscillated relative to the vehicle body by a single-acting hydraulic cylinder 5, are interlocked and connected to the left and right lower links 2, 2 via lift rods 7, 7. , a riding-type tiller is constructed.

As shown in FIG. 2, the control valve 8 of the lifting hydraulic cylinder 5 is arranged at the lower part of the cylinder storage case 9, and the slide spool 8A of the valve 8 is moved to the lowered position D, the neutral position N, and the raised position. Rotary shaft 10 for valve operation for switching to position U
is supported through the right side wall of the storage case 9. A spool operating lever 11 is pivotally supported at the end of the spool 8A so as to be able to swing back and forth, the upper end thereof is integrally rotatably connected to the rotating shaft 10, and the lower end is connected to the right end of the spool operating lever 11 with a ball joint. a control arm 12 connected via;
A feedback rotating shaft 13, which includes an arm 13A connected to the left end of the spool operating lever 11 via a ball joint, and is supported through the left side wall of the storage case 9, and a case for the rotating shaft 13. Feedback lever 13B attached to the outer end
A feedback link mechanism 15 consisting of a feedback rod 14 is provided which interlocks and connects the control valve 8 and the left lift arm 6.
is configured so that it can be automatically operated to return to the neutral position N when the height of the tilling device 4 relative to the vehicle body reaches a height set based on the rotational position of the rotary shaft 10 for valve operation.

As shown in FIGS. 2 and 3, the extension shaft 16
is externally connected to the end of the valve operating rotating shaft 10 so as to rotate integrally therewith, and is provided so as to protrude through a reinforcing plate 17 bolted to the storage case 9. A tension spring 18 biasing toward the lowering operation side is provided so as to act on the extension shaft fixing bolt 19. A swing arm 20 to be rotated integrally with the rotating shaft 10 is fitted onto the extension shaft 10 and fixed by a spring pin 21 so as to rotate together with the extension shaft 10, and is fitted onto the extension shaft 16 so as to be relatively rotatable. A position control lever 23 and a plowing depth setting lever 24 are respectively fitted onto the cylinder shaft 22 so as to be relatively rotatable. Further, a plurality of fixing plates 27 are provided which are slidably fitted onto each of the cylindrical shaft 22 and the cylindrical body 26 which is fitted onto the bolt 25 connected to the reinforcing plate 17. A plurality of washers 28 for frictionally holding the levers 23, 24 can be maintained at a desired swing position.

Then, the position control lever 2
3 is equipped with a locking pin 30 that presses the swinging arm 20 upward, and when the position control lever 23 is operated to swing, the height relative to the vehicle body is set based on the swinging position. Tillage device 4
It is configured so that it can be raised and lowered automatically.

Further, in a state in which the position control lever 23 is greatly swung toward the lowering side and switched to a state in which no action is applied to the swiveling arm 20, the swiveling arm 20 is pressed and swung toward the raising operation side. A ground sensor 32 which also serves as a ground leveling plate has a link 31 pivotally connected to the tilling device 4 so as to be vertically swingable.
The sensor 32 is connected via the push-pull rod 33, the relay swing link 34, and the push-pull type wire 35 so that the higher the sensor 32 is, the more the swing arm 20 is swung toward the upward operation side. The swing link 31 operated by the sensor 32
In order to change the maximum swinging position to the swinging arm raising operation side, the swinging link 31 is pivoted to the plowing depth setting lever 24 so that the swinging fulcrum P is changed as the lever swings. However, even if the plowing depth changes due to pitching of the vehicle body, the ground contact sensor 32
The tilling device 4 is automatically raised and lowered to maintain the set plowing depth based on the vertical swing of the plowing depth, and as shown in FIG. It is possible to change the settings.

The position control lever 23 is operated to the maximum descending range Da, and the plowing depth setting lever 24 is moved to the maximum descending range as shown in FIG.
In the state operated to Db, the control valve 8 can be maintained at the lowered position D even if the lift arm 6 is lowered to the maximum, and in this state, the tilling device 4 is supported on the ground, so-called. This makes it possible to create a floating work state. Further, a connecting portion of the wire 35 to the swing link 31 is provided to prevent the tilling depth setting lever 24 from being accidentally operated to the upward side when the tilling device 4 is raised to the maximum and the ground sensor 32 is lowered to the maximum. A long hole S is formed for connection and accommodation.

Next, another embodiment will be described based on FIGS. 5 and 6.

That is, a small-diameter cylindrical shaft 36a for pivoting the swing link 31 is fitted onto the extension shaft 16 so as to be relatively rotatable, and an arm 38 for operating the swing arm 20 using a locking pin 37 is supported. Large diameter cylinder shaft 3
6b is externally fitted onto the small diameter cylindrical shaft 36a so as to be relatively rotatable, the position control lever 23 is externally fitted onto the large diameter cylindrical shaft 36b, and the plowing depth setting lever 24 is integrally and rotatably fitted onto the small diameter cylindrical shaft 36a. I have them put on their clothes. Then, a bottomed cylindrical cover 39 that covers the swinging arm 20 that rotates integrally with the extension shaft 16, the swinging link 31, and the mounting portion of the locking pin 37 is installed.
While bolting it to the cylinder storage case 9,
A lid body 39A that closes the opening of the cover 39 is fitted around the large-diameter cylindrical shaft 36b so as to be relatively rotatable, and is also used as a reinforcing frame for the extension shaft 16. Furthermore, the bolts 4 attached to each of the levers 23 and 24 are
0 and 40 are engaged with the lever fixing plate 41, and a lever holding disc spring 42 that presses the fixing plate 41 is supported by the bolt 40.

In carrying out the present invention, the mechanical linkage mechanism linking the swing link 31 and the ground sensor 32 may be constructed using the wire 35, the relay swing link 34, and the push/pull rod 33, and may be modified in various ways.

Further, the specific structure for connecting the extension shaft 16 to the rotating shaft 10 so as to rotate integrally therewith, and the specific structure for supporting the extension shaft 16 can also be modified in various ways.

[Brief explanation of the drawing]

The drawings show an embodiment of the elevating device for a power cultivator according to the present invention, in which Fig. 1 is a side view showing the rear part of the riding type cultivator, Fig. 2 is a schematic diagram of the elevating device, and Fig. 3 is an attachment of an extension shaft. Partially cutaway rear view showing the section, Fig. 4A,
B and C are side views showing the operating state of the tillage depth setting lever, FIGS. 5 and 6 each show another embodiment, FIG. 5 is a partially cutaway rear view, and FIG. 6 is a side view. It is a diagram. 4... Cultivating device, 5... Fluid pressure actuator for lifting and lowering, 10... Rotating shaft for valve operation, 15...
Feedback link mechanism, 16...extension shaft, 1
8... Rotation shaft biasing spring, 20... Swing arm, 23... Position control lever,
24... Lever for setting plowing depth, 31... Swing link for automatic lifting, 32... Ground sensor, 33,3
4, 35... Mechanical linkage mechanism, P... Swing fulcrum,
N...Neutral position.

Claims (1)

[Scope of utility model registration request] The control valve 8 of the hydraulic actuator 5 for raising and lowering the tiller is automatically operated to return to the neutral position N when the height of the tiller 4 relative to the vehicle body reaches a height set based on the rotational position of the rotary shaft 10 for valve operation. In addition to providing a feedback link mechanism 15 to
Spring 1 that urges the rotating shaft 10 downward
8 is provided, and a swing type position control lever 23 is provided to press and swing the swing arm 20 that rotates integrally with the rotating shaft 10 toward the upward operation side, and the lever 23 does not act on the swing arm 20. In this state, an automatic lifting swing link 31 that presses and swings the swing arm 20 toward the lifting operation side is connected to a ground sensor 32 attached to the tilling device 4 so as to be able to move up and down. The swing arm lift operation side of the swing link 31 is linked via mechanical linkage mechanisms 33, 34, and 35 so that the arm 20 is swung toward the rise operation side, and is operated by the ground sensor 32. In order to change the maximum swing position of the tiller, the swing link 31 is pivoted to a swing-type plowing depth setting lever 24 so that the swing fulcrum P is changed as the lever swings. This is a lifting device in which the swinging arm 20 is integrally rotatable, and the position control lever 23 and the plowing depth setting lever 24 are provided.
The extension shaft 16 which supports each of the
An elevating device for a tiller, characterized in that it is connected to the valve operating rotary shaft 10 so as to rotate integrally therewith.