JPH0132807Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention connects a ground work device to a traveling aircraft via a hydraulic actuator so that it can be driven up and down, and connects the operating shaft for the control valve of the hydraulic actuator with an O-ring externally from the case. A valve operating arm that is rotatably protruded in a sealed state through a valve operating shaft and is integrally rotatably attached to the protruding operating shaft is connected to a link that is pivotally connected to a ground level setting lever that can be swung and fixed. ,
A swinging ground sensor that detects the ground level of the working device is linked with the link, and the control valve is switched by the swinging of the sensor to maintain the ground level of the working device within a set range. The present invention relates to a lifting control mechanism for a ground work vehicle constructed as follows.

Conventionally, in order to provide a ground level setting lever in the above, a support shaft is attached to the axle case or transmission case at a location different from the protruding operation shaft, and the plowing depth setting lever is loosely fitted onto the support shaft. At the same time, a friction plate, a fixed plate, and a spring were installed.

However, since two shafts are mounted in a narrow space, the mounting structure becomes complicated.

In addition, as pressing force is applied to the valve operating arm on the protruding operating shaft, the entire operating shaft rotates while being pressed in one direction, and the load concentrates on a part of the circumference of the O-ring, causing the O-ring to The problem was that it wore out quickly.

In view of the above points, it is an object of the present invention to simplify the mounting structure and to effectively prevent early wear and tear of the O-ring.

In order to achieve the above object, the present invention provides the aforementioned elevation control mechanism for a ground work vehicle, in which the setting lever is loosely fitted onto the protruding operating shaft, and the setting lever is frictionally fixed to the protruding operating shaft. A fixing plate and a friction plate are loosely fitted together, a bullet for applying a frictional force is attached, and a supporting member rotatably supporting the proximal end side of the protruding operation shaft is attached to the case, The present invention is characterized in that a rotation preventing member that penetrates the fixed plate and prevents its rotation is provided in a protruding manner on the supporting member in parallel with the operating shaft.

In other words, by using the protruding operating shaft and attaching the plowing depth setting lever and a member for frictional fixation thereto, it has become possible to simplify the mounting configuration for the plowing depth setting lever.

Moreover, the proximal end side of the protruding operating shaft is supported by the supporting member, thereby allowing the supporting member to bear part of the load accompanying the rotation of the operating shaft, reducing the unbalanced load applied to the O-ring, and It is now possible to prevent premature wear and tear.

Furthermore, since the rotation prevention member is not only attached to the fixed plate using the support member, but also the rotation prevention member is passed through the fixed plate, the operating shaft can also be controlled by the abutting support of the rotation prevention member against the fixed plate. As a whole, the mounting configuration can be further simplified, and the load applied to the O-ring from the operating shaft can be further reduced, thereby making it possible to better prevent wear and tear on the O-ring.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative drawings.

A three-point link device 3 consisting of a top link 1 and a pair of left and right lower links 2 is provided at the rear of the traveling aircraft.
The rotary tilling device 4 is connected via the
Driven by a single-acting hydraulic cylinder 5, which is an example of a hydraulic actuator, lift arms 6, 6, which can freely swing up and down, and left and right lower links 2, 2 are connected via lift rods 7, 8, and a riding type tiller is constructed. It is configured.

The single-acting cylinder 5 has a transmission case 9.
A control valve 11 for the cylinder 5 is installed in the lower part of the cover case 10.

As shown in FIG. 2, a spool operating arm 13 is pivotally connected to the end of the spool 12 of the control valve 11 so as to be rotatable around a vertical axis P, and a lever shaft is provided on either the left or right side of the cover case 10. 1
4, and an operating shaft 15 is provided on the other hand in a state that the lever shaft 14 and the lift arm 6,
6 is interlocked and connected via a feedback rod 16, and the protruding operating shaft 15 is linked to a position lever 17, a plowing depth setting lever 18 as a ground level setting lever, or a ground sensor 19. As the cylinder 5 is actuated and the lift arm 6 is raised and lowered in accordance with the rotation, the lever shaft 14 is rotated to the neutral return side of the control valve 11, and cultivation is performed at a height corresponding to each rotational phase of the protruding operation shaft 15. A feedback control mechanism 20 is configured to stop the device 4.

The protruding operation shaft 15 has a case side shaft portion 15a.
A boss member 21 connected to the end of the extended operation shaft 15b is screwed and separably connected, and is fixed in phase with a set bolt 22 attached to the boss member 21. . Lock nut 23 of set bolt 22 and boss member 2
An angled bracket 24 is attached between the valve 11 and the cover case 10, and urges the protruding operating shaft 15 to rotate the valve 11 toward the lowering operation side of the tilling device 4. A tension spring 25, which is an example of a bullet, is tensioned.

As shown in FIG. 2, a valve operating arm 26 is attached to the extended operating shaft 15b so as to be integrally rotatable with a pin connection, and a cylindrical support having a first fixing plate 27a connected to one end thereof. The member 28 is loosely fitted.

The cylindrical support member 28 includes a first friction plate 29a,
The mounting arm 18a of the plowing depth setting lever 18, the second friction plate 29b, and the second and third fixing plates 27b, 2
7c, the third friction plate 29c, the mounting arm 17a of the position lever 17, the fourth friction plate 29d, and the fourth fixing plate 27d are loosely fitted in that order, and fixed to both the mounting arms 17a and 18a. A compression coil spring 30 is attached as a spring that provides a frictional force.

At the end of the extension operation shaft 15b on the boss member 21 side, a cylindrical boss 32 connected to the support member 31 is loosely fitted, and the support member 31 is integrally attached to the side surface of the right axle case 33, Further, a rotation prevention member 34 is protruded from the support member 31 in parallel with the protruding operation shaft 15, and the rotation prevention member 34 is connected to the first to fourth fixing plates 2.
7a, 27b, 27c, 27d, and the first to fourth fixing plates 27a, 27
The rotation prevention member 34 is used not only to prevent rotation of the shafts b, 27c, and 27d, but also to reinforce and support the operating shaft 15 in cooperation with the cylindrical boss 32.

A bracket 35 is connected to the mounting arm 18a of the plowing depth setting lever 18, and a link 36 is pivotally supported on the tip side of the bracket 35 so as to come into contact with the valve operating arm 26 when the bracket 35 swings. The link 36 and the ground sensor 19 are connected via a push-pull wire 37, an intermediate link 39 pivotally supported by a rotary case 38, and a telescopic rod 40, and are used to raise and lower the tiller 4 from the ground. Due to the accompanying vertical movement of the ground sensor 19,
The tilling device 4 is lowered by operating the valve 11 by swinging the valve operating arm 26 due to the biasing force of the tension spring 25, and on the other hand, the valve operating arm 26 is moved against the biasing force of the tension spring 25. The lifting control mechanism is configured to raise the tilling device 4 by operating the valve 11 by the swinging of the tiller, and automatically maintain the tilling depth at the ground contact level set by the tilling depth setting lever 18.

Mounting arm 17a of the position lever 17
, the contact rod 4 is inserted in a direction parallel to the protruding operating shaft 15.
1 is provided in a protruding manner, and by bringing its contact rod 41 into contact with the valve operating arm 26, the maximum lowering position of the tilling device 4 with respect to the traveling machine body is set.

A metal fitting 42 is connected to the end of the inner wire 37a of the push-pull wire 37.
A pin 44 protruding from the link 36 is fitted into and connected to the elongated hole 43 formed in the elongated hole 43, and the wire in the longitudinal direction of the elongated hole 43 is connected to the elongated hole 43, using the pin 44 as an abutting portion and serving as a wire end. The side end is brought into contact with the pin 44, and as the tilling device 4 descends relative to the ground, the ground sensor 19 swings upward, and this is used as an operating force to forcibly operate the valve operating arm 26 via the link 36. The tiller device 4 is configured to be raised to a set ground level by a pressing operation.

The tilling depth setting lever 18 is provided so that even if the tilling device 4 is levitated above the ground and the ground sensor 19 detects the highest ground level with the position lever 17 set at a predetermined height at which tilling is normally performed. In this state, as shown in A and B of FIG. 5, by swinging the plowing depth setting lever 18 to the shallowest setting side, the pin 44 becomes fixed, and the link 36 is rotated around the pin 44. It is configured to forcibly swing and operate the valve operating arm 26 to a position close to the maximum position operable by the position lever 17 (indicated by the two-dot chain line _L1 in B of FIG. 5). ing. Therefore, for example, in puddling work, the tilling device 4 for puddling
When suspending the tiller from the traveling machine so that it is located close to the mud surface, set the position lever 17 to the intermediate plowing depth position to prevent the tiller 4 from lowering beyond the setting for the machine. When carrying out plowing work, the ground levitation operation of the tillage device 4 for turning on the headland is maintained at the set position without operating the position lever 17, and the tiller is plowed to an unnecessarily high position. This can be done by swinging the plowing depth setting lever 18 without raising the device 4 above the ground. It goes without saying that at this time, by operating the position lever 17, the tilling device 4 can be levitated above the ground.

In addition, for example, when performing so-called floating work in which the ground level of the tiller 4 is maintained constant by attaching a ground-contact tail wheel, the position lever 17 and the tiller are adjusted as shown in Fig. 6A. All the depth setting levers 18 may be set to the deepest position, and if the sensor 19 is to perform automatic tilling depth control while preventing the tilling device 4 from lowering further than the setting for the traveling machine body, as shown in FIG. As shown in (b), the plowing depth setting lever 18 may be set to a shallower side than the position set by the position lever 17.

In the support member 31, a holder 4 holds an end of the outer wire 37b at a predetermined location thereof.
5 is attached to be rotatable around an axis parallel to the operating shaft 15, and a stopper 45 is provided for abutting and preventing rotation of the holder 45 at a predetermined position.
When the tilling device 4 rises and the outer wire 37b hangs down due to its own weight, due to the hanging down,
It is configured to prevent the inner wire 37a on the link 36 side from buckling upward.

Further, in order to determine the position of the holder 45 in the support member 31, the holder 45 is
Ribs 47, 47 are provided to increase the strength of the mounting portion.

The case side shaft portion 15a is connected to the cover case 1.
0 through an O-ring 48 in a sealed state, and the cylindrical boss 32
is configured to have a relatively small length in the axial direction of the cylinder, and a recess 49 is formed near the location where the cylindrical boss 32 of the support member 31 is connected, and the boss 32
The continuous portion of the O-ring 48 is configured to have a lower rigidity than the mounting portion of the holder 45 so as to allow bending deformation in three-dimensional directions, and allow macroscopic sliding movement of the protruding operating shaft 15. It is configured to locally concentrate the load on a part of the circumferential direction to suppress early wear and tear.

7 and 8 show a modification when applied to a center drive type rotary tilling device 4, in which a center stay 51 is attached to the side surface of a rotary case 50 in which a drive unit is installed, and the center stay 51 There is a mounting hole 5 for mounting a mounting bracket 52 used in the side drive type rotary tiller 4 in the above embodiment.
3, 53 is installed, and its mounting bracket 52
The holding portion 54 at the end of the outer wire 37a
In addition, a pivot pin 55 of the intermediate link 39 is attached, and the same configuration as in the side drive type tilling device 4 can be adopted by simply using the center stay 51.

The present invention only requires that the plowing depth setting lever 18 be attached.

The present invention is a lifting control mechanism for various ground work vehicles equipped with various work devices 4 such as a cutting height control mechanism of a combine harvester, a planting depth constant mechanism of a riding rice transplanter, etc., such as a reaping section and a seedling planting device. Applicable to

[Brief explanation of the drawing]

The drawings show an embodiment of the elevation control mechanism for a ground work vehicle according to the present invention, in which Fig. 1 is a side view of the main parts of a riding-type cultivator, Fig. 2 is an exploded perspective view of the valve operating section, and Fig. 3 is an exploded perspective view of the valve operating section. Fig. 4 is a perspective view showing the control mechanism, Fig. 4 is a sectional view of the main part, Fig. 5 is an explanatory diagram of the operation, A is a side view showing the state in which the ground sensor has detected the highest ground level, and B is the plowing depth. A side view showing a state in which the setting lever is forcibly raised is also shown in FIG.
A is a side view showing the floating state, B is a side view showing the automatic plowing depth control state, FIG. 7 is a perspective view of the main part of a modification, and FIG. 8 is a side view of the main part of FIG. 7. . 4...Ground work device, 5...Hydraulic actuator, 10...Case, 11...Control valve, 15...Protruding operation shaft, 18...Ground level setting lever, 19...Ground sensor, 25...Munition machine ,
26... Valve operation arm, 27a, 27b...
Fixed plate, 29a, 29b...friction plate, 31...support member, 34...rotation member, 36...link, 48...O-ring.

Claims (1)

[Scope of utility model registration request] A ground work device 4 is connected to the traveling aircraft via a hydraulic actuator 5 so as to be able to be driven up and down, and the operating shaft 15 of the hydraulic actuator 5 for the control valve 11 is sealed outward from the case 10 via an O-ring 48. A valve operating arm 26 which is rotatably protruded in the state and is integrally rotatably attached to the protruding operating shaft 15 and a link 36 which is pivotally connected to the ground level setting lever 18 which can be swung and fixed are linked. , the swinging ground sensor 19 for detecting the ground level of the working device 4 is linked with the link 36, and the control valve 11 is switched by the swinging of the sensor 19 to adjust the ground level of the working device 4. The elevation control mechanism for a ground work vehicle is configured to maintain the level within a set range, and the setting lever 18 is loosely fitted to the protruding operating shaft 15, and the setting lever 18 is fixed to the protruding operating shaft 15 by friction. Fixing plate 27 for
a, 27b and the friction plates 29a, 29b, and a support member 31 is provided with a bullet 30 that applies a frictional force, and rotatably supports the proximal end side of the protruding operation shaft 15. A detent member 34 is attached to the case 10 and protrudes from the support member 31 in parallel with the operating shaft 15 to penetrate through the fixed plates 27a and 27b and prevent their rotation. Control mechanism.