JPH0132496Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention connects a ground work device to a traveling aircraft through 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 work equipment is connected to the link via a pushable wire, and the rocking of the sensor switches the control valve to adjust the ground level of the work equipment. The present invention relates to a lift control mechanism for a ground work vehicle configured to maintain the temperature within a set range.

In the above-mentioned conventional device, as pressing force is applied to the valve operating arm during rotation of the protruding operating shaft, the entire operating shaft is rotated while being pressed in one direction, and a load is applied to a part of the circumferential direction of the O-ring. There was a drawback that the O-rings were worn out early due to concentration of water.

In view of the above points, the present invention prevents an uneven load from being applied to the O-ring due to the rotation of the operating shaft, and also simplifies the mounting structure of the plowing depth setting lever and the outer wire holder. The purpose is to

In order to achieve the above object, the present invention provides the above-mentioned elevation control mechanism for a ground work vehicle, in which the setting lever is loosely fitted to the protruding operating shaft, and the proximal end side of the protruding operating shaft is rotatably supported. attaching a support member having continuous cylindrical bosses to the fixed member, and rotatably attaching a holder for the link side end of the outer wire of the pushable wire to the support member;
Further, a portion of the support member where the bosses are connected is configured to have a lower rigidity than a mounting portion of the holder so as to allow bending deformation in three-dimensional directions.

In other words, by supporting the proximal end of the protruding operating shaft with the cylindrical boss, part of the load accompanying the rotation of the operating shaft is borne by the supporting member, reducing the unbalanced load applied to the O-ring, and It is now possible to prevent premature wear and tear.

Furthermore, the setting lever is loosely fitted onto the protruding operating shaft, and the outer wire holder is attached to the support member, thereby simplifying the mounting structure of both the setting lever and the outer wire holder. Moreover, if the support member is simply provided with the cylindrical boss,
If there is an error in assembling the support member to the case, the operation shaft may be pushed toward a part of the circumferential direction of the O-ring from the initial stage of assembly due to the assembling, resulting in the O-ring being damaged. However, according to the present proposal, the mounting part of the holder has high rigidity to fix its position, while the cylindrical boss is bent and deformed in three dimensions by the rotational force of the operating shaft.
Allows for macroscopic grinding motion, applies pressure distributed to the O-ring in the circumferential direction, prevents O-ring wear and tear caused by errors in assembly of supporting members, and extends the life of the O-ring. I am now able to successfully increase the amount.

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 are provided on the other side in a state that they are rotatable and protrude outward from the case 10, and 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 rotatable integrally with the extended operating shaft 15b.
A cylindrical support member 28 having a fixed plate 27a connected thereto 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 as a fixed member. A protruding operating shaft 15 is attached to the support member thereof.
A detent member 34 is provided in a protruding manner parallel to the detent member 34, and the detent member 34 penetrates through all of the first to fourth fixing plates 27a, 27b, 27c, and 27d, and 4 fixing plates 27a, 27b, 27c, and 27d, the rotation preventing member 34 is used to cooperate with the cylindrical boss 32 to prevent the operation shaft 15 from rotating.
It is constructed to reinforce and support.

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 pushable 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 tillage device 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 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 pushable wire 37.
A pin 44 protruding from the link 36 is fitted into and connected to the elongated hole 43 formed in the link 2, and the pin 44 is used as a contact portion to form a wire end portion.
The end of the elongated hole 43 on the wire side in the longitudinal direction 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 operate the valve via the link 36. Operation arm 26
The tiller 4 is forcibly pressed to raise the tillage device 4 to a set ground level.

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 when the position lever 17 is set at a predetermined height at which tilling is normally performed. In this state, by swinging the plowing depth setting lever 18 to the shallowest setting side, as shown in FIG. It is configured to forcibly swing and operate the valve operating arm 26 to a position close to the maximum operable position (indicated by the two-dot chain line _L1 in B in FIG. 5) by the position lever 17. 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 tillage work, the tiller 4 is kept at the set position without operating the position lever 17, and the tiller 4 is raised to an unnecessarily high position for tilling on the headland. This can be done by swinging the plowing depth setting lever 18 without raising the plowing depth setting lever 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 automatic tilling control by the sensor 19 is to be performed while preventing the tilling device 4 from lowering the traveling machine body by more than the set value, the steps shown in FIG. As shown in FIG. 2, 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, at a predetermined location,
A holder 45 that holds the end of the outer wire 37b is attached to be rotatable around an axis parallel to the operating shaft 15, and a stopper 46 is provided that abuts and prevents rotation of the holder 45 at a predetermined position. , the tilling device 4 rises and the outer wire 37b
When the inner wire 37a on the link 36 side sags due to its own weight, this sagging prevents 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.

In order to reduce the rigidity of the part where the bosses 32 are connected, the method is not limited to providing the recess 49 as described above, for example, reducing the thickness of the support member 31, etc.
Various structural modifications are possible.

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

[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 the riding 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, and FIG. 6 is also an explanatory diagram of the operation.
A is a side view showing the floating state, and B is a side view showing the automatic plowing depth control state. 4... Working device, 5... Hydraulic actuator,
10...Case, 11...Control valve,
15... Protruding operation shaft, 18... Ground level setting lever, 19... Ground sensor, 26... Valve operating arm, 31... Support member, 32... Cylindrical boss,
33...Fixing member, 36...Link, 37...Pushable wire, 37b...Outer wire,
45...Holder, 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. , a swinging ground sensor 19 for detecting the ground level of the working device 4 is linked to the link 36 via a pushable wire 37, and the control valve 11 is switched by the swinging of the sensor 19; An elevation control mechanism for a ground work vehicle configured to maintain the ground level of the work device 4 within a set range,
The setting lever 18 is loosely fitted onto the protruding operating shaft 15, and a supporting member 31 having a cylindrical boss 32 that rotatably supports the proximal end of the protruding operating shaft 15 is attached to the fixed member 33 and supported. The outer wire 3 of the pushable wire 37 is attached to the member 31.
The holder 45 at the link side end of 7b is rotatably attached, and the boss 32 of the support member 31
An elevation control mechanism for a ground work vehicle in which the rigidity of the connecting portion of the holder 45 is made smaller than that of the mounting portion of the holder 45 so as to allow bending deformation in three-dimensional directions.