JP2542874B2 - Pre-operation part operation lever lock method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention mainly relates to a method of locking a pretreatment unit operating lever in a combine.

<Prior Art> Conventionally, regarding the raising and lowering of the pretreatment unit by the single-acting cylinder, the raising of the pretreatment unit is performed by the hydraulic pressure applied to the raising and lowering cylinder, and the lowering is performed by opening the valve of the raising and lowering cylinder. It was done by its own weight.
The operation of hydraulic pressure for these lifting cylinders is performed by an operating lever pivotally supported near the driver's seat, and the operating lever is swung back and forth, left and right, etc. to electrically or mechanically operate hydraulic pressure. The valve of the circuit was opened and closed to operate the raising and lowering of the pretreatment section.

Further, the operating lever is always biased to a position for closing and operating the valve, that is, a neutral position, and is configured not to swing easily except when operated by an operator.

On the other hand, in the pretreatment section lifting mechanism, there is one in which the pretreatment section is detachably attached to the lifting cylinder, and further the pretreatment section and the main body can be attached and detached. When installing the pretreatment section, the lifting cylinder must be set to the lowest position. In the lifting mechanism using the single-acting cylinder described above, the pretreatment section is removed and the lifting device does not descend due to its own weight. Had to push down.

<Problems to be solved by the invention> However, since the conventional operation lever device is always biased to the neutral position (valve closing operation position), the operator fixes the operation lever in the lowered position to release the hydraulic valve. There was a problem that another worker had to push down the single-acting cylinder in order to maintain the state, and that two workers were required to attach the pretreatment section.

<Means for Solving Problems> According to the present invention for solving the above problems, the pretreatment unit is detachably attached to a single-acting cylinder that raises and lowers the pretreatment unit, and the operation lever of In a mechanism that controls the hydraulic pressure of the single-acting cylinder to raise and lower the pretreatment section by operation, the operating lever is locked in a lowered position by utilizing a mechanism that locks the operating lever in a neutral position.

<Operation> The pretreatment section is raised by applying hydraulic pressure to the single-acting cylinder, and is lowered by the weight of the pretreatment section.

The operating lever 7 controls the hydraulic pressure sent to the single-acting cylinder to stop the oil flow at the neutral position and maintain the ascending / descending position of the pretreatment section.

When the operating lever 7 is locked in the lowering operation position by using the mechanism for locking the operating lever 7 in the neutral position, it is not necessary for the operator to continue to urge the operating lever 7 to the lowering operation position.

<Embodiment> FIG. 8 is a side view of the whole pretreatment section of the combine using the method of the present invention, and the combine is composed of the machine body 1 and the pretreatment section 4.

A lift arm 8 provided in front of the machine body 1 is swingably attached to a front end of the machine body frame 2 of the machine body 1, and a pretreatment unit 4 is provided between the lift arm 8 and the machine body frame 2 front end.
A hydraulic single-acting cylinder for moving up and down is interposed. At the tip of the lift arm 8, a lower support rod (lower support point) provided in the left and right direction at the rear end of a pretreatment frame 4a described later.
A lower support portion 8a for rotatably accommodating 4b is provided. As shown in FIG. 8, the lower support portion 8a has a lower support rod 4b.
Has a U-shaped cross-section that supports from above, and the pretreatment unit 4 can be attached and detached in the upward direction.

FIG. 5 shows a side surface of the combine near the driver's seat. A driver's seat 3 is provided on the right side of the machine body 1, and an operation panel 5 is provided on the front and left sides of the driver's seat 3. .

On the operation panel 5, an operation lever 7 for an operator to move the pretreatment section 4 up and down is attached to the machine body so as to be swingable back and forth.

As shown in FIGS. 1 and 2, the operating lever 7 is swingably supported by a support shaft 11 which is inserted through a boss 9 provided at the lower end and is fixed to the machine body side. A spring 13 is wound around the peripheral surface of the boss 9, and both ends of the spiral are bent at both opposite positions of the operating lever 7 so as to hold the operating lever 7 and always maintain a neutral position (vertical posture). The operation lever 7 is biased by an appropriate force.

The operation lever 7 extends upward through the guide hole 15a of the guide plate 15 attached to the operation panel 5 and has a grip 7 at the upper end.
have a. The operating lever 7 swings while being guided by the slit-shaped guide hole 15a which is long in the front-rear direction.

As shown in FIG. 3, the operating lever 7 is provided with a lock device 17 on the side of the guide hole 15a. Locking device 17
The guide plate 15 includes a support plate 19 having both ends fastened to the guide plate 15 by bolts 18, and a fixture 21. The rectangular plate-shaped fixture 2 has a U-shaped cutout 21a.
And a pin insertion portion 21b curved in a ring shape is provided at a position facing the accommodation portion 21a. The insertion portion 21b is housed between the pair of support portions 19a formed in the same manner as the insertion portion 21b on the guide hole 15a side of the support plate 19, and is rotatably supported by the pin 23.

The accommodating portion 21a of the fixing device 17 configured as described above accommodates and locks the operation lever 7 in the neutral position. Further, as shown by the imaginary line in FIG. 1, if the fixing tool 21 is rotated upward and the lock is released, the operation lever 7 can be freely rocked.

Here, after moving the operating lever 7 to the lowering operation position, and covering the guide hole 15a with the fixing tool 21, the front end side of the fixing tool 21 becomes the restriction portion 21c, and the operating lever 7 is locked in the lowering operation position. You can

An operating arm 25 interlocking with the rotary switch 27 is engaged with the base end portion of the operating lever 7 and the rotary switch 27 is switched by swinging the operating lever 7.
By switching the rotary switch 27, the hydraulic valve of the single-acting cylinder 6 is controlled to open and close, and the pretreatment unit 4 is moved up and down.

A case where the operation lever 7 needs to be locked at the lowering operation position will be described. As shown in FIG. 8, when the pretreatment unit 4 is attached to the combine main body 1 from which the pretreatment unit 4 is removed. , The operating lever 7 is locked in the descending operation position using the method of the present embodiment, and the operator who has performed the ascending / descending operation turns to the front of the machine body and pushes down the single-acting cylinder 6 downward. In this state, lower support 8a is connected to lower support 4b.
And the lift arm 8 is raised by the single-acting cylinder 6 to complete the attachment of the pretreatment unit 4 to the machine body 1.

Furthermore, the method of the present invention may use other fixation devices. For example, as shown in FIG. 4, it is also possible to use a fixture 21 that is provided with two housing portions 21a and can be locked at the neutral position and at the lowering operation position.

Further, as shown in FIG. 6 and FIG. 7, as for the monolever 33 which also serves as the steering lever in the combine or the like and the lift lever of the pretreatment section, one end of the fixing member 36 is attached to the handle 35 attached in front of the monolever 33. Alternatively, the fixing device 36 can be rotatably mounted and can be locked by a fixing device in which the housing 36a for housing the protrusion 33a of the monolever 33 is formed in the fixing tool 36.

In this case, there is an advantage that the lock can be easily confirmed from the outside and the mechanism is simple and the cost is lower than that in which the fixing device is internally provided in the operation panel 31.

FIG. 9 is a partial sectional view of the transmission case 51 of the continuously variable pulley 52. A pulley 52 is attached to one end of a rotating shaft 53 that is rotatably supported in the transmission case 51 so as to be integrally rotatable, and is attached to the rotating shaft 53 in the transmission case 51. The gear meshes with the gear on the other rotating shaft.
An oil passage 55 for supplying lubricating oil to the sliding pulley 65 is provided at the center of the rotating shaft 53, and one end of the oil passage 55 has an oil hole 57 at a position facing the lower gear 59. Is equipped with a sliding pulley
A fuel filler 61 is provided near the mounting portion of 65.

With this structure, when each gear rotates due to power transmission, the lubricating oil in the transmission case 51 that the gear 59 splashes is sucked through the oil hole 57 by the sliding of the sliding pulley 65, and the oil passage 55 and the oil supply Through the opening 61, the sliding surface 63 of the sliding pulley 65 is filled.

<Effects of the Invention> According to the method of the present invention configured as described above, when the pretreatment section is mounted, the operator fixes the operation lever at the pretreatment section lowering operation position and then pushes down the single-acting cylinder. As a result, the work of mounting the pretreatment unit can be completed independently, and the number of workers can be reduced as compared with the conventional combine harvester.

Further, there is an advantage that the device for fixing the operation lever in the neutral position can be used as it is, and a complicated mechanism for positioning the operation lever is not required.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. A rear view and a side view of an operating lever showing a mounting structure of the operating lever, FIG. 3 is a plan view of a fixing device, and FIG. FIG. 5 is a plan view showing an example of the fixing device of FIG. 5, FIG. 5 is a partial side view of the combine showing the mounting state of the fixing device, and FIGS. 6 and 7 show the fixing device for the monolever. Drawing and a rear view, Drawing 8 is a partial side view showing a pretreatment part attachment part of a combine, and Drawing 9 is a partial sectional view of a transmission case. 4: Pretreatment part, 6: Single acting cylinder 7: Operating lever, 17: Fixing device 21: Fixing device

Claims (1)

(57) [Claims] 1. A mechanism for lifting and lowering a pretreatment unit by detachably attaching the pretreatment unit to a single-acting cylinder for raising and lowering the pretreatment unit, and controlling hydraulic pressure of the single-acting cylinder by operating an operating lever. In the above, in the pretreatment section operation lever locking method, the operation lever is locked at the neutral position, and the operation lever is locked at the lowered position.