JPH064669Y2 - Work machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is represented by an agricultural machine such as a combine and a construction machine such as a backfor, in which a working device is attached to a machine body having left and right traveling devices so as to be able to move up and down. Regarding work machines.

[Prior Art] In a work machine of this type, a single structure is conventionally used to configure an operating structure for side clutches and brakes provided for the left and right traveling devices and an operating mechanism for raising and lowering the work device. The operating lever is provided, and the side clutch / brake is operated by swinging the operating lever to the left and right, and the lifting operation is possible by swinging the operating lever back and forth.

[Problems to be solved by the invention]

In this case, while operating the side clutch / brake to the left or right, operate the operating lever back and forth unintentionally or with a momentum to raise or lower the work device when not necessary, or vice versa. However, the problem of erroneous operation such as operating the side clutch / brake during the lifting operation of the work equipment was unavoidable.

An object of the present invention is to provide a simple operation mechanism for an operating lever, which avoids the problem of erroneous operation and further improves operability.

[Means for solving problems]

The present invention is provided with an operating lever that can be selectively operated to raise or lower the working device by swinging the working device in the forward and reverse directions, and the grip portion of the operating lever is provided with a side provided on each of the traveling devices. A switch that can selectively operate the clutch / brake is provided so that it can be operated in the forward and reverse directions, and one side clutch is disengaged by operating the first stage of one of the switches, and the second stage that follows. Operation, switch the side brake on the side where the side clutch is disengaged to the engaged state while maintaining the disengaged state of one side clutch, and disengage the other side clutch by operating the first step to the other side of the switch, In addition, the second brake operation is continued to maintain the disengaged state of the other side clutch while disengaging the side brake on the side where the side clutch is disengaged. To obtain state, switch and side clutch
It is linked to the brake, and its effects are as follows.

[Action]

In other words, the swinging operation of the operation lever itself can raise and lower the work device, and the side clutch / brake operation, that is, the turning operation, can be performed by the switch operation with fingers while holding the operation lever. Become.

Generally, when turning, a wide variety of operations such as a selection operation of driving the left or right traveling device, a selection operation of the left or right side clutch / brake, a lifting operation of a working device, or a traveling speed control operation. Is often done. Therefore, as in the present application, the switches are collectively arranged on a single operation lever, and a structure capable of performing different kinds of operations without changing the holding of the operation tool can contribute to simplifying and facilitating the operation at the time of turning. .

In addition, the operation lever and the switch are assigned the functions so as to be clearly distinguished from each other, which is also useful for reducing erroneous operations.
In addition, by adopting a switch operation mechanism, in the case of side clutch / brake operation, finger operation is much easier than in the conventional type in which the operation lever is swung to the left or right or back and forth to increase the operation stroke. It is easy to operate because it is enough.

[Effect of device]

As a result, it is possible to obtain a preferable structure in which the operation load at the time of turning, which tends to be busy in which a large number of operations are performed in a short time, is lightened and facilitated, and the number of erroneous operations is reduced. However, as disclosed in Japanese Utility Model Laid-Open No. 59-66832, the work device is moved up and down by such swinging of the operation lever, and a side clutch changeover switch is provided at the grip portion of the operation lever. However, in this case, when operating the side clutch / brake, it is possible to add another operation tool, but in the case of the present invention, the switch is operated in two steps to the left and right. It only needs to be modified to make changes, and with the simplification of the structure,
Operability can be improved.

Therefore, in the case of an agricultural machine, when making a sharp turn at the edge of a ridge, etc., the work device is turned by swinging the operation lever, and at the same time, the side clutch / brake is activated by finger operation, thereby making a small turn. It became possible to turn, and the operation for that was made easier by using a switch.

〔Example〕

As shown in FIG. 5, the combine is a weeding tool supporting rod.
(1), raising device (2), (2) provided in a grain culm introduction path formed by this weeding tool supporting rod (1), mowing device (3) for mowing grain culms after raising The pre-cutting treatment device, which is one of the working devices (27) equipped with the vertical transport device (5) for transporting the harvested grain culms toward the threshing device (4), is hydraulically attached to the machine body (28). It is configured so that it can be driven up and down freely by (29), and this machine body (28) is supported by a pair of left and right crawler traveling devices (9A), (9B) so as to be able to cut and travel.

Next, the left and right side clutch / brake (6A) and (6B) structures will be described. As shown in Fig. 4, the traveling shafts (8A) and (8B) are extended laterally from the mission case (7) to the left and right, and the extended ends of the traveling shafts (8A) and (8B) are extended to the left and right. The crawler traveling devices (9A) and (9B) are connected. Inside the mission case (7), the left and right side clutches and brakes (6
A) and (6B) are installed, and this side clutch / brake (6
Operation arms (10A) and (10B) for A) and (6B) are linked to operation cylinders (11A) and (11B). As shown in FIG. 1, the left and right traveling shafts (8A) and (8B) are arranged so as to be rotatable relative to each other at the butting facing surfaces, and the input gear ((A) straddling both traveling shafts (8A) and (8B) is disposed. 12) is loosely fitted. On both sides of this input gear (12), left and right operation sleeves (13A), (13B) which can be engaged and disengaged with this input gear (12) slide on the left and right running shafts (8A), (8B). The spline is fitted so as to be possible. The left and right operation sleeves (13A) and (13B) are urged by the springs (14A) and (14B) in the direction of engagement with the input gear (12), and between the brake cases (15A) and (15B). Friction plates (16A) and (16B) that are installed in the
A) and (16b) are attached. Also, the left and right operation sleeves
(13A) and (13B) engage the left and right shift forks (17A) and (17B) that are interlocked with the operation arms (10A) and (10B), and engage with the input gear (12). Left and right side clutches (6
It forms a) and (6b).

The hydraulic circuit structure for the side clutch / brake (6A), (6B) will be described. Pressure oil from the hydraulic pump (18) is passed through the three-position switching solenoid valve (19) to the left and right operation cylinders (11
A), (11B) and the operating cylinder (11A),
Oil is drained through the relief electromagnetic valve (20) and the variable relief valve (30) connected in the middle of the stroke of (11B). The connection point of the relief solenoid valve (20) with the left and right operating cylinders (11A), (11B) is the operating sleeve (13A).
Positions A) and (13B) are such that only the stroke from the clutch engaged state to the clutch disengaged state operates.

Therefore, when the solenoid valve (19) is set to be switched, only one of the side clutches (6a) is maintained in the disengaged state, and further sliding of the corresponding operation sleeve (13A) causes the relief solenoid valve (6A) to slide. It is prevented by the oil draining action of 20). From this state, when the relief solenoid valve (20) is switched to the closed state, the operating cylinder (11A) further operates and the shift fork is moved.
Drive (17A) and activate the brake (16A). Also, when the solenoid valve (19) is set to be switched to supply pressure oil and the variable relief valve (30) is artificially adjusted, the oil supply pressure to the operating cylinder (11A or 11B) can be changed to reduce friction. The braking force of the multi-plate brake (16A or 16B) can be changed.

The circuit is branched from the hydraulic pump (18) to supply pressure oil to the lifting hydraulic cylinder (29) for the pre-harvest treatment device (27) to the electromagnetic valve (2
It is designed to be supplied via 1).

Next, the operation structure of the side clutches / brakes (6A) and (6B) and the raising / lowering mechanism of the pre-mowing treatment device (17) will be described. A single operating lever (22) that can be swung back and forth is provided.
At the top of the grip (22A) of (22), a switch (2
3) is installed. A slip ring type contact electrode portion (24) is provided in the swinging space of the operation lever (22), and the contact electrode portions (24) are arranged so as to be positioned in a pair in front and rear and concentrically, It is electrically connected to the solenoid valve (21). Therefore, if the operating lever (22) is operated forward, the pre-mowing treatment device (27) can be lowered, and if it is operated backward, it can be raised.

As shown in FIG. 2, the changeover switch (23) includes an operation section (23A) which is operated by fingers and a changeover switch (23).
Pair of left and right sliding contact type electrode pieces (25A), (25B) and a pair of left and right contact type electrode pieces (26A), (26B) arranged side by side along the rocking space of
And the operating part (23B) which is connected to each of the sliding contact type electrode piece (25B) by swinging the first stage to the left or right.
A) and (25B) are electrically connected, and the switching solenoid valve (19) is operated to switch the side clutch (6a or 6b) to the disengaged state. While maintaining contact with the electrode piece (25A or 25B), contact with the contact type electrode piece (26A or 25B) and close the relief solenoid valve (20) to operate the side brake (16A or 16B). It is configured to operate. Therefore, if the switch (23) is operated to the left by one step, it can be swung to the left slowly, and if it is operated at two steps, it can be swung to the left rapidly, and if steered to the right, it can be swung to the right.

Further, a configuration in which the brake operating force of the friction multi-plate brake (16A or 16B) can be varied will be described. As shown in FIGS. 1 and 3, a pair of left and right side clutch / brake pedals.
(27A), (27B) are provided, and the switching solenoid valve is detected by detecting the stepping operation of the side clutch / brake pedals (27A), (27B).
Limit switches (28A) and (28B) for energizing (19) are provided and the side clutch / brake pedal (27
The variable relief valve (30) is arranged below A) and (27B). A leaf spring (31) capable of swinging up and down is provided above the relief valve (30), and actuating rods (32) protruding from the side clutch / brake pedals (27A) and (27B) are provided.
The leaf spring (31) is pressed by A) and (32B), and the pressed leaf spring (31) acts on the spool of the variable relief valve (30) to change the set pressure. Therefore, the side clutch (6a or 6b) is disengaged to change the operating force of the side brake (16A or 16B), and an arbitrary gentle turning is possible.

[Another embodiment]

The changeover switch (23) provided on the grip portion (22A) of the operation lever (22) may be of a slide type instead of a swing type.

(B) The above embodiment may be applied to other agricultural machines and construction machines.

C. The swinging of the operating lever (22) in the vertical direction of the working device (4) may be vertical, and its directionality is not specified.

[Brief description of drawings]

FIG. 1 shows an embodiment of a working machine according to the present invention. FIG. 1 is a configuration diagram showing the linkage between a side clutch / brake, an operating system and a hydraulic circuit, and FIG. 2 is a vertical sectional view of a side clutch / brake switch. FIG. 3 is a side view showing a switch structure by a side clutch / brake pedal, FIG. 4 is a plan view showing an arrangement of a mission case and a crawler traveling device, and FIG. 5 is a side view showing a combine pre-mowing processing section. Is. (6A), (6B) …… Side clutch / brake, (9A), (9B)
...... Traveling device, (16A), (16B) …… Side brake, (22)
...... Operating lever, (22A) ...... Grip, (23) ...... Switch, (27) ...... Working device.

Claims (1)

[Scope of utility model registration request] 1. A working machine in which a working device (27) is attached to a machine body having left and right traveling devices (9A) and (9B) so as to be able to move up and down, and the working device is swingable in forward and reverse directions. The operating lever (22) capable of selectively operating the ascending or descending operation of the (27) is provided, and both the traveling devices (9A) and (9B) are provided at the grip portion (22A) of the operating lever (22). Side clutches provided for each
Switch (23) that can selectively operate the brakes (6A) and (6B)
Is provided so as to be operable in the forward and reverse directions, and one side clutch (6a or 6b) is disengaged by the operation of the first stage to one side of the switch (23), and
The side brake (16A or 1A) on the side where the side clutch (6a or 6b) is disengaged while maintaining the disengaged state of the one side clutch (6a or 6b) by the subsequent second step operation.
6B) is switched to the ON state, and the other side clutch (6b or 6a) is disengaged by the first operation of the other side of the switch (23), and
The side brake (16B or 1B) on the side where the side clutch (6a or 6b) is disengaged while maintaining the disengaged state of the other side clutch (6b or 6a) by the subsequent second-stage operation.
6A) to the ON state, the switch (23) and the side clutch / brake (6
A work machine that links A) and (6B).