JPH0692227B2 - Work vehicle steering structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a forward drive transmission clutch and a reverse drive transmission clutch in the transmission mechanism of each of the left and right traveling devices. Each of these transmission clutches is provided. Forward and reverse clutch cylinders that enter and operate separately as the extension operation is performed, and forward and reverse master cylinders that are individually connected to the clutch cylinders are provided. The operation lever that can be rocked is provided, and
Of the two master cylinders, the forward master cylinder is
Juxtaposed along the left-right direction on the front side of the operation lever,
In addition, the reverse master cylinder is juxtaposed along the left-right direction on the rear side of the operation lever, and the cylinder operation member that selectively presses each of the master cylinders as the operation lever swings, The present invention relates to a steering structure for a work vehicle provided on an operation lever.

[Conventional technology]

The steering structure of such a work vehicle is configured such that one operating lever can switch between a forward drive state and a reverse drive state and a left turn state and a right turn state.

By the way, conventionally, the four master cylinders have been arranged so that the ones aligned in the front and rear on the lateral one side or the lateral other side of the operation lever correspond to the same traveling device.

Therefore, by swinging the operation lever forward or backward and pressing the two forward movement master cylinders or the two backward movement master cylinders, the operation lever is switched to the forward movement state or the reverse movement state, and the operation lever is moved diagonally forward or backward. By swinging diagonally backward and pressing one side of the two forward master cylinders or one side of the two reverse master cylinders,
It is possible to turn while driving only one side of the left and right traveling device in a forward or reverse drive state. (See, for example, Japanese Patent Application No. 62-12879 previously proposed by the present applicant.) [Problems to be Solved by the Invention] To turn the vehicle body, one of the left and right traveling devices is in a forward state and the other is in a reverse state. If the vehicle is driven by, it is possible to rapidly and accurately turn by the propulsive force of each of the left and right traveling devices, and it is desirable to be able to turn in such a turning manner.

However, with the conventional configuration, the left and right traveling devices cannot be operated in a state of being driven in the opposite direction, and there is room for improvement.

The present invention has been made in view of the above circumstances, and an object thereof is a state in which one side of a left / right traveling device is driven to make a turn and a left / right traveling device while utilizing the advantage of steering with one operating lever. It is possible to select either of the states in which the vehicle is driven in the opposite direction to turn.

[Means for Solving the Problems]

The characteristic structure of the steering structure of the work vehicle according to the present invention is such that the four master cylinders correspond to a traveling device in which the relationship between the four master cylinders arranged side by side on one side or the other side of the operation lever is different. It is located at the point where it is located in the area, and its action and effect are as follows.

[Work]

That is, the operating lever is swung forward or backward to switch between the forward and backward states, and the operating lever is swung diagonally forward or backward to turn while driving only one side of the left and right traveling device. It is possible to switch to the state, and in addition, by swinging the operating lever to the left or right, the forward master cylinder and the reverse master cylinder for different traveling devices are pressed and operated, and It is possible to turn while driving one in a forward drive state and the other in a reverse drive state.

〔The invention's effect〕

Therefore, with one operating lever, not only switching between forward and backward, but also a turning state while driving one side of the left and right traveling device, and one of the left and right traveling devices in a forward traveling state and the other in a reverse traveling state are driven. While it is possible to make a turning suitable for various situations while selecting the turning state, it is possible to obtain an extremely convenient steering structure for the work vehicle as a whole.

〔Example〕

Hereinafter, a case where the steering structure of the present invention is applied to an aerial work vehicle mainly used in orchards and the like and for growing and managing works such as harvesting work, chemical application, pruning, and flower cutting will be described with reference to the drawings.

As shown in FIG. 7, an aerial work vehicle is a traveling vehicle (V).
And a parallel four-link type boom (2) which is operated to move up and down by a hydraulic cylinder (1), and a riding bucket (3) at the tip of the boom (2). The boarding bucket (3) has a guard pipe (3A). The boom (2) comprises a square pipe-shaped main arm (2A) and a rod-shaped auxiliary arm (2B) inside thereof.

The traveling vehicle body (V) is provided with left and right propulsion wheels (4L) and (4R) as left and right traveling devices, and casters (5), and then, the left and right propulsion wheels (4L). ,(Four
The transmission structure to R) will be described based on FIG.

The engine (B) mounted on the rear end side of the traveling vehicle (V)
And the relay transmission shaft (6) arranged on the front side of the relay transmission shaft (6) are interlockingly connected via a transmission belt (7), and the relay transmission shaft (6)
In the front part of the, the left transmission case (8L) that houses the forward / reverse switching gear transmission for the inner propulsion wheel (4L) and the right side that houses the forward / reverse switching gear transmission for the right propulsion wheel (4R) Each of the transmission cases (8R) is provided, and the transmission cases (8L) and (8R) and the relay transmission shaft (6) are connected via a left transmission clutch (Lc) and a right transmission clutch (Rc). Separately linked, output shafts (13L), (13R) of both transmission cases (8L), (8R) respectively
However, the left and right propulsion wheels (4L) and (4R) are interlockingly connected to each other by transmission chains (14L) and (14R).

Each of the transmission clutches (Lc) and (Rc) has a forward input shaft (9) supported by each of the transmission cases (8L) and (8R).
L), (9R) and a relay transmission shaft (6) interposed between belt tension type forward transmission clutches (11L), (11)
R), and the reverse transmission input shafts (10L) and (10R) supported by the transmission cases (8L) and (8R), respectively, and the relay transmission shaft (6).
It is equipped with a belt tension type reverse transmission clutch (12L), (12R) interposed between and.

The forward / reverse switching gear transmission will be described. still,
The left and right forward-reverse switching gear transmissions have the same structure, and the left-side forward-reverse switching gear transmission will be described below.

That is, the first gear (1
6) and the second gear (17) fixed to the reverse input shaft (10L) are interlocked with each other and fixed to the third gear (18) fixed to the reverse input shaft (10L) and the output shaft (13L) The forward transmission clutch (11
L) When the reverse transmission clutch (12L) is disengaged when engaged, the power of the forward input shaft (9L) is first transmitted to the reverse input shaft (10L) and then the output shaft (13L). )
It is configured to switch between forward and reverse rotation by transmitting to.

However, in the figure (U), the boom lifting cylinder (1)
Is a hydraulic unit, and is linked to the relay transmission shaft (6) using a transmission belt (15).

Further, (20L) and (20R) in the figure are the output shafts (13L) and (1
It is a traveling brake that is urged toward the side of the braking action that acts on (3R).

Next, the operation configuration will be described.

As shown in FIGS. 5 and 6, the four transmission clutches (11L), (11R), (12L) and (12R) have tension arms (21L), (21R), (22L) and (22R) respectively. ) To the clutch cylinder (23L), which is operated with extension operation.
((23R), (24L), (24R) are provided, and the clutch cylinders (25L), (25L) are connected to the clutch cylinders (23L), (23R), (24L), (24R), respectively.
R), (26L), and (26R) are provided.

As shown in FIG. 1 to FIG. 3, the operating lever (28) is attached to the mounting base (27) provided on the inner surface side of the boarding bucket (3) by using the universal joint (29) in the front-rear direction and left-right direction. It is mounted so that it can swing in any direction. And the four master cylinders (25L), (25R),
Of the (26L) and (26R), the forward master cylinder (25
L) and (25R) are juxtaposed along the left-right direction with the one corresponding to the left propelling wheel (4L) (25L) positioned on the right side in front of the operation lever (28), and in reverse. Master cylinders (26L), (26R) are arranged side by side in the left-right direction with the right-hand propulsion wheel (4R) (26R) positioned on the right side. By the way, with such an arrangement, four master cylinders (25L), (2
5R), (26L), and (26R) are arranged so as to correspond to traveling devices having different relations between those arranged in the front and rear on the side of one side or the side of the other side of the operation lever (28). .

A plate-shaped cylinder operating member (30) for selectively pressing the master cylinders (25L), (25R), (26L), (26R) according to the swing of the operating lever (28) is operated. It is attached to the lever (28) by welding.

That is, the piston rod (D) of each master cylinder (25L), (25R), (26L), (26R) is returned by the cylinder operating member (30) along with the swing of the operating lever (28). It is designed to be pushed and moved against.

Each master cylinder (25L), (25R), (26L), (2
6R) is fixed to the boarding bucket side via the support bracket (31) of the mounting base (27). And each piston rod (25L), (25R), (26L), (26R)
It is slidably guided by the cylindrical guide (32) of the mount (27).

Further, in the figure, (33) is a guide plate of the operation lever (28), which is a forward position for operating the two forward master cylinders (25L) and (25R), and two backward master cylinders (26).
L), (26R) operating backward position, two forward master cylinders (25L), operating one side of (25R) forward left turning position and forward right turning position, two reverse master cylinders (26L) , (26R) operating one side of the reverse left turn position and the reverse right turn position, the forward master cylinder (25L) corresponding to the left propulsion wheel (4L) and the rear propulsion rear wheel (4R) corresponding to the right Clockwise rotation position for operating the master cylinder (26L), and the forward master cylinder (26L) corresponding to the left propulsion wheel (4L) and the forward master cylinder (4R) corresponding to the right propulsion wheel (4R). The operating lever (28) is guided to each of the counterclockwise turning positions for operating (25L) and.

Therefore, by swinging one operating lever (28), a forward drive state, a reverse drive state, a state in which one side of the left and right propulsion wheels (4L), (4R) is driven to turn, the left and right propulsion wheels (4L),
(4R) is driven in the opposite direction and can be operated in each turning state.

The traveling brakes (20L) and (20R) can be switched to the brake release state in accordance with the operation of engaging the transmission clutches (Lc) and (Rc).
The explanation will be given with reference to c). That is, as shown in FIG. 6, the linkage arm (34) for releasing the travel brake (20L) is provided with the tension arm (21L),
When any one of (22L) is operated toward the clutch engaged side, it is pivotally supported by the pivot shaft (35) of the tension arms (21L) and (22L) while being pressed and oscillated toward the brake release side.
The brake operating arm (37) urged toward the braking action state by the spring (36) uses the push-pull rod (38), the relay swing arm (39), and the push-pull link (40). It is interlocked with the linkage arm (34).

In FIG. 7, (41) is a boom raising / lowering pedal provided in the boarding bucket (3), (42) is a container loading frame mounted in the boarding bucket (3) in a locked state, (43) Is a container platform provided on the traveling vehicle body (V).

When the container mounting frame (42) is further described, as shown in FIGS. 8 and 9, a pair of left and right L-shaped locking frames (44a) and (44b) having hook portions on the upper end side are provided. , The one on the left side is provided with a shorter vertical length, and a reinforcing frame (45) for connecting the locking frames (44a) and (44b) is provided,
A pair of plate-shaped bosses (47) attached to the bottom portion on the left end side of the mounting plate (46) are rotatably fitted onto the left locking frame (44a), and the right end side of the mounting plate (46). Pin insertion holes (S) are formed at appropriate intervals in the longitudinal direction on a protrusion rod (48) pivotally attached to the bottom of the protrusion, and the protrusion rod (48) and the locking frame on the right end side. A fixing pin (50) is provided so that it can be inserted through the U-shaped bracket (49) attached to the tip of the (44b).

Therefore, the container placing frame (42) is for placing the container (Z) for storing the harvested product on the placing plate (46), and
By vertically swinging the mounting plate (46), the container (Z) can be supported in a horizontal posture or a plurality of inclined postures.

The container platform (43) will be described. As shown in FIG. 10 and FIG. 11, the pipe (51) in a sideways posture and L
A pair of left and right pipes (52) and the pipes (5
A pair of left and right U that are slidably inserted into 1) and (52)
The V-shaped pipe (53), the first net (54a) supported by the horizontal pipe (51) and the L-shaped pipe (52), and the second net supported by the pair of left and right U-shaped pipes (53). Net (54b)
And a pressing bolt (55) for fixing the sliding position of each U-shaped pipe (53).

Therefore, the container placing table (43) can place an empty container or a container (Z) storing the harvested product on each of the pair of left and right container placing portions, and by adjusting the slide of the U-shaped pipe (53). The size of each container mounting part can be changed.

In the figure, (56) is a U-shaped connecting frame that connects the tip portions of the pair of left and right L-shaped pipes (52) so that the boom (2) that is most lowered can be engaged. In addition, a cushion rubber (57) is attached to the inner surface.

[Another embodiment]

INDUSTRIAL APPLICABILITY The present invention can be applied not only to aerial work vehicles, but also to various work vehicles such as a transport vehicle. As the traveling device, traveling crawlers can be used in addition to the wheels (4L) and (4R), and the transmission clutches (25L), (25R), (26L),
As the (26R), various types such as a belt tension type and an occlusal type can be applied.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

Drawing shows an embodiment of a steering structure of a work vehicle according to the present invention,
FIG. 1 is a schematic plan view showing the arrangement of the operating lever and the master cylinder, FIG. 2 is a side view of the mounting portion of the operating lever, and FIG.
FIG. 4 is a front view of the same, FIG. 4 is a schematic view showing a transmission system, FIG. 5 is a schematic view showing an operating structure of a transmission clutch, FIG. 6 is a perspective view showing an operating structure of a traveling brake, and FIG. Fig. 8 is a side view of the work vehicle, Fig. 8 is a side view of the container mounting frame, Fig. 9 is a front view of the same, Fig. 10 is a plan view of the container mounting base, and Fig. 11 is a front view of the same. (11L), (11R) ... Forward transmission clutch, (12L), (12R) ... Reverse transmission clutch, (23L), (23R) ... Forward clutch cylinder, (24L), (24R) ... … Reverse clutch cylinder, (25L), (25R) …… Forward master cylinder, (26L), (26R)… Reverse master cylinder, (28)… Operating lever, (30)… Cylinder operating member .

Claims (1)

[Claims] 1. A forward drive transmission clutch (11L), (11R) and a reverse drive transmission clutch (12L), (12R) are provided in the respective transmission mechanisms of the left and right traveling devices (4L), (4R). , Each of these transmission clutches (11L), (11R), (12L), and (12R) are individually entered and operated along with the extension operation, and the forward and reverse clutch cylinders (23L), (23R), (23R), ( 24L),
(24R) and their clutch cylinders (23L), (23
R), (24L), and (24R) are connected separately to the forward and reverse master cylinders (25L), (25R), (26
L) and (26R) are provided, and an operation lever (28) that is swingable in the front-rear direction and the left-right direction is provided, and the four master cylinders (25L), (25R), (26L), (26R) are provided. )
Of these, forward master cylinders (25L) and (25R) are juxtaposed along the left-right direction in front of the operating lever (28), and backward master cylinders (26L) and (26R)
Are arranged side by side in the left-right direction on the rear side of the operation lever (28), and the master cylinders (25L), (25R), (26L), (26R) are arranged along with the swing of the operation lever (28). ) Is a structure for steering a work vehicle provided with the operation lever (28), in which a cylinder operating member (30) for selectively depressing) is provided with the four master cylinders (25L), (25R),
(26L) and (26R) are for operating a work vehicle that is arranged so as to correspond to traveling devices in which the front and rear side-by-side ones of the operation levers (28) are different from each other. Structure.