JP2003291865A - Crawler type working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the operability of a travelling speed change lever of a crawler type working vehicle. <P>SOLUTION: Two traveling speed change levers 18, 18 are disposed to be biased to on side of the front of a driver's seat 6, operating tools 20, 21 for elevating a working machine are disposed on the other side of the driver's seat 6. A meter panel 16 is disposed facing to the driver's seat 6, and the travelling speed change levers 18, 18 are disposed on the side of the meter panel 16 not to intercept the visual field of the driver. Further, a bisector A of an operating angle from the travelling neutral position N of the travelling levers 18, 18 to the forward highest speed position F thereof is set to intersect substantially perpendicularly to the horizontal line B of the machine body. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling speed change lever for a crawler type work vehicle.

[0002]

2. Description of the Related Art Conventionally, this type of crawler type work vehicle has been
The left and right drive wheels are driven by a hydrostatic continuously variable transmission (HST), and the shifting operation is performed by the left and right traveling speed change levers arranged side by side in the approximate center of the front of the driver's seat. The operation tools and various switches that need to be operated when performing various kinds of work are centrally provided. Furthermore, a meter panel is provided at the front facing position of the driver's seat.

[0003]

However, since the left and right traveling speed change levers are collectively provided on the right side of the driver's seat with various levers, switches, etc., they cannot be operated by the left hand. In the state where the traveling gear shift lever is provided mainly at the center of the front of the driver's seat, the wrist is greatly twisted when operated with the left hand, and the usability is poor. In addition, when performing a turning operation of the machine body, since the traveling speed change lever is operated with the left hand and the lifting operation of the working machine is operated with the right hand at almost the same time, these operations must be performed in an unnatural posture. The operation could not be performed smoothly. Further, if the left and right traveling speed change levers are provided in the central portion in front of the driver's seat, the position of the meter panel provided in the central portion in front of the driver's seat will also overlap, and the driver will be able to check various indications on the meter panel. There was a case where it became an obstacle. An object of the present invention is to improve the above conventional problems.

[0004]

In order to achieve the above object, in the present invention, two traveling speed change levers are arranged eccentrically to one side in front of the driver's seat and the other side of the driver's seat is located on the other side. First, the operation tool for raising and lowering the work machine was placed in
It is a feature of.

Further, a meter panel is arranged so as to face the driver's seat, and two traveling speed change levers are deviated to one side in front of the driver's seat which is a side not hindering the driver's visual field. The second feature is that they are arranged in the same manner.

Further, the bisector of the operation angle from the traveling neutral position of the traveling speed change lever to the forward maximum speed position is set so as to intersect the horizontal line of the machine body at a substantially right angle, and the reverse neutral speed position from the traveling neutral position. The third feature is that the operation angle up to is set from the running neutral position to the driver's seat side which is the rear side of the aircraft.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall side view of an agricultural tractor that is a crawler-type work vehicle according to the present invention, and FIG. 2 is a rear view of the same. 1 is a tractor as a work vehicle, 2 is a machine frame, and 2 is a machine frame. Like a normal tractor, is equipped with a hood 4, a cabin 5, etc. in which an engine 3 is installed from the front, and inside the cabin 5,
The driver's seat 6 is provided with a driving control unit 7 including various operating tools and various switches to be described later.

Further, a working machine lifting device 8 for mounting working machines for performing various agricultural works and the like is provided at a lower rear portion of the cabin 5. That is, the working machine lifting device 8 includes a pair of left and right lift arms 10 and 10 rotatably supported on the upper portions of a pair of mounting plates 9 and 9 standing on the rear portion of the tractor 1.
A lift rod 11, is attached to the tip of the lift arm 10, 10.
Left and right lower links 12, 12 connected via 11
And the left and right lift cylinders 13, 13 whose lower ends are connected to the machine body frame 2 and whose upper ends are connected to the middle portions of the left and right lift arms 10, 10, and are commonly used for the working machine lifting device 8. A three-point link hitch is also commonly used. Further, the lower parts 14, 14 are crawler traveling devices provided on the left and right.

Next, FIG. 3 is a plan view of the above-mentioned driving control section 7, and in the front facing the driving seat 6 at the rear center,
Meter panel 16 with various instruments and lamps
There is an engine control lever 17 that adjusts the rotation speed of the engine 3 that is inclined and extended to the right in the lower part on the driver's seat 6 side in front of the center of the vehicle. Left and right traveling speed change levers 18, 18 for traveling / shifting the crawler traveling devices 14, 14 are arranged. Then, the traveling speed change lever 1 in this case
The positions of the positions 8 and 18 are between the front of the left arm of the driver sitting in the driver's seat 6 and the center position of the driver's seat 6 in the left-right direction, and are also within a range in which the operation with the right hand is possible. Furthermore, the engine control lever 17 and the traveling speed change lever 1
Reference numerals 8 and 18 are arranged at positions laterally offset so as not to obstruct the visual field when the driver checks the meter panel 16.

On the left side of the driver's seat 6, there is provided a PTO gear shift lever 19 for shifting the working machine. On the right side, a position control lever 20 for lifting the working machine and a working machine are set from the front. A quick-up switch 21 for forcibly ascending or descending is provided at the upper limit position and the lower limit position set by the position control lever 20, and behind that is the adjustment of the working depth of the rotary tiller, which is the main working machine of the tractor 1. The PTO changeover switch 23 for turning on and off the working depth setting volume 22 and the working machine power, and a plurality of external hydraulic operating levers 24 for switching the oil supply to the working machine which is hydraulically operated further behind it.
Etc. are equipped.

Next, FIG. 4 shows the positional relationship between the driver and the traveling speed change levers 18 and 18 provided on the driving column 26 in front of the driver when the driver sits on the driver's seat 6 and operates the tractor 1. The principal part side view of the driving control part 7 to show is shown. Here, the traveling speed change levers 18, 18 are operated to rotate in the front-rear direction about the rotation fulcrum 27. The solid line position is the traveling neutral position N, and the front side thereof is the forward movement position of the machine body.
Further, the rearward position is the reverse position R, and the larger the operation angle from the traveling neutral position N, the faster the forward maximum speed position F or the reverse maximum speed position R and the traveling speed. The operation is connected to each control lever 29 shown in the hydraulic circuit of FIG. 5 through a connecting means such as push-pull wires 28, 28 extending downward, and the control lever 29 is connected to the main pump 30 via a servo mechanism. By changing the pump swash plate 31, changing the rotation direction and speed of the motor 32,
The left and right crawler traveling devices 14, 14 are separately driven by the sprockets driven by the motor 32. Incidentally, 34 in FIG. 4 is a lower rear cover of the operating column 26, and 35 is a frame to which the column 26 is attached.

In the operation of manipulating the travel speed change levers 18 and 18, the operation from the travel neutral position N, which is frequently used, to the forward most speed position F is performed in a substantially horizontal direction without force, and stable travel speed change is performed for a long time. I can do it and it is hard to get tired. That is, as shown in FIG. 4, the traveling speed change levers 18 and 18 are arranged so that the bisector A of the operating angle from the traveling neutral position N to the forward maximum speed position F intersects the horizon B of the machine body at a substantially right angle. Set, and the reverse speed fastest position R from the running neutral position N
Is set to the driver's seat 6 side, which is the rear side of the aircraft from the traveling neutral position N, and the grip position of the traveling levers 18, 18 is moved forward from the traveling neutral position N for the frequently used forward side operation. By making the vehicle move substantially horizontally to the fastest position F, the force operated by the driver on the traveling speed change levers 18, 18 becomes a force in a substantially tangential direction in the arc of the grip so that the operation can be performed efficiently. There is. Further, in the operation from the traveling neutral position N to the reverse speed fastest position R,
By making it to the driver's seat 6 side which is the rear side of the aircraft,
By setting the traveling speed change levers 18, 18 in the direction closest to the driver, a force of pushing down is required, and conversely,
When the travel speed change levers 18, 18 are returned to the travel neutral position N direction, the force of pushing up is required, so the arm angles are set to be substantially right angles, and neither force is necessary. Not.

The crawler type work vehicle of the present invention is constructed as described above, and the driver starts the engine 3 and mounts the working machine on the working machine lifting device 8 behind the tractor 1 as appropriate. When traveling to a field or the like, the engine control lever 17 is operated to appropriately increase the rotation of the engine 3 so that the two traveling speed change levers 18 and 18 on the left front of the driver can be operated simultaneously with the left hand, or Use both hands to move forward and backward. When the work start position is reached in the field, the work implement lifting device 8 at the rear is lowered to drive the work implement to start the work. At this time, use the PTO gearshift lever 19 in advance with your left hand.
The rotation is set and various operation settings on the right side of the driver's seat 6 are performed with the right hand. That is, the working depth of the working machine is set by the working depth setting volume 22, and the working machine is driven by turning on the PTO switch 23.

When turning the tractor 1 in the field, it is necessary to raise the working machine once, but at this time, the operation with the right hand is required. Therefore, in order to increase the work efficiency, the turning operation and the raising / lowering operation of the working machine are required at the same time. In this case, the driver uses the left hand to move the traveling speed change lever 18 on the inner side of the turning to the forward movement till then. From the position to the traveling neutral position N side, or further to the reverse position, the position control lever 20 or the quick up switch 21 is operated with the right hand to raise the working machine to make the machine turn, and the turn is completed. Then, the working machine is lowered again, the traveling speed change lever 18 is returned to the original speed change position, and straight traveling is performed. In the field work, the same operation as described above is repeated many times.

Therefore, when the tractor 1 is turned, the two traveling speed change levers 18, 18 in front of the driver's left hand are used.
It is possible to improve the work efficiency by turning the tractor 1 while operating either one or both of them with the left hand, and at the same time raising and lowering the working machine with the right hand. Further, since the meter panel 16 is arranged at the front facing position of the driver's seat 6, and the traveling speed change levers 18, 18 are arranged so as to be deviated to the side thereof, the driver's visual field is not seen at all. There is no obstruction, and the various displays on the meter panel 16 are made visible to the driver.

Further, in the operation of manipulating the traveling speed change levers 18, 18, the forward side, which is frequently used, is set to a substantially horizontal direction, and the reverse side, which is relatively infrequent, is set to the pushing direction, with reference to the traveling neutral position N. Driver's travel speed change lever 18,1
No unreasonable force is applied to the control operation of No. 8, stable traveling gear shifting can be performed, and there is no hindrance to long-term driving.

Next, FIG. 6 is a side view of an essential part of the driving column 26 having two traveling speed change lever specifications, and FIG. 7 is an operating portion provided on the right side of the driver's seat 6 also having two traveling speed change lever specifications. FIG. 8 is a side view of an essential part of a conventionally known round handle specification operating column 26 and transmission 36 part. Fig. 6 shows a comparison of these two types of tractors.
The two travel gearshift lever specifications shown in FIG. 7 are
The column portion of the round handle specification of FIG. 8 is also used so that it is possible to cope with those having different specifications by simply replacing the parts of both.

That is, in FIG.
, Which is also used for most of the above, and when changing from the one with the round handle specification in FIG. 8 to the specification with two traveling speed change levers in FIG.
Needless to say, the round handle 37 is changed to the two traveling speed change levers 18, 18, but the meter panel 16 on the outer surface of the operating column 26 and various instruments and switches mounted therein and the panel cover 38 are also included. ， Bottom rear cover 3
4 and the frame 35, etc., are also used for the same purpose.

Then, when the component block 39 constituting the round handle 37 is recombined with the two lever assembly 40 in which components have been assembled in advance, the bolts 41, ... It is necessary to replace the push-pull wires 28, 28 connected to the control lever 29, and a gap generated between the push-pull wires 28 and 28 is covered with a rubber boot 42 of a fit type.

Further, in the case of the round handle specification of FIG. 8, since the traveling speed change lever 43 of the right operation portion of the driver's seat 6 is not necessary in the case of the two traveling speed change lever specification, it is installed at the upper grip portion of the traveling speed change lever 43. The quick up switch 21 that has been moved to the position shown in FIG. 3 above,
In place of the conventional guide grooved cover 44a, a chevron-shaped cover 44b is provided, the above-mentioned quick up switch 21 is installed on an inclined surface 45 in front of the cover 44b, and a driver's hand is placed on a bent portion 46 in the upper rear part thereof. While making a space to put it,
This is a large curved surface.

Therefore, since most of the operating column 26 is also used, the round handle specification and the two lever specification can be easily replaced, and the use of the combined parts reduces the number of dedicated parts and reduces the cost. Becomes Also, assembling with assembly parts is possible, which facilitates on-site reassembling.
Further, by changing the part of the transmission 36, the driver can place his / her hand on the bent portion 46 of the cover 44b in a natural shape and operate the quick up switch 21 in a stable state.
Moreover, it can be used as a hand rest even when the quick up switch 21 is not operated.

[0022]

As described above, according to the present invention, the two traveling speed change levers 18, 18 are arranged so as to be offset to one side in front of the driver's seat 6 and work is performed on the other side of the driver's seat 6. Since the operating tools 20 and 21 for raising and lowering the machine are arranged, the traveling lever 18,
The operability of the tractor 18 is improved, and in particular, when the tractor 1 is turned, the two traveling speed change levers 18, 18 are operated with one hand while the tractor 1 is turned, and at the same time, the working machine is operated with the other hand. By operating the operating tools 20 and 21 for raising and lowering, it is possible to perform the raising and lowering operation of the working machine without difficulty, and it is possible to perform swiveling swiftly and improve the work efficiency.

Further, a meter panel 16 is arranged so as to face the driver's seat 6, and two traveling speed change levers 18, 18 are provided on the meter panel 16 so as not to obstruct the driver's visual field. Since it is eccentrically arranged on one side in front of the vehicle, the driver can view the meter panel 16 without obstructing the field of view, and the aircraft can be appropriately operated based on various displays on the panel.

Further, the bisector of the operation angle from the traveling neutral position N of the traveling speed change levers 18, 18 to the forward most speed position F is set so as to intersect the horizontal line of the machine body at a substantially right angle,
Further, since the operation angle from the traveling neutral position N to the reverse speed fastest position R is set to the driver's seat 6 side which is the rear side of the aircraft from the traveling neutral position N, the forward gear shift of the aircraft which is frequently used is substantially horizontal. It can be performed by manual operation of, and the operability can be improved.

[Brief description of drawings]

FIG. 1 is an overall side view of an agricultural tractor equipped with a crawler type traveling device of the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is a plan view of the same driving control unit.

FIG. 4 is a side view of a main part of the same driving control section.

FIG. 5 is a hydraulic circuit diagram.

FIG. 6 is a side view of a main part of an operating column having two traveling speed change lever specifications.

FIG. 7 is a side view of an essential part of a right operating portion of a driver's seat having a two-travel speed change lever specification.

FIG. 8 is a side view of a main portion of an operating column having a round handle and a transmission unit.

[Explanation of symbols]

1 tractor 5 cabins 6 driver's seat 7 Driving control section 13 Lift cylinder 14 Crawler traveling device 16 meter panel 18 Travel speed change lever 20 Position control lever 21 Quick up switch 26 Driving column 28 push-pull wire

Claims (3)

[Claims] 1. A displacement of 2 to the front side of the driver's seat (6)
In addition to arranging the traveling speed change levers (18) and (18) of the book, operating tools (20) and (21) for raising and lowering the working machine are arranged on the other side of the driver's seat (6). A crawler-type work vehicle. 2. A meter panel (16) is arranged so as to face the driver's seat (6), and two meter panels (16) are provided.
A crawler-type working vehicle in which the traveling speed change levers (18), (18) of the book are arranged so as to be offset to one side in front of a driver's seat (6) which does not obstruct the driver's visual field. 3. The bisecting line of the operation angle from the traveling neutral position (N) of the traveling speed change levers (18), (18) to the forwardmost speed position (F) is made to intersect with the horizontal line of the machine body at a substantially right angle. In addition, the operating angle from the traveling neutral position (N) to the reverse maximum speed position (R) is set from the traveling neutral position (N) to the driver seat (6) side which is the rear side of the aircraft. The crawler-type work vehicle according to claim 1 or 2.