JP3995517B2 - Crawler traveling vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a traveling lever structure in a crawler traveling vehicle such as a tractor, and more specifically, when operating a pair of left and right traveling levers, the appearance can be improved and the operability can be improved to perform a safe body traveling operation. The present invention relates to a traveling lever structure in a crawler traveling vehicle.
[0002]
[Prior art]
Conventionally, a crawler traveling vehicle in which a pair of left and right crawler traveling devices are installed in the body frame to perform straight traveling of the body and steering in the left and right direction makes it easier to perform a sharp spin turn operation than a left and right steering handle For this reason, the left and right crawler travel devices, which correspond to each of the left and right crawlers independently, are arranged so that they can be operated at the same time with one-handed collective gripping and can be operated simultaneously at the same time. It is known that the aircraft is steered in the left-right direction by running the vehicle so that the amount of operation differs between the two running levers.
[0004]
On the other hand, with the operation of the pair of traveling levers that can be tilted back and forth as described above, a steep spin turn operation can be easily performed, but the crawler traveling device on the inner side of the steering due to the characteristics of the left and right crawler traveling devices when steering in the left and right direction In this case, it may be necessary to call attention to the backward movement of the aircraft, and if the work equipment provided at the rear of the aircraft moves backward while maintaining the landing state, The burden on the work machine increased, leaving room for improvement in terms of work safety with respect to the rear part of the rearwardly moving machine.
[0007]
[Means for Solving the Problems]
The technical means adopted by the present invention includes a link mechanism in which a pair of travel levers that are independently tilted forward and backward are arranged so that they can be operated simultaneously by one-handed collective gripping and connected to the rotating base of each lever. In order to control the left and right crawler travel devices , the forward and backward linear travel is performed by simultaneous tilting operation of the travel levers, and the operation amount is different between the travel levers. While the body is steered , each of the travel levers has a link plate that rotates in conjunction with the forward / backward tilting operation, and a switch that is turned on / off according to the link outer edge shape of each link plate is provided. When the lever is operated in the backward direction from the neutral position, a back lamp for displaying the lever is turned on.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of the present invention will be described in detail based on the embodiments shown in the drawings.
In FIG. 1, reference numeral 1 denotes a crawler tractor provided with a pair of left and right crawler travel devices 2, 2 at the lower part of the body frame 3, and the crawler tractor 1 is not shown in a bonnet 4 provided at the front part of the body frame 3. A driver's seat 6 is provided in a cabin 5 mounted with an engine and disposed substantially at the center of the body frame 3, and a lift arm 8 a and a lift cylinder are provided on a rear wall 7 erected at the rear of the body frame 3. A three-point link mechanism 8 composed of 8b and the like is disposed, and a work machine (not shown) is mounted on the rear part of the crawler tractor 1 so as to be movable up and down.
[0010]
In front of the driver's seat 6, as shown in FIGS. 2 and 3 (b), a driving console 12 in which a travel meter 9, a water temperature gauge 10 a, a fuel gauge 10 b, and various display lamp groups 11 are centrally arranged is arranged. In addition, a pair of traveling levers 13L and 13R that can be independently tilted back and forth are arranged behind the operation console 12 so that they can be operated simultaneously by one-hand gripping by an operator. The crawler tractor 1 performs forward or reverse linear travel by simultaneous tilting operation, and is operated so that the amount of operation differs between the travel levers 13L and 13R, thereby performing left and right body steering.
[0011]
Here, the configuration of the travel levers 13L and 13R will be described. As shown in FIGS. 4 and 5, the levers 13L and 13R have their rotation bases 13L ′ and 13R ′ at both ends of the rotation shaft 14. A metal cover portion 17 is formed in a hollow rectangular tube shape in the vicinity of the driver's seat 6 by pivotally supporting the mechanism portion 16 from the rotation base portions 13L ′ and 13R ′ to the link mechanisms 15 and 15 to be described below. An upper cover body 18a that covers the rotation shaft 14 except for the rotation base portions 13L 'and 13R' of the travel levers 13L and 13R, and supports the upper cover body 18a on the lower surface thereof, and An elastic cover body 18 including a lower cover body 18 b that covers the periphery of the travel levers 13 </ b> L and 13 </ b> R along the shape of the operation console 12 is mounted on the upper end of the cover portion 17.
[0012]
Further, the mechanism portion 16 connects one end of the connection wires 19a and 19a to the reverse action rods 19 and 19 provided on the rotation base portions 13L 'and 13R' of the traveling levers 13L and 13R, respectively, and the other end is operated. Each of the link plates 15a and 15a, which are pivotally supported on the support shaft 15 'of the link mechanism 15 and 15 disposed on the support frame 20 below the console 12, is connected to a connection piece 15b formed integrally with each other. A midway portion of the connection wire 19a is inserted into a cylindrical guide body 21 integrally formed in the cover portion 17, and the connection wire is tilted in the backward direction B from the neutral position N of the travel levers 13L and 13R. When 19a is pulled, a pulling operation is performed by using the rigidity of the connecting wire 19a, with the narrowed portion 21a in the guide body 21 as a fulcrum. Even when the connection between the connecting wire 19a and the link plate 15a cannot be performed with a rod as in the prior art, the connecting structure can be configured by securing the necessary elasticity and rigidity without requiring a return spring or the like. it can.
[0013]
Reference numerals 22 and 22 denote forward action rods provided on the rotation bases 13L ′ and 13R ′ of the traveling levers 13L and 13R, similarly to the reverse movement rods 19 and 19, respectively, and the neutral positions of the traveling levers 13L and 13R. N is provided for the purpose of pulling an unillustrated forward mechanism portion through the connection wire 22a by a tilting operation in the forward direction F from N, and the middle portion of the connection wire 22a is the cover portion 17 as described above. A cylindrical guide body 21 integrally formed therein is inserted.
[0014]
The link plates 15a and 15a constituting the link mechanisms 15 and 15 each have a concave portion 23a formed on the curved outer peripheral edge 23, and an actuator 24 that allows the micro switches SW and SW to freely move is provided in the concave portions 23a and 23a. Are connected by pulling from the neutral position of the link plate 15a shown by the solid line in FIG. 5 (a) to the direction of the solid arrow, that is, by tilting from the neutral position N of the travel levers 13L and 13R to the reverse direction B. When the wire 19a is pulled, the actuator 24 moves relative to the outer peripheral edge 23 from the recess 23a and rides on. When the micro switch SW is turned on and the travel levers 13L and 13R are returned to the neutral position N, the solid line in FIG. By returning to the neutral position of the link plate 15a shown, the actuator 24 is positioned in the recess 23a. Lee black switch SW is configured to be turned OFF.
[0015]
Next, the control circuit 25 including the micro switch SW will be described.
In FIG. 6, the micro switches SW and SW corresponding to the travel levers 13L and 13R are connected to the microcomputer unit 27 via the input circuit 26, and the electromagnetic proportional control valve for raising is driven by a drive signal from the microcomputer unit 27. 28 and the descending electromagnetic proportional control valve 29, and the microswitches SW and SW turn on / off the back lamp 11a among various display lamp groups 11 concentrated on the operation console 12, and It is also used as a switch for turning on / off the back lamp 30 disposed on the rear wall 7 of the crawler tractor 1.
[0016]
Since the present invention is configured as described above, when the traveling levers 13L and 13R are tilted in the forward direction F from the neutral position N when the crawler tractor 1 travels straight in the forward direction, the forward action rod 22 is connected. A forward mechanism (not shown) is operated via the wire 22a, and both the left and right crawler travel devices 2 and 2 travel forward at the same rotational drive speed. At this time, the link plates 15a and 15a of the link mechanism 15 are at a position X indicated by a dotted line in FIG. 5A, and the actuators 24 and 24 of the micro switches SW and SW are separated from the link plates 15a and 15a. Therefore, the micro switches SW and SW are respectively turned off, and the microcomputer unit 27 of the control circuit 25 performs traveling control and operation control of various operations in the normal control mode.
[0017]
Further, when the crawler tractor 1 travels straight in the reverse direction, if the travel levers 13L and 13R are tilted in the reverse direction B from the neutral position N, the connection wire 19a connected to the reverse action rod 19 and the connection piece 15b are used. Each of the link plates 15a and 15a of the link mechanism 15 is rotated from the solid line position shown in FIG. 5A to the Y position shown by a dotted line, and is in elastic contact with the recesses 23a and 23a of the link plates 15a and 15a. The actuators 24 and 24 of the switches SW and SW move relative to the outer peripheral edge 23 from the concave portion 23a, and the micro switches SW and SW are turned on.
[0018]
Then, the contact information of the micro switches SW and SW is transmitted to the microcomputer unit 27 via the input circuit 26, and the microcomputer unit 27 sends the ascending drive signal to the ascending electromagnetic proportional control valve 28, whereby the crawler tractor. A work machine (not shown) mounted on the rear part of 1 through a three-point link mechanism 8 is driven to rise, and a back lamp 11a arranged on the operation console 12 is turned on and lit, and the rear wall 7 of the crawler tractor 1 is turned on. The back lamp 30 disposed on the front side is also turned on, and attention is given to the surroundings that the crawler tractor 1 moves backward.
[0019]
On the other hand, when the operation levers 13L and 13R are operated such that the tilting operation amounts are different, for example, one of the travel levers is tilted forward and the other travel lever is tilted to the neutral position N or the reverse side. In the abrupt spin turn in the left-right direction performed by, either one of the micro switches SW, SW is turned on, and this contact information is transmitted to the microcomputer unit 27 via the input circuit 26, and from the microcomputer unit 27 The raising electromagnetic proportional control valve 28 is driven by the sent raising drive signal, and the working machine (not shown) mounted via the three-point link mechanism 8 is driven to rise, and at the same time, the back lamp 11a is turned on as described above. And the back lamp 30 disposed on the rear wall 7 of the crawler tractor 1 is also lit, so that the crawler tractor 1 is slightly But that was a backward state, it is possible to draw attention to the surrounding fuselage behind, it is possible to improve the safety.
[0020]
In addition to the above-mentioned spin turn, the normal turning operation in the left-right direction in which the amount of forward tilting operation between the traveling levers 13L, 13R is different, the vehicle travels in the same control state as the straight traveling in the forward direction. Will be done.
[0021]
In such traveling of the crawler tractor 1 and the steering operation in the left-right direction, the traveling levers 13L, 13R have their rotation bases 13L ′, 13R ′ covered with the upper cover body 18a of the elastic cover body 18, and Since the upper end of the cylindrical cover portion 17 is similarly covered with the lower cover body 18b, the gap of the cover portion 17 caused by assembly and manufacturing errors and a bolt and nut (not shown) used for assembly are elastic cover body 18. Concealed and functional aesthetics can be improved.
[0022]
Further, the generation of unpleasant chatter noise caused by the contact between the metal members around the operation console 12 is suppressed by the mounting of the elastic cover body 18, and further, the elastic cover body prevents mechanical noise generated during traveling from leaking through the gap. The upper cover body 18a and the lower cover body 18b can be prevented in advance, and the elastic cover body 18 itself can be easily attached and detached, and the maintenance can be improved.
[0023]
【The invention's effect】
In short, according to the present invention, a pair of traveling levers that are independently tilted forward and backward are arranged so that they can be simultaneously operated by one-hand collective gripping, and left and right via a link mechanism connected to the rotating base of each lever. In order to control the crawler traveling device , the forward and backward linear travel is performed by simultaneous tilting operation of the travel lever, and the operation amount is different between the travel levers, so that the left and right direction of the aircraft can be steered. On the other hand, each of the travel levers has a link plate that rotates in conjunction with the forward / backward tilting operation, and a switch that is turned on / off in accordance with the link outer edge shape of each link plate is provided to make the travel lever neutral. When operating backward from the position, it is configured to turn on the back lamp that displays this, so when performing left-right steering or a sudden spin turn When any one of the pair of left and right travel levers enters the operation in the reverse direction and the travel aircraft is in the reverse drive state even a little, the warning that the aircraft will move backward is given to the surrounding area behind the aircraft It is possible to improve safety.
[Brief description of the drawings]
FIG. 1A is a side view of a tractor.
(B) is a rear view of the same as above.
FIG. 2 is a front view of a main part of an operation console.
FIG. 3 (a) is a perspective view of a main part showing a conventional traveling lever mounting state.
(B) is a principal part perspective view which shows the traveling lever attachment state of this invention.
FIG. 4 is a side view of an essential part showing a configuration of a travel lever.
FIG. 5 (a) is an explanatory diagram for explaining the operation of the link mechanism for enlarging the main part.
(B) is the principal part expansion perspective view same as the above.
FIG. 6 is a circuit diagram showing a connection between a travel lever and a control circuit.
[Explanation of symbols]
2 Crawler travel device 6 Driver's seat 11a Back lamp 13L Travel lever 13R Travel lever 13L 'Rotating base 13R' Rotating base 15 Link mechanism 15a Link plate 16 Mechanism section 17 Cover section 18 Elastic cover body 18a Upper cover body 18b Lower cover body 30 Back lamp SW Micro switch (switch)
N Neutral position B Reverse direction

Claims (1)

A pair of travel levers that are independently tilted forward and backward are arranged so that they can be operated simultaneously with one-handed batch gripping, and the travel control of the left and right crawler travel devices is controlled via a link mechanism connected to the rotation base of each lever. In order to perform the forward or backward linear travel by the simultaneous tilting operation of this travel lever, and to operate the aircraft in the left-right direction by operating the two operation levers so that the operation amount is different, Each link plate has a link plate that rotates in conjunction with the forward / backward tilting operation of the travel lever, and a switch that is turned on / off according to the link outer edge shape of each link plate is provided, and the travel lever is operated in the reverse direction from the neutral position. In this case, the crawler traveling vehicle is configured to turn on a back lamp for displaying the same.

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