JP2565330Y2 - Work vehicle for traveling on slopes - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention is for running on steep terrain such as underground shopping malls where stairs etc. are run for fire extinguishing and rescue in the event of a fire or personal injury, enabling these vehicles to enter the underground shopping mall. Work vehicle.

[0002]

2. Description of the Related Art Two hydraulic motors are provided, each of which has four hydraulic motors for driving four traveling crawlers disposed in front, rear, left and right, and two hydraulic pumps for supplying hydraulic pressure to each of two hydraulic motors.
In a hydraulic four-stage continuously variable transmission mechanism of a pump 4 motor type, in which a flow dividing valve is interposed between one pump and two motors, for example, a flow dividing valve for driving the left and right crawlers is provided on the body. Centrally deployed on the left and right sides respectively.

[0003]

However, in such an arrangement, the hydraulic hose is concentrated in a limited space, and the hose is bent at a sharp angle.
There were drawbacks such as making the hose piping extremely complicated, resulting in inefficiency and inconvenient maintenance and inspection.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a structure in which a vehicle travels by driving four traveling crawlers in front, rear, left and right by a hydraulic stepless transmission mechanism comprising a hydraulic pump and a hydraulic motor. And four hydraulic motors mounted on each traveling crawler to drive each crawler, and two hydraulic motors for the front and rear crawlers on the left and right sides.
The transmission mechanism includes two left and right hydraulic pumps that supply an equal amount of hydraulic pressure through two left and right flow dividing valves, and the hydraulic pump is disposed substantially at the center of the machine body, and the left crawler flow dividing valve is connected to the right side of the machine body. In addition, by disposing the right crawler flow dividing valve at a position substantially symmetrical with respect to the center line on the left side of the body, the hose connecting the hydraulic pump and the left and right side hydraulic motors has a proper curvature and a proper length. In addition, the pipes can be efficiently piped using the same left and right parts, so that the types of hoses used can be reduced. Can be improved in the left-right balance.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 is an explanatory plan view of a traveling unit, FIG. 2 is an overall side view of a work vehicle, FIG. 3 is an explanatory side view of the same, FIG.
FIG. 5 is an explanatory front view, wherein (1) is a work vehicle for traveling on a slope, and (2) is a driver's seat (3) and a driving operation unit (4).
And (5) a machine base for supporting left and right front crawlers (6) and (7) and rear crawlers (8) and (9), and (10) a driving cabin (2). An engine having a radiator (12), an oil cooler (13) and the like disposed in an engine room (11) at a lower rear portion of the engine, (14) is disposed on the left side of the engine (10) in the engine room (11). Water pump for fire extinguishing and discharging
(15) a fuel tank disposed on the right side of the engine (10) in the engine room (11); (16) a work machine installation base also serving as a room upper cover of the engine room (11); Is a fire hose device which is a working machine installed on the mounting table (16).

The operating cabin (2) is supported on the machine (5) so as to be capable of pitching, that is, swinging back and forth, and is provided at the front end of the machine (5) via a front fulcrum shaft (18). 19) and the upper part of the rear end of the first cabin table (19) via a rear fulcrum shaft (20).
1) The rear end rising portions (21a) are connected to each other, the floor surface (22) of the operating cabin (2) is fixed to the second cabin table (21), and the machine base (5) and the first cabin table are fixed. A first elevating cylinder (25) for tilting the cabin forward is provided between each of the support shafts (23) and (24) between substantially the center of the inside of (19), and the outside of the first and second cabin tables (19) and (21). A second elevating cylinder (28) for backward tilting of the cabin is interposed between the support shafts (26) and (27) substantially at the center, and one of the cylinders (25) and (28) is extended. The cabin (2) is configured to be inclined forward or backward about the front or rear fulcrum shaft (18) (20). When the operating cabin (21) is tilted rearward, the rear fulcrum shaft (20) is provided at a high position (upper front of the engine room (11)) so that the rear surface of the cabin (21) at the time of tilting rearward. The traveling amount (L) of the working vehicle (1) is suppressed to a minimum so that the working vehicle (1) has a sufficient space for mounting the working machine on the mounting table (16) without extending the entire length of the machine. It is composed.

[0007] The cabin (2) has a floor (22).
Are formed on the floor surface (22).
a) (22b) Driver's seat (3) and rear seat (2
9), and a hydraulic tank (30) and a battery (31) to be mounted on the machine base (5) are arranged below the projections (22a) and (22b), so that the body can be made compact and the body can be balanced. It is configured to stabilize.

As shown in FIGS. 6 to 8, the front left and right crawlers (6) and (7) are used to move the front and rear floating and driving sprockets (32) and (33) and the intermediate track roller (34).
The rear crawlers (8) and (9) are provided with front and rear drive and idle sprockets (33) and (32) and intermediate track rollers (3).
4) are respectively provided on the track frame (35), and the front and rear horizontal pipes (36) (3)
7), a substantially central portion of each track frame (35) is connected and supported so as to be rotatable back and forth through a rotation fulcrum shaft (38);
Each of the crawlers (6), (7), (8) and (9) is supported by a fulcrum shaft (38).
Are configured to be rotatable forward and backward, respectively, around the center.

The crawlers (6), (7), (8)
(9) The crawler rotating hydraulic cylinders (39) are interposed between the horizontal pipes (36) and (37) and the track frames (35) to forcibly move the crawlers (6) to (9) in the front-rear direction. To each cylinder (3
9) is protruded in the lateral direction on the inner side surface of each track frame (35) so as to be disposed inside the body of the track frame (35) and within the width (W) of each crawler (6) to (9). Bracket (40) and horizontal pipe (36) (3
7) Hydraulic cylinder (39) is provided between brackets (41) projecting downward at both left and right ends via support shafts (42) and (43) to force crawlers (6) to (9) forward and backward. It is configured to be rotatable and to protect each cylinder (39) safely from external obstacles within the width (W) of the crawlers (6) to (9).

Further, a stopper (44) for regulating the amount of rotation of each of the crawlers (6) to (9) is provided within the width of the left and right spaces between each hydraulic cylinder (39) and the track frame (35). A stopper (44) made of a pin projecting to the inside of the machine is fixed to a stopper bracket (45) fixed to the inner side surface of the frame (35), and a regulating plate (44) fixed to the horizontal pipes (36) and (37). 46)
The stopper (44) is inserted into and engaged with the long hole (47) of the stopper (44), and the crawlers (6) to (9) are rotated back and forth within an allowable movement range within the long hole (47) of the stopper (44). It is configured to perform.

Further, the rear horizontal pipe (37) is detachably fixedly supported on the machine base (5) via a bracket (48), and the front horizontal pipe (36) is mounted on the left and right sides of the machine base (5). A center pin (49) provided at the center is swingably supported through a pivot plate (36a) so that only the left and right front crawlers (6) and (7) can swing left and right. .

As shown in FIG. 9, each of the crawlers (6), (7), (8) and (9) is a hydraulic stepless transmission (HS).
T) (50), a left-right independent four-axis drive system, and two left-right hydraulic pumps (51a) (51) of a tandem pump (51) that are drivingly connected to the engine (10).
b) The left and right front and rear crawlers (6) (8)
(7) Each drive sprocket (33a) (33) of (9)
c) Hydraulic motors (52), (54), (53), and (55) for driving (33b) and (33d) are connected to the left and right via diversion valves (56) and (57), respectively, and a hydraulic pump ( The hydraulic pressures from the hydraulic motors (5a) and (51b)
2) Divide valves (56) (5) to (54) and (53) (55)
7), the front and rear crawlers (6), (8), (7), and (9) on the left and right sides are synchronously driven.

As shown in FIG. 1, the tandem pump (51) is disposed substantially at the center of the body of the work vehicle (1), and the right diverter for driving the right crawlers (7) (9) is provided on the left side of the body. A tandem pump (51) is provided with a valve (57) and a left diverter valve (56) for driving the left crawlers (6) and (8) on the right side of the fuselage. Left and right hydraulic pumps (51a) (51
b) Forward high-pressure discharge side and left and right flow dividing valves (56) (57)
Are connected via left and right pump hoses (58) and (59), respectively, and the left and right diverter valves (56) and (57) and the left and right crawlers (6) (8) and (7) (9) Hydraulic motors (52) (54) and (53) (55)
High-pressure hose (58a) (58b)
・ They are connected via (59a) and (59b), respectively, and the forward back pressure outlet sides of the hydraulic motors (52), (54), (53) and (55) and the back pressure inlet sides of the hydraulic pumps (51a) (51b) And low pressure hoses (60a) (60b) and (61a)
(61b), two pumps and four pumps
The traveling speed of the working vehicle and forward / backward movement are controlled by rotation and forward / reverse control by a motor-type continuously variable transmission mechanism (50).

The hydraulic motors (52), (54).
(53) High-pressure hose (58a) connected to (55) (5)
8b) · (59a) (59b) and low pressure hose (60
a) Each intermediate part of (60b), (61a) and (61b)
At a position below the horizontal pipe (36) (37), the pipe (36)
The hoses (58a), (58b) and (59a) (59b) are arranged so as to be along the left and right longitudinal directions of (37).
And (60a), (60b), (61a), and (61b), the motor connection end side is bent in the longitudinal direction of the fuselage near the rotation fulcrum shaft (38), and each motor (5) is passed under the fulcrum shaft (38).
2) Low-position motors (52) which are provided so as to be connected to (54), (53) and (55) and are mounted on the track frame (35) via a motor case (62).
(54), (53), (55), and the hoses (58a), (58b), (59a), (59b), and (60a) when the crawlers (6), (7) rotate back and forth. (60b) ・ (61a) It is configured to minimize the deformation and torsion occurring in (61b).

The driving sprocket (33) is a motor (52) (54) mounted on a motor case (62).
-Each rotating part (52a) (54a) of (53) and (55)
(53a) and (55a) are integrally connected.

Further, a solenoid-operated hydraulic switching valve (6) is connected to the first and second lifting cylinders (25) and (28).
3) A constant discharge hydraulic pump (65), which is drivingly connected to the engine (10) via (64), is hydraulically connected to the engine (10) to raise and lower a lever (66) and a traveling speed change lever (66) provided in the operation section (4). 67) via an electric system and a wire system,
The switching valves (63) (64) and the speed change mechanism (50) are connected to each other so that the operation of the levers (66) (67) enables the horizontal control of the driving cabin (2) and the shifting of the traveling speed. Make up.

In this embodiment, the crawlers (6), (7), (8), and (9) are connected to the fulcrum shafts (38) while traveling on an inclined road such as a staircase. Can be rotated around the road surface around the road to perform traveling while exhibiting a stable and traction force to the maximum, and by keeping the traveling cabin (2) horizontal during traveling, it is safe and reliable. Driving operation can be performed.

In this case, the driving cabin (2)
By making only the movable, the pitching control amount can be kept small and the total height change can be made small, and the operating cabin (2) can be connected to the front and rear fulcrum shafts (18) (20).
The driving cabin (2) is controlled by performing pitching control for moving only the upper side around the two fulcrums.
Therefore, the interference on the lower side of the driving cabin (2) is avoided, and it is not necessary to secure a space below the operation cabin (2) for the pitching control, and the overall height can be suppressed to a minimum.

Further, by providing the fulcrum shaft (20) at the time of tilting the operating cabin (2) rearward at a high position in front of the engine room (11), the rearmost surface of the operating cabin (2) at the time of tilting rearward is provided. The amount of rearward movement (L) can be minimized, and the work mounting space on the installation base (16) can be maximized.

Further, in the piping system of the continuously variable transmission mechanism (51), a left diversion valve (56) for driving the left crawlers (6) (8) is provided on the right side of the machine body and the right crawler (7).
(9) A hose (58a) connected to each of the hydraulic motors (52) to (55) by arranging a right diverting valve (57) for driving on the left side of the fuselage substantially symmetrically with respect to the fuselage center line.
(58b) ・ (59a) (59b) and (60a) (6
0b), (61a) and (61b) can be piped efficiently with the appropriate curvature and the appropriate length, using the same product on the left and right. Therefore, the number of types of hoses used can be reduced to the minimum number, which is economical and maintenance-friendly. In addition, since the heavy objects in this drive system are arranged symmetrically, the left-right balance of the body can be improved, and the diverting valves (56) (57) can be used for forward work (frequently used for reverse work). (Less) and efficiently used on the high-pressure side with good branching accuracy to reduce weight and cost.

[0021]

As is apparent from the above embodiments, the present invention provides four traveling crawlers (6), (7), (7) and (4) by a hydraulic stepless transmission mechanism (50) comprising a hydraulic pump and a hydraulic motor. 8) In the structure in which the body is driven by driving (9), each traveling crawler (6) (7)
(8) Four hydraulic motors (52), (53), (54), and (55) that are installed in (9) and drive each crawler
And the left and right front and rear crawler hydraulic motors (52)
(54), (53) and (55) are provided with two right and left flow dividing valves (5
6) The speed change mechanism (50) includes two left and right hydraulic pumps (51a) (51b) for supplying an equal amount of hydraulic pressure via (57), and the hydraulic pumps (51a) (51b).
, And the flow dividing valve for the left crawler (56) is disposed on the right side of the fuselage, and the flow dividing valve for the right crawler (57) is disposed substantially symmetrically with respect to the fuselage center line on the left side of the fuselage. Hydraulic pump (51a)
(51b) and left and right hydraulic motors (52) (54)
Hose (58a) (5) connecting (53) and (55)
8b) ・ (60a) ・ (60b) can be efficiently piped with the appropriate curvature and length, and using the same left and right products.
Therefore, use hoses (58a) (58b) and (60a)
The type of (60b) can be reduced, and not only can the layout, economy and maintenance be good, but also the hydraulic motors (52), (54) and (53).
(55) and the diversion valves (56) and (57) are arranged in such a way that the heavy objects of the piping system are arranged substantially symmetrically, thereby achieving a remarkable effect such that the right-left balance of the body can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of a traveling unit.

FIG. 2 is an overall side view of the work vehicle.

FIG. 3 is an explanatory side view of the work vehicle.

FIG. 4 is an explanatory plan view of a work vehicle.

FIG. 5 is an explanatory front view of the work vehicle.

FIG. 6 is an explanatory side view of a traveling unit.

FIG. 7 is an explanatory side view of a crawler rotating unit.

FIG. 8 is an explanatory plan view of a crawler rotating unit.

FIG. 9 is a hydraulic circuit diagram.

[Explanation of symbols]

 (6) (7) (8) (9) Crawler (50) Continuously variable transmission mechanism (51a) (51b) Hydraulic pump (52) (53) (54) (55) Hydraulic motor (56) (57) Dividing valve

Claims (1)

(57) [Scope of request for utility model registration] 1. A structure in which four traveling crawlers (front, rear, left and right) are driven by a hydraulic stepless speed change mechanism including a hydraulic pump and a hydraulic motor to travel the vehicle body. The transmission mechanism comprises: four hydraulic motors for driving the crawler, and two left and right hydraulic pumps for supplying an equal amount of hydraulic pressure to the left and right front and rear crawler hydraulic motors via two left and right flow dividing valves, The hydraulic pump is disposed substantially in the center of the fuselage, the left crawler flow dividing valve is disposed on the right side of the fuselage, and the right crawler flow dividing valve is disposed substantially symmetrically with respect to the left fuselage center line. Work vehicle for traveling on slopes.