JP2622246B2 - Backhoe - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a swivel that is rotatable about a vertical axis with respect to a traveling machine base, and a backhoe device is provided at the front of the swivel. The present invention relates to a backhoe having a prime mover at the rear. 2. Description of the Related Art In a backhoe as described above, for example, as shown in FIG. In many cases, the engine E is arranged so as to be orthogonal to the horizontal direction. [0003] In recent years, there has been a demand for work to be performed without difficulty in a narrow work place such as between buildings, so that the size of the entire backhoe and the size of the swivel base have been reduced. Is planned. However, besides the backhoe device, the steering section where the driver sits, the engine, the hydraulic pump, the hydraulic oil tank and the fuel tank, etc. must be arranged on the swivel base, whereas as mentioned above, If the engine is arranged sideways, a portion of the turntable in front of the engine will be narrower than the area of the turntable. [0004] When the engine is disposed laterally behind the swivel, the size of the swivel can be reduced,
It is in a state where it is difficult to dispose necessary components such as the above-mentioned control unit on the turntable. An object of the present invention is to provide a backhoe with a configuration in which the necessary components such as the above-described control unit can be arranged on the swivel base while reducing the size of the swivel base. A feature of the present invention resides in the following configuration of the above-described backhoe. Equipped with a swivel that is rotatable around the vertical axis with respect to the traveling machine base, a backhoe device is provided at the front of the swivel,
The rear part of the swivel base is formed in a convex shape protruding rearward in plan view, and a driving part is provided at the rear part of the swivel base, and a hydraulic pressure is applied to one end of a crankshaft rotation axis of an engine disposed on the driving part. A pump is provided, and the engine is arranged in a state in which the crankshaft rotation axis extends in the horizontal direction of the swivel table, and the hydraulic pump side of the crankshaft rotation axis is positioned rearward of the other end side. In a backhoe, a hydraulic pump is often provided at one end of a rotation axis of a crankshaft of an engine, and the hydraulic pump is provided with a horizontal width of the engine (in a direction orthogonal to the rotation axis of the crankshaft). Many are narrower than width. Therefore, when the engine and the hydraulic pump are arranged in an inclined posture on the swivel base as in the present invention, it becomes possible to arrange the engine along the rear outer edge of a convex curved portion projecting rearward at the swivel base. The fact that the hydraulic pump is narrower than the lateral width of the engine also allows the hydraulic pump provided at the end of the engine to be arranged along the rear outer edge of the swivel. As a result, the gap between the rear outer edge of the swivel base and the engine is narrowed, and the portion of the swivel base in front of the engine is wider than the conventional structure shown in FIG. be able to. If the power from the engine is transmitted to each part by a gear, a transmission shaft, and the like, setting and disposing a transmission system from the engine to each part is difficult if the engine is disposed in an inclined posture as in the present invention. Become something. On the other hand, in the backhoe, each part is driven by hydraulic oil from a hydraulic pump driven by an engine, and hydraulic oil from the hydraulic pump is supplied to each part by a hose or a pipe. Even if the engine and the hydraulic pump are arranged in an inclined position as in the above, it is only necessary to set the direction of the hose and pipe from the hydraulic pump to an appropriate one, and there is no hindrance to the supply of hydraulic oil from the hydraulic pump to each part. . [0008] As in the present invention, the engine is arranged in an inclined position in which the hydraulic pump side of the crankshaft rotation axis is located rearward of the other end side, and the engine and the hydraulic pump are arranged along the rear outer edge of the swivel base. In this case, the position of the engine with respect to the swivel table moves rearward from the conventional structure shown in FIG. This allows the engine to effectively function as a balance weight at the rear of the swivel on the swivel having the backhoe device at the front. Furthermore, since the hydraulic pump, which is a relatively heavy object, is located behind the engine, the hydraulic pump also effectively functions as a balance weight at the rear of the swivel. In the backhoe, an opening / closing section may be provided at the rear of the swivel for inspection and maintenance of the driving section. With this configuration, when the engine is disposed in an inclined position in which the hydraulic pump side of the crankshaft rotation axis is located rearward of the other end side as in the present invention, the hydraulic pump is provided with an opening / closing unit at the rear of the swivel base. Is arranged near the opening / closing part, so that the maintenance and inspection of the hydraulic pump becomes easy. As described above, the engine and the hydraulic pump are arranged on the swivel base in an inclined posture, so that the engine and the hydraulic pump can be arranged along the rear outer edge of the swivel base. This makes it possible to widen the front part of the swivel platform from the engine. Therefore, by arranging the control unit and the like in this wide front part, it is possible to reduce the size of the swivel base while maintaining the necessity of the control unit and the like. Things can now be easily placed on the swivel. The engine and the hydraulic pump, which is a relatively heavy object, can function effectively as a balance weight at the rear of the swivel base, so that the stability of the backhoe during work and the stability during swivel at the swivel base are improved. I was able to. When the opening and closing section is provided at the rear of the swivel, the hydraulic pump is arranged near the opening and closing section, so that the inspection and maintenance of the hydraulic pump, which is relatively frequently performed, can be easily performed. Serviceability can be improved. An embodiment will now be described. As shown in FIG. 1, a swivel 4 having a backhoe device 1 at the front, a driving unit 2 at the rear and an operating unit 3 at substantially the center, and a tire-type traveling device 6 (dosing machine platform) having a dozer device 5 are provided. ), A bracket 1a on the base end side of the backhoe device 1 is attached to the swivel base 4 so that the left and right angles can be freely changed, and a backhoe capable of earth removal work and digging a side groove is provided. Make up. As shown in FIGS. 1 and 2, the rear portion of the swivel base 4 is formed in a convex shape projecting rearward in a plan view. The engine E, the hydraulic device, and the like are covered by a fixed bonnet 7 also serving as a support frame and fixed to the fixed bonnet 7 and a movable bonnet 8 attached to the fixed bonnet 7 so as to be freely opened and closed by swinging up and down. As shown in FIGS. 2 and 3, the crankshaft rotation axis S of the engine E extending in the lateral direction of the swivel 4 is shown.
A radiator 9 for cooling the engine E and a fan 10 are arranged at one end of the engine E, and a pump portion 11 of a driving HST (not shown) of the traveling device 6 and a backhoe are arranged at the other end of the crankshaft rotation axis S. Hydraulic pumps P1, P2, and P3 for driving the apparatus 1 and the dozer apparatus 5 and the like are arranged side by side in the direction of the crankshaft rotation axis S and integrally attached, and a hydraulic cylinder 12 for gear shifting operation is provided on the pump portion 11. ing. As shown in FIG. 2, the crankshaft rotation axis S is disposed so as to be more distant from the front wall portion 7a of the fixed bonnet 7 toward the hydraulic pumps P1, P2, and P3 than the fan 9 is. And the front wall portion 7a and the hydraulic pump P while reducing the front-rear dimension l of the movable bonnets 7,8.
1, the gap between P2 and P3 is increased, and the hydraulic system components 13, such as an oil filter, a hose and a connector,
A fuel system component 14 such as a fuel filter and a hose, an electrical component 15 and the like are arranged. As shown in FIGS. 2 and 3, the hydraulic pump P1 at the tip is disposed close to the revolving frame 4a and wraps in the vertical direction, so that the hydraulic pump P1 is assembled and disassembled. When moving in the direction of S, a part 4b of the revolving frame 4a is swingably attached by a hinge 16 so that the revolving frame 4a does not become an obstacle, and a lock pin 17 for fixing the part 4b in a closed posture is provided. . By arranging the engine E in an inclined position, the fixed bonnet 7 does not hinder the assembly and disassembly of the hydraulic pump P1. For example, unlike the case where a swinging portion is provided on the fixed bonnet 7, the strength of the fixed bonnet 7 is not reduced, so that the fixed bonnet 7 is provided with sufficient strength as a support frame. Another Embodiment Next, another embodiment will be described. Hydraulic pumps P1, P2, P3
The number of installations does not matter. In the case of a backhoe provided with the crawler-type traveling device 6, the pump portion 11 of the driving HST of the traveling device 6 may be omitted. The components arranged between the fixed bonnet 7 and the hydraulic pumps P1, P2, P3 can be appropriately selected, as long as they include at least the hydraulic system components 13. The specific structure and mounting structure of the fixed bonnet 7, the movable bonnet 8, the revolving frame 4a and the like can be appropriately changed. For example, the opening / closing direction and the opening / closing structure of the movable bonnet 8 are appropriately changed, and the opening / closing portion 4b of the revolving frame 4a is detachably attached to the bolt 1 as shown in FIG.
8 or may be omitted. The type of backhoe does not matter. In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a backhoe. FIG. 2 is a cross-sectional plan view of a driving unit. FIG. 3 is a longitudinal rear view of a driving unit. FIG. FIG. 5 is a cross-sectional plan view of a conventional drive unit. [Description of References] 1 Backhoe device 2 Drive unit 4 Revolving base 6 Traveling machine base E Engine S Crankshaft rotation axis cores P1, P2, P3 Hydraulic pump

Claims (1)

(57) [Claims] A turning table (4) rotatable around a vertical axis with respect to a traveling machine table (6), and a backhoe device (1) is provided in front of the turning table (4). And projecting rearward from the rear of the swivel table (4) in a plan view.
And a driving part at the rear of the swivel (4).
(2) , and hydraulic pumps (P1), (P2), (P3) are provided at one end of the crankshaft rotation axis (S) of the engine (E) disposed in the driving portion (2). ), The engine (E) is in a state where the crankshaft rotation axis (S) extends in the horizontal direction of the swivel table, and the hydraulic pumps (P1),
The (P2) and (P3) sides are inclined rearward from the other end side.
Backhoe placed in an oblique position .