JP5480345B2 - Transport work vehicle with multiple engines - Google Patents

Description

  The present invention relates to a transport work vehicle useful for carrying out timber in a forest, and in particular, is equipped with at least two engines and uses either one or both of the engines depending on the situation of empty travel or load travel. The present invention relates to a transport work vehicle that is selected to increase the driving efficiency of the vehicle.

  This type of transport work vehicle is generally used for transporting timber from forests, and is mainly supplied with pressure oil from a pair of hydraulic pumps driven by the power of a diesel engine to drive the left and right traveling devices. Left and right hydraulic motors. A transport work vehicle requires an engine with a larger output depending on the load capacity, but it is clear that such a large engine is not originally required when traveling with an empty load.

  The object of the present invention was developed in response to the above situation, and has at least two engines with a total output corresponding to the required load capacity, and in the case of idle driving, It is an object of the present invention to provide a transport work vehicle in which one of the engines is used to improve the operation efficiency of the engine.

  The above object of the present invention is to provide at least a vehicle mounted on a vehicle body in a transport work vehicle including a vehicle body with a cab, a cargo bed provided on the vehicle body, a left and right traveling device mounted on the vehicle body, each driven by a hydraulic motor. Achieved by providing a multi-engine transportation work vehicle including two engines, wherein a hydraulic pump is operated by power of one or both engines, and a hydraulic motor of a traveling device is driven by the pressure oil. Is done.

  According to a preferred embodiment of the present invention, a pair of hydraulic pumps driven by the power of each engine and an opening for supplying pressure oil from the hydraulic pumps to the left and right hydraulic motors drivingly associated with the traveling device. A hydraulic circuit is provided, and the pressure oil of each of the pair of hydraulic pumps, or the pressure oil of each of the other pair of hydraulic pumps is joined to this pressure oil and supplied to the left and right hydraulic motors through the open hydraulic circuit. Therefore, a transport work vehicle with a plurality of engines is provided in which one or both of the two engines are activated.

  According to another preferred embodiment of the present invention, a pair of swash plate hydraulic pumps driven by the power of each engine and left and right hydraulic motors drivingly associated with the traveling device for the hydraulic oil from the swash plate hydraulic pumps. A closed hydraulic circuit for supplying the pressure to each of the pressure oils of one pair of swash plate hydraulic pumps or the pressure oil of the other pair of swash plate hydraulic pumps combined with the pressure oil. In order to supply the left and right hydraulic motors through a hydraulic circuit, one or both of the two engines are activated, and a transport work vehicle with multiple engines is provided.

  In the embodiment of the present invention, the traveling device may be a wheel traveling device or a crawler traveling device.

1 is an overall side view of a wheeled transport work vehicle according to the present invention. It is a top view of the wheel type conveyance work vehicle of FIG. It is the whole crawler type conveyance work vehicle side view of the present invention. It is a top view of the crawler type conveyance work vehicle of FIG. It is the schematic of the hydraulic circuit apparatus by embodiment used for a conveyance work vehicle. It is the schematic of the hydraulic circuit apparatus by other embodiment.

  Referring to FIGS. 1 and 2, there is shown an entire wheel-type transport work vehicle 10A according to the present invention, which is effective for carrying out forest work, in particular, carrying out cut down wood. A vehicle body 14 with a cab 12, a loading platform 16 provided on the vehicle body 14, and left and right traveling devices 18 mounted on the vehicle body 14 are included. The loading platform 16 has a plurality of side support poles 20 for supporting horizontal loading of wood from the side. The traveling device 18 includes a pair of hydraulic motors 22 mounted on the vehicle body, two pairs of left and right wheels 24, and a chain for transmitting the rotation of the hydraulic motor 22 to each pair of wheels 24. Sprocket device 26. Reference numeral 28 denotes at least two diesel engines as power sources mounted on the vehicle body 14 adjacent to the driver's cab 12, and the total output of the two engines is the required load capacity of the vehicle as the engine capacity. Is selected and used in accordance with For example, it is preferable to use two engines with a maximum output of 25 horsepower, but the engines with the same output are not necessarily required.

  3 and 4 show the entirety of the crawler-type transport work vehicle 10B, but metal or rubber or the like that is driven by the drive wheels 30 in which the left and right traveling devices 18 are spanned between the drive wheels 30 and the driven wheels 32. The structure of the vehicle is the same as that of the wheel-type transport work vehicle 10A except that the track is an endless track, that is, the crawler 34, and the description of the structure of the vehicle is omitted. A pair of hydraulic motors 22 mounted on the vehicle body is coupled to the axle of the drive wheels 30 of the traveling device 18.

  Referring to FIG. 5, there is shown a hydraulic circuit device 30A for the transport vehicle shown in FIGS. 1 and 2 or FIGS. 3 and 4, which includes a pair of hydraulic pumps 36 driven by the power of each engine 28, and An open hydraulic circuit 38a that hydraulically associates one hydraulic pump 36a that is drivingly associated with one engine 28a and the other hydraulic pump 36b that is drivingly associated with the other engine 28b with one hydraulic motor 22a. And an open hydraulic circuit that hydraulically associates one hydraulic pump 36a that is drivingly related to the other engine 28b and the other hydraulic pump 36b that is drivingly related to one engine 28a to the other hydraulic motor 22b. 38b. The circuit portion of each open hydraulic circuit 38a, 38b includes a hydraulic pressure at which the pressure oil of the operating hydraulic pump is stopped when a pair of hydraulic pumps are operated by operating one or the other engine. A check valve 40 is provided to prevent inflow into the pump. Reference numeral 42 denotes a switching valve provided in each open hydraulic circuit 38, which makes it possible to switch between neutral, forward and reverse of the hydraulic motor. In addition, as is well known, it is possible to run straight by tilting the left and right levers at the same angle, to steer by changing the angle of the left and right levers, and to operate skid steering by operating only one lever, Furthermore, it is clear that the left lever can be swung on the spot by tilting the left lever forward and the right lever backward.

  A hydraulic circuit device 30B shown in FIG. 6 includes a swash plate hydraulic pump 44 as a pair of hydraulic pumps driven by each engine 28, one swash plate hydraulic pump 44a drivingly associated with one engine 28a, and the other engine. Closed hydraulic circuit 46a hydraulically associated with one hydraulic motor 22a and one swash plate hydraulic pump drivably associated with one engine 28a. And a closed hydraulic circuit 46a hydraulically associated with the other hydraulic motor 22b, 44b and the other swash plate hydraulic pump 44b associated with the other engine 28b. In the case of using a swash plate hydraulic pump, when one or the other pair of swash plate hydraulic pumps is operated by operating one or the other engine, the pressure oil of the swash plate hydraulic pump that is operating is stopped. A check valve as in the hydraulic circuit device 30A is not required because the swash plate hydraulic pump is not hydraulically affected. The operation of the swash plate of the swash plate hydraulic pump can be switched between neutral, forward and backward movement of the hydraulic motor. That is, the traveling speed and the forward and backward movement can be switched by inclining the swash plate. Further, steering and skid steering traveling can be performed by changing the inclination of the swash plate of each pair of swash plate hydraulic pumps.

  When the vehicle travels on a forest road or road with a light load or an empty load, only one or the other engine is activated to operate a pair of hydraulic pumps 36 or swash plate hydraulic pumps 44 associated therewith. Then, the hydraulic pumps 32a and 32b or the swash plate hydraulic pumps 44a and 44b supply these hydraulic oils to the left and right hydraulic motors 22 through the two hydraulic circuits 34a, 34b or 46a, 46b, respectively. When the vehicle travels on a forest road, or when traveling on a forest road or a normal road in a loaded state, both engines 28 are activated to activate a pair of hydraulic pumps 32 or swash plate hydraulic pumps 44 associated therewith, respectively. To do. In the embodiment shown in FIG. 5, the pressure oil of one hydraulic pump 32a of one set of hydraulic pumps 32 and the pressure oil of the other hydraulic pump 32b of the other set of hydraulic pumps merge. Supplied to one hydraulic motor, the pressure oil of the other hydraulic pump 32b in one set of hydraulic pumps 32 and the pressure oil of one hydraulic pump 32a of the other set of hydraulic pumps merge. And supplied to the other hydraulic motor. Thus, in any case, the traveling device 18 can be driven in a desired direction by forward or reverse rotation of the hydraulic motor, or a combination thereof according to the switching position of the switching valve 42.

  In the embodiment shown in FIG. 6, the pressure oil of one swash plate hydraulic pump 44 a of one set of swash plate hydraulic pumps 44 and one swash plate hydraulic pressure of the other set of swash plate hydraulic pumps 32. The pressure oil of the pump 44a merges and is supplied to one hydraulic motor, and the pressure oil of the other swash plate hydraulic pump 44b of the one set of swash plate hydraulic pumps 44 and the other set of swash plate hydraulics. The pressure oil of the other swash plate hydraulic pump 44b in the pump 44 merges and is supplied to the other hydraulic motor. By operating the swash plate of the swash plate hydraulic pump, the traveling device 18 can be driven in a desired direction by forward or reverse rotation of the hydraulic motor, or a combination thereof, as in the previous embodiment.

  As described above, the transport work vehicle according to the present invention is equipped with at least two engines whose total output corresponds to the required load capacity, and in the case of empty traveling, only one of the engines is used. Therefore, the operation efficiency can be improved as compared with the case of using a large engine suitable for the required load capacity.

DESCRIPTION OF SYMBOLS 10A Wheel type transport work vehicle 10B Crawler type transport work vehicle 12 Driver's cab 14 Car body 16 Cargo load 18 Traveling device 20 Side support pole 22 Hydraulic motor 28 Engine 36 Hydraulic pump 38 Open hydraulic circuit 40 Check valve 42 Switching valve 44 Swash plate hydraulic pump 46 Closed hydraulic circuit

Claims (4)

  In a transport work vehicle including a vehicle with a cab, a loading platform provided on the vehicle body, a left and right traveling device mounted on the vehicle body, each driven by a hydraulic motor, including at least two engines mounted on the vehicle body, Alternatively, a transport work vehicle with a plurality of engines, wherein a hydraulic pump is operated by power of both engines and a hydraulic motor of a traveling device is driven by the pressure oil.   A pair of hydraulic pumps driven by the power of each engine and an open hydraulic circuit for supplying pressure oil from the hydraulic pumps to the left and right hydraulic motors drivingly associated with the traveling device, one pair of hydraulic pressures In order to supply the pressure oil of each of the pumps, or the pressure oil of each of the other pair of hydraulic pumps to this pressure oil and supply them to the left and right hydraulic motors through the open hydraulic circuit, One or both are activated, The multi-engine carrying work vehicle of Claim 1 characterized by the above-mentioned.   A pair of swash plate hydraulic pumps driven by the power of each engine and a closed hydraulic circuit for supplying pressure oil from the swash plate hydraulic pump to the left and right hydraulic motors drivingly associated with the traveling device, In order to supply the pressure oil of each of the pair of swash plate hydraulic pumps, or the pressure oil of each of the other pair of swash plate hydraulic pumps to this pressure oil and supply them to the left and right hydraulic motors through the closed hydraulic circuit, The transport work vehicle with a plurality of engines according to claim 1, wherein one or both of the two engines are activated.   The transport work vehicle according to any one of claims 1 to 3, wherein the travel device is a wheel travel device or a crawler travel device.

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