Multiple pump unit and vehicle with multiple pump unit

Abstract

A multiple pump unit is used for operating a plurality of actuators, and includes a plurality of pump shafts and a plurality of hydraulic pumps. The plurality of pump shafts is driven by an electric motor. The plurality of hydraulic pumps is driven by the plurality of pump shafts. Pressurized oil for operating the plurality of actuators is fed out from the plurality of hydraulic pumps.

1 . A multiple pump unit used for operating a plurality of actuators, comprising:
 a plurality of pump shafts driven by an electric motor; and   a plurality of hydraulic pumps driven by the respective plurality of pump shafts,   wherein pressurized oil for operating the plurality of actuators is fed out from the plurality of hydraulic pumps.   
   
   
       2 . The multiple pump unit according to  claim 1 ,
 wherein at least any one of the plurality of hydraulic pumps is a double port pump provided with a plurality of discharge ports in correspondence with one pump shaft, and   the pressurized oil for operating the plurality of actuators is fed out from the plurality of discharge ports of the double port pump.   
   
   
       3 . The multiple pump unit according to  claim 1 , further comprising:
 a casing housing the plurality of hydraulic pumps, and rotatably supporting a rotary shaft of the electric motor and the plurality of hydraulic pump shafts; and   a PTO shaft rotatably supported by the casing,   wherein the rotary shaft of the electric motor and the plurality of hydraulic pump shafts are operationally connected, and   power transmission is made selectively possible between the rotary shaft of the electric motor and the PTO shaft by a clutch mechanism.   
   
   
       4 . The multiple pump unit according to  claim 3 , further comprising:
 a PTO shaft side pulley fixed to the PTO shaft projecting from the casing.   
   
   
       5 . The multiple pump unit according to  claim 1 ,
 wherein a cooling fan is fixed to at least one of a rotary shaft of the electric motor or a hydraulic pump shaft among the plurality of hydraulic pumps.   
   
   
       6 . The multiple pump unit according to  claim 5 , further comprising:
 a casing housing the plurality of hydraulic pumps; and   a cooling air guide part fixed to an outer side of the casing and guiding cooling air generated by the cooling fan along the outer side of the casing.   
   
   
       7 . A vehicle with a multiple pump unit, comprising:
 the multiple pump unit according to  claim 1 ;   a secondary battery or a fuel cell supplying electric power to the electric motor; and   electric power supply state selecting unit selecting whether to supply electric power to the electric motor from the secondary battery or the fuel cell, or to shut off the supply of the electric power to the electric motor from the secondary battery or the fuel cell.   
   
   
       8 . The vehicle with the multiple pump unit according to  claim 7 , comprising:
 a working machine supported by a vehicle body; and   a working machine side pulley operationally connected to the working machine,   wherein the multiple pump unit is the multiple pump unit according to  claim 4 , and a belt is provided between the PTO shaft side pulley and the working machine side pulley.   
   
   
       9 . The vehicle with the multiple pump unit according to  claim 7 ,
 wherein the plurality of actuators driven by the pressurized oil from the multiple pump unit are two wheel-driving hydraulic motors.   
   
   
       10 . The vehicle with the multiple pump unit according to  claim 7 , further comprising:
 a generator driven by an engine,   wherein electric power generated by the generator is supplied to the electric motor via the secondary battery or directly.   
   
   
       11 . The vehicle with the multiple pump unit according to  claim 7 , further comprising:
 an engine side pulley capable of being selectively connected to an output shaft of an engine by a clutch;   a working machine supported by a vehicle body; and   a working machine side pulley operationally connected to the working machine,   wherein a belt is provided between the engine side pulley and the working machine side pulley.   
   
   
       12 . The vehicle with the multiple pump unit according to  claim 7 ,
 wherein a plurality of actuators driven by the pressurized oil from the multiple pump unit are each any of a working machine raising and lowering cylinder device raising and lowering a working machine, a working machine drive device driving the working machine, and a working machine tilting cylinder device tilting to displace the working machine, and   electric power is supplied to a wheel-driving electric motor from any of the secondary battery, the fuel cell and a generator to drive the wheel-driving electric motor.   
   
   
       13 . The vehicle with the multiple pump unit according to  claim 7 , further comprising:
 a charge pump provided to replenish at least any one of the plurality of hydraulic pumps with pressurized oil.