WO2017110525A1 - Mixer drum drive device - Google Patents

Mixer drum drive device Download PDF

Info

Publication number
WO2017110525A1
WO2017110525A1 PCT/JP2016/086726 JP2016086726W WO2017110525A1 WO 2017110525 A1 WO2017110525 A1 WO 2017110525A1 JP 2016086726 W JP2016086726 W JP 2016086726W WO 2017110525 A1 WO2017110525 A1 WO 2017110525A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixer drum
fluid pressure
valve
driving device
control valve
Prior art date
Application number
PCT/JP2016/086726
Other languages
French (fr)
Japanese (ja)
Inventor
阿部 真也
和巳 伊藤
Original Assignee
Kyb株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyb株式会社 filed Critical Kyb株式会社
Priority to CN201680075943.8A priority Critical patent/CN108430828B/en
Priority to NZ743898A priority patent/NZ743898A/en
Priority to AU2016378702A priority patent/AU2016378702B2/en
Publication of WO2017110525A1 publication Critical patent/WO2017110525A1/en

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60PVEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P3/00Vehicles adapted to transport, to carry or to comprise special loads or objects
    • B60P3/16Vehicles adapted to transport, to carry or to comprise special loads or objects for carrying mixed concrete, e.g. having rotatable drums
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member

Definitions

  • the present invention relates to a mixer drum driving device.
  • JP2012-91729A describes a drum rotating device that rotationally drives a drum that is rotatably mounted on a mixer vehicle.
  • a drum rotating apparatus described in JP2012-91729A is connected to a hydraulic pump driven by a traveling engine of a mixer vehicle, a hydraulic motor rotated by pressure oil sent from the hydraulic pump, and an output shaft of the hydraulic motor. And a drum.
  • the rotation direction of the hydraulic motor is switched in the forward direction or the reverse direction by switching the position of the switching valve by operating the switching lever.
  • JP2014-196094A describes a drive device that rotationally drives a mixer drum that is mounted on a vehicle and can be loaded with ready-mixed concrete.
  • JP2014-196094A includes a hydraulic pump that is driven by a traveling engine, a hydraulic motor that is driven by hydraulic oil discharged from the hydraulic pump to rotationally drive a mixer drum, and a switch that switches a rotational direction of the hydraulic motor. And a valve.
  • the drive device described in JP2014-196044A is configured to drive an auxiliary hydraulic pump by an electric motor using a battery as a driving source and to operate a hydraulic motor by hydraulic oil discharged from the auxiliary hydraulic pump when idling is stopped. ing.
  • the switching valve is maintained in the communication position during idling stop. For this reason, the hydraulic oil discharged from the auxiliary pump flows into the hydraulic pump through the switching valve, and the flow rate of the hydraulic oil discharged from the auxiliary pump may decrease. If the flow rate of the hydraulic oil discharged from the auxiliary pump in this way is reduced, the rotation of the mixer drum will be insufficient.
  • An object of the present invention is to provide a mixer drum driving device that can stably supply the working fluid discharged from the auxiliary fluid pressure pump to the mixer drum during idling stop.
  • FIG. 1 is a plan view of a mixer truck equipped with a mixer drum driving device according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram of the mixer drum driving device according to the embodiment of the present invention.
  • FIG. 3 is a hydraulic circuit diagram at the time of idling stop of the mixer drum driving device according to the embodiment of the present invention.
  • FIG. 4 is a hydraulic circuit diagram showing a modification of the mixer drum driving device according to the embodiment of the present invention.
  • FIG. 5 is a hydraulic circuit diagram showing a modification of the mixer drum driving device according to the embodiment of the present invention.
  • FIG. 6 is a hydraulic circuit diagram showing a modification of the mixer drum driving device according to the embodiment of the present invention.
  • the mixer vehicle 10 includes a traveling engine 3 of the vehicle 1, a mixer drum 2 mounted on the vehicle 1 and capable of loading ready-mixed concrete, and a mixer drum driving device 100 that rotationally drives the mixer drum 2.
  • the mixer truck 10 transports ready-mixed concrete loaded in the mixer drum 2.
  • the mixer drum 2 is a bottomed cylindrical container that is rotatably mounted on the vehicle 1.
  • the mixer drum 2 is mounted such that the rotating shaft faces the front-rear direction of the vehicle 1.
  • the mixer drum 2 is mounted so as to be inclined forward and backward so as to gradually increase toward the rear portion of the vehicle 1.
  • the mixer drum 2 has an opening at its rear end, and ready concrete can be charged and discharged from the opening.
  • the mixer drum 2 is supported on the vehicle 1 at three points, that is, a front portion to which the output shaft of the mixer drum driving device 100 is connected and a left and right portions of the rear portion.
  • the rear part of the mixer drum 2 is rotatably supported by rollers (not shown).
  • the mixer drum 2 is rotationally driven using the traveling engine 3 as a power source.
  • FIG. 2 is a diagram illustrating a hydraulic circuit of the mixer drum driving device 100.
  • the mixer drum driving device 100 is driven by the rotation of the traveling engine 3 and rotates the mixer drum 2 by the fluid pressure of the working fluid.
  • the rotational movement of the crankshaft in the traveling engine 3 is transmitted to the mixer drum driving apparatus 100 by a power take-off mechanism 4 (PTO: Power-take-off) for constantly taking out power from the traveling engine 3.
  • PTO Power-take-off
  • the mixer drum driving device 100 includes a hydraulic pump 5 as a fluid pressure pump driven by the traveling engine 3, and a hydraulic motor as a fluid pressure motor that is driven by hydraulic oil discharged from the hydraulic pump 5 to rotationally drive the mixer drum 2. 6, a control valve 8 that controls the flow of hydraulic oil from the hydraulic pump 5 to the hydraulic motor 6, a charge pump 9 that is driven by the traveling engine 3 and is provided coaxially with the hydraulic pump 5, and the hydraulic pump 5 and the control valve And a check valve 14 serving as a backflow prevention unit that prevents backflow of hydraulic oil from the control valve 8 toward the hydraulic pump 5.
  • the hydraulic pump 5 is rotationally driven by the power that is always extracted from the traveling engine 3 via the power extraction mechanism 4.
  • the hydraulic pump 5 is a swash plate type axial piston pump having a variable capacity.
  • the hydraulic motor 6 is a swash plate type axial piston motor with a fixed capacity.
  • the hydraulic motor 6 is rotationally driven in response to the supply of hydraulic oil discharged from the hydraulic pump 5.
  • the mixer drum 2 is connected to the hydraulic motor 6 via a speed reducer 7.
  • the hydraulic motor 6 is switched to normal rotation or reverse rotation by the control valve 8.
  • the hydraulic motor 6 is described as a swash plate type axial piston motor having a fixed capacity.
  • the hydraulic motor 6 is not limited to this, and the hydraulic motor 6 has a variable capacity. It may be.
  • a closed circuit 20 is provided between the hydraulic pump 5 and the hydraulic motor 6, and hydraulic oil circulates through the closed circuit 20.
  • the closed circuit 20 includes a return passage (pump suction passage) 21 that connects the suction port of the hydraulic pump 5 and the control valve 8, and a supply passage (pump discharge passage) that connects the discharge port of the hydraulic pump 5 and the control valve 8. 22, and first and second supply / discharge passages 23 and 24 that connect the control valve 8 and each of two ports provided in the hydraulic motor 6.
  • the control valve 8 directs the hydraulic oil discharged from the hydraulic pump 5 to the hydraulic motor 6 so as to rotate the mixer drum 2 in the forward direction and the hydraulic oil discharged from the hydraulic pump 5 to reversely rotate the mixer drum 2.
  • a reverse rotation position B leading to the hydraulic motor 6 and a blocking position C for blocking the flow of hydraulic oil from the hydraulic pump 5 to the hydraulic motor 6 are provided.
  • the control valve 8 is switched when the driver operates the operation lever 8a.
  • the charge pump 9 discharges hydraulic oil sucked from the tank T through the passage 25 to the charge passage 26. This hydraulic oil is charged into the return passage 21 from the charge passage 26 through the check valve 15.
  • the charge passage 26 communicates with the tank T through the relief valve 50.
  • the relief valve 50 is opened, and excess hydraulic oil discharged from the charge pump 9 is returned to the tank T.
  • the check valve 14 is provided in the supply passage 22 connecting the hydraulic pump 5 and the control valve 8 so as to prevent the backflow of hydraulic oil from the control valve 8 toward the discharge port side of the hydraulic pump 5.
  • the mixer drum driving apparatus 100 is a load sensing valve that adjusts so that a differential pressure between a load pressure generated in one of the first and second supply / discharge passages 23 and 24 and a pressure (pump discharge pressure) in the supply passage 22 becomes a predetermined value. 30 and a cutoff valve 40 that adjusts the pump discharge capacity of the hydraulic pump 5 in accordance with the pressure of the supply passage 22 (pump discharge pressure).
  • the load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pump discharge pressure in the supply passage 22 are guided to the load sensing valve 30 as pilot pressures.
  • the load sensing valve 30 adjusts the pilot pressure guided to the actuator 5a via the actuator passage 27 so that these differential pressures become a predetermined value.
  • the load sensing valve 30 includes a position F where the actuator 5a communicates with the tank T, and a position G where the actuator 5a communicates with the supply passage 22.
  • the load sensing valve 30 is constantly biased to the position F by the biasing force of the spring 34.
  • the load sensing valve 30 is connected to first and second pilot pressure passages 31 and 32.
  • the first pilot pressure passage 31 communicates with the high pressure side (load pressure side) of the first and second supply / discharge passages 23 and 24 via the high pressure selection valve 33.
  • the second pilot pressure passage 32 is connected to the supply passage 22.
  • the high pressure selection valve 33 for example, a shuttle valve is used.
  • the load pressure guided from the first pilot pressure passage 31 works in the direction of switching to the position F together with the urging force of the spring 34, and the pressure in the supply passage 22 led from the second pilot pressure passage 32 (pump discharge Pressure) acts in the direction of switching to the position G against the load pressure guided from the first pilot pressure passage 31 and the urging force of the spring 34.
  • the pressure in the supply passage 22 (pump discharge pressure) is guided to the cut-off valve 40 as a pilot pressure.
  • the cut-off valve 40 increases the pilot pressure guided to the actuator 5a when the pump discharge pressure rises above a predetermined value, thereby reducing the pump discharge capacity of the hydraulic pump 5.
  • the cut-off valve 40 includes a position H where the actuator 5a communicates with the tank T, and a position I where the actuator 5a communicates with the supply passage 22.
  • the pilot pressure passage 41 of the cutoff valve 40 is connected to the supply passage 22.
  • the cut-off valve 40 works in the direction in which the urging force of the spring 42 is switched to the position H, and the pilot pressure (pump discharge pressure) guided from the pilot pressure passage 41 is switched to the position I against the urging force of the spring 42. work.
  • the cut-off valve 40 When the mixer drum 2 is driven, the cut-off valve 40 is held at the position H when the pressure in the supply passage 22 (pump discharge pressure) is equal to or lower than a predetermined value, and the actuator passage 27 connecting the load sensing valve 30 and the actuator 5a is opened. . In this state, a load pressure generated in one of the first and second supply / discharge passages 51 and 52 and a pressure in the supply passage 22 (pump discharge pressure) are guided to the load sensing valve 30 as pilot pressures. . The load sensing valve 30 adjusts the pressure of the actuator passage 27 guided to the actuator 5a according to these differential pressures.
  • the pump discharge capacity of the hydraulic pump 5 has a predetermined differential pressure between the load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pressure of the supply passage 22 (pump discharge pressure) by the actuator 5a. Adjusted to a value.
  • the control valve 8 When the drive of the mixer drum 2 is stopped, the control valve 8 is switched to the cutoff position C, and the communication between the supply passage 22 and the first and second supply / discharge passages 23 and 24 is cut off. At this time, if the pump discharge pressure increases beyond a predetermined value, the pilot pressure (pump discharge pressure) guided from the pilot pressure passage 41 increases, so that the cutoff valve 40 is positioned against the biasing force of the spring 42. Switch from H to position I. As a result, the actuator 5a communicates with the supply passage 22, so that the pressure (pump discharge pressure) in the supply passage 22 is guided to the actuator 5a, and the pump discharge capacity of the hydraulic pump 5 is reduced.
  • the mixer drum driving device 100 includes an electric motor 11 driven by electric power stored in a battery (not shown), an auxiliary hydraulic pressure as an auxiliary fluid pressure pump that is driven by the rotation of the electric motor 11 to discharge hydraulic oil and operate the hydraulic motor 6.
  • the pump 12 further includes an opening / closing valve 13 provided in a discharge passage 29 that connects the second supply / discharge passage 24 and the tank T to open and close the discharge passage 29.
  • the output shaft of the electric motor 11 is connected to the rotary shaft of the auxiliary hydraulic pump 12.
  • the electric motor 11 is driven when the idling of the traveling engine 3 is stopped, that is, when idling is stopped, and drives the auxiliary hydraulic pump 12.
  • the auxiliary hydraulic pump 12 sucks the hydraulic oil stored in the tank T and discharges it to the auxiliary supply passage 28.
  • the hydraulic oil discharged to the auxiliary supply passage 28 is supplied to the first supply / discharge passage 23 through the check valve 16.
  • the hydraulic oil discharged from the auxiliary hydraulic pump 12 is supplied to the hydraulic motor 6 through the auxiliary supply passage 28 and the first supply / discharge passage 23 to cause the hydraulic motor 6 to rotate forward.
  • the electric motor 11 and the auxiliary hydraulic pump 12 are for rotating the mixer drum 2 so that the stirring of the ready-mixed concrete loaded on the mixer drum 2 does not stop when the traveling engine 3 stops idling.
  • the on-off valve 13 is an electromagnetic switching valve controlled by a controller (not shown).
  • the on-off valve 13 includes a position D that blocks communication between the second supply / discharge passage 24 and the tank T, and a position E that connects the second supply / discharge passage 24 and the tank T.
  • the on-off valve 13 is normally biased by a spring so as to maintain the D position.
  • the on-off valve 13 is switched to the E position by applying a current by the controller when idling is stopped.
  • the hydraulic pump 5 When the traveling engine 3 is driven, the hydraulic pump 5 is driven and hydraulic oil is discharged into the supply passage 22.
  • the driver operates the operation lever 8a to switch the control valve 8 from the shut-off position C to the normal rotation position A. Accordingly, the hydraulic oil discharged to the supply passage 22 is supplied to the hydraulic motor 6 through the check valve 14, the control valve 8, and the first supply / discharge passage 23, and the hydraulic motor 6 is rotated forward.
  • Rotation of the hydraulic motor 6 is transmitted to the mixer drum 2 via the speed reducer 7 to cause the mixer drum 2 to rotate forward. Thereby, the ready-mixed concrete in the mixer drum 2 is stirred.
  • the hydraulic oil discharged from the hydraulic motor 6 is returned to the suction port of the hydraulic pump 5 through the second supply / discharge passage 24, the control valve 8, and the return passage 21.
  • the mixer drum 2 is rotated forward by switching the control valve 8 to the forward rotation position A when the traveling engine 3 is driven. Thereby, the ready-mixed concrete is agitated in the mixer drum 2 and is prevented from being separated.
  • the hydraulic oil discharged to the supply passage 22 is supplied to the check valve 14 and the control valve. It is supplied to the hydraulic motor 6 through the valve 8 and the second supply / exhaust passage 24 to rotate the hydraulic motor 6 in the reverse direction.
  • the rotation of the hydraulic motor 6 is transmitted to the mixer drum 2 via the speed reducer 7 and rotates the mixer drum 2 in the reverse direction.
  • the hydraulic oil discharged from the hydraulic motor 6 is returned to the suction port of the hydraulic pump 5 through the first supply / discharge passage 23, the control valve 8, and the return passage 21.
  • the cut-off valve 40 When the mixer drum 2 (hydraulic motor 6) is driven to rotate and the pressure in the supply passage 22 (pump discharge pressure) is below a predetermined value, the cut-off valve 40 is held at the position H and connects the load sensing valve 30 and the actuator 5a.
  • the actuator passage 27 is opened.
  • the load sensing valve 30 is connected from the supply passage 22 to the actuator passage so that a differential pressure between the load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pressure of the supply passage 22 (pump discharge pressure) becomes a predetermined value.
  • the pressure guided to the actuator 5a via 27 is adjusted.
  • the pump discharge capacity of the hydraulic pump 5 has a predetermined differential pressure between the load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pressure of the supply passage 22 (pump discharge pressure) by the actuator 5a. Adjusted to a value.
  • the traveling engine 3 stops idling and enters an idling stop state.
  • the hydraulic pump 5 also stops rotating, so that the hydraulic motor 6 cannot be driven to rotate by the hydraulic pump 5.
  • the auxiliary hydraulic pump 12 is driven by the electric motor 11 using the battery as a power source, and the hydraulic oil is supplied to the first supply / discharge passage 23 through the auxiliary supply passage 28.
  • the hydraulic oil discharged from the auxiliary hydraulic pump 12 is supplied to the hydraulic motor 6 through the auxiliary supply passage 28 and the first supply / discharge passage 23 to rotate the hydraulic motor 6 in the normal direction.
  • the mixer drum driving device 100 includes a check valve 14 that prevents backflow of hydraulic oil from the control valve 8 toward the hydraulic pump 5. This prevents the hydraulic oil discharged from the auxiliary hydraulic pump 12 from flowing into the hydraulic pump 5 side when idling is stopped. Accordingly, since the hydraulic oil discharged from the auxiliary hydraulic pump 12 can be stably supplied to the mixer drum 2 during idling stop, it is possible to prevent the rotation of the mixer drum 2 from being insufficient.
  • the control valve 8 When the mixer drum driving device 100 does not include the check valve 14, the control valve 8 is switched from the normal rotation position A to the cutoff position C each time the idling stop state is switched, so that the auxiliary hydraulic pump 12 and the supply passage 22 communicate with each other. It is necessary to shut off.
  • the control valve 8 is a manual operation type, switching the control valve 8 to the cutoff position C every idling stop is a great burden on the driver.
  • the mixer drum driving device 100 includes the check valve 14, it is not necessary to switch the control valve 8 to the cutoff position C even when the mixer drum driving device 100 is switched to the idling stop state. That is, it is possible to prevent the hydraulic oil discharged from the auxiliary hydraulic pump 12 from flowing into the hydraulic pump 5 even when the control valve 8 is maintained at the normal rotation position A when idling is stopped. Therefore, the work of switching the control valve 8 can be made unnecessary.
  • the check valve 14 as a backflow prevention unit, it can be configured with a simple structure. Furthermore, since the check valve 14 does not need to be controlled, it is not necessary to provide a control signal or piping. Therefore, the mixer drum driving device 100 can be made a simple structure.
  • the control valve 8 is switched from the forward rotation position A to the cutoff position C when idling is stopped, the control valve 8 is moved from the cutoff position C to the forward rotation position A when the traveling engine 3 is driven again from the idling stop state. Therefore, there is a time lag when switching from driving by the auxiliary hydraulic pump 12 to driving by the hydraulic pump 5.
  • the control valve 8 is maintained at the normal rotation position A, and therefore it is not necessary to switch the control valve 8. Therefore, it is possible to smoothly switch from driving by the auxiliary hydraulic pump 12 to driving by the hydraulic pump 5. Thereby, since the supply of the hydraulic oil to the hydraulic motor 6 is not interrupted, the mixer drum 2 can be rotated stably.
  • the control valve 8 has been described as an example of a manual type as the switching means, but may be an electromagnetically operated type. Even in this case, since the control valve 8 may be maintained at the normal rotation position A when idling is stopped, control for switching the control valve 8 to the cutoff position C can be made unnecessary. Therefore, control can be simplified.
  • the check valve 14 is provided between the hydraulic pump 5 and the control valve 8. However, as shown in FIG. 4, the check valve 14 functions only when the control valve 8 is in the forward rotation position A. It may be provided inside. Thus, when the control valve 8 is in the forward rotation position A, the check valve 14 functions to prevent backflow of hydraulic oil from the control valve 8 toward the hydraulic pump 5, and the control valve 8 is in the reverse rotation position B. At times, the check valve 14 does not function. More specifically, the mixer drum 2 is not normally rotated reversely while the mixer vehicle 10 is traveling. That is, since the control valve 8 is not switched to the reverse rotation position B when idling is stopped (during traveling), it is not necessary to consider the backflow of hydraulic oil from the control valve 8 to the hydraulic pump 5 at the reverse rotation position B.
  • the check valve 14 is described as an example of the backflow prevention unit.
  • an electromagnetic switching valve 60 may be employed as the backflow prevention unit.
  • the on-off valve 13 and the electromagnetic switching valve 60 are controlled in synchronization to function in the same manner as when the check valve 14 is employed.
  • a pilot operated switching valve 160 may be employed as a backflow prevention unit.
  • a modification using the pilot operated switching valve 160 will be described.
  • a pilot operated switching valve 160 is provided in the supply passage 22 in place of the check valve 14, and an on-off valve 113 is provided in the discharge passage 29 in place of the on-off valve 13.
  • the pilot operated switching valve 160 includes a position J for opening the supply passage 22 and a position K for blocking the supply passage 22.
  • Pilot operated switching valve 160 is configured as a normally open type. Specifically, when the pilot pressure is not acting on the pilot chamber 160a, it is held at the position J by the biasing force of the spring 160b, and when the pilot pressure is acting on the pilot chamber 160a, it resists the biasing force of the spring 160b. Then, the valve body is moved and switched to the position K. Pilot pressure is supplied to the pilot chamber 160a through a pilot passage 161 branched from the upstream side of the check valve 16 in the auxiliary supply passage.
  • a pilot pressure discharge passage 162 that branches from the auxiliary supply passage 28 and communicates with the tank T is connected to the on-off valve 113.
  • the on-off valve 113 is an electromagnetic switching valve that is controlled in the same manner as the on-off valve 13 by a controller (not shown).
  • the on-off valve 113 shuts off the second supply / discharge passage 24 and the tank T and communicates the auxiliary supply passage 28 and the tank T with each other, and communicates the second supply / discharge passage 24 and the tank T with auxiliary supply.
  • the on-off valve 113 When the engine is driven, since no current is applied to the on-off valve 113, the on-off valve 113 is held at the D1 position by the biasing force of the spring. In this state, since the auxiliary hydraulic pump 12 is stopped, the hydraulic oil in the pilot chamber 160a is discharged to the tank T through the pilot passage 161, the pilot pressure discharge passage 162, and the on-off valve 113. Thereby, the pilot operated switching valve 160 is held at the position J, and the supply passage 22 is maintained in an opened state. On the other hand, when idling is stopped (when the engine is stopped), a current is applied to the on-off valve 113 by the controller, and the on-off valve 113 is switched to the E1 position.
  • the mixer drum driving device 100 is operated by a fluid pressure pump (hydraulic pump 5) driven by the engine (traveling engine 3) of the vehicle 1 and the working fluid discharged from the fluid pressure pump (hydraulic pump 5).
  • a backflow prevention unit for preventing the backflow of the working fluid from the control valve 8 toward the fluid pressure pump (hydraulic pump 5) is provided.
  • the working fluid discharged from the auxiliary fluid pressure pump (auxiliary hydraulic pump 12) is prevented from flowing into the fluid pressure pump (hydraulic pump 5) side. Thereby, it is possible to prevent the rotation of the mixer drum 2 from being insufficient.
  • the control valve 8 is a forward rotation position A that guides the working fluid discharged from the fluid pressure pump (hydraulic pump 5) to the fluid pressure motor (hydraulic motor 6) so as to rotate the mixer drum 2 in the forward direction. And a reverse rotation position B for guiding the working fluid discharged from the fluid pressure pump (hydraulic pump 5) to the fluid pressure motor (hydraulic motor 6) so as to reversely rotate the mixer drum 2, and fluid from the fluid pressure pump (hydraulic pump 5).
  • the control valve 8 is maintained at the forward rotation position A when idling is stopped.
  • the shutoff position C interrupts the flow of the working fluid to the pressure motor (hydraulic motor 6).
  • the backflow prevention unit is the check valve 14, and is provided between the fluid pressure pump (hydraulic pump 5) and the control valve 8.
  • the backflow prevention unit is provided in the control valve 8 so as to function only when the control valve 8 is in the forward rotation position A.
  • the backflow prevention unit is a switching valve (electromagnetic switching valve 60, pilot operated switching valve 160).
  • the switching valve (pilot operation type switching valve 160) is a pilot operation type switching valve (pilot operation type switching) that is switched by the pilot pressure supplied from the auxiliary fluid pressure pump (auxiliary hydraulic pump 12). Valve 160).
  • the hydraulic pump 5 is configured to be driven by the traveling engine 3, but the hydraulic pump 5 may be configured to be driven by an engine different from the traveling engine 3. Good.
  • the electromagnetic switching valve 60 and the pilot operated switching valve 160 may be provided between the confluence of the first supply / discharge passage 23 with the auxiliary supply passage 28 and the control valve 8. Further, the electromagnetic switching valve 60 and the pilot operated switching valve 160 are provided in the control valve 8 so as to function only when the control valve 8 is in the forward rotation position A, as in the modification shown in FIG. Also good.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)

Abstract

A mixer drum drive device (100) is provided with: a hydraulic pump (5) driven by a propulsion engine (3) of a vehicle (1); a hydraulic motor (6) that drives a mixer drum (2) to rotate through the action of a working fluid discharged from the hydraulic pump (5); a control valve (8) that controls the flow of the working fluid from the hydraulic pump (5) to the hydraulic motor (6); an electric motor (11) that rotates due to electrical power during idling stop of the propulsion engine (3); an auxiliary hydraulic pump (12) that is driven by the rotation of the electric motor (11) to discharge the working fluid and operate the hydraulic motor (6); and a check valve (14) that prevents backflow of the working fluid from the control valve (8) toward the hydraulic pump (5).

Description

ミキサドラム駆動装置Mixer drum drive device
 本発明は、ミキサドラム駆動装置に関するものである。 The present invention relates to a mixer drum driving device.
 JP2012-91729Aには、ミキサ車に回転自在に搭載されたドラムを回転駆動するドラム回転装置が記載されている。JP2012-91729Aに記載のドラム回転装置は、ミキサ車の走行用エンジンによって駆動される油圧ポンプと、当該油圧ポンプから送られる圧油によって回転される油圧モータと、油圧モータの出力軸に連結されたドラムと、を備えている。JP2012-91729Aに記載のドラム回転装置では、切換レバーの操作によって切換弁の位置が切り換えられることで、油圧モータが順方向、あるいは逆方向に回転方向が切り換わる。 JP2012-91729A describes a drum rotating device that rotationally drives a drum that is rotatably mounted on a mixer vehicle. A drum rotating apparatus described in JP2012-91729A is connected to a hydraulic pump driven by a traveling engine of a mixer vehicle, a hydraulic motor rotated by pressure oil sent from the hydraulic pump, and an output shaft of the hydraulic motor. And a drum. In the drum rotating device described in JP2012-91729A, the rotation direction of the hydraulic motor is switched in the forward direction or the reverse direction by switching the position of the switching valve by operating the switching lever.
 JP2014-196094Aには、車両に搭載され生コンクリートを積載可能なミキサドラムを回転駆動する駆動装置が記載されている。JP2014-196094Aに記載の駆動装置は、走行用エンジンによって駆動される油圧ポンプと、油圧ポンプから吐出された作動油によって作動してミキサドラムを回転駆動する油圧モータと、油圧モータの回転方向を切り換える切換弁と、を備えている。JP2014-196094Aに記載の駆動装置は、アイドリングストップ時には、バッテリを駆動源とする電動機によって補助油圧ポンプを駆動し、当該補助油圧ポンプから吐出された作動油によって、油圧モータを作動させるように構成されている。 JP2014-196094A describes a drive device that rotationally drives a mixer drum that is mounted on a vehicle and can be loaded with ready-mixed concrete. JP2014-196094A includes a hydraulic pump that is driven by a traveling engine, a hydraulic motor that is driven by hydraulic oil discharged from the hydraulic pump to rotationally drive a mixer drum, and a switch that switches a rotational direction of the hydraulic motor. And a valve. The drive device described in JP2014-196044A is configured to drive an auxiliary hydraulic pump by an electric motor using a battery as a driving source and to operate a hydraulic motor by hydraulic oil discharged from the auxiliary hydraulic pump when idling is stopped. ing.
 一般的に、ミキサ車では、生コンクリートの分離を防止するために、走行中、ミキサドラムを回転させている。また、近年では、アイドリングストップ機能を備えたミキサ車が求められている。 Generally, in a mixer truck, the mixer drum is rotated during traveling in order to prevent separation of ready-mixed concrete. In recent years, there has been a demand for a mixer vehicle having an idling stop function.
 JP2012-91729Aに記載のミキサ駆動装置をそのままアイドリングストップ機能を備えたミキサ車に適用すると、アイドリングストップ時には走行用エンジンが停止してしまうため、走行用エンジンによって駆動される油圧ポンプも停止してしまう。このため、JP2012-91729Aに記載のミキサ駆動装置では、アイドリングストップ時に油圧ポンプによってミキサドラムを回転させることができない。 When the mixer driving device described in JP2012-91729A is applied to a mixer vehicle having an idling stop function as it is, the traveling engine stops when idling stops, and the hydraulic pump driven by the traveling engine also stops. . For this reason, in the mixer driving device described in JP2012-91729A, the mixer drum cannot be rotated by the hydraulic pump when idling is stopped.
 そこで、JP2014-196094Aに記載された駆動装置のように、バッテリを動力源とする電動機によって駆動される補助油圧ポンプを設けて、この補助油圧ポンプによって油圧モータを回転させることが考えられる。 Therefore, it is conceivable to provide an auxiliary hydraulic pump that is driven by an electric motor that uses a battery as a power source, as in the drive device described in JP2014-196094A, and to rotate the hydraulic motor by this auxiliary hydraulic pump.
 しかしながら、JP2014-196094Aに記載のミキサ駆動装置では、アイドリングストップ中、切換弁が連通位置に維持される。このため、補助ポンプから吐出された作動油が、切換弁を通じて油圧ポンプに流れ込んでしまい、補助ポンプから吐出された作動油の流量が減少してしまうおそれがあった。このようにして補助ポンプから吐出された作動油が流量が減少してしまうと、ミキサドラムの回転が不足してしまう。 However, in the mixer driving device described in JP2014-196094A, the switching valve is maintained in the communication position during idling stop. For this reason, the hydraulic oil discharged from the auxiliary pump flows into the hydraulic pump through the switching valve, and the flow rate of the hydraulic oil discharged from the auxiliary pump may decrease. If the flow rate of the hydraulic oil discharged from the auxiliary pump in this way is reduced, the rotation of the mixer drum will be insufficient.
 本発明は、アイドリングストップ中、補助流体圧ポンプから吐出された作動流体を安定してミキサドラムに供給できるミキサドラム駆動装置を提供することを目的とする。 An object of the present invention is to provide a mixer drum driving device that can stably supply the working fluid discharged from the auxiliary fluid pressure pump to the mixer drum during idling stop.
 本発明のある態様によれば、車両に搭載され生コンクリートを積載可能なミキサドラムを回転駆動するミキサドラム駆動装置は、車両のエンジンによって駆動される流体圧ポンプと、流体圧ポンプから吐出された作動流体によって作動してミキサドラムを回転駆動する流体圧モータと、流体圧ポンプから流体圧モータへの作動流体の流れを制御する制御弁と、エンジンのアイドリングストップ時に電力によって回転する電動機と、電動機の回転によって駆動されて作動流体を吐出し、流体圧モータを作動させる補助流体圧ポンプと、制御弁から流体圧ポンプへ向かう作動流体の逆流を防止する逆流防止部と、を備える。 According to an aspect of the present invention, a mixer drum driving device that rotationally drives a mixer drum mounted on a vehicle and capable of loading ready-mixed concrete includes a fluid pressure pump that is driven by the engine of the vehicle, and a working fluid that is discharged from the fluid pressure pump A fluid pressure motor that operates to rotate the mixer drum, a control valve that controls the flow of the working fluid from the fluid pressure pump to the fluid pressure motor, an electric motor that rotates by electric power when the engine is idling stopped, and an electric motor that rotates An auxiliary fluid pressure pump that is driven to discharge the working fluid and activate the fluid pressure motor, and a backflow prevention unit that prevents backflow of the working fluid from the control valve toward the fluid pressure pump.
図1は、本発明の実施形態に係るミキサドラム駆動装置を搭載したミキサ車の平面図である。FIG. 1 is a plan view of a mixer truck equipped with a mixer drum driving device according to an embodiment of the present invention. 図2は、本発明の実施形態に係るミキサドラム駆動装置の油圧回路図である。FIG. 2 is a hydraulic circuit diagram of the mixer drum driving device according to the embodiment of the present invention. 図3は、本発明の実施形態に係るミキサドラム駆動装置のアイドリングストップ時における油圧回路図である。FIG. 3 is a hydraulic circuit diagram at the time of idling stop of the mixer drum driving device according to the embodiment of the present invention. 図4は、本発明の実施形態に係るミキサドラム駆動装置の変形例を示す油圧回路図である。FIG. 4 is a hydraulic circuit diagram showing a modification of the mixer drum driving device according to the embodiment of the present invention. 図5は、本発明の実施形態に係るミキサドラム駆動装置の変形例を示す油圧回路図である。FIG. 5 is a hydraulic circuit diagram showing a modification of the mixer drum driving device according to the embodiment of the present invention. 図6は、本発明の実施形態に係るミキサドラム駆動装置の変形例を示す油圧回路図である。FIG. 6 is a hydraulic circuit diagram showing a modification of the mixer drum driving device according to the embodiment of the present invention.
 以下、図面を参照して、本発明の実施形態に係るミキサドラム駆動装置100について説明する。 Hereinafter, a mixer drum driving apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.
 まず、図1を参照して、ミキサドラム駆動装置100が搭載されるミキサ車10の全体構成について説明する。 First, with reference to FIG. 1, the overall configuration of the mixer truck 10 on which the mixer drum driving device 100 is mounted will be described.
 ミキサ車10は、車両1の走行用エンジン3と、車両1に搭載され生コンクリートを積載可能なミキサドラム2と、ミキサドラム2を回転駆動するミキサドラム駆動装置100と、を備える。ミキサ車10は、ミキサドラム2内に積載された生コンクリートを運搬するものである。 The mixer vehicle 10 includes a traveling engine 3 of the vehicle 1, a mixer drum 2 mounted on the vehicle 1 and capable of loading ready-mixed concrete, and a mixer drum driving device 100 that rotationally drives the mixer drum 2. The mixer truck 10 transports ready-mixed concrete loaded in the mixer drum 2.
 ミキサドラム2は、車両1に回転可能に搭載される有底円筒形の容器である。ミキサドラム2は、回転軸が車両1の前後方向を向くように搭載される。ミキサドラム2は、車両1の後部に向かって徐々に高くなるように、前後に傾斜して搭載される。ミキサドラム2は、その後端に開口部が形成され、開口部から生コンクリートの投入及び排出が可能になっている。 The mixer drum 2 is a bottomed cylindrical container that is rotatably mounted on the vehicle 1. The mixer drum 2 is mounted such that the rotating shaft faces the front-rear direction of the vehicle 1. The mixer drum 2 is mounted so as to be inclined forward and backward so as to gradually increase toward the rear portion of the vehicle 1. The mixer drum 2 has an opening at its rear end, and ready concrete can be charged and discharged from the opening.
 ミキサドラム2は、ミキサドラム駆動装置100の出力軸が連結される前部と、後部の左右との三点で車両1上に支持される。ミキサドラム2の後部は、ローラ(図示省略)によって回転自在に支持される。ミキサドラム2は、走行用エンジン3を動力源として回転駆動される。 The mixer drum 2 is supported on the vehicle 1 at three points, that is, a front portion to which the output shaft of the mixer drum driving device 100 is connected and a left and right portions of the rear portion. The rear part of the mixer drum 2 is rotatably supported by rollers (not shown). The mixer drum 2 is rotationally driven using the traveling engine 3 as a power source.
 次に、図2及び図3を参照して、ミキサドラム駆動装置100について説明する。図2は、ミキサドラム駆動装置100の油圧回路を示す図である。 Next, the mixer drum driving device 100 will be described with reference to FIGS. FIG. 2 is a diagram illustrating a hydraulic circuit of the mixer drum driving device 100.
 ミキサドラム駆動装置100は、走行用エンジン3の回転によって駆動され、作動流体の流体圧によってミキサドラム2を回転駆動するものである。走行用エンジン3におけるクランクシャフトの回転運動は、走行用エンジン3から動力を常時取り出すための動力取り出し機構4(PTO:Power-take-off)によってミキサドラム駆動装置100に伝達される。 The mixer drum driving device 100 is driven by the rotation of the traveling engine 3 and rotates the mixer drum 2 by the fluid pressure of the working fluid. The rotational movement of the crankshaft in the traveling engine 3 is transmitted to the mixer drum driving apparatus 100 by a power take-off mechanism 4 (PTO: Power-take-off) for constantly taking out power from the traveling engine 3.
 ミキサドラム駆動装置100では、作動流体として作動油が用いられる。作動油に代えて、他の非圧縮性流体を作動流体として用いてもよい。ミキサドラム駆動装置100は、走行用エンジン3によって駆動される流体圧ポンプとしての油圧ポンプ5と、油圧ポンプ5から吐出された作動油によって作動してミキサドラム2を回転駆動する流体圧モータとしての油圧モータ6と、油圧ポンプ5から油圧モータ6への作動油の流れを制御する制御弁8と、走行用エンジン3によって駆動され油圧ポンプ5と同軸に設けられるチャージポンプ9と、油圧ポンプ5と制御弁8との間の通路に設けられ、制御弁8から油圧ポンプ5へ向かう作動油の逆流を防止する逆流防止部としてのチェック弁14と、を備える。 In the mixer drum driving apparatus 100, hydraulic oil is used as the working fluid. Other incompressible fluids may be used as the working fluid instead of the working oil. The mixer drum driving device 100 includes a hydraulic pump 5 as a fluid pressure pump driven by the traveling engine 3, and a hydraulic motor as a fluid pressure motor that is driven by hydraulic oil discharged from the hydraulic pump 5 to rotationally drive the mixer drum 2. 6, a control valve 8 that controls the flow of hydraulic oil from the hydraulic pump 5 to the hydraulic motor 6, a charge pump 9 that is driven by the traveling engine 3 and is provided coaxially with the hydraulic pump 5, and the hydraulic pump 5 and the control valve And a check valve 14 serving as a backflow prevention unit that prevents backflow of hydraulic oil from the control valve 8 toward the hydraulic pump 5.
 油圧ポンプ5は、動力取り出し機構4を介して走行用エンジン3から常時取り出される動力によって回転駆動される。油圧ポンプ5は、容量が可変な斜板型アキシャルピストンポンプである。 The hydraulic pump 5 is rotationally driven by the power that is always extracted from the traveling engine 3 via the power extraction mechanism 4. The hydraulic pump 5 is a swash plate type axial piston pump having a variable capacity.
 油圧モータ6は、容量が固定の斜板型アキシャルピストンモータである。油圧モータ6は、油圧ポンプ5から吐出された作動油の供給を受けて回転駆動される。油圧モータ6には、減速機7を介してミキサドラム2が連結される。油圧モータ6は、制御弁8によって正回転あるいは逆回転に切り換えられる。油圧モータ6によってミキサドラム2が正回転される場合には、ミキサドラム2内の生コンクリートが攪拌される。一方、油圧モータ6によってミキサドラム2が逆回転される場合には、ミキサドラム2内の生コンクリートが後端の開口部から外部へと排出される。なお、本実施形態では、油圧モータ6は、その容量が固定である斜板型アキシャルピストンモータとして説明したが、これに限らず、油圧モータ6はその容量が可変である斜板型アキシャルピストンモータであってもよい。 The hydraulic motor 6 is a swash plate type axial piston motor with a fixed capacity. The hydraulic motor 6 is rotationally driven in response to the supply of hydraulic oil discharged from the hydraulic pump 5. The mixer drum 2 is connected to the hydraulic motor 6 via a speed reducer 7. The hydraulic motor 6 is switched to normal rotation or reverse rotation by the control valve 8. When the mixer drum 2 is rotated forward by the hydraulic motor 6, the ready-mixed concrete in the mixer drum 2 is agitated. On the other hand, when the mixer drum 2 is rotated reversely by the hydraulic motor 6, the ready-mixed concrete in the mixer drum 2 is discharged to the outside from the opening at the rear end. In the present embodiment, the hydraulic motor 6 is described as a swash plate type axial piston motor having a fixed capacity. However, the hydraulic motor 6 is not limited to this, and the hydraulic motor 6 has a variable capacity. It may be.
 油圧ポンプ5と油圧モータ6の間には、閉回路20が設けられ、この閉回路20を作動油が循環するようになっている。閉回路20は、油圧ポンプ5の吸込ポートと制御弁8とを接続する戻し通路(ポンプ吸込通路)21と、油圧ポンプ5の吐出ポートと制御弁8とを接続する供給通路(ポンプ吐出通路)22と、制御弁8と油圧モータ6に設けられる二つのポートのそれぞれとを接続する第1、第2給排通路23、24と、によって構成される。 A closed circuit 20 is provided between the hydraulic pump 5 and the hydraulic motor 6, and hydraulic oil circulates through the closed circuit 20. The closed circuit 20 includes a return passage (pump suction passage) 21 that connects the suction port of the hydraulic pump 5 and the control valve 8, and a supply passage (pump discharge passage) that connects the discharge port of the hydraulic pump 5 and the control valve 8. 22, and first and second supply / discharge passages 23 and 24 that connect the control valve 8 and each of two ports provided in the hydraulic motor 6.
 制御弁8は、油圧ポンプ5が吐出した作動油をミキサドラム2を正回転させるように油圧モータ6に導く正転位置Aと、油圧ポンプ5が吐出した作動油をミキサドラム2を逆回転させるように油圧モータ6に導く逆転位置Bと、油圧ポンプ5から油圧モータ6への間の作動油の流れを遮断する遮断位置Cと、を備える。制御弁8は、運転者が操作レバー8aを操作することによって切り換えられる。 The control valve 8 directs the hydraulic oil discharged from the hydraulic pump 5 to the hydraulic motor 6 so as to rotate the mixer drum 2 in the forward direction and the hydraulic oil discharged from the hydraulic pump 5 to reversely rotate the mixer drum 2. A reverse rotation position B leading to the hydraulic motor 6 and a blocking position C for blocking the flow of hydraulic oil from the hydraulic pump 5 to the hydraulic motor 6 are provided. The control valve 8 is switched when the driver operates the operation lever 8a.
 チャージポンプ9は、タンクTから通路25を通じて吸込んだ作動油をチャージ通路26に吐出する。この作動油は、チャージ通路26からチェック弁15を介して戻し通路21に充填される。 The charge pump 9 discharges hydraulic oil sucked from the tank T through the passage 25 to the charge passage 26. This hydraulic oil is charged into the return passage 21 from the charge passage 26 through the check valve 15.
 チャージ通路26は、リリーフ弁50を通じてタンクTに連通する。チャージ通路26の圧力が所定値を超えて上昇すると、リリーフ弁50が開弁し、チャージポンプ9から吐出される余剰作動油はタンクTに戻される。 The charge passage 26 communicates with the tank T through the relief valve 50. When the pressure in the charge passage 26 rises above a predetermined value, the relief valve 50 is opened, and excess hydraulic oil discharged from the charge pump 9 is returned to the tank T.
 チェック弁14は、油圧ポンプ5と制御弁8とを接続する供給通路22に、制御弁8から油圧ポンプ5の吐出ポート側へ向かう作動油の逆流を防止するように設けられる。 The check valve 14 is provided in the supply passage 22 connecting the hydraulic pump 5 and the control valve 8 so as to prevent the backflow of hydraulic oil from the control valve 8 toward the discharge port side of the hydraulic pump 5.
 ミキサドラム駆動装置100は、第1、第2給排通路23、24の一方に生じる負荷圧と供給通路22の圧力(ポンプ吐出圧)との差圧が所定値になるように調整するロードセンシング弁30と、供給通路22の圧力(ポンプ吐出圧)に応じて油圧ポンプ5のポンプ吐出容量を調整するするカットオフ弁40と、をさらに備える。 The mixer drum driving apparatus 100 is a load sensing valve that adjusts so that a differential pressure between a load pressure generated in one of the first and second supply / discharge passages 23 and 24 and a pressure (pump discharge pressure) in the supply passage 22 becomes a predetermined value. 30 and a cutoff valve 40 that adjusts the pump discharge capacity of the hydraulic pump 5 in accordance with the pressure of the supply passage 22 (pump discharge pressure).
 ロードセンシング弁30には、パイロット圧として第1、第2給排通路23、24の一方に生じる負荷圧と供給通路22のポンプ吐出圧とが互いに対抗するように導かれる。ロードセンシング弁30は、これらの差圧が所定値になるようにアクチュエータ通路27を介してアクチュエータ5aに導かれるパイロット圧を調節する。 The load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pump discharge pressure in the supply passage 22 are guided to the load sensing valve 30 as pilot pressures. The load sensing valve 30 adjusts the pilot pressure guided to the actuator 5a via the actuator passage 27 so that these differential pressures become a predetermined value.
 ロードセンシング弁30は、アクチュエータ5aをタンクTに連通する位置Fと、アクチュエータ5aを供給通路22に連通する位置Gと、を備える。ロードセンシング弁30は、スプリング34の付勢力によって位置Fに常時付勢される。 The load sensing valve 30 includes a position F where the actuator 5a communicates with the tank T, and a position G where the actuator 5a communicates with the supply passage 22. The load sensing valve 30 is constantly biased to the position F by the biasing force of the spring 34.
 ロードセンシング弁30には、第1、第2パイロット圧通路31、32が接続される。第1パイロット圧通路31は、高圧選択弁33を介して第1、第2給排通路23、24の高圧側(負荷圧側)に連通する。第2パイロット圧通路32は、供給通路22に接続される。高圧選択弁33は、例えばシャトル弁が用いられる。 The load sensing valve 30 is connected to first and second pilot pressure passages 31 and 32. The first pilot pressure passage 31 communicates with the high pressure side (load pressure side) of the first and second supply / discharge passages 23 and 24 via the high pressure selection valve 33. The second pilot pressure passage 32 is connected to the supply passage 22. As the high pressure selection valve 33, for example, a shuttle valve is used.
 ロードセンシング弁30では、第1パイロット圧通路31から導かれる負荷圧が、スプリング34の付勢力と共に位置Fに切換える方向に働き、第2パイロット圧通路32から導かれる供給通路22の圧力(ポンプ吐出圧)が、第1パイロット圧通路31から導かれる負荷圧とスプリング34の付勢力とに抗して位置Gに切換える方向に働く。 In the load sensing valve 30, the load pressure guided from the first pilot pressure passage 31 works in the direction of switching to the position F together with the urging force of the spring 34, and the pressure in the supply passage 22 led from the second pilot pressure passage 32 (pump discharge Pressure) acts in the direction of switching to the position G against the load pressure guided from the first pilot pressure passage 31 and the urging force of the spring 34.
 カットオフ弁40には、パイロット圧として供給通路22の圧力(ポンプ吐出圧)が導かれる。カットオフ弁40は、ポンプ吐出圧が所定値を超えて上昇するとアクチュエータ5aに導かれるパイロット圧を高めて油圧ポンプ5のポンプ吐出容量を小さくする。 The pressure in the supply passage 22 (pump discharge pressure) is guided to the cut-off valve 40 as a pilot pressure. The cut-off valve 40 increases the pilot pressure guided to the actuator 5a when the pump discharge pressure rises above a predetermined value, thereby reducing the pump discharge capacity of the hydraulic pump 5.
 カットオフ弁40は、アクチュエータ5aをタンクTに連通する位置Hと、アクチュエータ5aを供給通路22に連通する位置Iと、を備える。 The cut-off valve 40 includes a position H where the actuator 5a communicates with the tank T, and a position I where the actuator 5a communicates with the supply passage 22.
 カットオフ弁40のパイロット圧通路41は、供給通路22に接続される。カットオフ弁40は、スプリング42の付勢力が位置Hに切換える方向に働き、パイロット圧通路41から導かれるパイロット圧(ポンプ吐出圧)がスプリング42の付勢力に抗して位置Iに切換える方向に働く。 The pilot pressure passage 41 of the cutoff valve 40 is connected to the supply passage 22. The cut-off valve 40 works in the direction in which the urging force of the spring 42 is switched to the position H, and the pilot pressure (pump discharge pressure) guided from the pilot pressure passage 41 is switched to the position I against the urging force of the spring 42. work.
 ミキサドラム2の駆動時、供給通路22の圧力(ポンプ吐出圧)が所定値以下の状況ではカットオフ弁40が位置Hに保持され、ロードセンシング弁30とアクチュエータ5aとを結ぶアクチュエータ通路27を開通させる。この状態で、ロードセンシング弁30には、パイロット圧として第一、第二給排通路51,52の一方に生じる負荷圧と供給通路22の圧力(ポンプ吐出圧)が互いに対抗するように導かれる。ロードセンシング弁30は、これらの差圧に応じて、アクチュエータ5aに導かれるアクチュエータ通路27の圧力を調節する。これにより、油圧ポンプ5のポンプ吐出容量が、アクチュエータ5aによって、第1、第2給排通路23、24の一方に生じる負荷圧と供給通路22の圧力(ポンプ吐出圧)との差圧が所定値になるように調整される。 When the mixer drum 2 is driven, the cut-off valve 40 is held at the position H when the pressure in the supply passage 22 (pump discharge pressure) is equal to or lower than a predetermined value, and the actuator passage 27 connecting the load sensing valve 30 and the actuator 5a is opened. . In this state, a load pressure generated in one of the first and second supply / discharge passages 51 and 52 and a pressure in the supply passage 22 (pump discharge pressure) are guided to the load sensing valve 30 as pilot pressures. . The load sensing valve 30 adjusts the pressure of the actuator passage 27 guided to the actuator 5a according to these differential pressures. As a result, the pump discharge capacity of the hydraulic pump 5 has a predetermined differential pressure between the load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pressure of the supply passage 22 (pump discharge pressure) by the actuator 5a. Adjusted to a value.
 ミキサドラム2の駆動を停止する時には、制御弁8が遮断位置Cに切換えられ、供給通路22と第1、第2給排通路23、24との連通が遮断される。このとき、ポンプ吐出圧が所定値を超えて上昇すると、パイロット圧通路41から導かれるパイロット圧(ポンプ吐出圧)が上昇するので、カットオフ弁40は、スプリング42の付勢力に抗して位置Hから位置Iに切り換わる。これにより、アクチュエータ5aは、供給通路22に連通するので、供給通路22の圧力(ポンプ吐出圧)がアクチュエータ5aに導かれ、油圧ポンプ5のポンプ吐出容量は小さくなる。 When the drive of the mixer drum 2 is stopped, the control valve 8 is switched to the cutoff position C, and the communication between the supply passage 22 and the first and second supply / discharge passages 23 and 24 is cut off. At this time, if the pump discharge pressure increases beyond a predetermined value, the pilot pressure (pump discharge pressure) guided from the pilot pressure passage 41 increases, so that the cutoff valve 40 is positioned against the biasing force of the spring 42. Switch from H to position I. As a result, the actuator 5a communicates with the supply passage 22, so that the pressure (pump discharge pressure) in the supply passage 22 is guided to the actuator 5a, and the pump discharge capacity of the hydraulic pump 5 is reduced.
 ミキサドラム駆動装置100は、図示しないバッテリに蓄電された電力によって駆動される電動機11と、電動機11の回転によって駆動されて作動油を吐出し、油圧モータ6を作動させる補助流体圧ポンプとしての補助油圧ポンプ12と、第2給排通路24とタンクTとを接続する排出通路29に設けられ排出通路29を開閉する開閉弁13と、をさらに備える。 The mixer drum driving device 100 includes an electric motor 11 driven by electric power stored in a battery (not shown), an auxiliary hydraulic pressure as an auxiliary fluid pressure pump that is driven by the rotation of the electric motor 11 to discharge hydraulic oil and operate the hydraulic motor 6. The pump 12 further includes an opening / closing valve 13 provided in a discharge passage 29 that connects the second supply / discharge passage 24 and the tank T to open and close the discharge passage 29.
 電動機11の出力軸は、補助油圧ポンプ12の回転軸に連結される。電動機11は、走行用エンジン3のアイドリングが停止した状態、つまり、アイドリングストップ時に駆動し、補助油圧ポンプ12を駆動する。 The output shaft of the electric motor 11 is connected to the rotary shaft of the auxiliary hydraulic pump 12. The electric motor 11 is driven when the idling of the traveling engine 3 is stopped, that is, when idling is stopped, and drives the auxiliary hydraulic pump 12.
 補助油圧ポンプ12は、タンクTに溜められた作動油を吸い込んで補助供給通路28に吐出する。補助供給通路28に吐出された作動油は、チェック弁16を通って第1給排通路23に供給される。これにより、補助油圧ポンプ12から吐出された作動油は、補助供給通路28及び第1給排通路23を通じて油圧モータ6に供給され、油圧モータ6を正回転させる。 The auxiliary hydraulic pump 12 sucks the hydraulic oil stored in the tank T and discharges it to the auxiliary supply passage 28. The hydraulic oil discharged to the auxiliary supply passage 28 is supplied to the first supply / discharge passage 23 through the check valve 16. As a result, the hydraulic oil discharged from the auxiliary hydraulic pump 12 is supplied to the hydraulic motor 6 through the auxiliary supply passage 28 and the first supply / discharge passage 23 to cause the hydraulic motor 6 to rotate forward.
 電動機11及び補助油圧ポンプ12は、走行用エンジン3がアイドリングストップ時に、ミキサドラム2に積載された生コンクリートの撹拌が停止しないようにミキサドラム2を回転駆動するものためのものである。 The electric motor 11 and the auxiliary hydraulic pump 12 are for rotating the mixer drum 2 so that the stirring of the ready-mixed concrete loaded on the mixer drum 2 does not stop when the traveling engine 3 stops idling.
 開閉弁13は、図示しないコントローラによって制御される電磁式切換弁である。開閉弁13は、第2給排通路24とタンクTとの連通を遮断する位置Dと、第2給排通路24とタンクTとを連通する位置Eと、を備える。開閉弁13は、通常時は、D位置を保持するようにスプリングによって付勢される。開閉弁13は、アイドリングストップ時には、コントローラによって電流が印加されE位置に切り換えられる。 The on-off valve 13 is an electromagnetic switching valve controlled by a controller (not shown). The on-off valve 13 includes a position D that blocks communication between the second supply / discharge passage 24 and the tank T, and a position E that connects the second supply / discharge passage 24 and the tank T. The on-off valve 13 is normally biased by a spring so as to maintain the D position. The on-off valve 13 is switched to the E position by applying a current by the controller when idling is stopped.
 以上のように構成されたミキサドラム駆動装置100の動作について説明する。 The operation of the mixer drum driving apparatus 100 configured as described above will be described.
 走行用エンジン3が駆動すると、油圧ポンプ5が駆動され、供給通路22に作動油が吐出される。生コンクリートの運搬中は、運転者は操作レバー8aを操作して制御弁8を遮断位置Cから正転位置Aに切り換える。これにより、供給通路22に吐出された作動油は、チェック弁14、制御弁8、及び第1給排通路23を通じて油圧モータ6に供給され、油圧モータ6を正回転させる。 When the traveling engine 3 is driven, the hydraulic pump 5 is driven and hydraulic oil is discharged into the supply passage 22. During transportation of the ready-mixed concrete, the driver operates the operation lever 8a to switch the control valve 8 from the shut-off position C to the normal rotation position A. Accordingly, the hydraulic oil discharged to the supply passage 22 is supplied to the hydraulic motor 6 through the check valve 14, the control valve 8, and the first supply / discharge passage 23, and the hydraulic motor 6 is rotated forward.
 油圧モータ6の回転は、減速機7を介してミキサドラム2に伝達され、ミキサドラム2を正回転させる。これにより、ミキサドラム2内の生コンクリートは撹拌される。油圧モータ6から排出された作動油は、第2給排通路24、制御弁8、及び戻し通路21を通って、油圧ポンプ5の吸込ポートに戻される。 Rotation of the hydraulic motor 6 is transmitted to the mixer drum 2 via the speed reducer 7 to cause the mixer drum 2 to rotate forward. Thereby, the ready-mixed concrete in the mixer drum 2 is stirred. The hydraulic oil discharged from the hydraulic motor 6 is returned to the suction port of the hydraulic pump 5 through the second supply / discharge passage 24, the control valve 8, and the return passage 21.
 このように、走行用エンジン3が駆動しているときに、制御弁8を正転位置Aに切り換えることによって、ミキサドラム2が正回転される。これにより、生コンクリートはミキサドラム2内で撹拌され、分離することが防止される。 Thus, the mixer drum 2 is rotated forward by switching the control valve 8 to the forward rotation position A when the traveling engine 3 is driven. Thereby, the ready-mixed concrete is agitated in the mixer drum 2 and is prevented from being separated.
 走行用エンジン3が駆動中に、運転者が操作レバー8aを操作して制御弁8を遮断位置Cから逆転位置Bに切り換えると、供給通路22に吐出された作動油は、チェック弁14、制御弁8、及び第2給排通路24を通じて油圧モータ6に供給され、油圧モータ6を逆回転させる。油圧モータ6の回転は、減速機7を介してミキサドラム2に伝達され、ミキサドラム2を逆回転させる。これにより、ミキサドラム2内の生コンクリートは後端の開口部から外部へと排出される。油圧モータ6から排出された作動油は、第1給排通路23、制御弁8、戻し通路21を通って、油圧ポンプ5の吸込ポートに戻される。 When the driver operates the operation lever 8a and switches the control valve 8 from the shut-off position C to the reverse rotation position B while the traveling engine 3 is being driven, the hydraulic oil discharged to the supply passage 22 is supplied to the check valve 14 and the control valve. It is supplied to the hydraulic motor 6 through the valve 8 and the second supply / exhaust passage 24 to rotate the hydraulic motor 6 in the reverse direction. The rotation of the hydraulic motor 6 is transmitted to the mixer drum 2 via the speed reducer 7 and rotates the mixer drum 2 in the reverse direction. Thereby, the ready-mixed concrete in the mixer drum 2 is discharged | emitted from the opening part of a rear end to the exterior. The hydraulic oil discharged from the hydraulic motor 6 is returned to the suction port of the hydraulic pump 5 through the first supply / discharge passage 23, the control valve 8, and the return passage 21.
 ミキサドラム2(油圧モータ6)の回転駆動時、供給通路22の圧力(ポンプ吐出圧)が所定値以下の状態では、カットオフ弁40は位置Hに保持され、ロードセンシング弁30とアクチュエータ5aを結ぶアクチュエータ通路27を開通する。ロードセンシング弁30は、第1、第2給排通路23、24の一方に生じる負荷圧と供給通路22の圧力(ポンプ吐出圧)の差圧が所定値になるように供給通路22からアクチュエータ通路27を経由してアクチュエータ5aに導かれる圧力を調節する。これにより、油圧ポンプ5のポンプ吐出容量が、アクチュエータ5aによって、第1、第2給排通路23、24の一方に生じる負荷圧と供給通路22の圧力(ポンプ吐出圧)との差圧が所定値になるように調整される。 When the mixer drum 2 (hydraulic motor 6) is driven to rotate and the pressure in the supply passage 22 (pump discharge pressure) is below a predetermined value, the cut-off valve 40 is held at the position H and connects the load sensing valve 30 and the actuator 5a. The actuator passage 27 is opened. The load sensing valve 30 is connected from the supply passage 22 to the actuator passage so that a differential pressure between the load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pressure of the supply passage 22 (pump discharge pressure) becomes a predetermined value. The pressure guided to the actuator 5a via 27 is adjusted. As a result, the pump discharge capacity of the hydraulic pump 5 has a predetermined differential pressure between the load pressure generated in one of the first and second supply / discharge passages 23 and 24 and the pressure of the supply passage 22 (pump discharge pressure) by the actuator 5a. Adjusted to a value.
 ミキサ車10が走行中に信号などによって停止すると、走行用エンジン3は、アイドリングが停止され、アイドリングストップ状態になる。このようにして、走行用エンジン3が停止すると、油圧ポンプ5も回転を停止するため、油圧ポンプ5によって油圧モータ6を回転駆動することができなくなる。このとき、バッテリを動力源とする電動機11によって補助油圧ポンプ12が駆動され、補助供給通路28を通じて第1給排通路23に作動油が供給される。これにより、補助油圧ポンプ12から吐出された作動油は、補助供給通路28、第1給排通路23を通って油圧モータ6に供給され、油圧モータ6を正回転させる。これと同時に開閉弁13には、図示しないコントローラから電流が印加され、開閉弁13は位置Eに切り換えられる(図3参照)。これにより、油圧モータ6から排出された作動油は、第2給排通路24、排出通路29、及び開閉弁13を通ってタンクTに戻される。 When the mixer vehicle 10 stops due to a signal or the like while traveling, the traveling engine 3 stops idling and enters an idling stop state. In this way, when the traveling engine 3 stops, the hydraulic pump 5 also stops rotating, so that the hydraulic motor 6 cannot be driven to rotate by the hydraulic pump 5. At this time, the auxiliary hydraulic pump 12 is driven by the electric motor 11 using the battery as a power source, and the hydraulic oil is supplied to the first supply / discharge passage 23 through the auxiliary supply passage 28. As a result, the hydraulic oil discharged from the auxiliary hydraulic pump 12 is supplied to the hydraulic motor 6 through the auxiliary supply passage 28 and the first supply / discharge passage 23 to rotate the hydraulic motor 6 in the normal direction. At the same time, a current is applied to the on-off valve 13 from a controller (not shown), and the on-off valve 13 is switched to the position E (see FIG. 3). As a result, the hydraulic oil discharged from the hydraulic motor 6 is returned to the tank T through the second supply / discharge passage 24, the discharge passage 29, and the on-off valve 13.
 このとき、図3に示すように、制御弁8は正転位置Aに維持されているため、補助油圧ポンプ12から吐出された作動油は、図3の矢印に示すように、制御弁8を通って供給通路22に流れ込んでしまう。しかしながら、供給通路22にはチェック弁14が設けられているので、補助油圧ポンプ12から吐出された作動油が油圧ポンプ5に流れ込むことは阻止される。したがって、補助油圧ポンプ12から吐出された作動油が油圧ポンプ5に流れ込むことによって、補助油圧ポンプ12から吐出された作動油の流量が減少することを防止できるので、アイドリングストップ中にミキサドラム2の回転が不足することを防止できる。 At this time, as shown in FIG. 3, since the control valve 8 is maintained in the forward rotation position A, the hydraulic oil discharged from the auxiliary hydraulic pump 12 causes the control valve 8 to move as shown by the arrow in FIG. It flows into the supply passage 22 through. However, since the check valve 14 is provided in the supply passage 22, the hydraulic oil discharged from the auxiliary hydraulic pump 12 is prevented from flowing into the hydraulic pump 5. Therefore, it is possible to prevent the hydraulic oil discharged from the auxiliary hydraulic pump 12 from flowing into the hydraulic pump 5, and thus the flow rate of the hydraulic oil discharged from the auxiliary hydraulic pump 12 can be prevented. Therefore, the rotation of the mixer drum 2 during the idling stop can be prevented. Can be prevented.
 運転者がアクセルペダルを踏むなどして、アイドリングストップ状態が解除されると、走行用エンジン3は再び駆動する。これにより、油圧ポンプ5は回転駆動され、供給通路22に作動油を吐出する。これと同時に、電動機11は停止され、コントローラから開閉弁13への電流の印加が停止される。電動機11が停止されることで、補助油圧ポンプ12から補助供給通路28への作動油の供給が停止する。また、コントローラから電流の印加が停止されることで、開閉弁13は位置Dに切り換えられるので、第2給排通路24とタンクTとの連通が遮断される。 When the idling stop state is released, for example, when the driver depresses the accelerator pedal, the traveling engine 3 is driven again. As a result, the hydraulic pump 5 is rotationally driven and discharges hydraulic oil to the supply passage 22. At the same time, the electric motor 11 is stopped and application of current from the controller to the on-off valve 13 is stopped. When the electric motor 11 is stopped, the supply of hydraulic oil from the auxiliary hydraulic pump 12 to the auxiliary supply passage 28 is stopped. Further, when the application of current from the controller is stopped, the on-off valve 13 is switched to the position D, so that the communication between the second supply / discharge passage 24 and the tank T is interrupted.
 このようにして、油圧モータ6は、再び油圧ポンプ5から吐出された作動油によって、回転駆動される。 In this way, the hydraulic motor 6 is rotationally driven by the hydraulic oil discharged from the hydraulic pump 5 again.
 以上のミキサドラム駆動装置100によれば、以下に示す効果を奏する。 According to the above mixer drum driving device 100, the following effects are obtained.
 ミキサドラム駆動装置100は、制御弁8から油圧ポンプ5へ向かう作動油の逆流を防止するチェック弁14を備える。これにより、アイドリングストップ時に、補助油圧ポンプ12から吐出された作動油が油圧ポンプ5側へ流れ込むことが防止される。したがって、アイドリングストップ中に、補助油圧ポンプ12から吐出された作動油を安定してミキサドラム2に供給できるので、ミキサドラム2の回転が不足することを防止できる。 The mixer drum driving device 100 includes a check valve 14 that prevents backflow of hydraulic oil from the control valve 8 toward the hydraulic pump 5. This prevents the hydraulic oil discharged from the auxiliary hydraulic pump 12 from flowing into the hydraulic pump 5 side when idling is stopped. Accordingly, since the hydraulic oil discharged from the auxiliary hydraulic pump 12 can be stably supplied to the mixer drum 2 during idling stop, it is possible to prevent the rotation of the mixer drum 2 from being insufficient.
 ミキサドラム駆動装置100がチェック弁14を備えていない場合には、アイドリングストップ状態に切り換わる毎に制御弁8を正転位置Aから遮断位置Cに切り換えて補助油圧ポンプ12と供給通路22との連通を遮断する必要がある。特に制御弁8が手動操作形式である場合には、アイドリングストップ毎に制御弁8を遮断位置Cに切り換えることは、運転者にとって多大な負担となる。 When the mixer drum driving device 100 does not include the check valve 14, the control valve 8 is switched from the normal rotation position A to the cutoff position C each time the idling stop state is switched, so that the auxiliary hydraulic pump 12 and the supply passage 22 communicate with each other. It is necessary to shut off. In particular, when the control valve 8 is a manual operation type, switching the control valve 8 to the cutoff position C every idling stop is a great burden on the driver.
 ミキサドラム駆動装置100は、チェック弁14を備えるので、アイドリングストップ状態に切り換わっても、制御弁8を遮断位置Cに切り換える必要がない。つまり、アイドリングストップ時に、制御弁8が正転位置Aに維持されていても、補助油圧ポンプ12から吐出された作動油が油圧ポンプ5に流れ込むことを防止できる。したがって、制御弁8を切り換える作業を不要とすることができる。 Since the mixer drum driving device 100 includes the check valve 14, it is not necessary to switch the control valve 8 to the cutoff position C even when the mixer drum driving device 100 is switched to the idling stop state. That is, it is possible to prevent the hydraulic oil discharged from the auxiliary hydraulic pump 12 from flowing into the hydraulic pump 5 even when the control valve 8 is maintained at the normal rotation position A when idling is stopped. Therefore, the work of switching the control valve 8 can be made unnecessary.
 また、逆流防止部としてチェック弁14を採用することにより、簡単な構造で構成することができる。さらに、チェック弁14は制御する必要がないので、制御のための信号や配管を設ける必要がない。したがって、ミキサドラム駆動装置100を簡単な構造とすることができる。 Further, by adopting the check valve 14 as a backflow prevention unit, it can be configured with a simple structure. Furthermore, since the check valve 14 does not need to be controlled, it is not necessary to provide a control signal or piping. Therefore, the mixer drum driving device 100 can be made a simple structure.
 アイドリングストップ時に、制御弁8を正転位置Aから遮断位置Cに切り換える構成であると、走行用エンジン3がアイドリングストップ状態から再び駆動したときに、制御弁8を遮断位置Cから正転位置Aに切り換える必要があるため、補助油圧ポンプ12による駆動から油圧ポンプ5による駆動に切り換わるときにタイムラグが生じてしまう。しかしながら、ミキサドラム駆動装置100では、走行用エンジン3がアイドリングストップ状態から再び駆動したとき、制御弁8が正転位置Aに維持されているので、制御弁8を切り換える必要がない。したがって、補助油圧ポンプ12による駆動から油圧ポンプ5による駆動にスムーズに切り換えることができる。これにより、油圧モータ6への作動油の供給が途切れることがないので、ミキサドラム2を安定して回転させることができる。 If the control valve 8 is switched from the forward rotation position A to the cutoff position C when idling is stopped, the control valve 8 is moved from the cutoff position C to the forward rotation position A when the traveling engine 3 is driven again from the idling stop state. Therefore, there is a time lag when switching from driving by the auxiliary hydraulic pump 12 to driving by the hydraulic pump 5. However, in the mixer drum driving apparatus 100, when the traveling engine 3 is driven again from the idling stop state, the control valve 8 is maintained at the normal rotation position A, and therefore it is not necessary to switch the control valve 8. Therefore, it is possible to smoothly switch from driving by the auxiliary hydraulic pump 12 to driving by the hydraulic pump 5. Thereby, since the supply of the hydraulic oil to the hydraulic motor 6 is not interrupted, the mixer drum 2 can be rotated stably.
 制御弁8は、切換手段として手動式のものを例に説明したが、電磁操作式のものであってもよい。この場合であっても、アイドリングストップ時に制御弁8を正転位置Aに維持したままでよいので、制御弁8を遮断位置Cに切り換える制御を不要とすることができる。したがって、制御を簡略化することができる。 The control valve 8 has been described as an example of a manual type as the switching means, but may be an electromagnetically operated type. Even in this case, since the control valve 8 may be maintained at the normal rotation position A when idling is stopped, control for switching the control valve 8 to the cutoff position C can be made unnecessary. Therefore, control can be simplified.
 また、チェック弁14は、油圧ポンプ5と制御弁8との間に設けられているが、図4に示すように、制御弁8が正転位置Aにある時のみ機能するように制御弁8内に設けられていてもよい。これにより、制御弁8が正転位置Aにある時は、チェック弁14は制御弁8から油圧ポンプ5へ向かう作動油の逆流を防止するように機能し、制御弁8が逆転位置Bにある時は、チェック弁14は機能しない。具体的に説明すると、通常、ミキサ車10の走行中はミキサドラム2を逆回転させることはない。つまり、アイドリングストップ時(走行中)に制御弁8が逆転位置Bに切り換えられていることはないため、逆転位置Bにおいて制御弁8から油圧ポンプ5へ向かう作動油の逆流を考慮しなくても影響はない。また、ミキサ車10の停止中などに、ミキサドラム2を逆回転させる時(制御弁8が逆転位置Bにある時)は、油圧ポンプ5から吐出された作動油はチェック弁14による圧力損失の影響を受けることなく油圧モータ6に供給される。したがって、このような構成を採用することにより、ミキサドラム2を逆回転させる時にチェック弁14の圧力損失の影響を受けることがないので、油圧ポンプ5の効率を向上させ、省エネルギー化を図ることができる。 The check valve 14 is provided between the hydraulic pump 5 and the control valve 8. However, as shown in FIG. 4, the check valve 14 functions only when the control valve 8 is in the forward rotation position A. It may be provided inside. Thus, when the control valve 8 is in the forward rotation position A, the check valve 14 functions to prevent backflow of hydraulic oil from the control valve 8 toward the hydraulic pump 5, and the control valve 8 is in the reverse rotation position B. At times, the check valve 14 does not function. More specifically, the mixer drum 2 is not normally rotated reversely while the mixer vehicle 10 is traveling. That is, since the control valve 8 is not switched to the reverse rotation position B when idling is stopped (during traveling), it is not necessary to consider the backflow of hydraulic oil from the control valve 8 to the hydraulic pump 5 at the reverse rotation position B. There is no effect. Further, when the mixer drum 2 is rotated reversely (for example, when the control valve 8 is in the reverse rotation position B) while the mixer vehicle 10 is stopped, the hydraulic oil discharged from the hydraulic pump 5 is affected by the pressure loss caused by the check valve 14. It is supplied to the hydraulic motor 6 without receiving. Therefore, by adopting such a configuration, when the mixer drum 2 is rotated in the reverse direction, it is not affected by the pressure loss of the check valve 14, so that the efficiency of the hydraulic pump 5 can be improved and energy saving can be achieved. .
 なお、上記実施形態では、逆流防止部としてチェック弁14を例に説明したが、図5に示すように、逆流防止部として電磁切換弁60を採用してもよい。この場合には、開閉弁13と電磁切換弁60を同期させて制御することで、チェック弁14を採用した場合と同様に機能する。 In the above embodiment, the check valve 14 is described as an example of the backflow prevention unit. However, as shown in FIG. 5, an electromagnetic switching valve 60 may be employed as the backflow prevention unit. In this case, the on-off valve 13 and the electromagnetic switching valve 60 are controlled in synchronization to function in the same manner as when the check valve 14 is employed.
 さらに、図6に示すように、逆流防止部としてパイロット操作式切換弁160を採用してもよい。以下に、パイロット操作式切換弁160を用いた変形例について説明する。 Furthermore, as shown in FIG. 6, a pilot operated switching valve 160 may be employed as a backflow prevention unit. Hereinafter, a modification using the pilot operated switching valve 160 will be described.
 この変形例では、供給通路22にチェック弁14に代えてパイロット操作式切換弁160が設けられ、排出通路29に開閉弁13に代えて開閉弁113が設けられる。 In this modification, a pilot operated switching valve 160 is provided in the supply passage 22 in place of the check valve 14, and an on-off valve 113 is provided in the discharge passage 29 in place of the on-off valve 13.
 パイロット操作式切換弁160は、供給通路22を開放する位置Jと、供給通路22を遮断する位置Kと、を備える。パイロット操作式切換弁160は、ノーマルオープンタイプとして構成される。具体的には、パイロット圧がパイロット室160aに作用していない状態では、ばね160bの付勢力によって位置Jに保持され、パイロット圧がパイロット室160aに作用した状態では、ばね160bの付勢力に抗して弁体を移動させ位置Kに切り換えられる。パイロット室160aには、補助供給通路28におけるチェック弁16の上流側から分岐したパイロット通路161を通じてパイロット圧が供給される。 The pilot operated switching valve 160 includes a position J for opening the supply passage 22 and a position K for blocking the supply passage 22. Pilot operated switching valve 160 is configured as a normally open type. Specifically, when the pilot pressure is not acting on the pilot chamber 160a, it is held at the position J by the biasing force of the spring 160b, and when the pilot pressure is acting on the pilot chamber 160a, it resists the biasing force of the spring 160b. Then, the valve body is moved and switched to the position K. Pilot pressure is supplied to the pilot chamber 160a through a pilot passage 161 branched from the upstream side of the check valve 16 in the auxiliary supply passage.
 開閉弁113には、補助供給通路28から分岐しタンクTに連通するパイロット圧排出通路162が接続される。開閉弁113は、図示しないコントローラによって開閉弁13と同様に制御される電磁式切換弁である。開閉弁113は、第2給排通路24とタンクTとを遮断するとともに補助供給通路28とタンクTとを連通する位置D1と、第2給排通路24とタンクTとを連通するとともに補助供給通路28とタンクTとを遮断する位置E1と、を備える。 A pilot pressure discharge passage 162 that branches from the auxiliary supply passage 28 and communicates with the tank T is connected to the on-off valve 113. The on-off valve 113 is an electromagnetic switching valve that is controlled in the same manner as the on-off valve 13 by a controller (not shown). The on-off valve 113 shuts off the second supply / discharge passage 24 and the tank T and communicates the auxiliary supply passage 28 and the tank T with each other, and communicates the second supply / discharge passage 24 and the tank T with auxiliary supply. A position E1 that blocks the passage 28 and the tank T.
 エンジン駆動時には、開閉弁113には電流が印加されていないため、開閉弁113はスプリングの付勢力によってD1位置に保持される。この状態では、補助油圧ポンプ12が停止しているため、パイロット室160aの作動油は、パイロット通路161、パイロット圧排出通路162、及び開閉弁113を通じてタンクTに排出される。これにより、パイロット操作式切換弁160が位置Jに保持され、供給通路22は開放された状態に維持される。これに対して、アイドリングストップ時(エンジン停止時)には、開閉弁113にはコントローラによって電流が印加され、開閉弁113はE1位置に切り換えられる。この状態では、補助油圧ポンプ12が駆動しているため、補助油圧ポンプ12から吐出された作動油が、パイロット通路161を通じてパイロット室160aに供給される。これにより、パイロット操作式切換弁160が位置Kに切り換えられ、供給通路22は遮断された状態になる。このようにパイロット操作式切換弁160が制御されることにより、パイロット操作式切換弁160はチェック弁14と同様に機能し、アイドリングストップ時に補助油圧ポンプ12から吐出された作動油が油圧ポンプ5側へ流れ込むことを防止できる。 When the engine is driven, since no current is applied to the on-off valve 113, the on-off valve 113 is held at the D1 position by the biasing force of the spring. In this state, since the auxiliary hydraulic pump 12 is stopped, the hydraulic oil in the pilot chamber 160a is discharged to the tank T through the pilot passage 161, the pilot pressure discharge passage 162, and the on-off valve 113. Thereby, the pilot operated switching valve 160 is held at the position J, and the supply passage 22 is maintained in an opened state. On the other hand, when idling is stopped (when the engine is stopped), a current is applied to the on-off valve 113 by the controller, and the on-off valve 113 is switched to the E1 position. In this state, since the auxiliary hydraulic pump 12 is driven, the hydraulic oil discharged from the auxiliary hydraulic pump 12 is supplied to the pilot chamber 160a through the pilot passage 161. As a result, the pilot operated switching valve 160 is switched to the position K, and the supply passage 22 is shut off. By controlling the pilot operated switching valve 160 in this way, the pilot operated switching valve 160 functions in the same manner as the check valve 14, and the hydraulic oil discharged from the auxiliary hydraulic pump 12 when idling stops is on the hydraulic pump 5 side. Can be prevented from flowing into.
 以上のように構成された本発明の実施形態の構成、作用、及び効果をまとめて説明する。 The configuration, operation, and effect of the embodiment of the present invention configured as described above will be described together.
 ミキサドラム駆動装置100は、車両1のエンジン(走行用エンジン3)によって駆動される流体圧ポンプ(油圧ポンプ5)と、流体圧ポンプ(油圧ポンプ5)から吐出された作動流体によって作動してミキサドラム2を回転駆動する流体圧モータ(油圧モータ6)と、流体圧ポンプ(油圧ポンプ5)から流体圧モータ(油圧モータ6)への作動流体の流れを制御する制御弁8と、エンジン(走行用エンジン3)のアイドリングストップ時に電力によって回転する電動機11と、電動機11の回転によって駆動されて作動流体を吐出し、流体圧モータ(油圧モータ6)を作動させる補助流体圧ポンプ(補助油圧ポンプ12)と、制御弁8から流体圧ポンプ(油圧ポンプ5)へ向かう作動流体の逆流を防止する逆流防止部(チェック弁14、電磁切換弁60、パイロット操作式切換弁160)と、を備える。 The mixer drum driving device 100 is operated by a fluid pressure pump (hydraulic pump 5) driven by the engine (traveling engine 3) of the vehicle 1 and the working fluid discharged from the fluid pressure pump (hydraulic pump 5). A hydraulic pressure motor (hydraulic motor 6) for rotating the motor, a control valve 8 for controlling the flow of the working fluid from the fluid pressure pump (hydraulic pump 5) to the fluid pressure motor (hydraulic motor 6), and an engine (traveling engine) 3) an electric motor 11 that is rotated by electric power when idling is stopped, and an auxiliary fluid pressure pump (auxiliary hydraulic pump 12) that is driven by the rotation of the electric motor 11 to discharge the working fluid and operate the fluid pressure motor (hydraulic motor 6). , A backflow prevention unit (check valve 14, which prevents backflow of the working fluid from the control valve 8 toward the fluid pressure pump (hydraulic pump 5). Comprising 磁切 valve 60, a pilot-operated switching valve 160), the.
 この構成では、制御弁8から流体圧ポンプ(油圧ポンプ5)へ向かう作動流体の逆流を防止する逆流防止部(チェック弁14、電磁切換弁60、パイロット操作式切換弁160)が設けられるので、補助流体圧ポンプ(補助油圧ポンプ12)から吐出された作動流体が流体圧ポンプ(油圧ポンプ5)側へ流れ込むことが防止される。これにより、ミキサドラム2の回転が不足することを防止できる。 In this configuration, a backflow prevention unit (check valve 14, electromagnetic switching valve 60, pilot operated switching valve 160) for preventing the backflow of the working fluid from the control valve 8 toward the fluid pressure pump (hydraulic pump 5) is provided. The working fluid discharged from the auxiliary fluid pressure pump (auxiliary hydraulic pump 12) is prevented from flowing into the fluid pressure pump (hydraulic pump 5) side. Thereby, it is possible to prevent the rotation of the mixer drum 2 from being insufficient.
 また、ミキサドラム駆動装置100では、制御弁8は、流体圧ポンプ(油圧ポンプ5)から吐出された作動流体をミキサドラム2を正回転させるように流体圧モータ(油圧モータ6)に導く正転位置Aと、流体圧ポンプ(油圧ポンプ5)から吐出された作動流体をミキサドラム2を逆回転させるように流体圧モータ(油圧モータ6)に導く逆転位置Bと、流体圧ポンプ(油圧ポンプ5)から流体圧モータ(油圧モータ6)への間の作動流体の流れを遮断する遮断位置Cと、を有し、制御弁8は、アイドリングストップ時に正転位置Aに維持される。 In the mixer drum driving apparatus 100, the control valve 8 is a forward rotation position A that guides the working fluid discharged from the fluid pressure pump (hydraulic pump 5) to the fluid pressure motor (hydraulic motor 6) so as to rotate the mixer drum 2 in the forward direction. And a reverse rotation position B for guiding the working fluid discharged from the fluid pressure pump (hydraulic pump 5) to the fluid pressure motor (hydraulic motor 6) so as to reversely rotate the mixer drum 2, and fluid from the fluid pressure pump (hydraulic pump 5). The control valve 8 is maintained at the forward rotation position A when idling is stopped. The shutoff position C interrupts the flow of the working fluid to the pressure motor (hydraulic motor 6).
 この構成では、エンジン(走行用エンジン3)がアイドリングストップ状態から再び駆動したときには、制御弁8が正転位置Aに維持されているので、補助流体圧ポンプ(補助油圧ポンプ12)による駆動から流体圧ポンプ(油圧ポンプ5)による駆動にスムーズに切り換わることができる。これにより、流体圧モータ(油圧モータ6)への作動流体の供給が途切れることがないので、ミキサドラム2を安定して回転させることができる。 In this configuration, when the engine (traveling engine 3) is driven again from the idling stop state, the control valve 8 is maintained at the normal rotation position A, so that the fluid from the drive by the auxiliary fluid pressure pump (auxiliary hydraulic pump 12) is reduced. It is possible to smoothly switch to driving by the pressure pump (hydraulic pump 5). Thereby, since supply of the working fluid to the fluid pressure motor (hydraulic motor 6) is not interrupted, the mixer drum 2 can be stably rotated.
 また、ミキサドラム駆動装置100では、逆流防止部は、チェック弁14であって、流体圧ポンプ(油圧ポンプ5)と制御弁8との間に設けられる。 Further, in the mixer drum driving apparatus 100, the backflow prevention unit is the check valve 14, and is provided between the fluid pressure pump (hydraulic pump 5) and the control valve 8.
 この構成では、逆流防止部をチェック弁14で構成することにより、簡単な構造とすることができる。また、逆流防止部を制御する必要がないので、ミキサドラム駆動装置100の制御を簡略化することができる。 In this configuration, a simple structure can be achieved by configuring the backflow prevention unit with the check valve 14. In addition, since it is not necessary to control the backflow prevention unit, the control of the mixer drum driving device 100 can be simplified.
 また、ミキサドラム駆動装置100では、逆流防止部は、チェック弁14であって、制御弁8が正転位置Aにある時のみ機能するように制御弁8に設けられる。 Further, in the mixer drum driving apparatus 100, the backflow prevention unit is provided in the control valve 8 so as to function only when the control valve 8 is in the forward rotation position A.
 この構成では、逆流防止部をチェック弁14で構成することにより、簡単な構造とすることができる。さらに、チェック弁14は、制御弁8が正転位置Aにある時のみ機能するため、逆転位置Bではチェック弁14による圧力損失の影響を受けることが無い。これにより、流体圧ポンプ(油圧ポンプ5)の効率を向上させ、省エネルギー化を図ることができる。 In this configuration, a simple structure can be achieved by configuring the backflow prevention unit with the check valve 14. Further, since the check valve 14 functions only when the control valve 8 is in the forward rotation position A, the check valve 14 is not affected by the pressure loss due to the check valve 14 in the reverse rotation position B. Thereby, the efficiency of the fluid pressure pump (hydraulic pump 5) can be improved and energy saving can be achieved.
 また、ミキサドラム駆動装置100では、逆流防止部は、切換弁(電磁切換弁60、パイロット操作式切換弁160)である。 Further, in the mixer drum driving apparatus 100, the backflow prevention unit is a switching valve (electromagnetic switching valve 60, pilot operated switching valve 160).
 また、ミキサドラム駆動装置100では、切換弁(パイロット操作式切換弁160)は、補助流体圧ポンプ(補助油圧ポンプ12)から供給されるパイロット圧によって切り換えられるパイロット操作式の切換弁(パイロット操作式切換弁160)である。 In the mixer drum driving apparatus 100, the switching valve (pilot operation type switching valve 160) is a pilot operation type switching valve (pilot operation type switching) that is switched by the pilot pressure supplied from the auxiliary fluid pressure pump (auxiliary hydraulic pump 12). Valve 160).
 以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。 The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.
 上記実施形態では、油圧ポンプ5は、走行用エンジン3によって駆動されるように構成されているが、油圧ポンプ5は、走行用エンジン3とは別のエンジンによって駆動されるように構成してもよい。 In the above embodiment, the hydraulic pump 5 is configured to be driven by the traveling engine 3, but the hydraulic pump 5 may be configured to be driven by an engine different from the traveling engine 3. Good.
 電磁切換弁60及びパイロット操作式切換弁160は、第1給排通路23における補助供給通路28との合流点と制御弁8との間に設けられていてもよい。また、電磁切換弁60及びパイロット操作式切換弁160は、図4に示す変形例と同様に、制御弁8が正転位置Aにある時のみ機能するように制御弁8内に設けられていてもよい。 The electromagnetic switching valve 60 and the pilot operated switching valve 160 may be provided between the confluence of the first supply / discharge passage 23 with the auxiliary supply passage 28 and the control valve 8. Further, the electromagnetic switching valve 60 and the pilot operated switching valve 160 are provided in the control valve 8 so as to function only when the control valve 8 is in the forward rotation position A, as in the modification shown in FIG. Also good.
 本願は、2015年12月24日に日本国特許庁に出願された特願2015-251674号に基づく優先権を主張し、この出願の全ての内容は参照により本明細書に組み込まれる。 This application claims priority based on Japanese Patent Application No. 2015-251654 filed with the Japan Patent Office on December 24, 2015, the entire contents of which are hereby incorporated by reference.

Claims (6)

  1.  車両に搭載され生コンクリートを積載可能なミキサドラムを回転駆動するミキサドラム駆動装置であって、
     前記車両のエンジンによって駆動される流体圧ポンプと、
     前記流体圧ポンプから吐出された作動流体によって作動して前記ミキサドラムを回転駆動する流体圧モータと、
     前記流体圧ポンプから前記流体圧モータへの作動流体の流れを制御する制御弁と、
     前記エンジンのアイドリングストップ時に電力によって回転する電動機と、
     前記電動機の回転によって駆動されて作動流体を吐出し、前記流体圧モータを作動させる補助流体圧ポンプと、
     前記制御弁から前記流体圧ポンプへ向かう作動流体の逆流を防止する逆流防止部と、
     を備えるミキサドラム駆動装置。
    A mixer drum driving device that rotationally drives a mixer drum mounted on a vehicle and capable of loading ready-mixed concrete,
    A fluid pressure pump driven by the vehicle engine;
    A fluid pressure motor that is driven by the working fluid discharged from the fluid pressure pump to rotationally drive the mixer drum;
    A control valve for controlling the flow of working fluid from the fluid pressure pump to the fluid pressure motor;
    An electric motor that rotates by electric power when idling stop of the engine;
    An auxiliary fluid pressure pump that is driven by the rotation of the electric motor to discharge the working fluid and operate the fluid pressure motor;
    A backflow prevention unit for preventing backflow of the working fluid from the control valve toward the fluid pressure pump;
    A mixer drum driving device comprising:
  2.  請求項1に記載のミキサドラム駆動装置であって、
     前記制御弁は、
     前記流体圧ポンプから吐出された作動流体を前記ミキサドラムを正回転させるように前記流体圧モータに導く正転位置と、
     前記流体圧ポンプから吐出された作動流体を前記ミキサドラムを逆回転させるように前記流体圧モータに導く逆転位置と、
     前記流体圧ポンプから前記流体圧モータへの間の作動流体の流れを遮断する遮断位置と、
    を有し、
     前記制御弁は、前記アイドリングストップ時に前記正転位置に維持されるミキサドラム駆動装置。
    The mixer drum driving device according to claim 1,
    The control valve is
    A forward rotation position for guiding the working fluid discharged from the fluid pressure pump to the fluid pressure motor so as to rotate the mixer drum in a forward direction;
    A reverse position for guiding the working fluid discharged from the fluid pressure pump to the fluid pressure motor so as to reversely rotate the mixer drum;
    A blocking position for blocking the flow of the working fluid between the fluid pressure pump and the fluid pressure motor;
    Have
    The control valve is a mixer drum driving device that is maintained at the forward rotation position when the idling is stopped.
  3.  請求項1に記載のミキサドラム駆動装置であって、
     前記逆流防止部は、チェック弁であって、前記流体圧ポンプと前記制御弁との間に設けられるミキサドラム駆動装置。
    The mixer drum driving device according to claim 1,
    The backflow prevention unit is a check valve, and is a mixer drum driving device provided between the fluid pressure pump and the control valve.
  4.  請求項2に記載のミキサドラム駆動装置であって、
     前記逆流防止部は、チェック弁であって、前記制御弁が前記正転位置にある時のみ機能するように前記制御弁に設けられるミキサドラム駆動装置。
    The mixer drum driving device according to claim 2, wherein
    The backflow prevention unit is a check valve, and is a mixer drum driving device provided in the control valve so as to function only when the control valve is in the forward rotation position.
  5.  請求項1に記載のミキサドラム駆動装置であって、
     前記逆流防止部は、切換弁であるミキサドラム駆動装置。
    The mixer drum driving device according to claim 1,
    The backflow prevention unit is a mixer drum driving device which is a switching valve.
  6.  請求項5に記載のミキサドラム駆動装置であって、
     前記切換弁は、前記補助流体圧ポンプから供給されるパイロット圧によって切り換えられるパイロット操作式の切換弁であるミキサドラム駆動装置。
    The mixer drum driving device according to claim 5,
    The mixer drum driving device, wherein the switching valve is a pilot operated switching valve that is switched by a pilot pressure supplied from the auxiliary fluid pressure pump.
PCT/JP2016/086726 2015-12-24 2016-12-09 Mixer drum drive device WO2017110525A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201680075943.8A CN108430828B (en) 2015-12-24 2016-12-09 Stirring roller driving device
NZ743898A NZ743898A (en) 2015-12-24 2016-12-09 Mixer drum driving apparatus
AU2016378702A AU2016378702B2 (en) 2015-12-24 2016-12-09 Mixer drum driving apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-251674 2015-12-24
JP2015251674A JP6335870B2 (en) 2015-12-24 2015-12-24 Mixer drum drive device

Publications (1)

Publication Number Publication Date
WO2017110525A1 true WO2017110525A1 (en) 2017-06-29

Family

ID=59090147

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/086726 WO2017110525A1 (en) 2015-12-24 2016-12-09 Mixer drum drive device

Country Status (5)

Country Link
JP (1) JP6335870B2 (en)
CN (1) CN108430828B (en)
AU (1) AU2016378702B2 (en)
NZ (1) NZ743898A (en)
WO (1) WO2017110525A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111919026A (en) * 2018-04-02 2020-11-10 开利公司 Flush pump and hydraulic system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6285564U (en) * 1985-11-20 1987-06-01
JPH0893707A (en) * 1994-09-29 1996-04-09 Shin Caterpillar Mitsubishi Ltd Hydraulic device of motor-driven type construction machine
JP2013193679A (en) * 2012-03-22 2013-09-30 Kyb Co Ltd Mixer drum driving device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000272405A (en) * 1999-03-23 2000-10-03 Kayaba Ind Co Ltd Hydraulic circuit for driving mixer drum
JP5649177B2 (en) * 2011-03-24 2015-01-07 カヤバ工業株式会社 Mixer drum drive device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6285564U (en) * 1985-11-20 1987-06-01
JPH0893707A (en) * 1994-09-29 1996-04-09 Shin Caterpillar Mitsubishi Ltd Hydraulic device of motor-driven type construction machine
JP2013193679A (en) * 2012-03-22 2013-09-30 Kyb Co Ltd Mixer drum driving device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111919026A (en) * 2018-04-02 2020-11-10 开利公司 Flush pump and hydraulic system

Also Published As

Publication number Publication date
AU2016378702A1 (en) 2018-07-12
NZ743898A (en) 2019-05-31
JP6335870B2 (en) 2018-05-30
CN108430828B (en) 2020-08-14
JP2017114288A (en) 2017-06-29
CN108430828A (en) 2018-08-21
AU2016378702B2 (en) 2019-03-28

Similar Documents

Publication Publication Date Title
US9309899B2 (en) Control device for a hydraulic pump of construction machinery
US9328757B2 (en) Hydraulic system for work machine
CN108884842B (en) Hydraulic system and emergency operation method
WO2014073337A1 (en) Construction machine
KR101747519B1 (en) Hybrid construction machine
WO2015151895A1 (en) Hydraulic system and work machine
JP5823932B2 (en) Hydraulic drive unit for construction machinery
WO2017110525A1 (en) Mixer drum drive device
JP6379120B2 (en) Mixer drum drive device
CN110099816B (en) System for assisting in driving a trailer from an open tipping hydraulic circuit
JP3774014B2 (en) Control device for hydraulic work machine
WO2017170352A1 (en) Shovel
US4015681A (en) Ground driven hydraulic emergency steering system
US9328728B2 (en) Hydrostatic positive displacement machine
US20140314587A1 (en) Check Valve Device In The Suction Side of A Hydrostatic Power-Unit That Can Be Operated In The Same Direction of Rotation As A Pump And As A Motor
JP2003294005A (en) Hydraulic control system
JP6535871B2 (en) Industrial vehicles
JP3872910B2 (en) Hydrostatic transmission device
JP2017114288A5 (en)
CN114396096B (en) Heat dissipation hydraulic system and excavator
JP2006258237A (en) Hydraulic motor unit
JP2744176B2 (en) Work equipment safety equipment
KR20200047336A (en) Hydraulic clutch actuator
WO2020136841A1 (en) Load-sensitive hydraulic fluid supply device for industrial vehicle, and industrial vehicle
JP2000257712A (en) Traveling driving device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16878417

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2016378702

Country of ref document: AU

Date of ref document: 20161209

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 16878417

Country of ref document: EP

Kind code of ref document: A1