Mixer vehicle

Abstract

To enable prompt discharge of ready mixed-concrete in emergency.SOLUTION: A mixer vehicle 100 includes: a mixer drum 10 rotatably mounted on a vehicle; a drive motor 21 that drives the mixer drum 10 to rotate; and a decelerator 22 that decelerates an input rotation from the drive motor 21 and outputs the input rotation to the mixer drum 10. The mixer vehicle 100 includes an emergency motor 61 connected to an input gear 22a of the decelerator 22 from an axially opposite side from a side to which the drive motor 21 is connected; and an electromagnetic clutch 62 that is provided between the emergency motor 61 and the decelerator 22 and interrupts power transmission between the emergency motor 61 and the decelerator 22.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mixer vehicle. [Background technology]

[0002] Patent Document 1 discloses a mixer vehicle in which a mixer drum is rotated via a reducer by connecting a tool to an emergency input section at the tip of an input shaft of the reducer and operating the tool. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-68532 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an emergency in which the mixer drum loses power from the drive source due to an abnormality or the like, the mixer drum cannot be rotated in the direction of discharge of the fresh concrete to discharge the fresh concrete, which causes the fresh concrete in the mixer drum to solidify. The technology of Patent Document 1 allows the mixer drum to rotate in an emergency, but since it is structured to connect tools, it takes time and effort to discharge the concrete because it is necessary to connect tools, and there is a risk that the solidification of the fresh concrete in the mixer drum will progress.

[0005] The present invention has been made in consideration of such problems, and has an object to enable the rapid discharge of ready-mix concrete in an emergency. [Means for solving the problem]

[0006] The present invention is a mixer vehicle having a mixer drum rotatably mounted on a vehicle, a drive source for driving the mixer drum to rotate, and a reducer for reducing the input rotation from the drive source and outputting it to the mixer drum, characterized in that it is equipped with a motor connected to an input rotating member of the reducer from the axially opposite side to the side to which the drive source is connected, and a clutch provided between the motor and the reducer for connecting and disconnecting power transmission between the motor and the reducer.

[0007] According to this invention, in an emergency in which the mixer drum loses the power of the drive source, the motor and the reducer are connected by a clutch, so that the motor can rotate the mixer drum in the direction of discharging the ready-mixed concrete, thereby enabling the ready-mixed concrete to be discharged quickly. In addition, the reducer for driving the mixer drum can be used as is, so no new mechanism for deceleration is required, and the configuration for emergencies can be simplified. Furthermore, in an emergency, it is sufficient to obtain the minimum rotation speed necessary to discharge the ready-mixed concrete in the mixer drum, so by utilizing the reduction ratio of the reducer, it is possible to use a motor as small as possible.

[0008] In the present invention, the motor is arranged to be rotatably driven about a common axis together with the drive source and the input rotating member of the reducer.

[0009] According to this invention, the motor is arranged coaxially with the drive source and the input rotating member of the reducer, so that the motor is prevented from protruding in the radial direction, which contributes to compactness.

[0010] In addition, the present invention is characterized in that the clutch is electrically connected to a control system for the mixer drum, and is released by energizing the clutch from the control system in response to a rotation command for the mixer drum.

[0011] According to this invention, when the mixer drum rotates normally in response to a rotation command, the motor is separated from the mixer drum by the clutch, so that normal rotation of the mixer drum is not hindered by the motor.

[0012] The present invention is also characterized in that the clutch is electrically connected to a control system for the mixer drum, and is engaged in a state where it is not energized by the control system in the event of an electrical failure in the control system that makes it impossible to drive the mixer drum using power from the drive source, or in the event of an emergency stop in which an emergency stop operation is performed on the control system.

[0013] According to this invention, when an electrical failure in the control system makes it impossible to drive the mixer drum with the power of the drive source, the clutch is engaged, so that the ready-mixed concrete can be discharged quickly using the motor. Also, even during an emergency stop, the mixer drum can be rotated by the motor, so that ready-mixed concrete can be discharged quickly by safely operating the motor at the minimum rotation speed that allows the ready-mixed concrete to be discharged, even while the drive source is prohibited from being driven by the emergency stop.

[0014] In addition, the present invention further includes an operating unit capable of performing a discharge rotation operation in which the motor rotates the mixer drum in the direction of discharging fresh concrete, and when the discharge rotation operation is performed when the clutch is engaged, the motor rotates the mixer drum in the direction of discharging fresh concrete, and when the discharge rotation operation is not performed when the clutch is engaged, the motor functions as a brake to brake the rotation of the mixer drum.

[0015] According to this configuration, even when the clutch is not energized in the event of an electrical failure or an emergency stop, the rotation of the mixer drum can be prevented or suppressed until the discharge rotation operation is performed. Therefore, it is possible to prevent or suppress the mixer drum from suddenly rotating (reversely rotating) due to uneven distribution of fresh concrete in the mixer drum immediately after the ignition switch is turned off, immediately after an electrical failure occurs, or immediately after an emergency stop operation. In addition, since the rotation of the mixer drum can be prevented or suppressed even after the discharge rotation operation is completed, the safety of work is ensured when performing chipping work to peel off fresh concrete stuck in the mixer drum. Effect of the Invention

[0016] These inventions make it possible to quickly discharge ready mixed concrete in an emergency. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a plan view of the mixer truck according to the embodiment of the present invention as viewed from the side. [Diagram 2] 1 is a configuration diagram showing a main part of a mixer truck according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0019] First, the overall configuration of a mixer truck 100 according to an embodiment of the present invention will be described with reference to Figures 1 and 2. The mixer truck 100 is a vehicle that transports so-called ready mixed concrete (hereinafter referred to as "ready mixed concrete") such as mortar or ready mixed concrete, and runs on the power of an engine (not shown). The driving source for running the vehicle may be, for example, a running motor or an engine and a running motor. In the following description, a case where the mixer truck 100 is loaded with ready mixed concrete will be described.

[0020] As shown in FIG. 1, the mixer truck 100 includes a driver's cab 1, a stand 2 extending in the fore-and-aft direction of the vehicle, a mixer drum 10 rotatably mounted on the stand 2, a drum drive unit 20 that drives and rotates the mixer drum 10, a hopper 30 that guides ready mixed concrete fed from the outside into the mixer drum 10, and a chute 40 that guides ready mixed concrete discharged from the mixer drum 10 to a predetermined position.

[0021] The mixer drum 10 is a cylindrical container that rotates around a rotation axis C1. An opening 10a through which fresh concrete is charged and discharged is provided at the rear end of the mixer drum 10 on the rear side of the vehicle, and a drive shaft 11 extending outward along the rotation axis C1 is provided at the front end on the front side of the vehicle. The mixer drum 10 is supported by the frame 2 with the rear end side where the opening 10a is provided being raised higher than the front end side.

[0022] The drive shaft 11 of the mixer drum 10 is connected to a drum drive device 20. As shown in Fig. 2, the drum drive device 20 includes a drive motor 21 that is a drive source of the mixer drum 10, and a reducer 22 that reduces the input rotation from the drive motor 21 and outputs it to the mixer drum 10, and the drive shaft 11 of the mixer drum 10 is connected to the drive motor 21 via the reducer 22. The drive motor 21 is configured by an electric motor that can rotate forward and backward. Therefore, the mixer drum 10 is rotationally driven in the forward rotation direction or the reverse rotation direction by the drive motor 21. The drive source of the mixer drum 10 may be a hydraulic motor.

[0023] Returning to FIG. 1, a pair of blades 12, 13 are arranged in a spiral shape along the inner wall surface of the mixer drum 10. Each blade 12, 13 is divided into a front blade 12a, 13a arranged on the front side of the vehicle and a rear blade 12b, 13b arranged on the rear side of the vehicle at the approximately middle part of the mixer drum 10. Each rear blade 12b, 13b is joined to the inner wall surface of the mixer drum 10 at the opening 10a and is joined to a cylindrical seal pipe 14 arranged on the rotation axis C1 of the mixer drum 10. The seal pipe 14 is provided to smoothly guide the ready mixed concrete charged into the hopper 30 into the inside of the mixer drum 10.

[0024] The hopper 30 is disposed above the opening 10a of the mixer drum 10 in order to guide the ready mixed concrete charged from above the mixer vehicle 100 into the mixer drum 10 through the seal pipe 14. A hopper cover 31 that covers the opening of the hopper 30 is provided on the upper part of the hopper 30 so as to be rotatable via a hinge 31a. Meanwhile, a chute 40 is disposed below the opening 10a of the mixer drum 10 to guide the ready mixed concrete discharged from the mixer drum 10 to a predetermined position.

[0025] The mixer truck 100 has three operating states of the mixer drum 10: a stirring state in which the mixer drum 10 is rotated at a first rotation speed to stir the ready-mixed concrete in the mixer drum 10, a kneading state in which the mixer drum 10 is rotated at a second rotation speed faster than the first rotation speed to knead the ready-mixed concrete in the mixer drum 10, and a discharge state in which the mixer drum 10 is rotated in the opposite direction to the stirring and kneading states to discharge the ready-mixed concrete from an opening 10a.

[0026] In the mixing state, the mixer drum 10 is driven to rotate in a forward direction, which is a counterclockwise direction when viewed from the rear of the vehicle. In the mixing state, the blades 12, 13 rotate forward together with the mixer drum 10, so that the ready-mixed concrete in the mixer drum 10 moves to the front of the mixer drum 10 while being mixed. By rotating the mixer drum 10 in this way to mix the ready-mixed concrete, separation or solidification of the ready-mixed concrete is suppressed.

[0027] In the kneading state, the mixer drum 10 is rotated in the forward rotation direction at a second rotation speed that is faster than the first rotation speed of the mixer drum 10 in the agitating state. The kneading state is performed to knead the ready-mixed concrete before discharging it.

[0028] In the discharge state, the mixer drum 10 is driven to rotate in the reverse direction, that is, clockwise as viewed from the rear of the vehicle. In the discharge state, the blades 12, 13 rotate together with the mixer drum 10, so that the ready-mixed concrete moves to the rear of the mixer drum 10 while being agitated. By rotating the mixer drum 10 in this manner, the ready-mixed concrete can be discharged from the opening 10a of the mixer drum 10. The ready-mixed concrete discharged from the opening 10a of the mixer drum 10 is guided to a predetermined position via the chute 40.

[0029] 2, the drum driving device 20 further includes a high-voltage battery 23 used to supply power to the driving motor 21, and an inverter 24 that converts a direct current supplied from the high-voltage battery 23 into a three-phase alternating current and supplies the three-phase alternating current to the driving motor 21. The high-voltage battery 23 has an output voltage of, for example, DC 300 V. The inverter 24 generates the three-phase alternating current based on a command from the controller 50, and the driving motor 21 is controlled by the three-phase alternating current generated by the inverter 24.

[0030] The inverter 24 includes a switching circuit 24a that performs a switching operation using a switching element, a detection unit 24b that detects the output current and applied voltage of each phase of the inverter 24, and a fail-safe circuit 24c that protects the inverter 24 in the event of an abnormality. The switching elements of the switching circuit 24a are, for example, semiconductor switching elements such as IGBTs and MOSFETs, and generate a three-phase AC current by performing a switching operation based on a command from the controller 50. The detection unit 24b is used to detect abnormalities such as short-circuiting and open-circuiting of the switching elements in addition to disconnection. The fail-safe circuit 24c shorts the coil of the drive motor 21 by operating the switching element in the event of an abnormality, for example. The detection unit 24b may detect the input current of the inverter 24, or may perform state detection to detect other abnormalities that make it impossible to drive the mixer drum 10 with the power of the drive motor 21, such as an abnormality that requires the operation of the fail-safe circuit 24c.

[0031] The controller 50 is a control device for the mixer drum 10, and is composed of a microcomputer equipped with a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an I / O interface (Input / Output Interface), etc. The RAM stores data for CPU processing, the ROM stores the CPU's control program and the like in advance, and the I / O interface is used for inputting and outputting information to and from connected devices. By operating the CPU, RAM, etc. according to the program stored in the ROM, the operation of the drum driving device 20, that is, the operation of the driving motor 21 through the operation of the inverter 24, is controlled, and the mixer drum 10 is thereby controlled.

[0032] The controller 50 is programmed to be capable of executing at least the processes necessary for executing the control according to this embodiment. The controller 50 may be composed of a plurality of microcomputers. The controller 50 may be configured as a single device, or may be divided into a plurality of devices and configured to perform distributed processing of the control according to this embodiment among the plurality of devices.

[0033] The detection unit 24b is electrically connected to the controller 50, and various detection values ​​detected by the detection unit 24b are input to the controller 50. The inverter 24 is also connected to the controller 50, and a command value for operating the inverter 24 is output from the controller 50.

[0034] An IGSW (ignition switch) 81 is further electrically connected to the controller 50, and the on / off of the power supply that supplies power to the controller 50 is switched by the IGSW 81. The IGSW 81 is electrically connected to a low-voltage battery 70, which will be described later, and an ACC (accessory) power supply and an IG power supply are configured as power supplies that can be turned on / off by the IGSW 81 based on the low-voltage battery 70. The ACC power supply mainly supplies power to electrical components and small electrical devices that consume low power, and the IG power supply mainly supplies power to electrical devices that consume high power.

[0035] The IGSW 81 has an ACC position for turning on the ACC power supply and an IG position for turning on the IG power supply. Therefore, when the IGSW 81 is switched to the ACC position, the ACC power supply is turned on, and when the IGSW 81 is switched to the IG position, the IG power supply is turned on. The ACC power supply is not an IG power supply (different from the IG power supply), but it is also turned on in the IG position. The IGSW 81 may be of either a rotary type or a push type. When the drive source for traveling of the mixer vehicle 100 is a traveling motor, that is, when the mixer vehicle 100 is an EV, a switch that turns on / off multiple power supplies that can be turned on / off, similar to the IGSW 81, can be used instead of the IGSW 81.

[0036] The controller 50 is powered from the ACC power supply in the ACC position, and from the IG power supply in the IG position. In the ACC position, the electrical system of the ACC power supply indicated by the thin solid line is enabled (ACC ON), and in the IG position, the electrical system of the IG power supply indicated by the thin dashed line is enabled (IG ON).

[0037] The switching circuit 24a of the inverter 24 is electrically connected to the controller 50 by using the electrical system of the IG power supply. In other words, the switching circuit 24a is configured as the electrical system of the IG power supply. For this reason, the inverter 24 is operable in the IG position, and cannot be operated when the IGSW 81 is switched from the IG position to the ACC position or to a position other than the IG position (IG off). Therefore, when the IG is off, the mixer drum 10 cannot be driven by the power of the drive motor 21. In the following, the case of IG off will be described as the case of ACC on.

[0038] When the IG is off, the drive motor 21 is in a state where the rotating shaft 21a can rotate freely by itself. Even when the drive source of the mixer drum 10 is a hydraulic motor, the solenoid valves of the hydraulic circuit that controls the hydraulic motor are not energized when the IG is off. As a result, the rotating shaft of the hydraulic motor is in a state where it can rotate to the extent that the mixer drum 10 can rotate, for example, when the ready-mixed concrete in the mixer drum 10 is not shifted or chipped when the mixer drum 10 is stopped from rotating.

[0039] An emergency stop SW 82 is further electrically connected to the controller 50. The emergency stop SW 82 is connected to an electrical system of the IG power supply of the controller 50, and when the emergency stop SW 82 is turned on (emergency stop operation), the electrical system of the IG power supply of the controller 50 is cut off and becomes non-energized. Therefore, even in the event of an emergency stop, the mixer drum 10 cannot be driven by the power of the drive motor 21. The controller 50, together with the drum drive device 20, constitutes a control system 90 for the mixer drum 10. The control system 90 further includes an IGSW 81 and the emergency stop SW 82.

[0040] In the event of an emergency in which the mixer vehicle 100 loses power from the drive motor 21 due to an abnormality or the like, the drive motor 21 cannot rotate the mixer drum 10 in the reverse direction (concrete discharge direction) to quickly discharge the concrete, and the concrete in the mixer drum 10 will continue to solidify. For this reason, the mixer vehicle 100 is configured as described below.

[0041] 1 and 2, the mixer vehicle 100 further includes an emergency drive device 60. Fig. 2 is a configuration diagram of the mixer drum 10, the drive motor 21, the reducer 22, and the emergency drive device 60 viewed from above, and the emergency drive device 60 further includes an emergency motor 61 connected to the mixer drum 10 via the reducer 22 separately from the drive motor 21, and an electromagnetic clutch 62 provided between the emergency motor 61 and the reducer 22, i.e., in a power transmission path connecting the emergency motor 61 and the reducer 22.

[0042] The emergency motor 61 is an electric motor, and is connected to an input gear 22a, which is an input rotating member of the reducer 22, from the axially opposite side to the side to which the drive motor 21 is connected. The input rotating member may be the input shaft of the reducer 22. The electromagnetic clutch 62 connects and disconnects the power transmission between the emergency motor 61 and the reducer 22. The electromagnetic clutch 62 is released when energized to interrupt the power transmission between the emergency motor 61 and the reducer 22, and is engaged when not energized to connect the emergency motor 61 and the reducer 22. In other words, the electromagnetic clutch 62 is a normally closed type clutch that is released and engaged depending on whether or not it is energized.

[0043] The electromagnetic clutch 62, which is engaged when de-energized, can be engaged by turning the IGSW 81 off in an emergency in which the drive motor 21 loses its power. Therefore, the mixer drum 10 is rotated in the reverse direction by the emergency motor 61 via the electromagnetic clutch 62, so that the ready-mixed concrete can be discharged quickly. In addition, since the reducer 22 for driving the mixer drum 10 can be used as is, no new mechanism for deceleration is required, and the configuration for an emergency can be simplified. Furthermore, since it is sufficient to obtain the minimum rotation (for example, a rotation speed of 1 to 2 rpm) required to discharge the ready-mixed concrete in the mixer drum 10 in an emergency, a motor as small as possible can be used for the emergency motor 61 by utilizing the reduction ratio of the reducer 22.

[0044] Instead of the electromagnetic clutch 62, an electric clutch may be used that is driven by an electric actuator and is released when energized and engaged when de-energized. In this case, as in the case where the electromagnetic clutch 62 is used, the ready-mixed concrete can be discharged quickly.

[0045] The emergency motor 61 is arranged to rotate around a common axis A1 with the drive motor 21 and the input gear 22a of the reducer 22. The common axis A1 is, for example, the rotation axis of the input gear 22a, and in this case, the rotation axis 21a of the drive motor 21 and the rotation axis 61a of the emergency motor 61 are aligned with the rotation axis of the input gear 22a, so that the drive motor 21, the emergency motor 61, and the input gear 22a are arranged coaxially. As a result, the radial protrusion of the emergency motor 61 is suppressed, and compactness is achieved.

[0046] The input gear 22a of the reducer 22 meshes with the output gear 22b of the reducer 22. The number of teeth of the output gear 22b is set to be greater than the number of teeth of the input gear 22a, and the rotation of the input gear 22a is reduced by the output gear 22b. The drive shaft 11 of the mixer drum 10 is connected to the output gear 22b of the reducer 22 from the axially opposite side to the side to which the drive motor 21 is connected. On the other hand, the rotation axes of the input gear 22a and the output gear 22b are radially spaced apart from each other, which creates a surplus space for installing an emergency drive device 60 connected to the input gear 22a from the same axial side as the mixer drum 10. The reducer 22 may have a structure in which a gear is further interposed between the input gear 22a and the output gear 22b, or may have a structure having a planetary gear mechanism.

[0047] The mixer vehicle 100 includes a low-voltage battery 70 in addition to the high-voltage battery 23. The low-voltage battery 70 has an output voltage of, for example, DC 24V, and power is supplied from the low-voltage battery 70 to the emergency motor 61. A discharge rotation SW 83 for driving the emergency motor 61 is connected to the emergency motor 61. The discharge rotation SW 83 is an operation unit capable of performing a discharge rotation operation for driving the emergency motor 61 in the reverse rotation direction, and is provided, for example, on an operation panel outside the cab 1. This allows the discharge rotation SW 83 to be operated while checking the situation around the mixer drum 10 and the rotation of the mixer drum 10. The discharge rotation SW 83 uses the electrical system of the ACC power supply.

[0048] The electromagnetic clutch 62 is electrically connected to the controller 50 of the control system 90 using the electrical system of the IG power supply, and is controlled by the controller 50. The electromagnetic clutch 62 is released in response to a rotation command for the mixer drum 10 under the control of the controller 50. The presence or absence of a rotation command for the mixer drum 10 can be determined based on internal processing of the controller 50, for example, by checking the on / off state of a drive flag that is turned on when the mixer drum 10 is driven. The presence or absence of a rotation command for the mixer drum 10 may also be determined based on a signal from the detection unit 24b of the inverter 24.

[0049] A clutch release command is input from the controller 50 to the electromagnetic clutch 62 in response to a rotation command for the mixer drum 10. As a result, the electromagnetic clutch 62 is energized by the controller 50 (and therefore energized by the control system 90) and released. Therefore, when the mixer drum 10 rotates normally in response to the rotation command, the electromagnetic clutch 62 separates the emergency motor 61 from the mixer drum 10. Therefore, the normal rotation of the mixer drum 10 is not hindered by the emergency motor 61.

[0050] When the rotation command for the mixer drum 10 is no longer given, the clutch release command is no longer input from the controller 50 to the electromagnetic clutch 62. As a result, the electromagnetic clutch 62 is in a state where it is not energized by the controller 50 (and therefore is not energized by the control system 90) and is engaged. In other words, the electromagnetic clutch 62 is released or engaged depending on the presence or absence of a control command from the controller 50 as the presence or absence of energization.

[0051] The controller 50 detects an electrical failure in the control system 90 for the mixer drum 10 as an abnormality in the inverter 24 based on a signal from the detection unit 24b of the inverter 24. The electrical failure is an electrical failure that makes it impossible to drive the mixer drum 10 with the power of the drive motor 21, and for example, a disconnection in the inverter 24, as well as a short-circuited or open-stuck switching element, etc., are detected as the electrical failure. The electrical failure in the control system 90 also includes a disconnection in the electrical system of the IG power supply, a contact failure in the IG position of the IGSW 81, a failure of the controller 50, etc.

[0052] When the controller 50 detects an electrical failure, it activates the fail-safe circuit 24c of the inverter 24 to protect the inverter 24. When the fail-safe circuit 24c is activated, the inverter 24 is also placed in a state in which the drive motor 21 cannot be driven due to the activation of the inverter 24.

[0053] When an electrical failure is detected, the controller 50 also performs fail-safe control to prohibit a clutch release command to the electromagnetic clutch 62. As a result, the electromagnetic clutch 62 is engaged in a state where it is not energized. Therefore, the electromagnetic clutch 62 is engaged in a state where it is not energized by the controller 50 not only when the IG is off, but also when there is an electrical failure in the control system 90. As a result, even if an electrical failure occurs in the control system 90 and it becomes impossible to drive the mixer drum 10 with the power of the drive motor 21, the ready-mixed concrete can be discharged quickly using the emergency motor 61.

[0054] As described above, when the emergency stop SW82 is turned on, the controller 50 cuts off the electrical system of the IG power supply and puts it into a non-energized state. Therefore, the electromagnetic clutch 62 is engaged in a state where it is not energized by the controller 50 even during an emergency stop. This allows the mixer drum 10 to be rotated by the emergency motor 61 even during an emergency stop. Therefore, while the drive motor 21 is prohibited from being driven by an emergency stop, the emergency motor 61 can be safely operated at the minimum rotation speed that allows the ready-mixed concrete to be discharged, thereby enabling the ready-mixed concrete to be discharged quickly during an emergency stop.

[0055] The emergency motor 61 is connected to the low-voltage battery 70 via a changeover SW 84. The changeover SW 84 is a switch that connects and disconnects the emergency motor 61 and the low-voltage battery 70 that supplies power to the emergency motor 61, and is switched as follows.

[0056] That is, the switch SW 84 has a connection position and a short circuit position, and the position is switched between the connection position and the short circuit position. Fig. 2 shows the switch SW 84 in a state where it is switched to the short circuit position.

[0057] In the connected position, the positive wiring 61b of the emergency motor 61 is connected to the positive terminal 70a of the low-voltage battery 70, and the negative wiring 61c of the emergency motor 61 is connected to the negative terminal 70b of the low-voltage battery 70. As a result, the emergency motor 61 is connected to the low-voltage battery 70. In the short-circuit position, the positive wiring 61b of the emergency motor 61 is connected to the negative wiring 61c. As a result, a closed circuit SC including the emergency motor 61 is formed, as shown in FIG. 2.

[0058] The switch SW84 forms a closed circuit SC, causing the emergency motor 61 to function as a brake. Therefore, in the short-circuit position, the emergency motor 61 functioning as a brake brakes the rotation about the common axis A1, thereby braking the rotation of the mixer drum 10.

[0059] An operating circuit 85 for the switch 84 is electrically connected to the switch 84. An electrical system of the ACC power supply is used for the switch 84 and the operating circuit 85. As shown in Fig. 2, the discharge rotation switch 83 is electrically connected to the operating circuit 85, and when a discharge rotation operation is performed using the discharge rotation switch 83, the operating circuit 85 sets the switch 84 to the connection position and connects the emergency motor 61 and the low-voltage battery 70.

[0060] As a result, regardless of whether the electromagnetic clutch 62 is not energized during an electrical failure or an emergency stop (in other words, including when the electromagnetic clutch 62 is not energized), power is supplied from the low-voltage battery 70 to the emergency motor 61, so that the emergency motor 61 can be driven. In this case, the emergency motor 61 does not function as a brake, so the rotation of the mixer drum 10 is permitted without being braked.

[0061] When the discharge rotation operation is not being performed using the discharge rotation SW 83, the operating circuit 85 sets the switch SW 84 to a short-circuit position to form a closed circuit SC. Therefore, when the discharge rotation operation is not being performed, the emergency motor 61 functions as a brake regardless of whether the electromagnetic clutch 62 is de-energized or not.

[0062] Even in this case, when the mixer drum 10 rotates normally in response to a rotation command, the electromagnetic clutch 62 is released in response to the rotation command of the mixer drum 10, so there is no hindrance to the rotation of the mixer drum 10. As a result, it is not necessary to switch the switch SW 84 depending on whether the electromagnetic clutch 62 is not energized in the event of an electrical failure or an emergency stop, etc., so that the operating circuit 85 can be simplified. In addition, since the switch SW 84 causes the emergency motor 61 to function as a brake, it is also advantageous in terms of cost compared to using, for example, a motor with a brake instead of the emergency motor 61.

[0063] By making the emergency motor 61 function as a brake when the discharge rotation operation is not being performed, including when the electromagnetic clutch 62 is not energized during an electrical failure or emergency stop, it is possible to prevent or suppress the mixer drum 10 from suddenly rotating (reverse rotating) due to uneven distribution of fresh concrete in the mixer drum 10 immediately after the IG off operation, the occurrence of an electrical failure, or an emergency stop operation. In addition, since the rotation of the mixer drum 10 can be prevented or suppressed even after the discharge rotation operation is completed, the safety of work such as chipping work to peel off fresh concrete stuck in the mixer drum 10 is also ensured.

[0064] As described above, the emergency motor 61 is supplied with power from the low-voltage battery 70, and the electrical system of the ACC power supply is used for the discharge rotation switch 83, the changeover switch 84, and the operating circuit 85. Therefore, the emergency motor 61 can be driven by receiving power supply from the low-voltage battery 70 even when the mixer drum 10 cannot be driven by the power of the drive motor 21 due to an IG off operation, an electrical failure of the control system 90, or an emergency stop operation.

[0065] The emergency motor 61 may further switch the switch SW 84 depending on whether an electrical failure or an emergency stop has occurred. This makes it possible to suppress unnecessary power consumption by disabling the discharge rotation operation when there is no emergency. In this case, the controller 50 can be configured to output a signal to the operation circuit 85 via the electrical system of the ACC power supply when there is an electrical failure or an emergency stop, and the operation circuit 85 can be configured to switch the switch SW 84 depending on whether there is an electrical failure or an emergency stop based on the signal.

[0066] Instead of providing the operation circuit 85, the controller 50 may control the switch SW 84. In this case, by electrically connecting the discharge rotation SW 83 and the switch SW 84 to the controller 50 using the electrical system of the ACC power supply, the switch SW 84 can be controlled depending on whether or not the discharge rotation operation is performed, and the switch SW 84 can be controlled by the controller 50 even when the IG is off, when there is an electrical failure, or when there is an emergency stop.

[0067] The configuration, operation, and effects of the embodiment of the present invention will be described below.

[0068] The mixer vehicle 100 has a mixer drum 10 rotatably mounted on the vehicle, a drive motor 21 that drives and rotates the mixer drum 10, and a reducer 22 that reduces the input rotation from the drive motor 21 and outputs it to the mixer drum 10.It is also equipped with an emergency motor 61 connected to the input gear 22a of the reducer 22 from the axially opposite side to the side to which the drive motor 21 is connected, and an electromagnetic clutch 62 provided between the emergency motor 61 and the reducer 22 to disconnect the power transmission between the emergency motor 61 and the reducer 22.

[0069] According to this configuration, in an emergency in which the mixer drum 10 loses the power of the drive motor 21, the emergency motor 61 can be rotated in the reverse direction by the emergency motor 61 by connecting the emergency motor 61 and the reducer 22 with the electromagnetic clutch 62, so that the ready-mixed concrete can be discharged quickly. In addition, since the reducer 22 used for driving the mixer drum 10 can be used as is, no new mechanism for deceleration is required, and the configuration for an emergency can be simplified. Furthermore, since it is sufficient to obtain the minimum rotation speed required to discharge the ready-mixed concrete in the mixer drum 10 in an emergency, the reduction ratio of the reducer 22 can be used to use a motor as small as possible.

[0070] The emergency motor 61 is arranged to be rotated around a common axis A1 together with the drive motor 21 and the input gear 22a of the reducer 22.

[0071] According to this configuration, the emergency motor 61 is arranged coaxially with the drive motor 21 and the input gear 22a of the reducer 22, so that the emergency motor 61 is prevented from protruding in the radial direction, which contributes to compactness.

[0072] The electromagnetic clutch 62 is electrically connected to a control system 90 for the mixer drum 10, and is released when current is applied from the control system 90 in response to a rotation command for the mixer drum 10.

[0073] According to this configuration, when the mixer drum 10 rotates normally in response to a rotation command, the emergency motor 61 is disconnected from the mixer drum 10 by the electromagnetic clutch 62, so that the normal rotation of the mixer drum 10 is not hindered by the emergency motor 61.

[0074] The electromagnetic clutch 62 is electrically connected to the control system 90 for the mixer drum 10, and is engaged in the event of an electrical failure in the control system 90 that makes it impossible to drive the mixer drum 10 with power from the drive motor 21, or in the event of an emergency stop in which an emergency stop operation is performed on the control system 90.

[0075] According to this configuration, when the mixer drum 10 cannot be driven by the power of the drive motor 21 due to an electrical failure of the control system 90, the electromagnetic clutch 62 is engaged, so that the ready-mixed concrete can be discharged quickly using the emergency motor 61. Also, even during an emergency stop, the mixer drum 10 can be rotated by the emergency motor 61, so that the ready-mixed concrete can be discharged quickly by safely operating the emergency motor 61 at the minimum rotation speed that allows the ready-mixed concrete to be discharged, even while prohibiting the drive motor 21 from being driven by an emergency stop.

[0076] The mixer vehicle 100 further includes a discharge rotation SW 83 which is an operating unit capable of performing a discharge rotation operation for driving the mixer drum 10 in a reverse rotation direction by the emergency motor 61. When a discharge rotation operation is performed while the electromagnetic clutch 62 is engaged and not energized, the emergency motor 61 drives the mixer drum 10 in a reverse rotation direction, and when a discharge rotation operation is not performed while the electromagnetic clutch 62 is not energized, the emergency motor 61 functions as a brake for braking the rotation of the mixer drum 10.

[0077] According to this configuration, even when the electromagnetic clutch 62 is not energized in the event of an electrical failure or an emergency stop, the rotation of the mixer drum 10 can be prevented or suppressed until the discharge rotation operation is performed. Therefore, it is possible to prevent or suppress the mixer drum 10 from suddenly rotating (reversely rotating) due to uneven distribution of the fresh concrete in the mixer drum 10 immediately after the IG-off operation, immediately after the occurrence of an electrical failure, or immediately after an emergency stop operation. In addition, since the rotation of the mixer drum 10 can be prevented or suppressed even after the discharge rotation operation is completed, the safety of work is ensured when performing chipping work to peel off the fresh concrete stuck in the mixer drum 10.

[0078] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments. [Explanation of symbols]

[0079] 10···mixer drum, 21···drive motor (drive source), 22···reduction gear, 22a···input gear (input rotating member), 61···emergency motor (motor, brake, DC motor), 61b···positive wiring, 61c···negative wiring, 62···electromagnetic clutch (clutch), 70···low voltage battery (battery), 83···discharge rotation switch (operation unit), 84···changeover switch (switch), 90···control system, 100···mixer vehicle, A1···common axis, SC···closed circuit

Claims

1. A mixer truck, A mixer drum rotatably mounted on the vehicle; A drive source that rotates the mixer drum; a reducer that reduces the speed of the input rotation from the drive source and outputs the reduced speed to the mixer drum, a motor connected to an input rotating member of the reducer from an axially opposite side to a side connected to the driving source; a clutch provided between the motor and the reducer for connecting and disconnecting power transmission between the motor and the reducer; A mixer truck characterized by:

2. 2. The mixer vehicle according to claim 1, The motor is arranged to rotate around a common axis line with the drive source and the input rotating member of the reduction gear. A mixer truck characterized by:

3. 2. The mixer vehicle according to claim 1, The clutch is electrically connected to a control system of the mixer drum, and is released by energizing the clutch from the control system in response to a rotation command of the mixer drum. A mixer truck characterized by:

4. 2. The mixer vehicle according to claim 1, The clutch is electrically connected to a control system for the mixer drum, and is engaged in a state where it is not energized by the control system when an electrical failure occurs in the control system such that the mixer drum cannot be driven by the power of the drive source, or when an emergency stop operation is performed on the control system. A mixer truck characterized by:

5. 2. The mixer vehicle according to claim 1, The mixer drum may be rotated by the motor in a direction to discharge fresh concrete. The motor is When the discharge rotation operation is performed while the clutch is engaged, the mixer drum is rotated in the direction of discharge of fresh concrete, When the clutch is engaged, if the discharge rotation operation is not being performed, the clutch functions as a brake for braking the rotation of the mixer drum. A mixer truck characterized by:

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