Hitachi Construction Machinery Patente

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

The battery device (26) mounted on the vehicle body frame (5) is composed of a multi-stage battery frame (27) having vertically stacked first support frame body (28), second support frame body (29), third support frame body (30), fourth support frame body (31), and a plurality of battery modules (35) that are detachably attached to each of these first support frame body (28), second support frame body (29), third support frame body (30), fourth support frame body (31).

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

The dump truck (1) includes a vehicle body frame (5) to which front wheels (3) and rear wheels (4) are attached, an travel electric motor (25) driving the rear wheels (4), a battery device (26) mounted on the vehicle body frame (5) supplying electric power to the travel electric motor (25), and electrical equipment including a converter (34) arranged on the rear side of the battery device (26). The battery device (26) is configured to include a battery frame (27) supported by the vehicle body frame (5) and a battery module (33) attached to the battery frame (27). The battery frame (27) is formed with a refrigerant pipe housing section (32) housing a first refrigerant pipe (45) through which refrigerant cooling the battery module (33) flows, and a second refrigerant pipe (50) through which refrigerant cooling the electrical equipment flows.

The present invention aims to provide a hydraulic drive system capable of improving the operability of a hydraulic actuator by suppressing shock when switching from the state where the hydraulic pump accumulates in the accumulator to the state where the hydraulic pump drives the hydraulic actuator. Therefore, when the detection value of the first pressure sensor falls below a predetermined first threshold without an operation signal being input, the controller communicates the hydraulic pump to the accumulator while interrupting the hydraulic pump and hydraulic actuator and interrupting the hydraulic pump and tank. When an operation signal is input while pressure oil is being supplied from the hydraulic pump to the accumulator, the controller reduces the opening of the accumulator flow control valve and communicates the hydraulic pump to the tank while interrupting the hydraulic pump and the hydraulic actuator. Then, after a predetermined time has elapsed or after the pressure of the hydraulic pump has decreased, the controller communicates the hydraulic pump and the hydraulic actuator.

The vehicle body frame (2) consists of a left frame (2A) and a right frame (2B) extending in the longitudinal direction, a left pillar (2C) extending upwards from the left frame (2A), a right pillar (2D) extending upwards from the right frame (2B), and a beam (2E) extending in the lateral direction and attached across the upper parts of the left pillar (2C) and the right pillar (2D). The battery device (11) is arranged between the left pillar (2C) and the right pillar (2D) with a plurality of battery modules (12). In the plurality of battery modules (12), one end side in the longitudinal direction becomes the electrical wiring connection part (12A) for connecting electrical wirings (15), and the other end side in the longitudinal direction becomes the temperature control liquid pipe connection part (12B) for connecting temperature control liquid pipes (16).

The dump truck (1) is equipped with a vehicle body frame (5) to which front wheels (3) and rear wheels (4) are attached, an electric motor (25) to drive the rear wheels (4), a battery device (26) mounted on the vehicle body frame (5) to supply power to the electric motor (25), and electrical device including a converter (34) arranged on the rear side of the battery device (26) . Below the battery device (26), a first refrigerant line (45) through which refrigerant flows to cool the battery device (26) and a second refrigerant line (54) through which refrigerant flows to cool the electrical device are arranged.

The battery (25) mounted on the vehicle body frame (5) is positioned at the front side part of the vehicle body frame (5), and the DC/DC converter (29) is located between the front wheel (3) and the rear wheel (4) and is positioned on the lateral side of the vehicle body frame (5). The boost reactor (26) is positioned on the rear side of the battery (25) in a state facing the battery (25) in the longitudinal direction, the hydraulic pump drive motor (27) is positioned on the rear side of the boost reactor (26), and the pump drive inverter (28) is positioned on the rear side of the hydraulic pump drive motor (27).

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A speed-changing device (21) is provided with an input shaft (22), an output shaft (23), a planetary stepless speed-changing mechanism (24), a multistage speed-changing mechanism (26) and a controller (25). The multistage speed-changing mechanism (26) is provided with a forward rotation mode in which a forward one-speed clutch (69) is connected and a reverse rotation mode in which a backward one-speed clutch (70) is connected. The controller (25) starts the switch from an engagement state to a disengagement state of the forward one-speed clutch (69) and starts the switch from a disengagement state to an engagement state of the backward one-speed clutch (70) when rotation of the output shaft (23) is in a forward rotation state (forward state) at the switching from the forward rotation mode to the reverse rotation mode.

A speed-changing device (21) is provided with an input shaft (22), an output shaft (23), a planetary stepless speed-changing mechanism (24), a direct joint mechanism (27), an idler element (28), a multistage speed-changing mechanism (26) and a controller (25). The controller (25) controls a rotation speed of a first variator (33) in the planetary stepless speed-changing mechanism (24) and engagement/disengagement of a first clutch (27C) in the direct joint mechanism (27). The controller (25) can switch the speed-changing device (21) to three power transmission states composed of a first power transmission state (stepless speed change), a second power transmission state (internal lockup) and a third power transmission state (external lockup).

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …