US-12624523-B2 - Construction machine

Abstract

On a turn frame of an excavation machine, a hydraulic oil tank is placed in the center of a right engine chamber in the front-back direction, a control valve is placed in front of the hydraulic oil tank, a battery is further placed in front of the control valve, and a cool mechanism is placed behind the hydraulic oil tank. The control valve is supported by a support member, and a controller that outputs a signal for driving the control valve is mounted to a side plate part of the support member, thereby to be placed in a position in front of the control valve and above the battery.

Inventors

• Kohei OKAZAKI

Assignees

• Yanmar Holdings Co., Ltd.

Dates

Publication Date

20260512

Application Date

20241119

Priority Date

20220714

Claims (5)

1. 1 . A construction machine comprising, in a housing chamber on a side of a machine body: a hydraulic oil tank configured to hold a hydraulic oil discharged by a hydraulic pump configured to be driven by a prime mover; a battery positioned in front of the hydraulic oil tank; and a controller configured to be supplied power from the battery, wherein the controller is positioned directly above at least a portion of the battery.
2. 2 . The construction machine according to claim 1 , further comprising a control valve configured to control a flow direction and flowrate of the hydraulic oil to a plurality of hydraulic actuators and configured to be controlled by the controller, wherein each of the plurality of hydraulic actuators is configured to be actuated by the hydraulic oil discharged from the hydraulic pump, and wherein the control valve is positioned in front of the hydraulic oil tank.
3. 3 . The construction machine according to claim 2 , wherein the control valve is positioned between the hydraulic oil tank and the battery.
4. 4 . The construction machine according to claim 3 , wherein the controller is positioned in front of the control valve.
5. 5 . The construction machine according to claim 4 , wherein the controller is configured to be supported on an inner wall of the housing chamber, and the hydraulic oil tank, the control valve, and the battery are installed along the inner wall.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. Pat. No. 18,221,842 filed Jul. 13, 2023, which claims priority to JP Pat. App. 2022-113358 filed Jul. 14, 2022. The entire contents of each application is hereby incorporated by reference. TECHNICAL FIELD The present invention relates to a construction machine that electrically controls a control valve that controls, for example, the direction and flowrate of a hydraulic oil supplied to a hydraulic actuator. BACKGROUND ART Conventionally, a construction machine such as an excavation machine, for example, is provided with devices such as an engine, a work device, a run device, etc., and, so as to electrically control the action of these devices, is further provided with a controller that corresponds to each of these devices. To a power unit such as a control valve, the controller sends an output signal which corresponds to an input signal from an operation part, thereby to causes each device to act. The above controller is provided with an electronic instrument such as a processor that performs an arithmetic process. Due to this, the controller is placed in a place which is not affected by heat and which is protected from a vibration and a shock (see, for example, JP Unex. Pat. App. Pub. 2009-068172). JP Unex. Pat. App. Pub. 2009-068172 discloses a configuration in which the controller is placed on a rear face of a transverse plate that reinforces a support bracket that supports, in a turn frame, a base end part of a front work machine. An electric part, such as the controller, installed on the construction machine is interconnected with a mechanical part, which serves as a power unit, by means of a wire harness as a supply line for electric power and a communication line for a signal. Further, in the construction machine provided with plural hydraulic instruments activated by a hydraulic pressure, a solenoid control valve is employed for the control valve that adjusts the flow direction and flowrate of the hydraulic oil, and the action of the control valves is electrically controlled by the controller. In the above electrically controlled construction machine where the action of the hydraulic instrument is controlled by electricity, the wire harness, as the case may be, is difficult to wire in relation to the layout of each machine part in the turn frame. For example, the area around the position where the controller is placed in the placement configuration disclosed in Patent Document 1 is a space in capable of placing the control valve. This causes the control valve to be placed in a position far from the controller, causing a problem of increasing the difficulty of wiring the wire harness. Further, the controller that outputs the electric signal to the control valve needs to receive a pressure signal of a hydraulic pump that discharges a hydraulic oil toward the control valve. Thus, the controller sends and receives signal to and from plural instruments; thus, in view of the positional relation of each instrument, plural wire harnesses must be wired from one controller. Thus, it is desirable for the controller to be placed in a position where it is easy to wire the wire harnesses from plural instruments. SUMMARY OF INVENTION The present invention has been made in view of the above problem; it is an object of the present invention to simplify, in an electrically controlled construction machine, a wiring of a wire harness between a controller and a control valve. A construction machine according to the present invention, in a housing chamber on a side of a machine body, includes: a hydraulic oil tank that tanks a hydraulic oil discharged by a hydraulic pump driven by a prime mover; a control valve that controls a flow direction and flowrate of the hydraulic oil to a plurality of hydraulic actuators actuated by the hydraulic oil discharged from the hydraulic pump; and a controller that outputs a signal that controls the control valve, wherein the control valve is placed in front of the hydraulic oil tank, and the controller is placed in front of the control valve. The construction machine according to another mode of the present invention, wherein a battery that supplies power to the controller is placed in front of the control valve, and the controller is placed above the battery. The construction machine according to another mode of the present invention, wherein a driver seat is placed on another side of the machine body, and the controller is placed in a position shifted to the driver seat side relative to a center of the battery. The construction machine according to another mode of the present invention, wherein the controller is supported on an inner wall part on the driver seat side within the housing chamber. The construction machine according to another mode of the present invention, wherein the control valve, in plan view, is so placed as to be shifted toward the inner wall part from the hydraulic oil tank's side f