# US 11,305,641 B2 · Construction machine

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- Number: US 11,305,641 B2
- Document ID: US11305641B2
- Status: Granted
- Kind: B2
- Application number: 16/987,633
- Filed: 2020-08-07
- Published: 2020-11-19
- Granted: 2022-04-19
- Earliest claimed: 2016-02-29
- Assignees: Yanmar Power Technology Co., Ltd.
- Applicants: Yanmar Power Technology Co., Ltd.
- Inventors: Kohei Okazaki; Umpei Nonaka; Takeshi Takaira
- Web page: https://patentgrep.com/patent/US11305641B2

## CPC

- B60K 13/02: concerning intake
- F01P 3/20: Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence)
- E02F 9/00: Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00 (laying-out or take-up devices for trailing electric cables B66C)
- E02F 9/0866: {Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment}
- F01P 1/06: Arrangements for cooling other engine or machine parts
- F01P 5/06: Guiding or ducting air to, or from, ducted fans
- F02B 77/13: Acoustic insulation
- B60K 1/00: Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00)
- B60K 11/06: with air cooling
- B60K 2001/003: {with means for cooling the electrical propulsion units}
- B60Y 2200/41: Construction vehicles, e.g. graders, excavators
- B60Y 2306/05: Cooling
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY

## Abstract

A construction machine in which an electrical unit can be reliably cooled at low cost by effectively utilizing an intake pipe connected to an intake port of an engine. This construction machine includes: an engine; and a hood covering the engine, wherein a space inside the hood has a placement space in which an electrical unit is placed and which communicates with outside air, and a distal-end opening of an intake pipe connected to an inlet port of the engine is disposed in the placement space to cause outside air sucked into the intake pipe due to a suction pressure occurred in the intake pipe to pass through the placement space to form a cooling air path in the placement space.

## Claims

### Claim 1

A construction machine comprising:
an engine;
a hood covering the engine;
a space inside the hood including a placement space which communicates with outside air;
a distal-end opening of an intake pipe connected to an inlet port of the engine disposed in the placement space;
an intake duct having an outside-air inlet port through which outside air is drawn disposed in the placement space; and
a communication port disposed downward of the outside-air inlet port disposed in the placement space, the distal-end opening of the intake pipe disposed upward of the communication port.

### Claim 2 (depends on 1)

The construction machine of claim 1, wherein the outside-air inlet port is disposed upward of the communication port.

### Claim 3 (depends on 2)

The construction machine of claim 2, wherein an electrical unit is positioned in the placement space, the electrical unit disposed upward of the communication port and downward of the distal-end opening of an intake pipe.