# US 2014/0196975 A1 · Hydraulic excavator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196975 A1 - Document ID: US20140196975A1 - Status: Published application - Kind: A1 - Application number: 14/118,409 - Filed: 2012-11-20 - Published: 2014-07-17 - Earliest claimed: 2012-10-16 - Assignees: Komatsu Ltd. - Applicants: Komatsu Ltd. - Inventors: Takanori Hata; Hiroshi Yamashita; Kazuyoshi Morimoto; Huzhe Yang; Gary Ryan - Web page: https://patentgrep.com/patent/US20140196975A1 ## CPC - E02F 9/0866: {Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment} - E02F 9/0883: {Tanks, e.g. oil tank, urea tank, fuel tank (for vehicles in general B60K15/00)} - E02F 9/18: Counterweights {(for cranes B66C23/72, for tractors B62D49/085)} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 13/1822: {for fixing exhaust pipes or devices to vehicle body} - F01N 2340/04: Arrangement of the exhaust system relative to a vehicle or parts thereof - F01N 2590/08: for heavy duty applications, e.g. trucks, buses, tractors, locomotives - F01N 2610/02: the substance being ammonia or urea - F01N 2610/14: Arrangements for the supply of substances, e.g. conduits - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02T 10/12: Improving ICE efficiencies - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust processing unit includes a selective catalytic reduction apparatus which processes exhaust from an engine. A reducing agent injection apparatus is attached to the exhaust processing unit. The reducing agent injection apparatus injects a reducing agent which is supplied to the selective catalytic reduction apparatus. The reducing agent tank and the reducing agent supply pump are arranged outside the engine compartment. The reducing agent tank retains the reducing agent. The reducing agent supply pump supplies the reducing agent from the reducing agent tank to the reducing agent injection apparatus. The reducing agent pipe connects the reducing agent supply pump and the reducing agent injection apparatus. The revolving frame includes a pipe frame. The reducing agent pipe is arranged from the reducing agent supply pump to the reducing agent injection apparatus so as to pass through the inner space of the pipe frame. ## Claims ### Claim 1 A hydraulic excavator comprising: an engine; a revolving frame supporting the engine; an engine compartment accommodating the engine; an exhaust processing unit arranged inside the engine compartment, the exhaust processing unit including a selective catalytic reduction apparatus configured to process exhaust from the engine; a reducing agent injection apparatus attached to the exhaust processing unit, the reducing agent injection apparatus being configured to inject a reducing agent supplied to the selective catalytic reduction apparatus; a reducing agent tank configured to retain the reducing agent, the reducing agent tank being arranged outside the engine compartment; a reducing agent supply pump arranged outside the engine compartment, the reducing agent supply pump being configured to supply the reducing agent from the reducing agent tank to the reducing agent injection apparatus; and a reducing agent pipe connecting the reducing agent supply pump and the reducing agent injection apparatus, wherein the revolving frame includes a pipe frame, and the reducing agent pipe is arranged from the reducing agent supply pump to the reducing agent injection apparatus so as to pass through an inner space of the pipe frame. ### Claim 2 (depends on 1) The hydraulic excavator according to claim 1, further comprising a vehicle body frame erected on the revolving frame, the vehicle body frame including a plurality of column members, wherein the exhaust processing unit is supported by the vehicle body frame, and the reducing agent pipe is arranged so as to pass through the inner space of the pipe frame and an inner space of one of the column members of the vehicle body frame. ### Claim 3 (depends on 2) The hydraulic excavator according to claim 2, wherein the plurality of column members includes a first column member extending upward from the revolving frame toward the exhaust processing unit, and the reducing agent pipe is arranged so as to pass through the inner space of the pipe frame and an inner space of the first column member. ### Claim 4 (depends on 2) The hydraulic excavator according to claim 2, wherein the plurality of column members includes a second column member arranged outside of the exhaust processing unit in a vehicle width direction, and the reducing agent pipe is arranged so as to pass through the inner space of the pipe frame and an inner space of the second column member. ### Claim 5 (depends on 4) The hydraulic excavator according to claim 4, further comprising an outer cover, wherein the outer cover is attached to the second column member. ### Claim 6 (depends on 1) The hydraulic excavator according to claim 1, wherein the revolving frame includes a center frame arranged below the engine, and the pipe frame is arranged outside of the center frame in a vehicle width direction. ### Claim 7 (depends on 1) The hydraulic excavator according to claim 1, wherein the pipe frame is arranged furthest to the outside of the revolving frame in a vehicle width direction. ### Claim 8 (depends on 1) The hydraulic excavator according to claim 1, wherein the pipe frame extends in a vehicle front and back direction. ### Claim 9 (depends on 1) The hydraulic excavator according to claim 1, further comprising a fuel tank configured to retain fuel, wherein the fuel tank is arranged between the reducing agent supply pump and the engine compartment. ### Claim 10 (depends on 1) The hydraulic excavator according to claim 1, further comprising a hydraulic fluid tank configured to retain hydraulic fluid, wherein the hydraulic fluid tank is arranged between the reducing agent supply pump and the engine compartment. ### Claim 11 (depends on 2) The hydraulic excavator according to claim 2, further comprising a counterweight arranged adjacent to the engine compartment, wherein the one of the column members through which the reducing agent pipe passes covers at least a counterweight side of the reducing agent pipe. ### Claim 12 (depends on 2) The hydraulic excavator according to claim 2, wherein the exhaust processing unit further includes: a diesel particulate filter apparatus configured to process exhaust from the engine; and a connecting pipe connecting the diesel particulate filter apparatus and the selective catalytic reduction apparatus, and the reducing agent injection apparatus is attached to the connecting pipe and configured to inject the reducing agent into the connecting pipe.