Construction machine

• US 9,016,418 B2
• Filed: 11/06/2012
• Issued: 04/28/2015
• Est. Priority Date: 11/11/2011
• Status: Active Grant

• Current Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Inventors: Ueki, Tsuyoshi, Ootsuka, Kakurou, Hiramatsu, Hidefumi
• Primary Examiner(s): TO, TOAN C
• Application Number:
  US14/342,835
• Publication Number:
  US 20140186151A1
• Time in Patent Office: 903 Days
• Field of Search: 180/89.1, 180/89.12, 180/324, 180/331, 172/82, 701/50
• US Class Current: 180/89.1
• CPC Class Codes: E02F 9/08 Superstructures; Supports for superstructures arrangements for travelling gear, e.g. undercarriages for wheels, crawlers, caterpillars E02F9/02; for motor vehicles B62D25/00, B62D33/00
• CPC Class Codes: E02F 9/0808 Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures for disposition of specific components, E02F9/0858
• CPC Class Codes: E02F 9/0833 Improving access, e.g. for maintenance, steps for improving driver's access, handrails
• CPC Class Codes: E02F 9/0875 Arrangement of valve arrangements on superstructures arrangement of hydraulic hoses E02F9/2275 takes precedence; valves per se E02F9/2267
• CPC Class Codes: E02F 9/0883 Tanks, e.g. oil tank, urea tank, fuel tank for vehicles in general B60K15/00
• CPC Class Codes: E02F 9/0891 Lids or bonnets or doors or details thereof doors for cabins E02F9/163 takes precedence; for motor vehicles B62D25/10
• CPC Class Codes: E02F 9/2267 Valves or distributors position of valves arrangements on upper-structures E02F9/0875
• CPC Class Codes: E02F 9/2282 Systems using center bypass type changeover valves
• CPC Class Codes: E02F 9/2285 Pilot-operated systems
• CPC Class Codes: E02F 9/2292 Systems with two or more pumps
• CPC Class Codes: E02F 9/2296 Systems with a variable displacement pump

Abstract

A right front housing cover is arranged in the right side of a working mechanism, and a first control valve is arranged in a front portion side of a valve accommodation room that is covered with the right front housing cover. Further, a signal control valve block is arranged in the back side of the first control valve and in the upper side of the first control valve, and a solenoid valve is arranged in the back side of the signal control valve block. A front surface plate forming part of the right front housing cover has a lower side is inclined in an oblique downward direction toward the forward side, and is arranged along a virtual line that extends in an oblique downward direction through a front end portion of the first control valve and a front end portion of the signal control valve block.

Claims

1. A construction machine comprising:

an automotive vehicle body (2, 3);

a working mechanism (4) that is tiltably provided in a front portion side of said vehicle body (3);

a cab (13) that is positioned in the left side of said working mechanism (4) and is provided in a front portion side in said vehicle body (3) to define an operator'"'"'s room;

a right front housing cover (17) that is positioned in the right side of said working mechanism (4) and is provided in a front portion side in said vehicle body (3) and within which a valve accommodation room (18) is formed;

a hydraulic pump (37, 39) that is mounted on said vehicle body (3) to deliver pressurized oil toward a plurality of hydraulic actuators; and

an operation device (42) that is provided in said cab (13) to be operated by an operator for driving said respective hydraulic actuators, wherein

a first control valve (21) that is configured of a collector of a plurality of directional control valves (24, 25, 26, 27, 28, 29) to control a flowing direction of the pressurized oil to be supplied to said respective hydraulic actuators from said hydraulic pump (37, 39), a second control valve (34) that outputs an operation signal output to said directional control valves (24, 25, 26, 27, 28, 29) of said first control valve (21) from said operation device (42), and a third control valve (35) that controls hydraulic equipment including said hydraulic actuator and said hydraulic pump (37, 39), are provided in said right front housing cover (17), characterized in that;

said first control valve (21) is arranged in a front portion side in said valve accommodation room (18),

said second control valve (34) is arranged in the back side of said first control valve (21) and in the upper side of said first control valve (21),

said third control valve (35) is arranged in the back side of said second control valve (34), and

said right front housing cover (17) is provided along a virtual line (B-B) extending in an oblique downward direction through a front end (22B) of said first control valve (21) and a front end (34C) of said second control valve (34).

2. The construction machine according to claim 1, wherein

said right front housing cover (17) comprises:

a left side plate (17A) and a right side plate (17B) that cover said valve accommodation room (18) from the left side and right side; and

a front surface plate (17C) that covers said valve accommodation room (18) from upward and forward, wherein

said front surface plate (17C) is formed in a polygonal shape projecting as a whole, and is provided with a lower side inclined surface portion (17C4) at a halfway section to be inclined in an oblique downward direction toward the forward side, and

said lower side inclined surface portion (17C4) is configured to be substantially in parallel with said virtual line (B-B).

3. The construction machine according to claim 1, wherein

said second control valve (34) is arranged in a stepwise manner in the upper side of said first control valve (21) in a state of overlapping a rear portion side in said first control valve (21) in the upper-lower direction.

4. The construction machine according to claim 1, wherein

a vehicle body frame (5) that is a base of said vehicle body (3) comprises:

a center frame (6) including a bottom plate (6A), and left and right vertical plates (6B, 6C) that are provided to rise on said bottom plate (6A) and extend in the front-rear direction; and

a left side frame (7) and a right side frame (8) that are arranged in the left side and right side of said center frame (6),

a boom foot portion (4A) of said working mechanism (4) is rotatably mounted to said left and right vertical plates (6B, 6C) of said center frame (6) through a boom foot pin (9), and

said first control valve (21) and said second control valve (34) are arranged in the front side of an axis line (A-A) of said boom foot pin (9).

5. The construction machine according to claim 4, wherein

a pin inserting/removing space (36) is provided between a right side plate (17B) of said right front housing cover (17) and said right vertical plate (6C) of said center frame (6) to be positioned in the lower side of said third control valve (35) for inserting/removing said boom foot pin (9) in/from said left and right vertical plates (6B, 6C).

6. The construction machine according to claim 1, wherein

a bracket (30) is provided in said first control valve (21) to project from the rear portion side to the upward side, wherein said second control valve (34) and said third control valve (35) are removably mounted on said bracket (30).

7. The construction machine according to claim 1, wherein

a fuel tank (16) is positioned in the back side of said right front housing cover (17) at the right side of said vehicle body (3) to form a rear surface of said valve accommodation room (18), and

said right front housing cover (17) is provided with a step (19) which is a foothold for getting on said vehicle body (3).