Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1998-06-04
2000-01-04
Ryznic, John E.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60489, 91457, F02B 2702
Patent
active
060097086
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a control apparatus for a construction machine such as a hydraulic shovel, and more particularly to a control apparatus for a construction machine constructed so as to achieve effective utilization of energy.
BACKGROUND ART
Generally, a construction machine (working machine) such as a hydraulic shovel and so on is composed of, as shown in FIG. 3, an upper revolving unit 102, a lower traveling unit 100 and a working apparatus 118.
The lower traveling unit 100 includes a right track 100R and a left track 100L which can be driven independently of each other. Meanwhile, the upper revolving unit 102 is provided for revolving movement in a horizontal plane with respect to the lower traveling unit 100.
The working apparatus 118 is principally composed of a boom 103, a stick 104, a bucket 108 and so forth, and the boom 103 is mounted for pivotal motion with respect to the upper revolving unit 102. Further, the stick 104 is connected for pivotal motion similarly in a vertical plane to an end of the boom 103.
A boom driving hydraulic cylinder (boom cylinder) 105 for driving the boom 103 is provided between the upper revolving unit 102 and the boom 103, and a stick driving hydraulic cylinder (stick cylinder) 106 for driving the stick 104 is provided between the boom 103 and the stick 104. Further, a bucket driving hydraulic cylinder (bucket cylinder) 107 for driving the bucket 108 is provided between the stick 104 and the bucket 108.
By such a construction as described above, the boom 103 is constructed for pivotal motion in an a direction and a b direction in the figure and the stick 104 is constructed for pivotal motion in a c direction and a d direction in the figure, and the bucket cylinder 107 is constructed for pivotal motion in an e direction and an f direction in the figure.
FIG. 4 is a view schematically showing a construction of essential part of a hydraulic circuit of such a hydraulic shovel as described above. As shown in FIG. 4, traveling motors 109L and 109R as power sources which are independent of each other are provided for the left track 100L and the right track 100R described above, respectively, and a revolving motor 110 for driving the upper revolving unit 102 to revolve with respect to the lower traveling unit 100 is provided for the upper revolving unit 102.
The traveling motors 109L and 109R and revolving motor 110 mentioned above are constructed as hydraulic motors which are operated by a hydraulic pressure, and working oil of a predetermined hydraulic pressure is supplied to them through a hydraulic pump driven by an engine (principally by a Diesel engine) not shown or a hydraulic control circuit apparatus 111 shown in FIG. 4.
In response to a working oil pressure supplied in this manner, the hydraulic motors 109L, 109R and 110 are driven. Also the cylinders 105 to 107 are driven by the hydraulic pressure from the hydraulic pump driven by the engine not shown in a similar manner as described above.
An operator cab 101 includes, as operation members for controlling operation of the hydraulic shovel (traveling, revolving, pivotal motion of the boom, pivotal motion of the stick and pivotal motion of the bucket), a left lever 101B, a right lever 101C, a left pedal 101L, a right pedal 101R and so forth.
When, for example, an operator operates the lever 101B or 101C and/or the pedal 101L or 101R, the hydraulic control circuit apparatus 111 is controlled so that a suitable one or ones of the cylinders 105 to 107 and the hydraulic motor 109L, 109R and 110 are driven. As a result of the driving, the upper revolving unit 102 can be revolved, or the boom 103, stick 104, bucket 108 and so forth can be pivoted, or the hydraulic shovel can be driven to travel.
By the way, as shown in FIG. 4, the hydraulic control circuit apparatus 111 includes hydraulic control valves (main control valves) 111-1 to 111-6 for adjusting control amounts of the cylinders 105 to 107 and the hydraulic motors 109L, 109R and 110, respectively.
Here, all of the main control valves 111-
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Akaki Tomohiro
Miki Masatoshi
Mitsumori Shigeyoshi
Samejima Makoto
Yoshino Kazunori
Ryznic John E.
Shin Caterpillar Mitsubishi Ltd.
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