EP0849406A1 - Hydraulisches Antriebssystem für einen hydraulischen Bagger - Google Patents

Hydraulisches Antriebssystem für einen hydraulischen Bagger Download PDF

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Publication number
EP0849406A1
EP0849406A1 EP97120554A EP97120554A EP0849406A1 EP 0849406 A1 EP0849406 A1 EP 0849406A1 EP 97120554 A EP97120554 A EP 97120554A EP 97120554 A EP97120554 A EP 97120554A EP 0849406 A1 EP0849406 A1 EP 0849406A1
Authority
EP
European Patent Office
Prior art keywords
blade
operating means
boom
arm
bucket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97120554A
Other languages
English (en)
French (fr)
Other versions
EP0849406B1 (de
Inventor
Ei Takahashi
Kazunori Nakamura
Manabu Ogasawara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Publication of EP0849406A1 publication Critical patent/EP0849406A1/de
Application granted granted Critical
Publication of EP0849406B1 publication Critical patent/EP0849406B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
    • E02F3/325—Backhoes of the miniature type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2025—Particular purposes of control systems not otherwise provided for

Definitions

  • the present invention relates to a hydraulic drive system for a hydraulic excavator, and more particularly to a hydraulic drive system for a hydraulic excavator having a blade.
  • Conventional hydraulic excavators having blades include a hydraulic cylinder for vertically moving the blade, and a control lever for extending and contracting the blade hydraulic cylinder to vertically move the blade is provided independently of control levers for operating a work front.
  • the blade hydraulic cylinder When carrying out work using the blade, the blade hydraulic cylinder is extended to lower the blade down onto the ground. In other situations, the blade hydraulic cylinder is contracted to raise the blade from the ground surface.
  • Such an arrangement has however accompanied a problem that a space for installation of the control lever for vertically moving the blade is required separately and a space within a cab becomes narrow.
  • An object of the present invention is to provide a hydraulic drive system for a hydraulic excavator which enables a blade to be operated to move variously without narrowing a space in a cab and deteriorating operability of the blade.
  • Fig. 1 is a hydraulic circuit diagram showing a pilot system in a hydraulic drive system according to a first embodiment of the present invention.
  • Fig. 2 is a side view showing the entire structure of a hydraulic excavator to which the hydraulic drive system of Fig. 1 is applied.
  • Fig. 3 is a plan view showing the structure of a blade attaching portion of the hydraulic excavator shown in Fig. 2.
  • Fig. 4 is a hydraulic circuit diagram showing a typical portion other than the pilot system in the hydraulic drive system according to the first embodiment of the present invention.
  • Figs. 5A and 5B are each an illustration showing actuator operations capable of being achieved by multi-levers.
  • Fig. 6 is a view showing the structure of a changeover switch shown in Fig. 1.
  • Fig. 7 is a hydraulic circuit diagram showing a pilot system in a hydraulic drive system according to a second embodiment of the present invention.
  • Fig. 8 is a hydraulic circuit diagram showing a pilot system in a modification.
  • Figs. 9A and 9B are each an illustration showing actuator operations capable of being achieved by multi-levers in the modification.
  • Fig. 10 is a hydraulic circuit diagram showing a pilot system in a hydraulic drive system according to a third embodiment of the present invention.
  • a hydraulic drive system is applied to well-known hydraulic excavators having blades, e.g., a hydraulic excavator disclosed in JP, U, 1-98258.
  • Fig. 2 is a side view showing the entire structure of the hydraulic excavator
  • Fig. 3 is a plan view showing the structure of a blade attaching portion of the hydraulic excavator shown in Fig. 2.
  • the hydraulic excavator comprises a under traveling carriage 1, a blade 3 attached to the under traveling carriage 1 through a blade arm 2, an upper swing structure 4, and a work front 5 mounted onto the upper swing structure 4.
  • the work front 5 includes a boom 6 rotatably connected to the upper swing structure 4, an arm 8 rotatably connected to the boom 6, and a bucket 9 rotatably connected to the arm 8.
  • the under traveling carriage 1 includes a track frame 10 to which the blade arm 2 is attached movably in the vertical direction.
  • a bracket 11 is attached to a fore end of the blade arm 2 rotatably about an axis P lying in the vertical direction.
  • the blade 3 is attached to the bracket 11 through a ball bearing 12 rotatably about an axis O lying in the back-and-forth direction.
  • link members 13, 13 Between the bracket 11 and the blade 3, there are provided link members 13, 13 for coupling those two in an movable manner relative to each other.
  • ball bearings are installed in respective joint portions of the link members 13 to the blade 3 and the bracket 11.
  • a connecting frame 14 is provided to bridge two side beams of the blade arm 2.
  • a rod portion 15a of a blade-up/down cylinder 15 is rotatably coupled to the connecting frame 14, and a bottom portion 15b thereof is rotatably coupled to the track frame 10.
  • Rod portions 16aa, 16ba of blade-tilt cylinders 16a, 16b are rotatably coupled to the blade 3 at positions near both ends, and bottom portions 16ab, 16bb thereof are rotatably coupled to a central portion of the bracket 11.
  • the blade 3 can tilt in the direction to rise at the right side or in the direction to rise at the left side (as viewed from the operator) when the cylinder 16a is operated to extend and the cylinder 16b is operated to contract, or when the cylinder 16a is operated to contract and the cylinder 16b is operated to extend.
  • rod portions 18aa, 18ba of blade-angle cylinders 18a, 18b are rotatably coupled to both ends of the bracket 11, and bottom portions 18ab, 18bb thereof are rotatably coupled to the blade arm 2.
  • the blade 3 can be angled forward at the left end or at the right end (as viewed from the operator) when the cylinder 18a is operated to extend and the cylinder 18b is operated to contract, or when the cylinder 18a is operated to contract and the cylinder 18b is operated to extend.
  • Figs. 1 and 4 are each a hydraulic circuit diagram showing a hydraulic drive system of this embodiment equipped on the above-stated hydraulic excavator.
  • Fig. 1 shows the circuit of a pilot system and
  • Fig. 4 shows a typical portion of the circuit other than the pilot system.
  • the hydraulic circuit comprises a hydraulic pump 19 driven by an engine (not shown), a plurality of hydraulic actuators, including a boom cylinder 20 (see Fig. 2), an arm cylinder 21, a bucket cylinder 22 (see Fig. 2), a swing motor (not shown), left and right travel motors (not shown), the blade-up/down cylinder 15 (see Figs. 2), the blade-angle cylinders 18a and 18b, and the blade-tilt cylinders 16a, 16b (see Fig.
  • Fig. 1 shows only an arm control valve 28 and Fig. 4 shows a blade-angle control valve 29 in addition to the valve 28.
  • the above-mentioned components constitute the hydraulic drive system for driving driven members of the hydraulic excavator.
  • the work front 5, the upper swing structure 4, the under traveling carriage 1 and the blade 3, mentioned above, constitute the driven members of the hydraulic excavator to be driven by the corresponding hydraulic actuators 18, 21, etc., and their operations are instructed by the control lever units 23 - 26, etc.
  • the control lever units 23 - 26 are constructed of the so-called pilot operating units; namely, they are of hydraulic pilot type outputting pilot pressures as the operation signals and driving the corresponding control valves 28, 29, etc.
  • the control lever units 23 - 26 are constituted as a boom/blade-up/down control lever unit 23, an arm/blade-angle control lever unit 24, a bucket/blade-tilt control lever unit 25, and a swing control lever unit 26. As shown in Fig.
  • control lever units 23, 24, 25, 26 are made up of respectively control levers 23a, 24a, 25a, 26a manipulated by the operator, and pressure reducing valves 23b, 24b, 25b, 26b for producing pilot pressures depending on the input amounts by and the directions in which the control levers 23a, 24a, 25a, 26a are manipulated.
  • the pressure reducing valves 23b, 24b, 25b, 26b are connected at the primary port side to a hydraulic source 48 (e.g., a pilot pump driven by the engine), and at the secondary port side to hydraulic driving sectors 28a, 28b; 29a, 29b, etc. of the corresponding control valves 28, 29, etc. through pilot lines 30, 31, 32, 33, 34, 35, 36, 38.
  • a hydraulic source 48 e.g., a pilot pump driven by the engine
  • the pilot lines 30 - 38 are constituted as a boom-up/blade-up pilot line 30, a boom-down/blade-down pilot line 31, an arm dumping/blade left-angling pilot line 32, an arm crowding/blade right-angling pilot line 33, a bucket crowding/blade right-rising tilt pilot line 34, a bucket dumping/blade left-rising tilt pilot line 35, a left swing pilot line 36, and a right swing pilot line 38.
  • pilot lines 30, 31, 32, 33, 34, 35 are each branched at the downstream side into two lines 30a, 30b; 31a, 31b; 32a, 32b; 33a, 33b; 34a, 34b; and 35a, 35b, respectively, and switching valves 39, 40, 41, 42, 43, 44 are provided at the respective branched points.
  • the switching valves 39 - 44 are each shifted by a hydraulic pressure introduced thereto from the hydraulic source 48 through a solenoid switching valve 46 which is driven in response to a signal from a changeover switch 45. Specifically, when the changeover switch 45 is turned to a "front side" position, no drive signal is output and the solenoid switching valve 46 is shifted to an upper position in Fig. 1 by action of a restoring spring 46a. Therefore, the pilot pressure from the hydraulic source 48 is not introduced to the switching valves 39 - 44 and the switching valves 39 - 44 are held in upper positions in Fig.
  • the upstream portions 30c - 38c of the pilot lines 30 - 38 are connected respectively to the boom-up pilot line 30a, the boom-down pilot line 31a, the arm dumping pilot line 32a, the arm crowding pilot line 33a, the bucket crowding pilot line 34a, and the bucket dumping pilot line 35a.
  • the pilot pressure is introduced to the driving sectors of the control valve 28, etc. for driving the hydraulic actuators 20, 21, etc. of the work front 5.
  • control levers 23a - 26a of the control lever units 23 - 26 are constructed as so-called multi-levers 49; i.e., the control levers 23a and 24a are constructed as one multi-lever, and the control levers 25a and 26a are constructed as the other multi-lever.
  • multi-levers 49 i.e., the control levers 23a and 24a are constructed as one multi-lever, and the control levers 25a and 26a are constructed as the other multi-lever.
  • two actuators can be operated by manipulating one lever.
  • the operations instructed by the control levers are shown in Figs. 5A and 5B.
  • Fig. 5A shows one example set of actuator operations capable of being achieved by the multi-levers when the changeover switch 45 is in the "front side" position.
  • the drawing is illustrated corresponding to the operating direction viewed from the operator in a cab 50; i.e., the vertical direction in the drawing corresponds to the back-and-forth direction in the cab 50 and the left-and-right direction in the drawing corresponds to the left-and-right direction in the cab 50.
  • two multi-levers 49L, 49R are provided one on each of left and right sides of an operator's seat 51.
  • the right-hand lever 49R serves as a lever for operating the boom and bucket
  • the left-hand lever 49L serves as a lever for operating the arm and swinging the upper swing structure.
  • the boom 6 is moved up and down, and when it is operated in the left-and-right direction, the bucket 9 is crowded and dumped.
  • the right-hand lever 49R is pulled rearward leftward, for example, the combined operation of boom-up and bucket crowding can be performed.
  • the left-hand lever 49L when the left-hand lever 49L is operated in the back-and-forth direction, the upper swing structure 4 is swinged to the left and right, and when it is operated in the left-and-right direction, the arm 8 is dumped and crowded.
  • the left-hand lever 49L is pulled rearward rightward, for example, the combined operation of left swing and arm crowding can be performed.
  • Fig. 5B shows one example set of actuator operations capable of being achieved by the multi-levers 49L, 49R when the changeover switch 45 is in the "blade side" position.
  • the drawing is illustrated corresponding to the operating direction viewed from the operator in the cab 50.
  • the right-hand lever 49R is a lever for tilting and moving the blade up and down
  • the left-hand lever 49L is a lever for angling the blade and swinging the upper swing structure.
  • the blade 3 is moved up and down, and when it is operated in the left-and-right direction, the blade 3 is tilted to rise at the right side and the left side.
  • the blade When the right-hand lever 49R is pulled rearward leftward, for example, the blade can be tilted to rise at the right side while moving up. Further, when the left-hand lever 49L is operated in the left-and-right direction, the blade 3 is angled forward at the left end and the right end. Incidentally, when the left-hand lever 49L is operated in the back-and-forth direction, the upper swing structure 4 is swinged to the left and right as with the case of Fig. 5A.
  • the control lever units for operating the left and right travel motors have travel control levers 47L, 47R (see Fig. 2) which are provided in more front positions than the multi-levers 49L, 49R with respect to the operator's seat 51.
  • the changeover switch 45 for shifting the switching valves 39 - 44 is disposed on one of the travel control levers 47L, 47R, as shown in Fig. 6. This arrangement of the changeover switch 45 improves operability in shifting the switching valves 39 - 44.
  • the control lever unit 23, the upstream portions 30c, 31c and the blade-up/down pilot lines 30b, 31b of the pilot lines 30, 31, the blade-up/down control valve (not shown), and the blade-up/down cylinder 15 jointly constitute up/down operating means for moving the blade 3 up and down.
  • the control lever unit 24, the upstream portions 32c, 33c and the blade left-angling/-right-angling pilot lines 32b, 33b of the pilot lines 32, 33, the angle control valve 29, and the angle cylinder 18 jointly constitute angle operating means for angling the blade 3.
  • the hydraulic drive system of this embodiment having the above-explained construction, can provide advantages as follows.
  • the control lever units 23 - 26 and the upstream portions 30c - 35c of the pilot lines 30 - 35 are constructed to be shared by both the case of operating the work front 5 and the upper swing structure 4 and the case of operating the blade 3.
  • the switching valves 39 - 44 are shifted to the upper positions in Fig. 1 so that the shared section is used for operating the work front 5 and the upper swing structure 4.
  • the switching valves 39 - 44 are shifted to the lower positions in Fig. 1 so that the shared section is used for operating the blade 3.
  • changeover switch 45 is provided on one of the travel control levers 47L, 47R in the above embodiment, the present invention is not limited to the illustrated embodiment, and the changeover switch 45 may be provided on one of the multi-levers 49L, 49R.
  • FIG. 7 A second embodiment of the present invention will be described below with reference to Fig. 7. This embodiment differs from the above first embodiment in structure of the switching valves and manner of shifting the switching valves. Equivalent members to those in the first embodiment are denoted by the same reference numerals and are not explained here.
  • Fig. 7 is a hydraulic circuit diagram showing a circuit of a pilot system in a hydraulic drive system of this second embodiment, and corresponds to Fig. 1 for the first embodiment.
  • this embodiment particularly differs from the above first embodiment in that solenoid switching valves 201a - 201c are provided instead of the switching valves 39 - 44 and shifted independently of one another in response to signals output from three changeover switches 202a - 202c each of which is the same as the changeover switch 45 in the first embodiment.
  • changeover switches 202a - 202c are provided on a console (not shown) within the cab 50 unlike the changeover switch 45 in the first embodiment.
  • the other structure is basically the same as in the first embodiment.
  • the changeover switch 202a and the solenoid switching valve 201a constitute arm switching means for selectively connecting the arm shared section such that the arm shared section serves as part of the arm operating means when the arm 8 is operated.
  • the changeover switch 202b and the solenoid switching valve 201b constitute boom switching means for selectively connecting the boom shared section such that the boom shared section serves as part of the boom operating means when the boom 6 is operated.
  • the changeover switch 202c and the solenoid switching valve 201c constitute bucket switching means for selectively connecting the bucket shared section such that the bucket shared section serves as part of the bucket operating means when the bucket 9 is operated.
  • this second embodiment constructed as explained above can provide an advantage below. Since switching over between the boom-up/down operation and the blade-up/down operation, switching over between the arm dumping/crowding operation and the blade left/right-angling operation, and switching over between the bucket dumping/crowding operation and the blade left/right-rising tilt operation are performed independently of one another, the switching can be more finely depending on desired types of work.
  • the boom-up operation and the blade-up operation, the boom-down operation and the blade-down operation, the arm dumping operation and the blade left-angling operation, the arm crowding operation and the blade right-angling operation, the bucket dumping operation and the blade left-rising tilt operation, and the bucket crowding operation and the blade right-rising tilt operation are related to each other in such a manner as being able to switch over between two types of operations in each pair.
  • the present invention is not limited to those combinations and the combined pairs of operations may be changed appropriately depending on applications of the hydraulic excavator. Irrespective of change in combination, the same advantages as in the above embodiments can be provided.
  • the combined pairs of operations may be modified below, by way of example, for a particular object. A hydraulic drive system according to this modification will be described with reference to Figs. 8, 9A and 9B.
  • Fig. 8 is a hydraulic circuit diagram of a pilot system of the hydraulic drive system and corresponds to Fig. 7 for the second embodiment.
  • this modification differs from the second embodiment in that the boom-up/down and the bucket crowding/dumping are exchanged in the above combinations of operations; i.e., the bucket crowding operation and the blade-up operation, the bucket dumping operation and the blade-down operation, the boom-down operation and the blade left-rising tilt operation, and the boom-up operation and the blade right-rising tilt operation are related to each other in such a manner as being able to switch over between two types of operations in each pair.
  • Resulting relationships between the operating directions of the multi-levers 49L, 49R and the types of operations instructed by the multi-levers are shown in Figs. 9A and 9B.
  • Fig. 9A shows the actuator operations capable of being achieved by the multi-levers 49L, 49R when the changeover switches 202a - 202c are all in the "front side” positions, and corresponds to Fig. 5A for the first embodiment.
  • the boom-up/down and the bucket crowding/dumping are exchanged such that when the right-hand lever 49R is operated in the back-and-forth direction, the bucket 9 is crowded and dumped, and when it is operated in the left-and-right direction, the boom 6 is moved up and down.
  • This modification has an advantage below.
  • a pair of operations to be exchanged is not limited to the above pair.
  • the boom 6 can be always operated by the control lever 26a irrespective of any switching valves 202, and the left/-right swing operation and the blade-up/down operation can be selectively performed by the control lever unit 23 upon the changeover switch 202b turned to the "front side" or "blade side” position.
  • FIG. 10 A third embodiment of the present invention will be described with reference to Fig. 10.
  • This embodiment employs control lever units equipped with the so-called electrical levers. Equivalent members to those in the first and second embodiments are denoted by the same reference numerals and are not explained here.
  • Fig. 10 is a hydraulic circuit diagram showing a circuit of a pilot system in a hydraulic drive system of this third embodiment.
  • this embodiment particularly differs from the above first embodiment in that control lever units 301 - 308 equipped with control levers 301a - 308a are provided instead of the control lever units 23 - 26, and a controller 309 for receiving operations signals from the control lever units 301 - 308 and solenoid pressure reducing valves 310 - 317 for reducing the pressure of the hydraulic fluid from the hydraulic source 48 in accordance with output signals from the controller 309 are provided additionally.
  • control lever units 301 - 308 are constituted as a left swing control lever unit 301, a right swing control lever unit 302, a bucket crowding/blade right-rising tilt control lever unit 303, a bucket dumping/blade left-rising tilt control lever unit 304, a boom-up/blade-up control lever unit 305, a boom-down/-blade-down control lever unit 306, an arm dumping/blade left-angling control lever unit 307, and an arm crowding/blade right-angling control lever unit 308.
  • control lever units 301 - 308 include respective potentiometers 301b - 308b for detecting shift positions of the control levers 301a - 308a and then outputting corresponding electrical signals.
  • the controller 309 executes predetermined arithmetic operations and outputs drive signals to the corresponding solenoid pressure reducing valves 310 - 317.
  • the solenoid pressure reducing valves 310 - 317 are connected at the primary side to the hydraulic source 48, and at the secondary side to the corresponding pilot lines 30 - 38.
  • control lever units 301 - 308 are constructed of two multi-levers 49L, 49R so that the actuator operations shown in Figs. 5A and 5B can be selectively performed upon the changeover switch 45 turned to the "front side” or "blade side” position.
  • the subsequent process is the same as in the first embodiment.
  • a drive signal corresponding to the lever input amount is output from the controller 309 to the solenoid pressure reducing valve 317.
  • the original pilot pressure is changed to a pressure proportional to the lever input amount and then output to the upstream portion 33c of the pilot line 33.
  • the subsequent process is the same as in the first embodiment. Further, when the operator returns the left-hand lever 49L shown in Fig.
  • a corresponding drive signal is output from the controller 309 to the solenoid pressure reducing valves 316, 317, whereupon the solenoid pressure reducing valves 316, 317 connect the upstream portions 32c, 33c of the pilot lines 32, 33 to the reservoir 52.
  • the subsequent process is the same as in the first embodiment.
  • the boom-up/down operation, the bucket dumping/crowding operation, and the left/right swing operation can also be performed in a similar manner.
  • the changeover switch 45 When operating the blade 3, the changeover switch 45 is turned to the "blade side" position for shifting the switching valves 39 - 44 to the lower positions in Fig. 10 and the control levers 303 - 308 are manipulated corresponding to the desired type of work.
  • Flows of signals and pilot pressures in the case of operating the blade 3 are basically the same as in the above case of operating the work front, and hence are not explained here.
  • This third embodiment can also provide the same advantages as in the first embodiment.
  • the multi-levers 49L, 49R are assigned with the respective actuator operations for each of the operating directions, as shown in Figs. 5A and 5B, but assignment of the actuator operations to the multi-levers for each of the operating directions is not limited to the illustrated example.
  • the left-hand lever 49L may serve as a lever for operating the boom and the bucket
  • the right-hand lever 49R may serve as a lever for operating the arm and swinging the upper swing structure.
  • the left-hand lever 49L may serve as a lever for operating the boom and swinging the upper swing structure
  • the right-hand lever 49R may serve as a lever for operating the arm and the bucket. Any of those cases can also provide the same advantages as in the above embodiments.
  • the need of securing the space for installation of the second operating means separately from the space for installation of the first operating means is eliminated with regard to the shared section, and hence the space in the cab is avoided from becoming narrow.
  • the shared section of the first operating means which is determined beforehand in consideration of operability, is used as it is as part of the second operating means.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
EP97120554A 1996-12-20 1997-11-24 Hydraulisches Antriebssystem für einen hydraulischen Bagger Expired - Lifetime EP0849406B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP8341270A JPH10183676A (ja) 1996-12-20 1996-12-20 油圧ショベルの油圧駆動装置
JP341270/96 1996-12-20
JP34127096 1996-12-20

Publications (2)

Publication Number Publication Date
EP0849406A1 true EP0849406A1 (de) 1998-06-24
EP0849406B1 EP0849406B1 (de) 2002-06-05

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EP97120554A Expired - Lifetime EP0849406B1 (de) 1996-12-20 1997-11-24 Hydraulisches Antriebssystem für einen hydraulischen Bagger

Country Status (5)

Country Link
EP (1) EP0849406B1 (de)
JP (1) JPH10183676A (de)
KR (1) KR100221808B1 (de)
CN (1) CN1074807C (de)
DE (1) DE69713043T2 (de)

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EP1365076A1 (de) * 2002-05-23 2003-11-26 Komatsu Ltd. Hydraulikkreis für Zusatzarbeitseinrichtungen
EP1367182A1 (de) * 2002-05-30 2003-12-03 Groupe Mecalac Elektrohydraulische Vorrichtung und damit ausgerüstete Baumaschine
GB2412362A (en) * 2002-08-22 2005-09-28 Caterpillar Inc Method for a work machine having more than one function
GB2392147B (en) * 2002-08-22 2006-01-04 Caterpillar Inc Operator control station and method for a backhoe loader having more than one function
WO2010054155A2 (en) 2008-11-06 2010-05-14 Purdue Research Foundation System and method for pump-controlled cylinder cushioning
WO2010054152A3 (en) * 2008-11-06 2010-07-29 Purdue Research Foundation System and method for blade level control of earthmoving machines
US9840283B2 (en) 2016-02-23 2017-12-12 Caterpillar Inc. Machine frame

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CN101918647B (zh) * 2007-08-13 2013-06-12 克拉克设备公司 用于旋转施工机械的液压控制系统
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CN106907375B (zh) * 2017-03-30 2018-09-21 中建八局第一建设有限公司 一种有效控制土方开挖精度的挖斗装置

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EP1367182A1 (de) * 2002-05-30 2003-12-03 Groupe Mecalac Elektrohydraulische Vorrichtung und damit ausgerüstete Baumaschine
FR2840368A1 (fr) * 2002-05-30 2003-12-05 Groupe Mecalac Dispositif electro-hydraulique et engin de travaux publics ainsi equipe
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WO2010054155A3 (en) * 2008-11-06 2010-07-15 Purdue Research Foundation System and method for pump-controlled cylinder cushioning
WO2010054152A3 (en) * 2008-11-06 2010-07-29 Purdue Research Foundation System and method for blade level control of earthmoving machines
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DE69713043D1 (de) 2002-07-11
DE69713043T2 (de) 2003-02-06
KR19980063464A (ko) 1998-10-07
CN1074807C (zh) 2001-11-14
CN1185507A (zh) 1998-06-24
EP0849406B1 (de) 2002-06-05
KR100221808B1 (ko) 1999-09-15
JPH10183676A (ja) 1998-07-14

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