EP2636910B1 - Hydraulic drive device for construction machine - Google Patents
Hydraulic drive device for construction machine Download PDFInfo
- Publication number
- EP2636910B1 EP2636910B1 EP11837981.7A EP11837981A EP2636910B1 EP 2636910 B1 EP2636910 B1 EP 2636910B1 EP 11837981 A EP11837981 A EP 11837981A EP 2636910 B1 EP2636910 B1 EP 2636910B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- oil
- pressure
- filter
- oil passage
- 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.)
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Links
- 238000010276 construction Methods 0.000 title description 5
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
-
- 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
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- 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
-
- 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
- E02F9/225—Control of steering, e.g. for hydraulic motors driving the vehicle tracks
-
- 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
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
Definitions
- This invention relates to a hydraulic drive system for a working machine such as a wheel excavator, which is to be arranged on the working machine and is provided with a filter for trapping dust mixed in oil flowing through an oil passage.
- a hydraulic drive system as described in the preamble portion of the single claim has been known from DE 3237019 A1 .
- JP-A-6-35607 U As a conventional technology of this type, there is one described in JP-A-6-35607 U .
- the conventional technology disclosed therein is provided with a filter and a check valve .
- the filter is arranged in an upstream oil passage of a hydraulic circuit to which pressure oil delivered from a hydraulic pump is fed, and traps dust mixed in oil delivered from the hydraulic pump.
- the check valve is arranged in the oil passage such that the check valve is disposed in parallel with the filter, and allows a flow of oil from a side of the hydraulic pump to a side of the hydraulic circuit but prevents a flow of oil from the side of the hydraulic circuit to the side of the hydraulic pump.
- the filter is arranged on the upstream side relative to the hydraulic pump in the above-mentioned conventional technology
- a technology with a filter arranged in a hydraulic circuit on a downstream side relative to a hydraulic pump has also been known conventionally. Described specifically, it has also been known for years to arrange a valve device and a relief valve, which specifies a maximum of switching pressure for the valve device, in a hydraulic circuit on a downstream side of a hydraulic pump, and in an oil passage communicating the valve device and the relief valve to each other, to arrange a filter for trapping dust that flows through the oil passage.
- the technology constructed as described above can realize the cleaning of oil that flows through the oil circuit on the downstream side of the hydraulic pump.
- DE 3237019 A1 discloses a hydraulic drive system for a working machine, said system being provided with a hydraulic pump, an on/off valve switchable according to pressure oil delivered from the hydraulic pump, a relief valve specifying a maximum of switching pressure for the on/off valve, a filter arranged in an oil passage communicating the on/off valve and the relief valve to each other, and a check valve arranged in the oil passage and in parallel with the filter such that a flow of oil from a side of the on/off valve toward a side of the relief valve is allowed but a flow of oil from the side of the relief valve toward the side of the on/off valve is prevented.
- a relief valve is arranged between the valve device and the filter to release a high pressure when the pressure in the oil passage section, which communicates the valve device and the filter to each other, rises to the high pressure.
- a relief valve is generally expensive. The construction with a relief valve arranged as described above, therefore, involves an inconvenience that the hydraulic drive system requires higher manufacturing cost.
- the present invention has as an object thereof the provision of a hydraulic drive system for a working machine, which can guide oil of a high pressure in an oil passage section, which communicates a valve device and a filter to each other, to the relief valve by a relatively inexpensive structure even when clogging occurs in a filter arranged in an oil passage communicating the valve device and the relief valve to each other.
- the check valve is arranged in the above-mentioned oil passage and in parallel with the filter to allow a flow of oil from the side of the valve device toward the side of the relief valve but to prevent a flow of oil from the side of the relief valve toward the side of the valve device.
- the working machine on which the hydraulic drive system according to this embodiment can be arranged is, for example, a wheel excavator.
- this wheel excavator is provided with a travel base 1 having front wheels 2 and rear wheels 3, an upperstructure 4 mounted on the travel base 1, and working equipment 5 attached tiltably in an up-and-down direction to the upperstructure 4.
- the working equipment 5 includes a boom 6 tiltably arranged on the upperstructure 4, an arm 7 tiltably arranged on a free end of the boom 6, and a bucket 8 tiltably arranged on a free end of the arm 7.
- An operator's cab 9 is arranged on the upperstructure 4 at a forward position thereof, and a counterweight 10 is arranged on the upperstructure 4 at a rear position thereof.
- An engine compartment 11 is arranged between the operator's cab 9 and the counterweight 11, and a main part of the hydraulic drive system according to this embodiment is accommodated in the engine compartment 11.
- the hydraulic drive system is provided with a hydraulic pump 20, a priority valve 21 communicated to the hydraulic pump 20, and a steering valve 22 arranged in continuation with the priority valve 21 to feed pressure oil to an unillustrated steering cylinder according to an operation of an unillustrated steering wheel.
- a brake valve 23 for feeding pressure oil which applies a brake on the front wheels 2 and rear wheels 3, to an unillustrated brake system according to a depression operation of a brake pedal 23a arranged in the operator's cab 9, accumulators 24 arranged in a pair, one for the front wheels 2 and the other for the rear wheels 3, to accumulate pressure oil to be fed to the brake valve 23, and a charge valve 25 communicated to the above-mentioned priority valve 21 via an oil passage 26 to permit feeding pressure oil to the accumulators 24.
- a filter 28 and a check valve 29 are arranged in parallel with each other.
- the filter 28 traps dust mixed in pressure oil that flows through the oil passage 38.
- the check valve 29 allows a flow of pressure oil from a side of the hydraulic pump 20 toward a side of the priority valve 21, but prevents a flow of pressure oil from the side of the priority valve 21 toward the side of the hydraulic pump 20.
- the above-mentioned priority valve 21 includes a directional control valve 21a and a relief valve 21b.
- the directional control valve 21a has a neutral position 21a1, which is a switched position where pressure oil can be fed to the accumulators 24, and an operated position 21a2, which is a switched position where pressure oil is fed to the steering valve 23 according to an operation of the unillustrated steering wheel.
- the relief valve 21b specifies a maximum of switching pressure for the directional control valve 21a.
- the relief valve 21b is connected to a reservoir 27.
- the above-mentioned steering valve 22 includes a pump unit 22b for feeding pressure oil to the unillustrated steering cylinder, and a directional control valve 22a for controlling a flow of pressure oil to be fed to the pump unit 22b via the directional control valve 21a in the priority valve 21.
- the directional control valve 22a has a switched position 22a1 where pressure oil for allowing normal rotation of the pump unit 22b can be fed, another switched position 22a2 where pressure oil for allowing reverse rotation of the pump unit 22b can be fed, and a neutral position 22a3 where feeding of pressure oil to the pump unit 22b is prevented.
- the above-mentioned charge valve 25 includes check valves 30,31 and a check valve 32.
- the check valves 30, 31 allow feeding of pressure oil to the corresponding accumulators 24, but prevent flows of pressure oil from sides of the corresponding accumulators 24.
- the check valve 32 allows feeding of pressure oil in directions toward these check valves 30,31, but prevents flows of pressure oil from the sides of the check valves 30, 31.
- the charge valve 25 also includes a valve device, specifically an on/off valve 33 and a relief valve 34.
- the on/off valve 33 is held in a closed position 33a when the pressure of the accumulators 24 is low, but is switched to an open position 33b when the pressure of the accumulators 24 has arisen to a predetermined pressure.
- the relief valve 34 specifies a maximum of switching pressure for the on/off valve 33.
- the on/off valve 33 and relief valve 34 are connected to the reservoir 27.
- the charge valve 25 is arranged in an oil passage 35 that communicates the on/off valve 33 and the relief valve 34 to each other, and includes a filter 36 for trapping dust mixed in pressure oil that flows through the oil passage 35.
- the charge valve 25 also includes a check valve 37 in the above-mentioned oil passage 35 and in parallel with the filter 36 such that the check valve 37 allows a flow of pressure oil from a side of the on/off valve 33 toward a side of the relief valve 34 but prevents a flow of pressure oil from the side of the relief valve 34 toward the side of the on/off valve 33.
- the check valve 37 as described above is generally known to be inexpensive compared with a relief valve or the like.
- oil passage 26, which communicates the above-mentioned priority valve 21 and charge valve 25 to each other, is connected at an end thereof to an outlet port of the directional control valve 21a in the priority valve 21 and at an opposite end thereof to an oil passage that communicates the check valve 32 and the on/off valve 33 to each other in the charge valve 25.
- the directional control valve 22a in the steering valve 22a tends to be switched to either one of the switched positions 22a1, 22a2, and further, the directional control valve 21a in the priority valve 21 tends to be switched toward the operated position 21a2. Therefore, a substantial portion of pressure oil delivered from the hydraulic pump 20 is fed to the pump unit 22b via the filter 28, the operated position 21a2 of the directional control valve 21a in the priority valve 21 and the switched position 22a1 or switched position 22a2 of the directional control valve 22a in the steering valve 22, and is further fed from the pump unit 22b to the unillustrated steering cylinder. As a consequence, the travelling direction of the travel base 1 is determined.
- the relief valve 21b When the switching pressure for the directional control valve 21a in the priority valve 21 exceeds the preset pressure for the relief valve 21b during the above-mentioned feeding of pressure oil, the relief valve 21b is actuated to release the pressure oil of high pressure, which exceeds the preset pressure, to the reservoir 27 via the relief valve 21b.
- the directional control valve 21a in the priority valve 21 is held in the neutral position 21a1. Pressure oil delivered from the hydraulic pump 20 is, therefore, fed to the charge valve 25 via the switched position 21a1 of the directional control valve 21a1 in the priority valve 21 and the oil passage 26.
- the on/off valve 33 is held in the closed position 33a so that pressure oil from the hydraulic pump 20 is fed to the respective accumulators 24 via the check valve 32 and check valves 30, 31.
- the on/off valve 33 is switched to the open position 33b by a switching pressure applied to a section of the oil passage 35, said section being located between the on/off valve 33 and the filter 36.
- the pressure oil of a high pressure exceeding the predetermined pressure is released to the reservoir 27 via the open position 33b of the on/off valve 33.
- the relief valve 34 is actuated so that the pressure oil of a high pressure exceeding the preset pressure is released to the reservoir 26 via the filer 36 and relief valve 34.
- dust mixed in pressure oil flowing through the oil passage 38 is trapped by the filter 28 arranged in the oil passage 38 connected to the hydraulic pump 20, thereby performing the purification of pressure oil flowing on an upstream side of the hydraulic circuit including the hydraulic pump 20, priority valve 21, steering valve 22, charge valve 25, accumulators 24, brake valve 23 and the like. Further, dust mixed in pressure oil flowing through the oil passage 35 is trapped by the filter 36 arranged in the oil passage 35 that communicates the on/off valve 33 in the charge valve 25 and the relief valve 34 to each other, thereby performing the purification of pressure oil flowing on a downstream side of the relevant hydraulic circuit.
- the filter 28 and filter 36 the pressure oil flowing through these hydraulic circuits is, therefore, kept clean so that the individual hydraulic devices including the priority valve 21, steering valve 22, charge valve 25, brake valve 23 and the like are allowed to maintain good operation performance.
- this embodiment can guide the pressure oil to the relief valve 34 via the relatively-inexpensive check valve, specifically the check valve 37 arranged in parallel with the filter 36 and generally considered to be lower in price than a relief valve or the like, and owing to an actuation of the relief valve 34, can release the pressure oil of the high pressure.
- the filter 36 and check valve 37 are arranged in parallel with each other in the oil passage 35 that communicates the on/off valve 33 and the relief valve 34 to each other in the charge valve 25.
- a filter and check valve may be arranged in parallel with each other in the oil passage that communicates the directional control valve 21a and the relief valve 21b to each other in the priority valve 21.
- This alternative construction can realize the cleaning of pressure oil flowing through the oil passage that communicates the directional control valve 33 and the relief valve 21b to each other, and upon occurrence of clogging in the filter, can also guide pressure oil of a high pressure in an oil passage section, which communicates the directional control valve 33 and the filter to each other, to the relief valve 21b via the check valve so that the relief valve 21b is actuated to release it to the reservoir 27. It is, therefore, possible to avoid a breakage of the entire hydraulic circuit, which includes the directional control valve 21a, hydraulic pump 20 and the like, by arranging the inexpensive check valve.
- the above-described embodiment is configured to be applied to the wheel excavator.
- the working machine is, however, not limited to such a wheel excavator.
- This embodiment may be configured to be applied, for example, to a wheel loader.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
- This invention relates to a hydraulic drive system for a working machine such as a wheel excavator, which is to be arranged on the working machine and is provided with a filter for trapping dust mixed in oil flowing through an oil passage. A hydraulic drive system as described in the preamble portion of the single claim has been known from
DE 3237019 A1 . - As a conventional technology of this type, there is one described in
JP-A-6-35607 U - According to this conventional technology, oil which has been cleaned through the filter is fed to the hydraulic circuit. When clogging occurs in the filter and oil becomes difficult to pass through the filter, a high pressure is produced on an upstream side of the filter so that the oil is fed to the hydraulic circuit via the check valve arranged in parallel with the filter. As a consequence, it has become possible to avoid a breakage of the entire circuit including the hydraulic pump, which would otherwise occur a result of the clogging of the filter.
- Although the filter is arranged on the upstream side relative to the hydraulic pump in the above-mentioned conventional technology, a technology with a filter arranged in a hydraulic circuit on a downstream side relative to a hydraulic pump has also been known conventionally. Described specifically, it has also been known for years to arrange a valve device and a relief valve, which specifies a maximum of switching pressure for the valve device, in a hydraulic circuit on a downstream side of a hydraulic pump, and in an oil passage communicating the valve device and the relief valve to each other, to arrange a filter for trapping dust that flows through the oil passage. The technology constructed as described above can realize the cleaning of oil that flows through the oil circuit on the downstream side of the hydraulic pump.
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DE 3237019 A1 discloses a hydraulic drive system for a working machine, said system being provided with a hydraulic pump, an on/off valve switchable according to pressure oil delivered from the hydraulic pump, a relief valve specifying a maximum of switching pressure for the on/off valve, a filter arranged in an oil passage communicating the on/off valve and the relief valve to each other, and a check valve arranged in the oil passage and in parallel with the filter such that a flow of oil from a side of the on/off valve toward a side of the relief valve is allowed but a flow of oil from the side of the relief valve toward the side of the on/off valve is prevented. - In a hydraulic drive system having the above-mentioned, conventionally known construction, specifically the conventional technology having the construction that a filter is arranged in an oil passage communicating a valve device and a relief valve to each other, there is a problem associated with clogging of the filter. Described specifically, when the degree of clogging of the filter increases, a restriction is imposed on a flow of oil from the side of the filter to the side of the relief valve. Accordingly, the pressure in an oil passage section that communicates the valve device and the filter to each other gradually rises to a high pressure. As this high pressure is confined to the oil passage section, there is a potential problem that an entire hydraulic circuit including the oil passage and valve device may be broken.
- To avoid such a breakage of the hydraulic circuit, it may hence be contemplated to construct such that a relief valve is arranged between the valve device and the filter to release a high pressure when the pressure in the oil passage section, which communicates the valve device and the filter to each other, rises to the high pressure. However, a relief valve is generally expensive. The construction with a relief valve arranged as described above, therefore, involves an inconvenience that the hydraulic drive system requires higher manufacturing cost.
- With the above-mentioned actual situation of the conventional technology in view, the present invention has as an object thereof the provision of a hydraulic drive system for a working machine, which can guide oil of a high pressure in an oil passage section, which communicates a valve device and a filter to each other, to the relief valve by a relatively inexpensive structure even when clogging occurs in a filter arranged in an oil passage communicating the valve device and the relief valve to each other.
- According to the present invention this object is accomplished with a hydraulic drive system having the features of the single claim.
- According to the present invention constructed as described above, when clogging occurs in the filter arranged in the oil passage communicating the valve device and the relief valve to each other and the pressure in the oil passage section communicating the valve device and the filter to each other rises to a high pressure, oil is guided to the relief valve via the relatively inexpensive check valve arranged in parallel with the filter, in other words, the check valve generally considered to be inexpensive compared with a relief valve or the like, and the pressure oil of the high pressure can be released by an actuation of the relief valve. As a consequence, no high pressure is confined to the oil passage section, thereby making it possible to avoid a breakage of the entire hydraulic circuit including the oil passage and valve device.
- In the hydraulic drive system provided with the filter arranged in the oil passage communicating the valve device and the relief valve to each other, the check valve is arranged in the above-mentioned oil passage and in parallel with the filter to allow a flow of oil from the side of the valve device toward the side of the relief valve but to prevent a flow of oil from the side of the relief valve toward the side of the valve device. Even if clogging occurs in the filter, the present invention, therefore, can guide oil of a high pressure in the oil passage section, which communicates the valve device and the filter to each other, to the relief valve via the relatively inexpensive check valve. As a consequence, a breakage of the entire hydraulic circuit can be avoided while suppressing an increase in the manufacturing cost of the hydraulic drive system including the oil passage and valve device, so that the excellent protection of the hydraulic circuit can be realized at low cost.
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FIG. 1 is a side view showing a wheel excavator exemplified as an example of the working machine on which the hydraulic drive system according to the present invention is arranged. -
FIG. 2 is a hydraulic circuit illustrating a hydraulic drive system according to an embodiment, which can be arranged on the wheel excavator shown inFIG. 1 . - An embodiment of the hydraulic drive system according to the present invention for the working machine will hereinafter be described based on the drawings.
- The working machine on which the hydraulic drive system according to this embodiment can be arranged is, for example, a wheel excavator. As shown in
FIG. 1 , this wheel excavator is provided with a travel base 1 havingfront wheels 2 and rear wheels 3, an upperstructure 4 mounted on the travel base 1, andworking equipment 5 attached tiltably in an up-and-down direction to the upperstructure 4. Theworking equipment 5 includes aboom 6 tiltably arranged on the upperstructure 4, an arm 7 tiltably arranged on a free end of theboom 6, and abucket 8 tiltably arranged on a free end of the arm 7. An operator's cab 9 is arranged on the upperstructure 4 at a forward position thereof, and acounterweight 10 is arranged on the upperstructure 4 at a rear position thereof. Anengine compartment 11 is arranged between the operator's cab 9 and thecounterweight 11, and a main part of the hydraulic drive system according to this embodiment is accommodated in theengine compartment 11. - As illustrated in
FIG. 2 , the hydraulic drive system according to the present invention is provided with ahydraulic pump 20, apriority valve 21 communicated to thehydraulic pump 20, and asteering valve 22 arranged in continuation with thepriority valve 21 to feed pressure oil to an unillustrated steering cylinder according to an operation of an unillustrated steering wheel. Also provided are abrake valve 23 for feeding pressure oil, which applies a brake on thefront wheels 2 and rear wheels 3, to an unillustrated brake system according to a depression operation of abrake pedal 23a arranged in the operator's cab 9,accumulators 24 arranged in a pair, one for thefront wheels 2 and the other for the rear wheels 3, to accumulate pressure oil to be fed to thebrake valve 23, and acharge valve 25 communicated to the above-mentionedpriority valve 21 via anoil passage 26 to permit feeding pressure oil to theaccumulators 24. - In an
oil passage 38 that communicates thehydraulic pump 20 and thepriority valve 21 to each other, afilter 28 and acheck valve 29 are arranged in parallel with each other. Thefilter 28 traps dust mixed in pressure oil that flows through theoil passage 38. Thecheck valve 29 allows a flow of pressure oil from a side of thehydraulic pump 20 toward a side of thepriority valve 21, but prevents a flow of pressure oil from the side of thepriority valve 21 toward the side of thehydraulic pump 20. - The above-mentioned
priority valve 21 includes adirectional control valve 21a and arelief valve 21b. Thedirectional control valve 21a has a neutral position 21a1, which is a switched position where pressure oil can be fed to theaccumulators 24, and an operated position 21a2, which is a switched position where pressure oil is fed to thesteering valve 23 according to an operation of the unillustrated steering wheel. Therelief valve 21b specifies a maximum of switching pressure for thedirectional control valve 21a. Therelief valve 21b is connected to areservoir 27. - The above-mentioned
steering valve 22 includes apump unit 22b for feeding pressure oil to the unillustrated steering cylinder, and adirectional control valve 22a for controlling a flow of pressure oil to be fed to thepump unit 22b via thedirectional control valve 21a in thepriority valve 21. Thedirectional control valve 22a has a switched position 22a1 where pressure oil for allowing normal rotation of thepump unit 22b can be fed, another switched position 22a2 where pressure oil for allowing reverse rotation of thepump unit 22b can be fed, and a neutral position 22a3 where feeding of pressure oil to thepump unit 22b is prevented. - The above-mentioned
charge valve 25 includescheck valves check valve 32. Thecheck valves corresponding accumulators 24, but prevent flows of pressure oil from sides of thecorresponding accumulators 24. Thecheck valve 32 allows feeding of pressure oil in directions toward thesecheck valves check valves charge valve 25 also includes a valve device, specifically an on/offvalve 33 and arelief valve 34. The on/offvalve 33 is held in a closedposition 33a when the pressure of theaccumulators 24 is low, but is switched to an open position 33b when the pressure of theaccumulators 24 has arisen to a predetermined pressure. Therelief valve 34 specifies a maximum of switching pressure for the on/offvalve 33. The on/offvalve 33 andrelief valve 34 are connected to thereservoir 27. - The
charge valve 25 is arranged in anoil passage 35 that communicates the on/offvalve 33 and therelief valve 34 to each other, and includes afilter 36 for trapping dust mixed in pressure oil that flows through theoil passage 35. In this embodiment, thecharge valve 25 also includes acheck valve 37 in the above-mentionedoil passage 35 and in parallel with thefilter 36 such that thecheck valve 37 allows a flow of pressure oil from a side of the on/offvalve 33 toward a side of therelief valve 34 but prevents a flow of pressure oil from the side of therelief valve 34 toward the side of the on/offvalve 33. Thecheck valve 37 as described above is generally known to be inexpensive compared with a relief valve or the like. It is to be noted that theoil passage 26, which communicates the above-mentionedpriority valve 21 andcharge valve 25 to each other, is connected at an end thereof to an outlet port of thedirectional control valve 21a in thepriority valve 21 and at an opposite end thereof to an oil passage that communicates thecheck valve 32 and the on/offvalve 33 to each other in thecharge valve 25. - When the unillustrated steering wheel is operated in this embodiment constructed as described above, the
directional control valve 22a in thesteering valve 22a tends to be switched to either one of the switched positions 22a1, 22a2, and further, thedirectional control valve 21a in thepriority valve 21 tends to be switched toward the operated position 21a2. Therefore, a substantial portion of pressure oil delivered from thehydraulic pump 20 is fed to thepump unit 22b via thefilter 28, the operated position 21a2 of thedirectional control valve 21a in thepriority valve 21 and the switched position 22a1 or switched position 22a2 of thedirectional control valve 22a in thesteering valve 22, and is further fed from thepump unit 22b to the unillustrated steering cylinder. As a consequence, the travelling direction of the travel base 1 is determined. When the switching pressure for thedirectional control valve 21a in thepriority valve 21 exceeds the preset pressure for therelief valve 21b during the above-mentioned feeding of pressure oil, therelief valve 21b is actuated to release the pressure oil of high pressure, which exceeds the preset pressure, to thereservoir 27 via therelief valve 21b. - It is to be noted that even during an operation of the above-mentioned unillustrated steering wheel, a portion of pressure oil delivered from the
hydraulic pump 20 may be fed, depending on the steering angle of the steering wheel, to theoil passage 26 from a side of the neutral position 21a1 of thedirectional control valve 21a in thepriority valve 21. In such an instance, the accumulation of pressure to theaccumulators 24 is feasible accordingly. - In a non-operated state of the unillustrated steering wheel, on the other hand, the
directional control valve 21a in thepriority valve 21 is held in the neutral position 21a1. Pressure oil delivered from thehydraulic pump 20 is, therefore, fed to thecharge valve 25 via the switched position 21a1 of the directional control valve 21a1 in thepriority valve 21 and theoil passage 26. In a state that the pressure accumulated in theaccumulators 24 has not arisen to the predetermined pressure at this time, the on/offvalve 33 is held in theclosed position 33a so that pressure oil from thehydraulic pump 20 is fed to therespective accumulators 24 via thecheck valve 32 andcheck valves accumulators 24 has arisen to the predetermined pressure, the on/offvalve 33 is switched to the open position 33b by a switching pressure applied to a section of theoil passage 35, said section being located between the on/offvalve 33 and thefilter 36. As a consequence, the pressure oil of a high pressure exceeding the predetermined pressure is released to thereservoir 27 via the open position 33b of the on/offvalve 33. When the above-mentioned switching pressure exceeds the preset pressure for therelief valve 34, therelief valve 34 is actuated so that the pressure oil of a high pressure exceeding the preset pressure is released to thereservoir 26 via thefiler 36 andrelief valve 34. - It is to be noted that, when the
brake pedal 23a is depressed while traveling is performed by the drive of thefront wheels 2 and rear wheels 3 of the travel base 1, the pressure oil in theaccumulators 24 is fed to the unillustrated brake system via thebrake valve 23 and a braking force is applied to thefront wheels 2 and rear wheels 3 to stop the travel base 1. - While such operations as described above are being performed, dust mixed in pressure oil flowing through the
oil passage 38 is trapped by thefilter 28 arranged in theoil passage 38 connected to thehydraulic pump 20, thereby performing the purification of pressure oil flowing on an upstream side of the hydraulic circuit including thehydraulic pump 20,priority valve 21, steeringvalve 22,charge valve 25,accumulators 24,brake valve 23 and the like. Further, dust mixed in pressure oil flowing through theoil passage 35 is trapped by thefilter 36 arranged in theoil passage 35 that communicates the on/offvalve 33 in thecharge valve 25 and therelief valve 34 to each other, thereby performing the purification of pressure oil flowing on a downstream side of the relevant hydraulic circuit. By thefilter 28 andfilter 36, the pressure oil flowing through these hydraulic circuits is, therefore, kept clean so that the individual hydraulic devices including thepriority valve 21, steeringvalve 22,charge valve 25,brake valve 23 and the like are allowed to maintain good operation performance. - When clogging occurs in the
filter 28 arranged in theoil passage 38 connecting thehydraulic pump 20 and thepriority valve 21 to each other and pressure oil becomes difficult to pass through thefilter 28, pressure oil is fed from thehydraulic pump 20 to thepriority valve 21 via thecheck valve 29 arranged in parallel with thefilter 28. Desired operations can, therefore, be continuously performed while avoiding a breakage of the entire hydraulic circuit, although the cleaning function for pressure oil flowing through theoil passage 38 is reduced. When clogging occurs in thefilter 36 arranged in theoil passage 35 communicating the on/offvalve 33 and therelief valve 34 to each other in thecharge valve 25 and pressure oil becomes difficult to pass through thefilter 36, on the other hand, the pressure oil in the section of thehydraulic passage 35, said section being located between the on/offvalve 33 and thefilter 36, is fed to therelief valve 34 via thecheck valve 37 arranged in parallel with thefilter 36. When the pressure of this pressure oil arises to a high pressure exceeding the preset pressure for therelief valve 34, therelief valve 34 is, therefore, actuated so that the pressure oil of the high pressure exceeding the preset pressure is released to thereservoir 27. It is, therefore, possible to surely avoid a breakage of the entire hydraulic circuit, which includes thepassage 35, on/offvalve 33,hydraulic pump 20 and the like, by pressure oil of a high pressure occurring in the section of theoil passage 35, said section being located between the on/offvalve 33 and thefilter 36, although the cleaning function for pressure oil flowing through theoil passage 35 is reduced. - As mentioned above, when clogging occurs in the
filter 36 arranged in theoil passage 35 communicating the on/offvalve 33 and therelief valve 34 to each other and the pressure in a section of theoil passage 35, said section communicating the on/offvalve 33 and thefilter 36 to each other, becomes high, this embodiment can guide the pressure oil to therelief valve 34 via the relatively-inexpensive check valve, specifically thecheck valve 37 arranged in parallel with thefilter 36 and generally considered to be lower in price than a relief valve or the like, and owing to an actuation of therelief valve 34, can release the pressure oil of the high pressure. As a consequence, it is possible to avoid a breakage of the entire hydraulic circuit while preventing an increase in the manufacturing cost of the hydraulic drive system including theoil passage 35 and on/offvalve 33, and therefore, to realize the excellent protection of the hydraulic circuit at low cost, although the cleaning function for pressure oil by thefilter 36 is reduced as mentioned above. - In the above-described embodiment, the
filter 36 andcheck valve 37 are arranged in parallel with each other in theoil passage 35 that communicates the on/offvalve 33 and therelief valve 34 to each other in thecharge valve 25. As an alternative, a filter and check valve may be arranged in parallel with each other in the oil passage that communicates thedirectional control valve 21a and therelief valve 21b to each other in thepriority valve 21. This alternative construction can realize the cleaning of pressure oil flowing through the oil passage that communicates thedirectional control valve 33 and therelief valve 21b to each other, and upon occurrence of clogging in the filter, can also guide pressure oil of a high pressure in an oil passage section, which communicates thedirectional control valve 33 and the filter to each other, to therelief valve 21b via the check valve so that therelief valve 21b is actuated to release it to thereservoir 27. It is, therefore, possible to avoid a breakage of the entire hydraulic circuit, which includes thedirectional control valve 21a,hydraulic pump 20 and the like, by arranging the inexpensive check valve. - The above-described embodiment is configured to be applied to the wheel excavator. In the present invention, the working machine is, however, not limited to such a wheel excavator. This embodiment may be configured to be applied, for example, to a wheel loader.
-
- 1
- Travel base
- 4
- Upperstructure
- 5
- Working equipment
- 20
- Hydraulic pump
- 21
- Priority valve
- 22
- Steering valve
- 23
- Brake valve
- 24
- Accumulator
- 25
- Charge valve (valve)
- 26
- Oil passage
- 27
- Reservoir
- 33
- On/off valve
- 34
- Relief valve
- 35
- Oil passage
- 36
- Filter (another filter)
- 37
- Check valve (another check valve)
- 38
- Oil passage (another oil passage)
Claims (1)
- A hydraulic drive system for a working machine, said system being provided with a hydraulic pump (20), anon/off valve (33) switchable according to pressure oil delivered from the hydraulic pump (20), a relief valve (34) specifying a maximum of switching pressure for the on/off valve (33), a filter (36) arranged in an oil passage (35) communicating the on/off valve (33) and the relief valve (34) to each other, and
a check valve (37) arranged in the oil passage (35) and in parallel with the filter (36) such that a flow of oil from a side of the on/off valve (33) toward a side of the relief valve (34) is allowed but a flow of oil from the side of the relief valve (34) toward the side of the on/off valve (33) is prevented,
characterized in that the system is further provided with:a brake valve (23), an accumulator (24), which can feed pressure oil to the brake valve (23), anda charge valve (25) capable of feeding pressure oil to the accumulator (24), which includes therein the on/off valve (33), the relief valve (34), the oil passage (35), the filter (36) and the check valve (37), andwhen an accumulated pressure in the accumulator (24) becomes higher than a predetermined pressure, the on/off valve (33) releases pressure oil of the higher pressure.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010248558A JP5481350B2 (en) | 2010-11-05 | 2010-11-05 | Hydraulic drive device for work machine |
PCT/JP2011/075078 WO2012060331A1 (en) | 2010-11-05 | 2011-10-31 | Hydraulic drive device for construction machine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2636910A1 EP2636910A1 (en) | 2013-09-11 |
EP2636910A4 EP2636910A4 (en) | 2016-07-13 |
EP2636910B1 true EP2636910B1 (en) | 2018-06-20 |
Family
ID=46024445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11837981.7A Active EP2636910B1 (en) | 2010-11-05 | 2011-10-31 | Hydraulic drive device for construction machine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2636910B1 (en) |
JP (1) | JP5481350B2 (en) |
KR (1) | KR101850570B1 (en) |
CN (1) | CN103201523B (en) |
WO (1) | WO2012060331A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103711172B (en) * | 2013-12-18 | 2015-12-09 | 广西柳工机械股份有限公司 | The quantitative combining hydraulic system of loader four pump |
CN105986595B (en) * | 2015-02-04 | 2019-10-01 | 卡特彼勒(青州)有限公司 | Hydraulic system and machine for machine |
CN110382784B (en) * | 2017-12-26 | 2022-03-11 | 日立建机株式会社 | Working machine |
CN108373129A (en) * | 2018-04-28 | 2018-08-07 | 浙江大学舟山海洋研究中心 | The synchronous lifting device of super low temperature quick frozen production line |
CN111120437B (en) * | 2020-02-05 | 2023-06-06 | 山东路得威工程机械制造有限公司 | Multimode steering traveling system of engineering machinery |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3237019C2 (en) * | 1981-10-07 | 1994-07-28 | Linde Ag | Lift truck with a steering system with hydrostatic power steering system |
JPH0650810B2 (en) | 1986-06-25 | 1994-06-29 | 富士通テン株式会社 | Sound quality control device |
JP2514098Y2 (en) * | 1990-08-03 | 1996-10-16 | 本田技研工業株式会社 | Hydraulic control device for active suspension system |
JPH0635607U (en) * | 1992-10-12 | 1994-05-13 | カヤバ工業株式会社 | Filter device with protection circuit |
JP2582783Y2 (en) * | 1993-12-22 | 1998-10-08 | 株式会社新潟鉄工所 | Hydraulic filtration circuit |
US5895099A (en) * | 1997-10-17 | 1999-04-20 | Deere & Company | Hydraulic structure for a brake system |
JP4111286B2 (en) * | 1998-06-30 | 2008-07-02 | コベルコ建機株式会社 | Construction machine traveling control method and apparatus |
JP4151597B2 (en) * | 2004-03-31 | 2008-09-17 | コベルコ建機株式会社 | Hydraulic control circuit and construction machinery |
JP2006036021A (en) * | 2004-07-27 | 2006-02-09 | Hitachi Constr Mach Co Ltd | Hydraulic drive device |
JP2006290236A (en) * | 2005-04-13 | 2006-10-26 | Hitachi Constr Mach Co Ltd | Hydraulic drive device |
JP4871778B2 (en) * | 2007-04-16 | 2012-02-08 | 日立建機株式会社 | Filter clogging judgment device for construction machinery |
JP5380236B2 (en) * | 2009-10-07 | 2014-01-08 | 日立建機株式会社 | Hydraulic drive unit for wheel type construction machine |
-
2010
- 2010-11-05 JP JP2010248558A patent/JP5481350B2/en active Active
-
2011
- 2011-10-31 WO PCT/JP2011/075078 patent/WO2012060331A1/en active Application Filing
- 2011-10-31 EP EP11837981.7A patent/EP2636910B1/en active Active
- 2011-10-31 CN CN201180053096.2A patent/CN103201523B/en active Active
- 2011-10-31 KR KR1020137011676A patent/KR101850570B1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
WO2012060331A1 (en) | 2012-05-10 |
EP2636910A4 (en) | 2016-07-13 |
CN103201523B (en) | 2015-05-06 |
KR20130143581A (en) | 2013-12-31 |
EP2636910A1 (en) | 2013-09-11 |
CN103201523A (en) | 2013-07-10 |
JP2012097885A (en) | 2012-05-24 |
JP5481350B2 (en) | 2014-04-23 |
KR101850570B1 (en) | 2018-04-19 |
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