CN103201523A - Hydraulic drive device for construction machine - Google Patents
Hydraulic drive device for construction machine Download PDFInfo
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- CN103201523A CN103201523A CN2011800530962A CN201180053096A CN103201523A CN 103201523 A CN103201523 A CN 103201523A CN 2011800530962 A CN2011800530962 A CN 2011800530962A CN 201180053096 A CN201180053096 A CN 201180053096A CN 103201523 A CN103201523 A CN 103201523A
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- Prior art keywords
- valve
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- filter
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- 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
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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
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- 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
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- 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
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- 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
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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
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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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
- 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
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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
- 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
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
Landscapes
- 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)
Abstract
The present invention aims to provide a hydraulic drive device for a construction machine which is configured in such a manner that, even if a filter disposed in an oil path for connecting a valve and a relief valve clogs, high-pressure oil in a portion of the oil path, the portion connecting the valve and the filter, can be led to the relief valve using a relatively inexpensive structure. [Solution] The present invention is provided with: a hydraulic pump (20); and a charge valve (25) to which pressure oil from the hydraulic pump (20) is supplied through an oil path (26). The charge valve (25) has provided therein: a valve, such as an on-off valve (33), switched by the pressure oil discharged from the hydraulic pump (20); a relief valve (34) for determining the maximum value of the pressure for switching the on-off valve (33); and a filter (36) disposed in the oil path (35) for connecting the on-off valve (33) and the relief valve (34). The oil path (35) is provided with a check valve (37) which is provided parallel to the filter (36), permits the flow of the pressure oil from the on-off valve (33) side to the relief valve (34) side, and blocks the flow of the pressure oil from the relief valve (34) side to the on-off valve (33) side.
Description
Technical field
The present invention relates to be arranged in the Work machine such as wheel excavator and possess the fluid pressure drive device of the Work machine of filter, this filter is used for being captured in the foreign material of sneaking in the oil that oil circuit flows.
Background technique
As this prior art, there is the technology of record in the patent documentation 1.Prior art shown in this patent documentation 1 possesses following structure, that is, possess filter and safety check, wherein, this filter is located at supply from the upstream oil circuit of the oil hydraulic circuit of the pressure oil of oil hydraulic pump discharge, is used for capturing the foreign material of sneaking into from the oil of oil hydraulic pump discharge; This safety check is configured in the oil circuit in the mode that is set up in parallel with this filter, allows oil from oil hydraulic pump side hydraulic loop side flow, and stops oil to flow from oil hydraulic circuit side hydraulic pump side.
According to the prior art, the oil that becomes clean by filter is fed in the oil hydraulic circuit.In addition, stop up at filter generation mesh, when oil was difficult to by filter, because the upstream of filter becomes high pressure, therefore oil was fed in the oil hydraulic circuit via the safety check that is set up in parallel with filter.Thus, can prevent from stopping up along with the mesh of filter the breakage in the whole loop that comprises oil hydraulic pump that produces.
Though above-mentioned prior art is at upstream side filter to be set with respect to oil hydraulic pump, it also is existing known with respect to oil hydraulic pump filter being set in the oil hydraulic circuit in downstream side.Namely, possess valve body and regulation as the safety valve of the maximum pressure of the switching pressure of this valve body in the oil hydraulic circuit in the downstream side of oil hydraulic pump, it also is existing known possessing for the structure of filter that is captured in the foreign material that this oil circuit flows in the oil circuit that connects valve body and safety valve.The technology of Gou Chenging can be implemented in the cleaning of the oil that flows in the oil circuit in downstream side of oil hydraulic pump like this.
The prior art document
Patent documentation
Patent documentation 1: Japan opens flat 6-35607 communique in fact
Summary of the invention
Invent problem to be solved
At the fluid pressure drive device with above-mentioned existing known structure, namely have in the oil circuit that is connecting valve body and safety valve and arrange in the prior art of structure of filter, exist the mesh of filter to stop up the problem of bringing.Namely, if the mesh chocking-up degree of filter aggravation, then oil is from mobile being restricted of filter side direction safety valve side, therefore the oil circuit part that connects valve body and filter becomes high pressure gradually, this high pressure is enclosed this oil circuit part, so might make the oil hydraulic circuit that comprises this oil circuit, valve body whole damaged.
Therefore, in order to prevent the breakage of this oil hydraulic circuit, can consider to constitute: between valve body and filter, safety valve is set, when the oil circuit that connects valve body and filter partly becomes high pressure, discharges this high pressure from safety valve.But, because the safety valve price general charged is higher, if safety valve is set like this, then can produce the problem of the fabricating cost increase of this fluid pressure drive device.
The present invention is based on above-mentioned actual conditions of the prior art and finishes, its purpose is to provide a kind of fluid pressure drive device of Work machine, even be configured in filter generation mesh in the oil circuit that connects valve body and safety valve when stopping up, also can guide to safety valve by the oil that the lower structure of price will connect the oil circuit high pressure conditions partly of valve body and filter.
Be used for solving the method for problem
In order to reach this purpose, the fluid pressure drive device of the Work machine that the present invention relates to possesses: oil hydraulic pump; The valve body that is switched according to the pressure oil of discharging from this oil hydraulic pump; Stipulate the safety valve of maximum pressure of the switching pressure of this valve body; And be arranged on filter in the oil circuit that connects above-mentioned valve body and above-mentioned safety valve, the fluid pressure drive device of above-mentioned Work machine is characterised in that, in above-mentioned oil circuit, be provided with safety check in the mode that is set up in parallel with above-mentioned filter, this safety check allows oil from the above-mentioned safety valve side flow of above-mentioned valve body side direction, and stops oil from the above-mentioned valve body side flow of above-mentioned safety valve side direction.
The present invention according to such formation, the filter generation mesh that is configured in the oil circuit that connects valve body and safety valve stops up, when the oil circuit of connection valve body and filter partly becomes high pressure, can be via the lower safety check of the price that is set up in parallel with filter, namely the price safety check that is lower than safety valve etc. guides to safety valve with oil generally speaking, and utilizes the pressure oil of the releases high pressure of this safety valve.Thus, can in this oil circuit part, not enclose high pressure, can prevent from comprising the breakage of the oil hydraulic circuit integral body of oil circuit, valve body.
In addition, the fluid pressure drive device of the Work machine that the present invention relates to is characterised in that, in foregoing invention, has valve, the pressure oil of discharging from above-mentioned oil hydraulic pump is fed into this valve, is provided with above-mentioned valve body, above-mentioned safety valve, above-mentioned oil circuit, above-mentioned filter and above-mentioned safety check in this valve.
In addition, the fluid pressure drive device of the Work machine that the present invention relates to is characterised in that, in foregoing invention, possesses brake valve and can be to the accumulator of this brake valve supply pressure oil, above-mentioned valve comprises can be to the charge valve of above-mentioned accumulator supply pressure oil, above-mentioned valve body comprises switch valve, and when the pressure accumulation of above-mentioned accumulator became higher than authorized pressure, this switch valve can discharge the pressure oil of this high pressure.
In addition, the fluid pressure drive device of the Work machine that the present invention relates to is characterised in that, in foregoing invention, above-mentioned Work machine is made of wheel excavator, the fluid pressure drive device of above-mentioned Work machine possesses sequence valve and switching valve, the pressure oil of discharging from above-mentioned oil hydraulic pump is fed into this sequence valve and the switching valve, be provided with via the oil circuit of said sequence valve to above-mentioned charge valve guide pressure oil, and, in other oil circuits that connect above-mentioned oil hydraulic pump and said sequence valve, be provided with other filters, in above-mentioned other oil circuits, dispose safety check in the mode that is set up in parallel with above-mentioned other filters, this safety check allows oil from above-mentioned oil hydraulic pump side direction said sequence valve side flow, and stops oil from the above-mentioned oil hydraulic pump side flow of said sequence valve side direction.
The effect of invention
According to the present invention, in the oil circuit that connects valve body and safety valve, possesses filter, in above-mentioned oil circuit, be provided with safety check in the mode that is set up in parallel with filter, therefore this safety check allows oil from valve body side direction safety valve side flow, and stops oil from safety valve side direction valve body side flow,, even filter generation mesh stops up, also can guide to safety valve by the oil that the lower safety check of price will connect the oil circuit high pressure partly of valve body and filter.Thereby the fabricating cost that can suppress to comprise this fluid pressure drive device of oil circuit, valve body increases, and prevents the breakage of oil hydraulic circuit integral body simultaneously, can realize excellent oil hydraulic circuit protection with low cost.
Description of drawings
Fig. 1 is expression as an example of the Work machine that fluid pressure drive device of the present invention is installed and the side view of the wheel excavator enumerated.
Fig. 2 is the hydraulic circuit diagram that expression is installed in the fluid pressure drive device of the present embodiment on the wheel excavator shown in Figure 1.
Embodiment
Below, the mode of execution to the fluid pressure drive device of Work machine of the present invention describes with reference to the accompanying drawings.
The Work machine of the fluid pressure drive device of present embodiment is installed, and for example is wheel excavator.As shown in Figure 1, this wheel excavator possesses: the runner 1 with front-wheel 2 and trailing wheel 3; Be configured in the solid of rotation 4 on this runner 1; Be installed in apparatus for work 5 on this solid of rotation 4 in the mode that can rotate along the vertical direction.Apparatus for work 5 comprises: be arranged on shear leg 6 on the solid of rotation 4 in the mode that can rotate; Be arranged on the cantilever 7 of the front end of this shear leg 6 in the mode that can rotate; And the scraper bowl 8 that is arranged on the front end of this cantilever 7 in the mode that can rotate.Forward position on solid of rotation 4 disposes operator cabin 9, disposes counterweight 10 in its rearward position.Between operator cabin 9 and counterweight 10, dispose machine room 11, the major component of in this machine room 11, taking in the fluid pressure drive device of present embodiment.
As shown in Figure 2, the fluid pressure drive device of present embodiment possesses: oil hydraulic pump 20; The sequence valve 21 that is connected with this oil hydraulic pump 20; And be connected with this sequence valve 21 arrange and according to the operation of not shown steering wheel to the not shown switching valve 22 that turns to oil cylinder supply pressure oil.In addition, also possess: brake valve 23, this brake valve 23 is supplied with the pressure oil that front-wheel 2, trailing wheel 3 are braked according to the operation of trampling that is configured in the brake petal 23a in the operator cabin 9 to not shown braking device; Accumulator 24, this accumulator 24 correspond respectively to front-wheel 2, trailing wheel 3 and are provided with a pair ofly, are used for the pressure oil that supplies to brake valve 23 is carried out pressure accumulation; And charge valve 25, this charge valve 25 is connected with said sequence valve 21 via oil circuit 26, and can be to accumulator 24 supply pressure oil.
In the oil circuit 38 that connects oil hydraulic pump 20 and sequence valve 21, be set side by side with filter 28 and safety check 29, wherein, this filter 28 is used for being captured in the foreign material of sneaking in the pressure oil that this oil circuit 38 flows; These safety check 29 authorized pressure oil are from oil hydraulic pump 20 side direction sequence valves 21 side flow, and prevention oil is from sequence valve 21 side hydraulic pumps 20 side flow.
Said sequence valve 21 comprises direction switching valve 21a and safety valve 21b, wherein, this direction switching valve 21a has as can be to the neutral position 21a1 of the switching position of accumulator 24 supply pressure oil and as according to the operation of the not shown steering wheel operating position 21a2 to the switching position of switching valve 23 supply pressure oil; This safety valve 21b stipulates the maximum pressure of the switching pressure of this direction switching valve 21a.Safety valve 21b is connected with container 27.
Above-mentioned switching valve 22 comprises the 22b of pump portion and direction switching valve 22a, and wherein, the 22b of this pump portion is to the not shown oil cylinder supply pressure oil that turns to; This direction switching valve 22a control supplies to the flowing of pressure oil of the 22b of pump portion via the direction switching valve 21a of sequence valve 21.Direction switching valve 22a has can supply with the switching position 22a1 that makes the pressure oil that the 22b of pump portion just changeing, can supply with the switching position 22a2 of the pressure oil that makes the 22b of pump portion counter-rotating and stop neutral position 22a3 to the 22b of pump portion supply pressure oil.
Above-mentioned charge valve 25 comprises safety check 30,31 and safety check 32, and wherein, this safety check 30,31 can be to each accumulator 24 supply pressure oil, stops flowing from the pressure oil of accumulator 24 sides; This safety check 32 can be to these safety check 30,31 direction supply pressure oil, stop flowing from the pressure oil of safety check 30,31 sides.This charge valve 25 also comprises in addition: be maintained in its closed position 33a when the pressure of accumulator 24 is low, and switches to valve body, the switch valve 33 of open position 33b during up to preset pressure at the pressure of accumulator 24; And the safety valve 34 of maximum pressure of stipulating the switching pressure of this switch valve 33.Switch valve 33 and safety valve 34 are connected with container 27.
In addition, this charge valve 25 comprises the filter 36 that is arranged in the oil circuit 35 that connects switch valve 33 and safety valve 34, and this filter 36 is used for being captured in the foreign material of sneaking in the pressure oil that this oil circuit 35 flows.And present embodiment constitutes: charge valve 25 is included in the safety check 37 that is set up in parallel with filter 36 in the above-mentioned oil circuit 35, these safety check 37 authorized pressure oil are from switch valve 33 side direction safety valves 34 side flow, and prevention pressure oil is from safety valve 34 side direction switch valves 33 side flow.Known this safety check 37 price general chargeds are lower than safety valve etc.In addition, an end that connects the oil circuit 26 of said sequence valve 21 and charge valve 25 is connected with the outlet port of the direction switching valve 21a of sequence valve 21, and the other end is connected with the oil circuit of the safety check 32 that is connected charge valve 25 and switch valve 33.
In the present embodiment that constitutes like this, when operating not shown steering wheel, following tendency occurs: the direction switching valve 22a of switching valve 22 is switched to any switching position among switching position 22a1, the 22a2, and the direction switching valve 21a of sequence valve 21 is switched to operating position 21a2 side simultaneously.Therefore, a large portion of the pressure oil of discharging from oil hydraulic pump 20, switching position 22a1 or switching position 22a2 via the direction switching valve 22a of the operating position 21a2 of the direction switching valve 21a of filter 28, sequence valve 21, switching valve 22, be fed into the 22b of pump portion, and then supply to the not shown oil cylinder that turns to from the 22b of pump portion.Determined the direction of travel of runner 1 thus.During this period, when the switching pressure of the direction switching valve 21a of sequence valve 21 surpasses the setting pressure of safety valve 21b, safety valve 21b action, the pressure oil that surpasses the high pressure of its setting pressure is released in the container 27 by safety valve 21b.
In addition, when the above-mentioned not shown steering wheel of operation, also be the operation amount according to steering wheel, the part of the pressure oil that will discharge from oil hydraulic pump 20 supplies to the oil circuit 26 from the neutral position 21a1 side of the direction switching valve 21a of sequence valve 21.Therefore, can store up pressure to accumulator 24 under these circumstances.
In addition, under the state of not operating not shown steering wheel, the direction switching valve 21a of sequence valve 21 remains on pressure oil that neutral position 21a1 therefore discharges from oil hydraulic pump 20 via switching position 21a1, the oil circuit 26 of the direction switching valve 21a of sequence valve 21, is fed into charge valve 25.At this moment, when the pressure accumulation of accumulator 24 did not reach the state of preset pressure, switch valve 33 was maintained in its closed position 33a, and the pressure oil of oil hydraulic pump 20 is fed in each accumulator 24 via safety check 32, safety check 30,31.When each accumulator 24 reached authorized pressure, by imposing on the switching pressure of oil circuit 35 parts between switch valve 33 and filter 36, switch valve 33 was switched to open position 33b.Thus, the pressure oil that surpasses the high pressure of authorized pressure is released in the container 27 via the open position 33b of switch valve 33.In addition, when above-mentioned switching pressure surpasses the setting pressure of safety valve 34, safety valve 34 actions, the pressure oil that surpasses the high pressure of its setting pressure is released in the container 27 by filter 36, safety valve 34.
In addition, when the front-wheel 2 by driving runner 1 and trailing wheel 3 travel, if trample brake petal 23a, the pressure oil of accumulator 24 is fed in the not shown braking device by brake valve 23 and front-wheel 2 and trailing wheel 3 is applied braking force so, and runner 1 stops.
Carry out above-mentioned action during, by being arranged on the filter 28 on the oil circuit 38 that is connected with oil hydraulic pump 20, the foreign material of sneaking in the pressure oil that flows in oil circuit 38 are captured, thereby the purification that comprises the pressure oil that the upstream side of this oil hydraulic circuit of oil hydraulic pump 20, sequence valve 21, switching valve 22, charge valve 25, accumulator 24 and brake valve 23 etc. flows is carried out.In addition, by the filter 36 in the oil circuit 35 that is arranged on the switch valve 33 that connects charge valve 25 and safety valve 34, the foreign material of sneaking in the pressure oil that flows in oil circuit 35 are captured, and the cleaningization of the pressure oil that flows in the downstream side of this oil hydraulic circuit is carried out.That is, can remain in this oil hydraulic circuit the cleaning of the pressure oil that flows by filter 28 and filter 36, keep the good operation performance of each hydraulic equipment that comprises sequence valve 21, switching valve 22, charge valve 25, brake valve 23 etc.
And, mesh takes place and stops up in the filter 28 in being arranged on the oil circuit 38 that connects oil hydraulic pump 20 and sequence valve 21, when pressure oil was difficult to by this filter 28, the pressure oil of oil hydraulic pump 20 was fed into sequence valve 21 by the safety check 29 that is set up in parallel with filter 28.Therefore, though fail for the purification function of the pressure oil that in oil circuit 38, flows, can prevent the breakage of oil hydraulic circuit integral body, and can continue to implement desired procedure.In addition, meshes take place and stop up in the filter 36 in the oil circuit 35 of the switch valve 33 that is arranged on connection charge valve 25 and safety valve 34, when pressure oil is difficult to by this filter 36, the pressure oil of oil circuit 35 parts between switch valve 33 and filter 36 is fed into safety valve 34 by the safety check 37 that is set up in parallel with filter 36.Therefore, when the pressure of this pressure oil becomes high pressure above the setting pressure of safety valve 34, safety valve 34 actions, the pressure oil that surpasses the high pressure of its setting pressure is released in the container 27.Therefore, though the purification function decline for the pressure oil that flows in oil circuit 35 can prevent the high-pressure oil breakage that cause, that comprise the oil hydraulic circuit integral body of oil circuit 35, switch valve 33, oil hydraulic pump 20 etc. of oil circuit 35 parts between switch valve 33 and filter 36 reliably.
As mentioned above, according to present embodiment, mesh takes place and stops up in the filter 36 in being configured in the oil circuit 35 that connects switch valve 33 and safety valve 34, when oil circuit 35 parts of connection switch valve 33 and filter 36 become high pressure, can be by the price that is set up in parallel with filter 36 lower safety check, namely price is lower than the safety check 37 of safety valve etc. generally speaking, pressure oil is guided to safety valve 34, the pressure oil of the releases high pressure by this safety valve 34.Thus; as mentioned above, though utilize filter 36 to purify the deterioration of pressure oil, can suppress to comprise that the fabricating cost of this fluid pressure drive device of this oil circuit 35, switch valve 33 uprises; can prevent simultaneously the breakage of oil hydraulic circuit integral body, realize excellent oil hydraulic circuit protection with low cost.
In addition, though above-mentioned mode of execution constitutes connecting switch valve 33 that charge valve 25 comprises and the oil circuit 35 of safety valve 34 and is set up in parallel filter 36 and safety check 37, the direction switching valve 21a that also can constitute at order of connection valve 21 and the oil circuit of safety valve 21b are set up in parallel filter and safety check.In the device that constitutes like this, can be implemented in the purification of the pressure oil that flows in the oil circuit of connecting direction switching valve 33 and safety valve 21b, and when the mesh obstruction appears in filter, can the high-pressure oil of the oil circuit of connecting direction switching valve 33 and filter part be guided to safety valve 21b by safety check, make this safety valve 21b action so that this high-pressure oil is discharged in the container 27.That is, by cheap safety check is set, can prevent from comprising the breakage of the oil hydraulic circuit integral body of direction switching valve 21a, oil hydraulic pump 20 etc.
In addition, be installed on the wheel excavator though above-mentioned mode of execution constitutes, it is wheel excavator that the present invention does not limit Work machine.For example, also can constitute at wheel loader and possess present embodiment.
Symbol description
1-runner, 4-solid of rotation, 5-apparatus for work, 20-oil hydraulic pump, 21-sequence valve, 22-switching valve, 23-brake valve, 24-accumulator, 25-charge valve (valve), 26-oil circuit, 27-container, 33-switch valve (valve body), 34-safety valve, 35-oil circuit, 36-filter (other filters), 37-safety check (other safety check), 38-oil circuit (other oil circuits).
Claims (4)
1. the fluid pressure drive device of a Work machine possesses: oil hydraulic pump; The valve body that is switched according to the pressure oil of discharging from this oil hydraulic pump; Stipulate the safety valve of maximum pressure of the switching pressure of this valve body; And be arranged on filter in the oil circuit that connects above-mentioned valve body and above-mentioned safety valve,
The fluid pressure drive device of above-mentioned Work machine is characterised in that,
In above-mentioned oil circuit, be provided with safety check in the mode that is set up in parallel with above-mentioned filter, this safety check allows oil from the above-mentioned safety valve side flow of above-mentioned valve body side direction, and stops oil from the above-mentioned valve body side flow of above-mentioned safety valve side direction.
2. the fluid pressure drive device of Work machine according to claim 1 is characterized in that,
Have valve, the pressure oil of discharging from above-mentioned oil hydraulic pump is fed into this valve,
In this valve, be provided with above-mentioned valve body, above-mentioned safety valve, above-mentioned oil circuit, above-mentioned filter and above-mentioned safety check.
3. the fluid pressure drive device of Work machine according to claim 2 is characterized in that,
Possess brake valve and can be to the accumulator of this brake valve supply pressure oil,
Above-mentioned valve comprises can be to the charge valve of above-mentioned accumulator supply pressure oil,
Above-mentioned valve body comprises switch valve, and when the pressure accumulation of above-mentioned accumulator became higher than authorized pressure, this switch valve can discharge the pressure oil of this high pressure.
4. the fluid pressure drive device of Work machine according to claim 3 is characterized in that,
Above-mentioned Work machine is made of wheel excavator,
The fluid pressure drive device of above-mentioned Work machine possesses sequence valve and switching valve, and the pressure oil of discharging from above-mentioned oil hydraulic pump is fed into this sequence valve and the switching valve,
Be provided with via the oil circuit of said sequence valve to above-mentioned charge valve guide pressure oil,
And, in other oil circuits that connect above-mentioned oil hydraulic pump and said sequence valve, be provided with other filters, in above-mentioned other oil circuits, dispose safety check in the mode that is set up in parallel with above-mentioned other filters, this safety check allows oil from above-mentioned oil hydraulic pump side direction said sequence valve side flow, and stops oil from the above-mentioned oil hydraulic pump side flow of said sequence valve side direction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010248558A JP5481350B2 (en) | 2010-11-05 | 2010-11-05 | Hydraulic drive device for work machine |
| JP2010-248558 | 2010-11-05 | ||
| PCT/JP2011/075078 WO2012060331A1 (en) | 2010-11-05 | 2011-10-31 | Hydraulic drive device for construction machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103201523A true CN103201523A (en) | 2013-07-10 |
| CN103201523B CN103201523B (en) | 2015-05-06 |
Family
ID=46024445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180053096.2A Active CN103201523B (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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711172A (en) * | 2013-12-18 | 2014-04-09 | 广西柳工机械股份有限公司 | Loader four-pump quantitative confluence hydraulic system |
| CN105986595A (en) * | 2015-02-04 | 2016-10-05 | 卡特彼勒（青州）有限公司 | Machine and hydraulic system for machine |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019130451A1 (en) * | 2017-12-26 | 2019-07-04 | 日立建機株式会社 | Work 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 |
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- 2011-10-31 KR KR1020137011676A patent/KR101850570B1/en active IP Right Grant
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103711172A (en) * | 2013-12-18 | 2014-04-09 | 广西柳工机械股份有限公司 | Loader four-pump quantitative confluence hydraulic system |
| 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 |
| CN105986595A (en) * | 2015-02-04 | 2016-10-05 | 卡特彼勒（青州）有限公司 | Machine and hydraulic system for machine |
| CN105986595B (en) * | 2015-02-04 | 2019-10-01 | 卡特彼勒（青州）有限公司 | Hydraulic system and machine for machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012097885A (en) | 2012-05-24 |
| JP5481350B2 (en) | 2014-04-23 |
| EP2636910B1 (en) | 2018-06-20 |
| KR101850570B1 (en) | 2018-04-19 |
| WO2012060331A1 (en) | 2012-05-10 |
| CN103201523B (en) | 2015-05-06 |
| KR20130143581A (en) | 2013-12-31 |
| EP2636910A4 (en) | 2016-07-13 |
| EP2636910A1 (en) | 2013-09-11 |
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