EP3808898A1 - Engin automobile - Google Patents

Engin automobile Download PDF

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Publication number
EP3808898A1
EP3808898A1 EP20194560.7A EP20194560A EP3808898A1 EP 3808898 A1 EP3808898 A1 EP 3808898A1 EP 20194560 A EP20194560 A EP 20194560A EP 3808898 A1 EP3808898 A1 EP 3808898A1
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EP
European Patent Office
Prior art keywords
connection
valve
working
hydraulic
working connection
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
EP20194560.7A
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German (de)
English (en)
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EP3808898B1 (fr
Inventor
Burkhard Frank
Markus Schäfer
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.)
Wirtgen GmbH
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Wirtgen GmbH
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Publication of EP3808898A1 publication Critical patent/EP3808898A1/fr
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Publication of EP3808898B1 publication Critical patent/EP3808898B1/fr
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
    • E01C23/088—Rotary tools, e.g. milling drums
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
    • E01C23/122—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus
    • E01C23/127—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus rotary, e.g. rotary hammers

Definitions

  • the invention relates to a self-propelled construction machine, in particular a road milling machine, stabilizer, recycler or surface miner.
  • the self-propelled construction machines mentioned above have a rotating work roll, which can be a milling or cutting roll.
  • a rotating work roll which can be a milling or cutting roll.
  • damaged road layers can be removed, existing road surfaces reconditioned, the site prepared for road construction or mineral resources extracted.
  • the work roll of the known construction machines is arranged in a roll housing which is open at the bottom and which is closed by a hold-down device arranged in front of the work roll in the working direction and a scraper arranged in the working direction behind the roll.
  • the roller housing is closed by plate-shaped shields that extend in the working direction and are referred to as edge protection.
  • the edge protection of the known construction machines is adjustable in height.
  • a hydraulic system is provided for raising and / or lowering the edge protection.
  • the edge protection stands with its lower edge on the soil surface to be worked.
  • the edge protection exerts a pressure on the floor surface.
  • the edge protection automatically follows the course of the terrain surface, with the edge protection being raised and / or lowered, which is also referred to as floating mounting or floating position.
  • Hydraulic systems for raising and / or lowering the edge protection are state of the art.
  • the known hydraulic systems consist of a large number of components.
  • the invention is based on the object of creating a self-propelled construction machine, in particular a road milling machine, stabilizer, recycler or surface miner, which has a relatively simply constructed and reliably working hydraulic system for raising and / or lowering the edge protection, which has a floating bearing of the edge protection allowed.
  • the self-propelled construction machine in particular road milling machine, stabilizer, recycler or surface miner, has a machine frame, a work roll arranged on the machine frame for processing the soil material and a left edge protection arranged on the left side of the work roll in the working direction and one on the right side in the working direction the right edge protection arranged on the work roll.
  • a hydraulic system is provided which has a hydraulic source for providing hydraulic fluid.
  • the hydraulic system is designed in such a way that the hydraulic source is brought into fluid connection with one of the two cylinder chambers of a first double-acting hydraulic cylinder for lifting and / or lowering the left edge protection and one of the two cylinder chambers of a second double-acting hydraulic cylinder for lifting and / or lowering the right edge protection so that the left and right edge protectors can be raised and / or lowered.
  • Two hydraulic cylinders connected in parallel can also function as double-acting hydraulic cylinders. With two hydraulic cylinders connected in parallel, the hydraulic source is brought into fluid communication with the cylinder chamber of one and the other cylinder.
  • the hydraulic system for raising and lowering the edge protection is characterized in that only a single main directional control valve assigned to the first and second hydraulic cylinder is provided with three switching positions, the one with one first bypass valve with two switching positions, which is assigned to the first hydraulic cylinder, and a second bypass valve with two switching positions, which is assigned to the second hydraulic cylinder, interacts to raise and / or lower the edge protection or to be able to float. Therefore, the hydraulic system has a simple and compact structure.
  • the hydraulic system for raising and lowering the edge protection can also be part of a hydraulic system which, in addition to raising and lowering the edge protection, can also take on other functions.
  • the hydraulic system also includes other components, which, however, have a different function than the movement of the edge protection.
  • the main directional valve can be used in one of the two switching positions of the first or second bypass valve to specify whether hydraulic fluid is applied to one or the other cylinder chamber of the first or second hydraulic cylinder in order to be able to raise and / or lower the edge protection in question. Whether the left edge protection or the right edge protection is lifted or the left and right edge protection is lifted depends on the switching position of the bypass valves. For a floating mounting of the edge protection, a fluid connection between the two cylinder chambers of the hydraulic cylinders can also be specified with the main directional valve in one of the two switching positions of the first or second bypass valve, the two cylinder chambers of the hydraulic cylinders in turn being in fluid connection with the tank.
  • the hydraulic system is designed in such a way that hydraulic fluid can be applied to one of the two cylinder chambers of the two hydraulic cylinders in a first switching position of the main valve and in one of the two switching positions of the first and second bypass valve, and in a second switching position of the main valve and in one of the two Switching positions of the first and second bypass valve, the other of the two cylinder chambers of the two hydraulic cylinders can be acted upon with hydraulic fluid so that the left and / or right edge protection can be raised or lowered, and in a third switching position of the main directional valve and in one of the two switching positions of the first and second bypass valve a fluid connection between the two cylinder chambers of the first hydraulic cylinder with the tank and a fluid connection between the two cylinder chambers of the second hydraulic cylinder with the tank can be established, so that the left and right edge protection one Can assume floating position.
  • the hydraulic system according to the invention has a relatively simple structure.
  • the smaller number of directional control valves also requires fewer hydraulic lines and control lines for controlling the valves, which reduces the manufacturing costs overall.
  • the lower number of directional control valves reduces the risk that a directional control valve fails due to a technical malfunction, which increases the reliability of the hydraulic system.
  • the technical effort for controlling the valves for example the number of electrical control lines, solenoid coils, etc., is also reduced.
  • the main directional valve can be a 4/3-way valve which is preloaded into the central position and which has an inlet connection for supplying hydraulic fluid from the hydraulic source, an outlet connection for discharging hydraulic fluid to the tank, a first working connection and a second working connection.
  • the inlet connection In the middle position, the inlet connection is blocked and the first and second working connection are connected to the outlet connection.
  • the inflow connection is connected to the second working connection and the outflow connection is connected to the first working connection
  • the second end position the inflow connection is connected to the first working connection and the outflow connection is connected to the second working connection.
  • bypass valves are 2/2-way valves preloaded in one of the two switching positions, which have a first working port and have a second working connection, wherein in the first switching position the first working connection and the second working connection are blocked, and in the second switching position the first working connection and the second working connection are connected to one another.
  • the first working port of the main directional valve can be in fluid communication with one of the two cylinder chambers of the first and second hydraulic cylinder
  • the second working port of the main directional valve can be in fluid communication with the first working port of the first auxiliary valve and with the first working port of the second auxiliary valve
  • the second The working connection of the first bypass valve is in fluid communication with the other of the two cylinder chambers of the first hydraulic cylinder
  • the second working connection of the second bypass valve is in fluid communication with the other of the two cylinder chambers of the second hydraulic cylinder.
  • the bypass valves are preferably seat valves that have no leakage, so that the edge protection cannot unintentionally lower itself from an upper locking position due to a leak.
  • the bypass valves are 4/2-way valves which are prestressed in one of the two switching positions and which have a first working connection, a second working connection, a third working connection and a fourth working connection.
  • first switching position the first working port and the third working port are connected to one another and the second working port and the fourth working port are connected to one another
  • second switching position the first working port and the fourth working port are connected to one another and the second working port and the third working port are connected to one another connected.
  • the first working port of the main directional valve can be in fluid communication with one of the two cylinder chambers of the first and second hydraulic cylinder
  • the second working port of the main directional valve can be in fluid communication with the first working port of the first secondary valve
  • a first non-return valve being provided in the flow path, which towards the first auxiliary valve is open
  • the second working connection of the main directional valve are in fluid communication with the first working connection of the second auxiliary valve
  • a second check valve being provided in the flow path, which is open in the direction of the second auxiliary valve.
  • the second working port of the first and second bypass valve is in fluid connection with the drain port of the main directional valve, and the third working port of the first bypass valve is connected to the other of the two cylinder chambers of the first hydraulic cylinder and the third working port of the second bypass valve is connected to the other of the two cylinder chambers of the second hydraulic cylinder in fluid communication.
  • the fourth working port of the first bypass valve and the fourth working port of the second bypass valve are shut off.
  • a third embodiment provides that the bypass valves are 3/2-way valves preloaded in one of the two switching positions, which have a first working connection, a second working connection and a third working connection, the first working connection and the third working connection being connected to one another in the first switching position and the second working connection is blocked, and in the second switching position the first working connection is blocked and the second working connection and the third working connection are connected to one another.
  • the first working port of the main directional valve can be in fluid communication with one of the two cylinder chambers of the first and second hydraulic cylinder and the second working port of the main directional valve can be in fluid communication with the first working port of the first auxiliary valve, a first check valve being provided in the flow path, which is open in the direction of the first secondary valve, and the second working port of the main directional valve are in fluid communication with the first working port of the second secondary valve, with a second check valve being provided in the flow path, which is open in the direction of the second secondary valve.
  • the second working connection of the first and second bypass valve is in fluid communication with the drain connection of the main directional valve, and the third The working port of the first bypass valve is in fluid communication with the other of the two cylinder chambers of the first hydraulic cylinder and the third working port of the second bypass valve is in fluid communication with the other of the two cylinder chambers of the second hydraulic cylinder.
  • the main directional control valve and the bypass valves can be electromagnetically controlled directional control valves, it being possible to provide a control device for controlling the main directional control valve and the bypass valves.
  • This control device can be part of the central control unit of the construction machine, which can also take on other control tasks.
  • the hydraulic source can comprise a hydraulic pump with a suction connection and a pressure connection, wherein the suction connection can be in fluid connection with a hydraulic fluid tank and the pressure connection can be in fluid connection with the inlet connection of the main directional control valve.
  • Another embodiment provides a flow path between the pressure connection of the hydraulic pump and the hydraulic fluid tank, in which a pressure connection valve is provided.
  • a pressure connection valve When the pressure connection valve is open, the hydraulic fluid cannot flow to the inlet connection of the main directional valve, but into the tank, so that the edge protection can assume a floating position when the two hydraulic chambers of the hydraulic cylinder in question are in fluid connection. Raising and / or lowering the edge protection requires that the pressure sequence valve is closed.
  • the pressure connection valve can be coupled to the ignition of the internal combustion engine of the construction machine in such a way that the first and second edge protectors initially assume a floating position after ignition.
  • the pressure switching valve can be an electromagnetically controlled 2/2-way valve which has a first working connection and a second working connection, the pressure switching valve being biased into a switching position in which the first and second working connections are connected to one another.
  • further pressure limiting valves can be provided in order to open a flow path between the inlet connection of the main directional valve and the hydraulic fluid tank or a flow path between the third working connection of the main directional valve and the hydraulic fluid tank when a predetermined excess pressure is exceeded.
  • Fig. 1 shows a side view of a road milling machine as an example of a self-propelled construction machine.
  • the road milling machine is a small milling machine.
  • the construction machine has a machine frame 1 which is supported by a chassis 2.
  • the chassis 2 has a front wheel 3A and two rear wheels 3B. In Fig. 1 only the right rear wheel 3B in working direction A can be seen.
  • the chassis can also have crawler tracks instead of wheels.
  • the construction machine has a work roll, which is a milling drum.
  • Milling drum that cannot be seen is arranged in a milling drum housing 4.
  • the milling drum housing 4 On the left and right-hand side in working direction A, the milling drum housing 4 is each closed by an edge protector.
  • the operator's platform 7 with the driver's seat 7A and the control panel 7B Above the milling drum housing 4 is the operator's platform 7 with the driver's seat 7A and the control panel 7B.
  • the machine frame 1 of the construction machine is adjustable in height on lifting columns 10 relative to the surface 11 of the floor 12.
  • Fig. 2 shows an illustration of the construction machine, the rear right wheel 3B and the rear right lifting column 10 not being shown, so that the right edge protection 5B is exposed.
  • the left and right edge protectors 5A and 5B which have the same structure, are formed by a metal plate that extends in working direction A ( Fig. 3 ).
  • the height of the edge protection relative to the floor surface 11 can be adjusted between stops (not shown).
  • the edge protection 5A, 5B is between the The stops are stored with a slight swing.
  • the height of the edge protection is adjusted with a hydraulic system that has a first double-acting hydraulic cylinder 6A for the left edge protection 5A and a second double-acting hydraulic cylinder 6B for the right edge protection 5B, the cylinders 6AA, 6BA of which are articulated on the machine frame 1 and their pistons 6AB, 6BB are articulated on the edge protection 5A, 5B.
  • the respective edge protection 5A or 5B can be raised or lowered.
  • the hydraulic system for raising and / or lowering the edge protection 5A, 5B provides a floating mounting of the edge protection, in which the edge protection 5A, 5B is pulled over the ground when the construction machine is advanced.
  • the edge protection 5A, 5B rests on the floor surface 11 with a defined pressure force which corresponds to the weight of the edge protection or can be greater or less than the weight.
  • Figure 4A shows the hydraulic circuit diagram of a first embodiment of the hydraulic system, which has a first double-acting hydraulic cylinder 6A for raising or lowering the left edge protection 5A and a second double-acting hydraulic cylinder 6B for raising or lowering the right edge protection 5B. Furthermore, the hydraulic system has a main directional control valve 13 assigned to the first and second hydraulic cylinders 6A, 6B, a first bypass valve 14 assigned to the first hydraulic cylinder 6A, and a second bypass valve 15 assigned to the second hydraulic cylinder 6B. In addition, the hydraulic system has a pressure connection valve 16 and a first pressure limiting valve 17 and a second pressure limiting valve 18.
  • the main directional control valve 13, the two bypass valves 14, 15 and the pressure switching valve 16 are electromagnetically controlled directional control valves which are resiliently biased into a switching position.
  • a Control device 19 is provided, the control outputs of which are connected to the control connections of the directional control valves via control lines (not shown).
  • the hydraulic fluid is provided by a hydraulic source 20, which comprises a hydraulic tank 21 and a hydraulic pump 22, for example a gear pump.
  • the suction connection 22A of the hydraulic pump 22 is connected to the hydraulic tank 21 by a hydraulic line 23, so that the hydraulic pump can suck in hydraulic fluid from the tank.
  • the main directional control valve 13 is an electromagnetic 4/3-way valve which is pretensioned in the central position and which has an inlet connection 13A for supplying hydraulic fluid from the hydraulic source 20, an outlet connection 13B for discharging hydraulic fluid, a first working connection 13C and a second working connection 13D .
  • inlet connection 13A for supplying hydraulic fluid from the hydraulic source 20, an outlet connection 13B for discharging hydraulic fluid, a first working connection 13C and a second working connection 13D .
  • the inlet connection 13A In the middle position shown, the inlet connection 13A is blocked and the first and second working connection 13C, 13D are connected to the outlet connection 13B.
  • the main directional control valve 13 assumes the middle position when no control voltage is applied to the left and right control connections.
  • the inlet connection 13A In the first end position, when a control voltage is applied to the left control connections and the left coil B of the main directional control valve is energized, the inlet connection 13A is connected to the second working connection 13D and the outlet connection 13B is connected to the first working connection 13C, and in the second end position, if if a control voltage is applied to the right control connections and the right coil C is energized, the inlet connection 13A is connected to the first working connection 13C and the outflow connection 13B is connected to the second working connection 13D.
  • the bypass valves 14, 15 are electromagnetic 2/2-way valves which are prestressed in one of the two switching positions and which have a first working port 14A, 15A and a second working port 14B, 15B. In the first switching position, into which the 2/2-way valve is preloaded, the first working connection and the second working connection are blocked, and in the second switching position the first working connection and the second working connection are connected to one another. When the coils D, E of the bypass valves 14, 15 are energized, they switch By-pass valves from the first to the second switching position.
  • the bypass valves 14, 15 are preferably seat valves.
  • the pressure sequence valve 16 is an electromagnetic 2/2-way valve with a first working port 16A and a second working port 16B, which is preloaded into a first switching position in which the first and second working ports 16A, 16B are connected to one another.
  • the pressure connection valve 16 switches from the first to the second switching position in which the working connections 16A, 16B are blocked.
  • the pressure connection valve 16 can also be omitted if the hydraulic cylinders are not supplied with hydraulic fluid by means of a hydraulic pump that has a constant delivery flow, for example a gear pump, but rather by means of an adjustment pump.
  • the pressure connection 22B of the hydraulic pump 22 is connected to the inlet connection 13A of the main directional control valve 13 via an inlet hydraulic line 24, while the outlet connection 13B of the main directional control valve 13 is connected to the hydraulic fluid tank 21 via an outlet hydraulic line 25.
  • the pressure switching valve 16 is arranged in a bypass hydraulic line 26 which connects the inlet hydraulic line 24 to the outlet hydraulic line 25. If no control voltage is applied to the control connections of the pressure connection valve 16 and the coil A is not energized, the pressure connection valve 16 opens the bypass hydraulic line 26 so that the hydraulic fluid circulates. If, on the other hand, a control voltage is applied to the control connections of the pressure connection valve 16, the pressure connection valve 16 closes the bypass hydraulic line 26 so that the hydraulic fluid flows to the inlet connection 13A of the main directional control valve 13.
  • the first working port 13C of the main directional control valve 13 is connected via hydraulic lines 27 to the first, upper hydraulic chamber 6AC or 6BC of the first, left hydraulic cylinder 6A for the left edge protection 5A and the second, right hydraulic cylinder 6B for the right edge protection 5B.
  • the first, lower hydraulic chamber 6AD and 6BD of the first, left hydraulic cylinder 6A and the The second, right hydraulic cylinder 6B is connected to the second working connection 13D of the main valve 13 via hydraulic lines 28.
  • the Main way valve 13 established a fluid connection between the first and second hydraulic chambers 6AC, 6AD of the first hydraulic cylinder 6A and a fluid connection between the first and second hydraulic chambers 6BC, 6BD of the second hydraulic cylinder 6B, so that the left and right edge protectors 5A, 5B are floating.
  • a control voltage is not applied to the control connections of the pressure connection valve 16, so that the hydraulic fluid circulates.
  • Figure 4B shows a table from which the individual functions can be seen.
  • the coil of the pressure switch-on valve is denoted by "A”
  • the pressure switch-on valve being in the second switching position when coil A is energized.
  • the coils of the main directional control valve are denoted by “B” and “C”, the main directional control valve 13 assuming the first switching position when coil B is energized and assumes the second switching position when coil C is energized. If neither of the two coils B and C is energized, the main flow control valve assumes the third, middle switch position.
  • the coil of the first bypass valve 14 is labeled "D”
  • the coil of the second bypass valve 15 is labeled "E”.
  • the first pressure relief valve 17 opens at an adjustable overpressure, for example 200 bar, a flow path from the hydraulic inlet line 24 upstream of the inlet connection 13A of the main valve 13 to the hydraulic outlet line 25.
  • an adjustable overpressure for example 200 bar
  • Hydraulic fluid flow out of the upper chambers of the two hydraulic cylinders 6A, 6B.
  • the first pressure relief valve 17 is used maximum pressure protection for the entire system
  • the second pressure relief valve 18 is used for pressure protection when lowering the edge protection and to avoid an impermissibly high pressure on the piston rod side of the hydraulic cylinder.
  • FIG. 13 shows a second embodiment of the hydraulic system which differs from that with reference to FIG Figures 4A and 4B described embodiment by the first and second bypass valve 29, 30, a first and a second check valve 31, 32 and an additional hydraulic line 33 differs. Only the differences are described below. The parts corresponding to one another are provided with the same reference symbols in the figures.
  • the bypass valves 29, 30 are 4/2-way valves preloaded into one of the two switching positions, which have a first working port 29A, 30A, a second working port 29B, 30B, a third working port 29C, 30C and a fourth working port 29D, 30D have, wherein in the first, non-energized switching position, the first working port and the third working port are connected to one another and the second working port and the fourth working port are connected to one another, and in the second, energized switching position, the first working port with the fourth working port and the second working port is connected to the third working connection.
  • the fourth working connection is closed with a blocked line 29E, 30E.
  • the first check valve 31 is located in one line branch and the second check valve 32 is located in the other line branch of the hydraulic line 33 leading from the second working connection 13D of the main directional valve 13 to the first working connections 29A, 30A of the two bypass valves 29, 30 , 32 are arranged in the hydraulic lines 28 in such a way that they enable a fluid flow through the hydraulic lines 28 from the main way valve 13 to the bypass valves 29, 30 and block it in the opposite direction.
  • main directional control valve 13 If the main directional control valve 13 is in the third, middle switching position and if a control voltage is applied to the bypass valves 29, 30 so that the bypass valves assume the second switching position, a fluid connection is established between the first and second via the main directional control valve 13 and the additional hydraulic line 33 Hydraulic chamber 6AC, 6AD of the first hydraulic cylinder 6A and a fluid connection between the first and second hydraulic chambers 6BC, 6BD of the second hydraulic cylinder established so that the left and right edge protectors 6A, 6B are floating. At this point in time, a control voltage is not applied to the pressure switch-on valve 16, so that the hydraulic fluid circulates.
  • FIG. 13 shows a third embodiment of the hydraulic system which differs from that with reference to FIG Figures 5A and 5B described embodiment differs only by the first and second bypass valve 34, 35. Only the Differences described.
  • the parts corresponding to one another are provided with the same reference symbols in the figures.
  • the bypass valves 34, 35 are 3/2-way valves preloaded in one of the two switching positions, which have a first working port 34A, 35A, a second working port 34B, 35B and a third working port 34C, 35C.
  • the first switching position the first working port 34A, 35A and the third working port 34C, 35C are connected to one another and the second working port 34B, 35B is shut off, and in the second switching position the first working port 34A, 35A is shut off and the second working port 34B, 35B and the third working port 34C, 35C are connected to one another.
  • Figure 6B shows a table from which the individual functions of the third exemplary embodiment can be seen.
  • Figure 4A and 4B the same terms are used again.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
EP20194560.7A 2019-10-15 2020-09-04 Engin automobile Active EP3808898B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019127745.0A DE102019127745A1 (de) 2019-10-15 2019-10-15 Selbstfahrende Baumaschine

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EP3808898A1 true EP3808898A1 (fr) 2021-04-21
EP3808898B1 EP3808898B1 (fr) 2022-03-02

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US (1) US11111640B2 (fr)
EP (1) EP3808898B1 (fr)
CN (1) CN112663470B (fr)
DE (1) DE102019127745A1 (fr)

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Publication number Priority date Publication date Assignee Title
US11660604B2 (en) * 2020-01-23 2023-05-30 Caterpillar Paving Products Inc. Milling machine
US20220186447A1 (en) * 2020-12-15 2022-06-16 Caterpillar Paving Products Inc. Milling Machine with Adjustable Rotor Enclosure

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DE102012015346A1 (de) * 2012-08-06 2014-02-20 Wirtgen Gmbh Selbstfahrende Baumaschine
DE102012012397A1 (de) * 2012-06-25 2014-04-24 Wirtgen Gmbh Selbstfahrende Baumaschine

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US11111640B2 (en) 2021-09-07
CN112663470A (zh) 2021-04-16
CN112663470B (zh) 2022-07-26
US20210108379A1 (en) 2021-04-15
EP3808898B1 (fr) 2022-03-02

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