EP4377576A1 - Hydraulic unit - Google Patents
Hydraulic unitInfo
- Publication number
- EP4377576A1 EP4377576A1 EP22744205.0A EP22744205A EP4377576A1 EP 4377576 A1 EP4377576 A1 EP 4377576A1 EP 22744205 A EP22744205 A EP 22744205A EP 4377576 A1 EP4377576 A1 EP 4377576A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydraulic
- motor
- housing
- hydraulic unit
- channel
- 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.)
- Pending
Links
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 230000017525 heat dissipation Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/18—Combined units comprising both motor and pump
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
-
- 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
-
- 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
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
-
- 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
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/005—With rotary or crank input
- F15B7/006—Rotary pump input
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20561—Type of pump reversible
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20569—Type of pump capable of working as pump and motor
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/27—Directional control by means of the pressure source
-
- 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
- F15B2211/62—Cooling or heating 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
- F15B2211/665—Methods of control using electronic components
- F15B2211/6658—Control using different modes, e.g. four-quadrant-operation, working mode and transportation mode
-
- 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
-
- 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/785—Compensation of the difference in flow rate in closed fluid circuits using differential actuators
Definitions
- the invention relates to a hydraulic unit for providing a pressurized hydraulic fluid for driving a coupled hydraulic actuator.
- a hydraulic unit of the generic type is known.
- EP 2 128446 B1 discloses a hydraulic unit with a motor arranged in a motor housing, a hydraulic accumulator arranged in an accumulator housing and a hydraulic pump arranged in a pump housing, as well as a hydraulic block. These form a rigid module that can be handled uniformly, with hydraulic fluid flowing around in the module partially penetrating all elements of the module in the longitudinal direction.
- the hydraulic fluid flowing around in the module is an accumulator volume flow that can circulate between the hydraulic accumulator and the hydraulic pump.
- a main flow connection is routed past the hydraulic unit between the hydraulic block and the hydraulic actuator.
- the invention is based on the object of creating a hydraulic unit of the generic type which is of compact design and allows improved cooling of the motor.
- this object is achieved by a hydraulic unit having the features specified in claim 1. Because at least one main flow connection between the hydraulic pump and the actuator that can be subjected to high pressure is routed through at least one channel of the motor, it is advantageously possible to achieve very effective cooling of the motor by flowing the main pump volume flow through the channel of the main flow connection in the motor. A maximum of heat transfer between the engine components of the engine and the housing is thus achieved. The heat can then be effectively dissipated to the outside environment via the housing.
- high pressure is understood to mean the load pressure or working pressure of the hydraulic pump for loading the actuator.
- the main current connection through the motor is a forward flow or a reverse flow. In this way, it is advantageously achieved that, depending on the actuation of the hydraulic actuator coupled to the hydraulic unit, the greatest possible volume flow is conducted through the motor. This also allows the greatest possible heat dissipation out of the engine and thus cooling of the engine components.
- the main flow connection is the forward flow or the return flow, depending on the direction of rotation of the hydraulic pump.
- the hydraulic pump is a pump that can be operated in four-quadrant mode, which allows delivery and recuperation in two directions.
- the hydraulic unit is advantageous to combine the hydraulic unit with a four-quadrant hydraulic pump known per se, via which the flow direction of the main volume flow can then be changed in a simple manner according to the direction of rotation. This results in a very advantageous combination of the channel of the main flow connection in the engine, which can serve as a forward or reverse flow.
- the at least one channel is routed through a motor housing of the motor.
- the at least one channel can be integrated in a simple manner and particularly good heat dissipation can be achieved.
- the at least one duct of the motor housing for the main current connection comprises a wall that comes into direct contact with the outside of the motor housing.
- the at least one channel is routed through the motor housing in a meandering and/or spiral shape.
- This very advantageously achieves the largest possible contact surface between the medium of the hydraulic fluid and the motor housing. This enables heat dissipation to be particularly effective.
- the heat flow is distributed evenly over the entire surface of the motor housing in order to avoid hot spots on the motor and thermal stress caused by uneven temperature distribution.
- power electronics for controlling the motor can also be cooled by the main volume flow.
- the power electronics can be directly thermally conductively coupled to the motor housing, which is cooled by the main volume flow. It is also conceivable to direct the main volume flow directly through corresponding channels provided in a housing of the power electronics. This is particularly advantageous when the power electronics cannot be arranged directly on the motor housing for structural reasons.
- an accumulator volume flow is routed between an accumulator housing and the hydraulic pump through a channel of the engine that is separate from the main volume flow.
- the accumulator volume flow can be used for additional cooling of the engine components.
- the hydraulic accumulator includes an intermediate chamber which is flanged to the motor housing or is formed with it, which has a large surface area to the surroundings.
- the accumulator volume flow flows through the intermediate chamber between motor and accumulator in only one direction via a check valve, depending on the direction of accumulator flow.
- Figure 1 shows a hydraulic unit according to the invention in a first switching state
- FIG. 2 shows the hydraulic unit according to the invention in a second switching state.
- FIG. 1 shows a schematic sectional illustration of a hydraulic unit designated 10 overall. This is used to supply a hydraulic actuator 12 with a pressurized hydraulic fluid.
- the actuator 12 has a housing 14 within which a piston 16 is linearly displaceable.
- the piston 16 is guided in the housing 14 via a seal 18 in a sealing manner.
- a sealing element 20 connected to the piston 16 divides the housing 14 into two separate chambers 22 and 24 .
- the piston 16 is moved out of the housing 14 or into it. This makes it possible to exert an actuating movement with the piston 16 .
- the specific position of the piston 16 can be determined via a displacement sensor.
- the hydraulic unit 10 includes a motor 30 which is arranged in a motor housing 28 and has a stator 32 and a rotor 34 .
- the motor 30 is operatively connected to a hydraulic pump 36 .
- the hydraulic pump 36 is designed as a pump that can be operated in four-quadrant mode.
- the structure and mode of operation of motor 30 with an operatively connected hydraulic pump 36 and coupled hydraulic block 38 are also fundamentally known to those skilled in the art, so that they will not be discussed in detail in the context of the description of the invention.
- the hydraulic unit 10 is also assigned a hydraulic accumulator 40 which includes an intermediate chamber 42 which is flanged to the motor housing 28 or is formed with it.
- Actuator 12 motor housing 28, hydraulic pump 36, hydraulic block 38 and accumulator 40 are fluidically connected to one another in the manner explained below.
- At least one channel 44 is guided through the motor housing 28 and forms a main flow connection for the main volume flow of the hydraulic pump 36 to the actuator 12 .
- the passage 44 is formed within the motor housing 28 to be proximate to an outer shell 46 of the motor housing 28 .
- An inner wall of the channel 44 is therefore directly adjacent to the outer wall 46 of the motor housing 28.
- the channel 44 can be branched within the motor housing 28 . This can meander and/or spiral along the motor housing 28 in its longitudinal direction. This can also be branched, so that several partial channels of the channel 44 extend in parallel over the circumference of the motor housing 28 . In any case, the channel 44 has an input side 48 facing the hydraulic pump 36 and an output side 50 at its opposite end.
- a connector 52 extends from the outlet 50 to an inlet 54 into the chamber 24 of the actuator 12.
- the chamber 22 of the actuator 12 is connected to the hydraulic pump 36 via a connection 56 .
- the connection 56 is guided through the hydraulic block 38 and a fastening section 58 .
- Fastening section 58 serves to mechanically fasten the entire device consisting of hydraulic unit 10 and actuator 12.
- Both the channel 44 with connector 52 and the connection 56 form main flow connections for a main volume flow of the hydraulic pump 36.
- the channel 44 is a supply and the connection 56 is a return of the hydraulic unit 10.
- the channel 44 is the return and the connection 56 is the supply.
- a switching state of the hydraulic unit 10 is shown in FIG. 1, in which the piston 16 is moved into the housing 14 of the actuator 12 . This means that in the chamber 24 of the housing 14 there is a higher pressure than in the chamber 22.
- the channel 44 with its connecting piece 52 is the flow for the hydraulic unit 10 in this switching state.
- the hydraulic fluid present in the chamber 22 is displaced and via the Connection 56 transferred to the hydraulic unit 10.
- the connection 56 is therefore the return of the hydraulic unit 10 in this switching state.
- the main volume flow of the hydraulic pump 36 which is conducted through the channel 44 (or the system of channels 44) in the motor housing 28, contributes to effective and maximum cooling of the motor 30, in which the heat emitted by the motor 30 is absorbed and via the outer circumference of the motor housing 28 is released to the environment.
- the hydraulic unit 10 is also assigned the hydraulic accumulator 40 into which the hydraulic fluid is returned. Due to the displacement of the hydraulic fluid into the housing 14 of the actuator 12 (according to the retraction situation in Figure 1 from the chamber 22), this must be returned to the hydraulic accumulator 40, from which the hydraulic pump 36 then builds up the pressure for the advance of the main volume flow.
- the intermediate chamber 42 is assigned to the hydraulic accumulator 40 . This is formed by a cavity 64 formed within a housing 62 .
- This accumulator volume flow (return of the hydraulic fluid) is guided through a rotor shaft 65 of the rotor 34 within the motor 30 .
- This is designed as a hollow shaft for this purpose.
- An intermediate channel 66 between the rotor shaft (hollow shaft) 65 opens into the intermediate chamber 42.
- the intermediate chamber 42 has a lance-like guide 68, which causes the storage volume flow within the cavity 64 of the intermediate chamber 42 to be guided in a predetermined manner.
- the storage volume flow is thus swirled within the intermediate chamber 42 and guided along the housing of the intermediate chamber 42 . This results in improved heat dissipation through forced convection on the relatively large available surface of the inner wall of the intermediate chamber 42 via the housing 62 to the Vicinity. This is indicated by a heat dissipation indicator 70.
- the connecting piece 52 between the channel 44 and the housing 14 is guided on the outer casing of the intermediate chamber 42 .
- the hydraulic unit 10 is assigned to a control unit, not shown in detail, via which the motor 30 and thus the delivery capacity of the hydraulic pump 36 can be controlled.
- the distance sensor is connected to the control unit via signal lines.
- the hydraulic block 38 can include electrically controllable valves, which are also connected to the control device for regulation and/or control purposes.
- the configuration of the hydraulic unit 10 according to the invention enables effective and maximum heat dissipation, so that the motor 30 can be optimally cooled.
- the main volume flow can also be routed directly through the interior of the motor 30 .
- the main volume flow can also be routed directly through the interior of the motor 30 .
- the main volume flow can also be routed directly through the interior of the motor 30 .
- FIG. 2 shows a switching state of the hydraulic unit 10 in which the piston 16 of the actuator 12 is extended out of the housing 14.
- the accumulator volume flow flows through the intermediate chamber between the motor and accumulator in only one direction via a check valve, depending on the accumulator flow direction, as shown for example in FIG.
- the motor is designed as a separate component with the motor housing. This means that the motor is not directly connected to the hydraulic pump and/or the buffer store and/or the hydraulic block and/or the power electronics.
- the duct of the main flow connection for cooling the motor is also routed through the motor housing in these design variants.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Reciprocating Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a hydraulic unit (10) for providing a pressurized hydraulic fluid for driving a coupled hydraulic actuator (12), comprising: - a motor (30) which is disposed in a motor housing (28); - a hydraulic accumulator (40) which is disposed in an accumulator housing; - a hydraulic pump (36) which is disposed in a hydraulic housing; and - a hydraulic block (38); wherein the motor housing (28), the accumulator housing and the hydraulic housing are fluidically interconnected. According to the invention, at least one main flow connection between the hydraulic pump (36) and the actuator (12) is led through at least one channel (44) of the motor housing (28).
Description
Hydraulikeinheit hydraulic unit
Die Erfindung betrifft eine Hydraulikeinheit zur Bereitstellung einer unter Druck stehenden Hydraulikflüssigkeit zum Antrieb eines angekoppelten hydraulischen Aktuators. The invention relates to a hydraulic unit for providing a pressurized hydraulic fluid for driving a coupled hydraulic actuator.
Eine Hydraulikeinheit der gattungsgemäßen Art ist bekannt. A hydraulic unit of the generic type is known.
So offenbart EP 2 128446 B1 eine Hydraulikeinheit mit einem in einem Motorgehäuse angeordneten Motor, einem in einem Speichergehäuse angeordneten Hydraulikspeicher und einer in einem Pumpengehäuse angeordneten Hydraulikpumpe sowie einem Hydraulikblock. Diese bilden ein einheitlich handhabbares starres Modul, wobei in dem Modul umströmende Hydraulikflüssigkeit alle Elemente des Moduls in Längsrichtung bereichsweise durchsetzt. Die in dem Modul umströmende Hydraulikflüssigkeit ist ein Speichervolumenstrom, der zwischen dem Hydraulikspeicher und der Hydraulikpumpe zirkulieren kann. Eine Hauptstromverbindung ist an der Hydraulikeinheit vorbei zwischen dem Hydraulikblock und dem hydraulischen Aktuator geführt. Thus, EP 2 128446 B1 discloses a hydraulic unit with a motor arranged in a motor housing, a hydraulic accumulator arranged in an accumulator housing and a hydraulic pump arranged in a pump housing, as well as a hydraulic block. These form a rigid module that can be handled uniformly, with hydraulic fluid flowing around in the module partially penetrating all elements of the module in the longitudinal direction. The hydraulic fluid flowing around in the module is an accumulator volume flow that can circulate between the hydraulic accumulator and the hydraulic pump. A main flow connection is routed past the hydraulic unit between the hydraulic block and the hydraulic actuator.
Der Erfindung liegt die Aufgabe zugrunde, eine Hydraulikeinheit der gattungsgemäßen Art zu schaffen, die kompakt aufgebaut ist und eine verbesserte Kühlung des Motors gestattet. The invention is based on the object of creating a hydraulic unit of the generic type which is of compact design and allows improved cooling of the motor.
Erfindungsgemäß wird diese Aufgabe durch eine Hydraulikeinheit mit den in Anspruch 1 genannten Merkmalen gelöst. Dadurch, dass zumindest eine hochdruckbeaufschlagbare Hauptstromverbindung zwischen der Hydraulikpumpe und dem Aktuator durch mindestens einen Kanal des Motors geführt ist, ist vorteilhaft möglich, über die Durchströmung des Pumpenhauptvolumenstromes durch den Kanal der Hauptstromverbindung in dem Motor eine sehr effektive Kühlung des Motors zu erreichen. Es wird somit ein Maximum an Wärmeübertragung zwischen den Motorkomponenten des Motors und dem Gehäuse erzielt. Die Wärme kann dann über das Gehäuse an die äußere Umgebung effektiv abgeführt werden. Unter Hochdruck wird im Sinne der Erfindung der Lastdruck beziehungsweise Arbeitsdruck der Hydraulikpumpe zur Beaufschlagung des Aktuators verstanden. According to the invention, this object is achieved by a hydraulic unit having the features specified in claim 1. Because at least one main flow connection between the hydraulic pump and the actuator that can be subjected to high pressure is routed through at least one channel of the motor, it is advantageously possible to achieve very effective cooling of the motor by flowing the main pump volume flow through the channel of the main flow connection in the motor. A maximum of heat transfer between the engine components of the engine and the housing is thus achieved. The heat can then be effectively dissipated to the outside environment via the housing. In the context of the invention, high pressure is understood to mean the load pressure or working pressure of the hydraulic pump for loading the actuator.
In bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass die Hauptstromverbindung durch den Motor ein Vorlauf oder ein Rücklauf ist. Hierdurch wird vorteilhaft erreicht, dass je nach Ansteuerung des mit der Hydraulikeinheit gekoppelten hydraulischen Aktuators der größtmögliche Volumenstrom durch den Motor geführt wird. Hierdurch kann auch die größtmögliche Wärmeabfuhr
aus dem Motor und somit Kühlung der Motorkomponenten erfolgen. In a preferred embodiment of the invention, it is provided that the main current connection through the motor is a forward flow or a reverse flow. In this way, it is advantageously achieved that, depending on the actuation of the hydraulic actuator coupled to the hydraulic unit, the greatest possible volume flow is conducted through the motor. This also allows the greatest possible heat dissipation out of the engine and thus cooling of the engine components.
In weiterer bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass die Hauptstromverbindung in Abhängigkeit einer Drehrichtung der Hydraulikpumpe der Vorlauf oder der Rücklauf ist. Hierdurch wird vorteilhaft möglich, dass ein und derselbe Kanal der hochdruckbeaufschlagbaren Hauptstromverbindung durch den Motor je nach Drehrichtung der Hydraulikpumpe als Vorlauf oder als Rücklauf geschaltet ist. Somit wird in jedem Fall sichergestellt, dass der größtmögliche Volumenstrom durch den Motor fließt und zur Kühlung der Motorkomponenten zur Verfügung steht. In another preferred embodiment of the invention, it is provided that the main flow connection is the forward flow or the return flow, depending on the direction of rotation of the hydraulic pump. This advantageously makes it possible for one and the same channel of the main flow connection that can be subjected to high pressure to be switched by the engine as a forward flow or as a return flow, depending on the direction of rotation of the hydraulic pump. This ensures in any case that the greatest possible volume flow flows through the motor and is available for cooling the motor components.
In weiterer bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass die Hydraulikpumpe eine im Vierquadrantenmodus betreibbare Pumpe ist, die eine Förderung und Rekuperation in zwei Richtungen erlaubt. Hierdurch ist vorteilhaft die Hydraulikeinheit mit einer an sich bekannten Vierquadranten-Hydraulikpumpe zu kombinieren über die dann in einfacherWeise entsprechend der Drehrichtung der Hauptvolumenstrom in seiner Fließrichtung geändert werden kann. Hierdurch ergibt sich eine sehr vorteilhafte Kombination des Kanales der Hauptstromverbindung im Motor, der als Vorlauf oder Rücklauf dienen kann. In another preferred embodiment of the invention, it is provided that the hydraulic pump is a pump that can be operated in four-quadrant mode, which allows delivery and recuperation in two directions. As a result, it is advantageous to combine the hydraulic unit with a four-quadrant hydraulic pump known per se, via which the flow direction of the main volume flow can then be changed in a simple manner according to the direction of rotation. This results in a very advantageous combination of the channel of the main flow connection in the engine, which can serve as a forward or reverse flow.
Bevorzugt ist erfindungsgemäß vorgesehen, dass der wenigstens eine Kanal durch ein Motorgehäuse des Motors geführt ist. Hierdurch lässt sich in einfacher weise der wenigstens eine Kanal integrieren und eine besonders gute Wärmeabfuhr erreichen. It is preferably provided according to the invention that the at least one channel is routed through a motor housing of the motor. As a result, the at least one channel can be integrated in a simple manner and particularly good heat dissipation can be achieved.
In weiterer bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass der wenigstens eine Kanal des Motorgehäuses für die Hauptstromverbindung eine direkt mit der Außenseite des Motorgehäuses in Kontakt kommende Wandung umfasst. Hierdurch wird in besonders vorteilhafter Weise eine Abführung der Wärme der Motorkomponenten über das Medium der Hydraulikflüssigkeit an die Außenseite des Motorgehäuses und damit in die Umgebung möglich. In a further preferred embodiment of the invention, it is provided that the at least one duct of the motor housing for the main current connection comprises a wall that comes into direct contact with the outside of the motor housing. This makes it possible, in a particularly advantageous manner, for the heat from the motor components to be dissipated via the medium of the hydraulic fluid to the outside of the motor housing and thus to the environment.
Darüber hinaus ist in bevorzugter Ausgestaltung der Erfindung vorgesehen, dass der mindestens eine Kanal mäanderförmig und/oder spiralförmig durch das Motorgehäuse geführt ist. Hierdurch wird sehr vorteilhaft eine möglichst große Kontaktfläche zwischen dem Medium der Hydraulikflüssigkeit und dem Motorgehäuse erzielt. Die Wärmeabführung ist hiermit besonders effektiv möglich. Es wird der Wärmestrom gleichmäßig über die gesamte Oberfläche des Motorgehäuses verteilt abgegeben, um Hot Spots am Motor und thermische Spannungen durch ungleichmäßige Temperaturverteilungen zu vermeiden.
In bevorzugter Ausgestaltung der Erfindung ist ferner vorgesehen, dass eine Leistungselektronik zur Ansteuerung des Motors ebenfalls durch den Hauptvolumenstrom gekühlt werden kann. Hierzu kann die Leistungselektronik unmittelbar mit dem vom Hauptvolumenstrom gekühlten Motorgehäuse wärmeleitfähig gekoppelt sein. Denkbar ist auch, den Hauptvolumenstrom unmittelbar durch entsprechende in einem Gehäuse der Leistungselektronik vorgesehene Kanäle zu führen. Dies ist vor allem dann vorteilhaft, wenn die Leistungselektronik aus konstruktiven Gründen nicht unmittelbar am Motorgehäuse angeordnet werden kann. In addition, in a preferred embodiment of the invention, it is provided that the at least one channel is routed through the motor housing in a meandering and/or spiral shape. This very advantageously achieves the largest possible contact surface between the medium of the hydraulic fluid and the motor housing. This enables heat dissipation to be particularly effective. The heat flow is distributed evenly over the entire surface of the motor housing in order to avoid hot spots on the motor and thermal stress caused by uneven temperature distribution. In a preferred embodiment of the invention, it is also provided that power electronics for controlling the motor can also be cooled by the main volume flow. For this purpose, the power electronics can be directly thermally conductively coupled to the motor housing, which is cooled by the main volume flow. It is also conceivable to direct the main volume flow directly through corresponding channels provided in a housing of the power electronics. This is particularly advantageous when the power electronics cannot be arranged directly on the motor housing for structural reasons.
Darüber hinaus ist in weiterer bevorzugter Ausgestaltung der Erfindung vorgesehen, dass ein Speichervolumenstrom zwischen einem Speichergehäuse und der Hydraulikpumpe durch einen vom Hauptvolumenstrom getrennten Kanal des Motors geführt ist. Hierdurch kann der Speichervolumenstrom für eine zusätzliche Kühlung der Motorkomponenten genutzt werden. Furthermore, in a further preferred embodiment of the invention, it is provided that an accumulator volume flow is routed between an accumulator housing and the hydraulic pump through a channel of the engine that is separate from the main volume flow. As a result, the accumulator volume flow can be used for additional cooling of the engine components.
Bevorzugt ist vorgesehen, dass der Kanal für den Speichervolumenstrom durch eine Rotorwelle des Motors geführt ist, die vorzugsweise als Hohlwelle ausgebildet ist. Hierdurch kann auf direktem Wege eine Fluidverbindung für einen Speichervolumenstrom geschaffen werden. Provision is preferably made for the channel for the storage volume flow to be guided through a rotor shaft of the motor, which is preferably designed as a hollow shaft. As a result, a fluid connection for a storage volume flow can be created directly.
Ferner ist in bevorzugter Ausgestaltung der Erfindung vorgesehen, dass der Hydraulikspeicher eine Zwischenkammer umfasst, die an dem Motorgehäuse angeflanscht ist oder mit diesem ausgebildet ist, die eine große Oberfläche zur Umgebung aufweist. Hierdurch kann über die Zwischenkammer eine weiter verbesserte Wärmeabgabe durch erzwungene Konvektion an der Oberfläche in die Umgebung erzielt werden. Furthermore, in a preferred embodiment of the invention, it is provided that the hydraulic accumulator includes an intermediate chamber which is flanged to the motor housing or is formed with it, which has a large surface area to the surroundings. As a result, a further improved heat dissipation can be achieved via the intermediate chamber through forced convection on the surface into the environment.
Darüber hinaus ist erfindungsgemäß vorgesehen, dass der Speichervolumenstrom überein Rückschlagventil Speicherstromrichtungsabhängig die Zwischenkammer zwischen Motor und Speicher nur in einer Richtung durchströmt. Hierdurch wird vorteilhaft die optimale Nutzung der Zwischenkammer zur Wärmeabgabe an die Umgebung genutzt werden. In addition, it is provided according to the invention that the accumulator volume flow flows through the intermediate chamber between motor and accumulator in only one direction via a check valve, depending on the direction of accumulator flow. As a result, the optimal use of the intermediate chamber for dissipating heat to the environment is advantageously used.
Weitere bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den übrigen in den Unteransprüchen genannten Merkmalen. Further preferred configurations of the invention result from the other features mentioned in the subclaims.
Die Erfindung wird nachfolgend in einem Ausführungsbeispiel anhand der zugehörigen Zeichnungen näher erläutert.
Es zeigen: The invention is explained in more detail below in an exemplary embodiment with reference to the associated drawings. Show it:
Figur 1 eine erfindungsgemäße Hydraulikeinheit in einem ersten Schaltzustand und Figure 1 shows a hydraulic unit according to the invention in a first switching state and
Figur 2 die erfindungsgemäße Hydraulikeinheit in einem zweiten Schaltzustand. FIG. 2 shows the hydraulic unit according to the invention in a second switching state.
Figur 1 zeigt eine schematische Schnittdarstellung einer insgesamt mit 10 bezeichneten Hydraulikeinheit. Diese dient der Versorgung eines hydraulischen Aktuators 12 mit einer unter Druck stehenden Hydraulikflüssigkeit. Der Aktuator 12 besitzt ein Gehäuse 14 innerhalb dem ein Kolben 16 linear verschiebbar ist. Der Kolben 16 ist in dem Gehäuse 14 übereine Dichtung 18 dichtend geführt. Ein mit dem Kolben 16 verbundenes Dichtelement 20 teilt das Gehäuse 14 in zwei voneinander getrennte Kammern 22 sowie 24 auf. Je nach Druckdifferenz zwischen den Kammern 22 und 24 wird der Kolben 16 aus dem Gehäuse 14 heraus oder in dieses hineinbewegt. Hierdurch ist möglich, mit dem Kolben 16 eine Stellbewegung auszuüben. Die konkrete Stellung des Kolbens 16 ist über einen Wegsensor ermittelbar. FIG. 1 shows a schematic sectional illustration of a hydraulic unit designated 10 overall. This is used to supply a hydraulic actuator 12 with a pressurized hydraulic fluid. The actuator 12 has a housing 14 within which a piston 16 is linearly displaceable. The piston 16 is guided in the housing 14 via a seal 18 in a sealing manner. A sealing element 20 connected to the piston 16 divides the housing 14 into two separate chambers 22 and 24 . Depending on the pressure difference between the chambers 22 and 24, the piston 16 is moved out of the housing 14 or into it. This makes it possible to exert an actuating movement with the piston 16 . The specific position of the piston 16 can be determined via a displacement sensor.
Aufbau und Wirkungsweise eines derartigen Aktuators 12 sind grundsätzlich bekannt. The structure and mode of operation of such an actuator 12 are known in principle.
Weiter wird auf Aufbau und Funktion der erfindungsgemäßen Hydraulikeinheit 10 zur Ansteuerung des Aktuators 12 näher eingegangen. The structure and function of the hydraulic unit 10 according to the invention for controlling the actuator 12 will also be discussed in more detail.
Die Hydraulikeinheit 10 umfasst einen in einem Motorgehäuse 28 angeordneten Motor 30, der einen Stator 32 sowie einen Rotor 34 besitzt. The hydraulic unit 10 includes a motor 30 which is arranged in a motor housing 28 and has a stator 32 and a rotor 34 .
Der Motor 30 ist mit einer Hydraulikpumpe 36 wirkverbunden. Die Hydraulikpumpe 36 ist als eine im Vierquadrantenmodus betreibbare Pumpe ausgebildet. An der dem Motor 30 abgewandten Seite der Hydraulikpumpe 36 schließt sich ein Hydraulikblock 38 an, innerhalb dem hier im Einzelnen nicht dargestellte Ventile zur Steuerung eines mittels der Hydraulikpumpe 36 erzeugten Volumenstromes einer Hydraulikflüssigkeit erfolgt. The motor 30 is operatively connected to a hydraulic pump 36 . The hydraulic pump 36 is designed as a pump that can be operated in four-quadrant mode. On the side of the hydraulic pump 36 facing away from the motor 30, there is a hydraulic block 38, within which valves (not shown here in detail) for controlling a volume flow of a hydraulic fluid generated by the hydraulic pump 36 take place.
Aufbau und Wirkungsweise von Motor 30 mit wirkverbundener Hydraulikpumpe 36 und angekoppeltem Hydraulikblock 38 sind dem Fachmann ebenfalls grundsätzlich bekannt, so dass hierauf im Rahmen der Beschreibung der Erfindung nicht im Einzelnen eingegangen wird.
Der Hydraulikeinheit 10 ist noch ein Hydraulikspeicher 40 zugeordnet, der eine Zwischenkammer 42 umfasst, die an dem Motorgehäuse 28 angeflanscht ist oder mit diesem ausgebildet ist. The structure and mode of operation of motor 30 with an operatively connected hydraulic pump 36 and coupled hydraulic block 38 are also fundamentally known to those skilled in the art, so that they will not be discussed in detail in the context of the description of the invention. The hydraulic unit 10 is also assigned a hydraulic accumulator 40 which includes an intermediate chamber 42 which is flanged to the motor housing 28 or is formed with it.
Aktuator 12, Motorgehäuse 28, Hydraulikpumpe 36, Hydraulikblock 38 und Speicher 40 sind fluidtechnisch miteinander in der nachfolgend erläuterten Art und Weise verbunden. Actuator 12, motor housing 28, hydraulic pump 36, hydraulic block 38 and accumulator 40 are fluidically connected to one another in the manner explained below.
Durch das Motorgehäuse 28 ist wenigstens ein Kanal 44 geführt, der eine Hauptstromverbindung für den Hauptvolumenstrom der Hydraulikpumpe 36 zu dem Aktuator 12 bildet. At least one channel 44 is guided through the motor housing 28 and forms a main flow connection for the main volume flow of the hydraulic pump 36 to the actuator 12 .
Der Kanal 44 ist innerhalb des Motorgehäuses 28 so ausgebildet, dass er nahe an einem Außenmantel 46 des Motorgehäuses 28 angeordnet ist. Eine Innenwandung des Kanals 44 liegt also unmittelbar benachbart zu der Außenwandung 46 des Motorgehäuses 28. The passage 44 is formed within the motor housing 28 to be proximate to an outer shell 46 of the motor housing 28 . An inner wall of the channel 44 is therefore directly adjacent to the outer wall 46 of the motor housing 28.
Der Kanal 44 kann innerhalb des Motorgehäuses 28 verzweigt ausgebildet sein. Dieser kann sich entlang des Motorgehäuses 28 in dessen Längsrichtung mäanderförmig und/oder spiralförmig erstrecken. Auch kann dieser verzweigt ausgebildet sein, so dass mehrere Teilkanäle des Kanals 44 sich über den Umfang des Motorgehäuses 28 parallel erstrecken. In jedem Fall besitzt der Kanal 44 eine der Hydraulikpumpe 36 zugewandte Eingangsseite 48 und an seinem gegenüberliegenden Ende einen Ausgangsseite 50. The channel 44 can be branched within the motor housing 28 . This can meander and/or spiral along the motor housing 28 in its longitudinal direction. This can also be branched, so that several partial channels of the channel 44 extend in parallel over the circumference of the motor housing 28 . In any case, the channel 44 has an input side 48 facing the hydraulic pump 36 and an output side 50 at its opposite end.
Vom Ausgang 50 erstreckt sich ein Verbindungsstück 52 zu einem Einlass 54 in die Kammer 24 des Aktuators 12. A connector 52 extends from the outlet 50 to an inlet 54 into the chamber 24 of the actuator 12.
Die Kammer 22 des Aktuators 12 ist über eine Verbindung 56 mit der Hydraulikpumpe 36 verbunden. Die Verbindung 56 ist hierbei durch den Hydraulikblock 38 und einen Befestigungsabschnitt 58 geführt. Der Befestigungsabschnitt 58 dient der mechanischen Befestigung der gesamten Vorrichtung aus Hydraulikeinheit 10 und Aktuator 12. The chamber 22 of the actuator 12 is connected to the hydraulic pump 36 via a connection 56 . In this case, the connection 56 is guided through the hydraulic block 38 and a fastening section 58 . Fastening section 58 serves to mechanically fasten the entire device consisting of hydraulic unit 10 and actuator 12.
Sowohl der Kanal 44 mit Verbindungsstück 52 als auch die Verbindung 56 bilden Hauptstromverbindungen für einen Hauptvolumenstrom der Hydraulikpumpe 36. Both the channel 44 with connector 52 and the connection 56 form main flow connections for a main volume flow of the hydraulic pump 36.
Je nach Betriebsweise der Hydraulikpumpe 36, das hießt je nach Drehrichtung, ist der Kanal 44 ein Vorlauf und die Verbindung 56 ein Rücklauf der Hydraulikeinheit 10. Bei einer Drehrichtungsumkehr der Hydraulikpumpe 36 ist der Kanal 44 der Rücklauf und die Verbindung 56 der Vorlauf.
In Figur 1 ist ein Schaltzustand der Hydraulikeinheit 10 gezeigt, bei der der Kolben 16 in das Gehäuse 14 des Aktuators 12 eingefahren wird. Dies bedeutet, in der Kammer 24 des Gehäuses 14 herrscht ein größerer Druck als in der Kammer 22. Der Kanal 44 mit seinem Verbindungsstück 52 ist in diesem Schaltzustand der Vorlauf für die Hydraulikeinheit 10. Die in der Kammer 22 vorhandene Hydraulikflüssigkeit wird verdrängt und über die Verbindung 56 in die Hydraulikeinheit 10 überführt. Die Verbindung 56 ist somit in diesem Schaltzustand der Rücklauf der Hydraulikeinheit 10. Depending on the mode of operation of the hydraulic pump 36, i.e. depending on the direction of rotation, the channel 44 is a supply and the connection 56 is a return of the hydraulic unit 10. When the direction of rotation of the hydraulic pump 36 is reversed, the channel 44 is the return and the connection 56 is the supply. A switching state of the hydraulic unit 10 is shown in FIG. 1, in which the piston 16 is moved into the housing 14 of the actuator 12 . This means that in the chamber 24 of the housing 14 there is a higher pressure than in the chamber 22. The channel 44 with its connecting piece 52 is the flow for the hydraulic unit 10 in this switching state. The hydraulic fluid present in the chamber 22 is displaced and via the Connection 56 transferred to the hydraulic unit 10. The connection 56 is therefore the return of the hydraulic unit 10 in this switching state.
Angedeutet ist dies durch die Pfeilrichtungen des Hauptvolumenstromes der Hydraulikflüssigkeit. This is indicated by the direction of the arrows of the main volume flow of the hydraulic fluid.
Der Hauptvolumenstrom der Hydraulikpumpe 36 der durch den Kanal 44 (beziehungsweise das System von Kanälen 44) im Motorgehäuse 28 geführt ist, trägt zu einer effektiven und maximalen Kühlung des Motors 30 bei, in dem die vom Motor 30 abgegebenen Wärme aufgenommen wird und über den Außenumfang des Motorgehäuses 28 an die Umgebung abgegeben wird. The main volume flow of the hydraulic pump 36, which is conducted through the channel 44 (or the system of channels 44) in the motor housing 28, contributes to effective and maximum cooling of the motor 30, in which the heat emitted by the motor 30 is absorbed and via the outer circumference of the motor housing 28 is released to the environment.
Angedeutet ist dies durch einen Wärmepfeil 60 im Bereich des Motorgehäuses 28. This is indicated by a thermal arrow 60 in the area of the motor housing 28.
Der Hydraulikeinheit 10 ist ferner der Hydraulikspeicher 40 zugeordnet, in den eine Rückführung der Hydraulikflüssigkeit erfolgt. Durch die Verdrängung der Hydraulikflüssigkeit in das Gehäuse 14 des Aktuators 12 (gemäß der Einfahrsituation in Figur 1 aus der Kammer 22) muss dieses in den Hydraulikspeicher 40 rückgeführt werden, aus dem heraus dann die Hydraulikpumpe 36 den Druck für den Vorlauf des Hauptvolumenstromes aufbaut. The hydraulic unit 10 is also assigned the hydraulic accumulator 40 into which the hydraulic fluid is returned. Due to the displacement of the hydraulic fluid into the housing 14 of the actuator 12 (according to the retraction situation in Figure 1 from the chamber 22), this must be returned to the hydraulic accumulator 40, from which the hydraulic pump 36 then builds up the pressure for the advance of the main volume flow.
Dem Hydraulikspeicher 40 ist die Zwischenkammer 42 zugeordnet. Diese wird von einem innerhalb eines Gehäuses 62 ausgebildeten Hohlraumes 64 gebildet. The intermediate chamber 42 is assigned to the hydraulic accumulator 40 . This is formed by a cavity 64 formed within a housing 62 .
Innerhalb des Motors 30 wird dieser Speichervolumenstrom (Rückführung der Hydraulikflüssigkeit) durch eine Rotorwelle 65 des Rotors 34 geführt. Diese ist hierzu als Hohlwelle ausgebildet. Ein Zwischenkanal 66 zwischen Rotorwelle (Hohlwelle) 65 mündet in der Zwischenkammer 42. Die Zwischenkammer 42 weist eine lanzenartige Führung 68 auf, die dazu führt, dass der Speichervolumenstrom innerhalb des Hohlraumes 64 der Zwischenkammer 42 eine vorgegebene Zwangsführung erhält. Der Speichervolumenstrom wird innerhalb der Zwischenkammer 42 somit verwirbelt und entlang des Gehäuses der Zwischenkammer 42 geführt. Hierdurch ergibt sich eine verbesserte Wärmeabgabe durch erzwungene Konvektion an der relativ großen zur Verfügung stehenden Oberfläche der Innenwand der Zwischenkammer 42 über das Gehäuse 62 an die
Umgebung. Angedeutet ist dies durch einen Wärmeabführungspeil 70. This accumulator volume flow (return of the hydraulic fluid) is guided through a rotor shaft 65 of the rotor 34 within the motor 30 . This is designed as a hollow shaft for this purpose. An intermediate channel 66 between the rotor shaft (hollow shaft) 65 opens into the intermediate chamber 42. The intermediate chamber 42 has a lance-like guide 68, which causes the storage volume flow within the cavity 64 of the intermediate chamber 42 to be guided in a predetermined manner. The storage volume flow is thus swirled within the intermediate chamber 42 and guided along the housing of the intermediate chamber 42 . This results in improved heat dissipation through forced convection on the relatively large available surface of the inner wall of the intermediate chamber 42 via the housing 62 to the Vicinity. This is indicated by a heat dissipation indicator 70.
Das Verbindungsstück 52 zwischen dem Kanal 44 und dem Gehäuse 14 ist an dem Außenmantel der Zwischenkammer 42 geführt. The connecting piece 52 between the channel 44 and the housing 14 is guided on the outer casing of the intermediate chamber 42 .
Der Hydraulikeinheit 10 ist ein nicht näher gezeigtes Steuergerät zu geordnet, über das eine Ansteuerung des Motors 30 und somit die Förderleistung der Hydraulikpumpe 36 erfolgen kann. Der Wegsensor ist über Signalleitungen mit dem Steuergerät verbunden. Ferner kann der Hydraulikblock 38 elektrisch ansteuerbare Ventile umfassen, die ebenfalls mit dem Steuergerät regelungs- oder/oder steuertechnisch verbunden sind. The hydraulic unit 10 is assigned to a control unit, not shown in detail, via which the motor 30 and thus the delivery capacity of the hydraulic pump 36 can be controlled. The distance sensor is connected to the control unit via signal lines. Furthermore, the hydraulic block 38 can include electrically controllable valves, which are also connected to the control device for regulation and/or control purposes.
Alles in allem ist durch die erfindungsgemäße Ausgestaltung der Hydraulikeinheit 10 eine effektive und maximale Wärmeabfuhr möglich, so dass eine Kühlung des Motors 30 optimal erfolgen kann. All in all, the configuration of the hydraulic unit 10 according to the invention enables effective and maximum heat dissipation, so that the motor 30 can be optimally cooled.
Nach einem weiteren, nicht dargestellten Ausführungsbeispiel, kann der Hauptvolumenstrom auch unmittelbar durch den Innenraum des Motors 30 geführt sein. Beispielsweise axial durch einen Motor-Luft-Spalt und/oder durch Bohrungen, Ausnehmungen oder Nuten des Rotor- und/oder Statorblechpakets. According to a further exemplary embodiment, which is not shown, the main volume flow can also be routed directly through the interior of the motor 30 . For example, axially through an engine-air gap and/or through bores, recesses or grooves in the rotor and/or stator laminated core.
In Figur 2 ist ein Schaltzustand der Hydraulikeinheit 10 gezeigt, bei der der Kolben 16 des Aktuators 12 aus dem Gehäuse 14 ausgefahren wird. FIG. 2 shows a switching state of the hydraulic unit 10 in which the piston 16 of the actuator 12 is extended out of the housing 14.
Gleiche Teile wie in Figur 1 sind mit gleichen Bezugszeichen versehen und nicht nochmals erläutert. Parts that are the same as in FIG. 1 are provided with the same reference numbers and are not explained again.
Im Unterschied zu Figur 1 wird in Figur 2 die umgekehrte Strömungsrichtung des Hauptvolumenstromes und des Speichervolumenstromes durch die Hydraulikeinheit 10 deutlich. Auch bei diesem Schaltzustand wird die Hauptstromverbindung (hier als Rücklauf) zwischen Aktuator 12 und Hydraulikpumpe 36 durch das Motorgehäuse 28 geführt. In contrast to FIG. 1, the opposite flow direction of the main volume flow and the storage volume flow through the hydraulic unit 10 is clear in FIG. In this switching state, too, the main flow connection (here as a return flow) between the actuator 12 and the hydraulic pump 36 is routed through the motor housing 28 .
Nicht dargestellt ist, dass der Speichervolumenstrom über ein Rückschlagventil speicherstromrichtungsabhängig die Zwischenkammerzwischen Motor und Speicher nur in einer Richtung durchströmt, wie beispielsweise in Figur 1 gezeigt.
Nach einem nicht gezeigten Ausführungsbeispiel kann auch vorgesehen sein, dass der Motor mit dem Motorgehäuse als separates Bauteil ausgebildet ist, Dies bedeutet der Motor ist nicht unmittelbar mit der Hydraulikpumpe und/oder dem Zwischenspeicher und/oder dem Hydraulikblock und/oder der Leistungselektronik verbunden. Der Kanal der Hauptstromverbindung zur Kühlung des Motors wir auch bei diesen Ausführungsvarianten durch das Motorgehäuse geführt.
What is not shown is that the accumulator volume flow flows through the intermediate chamber between the motor and accumulator in only one direction via a check valve, depending on the accumulator flow direction, as shown for example in FIG. According to an exemplary embodiment that is not shown, it can also be provided that the motor is designed as a separate component with the motor housing. This means that the motor is not directly connected to the hydraulic pump and/or the buffer store and/or the hydraulic block and/or the power electronics. The duct of the main flow connection for cooling the motor is also routed through the motor housing in these design variants.
Bezugszeichen Reference sign
10 Hydraulikeinheit 10 hydraulic unit
12 hydraulischer Aktuator 12 hydraulic actuator
14 Gehäuse 14 housing
16 Kolben 16 pistons
18 Dichtung 18 seal
20 Dichtelement 20 sealing element
22 Kammer 22 chamber
24 Kammer 24 chamber
28 Motorgehäuse 28 motor housing
30 Motor 30 engine
32 Stator 32 stator
34 Rotor 34 rotors
36 Hydraulikpumpe 36 hydraulic pump
38 Hydraulikblock 38 hydraulic block
40 Hydraulikspeicher 40 hydraulic accumulators
42 Zwischenkammer 42 intermediate chamber
44 Kanal 44 channel
46 Außenmantel, Außenwandung46 outer jacket, outer wall
48 Eingangsseite 48 entry page
50 Ausgangsseite 50 home page
52 Verbindungsstück 52 connector
54 Einlass 54 entry
56 Verbindung 56 connection
58 Befestigungsabschnitt 58 attachment section
60 Wärmepfeil 60 Heat Arrow
62 Gehäuse
64 Hohlraum 62 housing 64 cavity
65 Rotorwelle 65 rotor shaft
66 Zwischenkanal 66 intermediate canal
68 lanzenartige Führung 70 Wärmeabführungspfeil
68 lance-like guide 70 heat dissipation arrow
Claims
1. Hydraulikeinheit (10) zur Bereitstellung einer unter Druck stehenden Hydraulikflüssigkeit, mit einem in einem Motorgehäuse (28) angeordneten Motor (30) und einer in einem Hydraulikgehäuse angeordneten Hydraulikpumpe (36), wobei Motorgehäuse (28) und Hydraulikgehäuse fluidtechnisch miteinander verbunden sind, dadurch gekennzeichnet, dass zumindest eine hochdruckbeaufschlagbare Hauptstromverbindung zwischen der Hydraulikpumpe (36) und einem Aktuator (12) durch mindestens einen Kanal (44) des Motors (30) geführt ist. 1. Hydraulic unit (10) for providing a pressurized hydraulic fluid, with a motor (30) arranged in a motor housing (28) and a hydraulic pump (36) arranged in a hydraulic housing, the motor housing (28) and hydraulic housing being fluidically connected to one another, characterized in that at least one main flow connection that can be subjected to high pressure is routed between the hydraulic pump (36) and an actuator (12) through at least one channel (44) of the motor (30).
2. Hydraulikeinheit (10) nach Anspruch 1, dadurch gekennzeichnet, dass der Kanal (44) durch das Motorgehäuse (28) geführt ist. 2. Hydraulic unit (10) according to claim 1, characterized in that the channel (44) is guided through the motor housing (28).
3. Hydraulikeinheit (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Hauptstromverbindung durch den Motor (30) ein Vorlauf ist. 3. Hydraulic unit (10) according to claim 1, characterized in that the main flow connection through the motor (30) is a flow.
4. Hydraulikeinheit (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Hauptstromverbindung durch den Motor (30) ein Rücklauf ist. 4. Hydraulic unit (10) according to claim 1, characterized in that the main flow connection through the motor (30) is return.
5. Hydraulikeinheit (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Hauptstromverbindung durch den Motor (30) in Abhängigkeit einer Drehrichtung der Hydraulikpumpe (36) der Vorlauf oder der Rücklauf ist. 5. Hydraulic unit (10) according to claim 1, characterized in that the main flow connection through the motor (30) depending on a direction of rotation of the hydraulic pump (36) is the flow or the return.
6. Hydraulikeinheit (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Hydraulikpumpe (36) eine im Vierquadrantenmodus betreibbare Pumpe ist, die eine Förderung und Rekuperation in beiden Drehrichtungen der Pumpe erlaubt.
6. Hydraulic unit (10) according to any one of the preceding claims, characterized in that the hydraulic pump (36) is a pump that can be operated in four-quadrant mode, which allows delivery and recuperation in both directions of rotation of the pump.
7. Hydraulikeinheit (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der wenigstens eine Kanal (44) des Motorgehäuses (28) eine direkt mit der Außenseite des Motorgehäuses (28) in Kontakt kommende Wandung (46) umfasst. 7. Hydraulic unit (10) according to any one of the preceding claims, characterized in that the at least one channel (44) of the motor housing (28) comprises a wall (46) coming into direct contact with the outside of the motor housing (28).
8. Hydraulikeinheit (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der mindestens eine Kanal (44) mäanderförmig und/oder spiralförmig durch das Motorgehäuse (28) geführt ist. 8. Hydraulic unit (10) according to one of the preceding claims, characterized in that the at least one channel (44) is guided in a meandering and/or spiral shape through the motor housing (28).
9. Hydraulikeinheit (10) nach Anspruch 1, dadurch gekennzeichnet, dass mindestens ein hochdruckbeaufschlagbarer Kanal für den Hauptvolumenstrom durch den Stator (32) des Motors (30) geführt ist. 9. Hydraulic unit (10) according to claim 1, characterized in that at least one channel for the main volume flow that can be subjected to high pressure is guided through the stator (32) of the motor (30).
10. Hydraulikeinheit (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Gehäuse für eine Leistungselektronik des Motors durch den Hauptvolumenstrom in einem separaten hochdruckbeaufschlagbaren Kanal ebenfalls durchströmt wird. 10. Hydraulic unit (10) according to any one of the preceding claims, characterized in that a housing for power electronics of the motor is also flowed through by the main volume flow in a separate high-pressure channel.
11. Hydraulikeinheit (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Speichervolumenstrom zwischen einem Speichergehäuse und der Hydraulikpumpe (36) durch einen vom Hauptvolumenstrom getrennten Kanal (66) durch den Motor (30) geführt ist. 11. Hydraulic unit (10) according to one of the preceding claims, characterized in that an accumulator volume flow between an accumulator housing and the hydraulic pump (36) is guided through the motor (30) through a channel (66) separate from the main volume flow.
12. Hydraulikeinheit (10) nach Anspruch 10, dadurch gekennzeichnet, dass der Kanal (66) für den Speichervolumenstrom durch eine Rotorwelle (65) des Motors (30) geführt ist. 12. Hydraulic unit (10) according to claim 10, characterized in that the channel (66) for the accumulator volume flow is guided through a rotor shaft (65) of the motor (30).
13. Hydraulikeinheit (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Hauptvolumenstrom durch den Rotorraum und/oder die Rotorwelle des Motors geführt
ist und der Speichervolumenstrom mäanderförmig und/oder spiralförmig durch das Motorgehäuse (28) geführt ist. 13. Hydraulic unit (10) according to any one of the preceding claims, characterized in that the main volume flow is guided through the rotor space and/or the rotor shaft of the motor and the storage volume flow is guided in a meandering and/or spiral shape through the motor housing (28).
14. Hydraulikeinheit (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Hydraulikspeicher (40) eine Zwischenkammer (42) umfasst, die eine große Oberfläche zur Umgebung aufweist. 14. Hydraulic unit (10) according to any one of the preceding claims, characterized in that the hydraulic accumulator (40) comprises an intermediate chamber (42) which has a large surface to the environment.
15. Hydraulikeinheit (10) nach Anspruch 10, dadurch gekennzeichnet, dass der Speichervolumenstrom über ein Rückschlagventil speicherstromrichtungsabhängig die Zwischenkammerzwischen Motor und Speicher nur in einer Richtung durchströmt.
15. Hydraulic unit (10) according to claim 10, characterized in that the accumulator volumetric flow flows through the intermediate chamber between motor and accumulator via a non-return valve, depending on the accumulator flow direction, in only one direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021119466.0A DE102021119466B4 (en) | 2021-07-27 | 2021-07-27 | Hydraulic unit |
PCT/EP2022/069922 WO2023006454A1 (en) | 2021-07-27 | 2022-07-15 | Hydraulic unit |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4377576A1 true EP4377576A1 (en) | 2024-06-05 |
Family
ID=82611091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22744205.0A Pending EP4377576A1 (en) | 2021-07-27 | 2022-07-15 | Hydraulic unit |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4377576A1 (en) |
CN (1) | CN117940676A (en) |
DE (1) | DE102021119466B4 (en) |
WO (1) | WO2023006454A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19628781A1 (en) * | 1996-07-17 | 1998-01-22 | Voith Turbo Kg | Pump unit with a drive cooling system using the liquid to be pumped |
DE19744599A1 (en) * | 1997-10-09 | 1999-04-15 | Volkswagen Ag | Hydraulic circuit with hydraulic medium esp. oil circulating in hydraulic line |
DE10026147C2 (en) * | 2000-05-26 | 2002-04-18 | Emg Eltma Hebezeuge Oschersleb | Electro-hydraulic actuator |
DE102008025054B4 (en) | 2008-05-26 | 2011-04-28 | Böhner-EH GmbH | hydraulic unit |
DE102015206236A1 (en) | 2014-12-19 | 2016-06-23 | Robert Bosch Gmbh | Hydraulic unit and method for operating a hydraulic unit |
CN111852982A (en) * | 2020-07-13 | 2020-10-30 | 南京理工大学 | Integrated radiating pump-controlled hydraulic cylinder |
-
2021
- 2021-07-27 DE DE102021119466.0A patent/DE102021119466B4/en active Active
-
2022
- 2022-07-15 EP EP22744205.0A patent/EP4377576A1/en active Pending
- 2022-07-15 CN CN202280062071.7A patent/CN117940676A/en active Pending
- 2022-07-15 WO PCT/EP2022/069922 patent/WO2023006454A1/en active Application Filing
Also Published As
Publication number | Publication date |
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DE102021119466B4 (en) | 2024-04-11 |
CN117940676A (en) | 2024-04-26 |
WO2023006454A1 (en) | 2023-02-02 |
DE102021119466A1 (en) | 2023-02-02 |
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