EP0683864A1 - Hydraulikaggregat. - Google Patents
Hydraulikaggregat.Info
- Publication number
- EP0683864A1 EP0683864A1 EP94906166A EP94906166A EP0683864A1 EP 0683864 A1 EP0683864 A1 EP 0683864A1 EP 94906166 A EP94906166 A EP 94906166A EP 94906166 A EP94906166 A EP 94906166A EP 0683864 A1 EP0683864 A1 EP 0683864A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil container
- unit according
- hydraulic unit
- wall
- hollow
- 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
Links
Classifications
-
- 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
- F15B21/008—Reduction of noise or vibration
-
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/02—Pumping installations or systems having reservoirs
- F04B23/025—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir
-
- 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
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
-
- 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
- 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
Definitions
- the invention relates to a hydraulic unit, the essential components of which, according to the preamble of claim 1, are an oil container and a pump unit.
- the oil container is hollow and has a receiving volume for oil between an outer outer wall and an inner outer wall.
- the pump unit comprises an electric motor and a pump which can be driven by the electric motor.
- Such a hydraulic unit in which the electric motor is also air-cooled, is known from DE-GM 82 07 794.
- a hollow cylindrical oil container and the pump unit are arranged upright.
- the oil container is considerably shorter than the pump unit and is at a distance from the feet of a frame which carries the oil container and the pump unit.
- a pipe which is connected to the pressure connection of the pump, is wound into three radially superposed pipe spirals.
- the interior inside the inner outer wall of the oil tank and the spiral pipes is sealed airtight near the floor, while it is covered at the top by a ventilation grille.
- a fan wheel is arranged on the side of the electric motor opposite the pump between the latter and the ventilation grille.
- the invention is based on the object of further developing a hydraulic unit with the features from the preamble of claim 1 in such a way that the noise level is low.
- adequate cooling of the hydraulic oil and the pump unit, in particular the electric motor of the pump unit is to be ensured by a further embodiment. It is also important to ensure that the hydraulic unit is easy to install.
- the goal of low noise emission is achieved for a hydraulic unit which has the features from the preamble of claim 1 by additionally having the features from the characterizing part of claim 1.
- the pump or the pump unit is encapsulated with the aid of the oil container and one or more sound damping elements, so that the hydraulic unit has only a low noise level.
- Mainly two principles are used to cool the hydraulic motor of a hydraulic unit that drives a hydraulic pump.
- One is the principle of air cooling.
- a fan wheel is assigned to the electric motor, which is usually driven by the electric motor itself and, with the aid of a guide plate, generates an air flow which sweeps over cooling fins on the outside of the motor housing.
- liquid cooling of the electric motor by means of the oil located in an oil reservoir of a hydraulic unit is known.
- the electric motor together with the pump is immersed in the oil in the oil container.
- the unit consisting of the electric motor and pump is then referred to as the sub-oil unit.
- the pump unit is immersed in the oil located in an oil container, compared to a hydraulic unit in which the pump unit is located outside the oil tank, the noise emissions have already been reduced.
- a further reduction in noise is achieved if the oil container, which is referred to below as the second oil container, together with the lower oil unit, is accommodated in a capsule which is essentially formed by the hollow, first oil container and at least one sound-absorbing element. wherein the outer wall of the second oil container and the inner outer wall of the first oil container are spaced apart.
- the two oil containers are connected to one another for oil exchange, so that heat transferred from the electric motor to the oil can be released to the outside via the first oil container.
- the pump will suck oil from the second oil container during operation, while a return line opens into the first oil container, so that a forced exchange of oil takes place between the two containers.
- the space between the outer wall of the second oil tank and the inner outer wall of the first oil tank is in air exchange with the surroundings.
- a cooling air flow can even be generated in the intermediate space.
- the two oil containers can be connected to one another in the manner of communicating tubes through the space between them. Then, however, openings as well as a piece of pipe or hose between the two openings are necessary in the outer wall of the second oil container and in the inner outer wall of the first oil container. In addition, the connection would have to be sealed well.
- no special measures have to be taken to bring oil into both containers. No sealing problems occur if the two oil containers are connected to one another via a riser pipe that dips into both oil volumes and runs above the oil level.
- riser pipe runs over the outer walls, there are no holes in the outer walls and the riser pipe is easy to attach. To fill, you can immerse the riser pipe in oil, then close both ends, bring the riser pipe into its correct position and then open the ends again. It also seems possible in an oil to produce an overpressure relative to the other oil container and thereby press oil into the riser pipe.
- a sound-absorbing element is used according to claim 7 that is permeable to a cooling air flow.
- the fan wheel sucks in cool air from the outside via a sound-absorbing element, blows it over the electric motor and pushes it out of the interior again through the same or a second sound-absorbing element.
- a soundproofing panel can consist of several spaced-apart foam panels with mutually offset openings. Since the sound can only propagate in a straight line, it is strongly dampened due to the offset openings. On the other hand, air can get into or out of the interior through the openings.
- the hollow oil container is so large that the inner space delimited by the inner outer wall accommodates the entire pump unit or the entire second oil container, and that there is a soundproofing plate on an open side of the inner space . Due to the size of the hollow oil container, the outer outer wall now has a large area over which heat exchange between the oil in the oil container and a cooling medium surrounding the oil container, e.g. B. air can take place. This heat exchange is sufficient to keep the oil within the operating temperature range in many cases.
- a cooling medium surrounding the oil container e.g. B. air
- the hollow oil container is designed like a hollow cylinder with two open end faces, with a sound-absorbing element on each end face of the interior. It is not imperative that the hollow oil container have the same cross-section over its entire length. It is also conceivable, for example, that the hollow oil container is slightly frustoconical. However, it appears particularly favorable if the hollow oil container is a hollow cylinder which has the same cross section over its entire length. The Sheets from which. the outer walls of the hollow oil container are produced, can then be shaped particularly easily. If the hollow oil container of the hydraulic unit is designed like a hollow cylinder, the pump unit is advantageously arranged in the interior such that its axis runs in the longitudinal direction of the hollow oil container.
- the hydraulic unit then takes up little floor space.
- a cooling air flow can then be generated in a simple manner through one end face of the interior space entering the interior space and exiting the interior space at the other end face. It is favorable for an unhindered air inlet on one end face or for an unhindered air outlet on the other end side of the hydraulic unit, as well as for a high stability, if the hollow oil container and the pump unit are arranged horizontally according to claim 11.
- the hollow oil container is designed like a trough with an open side, this open side being covered by a sound-absorbing element.
- the trough-like oil container can be arranged horizontally in such a way that the interior is open upward in one direction against the force of gravity. There is then the advantage that a connection point between the two outer walls can easily be placed at a level above the maximum oil level, so that the risk of leakage at the oil tank is very low.
- the pan-like oil container can then also be open at the top and only covered. It is also possible to arrange the trough-like oil container so that the interior is laterally open, so that the bottoms of the two outer walls are more or less vertical.
- the pump unit may then be more easily accessible than in another arrangement.
- the pump unit is preferably arranged horizontally with its axis parallel to the bottom of the trough in the oil container, the oil container preferably being elongated to match the shape of the pump unit.
- the horizontal arrangement of the pump unit makes it possible to easily lead through the interior Provide cooling air flow between two areas of the sound damping element through which the cooling air flow can pass.
- the stability is very high when the oil container is arranged horizontally.
- the outer outer wall of the trough-like hollow oil container is part of a machine stand, that is, in addition to the function as part of the oil container, also has a supporting function for a machine.
- the outer outer wall is part of a machine stand, it is provided with brackets to support the inner outer wall on the inside of its casing, from which the inner outer wall is supported.
- Another possibility of supporting the inner outer wall of a trough-like hollow oil container via the outer outer wall is to provide spacers between the bottoms of the two outer walls, on which the inner outer wall rests.
- both outer walls of the hollow oil container are led outwards, each with a flange-like section, and the two flange-like sections lie directly on top of one another or via a spacer element. If the hollow oil container is trough-like and arranged so that the trough is open at the top, the inner outer wall is supported in this way by the outer outer wall.
- the flange-like section can be used in the manufacture of the outer wall e.g. form in a deep-drawing process.
- a lifting force acts on the inner outer wall of the hollow oil container, against which the inner outer wall is to be held in position.
- This can be done, for example, by firmly connecting the two outer walls of the hollow oil container to one another, for example by means of screws or clips.
- a possible solution is also to hold the inner outer wall and, via this, also the outer outer wall firmly to a foundation.
- a particularly elegant solution according to claim 18 is that the weight of the pump unit or the second oil container against the inner outer wall against the buoyancy force holds down. Of course, both the weight of the pump unit and the weight of the oil container can also be effective.
- the pump unit and / or the second oil container can be carried by the hollow oil container, as stated in claim 19. However, it also seems favorable if according to the claim
- the hollow oil container and / or the pump unit and / or the second oil container are carried by a frame.
- both outer walls are led outwards with a flange-like section and lie directly or over one Spacers to each other, whereby they are positioned relative to one another in terms of their height.
- a seal between the two outer walls of the hollow oil container is preferably made according to claim 23 with the help of an elastomer seal between the two outer walls, and with the aid of clamps which hold the two outer walls with the intermediate layer of the ela Hold the stomer seal together.
- Claims 24 to 26 state how, in an advantageous embodiment of a hydraulic unit according to the invention, which in particular has a trough-like hollow oil container, on the one hand the pump unit can be cooled sufficiently and noise emissions are kept low. By shielding the pump unit from the hollow oil container, as is provided according to claim 27, the sound emission of the unit is further reduced.
- the hollow oil container and the pump unit are preferably carried independently of one another by a frame, preferably by the same frame. This means that it is not the hollow oil container that is attached to the pump unit or the pump unit on the hollow oil container, but that both the hollow oil container and the pump unit are carried individually by the frame. This prevents direct transmission of structure-borne noise from the pump unit to the hollow oil container. The transmission of such structure-borne noise is particularly effectively avoided if, according to claim 29, the pump unit and, according to claim 30, the hollow oil container are carried at each support point via at least one damping bearing with an elastic body. This is particularly advantageous in connection with the embodiment according to claim 28, since there are then at least two damping bearings between the pump unit and the hollow oil container.
- a special design of a support point of the pump unit or the hollow oil container is specified. Such a support point ensures that structure-borne noise is transmitted neither directly nor via tensioning means.
- Common damping bearings usually consist of two dimensionally stable plates and an elastic body located between the two plates, which is usually a rubber body.
- the dimensionally stable plates also serve to obtain a large contact surface for the elastic body regardless of the size of the supports for the dimensionally stable plates. If, in a hydraulic unit according to the invention, the pump unit or the hollow oil container is supported on an elongated support, the contact surface of the elastic body on the support is large enough even without a dimensionally stable plate between the elastic body and the support if, according to claim 32 Damping bearings extends along the beam.
- the support surfaces on the pump unit or on the hollow oil container can also be made so large that the elastic body can rest directly on them.
- a damping bearing extends transversely to an elongated carrier, then according to claim 33, a dimensionally stable plate of the damping bearing extending transversely to the elastic body of the damping bearing and the carrier is advantageously arranged.
- a damping bearing which is arranged transversely to the carriers, expediently extends over both carriers according to claim 36. This provides it with a stable support. So that the support surface is large, there is a dimensionally stable plate between the elastic body of the damping bearing and the longitudinal members. At the same time, this can also be used to firmly connect the two beams to one another instead of a separate cross beam, in particular arranged outside the interior, or together with such a cross beam.
- a particularly simple support of a hollow cylindrical oil container on the frame is obtained according to claim 40 with the aid of two damping bearings, which are preferably located between the inner outer wall of the hollow oil container and at least one longitudinal member running through the interior.
- two damping bearings which are preferably located between the inner outer wall of the hollow oil container and at least one longitudinal member running through the interior.
- an arrangement of the damping bearings between the longitudinal member and the outer outer wall of the hollow oil container is also possible if the outer wall projects axially beyond the inner wall.
- Such a damping bearing in particular its elastic body, preferably largely fills the free cross section between the at least one side member and the hollow oil container. This results in a relative movement between the damping bearing and the oil tank in a direction perpendicular to the longitudinal direction of the oil tank is not possible.
- a soundproofing plate therefore only covers the area of an end face of the hollow oil container that remains next to the damping bearing. This also has advantages in terms of assembly, since the soundproofing plate now ends at the level of the side members and can be assembled or disassembled on the frame without manipulation.
- a piece of hose is inserted into such a line so that no sound is transmitted via the lines between the pump and the hollow oil container.
- the sound reduction also contributes if, according to claim 44, a pulsation damper inserted into the pressure line of the pump is arranged within the interior space surrounded by the inner outer wall of the hollow oil container.
- the pulsation damper itself already brings about a reduction in noise emissions.
- the hollow oil container is preferably essentially rectangular in cross section on the outside in order to make the best possible use of the available installation space.
- the hydraulic unit is advantageously designed such that a cooling liquid can flow around an outer wall of the hollow oil container.
- a third container wall can be provided at a distance from the outer wall of the hollow oil container.
- a hollow oil container can be produced from plastic by blow molding.
- FIG. 1 with the oil container cut open, a side view of a first exemplary embodiment which has a hollow cylindrical oil container,
- FIG. 2 shows a top view of the first exemplary embodiment with the oil container cut open
- Figure 3 is a ⁇ view in the direction of arrow A of Figure 1, however, the front-side sound absorbing plate is omitted.
- FIG. 4 shows a longitudinal section through a second exemplary embodiment which has a trough-like oil container, the pump unit not being cut.
- FIG. 5 shows a section along the line V-V from FIG. 4, only one half of the unit being shown
- FIG. 6 shows a section along the line VI-VI from FIG. 4,
- FIG. 7 shows a third exemplary embodiment which has a trough-like hollow oil container, the outer outer wall of which is part of a machine frame of a plastic injection molding machine,
- FIG. 8 shows a section along the line VIII-VIII from FIG. 9 through a hollow cylindrical oil container of a fourth exemplary embodiment, which is made of plastic and is made by blow molding,
- FIG. 9 shows a section along the line IX-IX from FIG. 8,
- FIG. 10 shows a fifth exemplary embodiment which has a trough-like hollow oil container which surrounds a second oil container with a sub-oil unit at a distance, and in which the two oil containers are connected to one another in the manner of communicating tubes,
- FIG. 11 shows a section from a sixth exemplary embodiment, which largely corresponds to that from FIG. 10, but in which the two oil containers are connected to one another via a riser pipe, and
- Figure 12 shows a seventh embodiment in which only the pump is encapsulated.
- the essential components of the hydraulic units shown are a hollow oil container 10 and a pump unit 11, which are carried by a separate frame 12 in the embodiments according to FIGS. 1 to 6 and 8 and 9.
- the oil container 10 of the embodiment according to Figures 1 to 3 is hollow cylindrical, so has the same cross-section over its entire length, and has an outer outer wall 13 and an inner outer wall 14, between each of which an annular, the cross-section between the inner outer wall and the outer outer wall filling floor 15 is inserted.
- the container In the outer cross section, the container is essentially rectangular.
- At the top of the outer outer wall 13 there is a socket 16 for filling in oil and for venting the container.
- the inner outer wall 14 has the same small radius as the outer outer wall at all four corners. The two lower corners of the inner outer wall 14 are less curved.
- the pump unit 11 is of a commercially available type and is air-cooled.
- It includes a hydraulic pump 20, an electric motor 21, by which the hydraulic pump 20 is driven, and a fan wheel 22, which is fastened at one end of the electric motor 21 within a guide plate 23 on the shaft of the electric motor, that is to say is also driven by the electric motor.
- the fan wheel sucks air through the front slots of the guide plate 23 and presses it through a circumferential slot between the guide plate 23 and the housing of the electric motor, so that the air flows along the outside of the electric motor.
- the frame 12 of the embodiment according to FIGS. 1 to 3 has two longitudinal beams 30 which are designed as angled profiles and which run through this inner space at approximately two thirds of the height of the inner space 31 surrounded by the inner outer wall 14 of the oil container.
- One leg 32 of a longitudinal beam 30 is arranged lying parallel to the upper sides of the outer outer wall 13 or the inner outer wall 14 and the other leg 33 is arranged perpendicular to the said upper sides. So that the side members can run as close as possible to the pump unit, the respective upright leg is located on the outer longitudinal edge of the respective side leg 32, which is further away from a central plane 34 between the two side members.
- the side members 30 protrude beyond the oil container 10 the end faces and are rigidly connected to each other by a cross member 36 in front of each end face.
- Each cross member 36 in turn projects beyond the side members 30 and rests there on a frame support 35.
- the frame supports 35 are thus largely outside the area inscribed by the inner outer wall 14 of the oil container 10, that is to say outside the cross-sectional area of the interior 31.
- the pump unit 11 is suspended from the oil container 10 in the interior 31 on the side members 30 of the frame 12.
- four brackets 40 are attached to the electric motor 21.
- an elastic body 41 is inserted, which extends along the longitudinal member. It can be viewed as a damping bearing.
- a second damping bearing 42 which, in addition to an elastic body 41 which is supported directly on the leg 32, has a dimensionally stable plate 43 above the elastic body.
- a threaded bolt is inserted through each bracket 40, the damping bearing 41, the leg 32 of a longitudinal member and the damping bearing 42, onto which a screw nut is screwed below the bracket 40 and above the dimensionally stable plate 43.
- the clamping means 44 consisting of the threaded bolt and the two screw nuts, a holding bracket, the two damping bearings 41 and 42 and the longitudinal member are held together.
- the pump unit is thus suspended from the frame 12 in a sound-insulated manner. It is also ensured that the bracket 40 and the clamping means 44 do not touch the side members 30.
- the hydraulic pump 20 is connected to the oil tank 10 via a suction line 45 and a further line 46. So about this
- the oil container 10 lies freely on the longitudinal members 30 via two damping bearings 55.
- Each damping bearing 55 is located on an end face of the oil container and consists of a stable plate 56 extending across the two longitudinal beams 30 and an elastic body 57 which largely fills the cross section between the plate 56 and the inner outer wall 14 of the oil container 10 and on three sides of the inner outer wall 14 abuts.
- the oil container can thus lower in one direction. do not move right to its longitudinal direction relative to the damping bearing 55.
- the stable plate can be firmly connected, for example by screwing, to the longitudinal beams 30 in order to prevent it from slipping on the longitudinal beams. There are therefore two sound-absorbing transitions between the pump unit 11 and the oil container, so that very good vibration and structure-borne sound insulation is ensured.
- a soundproofing plate 60 which consists of a plurality of spaced-apart foam layers with openings distributed over the entire surface of a layer.
- the breakthroughs of two adjacent layers of foam are offset from one another, so that on the one hand air can get into or out of the interior 31 and on the other hand noises generated by the pump unit only reach the outside in a dampened manner since sound only propagates in a straight line can. A so-called sound labyrinth is created through the different layers.
- each sound absorbing plate 60 is recessed in accordance with the contour of each longitudinal beam, so that the legs 32 and 33 of a longitudinal beam can pass through them. Outside the longitudinal beams 30, each soundproofing plate 60 extends to the stable plate 56 of the damping bearing assigned to the respective end face
- the pump unit 11 and the pulsation damper 49 are thus located within the encapsulated interior 31. A high level of noise damping is thus ensured.
- a further line connected to the pulsation damper 49 but not shown in any more detail, there is still a breakthrough in one of the damping bearings 55 or one of the sound damping plates 60. It has been shown that simply inserting a pulsation damper into the pressure line directly at the pressure outlet of the pump, in addition to damping the pressure pulsations in the hydraulic medium, also brings about a substantial reduction in noise.
- the additional arrangement of the pulsation damper in an encapsulated cavity further reduces the externally perceptible noise level.
- the unit can also be arranged upright.
- the hydraulic unit according to FIGS. 4 to 6 has a trough-like oil container 10, the two outer walls 13 and 14 of which are deep-drawn and each have a bottom 65, four side parts 66 and a flange 67 guided outwards at the upper edge. Between the outer walls 13 and 14 there is the same distance everywhere in the area of the floors and the side parts. The distances in particular between the floors 65 on the one hand and the
- side parts 66 can also be different. Two opposite side parts of each outer wall are longer than the other two side parts, so that the oil container 10 has an elongated shape overall.
- the flange 67 of the inner outer wall 14 is wider than the flange 67 of the outer outer wall 13. Both flanges 67 end exactly one above the other on the outside. Between the flanges 67 an elastomer seal 68 is inserted which, like the bottoms 15 of the embodiment according to FIGS. 1 to 3, closes off the space between the two outer walls 13 and 14 which holds the hydraulic oil, but which is above the one in the figures 4 and 6 is the maximum oil level indicated by arrows, so that the risk of leakage in the oil tank of the unit according to FIGS.
- the outer wall 13 is surrounded at a short distance by a further container wall 69, the upper edge of which is also led outwards as a flange-like section 67.
- Water can flow between the outer wall 13 and the container wall 69, through which the hydraulic oil located between the two outer walls 13 and 14 can be cooled.
- Appropriate barriers between the two walls 13 and 69 can ensure that the water flows in the manner of a cooling coil from an entrance to an exit.
- An elastomer seal 70 is located between the flanges 67 of the outer wall 13 and the container wall 69.
- the pump unit 11 of the embodiment according to FIGS. 4 to 6 is likewise located entirely in the inner space 31 delimited by the inner outer wall 14 and in turn has an electric motor 21, by which a hydraulic pump 20 and a fan wheel located inside a guide plate 23 can be driven is.
- the pump unit 11 is arranged with its axis in the longitudinal direction of the oil container 10 in its interior 31 and suspended from a frame 12. Similar to the embodiment according to FIGS. 1 to 3, this frame includes four frame supports 35, two of which are located on a longitudinal side of the oil container 10 outside of the latter. With its flanges 67, the oil container 10 rests on the frame supports 35 via damping bearings 71. A damping bearing 71 is also inserted between a foundation and each frame support 35.
- each frame support 35 On each frame support 35, the three flanges 67 with the elastomer seals 68 and 70 located therebetween as well as with the damping bearing 71 located below the flange 67 of the container wall 69 and with another damping bearing placed on the flange 67 of the inner outer wall 14 71 held together by a clamp 72.
- Two supports 30 extend above the oil container 10 across the interior 31 and are each fastened to two frame supports 35 which are opposite one another. Within the interior 31, the two supports 30 are connected to one another by two further supports 73, which run in the longitudinal direction of the container 10 and which are suspended from the supports 30 via damping bearings 71.
- the brackets 73 are close to the inner one Outer wall 14 of the oil container 10 so that it does not unnecessarily complicate access to the hydraulic pump 20, over which the one carrier 30 extends.
- two further carriers 74 which run parallel to the carriers 30 but are at a smaller distance from the carriers 30 from one another, are fastened directly to the carriers 73, to which carrier eyes 75, which are formed in one piece with the housing of the electric motor 21, the pump unit 11 is suspended. It is also conceivable to reduce the distance between the carriers 73 or to let the fastening eyes 75 run obliquely outwards, so that the pump unit 11 can be fastened directly to the carriers 73 and the carriers 74 can be dispensed with.
- a two-part soundproofing plate 80 is placed, which is separated in the area of the interface between the electric motor 21 and hydraulic pump 20, so that only one part of the soundproofing plate 80 is lifted off for access to the hydraulic pump 20 must become.
- the soundproofing plate has corresponding recesses for the supports 30, the damping bearings 71 between the supports 30 and the supports 73 and for the clamps 72.
- the soundproofing plate 80 is provided with an opening 81 or 82, which opens into the interior 31 directly inside the side parts 66 of the inner outer wall 14.
- the openings 81 and 82 to the pump unit 11 are each shielded by a sound damping plate 83, which is arranged perpendicular to the longitudinal axis of the pump unit 11 and projects from the sound damping plate 80 into the interior 31, but at a distance from the bottom 65 of the inner outer wall 14 of the container 10 Has.
- the soundproofing plates 83 can be air-permeable over their entire extent.
- a partition 84 which is arranged transversely to the axis of the pump unit 11 and which extends between the guide plate 23 on the one hand and the inner outer wall 14 of the oil container 10 and the soundproofing plate 80 on the other hand is not air-permeable.
- the partition 84 ensures that the fan wheel only sucks in air from the passage 81 and not inside Half of the interior 31 creates a closed air flow leading over the fan wheel.
- the two openings of the passage 82 are offset from one another by the width of this passage into the interior 31 and into the open.
- the passage 81 can also be designed in this way. This further reduces the noise emission of the hydraulic unit.
- the sound absorbing plates 60 of the embodiment according to FIGS. 1 to 3 are permeable to air.
- the pump unit 11 is shielded from the oil container 10 by sound damping plates 90, which are arranged between the pump unit and the long side parts of the inner outer wall 14 and extend between the wall 84 and the one wall 83.
- sound damping plates 90 are arranged between the pump unit and the long side parts of the inner outer wall 14 and extend between the wall 84 and the one wall 83.
- plates that are commercially available under the name "compact absorber” can be used for this.
- the hydraulic unit for the plastic injection molding machine partially shown in FIG. 7 has in principle the same structure as the hydraulic unit from FIGS. 4 to 6.
- a trough-like, hollow oil container 10 has a trough-like outer wall 13 and a trough-like inner wall 14, which has an interior 31 includes, in which the pump unit 11 is completely accommodated.
- This consists of an air-cooled electric motor 21 with a fan wheel located within a guide plate 23 and a hydraulic pump 22 which can be driven by the electric motor.
- An essential difference between the embodiment according to FIG. 7 and the embodiment according to FIGS. * To 6 is that the outer outer wall 13 of the embodiment according to FIG. 7 is now part of the machine stand of the plastic injection molding machine.
- the side parts 66 of the outer outer wall 13 therefore have a supporting function for the machine.
- brackets 85 are fastened to the inside of the side parts 66, on which the inner outer wall 14 of the oil container 10 rests with a flange 67 via a spacer 68, which can also act as a seal.
- the pump unit 11 is fastened to two supports 73 via fastening eyes 75 which are suspended from two longitudinal supports 30 via damping elements 71. These rest on the flange 67 of the inner outer wall 14 via damping bearings 86. The weight of the pump unit 11 thus bears on the inner outer wall 14 of the
- the elastomer seal 68 and the damping bearings 86 can easily be designed so that the inner outer wall 14 and the pump unit 11 cannot slip relative to one another and to the outer outer wall 13.
- a sound absorbing plate 80 covers the interior 31. This has the passages 81 which lie in the air flow cooling the electric motor.
- the passages 81 to the pump unit 11 are covered by sound damping plates 83 arranged perpendicular to the sound damping plate 30.
- the pump unit 11 is carried by the inner outer wall 13 of the oil container 10, that is to say by the oil container 10. There is no additional frame in this version.
- the hollow cylindrical oil container 10 according to FIGS. 8 and 9 is made in one piece from a plastic by blow molding, and a maintenance opening 87 is provided on it, which can be passed through from outside the outer walls 13 and 14 lead into the interior 31 and are located at such a place that through them one can easily get to a pump located in the interior 31.
- the maintenance opening is normally closed by a sound absorbing insert and is only opened for maintenance.
- On the oil container 10 are a piece 16, which is used for filling oil and a piece 88 is formed, which surrounds a cleaning opening and which, viewed in the longitudinal direction of the oil container 10, is located in the center of the oil container.
- the two hydraulic units according to FIGS. 10 and 11 in turn, like the embodiments according to FIGS. 4 to 6 and according to FIG. 7, have a trough-like hollow oil container 10 with an outer trough-like outer wall 13 and an inner trough-like outer wall 14.
- the bottom 65 of the outer wall 13 stands on a foundation 90 via block-like elastic bearings 89.
- further elastic bearings 89 which are located exactly above the bearings between the outer wall 13 and the foundation 90, the floor 65 of the outer wall 14 becomes at a distance from the floor 65 of the outer wall 13 held and the outer wall 14 supported on the outer wall 13.
- the pump unit 11 of the two versions according to FIGS. 10 and 11 is a so-called sub-oil unit which has no fan wheel and which is immersed in oil within a second oil container 91.
- the pump unit 11 is suspended obliquely on two supports 73 via elastic bearings 71 in such a way that the electric motor 21 is practically completely under oil, but the pump 20 looks out of the oil in some areas. In this area of the pump, e.g. electronic components are located, which advantageously remain free of oil.
- the second oil tank 91 is located within the inner space 31 delimited by the inner outer wall 14 of the first oil tank, is of a conventional design and has a single tub-like outer wall 92, the bottom 65 of which is spaced from the bottom 65 by means of elastic bearings 89 the inner outer wall 14 of the first oil container 10 is held. Also between the side parts of the Outer walls 14 and 92 are spaced apart. The supports 73 rest on the outer wall 92 of the second oil container, so that in addition to the weight of the oil container 91 and the weight of the pump unit 11, the inner outer wall 14 of the oil container 10 holds down over the uppermost blocks. A fixed connection between the two outer walls 13 and 14 of the oil container 10 or a direct connection of the inner outer wall 14 to the foundation 90 is not necessary.
- the two oil containers 10 and 91 communicate with one another via a tube 93, which leads through the intermediate space 94 between the outer walls 14 and 92 and each starts from an opening in the bottom 65 of these two outer walls.
- a tube an elastic hose can also be used.
- the pump sucks 20 oil to which is located in the second oil reservoir 91, while the return line opens out into the first oil reservoir 10, so "that forcibly held food holding an oil exchange between the ⁇ lbe ⁇ .
- hot oil gives his Heat is dissipated primarily via the outer outer wall 13 of the oil container 10, but also via the inner outer wall 14 of this oil container 14.
- the outer wall 92 of the second oil container also contributes to heat dissipation.
- Both oil containers 10 and 91 are covered by a sound absorbing plate 80.
- This has air slots 95 in the area of the space 94 so that the air located in the space 94 can be exchanged and heat can be transported to the outside.
- a cooling air flow or a cooling water flow can also be forcibly generated through the intermediate space 94.
- bearings can also be used which have an angular recess in which the trough-like outer walls 13, 14 and 92 sit with a corner.
- the bearings 89 which are located between the outer walls, can extend into the inner corners of the outer walls 13 and 14. In this way, they position the outer walls to each other.
- the gap 94 can be filled with sand.
- the pump 20 of the pump unit 11 is encapsulated by the hollow oil container 10 and by a sound-absorbing plate 80.
- the hollow oil container 10 is in turn trough-shaped with an inner outer wall 13 and an outer outer wall 14. Both outer walls are drawn outwards in flanges 67 at the upper edge of the oil container 10 and lie there on one another via an elastomer seal 68.
- the sound damping plate 80 has an opening 97.
- the weight of the pump unit rests on one or more supports 30 and on damping bearings 86 on the flange 67 of the inner outer wall 14 and thus when there is oil is located in the oil tank 10 to reduce the buoyancy on the inner outer wall 14, on the flange 67 of the outer outer wall 13.
- the carriers 30 are located in recesses on the inside of the soundproofing plate 80.
- the pump unit 11 can be supported in a particularly simple manner by means of supports 30 on the oil container 10.
- the fact that the interface between the pump 20 and the electric motor 21 is just at the level of the upper edge of the oil container 10 enables support with a straight support 30.
- the pump which is cooled by the hydraulic oil, is an essential source of noise Hydraulic unit noise encapsulated.
- the electric motor is located outside the capsule, so that no further measures have to be taken beyond the usual measures for cooling the electric motor. Due to the vertical arrangement of the pump unit, a hydraulic unit can be realized that takes up only a small footprint.
- Pump 20 and electric motor 21 are connected to one another in the usual way by means of an elastic pump support, whereby the transmission of structure-borne noise and vibrations is largely avoided.
- the pump vibrations are isolated and damped by a temperature and liquid-resistant rubber ring that transmits all forces in a positive manner. If a torsionally flexible coupling is used between the motor shaft and the pump shaft, there is no longer a metallic connection between the pump and the motor.
- An elastic bellhousing of conventional design is e.g. in the book "Fundamentals and Components of Fluid Power Hydraulics Volume I", 1991, published by the applicant, page 295 ff.
- a pulsation damper known per se, or an intermediate tank acting as a volume resonator, is inserted with particular advantage into the suction line of the pump and into the interior of the capsule or into the volume holding the oil. Because the airborne sound radiation from the pump is greatly reduced in an assembly according to the invention, the sound radiation through the oil container is of greater importance. This sound radiation is reduced by the pulsation damper or intermediate tank.
Abstract
Description
Claims
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4302843 | 1993-02-02 | ||
DE4302843 | 1993-02-02 | ||
DE4326139 | 1993-08-04 | ||
DE4326139 | 1993-08-04 | ||
DE4337131 | 1993-10-30 | ||
DE4337131A DE4337131A1 (de) | 1993-02-02 | 1993-10-30 | Hydraulikaggregat |
PCT/EP1994/000247 WO1994018459A1 (de) | 1993-02-02 | 1994-01-28 | Hydraulikaggregat |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0683864A1 true EP0683864A1 (de) | 1995-11-29 |
EP0683864B1 EP0683864B1 (de) | 1997-05-28 |
Family
ID=27204713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94906166A Expired - Lifetime EP0683864B1 (de) | 1993-02-02 | 1994-01-28 | Hydraulikaggregat |
Country Status (11)
Country | Link |
---|---|
US (1) | US5725361A (de) |
EP (1) | EP0683864B1 (de) |
JP (1) | JPH08506405A (de) |
KR (1) | KR100300478B1 (de) |
CN (1) | CN1056218C (de) |
AU (1) | AU5999794A (de) |
BR (1) | BR9405876A (de) |
CZ (1) | CZ285123B6 (de) |
DE (2) | DE4337131A1 (de) |
ES (1) | ES2102828T3 (de) |
WO (1) | WO1994018459A1 (de) |
Cited By (1)
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CN108006021A (zh) * | 2017-11-29 | 2018-05-08 | 浙江海洋大学 | 船舶的液压装置 |
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DE19500333C2 (de) * | 1995-01-07 | 1998-09-10 | Franz Henninghaus | Hydraulische Betätigungseinrichtung für Ladebordwände bei Fahrzeugen oder stationären Hubeinrichtungen |
DE19512901A1 (de) * | 1995-04-06 | 1996-10-10 | Rexroth Mannesmann Gmbh | Gestellanordnung für die Abstützung des Ölbehälters eines Hydraulikaggregats |
DE19711591A1 (de) | 1997-03-20 | 1998-09-24 | Fluidtech Gmbh | Fluidkühlvorrichtung |
US5894830A (en) * | 1997-12-15 | 1999-04-20 | Caterpillar Inc. | Engine having a high pressure hydraulic system and low pressure lubricating system |
DE29809935U1 (de) * | 1998-06-03 | 1998-10-08 | Heilmeier & Weinlein | Hydraulisches Motor-Pumpenaggregat |
DE10010776B4 (de) * | 2000-03-04 | 2008-04-24 | Bosch Rexroth Aktiengesellschaft | Hydraulikaggregat |
WO2003093675A1 (en) * | 2002-04-27 | 2003-11-13 | Lg Electronics Inc. | Compressor having noise reducing apparatus |
DE10224921A1 (de) * | 2002-06-04 | 2003-12-18 | Bosch Rexroth Ag | Grundplatte für ein Hydraulikaggregat |
DE10249337A1 (de) * | 2002-10-22 | 2004-05-06 | Bosch Rexroth Ag | Geräuscharmes Hydraulikaggregat |
DE10341425A1 (de) | 2003-09-09 | 2005-03-31 | Bosch Rexroth Ag | Hydraulikaggregat mit einem Vorratsbehälter für Hydraulik-Flüssigkeit und mit einer Motor-Pumpe-Einheit |
DE202005005623U1 (de) * | 2005-04-08 | 2006-08-10 | Hawe Hydraulik Gmbh & Co. Kg | Kompaktpumpen-Baugruppe und Hydroaggregat |
US20090263258A1 (en) * | 2007-02-27 | 2009-10-22 | Sauer-Danfoss Inc. | Vibration dampening media in hydraulic power units |
DE102008017253A1 (de) | 2008-04-04 | 2009-10-08 | Robert Bosch Gmbh | Vorrichtung zur Dämpfung von Pulsationen in einer Leitung für ein hydraulisches Druckmittel und Hydropumpe |
DE102010015496B4 (de) * | 2010-04-16 | 2018-07-12 | Gedore Torque Solutions Gmbh | Gehäuse für ein Hydraulikaggregat |
US8899378B2 (en) | 2011-09-13 | 2014-12-02 | Black & Decker Inc. | Compressor intake muffler and filter |
AU2012216658B2 (en) | 2011-09-13 | 2016-09-15 | Black & Decker Inc | Method of reducing air compressor noise |
CN103062160A (zh) * | 2013-01-24 | 2013-04-24 | 兰州理工大学 | 一种整体式电机叶片泵液压动力单元 |
US20150375966A1 (en) * | 2014-06-30 | 2015-12-31 | Thyssenkrupp Elevator Corporation | Noise Abatement for Elevator Submersible Power Units |
CN105697450A (zh) * | 2014-11-27 | 2016-06-22 | 无锡市海骏液压机电设备有限公司 | 液压泵站的缓冲支撑装置 |
CN105697939A (zh) * | 2014-11-27 | 2016-06-22 | 无锡市海骏液压机电设备有限公司 | 下置式液压泵支撑架 |
CN104481935B (zh) * | 2014-12-24 | 2016-11-09 | 淄博大力矿山机械有限公司 | 液压装岩机带冷却装置的液压油箱 |
JP2016203330A (ja) * | 2015-04-27 | 2016-12-08 | 日立Geニュークリア・エナジー株式会社 | 自律型筋肉ロボット |
US11111913B2 (en) | 2015-10-07 | 2021-09-07 | Black & Decker Inc. | Oil lubricated compressor |
CN105257609A (zh) * | 2015-11-23 | 2016-01-20 | 中核(天津)机械有限公司 | 机床液压站 |
CN106015167A (zh) * | 2016-07-13 | 2016-10-12 | 哈威油液压技术(上海)有限公司 | 齿轮泵液压泵站 |
DE102016009951A1 (de) * | 2016-08-12 | 2018-02-15 | Volker Kay Müller | Hydraulisches Antriebsaggregat |
CN109372830A (zh) * | 2018-12-12 | 2019-02-22 | 重庆凯瑞汽车试验设备开发有限公司 | 伺服油源装置 |
CN113800420A (zh) * | 2021-09-02 | 2021-12-17 | 武汉船用机械有限责任公司 | 一种扭转弹簧及辅助卷升的绞绳卷筒 |
DE102021133753A1 (de) * | 2021-12-17 | 2023-06-22 | Arburg Gmbh + Co Kg | Maschinengestell |
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- 1993-10-30 DE DE4337131A patent/DE4337131A1/de not_active Withdrawn
-
1994
- 1994-01-28 JP JP6517599A patent/JPH08506405A/ja active Pending
- 1994-01-28 BR BR9405876A patent/BR9405876A/pt not_active IP Right Cessation
- 1994-01-28 ES ES94906166T patent/ES2102828T3/es not_active Expired - Lifetime
- 1994-01-28 DE DE59402917T patent/DE59402917D1/de not_active Expired - Lifetime
- 1994-01-28 CZ CZ951683A patent/CZ285123B6/cs not_active IP Right Cessation
- 1994-01-28 WO PCT/EP1994/000247 patent/WO1994018459A1/de active IP Right Grant
- 1994-01-28 US US08/495,437 patent/US5725361A/en not_active Expired - Lifetime
- 1994-01-28 AU AU59997/94A patent/AU5999794A/en not_active Abandoned
- 1994-01-28 KR KR1019950703196A patent/KR100300478B1/ko not_active IP Right Cessation
- 1994-01-28 EP EP94906166A patent/EP0683864B1/de not_active Expired - Lifetime
- 1994-01-28 CN CN94191072A patent/CN1056218C/zh not_active Expired - Fee Related
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108006021A (zh) * | 2017-11-29 | 2018-05-08 | 浙江海洋大学 | 船舶的液压装置 |
CN108006021B (zh) * | 2017-11-29 | 2019-06-21 | 浙江海洋大学 | 船舶的液压装置 |
Also Published As
Publication number | Publication date |
---|---|
WO1994018459A1 (de) | 1994-08-18 |
DE59402917D1 (de) | 1997-07-03 |
DE4337131A1 (de) | 1994-09-08 |
AU5999794A (en) | 1994-08-29 |
CN1117309A (zh) | 1996-02-21 |
JPH08506405A (ja) | 1996-07-09 |
CZ285123B6 (cs) | 1999-05-12 |
KR960700416A (ko) | 1996-01-20 |
KR100300478B1 (ko) | 2001-10-22 |
ES2102828T3 (es) | 1997-08-01 |
CN1056218C (zh) | 2000-09-06 |
CZ168395A3 (cs) | 1999-02-17 |
US5725361A (en) | 1998-03-10 |
EP0683864B1 (de) | 1997-05-28 |
BR9405876A (pt) | 1995-12-12 |
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