US20140119961A1 - Motor-pump assembly - Google Patents
Motor-pump assembly Download PDFInfo
- Publication number
- US20140119961A1 US20140119961A1 US13/990,104 US201113990104A US2014119961A1 US 20140119961 A1 US20140119961 A1 US 20140119961A1 US 201113990104 A US201113990104 A US 201113990104A US 2014119961 A1 US2014119961 A1 US 2014119961A1
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- United States
- Prior art keywords
- connecting rod
- motor
- pump
- pump assembly
- roller bearing
- 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.)
- Abandoned
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- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 229920001971 elastomer Polymers 0.000 claims description 17
- 239000000806 elastomer Substances 0.000 claims description 17
- 238000001746 injection moulding Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
-
- 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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/025—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel
-
- 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
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/043—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms two or more plate-like pumping flexible members in parallel
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/001—Noise damping
- F04B53/003—Noise damping by damping supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2400/00—Special features of vehicle units
- B60Y2400/81—Braking systems
Definitions
- the invention concerns a motor-pump assembly, in particular for providing pressure for a brake actuation device of a motor vehicle brake system with a pneumatic brake booster, in particular a vacuum brake booster, comprising a pump and an electric motor driving the pump, wherein the pump is provided as a double diaphragm pump with two opposing working diaphragms which are each clamped between a pump housing and a working chamber cover and thus delimit a working chamber and which are movable by means of a crank drive having an eccentric and connecting rods, and wherein the connecting rods each have a connecting rod shank and a connecting rod eye of plastic and are mounted movably on the eccentrics by means of roller bearings.
- vacuum pumps are used which draw in residual air from the vacuum chamber and expel it to the atmosphere.
- vane pumps or variable geometry vane pumps In principle these have a great deal of friction and must be lubricated to achieve an acceptable service life.
- Vacuum pumps with vanes driven by the internal combustion engine of the motor vehicle are therefore connected to the oil circuit of the combustion engine.
- a significant proportion of the power emitted by the combustion engine must be used to drive such a pump. This also applies even when the vacuum is already fully formed in the chamber to be evacuated. Therefore it is useful to drive the vacuum pump with electrical energy and only switch it on when the absolute pressure in the vacuum chamber rises above a predetermined value.
- a generic motor-pump assembly is already known from DE 10 2007 005 223 A1, which is incorporated by reference.
- the automotive industry imposes very high requirements in relation to the acoustic comfort of motor vehicle components, and requires suppliers to provide robust, durable pumps with very low noise emission.
- the outlet channels are arranged in the working chamber covers and in the pump housing such that air expelled from the working chambers is conducted into an interior of the pump housing surrounding the crank drive.
- an air outlet unit is provided which allows a low-noise expulsion of air from the interior by deflection of the air.
- the interior also called the crank chamber, serves as a sound damping chamber since the expelled air is not conducted directly to the atmosphere. By deflecting the air in the air outlet unit, the noise level can be further substantially reduced so that blow-out noise is almost avoided.
- an aim of the present invention is to provide a motor-pump assembly which takes into account the rising requirements in relation to acoustic comfort.
- a resilient decoupling which damps a transmission to the roller bearing of vibrations in the connecting rod shank which occur on a force direction change on the rotation of the crank drive.
- An advantageous embodiment of the invention provides that for resilient decoupling, the roller bearing is provided resiliently embedded in the connecting rod eye. Thus the vibrations occurring on the rotation of the crank drive are only transmitted damped to the roller bearing.
- the resilient decoupling can be provided as an elastomer layer between the connecting rod eye and an outer ring of the roller bearing.
- the seating of the roller bearing in the connecting rod eye can in this way be achieved with no further components. Furthermore as a result a low bearing play can be provided in the roller bearing.
- the roller bearing can easily be integrated in the connecting rod eye in that the elastomer layer is created by injection molding around the roller bearing placed in the connecting rod eye.
- a further advantageous alternative embodiment of the invention provides that to receive the roller bearing, a connecting rod ring is provided which is resiliently embedded in the connecting rod eye.
- the connecting rod ring which is preferably made of metal can form the press joint to the roller bearing, and the bearing can be fixed as previously by pressing into the connecting rod.
- this production step can also be carried out in existing assembly lines without modification.
- the connecting rod ring is provided preferably fixed by injection molding with the elastomer layer.
- a lock can be provided between the connecting rod ring and connecting rod eye, whereby the fixing of the bearing can be ensured.
- a simple lock is achieved if a mechanical lock is provided between the connecting rod ring and connecting rod eye.
- This is preferably provided as a bayonet lock.
- a further advantageous embodiment of the invention provides that a resilient lock is provided between the connecting rod ring and connecting rod eye.
- the resilient lock is preferably formed by undercuts in the connecting rod ring into which the elastomer layer can flow for locking.
- a further improvement of the locking can be achieved according to a preferred embodiment in that on an inside of the connecting rod eye, protrusions are provided which are surrounded by the elastomer layer for locking.
- FIG. 1 a known motor-pump assembly in longitudinal section
- FIG. 2 a working diaphragm with fixed connecting rod of a first embodiment example according to the invention of a motor-pump assembly in a spatial depiction;
- FIG. 3 a section through the connecting rod eye of the connecting rod in FIG. 2 ;
- FIG. 4 a working diaphragm with fixed connecting rod of a second embodiment example according to the invention of a motor-pump assembly in spatial depiction;
- FIG. 5 a section through the connecting rod eye of the connecting rod according to FIG. 4 ;
- FIG. 6 a section through a connecting rod eye of a connecting rod of a third embodiment example according to the invention of a motor-pump assembly
- FIG. 7 a section through a connecting rod eye of a connecting rod of a fourth embodiment example according to the invention of a motor-pump assembly.
- FIG. 1 shows a known motor-pump assembly 1 in longitudinal section which comprises a pump 2 with a pump housing 5 and an electric motor 3 driving the pump 2 , wherein the motor 3 can be formed for example as a DC motor.
- the pump 2 is provided as a double diaphragm pump with two opposing working diaphragms 4 which are each clamped between the pump housing 5 and a working chamber cover 6 and thus delimit a working chamber 7 .
- the working diaphragms 4 are movable in opposition to each other by means of a crank drive 8 , which for each working diaphragm 4 has an eccentric 9 and a connecting rod 10 .
- the working chamber cover 6 has an upper cover 11 and a lower cover 12 which are welded, riveted or screwed together in an air-tight manner.
- Inlet and outlet valves are provided in the working chamber covers 6 .
- the air expelled from the outlet valve is conducted via an outlet channel in the working chamber cover 6 to an outlet channel in the pump housing 5 which are connected air-tightly by means of a sealing element.
- the two outlet channels in the pump housing 5 open into an inner chamber 22 of the pump housing 5 , the so-called crank chamber, which surrounds the crank drive 8 .
- An air outlet unit 13 provided in or on the pump housing 5 allows a low-noise blow-out of air from the inner chamber 22 so that the inner chamber 22 , which is also called the crank chamber, serves as a sound-damping chamber.
- the air outlet unit 13 comprises a non-return valve 20 having a one-piece or multipiece valve body 18 which prevents a back flow of air already expelled and the penetration of liquid or gaseous substances into the crank chamber 22 .
- the air outlet unit 13 has a filter element 17 arranged in a filter housing 14 , through which the air escapes to the atmosphere.
- the air outlet unit 13 comprises an air outlet cover 15 , an air outlet closing cap 16 and a valve body 18 , and is provided as a pre-mountable assembly.
- the air outlet cover 15 , the air outlet closing cap 16 and the filter housing 14 are each attached with screw elements 19 , 21 .
- the filter housing 14 is riveted to the air outlet cover 15 .
- further means can be provided which are advantageously integrated in the air outlet unit assembly 13 .
- the air outlet unit 13 can have an intermediate floor by means of which the air is deflected repeatedly as it flows through the air outlet unit 13 .
- several filter elements can be provided in the air outlet unit 13 .
- the non-return valve 20 opens in that the valve body 18 lifts at least partly from the continuous bores 23 in the filter housing 14 and the air can escape from the pump housing 5 to the atmosphere through openings (not shown) in the air outlet closing cap 16 and through the filter element 17 .
- connection not shown via which for example a connected brake booster is evacuated.
- a motor shaft 24 of the electric motor 3 is mounted in a first bearing (not shown) arranged in the motor 3 , and in a second bearing 25 , wherein the second bearing 25 is held partly by a motor housing 26 and partly by the pump housing 5 .
- the motor shaft 24 in this embodiment example serves simultaneously as an eccentric shaft 27 which carries the crank drive 8 with the eccentrics 9 and connecting rods 10 .
- a separate design of motor shaft 24 and eccentric shaft 27 is known.
- the working diaphragm 4 separates the working chamber 7 from the crank chamber 22 and is firmly connected with a tappet 28 , wherein the preferably non-deformable tappet 28 is injection molded with the resiliently deformable material of the diaphragm 4 .
- a portion 29 which is difficult to deform is produced in the center of the working diaphragm 4 and transforms towards the outside into an easily deformable portion 30 , which in turn transforms towards the outside into a diaphragm bead 31 which is connected firmly and air-tightly with the pump housing 5 .
- the tappet 28 can either be injection-molded with the material of the connecting rod 10 , firmly connected with the connecting rod 10 by means of a weld or threaded connection, or provided integrally with the connecting rod 10 .
- the connecting rods 10 are mounted movably on the eccentrics 9 by means of roller bearings 32 in the form of ball bearings.
- a motor-pump assembly according to the invention differs from the known motor-pump assembly 1 described in FIG. 1 substantially only in the structure of the connecting rods, so that the description of the remaining structure of the motor-pump assembly can be omitted.
- the connecting rods according to the invention can be used in the known motor-pump assembly 1 .
- their use is not restricted to the motor-pump assembly 1 described according to FIG. 1 , but in principle can also be provided in other assemblies.
- a force direction change in a connecting rod shank 37 of the connecting rod 10 occurs twice on every rotation of the crank drive 8 .
- a resilient decoupling is provided which eliminates or damps a transmission to the roller bearing 32 of vibrations in the connecting rod shank 37 which occur on a force direction change on the rotation of the crank drive 8 .
- the roller bearing 32 is resiliently embedded in the connecting rod eye 33 , 33 ′, 33 ′′ so that the vibrations occurring on rotation of the crank drive 8 are not transmitted or only transmitted damped to the roller bearing 32 .
- FIG. 2 shows a working diaphragm 4 with fixed connecting rod 10 of a first embodiment example according to the invention of a motor-pump assembly 1 in spatial depiction, wherein FIG. 3 shows a section through the connecting rod eye 33 of the connecting rod 10 .
- the resilient decoupling is provided as an elastomer layer 38 between the connecting rod eye 33 and the outer ring 35 of the roller bearing 32 . In this way the seat of the roller bearing 32 in the connecting rod eye 33 is implemented with no further components and a low bearing play can be provided in the roller bearing 32 .
- the roller bearing 32 is easily fixed in the connecting rod eye 33 by injection molding with the elastomer layer 38 around the roller bearing 32 placed in the connecting rod eye 33 .
- FIGS. 4 and 5 A second alternative embodiment is shown in FIGS. 4 and 5 , wherein FIG. 4 shows the working diaphragm 4 with fixed connecting rod 10 in spatial depiction, and FIG. 5 shows a section through the connecting rod eye 33 of the connecting rod 10 according to FIG. 4 .
- This alternative embodiment in contrast to the first embodiment example, provides that to receive the roller bearing 32 , a connecting rod ring 39 is provided which is resiliently embedded in the connecting rod eye 33 .
- the embedding is easily achieved by injection molding with the elastomer layer 38 around the connecting rod ring 39 .
- the connecting rod ring 39 which is preferably made of metal, provides the press joint to the outer ring 35 of the roller bearing 32 and the bearing can be fixed as previously by pressing into the connecting rod 10 , without any modification of existing assembly lines being required. With this embodiment of the bearing fixing it is not necessary to degrease the outer ring 35 before installation or injection molding.
- the subsequent press fitting prevents any lubricant present in the roller bearing 32 from escaping on embedding of the connecting rod ring 39 .
- FIGS. 6 and 7 Two further embodiment examples are shown in FIGS. 6 and 7 . These differ from the second embodiment example according to FIGS. 4 and 5 in that a lock is provided between a connecting rod ring 39 ′, 39 ′′ and the connecting rod eye 33 ′, 33 ′′, whereby the fixing of the roller bearing 32 can be ensured.
- a mechanical lock is provided between the connecting rod ring 39 ′ and the connecting rod eye 33 ′, which lock is provided for example as a bayonet lock which is elastomer-bonded by means of the elastomer layer 38 ′.
- FIG. 7 shows in cross section through the connecting rod eye 33 ′ of the fourth embodiment example a resilient lock between the connecting rod ring 39 ′′ and connecting rod eye 33 ′′.
- the resilient lock is formed by undercuts 41 in the connecting rod ring 39 ′′ into which the elastomer layer 38 ′′ can flow for locking, wherein a further improvement of the locking can be achieved in that on an inside of the connecting rod eye 33 ′′, protrusions 40 are provided which are also surrounded by the elastomer layer 38 ′′ for locking.
- the connecting rod ring 39 ′′ is a roller bearing inner ring.
Abstract
A motor-pump assembly for providing pressure for a motor vehicle brake system actuation device with a pneumatic brake booster, including a pump and an electric motor driving the pump. The pump is a double diaphragm pump with two opposing working diaphragms each clamped between a pump housing and a working chamber cover to delimit a working chamber and which are movable by a crank drive having an eccentric and connecting rods. The connecting rods each have a connecting rod shank and a connecting rod eye and are mounted movably on the eccentrics by roller bearings. To provide a motor-pump assembly which meets requirements relating to acoustic comfort, a resilient decoupling is provided between each connecting rod eye and the roller bearing, which damps transmission of vibrations to the roller bearing in the connecting rod shank which occur on a force direction change on the rotation of the crank drive.
Description
- This application is the U.S. National Phase Application of PCT/EP2011/062901, filed Jul. 27, 2011, which claims priority to German Patent Application No. 10 2010 062 160.9, filed Nov. 30, 2010, the contents of such applications being incorporated by reference herein.
- The invention concerns a motor-pump assembly, in particular for providing pressure for a brake actuation device of a motor vehicle brake system with a pneumatic brake booster, in particular a vacuum brake booster, comprising a pump and an electric motor driving the pump, wherein the pump is provided as a double diaphragm pump with two opposing working diaphragms which are each clamped between a pump housing and a working chamber cover and thus delimit a working chamber and which are movable by means of a crank drive having an eccentric and connecting rods, and wherein the connecting rods each have a connecting rod shank and a connecting rod eye of plastic and are mounted movably on the eccentrics by means of roller bearings.
- To provide a vacuum for a pneumatic brake booster, the interior of which is divided into at least one vacuum chamber and one working chamber, vacuum pumps are used which draw in residual air from the vacuum chamber and expel it to the atmosphere. Usually the automotive industry uses vane pumps or variable geometry vane pumps here. In principle these have a great deal of friction and must be lubricated to achieve an acceptable service life. Vacuum pumps with vanes driven by the internal combustion engine of the motor vehicle are therefore connected to the oil circuit of the combustion engine. However a significant proportion of the power emitted by the combustion engine must be used to drive such a pump. This also applies even when the vacuum is already fully formed in the chamber to be evacuated. Therefore it is useful to drive the vacuum pump with electrical energy and only switch it on when the absolute pressure in the vacuum chamber rises above a predetermined value.
- Furthermore in vehicles with electric or hybrid drives, the vacuum pump (sometimes) cannot be driven by the combustion engine. Therefore in these vehicles, electrically driven vacuum pumps are used.
- Equipping such an electrically driven pump with a lubricant circuit or connecting it to such a circuit would entail a disproportionally high expense. Thus for use in motor vehicles with brake systems with electrically driven vacuum pumps, only dry-running vacuum pumps can be used. For this in vane pumps the self-lubricating material graphite is used, from which the vanes can be produced with the necessary precision with high expense. Therefore efforts have been focused on using a diaphragm pump for electrical provision of a brake vacuum.
- A generic motor-pump assembly is already known from DE 10 2007 005 223 A1, which is incorporated by reference. The automotive industry imposes very high requirements in relation to the acoustic comfort of motor vehicle components, and requires suppliers to provide robust, durable pumps with very low noise emission. To meet these requirements, in the known motor-pump assembly, the outlet channels are arranged in the working chamber covers and in the pump housing such that air expelled from the working chambers is conducted into an interior of the pump housing surrounding the crank drive. Furthermore an air outlet unit is provided which allows a low-noise expulsion of air from the interior by deflection of the air. The interior, also called the crank chamber, serves as a sound damping chamber since the expelled air is not conducted directly to the atmosphere. By deflecting the air in the air outlet unit, the noise level can be further substantially reduced so that blow-out noise is almost avoided.
- Due to the increasing use of vehicles with electric drives, the acoustic requirements for the motor-pump assembly are rising further.
- Therefore an aim of the present invention is to provide a motor-pump assembly which takes into account the rising requirements in relation to acoustic comfort.
- This is achieved according to an aspect of the invention in that between each connecting rod eye and the roller bearing, a resilient decoupling is provided which damps a transmission to the roller bearing of vibrations in the connecting rod shank which occur on a force direction change on the rotation of the crank drive. Using the resilient decoupling according to the invention therefore the noise which occurs in the roller bearing by a force direction change on the rotation of the crank drive—in particular by overcoming the bearing play—and which is transmitted to an eccentric via the roller bearing can be minimized or eliminated.
- An advantageous embodiment of the invention provides that for resilient decoupling, the roller bearing is provided resiliently embedded in the connecting rod eye. Thus the vibrations occurring on the rotation of the crank drive are only transmitted damped to the roller bearing.
- Preferably the resilient decoupling can be provided as an elastomer layer between the connecting rod eye and an outer ring of the roller bearing. The seating of the roller bearing in the connecting rod eye can in this way be achieved with no further components. Furthermore as a result a low bearing play can be provided in the roller bearing.
- According to an advantageous embodiment of the invention the roller bearing can easily be integrated in the connecting rod eye in that the elastomer layer is created by injection molding around the roller bearing placed in the connecting rod eye.
- A further advantageous alternative embodiment of the invention provides that to receive the roller bearing, a connecting rod ring is provided which is resiliently embedded in the connecting rod eye. Thus the connecting rod ring which is preferably made of metal can form the press joint to the roller bearing, and the bearing can be fixed as previously by pressing into the connecting rod. Thus this production step can also be carried out in existing assembly lines without modification.
- In a simple manner the connecting rod ring is provided preferably fixed by injection molding with the elastomer layer.
- According to an advantageous embodiment of the invention, a lock can be provided between the connecting rod ring and connecting rod eye, whereby the fixing of the bearing can be ensured.
- According to an advantageous embodiment, a simple lock is achieved if a mechanical lock is provided between the connecting rod ring and connecting rod eye. This is preferably provided as a bayonet lock.
- A further advantageous embodiment of the invention provides that a resilient lock is provided between the connecting rod ring and connecting rod eye.
- The resilient lock is preferably formed by undercuts in the connecting rod ring into which the elastomer layer can flow for locking.
- A further improvement of the locking can be achieved according to a preferred embodiment in that on an inside of the connecting rod eye, protrusions are provided which are surrounded by the elastomer layer for locking.
- The invention is best understood from the following detailed description when read in connection with the accompanying drawing. Included in the drawings are the following figures:
-
FIG. 1 a known motor-pump assembly in longitudinal section; -
FIG. 2 a working diaphragm with fixed connecting rod of a first embodiment example according to the invention of a motor-pump assembly in a spatial depiction; -
FIG. 3 a section through the connecting rod eye of the connecting rod inFIG. 2 ; -
FIG. 4 a working diaphragm with fixed connecting rod of a second embodiment example according to the invention of a motor-pump assembly in spatial depiction; -
FIG. 5 a section through the connecting rod eye of the connecting rod according toFIG. 4 ; -
FIG. 6 a section through a connecting rod eye of a connecting rod of a third embodiment example according to the invention of a motor-pump assembly, and -
FIG. 7 a section through a connecting rod eye of a connecting rod of a fourth embodiment example according to the invention of a motor-pump assembly. -
FIG. 1 shows a known motor-pump assembly 1 in longitudinal section which comprises apump 2 with apump housing 5 and anelectric motor 3 driving thepump 2, wherein themotor 3 can be formed for example as a DC motor. - The
pump 2 is provided as a double diaphragm pump with two opposing workingdiaphragms 4 which are each clamped between thepump housing 5 and a workingchamber cover 6 and thus delimit a workingchamber 7. The workingdiaphragms 4 are movable in opposition to each other by means of acrank drive 8, which for each workingdiaphragm 4 has an eccentric 9 and a connectingrod 10. The workingchamber cover 6 has anupper cover 11 and alower cover 12 which are welded, riveted or screwed together in an air-tight manner. - Inlet and outlet valves (not shown) are provided in the working chamber covers 6. The air expelled from the outlet valve is conducted via an outlet channel in the
working chamber cover 6 to an outlet channel in thepump housing 5 which are connected air-tightly by means of a sealing element. The two outlet channels in thepump housing 5 open into aninner chamber 22 of thepump housing 5, the so-called crank chamber, which surrounds thecrank drive 8. Anair outlet unit 13 provided in or on thepump housing 5 allows a low-noise blow-out of air from theinner chamber 22 so that theinner chamber 22, which is also called the crank chamber, serves as a sound-damping chamber. Theair outlet unit 13 comprises anon-return valve 20 having a one-piece ormultipiece valve body 18 which prevents a back flow of air already expelled and the penetration of liquid or gaseous substances into thecrank chamber 22. - In addition the air-borne noise on expulsion of the air from the
inner chamber 22 is reduced in that theair outlet unit 13 has afilter element 17 arranged in afilter housing 14, through which the air escapes to the atmosphere. Furthermore theair outlet unit 13 comprises anair outlet cover 15, an airoutlet closing cap 16 and avalve body 18, and is provided as a pre-mountable assembly. Theair outlet cover 15, the airoutlet closing cap 16 and thefilter housing 14 are each attached withscrew elements filter housing 14 is riveted to theair outlet cover 15. To deaden the sound, further means can be provided which are advantageously integrated in the airoutlet unit assembly 13. For this theair outlet unit 13 can have an intermediate floor by means of which the air is deflected repeatedly as it flows through theair outlet unit 13. Furthermore several filter elements can be provided in theair outlet unit 13. - When the air pressure in the
interior 22 of thepump 2 is greater than the atmospheric pressure surrounding thepump 2, thenon-return valve 20 opens in that thevalve body 18 lifts at least partly from thecontinuous bores 23 in thefilter housing 14 and the air can escape from thepump housing 5 to the atmosphere through openings (not shown) in the airoutlet closing cap 16 and through thefilter element 17. - Furthermore on the
pump housing 5 is provided a connection not shown via which for example a connected brake booster is evacuated. - It is further evident from
FIG. 1 that amotor shaft 24 of theelectric motor 3 is mounted in a first bearing (not shown) arranged in themotor 3, and in asecond bearing 25, wherein thesecond bearing 25 is held partly by amotor housing 26 and partly by thepump housing 5. Thus an advantageous centering ofmotor 3 and pump 2 is achieved. Themotor shaft 24 in this embodiment example serves simultaneously as aneccentric shaft 27 which carries thecrank drive 8 with theeccentrics 9 and connectingrods 10. However a separate design ofmotor shaft 24 andeccentric shaft 27 is known. - The working
diaphragm 4 separates the workingchamber 7 from thecrank chamber 22 and is firmly connected with a tappet 28, wherein the preferably non-deformable tappet 28 is injection molded with the resiliently deformable material of thediaphragm 4. Thus in the vicinity of the tappet 28, aportion 29 which is difficult to deform is produced in the center of the workingdiaphragm 4 and transforms towards the outside into an easilydeformable portion 30, which in turn transforms towards the outside into adiaphragm bead 31 which is connected firmly and air-tightly with thepump housing 5. The tappet 28 can either be injection-molded with the material of the connectingrod 10, firmly connected with the connectingrod 10 by means of a weld or threaded connection, or provided integrally with the connectingrod 10. The connectingrods 10 are mounted movably on theeccentrics 9 by means ofroller bearings 32 in the form of ball bearings. - The embodiment examples described below of a motor-pump assembly according to the invention differ from the known motor-pump assembly 1 described in
FIG. 1 substantially only in the structure of the connecting rods, so that the description of the remaining structure of the motor-pump assembly can be omitted. In other words, the connecting rods according to the invention can be used in the known motor-pump assembly 1. However their use is not restricted to the motor-pump assembly 1 described according toFIG. 1 , but in principle can also be provided in other assemblies. - The same components carry the same reference numerals.
- Due to the increased use of vehicles with electric drives, the acoustic requirements imposed on the motor-pump assembly 1 are rising, so that the object to be achieved is to meet the growing requirements for acoustic comfort.
- A force direction change in a connecting
rod shank 37 of the connectingrod 10 occurs twice on every rotation of thecrank drive 8. Due to the bearing play in theroller bearing 32 in the form of a ball bearing, anouter ring 35 of theroller bearing 32—which in known assemblies is press-fitted with a connectingrod eye 33 of the connectingrod 10—impacts with high dynamic on theroller body 36 and a rotatinginner ring 34, wherein the excitations occurring are transmitted to theeccentric 9. - Therefore in all four embodiment examples described according to
FIGS. 2 to 7 , between the connectingrod eye roller bearing 32, a resilient decoupling is provided which eliminates or damps a transmission to theroller bearing 32 of vibrations in the connectingrod shank 37 which occur on a force direction change on the rotation of thecrank drive 8. - For this the embodiments provide that for resilient decoupling, the
roller bearing 32 is resiliently embedded in the connectingrod eye crank drive 8 are not transmitted or only transmitted damped to theroller bearing 32. -
FIG. 2 shows a workingdiaphragm 4 with fixed connectingrod 10 of a first embodiment example according to the invention of a motor-pump assembly 1 in spatial depiction, whereinFIG. 3 shows a section through the connectingrod eye 33 of the connectingrod 10. It is evident fromFIG. 3 in particular that the resilient decoupling is provided as anelastomer layer 38 between the connectingrod eye 33 and theouter ring 35 of theroller bearing 32. In this way the seat of theroller bearing 32 in the connectingrod eye 33 is implemented with no further components and a low bearing play can be provided in theroller bearing 32. - The
roller bearing 32 is easily fixed in the connectingrod eye 33 by injection molding with theelastomer layer 38 around theroller bearing 32 placed in the connectingrod eye 33. - A second alternative embodiment is shown in
FIGS. 4 and 5 , whereinFIG. 4 shows the workingdiaphragm 4 with fixed connectingrod 10 in spatial depiction, andFIG. 5 shows a section through the connectingrod eye 33 of the connectingrod 10 according toFIG. 4 . - This alternative embodiment, in contrast to the first embodiment example, provides that to receive the
roller bearing 32, a connectingrod ring 39 is provided which is resiliently embedded in the connectingrod eye 33. The embedding is easily achieved by injection molding with theelastomer layer 38 around the connectingrod ring 39. Thus the connectingrod ring 39, which is preferably made of metal, provides the press joint to theouter ring 35 of theroller bearing 32 and the bearing can be fixed as previously by pressing into the connectingrod 10, without any modification of existing assembly lines being required. With this embodiment of the bearing fixing it is not necessary to degrease theouter ring 35 before installation or injection molding. - Also the subsequent press fitting prevents any lubricant present in the
roller bearing 32 from escaping on embedding of the connectingrod ring 39. - Two further embodiment examples are shown in
FIGS. 6 and 7 . These differ from the second embodiment example according toFIGS. 4 and 5 in that a lock is provided between a connectingrod ring 39′, 39″ and the connectingrod eye 33′, 33″, whereby the fixing of theroller bearing 32 can be ensured. - As evident from the section through the connecting
rod eye 33′ according toFIG. 6 , a mechanical lock is provided between the connectingrod ring 39′ and the connectingrod eye 33′, which lock is provided for example as a bayonet lock which is elastomer-bonded by means of theelastomer layer 38′. - In contrast,
FIG. 7 shows in cross section through the connectingrod eye 33′ of the fourth embodiment example a resilient lock between the connectingrod ring 39″ and connectingrod eye 33″. The resilient lock is formed byundercuts 41 in the connectingrod ring 39″ into which theelastomer layer 38″ can flow for locking, wherein a further improvement of the locking can be achieved in that on an inside of the connectingrod eye 33″,protrusions 40 are provided which are also surrounded by theelastomer layer 38″ for locking. It is also possible here that the connectingrod ring 39″ is a roller bearing inner ring. - 1 Motor-pump assembly
- 2 Pump
- 3 Motor
- 4 Working diaphragm
- 5 Pump housing
- 6 Working chamber cover
- 7 Working chamber
- 8 Crank drive
- 9 Eccentric
- 10 Connecting rod
- 11 Upper cover
- 12 Lower cover
- 13 Air outlet unit
- 14 Filter housing
- 15 Air outlet cover
- 16 Air outlet closing cap
- 17 Filter element
- 18 Valve body
- 19 Screw element
- 20 Non-return valve
- 21 Screw element
- 22 Interior
- 23 Continuous bore
- 24 Motor shaft
- 25 Bearing
- 26 Motor housing
- 27 Eccentric shaft
- 28 Tappet
- 29 Portion
- 30 Portion
- 31 Sealing bead
- 32 Roller bearing
- 33 Connecting rod eye
- 34 Inner ring
- 35 Outer ring
- 36 Roller body
- 37 Connecting rod shank
- 38 Elastomer layer
- 39 Connecting rod ring
- 40 Protrusion
- 41 Undercut
Claims (13)
1.-12. (canceled)
13. A motor-pump assembly for providing pressure for a brake actuation device of a motor vehicle brake system with a pneumatic brake booster, in particular a vacuum brake booster, comprising a pump and an electric motor driving the pump, wherein the pump is provided as a double diaphragm pump with two opposing working diaphragms which are each clamped between a pump housing and a working chamber cover and thus delimit a working chamber and which are movable by a crank drive having an eccentric and connecting rods, and wherein the connecting rods each have a connecting rod shank and a connecting rod eye and are mounted movably on the eccentrics by roller bearings, wherein between each connecting rod eye and the roller bearing, a resilient decoupling is provided which damps a transmission to the roller bearing of vibrations in the connecting rod shank which occur on a force direction change on the rotation of the crank drive.
14. The motor-pump assembly as claimed in claim 13 , wherein for resilient decoupling, the roller bearing is provided resiliently embedded in the connecting rod eye.
15. The motor-pump assembly as claimed in claim 14 , wherein the resilient decoupling is provided as an elastomer layer between the connecting rod eye and an outer ring of the roller bearing.
16. The motor-pump assembly as claimed in claim 15 , wherein the elastomer layer is created by injection molding around the roller bearing placed in the connecting rod eye.
17. The motor-pump assembly as claimed in claim 13 , wherein to receive the roller bearing, a connecting rod ring is provided which is resiliently embedded in the connecting rod eye.
18. The motor-pump assembly as claimed in claim 17 , wherein the connecting rod is provided fixed by injection molding with the elastomer layer.
19. The motor-pump assembly as claimed in claim 17 , wherein a lock is provided between the connecting rod ring and the connecting rod eye.
20. The motor-pump assembly as claimed in claim 19 , wherein a mechanical lock is provided between the connecting rod ring and the connecting rod eye.
21. The motor-pump assembly as claimed in claim 20 , wherein the mechanical lock is a bayonet lock.
22. The motor-pump assembly as claimed in claim 19 , wherein a resilient lock is provided between the connecting rod ring and the connecting rod eye.
23. The motor-pump assembly as claimed in claim 22 , wherein the resilient lock is formed by undercuts in the connecting rod ring into which the elastomer layer can flow for locking.
24. The motor-pump assembly as claimed in claim 23 , wherein on an inside of the connecting rod eye, protrusions are provided which are surrounded by the elastomer layer for locking.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010062160.9 | 2010-11-30 | ||
DE102010062160A DE102010062160A1 (en) | 2010-11-30 | 2010-11-30 | Motor-pump unit |
PCT/EP2011/062901 WO2012072282A1 (en) | 2010-11-30 | 2011-07-27 | Motor-pump assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140119961A1 true US20140119961A1 (en) | 2014-05-01 |
Family
ID=44534346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/990,104 Abandoned US20140119961A1 (en) | 2010-11-30 | 2011-07-27 | Motor-pump assembly |
Country Status (6)
Country | Link |
---|---|
US (1) | US20140119961A1 (en) |
EP (1) | EP2646302B1 (en) |
KR (1) | KR20130131393A (en) |
CN (1) | CN103237702B (en) |
DE (1) | DE102010062160A1 (en) |
WO (1) | WO2012072282A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10493971B2 (en) | 2014-08-22 | 2019-12-03 | Continental Teves Ag & Co. Ohg | Electric motor-pump assembly |
US11078895B2 (en) | 2017-04-28 | 2021-08-03 | Zf Cv Systems Hannover Gmbh | Compressor assembly for a compressed-air feed of a compressed-air supply system |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10330094B2 (en) | 2013-08-26 | 2019-06-25 | Blue-White Industries, Ltd. | Sealing diaphragm and methods of manufacturing said diaphragm |
DE102017216014A1 (en) * | 2017-09-12 | 2019-03-14 | Robert Bosch Gmbh | Hydraulic unit of a vehicle brake system with an eccentric chamber |
DE102018128557A1 (en) * | 2018-11-14 | 2020-05-14 | Wabco Gmbh | Reciprocating machine, compressed air supply system, vehicle and method for producing a reciprocating machine |
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US5080501A (en) * | 1991-04-04 | 1992-01-14 | Metallized Carbon Corporation | Bayonet held bearing hanger assembly |
US20050238513A1 (en) * | 2004-04-24 | 2005-10-27 | Arnold Mueller | Double piston for a compressor |
US20100045096A1 (en) * | 2006-02-10 | 2010-02-25 | Continental Teves Ag & Co. Ohg | Motor/Pump Assembly |
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US2244197A (en) * | 1936-03-25 | 1941-06-03 | Hessler Christian Rudolph | Bearing |
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CN1085296A (en) * | 1992-10-08 | 1994-04-13 | 洛阳工学院 | Rolling bearing made of new material and autofrettage thereof |
DE4241826A1 (en) * | 1992-12-11 | 1994-08-25 | Teves Gmbh Alfred | High-pressure pump having a radial piston and an attenuation layer |
DE4241825A1 (en) * | 1992-12-11 | 1994-06-16 | Teves Gmbh Alfred | Radial piston pump for controlled brake systems - has elastomeric damping layer between drive shaft and piston |
DE19645530C2 (en) * | 1996-11-05 | 1999-12-16 | Freudenberg Carl Fa | roller bearing |
JP2004360639A (en) * | 2003-06-06 | 2004-12-24 | Nsk Ltd | Bearing unit for vacuum pump and vacuum pump |
JP2006063874A (en) * | 2004-08-26 | 2006-03-09 | Ulvac Kiko Inc | Diaphragm type vacuum pump |
JP2008111519A (en) * | 2006-10-31 | 2008-05-15 | Toyota Industries Corp | Bearing structure for rotary machine |
DE102007060968A1 (en) * | 2007-01-11 | 2008-07-17 | Ab Skf | Bearing arrangement for a carrying roller |
DE102008005820A1 (en) * | 2007-09-11 | 2009-03-12 | Continental Teves Ag & Co. Ohg | Motor-pump unit |
CN101886664B (en) * | 2009-05-14 | 2012-08-01 | 上海浦东高桥试验机厂有限公司 | Manufacturing method of bearing component |
-
2010
- 2010-11-30 DE DE102010062160A patent/DE102010062160A1/en not_active Withdrawn
-
2011
- 2011-07-27 CN CN201180057567.7A patent/CN103237702B/en active Active
- 2011-07-27 WO PCT/EP2011/062901 patent/WO2012072282A1/en active Application Filing
- 2011-07-27 KR KR1020137017067A patent/KR20130131393A/en not_active Application Discontinuation
- 2011-07-27 EP EP11736104.8A patent/EP2646302B1/en active Active
- 2011-07-27 US US13/990,104 patent/US20140119961A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5080501A (en) * | 1991-04-04 | 1992-01-14 | Metallized Carbon Corporation | Bayonet held bearing hanger assembly |
US20050238513A1 (en) * | 2004-04-24 | 2005-10-27 | Arnold Mueller | Double piston for a compressor |
US20100045096A1 (en) * | 2006-02-10 | 2010-02-25 | Continental Teves Ag & Co. Ohg | Motor/Pump Assembly |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10493971B2 (en) | 2014-08-22 | 2019-12-03 | Continental Teves Ag & Co. Ohg | Electric motor-pump assembly |
US11078895B2 (en) | 2017-04-28 | 2021-08-03 | Zf Cv Systems Hannover Gmbh | Compressor assembly for a compressed-air feed of a compressed-air supply system |
Also Published As
Publication number | Publication date |
---|---|
WO2012072282A1 (en) | 2012-06-07 |
KR20130131393A (en) | 2013-12-03 |
EP2646302B1 (en) | 2016-05-04 |
CN103237702A (en) | 2013-08-07 |
CN103237702B (en) | 2016-11-16 |
EP2646302A1 (en) | 2013-10-09 |
DE102010062160A1 (en) | 2012-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CONTINENTAL TEVES AG & CO. OHG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STEINER, STEFAN;KONIG, HARALD;RUFFER, MANFRED;AND OTHERS;SIGNING DATES FROM 20130922 TO 20130930;REEL/FRAME:032047/0880 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |