MX2008010065A - Motor/pump assembly - Google Patents

Abstract

In order to provide a motor/pump assembly (1, 101), comprising a dry-running pump (2, 102), which meets high requirements in relation to acoustic comfort, it is proposed according to the invention that the outlet channels (13, 113) are provided arranged in the working-space covers (6, 106) and in the pump housing (5, 105) in such a way that air which is expelled from the working spaces (7, 107) is routed into an inner space (28, 128) of the pump housing (5, 105), and that an air outlet unit (29, 129) is provided which makes low-noise expelling of the air possible from the inner space (28, 128).

Description

ASSEMBLY OF ENGINE AND PUMP The present invention relates to an assembly of the motor and pump, in particular to provide pressure for a brake activation device of a motorized brake system with a pneumatic brake booster, in particular a force multiplier of vacuum, comprising a pump and an electric motor that drives the pump, with the pump being designed as a double diaphragm pump with two opposing working diaphragms which are compressed in each case between a pump housing and a chamber cover work and for that reason delimits a working chamber and moves by means of an articulated mechanism that includes eccentrics and connecting rods, where an inlet channel with an inlet valve and an outlet channel with an outlet valve is associated with each working camera. To make the vacuum available for a pneumatic brake booster whose interior is subdivided into at least one vacuum chamber and one working chamber, vacuum pumps are used that draw residual air out of the vacuum chamber and expel it into the atmosphere . Blade type pumps or wing pumps are typically used for this purpose in the automotive industry. Due to their principle, these pumps suffer from too much friction and need lubrication to achieve an acceptable useful life. Vacuum pumps with blades that are driven by an internal combustion engine of the motor vehicle are therefore connected to the oil circulation of the internal combustion engine. However, an appreciable portion of the power produced by the internal combustion engine is required to drive a pump of this type. And this is still necessary when the vacuum in the chamber to be evacuated is already fully developed. Therefore, it is appropriate to operate the vacuum pump with electric power and turn it on only when the absolute pressure in the vacuum chamber rises in excess of a predetermined value. In addition, it is possible in vehicles with a hybrid or electric mechanism that the vacuum pump is not operated at all or is not operated temporarily by an internal combustion engine. For this reason, vacuum pumps driven electrically in these vehicles are used. This would involve extremely large expenses to equip such an electrically driven pump with a lubricating cycle or to connect it in such a cycle. Therefore, only vacuum pumps that operate dry are backed up for use in motor vehicles with brake systems equipped with an electrically driven vacuum pump. For this purpose, the graphite of self-lubricating material is used in vane-type pumps, and the blades are made of this material with the necessary precision and require great expense. Therefore, the efforts are directed to the use of a diaphragm pump for the electric supply of a vacuum brake. Diaphragm pumps are generally known. DE 35 29 978 A1 describes an assembly of the motor and pump comprising a double diaphragm pump with a rotating eccentric shaft driven by an electric motor. The automotive industry presents very high demands on the acoustic comfort of the applications and components of the motor vehicle of long-lasting pumps, and solid of the suppliers with very low noise emissions. These requests can not be satisfied by the diaphragm pumps of the prior art due to vibrations or require large expenses in sound absorption measurements, respectively. It is an object of the invention to provide an engine and pump assembly comprising a pump that operates dry and meets high demands with respect to acoustic comfort. Another object of the invention is to improve the assembly of the motor and pump in terms of its pump effect. According to the invention, this objective is achieved in that the exit channels in the covers of the working chamber and in the pump housing are arranged in such a way that the air displaced from the working chambers is routed to the space inside of the pump housing, and in that the air outlet unit is provided which allows the air to be expelled from the interior space at a low noise. The interior space, also referred to as the crankcase, thus functions as a sound absorbing space because the expelled air is not routed directly to the atmosphere, thus preventing the development of exhaust noise. Preferably, the air outlet unit includes means for absorbing the sound. This allows to reduce the air sound when the air comes out of the air outlet unit. According to a favorable embodiment of the invention, the air outlet unit closes an opening in the wall of the pump housing in a sealing mode. In this way, the opening can perform the function of a mounting window during assembly of the motor and pump assembly, whereby assembly can be considerably facilitated. Another way of facilitating the installation is achieved in accordance with a favorable improvement of the invention in that the air outlet unit comprises a filter housing, a filter, an air outlet cover, an outlet cover air as well as a valve member and is provided as a subassembly that can be preassembled.

The return fluid of the exhausted air and the inlet of fluid or gaseous substances in the air outlet unit are preferably prevented because the air outlet cover, the closing cover of the air outlet and the valve member form a valve no return. Alternatively, the air outlet cover, the air outlet closure cover and the valve member form the non-return valve. A subassembly is produced in a captive manner according to a favorable mode because the filter housing is riveted to the air outlet cover. Preferably, the air outlet cover can be adjusted to the wall by means of screw elements, whereby a sealed connection is made possible in a simple manner. According to a favorable improvement of the invention, the two input channels are interconnected through channels designed in the pump housing and have a common port. A second port is unnecessary, with the result that the mounting space of the motor and pump assembly can be used. The port preferably includes means for adjusting a hose. For example, it is feasible according to a favorable mode that the port is designed as an air intake fitting.

According to another favorable embodiment of an engine and pump assembly according to the invention, an adapter is provided which fits into a sealing mode in the port and includes an adapter outlet, with the adapter outlet including means for attaching a hose. This allows adapting the adapter to individual customer requests without requiring modification of the pump housing. Preferably, the adapter can be placed in the connection by means of a closing coupling, or to be rotatable by means of bolt-like elements, said bolt-like elements are engaged in an outer notch of the adapter. To achieve an assembly of the motor and pump for most of the various installation conditions, the pump housing according to a favorable embodiment of the invention includes two opposing ports, and a port remains closed. For this purpose, one of the ports can be closed hermetically by means of a shutter, or one of the connections remains closed during manufacture and will open only by drilling, for example, if necessary. Preferably, the pump housing can be made of plastic or aluminum, and the pump housing made of plastic allows to achieve a low weight of the motor and pump assembly. On the other hand, an aluminum pump housing allows a good thermal dissipation of the motor, in this way the life of the motor is extended. Also the cover of the working chamber can be made of plastic or aluminum, whereby the manufacture of the cover of the working chamber can be simplified. The assembly is simplified according to a favorable embodiment because the inlet valve and outlet valve of a working chamber are each provided as a valve unit which can be preassembled. It is possible in this context to achieve a further simplification of the assembly because the previously assembled valve unit can be integrated into the working chamber cover and together with this forms a working chamber cover unit ready to be installed. According to a favorable design of the invention, the work chamber cover includes an upper lid and a lower lid which are interconnected in a sealing mode, with the valves being provided between the upper lid and the lower lid. This allows the valves to be mounted in a simple manner. Preferably, the upper cover is fixed or screwed to the lower cover. As a result, the top cover can simultaneously focus on the bottom cover without additional means. According to a favorable embodiment of the invention, A simple fabrication of the working chamber cover is achieved insofar as the inlet channel is designed in the upper cover and the outlet channel is provided between the upper cover and the lower cover. The optimum use of the cross-sectional area of an orifice of the inlet valve is preferably obtained by an inlet channel in the area of the inlet valve which is divided into several single channels which are arranged in a circular manner around a central line of the inlet valve. Preferably, the inlet valve and the outlet valve are arranged crosswise in the symmetry axes of the pump, in this way it is possible to design the work chamber cover in a way that optimizes the mounting space. The valves are preferably provided as plate valves with a valve disc. To facilitate the assembly of valve discs, bolts placed in the lower cover for positioning valve discs are provided in accordance with a favorable improvement of the invention. The lower cover includes cover openings of the working chamber which are preferably located on the inlet valve and the outlet valve, and the cover openings of the working chamber are arranged in a circular manner around the central line of the working chamber. the valves. As a result, the allegedly damaging volume can be minimized as much as possible without reducing the volume penetrating the apertures of the working chamber cover. According to a favorable improvement of the invention, the inlet and outlet channels are arranged in the pump housing in such a way that the two covers of the working chamber have an identical design. In this way it is possible to provide the covers of the working chamber with an equal configuration on both sides of the pump, and it is not necessary to keep two different work chamber covers in existence. Preferably, space adjustment means are provided to adjust the distance between the covers of the working chamber and the working diaphragm, thereby allowing manufacturing tolerances and mounting tolerances to be compensated. The space adjustment means may be provided in a simple mode when, according to a favorable mode, the space adjustment means are provided by an adjustable connection between the connecting rod and a tappet connected to the working diaphragm. Another favorable embodiment of the invention calls for space adjustment means for adjusting the distance between the covers of the working chamber and the pump housing. As a result, it is possible in the same way to compensate the manufacturing tolerances as well as the mounting tolerances. For example, the distance can be adjusted by means of a welded joint, or it occurs by means of a screw coupling between the working chamber cover and the pump housing. The articulated mechanism is centered within a pump housing in an advantageous mode insofar as one motor shaft of an electric motor is mounted in a first bearing arranged in the motor and a second bearing, with the second bearing being partly accommodated in an engine housing and partly in the pump housing, and to the extent that one end of the motor shaft projects into the pump housing. This ignores the need for an additional mounting bracket for the motor shaft in the pump housing. The number of unique parts is preferably reduced because the articulated mechanism (eccentrics and connecting rods) is arranged in the motor shaft. This eliminates the need for an additional eccentric shaft. According to a favorable embodiment, it is also feasible, however, for the articulated mechanism (eccentric and connecting rods) to be arranged on an eccentric shaft, which is connected to the motor shaft by means of a screw coupling, with central lines of the shaft of the motor and the eccentric shaft being in alignment with each other. In order to protect the proper functioning of the motor and pump assembly, it is preferably established that the center points of the eccentrics are disposed diametrically in relation to a central line of the motor shaft or the eccentric shaft. As a result, the reaction forces of the oscillating masses can be almost balanced. Another reduction of the component can be achieved to the extent that the eccentrics are designed in one piece as a double eccentric. According to a favorable improvement of the motor and pump assembly of the invention, the pump housing and the covers of the working chamber include means for the defined positioning of the covers of the working chamber in the pump housing for the improved mounting of the cover of the working chamber. Preferably, the motor and pump assembly are activated by means of an electronic control unit that depends on a signal from a sensor, which detects a difference in pressure between the vacuum chamber and the working chamber or an absolute pressure in the chamber of vacuum of the brake booster. The connecting rods may be made of plastic in an optimum weight mode when the connecting rods include support rings molded by injection in the area of a connecting rod eye to stabilize the ball bearings according to a preferred embodiment. In a favorable alternative, the connecting rods include a groove in the area of the connecting rod eyelet, allowing the ball bearings to be elastically contained. In this way it is unnecessary to injection-molded the mentioned support rings. Additional features, advantages and possible applications of the invention may be taken from the following description of the various embodiments and by means of the accompanying drawings. In the drawings: Figure 1 is a three-dimensional view of a first embodiment of an assembly of the motor and pump of the invention; Figure 2 shows the assembly of the motor and pump according to Figure 1 in a longitudinal cross section taken through a first plane; Figure 3 shows a partial view of an assembly of the motor and pump according to Figure 1 in a longitudinal cross section taken through a second plane; Figure 4 is a three-dimensional view of a second embodiment of an engine and pump assembly according to the invention; Figure 5 shows the assembly of the motor and pump according to Figure 4 in a longitudinal cross section taken through a first plane; Figure 6 shows a working chamber cover of the motor and pump assembly according to Figure 4 in a longitudinal cross section taken through a second plane, and Figure 7 is another embodiment of the connecting rod of an assembly of the motor and pump according to the invention. Figure 1 shows a three-dimensional view of a first embodiment of an assembly 1 of the engine and pump of the invention that is provided, for example, for supplying vacuum to a brake activation device of a motor vehicle brake system with a booster of pneumatic brake (not shown). The assembly 1 of the motor and pump comprises a pump 2 with a pump housing 5 and an electric motor 3 which drives the pump 2 and can for example be designated as a direct current motor. As can be taken from Figure 2 in particular showing the assembly of the motor and pump in the longitudinal cross section taken through a first plane, the pump 2 is designated as a double diaphragm pump with two opposing working diaphragms 4 they compress in each case between the pump housing 5 and the cover 6 of the working chamber, thus delimiting a working chamber 7. The working diaphragms 4 are movable in an opposite direction by means of an articulated mechanism 8, which comprises an eccentric 9 and a connecting rod 10 for the working diaphragm 4. As can be seen in Figure 3, which illustrates a partial view of the assembly 1 of the engine and pump in a cross section taken through a second plane, each of the input channels 11 with an inlet valve 12 as well as a channel Output 13 with an output valve 14 is associated with each working chamber 7. The inlet valve 12 and the outlet valve 14 are designed as a non-return valve and in each case comprise a valve fitting 15, 16 and a valve disk 17, 18, with the inlet valve and the valve 12, 14 which are provided as a preassembled valve unit 20 and which can be mounted in a recess 19 of the cover 6 of the working chamber to provide, in turn, a work chamber cover unit 21 ready to be assembled. In this way, the valve unit 20 and the cover unit 21 of the working chamber can be preassembled as a subassembly, thereby facilitating assembly of the motor and pump assembly 1.

The valve fitting 15 of the inlet valve 12 includes a bolt-shaped portion projecting into a corresponding recess in the work chamber cover 6 after the valve unit 20 has been mounted on the chamber cover 6 of work. This location makes it possible to facilitate the assembly of the valve unit 20. Further as can be taken from Figure 3, the fitting 16 of the outlet valve 14 also has a bolt-shaped portion projecting into a corresponding recess of the valve fitting 15 of the inlet valve 12 after the formation of the subassembly. The valve unit 20 can be secured in the work chamber cover 6 for example by means of a screw coupling 22. In addition, the recess 19 is sealed in a sealed manner by means of a flap valve 23 which a screw element 24 fits in the work chamber cover unit 21. The two input channels 11 of the two working chambers 7 are interconnected by means of channels 54 which extend in the pump housing 5 and open in a common port 25 in the pump housing 5 which, in turn, it is connected through a vacuum hose (not shown) with a vacuum chamber of the brake booster (not shown), and the port 25 can be designated for example as an air intake fitting that fits tightly into the housing 5 of pump. Depending on the mounting conditions in the motor vehicle, this air intake fitting can have a straight or angular design and the seal in the pump housing 5 can be rotatable or fixed. As can be seen in Figures 2 and 3, according to the illustrated embodiment, an input channel 11 can divide the input valve 12 into several smaller input channels 26, which are arranged in a circular fashion around a central line A of the valve unit 20 and opening in the working chamber 7 by means of a single channel 27. Because the volume of the channel 27 belongs to the so-called harmful volume, that is, the residual volume remaining in the exhaust action, only a single channel 27 is provided to minimize the harmful volume. The working chamber 7, whose volume is very low in the illustrated position of the working diaphragm 4, ie tends preferably to zero, will increase in the rotation of the articulated mechanism 8, with the result that the pressure in the chamber 7 of The work diminishes to such an extent that part of the residual air that exists in the vacuum chamber of the brake booster is sucked into the working chamber 8 through the port 25 and the inlet channel 11. The valve disc 18 of the inlet valve 12 opens due to the suction action. The inlet valve 12 closes and the outlet valve 14 opens when the working chamber 7 decreases due to the continuous rotation of the articulated mechanism 8. As it happens, the sucked residual air escapes from the working chamber 7 through the channel 27 and the exit channel 13. As can be taken from Figure 3 in particular, the outlet channel 13 is arranged so that in the cover 6 of the working chamber and the pump housing 5 the air displaced from the working chamber 7 is supplied in a space 28 internal of the pump housing 5. An air outlet unit 29 provided in the pump housing 5 allows the escape of air with low noise out of the internal space 28. The internal space 28, also referred to as crankcase, therefore functions as a sound absorbing chamber. The air outlet unit 29 comprises a non-return valve 49 with a multi-part or single-part valve member 34, preventing the return flow of the already exhausted air and the ingress of the gaseous fluid or substances into the crankcase 28. Further, at the air outlet outside the internal space 28, the air sound is reduced because the air outlet unit 29 includes a filter 31 disposed in the filter housing 30, through which the air outlets in the atmosphere are filtered. In addition, the air outlet unit 29 comprises an air outlet cover 32, an air outlet closure cap 33 and a valve member 34 and can be provided as a subassembly that can be preassembled. The air outlet cover 32, the air outlet closure cap 33 and the filter housing 30 are respectively connected to the screw elements 35, 36, 37. For purposes of noise absorption, additional means that are favorably integrated in the air outlet unit 29 of the subassembly can be provided. When the air pressure in the internal space 28 of the pump 8 becomes higher than the atmospheric pressure encompassed by the pump 2, the non-return valve 49 will open to the extent that the valve member 34 rises at least partially from through holes 38 in the air outlet cover 32 and air can escape from the pump housing 5 in the atmosphere through openings not illustrated in the air outlet closure cap 33 and through the filter 31. On the other In this way, the pressure in the internal space 28 of the pump 2 can increase in excess of the atmosphere only by the low differential pressure value that is required to open the non-return valve 49 and, on the other hand, the pressure in the internal space 28 it experiences periodic fluctuations in the cycle of change in the volume of the internal space that accompanies the movement of the crankshaft. The result is the pressure of the internal space temporarily averaged under atmospheric pressure. In addition, it can be seen in Figure 2 that a motor shaft 39 of the electric motor 3 is mounted in a first bearing not illustrated in the motor 3 and in a second bearing 40, with the second bearing 40 being arranged partly in a housing 41 of the motor and partly in the pump housing 5, and an end 42 of the motor shaft projects into the pump housing 5. An eccentric shaft 43 rigidly coupled to the motor shaft 39 carries the mechanism 8 articulated with the eccentrics 9 and the connecting rods 10, with central lines M, E of the motor shaft 39 and the eccentric shaft 43 which are aligned each. There is no need for an additional mounting bracket of the shaft 39 of the eccentric shaft motor 43 in the pump housing 5 because the aforementioned attachment of the second bearing 40 in the motor housing 41 and in the pump housing 5 ensures the necessary centering of the mechanism 8 articulated within the pump housing 5. It is possible as in another embodiment to replace an extension of the motor shaft 39 for the eccentric shaft 43, that is, to provide a motor and eccentric shafts 39, 43 in an integral design. To ensure the proper functioning of the motor and pump assembly 1, the center points of the eccentrics 9 in relation to the center line E of the eccentric shaft 43 are arranged diametrically as well as in an equal distance. As a result, the reaction forces of the oscillating masses of the working diaphragms 4, of the connecting rods 10 and eccentrics 9 can be almost balanced because the common point of gravity remains at rest, at least in approximation, at each phase of your movement. The remaining negligible deviation from an ideal mass balance is due to the fact that the two eccentrics 9, as shown in Figure 2, are arranged to be axially balanced, while the working diaphragms 4 move at the same axial level. Advantageously, the eccentrics 9 can be integrally designed as a double eccentric, which is arranged, for example, by snap-fitting on the eccentric shaft 43. In another favorable design, the double eccentric is produced by pressurizing the eccentric shaft 43 into two unique disc-shaped eccentrics 9 which rotate 180 ° to each other. It has advantage for the simplified assembly of the motor and pump assembly 1 to join the eccentric shaft 43 and the motor shaft 39 within the pump housing 5. For this end, the eccentric shaft 43 and its extreme proximity to the motor includes a screw coupling in the form of an internal thread and an external thread. To allow a tool to be placed to seal the screw coupling, at least one tool contact surface is provided on the motor or on the end of the free shaft. In addition, it is feasible for this purpose to provide the free end with a polygonal configuration. It can be seen in Figure 3 that the working diaphragm 4 separates the working chamber 7 from the crankcase 28 and is rigidly connected to the tappet 45, and the tappet 45 which is preferably not deformable can be sprinkled by the elastically deformable material of the diaphragm 4. of work. As a result, the portion 50 that is difficult to deform develops in the vicinity of the tappet 45 in the center of the working diaphragm 4, whose portion in an outward direction passes over an easily deformable portion 44 of the working diaphragm 4, with the the latter mentioned in turn passing in an outward direction in the diaphragm bead 51 which is rigidly and hermetically connected to the pump housing 5. The tappet 45 in this mode is rigidly connected to the connecting rod 10 by means of a screw coupling. However, according to another embodiment, the tappet 45 can be integral with the connecting rod 10. If the tappet 45 and the connecting rod 10 are provided as separate component parts, they are welded or screwed together depending on the material of the component parts. The connecting rods 10 are mounted movably on the eccentrics 9 by means of ball bearings 46. In order to maintain a very low residual volume in the working chamber 7, the cover 6 of the working chamber has three three-dimensional shapes which adapt to the envelope of the surface 52 of the diaphragm near the working chamber which is induced by the movement of tilt of the tappet 45 that the articulated mechanism 8 moves. Preferably, the three-dimensional interior contour of the cover of the working chamber is adapted to the casing by maintaining a predefined small distance between the areas of the difficultly deformable portion 50 of the working diaphragm 4 and the cover 6 of the working chamber, while chooses that the distance in the areas of the easily deformable portion 44 of the working diaphragm 4 and the heel 51 from diaphragm to cover 6 of the working chamber is zero. The small distance between the cover of the working chamber within the contour and the envelope of the surface 52 of the diaphragm near the working chamber in the central area of the working diaphragm 4 prevents splicing thereof in the cover 6 of the working chamber during the operation of the pump 2 and allows an air flow between the chamber 7 of work and the channel 27 in the cover 6 of the working chamber also in the upper dead center of the articulated mechanism 8.

In addition, means are provided for adjusting the distance of the cover 6 of the working chamber from the working diaphragm 4, by which manufacturing tolerances or assembly tolerances are compensated. This is provided to carry out the adjustment during the final assembly of the motor and pump assembly 1. In one embodiment, the space adjusting means is formed of an adjustable connection between the connecting rod 10 and the tappet 45. An example of such connection is a welded joint. Another example involves a screw coupling with recessed washers. In another embodiment, the space adjustment means represent an adjustable connection between the pump housing 5 and the work chamber cover 6. An example for such an adjustable connection is a welded joint, another example is a screw coupling between the pump housing 5 and the cover 6 of the working chamber where the tension moment of the connecting screws is used to determine the deformation of the compression of the diaphragm edge that is designed as a diaphragm heel 51 for this purpose. An assembly 1 of optimized weight is obtained insofar as the pump housing 5 and the cover 6 of the working chamber are made of plastic, for example, by injection molding, and the parts of the component are preferably interconnected by a ultrasonic welding. In addition, the pump housing 5 and the cover 6 of the working chamber or only the pump housing 5 can be made of aluminum because the aluminum allows a good thermal dissipation of the motor 3. In this way, the combination is possible of plastic and aluminum material for the two component parts the pump housing 5 and the cover 6 of the working chamber. Favorably, the inlet and outlet channels 11, 13 are placed in the pump housing 5 in such a way that the two covers 6 of the working chamber can be designed identically. In this context, the covers 66 of the working chamber and the pump housing 5 include means for the defined positioning of the covers 6 of the working chamber in the pump housing 5 to facilitate the assembly and to avoid a failure in the positioning . To represent the means for a more precise defined placement, a non-symmetric joint contour is provided as well as projections on the connection surface. A non-symmetrical perforated pattern is suitable as a positioning means when coupling the cover 6 of the working chamber and the pump housing 5 with screws. The flow channels extending through the connecting surface between the cover 6 of the working chamber and the pump housing 5 are designed in the transitions between the cover 6 of the working chamber and the pump housing 5 to be gas-tight to its surroundings, for example, by the use of sealing elements 47 by means of a gas-tight solder joint. The above-described air outlet unit 29, which basically consists of a filter housing 30, a filter 31, a valve cover 32, a valve closure cover 33 and a valve member 34, is designed as an assembled unit above and intended for installation in the opening 48 of a wall 53 of the pump housing 5 that is remote from a motor 3. As can be seen, the splice of for example, the member 34 of the disk-shaped valve in the valve cover 32 is achieved by means of a valve closure cap 33. In this context, the opening 48 prior to the installation of the air outlet unit 28 performs the function of a mounting window that allows access to the interior space 28 of the pump housing 5. The exit channels 13 open inside the internal space 28 of the pump housing 5 so that the latter cited is used as an acoustic absorbent space to decrease the output sound when the air escapes from the working chambers 7. The assembly 1 of the motor and pump according to the invention is assembled with the following working steps: 1. Pre-assemble the sub-assembly motor 3, the units 21 of the working chamber cover and the air output unit 29; 2. Preassemble the eccentric shaft 43 with the double eccentric 9, composed of the two eccentrics 9 displaced by 180 degrees and bearing ball bearings 46, the connecting rod 10 of the motor end connection and a first working diaphragm 4 associated with the rod 10 of extreme connection of the motor; 3. Connect the subassembly with the motor 3 produced in step 2 when connecting the eccentric shaft 43 to the motor shaft 39, this working step takes place inside the pump housing 5. The openings of the pump housing 5 provided for the adaptation of the air outlet unit 29 and the second working diaphragm 4 are used as mounting windows for this purpose; 4. Connect the second connecting rod 10 to the second working diaphragm 4; 5. Insert the subassembly produced in step 4 into the pump housing 5; 6. Mount the second connecting rod 10 on the ball bearing 46 of the cam 9 near the air outlet; 7. Connect the motor 3 to the pump housing 5; 8 Connect the units 21 of the cover of the working chamber to the pump housing 5; 9. Close the opening 48 by means of an air outlet unit 29. Figures 4 to 6 show a second embodiment of an assembly 101 of the engine and pump. The design and function are largely identical with the first embodiment so that parts of similar components or parts of components with similar functions exhibit similar reference numbers increased by 100. Figure 4 is a three-dimensional view of the second embodiment of the assembly 101 of the motor and pump of the invention, comprising a pump 102 with a pump housing 105 and an electric motor 103 driving the pump 102, and the motor 103 for example, can be designed as a direct current motor . As apparent in Figure 5 in particular, which shows the assembly 101 of the motor and pump in a longitudinal cross section taken through a first plane, the pump 102 is provided as a double diaphragm pump with two opposing working diaphragms 104. , which are compressed in each case between the pump housing 105 and the cover 106 of the working chamber and for that reason delimits the working chamber 107. The working diaphragms 104 are movable in opposite directions by means of an articulated mechanism 108 comprising an eccentric 109 and a connecting rod 110 by the working diaphragm 104. Figure 6 is a cross-sectional view of the cover 106 of the working chamber of the assembly 101 of the engine and pump. It is clear that the cover 106 of the working chamber includes an upper lid 155 and a lower lid 156 which, depending on the material, i.e. plastic or aluminum, are welded or screwed together in a hermetic manner. The upper cover 155 is centered on the lower cover 156 for example by means of the welding addition 165, which engages a corresponding contour 166 when the upper cover 155 is mounted. In the pump housing 105 there is provided a port 125 shown in Figure 4 with an adapter 157 that fits in a seal manner therein and through which a connected brake booster is dislodged. For example, the adapter 157 may have an angular design as shown. However, in order to comply with customer requests, a rector adapter 157 is also possible. In addition, the design of an adapter output 158 to which a vacuum manner (not shown) is attached is different depending on the type of connection. In this way, a quick closure or a locking type closure is possible apart from the illustrated pine tree profile. The adapter 157 can be placed in the port 125 by means of a locking coupling, or the connection of the port adapter is provided to be rotatable. The rotary embodiment of the connection may be, for example, means of pin-shaped elements 159 which are protected in the perforations of the port 125 and which engage in an outer notch of the adapter 147 that is not visible. The port 125 opens into a housing bore, not illustrated, which branches into two channels provided in the pump housing 105 and which is directed to the two covers 106 of the working chamber. In this way it is possible to provide the covers 106 of the working chamber with an equal design for both sides of the pump 102, which simplifies the assembly considerably. Favorably, a second port 125 may be provided on the opposite side of the pump housing 105. In this way it is possible to connect the adapter 157 on one side or on the opposite side, depending on the request of the customer and the installation conditions of the assembly 101 of the motor and pump. For this purpose, one of the ports 125 can be closed hermetically by means of a spark plug. It is also feasible for one of the ports 125 to remain closed during manufacture and only to be opened by means of drilling, for example, if necessary. An inlet channel 111 provided in the upper cover 155 exists in each of the covers 106 of the working chamber, said channel is hermetically connected to the channel of the aforementioned pump housing by means of a sealing element and transports the sucked air to the inlet valve 112. The inlet valve 112 is preferably designed as a plate valve with a valve disk 117 made of elastic material. The total cross-sectional area of the hole to be covered by the elastomeric valve disc 117 is divided expediently into several small cross-sectional areas of the hole with a circular cross-section in each case. For this purpose, the entrance channel 111 in the top cover 155 branches into a corresponding number of unique channels 160 which are disposed circularly around a central line of the inlet valve 111. After passing through the inlet valve 112, the sucked air propagates through the openings 161 of the working chamber cover in the lower lid 156 in the working chamber 107 between the diaphragm 104 and the cover 106. of the working chamber, where it is compressed and directed through the openings 162 of the cover of the additional working chamber to the outlet valve 114, which is also designed as a plate valve with a valve disc 118 made of elastomeric material. As can be seen, an outlet channel 113 is designed between the upper lid 155 and the lower lid 156.

In order to maintain the working chamber 107 with a very low residual volume, the cover 106 of the working chamber in this embodiment also has a three-dimensional shape which adapts to the envelope of the surface 152 of the diaphragm near the working chamber which it is induced by a tilting ment of the tappet 145 that the articulated mechanism 108 s. Preferably, the three-dimensional internal contour of the cover of the working chamber is adapted to the casing by maintaining a predefined small distance between the areas of the deformable portion 150 of the working diaphragm 104 and the cover 106 of the working chamber, while chooses that the distance in the areas of an easily deformable portion 144 of the working diaphragm 104 and the diaphragm bead 151 will be zero. The small distance between the cover of the working chamber within the contour and the envelope of the surface 152 of the diaphragm near the working chamber in the central area of the working diaphragm 104 prevents splicing thereof in the working chamber 106. during the operation of the pump 102 and allows a flow of air between the working chamber 107 and the openings 161, 162 of the cover of the working chamber also at the upper dead center of the articulated mechanism 108. The openings 161, 162 of the cover of the working chamber belong to the alleged harmful volume, that is to say the residual volume remaining in the exhaust action. The air under the atmospheric pressure that remains in it expands in the process of aspiration, by which less volume can be vacuumed. Accordingly, it is suitable to provide the openings 161 and 162 of the cover of the working chamber with the least possible volume. Therefore, the inlet and outlet valves 112, 114 are arranged tangentially related to the inner contour of the work chamber cover, for example crosswise to the planes of symmetry of the pump 102, and openings 161. , 162 of the cover of the working chamber are configured as short perforations. This design of the covers 106 of the working chamber needs a small mounting space which is considered as another advantage. The escaping air is conducted from the outlet valve 114 through the outlet channel 113 in the cover 106 of the working chamber to an outlet channel (not shown) in the pump housing 105. The outlet channels 113 in the cover 106 of the working chamber and the pump housing 105 are hermetically interconnected by means of a sealing element. The two outlet channels in the pump housing 105 open in an internal space 128 of the pump housing 105, the so-called crankcase.

To facilitate the mounting of the valve discs 117, 118, the lower cap 156 includes a positioning pin 163, 164 in the area of the valves 112, 114, where the pin is used to guide the valve discs 117, 118 . The inlet valve 112 further includes two coaxial circular sealing surfaces 167, 168 provided in the upper cover 155, which are designed as circumferential projections, with a sealing surface 167 that is disposed towards the outside of the single channels 160 and a surface 168 sealing that is disposed within the unique channels 160. The reduction of the sealing surface achieves a greater sealing effect, and prevents the valve disc 117 from sticking to the upper cover 155, especially at low temperatures. An air outlet unit 129 provided in the pump housing 105 allows low noise air to escape out of the interior space 128. The interior space 128, also referred to as a crankcase, is therefore used as a sound absorbing space. As already written with respect to the first embodiment, the air outlet unit 129 has a non-return valve 149 comprising a one-part or multiple-part valve member 134, which prevents the return flow of the air and ejected as well as the entry of fluid or gaseous substances into the crankcase 128.

In addition, the air sound decreases in the air outlet out of the internal space 128 to the extent that the air outlet unit 129 includes a filter 131 disposed in a filter housing 130, through which the air exits into the atmosphere . In addition, the air outlet unit 129 comprises an air outlet cover 132, an air outlet closure cap 133 as well as a valve member 134 and may be provided as a preassembled subassembly. The air outlet cover 132, the cover 133 of the air outlet closure and the filter housing 130 are respectively joined by means of screw elements 135, 137. As can be seen, the filter housing 130 is riveted to the air outlet cover 132. Additional means for attenuating noise can be provided, which are favorably integrated into the air outlet unit 129 of the subassembly. When the air pressure in the internal space 128 of the pump becomes higher than the atmospheric pressure encompassed by the pump, the non-return valve 149 will open to the extent that the valve member 134 rises at least partially from the through holes 138 in the air outlet cover 132, and the air can escape from the pump housing 105 in the atmosphere through the openings not illustrated in the air outlet closure cap 133 and through the filter 131. On the other hand, in this way, the pressure in the internal space 128 of the pump 102 can increase in excess of the pressure of the atmosphere by the low differential pressure value that is required to open the valve 149 without return and, on the other hand , the pressure in the interior space 128 undergoes periodic fluctuations in the cycle of change in the volume of the internal space that accompanies the movement of the crankshaft. The result is the pressure of the internal space temporarily averaged under atmospheric pressure. In addition, it can be seen in Figure 5 that a motor shaft 139 of the electric motor 103 is mounted in a first bearing not shown in the motor 3 and in a second bearing 140, with the second bearing 140 being arranged partly in an engine housing 141 and partly in the pump housing 105. This achieves a favorable center of the motor 103 and the pump 102. The motor 103 is adjusted in the pump housing 105 by means of screw elements (not shown) which engage in threaded seats in the pump housing 105 when the housing 105 The pump is made of plastic. The motor shaft 139 in this mode additionally functions as an eccentric shaft 143 which carries the mechanism 108 articulated with the eccentrics 109 and the connecting rods 110. However, a separate design of a motor shaft 139 and an eccentric shaft 143 is also possible as described according to the first embodiment. To ensure the proper functioning of the motor and pump assembly 101, the center points of the cam 109 in relation to a center line of the motor shaft 139 are diametrically disposed at an equal distance, ie, the eccentrics 109 are moved by 180 °. . As a result, the reaction forces of the oscillating masses of the working diaphragms 104, of the connecting rods 110 and eccentrics 109 can almost be balanced because the common point of gravity remains at rest, at least in approximation, at each phase of your movement. The remaining negligible offset of an ideal mass balance is due to the fact that the two eccentrics 109, as shown in Figure 5, are arranged to be axially balanced, while the working diaphragms 104 move at the same axial level. For example, the eccentrics 109 can also be moved by 90 ° with each other, with the displacement by 90 ° producing a lower torque and, thus, having positive effects on the development of the noise as well as on the start of the operation of the pump 102. It can be seen in Figure 5 that the working diaphragm 104 separates the working chamber 107 from the crankcase 128 and is rigidly connected to the tappet 145, and the tappet 145 which is preferably not deformable can be sprinkled by the elastically deformable material of the working diaphragm 104. As a result, the above-mentioned hard deformable portion 150 in the center of the working diaphragm 104 develops in the vicinity of the tappet 145, whose portion in an outward direction passes over an easily deformable portion 144 of the working diaphragm 104, with the The latter mentioned in turn passing in an outward direction in the diaphragm bead 151 which is rigidly and hermetically connected to the pump housing 105. The tappet 145 can be rigidly connected to the connecting rod 110 by means of a joint welded to a screw coupling. However, said tappet can also be integral with the connecting rod 110. The connecting rods 110 are movably mounted on the eccentrics 109 by means of the ball bearing 146. When the connecting rods 110 are made of plastic, the support rings 169 injection molded in the area of a connecting rod eye 171 can stabilize the seat of the ball bearings 146 in the connecting rods 110. Alternatively, the slots 170 formed in the connecting rods 110 in the eyelet area 171 of the connecting rod can elastically enclose the ball bearings 146, as taken from Figure 7 showing another embodiment of a connecting rod 110. Furthermore, in this embodiment, means are provided for adjusting the distance of the cover 106 of the working chamber of the working diaphragm 104, whereby the manufacturing tolerances of the assembly tolerances are compensated. Adjustment is made to carry out the final assembly of the motor and pump assembly 101. In one embodiment, the space adjusting means is formed of an adjustable connection between the connecting rod 110 and the tappet 145. An example of such a connection is a welded joint. Another example involves a screw coupling with recessed washers. Another embodiment is also provided in this example for the adjustment of the space and means to be an adjustable connection between the pump housing 105 and the working chamber 106. An example for such an adjustable connection is a welded joint, another example is a screw coupling between the pump housing 105 and the cover 106 of the working chamber, where the tension moment of the connecting screws is used to determine the deformation of compression of the diaphragm edge that is designed as a diaphragm heel 151 for this purpose. An assembly 101 of optimized weight is obtained insofar as the pump housing 105 and the cover 106 of the working chamber are made of plastic, for example, by injection molding, and the single injection molded component parts are they interconnect preferably by ultrasonic welding. In addition, the pump housing 105 and the cover 106 of the working chamber or only the pump housing 105 can be made of aluminum because the aluminum allows a good thermal dissipation of the motor 103. In this way, a combination is possible of plastic and aluminum material for the two component parts. Favorably, the input and output channels 111, 113 are placed in the pump housing 105 in such a way that the two covers 106 of the working chamber can be designed identically. In this context, the covers 106 of the working chamber and the pump housing 105 include means for the defined positioning of the covers 106 of the working chamber in the pump housing 105 to facilitate the assembly and to avoid a failure in the positioning . To represent the means for a more precise defined placement, a non-symmetric joint contour is provided as well as projections on the connection surface. A non-symmetrical perforated pattern is suitable as a positioning means when coupling the cover 106 of the working chamber and the pump housing 105 with screws. The flow channels extending through the connecting surface between the cover 106 of the working chamber and the pump housing 105 are designed in the transitions between the working chamber cover 106 and the pump housing 105 to be gas tight to its surroundings, for example, by the use of sealing elements 147 by means of a gas-tight welding operation. The above-described air outlet unit 129, which basically consists of a filter housing 130, a filter 131, a valve cover 132, a valve closure cover 133 and a valve member 134, is designed as an assembled unit above and intended for installation in the opening 148 of a wall 153 of the pump housing 105 that is remote from an engine 103. As can be seen, the splice of for example, the valve member 134 in the form of a disk in the cover 132 of valve is achieved by means of a valve closing cap 33. In this context, the opening 148 prior to the installation of the air outlet unit 129 performs the function of a mounting window that allows access to the interior space 128 of the pump housing 105. The exit channels 113 open within the internal space 128 of the pump housing 105 so that the latter cited is used as an acoustic absorbent space to decrease the output sound when air escapes from the working chambers 107.

The assembly 1 of the motor and pump according to the invention is assembled with the following work steps: 1. Preassemble the sub-assembly motor 103, and the air output unit 129; 2. Install the motor 103 in the pump housing 105; 3. Assemble the double eccentrics 109, formed of two eccentrics 109 that move by 180 ° relative to one another and carry the ball bearings 146, in the connecting rod 110 of the motor end connection and a first working diaphragm associated with the connecting rod 110 of extreme motor connection, with this working step that is carried out inside the pump housing 105. The openings of the pump housing 105 provided for adaptation of the air outlet unit 129 of the second working diaphragm 105 are used as mounting windows for this purpose; 4. Connect the second connecting rod 110 to the second working diaphragm 104; 5. Insert the subassembly produced in step 4 into the pump housing 105; 6. Mounting the second connecting rod 110 on the ball bearing 146 of the cam 109 near the air outlet; 7. Attach the motor 103 to the pump housing 105; 8. Close the opening 148 by means of an air outlet unit 129. The motor and pump assemblies 1, 101 which have been described in the embodiments are activated by an electronic control unit (ECU) (not shown) depending on a signal from a sensor, which detects a difference in pressure between the chamber vacuum and the working chamber or the absolute pressure in the vacuum chamber of the brake booster. In this context, the motor and pump assembly 101 is turned on when the signal falls under a first defined lower value and turns off when the signal exceeds a second defined upper value. The control unit can be integrated into an electronic control unit ECU, for example that of the brake system, or it can be provided as a separate control unit. To protect the evacuation of the vacuum chamber from the brake booster that is required to achieve a brake reinforcement even without the parts of the activation unit such as the electronic control unit fail, provisions are made to execute the activation in such a manner that the motor and pump assembly 1, 101 is completely energized when the vehicle is activated ('turns on') and the electronic control unit is inactive. The assemblies 1, 101 of the motor and pump of the invention are used especially in motor vehicles with the vacuum brake booster and are a substitute for the previously conventional vacuum supply by means of a volumetric displacement of a vacuum pump driven by a vacuum pump. Internal combustion engine. This change in technology is based on the following facts: • Modern internal combustion engines can provide little or no displaced volume because the construction engineers of the internal combustion engines are aimed at reducing the losses of the regulator and, for consequently, the vacuum level decreases and because the secondary air introduced through the vacuum port in the induction tract disturbs the control of the exhaust gas of the internal combustion engine. • Internal combustion engines with direct injection that expand more widely in use do not produce a vacuum due to their principle and therefore are equipped with vacuum pumps in the prior art that are driven directly by an internal combustion engine, with These vacuum pumps are connected in most cases to a camshaft. • A vacuum pump that the internal combustion engine drives directly causes a permanent loss in power while the internal combustion engine is running, even when the vacuum has already reached the required level. It is more favorable under energetic aspects to drive a vacuum pump electrically and turn it off when the desired vacuum level is reached. • Operate conditions developed in hybrid vehicles equipped with an electric motor and an internal combustion engine in which the internal combustion engine is inactive and does not supply vacuum for a brake booster, therefore, a motor and pump assembly 1 is required. • In pure electric vehicles, electric power is available as the only source of energy to produce vacuum. The assemblies 1, 101 of the motor and pump of the invention described above are not restricted to the described case of the application of the vacuum supply. The assemblies 1, 101 of this type can be used in all cases where the objective is to bring gases with high efficiency and low noise emission from a first pressure level to a second higher pressure level. For example, the use of assembly 1, 101 of the invention as a compressor is also feasible. Preferably, the direction of the installation of the valves is reversed in this application so that the aspiration of the air out of the internal space 28, 128 of the pump housing 5, 105 and the discharge of the compressed air is carried out by means of a port 25, 125.

List of reference numbers 1 motor and pump assembly 2 pump 3 motor 4 working diaphragm 5 pump housing 6 work chamber cover 7 work chamber 8 articulated mechanism 9 eccentric 10 connecting rod 11 input channel 12 valve input 13 output channel 14 outlet valve 15 valve adaptation 16 valve adaptation 17 valve disk 18 valve disk 19 recess 20 valve unit 21 work chamber cover unit 22 screw coupling 23 hinge valve 24 screw element 25 port 26 inlet channel 27 channel 28 internal space 29 air outlet unit 30 filter housing 31 filter 32 air outlet cover 33 air outlet closing cover 34 valve member 35 screw element 36 screw element 37 screw element 38 through hole 39 motor shaft 40 bearing 41 motor housing 42 end of the motor shaft 43 eccentric shaft 44 portion 45 tappet 46 ball bearing 47 sealing element 48 opening 49 non-return valve 50 portion 51 diaphragm bead 52 diaphragm surface 53 wall 54 channel 101 engine and pump assembly 102 pump 103 motor 104 work diaphragm 105 pump housing 106 work chamber cover 107 working chamber 108 articulated mechanism 109 eccentric 110 connecting rod 111 inlet channel 112 inlet valve 113 outlet channel 114 outlet valve 117 valve disc 118 valve disc 125 louver 128 internal chamber 129 air outlet unit 130 filter housing 131 filter 132 air outlet cover 133 air outlet closing cover 134 valve member 135 screw element 137 screw element 138 through hole 139 motor shaft 140 bearing 141 engine housing 142 end of the motor shaft 143 eccentric shaft 144 portion 145 tappet 146 ball bearing 147 sealing element 148 opening 149 non-return valve 150 portion 151 diaphragm bead 152 diaphragm surface 153 wall 155 top cover 156 bottom cover 157 adapter 158 adapter outlet 159 element 160 single channel 161 work chamber cover opening 162 work chamber cover opening 163 pin positioned 164 pin placed 165 solder addition 166 contour 167 sealing surface 168 sealing surface 169 support ring 170 slot 171 connecting rod eyelet A central line E central line center line

Claims (43)

1. CLAIMS 1. The motor and pump assembly (1, 101), in particular, provide pressure for a brake activation device of a motor vehicle brake system with a pneumatic brake booster, in particular a vacuum brake booster, comprising a pump (2, 102) and an electric motor (3, 103) that drives the pump (2, 102), with the pump (2, 102) which is designed as a double diaphragm pump with two diaphragms (4, 102). , 104) of opposite work which is compressed in each case between the pump housing (5, 105) and the cover (6, 106) of the working chamber and by means of which it delimits a chamber (7, 107) of work and is movable by means of an articulated mechanism (8,108) including eccentrics (9, 109) and connecting rods (10, 110), wherein an inlet channel (11, 111) with a valve (12, 112) inlet and an outlet channel (13, 113) with an outlet valve (14, 114) is associated with each working chamber (7, 107), characterized in that the exit channels (13, 113) are arranged in the covers (6, 106) of the working chamber and in the pump housing (5, 105), in such a way that the air displaced from the chambers (7, 107) of work is routed to an internal space (28, 128) of the pump housing (5, 105), and in which an air outlet unit (29, 129) is provided which allows the escape of air from the space (28). , 128) internal in a low noise.
2. 2. The motor and pump assembly as claimed in claim 1, characterized in that the air outlet unit (29, 129) includes means for absorbing the sound.
3. 3. The motor and pump assembly as claimed in claim 2, characterized in that the air outlet unit (29, 129) closes an opening (48, 148) of a wall (53, 153) of the housing (5, 105) of pump in sealed form. .
4. The motor and pump assembly as claimed in claim 3, characterized in that the air outlet unit (29) comprises a filter housing (30), a filter (31), an air outlet cover (32), an air outlet closure cap (33) as well as a valve member (34) and is provided as a subassembly that can be preassembled.
5. The motor and pump assembly as claimed in claim 4, characterized in that the air outlet cover (32), the air outlet closure cap (33) and the valve member (34) form a valve (49) no return.
6. The motor and pump assembly as claimed in claim 4, characterized in that the filter housing (130), the air outlet closure cap (133) and the valve member (134) form a valve (149). ) no return . .
7. The motor and pump assembly as claimed in claim 5, characterized in that the filter housing (130) is riveted to an air outlet cover (132).
8. 8. The motor and pump assembly as claimed in any of claims 4 to 7, characterized in that the air outlet cover (32, 132) can be adjusted to the wall (53, 153) by means of elements (35, 135) of screw.
9. 9. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the input channels (11, 111) are interconnected through the channels (54, -) designed in the housing (5, 105) of pump and have a common port (25, 125).
10. 10. The motor and pump assembly as claimed in claim 9, characterized in that the port (25) includes means for adjusting a hose.
11. 11. The motor and pump assembly as claimed in claim 10, characterized in that the port (25) is designed as an air intake fitting.
12. The motor and pump assembly as claimed in claim 9, characterized in that an adapter (157) is provided that fits in a sealing manner in the port (125) and includes an outlet (158) of the adapter, with the outlet (158) of the adapter including means for attaching a hose.
13. 13. The motor and pump assembly as claimed in claim 12, characterized in that the adapter (157) can be placed in the port (125) by means of a closing coupling.
14. 14. The motor and pump assembly as claimed in claim 13, characterized in that the adapter (157) is arranged in the port (125) to be rotatable by means of bolt-like elements (159), said elements (159) in the form of a bolt are coupled to the outer notch of the adapter (157).
15. 15. The motor and pump assembly as claimed in any of claims 9 to 14, characterized in that the pump housing (105) includes two opposing ports (125), and a port (125) is closed.
16. 16. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the housing (5, 105) of the pump is made of plastic or aluminum.
17. 17. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the cover (6, 106) of the working chamber is made of plastic or aluminum.
18. 18. The motor and pump assembly as claimed in any of the preceding claims, characterized in the inlet valve (12) and the outlet valve (14) of a working chamber (7) are provided in each case as a valve unit (20) that can be preassembled.
19. 19. The motor and pump assembly as claimed in claim 18, characterized in that the valve unit (20) that can be preassembled can be integrated in each case in the cover (6) of the working chamber and together with this form a unit (21) of the work chamber cover ready to be installed.
20. 20. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the cover (106) of the working chamber includes an upper cover (155) and a lower cover (156) which are interconnected in a way of sealing, with the valves (112, 114) being provided between the upper cover (155) and the lower cover (156).
21. 21. The motor and pump assembly as claimed in claim 20, characterized in that the upper cover (155) is welded or screwed to the lower cover (156). 2 .
22. The motor and pump assembly as claimed in claim 21, characterized in that the inlet channel (111) is designed in the upper cover (155) and the outlet channel (113) is provided between the upper cover (155) and the lower lid (156).
23. 23. The motor and pump assembly as claimed in claim 22, characterized in that the inlet channel (111) in the area of the inlet valve (112) is divided into several unique channels (160) that are disposed circularly around of a center line of the inlet valve (112).
24. 24. The motor and pump assembly as claimed in claim 22 or 23, characterized in that the inlet valve (112) and outlet valve (114) are arranged crosswise in the pump's symmetry axes (102). ).
25. 25. The motor and pump assembly as claimed in claim 24, characterized in that the valves (112, 114) are provided as plate valves with a valve disc (117, 118).
26. 26. The motor and pump assembly as claimed in claim 25, characterized in that the bolts (163, 164) positioned are provided in the lower cover (156) for positioning the valve discs (117, 118).
27. 27. The motor and pump assembly as claimed in claim 26, characterized in that the lower cover (156) includes openings (161, 162) of the cover of the working chamber that are assigned to the inlet valve and valve. outlet (112, 114), and the openings (161, 162) of the cover of the working chamber are arranged in a circular mode around the center line of the valves (112, 114).
28. 28. The motor and pump assembly as claimed in any of the preceding claims 19 to 27, characterized in that the channels (11), 111, 13, 113) are arranged in the pump housing (5, 105) in such a way that the two covers (6,106) of the working chamber have an identical design.
29. 29. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the space adjustment means is provided to adjust the distance between the covers (6, 106) of the working chamber and the diaphragm (4). , 104) of work.
30. 30. The motor and pump assembly as claimed in claim 29, characterized in that the space adjustment means are provided by an adjustable connection between the connecting rod (10, 110) and a tappet (45, 145) attached to the working diaphragm (4, 104).
31. 31. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the space adjusting means is provided to adjust the distance between the covers (6, 106) of the working chamber and the housing (5). , 105) of pump.
32. 32. The motor and pump assembly as claimed in claim 31, characterized in that the distance is adjusted by means of a welded joint.
33. 33. The motor and pump assembly as claimed in claim 31, characterized in that the distance is adjusted by means of a screw coupling between the cover (6, 106) of the working chamber and the housing (5, 105). of pump.
34. 34. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the shaft (39, 139) of an electric motor (3, 103) is mounted in a first bearing arranged in the motor (3, 103). ) and in a second bearing (40, 140), with the second bearing (40, 140) which is partly adapted in a motor housing (41, 141) partly in the pump housing (5, 105), and wherein the end (42, 142) of the motor shaft projects into the pump housing (5, 105).
35. 35. The motor and pump assembly as claimed in claim 34, characterized in that the articulated mechanism (108) (eccentric (109) and the connecting rods (110)) are arranged in the shaft (139) of the motor.
36. 36. The motor and pump assembly as claimed in claim 34, characterized in that the articulated mechanism (8) (eccentric (9) and the connecting rods (10)) are arranged in an eccentric shaft (43), which is they connect to the shaft (39) of the motor by means of a screw coupling, with central lines (M, E) of the shaft (39) of the motor and the eccentric shaft (43) being in alignment with each other.
37. 37. The motor and pump assembly as claimed in claim 35 or 36, characterized in that the center points of the eccentrics (9, 109) are arranged diametrically in relation to a central line (M, E) of the shaft (39, 139) of the eccentric shaft motor (43, 143), respectively.
38. 38. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the eccentrics (9) are designed in one piece as a double eccentric.
39. 39. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the housing (5, 105) of the pump and the covers (6, 106) of the working chamber include means for positioning defined in the covers (6, 106) of the working chamber in the housing (5, 105) of the pump.
40. 40. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the motor and pump assembly (1, 101) is activated by means of an electronic control unit depending on a signal from a sensor, which detects a difference in pressure between the vacuum chamber and the working chamber or an absolute pressure in the vacuum chamber of the brake booster.
41. 41. The motor and pump assembly as claimed in any of the preceding claims, characterized in that the connecting rods (110) in the area of a connecting rod eyelet (171) include injection molded support rings (169). to stabilize the ball bearings (146).
42. 42. The motor and pump assembly as claimed in any of the preceding claims 1 to 41, characterized in that the connecting rods (110) include a groove (170) in the area of the eye (171) of the connecting rod.
43. 43. The brake system of the motor vehicle characterized in that the brake system of the motor vehicle includes a motor and pump assembly (1, 101) as claimed in any of the preceding claims.