JP2024504458A - Brake force generator and operating device for operating devices of brake equipment - Google Patents

Abstract

The present invention provides a brake force generator (4) for an operating device (1) of a brake device, which drives a drive shaft (6) rotatably supported about a rotation axis (7). an electric motor (5), a transmission device (31) operatively connected to the drive shaft (6), an operation sensor, and a control unit (14) for controlling the electric motor (5) It relates to a type of thing that has the following. The control unit (14) is arranged axially at least generally between the electric motor (5) on one side and the transmission (31) on the other side; ) for electrically contacting the control unit (14); and a second plug-connecting device (24) for electrically contacting the operating sensor to the control unit (14). is located. [Selection diagram] Figure 1

Description

The present invention includes an electric motor configured to drive a drive shaft rotatably supported around a rotation axis, a transmission device operatively connected to the drive shaft, an operation sensor, and an electric motor for controlling the electric motor. The present invention relates to a brake force generator for an operating device of a brake device, having a control unit.

The invention also relates to an operating device equipped with a brake force generator of this type.

Hydraulic brake systems for motor vehicles usually have several friction brake systems. For actuating a friction brake system, an actuating device is usually provided with a master brake cylinder in which at least one hydraulic piston is displaceably mounted. The master brake cylinder is fluidically connected to the slave cylinder of the friction brake system in such a way that the friction brake system can be actuated by displacement of a hydraulic piston.

Frequently, an actuating device with a brake force generator is installed in the motor vehicle structure, which brake force generator has an electric motor and is designed for displacing a hydraulic piston by means of the electric motor. A brake force generator of this type is known, for example, from DE 10 2005 200 2010. In this case, the electric motor of the brake force generator is configured to drive a drive shaft which is rotatably mounted about the axis of rotation. The drive shaft is operatively connected to the transmission of the brake force generator. The transmission can be driven by an electric motor using a drive shaft. Furthermore, the brake force generator has an actuation sensor, ie a sensor designed for monitoring the actuation of the brake force generator. The brake force generator also has a control unit configured to control the electric motor. Basically, the control unit is configured to control the electric motor in dependence on sensor signals of the operating sensor. In the brake force generator disclosed in Patent Document 1, the control unit surrounds the electric motor in the radial direction in relation to the rotation axis of the drive shaft. Patent Document 2 discloses an electric motor type brake force generator in which the rotational axis of the drive shaft is aligned at right angles to the sliding axis of the hydraulic piston. According to Patent Document 3, a motorized brake force generator is known in which a sensor element of an actuation sensor is integrated in a control unit.

Federal Republic of Germany Patent Publication No. 102013016912 Federal Republic of Germany Patent Publication No. 102013006795 Federal Republic of Germany Patent Publication No. 102014220358

The brake force generator according to the invention with the features of claim 1 has the advantage that the assembly of the brake force generator is simplified in view of the electrical or signal technology connection of the control unit and the operating sensor. have. For this purpose, according to the invention, the control unit is arranged at least approximately in the axial direction between the electric motor on the one side and the transmission on the other side, and the control unit is arranged at least substantially in the axial direction between the electric motor and the transmission on the other side. A plug connection device and a second plug connection device are arranged for electrically contacting the operating sensor to the control unit. In this specification, when the concepts "axial" and "radial" are used, these concepts refer to the axis of rotation of the drive shaft, unless a different relationship is specified for these concepts. It is something. According to the invention, the control unit is arranged axially at least approximately between the electric motor on the one side and the transmission on the other side. This does not exclude that the control unit has a section that is located axially at the same level as the electric motor or at the same level as the transmission. Due to this arrangement of the control unit according to the invention, on the one hand, the control unit is located in a location that is easily accessible for the assembly engineer, and on the other hand, it is possible to connect the operating sensor to the second plug connection in a technically simple manner. Located in a place where you can connect. In a preferred form, the control unit has a section facing the electric motor in the axial direction. This section is located radially at the same level as the electric motor, so that the electric motor is axially spaced from the transmission by this section of the control unit. In a preferred form, the control unit has sections that are arranged radially offset relative to the electric motor. In a preferred manner, the first and second plug connection devices are arranged in this section of the control unit. A first plug connection device is provided for contacting the control unit. To that extent, the first plug-in connection device is electrically connected to the control unit and has at least one electrical connection, preferably a plurality of electrical connections, for contacting the control unit. There is. A second plug connection device is provided for contacting the operating sensor. To that extent, the second plug-in connection device is electrically connected to the operating sensor and has at least one electrical connection, preferably a plurality of electrical connections, for contacting the operating sensor. There is. In a preferred embodiment, the plug-in connection device is designed as a connector receptacle for receiving the connector device. Alternatively, the bayonet connection device is configured as a connector device configured to be inserted into a connector receptacle. Elements which can be connected to a plurality of plug-in connections by plugging them together in order to contact a control unit or an operating sensor are also referred to below as counter-plug connections. The first and second plug connection devices are arranged in the control unit according to the invention. In a preferred embodiment, the control unit has a control unit housing, in which the first and second plug connection devices are arranged on the control unit housing. In a preferred embodiment, the brake force generator has an actuating element which is movable along the axis of displacement of the hydraulic piston, such that the hydraulic piston is moved by the displacement of the actuating element. It is slidably connected to a hydraulic piston. In a preferred manner, the drive shaft is connected to the actuating member by means of a transmission, such that the actuating member can be moved by means of an electric motor. For example, the operating member is a threaded spindle, the outer transmission of which meshes with the inner transmission of the spindle nut of the transmission. In a preferred manner, the actuation sensor is configured for monitoring the sliding position of the actuating member and/or of the input rod which is/is connectable to the brake pedal. For example, the operating sensor has a measurement value transmitter connected to the input rod and a receiver connected to the operating member. The operating sensor is configured as a differential stroke sensor for detecting the differential axial stroke between the measured value transmitter and the receiver.

According to a preferred embodiment, the first and second bayonet connection devices are arranged at the same height in the axial direction. This allows a particularly simple connection of the control unit and the operating sensor during assembly of the brake force generator. In a preferred manner, the first and second bayonet connection devices are arranged radially adjacent to each other.

In a preferred manner, the first and second plug connection devices are arranged on the same housing wall of the control unit housing. This provides the advantage that only this housing wall needs to be kept accessible for connecting the control unit and the operating sensor. In a preferred manner, the first and second bayonet connection devices are arranged in the housing wall aligned at right angles to the axis of rotation of the drive shaft. Particularly preferably, the first and second plug connection devices are aligned perpendicularly to the axis of rotation of the drive shaft and are arranged on the housing wall facing away from the transmission.

According to a preferred embodiment, the second plug connection device is connected to the actuation sensor by at least one electrical line extending through the control unit housing. This provides, on the one hand, a technically simple connection of the actuating sensor to the second plug-in connection. This is particularly because it is not necessary to guide the wiring around the control unit housing. Furthermore, since the wiring extends through the control unit housing, the wiring is protected against mechanical influences by the control unit housing. In a preferred form, the housing wall of the control unit housing, aligned at right angles to the axis of rotation of the drive shaft and facing away from the electric motor, has an axial opening, and the electrical wiring is routed through this axial opening. penetrate into the control unit housing.

In a preferred form, the first and second plug-in connection devices have one common connector housing. A connector housing is to be understood as a component in which the electrical connection of the plug-in connection device is directly arranged or formed. The electrical connection of the first plug-in connection and the electrical connection of the second plug-in connection are arranged in the same component in this embodiment. As a result, the first and second plug-in connection devices can be operated in common in a simple manner. In a preferred form, the common connector housing is formed by the control unit housing. Alternatively, the common connector housing is constructed separately from the control unit housing and inserted into a cutout or opening in the control unit housing.

According to an alternative embodiment, the first bayonet connection device preferably has a first connector housing and the second bayonet connection device is configured separately from the first connector housing. and a second connector housing. In a preferred manner, the first connector housing is formed by the control unit housing. Alternatively, the first connector housing is formed by a connector housing which is preferably constructed separately from the control unit housing and is inserted into a cutout or opening in the control unit housing. The second connector housing is preferably constructed separately from the control unit housing and is inserted into a cutout or opening in the control unit housing.

According to a preferred embodiment, the transmission device is arranged in a main housing of the brake force generator, and the electric motor is arranged in a motor housing of the brake force generator, which is constructed separately from the main housing. The main housing and the motor housing are connected to each other by a housing flange. A housing flange is provided which is connected to the main housing on one side and to the control unit housing on the other side. This provides a solid connection between the main housing and the motor housing. Here, the housing flange is understood to be a plate-shaped housing part. In a preferred form, the housing flange is connected to the main housing by a screw connection. In a preferred form, the housing flange is aligned at right angles to the axis of rotation of the drive shaft.

In a preferred manner, the control unit is arranged axially at least approximately between the housing flange on one side and the motor housing on the other side. The housing flange is thus arranged axially between the control unit on one side and the transmission on the other side. This has the advantage that the housing flange is brought into direct contact with the main housing and that the housing flange is therefore particularly firmly fixed to the main housing. In a preferred embodiment, the control unit housing rests flush against the housing flange. In this case, the control unit housing is connected in a suitable manner to the housing flange. For example, the control unit housing is glued to the housing flange.

According to a preferred embodiment, the brake force generator has an elongate fastening member extending axially through the control unit, by means of which the motor housing is connected to the housing flange. . Despite the axial spacing of the motor housing from the housing flange, the fastening element provides a rigid fixation of the motor housing to the housing flange or to the main housing. In a preferred manner, the fastening element is connected to the motor housing by a press connection. In a preferred manner, the fastening element is connected to the housing flange by a press connection. Advantageously, a plurality of elongate fastening members are provided, which are radially spaced from one another and connected to the housing flange by the motor housing.

According to a preferred embodiment, the main housing has a radial projection axially facing the control unit, the radial projection having an axial opening through which the main housing has a radial projection. Electrical wiring is extended. The operation sensor is basically arranged within the main housing. Accordingly, electrical wiring needs to be guided through the main housing in order to contact the operating sensor. By guiding the electrical wiring into the main housing in the area of the radial projection, the wiring extends at most over a short distance outside the housing. Particularly preferably, the axial opening of the radial projection lies axially opposite an axial opening in the housing wall of the control unit housing, through which the wiring enters the control unit housing. It is supposed to be done.

In a preferred embodiment, the control unit has a printed circuit board with an axial opening into which the drive shaft engages axially through. Since the control unit is arranged between the electric motor on the one hand and the transmission on the other side, it is fundamentally difficult to couple the electric motor to the transmission. According to the above solution, a printed circuit board with an axial opening is provided, through which the drive shaft engages through in the axial direction, which is mechanically simple and at the same time saves installation space. guaranteed connectivity.

According to a preferred embodiment, the control unit is in thermally conductive contact with the housing flange for heat removal and/or the control unit is in thermally conductive contact with the main housing for heat removal. The housing flange and the main housing are essentially made of metal and have a high thermal conductivity. In a preferred form, the thermally conductive contact is provided by a contact connection between the control unit and the housing flange or between the control unit and the main housing. As a result, the advantage is that a separate cooling element for removing heat from the control unit can be dispensed with. This saves cost and installation space.

According to a preferred embodiment, the control unit is of angularly bent design. In that case, the control unit has a first leg and a second leg, which are arranged at an angle to each other. Such an arrangement of the control unit offers the advantage that radial offsets between the area where the electrical wiring projects from the main housing and the electric motor can be bridged in a suitable manner by the control unit. In a preferred form, the first leg of the control unit axially faces the electric motor and the second leg axially faces the radial projection of the main housing.

The actuating device for a brake system according to the invention has a master brake cylinder in which at least one hydraulic piston is displaceably mounted in the axial direction. The actuating device is characterized by a brake force generator according to the invention according to the features of claim 14, in which the hydraulic piston is axially movable by means of an electric motor. This results in the advantages mentioned above. Other preferred features and combinations of features are described in the description and in the claims.

FIG. 3 is a plan view of the operating device. FIG. 3 is a cross-sectional view of the operating device.

The present invention will be explained in detail below using the drawings.

FIG. 1 shows a top view of an operating device 1 for a hydraulic brake system of a motor vehicle. The operating device 1 has a master brake cylinder 2 . At least one hydraulic piston is mounted in the master brake cylinder 2 so as to be axially movable along a sliding axis 3 . Here, the master brake cylinder 2 is a tandem master cylinder 2. Correspondingly, two hydraulic pistons are mounted in the master brake cylinder 2 so that they can be axially displaced one behind the other. If the actuating device 1 is installed as part of a brake system in a motor vehicle, the master brake cylinder 2 can operate the friction brake system by means of a hydraulic piston displacement via a hydraulic connection (not shown). As such, the brake device is connected to the slave cylinder of the friction brake device.

The operating device 1 further includes an electric brake force generator 4 . The brake force generator 4 has an electric motor 5 which is arranged in a motor housing 11 . The electric motor 5 is configured to drive a drive shaft 6 rotatably supported about a rotation axis 7 . For this purpose, the rotor of the electric motor 5 is coupled to the drive shaft 6 in a relatively non-rotatable manner. Here, the sliding axis 3 and the rotation axis 7 extend parallel to each other.

The brake force generator 4 further includes a main housing 8 . Although the main housing 8 is composed of several parts, only the cover 9 of the main housing 8 is shown in FIG. The master brake cylinder 2 is connected to the cover 9 by operating means 10 .

The brake force generator 4 furthermore has an actuating element, not shown in FIG. 1, which is mounted so as to be slidable along the sliding axis 3. The operating member is connected to the hydraulic piston such that the hydraulic piston is slidable by sliding movement of the operating member.

Brake force generator 4 also has a transmission 31, which is not shown in FIG. By means of a transmission 31, the actuating member is connected to the drive shaft 6 in such a way that it can be axially displaced by rotation of the drive shaft 6. Therefore, the single hydraulic piston mounted in the master brake cylinder 2 or the hydraulic pistons mounted in the master brake cylinder 2 can be moved by the electric motor 5, so that the friction brake system of the brake system can be operated by an electric motor 5.

The motor housing 11 is connected by a housing flange 12 to a transmission housing 38 of the main housing 8, which is not shown in FIG. In this case, the housing flange 12 is connected to the transmission housing 38 by fastening means 13 . The fixing of the motor housing 11 to the housing flange 12 will be explained in more detail below with reference to FIG. Furthermore, the transmission housing 38 is connected to the cover 9 of the main housing 8 by means of fixing means (not shown).

Furthermore, the brake force generator 4 has a control unit 14 with a control unit housing 15 . Control unit 14 is configured here for controlling electric motor 5 . The control unit 14 is here of an angularly bent design. That is, the control unit 14 has a first leg 16 and a second leg 17, which are aligned at an angle to each other. In this case, the first leg 16 has a section 18 axially facing the electric motor 5 . The second leg 17 is arranged radially offset with respect to the electric motor 5.

A first plug connection 19 for contacting the control unit 14 is arranged in the area of the second leg 17 . The first plug connection device 19 has a first connector housing 20 . The first connector housing 20 is inserted into an axial opening 22 in a housing wall 23 of the control unit housing 15, which housing wall 23 is aligned at right angles to the sliding axis 3 and is arranged in a transmission 31. is on the opposite side. A plurality of electrical connections 21 for contacting the control unit 14 are arranged on the first connector housing 20 . Here, the first bayonet connection device 19 is a connector receptacle 19 configured to receive a connector device. Optionally, the first plug-in device 19 is designed as a connector device.

Furthermore, the brake force generator 4 has an actuation sensor, not shown in FIG. 1, which is arranged in the main housing 8. This operating sensor is configured to monitor the shift position of the operating member and/or the shift position of an input rod connected to a brake pedal of the braking device. For example, the actuating sensor is designed as a differential stroke sensor and has for this purpose a measured value transmitter connected to the input rod as well as a receiver connected to the actuating member. The control unit 14 is configured to control the electric motor 5 in dependence on the sensor signals of the operating sensors.

A second plug connection device 24 is provided in the area of the second leg 17 for contacting the operating sensor. The second plug connection device 24 has a second connector housing 25 . The second connector housing 25 is inserted into an axial opening 26 in the housing wall 23 of the control unit housing 15 . A plurality of electrical connections 27 are arranged on the second connector housing 25 for contacting the operating sensors. These electrical connections 27 are electrically connected to the operation sensor by electrical wiring. Here, the second bayonet connection device 24 is a connector receptacle 24 configured to receive a connector device. Alternatively, the second plug-in device 24 is designed as a connector device.

As can be seen in FIG. 1, the first plug-in connection 19 and the second plug-in connection 24 are arranged adjacent to each other in the control unit 14 . This reduces the need for connecting the plug connection devices 19, 24 to the corresponding counter plug connection devices when installing the operating device 1 in a motor vehicle.

The control unit housing 15 has a housing wall, which is not shown in FIG. This housing wall has an axial opening that is arranged axially in the same row as the axial opening 26 . The electrical wiring electrically connecting the connection 27 with the operating sensor projects from the control unit housing 15 through an axial opening in the housing wall opposite the motor 5 .

The cover 9 has a radial projection 29 which axially faces the control unit 14 in the area where the second plug connection 24 is arranged. The radial projection 29 has an axial opening that is arranged axially in the same row as the axial opening 26 . The electrical wiring electrically connecting the connection part 27 with the operating sensor penetrates through the axial opening of the radial projection 29 into the main housing 8 and extends from there to the operating sensor.

FIG. 2 is a cross-sectional view of the operating device 1 taken along the cut plane 30 shown in FIG. 1, viewed in the viewing direction A.

First, the form of the transmission device 31 shown in FIG. 2 will be explained in detail. The transmission device 31 has a spur gear 32 that is connected to the drive shaft 6 in a relatively rotationally fixed manner. Furthermore, the transmission 31 has a rotatably mounted double gear wheel 33 with a first toothing 34 and a second toothing 35 . The teeth of the spur gear 32 mesh with the first teeth 34 of the double gear 33 . Furthermore, the transmission 31 has a rotatably mounted spindle nut 36. The second tooth row 35 of the double gearwheel 33 meshes with the outer tooth row of the spindle nut 36 . The internal toothing (not shown) of the spindle nut 36 meshes with the external toothing of a threaded spindle 37, which is mounted so as to be slidable in the axial direction, so that the threaded spindle 37 is moved by rotation of the spindle nut 36. It can be slid in the axial direction. The axially movable actuating member is formed by the threaded spindle 37 or by a member movably connected together with the threaded spindle 37 . As further shown in FIG. 2, the transmission 31 is at least generally arranged within the transmission housing 38.

As further shown in FIG. 2, the control unit 14 is arranged axially between the electric motor 5 on one side and the transmission 31 on the other side. The electric motor 5 is thus arranged by the control unit 14 at a distance from the transmission 31 in the axial direction. Due to this arrangement of the control unit 14, the control unit 14 faces the main housing 8 in the axial direction. This reduces the connection of the operating sensor to the second plug-in connection device 24. The housing flange 12 is arranged axially between the control unit 14 on one side and the transmission housing 38 on the other side. In this case, the control unit 14 abuts against the housing flange 12 in a planar manner. Such a surface abutment provides heat removal of the control unit 14 by the metal transmission flange 12 in this area.

The control unit 14 has a printed circuit board 39 on which power electronics having a plurality of switching elements for controlling, for example, the phases of the electric motor 5 are arranged. The switching elements of the power electronics are electrically connected to the phases of the motor 5 by electrical wiring 40 . The printed circuit board 39 has an axial opening 41 . The drive shaft 6 is axially penetratingly engaged with the axial opening 41 .

A magnetic element 42 is provided for monitoring the rotation angle of the drive shaft 6, and is connected to the drive shaft 6 in a manner that cannot rotate relative to it. Also provided is a receiver, not shown in FIG. 2, which is configured to detect the magnetic field produced by the magnetic element 42. For this purpose, the receiver is located opposite the magnetic element 42, for example radially or axially.

For fixing the electric motor 5 to the housing flange 12, a plurality of longitudinal fixing members are provided, of which only one fixing member 43 is shown in FIG. The fixing member 43 extends through the control unit 14 in the axial direction. The fixing member 43 is connected to the motor housing 11 by a press connection. Furthermore, the fixing element 43 is connected to the housing flange 12 by a press connection. Here, the printed circuit board 39 has an axial opening, and the fixing member 43 extends through the axial opening. Alternatively, the fixing member 43 extends through an area of the control unit 14 where the printed circuit board 39 is not present. Here, the fixing member 43 is a sleeve-shaped fixing member 43.

1 Operating device 2 Master brake cylinder, tandem master cylinder 3 Sliding axis 4 Brake force generator 5 Electric motor 6 Drive shaft 7 Rotation axis 8 Main housing 9 Cover 11 Motor housing 12 Housing flange 13 Fixing means 14 Control unit 15 Control unit housing 16 First leg 17 Second leg 18 Section axially facing electric motor 5 19 First bayonet connection, connector receiver 20 First connector housing 22 Axial opening 23 Housing wall 24 Second bayonet connection , connector receiver 25 second connector housing 26 axial opening 27 electrical connection, connection 29 radial projection 30 cutting surface 31 transmission 32 spur gear 33 double gear 34 first tooth row 35 second tooth row 36 Spindle nut 37 Threaded spindle 38 Transmission housing 39 Printed circuit board 40 Electrical wiring 41 Axial opening 42 Magnetic element 43 Fixing member A View direction

Claims (14)

a brake force generator for an operating device of a brake system, an electric motor (5) configured to drive a drive shaft (6) rotatably supported about a rotational axis (7); A type having a transmission device (31) operatively connected to a drive shaft (6), an operation sensor, and a control unit (14) for controlling the electric motor (5),
The control unit (14) is arranged axially at least approximately between the electric motor (5) on one side and the transmission (31) on the other side, the control unit (14) being electrically connected to the control unit (14). A first plug-connection device (19) for contacting the control unit (14) and a second plug-connection device (24) for electrically contacting the operating sensor to the control unit (14) are arranged. A brake force generator for a brake device operating device, characterized in that: Brake force generator according to claim 1, characterized in that said first and said second bayonet connection device (19, 24) are arranged at the same height in the axial direction. The control unit (14) has a control unit housing (15), and the first and second plug-in connections (19, 24) are arranged in the same housing wall (23) of the control unit housing (15). Brake force generator according to claim 1 or 2, characterized in that it is arranged. From claim 1, characterized in that the second plug-in connection device (24) is connected to the operating sensor by at least one electrical line extending through the control unit housing (14). 3. The brake force generator according to any one of items 3 to 3. 5. Any one of claims 1 to 4, characterized in that the first bayonet connection (19) and the second bayonet connection (24) have a common connector housing. Brake force generator as described. The first bayonet connection (19) has a first connector housing (20), and the second bayonet connection (24) is separate from the first connector housing (20). Brake force generator according to one of the preceding claims, characterized in that it has a configured second connector housing (25). The transmission device (31) is arranged in a main housing (8), and the electric motor (5) is arranged in a motor housing (11) configured separately from the main housing (8). 7. Brake force generator according to claim 1, characterized in that the main housing (8) and the motor housing (11) are connected to each other by a housing flange (12). . Claim 7, characterized in that the control unit (14) is arranged axially at least approximately between the housing flange (12) on one side and the motor housing (11) on the other side. Brake force generator as described. At least one elongate fastening member (43) is provided extending axially through the control unit (14), the motor housing (11) being secured by the fastening member (43) to the housing flange ( Brake force generator according to claim 8, characterized in that it is connected to (12). The main housing (8) has a radial projection (29) facing the control unit (14) in the axial direction, the radial projection (29) having an axial opening, and the radial projection (29) having an axial opening. 10. Brake force generator according to claim 7, characterized in that an electrical wiring extends through the directional opening. The control unit (14) has a printed circuit board (39), the printed circuit board (39) has an axial opening (41) into which the drive shaft ( 11. Brake force generator according to claim 1, characterized in that 6) is in axially penetrating engagement. The control unit (14) is in thermally conductive contact with the housing flange (12) for heat removal, and/or the control unit (14) is in thermally conductive contact with the main housing (8) for heat removal. 12. Brake force generator according to claim 1, characterized in that the brake force generator is in contact. 13. Operating device according to claim 1, characterized in that the control unit (14) is constructed in an angularly bent manner. 13. Actuating device for a brake system, comprising a master brake cylinder (2) in which at least one hydraulic piston is displaceably supported in the axial direction; an actuating device for a brake system, comprising a brake force generator (4), the hydraulic piston being axially displaceable by the electric motor (5).

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