Brake force generator for an operating device for a brake system, and operating device for a brake system

Abstract

The present invention relates to a brake force generator (1) for an operating device (2) of a brake system, the brake force generator (1) having a slidably supported actuator element (13), an electric motor (15) designed to slide the actuator element (13), a control unit (22) for controlling the electric motor (15), an input rod (5) connectable or connected to a brake pedal and slidably supported, a stroke sensor (19) having a transmitter (20) and a receiver (21) and arranged corresponding to the input rod (5), and a communication circuit (24) electrically connected at one end to the receiver (21) and at the other end to the control unit (22). [Solution] The stroke sensor (19) is arranged so as to be covered by and / or adjacent to the control unit (22) when viewed in a plan view of the braking force generator (1) whose line of sight corresponds to the sliding direction (7) of the actuator element (13).

Description

[Technical Field]

[0001] The present invention relates to a brake force generator for an operating device of a brake system, the brake force generator comprising a slidably supported actuator element, an electric motor designed to move the actuator element, a control unit for controlling the electric motor, an input rod connectable to or connected to a brake pedal and slidably supported on the input rod, a stroke sensor having a transmitter and a receiver and arranged corresponding to the input rod, and a communication circuit electrically connected at one end to the receiver and at the other end to the control unit.

[0002] Furthermore, the present invention relates to an operating device for a brake system. [Background technology]

[0003] A hydraulic braking system of a motor vehicle typically includes a plurality of friction brake devices. To operate these friction brake devices, an operating device is typically provided, which comprises a master brake cylinder, in which at least one hydraulic piston is slidably supported. In this case, the master brake cylinder is fluidically connected to the slave cylinders of the friction brake devices so that the friction brake devices can be operated by the sliding of the hydraulic pistons.

[0004] Actuating devices with electromechanical brake force generators are increasingly being integrated into automotive structures. Such brake force generators include an electric motor and a slidably supported actuator element, where the electric motor is designed to move the actuator element. A control unit is provided to control the electric motor. Furthermore, electromechanical brake force generators have a slidably supported input rod, which is connected or connectable to a brake pedal. Typically, the control unit is designed to control the electric motor depending on the sliding position of the input rod. For this purpose, a stroke sensor is provided corresponding to the input rod, which has a transmitter and a receiver, and the receiver is communicatively connected to the control unit. In known electromechanical brake force generators, the communication connection is often achieved by electrically connecting the receiver via a communication cable to a connector device arranged on the main housing of the brake force generator. The connector device, in turn, is electrically connected to the control unit via a cable harness in the vehicle having the brake force generator. Such a type of communication technical connection is, on the one hand, technically complex, and, on the other hand, construction space is shielded by the connector arrangement.

[0005] Patent Document 1 discloses an electromechanical braking force generator having an internal communication technical connection. The braking force generator itself has a communication circuit, one end of which is electrically connected to a receiver and the other end of which is electrically connected to a control unit. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] German Patent Publication No. 102019203511 Summary of the Invention [Effects of the Invention]

[0007] The operating device according to the invention, having the features of claim 1, has the advantage that the communication connection between the receiver and the control unit is technically simplified compared to known solutions. For this purpose, the invention provides that the stroke sensor is arranged so that it is covered by and / or adjacent to the control unit in a plan view of the brake force generator, the line of sight of which corresponds to the sliding direction of the actuator element. Since the control unit covers the stroke sensor in a plan view, the stroke sensor is arranged behind the control unit in the sliding direction. If the stroke sensor is adjacent to the control unit in a plan view, the stroke sensor is located entirely next to the control unit in a plan view, preferably immediately adjacent to the control unit. This does not mean that the stroke sensor is located at the same height as the control unit in the sliding direction, since the feature "adjacent to the control unit" only applies to a plan view. Preferably, the control unit and the stroke sensor are spaced apart from each other in the sliding direction. If the stroke sensor is covered by and adjacent to the control unit in plan view, a first section of the stroke sensor is covered by the control unit in plan view, and a second section of the stroke sensor is adjacent to the control unit. In Patent Document 1, various elements, such as the master brake cylinder and actuator elements, are arranged between the stroke sensor and the control unit in plan view. In this arrangement of the stroke sensor, the stroke sensor is spaced apart from the control unit in plan view. This makes communication between the stroke sensor and the control unit difficult, since the communication circuit must be routed around the actuator elements, for example. According to the present invention, the stroke sensor is arranged corresponding to the input rod.In this regard, the transmitter or receiver is fixed to the input rod or to an element mechanically connected to the input rod so as to slide together with the input rod when the input rod slides. Preferably, the sensor is fixed to the input rod or to an element connected to the input rod. Preferably, the input rod and the actuator element are slidable relative to one another. According to the invention, the brake force generator has a communication circuit. Preferably, the communication circuit extends at least approximately through one or more housings of the brake force generator. The actuator element of the brake force generator is, for example, a spindle of a spindle transmission of the brake force generator.

[0008] In a preferred embodiment, the receiver is fixed to the actuator element. For example, the receiver is fixed directly, i.e., directly to the actuator element. Alternatively, the receiver is fixed to an element mechanically connected to the actuator element so that it slides together with the actuator element when the actuator element slides. In such a fixing, the receiver is fixed indirectly, i.e., via an intervening member, to the actuator element. The transmitter is then fixed to the input rod or to an element connected to the input rod. In this respect, the stroke sensor is configured as a differential stroke sensor. Alternatively, the stroke sensor is preferably configured as an absolute stroke sensor. The stroke sensor is therefore designed to calculate the stroke difference between the actual sliding position of the input rod and the base position that the input rod occupies when not being operated.

[0009] According to a preferred embodiment, the communication circuit includes a communication cable. The communication cable allows the movement of the receiver relative to the control unit to be compensated for due to the flexible configuration of the communication cable. It is particularly preferred that the communication cable is configured as a flexible flat cable. A flat cable can be understood as a cable whose width is greater than its height, in particular a cable that is significantly larger, and in which both the width and the height (at least in the straight, unbent state of the flat cable) are aligned perpendicular to the extension direction of the wires of the flat cable or to the extension direction of the flat cable itself. To this extent, a flexible flat cable is preferred, since a flat cable advantageously undergoes predetermined deformations, namely deformations around multiple axes aligned in the width direction of the flat cable. On the other hand, flat cables are relatively rigid with respect to deformations around multiple axes aligned in the height direction of the flat cable. Therefore, it is relatively easy to predict how the flat cable will be deformed during a movement of the receiver. Accordingly, contact between the flat cable and movable elements of the actuating device, such as the gearing of the actuating device, is avoided.

[0010] In a preferred embodiment, the communication cable has a U-shape, and the legs of the U-shape are aligned parallel to the sliding direction, which allows the communication cable to be arranged / positioned space-savingly. Due to the U-shape, when the receiver is slid, one leg of the U-shape becomes shorter, while the other leg becomes longer.

[0011] In a preferred embodiment, the communication cable is designed so that the U-shaped bend faces away from the control unit. This ensures that both ends of the communication cable are properly guided to the receiver or the control unit. Particularly preferably, the communication cable is turned only once along its entire length, i.e., in the region of the U-shaped bend. In a preferred embodiment, the communication cable is directly connected to the receiver.

[0012] In a preferred embodiment, the communication circuit has at least one contact spring, which is electrically connected directly to the control unit. Electrical connection between the control unit and the communication circuit by means of a contact spring is particularly preferred, since the contact spring can compensate for at least slight movements in the sliding direction.

[0013] According to a preferred embodiment, the communication circuit has stamped contacts, and the communication cable is electrically connected to the contact springs by the stamped contacts. The communication cable is electrically connected to the control unit using the stamped contacts and the contact springs. The provision of stamped contacts is particularly preferred because, on the one hand, they are mechanically robust and, on the other hand, they can be manufactured particularly inexpensively. In a preferred embodiment, the stamped contacts have an elongated base body, with a contact plate arranged at one end of the base body, aligned perpendicular to the sliding direction, and supported by the contact springs. In this respect, the stamped contacts are L-shaped.

[0014] In a preferred embodiment, the communication cable is electrically connected to the stamped contacts by resistance welding, which is technically simple and inexpensive.

[0015] According to a preferred embodiment, the brake force generator has a main housing, in particular consisting of multiple parts, the stroke sensor is arranged in the main housing, the main housing has a first housing wall with a mounting surface, and the control unit is mounted on this first housing wall. Since the control unit is mounted on the housing wall of the main housing, the communication circuit can be guided from the receiver to the control unit without sections of this communication circuit extending outside the housing.

[0016] According to a preferred embodiment, the first housing wall has an opening that is coaxial with the opening in the housing wall of the control unit housing of the control unit, and the contact springs are engaged through the openings. This provides a suitable connection between the control unit and the communication circuit. In a preferred embodiment, the springs are guided through the opening in the first housing wall or through the opening in the housing wall of the control unit housing.

[0017] Preferably, the brake force generator has a sealing element disposed between the control unit housing and the first housing wall and surrounding the contact spring, which prevents liquid from reaching the inside of the main housing or the inside of the control unit housing. Preferably, the sealing element is an O-ring or a wet seal.

[0018] According to a preferred embodiment, a protrusion is arranged on the inner side of the first housing wall facing away from the control unit, and the protrusion supports the stamped contact. This prevents the weight of the stamped contact and the weight of the communication cable from loading the contact spring. In a preferred embodiment, the protrusion is a plastic protrusion. In a preferred embodiment, the stamped contact is fixed to the protrusion by a rigid connection.

[0019] Alternatively, the stamped contact part is fixed to the protrusion by a connection part that allows at least slight movement of the stamped contact part relative to the protrusion. In a preferred form, the stamped contact part has at least one barb and is fixed to the protrusion by being pressed into the protrusion. Alternatively, the stamped contact part is fixed to the protrusion by being fitted between two parts of the protrusion. In a preferred form, the protrusion is fixed to the first housing wall. Alternatively, the protrusion is formed integrally with the first housing wall.

[0020] Preferably, the projection is connected to the first housing wall by a locking connection, for example provided by a clip.

[0021] According to a preferred embodiment, the braking force generator has a support element that rests on the lug on the one hand and on the second housing wall facing the first housing wall on the other hand, i.e. forces acting on the lug in a direction away from the first housing wall are supported by the support element, thereby ensuring a secure fixation of the lug in the first housing wall.

[0022] The actuating device according to the invention for a braking system has a master brake cylinder and is distinguished by a brake force generator according to the invention according to the features of claim 15, in which case the master brake cylinder can be actuated by the brake force generator, thereby also achieving the aforementioned advantages. Further preferred features and feature combinations can be taken from the description and the claims. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 2 is a cross-sectional view of a braking force generator of the braking system. [Figure 2] FIG. 2 is a perspective view of a braking force generator. [Figure 3] FIG. 2 is a diagram showing a communication circuit of a braking force generator. [Figure 4] FIG. 10 is a view showing a stamped contact portion of a communication circuit of the braking force generator. [Figure 5] FIG. 2 is a plan view of a braking force generator. DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention will be described in detail below with reference to the drawings.

[0025] 1 shows a longitudinal section of a brake force generator 1 of an actuation device 2 of a brake system. The actuation device 2 has the brake force generator 1 as well as a master brake cylinder 3 (not shown in FIG. 1), in which at least one hydraulic piston 4 is slidably supported.

[0026] The brake force generator 1 has a slidably supported input rod 5. The input rod 5 is slidable in a first direction 6 and in a second direction 7 opposite to the first direction 6. These directions 6 and 7 are therefore sliding directions of the input rod 5. The first direction 6 is also referred to hereinafter as the actuation direction 6. The input rod 5 has a first end 8 that can be connected to a brake pedal. When the first end 8 is connected to the brake pedal, the input rod 5 can be slid by the brake pedal. The input rod 5 is mechanically coupled to an input piston 9 such that the input piston 9 slides together with the input rod 5 when the input rod 5 slides. The input piston 9 is mechanically coupled to an input element 10 such that the input element 10 slides together with the input piston 9 when the input piston 9 slides. That is, the input element 10 is mechanically coupled to the input rod 5 by means of the input piston 9.

[0027] When the input rod 5 is slid in the operating direction 6, a force acting in the operating direction 6 is transmitted to the thrust washer 11 by means of the input piston 9, causing the thrust washer 11 to slide in the operating direction 6. The thrust washer 11 is mechanically connected to the hydraulic piston 4 by means of a push rod 12 so that the hydraulic piston 4 can slide in the operating direction 6 by the sliding of the thrust washer 11. When the hydraulic piston 4 is slid in the operating direction 6, hydraulic fluid is transferred from the master brake cylinder 3 to a friction brake cylinder of a friction brake device of the brake system. A deceleration torque is therefore generated by the friction brake device. The master brake cylinder 3 can be operated by the sliding of the input rod 5.

[0028] Furthermore, the brake force generator 1 has an actuator element 13. The actuator element 13 is also slidable in directions 6 and 7. Directions 6 and 7 are also the sliding directions of the actuator element 13. The actuator element 13 is mechanically coupled to an actuator disc 14 so that the actuator disc 14 slides together with the actuator element 13 when the actuator element 13 slides. When the actuator element 13 slides in the operating direction 6, the force acting in the operating direction 6 is transmitted to the thrust washer 11 by means of the actuator disc 14, causing the thrust washer 11 to slide in the operating direction 6. The master brake cylinder 3 can be operated by the sliding of the actuator element 13.

[0029] The brake force generator 1 further comprises an electric motor 15, not shown in FIG. 1 . The electric motor 15 is designed to slide the actuator element 13. For this purpose, in this embodiment, the electric motor 15 is operatively connected to the actuator element 13 by means of a transmission 16. The transmission 16 comprises a spindle transmission 17. The spindle transmission 17 comprises a spindle nut 18, which is rotatably supported about a rotation axis extending in the operating direction 6. The spindle transmission 17 further comprises a spindle, which is formed by the actuator element 13. The external thread of the actuator element 13 meshes with the internal thread of the spindle nut 18, so that the actuator element 13, i.e., the spindle, can be slid by rotating the spindle nut 18.

[0030] The brake force generator 1 further comprises a stroke sensor 19, which in this embodiment comprises a transmitter 20 with at least one magnet and a receiver 21 with at least one magnetic field-sensitive element. In this embodiment, the transmitter 20 is fixed to the input element 10. In this sense, the transmitter 20 is indirectly fixed to the input rod 5 and is mechanically connected to the input rod 5 so that the transmitter 20 slides together with the input rod 5 as the input rod 5 slides. The transmitter 20 is arranged on the input element 10, so that the stroke sensor 19 is associated with the input rod 5. The receiver 21 is fixed to the actuator disk 14 in this embodiment. In this sense, the receiver 21 is indirectly fixed to the actuator element 13 and is mechanically connected to the actuator element 13 so that the receiver 21 slides together with the actuator element 13 as the actuator element 13 slides. Due to the arrangement of the transmitter 20 and the receiver 21, the stroke sensor 19 is configured as a differential stroke sensor.

[0031] The brake force generator 2 further comprises a multi-part main housing 23. The main housing 23 comprises a first housing part 54 and a second housing part 25 fixed to the first housing part 54. Within the main housing 23, for example, the transmission 16, the thrust washer 11, the push rod 12, the actuator element 13 and the stroke sensor 19 are arranged.

[0032] The brake force generator 2 further comprises a control unit 22 for controlling the electric motor 15. This control unit 22 is also not shown in FIG. 1. The control unit 22 is designed to control the electric motor 15 depending on the sensor signal of the stroke sensor 19 or the sliding position of the input rod 5. In this case, the control unit 22 is spaced apart from the stroke sensor 19 in the directions 6 and 7.

[0033] To connect the control unit 22 and the stroke sensor 19 via communication technology, the braking force generator 1 has a communication circuit 24. For clarity, the communication circuit 24 is not shown in Figure 1. The configuration of the communication circuit 24 will be described in detail below with reference to Figures 2 to 4.

[0034] 2, the second housing portion 25 of the main housing 23 has a first housing wall 26. The first housing wall 26 has a mounting surface 27 on which the control unit 22 or a control unit housing 28 of the control unit 22 is mounted from the outside. In other words, the control unit 22 is disposed on the outside of the main housing 23.

[0035] The communication circuit 24 includes a communication cable 29. In this embodiment, the communication cable 29 is a flexible flat cable 29. One end of the communication cable 29 is electrically connected directly to the receiver 21. The other end of the communication cable 29 is electrically connected to a stamped contact portion 30 of the communication circuit 24. In this embodiment, the communication cable 29 is electrically connected to the stamped contact portion 30 by resistance welding. The stamped contact portion is a contact portion manufactured by stamping.

[0036] As shown in Figure 3, the stamped contact portion 30 has an elongated base body 31. A first end 32 of the base body 31 has a contact plate 33. The stamped contact portion 30 is generally L-shaped. The contact plate 33 is aligned perpendicular to directions 6 and 7.

[0037] The first housing wall 26 has an opening 34 that is coaxial with an opening 35 in a housing wall 50 of the control unit housing 28. The stamped contact 30 is electrically connected to the control unit 22 by a plurality of contact springs 36 of the communication circuit 24, only one of which is shown in FIG. 3 . The contact spring 36 is in through-engagement with the opening 34 in the first housing wall 26 or the opening 35 in the housing wall 50 of the control unit housing 28. A sealing element 37 is arranged between the control unit housing 28 and the first housing wall 26, and the sealing element 37 surrounds the contact spring 36.

[0038] In this embodiment, the communication circuit 24 is formed by a communication cable 29, a stamped contact portion 30 and a contact spring 36.

[0039] 2, the braking force generator 1 further comprises a plastic projection 38, which is arranged on an inner surface 39 of the first housing wall 26 facing away from the control unit 22. The plastic projection 38 supports the stamped contact 30. That is, the stamped contact 30 is fixed to the plastic projection 38, for example by means of a rigid connection or a connection that allows at least a slight movement of the stamped contact 30 relative to the plastic projection 38.

[0040] 4, the stamped contact portion 30 in this embodiment has a plurality of barbs 39. Preferably, the stamped contact portion 30 is pressed into the plastic projection 38 such that the stamped contact portion 30 is secured to the plastic projection 38 by form-fitting with the barbs 39.

[0041] The plastic projection 38 is fixed in this example to the first housing wall 26 by a locking connection. Furthermore, a support element 40 is provided, which bears on the one hand against the plastic projection 38 and on the other hand against a second housing wall 41 facing the first housing wall 26. In this respect, the plastic projection 38 is loaded by the support element 40 with a force acting in the operating direction 6 and is pressed against the first housing wall 26.

[0042] 2, the communication cable 29 is arranged or configured such that it has a U-shape 42. In this case, the communication cable 29 has a first leg 43 that starts from the receiver 21 and extends in a direction opposite to the operating direction 6, i.e., in direction 7. A U-shaped curved portion 44 extends from the first leg 43, pointing away from the control unit 22, i.e., in direction 7. A second leg 45 follows the curved portion 44 and extends from the curved portion 44 towards the control unit 22, i.e., in the operating direction 6.

[0043] The arrangement of the stroke sensor 19 relative to the control unit 22 will be explained in more detail below with the aid of FIG. 5. For this purpose, FIG. 5 shows a plan view of the brake force generator 1. In this case, the viewing direction corresponds to the sliding direction of the actuator element 13, i.e., direction 7. As shown in FIG. 5, the stroke sensor 19 is arranged so that the control unit 22, shown in dashed lines in FIG. 5, covers the stroke sensor 19. Due to this arrangement of the stroke sensor 19, the communication technical connection of the receiver 21 with the control unit 22 is technically simple via the communication circuit 24. In this exemplary embodiment, the elements of the communication circuit 24, i.e., the communication cable 29, the stamped contact 30, and the contact spring 26, are also arranged so that the control unit 22 covers these elements.

[0044] In known brake force generators, the stroke sensor 19 is arranged in a typical manner in the area 46 in the plan view shown in Fig. 5. With this arrangement of the stroke sensor 19, the actuator element 13 as well as the other elements of the brake force generator 1 are located between the stroke sensor 19 and the control unit 22 in the plan view. This means that the stroke sensor 19 is arranged at a distance from the control unit 22 in the plan view. This arrangement of the stroke sensor 19 makes the communication connection between the control unit 22 and the receiver 21 difficult. [Explanation of symbols]

[0045] 1 Brake force generator 2 Control device 3 Master brake cylinder 4 hydraulic pistons 5 Input Rod 6 First direction, operation direction 7 Second Direction 8 First End 9 Input piston 10 Input Elements 11 Thrust washer 12 push rod 13 Actuator element, spindle 14 Actuator disc 15 Electric motor 16 Transmission 17 Spindle transmission device 18 Spindle nut 19 Stroke sensor 20 Transmitter 21 Receiver 22 Control unit 23 Main Housing 24 Communication Circuit 25 Second housing part 26 First Housing Wall 27 Mounting surface 28 Control unit housing 29 Communication cables, flat cables 30 Punched contact part 31 Vertical base 32 first end 33 Contact Plate 34,35 aperture 36 Contact spring 37 Sealing element 38 Plastic protrusion 39 Inner surface 39 Gyakuhaku 40 Support element 41 Second Housing Wall 42 U-shaped 43 First Leg 44 Curved section 45 Second Leg 46 areas 50 Housing Wall 54 first housing part

Claims

1. A brake force generator for an operating device of a brake system, the brake force generator comprising: a slidably supported actuator element (13); an electric motor (15) designed to slide the actuator element (13); a control unit (22) for controlling the electric motor (15); an input rod (5) connectable to or connected to a brake pedal and slidably supported; a stroke sensor (19) having a transmitter (20) and a receiver (21) and disposed corresponding to the input rod (5); and a communication circuit (24) electrically connected at one end to the receiver (21) and at the other end to the control unit (22), the stroke sensor (19) is arranged so as to be covered by and / or adjacent to the control unit (22) in a plan view of the braking force generator (1) whose line of sight corresponds to the sliding direction (7) of the actuator element (13), A brake force generator for an operating device of a brake system, characterized in that the receiver (21) is fixed to the actuator element (13).

2. A brake force generator for an operating device of a brake system, comprising: an actuator element (13) slidably supported; an electric motor (15) designed to slide the actuator element (13); a control unit (22) for controlling the electric motor (15); an input rod (5) connectable to or connected to a brake pedal and slidably supported; a stroke sensor (19) having a transmitter (20) and a receiver (21) and arranged corresponding to the input rod (5); and a communication circuit (24) having one end electrically connected to the receiver (21) and the other end electrically connected to the control unit (22), the stroke sensor (19) is arranged so as to be covered by and / or adjacent to the control unit (22) in a plan view of the braking force generator (1) whose line of sight corresponds to the sliding direction (7) of the actuator element (13), The communication circuit (24) includes a communication cable (29), 1. A brake force generator for an operating device of a brake system, characterized in that the brake force generator (1) has a main housing (23) consisting of multiple parts, the stroke sensor (19) is arranged in the main housing (23), the main housing (23) has a first housing wall (26) with a mounting surface (27), and the control unit (22) is mounted on the first housing wall (26).

3. A brake force generator as described in claim 2, characterized in that the communication cable (29) has a U-shape (42) and the legs (43, 45) of the U-shape (42) are aligned parallel to the sliding direction (7).

4. A brake force generator as described in claim 3, characterized in that the communication cable (29) is designed so that the curved portion (44) of the U-shape (42) faces away from the control unit (22).

5. A brake force generator as described in claim 2, characterized in that the communication circuit (24) has at least one contact spring (36), which is directly electrically connected to the control unit (22).

6. A brake force generator as described in claim 5, characterized in that the communication circuit (24) has a punched contact portion (30) and the communication cable (29) is electrically connected to the contact spring (36) by the punched contact portion (30).

7. A braking force generator as described in claim 6, characterized in that the communication cable (29) is electrically connected to the punched contact portion (30) by resistance welding.

8. A brake force generator as described in claim 5 or 6, characterized in that the first housing wall (26) has an opening (34) which is positioned coaxially with an opening (35) in the housing wall (50) of the control unit housing (28) of the control unit (22), and the contact spring (36) is engaged through the multiple openings (34, 35).

9. A brake force generator as described in claim 8, characterized in that a sealing element (37) is provided between the control unit housing (28) and the first housing wall (26) and surrounding the contact spring (36).

10. A brake force generator as described in claim 6 or 7, characterized in that a protrusion (38) is arranged on the inner surface (39) of the first housing wall (26) opposite the control unit (22), and the protrusion (38) supports the punched contact portion (30).

11. A braking force generator as claimed in claim 10, characterized in that the protrusion (38) is connected to the first housing wall (26) by a locking connection.

12. A brake force generator as described in claim 10, characterized in that a support element (40) is provided which is supported on the protrusion (38) on the one hand and on a second housing wall (41) facing the first housing wall (26) on the other hand.

13. An operating device for a brake system, comprising a master brake cylinder (3) and a brake force generator (1) as described in claim 1 or 2, wherein the master brake cylinder (3) is operable by the brake force generator (1).

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