Braking force generator for an actuation device of a brake system, actuation device for a brake system

Abstract

A braking force generator for an actuation device of a brake system. The braking force generator includes a movably supported actuator element, an electric motor which is designed to move the actuator element, a controller for controlling the electric motor, a movably supported input rod which is coupled or can be coupled to a brake pedal, a displacement sensor which is assigned to the input rod and has a transmitter and a receiver, and a communication path which is electrically connected to the receiver at one end and to the controller at the other end. The displacement sensor is arranged so as to be covered by the controller and/or adjoin the controller in plan view of the braking force generator, the viewing direction in said plan view corresponding to the movement direction of the actuator element.

Claims

1. A braking force generator for an actuation device of a brake system, comprising: a movably supported actuator element; an electric motor configured to move the actuator element; a controller configured to control the electric motor; a movably supported input rod which is coupled or can be coupled to a brake pedal; a displacement sensor assigned to the input rod and having a transmitter and a receiver; and a communication path which is electrically connected to the receiver at one end and to the controller at another end; wherein the displacement sensor is arranged so as to be covered by the controller and/or adjoin the controller in a plan view of the braking force generator, a viewing direction in the plan view corresponding to a movement direction of the actuator element.

2. The braking force generator according to claim 1, wherein the receiver is fastened to the actuator element.

3. The braking force generator according to claim 1, wherein the communication path has a communication cable including a flat flexible ribbon cable.

4. The braking force generator according to claim 1, wherein the communication cable has a U shape, wherein legs of the U shape are aligned in parallel with the movement direction.

5. The braking force generator according to claim 4, wherein the communication cable is configured such that a bulge of the U shape faces away from the controller.

6. The braking force generator according to claim 1, wherein the communication path has at least one contact spring, wherein the contact spring is directly electrically connected to the controller.

7. The braking force generator according to claim 6, wherein the communication path has a stamped contact part, wherein the communication cable is electrically connected to the contact spring via the stamped contact part.

8. The braking force generator according to claim 7, wherein the communication cable is electrically connected to the stamped contact part by resistance welding.

9. The braking force generator according to claim 1, wherein the braking force generator has a multi-part main housing, wherein the displacement sensor is arranged in the main housing, and wherein the main housing has a first housing wall with a bearing surface on which the controller rests.

10. The braking force generator according to claim 9, wherein the first housing wall has an aperture which is aligned with an aperture of a housing wall of a controller housing of the controller, and the contact spring engages the controller through the apertures.

11. The braking force generator according to claim 10, further comprising a sealing element which is arranged between the controller housing and the first housing wall and encloses the contact spring.

12. The braking force generator according to claim 9, wherein the communication path has a stamped contact part, wherein the communication cable is electrically connected to the contact spring via the stamped contact part, and wherein a plastic projection is arranged on an inner surface of the first housing wall facing away from the controller, and the projection carries the stamped contact part.

13. The braking force generator according to claim 12, wherein the projection is connected to the first housing wall by a latching connection.

14. The braking force generator according to claim 12, further comprising a support element which is supported on the projection and on a second housing wall opposite the first housing wall.

15. An actuation device for a brake system, comprising: a master brake cylinder; and a braking force generator, the master brake cylinder being actuated by the braking force generator, wherein the braking force generator includes: a movably supported actuator element, an electric motor configured to move the actuator element, a controller configured to control the electric motor, a movably supported input rod which is coupled or can be coupled to a brake pedal, a displacement sensor assigned to the input rod and having a transmitter and a receiver, and a communication path which is electrically connected to the receiver at one end and to the controller at another end, wherein the displacement sensor is arranged so as to be covered by the controller and/or adjoin the controller in a plan view of the braking force generator, a viewing direction in the plan view corresponding to a movement direction of the actuator element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a sectional representation of a braking force generator of a brake system, according to an example embodiment of the present invention.

(2) FIG. 2 is a perspective representation of the braking force generator, according to an example embodiment of the present invention.

(3) FIG. 3 shows a communication path of the braking force generator, according to an example embodiment of the present invention.

(4) FIG. 4 shows a stamped contact part of the communication path of the braking force generator, according to an example embodiment of the present invention.

(5) FIG. 5 is a plan view of the braking force generator, according to an example embodiment of the present invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

(6) FIG. 1 shows a longitudinal section through a braking force generator 1 of an actuation device 2 of a brake system. The actuation device 2 has the braking force generator 1 along with a master brake cylinder 3 (not shown) in FIG. 1, in which master brake cylinder at least one hydraulic piston 4 is movably supported.

(7) The braking force generator 1 has a movably supported input rod 5. The input rod 5 is movable in a first direction 6 and in a second direction 7 opposite the first direction 6. The directions 6 and 7 are thus movement directions of the input rod 5. In the following, the first direction 6 is also referred to as the actuation direction 6. The input rod 5 has a first end 8 which can be coupled to a brake pedal. If the first end 8 is coupled to a brake pedal, the input rod 5 is movable by the brake pedal. The input rod 5 is mechanically coupled to an input piston 9 such that the input piston 9 is moved along with the input rod 5 when the input rod 5 is moved. The input piston 9 is mechanically coupled to an input element 10 such that the input element 10 is moved along with the input piston 9 when the input piston 9 is moved. The input element 10 is thus mechanically coupled to the input rod 5 by means of the input piston 9.

(8) If the input rod 5 is moved in the actuating direction 6, a force acting in the actuation direction 6 is transmitted to a thrust washer 11 by means of the input piston 9, and the thrust washer 11 is moved in the actuation direction 6. The thrust washer 11 is mechanically coupled to the hydraulic piston 4 by means of a thrust rod 12 such that the hydraulic piston 4 can be moved in the actuation direction 6 by moving the thrust washer 11. If the hydraulic piston 4 is moved in the actuation direction 6, a hydraulic fluid is shifted from the master brake cylinder 3 into wheel brake cylinders of friction brake devices of the brake system. As a result, a deceleration torque is generated by the friction braking devices. The master brake cylinder 3 can thus be actuated by moving the input rod 5.

(9) The braking force generator 1 also has an actuator element 13. The actuator element 13 can also be moved in directions 6 and 7. Thus, the directions 6 and 7 are also movement directions of the actuator element 13. The actuator element 13 is mechanically coupled to an actuator washer 14 such that the actuator washer 14 is moved along with the actuator element 13 when the actuator element 13 is moved. If the actuator element 13 is moved in the actuation direction 6, a force acting in the actuation direction 6 is transmitted to the thrust washer 11 by means of the actuator washer 14, and the thrust washer 11 is moved in the actuation direction 6. Thus, the master brake cylinder 3 can be actuated by moving the actuator element 13.

(10) The braking force generator 1 also has an electric motor 15 (not shown in FIG. 1). The electric motor 15 is designed to move the actuator element 13. For this purpose, the electric motor 15 in the present case is operatively connected to the actuator element 13 by a gear device 16. The gear device 16 has a spindle gear 17. The spindle gear 17 has a spindle nut 18 which is supported so as to be rotatable about an axis of rotation extending in the actuation direction 6. The spindle gear 17 also has a spindle. The spindle is formed by the actuator element 13. An external thread of the actuator element 13 meshes with an internal thread of the spindle nut 18 such that the actuator element 13, i.e. the spindle, can be moved by a rotation of the spindle nut 18.

(11) The braking force generator 1 also has a displacement sensor 19. This comprises a transmitter 20, which in the present case has at least one magnet, and a receiver 21, which in the present case has at least one magnetic field-sensitive element. In the present case, the transmitter 20 is fastened to the input element 10. In this respect, the transmitter 20 is indirectly fastened to the input rod 5 and is correspondingly mechanically coupled to the input rod 5 such that the transmitter 20 is moved along with the input rod 5 by a movement of the input rod 5. Due to the arrangement of the transmitter 20 on the input element 10, the displacement sensor 19 is assigned to the input rod 5. In the present case, the receiver 21 is fastened to the actuator washer 14. In this respect, the receiver 21 is indirectly fastened to the actuator element 13 and is correspondingly mechanically coupled to the actuator element 13 such that the receiver 21 is moved along with the actuator element 13 by a movement of the actuator element 13. Due to the arrangement of the transmitter 20 and the receiver 21, the displacement sensor 19 is designed as a differential displacement sensor.

(12) The braking force generator 2 also has a multi-part main housing 23. The main housing 23 has a first housing part 54 and a second housing part 25 fastened to the first housing part 54. The gear device 16, the thrust washer 11, the thrust rod 12, the actuator element 13 and the displacement sensor 19, for example, are arranged in the main housing 23.

(13) The braking force generator 2 also has a controller 22 for controlling the electric motor 15. The controller 22 is also not shown in FIG. 1. The controller 22 is designed to control the electric motor 15 depending on the sensor signal from the displacement sensor 19 or a sliding position of the input rod 5.

(14) In this case, the controller 22 is spaced from the displacement sensor 19 with respect to directions 6 and 7.

(15) The braking force generator 1 has a communication path 24 for the communication connection of the controller 22 to the displacement sensor 19. For reasons of clarity, the communication path 24 is not shown in FIG. 1. The design of the communication path 24 is explained in more detail below with reference to FIGS. 2 through 4.

(16) As can be seen from FIG. 2, the second housing part 25 of the main housing 23 has a first housing wall 26. The first housing wall 26 has a bearing surface 27 on which the controller 22 or a controller housing 28 of the controller 22 rests from the outside. Thus, the controller 22 is located outside the main housing 23.

(17) The communication path 24 has a communication cable 29, which in the present case is a flexible flat ribbon cable 29. The communication cable 29 is electrically connected directly to the receiver 21 at one end. The communication cable 29 is electrically connected at the other end to a stamped contact part 30 of the communication path 24. In the present case, the communication cable 29 is electrically connected to the stamped contact part 30 by means of resistance welding. A stamped contact part is a contact part produced by stamping.

(18) As can be seen in FIG. 3, the stamped contact part 30 has an elongate base body 31. A first end 32 of the base body 31 has a contact plate 33. Thus, the stamped contact part 30 is designed in an L shape as a whole. The contact plate 33 is aligned perpendicularly to directions 6 and 7.

(19) The first housing wall 26 has an aperture 34, which is aligned with an aperture 35 of a housing wall 50 of the controller housing 28. The stamped contact part 30 is electrically connected to the controller 22 by a plurality of contact springs 36 of the communication path 24, wherein only a single one of the contact springs 36 is evident in FIG. 3. The contact springs 36 engage through the apertures 34 and 35 of the first housing wall 26 and the housing wall 50 of the controller housing 28, respectively. A sealing element 37 is arranged between the controller housing 28 and the first housing wall 26 to enclose the contact springs 36.

(20) The communication path 24 is thus formed in the present case by the communication cable 29, the stamped contact part 30 and the contact springs 36.

(21) As can be seen from FIG. 2, the braking force generator 1 further has a plastic projection 38, which is arranged on an inner surface 39 of the first housing wall 26 facing away from the controller 22. The plastic projection 38 supports the stamped contact part 30. Thus, the stamped contact part 30 is fastened to the plastic projection 38, for example, by means of a rigid connection or a connection that allows at least slight movement of the stamped contact part 30 relative to the plastic projection 38.

(22) As can be seen in FIG. 4, the stamped contact part 30 in the present case has several barbs 39. Preferably, the stamped contact part 30 is pressed into the plastic projection 38 such that the stamped contact part 30 is fastened to the plastic projection 38 by means of the barbs 39 by positive locking.

(23) In the present case, the plastic projection 38 is fastened to the first housing wall 26 by a latching connection. In addition, a support element 40 is provided, which is supported on the plastic projection 38 on the one hand and on a second housing wall 41 opposite the first housing wall 26 on the other hand. In this respect, the plastic projection 38 is subjected to a force acting in the actuation direction 6 by the support element 40 and is forced against the first housing wall 26.

(24) As can be seen from FIG. 2, the communication cable 29 is arranged or designed such that the communication cable 29 has a U shape 42. In this respect, the communication cable 29 has a first leg 43 which extends from the receiver 21 in a direction opposite the actuation direction 6, i.e. in the direction 7. Adjacent to the first leg 43 is a bulge 44 of the U shape facing away from the controller 22, i.e. in the direction 7. A second leg 45 adjoins the bulge 44 and extends from the bulge 44 in the direction of the controller 22, i.e. in the actuation direction 6.

(25) With reference to FIG. 5, the arrangement of the displacement sensor 19 relative to the controller 22 is explained in more detail below. For this purpose, FIG. 5 shows a plan view of the braking force generator 1. In this case, the viewing direction corresponds to a movement direction of the actuator element 13, namely the direction 7. As can be seen in FIG. 5, the displacement sensor 19 is arranged such that the controller 22 shown in dashed lines in FIG. 5 covers the displacement sensor 19. Due to this arrangement of the displacement sensor 19, the communication linkage of the receiver 21 to the controller 22 by means of the communication path 24 is technically simple. In the present case, the elements of the communication path 24, i.e. the communication cable 29, the stamped contact part 30 and the contact springs 26, are also arranged such that the controller 22 covers such elements.

(26) In conventional braking force generators, the displacement sensor 19 is usually arranged in a region 46 with reference to the plan view shown in FIG. 5. With such an arrangement of the displacement sensor 19, the actuator element 13 along with other elements of the braking force generator 1 are located between the displacement sensor 19 and the controller 22 with respect to the plan view. The displacement sensor 19 is then arranged such that it is spaced from the controller 22 with respect to the plan view. With such an arrangement of the displacement sensor 19, the communication linkage between the receiver 21 and the controller 22 is made more difficult.