Actuators for main brake cylinders, components for hydraulic braking systems

Abstract

The present invention relates to an operating device (4) for a main brake cylinder (2), the operating device (4) comprising a power train device (19) and an electric motor (9) driving the power train device (19), the power train device (19) having a spindle transmission (20) with a threaded spindle (22) and a spindle nut (21), the threaded spindle (22) or the spindle nut (21) being movable by the electric motor (9) for operating the main brake cylinder (2), the threaded spindle (22) movable by the electric motor (9) or the spindle nut (21) being assigned a spring element (41), the spring element (41) applying a return force to the threaded spindle (22) or the spindle nut (21) directed in a direction opposite to the operation of the main brake cylinder (2). [Solution] The spring element (41) is biased and held between the threaded spindle (22) and the spindle nut (21), and the threaded spindle (22) and / or the spindle nut (21) are rotatable relative to the spring element (41).

Description

[Technical Field]

[0001] The present invention relates to an operating device for a main brake cylinder, the operating device comprising a power train device and an electric motor driving the power train device, the power train device having a spindle transmission with a threaded spindle and a spindle nut, the threaded spindle or the spindle nut being movable by the electric motor for actuating the main brake cylinder, a spring element being assigned to the threaded spindle or the spindle nut movable by the electric motor, the spring element exerting a return force on the threaded spindle or the spindle nut directed in the direction opposite to the actuation of the main brake cylinder.

[0002] The invention further relates to a component for a hydraulic braking system, comprising an actuable main brake cylinder and an actuation device for operating the main brake cylinder. [Background technology]

[0003] A hydraulic brake system of a motor vehicle typically includes a plurality of friction brake devices, which are hydraulically connected to a main brake cylinder of the brake system. When the main brake cylinder is operated, hydraulic fluid is transferred from the main brake cylinder into a slave cylinder of the friction brake device, which then generates a friction braking moment. An operating device is typically present for operating the main brake cylinder. As motor vehicles become increasingly electrified, the operating device of the brake system is also becoming increasingly electrified. For this purpose, the operating device includes a power train device and an electric motor that drives the power train device. The power train device often includes a spindle drive with a threaded spindle and a spindle nut. The threaded spindle or the spindle nut can be moved by the electric motor to operate the main brake cylinder.

[0004] The applicant's previously unpublished patent application describes an operating device in which a threaded spindle can be moved by an electric motor. To ensure the return of the moved threaded spindle even in the event of an electric motor failure, a spring element is assigned to the threaded spindle, which exerts a return force on the threaded spindle directed in the opposite direction to the operation of the main brake cylinder. The return force pushes the threaded spindle away from the main brake cylinder. The spring element is biased and held between the threaded spindle and a bearing shield fixed to the housing. To bridge the radial offset between the threaded spindle and the bearing shield, the spring element is conically tapered. Summary of the Invention

[0005] The operating device according to the invention, having the features of claim 1, has the advantage that the load on the electric motor and the powertrain device can be reduced compared to known operating devices. For this purpose, according to the invention, a spring element is biased and held between the threaded spindle and the spindle nut, and the threaded spindle and / or the spindle nut are rotatable relative to the spring element. In the case of a conically tapering spring element, the spring characteristic curve is typically nonlinear. Instead, the restoring force provided increases more than proportionally as the spring element is compressed. The use of a conically tapering spring element in an operating device for a main brake cylinder therefore leads to increased loads on the electric motor and the powertrain device. Because the spring element is biased and held between the threaded spindle and the spindle nut according to the invention, the use of a conically tapering spring element is unnecessary. At most, a smaller radial offset between the threaded spindle and the spindle nut is bridged. In the case of a spindle transmission, the threaded spindle and the spindle nut are rotatable relative to each other. When the terms "axial" and "radial" are used within the scope of the disclosure, these terms relate to the rotation axis of the rotatably supported transmission element of the spindle transmission, unless a different reference is explicitly disclosed. To prevent torque from being applied to the spring element by rotation of the rotatably supported transmission element of the spindle transmission, i.e., the spindle nut or the threaded spindle, the threaded spindle and / or the spindle nut are rotatable relative to the spring element. In particular, only the threaded spindle is rotatable relative to the spring element. A first end of the spring element, assigned to the threaded spindle, is rotatably supported on the threaded spindle. A second end of the spring element, assigned to the spindle nut, is non-rotatably connected to the spindle nut. Alternatively, only the spindle nut is rotatable relative to the spring element. The second end of the spring element is in this case rotatably supported on the spindle nut.A first end of the spring element is non-rotatably connected to the threaded spindle. Alternatively, both the spindle nut and the threaded spindle are rotatable relative to the spring element. As previously mentioned, both the threaded spindle and the spindle nut can be movable by an electric motor. Preferably, the threaded spindle is movable by the electric motor. The spring element is arranged in this case to apply a return force to the threaded spindle directed in a direction opposite to the operation of the main brake cylinder. The return force pushes the threaded spindle, i.e., away from the main brake cylinder. Since the spring element is biased and held between the threaded spindle and the spindle nut according to the invention, the spring element in this case applies a force to the spindle nut directed in a direction opposite to the return force. Alternatively, preferably, the spindle nut is movable by the electric motor. The spring element is arranged in this case to apply a return force to the spindle nut directed in a direction opposite to the operation of the main brake cylinder. Since the spring element is held in a biased manner between the threaded spindle and the spindle nut according to the invention, the spring element in this case exerts a force on the threaded spindle that is directed in the opposite direction to the restoring force.

[0006] According to a preferred embodiment, the spring element is cylindrically shaped, which typically results in a linear spring characteristic curve, which is associated with low loads on the electric motor and the powertrain. According to an alternative embodiment, the spring element is conically tapered, with the opening angle of the conically tapered spring element being preferably less than 10°.

[0007] Preferably, the spring element is a coil spring, which is available at low cost. Particularly preferably, the threaded spindle and the spring element are arranged concentrically with one another.

[0008] According to one preferred embodiment, the threaded spindle has a first end remote from the main brake cylinder, and the spring element applies a return force to the first end of the threaded spindle. In this embodiment, the threaded spindle is displaceable by an electric motor. The first end of the threaded spindle is easily accessible for the placement of the spring element, so that this embodiment of the operating device can be structurally simple to realize.

[0009] According to a preferred embodiment, a sleeve is arranged on the first end of the threaded spindle, the sleeve protruding axially beyond the first end of the threaded spindle, and the first end of the spring element, which is assigned to the threaded spindle, is arranged on an axial stop of the sleeve. The first end of the spring element is therefore not arranged directly on the threaded spindle, but on the sleeve. The sleeve provides a particularly suitable structure for arranging the first end of the spring element. Preferably, the sleeve has a radial flaring portion that protrudes radially outward, the radial flaring portion forming an axial stop for the first end of the spring element. The radial flaring portion can bridge any radial offset that may exist between the threaded spindle and the spindle nut. According to an alternative embodiment, the first end of the spring element is preferably arranged directly on the threaded spindle.

[0010] Preferably, the sleeve is rotatably supported on the threaded spindle. At least the threaded spindle is, therefore, rotatable relative to the spring element. Since the first end of the threaded spindle is easily accessible, as mentioned above, the rotatable support of the sleeve on the threaded spindle can be realized structurally in a simple manner. Due to the small radial extension of the threaded spindle, the support of the sleeve on the threaded spindle can also be realized inexpensively. Preferably, the sleeve is rotatably supported on the threaded spindle by a rolling bearing having a plurality of rolling elements. However, the sleeve may also be rotatably supported on the threaded spindle by a plain bearing.

[0011] According to a preferred embodiment, the sleeve is axially secured on the threaded spindle by a clip ring that is fitted onto the threaded spindle. Preferably, the clip ring that secures the sleeve radially engages in a circumferential groove of the threaded spindle that opens radially outward. Preferably, the clip ring that secures the sleeve cooperates with the previously mentioned rolling elements of the rotary bearing. Alternatively, the clip ring that secures the sleeve cooperates directly with the sleeve.

[0012] According to a preferred embodiment, the second end of the spring element, which is assigned to the spindle nut, is arranged on an axial stop of the spindle nut that is axially opposite the axial stop of the sleeve. Because the two axial stops are axially opposite each other, a cylindrical spring element, in particular a cylindrical coil spring, can be used. In this case, the second end of the spring element directly abuts on the spindle nut, i.e., on the axial stop. According to an alternative embodiment, the second end abuts only indirectly on the spindle nut, for example, on an element rotatably supported on the spindle nut.

[0013] According to a preferred embodiment, the spindle nut has a first axial section facing the main brake cylinder and a second axial section facing away from the main brake cylinder, the first axial section having internal teeth assigned to the threaded spindle and the second axial section radially surrounding the spring element at least in part. Since the second axial section radially surrounds the spring element, it prevents the spring element from deflecting during operation. Preferably, a surrounding stop step is formed at the transition from the first axial section to the second axial section, forming an axial stop on which the second end of the spring element is located.

[0014] Preferably, the operating device comprises a pressure piston, which is movably supported in the axial through-hole of the threaded spindle and movable by an input rod, and the main brake cylinder is operable by movement of the pressure piston. The pressure piston is, in turn, movable by the input rod. The input rod is connectable or connected to the brake pedal, so that the pressure piston is, in turn, movable by operation of the brake pedal. Since the main brake cylinder is operable by movement of the pressure piston, the user can still operate the main brake cylinder even in the event of failure of the electric motor.

[0015] Preferably, the actuating device includes a further spring element that applies a restoring force to the threaded spindle and the pressure piston in a direction opposite to the actuation of the main brake cylinder. In this embodiment, the threaded spindle is the drive element of the spindle drive that can be moved by the electric motor. This further spring element is present in addition to the previously mentioned spring element. This further spring element can return both the threaded spindle and the pressure piston. The provision of a spring element and a further spring element, instead of a single spring element that applies a restoring force to both the drive element and the pressure piston, has the advantage that different restoring forces can be realized for the drive element and the pressure piston. By way of example only, the restoring force acting on the pressure piston should not exceed 200 N. However, in some cases, this type of restoring force may be insufficient to return the threaded spindle in the event of an electric motor failure. A spring element held in a biased manner between the threaded spindle and the spindle nut allows the return force acting on the threaded spindle to be increased without forcing the return force acting on the pressure piston to also increase.

[0016] According to a preferred embodiment, the threaded spindle and spindle nut are mechanically coupled to the pressure piston so that the threaded spindle and spindle nut are movable together with the movement of the pressure piston, at least in the event of failure of the electric motor. For example, the pressure piston is configured to transmit a force acting toward the main brake cylinder to the threaded spindle in response to movement of the pressure piston. The external teeth of the threaded spindle mesh with the internal teeth of the spindle nut so that force is also transmitted to the spindle nut by the threaded spindle. Since the threaded spindle and spindle nut are movable or are moved together in the event of failure of the electric motor, a spring element biased and held between the threaded spindle and the spindle nut is not compressed. Accordingly, the restoring force provided by this spring element does not need to be overcome by the brake pedal user in the event of failure of the electric motor.

[0017] According to a preferred embodiment, the power train device has a worm wheel that radially surrounds the spindle nut, with a radially inwardly oriented multi-tooth profile of the worm wheel meshing with a radially outwardly oriented multi-tooth profile of the spindle nut. During fault-free operation of the electric motor, a reaction force acting between the multi-tooth profiles prevents the spindle nut from being displaced axially. In the event of a failure of the electric motor, this reaction force is eliminated, so that the spindle nut and the threaded spindle are then both movable.

[0018] Preferably, the toothed profile of the spindle nut is formed on at least a partial section of the second axial section of the spindle nut, which has the advantage that the toothed profiles remain engaged with each other even when the spindle nut moves axially. Preferably, the toothed profile of the spindle nut extends to the end of the second axial section remote from the main brake cylinder.

[0019] The component according to the invention is characterized in that the operating device is formed in accordance with the invention with the features of claim 15. This also results in the advantages already mentioned. Further preferred features and feature combinations can be seen from the above description and the claims.

[0020] The present invention will be described in detail below with reference to the drawings. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 shows a component group for a hydraulic braking system. [Figure 2] FIG. [Figure 3] FIG. 10 is another cross-sectional view of the structural group. DETAILED DESCRIPTION OF THE INVENTION

[0022] 1 shows a perspective view of a component 1 for a hydraulic braking system of a motor vehicle (not shown in detail). The component 1 comprises an actuable main brake cylinder 2, which has hydraulic connections 3. Two hydraulic pistons 13, not visible in FIG. 1, are movably supported in the main brake cylinder 2. When the component 1 is properly installed in the brake system, the hydraulic connections 3 are hydraulically connected to the slave cylinders of the friction brake devices of the brake system, so that the friction brake devices can be actuated by operating the main brake cylinder 2.

[0023] The component 1 further comprises an actuating device 4 for operating the main brake cylinder 2. The actuating device 4 comprises a housing 5. The main brake cylinder 2 is arranged on a first end face 12 of the housing 5. The housing 5 is here tubular and has a surrounding wall 6 that encloses a housing interior 7 of the housing 5. The actuating device 4 further comprises a drive unit 8, which is arranged in the housing 5. The drive unit 8 has an electric motor 9, which is arranged in a motor housing 10 and is therefore not visible in FIG. 1. The actuating device 4 further comprises a control device 11, which is arranged in the housing 5 on the side of the housing 5 facing away from the drive unit 8. The control device 11 is designed to operate and control the electric motor 9.

[0024] The configuration of the actuating device 4 will be explained in more detail below, additionally with reference to FIGS. 2 and 3. For this purpose, FIG. 2 shows a cross-sectional view of the component group 1. FIG. 3 shows a cross-sectional view of an excerpt from the actuating device 4. The actuating device 4 comprises a movable connecting element 14. The connecting element 14 here has an elastically deformable connecting disc 15 and a rigid connecting rod 16. The connecting element 14 is movable in a first direction 17 and in a second direction 18 opposite to the first direction 17. The connecting element 14 is coupled or connected to the master brake cylinder 2 in an interactive relationship, such that the master brake cylinder 2 can be actuated by moving the connecting element 14 in the first direction 17. Actuation of the master brake cylinder 2 in this case should be understood as movement of the hydraulic piston 13 in the first direction 17. When the component group 1 is properly installed in the brake system, hydraulic fluid is transferred from the master brake cylinder 2 into the slave cylinder of the wheel brake device.

[0025] The operating device 4 further comprises a power train device 19. The power train device 19 is interactively connected to the electric motor 9 so that the power train device 19 can be driven by the electric motor 9. The power train device 19 comprises a spindle transmission 20. The spindle transmission 20 comprises a spindle nut 21 and a threaded spindle 22. The spindle nut 21 is rotatably supported therein. The rotation axis 24 of the spindle nut 21 is oriented parallel to the directions 17 and 18. A detent 25 is assigned to the threaded spindle 22, which acts between the threaded spindle 22 and the housing 5. For this purpose, a detent element 26 is present, which is attached to the threaded spindle 22, in this case at the end of the threaded spindle 22 facing the coupling element 14 or the main brake cylinder 2. The anti-rotation element 26 cooperates with the housing 5 to form the detent 25. The internal teeth 27 of the spindle nut 21 mesh with the external teeth 28 of the threaded spindle 22, such that the threaded spindle 22 is movable by rotation of the spindle nut 21, i.e., selectively in the first direction 17 or the second direction 18. The threaded spindle 22 is coupled in an interactive relationship with the connecting element 14, such that the connecting element 14 is movable by movement of the threaded spindle 22 in the first direction 17. Here, a thrust body 29 is attached to the anti-rotation element 26. The thrust body 29 projects from the anti-rotation element 26 towards the connecting element 14, such that the thrust body 29 abuts the connecting element 14 in the axial direction with respect to the rotation axis 24 of the spindle nut 21.

[0026] The spindle nut 21 can be rotated by the electric motor 9. Correspondingly, the threaded spindle 22 can be moved by the electric motor 9. For this purpose, the gear mechanism device 19 here has a worm wheel 30, which radially surrounds the spindle nut 21. A radially inwardly oriented multi-tooth profile 31 of the worm wheel 30 meshes with a radially outwardly oriented multi-tooth profile 32 of the spindle nut 21. The gear mechanism device 19 further has a worm shaft 33 that can be rotated by the electric motor 9. The driven teeth of the worm shaft 33 mesh with the driving teeth of the worm wheel 30, so that the worm wheel 30, and therefore the spindle nut 21, can be rotated by rotation of the worm shaft 33.

[0027] The operating device 4 further includes a pressure piston 34 supported movably relative to the threaded spindle 22. The pressure piston 34 is movably supported in an axial through-hole 35 of the threaded spindle 22. A first end 36 of the pressure piston 34, remote from the main brake cylinder 2 or the connecting element 14, is interactively connected by a ball joint 37 to an input rod 38, such that the pressure piston 34 is movable by the input rod 38. The input rod 38, in turn, can be connected to or is connected to a brake pedal of the brake system. When the input rod 38 is connected to the brake pedal, the pressure piston 34 is movable by the brake pedal. A pressure cap 40 is attached to a second end 39 of the pressure piston 34 facing the connecting element 14. The pressure cap 40 projects into an axial through-hole 57 of the thrust body 29, so that an end face 58 of the pressure cap 40 can come into contact with the connecting element 14. The coupling element 14 can therefore also be moved by the movement of the pressure piston 34, so that the main brake cylinder 2 can be operated by the movement of the pressure piston 34. In the basic position of the actuating device 4 shown in Figure 2, the pressure cap 40 is axially spaced from the coupling element 14.

[0028] The connecting element 14 can be moved either by the electric motor 9 or by the brake pedal. When the connecting element 14 is moved by the electric motor 9, the electric motor 9 acts on the connecting element 14 by means of the power train 19, the anti-rotation element 26, and the thrust body 29. When the connecting element 14 is moved by the brake pedal, the brake pedal acts on the connecting element 14 by means of the input rod 38, the pressure piston 34, and the pressure cap 40.

[0029] The actuating device 4 further comprises a spring element 41. The spring element 41 is designed to exert a return force on the threaded spindle 22, which is movable by the electric motor 9, directed in the direction opposite to the actuation of the main brake cylinder 2. The return force acts on the threaded spindle 22 in the second direction 18 and pushes the threaded spindle 22 away from the main brake cylinder 2. The spring element 41 causes the threaded spindle 22 to return following actuation of the main brake cylinder 2. The spring element 41 is biased and held between the threaded spindle 22 and the spindle nut 21. Correspondingly, the spring element 41 exerts a force on the spindle nut 21 acting towards the main brake cylinder 2, i.e. in the first direction 17.

[0030] The actuating device 4 comprises a sleeve 42, which is arranged on a first end 43 of the threaded spindle 22, facing away from the main brake cylinder 2. The sleeve 42 is fitted over the threaded spindle 22 and rotatably supported thereon. For this purpose, a rotary bearing 45 with rolling elements 44 is present, which acts between the sleeve 42 and the threaded spindle 22. The sleeve 42 is axially secured on the threaded spindle 22 by a clip ring 46. The clip ring 46 is fitted over the threaded spindle 22 and radially engages in a circumferential groove 47 of the threaded spindle 22, which opens radially outward. A first end 48 of the spring element 41, which is assigned to the threaded spindle 22, is arranged in an axial stop 49 of the sleeve 42. The axial stop 49 is formed by a radial bulge 50 of the sleeve 42 that projects radially outward. The spring element 41 exerts a restoring force on the threaded spindle 22 or on a first end 43 of the threaded spindle 22 by means of the sleeve 42. Since the spring element 41 is not arranged directly on the threaded spindle 22 but on the sleeve 42, the threaded spindle 22 and the spring element 41 can rotate relative to one another. The rotation of the spindle nut 21 relative to the threaded spindle 22 is not hindered in this respect, or is hindered at most only slightly, by the presence of the spring element 41.

[0031] A second end 51 of the spring element 41, which is assigned to the spindle nut 21, is arranged on an axial stop 52 of the spindle nut 21 that is axially opposite the axial stop 49 of the sleeve 42. Because the axial stop 49 and the axial stop 52 are axially opposite, a cylindrically shaped spring element 41 can be used as the spring element 41. A cylindrically shaped spring element 41 is therefore particularly advantageous because it has a linear spring characteristic curve. In this case, the spring element 41 is configured as a coil spring 41.

[0032] The spindle nut 21 has a first axial section 53 facing the main brake cylinder 2 and a second axial section 54 facing away from the main brake cylinder 2. The first axial section 53 has internal teeth 27. The second axial section 54 is free of internal teeth 27. The second axial section 54 surrounds the spring element 41 at least in part. The previously mentioned radially outwardly oriented multi-tooth profile 32 is formed on both the first axial section 53 and the second axial section 54. Here, the multi-tooth profile 32 extends from the end of the spindle nut 21 facing the main brake cylinder 2 to the end of the spindle nut 21 facing away from the main brake cylinder 2.

[0033] The actuating device 4 further comprises a further spring element 55 which is biased and held between a return body 56 attached to the connecting element 14 and the main brake cylinder 2. Accordingly, the further spring element 55 exerts a return force acting in the second direction 18 on the connecting element 14 and thus on the threaded spindle 22 as well as on the pressure rod 34.

[0034] The function of the actuation device 4 is explained in more detail below. During fault-free operation of the electric motor 9, the electric motor 9 is controlled depending on the detected sliding position of the pressure piston 34. When the pressure piston 34 is moved in the first direction 17, the electric motor 9 is controlled so that the threaded spindle 22 is moved in the first direction 17 to actuate the main brake cylinder 2. The threaded spindle 22 is then moved in the first direction 17 against the restoring forces provided by the spring element 41 and the further spring element 55. Following actuation of the main brake cylinder 2, the threaded spindle 22 is returned by the restoring forces provided by the spring elements 41 and 55. The pressure piston 34 is only returned by the restoring force provided by the further spring element 55. The restoring force provided by the spring element 41, in contrast, does not act on the pressure piston 34. In the event of a failure of the electric motor 9, movement of the threaded spindle 22 in the first direction 17 by the electric motor 9 is not possible. The main brake cylinder 2 can still be operated by moving the pressure piston 34. To do this, the user only needs to overcome the restoring force provided by the additional spring element 55. When the connecting element 14 is moved in the first direction by the pressure rod 34, a force acting in the first direction 17 also acts on the threaded spindle 22 due to the mechanical interaction between the connecting element 14 and the threaded spindle 22. This force causes the threaded spindle 22 and the spindle nut 21 to move together with the pressure piston 34. Compression of the spring element 41 does not occur. Due to the dimensioning of the radially outwardly oriented multi-tooth profile 32 of the spindle nut 21, disengagement of the multi-tooth profiles 31 and 32 is prevented when the spindle nut 21 moves. During fault-free operation of the electric motor 9, movement of the spindle nut 21 is prevented by the reaction force acting between the multi-tooth profiles 31 and 32.

[0035] According to an alternative embodiment, instead of the threaded spindle 22, the spindle nut 21 is displaceable by the electric motor 9. A spring element 41 in this case exerts a restoring force on the spindle nut 21 acting in the second direction 18. [Explanation of symbols]

[0036] 1 constituent group 2 Main brake cylinder 3 Hydraulic Connections 4 Control device 5. Housing 6. Enclosure Wall 7 Inside the housing 8 Drive Unit 9 Electric Motor 10 Motor housing 11 Control device 12 first end face 13 Hydraulic piston 14 Connected Elements 15 Connected Disc 16 Connecting rod 17 First Direction 18 The Second Direction 19 Powertrain equipment 20 Spindle transmission mechanism 21 Spindle nut 22 threaded spindle 24 Rotation axis 25 Anti-rotation 26 Anti-rotation element 27 Inner teeth 28 Outer teeth 29 Thrust body 30 worm wheel 31 Multi-tooth profile 32 multi-tooth contour 33 Worm shaft 34 Pressure piston 35 Axial penetration 36 First end 37 Ball Joint 38 Input rod 39 Second end 40 Pressure Cap 41 Spring element 42 Sleeve 43 First end 44 rolling elements 45 Rotary bearing 46 Clip Ring 47 Circumferential groove 48 First end 49 Axial stopper 50 Radial extension 51 Second end 52 Axial stopper 53 First Axial Section 54 Second Axial Section 55 Alternative spring elements 56 Return body 57 Axial penetration 58 End face

Claims

1. an operating device (4) for a main brake cylinder, the operating device (4) comprising a transmission device (19) and an electric motor (9) driving the transmission device (19), the transmission device (19) having a spindle transmission (20) with a threaded spindle (22) and a spindle nut (21), the threaded spindle (22) or the spindle nut (21) being movable by the electric motor (9) for operating the main brake cylinder (2), the threaded spindle (22) movable by the electric motor (9) or the spindle nut (21) being movable by the electric motor (9) being assigned a spring element (41), the spring element (41) exerting a return force on the threaded spindle (22) or the spindle nut (21) directed in a direction opposite to the operation of the main brake cylinder (2); In the operating device, The spring element (41) is biased and held between the threaded spindle (22) and the spindle nut (21), the threaded spindle (22) and / or the spindle nut (21) are rotatable relative to the spring element (41); 1. An operating device for a main brake cylinder, comprising:

2. 2. The operating device according to claim 1, wherein the spring element (41) is cylindrically shaped.

3. 3. An operating device according to claim 1 or 2, characterized in that the spring element (41) is a coil spring (41).

4. the threaded spindle (22) has a first end (43) remote from the main brake cylinder (2); The spring element (41) exerts the return force on the first end (43) of the threaded spindle (22). The operating device according to claim 1 , wherein the operating device is a control panel.

5. a sleeve (42) disposed on the first end (43) of the threaded spindle (22), the sleeve (42) protruding axially beyond the first end (43) of the threaded spindle (22); a first end of the spring element (41) assigned to the threaded spindle (22) is arranged in an axial stop (49) of the sleeve (42); 5. The operating device according to claim 4, wherein:

6. 6. An operating device according to claim 5, characterized in that the sleeve (42) is rotatably supported on the threaded spindle (22).

7. 7. An operating device according to claim 6, characterized in that the sleeve (42) is axially secured on the threaded spindle (22) by a clip ring (46) fitted onto the threaded spindle (22).

8. 8. An operating device according to claim 5, wherein a second end (51) of the spring element (41) assigned to the spindle nut (21) is arranged on an axial stop (52) of the spindle nut (22) that is axially opposite to the axial stop (49) of the sleeve (42).

9. the spindle nut (22) has a first axial section (53) facing the main brake cylinder (2) and a second axial section (54) away from the main brake cylinder (2); said first axial section (53) having internal teeth (27) assigned to said threaded spindle (22); the second axial section (54) radially surrounds the spring element (41) at least in part of the section; 9. The operating device according to claim 1, wherein the operating device is a control panel.

10. 10. The operating device according to claim 1, wherein the operating device (4) comprises a pressurizing piston (34), the pressurizing piston (34) being movably supported in an axial through-portion (35) of the threaded spindle (22) and movable by an input rod (38), and the main brake cylinder (2) being operable by movement of the pressurizing piston (34).

11. 11. An actuating device according to claim 10, characterized by a further spring element (55) exerting a return force on the threaded spindle (22) and on the pressure piston (34) directed in a direction opposite to the actuation of the main brake cylinder (2).

12. 12. The operating device according to claim 11, wherein the threaded spindle (22) and the spindle nut (21) are mechanically connected to the pressure piston (34) in such a way that the threaded spindle (22) and the spindle nut (21) are movable together with the movement of the pressure piston (34) at least in the event of a failure of the electric motor (9).

13. 13. The operating device according to claim 1, wherein the power transmission mechanism device (19) comprises a worm wheel (30) that radially surrounds the spindle nut (21), and a radially inwardly oriented multi-tooth profile (31) of the worm wheel (30) meshes with a radially outwardly oriented multi-tooth profile (32) of the spindle nut (21).

14. 14. The operating device according to claim 13, characterized in that the multi-tooth profile (32) of the spindle nut (21) is formed in at least a partial section on the second axial section (54) of the spindle nut (21).

15. 15. A component for a hydraulic braking system, comprising an actuatable main brake cylinder (2) and an actuation device (4) for actuating the main brake cylinder (2), characterized in that the actuation device (4) is formed in accordance with one of claims 1 to 14.

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