WO2022207171A1 - Elektrische parkbremse sowie verfahren zur herstellung - Google Patents
Elektrische parkbremse sowie verfahren zur herstellung Download PDFInfo
- Publication number
- WO2022207171A1 WO2022207171A1 PCT/EP2022/053271 EP2022053271W WO2022207171A1 WO 2022207171 A1 WO2022207171 A1 WO 2022207171A1 EP 2022053271 W EP2022053271 W EP 2022053271W WO 2022207171 A1 WO2022207171 A1 WO 2022207171A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thread
- profile
- spindle
- external thread
- parking brake
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
- F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
- F16D65/183—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes with force-transmitting members arranged side by side acting on a spot type force-applying member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
- F16D2125/40—Screw-and-nut
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0023—Shaping by pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2075—Coaxial drive motors
Definitions
- the invention relates to an electric parking brake with a spindle drive that can be actuated electrically and is self-locking.
- the invention also relates to a method for producing such a parking brake.
- Electric parking brakes in general and with a spindle drive in particular are known from the prior art. These parking brakes are used in motor vehicles and are intended to prevent the motor vehicle from rolling when the parking brake is engaged. The electric parking brake is adjusted and preloaded into an engaged position via an electric motor using the spindle drive.
- spindle drives with a sawtooth-shaped thread are usually used for electric parking brakes.
- Sawtooth profiles are very well suited as a spindle drive in an electric parking brake, as they absorb the loads acting on one side very well and have a high degree of efficiency due to the steep load-bearing thread flanks.
- an electric parking brake is provided with a spindle drive that can be actuated electrically and is self-locking.
- the spindle drive comprises a spindle with an external thread or bolt thread and a spindle nut with an internal thread or nut thread which engages with the external thread.
- the external thread and the internal thread have a symmetrical thread profile. Furthermore, the profile flanks of adjacent profile peaks of the external thread merge directly into one another via a rounding in the intermediate profile valley.
- a symmetrical thread profile is understood to mean, in particular, a thread profile whose profile halves are mirror-symmetrical with respect to a central axis that extends radially through the profile tip in cross section.
- a spindle drive with a symmetrical thread profile instead of an asymmetrical thread profile has properties that meet the high demands placed on the spindle drive or the parking brake.
- the decisive factor here is that the profile valleys are rounded in order to be able to absorb the stresses introduced into the thread under load and thus to avoid thread breakage.
- the symmetrical thread profile with a completely rounded profile valley also has the advantage that, compared to an asymmetrical thread profile, it can be produced with little effort and more reliably with high quality by forming, in particular by rolling.
- the rounding of the profile valleys of the external thread can have a radius of between 0.18 mm and 0.22 mm, in particular 0.2 mm.
- the profile flanks of adjacent profile peaks of the internal thread can merge directly into one another via a rounding in the intervening Profi Ital.
- the rounding of the profile valleys of the internal thread has a radius of between 0.23 mm and 0.27 mm, in particular 0.25 mm.
- the external thread and the internal thread have a flank angle of between 26.5° and 29.5°, preferably between 27° and 29°, in particular 28°.
- This comparatively small flank angle ensures that the spindle drive can provide a high preload force.
- the thread with such a flank angle can be produced efficiently by means of forming processes.
- the external thread and the internal thread have a pitch of between 1.2 mm and 1.3 mm, in particular 1.25 mm.
- a higher clamping force can be achieved in comparison to the prior art with the same input torque by appropriate dimensioning of the thread while meeting the strength requirements.
- this slope offers a good compromise between a flat slope, which favors the self-locking of the spindle drive, and a steep slope, which increases the speed at which the spindle drive can be adjusted.
- the external thread can have a nominal diameter of between 8.3 mm and 8.4 mm, in particular 8.35 mm, as a result of which the spindle has a low mass with sufficiently high strength.
- the external thread has a
- the spindle is particularly compact and can be manufactured in a material-efficient manner.
- the external thread has a
- Flank diameter between 7.5 mm and 7.7 mm, preferably between 7.55 mm and 7.65 mm, particularly 7.6 mm.
- the internal thread has a flank diameter of between 7.7 mm and 7.9 mm, preferably between 7.75 mm and 7.85 mm, in particular 7.8 mm. A particularly high overlap can be ensured in this way.
- the profile valleys and profile peaks of the external thread and/or the internal thread can each have a width of between 0.62 mm and 0.63 mm, in particular 0.625 mm, at the level of the flank diameter. Such a width ensures high strength and thus reduces the risk of thread breakage under load.
- the external thread and/or the internal thread can have rounded profile tips.
- the threads can be produced cost-effectively, since rounded profile tips can be formed more easily during forming, in particular during rolling, and post-processing of the profile tips can therefore be dispensed with.
- a method for producing a parking brake according to the invention with the following step is also provided to solve the above-mentioned object:
- This process has the advantage that the thread diameter can be reduced by the end-rolled spindle and the high-strength spindle nut.
- spindle drives with differently manufactured spindles and spindle nuts showed particularly good functional properties.
- FIG. 1 in a partially sectioned representation of a caliper with a brake piston and an electric parking brake according to the invention, the has a spindle drive with a spindle and a spindle nut, with a section of a brake disc also being shown,
- FIG. 1 shows a brake caliper 10 of a disc brake of a vehicle, which interacts with a brake disc 12 .
- the caliper 10 includes a caliper body 14 to which a first brake pad 16 is attached.
- the first brake pad 16 is thus held immovably on the brake caliper body 14 .
- a second brake pad 18 is provided, which is slidably mounted on the brake caliper body 14 so that it can be selectively pressed against the brake disc 12 by means of a brake piston 20 in order to achieve a braking effect.
- the brake piston 20 is displaceable in a cylindrical opening, here z. B. a fluid cylinder 22 which is formed on the caliper body 14 is mounted.
- a pressure chamber 24 that can be acted upon by pressure fluid is delimited by an end of the fluid cylinder 22 that faces away from the brake disk 12 and by the brake piston 20 .
- the pressure chamber 24 is fluidically connected to a pressure fluid connection 26 via which a pressure fluid can be optionally introduced into the pressure chamber 24 and discharged from it.
- the pressure fluid is a hydraulic fluid.
- the fluid cylinder 22 is a hydraulic cylinder.
- the brake piston 20 can be moved hydraulically towards the brake pad 18 and the brake disc 12 so that the brake pad 18 is applied to the brake disc 12 and brakes it. Since the brake caliper 10 can be displaced in the direction of the longitudinal axis 32 of the piston according to the “floating caliper” principle, the brake lining 16 is also applied to the brake disc 12 in parallel.
- the brake piston 20 is coupled to an electric parking brake 100 which has a spindle drive 28 .
- the brake piston 20 with the functions described above and below can also be used in a purely electromechanical brake and is accommodated here in a cylindrical opening which can be designed as a bore or as the opening of a tubular cylinder.
- a spindle nut 30 of the spindle drive 28 is non-rotatably due to its non-circular outer contour, but is mounted on the brake piston 20 in an axially displaceable manner along a piston longitudinal axis 32 .
- the spindle nut 30 interacts with a spindle 34 of the spindle drive 28 , which is rotatable about the piston longitudinal axis 32 but is otherwise stationary on the brake caliper body 14 .
- the spindle 34 can be selectively set in rotation by means of an electric drive motor 36 .
- the brake piston 20 can also be moved towards the brake pad 18 and the brake disc 12 by means of the spindle drive 28, so that the brake pads 16 and 18 are pressed against the brake disc 12 and brake it.
- the brake piston 20 is shown in detail in FIG. 2 together with the spindle nut 30 and the spindle 34 .
- the brake piston 20 is essentially composed of a first tubular piston body section 38 and a second tubular piston body section 40 .
- Both piston body sections 38, 40 extend along the
- the second piston body section 40 is slightly conical with respect to the longitudinal axis 32 of the piston. Its cross-section decreases starting from from that end which is arranged adjacent to the spindle drive 28 in the direction of the end on the brake pad side.
- the second piston body section 40 is arranged radially completely inside the first piston body section 38 to form an annular cavity 42 in an axial view.
- the second piston body section 40 lies completely within the first piston body section 38 when the brake piston 20 is viewed along the longitudinal axis 32 of the piston.
- this embodiment is not to be understood as limiting.
- the second piston body section 40 optionally also lies axially completely within the first piston body section 38 . This means that the second piston body section 40 does not protrude axially beyond the first piston body section 38 . This applies to both axial ends of the second piston body section 40.
- the first piston body section 38 and the second piston body section 40 are connected to one another via an annular end wall section 44 .
- the annular end wall section 44 thus also delimits the cavity 42 in the axial direction.
- the second piston body section 40 is axially closed by a base section 46 at its end opposite the end wall section 44 along the piston longitudinal axis 32 .
- the bottom portion 46 is frusto-conical. However, it goes without saying that this can also be shaped differently, e.g. B. flat or conical.
- An inner peripheral surface 48 of the second piston body section 40 has an anti-twist contour 50 .
- the anti-twist contour 50 is formed in that the second piston body section has an octagonal cross section.
- the spindle nut 30, which represents a region of the spindle drive 28 that protrudes into the anti-twist contour 50, has a complementary cross-sectional geometry, ie it is also octagonal, for example. This means that the spindle nut 30 cannot be twisted relative to the brake piston 20 .
- the spindle nut 30 can be displaced along the piston longitudinal axis 32 within the second piston body section 40 .
- the inner peripheral surface 48 thus also forms an axial guide contour 52 for the spindle drive 28, more precisely for the spindle nut 30.
- the already mentioned taper of the second piston body section 40 is so small that the spindle nut 30 can be guided over the entire axial length by means of the guide contour 52 .
- a pressure surface 54 is positioned on an axial end of the first piston body section 38, which serves to be applied to the brake lining 18, ie to apply a force to it.
- the pressure surface 54 extends over the axial end face of the first piston body section 38 on the one hand and over an annular pressure surface extension 56 extending radially inwards from the end face.
- this is non-rotatably mechanical coupling means z. B. with the brake pad 18, usually with the so-called back plate of the brake pad 18 connected.
- a projection is provided on the brake piston 20 or on the back plate, which engages in a component made up of the brake piston 20 and the back plate on the other in order to effect a non-rotatable coupling.
- the brake piston 20 is also designed in such a way that the pressure surface 54 and an axially outer end surface 60 of the base section 46 lie essentially in a plane E (see FIG. 2).
- the brake piston 20 When the brake piston 20 is in operation, not only the pressure surface 54 but also the end surface 60 is in contact with the brake pad 18 . Furthermore, the brake piston 20 is frictionally connected to the brake caliper body 14 via a seal 62 .
- the spindle nut 30 has an internal thread 70 and the spindle 34 has an external thread 72 which engages with the internal thread 70 .
- the internal thread 70 and the external thread 72 are self-locking threads and each have a symmetrical thread profile 74, 76 (see FIGS. 3 and 4), the geometry of which is explained below with reference to FIGS.
- the internal thread 70 and the external thread 72 have a pitch of 1.25 mm.
- the pitch of the internal thread 70 and the external thread 72 is between 1.2 mm and 1.3 mm.
- FIG. 3 shows the external thread 72 of the spindle 34 with a nominal diameter DNA, a core diameter DKA, a flank diameter DFA and a diameter DA, from which the rounding of the thread crest begins.
- the nominal diameter DNA of the external thread 72 is 8.35 mm.
- the nominal diameter D N A of the external thread 72 is between 8.3 mm and 8.4 mm.
- the core diameter DKA of the external thread 72 is 6.45 mm.
- the core diameter D KA of the external thread 72 is between 6.35 mm and 6.55 mm, preferably between 6.4 mm and 6.5 mm.
- the flank diameter DFA of the external thread 72 is 7.6 mm.
- flank diameter DFA of the external thread 72 is between 7.5 mm and 7.7 mm, preferably between 7.55 mm and 7.65 mm.
- the diameter D A of the external thread 72 is at least 8 mm.
- the external thread 72 has a flank angle W A which is made up of the two partial angles W A and W 2A .
- the two partial angles Wi A and W 2A are equal, ie each of the partial angles Wi A and W 2A is half as large as the flank angle W A .
- the flank angle W A of the external thread 72 is 28°.
- flank angle W A of the external thread 72 is between 26.5° and 29.5°, preferably between 21 and 29°.
- the profile valleys 78 and profile peaks 80 of the external thread 72 each have a width B A of 0.625 mm at the level of the flank diameter D FA .
- the width B A is between 0.62 mm and 0.63 mm.
- the profile valleys 78 of the external thread 72 each have a rounding 82 which connects the profile flanks 84 of the profile peaks 80 adjacent to the profile italic 78 directly to one another.
- the profile valleys 78 are formed without straight profile sections.
- profile valleys 78 are designed without corners.
- the roundings 82 of the profile valleys 78 of the external thread 72 have a first radius R IA at the transition to one profile flank 84 and a second radius R 2A at the transition to the opposite profile flank 84.
- the radius R is IA and the radius is
- R 2A each 0.2mm.
- the profile italic 78 is preferably only formed by a radius, ie the opposite flanks transition into a valley which is formed exclusively by a radius, with which the radii R 1A and R 2A coincide.
- the radius R IA and/or the radius R 2A is between 0.18 mm and 0.22 mm, both radii being the same and can coincide as explained above.
- the crest of the thread 80 is rounded complementarily to the valley of the thread 78, ie the rounding has the same radius as the valley of the thread 78, although only one radius can be provided here, which merges directly into the flanks.
- FIG. 4 shows the internal thread 70 of the spindle nut 30 with a nominal diameter DNI, a core diameter DKI, a pitch diameter DFI and an inside diameter Di.
- the nominal diameter D N I of the internal thread 70 is 8.75 mm.
- the nominal diameter D N I of the internal thread 70 is between 8.7 mm and 8.8 mm.
- the core diameter DKI of the internal thread 70 is 6.85 mm.
- the core diameter DKI of the internal thread 70 is between 6.75 mm and 6.95 mm.
- the flank diameter DFI of the internal thread 70 is 7.8 mm.
- flank diameter DFI of the internal thread 70 is between 7.7 mm and 7.9 mm, preferably between 7.75 mm and 7.85 mm.
- the diameter Di of the internal thread 70, from which the rounding of the thread crest 88 begins, is at most 7.12 mm.
- the internal thread 70 has a flank angle Wi, which is made up of the two partial angles Wn and W21.
- the two partial angles Wn and W 21 are of equal size, ie each of the partial angles Wn and W 21 is half the size of the flank angle Wi.
- the flank angle Wi of the internal thread 70 is 28°.
- flank angle Wi of the internal thread 70 is between 26.5° and 29.5°, preferably between 27° and 29°.
- the profile peaks 86 and profile peaks 88 of the internal thread 70 each have a width Bi of 0.625 mm at the level of the flank diameter D FI .
- the width Bi is between 0.62 mm and 0.63 mm.
- the profile valleys 86 of the internal thread 70 each have a rounding 90 which connects the profile flanks 92 of the profile peaks 88 adjacent to the profile italic 86 directly to one another.
- the profile valleys 86 are formed without straight profile sections.
- profile valleys 86 are designed without corners.
- the roundings 90 of the profile valleys 86 of the internal thread 70 have a first radius Rn at the transition to one profile flank 92 and a second radius R21 at the transition to the opposite profile flank 92.
- the radius Rn and the radius R21 are each 0.25 mm, with both radii being able to coincide here, as with the external thread, so that the flanks merge directly into the same radius, so that the profile valley 86 is formed only by this singular radius.
- the radius Rn and/or the radius R 2 I is between 0.23 mm and 0.27 mm, both radii being the same here as well.
- the profile crests 80, 88 of the internal thread 70 and the external thread 72 are thus rounded, preferably with the same singular radius or the two radii Rn and R21 previously indicated.
- the spindle 34 is manufactured as follows.
- the mandrel 34 is heat treated to harden the mandrel
- the spindle 34 is rolled. After rolling, the spindle 34 is no longer heat treated, ie the last heat treatment before rolling was a final heat treatment.
- the spindle nut 30 can be manufactured as follows.
- the spindle nut 30 is rolled.
- the spindle nut 30 is heat-treated to harden the spindle nut 30.
- the spindle nut 30 is no longer rolled, i. H. the last rolling before the heat treatment was a final rolling, giving it particularly high strength.
- a spindle drive 28 which has a particularly small thread diameter due to its finish-rolled spindle 34 and high-strength spindle nut 30 .
- the special geometry of the internal thread 70 of the spindle nut 30 and the external thread 72 of the spindle 34 ensures that the spindle drive 28 can be produced reliably by forming such as rolling and thus with particularly little effort.
- the special geometry of the internal thread 70 of the spindle nut 30 and the external thread 72 of the spindle 34 ensures that the spindle drive 28 and thus the electric parking brake 100 meets particularly high requirements.
- Table 1 below shows several parameters for a thread type "thread A” and a thread type "thread B".
- the thread type "thread A” corresponds to an exemplary embodiment of the previously explained spindle drive 28 with the special geometry of the internal thread 70 of the spindle nut 30 and the external thread 72 of the spindle 34, while the thread type “thread B” describes a different spindle drive, which is a trapezoidal thread with a geometry based on DIN 103.
- DIN 103 provides for a pitch of at least 1.5 for a corresponding flank diameter, so that in the example the pitch was reduced by the to improve self-locking. Despite this optimization, the clamping force on thread A is significantly greater, which is the goal.
- the brake caliper 10 can be operated as follows.
- the brake piston 20 Starting from the position of the brake piston 20 shown in FIG. 1, it can be displaced to the left, for example by pressurizing the pressure chamber 24 , so that it is applied to the brake lining 18 and presses it against the brake disc 12 . This creates a braking effect.
- the spindle drive 28 is not actuated, i. H. the spindle nut 30 does not move.
- the brake piston 20 it is possible for the brake piston 20 to be displaced to the left, starting from the position shown in FIG. 1, by means of the spindle drive 28 of the electric parking brake 100.
- the electric drive motor 36 is activated and the spindle 34 is rotated.
- the spindle nut 30 After the spindle nut 30 has been mounted non-rotatably on the brake piston 20 via the anti-twist contour 50, this shifts the spindle nut 30 to the left. In doing so, it is guided by the guide contour 52 .
- the brake piston 20 is applied to the brake pad 18 which in turn is pressed against the brake disc 12 to provide braking as previously discussed.
- the brake piston 20 is frictionally held to the caliper body 14 by virtue of its frictional contact with the seal 62 such that it does not rotate.
- the electric parking brake 100 can be adjusted to an engaged state in which it presses the brake pad 18 via the spindle drive 28 with a clamping force of at least 16.5 kN onto the brake disc 12 and thus reliably places the vehicle in a parking or holding position holds.
- the electric parking brake 100 can be provided separately from or in combination with any brake of a vehicle, in particular with any brake caliper 10.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/552,932 US20240183411A1 (en) | 2021-03-30 | 2022-02-10 | Electric parking brake and method for production thereof |
EP22709236.8A EP4314597A1 (de) | 2021-03-30 | 2022-02-10 | Elektrische parkbremse sowie verfahren zur herstellung |
CN202280025612.9A CN117098934A (zh) | 2021-03-30 | 2022-02-10 | 电动驻车制动器及其生产方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021108111.4 | 2021-03-30 | ||
DE102021108111.4A DE102021108111A1 (de) | 2021-03-30 | 2021-03-30 | Elektrische Parkbremse sowie Verfahren zur Herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022207171A1 true WO2022207171A1 (de) | 2022-10-06 |
Family
ID=80685520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/053271 WO2022207171A1 (de) | 2021-03-30 | 2022-02-10 | Elektrische parkbremse sowie verfahren zur herstellung |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240183411A1 (de) |
EP (1) | EP4314597A1 (de) |
CN (1) | CN117098934A (de) |
DE (1) | DE102021108111A1 (de) |
WO (1) | WO2022207171A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006018348U1 (de) * | 2006-12-01 | 2008-01-03 | EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Gewindelehre |
DE102006045187A1 (de) * | 2006-08-31 | 2008-03-20 | Mehrhof, Jürgen | Verbundsystem für ein zweiteiliges Zahnimplantat |
EP3263415A1 (de) * | 2016-06-28 | 2018-01-03 | Akebono Brake Industry Co., Ltd. | Mechanismus mit linearbewegung |
US20190118789A1 (en) * | 2016-04-04 | 2019-04-25 | Foundation Brakes France | Electromagnetic brake calliper comprising a reduced friction piston guide |
DE102018216509A1 (de) * | 2018-09-26 | 2020-03-26 | Continental Teves Ag & Co. Ohg | Elektrischer Radbremsaktuator mit verbesserter Endlagenerkennung |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1154782B (de) | 1958-06-09 | 1963-09-26 | Elastic Stop Nut Corp | Verfahren zum Walzen eines Gewindes mit hoher Dauerfestigkeit |
DE19835550A1 (de) | 1998-08-06 | 2000-02-10 | Continental Teves Ag & Co Ohg | Kombisattel mit elektrischer Nach- und Feststellung |
DE10163144B4 (de) | 2001-12-20 | 2008-04-24 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Feststellbremsvorrichtung und Steuerverfahren |
KR102238238B1 (ko) | 2014-04-07 | 2021-04-09 | 이구스 게엠베하 | 비대칭적인 내부 나사부와 외부 나사부를 갖는 리드 스크류 드라이브 및 대응하는 스핀들 너트 |
-
2021
- 2021-03-30 DE DE102021108111.4A patent/DE102021108111A1/de active Pending
-
2022
- 2022-02-10 US US18/552,932 patent/US20240183411A1/en active Pending
- 2022-02-10 WO PCT/EP2022/053271 patent/WO2022207171A1/de active Application Filing
- 2022-02-10 CN CN202280025612.9A patent/CN117098934A/zh active Pending
- 2022-02-10 EP EP22709236.8A patent/EP4314597A1/de active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006045187A1 (de) * | 2006-08-31 | 2008-03-20 | Mehrhof, Jürgen | Verbundsystem für ein zweiteiliges Zahnimplantat |
DE202006018348U1 (de) * | 2006-12-01 | 2008-01-03 | EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Gewindelehre |
US20190118789A1 (en) * | 2016-04-04 | 2019-04-25 | Foundation Brakes France | Electromagnetic brake calliper comprising a reduced friction piston guide |
EP3263415A1 (de) * | 2016-06-28 | 2018-01-03 | Akebono Brake Industry Co., Ltd. | Mechanismus mit linearbewegung |
DE102018216509A1 (de) * | 2018-09-26 | 2020-03-26 | Continental Teves Ag & Co. Ohg | Elektrischer Radbremsaktuator mit verbesserter Endlagenerkennung |
Also Published As
Publication number | Publication date |
---|---|
CN117098934A (zh) | 2023-11-21 |
US20240183411A1 (en) | 2024-06-06 |
DE102021108111A1 (de) | 2022-10-06 |
EP4314597A1 (de) | 2024-02-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2066468B1 (de) | Verfahren und vorrichtung zur oberflächenverdichtung eines sinterteils | |
EP2127777B1 (de) | Vorrichtung und Verfahren zum Herstellen oder Bearbeiten von Werkstücken aus einer Vorform, insbesondere zum Anformen von Innenprofilen oder Innenverzahnungen | |
EP2490834B1 (de) | Wälzgewindetrieb mit einer spindel und verwendung des wälzgewindetriebs | |
EP3350039B1 (de) | Bremskraftverstärker und bremseinrichtung mit einem derartigen bremskraftverstärker | |
WO1990011458A1 (de) | Loch- und gewindeformende schraube | |
EP2641673B1 (de) | Verfahren und Vorrichtung zur Herstellung eines Verbindungsabschnitts als Teil eines Werkzeugs | |
WO2011020539A1 (de) | Verfahren zur herstellung eines einen abschnitt einer lenkspindel bildenden lenkspindelteils | |
DE69502119T2 (de) | Verfahren zur Herstellung von vorgespannten Kugelumlaufspindeln | |
EP2790849B1 (de) | Planet für einen planetenwälzgewindetrieb | |
EP3208164A1 (de) | Kugelgewindetrieb | |
EP2049276B1 (de) | Vorrichtung und verfahren zum umformen eines werkstücks | |
WO2022207171A1 (de) | Elektrische parkbremse sowie verfahren zur herstellung | |
EP0504782A1 (de) | Schraube, Verfahren und Walzbacken zu ihrer Herstellung | |
WO2014131617A1 (de) | Herstellungsverfahren für schrauben und betonschraube | |
EP3822507B1 (de) | Betätigungseinheit für eine elektrische parkbremse | |
EP3964726B1 (de) | Steckverzahnung und verfahren zur herstellung eines achszapfens einer steckverzahnung | |
DE102009005336A1 (de) | Schraubenelement, Schraubverbindung sowie Verfahren zum Herstellen eines Schraubenelementes | |
EP2581209A1 (de) | Vorrichtung zum Betreiben eines Presskolbens | |
EP0941783B1 (de) | Verfahren zur Herstellung eines einteiligen Achskörpers | |
WO2016131456A1 (de) | Planetenwälzgetriebe sowie verfahren zur herstellung dieses planetenwälzgetriebes | |
WO2012038343A1 (de) | Verfahren zum herstellen eines bohrers | |
EP2254714B1 (de) | Verfahren zum herstellen eines innengewindeelementes, innengewindeelement sowie schraubverbindung | |
DE102006037091B3 (de) | Vorrichtung und Verfahren zum Umformen eines Werkstücks | |
WO2004094083A2 (de) | Verfahren zur herstellung eines napfförmigen ringteiles mit innenverzahnung, napfförmige vorform und napfförmiges ringteil | |
DE202006012170U1 (de) | Vorrichtung zum Umformen, insbesondere zum Kaltverformen, von Werkstücken |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22709236 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280025612.9 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18552932 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022709236 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2022709236 Country of ref document: EP Effective date: 20231030 |