WO2013149777A1

WO2013149777A1 - Brake calliper actuatable in a combined manner

Info

Publication number: WO2013149777A1
Application number: PCT/EP2013/054368
Authority: WO
Inventors: Klaus Barabasch; Sebastian Salzmann; Ralph Petri; Götz Mehner
Original assignee: Continental Teves Ag & Co. Ohg
Priority date: 2012-04-04
Filing date: 2013-03-05
Publication date: 2013-10-10
Also published as: DE102012223138A1

Abstract

A brake calliper (1) for a motor vehicle disc brake actuatable in a combined manner comprises a housing (2), wherein a piston (7) is displaceably arranged in a piston bore (8) in a guided manner and is impinged upon by gear means having at least one ball ramp device (11, 13), said ball ramp device comprising at least one output gear component (12) received in the housing so as to be secured against rotation and a driving gear component (9) rotatable relative to said output gear component in order to enable parking brake actuation with the aid of a rotary driving rotational movement. In order to form an anti-rotation safeguard (18), the housing (2) has at least one circular segment-shaped recess (19) on the periphery of the piston bore (8), pointing radially outward starting from the periphery, said recess being arranged parallel-prismatically relative to the piston bore (8) and thereby forming a recess (19) for axially guided reception of at least one cam (20).

Description

Combined actuated caliper

The invention relates to a combined actuated brake ^¬ saddle comprising a housing having a bore in which a piston is guided axially displaceably guided as ^¬ actuator. The piston is usually hydraulically actuated by means of pressure medium for service braking and for parking braking by a rotationally driven shaft. It is pos ^¬ lich that both service braking and parking brake operations are performed by electromechanical actuators. Gear means and anti-rotation means serve to convert a rotary drive rotary motion into a translational output motion from the actuator.

EP 403 635 B1 describes a combined actuated brake caliper of a motor vehicle disc brake. The known caliper comprises a housing, wherein a piston is arranged axially ver ^¬ slidably guided in a piston bore, and is acted upon by transmission means with at least one ball ramp device. The ball ramp device comprises a rotatable and axially displaceably mounted in the housing drive transmission component with an actuating shaft and a ball ramp assembly, which is supported on a non-rotatably and axially immovably mounted in the housing counterpart. To form a bundled preassembly assembly (insert) a common fastening element is additionally provided, so that the assembly formed as a whole can be inserted into the piston bore. An essential component of this assembly is the counterpart of the ball ^¬ ramp assembly formed as a perforated plate, and secured against rotation in relation to the housing, at a bottom of Housing is added. As a result, the entire pre-assembly ^{¬ is taken} against rotation in the housing, and peripheral forces are introduced from the assembly on the plate in the ground.

It is an object of the present invention, produced a combined brake caliper operable easier with less expensive and large ^¬ series technically and smoothly mountable gear means including Verdrehsicherung- smitteln provide.

The object is achieved by the combination of the features of the main claim by at least one in the housing against rotation and axially displaceable mounted output ^¬ transmission component and a rotatable relative to the housing and axially non-displaceably mounted drive transmission component is provided, and wherein the housing, to form the

Anti-rotation, radially outwardly pointing from the circumference of the piston bore, at least one circular segment-shaped Ausneh ^¬ tion has, which is arranged parallel to the piston bore prismatic, and at least one radially outwardly facing cam directly or indirectly from the non-rotatably mounted output gear component formschlüs ^¬ sig in the Recess engages.

A particular advantage of the invention is the surprising effect that the transmission means despite Eliminie ^¬ tion of an additional component (cartridge, Befestigungsele ^¬ ment) have increased resistance to overloading. With improved power flow increased radio ^¬ tion security is created. Inner wear is avoided the. In a particularly favorable production of the subassembly, the fatigue strength is increased according to the invention.

Further advantageous embodiments of the invention will become apparent from dependent claims together with the description with reference to the drawings.

In the drawing, the invention is shown by way of example with reference to several embodiments. Showing:

1 shows an inventive, combined actuated caliper on a larger scale and in longitudinal section,

2a shows the detail IIa in Fig. 1 in plan view along the axis A, partially cut and enlarged,

Fig. 2b longitudinal section through a correct position and

secured against rotation in the housing

Output transmission component

Fig. 3 shows the arrangement of FIG. 2b partially in perspective and in section

Fig. 4a, b exploded view of transmission components in Fig. 1, each offset by 180 °,

Fig. 5 exploded view of transmission components according to a second embodiment with odd number of cams, and

Fig. 6 shows the embodiment as in Fig. 5 in 180 ° rotated exploded view. A caliper 1 of Faustseltype used to generate application forces and has a housing 2, which has a leg 3, a bridge section 4 and so-called fist ^¬ finger 5. Usually, the housing consists Since ^¬ at engages over the bridge portion 4 a brake disc 6. The actuator 7 - in particular piston - is axially displaceable in an axially directed, and at least partly stepped manufactured arranged piston bore 8 and actuates a brake pad directly. For this, the brake ^lining is pressed against a friction surface of the brake disc. The brake pads are arranged on both sides of the brake disc. A vehicle-mounted holder receives the brake pads so that tangentially directed brake circumferential forces can be introduced into the vehicle. The housing 2 is arranged with its leg 3 axially displaceably guided on the vehicle-fixed holder to act by reaction force indirectly actuated brake pad against the friction surface of the brake disc 6, and thereby apply the clamping forces.

In the combined actuated calipers the actuating element two independent Betätigungsvor ^¬ directions - according to the respective legislation - assigned, so that regardless of the hydraulic actuation (service brake actuations) nor a mechanical actuation (parking brake actuation) by an actuator, in particular by an electric motor drive or Operating lever, is possible, and vice versa.

Gear means comprise at least one axially on the housing 2 fixed and rotatably mounted relative to the housing 2 on ^¬ transmission gearbox 9. This rotationally driven GE drive component has a drive shaft 10 and a synchronous drehdrehbare ball ramp device 11. For red-trans conversion, the transmission means further have an associated and non-rotatably mounted on the housing 2, and translationally displaceable, output gear member 12 with a ball ramp device 13, which the actuating element 7 (piston ) actuated indirectly by means of a so-called Ver ^¬ wear-adjusting device. For this purpose, the driven gear component 12 has a threaded spindle 15, which meshes with a threaded nut 16, which is axially elastically biased by a friction cone 17 to form a coupling on a conical counterpart of the actuating element 7 (piston).

The output gear member 12 is at least one

Anti-rotation 18 assigned to the

Output gear component 12 rotatably coupled to the housing 2. The anti-rotation device 18 is equipped with an integrated guide function, the

Output gearbox component 12 by the way the necessary

translational displacement enabled. For this purpose, pre ^¬ see that facing the periphery of the piston bore 8 radially outward, at least one circular segment shaped recess 19 is provided, which is arranged parallel to the piston bore 8 thus channel-like prismatic. The axially displaceable and non-rotatably received output gear component 12 has an adapted, radially outwardly facing, cam 20. The cam 20 engages positively in the circular segment-shaped recess 19. Between the surface of the recess 19 and the cam 20 is in the radial direction at least selective contact. This gives the

Anti-rotation function additionally a supporting guide tion function for the translatory displacement.

In a further advantageous embodiment of the invention, it is provided that the non-rotatably mounted

Output gear component 12 is integrally formed with the threaded spindle 15, and with one or more cams 20, and with a plurality of ball ramp contours. A irr ^¬ moderate number of several anti-rotation devices 18, 18 ', 18''is particularly suited for housing 2, which are made of an aluminum material ^¬. Because compressive stresses are ^¬ initiated advantageous distributed in the housing 2.

The geometry data from the circle segment are advantageously chosen in this context so that the circle segment has ei ^¬ nen smaller radius r, as the radius R of Kol ^¬ benbohrung. A circle center M of the circle segment is in the radial direction Ra between

Bore center axis / piston center axis A and a circumference of the piston bore provided. Therefore, the area of the circular segment is always dimensioned substantially smaller than the area of the piston bore. Incidentally, the radius RB is provided stepped such that it is smaller than the radius R of the piston bore.

For stress-appropriate design, the angular positioning of the circular segment-shaped recess 19,19 'is advantageously arranged in the range of a mechanically very stiff dimensioned bridge section 4 of the housing 2. This positioning is also referred to as the 12 o'clock position in the broader context. Radially diametrically opposite the bridge section is a so-called 6 o'clock position, which advantageously also has a guide with a circular segment. The 6 o'clock position is diejeni ^¬ ge position on the circumference of the piston bore, which, viewed in radial direction has the smallest distance to a rotation axis Ax of the brake disc. 6 The geometry data of this circle segment coincide advantageously with the Geo ^¬ metriedaten the circular segment in the 12 o'clock position. Characterized the guide and Verdrehsicherungsfunktion is advantageous on a plurality of substantially coincident formed, preferably diametrically opposed, No ^¬ CKEN 20 and recesses 19 distributed.

For a further uniform distribution of forces, it is possible in principle to increase the number of anti-rotation devices 18, 18 ', 18''. Particularly preferred is an odd number of anti-rotation 18, 18 ', 18''on the circumference of the piston bore 8 is provided. All anti-rotation locks 18 are each arranged at a regular distance from one another at the circumference of the piston bore 8 at a regular angle. Two or more anti-rotation 18, 18 ', 18''allow a particularly favorable force for certain material pairings, for example, if the output gear member 12 is formed of fes ^¬ tem material such as steel, so that the cams in a housing 2 made of ductile material, such as ^¬ example in aluminum material, is included.

The contour of each cam 20 has at least one ge ^¬ curved portion 21, which is nestled arc to the arc contour of the receiving segment of a circle in order to avoid deformation or clamping. For the purpose of a manufacturing times, each curved portion 21 of a cam to a radius rl, which largely coincides with the radius r of the circle segment. In a further development of the invention can be provided as an involute for a simplified machining Herstel ^{¬ development of} the cam 20 whose edge. Furthermore, it is useful to avoid deformation that between a head of each cam 20 and a Bo ^¬ the each recess a clearance 22 is formed. In the preferred embodiment, this clearance 22 is also formed circular segment-shaped, in that the head of the cam 20 is flattened thus formed flat. The space 22 thus allows a certain amount of space in the radial direction, so that too narrow tolerance can be avoided. A further advantageous measure to improve the carrying capacity ^¬ is that several anti-rotation devices 18, 18 ', 18''with play are tolerated each other. As a result, a particularly uniform load distribution between the individual anti-rotation locks 18, 18 ', 18''is achieved.

To improve the production by means of non-cutting cold-forming process is provided, starting from the piston bore axis Ax, in the radial direction Ra at least one cam 20 is arranged in alignment with at least one recess of a ball ^¬ rampenkontur. It is thereby made possible a simplified non-cutting cold massive deformation, because the displaced material volume for depression of the ball ramp contour can be displaced radially outward to the formation of the cam 20. As a result, the Kaltar ^¬ beitsvermögen of the material is advantageously exploited. It is understood that the remaining anti-rotation devices

18, 18 ', 18''can be provided according to the same pattern, without departing from the invention. The assembly of the components in the piston bore 8 is as follows. A radially effective bearing bush 23 is inserted into a ^{circumferential area of} a through-bore 24 from the bottom 25. The bushing 23 receives the drive shaft 10 from Antriebsge ^¬ drive component 9 rotatably. Thereafter, a thrust bearing 26 is introduced to the housing side, axially directed support of the drive gear member 9 through the piston bore 8 through, and placed on the bottom 25 of the piston bore 8 ^¬ . Thereafter, the rotatable drive gear member 9 is inserted with its shaft 10 in the through hole 24.

Subsequently, rolling elements are placed on the trough-shaped contour of the ball ramp device 13. This is preferably done on the basis of a Wälzkörperring which receives the rolling elements at regular intervals from each other and holds. Furthermore, the actuating element 7 forms a preassembly assembly, which comprises the actuating element 7, a threaded nut 16, a thrust bearing 27 and at least one spring element 28 which is provided between a projection of the Betätigunselement 7 and the thrust bearing 27 elastically clamped. The pre-assembly is inserted into the housing, and the Ge ^¬ windemutter 16 is screwed onto the output gear component 15 ^¬ . Thereafter, a pre-installed on the actuator 7 (Kol ^¬ ben), ie preassembled and separately hand ^¬ habitable assembly with the output gear component 12 is inserted into the piston bore 8. So the involved construction ^¬ groups ranging from the friction cone 17 split are provided. The integrated sub-assembly in the actuating element (piston) 7 is provided with the aid of a spring element 30 elastically biased in the axial ^¬ direction Ax on the ball ramp device 11 from the drive gear component 9. In this case, the Fe ^¬ derelement 30 between a head of Output gear component 12 and the spring cup 29 is clamped ^¬ . For elastically prestressed mounting of the spring element 30, the spring cup 29 is supported directly or indirectly on the housing 2. The support is preferably carried out with ^¬ telbar by means of a separate fastening element (clamping ring) 31, which engages positively in a recess on the Ge ^¬ housing. 2

Reference sign list

1 caliper

2 housings

3 thighs

4 bridge section

5 fist fingers

6 brake disc

7 actuator

8 piston bore

9 drive transmission component

10 drive shaft

11 ball ramp device (drive side)

12 output gear component

13 ball ramp device (output side)

14 Wear Adjustment Device

15 threaded spindle

16 threaded nut

17 friction cone

18 anti-rotation lock

19, 19 ', 19' 'recess

20, 20 '20' 'cam

21 curved section

22 free space

23 bushing

24 through hole

25 floor

26 thrust bearings

27 thrust bearings

28 spring element

29 spring pot

30 spring element 31 fastener

A axis piston bore

rl radius curved section r radius circle segment

R radius piston bore

RB radius

Ra radial direction

Ax Axial direction (axis of rotation Bremssche

Claims

Claims:

Combined operable brake caliper (1) of a motor vehicle disc brake, comprising a housing (2), wherein a Betätigungslemement (7), in particular hydraulic piston, axially displaceably guided in a piston bore (8) is arranged, and of transmission means with at least one Ku ^¬ gelrampenvorrichtung (11,13) is acted upon, which ball ^¬ ramp mechanism (11,13) at least one in the housing (2) against rotation and axially displaceably mounted power take-off ^¬ transmission component (12) and a relative to the housing (2) rotatable and axially non-displaceably mounted Antriebge ^¬ drive component (9) comprises, to produce a translational Fest ^¬ parking brake operation by means of a rotary drive rotary motion, and wherein the housing (2), for forming the rotation (18), from the circumference of the piston bore (8) radially pointing outside, at least one circular segment-shaped recess (19), the prismatic angeo parallel to the piston bore (8) rdnet, and wherein at least one radially outwardly pointing cam (20) engages with ^¬ immediacy or directly starting from the non-rotatably mounted output gear component (12) in a form-fitting manner in the recess (19).

2. Combined actuated brake caliper (1) according to claim 1, characterized in that the rotationally mounted output gear component (12) with the cam (20) is arranged axially ver ^¬ slidably guided in the circular segment-shaped recess (19), and that the rotatably mounted to ^¬ transmission gear component (9) in the axial direction Ax on the housing (2) is firmly supported.

3. Combined actuated brake caliper (1) according to claim 1, characterized in that the output gear component (12) is provided integrally with a threaded spindle (15), with a plurality of cams (20) and with a plurality of ball ramp recesses.

4. Combined actuated brake caliper (1) according to claim 1, characterized in that the circular segment-shaped Ausneh ^¬ tion (19) has a radius r, which is smaller than a radius ^¬ us R of the piston bore (8).

5. Combined operable brake caliper (1) according to claim 1, characterized in that a circular center M of the circular segment-shaped recess (19) in the radial direction Ra between the piston center axis A and the circumference of the piston bore (8) is provided.

6. Combined actuated brake caliper (1) according to claim 1, characterized in that a circular segment-shaped recess ^¬ (19) in the region of a bridge portion (4) of the housing (2) is provided (12 o'clock position).

7. Combined actuated brake caliper (1) according to claim 6, characterized in that a circular segment-shaped Aus (19) in 6 o'clock position, diametrically opposite the circular segment in the 12 o'clock position, is provided.

8. Combined actuated brake caliper (1) according to claim 1, characterized in that an odd number of multiple anti-rotation (18, 18 ', 18' ') at the periphery of the piston bore (8) are provided offset from one another at regular intervals.

9. Combined actuated brake caliper (1) according to claim 1, characterized in that each cam (20) at least ei ^¬ nen curved portion (21) which is nestled against the circular-segment-shaped recess (19).

10. Combined actuated brake caliper (1) according to claim 9, characterized in that each curved portion (21) of a cam (20) has a radius rl, which coincides with the radius r of the circular segment-shaped recess (19).

Combined operable caliper (1) according to claim 1, characterized in that between a head of each cam (20, 20 ', 20'') and a bottom of each recess (19, 19', 19 '') a clearance (22 ) is provided.

12. Combined actuated brake caliper (1) according to claim 11, characterized in that the free space (22) is formed kreisseg- ment-shaped by the head of the cam

(20, 20 ', 20' ') is flat.

Combined operable brake caliper (1) according to claim 1, characterized in that at least two

Verdrehsicherungen (18, 18 ', 18' ') are tolerated to each other with play such that a uniform, clamping force-free load distribution between the anti-rotation (18, 18', 18 '') is present.

14. Combined actuated brake caliper (1) according to claim 8 or 13, characterized in that in the radial direction Ra, starting from the piston axis A, at least one cam (20) with at least one trough of the ball ramp device

(11,13) is arranged in alignment.

15. Combined actuated brake caliper (1) according to claim 1, characterized in that a threaded nut (16) together sam ^{¬ together} with a thrust bearing (27) and at least one spring element (28) arranged on the actuating element (7) arranged, and separate subassembly forms, and wherein the threaded nut (16) is screwed to the driven gear ^¬ ge ^¬ , and wherein a spring element (29) between Ge ^¬ housing (2) and output gear component (12) is so elastically ^¬ stretched that the output gear component (12) axially in the direction of the ball ramp device (11) is biased by the drive gear component (9).