DE4025222A1 - Part-lined disc brake - has brake block pressing radially against drum surface connected to brake disc - Google Patents

Abstract

The part-lined disc brake has a brake housing fixed against rotation and engaging round the radially outer edge of the brake disc and provided with two brake blocks which are mounted axially displaceable on each side of the disc. The brake disc or brake rotor (2) has radially inside or outside the brake blocks (4,6) at least one circumferential projection or area (12) which extends axially away from the disc face and has a cylindrical or conical secondary friction face (11) which faces the brake block (4,6). At least one brake block is provided on its narrow side facing the said secondary friction face (10) with a friction lining. The mechanical operating mechanism can move the brake block radially so that this presses with its narrow side against the said secondary friction surface. USE/ADVANTAGE - Vehicle disc brake with reduced wear on the friction lining.

Description

The invention relates to a partial brake disc brake, especially for motor vehicles, where a hydraulic Operated service brake with a mechanically operated Parking brake is combined in a brake housing.

There are already numerous disc brakes according to the Preamble of claim 1 known, see for example, Brake Manual, Bartsch-Verlag, Ottobrunn bei Munich, 9th edition, pages 145f, 175f, 177f, 187f, 212ff. They all have the common feature that to operate the Parking brake a mechanical actuator is provided, the at least one brake pad in the axial Direction presses against the brake disc. The hydraulic Actuator is designed so that despite the wear of the brake pads always a constant The air gap between the friction lining and the brake disc is maintained becomes. With increasing wear of the friction linings therefore move the brake pad pads keep getting in Towards the brake disc. From the mechanical Actuator operating on at least one Pad holding plate acts, it is required that the Actuation required path with increasing wear of the Friction linings not extended. For this reason, the mechanical actuator with an automatic  Adjustment device provided for the also numerous Embodiments are known, for example from the DE-OS 35 32 987 A1.

Mainly because of the automatic adjustment device Known devices constructed complicated. To their Realization requires a lot of individual parts. This increases the weight of the brake and especially the Manufacturing costs increased. Because of the complicated structure there are always functional problems. For example the release behavior of the brake pads is impaired, leading to increased lining wear or the brake jams during mechanical actuation, so that they are no longer released can be. In addition, known devices are in the generally very susceptible to corrosion.

The resulting object of the invention is in being a mechanical actuator for Part brake disc brakes specify which consist of a few parts consists of simple construction, cheap to manufacture and is reliable in operation.

The solution to the problem arises from the characterizing part of claim 1 and consists in Principle in the mechanical actuation of the Parking brake one or both brake pads in radial To press against the brake disc instead of axially Direction as with the hydraulic actuation of the Service brake. Because the directions mentioned are perpendicular stand on each other, are service and parking brake  decoupled with regard to their clamping forces.

Slight modifications are required to implement the solution the brake disc and at least one of the brake pads. So the brake disc must be near a brake pad have circumferential auxiliary friction surface on the one narrow side of the brake pad can be pressed in the radial direction and the brake block must be on this narrow side with a Be provided with friction lining. Because this friction lining only used in the mechanical brake actuation is, its wear is so low that on one automatic adjustment device can be dispensed with. Therefore, the mechanical actuator can be very simple and made up of a few parts.

The resulting benefits are minor Weight, lower manufacturing costs and higher Operational safety of the brake. In addition, when replacing worn brake pads no resetting automatic adjustment device is necessary. So at Maintenance work related errors avoided and the Maintenance costs reduced.

In a preferred embodiment of the invention Brake according to claim 2 is provided, the brake pad itself to lead radially movable relative to the brake housing, so that he has mechanical actuators against one Auxiliary friction surface of the brake disc can be pressed. In the particularly simple implementation of the movable guide according to claim 3, the brake pad at two in  Circumferential direction of the brake disc protruding ears by means of two bolts attached to the brake housing. There is a bolt in turn rotatably mounted in the brake housing and with a Eccentric so that when turning this bolt the Brake block pivots around the other bolt executes. The rotatable bolt is also the guide of the Brake pad and part of the mechanical Actuator. To complete this, this Bolts only through the brake housing to the outside extended and provided with an operating lever. With appropriate dimensioning, the mentioned guide can also those that occur when the service brake is actuated Take up circumferential forces, so that further support of the brake pad can be dispensed with.

In another embodiment of the invention according to claim 4, the entire brake housing is guided in a radially movable manner. Here can the mechanical actuator outside of Housing attached and the internal structure of a simple Service brake can be taken over essentially unchanged. This fact has an advantageous effect on the Production costs from, as already existing facilities for series production of brakes to convert to Combined brake according to the invention only slightly would have to be modified.

The invention is particularly easy and inexpensive a partial brake disc brake with integrated floating caliper realize. With this brake the floating caliper is by means of two bolts attached to the vehicle's suspension  are anchored, axially movable. One of the anyway existing bolt or one of the bolt guides will now according to claim 5 only provided with an eccentric is connected to an operating lever. Because with one integrated floating caliper disc brake one of the bolts is dimensioned more strongly than the other, one is according to Claim 6 preferably with the weaker guide pin the mechanical actuator to this to be able to perform material and space-saving. To Realization of the actuation device is needed in Principle only three parts: a guide pin with oval Cross section, with a cylindrical guide sleeve eccentric inner bore and an attached Actuating lever for turning the sleeve. If need be according to claim 7, the brackets of the brake pads reinforced so that the radial clamping forces when actuated the parking brake.

A brake pad for the brake according to the invention is advantageously designed so that according to claim 8 Friction lining the pad holding plate on its to actuate the Parking brake to be pressed against the brake disc Overhanging the narrow side or that according to claim 9 Base plate on the side mentioned an angled Has section which is provided with a friction lining. In a Further development of the brake pad is that for pressing against the Auxiliary friction surface of the brake disc certain area of the The shape of the friction lining on its narrow side adapted to the auxiliary friction surface, in particular in Circumferentially curved. This ensures  that the friction lining with the parking brake is as large as possible on the brake disc and the clamping force is distributed evenly over the surface.

A preferred embodiment of an inventive Brake rotor according to claim 11 is based on a known Brake rotor for disc brakes, the central cup-shaped Radially outward area in a brake disc ring transforms. This brake rotor points in its central area already an extending in the axial direction and surrounding outer surface. A brake rotor according to the invention is simply done by grinding an auxiliary friction surface on the outer surface of an above-mentioned brake rotor produced.

The invention is further improved if according to claim 12 the auxiliary friction surface of the brake rotor is conical and the cone diameter in the direction of the brake disc ring increases. The special description section explains that a kind of automatic re-adjustment by means of this measure reached the parking brake and even the very low one Wear of the friction lining is compensated for at this point.

Exemplary embodiments of the invention are described below the drawings explained. Functionally identical parts are provided with the same reference numerals.

Show it

Figure 1 is a floating-caliper disc brake in section with a brake rotor in a preferred embodiment.

Figure 2 is a section through a brake rotor and two brake discs in other embodiments.

Figure 3 is a plan view of a brake pad according to the invention with radial guide in a first embodiment.

Fig. 4 is a section through the brake pad along line AA of Fig. 3;

Figure 5 is a partial plan view of a brake carrier with a mechanical actuator.

Fig. 6 is a side view of the brake carrier of Fig. 5, partly in section;

Figure 7 is a partially sectioned plan view of an integrated caliper in a preferred embodiment.

Fig. 8 shows a section through a brake rotor and a brake pad in a further embodiment.

A first exemplary embodiment of a partial brake disc brake according to the preamble of claim 1 is shown schematically in FIG. 1. A non-rotatably but axially displaceable floating caliper 1 grips laterally around a brake rotor 2 and is equipped with a hydraulic actuating device for the service brake, which acts on an internal brake pad 4 via the brake piston 3 and brings this into contact with a friction surface 5 of the brake rotor 2 . When the service brake is actuated further, the floating caliper 1 moves axially until the brake pad 6 is in contact with the friction surface 7 of the brake rotor 2 . Both brake pads 4, 6 are now pressed by an axial clamping force FA from both sides against the brake rotor 2 , which is braked thereby.

The floating caliper is equipped with a further mechanical actuation device, not shown here, which acts on the pad holding plate 8 of the brake pad 6 . The brake pad 6 is movably supported in the radial direction. Its friction lining 9 extends beyond the lining holding plate 8 on its radially inner narrow side. When the parking brake is actuated mechanically, the brake pad 6 is subjected to a radial application force FR, so that its radial friction surface 10 is pressed against an auxiliary friction surface 11 which is arranged all round on the central, pot-shaped area 12 of the brake rotor 2 .

Another embodiment of a brake rotor according to the invention is shown in section in FIG. 2. This brake rotor 2 has, in addition radially inside of the brake pad 4 has a circumferential projection 13 with a Hilfsreibfläche 14. In this embodiment, the brake pad 4 , like its brake pad 6, is provided with a friction lining on its radially inner side. The mechanical actuation device, not shown, is designed here so that it presses both brake pads 4 , 6 onto the auxiliary friction surfaces 11 , 14 of the brake rotor. In Fig. 2 two embodiments of brake discs according to the invention are shown, which have a circumferential projection 15 , 16 radially inside or outside the brake pad 6 with an auxiliary friction surface 17 , 18 against which the brake pad 6 is pressed. Of course, a further projection 19 , 20 can be provided for the brake pad 4 on the other axial side of the brake disc.

Fig. 3 shows a brake pad according to the invention 6, the pad retaining plate 8 two wegstehende in the circumferential direction of the brake rotor 2, coating-free ears 21, 22 has. One ear 21 has an elongated opening 23 in which a guide pin 24 with an eccentric 25 is inserted. The other ear 22 has a circular opening 26 and is mounted on the guide pin 27 so as to be rotatable and axially displaceable. For the mechanical actuation of the parking brake, the guide pin 24 and thus the eccentric 25 are rotated. The brake pad 6 executes a pivoting movement in direction B around the axis of the guide pin 27 , the friction surface 10 of the brake pad 6 being brought into contact with the auxiliary friction surface 11 of the brake rotor 2 . The friction surface 10 is adapted to the auxiliary friction surface 11 by an arcuate profile in the circumferential direction of the brake rotor. The brake pad 6 shown in FIG. 3 is shown again in section along the line AA in FIG. 4 for better understanding.

To illustrate the mechanical actuation device, FIG. 5 shows one half of the brake carrier 28 of a floating caliper disc brake. The bore 29 is used for rigid attachment of the brake carrier 28 to the wheel suspension of the vehicle. The floating caliper 1 is axially displaceably mounted in the bore 30 . The support arm 31 has a support surface 32 for receiving the circumferential force of the brake pad 4, which is axially movably guided here, and a bore 33 in which the guide pin 24 is rotatably mounted for the radial and axial guidance of the brake pad 6 . With the guide pin 24 an operating lever 34 is connected, via the guide pin 24 can be rotated to actuate the parking brake. After actuation, the unit consisting of actuation lever 34 and guide pin 24 is brought back into the starting position by a return spring 35 made of spring wire and the parking brake is released. The return spring 35 is supported on a small projection 36 of the brake carrier 28 . In FIG. 6, the brake support 28 is illustrated once again in a partially sectioned side view. The guide pin 24 has at its end opposite the actuating lever 34 an eccentric 25 which is in the elongated opening 23 in the ear 21 of the brake pad 6 and presses the brake pad 6 in direction B when the guide pin 24 is rotated by the actuating lever 34 .

In the embodiment of the invention shown in FIG. 7, an integrated floating caliper 1 is guided both axially and radially movably directly via two bolts 37 , 38 . When the service brake is actuated hydraulically, the floating caliper 1 is axially displaced and when the parking brake is actuated mechanically, it is pivoted radially in the direction B about the axis of the carrying bolt 37 . The brake pad 6 , which is fixed immovably in the radial direction relative to the floating caliper 1 by means of retaining pins 39 , is pressed with the friction surface 10 of its narrow side against the auxiliary friction surface 11 of the brake rotor 2 . The floating caliper has an additional free space 40 on the inside of its saddle bridge encompassing the brake rotor 2 , so that the saddle bridge cannot come into contact with the brake rotor 2 when the parking brake is actuated. The holding pins 39 are reinforced so that they can transmit the radial application force FR required for pressing the brake pad 6 onto the floating caliper 1 . The guide pin 38 has an oval cross section and is in the eccentric bore 41 of a guide sleeve 42 , which in turn is rotatably mounted in a bore 43 of the floating caliper 1 . The guide sleeve 42 is connected to the actuating lever 34 , which is actuated via a brake cable 44 . To actuate the parking brake by the brake cable 44 , the guide sleeve 42 is rotated via the actuating lever 34 and the floating caliper 1 is pivoted in the direction B due to the eccentric bore 43 .

Fig. 8 shows further embodiments of the brake shoe 6 and the brake rotor 2. The pad holding plate 8 of the brake pad 6 here has an angled section 44 which serves to support the friction lining 9 when its friction surface 10 is pressed against the auxiliary friction surface 11 of the brake rotor 2 by the radial application force FR. The cup-shaped portion 12 of the brake rotor 2 is conical in shape, so that the Hilfsreibfläche 11 is inclined in the section shown by 10 ° relative to the axis of the brake rotor. The friction surface 10 of the friction lining 9 has the same angle.

When the parking brake is actuated, the friction lining 9 wears out slightly over time and there is an increasing clearance between the surfaces 10 and 11 , which extends the actuation path of the parking brake. On the other hand, the friction lining 9 'wears, which is pressed against the friction surface 7 of the brake rotor 2 during the hydraulic actuation of the service brake. However, the service brake has an automatic adjustment device, by means of which the clearance between the friction lining 9 'and the friction surface 7 is kept constant. With increasing wear of the friction lining 9 'consequently the lining holding plate 9 moves in the direction of the friction surface 7 . The friction lining 9 is carried along and the clearance between its friction surface 10 and the auxiliary friction surface 11 is reduced due to the angle of these surfaces. If the angle, as recommended here, is 10 °, the wear of the friction lining 9 of the parking brake is somewhat overcompensated under normal operating conditions, so that the actuation path of the parking brake cannot be extended.

The invention is not limited to those described Embodiments. Rather, the invention extends for all of the above characteristics and for each sensible combination of features. In principle, the invention on all types of brake pads, including those with  Fixed saddle, applicable, even if only the special one simple and advantageous application on disc brakes with Floating saddle, especially with integrated floating saddle closer was explained.

Reference symbol list

1 floating saddle
2 brake rotors
3 brake pistons
4 brake pads
5 friction surface
6 brake pads
7 friction surface
8 pad holding plate
9 friction lining
9 ′ friction lining
10 friction surface
11 auxiliary friction surface
12 pot-shaped area
13 head start
14 auxiliary friction surface
15 head start
16 head start
17 auxiliary friction surface
18 auxiliary friction surface
19 head start
20 head start
21 ear
22 ear
23 opening
24 guide bolts
25 eccentrics
26 opening
27 guide bolts
28 brake carriers
29 hole
30 hole
31 support arm
32 support surface
33 hole
34 operating lever
35 return spring
36 head start
37 carrying bolts
38 guide bolts
39 holding pin
40 free space
41 eccentric bore
42 guide sleeve
43 hole
44 brake cable
45 section

Claims (17)

1. Part brake disc brake, in particular for motor vehicles with a brake disc or a brake rotor, with a non-rotatable brake housing which engages around the radially outer edge of the brake disc and has two brake pads which are arranged axially displaceably on both sides of the brake disc, with a first hydraulic actuating device in the brake housing , which exerts an axial clamping force on the brake pads in order to press them against the brake disk from both sides and a second mechanical actuating device of the brake housing, by means of which at least one of the brake pads is brought into contact with the brake disk, characterized in that the brake disk or the Brake rotor ( 2 ) radially inside or outside the brake pads ( 4 , 6 ) has at least one circumferential projection ( 13 , 15 , 16 , 19 , 20 ) or area ( 12 ) which extends away from the disk surface substantially in the axial direction and one to brake Pad ( 4 , 6 ) facing cylindrical or conical auxiliary friction surface ( 11 , 14 , 17 , 18 ) has at least one brake pad ( 4 , 6 ) on its narrow side facing said auxiliary friction surface ( 11 , 14 , 17 , 18 ) with a friction lining ( 9 ) and that the mechanical actuating device has means ( 24, 25, 34, 38, 42, 44 ), when actuated at least said brake pad ( 4 , 6 ) is moved essentially in the radial direction (B), so that it presses with its narrow side against said auxiliary friction surface ( 11 , 14 , 17 , 18 ). 2. Part brake disc brake according to claim 1, characterized in that at least one brake pad ( 4 , 6 ) in the radially immobile brake housing ( 1 ) is guided substantially radially movable and that the mechanical actuating device has means ( 24 , 25 , 34 ) to the brake pad ( 4 , 6 ) to move in its guide relative to the brake housing ( 1 ). 3. Part brake disc brake according to claim 2, characterized in that the pad holding plate ( 8 ) of said brake pad ( 6 ) has pad-free ears ( 21 , 22 ) which protrude outward in the circumferential direction of the brake disc ( 2 ), that the brake pad ( 6 ) one ear ( 22 ) is rotatably mounted relative to the brake housing ( 1 ) about an axis of rotation lying parallel to the brake disc axis and that an eccentric end ( 25 ) of a bolt ( 24 ) projects through a bore ( 23 ) of the other ear ( 21 ), the central part of which rotatably mounted in the brake housing ( 1 ) and the other end of which is connected to an actuating lever ( 34 ). 4. Part brake disc brake according to claim 1, characterized in that the brake housing ( 1 ) is guided substantially radially movably and that the mechanical actuating device has means ( 34 , 38 , 42 , 44 ) to move the brake housing ( 1 ) in its guide . 5. Part brake disc brake according to claim 1 or 4, with a brake caliper, in particular integrated floating caliper, to which the brake pads are immovably fixed in the radial direction and with two bolt guides arranged in the circumferential direction of the brake disc at a distance, via which the brake caliper slides axially movably on bolts that are firmly connected to the wheel suspension of the vehicle, characterized in that one of the bolts ( 37 , 38 ) or one of the bolt guides has a rotatable eccentric ( 42 ) which is connected to an actuating lever ( 34 ). 6. Part brake disc brake according to claim 5, with two bolts attached to the wheel suspension of the vehicle, one of which serves as a carrying bolt and is dimensioned stronger than the other, which serves as a guide bolt, and with two appropriately dimensioned bolt guides on the brake caliper, characterized in that the smaller guide pin ( 38 ) has an oval cross-section and is rigidly anchored to the wheel suspension of the vehicle, the longitudinal axis of its cross-section being essentially tangential to a circle around the axis of the larger carrying pin ( 37 ) and that the guide pin ( 38 ) is axially in one cylindrical guide sleeve ( 42 ) with an eccentric inner bore ( 41 ) slides, which is rotatably mounted on the brake caliper ( 1 ) and is connected to an actuating lever ( 34 ). 7. Part brake disc brake according to claim 5 or 6, characterized in that the brackets ( 39 ) serving for fastening the brake pads ( 4 , 6 ) on the brake caliper ( 1 ) are dimensioned such that they accommodate the radial application forces which occur during the mechanical actuation of the brake ( FR) can record. 8. Part brake disc brake according to one of claims 1 to 7, characterized in that at least one brake pad ( 4 , 6 ) has a friction lining ( 9 ) which the pad holding plate ( 8 ) of the brake pad ( 4 , 6 ) at least on one side in the radial direction protrudes and also extends in the axial direction over the narrow side of the pad retaining plate ( 8 ). 9. Part brake disc brake according to one of claims 1 to 7, characterized in that the pad holding plate ( 8 ) of a brake block ( 4 , 6 ) on its side facing the brake disc axis has an angled section ( 45 ) which away from the brake disc ( 2 ) in shows essentially in the axial direction and that its surface facing the brake disc axis as well as the main part of the lining holding plate ( 8 ) running parallel to the brake disc is provided with a friction lining ( 9 ). 10. Part brake disc brake according to claim 8 or 9, characterized in that on the narrow side of the brake pad ( 4 , 6 ) and for pressing against the cylindrical or conical auxiliary friction surface ( 11 , 14 , 17 , 18 ) of the brake disc ( 2 ) certain surface ( 10 ) of the friction lining ( 9 ) is complementary in its shape to the shape of the said auxiliary friction surface ( 11 , 14 , 17 , 18 ). 11. Part brake disc brake according to one of the preceding claims, with a brake rotor, the central region of which is shaped like a pot with a pot base and pot wall and which merges radially outward into a brake disk ring on the open side of the pot, characterized in that the circumferential, in has in the axial direction extending outer surface of the cup wall a circumferential auxiliary friction surface ( 11 ) to which the narrow side of the associated brake pad ( 6 ) is pressed essentially in the radial direction (B) during mechanical actuation of the brake. 12. A spot-type disc brake according to claim 11, characterized in that the Hilfsreibfläche (11) is shaped conically on the pot wall of the brake rotor (2) and the cone diameter increases in the direction of the brake disk ring, wherein the angle between the friction surface (11) and the brake rotor axis, preferably 10 ° is. 13. Brake disc for partial brake disc brakes, in particular according to claim 1, characterized in that it has radially inside or outside of its main friction surfaces ( 5 , 7 ) at least one circumferential projection ( 15 , 16 , 19 , 20 ) which is substantially away from the disc surface extends in the axial direction and has a circumferential, cylindrical or conical auxiliary friction surface ( 17 , 18 ). 14. Brake rotor for partial brake disc brakes, in particular according to claim 11 or 12, the central part of which is shaped like a pot with a pot base and pot wall and merges on its open side into a brake disk ring which extends radially outwards, characterized in that the circumferential, in substantially in the axial direction extending outer surface of the cup wall has a circumferential auxiliary friction surface ( 11 ) which is conically shaped and that the cone diameter increases in the direction of the brake disc ring. 15. Brake pad for partial brake disc brakes, in particular according to claim 8, with a pad holding plate and a friction lining fastened thereon, characterized in that the friction lining ( 9 ) projects beyond the pad holding plate ( 8 ) on at least one side and / or over the narrow side of the pad holding plate ( 8 ) extends. 16. Brake pad for partial brake disc brakes, in particular according to claim 9, with a pad holding plate and a friction lining fastened thereon, characterized in that the pad holding plate ( 8 ) is angled substantially vertically on one side and that this angled section ( 45 ) as well as the main part of the Pad holding plate ( 8 ) is provided with a friction lining ( 9 ). 17. Brake pad for partial brake disc brakes according to claim 16, characterized in that the friction surface ( 10 ) of the brake pad ( 9 ) on the angled portion ( 45 ) of the pad holding plate ( 8 ) is concave in a plane parallel to the main part of the pad holding plate and otherwise as a segment of a cylindrical or conical surface is shaped.