DE102022212780A1 - Disc brake system - Google Patents

Abstract

The present disclosure describes a disc brake system (100) comprising a brake pad (106) and a brake caliper (110) with a housing and a housing finger (111) for actuating the brake pad (106). In the disc brake system (100), the brake pad (106) and the housing finger (111) are mechanically connected to one another by a fastening assembly (112), wherein the fastening assembly (112) is configured to limit a relative movement between the housing finger (111) and the brake pad (106) with respect to an actuation direction (A) of the housing finger (111).

Description

This disclosure relates to a disc brake system having a piston and a brake pad.

Car manufacturers are forcing brake suppliers to solve the most important problems of disc brake systems: squeaking noises, drag torque, increased mass of components, pedal travel feel, brake and disc dust. Reducing drag torque in particular is proving to be a difficult problem.

Drag torque is caused by both residual resistance and the suction of the brake pads. Residual resistance describes a partial and temporary contact between the brake disc and the brake pads while driving. Suction, on the other hand, describes a longer-term contact between the brake disc and the brake pads, whereby the brake pads are sucked onto a surface of the brake disc.

One approach to reducing residual resistance is to use a return spring, which uses the spring effect to return the brake pads to an initial position after the braking phase.

Thus revealed EN 10 2015 223555 A1 a brake pad guide for reducing the frictional resistance in a brake caliper arranged in a vehicle brake. The brake pad guide is installed in the brake caliper to shape the spring force so that the brake pads are spaced away from the brake disc.

While the use of a spring can be useful for reducing drag torque, it also requires the installation of additional parts into a disc brake system, adding weight and manufacturing costs.

The aim of the present disclosure is to describe an alternative approach to reducing the resistance moment. This aim is achieved by the disc brake system according to claim 1.

The disc brake system comprises a brake pad and a brake caliper with a housing and a housing finger for actuating the brake pad. The brake pad and the housing finger are mechanically connected to one another by a fastening assembly, wherein the fastening assembly is designed to limit a relative movement between the housing finger and the brake pad with respect to an actuation direction of the housing finger.

The fastening assembly can reduce the drag torque because the fastening assembly allows the brake pad to be pulled away from a brake disc of the disc brake system after the braking phase by a return movement of the housing finger itself. As a result of the reduced drag torque, the disc brake system according to the present disclosure can also help to reduce material wear, overall fuel consumption, noise and the generation of brake dust. The proposed modification of a disc brake system also does not require any additional parts.

Preferred embodiments of the disc brake system are described below.

In a preferred embodiment, the mounting assembly is configured to restrict relative movement such that play with respect to the relative movement of the piston and the brake pad in the actuation direction is limited to a range between 0.1 mm and 0.2 mm.

In another preferred embodiment, the fastening assembly is additionally or alternatively designed to enable a relative rotational movement between the housing finger and the brake pad in a plane perpendicular to the actuation direction of the housing finger.

In a further preferred embodiment, the fastening assembly additionally or alternatively comprises a circular arc-shaped guide element. Furthermore, the fastening assembly comprises a fastening element which is fastened to the guide element and is designed to limit a relative movement of the guide element with respect to the fastening element in the actuation direction of the housing finger.

In a variant of this embodiment, which comprises a guide element and a fastening element, the fastening element is designed to move along the guide element in order to enable a relative rotational movement between the housing finger and the brake pad in a plane perpendicular to the actuation direction of the housing finger.

In another variant, the guide element is additionally or alternatively at least partially formed by a groove in a surface and the fastening element is at least partially inserted into the groove.

In a further variant, the guide element is additionally or alternatively at least partially formed by a raised surface and the fastening element is arranged along the raised surface and/or covers the raised surface.

In another variant, the guide element is additionally or alternatively circular.

In another variant, the fastening element is additionally or alternatively at least partially pin-shaped and/or circular-arc-shaped.

In a further variant, the guide element and the fastening element are shaped such that the fastening element is attached to the guide element by a positive connection.

In an additional variant, the fastening element is additionally or alternatively attached to the guide element via a snap connection and/or an undercut.

In another variant, the fastening assembly additionally or alternatively comprises a plurality of guide elements and a plurality of corresponding fastening elements. In one implementation of this variant, the plurality of guide elements are arranged on a fastening surface and at least partially form two or more concentric circles.

In another variant, the guide element is additionally or alternatively arranged on a side of the housing finger facing the brake pad and the fastening element is arranged on a side of the brake pad facing the housing finger.

In a further variant, the fastening element is additionally or alternatively arranged on a side of the housing finger facing the brake pad and the guide element is arranged on a side of the brake pad facing the housing finger.

In a preferred embodiment, the disc brake system is additionally or alternatively designed for use in a passenger car.

• 1 zeigt eine Seitenansicht eines Scheibenbremssystems, das eine Befestigungsbaugruppe umfasst;
• 2a zeigt eine gehäusezugewandte Seite eines Bremsklotzes, die Teil der Befestigungsbaugruppe der 1 ist;
• 2b zeigt eine bremsklotzzugewandte Seite eines Gehäusefingers, die Teil der Befestigungsbaugruppe der 1 ist;
• 2c zeigt eine Querschnittsansicht des Gehäusefingers und des Bremsklotzes aus 1, wenn diese aneinander befestigt sind;
• 2d zeigt eine vergrößerte Ansicht der in 2c gezeigten Querschnittsansicht;
• 3a zeigt eine gehäusefingerzugewandte Seite eines Bremsklotzes, die zwei Befestigungselemente umfasst;
• 3b zeigt eine bremsklotzzugewandte Seite eines entsprechenden Gehäusefingers, die zwei Führungselemente umfasst;
• 4a zeigt einen Gehäusefinger, der drei Befestigungselemente umfasst, die entlang zweier konzentrischer Kreise angeordnet sind; und
• 4b zeigt eine Relativbewegung des Gehäusefingers aus 4a bezüglich eines entsprechenden Bremsklotzes.

In the following, various embodiments of the disc brake system according to the present disclosure are described with reference to the figures. First, a brief summary of the figures will be given.

• 1 shows a side view of a disc brake system including a mounting assembly;
• 2a shows a housing-facing side of a brake pad, which is part of the mounting assembly of the 1 is;
• 2 B shows a brake pad facing side of a housing finger, which is part of the mounting assembly of the 1 is;
• 2c shows a cross-sectional view of the housing finger and the brake pad from 1 when they are attached to each other;
• 2d shows an enlarged view of the 2c shown cross-sectional view;
• 3a shows a housing finger-facing side of a brake pad comprising two fastening elements;
• 3b shows a brake pad-facing side of a corresponding housing finger, which comprises two guide elements;
• 4a shows a housing finger comprising three fastening elements arranged along two concentric circles; and
• 4b shows a relative movement of the housing finger 4a regarding a corresponding brake pad.

In the following, a detailed description of the embodiment shown in the figures is given. The description begins with a description of a first embodiment of the disc brake system as proposed in the present disclosure and refers to 1 and 2a -d.

1 shows a side view of a disc brake system 100 that includes a mounting assembly 112.

In the 1 In the embodiment shown, the disc brake system 100 is a floating caliper disc brake system for a motor vehicle. However, other embodiments are also suitable for use in other vehicles. The disc brake system 100 comprises a brake disc 108. Furthermore, the disc brake system 100 comprises a floating caliper with a caliper housing 110. In the floating caliper arrangement shown, a piston 102 is arranged on a side of the brake disc 108 that is closer to the vehicle interior when installed in the vehicle. The piston 102 actuates a brake pad 104, which is often referred to as an inner brake pad. On an opposite side of the brake disc 108, the disc brake system 100 comprises another brake pad 106, which is often referred to as an outer brake pad. The brake pad 106 is actuated by a housing finger 111 of the brake caliper housing 110, which when the Piston 102 is pulled in the direction of the brake disc 108. The brake pad 106 and the housing finger 111 are mechanically connected to one another by a fastening assembly 112, wherein the fastening assembly 112 is designed to limit a relative movement between the housing finger 111 and the brake pad 106 with respect to an actuation direction A of the housing finger. The actuation direction A corresponds to a direction of movement of the housing finger 111 when the piston 102 is actuated. The actuation direction A runs approximately parallel to a plane in which the brake disc 108 lies. Thus, the actuation direction A is approximately parallel to an axis of a car when the disc brake system 100 is mounted.

The mounting assembly 112 of the disc brake system 100 is designed to enable a relative rotational movement between the housing finger 111 and the brake pad 106 in a plane perpendicular to the actuation direction A of the housing finger 111.

Details regarding the implementation of the mounting assembly 112 are described below with reference to 2a-2d described.

2a shows a housing-facing side of the brake pad 106, which is part of the mounting assembly 112 of the 1 is. 2 B shows a brake pad facing side of the housing finger 111, which is part of the mounting assembly 112 of the 1 is.

The mounting assembly 112 includes two circular arc-shaped guide elements 112.1A and 112.1B. In addition, the mounting assembly 112 includes two mounting elements 112.2A and 112.2B, each of which is attached to one of the guide elements 112.1A and 112.1B when installed in the disc brake system 100 and is configured to limit relative movement of the guide element 112.1A and 112.1B with respect to the mounting element 112.2A and 112.2B in the actuation direction A of the housing finger 111.

In the 2a-2d In the implementation of the fastening assembly shown, the guide elements are arranged on the side of the brake pad 106 facing the housing finger and the fastening elements are arranged on the side of the housing finger 111 facing the brake pad. In the present example, the brake pad 106 comprises a back plate and a friction material attached to the back plate. The guide elements are therefore arranged on a side of the back plate facing the housing finger.

The guide elements 112.1A and 112.1B are both arcuate to guide the fastening elements 112.2A and 112.2B along a circular path and to enable the relative rotational movement. The guide elements 112.1A and 112.1B are formed as grooves on a surface formed by the housing-facing side of the brake pad 106. The guide element 112.1A comprises a wide entry section 112.1Aw and a narrower locking section 112.1An, the narrower locking section having an undercut (not shown). The guide element 112.1B is identically shaped.

As described above, the housing finger 111 includes two fasteners 112.2A and 112.2B that are in the form of pins, each having a wide head and a narrow body. The wide head of the pins 112.2A and 112.2B are shaped such that each of the pins 112.2A and 112.2B can be inserted through the entry portion 112.1Aw into the groove of the guide member 112.1A, and also the guide member 112.1B. The fasteners 112.2A and 112.2B can then be securely attached to the guide members 112.1A and 112.1B by rotating the housing finger 111 and the brake pad 106 relative to each other so that each pin is moved into the narrow portion of the guide member 112.1A and 112.2B. The described shape creates a positive connection that makes it possible to fasten the fastening element 112.2A and the fastening element 112.2B to the guide element 112.1A or the guide element 112.1B. However, other types of connection, e.g. snap connections or other undercuts, can also be used to connect the fastening element and the guide element.

In the In the example shown, the guide elements 112.1A and 112.1B are arcuate and form part of a circle. In other embodiments of the disc brake system, the guide elements 112.1A and 112.1B can also form a full circle.

In other embodiments not shown here, the guide elements 112.1A and 112.1B can also be formed at least partially by an elevation on a surface, and the fastening elements 112.2A and 112.2B can be arranged along the elevation and/or cover the elevation.

2c shows a cross-sectional view of the housing finger 111 and the brake pad 106 when they are attached to each other. The cross-sectional view also shows the arcuate grooves of the guide elements 112.1A and 112.1B within the side of the brake pad 106 facing the housing finger.

2d shows an enlarged view of the 2c shown cross-sectional view.

The shape of the pin and the shape of the grooves including the undercut (not visible in the figure) are selected such that an axial gap 112.4 between the pin and the groove is small in order to limit the relative movement between the housing finger 111 and the brake pad 106 with respect to the actuation direction A of the housing finger 111. At the same time, the shape of the pin and the shape of the groove are selected such that a radial gap 112.3 between the pin and the groove is sufficiently large to enable the relative rotational movement between the housing finger 111 and the brake pad 106 in a plane perpendicular to the actuation direction A of the housing finger 111.

For the axial gap, a clearance of less than 0.2 mm, especially less than 0.1 mm, is preferred. Regarding the radial gap, a clearance of greater than 0.1 mm should be used.

In the 2a -d, the guide elements 112.1A and 112.1B are part of the brake pad 106 and the fastening elements 112.2A and 112.2B are part of the housing finger 111. However, in other embodiments this may be different. Such an embodiment is described below with reference to 3a and 3b described.

3a shows a housing finger-facing side of a brake pad 206, which comprises two fastening elements 212.1A and 212.2B. 3b shows a brake pad-facing side of a corresponding housing finger 211, which comprises two guide elements 212.1A and 212.1B. The shape of the guide elements 212.1A and 212.1B is identical to that of the guide elements 112.1A and 112.1B. The same applies to the fastening elements 212.2A and 212.2B and the fastening elements 112.2A and 112.2B.

The housing finger 211 and the brake pad 206 can be replaced by 1 instead of the housing finger 111 and the brake pad 106.

In particular, if the surface to which the guide elements are attached is small or has an irregular shape, it may be difficult to attach a sufficiently large number of guide elements to the surface to ensure a stable attachment between the housing finger and the brake pad, and to align all the fastening elements along the same circular path. This problem can be solved by aligning the fastening elements along two or more concentric circles. Such an embodiment is described below with reference to 4a and 4b described.

4a shows a housing finger 311 comprising three fastening elements 312.1AC arranged along two concentric circles 312.5 and 312.6. 4b shows a relative movement of the housing finger 311 from 4a regarding a corresponding brake pad 306.

Both figures show the housing finger 311 and its guide elements 312.1A-C in solid lines. The guide elements 312.1A and 312.1B are arranged along a path of the circle 312.5 and the guide element 312.1C is arranged along a path of the circle 312.6. Both circles (shown in dashed lines) are concentric to each other.

Furthermore, both figures show a brake pad 306, which comprises three corresponding guide elements 312.2AC in the form of pins, which can be inserted into the guide elements 312.1AC. In the example, the guide elements 312.1AC and the fastening elements 312.2AC are like those in the 2a -Federation 3a -b shown guide elements and fastening elements. However, they can also be designed in any other way.

The three guide elements 312.1A-C and the three fastening elements 312.2A-C ensure a stable connection between the brake pad 306 and the housing finger 311. At the same time, the arrangement of the guide elements 312.1A-C along two concentric circles 312.5 and 312.6 still allows a relative rotational movement between the brake pad 306 and the housing finger 311.

In summary, the present disclosure describes a disc brake system (100) comprising a brake pad (106) and a brake caliper (110) with a housing and a housing finger (111) for actuating the brake pad (106). In the disc brake system (100), the brake pad (106) and the housing finger (111) are mechanically connected to one another by a fastening assembly (112), wherein the fastening assembly (112) is designed to limit a relative movement between the housing finger (111) and the brake pad (106) with respect to an actuation direction (A) of the housing finger (111).

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 102015223555 A1 [0005]

Claims (14)

Disc brake system (100), comprising: a brake pad (106), and a brake caliper (110) with a housing and a housing finger (111) for actuating the brake pad (106); wherein the brake pad (106) and the housing finger (111) are mechanically connected to one another by a fastening assembly (112), wherein the fastening assembly (112) is configured to limit a relative movement between the housing finger (111) and the brake pad (106) with respect to an actuation direction (A) of the housing finger (111). Disc brake system (100) according to Claim 1 , wherein the fastening assembly (112) is arranged to enable a relative rotational movement between the housing finger (111) and the brake pad (106) in a plane perpendicular to the actuating direction (A) of the housing finger (111). Disc brake system (100) according to Claim 1 or 2 , wherein the fastening assembly (112) comprises: a guide element (112.1A, 112.1B) in the shape of a circular arc, and a fastening element (112.2A, 112.2B) which is fastened to the guide element (112.1A, 112.1B) and is configured to limit a relative movement of the guide element (112.1A, 112.1B) with respect to the fastening element (112.2A, 112.2B) in the actuating direction (A) of the housing finger (111). Disc brake system (100) according to Claim 3 , wherein the fastening element (112.2A, 112.2B) is arranged to move along the guide element (112.1A, 112.1B) to enable a relative rotational movement between the housing finger (111) and the brake pad (106) in a plane perpendicular to the actuating direction (A) of the housing finger (111). Disc brake system (100) according to Claim 3 or 4 , wherein the guide element (112.1A, 112.1B) is at least partially formed by a groove in a surface and the fastening element (112.2A, 112.2B) is at least partially inserted into the groove. Disc brake system (100) according to one of the Claims 3 until 5 , wherein the guide element (112.1A, 112.1B) is at least partially formed by an elevation on a surface and the fastening element (112.2A, 112.2B) is arranged along the elevation and/or covers the elevation. Disc brake system (100) according to one of the Claims 3 until 6 , wherein the guide element (112.1A, 112.1B) is circular. Disc brake system (100) according to one of the Claims 3 until 7 , wherein the fastening element (112.2A, 112.2B) is at least partially pin-shaped and/or circular-arc-shaped. Disc brake system (100) according to one of the Claims 3 until 8th , wherein the guide element (112.1A, 112.1B) and the fastening element (112.2A, 112.2B) are shaped such that the fastening element is fastened to the guide element by a positive connection. Disc brake system (100) according to one of the Claims 3 until 9 , wherein the fastening element (112.2A, 112.2B) is fastened to the guide element (112.1A, 112.1B) via a snap connection and/or an undercut. Disc brake system (100) according to one of the Claims 3 until 10 wherein the fastening assembly (112) comprises a plurality of guide elements (112.1A, 112.1B) and a plurality of respective fastening elements (112.2A, 112.2B). Disc brake system according to Claim 11 , wherein the plurality of guide elements (312.1AC) are arranged on a mounting surface and at least partially form two or more concentric circles (312.5, 312.6). Disc brake system (100) according to one of the Claims 3 until 12 , wherein the guide element (212.1A, 212.1B) is arranged on a side of the housing finger (211) facing the brake pad and the fastening element (212.2A, 212.2B) is arranged on a side of the brake pad (206) facing the housing finger. Disc brake system (100) according to one of the Claims 3 until 12 , wherein the fastening element (112.2A, 112.2B) is arranged on a side of the housing finger (111) facing the brake pad and the guide element (112.1A, 112.1B) is arranged on a side of the brake pad (106) facing the housing finger.

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