Method for producing a brake drum, brake drum and drum brake

Abstract

The invention relates, inter alia, to a brake drum (1) with a drum housing (2) and a friction body (3), wherein the drum housing (2) and the friction body (3) are positively and non-rotatably connected to one another by a plastic deformation of the drum housing (2), to a method for producing such a brake drum (1) and to a drum brake with such a brake drum (1).

Description

[0001] The invention relates to a method for producing a brake drum, a brake drum and a drum brake with such a brake drum.

[0002] Such brake drums are used, for example, in drum brake systems of motor vehicles and are already known in practice in various designs.

[0003] For example, the document AT 125 080 B discloses a brake drum with a brake pad arranged therein or thereon, which has a ring shape and is provided with axial ribs which fit into grooves in the brake drum and secure the inserted or pushed-on, replaceable brake pad in the brake drum against rotation.

[0004] The object of the invention is to provide a brake drum with improved performance characteristics and a method for producing such a brake drum.

[0005] To achieve this objective, a method for producing a brake drum is proposed, comprising the features of the independent claim directed to such a method. To achieve this objective, a method for producing a brake drum with a drum housing and a friction body is proposed, wherein the drum housing and the friction body are positively and non-rotatably connected to one another by plastic deformation of the drum housing.

[0006] The friction body can act as a brake pad and / or be arranged in or on the drum housing.

[0007] To manufacture the brake drum, the drum housing and the friction body can be brought into the relative position required for connection and then connected to each other in a form-fitting and rotationally fixed manner by plastic deformation of the drum housing. This makes it possible to significantly simplify the production of a brake drum.

[0008] The friction body and the drum housing are thus connected to each other by a positive fit, which is created after the two components have been assembled.

[0009] First, the drum housing and the friction element can be brought into the relative position required for their connection. The drum housing can then be plastically deformed, for example, by being specifically pressed in, thereby connecting the drum housing and the friction element in a form-fitting and rotationally fixed manner. This form-fitting connection allows a braking force to be transmitted from the friction element, which can be designed as a friction ring, to a wheel connected to the drum housing.

[0010] In one embodiment of the method, it is provided that the friction body is first introduced into the drum housing, then the drum housing is plastically deformed and thereby the drum housing and the friction body are connected to one another in a form-fitting and rotationally fixed manner.

[0011] In the position of use of the brake drum, the friction body of the brake drum can interact with one or more brake shoes or brake blocks of a drum brake.

[0012] In one embodiment of the method, a friction body is used which, on a side facing the drum housing, has at least one receptacle, for example at least one blind hole and / or at least one through hole, and / or at least one toothing and / or a rough surface and / or a rough surface structure. Material of the drum housing can be displaced into the at least one receptacle, the at least one toothing and / or the rough surface and / or the rough surface structure of the friction body by the plastic deformation of the drum housing in order to create a positive connection between the friction body and the drum housing.

[0013] In one embodiment of the method, the friction body is provided on a side facing the drum housing with at least one receptacle, for example with at least one blind hole and / or with at least one through hole, and / or with at least one toothing and / or with at least one rough surface and / or with a rough surface structure. Material of the drum housing can then be displaced into the at least one receptacle, the at least one toothing and / or the rough surface and / or the rough surface structure of the friction body by the plastic deformation of the drum housing in order to create a positive connection between the friction body and the drum housing.

[0014] In a preferred embodiment of the method, a friction body is used which has, on its side facing the drum housing, in particular on an outer side of the friction body, a plurality of receptacles, preferably in the form of blind holes or through holes, which are preferably arranged uniformly distributed around a longitudinal central axis.

[0015] The at least one receptacle can be produced, for example, by a machining process, in particular by milling into the friction body. In this way, the at least one receptacle can be manufactured simply and cost-effectively.

[0016] In one embodiment of the method, several receptacles are provided on the friction body, preferably in a uniformly distributed arrangement. A uniform distribution of several receptacles promotes a reliable connection between the friction body and the drum housing and thus also the transmission of a comparatively large braking torque between the friction body and the drum housing.

[0017] The plastic deformation of the drum housing can create at least one depression in the drum housing. The at least one depression in the drum housing can be created on an outer side, for example, on an outer circumferential side of the drum housing. In this way, a friction body arranged within the drum housing can be positively and rotationally fixedly connected to the drum housing by the plastic deformation of the drum housing. The plastic deformation of the drum housing can be created by a deformation force directed from the outside in the direction of a central axis of the drum housing.

[0018] In one embodiment of the method, the plastic deformation of the drum housing creates a plurality of depressions on the drum housing, preferably evenly distributed around a longitudinal center axis of the drum housing. The material of the drum housing displaced by the plastic deformation of the drum housing can then enter corresponding receptacles in the friction body. This allows a particularly reliable and resilient connection between the drum housing and the friction body to be created.

[0019] In a preferred embodiment of the method, a friction body of an annular shape is used. The friction body can be formed in one or more parts, particularly as an annular friction body.

[0020] The friction body and the drum housing, which are joined together in the process, can be made of different materials. For example, it is possible to manufacture the friction body from a cast material, particularly cast iron and / or cast steel.

[0021] The drum housing can be made of sheet metal, for example, by deep-drawing. The drum housing can be made of metal, preferably aluminum and / or steel. In a particularly preferred embodiment of the drum housing, it is made of aluminum sheet and / or steel sheet.

[0022] The use of a drum housing made of a metal sheet, for example an aluminum sheet and / or a steel sheet, promotes the targeted plastic deformation to produce the positive and rotationally fixed connection between the friction body and the drum housing of the brake drum.

[0023] In a particularly preferred embodiment of the method, the drum housing can be provided with corrosion protection, in particular with a corrosion protection coating, before and / or after its plastic deformation. In this way, corrosion of the drum housing of the brake drum is effectively prevented or at least delayed.

[0024] In one embodiment of the method, a drum housing is used that has at least one stiffener to increase the transmittable braking torque. The stiffener can, for example, be arranged or formed on an outer side of the drum housing, on which a connection interface to a wheel to be braked with the drum brake, for example, a wheel rim, is formed.

[0025] To achieve the object, a brake drum is also proposed which has the features of the independent claim directed to such a brake drum.

[0026] To solve the problem, a brake drum with a drum housing and a friction body is proposed, wherein the drum housing and the friction body are positively and non-rotatably connected to one another by a plastic deformation of the drum housing.

[0027] In one embodiment of the brake drum, the friction element is inserted into the drum housing. The drum housing and the friction element are positively and non-rotatably connected to each other by the plastic deformation of the drum housing.

[0028] For this purpose, the friction body can have at least one receptacle, for example at least one blind hole, and / or at least one toothing and / or a rough surface and / or a rough surface structure on a side facing the drum housing, into which material of the drum housing is displaced by the plastic deformation of the drum housing in order to produce a positive connection between the friction body and the drum housing.

[0029] A particularly preferred variant of the brake drum is one in which the friction body has, on its side facing the drum housing, preferably on its outer side, a plurality of receptacles, for example a plurality of blind holes or a plurality of through holes, preferably evenly distributed around a longitudinal center axis of the friction body. The material of the drum housing displaced by the plastic deformation can be arranged in these receptacles in order to establish the positive connection between the drum housing and the friction body. Such an embodiment of the brake drum enables reliable transmission of a braking torque between the friction body and the drum housing of the brake drum.

[0030] In one embodiment of the brake drum, the drum housing has, preferably on its outer side, in particular on its outer peripheral side, at least one recess which is produced by the plastic deformation of the drum housing.

[0031] A particularly reliable connection between the drum housing and the friction body is possible if the drum housing has a plurality of depressions, preferably evenly distributed around a longitudinal center axis of the drum housing, which are produced by the plastic deformation of the drum housing.

[0032] In one embodiment of the brake drum, the friction body is annular. Furthermore, the friction body can be formed in multiple parts or in one piece. The drum housing can be drum-shaped and thus configured to accommodate the friction body. The friction body connected to the drum housing is then arranged within the drum housing.

[0033] The brake drum can be designed to be particularly lightweight if the wall thickness of the drum housing is smaller than the ring thickness of the friction body.

[0034] The friction element and the drum housing can be made of different materials. This can also help optimize the weight of the brake drum. In one embodiment of the brake drum, the friction element is made of a cast material, for example, cast iron and / or cast steel, in particular gray cast iron.

[0035] The drum housing may, for example, be made of aluminum and / or steel and preferably be formed from an aluminum sheet and / or a steel sheet.

[0036] The drum housing can be provided with corrosion protection, for example with an anti-corrosive coating.

[0037] To increase the transmittable braking torque, the drum housing can have at least one stiffener. The stiffener can be arranged or formed on an outer side of the drum housing. In one embodiment of the drum housing, the stiffener consists of a rim, preferably closed, that extends around a longitudinal center axis of the drum housing. The stiffener, in particular the rim, can be created by plastic deformation of the drum housing.

[0038] Finally, to solve the problem, a drum brake with a brake drum according to one of the claims directed to such a brake drum is also proposed.

[0039] The invention is described in more detail below using an exemplary embodiment, but is not limited to this exemplary embodiment. Further exemplary embodiments result from combining the features of individual or multiple claims with one another and / or from combining individual or multiple features of the exemplary embodiment. They show: Fig. 1: a perspective sectional view of a brake drum according to the invention, Fig. 2: an enlarged detailed view from Fig. 1, Fig. 3: a detailed view of a drum housing of the brake drum shown in the previous figures and Fig. 4: a single part view of a friction body used in the Fig. 1 and Fig. 2, which in the position of use is arranged within the drum housing and is positively connected to it.

[0040] The figures each show at least parts of a brake drum, designated as a whole by 1. The brake drum 1 comprises a drum housing 2 and a friction body 3, which forms a brake lining of a drum brake equipped with the brake drum 1.

[0041] The drum housing 2 friction bodies 3 are positively and non-rotatably connected to one another by a plastic deformation of the drum housing 2.

[0042] The figures show that the friction body 3 is arranged in the drum housing 2 and that the drum housing 2 and the friction body 3 are connected to one another in a rotationally fixed and form-fitting manner by the plastic deformation of the drum housing 2. Accordingly, on an outer circumferential side 6 of the drum housing 2, the drum housing 2 has a plurality of depressions 5 produced by the plastic deformation. According to the individual part view of the drum housing 2, the depressions 5 are made of Fig. 3 arranged in two rows and evenly distributed around a longitudinal center axis of the drum housing 2 on the outer peripheral side 6 of the drum housing 2.

[0043] In particular, the Fig. 2 and Fig. 4 illustrate that the friction body 3 has at least one receptacle 4 on a side facing the drum housing 2 in the position of use of the friction body 3, namely on its outer peripheral side 7, in the embodiment shown a plurality of receptacles 4 in the form of blind holes.

[0044] The individual part representation of the friction body 3 from Fig. 4 shows that the receptacles 4 are formed in two rows and evenly distributed on the outer peripheral side 7 of the friction body 3.

[0045] Material of the drum housing 2 is displaced into these receptacles 4, which are designed as blind holes, by the plastic deformation of the drum housing 2, whereby the positive connection between the friction body 3 and the drum housing 2 is established.

[0046] The figures illustrate that the friction body 3 is annular. Depending on the embodiment, the friction body 3 can also be formed in multiple parts or in one piece. The drum housing 2 is drum-shaped, with a wall thickness of the drum housing 2 being noticeably smaller than the ring thickness of the friction body 3 of the brake drum 1.

[0047] The friction body 3 and the drum housing 2 are made of different materials. In the embodiment of the brake drum 1 shown in the figures, the drum housing consists of a metal sheet, for example, aluminum or steel. The friction body 3, in turn, is made of a cast material, namely gray cast iron.

[0048] The drum housing 2 of the brake drum 1 is also provided with corrosion protection, for example in the form of a corrosion protection coating. To increase the transmittable braking torque, the drum housing 2 has at least one stiffener 8. The stiffener 8 is created by plastic deformation of the drum housing 2 and is designed in the form of a closed rim extending around the longitudinal center axis of the drum housing 2.

[0049] In the position of use, the brake drum 1 forms a functional element of a drum brake of a motor vehicle, not shown separately in the figures.

[0050] The brake drum 1 described above can be manufactured according to the method described below.

[0051] In this case, the drum housing 2 and the brake body 3 are connected to each other in a form-fitting and rotationally fixed manner by a plastic deformation of the drum housing 2.

[0052] Before the plastic deformation of the drum housing 2, the drum housing 2 and the friction body 3 are first brought into a relative position required for their connection. For example, the friction body 3 can be inserted into the drum housing 2. The drum housing 2 is then plastically deformed, for example, by being specifically pressed in, in order to connect the drum housing 2 and the friction body 3 in a form-fitting and rotationally fixed manner. Accordingly, a plurality of recesses 5 created by the plastic deformation are formed on an outer side, namely on the outer circumferential side 6 of the drum housing 2.

[0053] The friction body 3 has a plurality of receptacles 4 in the form of blind holes on a side facing the drum housing 2. These receptacles 4 are arranged in two rows, evenly distributed around a longitudinal center axis of the friction body 3 on the outer peripheral side 7 of the friction body 3. In another embodiment of the brake drum 1, the receptacles 4 can be arranged in one or more rows, evenly distributed around a longitudinal center axis of the friction body 3 on the outer peripheral side 7 of the friction body 3. The side of the friction body 3 on which the receptacles 4 are formed is an outer peripheral side 7 of the friction body 3.

[0054] Due to the plastic deformation of the drum housing 2, material of the drum housing 2 is specifically displaced into these receptacles 4 in order to establish the positive connection between the friction body 3 and the drum housing 2 of the brake drum 1.

[0055] The figures illustrate that a one-piece, annular friction body 3 is used in the manufacture of the brake drum 1. The use of a two- or multi-piece friction body 3 is also possible in principle.

[0056] As already mentioned, the friction body 3 and the drum housing 2 are made of different materials. The drum housing 2 can be provided with corrosion protection, in particular with a corrosion protection coating, before and / or after its plastic deformation.

[0057] To increase the transmittable torque, the drum housing 2 has at least one stiffener 8. In the drum housing 2 shown in the figures, the stiffener 8 consists of a rim produced by plastic deformation of the drum housing 2 and encircling the longitudinal center axis of the drum housing 2. List of reference symbols 1 brake drum 2 drum housings 3 friction bodies 4 Recording 5 Deepening 6 Outer circumference side of 2 7 Outer circumference side of 3 8 Stiffening QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] AT 125 080 B

[0003]

Claims

[1] Method for producing a brake drum (1) with a drum housing (2) and a friction body (3), wherein the drum housing (2) and the friction body (3) are connected to one another in a form-fitting and rotationally fixed manner by at least one plastic deformation of the drum housing (2). [2] Method according to claim 1, wherein the drum housing (2) and the friction body (3) are first brought into a relative position required for their connection, in particular wherein the friction body (3) is introduced into the drum housing (2), after which the drum housing (2) is plastically deformed, whereby the drum housing (2) and the friction body (3) are connected to one another in a form-fitting and rotationally fixed manner. [3] Method according to claim 1 or 2, wherein the friction body (3) has at least one receptacle (4), in particular at least one blind hole and / or at least one through hole, and / or at least one toothing and / or a rough surface and / or a rough surface structure, on a side facing the drum housing (2), into which material of the drum housing (2) is displaced by the plastic deformation of the drum housing (2) in order to produce a positive connection between the friction body (3) and the drum housing (2). [4] Method according to one of the preceding claims, wherein at least one depression (5) is produced on the drum housing (2) by the plastic deformation of the drum housing (2). [5] Method according to one of the preceding claims, wherein the plastic deformation of the drum housing (2) produces a plurality of depressions (5) on the drum housing (2), preferably arranged uniformly distributed around a longitudinal central axis of the drum housing (2). [6] Method according to one of the preceding claims, wherein the friction body (3) is annular and / or formed in one or more parts. [7] Method according to one of the preceding claims, wherein the friction body (3) and the drum housing (2) consist of different materials, for example wherein the friction body (3) consists of a cast material, in particular of cast iron and / or cast steel, and the drum housing (2) consists of aluminum and / or steel, in particular of aluminum sheet and / or steel sheet. [8] Method according to one of the preceding claims, wherein the drum housing (2) is provided with corrosion protection, in particular with a corrosion protection coating, before and / or after its plastic deformation. [9] Method according to one of the preceding claims, wherein a drum housing (2) is used which has at least one stiffener (8) to increase a transmittable braking torque. [10] Brake drum (1) with a drum housing (2) and a friction body (3), wherein the drum housing (2) and the friction body (3) are positively and non-rotatably connected to one another by a plastic deformation of the drum housing (2). [11] Brake drum (1) according to the preceding claim, wherein the friction body (3) is arranged in the drum housing (2) and the drum housing (2) and the friction body (3) are positively and non-rotatably connected to one another by the plastic deformation of the drum housing (2). [12] Brake drum (1) according to one of the preceding claims, wherein the friction body (3) has, on a side facing the drum housing (2), at least one receptacle (4), in particular at least one blind hole and / or at least one through hole, and / or at least one toothing and / or a rough surface and / or a rough surface structure, into which material of the drum housing (2) is displaced by the plastic deformation of the drum housing (2) in order to produce a positive connection between the friction body (3) and the drum housing (2). [13] Brake drum (1) according to one of the preceding claims, wherein the friction body (3) has, on a side facing the drum housing (2), a plurality of receptacles (4), preferably arranged uniformly distributed around a longitudinal central axis of the friction body (3), in particular a plurality of blind holes and / or a plurality of through holes. [14] Brake drum (1) according to one of the preceding claims, wherein the drum housing (2), preferably on its outer side, has at least one depression (5) which is produced by the plastic deformation of the drum housing (2), preferably wherein the drum housing (2) has a plurality of depressions (5), in particular arranged uniformly distributed around a longitudinal central axis of the drum housing (2), produced by the plastic deformation of the drum housing (2). [15] Brake drum (1) according to one of the preceding claims, wherein the friction body (3) is annular and / or multi-part or one-part and / or wherein the drum housing (2) is drum-shaped, preferably wherein a wall thickness of the drum housing (2) is smaller than a ring thickness of the friction body (3). [16] Brake drum (1) according to one of the preceding claims, wherein the friction body (3) and the drum housing (2) consist of different materials, for example wherein the friction body (3) consists of a cast material, in particular of cast iron and / or cast steel, and the drum housing (2) consists of aluminum and / or steel, in particular of aluminum sheet and / or steel sheet. [17] Brake drum (1) according to one of the preceding claims, wherein the drum housing (2) is provided with corrosion protection, in particular with a corrosion protection coating. [18] Brake drum (1) according to one of the preceding claims, wherein the drum housing (2) has at least one stiffener (8) to increase a transmittable braking torque. [19] Drum brake with a brake drum (1) according to one of the preceding claims.

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