Brake disc

Abstract

The invention relates to a brake disc (1), comprising a brake disc cap (2), a friction ring (3) having two friction ring discs (3a, 3b), and a plurality of pin-shaped connections (4) for connecting the brake disc cap (2) to the friction ring (3), which pin-shaped connections (4) are accommodated in respective channels (8) of a receiving region (7) of the friction ring (3). The receiving region (7) is attached only directly to one of the two friction ring plates (3a). A cooling channel (5) is formed between the friction ring plates (3a, 3b). A connecting bridge (6) connecting the friction rings (3a, 3b) to each other is present in the cooling channel (5). The connecting bridge (6) extends from the radially outer end of the channel (8) of the receiving region (7) up to up to one third of the length of the channel (8) of the receiving region (7). At least one cylindrical support (9a, 9b) extends from the receiving region (7) to the other friction ring plate (3b), is spaced from the respective connecting bridge (6), and at least mostly does not extend along the channel (8).

Description

Technical Field

[0001] The present invention relates to a brake disc of the type described in the technical solution of the present application, comprising a brake disc cap, a friction ring having two friction ring plates, and a plurality of pin-shaped connecting members for connecting the brake disc cap to the friction disc, wherein the pin-shaped connecting members are accommodated in corresponding channels in the accommodating area of ​​the friction ring. Background Art

[0002] Patent document DE 102006043945 A1 discloses a universal brake disc. The brake disc is connected to the friction ring via a plurality of connecting pieces arranged along its circumference and extending in the radial direction. The holes in the receiving area are suitable for accommodating the connecting pieces, and the receiving area is directly attached to only one of the two friction ring plates, so that the central axis of the connecting piece deviates from the center of the friction ring in the axial direction of the friction ring. Cooling channels are formed between the friction ring plates, and connecting bridges connecting the friction ring plates are arranged in the cooling channels. These connecting bridges also extend to the area above the connecting piece holes.

[0003] Patent document DE 102016122321 A1 discloses a similar brake disc. This document also describes, among other things, various embodiments of a connection element for connecting the brake disc cap to the friction ring.

[0004] Patent document EP 3712459 B1 discloses an improved solution of the above composite brake disc. Compared with the conventional composite brake disc, the distance between the brake disc cap and the inner diameter side surface of the friction ring is narrower, thereby improving the fluidity of the cooling channel formed between the friction ring discs.

[0005] Patent document DE 102010024389 A describes a connection mechanism between a friction ring of a brake disc and a brake disc cap, wherein the friction ring is connected to the brake disc cap via a plurality of connecting pieces. The connecting pieces are distributed on the circumference of the brake disc cap and connected thereto, and extend into the notch of the radial inner peripheral wall of the friction ring. The holes in the friction ring and the connecting pieces are both conical.

[0006] Patent document DE 102009002690 A1 describes another brake disc, which comprises two friction rings and a disc cap connected to the friction rings via a connecting piece. A load-bearing bridge is arranged between the two friction rings, in which a surrounding recess is present.

[0007] Patent document DE 102008044339 B4 discloses a brake disc device for a disc brake, comprising a friction ring, a connection adapter for connecting the brake disc device to a wheel hub, and a plurality of connection pieces for connecting the friction ring to the connection adapter. The connection adapter has a fastening area in which the connection piece is fixed, and the fastening area is configured as a return groove extending radially from the outer circumference of the connection adapter. In addition, the connection adapter has a radial recess for air circulation, which extends from the inner circumference of the connection adapter to its fastening area for the connection piece. The connection piece is accommodated in the accommodating area of ​​the friction ring so that the friction ring can move radially relative to the connection piece.

[0008] Patent document DE 10103639 A1 describes a connecting element designed as a hollow pin, which is intended to be able to increase the cooling capacity of the friction ring.

[0009] Patent document DE 102007054393 A1 discloses a ventilated brake disk having a friction ring and a carrier portion. A plurality of connecting portions connected to the carrier portion are provided on the circumference of the carrier portion, and the connecting portions protrude into an extension portion formed on the friction ring.

[0010] Patent document EP 2337967 B1 describes another ventilated brake disc with friction rings and a bearing part, wherein the friction ring is composed of at least two friction ring plates separated by a bridge plate, and a plurality of connecting parts connected to the bearing part are arranged on the circumference of the bearing part, and these connecting parts protrude into the bearing bridge plate formed on the friction ring. The bearing bridge plate is arranged between the friction rings, and there is a gap between the friction ring plates. However, since the supporting bridge plate is arranged in the center, only a limited amount of cooling air can flow into the cooling channel of the friction ring.

[0011] Patent document DE 102013215997 A1 describes a brake disc for a disc brake, comprising a brake disc cap and a friction ring connected thereto via a connecting mechanism. The brake disc cap shell is provided with sections with reduced wall thickness and / or openings, which are configured as axial material recesses on the outer circumference of the brake disc cap shell, for placing the connecting mechanism as close to the brake disc cap shell as possible.

[0012] Patent document DE 102009021852 A1 discloses another brake disc, wherein the brake disc cap and the friction ring of the brake disc are connected to each other via a pin-shaped connecting piece, and the connecting piece is embedded in the brake disc cap by enlarging the axial through-opening of the brake disc cap.

[0013] Patent document DE 19843399 A1 also describes a brake disc, whose friction ring and brake disc cap are also connected by such a connecting piece. The wall of the brake disc cap is designed to be flexible in the radial direction.

[0014] Patent document EP 2275702 B1 describes other connecting elements which are formed in one piece with the friction ring and are wedge-shaped on the side thereof which is received in the friction ring.

[0015] Patent document GB 1032923 describes a brake disc, wherein a friction ring is cast on the guide surface of the hub body. When the temperature rises and the brake disc expands, the friction ring can move radially relative to the brake disc cap.

[0016] Patent document DE 19918667 A1 discloses a brake disc for a vehicle disc brake, comprising a disc cap segment and a friction ring segment, wherein the friction ring segment has two friction rings interconnected via a bridge plate. The disc cap segment and the friction ring segment engage with each other to achieve form fit in the axial direction and the circumferential direction and limit displacement in the radial direction.

[0017] Patent document US Pat. No. 5,862,892 A describes a composite rotor for a disc brake, comprising an outer friction segment having two ring segments, an inner hub portion having a central mounting segment, and a peripheral segment cast into a cavity of the outer friction segment.

[0018] During braking, the friction rings in conventional brake discs deform due to the high forces they are subjected to, causing the hole that accommodates the pin-shaped connector to change from a round shape to an oval shape. This generates tensile stresses, which are further aggravated by the connecting bridge above the hole and the forces acting on the hole.

[0019] A common challenge with these composite brake discs is that airflow from the vehicle interior to the disc cap openings in the disc cooling channels can only flow to a limited extent. Summary of the invention

[0020] In view of this, the object of the present invention is to provide a brake disc, which includes a brake disc cap, a friction ring having two friction ring plates, and a plurality of pin-shaped connecting members for connecting the brake disc cap to the friction ring, wherein the pin-shaped connecting members are accommodated in corresponding channels in the accommodating area of ​​the friction ring, thereby reducing the load borne by the channels for accommodating the pin-shaped connecting members.

[0021] In order to achieve the above-mentioned objective, the present invention provides a brake disc according to the technical solution of the present application.

[0022] In the brake disc according to the present invention, the connecting bridges that connect the friction ring plates of the friction ring to each other extend from the radial outer end of the channel of the accommodating area along the channel of the accommodating area to up to one third of the length of the channel in the accommodating area, thereby greatly reducing the load applied by these connecting bridges to the channel or the accommodating area where the channel is located.

[0023] Furthermore, the brake disc according to the invention comprises at least one columnar support member which is spaced from the corresponding connecting bridge and at least mostly does not extend along the bore, extending from the corresponding receiving area to the friction ring plate which is not connected to the receiving area. The at least one columnar support member arranged between the receiving area and the relative friction ring plate ensures that the two friction ring plates fully support each other and that the cooling air from the brake disc cap fully enters the cooling channel formed between the friction ring plates. The columnar support member at least mostly does not extend along the bore for accommodating the pin-shaped connecting member, which reduces the pressure exerted on the bore by the friction ring when thermal deformation occurs during braking, and ultimately significantly reduces the stress on the bore and the receiving area.

[0024] In a particularly advantageous improvement of the present invention, at least one columnar support extends along the channel up to one third of the channel diameter. In this way, the channel for accommodating the pin-shaped connecting element can be fully relieved of pressure, thereby reducing the stress in the channel and the accommodating area.

[0025] In another particularly advantageous development of the invention, two columnar support elements extend from the receiving area to the other friction ring plate, are spaced apart from the respective connecting bridges, and at least mostly do not follow the bore, which significantly increases the stability of the brake disc.

[0026] In order to significantly improve the ingress of cooling air into the cooling channel, in a further advantageous embodiment of the invention a through-opening to the cooling channel is provided between the two columnar supports.

[0027] In another embodiment of the invention, at least one columnar support element is substantially parallel to the rotational axis of the brake disc, which results in an improvement in the strength of the brake disc.

[0028] In order to improve both the stability between the friction ring plates and the introduction of cooling air into the cooling channels between the friction ring plates, at least one columnar support element can have a drop-shaped, diamond-shaped or circular cross-section, wherein the drop-shaped cross-section has been found to be particularly advantageous for promoting the flow of cooling air into the cooling channels of the brake disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The principles of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Figure 1 A perspective view showing a first embodiment of a brake disc according to the present invention;

[0031] Figure 2 Shows Figure 1 an enlarged cross-sectional view of the brake disc showing the connecting bridge and columnar support members;

[0032] Figure 3 Shown along Figure 2 A cross-sectional view taken along the midline III-III;

[0033] Figure 4 Shown along Figure 2 Cross-sectional view taken along the midline IV-IV;

[0034] Figure 5 Shown along Figure 3 Sectional view taken along midline VV;

[0035] Figure 6 A perspective view showing a second embodiment of a brake disc according to the present invention;

[0036] Figure 7 Shows Figure 6 an enlarged cross-sectional view of the brake disc showing the connecting bridge and columnar support members;

[0037] Figure 8 Shown along Figure 7 A cross-sectional view taken along the midline VIII-VIII;

[0038] Fig. 9 Shown along Figure 7 A cross-sectional view taken along the midline IX-IX;

[0039] Fig.10 Shown along Figure 8 Sectional view taken along the midline XX. DETAILED DESCRIPTION

[0040] Figure 1 An internally ventilated brake disc 1 designed as a composite brake disc is shown, which comprises in a known manner a central brake disc cap 2, around the circumference of which a friction ring 3 is arranged. The friction ring 3 has two friction ring plates 3a, 3b and is connected to the brake disc cap 2 via a plurality of pin-shaped connecting elements 4, which extend radially from the brake disc cap 2 to the friction ring 3. The friction ring 3 is slidably mounted on the pin-shaped connecting elements 4, whereby during thermal loading of the brake disc 1, the friction ring 3 can expand freely and radially without hindrance and is therefore less susceptible to cracking.

[0041] The outer planes of the friction ring plates 3a and 3b have respective friction surfaces 3a1 and 3b1. Figure 3 and Figure 8. A cooling channel 5 is formed between the friction ring plates 3a, 3b, through which cooling air can flow in a known manner from the direction of the brake disc cap 2 through the friction ring 3 to the outside of the brake disc 1 during operation of the brake disc 1. A plurality of connecting bridges 6 are present in the cooling channel 5, through which the friction ring plates 3a, 3b are also connected in a known manner, or the friction ring plates 3a, 3b are supported on the connecting bridges 6. When loaded, for example during braking, the connecting bridges 6 absorb the forces acting on the friction ring plates 3a, 3b. In addition, the friction ring 3 has a plurality of receiving areas 7 for receiving pin-shaped connecting elements 4. The task of the receiving areas 7 is precisely to receive the pin-shaped connecting elements 4 in their area facing away from the brake disc cap 2, i.e. in their shaft area. The receiving areas 7 are directly attached to only one of the two friction ring plates, in this figure to the friction ring plate 3a, i.e. the receiving areas 7 are not directly connected to the other friction ring plate 3b. The connection between the receiving area 7 and the friction ring plate 3a occurs during the casting of the friction ring 3. When the friction ring 3 is cast, the receiving area 7 is also cast, which is achieved by a corresponding design of the casting mold (not shown in the figure). The receiving area 7 is only indirectly connected to the friction ring plate 3b, that is, connected via the connecting bridge 6 and the support members 9a, 9b, as described in detail below.

[0042] Figure 3 and Figure 4 The dotted line in the figure indicates the boundary of the accommodation area 7. Accordingly, the accommodation area 7 extends from the first side wall 7a to the opposite second side wall 7b via the accommodation channel 8 in the circumferential direction of the brake disc 1, extends from the friction ring plate 3a to the upper end 7c via the accommodation channel 8 in the axial direction of the brake disc 1, and extends from the inner diameter 3c of the friction ring 3 to the rear end 7d along the accommodation channel 8 in the radial direction of the brake disc 1 (as shown in FIG. Figure 3 As shown). The receiving area 7 does not include the connecting bridge 6, that is, the connecting bridge 6 is considered to be separated from the receiving area 7.

[0043] The brake disc cap 2 forms the connection of the brake disc 1 to the chassis (not shown) of the motor vehicle equipped with the brake disc 1 in a known manner. In addition, the friction ring 3 engages the respective brake pads (not shown) in a known manner in order to achieve the desired deceleration effect of the motor vehicle. The pin-shaped connection 4 transmits the braking torque acting on the friction ring 3 to the brake disc cap 2 and thus to the motor vehicle. The pin-shaped connection 4 is therefore subject to high loads and must remain intact for the effect of the brake disc. The same applies to the receiving area 7 for receiving the pin-shaped connection 4.

[0044] In order to accommodate the pin-shaped connector 4, the above-mentioned accommodating area 7 is provided with a corresponding channel 8. The pin-shaped connector 4 is first inserted into the channel 8, and the brake disc cap 2 is cast onto the pin-shaped connector 4 and then onto the friction ring 3 in the next step. In this example, the channel 8 is designed as a through hole leading to one of the cooling channels 5 of the friction ring 3, but it can also be designed as a blind hole, that is, the channel 8 can be designed as one of the cooling channels 5 that does not lead to the friction ring 3. Such a technical solution can prevent water from entering the channel 8 and avoid the corrosion problem caused thereby, which is irrelevant to other embodiments of the brake disc 1 described herein.

[0045] The area where the brake disc cap 2 is cast onto the pin-shaped connecting member 4 is designed to be as small as possible and only large enough to absorb the forces introduced into the brake disc cap 2 via the friction ring 3 and the pin-shaped connecting member 4 as required.

[0046] In order to prevent the connecting bridge 6 from causing excessive load on the receiving area 7, in particular on the channel 8 in which the pin-shaped connecting element 4 is arranged, the connecting bridge 6 at least does not completely extend along the channel 8 of the receiving area 7. Generally speaking, the connecting bridge 6 extends along the channel 8 of the receiving area 7 from the radially outer end of the channel 8 of the receiving area 7 (i.e., from the rear end 7d of the receiving area 7 or its end facing away from the brake disc cap 2) to up to one third of the length of the channel 8 of the receiving area 7. In this example, the connecting bridge 6 extends along the channel 8 of the receiving area 7 from the radially outer end of the channel 8 of the receiving area 7 (i.e., from the rear end 7d of the receiving area 7) to up to one fifth of the length of the channel 8 of the receiving area 7. In other words, compared with the technical solutions known in the prior art, in which the connecting bridge 6 extends almost to the inner edge of the friction ring 3, the connecting bridge 6 according to the present invention is significantly shortened in the radial direction.

[0047] Furthermore, at least one (two in this example) columnar support members 9a, 9b extend from the receiving area 7 connecting one friction ring plate 3a, in particular from the side walls 7a, 7b thereof, to the other friction ring plate 3b.

[0048] Therefore, the receiving area 7 does not contain the support members 9a, 9b, see Figure 3 and Figure 4 The dotted line boundary of the middle receiving area 7.

[0049] At least one columnar support 9a, 9b is spaced apart from the corresponding connecting bridge 6 and at least for the most part does not extend along the channel 8 of the receiving area 7. In particular, at least one columnar support 9a or 9b or in this case the two largest columnar supports 9a, 9b extend along the channel 8 by one third of its diameter. Therefore, the channel 8 is substantially free of the connecting bridge 6 and at least one columnar support or the above-mentioned columnar supports 9a, 9b. This avoids the introduction of forces into the area where the channel 8 of the receiving area 7 is located and whose strength has been weakened by the channel 8. Therefore, at least one columnar support 9a or 9b represents a continuation of the connecting bridge 6, but ensures that the pressure applied to the channel 8 of the receiving area 7 is smaller than that of the current technical solutions with a continued connecting bridge.

[0050] One or first columnar support 9a is arranged on the first side wall 7a of the accommodation area 7, while the other or second columnar support 9b is arranged on the opposite side wall 7b of the accommodation area 7. With this arrangement, the forces between the friction ring plates 3a, 3b acting on the columnar support members 9a, 9b are conducted via the side walls 7a and 7b of the accommodation area 7 rather than via the channels 8 therein.

[0051] As mentioned above, Figures 1 to 5 In the illustrated embodiment of the brake disc 1, between the receiving area 7 connected to the friction ring plate 3a and the other friction ring plate 3b, the two columnar support members 9a, 9b are spaced apart from the corresponding connecting bridge 6, and at least most of them do not extend along the channel 8. In addition, it can be seen from the figure that there is a through hole 10 leading to the cooling channel 5 between the two columnar support members 9a, 9b, so that the air from the brake disc cap 2 can enter the cooling channel 5 through the columnar support members 9a, 9b.

[0052] At least one cylindrical support member (in this example, cylindrical support members 9a, 9b) is substantially parallel to the rotation axis ( Figure 3 The middle mark is "x").

[0053] from Figure 5 As can be seen from the cross-sectional view, at least one columnar support or in this case two columnar support members 9a, 9b have a drop-shaped or oval cross section. Alternatively, the columnar support members 9a and / or 9b can also be designed to have a diamond-shaped, circular or other suitable cross section. In principle, it is also conceivable that the cross section of the columnar support members 9a, 9b changes over the length of their route from the receiving area 7 to the friction ring plate 3b.

[0054] Refer to the following Figures 6 to 10 A second embodiment of the brake disc 1 is described, only the Figures 1 to 5 The differences to the first embodiment of the brake disc 1 are shown, but these differences do not affect the columnar support elements 9a, 9b.

[0055] Figures 6 to 10 In the illustrated embodiment of the brake disc 1 , the pin-shaped connecting element 4 is substantially cylindrical and has a diameter of 3 mm to 6.5 mm. Figures 6 to 10 In the exemplary embodiment of the brake disc 1 shown, the length of the pin-shaped connecting element 4 is 20 mm to 30 mm.

[0056] from Figure 6 As can be seen from the perspective view of the brake disc 1, the number of pin-shaped connectors 4 is much greater than that of the brake discs in the prior art. In particular, the number of pin-shaped connectors 4 is 21 to 42, preferably 27 to 32. Such a large number of pin-shaped connectors 4 can significantly reduce the diameter and length of the pin-shaped connectors 4.

[0057] Figures 1 to 5 In the first embodiment of the brake disc 1 shown, there is an unspecified gap between the brake disc cap 2 and the friction ring 3, which gap is relatively large, and a large amount of cooling air required to cool the friction ring 3 (the air flowing through the friction ring 3 as described above) can flow through this gap, resulting in strong heating of the friction ring 3.

[0058] In contrast, Figures 6 to 10 The gap width between the brake disc cap 2 and the friction ring 3 in the brake disc 1 is much narrower than conventional ones. In this way, the amount of air flowing out through the gap is less, and the amount of air entering the cooling channel 5 between the friction ring plates 3a, 3b of the friction ring 3 is more, thereby improving the cooling of the friction ring 3.

Claims

1. A brake disc (1), comprising a brake disc cap (2), a friction ring (3) having two friction ring plates (3a, 3b), and a plurality of pin-shaped connecting members (4) for connecting the brake disc cap (2) to the friction ring (3), the pin-shaped connecting members (4) being received in corresponding channels (8) of a receiving area (7) of the friction ring (3), wherein: The receiving area (7) is directly attached to only one friction ring plate (3a) of the two friction ring plates, wherein a cooling channel (5) is formed between the friction ring plates (3a, 3b), wherein a connecting bridge (6) is provided in the cooling channel (5) for connecting the friction ring plates (3a, 3b) to each other, It is characterized in that The connecting bridge (6) extends from the radial outer end of the hole (8) of the accommodating area (7) along the hole (8) of the accommodating area (7) to up to one third of the length of the hole (8) of the accommodating area (7); at least one columnar support member (9a, 9b) extends from the accommodating area (7) to another friction ring plate (3b), is spaced from the respective connecting bridge (6) and does not extend along the hole (8) at least for the most part.

2. The brake disc according to claim 1, characterized in that The at least one columnar support (9a, 9b) extends along the bore (8) up to one third of the diameter of the bore (8).

3. The brake disc according to claim 1 or 2, characterized in that Two columnar support members (9a, 9b) extend from the receiving area (7) to the other friction ring plate (3b), are spaced apart from the respective connecting bridges (6) and at least mostly do not extend along the channel (8).

4. The brake disc according to claim 3, characterized in that A through opening (10) leading to the cooling channel (5) is present between the two columnar support members (9a, 9b).

5. The brake disc according to any one of claims 1 to 4, characterized in that The at least one cylindrical support (9a, 9b) is substantially parallel to the axis of rotation (x) of the brake disc (1).

6. The brake disc according to any one of claims 1 to 5, characterized in that The at least one columnar support (9a, 9b) has a drop-shaped, rhombus-shaped or circular cross-section.

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