ES1228145U - Brake disc for vehicle disc brakes (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Brake disc for vehicle disc brakes, comprising a friction ring (1) with a braking track (1.2), and a bell (2) which is concentric to the friction ring (1), which extends axially from the friction ring (1) and comprising a determined outside diameter (2D), characterized in that the bell (2) comprises a plurality of axial joining protrusions (2.1) protruding from the external diameter (2D) of said bell (2) and that are distributed around a central axis (2.3) of the bell (2), and an axial hole (2.2) that is made in each axially attached protrusion (2.1) and that comprises an internal thread that extends to along at least part of the length of said axial hole (2.2), and the friction ring (1) comprises an axial through hole (1.4) for each axial joining protrusion (2.1) of the bell (2), which is aligned with the axial hole (2.2) of the axial joint protrusion (2.1) spontaneous and facing said axial hole (2.2), the brake disc (100) comprising a joining element (4) for each axial joint protrusion (2.1), which is housed at least partially in the axial hole (2.2) of the corresponding axial joint protrusion (2.1) passing through the axial through hole (1.4) of the friction ring (1) aligned with said axial hole (2.2) and comprising a thread complementary to the threading of the corresponding axial hole (2.2), the friction ring (1) comprising a joint area (1.3) extending from the braking track (1.2) to an inner radius of said friction ring (1) and comprising a thickness less than the braking track (1.2), the axial through holes (1.4) of said friction ring (1) being made in said joint zone (1.3). (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

Brake disc for vehicle disc brakes

TECHNICAL SECTOR

The present invention relates to brake disks for vehicle disc brakes.

PRIOR STATE OF THE TECHNIQUE

Motor vehicles include a braking system to brake it voluntarily, which includes a brake disc and at least one brake pad for each wheel. The brake pad cooperates with the corresponding disc, in particular with a braking area or track of the disc, to brake the vehicle, producing a friction between the disc and the brake pad. During braking the kinetic energy of the movement of the wheel is transformed into heat due to friction.

A brake disc of a vehicle comprises a friction ring that rotates integral with a wheel of the vehicle and that comprises the braking track. The friction ring must be capable of absorbing and dissipating the heat produced during braking, by transforming the kinetic energy during the friction of the pads and the brake disc, as well as resisting the stresses generated by braking torque. For these reasons the friction rings are conventionally made of cast iron.

The brake discs comprise, in addition to the friction ring, a cylindrical projection, or bell, concentric to the friction ring, but with a smaller outer diameter, and extending axially from said friction ring. Normally, the friction ring and the bell are made of the same material and together, forming a single body.

In other cases, the friction ring and the bell can be manufactured independently. This offers a series of advantages such as, for manufacturing, employing in each case the material that best suits the needs required. Thus, the weight of the brake discs can be lightened, for example, since lighter materials can be used in manufacturing, especially in the case of the bell which requires less resistance than the friction ring. Once fabricated, the friction ring and the bell are joined by suitable joining means for this.

The bearing face of the bushing determines the minimum internal diameter of the bell and the minimum outer diameter of the bell is defined starting from that data plus the thickness of the bell. The outer diameter of the braking track is defined on the basis of the wheel rim and the kinetic energy to be absorbed by the brake disc and the inner diameter of the braking track depends on the pads and their arrangement. Thus, the space between the surface defining said inner diameter and said braking track is delimited by design, and the joining means have to be arranged in said space. This is not problematic in brake discs of large diameters, where due to the dimensions said space is large enough to be able to use the means of union considered appropriate. DE10032972A1, for example, discloses the use of an insert in said space to join the friction ring and the bell to each other. The space to arrange the insert is not problematic in this case.

However, especially in brake discs of certain diameters, generally less than 320mm, the radial space between the surface that defines the inner diameter of the bell and the braking track of the friction ring is very limited, and can not be combined both elements as desired, not being possible, for example, to use the union disclosed in DE10032972A1. That is why, in this type of brake discs, the friction ring and the bell are usually made of the same material as a single body, thus avoiding the problem of the union between both elements.

US2016 / 0160948 A1 discloses a solution for joining the friction ring and the bell made independently, which is adapted for discs in which the radial space between the surface that defines the inner diameter of the bell and the braking track of the friction ring it is very limited, in such a way that it is allowed to obtain the advantage of being able to lighten said brake discs despite the limitations derived from its diameter. To do this, the hood includes recesses made on the surface that defines the outer diameter of said bell, resulting, for each recess, a wall of reduced section of the bell. The walls of reduced section are configured to be able to arrange joining elements, such as rivets, which join the friction ring and the bell.

EXHIBITION OF THE INVENTION

The object of the invention is to provide a brake disk for disc brakes of vehicles, in particular for brake discs where the radial space existing between the surface defining the inner diameter of the bell and the braking track of the ring of friction is very limited, as defined in the claims.

The brake disc comprises a friction ring and a concentric bell. The friction ring comprises a braking track, with which the braking operation is carried out.

The bell extends axially from the friction ring, and comprises a given outer diameter, a plurality of axial joining protrusions protruding from said outer diameter, which are distributed around a central axis of the bell and which extend axially, and an axial hole made in each axially joining protuberance and comprising a mouth and comprising an internal thread extending along at least part of the length of said axial hole.

The friction ring comprises an axial through hole for each axially connecting protuberance of the bell, and which is aligned with the axial hole of the corresponding joint protrusion and facing the mouth of said axial hole. The brake disk comprises a joining element for each axially joining protrusion, which is housed at least partially in the axial hole of the corresponding axial joint protrusion and passes through the through hole of the friction ring aligned with said axial hole. Said connecting element comprises a thread complementary to the threading of the corresponding axial hole.

In this way, the length of the axial job can be used to make the connection between the friction ring and the bowl, which results in a more robust and, therefore, safer union, which is also valid even for brake discs in which the radial distance available for the union is very small, so that you can get brake discs in which the friction ring and the bell have been manufactured independently and are subsequently joined. The proposed solution gives the joining elements more surface for anchoring, without the need to increase the radial space required for its actuation (which, as has been discussed in discs where the radial space between the surface that defines the internal diameter of the the bell and the braking track of the friction ring is very limited), and, furthermore, providing an axial connection between said friction ring and said bell allows to further reduce the radial space required to carry out said union. In addition, when a thread is incorporated to make the joint, said union between the friction ring and the bell is more stable and robust.

The friction ring comprises a connection area extending from the braking track to an inner radius of said friction ring and comprising a thickness less than the braking track, in such a way that the material necessary to carry out the operation is reduced. brake disk, this fact also having repercussion in its reduction of weight, and the axial through holes of said friction ring made in said union zone.

These and other advantages and characteristics of the invention will become apparent in view of the figures and the detailed description of the invention.

DESCRIPTION OF THE DRAWINGS

Figure 1 is a perspective view of a realization of a brake disc of the invention.

Figure 2 is another perspective view of the brake disc of Figure 1.

Figure 3 shows a sectional view of the brake disk of figure 1.

DETAILED EXHIBITION OF THE INVENTION

A vehicle includes a braking system to stop it voluntarily, as they can be the disc brakes, for example. The disc brakes include, for each wheel, a brake disk 100 as shown in the exemplary figures, and at least one brake pad (not shown in the figures). The brake pads cooperate with the corresponding brake disc 100 for braking the vehicle, in particular with a braking area or track 1.2 of the brake disc 100, producing a friction between the brake disc 100 and the brake pad causing the brake disc. braking.

The brake disk 100 comprises a friction ring 1 centered on the central axis 101, which comprises the braking track 1.2 on which the corresponding pads act. The brake disc 100 further comprises a bell 2 which is concentric to the friction ring 1, which extends axially from the friction ring 1 and which comprises an internal diameter 2.0 and a determined outer diameter 2D. Generally the inner diameter 2.0 is delimited by design.

The bell 2 comprises a plurality of axial connecting protuberances 2.1 distributed around the central axis 101, projecting from the outer diameter 2D of said bell 2. The bell 2 further comprises an axial hole 2.2 made in each axial joining protrusion 2.1, and each axial hole 2.2 which is preferably circular perimeter. The friction ring 1 comprises an axial through hole 1.4 for each axial joint protrusion 2.1 of the bell 2, which is aligned with the axial blind hole 2.2 of the corresponding axial joint protrusion 2.1 and facing said axial hole 2.2. Preferably, the axial hole 2.2 is a blind hole.

The brake disk 100 comprises a connection element 4 for each axial connection protrusion 2.1, which is partially housed in the axial hole 2.2 of the corresponding axial joint protrusion 2.1 and passes through the axial through hole 1.4 of the friction ring 1 aligned with said axial hole 2.2, thus leaving the friction ring 1 and the bell 2 connected by the joining elements 4. The alignment between an axial through-hole 1.4 and its associated axial hole 2.2 makes it possible to connect the friction ring 1 and the bell 2 a safe way and keeping them focused, in a simple way. The connecting element 4 can be inserted into the axial hole 2.2, in such a way that the connection can easily be made from the rear part of the brake disk (action represented by the arrow F in FIG. 2), if so required.

This connection makes it possible to join the friction ring 1 and the bell 2 in a robust and easily way into brake discs 100 even with a reduced diameter, where the radial distance D between the surface of the bell 2 defining the internal diameter 2.0 and the bell 2 and the friction track 1.2 of the friction ring is limited, as previously explained.

The axial holes 2.2 of the bell 2 comprise a thread that preferably extends along all or a large part of its length, although only part of said length could be extended, and the connecting elements 4 comprise a thread complementary to said thread, to provide a stable and robust connection between the friction ring 1 and the bell 2, in addition to facilitating the realization of said union (it is sufficient to screw the connecting element 4 to the corresponding axial hole 2.2). The thread of the connecting elements 4 can extend along the entire length of the corresponding joint element 4 or along part of its length. The more the threading of the axial hole 2.2 extends, the more joining surface is provided to join the friction ring 1 and the bell 2 (assuming that the joint 4 has a threaded length at least equal to the threaded length of said hole. axial 2.2).

Preferably, the connecting element 4 is a screw threaded at least partially (at least part of its surface that is housed in the corresponding longitudinal hole 2.2), with a head on which is acted to carry out its threading.

The friction ring 1 also comprises a connection area 1.3 extending from the braking track 1.2 to the surface delimiting an inner diameter of said friction ring 1, which preferably coincides with the internal diameter 2.0 of the bell 2, being the axial through holes 1.4 of said friction ring 1 made in said joint zone 1.3, in such a way that they do not interfere with the braking track 1.2. The bell 2 is supported on the joint area 1.3 of the friction ring 1, the friction track 1.2 being for the braking operations and the brake disc 100 does not lose efficiency or operability.

Thanks to the proposed invention, brake discs 100 can be made where the radial space existing between the surface defining the inside diameter of the bell 2 and the brake track 1.2 of the friction ring 1 is very limited, which are generally the discs with diameters 100D less than 320 mm, in which the friction ring 1 and the bell 2 are manufactured independently, as, for example, bimetallic brake discs 100. This makes it possible to reduce the total weight of the brake disc 100 in comparison with the brake discs 100 made from the same material, since lightweight materials such as aluminum can be used to manufacture the bell 2, for example. The friction ring 1 also comprises a smaller thickness in the joint area 1.3 than in the braking track 1.2, in such a way that the material needed to make the brake disc 100 is reduced, this also having an effect on weight reduction .

Preferably, the brake disk 100 is bimetallic, the friction ring 1 and the bell 2 being made of different metals. Preferably, in addition, the friction ring 1 is made of gray cast iron (cast iron) and the bell 2 is made of aluminum.

The axial joint protuberances 2.1 can extend along the entire axial length of the bell 2, or along part of said axial length. Furthermore, the axial connection protuberances 2.1 are preferably distributed equidistantly around the central axis 101 of the brake disc 100, thus having a homogeneous connection between the friction ring 1 and the bell 2 along its entire contour.

Furthermore, the axial connection protrusions 2.1 are used for the cooling of the brake disc 100, since they strike the air as if they were fins, causing their displacement. Thus, in addition to providing a robust connection between the friction ring 1 and the bell, the axial joint protrusions 2.1 play an important role in the cooling of the brake disc 100. The number of axial joint protrusions 2.1 and / or their distribution they do not depend solely on the requirements of union between the friction ring 1 and the bell 2, this number and / or distribution can be selected besides considering the refrigeration requirements. It could even be the case, when the number of protuberances required for the cooling requirements are greater than that required for the joining requirements, for example, that the brake disc 100 comprises some protuberances that do not have a joining element 4, since its function is only to move the air for refrigeration reasons. In this case, these additional protuberances could have an axial hole 2.2 or other type of hole for saving material and weight, or be solid.

In the disc 100, the bell 2 lacks any recess from its outer diameter 2D, in such a way that the outer surface of said bell 2 follows its outer diameter 2D in the areas without protrusions and, in the areas with protuberances, protrude of said outer diameter 2D following said protuberances.

The subtraction between the thickness of the bell 2 in the areas without axial joint protrusions 2.1 and the thickness of said bell 2 in the areas with axial joint protrusions 2.1 is smaller than the diameter of the axial hole 2.2. This allows to take advantage of part of the minimum thickness of the hood 2, which is the thickness between its internal diameter 2.0 and its outer diameter 2D, for the axial holes 2.2, which allows not to increase the size and weight of the hood 2 significantly . This solution is especially advantageous in brake discs 100 with diameters less than 320 mm, as mentioned.

Claims (11)

1. Brake disc for vehicle disc brakes, comprising a friction ring (1) with a braking track (1.2), and a bell (2) which is concentric to the friction ring (1), which extends axially from the friction ring (1) and comprising a determined outer diameter (2D), characterized in that the bell (2) comprises a plurality of axial joining protuberances (2.1) protruding from the outer diameter (2D) of said bell ( 2) and that are distributed around a central axis (2.3) of the bell (2), and an axial hole (2.2) that is made in each axially attached protrusion (2.1) and that comprises an internal thread that extends to along at least part of the length of said axial hole (2.2), and the friction ring (1) comprises an axial through hole (1.4) for each axial joining protrusion (2.1) of the bell (2), which is aligned with the axial hole (2.2) of the corresponding axial joint protrusion (2.1) and facing said axial hole (2.2), the brake disc (100) comprising a joining element (4) for each axial joining protrusion (2.1), which is housed at least partially in the axial hole (2.2) of the protrusion of axial connection (2.1) corresponding, passing through the axial through hole (1.4) of the friction ring (1) aligned with said axial hole (2.2) and comprising a thread complementary to the threading of the corresponding axial hole (2.2), comprising the friction ring (1) a connection area (1.3) extending from the braking track (1.2) to an inner radius of said friction ring (1) and comprising a thickness less than the braking track (1.2) , the axial through holes (1.4) of said friction ring (1) being made in said joint zone (1.3). 2. Brake disk according to claim 1, wherein the axial holes (2.2) of the bell (2) comprise a thread extending along its entire length. 3. Brake disk according to claim 1 or 2, wherein the connecting element (4) is a screw at least partially threaded. 4. Brake disc according to any of claims 1 to 3, wherein the axial through hole (1.4) of the friction ring (1) comprises a thread complementary to the thread of the corresponding joint element (4). 5. Brake disc according to any of claims 1 to 4, wherein the axial hole (2.2) is a blind hole. 6. Brake disc according to any of claims 1 to 5, wherein the axial joint protuberances (2.1) are distributed equidistantly around the central axis (2.3) of the bell (2). Brake disc according to any one of claims 1 to 6, wherein the axial joint protuberances (2.1) extend along the entire axial length of the bell (2). Brake disc according to any one of claims 1 to 7, wherein the bell (2) lacks any recess from its outer diameter (2D), such that the outer surface of said bell (2) follows its outer diameter (2D) in the zones without protuberances and, in the areas with protrusions, protrude from said external diameter (2D) following said protuberances. Brake disc according to any one of claims 1 to 8, wherein the brake disc (100) is bimetallic, the friction ring (1) and the bell (2) being made of different metals. 10. Brake disc according to claim 9, wherein the friction ring (1) is made of cast iron and the bell (2) is made of aluminum. The brake disc according to any of claims 1 to 10, wherein the subtraction between the thickness of the bell (2) in the areas without axial joint protuberances (2.1) and the thickness of said bell (2) in the zones with axial joint protuberances (2.1) is smaller than the diameter of the axial hole (2.2).