Patent Application
20240401654
This application claims priority from Germany Patent Application No. 102023205052.8, filed on May 30, 2023, which is hereby incorporated by reference for all purposes as if fully set forth herein.
Embodiments of the present disclosure relate to a drum brake for separating noise and a noise prevention device of the drum brake.
The squeal noise of a drum brake system is generated by a vibration interaction between a lining (a lining holder) and a drum. Then, all other components of the brake system and an axle system begin to vibrate. Due to increases in friction, pressure, and temperature effects or changes, the overall system vibrates near a specific frequency, but in different directions (phases). As a result of the interaction between the components in contact with each other, the system becomes unstable to generate squeal noise, and thus undesirable sound waves diffuse due to vibrations of the components having large surfaces, such as a drum or lining. Accordingly, a driver and people outside a vehicle hear the squeal noise.
For brake suppliers, there is an objective to develop a noiseless and robust braking system regardless of an axle.
The squeal noise is caused by not only axle components (a knuckle, a suspension, an upper control arm, a lower control arm, a stabilizer, and a damper), but also all components including brake components and brake drums. In order to separate the vibrations and natural frequencies of the axle system and the brake system, a portion connecting the two systems is required to be considered. In other words, demands for stable brake systems regardless of surrounding components such as drums and axles are increasing.
Therefore, it is an aspect of the present disclosure to provide a drum brake capable of separating vibrations of an axle shaft and a noise prevention device of the drum brake.
In accordance with one aspect of the present disclosure, a drum brake provided in a vehicle includes a brake drum provided to be mounted on a wheel and including at least one bolt accommodation hole and a noise prevention device connected to one end of an axle shaft and configured to connect an axle flange including at least one bolt hole and the brake drum.
The noise prevention device may include a circular damping shim including at least one connecting hole and at least one cylindrical hollow shim configured to enter the at least one bolt accommodation hole, wherein the at least one cylindrical hollow shim may be coupled to the at least one connecting hole.
The circular damping shim may be formed of a metal layer.
The circular damping shim may be formed of a metal layer and a rubber layer.
The circular damping shim may be formed of a metal layer of which two surfaces are coated with rubber.
The circular damping shim may be formed of a metal layer, a rubber layer, and a bonding layer.
A thickness of the metal layer may be in a range of 0.6 mm to 1 mm.
A thickness of the rubber layer may be in a range of 0.2 mm to 0.4 mm.
In accordance with another aspect of the present disclosure, a noise prevention device of a drum brake is provided to connect an axle flange and a brake drum, wherein the axle flange is connected to one end of an axle shaft and includes at least one bolt hole, and the brake drum is provided to be mounted on a wheel and includes at least one bolt accommodation hole.
These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Like reference numerals denote like elements throughout the specification. In the specification, all elements of the embodiments are not described, and general contents in the art or repeated contents between the embodiments will not be described. Terms such as parts, modules, members, and blocks may be realized using a software or hardware, and a plurality of parts, modules, members, and blocks are realized in a single element, or one part, module, member, or block may also include a plurality of elements.
Throughout the specification, when a part is referred to as being “connected” to another part, it includes “directly connected” to another part and “indirectly connected” to another part, and the “indirectly connected” to another part includes “connected” to another part through a wireless communication network.
In addition, when a part “includes” an element, another element may be further included, rather than excluding the existence of another element, unless otherwise described.
Throughout the specification, when a member is referred to as being “on” another member, the member is in contact with another member or yet another member is interposed between the two members.
Terms such as first, second, and the like are used herein to distinguish one element from another element, and the elements are not limited to the above-described terms.
As used herein, singular forms “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Reference numerals in operations are used for the sake of convenience in description and do not describe an order of the operations, and the operations may be performed through an order different from the described order unless the context clearly indicates a specific order.
Hereinafter, an operational principle and embodiments of the disclosure will be described with reference to the accompanying drawings.
As illustrated in
Referring to
A bolt 112 may be coupled to the bolt hole 111 of the axle flange 110, and a length of the bolt 112 may be greater than a length of the bolt hole 111 so that the bolt 112 may enter a bolt accommodation hole (not shown) formed in an outer circumferential surface of the brake drum 200.
As described above, the coupling structure of the brake drum 200 and the axle of the conventional drum brake is a structure which is difficult to prevent vibrations of the brake system and an axle system from interacting.
Referring to
One end of the axle shaft 100 is connected to the axle flange 110. The axle flange 110 may include at least one bolt hole 111. According to one embodiment, the bolt hole 111 may be provided as four or five bolt holes 111. However, the present disclosure is not limited thereto, and the number of bolt holes 111 may vary according to a design.
A bolt 112 is coupled to the bolt hole 111 of the axle flange 110, and the length of the bolt 112 is greater than the length of the bolt hole 111 so that bolt 112 enters a bolt accommodation hole (not shown) formed in an outer circumferential surface of the brake drum 200.
The brake drum 200 is provided to be mounted on a wheel 300 and may include at least one bolt accommodation hole (not shown).
The noise prevention device 150 may include a damping shim 151, including at least one connecting hole (not shown) and at least one cylindrical hollow shim 152.
The at least one cylindrical hollow shim 152 may be formed to be coupled to the at least one connecting hole (not shown). In addition, the at least one cylindrical hollow shim 152 may enter the at least one bolt accommodation hole (not shown) provided in the brake drum 200. Accordingly, bolt 112 passing through bolt hole 111 of axle flange 110 may enter or may be inserted into the cylindrical hollow shim 152, which enters the bolt accommodation hole (not shown).
According to one embodiment, the cylindrical hollow shim 152 may be a screw hollow shim. That is, an outer portion of the cylindrical hollow shim 152 may enter the bolt accommodation hole (not shown) through screw rotation, and bolt 112 passing through bolt hole 111 may enter an inner portion of the cylindrical hollow shim 152 through screw rotation.
Due to such a dual structure, even when the noise prevention device 150 connects between the axle and the drum brake, the coupling structure may be more rigidly formed.
According to another embodiment, a noise prevention device 150 may include a circular damping shim 151 including at least one connecting hole (not shown). Accordingly, a bolt hole 111 of an axle flange 110 and a bolt 112 passing through the connecting hole (not shown) may enter or may be inserted into a bolt accommodation hole (not shown) of a brake drum 200. That is, the circular damping shim 151 may be formed to have only at least one connecting hole (not shown).
The number of bolts 112, the number of bolt holes 111, the number of connecting holes (not shown), the number of cylindrical hollow shims 152, and the number of bolt accommodation holes may be the same.
Referring to
The noise prevention device 150 may include a circular damping shim 151 including at least one connecting hole (not shown), and at least one cylindrical hollow shim 152 which may enter at least one bolt accommodation hole (not shown). The at least one cylindrical hollow shim 152 may be coupled to the at least one connecting hole (not shown).
According to one embodiment, the circular damping shim 151 may be formed of a metal layer.
According to one embodiment, the circular damping shim 151 may be formed of a metal layer and a rubber layer.
According to one embodiment, the circular damping shim 151 may be formed of a metal layer of which two surfaces are coated with rubber.
According to one embodiment, the circular damping shim 151 may be formed of a metal layer, a rubber layer, and a bonding layer.
According to one embodiment, a thickness of the metal layer may be in the range of 0.6 mm to 1 mm.
According to one embodiment, a thickness of the rubber layer may be in the range of 0.2 mm to 0.4 mm.
Referring to
According to one embodiment, the noise prevention device 150 may further include at least one cylindrical hollow shim 152 which may be coupled to the at least one connecting hole (not shown).
According to one embodiment, the circular damping shim 151 may be formed of a metal layer.
According to one embodiment, the circular damping shim 151 may be formed of a metal layer and a rubber layer.
According to one embodiment, the circular damping shim 151 may be formed of a metal layer of which two surfaces are coated with rubber.
According to one embodiment, the circular damping shim 151 may be formed of a metal layer, a rubber layer, and a bonding layer.
According to one embodiment, a thickness of the metal layer may be in the range of 0.6 mm to 1 mm.
According to one embodiment, the thickness of the rubber layer may be in the range of 0.2 mm to 0.4 mm.
According to one embodiment, the cylindrical hollow shim 152 may be a screw hollow shim. That is, an outer portion of the cylindrical hollow shim 152 may enter the bolt accommodation hole (not shown) through screw rotation, and bolt 112 passing through bolt hole 111 may enter an inner portion of the cylindrical hollow shim 152.
Due to such a dual structure, even when the noise prevention device 150 connects between an axle and a drum brake, a coupling structure may be more rigidly formed.
According to one aspect of the disclosure, a drum brake capable of separating vibrations of an axle component and a drum brake component and a noise prevention device of the drum brake can be provided.
Accordingly, the drum brake and the noise prevention device of the drum brake can prevent squeal noise.
The above description is only an example describing the technical spirit of the present disclosure, and various changes, modifications, and replacements may be made by those skilled in the art without departing from the essential characteristics of the present disclosure. Therefore, the embodiments disclosed in the present disclosure are considered in a descriptive sense only and not for purposes of limitation, and the scope of the disclosure is not limited by the embodiments. It should be interpreted that the scope of the disclosure is defined by the appended claims and encompasses all modifications and equivalents that fall within the scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102023205052.8 | May 2023 | DE | national |
