Dynamic damper for automobile driveshaft

Abstract

The present invention relates to a dynamic damper mounted on an automobile driveshaft and configured to be able to absorb vibrations. The dynamic damper comprises: an elastic support member configured to be installable on an automobile driveshaft and having a fastening portion for fastening to the driveshaft; and a mass member manufactured separately from the elastic support member and coupled to the elastic support member. The elastic support member is formed by blow molding.

Description

Dynamic damper for drive shaft of automobile

[0001] The present invention relates to a dynamic damper that is mounted on a drive shaft of an automobile and configured to absorb vibration.

[0002] The driveshaft is a component that transmits the vehicle's power and serves to transmit the driving force to the wheels. Typically, a constant velocity joint, which transmits rotational power, is installed on the driveshaft, and a dynamic damper is mounted on the driveshaft to reduce vibration and noise. For example, the driveshaft may be inserted into a ring-shaped dynamic damper, which is configured to dampen the vibration energy generated by the driveshaft.

[0003] Typically, a dynamic damper comprises a hollow cylindrical elastic support member that contacts the outer surface of a drive shaft, and a ring-shaped mass member inserted into the elastic support member. Typically, the elastic support member is formed of an elastic rubber material, and a mass member formed of a metal material such as iron is inserted into the elastic support member by injection molding. Such conventional dynamic dampers are designed to attenuate vibrations of a desired frequency by varying the shape and thickness of the elastic support member and the weight of the mass member. Accordingly, it is necessary to change the shape of the elastic support member and the thickness of each part depending on the drive shaft and vibration conditions.

[0004] Conventional dynamic dampers are formed by injection molding using a mass member, which necessitates a change in mold when the elastic support member needs to be replaced. Furthermore, the structure in which the mass member is inserted within the rubber damper complicates the manufacturing process and makes mass member replacement difficult.

[0005] The matters described in the technical background of this invention are written to enhance understanding of the background of the invention and may include matters that are not already known prior art in the field to which this technology belongs.

[0006] <Prior Art Literature>

[0007] - Republic of Korea Patent No. 10-17465788 (Published: June 13, 2017)

[0008] - Republic of Korea Patent No. 10-0283457 (Published: March 2, 2001)

[0009] The problem to be solved by the present invention is to provide a dynamic damper that is simple to manufacture and in which the mass member can be easily replaced depending on the vibration damping conditions.

[0010] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0011] A dynamic damper according to an embodiment of the present invention is configured to be installed on a drive shaft of an automobile, and includes an elastic support member having a fastening portion for fastening to the drive shaft, and a mass member manufactured separately from the elastic support member and coupled to the elastic support member. The elastic support member is formed by blow molding.

[0012] The above elastic support member may include a fastening portion for fastening with the drive shaft, a mounting portion on which the mass member is mounted, and a bridge connecting the fastening portion and the mounting portion.

[0013] The mass member may have a ring shape, and the mass member may be joined to the elastic support member by press-fitting.

[0014] The above elastic support member may further include support protrusions provided on both sides of the mounting portion so as to support both ends of the mass member mounted on the mounting portion. The support protrusions may be formed to have a diameter larger than the inner diameter of the ring-shaped mass member, and when the mass member is pressed in, the elastic member may be formed such that a portion including the support protrusions is deformed radially inward to enable the press-fitting of the mass member.

[0015] According to the present invention, since the elastic support member is manufactured by blow molding, the shape of the elastic support member, such as the thickness, can be changed without replacing the internal mold, so that the vibration damping characteristics can be easily changed.

[0016] Furthermore, since the mass member is manufactured separately from the elastic support member and then joined to the elastic support member by press fitting, it is possible to change the thickness of the mass member, etc. while maintaining the elastic support member as is.

[0017] In addition, various effects that can be obtained or expected due to embodiments of the present invention are disclosed directly or implicitly in the detailed description of the embodiments of the present invention.

[0018] The accompanying drawings, which are intended to aid in understanding the present invention, provide embodiments of the present invention along with a detailed description. However, the technical features of the present invention are not limited to any specific drawings, and the features disclosed in each drawing may be combined to form new embodiments. The embodiments of the present specification may be better understood by referring to the following description in conjunction with the accompanying drawings, in which similar reference numerals designate identical or functionally similar elements.

[0019] Fig. 1 is a perspective view of a dynamic damper according to an embodiment of the present invention.

[0020] Figure 2 is a cross-sectional view taken along line II-II of Figure 1.

[0021] Fig. 3 is a cross-sectional view showing an elastic support member and a mass member of a dynamic damper according to an embodiment of the present invention in a disassembled state.

[0022] FIG. 4 is a drawing for explaining the assembly process of an elastic support member and a mass member of a dynamic damper according to an embodiment of the present invention.

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the described embodiments.

[0024] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present invention. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the terms "comprises" and / or "comprising," as used herein, indicate the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. The term "coupled" indicates a physical relationship between two components in which the components are directly connected to one another or are indirectly connected through one or more intervening components.

[0025] When describing components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When a component is described as being "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected, coupled, or connected to the other component, but that another component may also be "connected," "coupled," or "connected" between each component.

[0026] Fig. 1 illustrates a perspective view of a dynamic damper (10) according to an embodiment of the present invention. The dynamic damper (10) is installed on a drive shaft, which is a power transmission member of an automobile, and performs functions such as vibration absorption and boom reduction. The dynamic damper (10) includes an elastic support member (11) and a mass member (13).

[0027] Referring to FIGS. 1 and 2, the elastic support member (11) has a substantially hollow tube shape to form a through hole (15) into which the drive shaft (1) is inserted. The elastic support member (11) may be formed of a plastic material to enable elastic deformation. As shown in a dotted line in FIG. 2, the drive shaft (1) may be installed to pass through the through hole (15) of the elastic support member (11).

[0028] The mass member (13) is fixed to a mounting portion (17) provided on the outer surface of the elastic support member (11). The mass member (13) may be formed of a metal material such as iron and may have a roughly ring shape so that the mounting portion (17) can be inserted.

[0029] The elastic support member (11) includes a fastening portion (19) having an inner diameter corresponding to the outer diameter of the drive shaft (1), and the seating portion (17) is formed to have a diameter larger than the fastening portion (19). As a result, the seating portion (17) supporting the mass member (13) can be maintained in a state spaced apart from the outer surface of the drive shaft (1). The elastic support member (11) may include a bridge (21) connecting the contact portion (19) and the seating portion (17) having different diameters, and as illustrated in FIG. 2, the bridge (21) may extend obliquely to connect one end of the fastening portion (19) and one end of the seating portion (17). At this time, a pair of fastening portions (19) may be provided and arranged on each side of the seating portion (17).

[0030] The mounting portion (17) may be provided with supporting projections (23) that protrude radially outwardly and support the ends of the mass member (13) in the longitudinal direction, respectively. Meanwhile, the fastening portion (19) may have a shape of a groove sunken radially inwardly, and a fastening means such as a clamp (not shown) may be fastened to the groove-shaped fastening portion (19), thereby fixing the elastic support member (11) to the drive shaft (1).

[0031] The elastic support member (11) of the dynamic damper (10) according to an embodiment of the present invention can be formed by blow molding using a plastic material. For example, the elastic support member (11) can be formed by blow molding using a thermoplastic elastomer (TPE) material. While the elastic support member of a conventional dynamic damper is mainly formed by injection molding using rubber, the elastic support member (11) according to an embodiment of the present invention is formed by blow molding using a plastic material. Since the elastic support member (11) according to an embodiment of the present invention is formed of a plastic material instead of a rubber material, it is particularly effective in absorbing high-frequency vibrations compared to an elastic support member made of a rubber material.

[0032] Furthermore, when forming an elastic support member by injection molding, in order to change the vibration frequency absorption characteristics according to changes in the vehicle type, environment, etc., it is essential to change the mold, especially the inner mold, and there is a problem that the development process is complicated and the manufacturing cost increases due to the need for a new mold. In contrast, in the embodiment of the present invention, since the elastic support member (11) is formed by blow molding, the shape or thickness of the elastic support member (11) can be adjusted by changing the blow conditions without replacing the mold, thereby simplifying the development process and reducing the manufacturing cost. In particular, when it is necessary to change the thickness of the bridge (21) that affects the change in the frequency characteristics, the thickness of the bridge (21) can be easily changed by changing the process conditions of the blow molding.

[0033] A ring-shaped mass member (13) is assembled by press-fitting into an elastic support member (11) manufactured by blow molding. In Fig. 3, the elastic support member (11) manufactured by blow molding and the separately manufactured mass member (13) are illustrated as being separated from each other, and the mass member (13) is moved in the direction of the arrow and assembled to the elastic support member (11) by press-fitting. At this time, the support protrusions (23) provided on both sides of the seating portion (17) of the elastic support member (11) protrude outward from the inner diameter of the mass member (13), and accordingly, during the press-fitting process of the mass member (13), the mass member (13) moves while pressing the inclined outer surface of the bridge (21), so that the portion including the protrusions (23) is deformed inward in the downward arrow direction shown in Fig. 4, thereby performing press-fitting. This structure allows for easy press-fitting of the mass member (13), and enables firm seating after press-fitting.

[0034] In this way, according to an embodiment of the present invention, since the mass member (13) is assembled by press-fitting into a separately manufactured elastic support member (11), when a change in the weight of the mass member (13) is required, it is possible to change only the thickness of the mass member (13) while using the same elastic support member (11), thereby making it possible to change the weight of the mass member (13) without changing the mold for manufacturing the elastic support member (11).

[0035] Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and includes all changes and modifications that can be easily modified by a person having ordinary skill in the art to which the present invention pertains and are recognized as equivalent.

Claims

1. In a dynamic damper configured to be installed on a drive shaft of an automobile, An elastic support member having a fastening portion for fastening to the above drive shaft, and A mass member manufactured separately from the elastic support member and coupled to the elastic support member is included. The above elastic support member is a dynamic damper formed by blow molding.

2. In paragraph 1, A dynamic damper in which the elastic support member includes a fastening portion for fastening with the drive shaft, a mounting portion on which the mass member is mounted, and a bridge connecting the fastening portion and the mounting portion.

3. In paragraph 2, The above mass member has a ring shape, A dynamic damper in which the mass member is joined to the elastic support member by press fitting.

4. In paragraph 3, The above elastic support member further includes support protrusions provided on both sides of the mounting portion so as to support both ends of the mass member mounted on the mounting portion, The above support protrusion is formed to have a diameter larger than the inner diameter of the ring-shaped mass member, A dynamic damper in which, when the mass member is pressed in, the elastic member is formed such that a portion including the support protrusion is deformed radially inward to enable pressing of the mass member.

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