FIELD OF THE INVENTION

The present invention relates to cylindrical vibration dampers arranged to dampen vibration by placing them into the tubes of the cardan shafts .

PRIOR ART

Cardan shafts are the mechanical power transmission elements used in moving a vehicle by receiving the rotational movement and power generated in the engine in motor vehicles and transmitting the same to the differential of the vehicle. Axial and radial vibrations that occur during real time operation (engine, drivetrain or road conditions, etc) is also affected to the tubes between the joints of the cardan shafts that provide power transmission.

Said radial and axial vibrations both cause noise and cause problems related to resistance when the frequency spectrum reaches the resonance range of the said cardan shaft.

Vibration dampers are located inside the cardan shaft tubes so as to dampen these harmful vibrations. Vibration dampers are structures that contain a center point weight in a cylindrical slot and flexible damping elements between the weight and the slot, usually vulcanized to the center point weight. The flexibility provided by said rubber ensures most of the vibration to be dampened.

Different types and modes of vibrations occur on the drivetrain of different vehicle types and models and this requires vibration dampers with stiffness and mass weight configured according to specific vibration for each type. For this reason, even with minor changes in cardan shaft design, the mass and stiffness of the vibration damper should be reconsidered and fine-tuned with a suitable damper design according to the new cardan shaft application.

In a vibration damper described in publication numbered W02003062664A1 , a solution has been proposed for arranging the surface of the rubber damper in a curved manner and adjusting the stiffness based on the amount of this curve However, in said solution, it is required to arrange damping elements with appropriate curve and to make special designs for different situations.

As a result, all abovementioned problems have made it necessary to make an improvement in the relevant technical field.

AIM OF THE INVENTION

The present invention aims to eliminate the abovementioned problems and to make a development in the relevant technical field.

The main aim of the invention is to provide a cylindrical vibration damper arranged to dampen vibration by placing them into the tubes of the cardan shafts

Another aim of the invention is to provide a vibration damper structure wherein different stiffness values are easily provided.

Another aim of the invention is to provide a vibration damper structure wherein the total weight can be easily adjusted.

BRIEF DESCRIPTION OF THE INVENTION

The invention is related to a vibration damper to be placed inside the cylindrical tubes to dampen the vibration so as to fulfill all aims mentioned above and will be obtained from the following detailed description. Accordingly said vibration damper comprises; a mass inside said outer body; multiple holding group comprising at least one inner holding element extending from the outer body to the mass and at least one outer holding element extending from the mass to the outer body; multiple damping elements, which are connected to a holding group to dampen the vibration in the tube and regulate the stiffness of the vibration damper according to the number of uses.

Therefore, the stiffness of the vibration damper is determined by the number of damping elements used, and thus the vibration damper can be easily configured according to different requirements.

In another preferred embodiment of the invention, said inner and/or outer holding element comprises a tab and a counter tab which engages said damping element tab and provides fixation. In a preferred embodiment of the invention, said tab and/or counter tab are arranged to extend in opposite axial directions.

In a preferred embodiment of the invention, said inner and outer holding elements are arranged such that they extend in opposite radial extensions.

Another preferred embodiment of the invention comprises two holding groups such that one performs fixation from the front of the damping element and the other from the rear part of the damping element, according to the axial direction so as to connect each damping element.

In a preferred embodiment of the invention, said outer body is covered with rubber.

In a preferred embodiment of the invention, said inner and/or outer holding element is a slot.

In a preferred embodiment of the invention, said slot extends in the axial direction.

In a preferred embodiment of the invention, said damping elements are arranged to fit into the slots.

In a preferred embodiment of the invention, it comprises an inner body in which the mass is placed.

In a preferred embodiment of the invention, said inner body is provided in a cylindrical shape.

In a preferred embodiment of the invention, said inner holding element is provided on the inner body outer surface.

In a preferred embodiment of the invention, said inner holding element is provided integrally with the inner body.

In a preferred embodiment of the invention, the inner body includes at least one mass holding member for fixing the mass.

In a preferred embodiment of the invention, said mass holding element comprises a tab and a mass holding tab which provides fixation by engaging said mass on the tab.

In a preferred embodiment of the invention, said inner body is covered with rubber. BRIEF DESCRIPTION OF DRAWINGS

In Figure 1 , a representative isometric view of an embodiment of the inventive vibration damper is given.

In Figure 2, an isometric view showing the assembly of the damping elements is given.

In Figure 2. A, an isometric view showing the assembly of the mass is given.

In Figure 3, the front view of a preferred embodiment of the inventive vibration damper is given.

In Figure 3.A, the section view of the embodiment in Figure 3 according to the A axis is given.

In Figure 4, an isometric view showing the assembly of the damping elements in an alternative embodiment is given.

In Figure 5, a side view of an alternative damping element is given.

In Figure 5. A, a side view of another alternative damping element is given.

In Figure 5.B, a side view of another alternative damping element is given.

In Figure 4, a preferred embodiment of the inventive vibration damper is given such that its cross-section can be seen in a tube.

The figures are not required to be scaled and the details which are not necessary for understanding the present invention may be neglected. Moreover, the elements that are at least substantially identical or have at least substantially identical functions are shown by the same number.

DESCRIPTION OF THE REFERENCES IN FIGURES

1. Vibration damper

10. Outer Body 11. Outer retaining element 111. Tab 20. Inner body 21. Inner holding element 22. Mass holding element 221. Mass holding tab 30. Damping element

31. Counter tab

32. Opening

33. Discharge 40. Bulk

41. Mass housing 411. Mass holding tab TG. Holding group B. Tube

R. Radial direction B. Axial direction

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the inventive vibration damper (1) is described by means of examples only for clarifying the subject matter such that no limiting effect is created.

The present invention relates to cylindrical vibration dampers arranged to dampen vibration by placing them into the tubes of the cardan shafts

A vibration damper (1) to be placed inside the cylindrical tubes (B) to dampen the vibration, characterized in that, it mainly comprises the following; an outer body (10) in the form of cylindrical tube (B); a mass (40) inside said outer body (10); multiple holding group (TG) comprising at least one inner holding member (11 ) extending from the outer body (10) to the mass (40) and at least one outer holding member (21) extending from the mass (40) to the outer body (10); multiple damping elements (30) that are connected to a holding group (TG) to dampen the vibration in the tube (B) and regulate the stiffness of the vibration damper (1) according to the number of uses.

Said vibration damper (1) is especially configured for cardan shaft tubes (B). The term “multiple” refers to at least two elements. With reference to Figure 1 and 2; the inventive vibration damper (1) comprises an outer body (10). The outer body (10) is in a cylindrical tubular form according to the form of said tube (B). Preferably, the surface of the outer body (10) is coated with an elastomer, preferably rubber. The outer body (10) is preferably rigid.

A mass (40) is positioned inside said outer body (10). Said mass (40) is preferably in a cylindrical geometric form and is placed coaxially with the outer body (40).

It comprises an outer holding element (11 ) and an inner holding element (21 ), extending from the outer body (10) to the mass (40), from the mass (40) to the inner body (10), respectively. Here, a structure that comprises an outer and an inner holding element (11 , 12) and arranged to fix a damping element (30) is called holding group (TG). As can be seen in Figure 3.A, a plurality of holding group (TG) can be provided so as to fix a damping element (30). This fixation can be provided from the back and front of the damping element (30).

The outer holding elements (11 ) are preferably provided integrally with the outer body (10).

The outer holder elements (11 ) are preferably arranged to extend in the radial direction (R), the inner holding element (21 ) forming a holder group (TG) with said outer holding element (11) can be arranged to extend in the radial direction (R) to the outer holder element (11 ). Said holding group (TG) is especially arranged to prevent the damping element (30) from moving in the axial direction.

Here, the damping elements (30) can be attached to the vibration damper, holding groups (TG) in varying numbers depending on the required stiffness. After said vibration damper is produced, it is possible to provide stiffness so as to meet different requirements by placing different number of damping elements (30) in the holding groups (TG) by eliminating the need for a new design for every different requirement. In the inventive structure, the damping elements (30) are connected to the outer body (10), mass (40) or to the inner body (20) described later without using vulcanization and similar permanent engaging methods and are fixed in an attachable and detachable manner by means of the holding groups (TG).

Said holding groups (TG) can be provided with equiangular spacing with respect to the outer body (10). In the embodiment shown in Figures 1-3, the vibration damper (1 ) is provided with 8 holding groups (TG) to form 45° angles. It is possible to provide said technical benefit by using holding groups (TG) arranged in different numbers and angular spacing. For example, the present invention can be provided with 2, 3, 4, 5, 6, 7, 8 or more holding groups (TG).

With reference to Figures 3 and 3. A; the outer holding element (11 ) extends into the mass (40) in the radial direction (R). A tab (111 ) that extends in an axial direction (E) is arranged at the end of the outer holding element (11). Likewise, the inner holding element (11 ) extends to the mass (40) in the radial direction (R) and a tab (111 ) that extends in an axial direction (E) is arranged at the end of the inner holding element (11 ).

The damping elements (30) comprise counter tabs (31 ) that extend in the opposite direction to said tabs (111 ). The counter tabs (311 ) fit into the section formed between the part of the outer and inner holding element (11 , 21 ) extending in the radial direction (R) and the tabs (111) extending in the axial direction (E) and thus this ensures the damping element (30) to be easily connected to the holding group (TG) formed by the inner and outer and holding elements (11 , 21).

Said damping element (30) is preferably made of elastomer material, particularly made of rubber. Besides, the damping element (30) is preferably arranged to provide a rectangular prism geometry extending in the axial direction. Abovementioned counter tabs (311 ) can be provided at the corners.

With reference to Figure 4, at least one inner holding member (11 ) extending from the outer body (10) to the mass (40) and at least one outer holding member (21 ) extending from the mass (40) to the outer body (10) are arranged as a slot. Herein, the inner holding element (11 ) is arranged on the outer surface of the mass (40), and the outer holding element (12) is arranged on the inner surface of the outer body (10).

In one embodiment, said slot is formed such that it extends in the axial direction and forms a channel therein. As seen in Figure 4, said damping element (30) can be arranged to fit directly into the slots, it can also contain an extension that is only arranged to fit inside the slot.

Besides, the slot can also have a recess that extends in the radial direction and in this case, there may be a further extension on the damping elements (30) so as to fit into this recess. Referring to Figures 1 -3; the inventive vibration damper (1) comprises an inner body (20). Said inner body (20) is preferably in the form of a cylindrical tube and is positioned coaxially to the inner part of the outer body (10). The damping elements (30) that are arranged between the outer body (10) and the mass (40) are arranged so as to hold the mass (40) coaxially. The inner body (20) is arranged to form a slot for the mass (40). Preferably, the surface of the inner body (20) is coated with an elastomer, preferably rubber. The inner body (20) is preferably rigid.

The inner holding elements (21 ) can be arranged to extend from the surface of the inner body (20) to the outer body (10).

Furthermore, the outer holding elements (21) shown on the surface of the mass (40) in Figure 4 can also be formed on the inner body surface.

Preferably, the inner holding element (21 ) and the inner body (20) are provided integrally. Furthermore, the inner holding elements (21 ) can also be provided to the inner body (20) in an attachable and detachable manner.

In an embodiment of the invention, the inner holding elements (21 ) can be provided on the mass surface (40) preferably extending in the radial direction (R). In this embodiment, the mass (40) and the damping element (30) hold each other.

In another embodiment of the invention, the inner body (20) comprises mass holding elements (22) The mass holding elements (22) enable the mass (40) to be easily attached to and detached from the inner body (20). Flere, the mass (40) is connected to the inner body (20) without using vulcanization and similar permanent engaging methods and is fixed in an attachable and detachable manner by means of the holding groups (TG). Thus, masses (40) of different weights are connected to the vibration damper (1).

The mass holding element (22) extends to the mass (40) in the radial direction (R) towards the center. A tab (111 ) that extends in an axial direction (E) is arranged at the end of the mass holding element (22). A slot (41 ) where said tab will be placed is arranged on the surface of the mass (40).

A mass holding tab (411) is arranged in the slot (41 ) that extends in the axial direction (E). Said mass holding tab (411 ) fits into the section between the part of the mass holding element (22) extending in the radial direction (R) and the tabs (111 ) extending in the axial direction (E) and thus it enables the mass (40) to be easily connected to the inner body (20). In said vibration damper (1), damping elements (30) with different flexibility and/or geometry can be used. Some alternatives of the damping elements (30) are shown in Figures 5-5. B. In Figure 5, many square formed openings (32) are provided on the damping element (30), thus its stiffness is reduced. In Figure 5. A, larger circular openings (32) are arranged on the damping element (30). In Figure 5.B, curved discharges (33) are provided at the edges of the damping elements instead of the openings (32). Flerein, openings (32) and discharges (33) can not only be used together, but also they can be provided in different geometries.

Vibration damper (1) is configured inside a cardan shaft tube (B) in such a way that the surface contacts the surface, as seen in Figure 6. The protection scope of the invention is specified in the appended claims and cannot be limited to the description made for illustrative purposes in this detailed description. Likewise, it is clear that a person skilled in the art can present similar embodiments in the light of the above descriptions without departing from the main theme of the invention.