DE202017000746U1 - Cardan shaft with balancing weights and fixed in pipe fork and tube sleeve extension - Google Patents

Abstract

Cardan shaft (10) which prevents vibrations and related technical problems on a pipe fork (3) or a pipe sleeve (7) by means of a balance weight (2) attached to a pipe (1), characterized in that: - the pipe fork (3) or pipe sleeve (7) has an elongated projection (3.1) at the end of the pipe fork (3) or the pipe sleeve (7) and the balancing weight (2) on the extended surface of a flat portion of the pipe fork (3) or the tube sleeve (7) is fixed without being positioned on the tube (1).

Description

Technical area

The invention relates to balance weights which are attached to a pipe to prevent vibrations and related technical problems on the pipe fork, the pipe sleeve and the tube of the propeller shaft.

In particular, the invention relates to balancing weights, which are fixed here by the extension of the direct tube fork or stirring tube by connecting it to the tube without being positioned on the tube.

State of the art

In vehicles, elements called a propshaft are used to transmit torque and rotation from the output shaft of the transmission to the wheels through the differential and differential gears. The universal joints allow the propeller shaft to move from the transmission housing to the other transmission components and provide the connection.

The cardan shaft is usually made of high-grade steel and can be reinforced with rubber dampers against torsional or torsional vibrations. The parts containing the combined parts of the cardan shaft are connected to the end of the tube by welding. The cardan shaft must be well balanced so that it is not affected by vibrations. The propshaft must be balanced to withstand centrifugal forces that occur during shaft rotation.

Any point of the propeller shaft that rotates about an axis is not equal to the axis of rotation. This causes the formation of centrifugal forces during rotation. The weight is removed or added over the shaft or equipment parts to avoid this situation, which causes errors such as vibration.

Balancing weights are used for this process called balancing. Balancing weights are the parts of a sheet of different weights, geometries and dimensions welded to the pipe. These parts are welded to non-balanced regions for compensation with respect to the axis of rotation.

In existing applications, near the weld and the weld areas are heat affected areas, HAZ (Heat-Affected Zone), d. H. weak regions that break. Cracks that occur in these areas during use will cause irregularities and breakage. Due to these thermal effects, the life of the cardan shaft is shorter than the expected life and it can experience low-cycle breakage or low-cycle breakage.

A patent search for a cardan shaft has a patent with the reference number WO9736158 result. The invention is a method for correcting the balancing of the propeller shaft of a vehicle. Disclosed is a method for balancing a propshaft of a vehicle with a forked shaft having interlocking male and female grooves and first and second links connected to the first and second support members of the vehicle. Balance parts on the cardan shaft are welded to ensure balance. Deformation on the propshaft occurs due to the welding process. This deformation can be the beginning of breaking under load. However, there is no use in the prior art to extend the life of the propeller shaft by modifying the parts.

The EP0015640A1 relates to a balancing weight which is attached to the cardan shaft by bonding technique. The balancing weight consists of layers which comprise adhesive surfaces and a protective layer which protects these adhesive surfaces. Any change in position by modifying the parts in the same way does not imply any improvement in the lifetime of the propshaft.

The EP1710468A1 relates to a balancing weight which is adapted to the propshaft tube via a fixing pin. Both of the above-mentioned patent applications are concerned with attaching balancing parts to the prop shaft by different techniques.

As a result, it is necessary to improve the balancing quality of the propeller shaft and to overcome the above-mentioned disadvantages as well as to replace the existing technique. To our understanding, the improvement of the balancing quality of the cardan shaft is achieved by extending the life of the cardan shaft.

Disclosure of the invention

It is the object of the invention to avoid welding errors on the propeller shaft and to prevent breakage of the cardan shaft due to the welding process.

It is another object of the invention to reduce the effect of heat on the region, where the balancing weight is welded to provide a minimum.

It is a further object of the invention to extend the life of the cardan shaft by changing the position of the balance weight on the propeller shaft tube.

It is another object of the invention to provide balance quality.

It is a further object of the invention to extend the life of the cardan shaft due to improved balance quality.

In order to accomplish the above objects, the balance weight is welded to the extended surface of the propeller shaft or pipe fork to provide balance of the propeller shafts to vehicles. Pipe sleeve and pipe fork are extended according to the balancing weight length.

Also disclosed is a method of placing the balance weight in the propshaft used in vehicles. This method includes the step of forming a weld surface on the propeller shaft and connecting the balance weight to the weld surface by welding.

Figures for a better understanding of the invention

1 Figure 3 is the perspective view showing the balance weight placed on the pipe, in the prior art;

2 : is the view showing the balance weight placed on the extended face of the pipe fork, as mentioned in our invention,

3 is the view showing the balance weight placed on the protective cover, in the prior art,

4 : is the view that the balance weight on the compressed pipe or

Crimp tube placed shows, in the prior art,

5 : is the view showing the balance weight placed on the elongated surface of the tube sleeve, as mentioned in our invention,

LIST OF REFERENCE NUMBERS

1

pipe

2

balance weight

3

pipe fork

3.1

renewal

4

center bearing

5

fork shaft

6

protective cover

7

tubular sleeve

8th

upset tube or crimp tube

9

welding surface

10

propeller shaft

Detailed description of the invention

The invention relates to the attachment of balancing weights ( 2 ) attached to the pipe ( 1 ) on the extended equipment or parts of the equipment in order to avoid vibrations and related technical problems 3 ), the tube sleeve ( 7 ) and the pipe ( 1 ) to prevent. Each point of the cardan shaft ( 10 ) rotating about an axis is not equal to the axis of rotation. This causes the formation of centrifugal forces during rotation. The balance weights ( 2 ) are attached to the pipe ( 1 ) and the compressed raw or crimping tube ( 8th ) in order to avoid this situation, which causes errors such as vibrations in the prior art.

A novelty feature of the invention is the positioning of the balance weight ( 2 ) on the pipe fork ( 3 ) or the tube sleeve ( 7 ), which is an extension ( 3.1 ) from the flat zone of the pipe fork ( 3 ) or tube sleeve ( 7 ) and without as in the existing art on the pipe ( 1 ) to be positioned.

1 shows a view of the cardan shaft ( 10 ) of the prior art; The balancing weight ( 2 ) located on the pipe ( 1 ), is subject to changes that can lead to heat differences or temperature differences and negative consequences in the weld zone after welding. The pipe ( 1 ) is the bore or the drill hole of the cardan shaft. The pipe ( 1 ) is the part of the prior art where the balance weight is located. The balancing weight ( 2 ) is the weight-bearing part, the imbalances on the cardan shaft ( 10 ) compensates. The pipe fork ( 3 ) is one of the parts passing through the pipe ( 1 ) are to be welded. The center bearing ( 4 ) are vibration dampers attached to the cardan shaft ( 10 ) are mounted and freedom of movement of the propeller shaft ( 10 ) Offer. The fork shaft ( 5 ) is the part to which the protective cover ( 6 ) is welded together. The protective cover ( 6 ) is an element that protects the sliding group from external influences. The tube sleeve ( 7 ) is the groove element having the spline shape of the sliding group.

2 shows a detailed perspective view of the propeller shaft ( 10 ). In this case, the pipe fork ( 3 ) an extension ( 3.1 ) extending from its flat zone. The position of the balance weight ( 2 ) is at the extension ( 3.1 ) extending from the flat region of the pipe fork ( 3 ), as it is in 1 is shown.

3 shows a view of another version of the cardan shaft ( 10 ) of the prior art. As can be seen in the prior art, the balancing weight ( 2 ) on the compressed pipe ( 8th ) and then welded.

In 4 in the prior art, the view of the balance weight ( 2 ) shown on the compressed tube ( 8th ) is attached.

In 5 in the embodiment according to the invention, the balancing weight ( 2 ) at the projecting extension ( 3.1 ) of the flat zone of the tubular sleeve ( 7 ) attached. This advantage is achieved by welding the balancing plate ( 2 ) to the extension ( 3.1 ) of the tube sleeve ( 7 ) from the flat axis of the tubular sleeve ( 7 ) achieved.

The new positioning range of the balance weight ( 2 ), a pipe fork ( 3 ) or a tube sleeve ( 7 ) with an extension ( 3.1 ) be. So that the balancing weight ( 2 ) on the pipe fork ( 3 ) or the tube sleeve ( 7 ), allows or alters the part geometry of this. Likewise, this improves the balancing quality.

With the new position of the invention, the number of cycles of the fatigue life of the propeller shaft is increased, i. H. the life is extended. The heat affected zone (HAZ) during welding is minimized. This process is called balancing. The balance weights of the present invention are added by welding to stabilize the unbalanced regions with respect to the axis of rotation.

The invention thus relates to a cardan shaft ( 10 ) comprising a balancing piece ( 2 ), attached to a pipe ( 1 ), to prevent vibrations and related technical problems at the pipe fork ( 3 ), the tube sleeve ( 7 ) and the pipe ( 1 ) or the tube sleeve ( 7 ), which has an extended lead ( 3.1 ) at a distance from the flat zone of the pipe fork ( 3 ) or sliding region of the tube sleeve ( 7 ), and a direct tubular sleeve ( 3 ) or sliding sleeve ( 7 ), without touching the pipe ( 1 ) to be positioned in the extension ( 3.1 ) of the flat part is fixed.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 9736158 [0008]
• EP 0015640 A1 [0009]
• EP 1710468 A1 [0010]

Claims (2)

Cardan shaft ( 10 ), the vibrations and related technical problems on a pipe fork ( 3 ) or a tube sleeve ( 7 ) by means of a balance weight ( 2 ) prevents this from happening on a pipe ( 1 ), characterized in that: - the pipe fork ( 3 ) or tube sleeve ( 7 ) an extended projection ( 3.1 ) at the end of the pipe fork ( 3 ) or the tube sleeve ( 7 ) and - the balancing weight ( 2 ) on the extended surface of a flat portion of the pipe fork ( 3 ) or the tube sleeve ( 7 ) is attached, without on the pipe ( 1 ) to be positioned. Cardan shaft ( 10 ) according to claim 1, characterized in that the balancing weight ( 2 ) on the extension of the pipe fork ( 3 ) or tube sleeve ( 7 ) is fixed by welding technology ( 2 ).

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