A PROTECTIVE COVER THAT CAN BE MOUNTED ON THE YOKE SHAFT IN DIFFERENT SIZE ON THE CARDAN SHAFT

TECHNICAL FIELD

The invention relates to a cardan shaft, which is an element ofpower train on motor vehicles.

The invention particularly relates to a protective cover which can be integrated into constructions of different diameters of the yoke shaft, which is a sliding component compensating the length of the cardan shaft during the movement of the vehicle.

STATE OF THE ART

The cardan shaft is the intermediate element that transfers the torque from the engine to the differential. While the vehicle is travelling, the rear axle moves up and down due to the effects of the road condition. This case constantly changes the distance between the engine and the differential. For this reason, the length of the cardan shaft must be lengthened or shortened. However, since cardan shafts are not made of elastic material, it is impossible for them to lengthen or shorten. For this reason, the need for change in the length of the cardan shaft is provided with the help of a sliding joint.

A sliding assembly is formed by assembly of tube sleeve and yoke shaft. The sliding assembly is also sealed with protective cover and seal application.

In the present technique, the size of the protective cover of the cardan shaft varies. The size of the protective cover that fits the yoke shaft diameter determined according to the design inputs is not always in accordance with the tube dimensions specified in the standard.

In the current technique, there is a supply shortage and quality - related problems in special production tube sizes (other than the sizes specified in the standard) for the tube sizes required for the production of the protective cover, especially in new generation heavy commercial vehicle platforms.

In addition, in the current technique, there are problems of dislocation of the seal mounted on the seal fitting diameter obtained by the swelling method of the protective cover.

There are some patent applications in the literature research related to the protective cover of sliding assembly of cardan shaft. In the application DE10312050A1 found in the German patent literature, the cardan joint is assembled from a first shaft having internal threads and a second shaft, the external threads of which are to be moved along the threaded area in engagement with the internal threads on the first shaft. A sealing sleeve surrounds the connection area between the shafts. The sleeve is bent three times at one of its edges to provide a cavity for the insertion of a specially shaped elastic sealing ring comprising a circular groove and at least one sealing lip contacting the outer surface of the shaft.

The application DE10333227A1 found in the German patent literature, provides a sealing arrangement for a length compensating unit of a cardan joint shaft, comprising a plastic sealing sleeve comprising a connecting portion having circumferential grooves or a screw thread and a fixing end having a hole forced into the connecting portion.

The application RU2675097C1 found in the Russian patent literature relates to a sealing device for a balancing section of a cardan shaft, as well as to a cardan shaft having such a sealing device. The sealing device comprises a first shaft member comprising a sealing sleeve together with a landing section and a stabilising section. The landing section has a circumferential groove in which the sealing sleeve is engaged for fixing. The fastening section comprises at least one radially protruding inward fixing protrusion. This protrusion engages the circumferential groove with a locking connection when the sealing sleeve is fully inserted. The landing section includes the circumferential sealing surface on which the mounting sleeve of the sealing sleeve rests in elastic tension when fully inserted.

As a result, the existence of the above problems and the lack of an existing solution made it necessary to make a development in the relevant technical field.

AIM OF INVENTION

The invention aims to solve the above - mentioned problems, to eliminate all disadvantages and to bring additional advantages to the structure.

The main aim of the invention is to be used in yoke shaft designs as a result of shaping the tube diameter to be mounted on the yoke shaft in accordance with the desired diameters by swaging swaging or swelling swelling method, depending on the dimensions of the protective cover to be produced using the tube dimensions specified in the standard.

Another aim of the invention is, as an alternative to the runout problem that may occur on the protective cover as a result of the diameter swaging or swelling application, to take a small amount of chips from the tube diameter where the cover will be mounted on the yoke shaft. Another aim of the invention is, as an alternative application to the seal fitting diameter on the other side of the protective cover obtained by the swelling method, to apply an evenly spaced stacking process resulting in plastic deformation around the periphery in order to prevent the seal from coming out.

The invention is to fulfil the aforementioned purposes; the cardan shaft, which transfers the torque received from the engine to the differential, is related to a yoke shaft that compensates for the changing distance between the engine and the differential due to the effects of the road condition during the vehicle travel, a protective cover centered on the yoke shaft, a sliding assembly containing a sealing element that is positioned between the outer wall of the tube sleeve and the inner wall of the protective cover and has a seal fitting diameter at an swelling end of the protective cover and ensures sealing., wherein;

It is produced according to the tube dimensions specified in the standard, can be shaped in accordance with the desired diameters by swaging or swelling method at one end and can be used with a yoke shaft with different fitting diameters with this form, and in order to prevent dislocation of the sealing element, it contains a protective cover with a structure resulting from the stacking process resulting in plastic deformation at equal intervals circumferentially to the other end.

The structural and characteristic features, working principle and advantages of the invention will be more clearly understood by means of the figures given below and the detailed description written with references to these figures. Therefore, the evaluation should be made by taking these figures and detailed description into consideration.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1. Shows the cardan shaft as a whole.

Figure 2. shows cross sectional view of the the cardan shaft

Figure 3. shows the cross sectional view of the cardan shaft sliding assembly.

Figure 4. shows the cross sectional view of the cardan shaft sliding assembly in disassembly position.

Figure 5. shows the protective cover of the sliding assembly with a swaging or swelling form on one side, and the form on which the seal is mounted and also stacked.

REFERENCE NUMBERS 1 . Cardan shaft

10. Sliding assembly

11 . Yoke shaft

12. Tube sleeve

13. Protective cover

13a. Protective cover swaging form

13b. Protective cover swelling form

13c. Protective cover stacking form

13d. Protective cover seal fitting diameter

14. Sealing element

DETAILED DESCRIPTION OF THE INVENTION

The cardan shaft (1 ) is the intermediate element that transfers the torque received from the engine to the differential and has a sliding assembly (10) that compensates for the changing distance between the engine and the differential due to the effects of the rear axle and road during the vehicle travelling.

In order to fulfil this function, the sliding assembly (10) comprises a yoke shaft (11 ), tube sleeve (12), protective cover (13) and sealing element (14).

The yoke shaft (11) is a yoke structure that provides the connection between the engine and the differential.

The invention relates to the sliding assembly (10) includes protective cover (13) which can be shaped in accordance with the desired diameters (13a - 13b) by swaging or swelling method, a sealing element (14) which is positioned between the outer wall of the tube sleeve (12) and the inner wall of the protective cover (13), and which fixed on the protective cover seal fitting diameter (13d) at an swelled end of the protective cover, and which provides sealing. With this form, a protective cover stacking form (13c), which can be used with a yoke shaft (11) with different engagement diameters, was applied to the other end of the protective cover (13) to prevent the sealing element (14) from coming out, with a stacking process resulting in plastic deformation at equal intervals. The sealing element (14) is a structure which is positioned between the outer wall of the tube sleeve (12) and the inner wall of the protective cover (13), and which is on the protective cover seal fitting diameter (13d) at an swelling end of the protective cover (13) and ensures sealing. The sealing element (14) is a seal made of rubber material.