A yoke shaft

Abstract

The invention relates to a yoke shaft. The invention particularly relates to a yoke shaft with recessed lower ear surface and inner ear surface to be used in the driveshaft sliding group assembly.

Description

[0001] A YOKE SHAFT

[0002] Field of the Invention

[0003] The invention relates to a yoke shaft.

[0004] The invention particularly relates to a yoke shaft with recessed lower ear surface and inner ear surface to be used in the driveshaft sliding group assembly.

[0005] State of the Art

[0006] The driveshaft sliding assembly provides axial sliding motion at different lengths according to the underbody layout between the gearbox, differential and two axles. A driveshaft is a drivetrain component that transmits power from a vehicle's transmission or transfer case to the wheels. The driveshaft has a part at each end called a flange yoke, which is usually a yoked structure. With this part, the driveshaft is connected to the transmission or transfer case at one end and to the differential at the other end. The term “yoke shaft” refers to the fact that the part is in yoke form and also has a design that can slide back and forth on a surface.

[0007] The die forging method is mostly used in the production stages of yoke shafts. The forging method is referred to as vertical forging and horizontal forging, depending on the position in which the forged part is removed from the mold vertically or horizontally. While short yoke shafts can be forged vertically, long yoke shafts can only be forged horizontally due to the difficulty of shaping. In the state of the art, in the short yoke shafts, since the parts can be forged in vertical form, a weight-reducing form can be applied on the lower ear surface and inner ear surface in order to reduce the weight of the part and facilitate machining. However, when necessary, if the yoke shaft part is designed to be long, it is forged in horizontal form instead of vertical form due to its long length and is produced in solid form because the part is positioned horizontally. This causes the weight reduction advantage not to be achieved.

[0008] Figure 1 shows the yoke shaft (20) of the prior art. By forging in vertical form on the yoke shaft (20) of the prior art, the weight-reducing form cannot be obtained on the lower and inner surfaces of the ears (21 ). Thus, these regions remain as the inner ear surface filled form (211 ) and the lower ear surface filled form (212). As a result of the research done on the subject, CN106040944B has been found. In the relevant application, a mold structure is described to produce yoke shafts, but there is no explanation about the weight-reducing forms on the inner and lower ear surfaces.

[0009] As a result, due to the abovementioned disadvantages and the insufficiency of the current solutions regarding the subject matter, a development is required to be made in the relevant technical field.

[0010] Object of the Invention

[0011] The present invention aims to solve the abovementioned disadvantages by being inspired by the current conditions.

[0012] An object of the invention is to make the lower and inner ear surfaces of the yoke shaft forging part suitable for horizontal forging production.

[0013] Another object of the invention is to provide advantages in terms of weight-reducing form and weight, as in the yoke shafts forged in vertical form.

[0014] In order to fulfill the objectives described above, a yoke shaft with recessed lower ear surface and inner ear surface used for connecting one end of sliding assembly, which transmits the rotational movement on one side of the driveshaft to the other side, with flange yoke, which transmits power by connecting the end of the driveshaft with other parts, comprising:

[0015] • opposing ears, which form a structure in the form of the letter U when they come together at the end side which is not connected to the sliding assembly, and o inner ear surface weight-reducing forms created by recessing the inner surface of the ears, o lower ear surface weight-reducing forms created by recessing the outer surface of the ears, in order ensure that the yoke shaft is suitable for horizontal form forging production.

[0016] The structural and characteristic features of the present invention will be understood clearly by the following figures and the detailed description made with reference to these drawings and therefore the evaluation shall be made by taking these figures and the detailed description into consideration.

[0017] Figures for Understanding of the Invention

[0018] Figure 1 shows the prior art yoke shaft.

[0019] Figure 2 shows the usage area of the yoke shaft that is the subject of the invention.

[0020] Figure 3 shows the yoke shaft that is the subject of the invention.

[0021] Description of the Part References

[0022] 10 Yoke shaft

[0023] 1 1 Ear

[0024] 1 11 Inner ear surface weight-reducing form

[0025] 1 12 Lower ear surface weight-reducing form

[0026] 12 Rib

[0027] 20 Prior art yoke shaft

[0028] 21 Prior art ear

[0029] 211 Inner ear surface filled form

[0030] 212 Lower ear surface filled form

[0031] 30 Sliding assembly

[0032] 40 Flange yoke

[0033] Detailed Description of the Invention

[0034] In this detailed description, the preferred embodiments of the yoke shaft (10) of the present invention are described by means of examples only for clarifying the subject matter.

[0035] As shown in Figure 2, the inventive yoke shaft (10) is used by connecting one end of the sliding assembly (30), which transmits the rotational movement on one side of the driveshaft to the other side, with the flange yoke (40), which transmits the power by connecting the end of the driveshaft with other parts.

[0036] Figure 3 shows the details of the yoke shaft (10) subjected to the invention. At the end of the yoke shaft (10), which is not connected to the sliding assembly (30), there are opposing ears (1 1 ) that form a structure in the shape of the letter U when they come together. The yoke shaft (10) is obtained by horizontal forging and acts as a slider on the sliding assembly (30) after machining operations.

[0037] The ears (1 1 ) of the yoke shaft (10) are provided with inner ear surface weight-reducing forms (11 1 ) on the inner side of the ear and lower ear surface weight-reducing forms (112) on the outer side of the ear. Inner ear surface weight-reducing forms (1 11 ) and lower ear surface weight-reducing forms (1 12) are forms created during forging and molding.

[0038] Inner ear surface weight-reducing forms (1 11 ) are formed in areas close to the upper side of the inner surface of the ears (1 1 ). The lower ear surface weight-reducing forms (1 12) are formed in two parts, one on the right and one on the left, separated by a rib (12) near the lower sides of the outer surface of the ears (1 1 ), said rib (12) symmetrically dividing the lower ear surface weightreducing forms (112).

Claims

CLAIMS1. A yoke shaft (10) with recessed lower ear surface and inner ear surface used for connecting one end of sliding assembly (30), which transmits the rotational movement on one side of the driveshaft to the other side, with flange yoke (40), which transmits power by connecting the end of the driveshaft with other parts, characterized by comprising:• opposing ears (11 ), which form a structure in the form of the letter U when they come together at the end side which is not connected to the sliding assembly (30), and o inner ear surface weight-reducing forms (1 11 ) created by recessing the inner surface of the ears (11 ), o lower ear surface weight-reducing forms (112) created by recessing the outer surface of the ears (1 1 ), in order ensure that the yoke shaft (10) is suitable for horizontal form forging production.

2. The yoke shaft (10) according to claim 1 , characterized in that; the inner ear surface weight-reducing forms (111 ) are formed in areas close to the upper side of the inner surface of the ears (1 1 ).

3. The yoke shaft (10) according to claim 1 or 2, characterized in that; the lower ear surface weight-reducing forms (1 12) are formed in areas close to the lower side of the outer surface of the ears (11 ).

4. The yoke shaft (10) according to any of the preceding claims, characterized by comprising a rib (12) formed between the lower ear surface weight-reducing forms (112) so as to symmetrically separate the lower ear surface weight-reducing forms (112) from each other so that they are in two portions, one on the right and one on the left.

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