Shaft-hub connection comprising hollow shaft, key and shaft having key groove, and method for producing shaft-hub connection

Abstract

The invention relates to a shaft-hub connection comprising a hollow shaft (2), a key (21) and a shaft (1) having a key groove, the hollow shaft having an inner groove, the key being inserted into the key groove and projecting radially into the inner groove of the hollow shaft, the key groove being filled only partially by means of the key, and a seal (20) being received in the key groove.

Description

Technical Field

[0001] The invention relates to a shaft-hub connection device comprising a hollow shaft, a key and a shaft with a keyway and a method for manufacturing the shaft-hub connection device. Background Art

[0002] As is known, in a shaft-hub connection, a shaft can be connected to a hollow shaft in a form-locking manner in the circumferential direction, for example, by means of a key connection. In particular, as the closest prior art, a shaft-hub connection is known from JP H05-209 607A.

[0003] A securing pin for a shaft coupling is known from US 2007 / 0 228 728 A1. Summary of the invention

[0004] It is therefore an object of the present invention to extend the service life of a shaft-hub connection.

[0005] According to the invention, this object is achieved by a shaft-hub connection according to the features of claim 1 and by a method according to the features of claim 15 .

[0006] In the case of a shaft-hub connection device comprising a hollow shaft, a key and a shaft with a keyway, an important feature of the present invention is that the hollow shaft has an internal groove,

[0007] The key is inserted into the keyway and protrudes radially into the inner groove of the hollow shaft.

[0008] The keyway is only partially filled with the key.

[0009] wherein the seal is received in the keyway,

[0010] In particular, the seal fills, in particular at least partially fills, the spatial region in the keyway which is not filled by the key.

[0011] The advantage here is that during cleaning, spray water cannot enter the keyway, because the seal seals the keyway towards the environment by arranging the seal between the shaft and the hollow shaft. In particular, the seal is at least partially inserted into the keyway, that is, in particular the retaining area of ​​the seal, and the base area radially protrudes from the shaft into the inner groove of the hollow shaft, so that the seal seals the inner groove protruding in the axial direction towards the shaft. For this purpose, the seal has a protruding lamella, in particular a sealing lip, on its base part, which lamellae contact the shaft and the hollow shaft respectively. The shaft is pressed into the hollow shaft with a sufficiently tight fit, in particular a press fit, and connected to the hollow shaft, thereby preventing water from penetrating into the circumferential angle area not covered by the seal in the circumferential direction. Therefore, there is no significant annular gap between the shaft and the hollow shaft. The seal closes the free space provided by the inner groove of the hollow shaft and leading to the external environment. Therefore, the keyway is protected from the penetration of spray water.

[0012] In an advantageous embodiment, the seal has a base region and a retaining region.

[0013] wherein the holding area is received in the keyway and / or adjoins the key,

[0014] In particular, the seal is constructed integrally and / or in one piece with its base region and holding region. Advantageously, the holding region inserted into the keyway holds the seal and the base region provides a sealing function with its lamella.

[0015] In an advantageous embodiment, the base region protrudes in the axial direction beyond the region covered by the retaining region in the axial direction. This has the advantage that the jet water is kept sufficiently far away from the keyway in the axial direction.

[0016] In an advantageous design, a thin plate is formed on the base component, in particular, a thin plate is formed on a section of the base component that protrudes from a region covered by the holding region in the axial direction.

[0017] The lamella seals from the base part toward the hollow shaft, in particular toward the inner groove of the hollow shaft and toward the shaft. The advantage here is that the sealing function and the retaining function are spatially separated and arranged on the seal.

[0018] In an advantageous design, the lamellae are spaced apart from each other, in particular regularly spaced apart from each other in the axial direction. Advantageously, when one of the lamellae fails, other lamellae are still present, and therefore a high safety against leaks can be achieved.

[0019] In an advantageous embodiment, each of the lamellae surrounds the outer circumference of the base region completely without interruption. This has the advantage that the sealing function is ensured.

[0020] In an advantageous embodiment, the base region is designed to be concavely curved on its side facing the shaft.

[0021] The bending radius, in particular in the area covered by the base component in the axial direction, is equal to the radius of the radial outer periphery of the shaft. The advantage here is that the base area and the thin sheet formed thereon conform to the outer shape of the shaft and thus an improved sealing can be achieved.

[0022] The lamella may also be referred to as sealing lip.

[0023] In an advantageous design, the holding area is shaped as a semi-cylindrical shape. Advantageously, the keyway is filled together with the seal by the key.

[0024] In an advantageous embodiment, the base region is shaped substantially in a cuboid shape. This has the advantage that the inner groove of the hollow shaft can be designed with a rectangular cross section and thus sufficiently good filling of the inner groove can be achieved with the base region and thus sealing can be ensured.

[0025] In an advantageous embodiment, the wall thickness, in particular the wall thickness measured in the axial direction, decreases monotonically, in particular strictly monotonically, with increasing distance from the base region. This has the advantage that the outermost tip of the corresponding lamella can be deformed very well, since the wall thickness is smallest at the tip. This makes it possible to achieve an improved contact of the corresponding lamella on the inner groove of the hollow shaft and thus ensure a high degree of sealing.

[0026] In an advantageous design, the threaded element is screwed into the central threaded hole of the shaft, wherein the threaded element head of the threaded element abuts against a retaining ring or against a shaft step of the hollow shaft, and the retaining ring is arranged in an annular groove of the hollow shaft in an axially positively locked manner. This has the advantage that axial limiting can be realized simply and cost-effectively.

[0027] In an advantageous design, the inner groove of the hollow shaft is designed to be axially continuous or at least extend from the end side to the area covered by the keyway in the axial direction, in particular including this area. The advantage here is that simple manufacturing can be achieved and the seal is not fixed in the axial direction.

[0028] In an advantageous design, each lamella has the shape of a rectangular frame or ring, in particular a trapezoidal cross section. The advantage here is that the lamella conforms to the shape of the inner groove and can thus reliably ensure sealing. The lamellae protrude radially at each angular position of the circumference.

[0029] In an advantageous design, the base region, the holding region and the lamella are constructed integrally and / or in one piece with one another. Advantageously, the seal can be manufactured simply and cost-effectively as an injection-molded part made of plastic, and therefore complex geometries do not increase manufacturing costs.

[0030] An important feature of the method for producing a shaft-hub connection is that the seal is separated from the plastic injection-molded part and then inserted into the keyway.

[0031] In particular, the plastic injection-molded part comprises a further sealing part, in particular a sealing part having a structural size which differs from the structural size of the sealing part.

[0032] The advantage here is that different structural sizes of the shaft-hub connection can be produced cost-effectively with seals of correspondingly different sizes, especially even in the case of small batches or even individual orders. Since the seals of different sizes can be produced together as a plastic injection-molded part, the seals required in each case can be separated from it as required. Preferably, these seals are arranged on the connecting piece.

[0033] Further advantages are given by the dependent claims. The invention is not limited to the feature combinations of the claims. For a person skilled in the art, other reasonable combinations of the claims and / or the features of the individual claims and / or the features of the description and / or the features of the drawings are apparent, in particular from the objectives proposed and / or from a comparison with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Now the present invention is described in detail according to the schematic diagram:

[0035] exist Figure 1 The shaft-hub connection device according to the present invention is shown in an oblique view.

[0036] exist Figure 2 The shaft-hub connection is shown in section.

[0037] exist Figure 3 The shaft-hub connection is shown exploded in an oblique view.

[0038] exist Figure 4 The seal 20 of the shaft-hub connection is shown in an oblique view.

[0039] exist Figure 5 The injection-molded part 50 is shown in an oblique view. DETAILED DESCRIPTION

[0040] As shown in the drawings, the shaft-hub connection comprises a shaft 1 having a keyway. A key 21 is inserted into the keyway of the shaft 1 and radially projects into an inner groove, in particular an axial groove, in particular a further keyway, of the hollow shaft 2 of the shaft-hub connection.

[0041] The keyway has two semi-cylindrical rounded arc-shaped areas, between which a cuboid-shaped area is formed.

[0042] The key 21 does not completely fill the keyway of the shaft 1 , but has only a semi-cylindrical rounded arc region and a cuboid region.

[0043] Therefore, one of the two semi-cylindrical rounded areas also remains free after the key 21 has been inserted.

[0044] In order to close this remaining spatial region, a seal 20 is inserted into this spatial region.

[0045] As in Figure 1 As shown in FIG. 1 , during cleaning, the seal 20 prevents the water jet 3 from penetrating into the keyway.

[0046] The shaft 1 and the hollow shaft 2 are each made of metal, in particular steel.

[0047] The seal 20 is preferably made of plastic, in particular of an elastomer.

[0048] The seal 20 projects radially from the groove of the shaft 1 into the inner groove of the hollow shaft 2 and thus seals against the hollow shaft 2 .

[0049] The seal has a semi-cylindrical arc region, which fills the remaining space region after the key 21 is inserted into the keyway of the shaft 1. In addition, the seal 20 has a substantially cuboid region, which adjoins the semi-cylindrical arc region and is located radially outside the keyway of the shaft 1 and therefore extends into the inner groove of the hollow shaft 2.

[0050] The cuboid region of the seal 20 extends beyond the arc region of the semi-cylinder in the axial direction and into the inner groove of the hollow shaft 2. On the side of the seal facing the shaft 1, the cuboid region is concavely curved, wherein the value of the curvature radius in the region covered by the cuboid region of the seal 20 in the axial direction is equal to the value of the radius of curvature of the radial outer circumference of the shaft 1.

[0051] Preferably, the inner groove completely penetrates the hollow shaft 1 in the axial direction, or at least extends from the end side of the hollow shaft 2 to and beyond the region covered by the keyway in the axial direction.

[0052] Thin sheets 41 are formed on the cuboid region of the seal 20, and the thin sheets respectively completely surround the cuboid region of the seal 20 in the radial direction. In particular, the thin sheets 41 protrude in the radial direction on the cuboid region of the seal 20 at all circumferential angular positions.

[0053] Each sheet has the shape of a rectangular frame or ring.

[0054] The lamellae 41 are spaced apart from one another in the axial direction, in particular spaced apart uniformly.

[0055] Preferably, two to six lamellae 41 are formed, in particular four lamellae 41 are formed. The wall thickness of each of the lamellae 41, in particular the wall thickness measured in the axial direction, decreases monotonically, in particular strictly monotonically, with increasing distance from the cuboid region of the seal 20. With the aid of the lamellae 41, in particular the sealing lamellae, the seal 20 is sealed not only relative to the hollow shaft 2 but also relative to the shaft 1.

[0056] Therefore, water of the water jet 3 is prevented from penetrating into the keyway.

[0057] The axial direction is parallel to the rotation axis of the shaft 1. The rotation axis of the hollow shaft 2 is coaxial with the rotation axis of the shaft 1.

[0058] As in Figure 5 As shown in FIG. , the seal 20 is produced from a plastic injection molded part 50 , on which not only the seal 20 but also corresponding seals of different structural sizes are integrally molded.

[0059] Therefore, the seal 20 and the other seal are included by the plastic injection molded part, in particular, the seal and the other seal are integrally, i.e., one-piece constructed with the plastic injection molded part. The seal is arranged at the theoretical breaking point designed as a weak part, which is convenient for easy separation from the plastic injection molded part 50.

[0060] An elastomer, in particular rubber, is preferably suitable as the material for the seal 20 .

[0061] In other embodiments according to the invention, the key is designed without a semi-cylindrical arc region, in particular, the key is designed as a cuboid body.

[0062] List of reference numerals:

[0063] 1 axis

[0064] 2 Hollow shaft

[0065] 3 Water jets

[0066] 20 Seals

[0067] 21 keys

[0068] 22 threaded parts

[0069] 40 semi-cylindrical sections

[0070] 41 slices

[0071] 42 steps

[0072] 50 injection molded parts

Claims

1. A shaft-hub connection device, comprising a hollow shaft, a key and a shaft with a keyway, The hollow shaft has an internal groove. The key is inserted into the keyway and protrudes radially into the inner groove of the hollow shaft. It is characterized in that The keyway is only partially filled with the key. The seal is received in the keyway, In particular, the seal fills, in particular at least partially fills, the spatial region in the keyway which is not filled by the key.

2. The shaft-hub connection device according to claim 1, It is characterized in that The seal has a base region and a retaining region, The holding area is received in the keyway and / or adjacent to the key, In particular, the seal is designed integrally and / or in one piece with its base region and the retaining region.

3. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The base region protrudes in the axial direction beyond the region covered by the retaining region in the axial direction.

4. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The thin sheet is formed on the base component, in particular, the thin sheet is formed on a section of the base component that protrudes from the area covered by the holding area in the axial direction. The lamellae seal from the base component toward the hollow shaft, in particular toward the inner groove of the hollow shaft, and toward the shaft.

5. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The lamellae are spaced apart from one another in the axial direction, in particular regularly spaced apart from one another.

6. A shaft-hub connection according to any one of the preceding claims, It is characterized in that Each of the lamellae runs completely around the circumference of the base region without interruption.

7. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The base area is designed to be concavely curved on its side facing the axis. Therein, the bending radius—particularly in the region covered by the base component in the axial direction—is equal to the radius of the radial outer circumference of the shaft.

8. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The holding area is shaped as a semi-cylindrical shape.

9. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The base region is designed in the shape of a cuboid, in particular in the shape of a substantially cuboid.

10. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The wall thickness, in particular the wall thickness measured in the axial direction, decreases monotonically, in particular strictly monotonically, with increasing distance from the base region.

11. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The screw is screwed into the central threaded hole of the shaft, wherein the screw head of the screw rests on a retaining ring or on a shaft step of the hollow shaft, and the retaining ring is arranged in an annular groove of the hollow shaft in an axially positive manner.

12. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The inner groove of the hollow shaft is designed to be axially continuous or at least extends from the end side to a region covered by the keyway in the axial direction and in particular includes this region.

13. A shaft-hub connection according to any one of the preceding claims, It is characterized in that Each lamella has the shape of a rectangular frame or a ring, in particular with a trapezoidal cross section.

14. A shaft-hub connection according to any one of the preceding claims, It is characterized in that The base region, the holding region and the lamella are designed integrally and / or in one piece with one another.

15. A method for producing a shaft-hub connection according to any one of the preceding claims, It is characterized in that The seal is separated from the plastic injection molded part and then inserted into the keyway, In particular, the plastic injection-molded part comprises a further seal, the structural dimensions of which in particular differ from the structural dimensions of the seal.

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