reducer

Abstract

The utility model relates to a kind of reducers, with the shaft supported in rotatable manner by bearing, especially rolling bearing, wherein, the inner ring of bearing is sleeved on the shaft, the outer ring of bearing is received in the support flange of reducer, wherein, annular sealing flange is received in support flange, wherein, at least one shaft seal ring is received in sealing flange, the sealing lip of shaft seal ring is sealed towards sealing surface, which is configured at the radial outer circumferential portion of annular member, wherein, annular member is sleeved on the shaft, wherein, radial hole is opened in the shaft at a circumferential position, wherein, pin is inserted into radial hole and radially extends from radial hole, so that pin extends into the groove of annular member.

Description

Technical Field

[0001] This utility model relates to a speed reducer having a shaft supported in a rotatable manner by bearings, especially rolling bearings. Background Technology

[0002] As is well known, the reducer is sealed by a shaft seal ring. Utility Model Content

[0003] Therefore, the purpose of this invention is to design a speed reducer that remains sealed even under thermal and mechanical loads.

[0004] According to this invention, the above objective is achieved by a speed reducer according to this invention.

[0005] An important feature of this invention regarding speed reducers is that the speed reducer has a shaft rotatably supported by bearings, particularly rolling bearings, wherein the inner ring of the bearing is fitted onto the shaft, the outer ring of the bearing is received in a support flange of the speed reducer, wherein an annular sealing flange is received in the support flange, wherein at least one shaft seal is received in the sealing flange, the sealing lip of the shaft seal sealing towards a sealing surface constructed at the radial outer periphery of the annular member, wherein the annular member is fitted onto the shaft, wherein a radial hole is formed at a circumference of the shaft, wherein a pin is inserted into the radial hole and extends radially from the radial hole, such that the pin extends into a groove of the annular member.

[0006] Advantageously, the annular element is arranged in a manner that prevents relative rotation and provides a sealing surface, so that even under thermal loads, the geometry of the annular element changes only slightly. Furthermore, the annular element is fixed axially.

[0007] In a preferred embodiment, the groove is designed in a U-shape, wherein the U-shape opens in the axial direction. Advantageously, the pin is restrained in the axial direction by the edge of the groove.

[0008] In a preferred embodiment, the area covered by the groove in the circumferential direction is the same as the area covered by the pin in the circumferential direction. Advantageously, the pin can be received in the groove without gaps in the circumferential direction.

[0009] In a preferred embodiment, the pin is received in the groove without any clearance in the circumferential direction. Advantageously, the annular member is connected to the shaft in a manner that prevents relative rotation.

[0010] In a preferred embodiment, the groove is configured not to penetrate the annular member in the radial direction. Advantageously, the groove is configured only as a radial recess and thus secures the pin in the radial direction.

[0011] In a preferred embodiment, the radial wall thickness of the annular member in the region covered by the groove in both the axial and circumferential directions is less than the radial wall thickness of the annular member in the region adjacent to that region, but the wall thickness is not zero. Advantageously, the groove is constructed only as a radial recess and thus secures the pin in the radial direction.

[0012] In a preferred embodiment, the annular member limits the pin in the radial direction. Advantageously, the pin fixes the annular member in the circumferential direction, and the annular member fixes the pin in the radial direction.

[0013] In a preferred embodiment, a pin connects the annular member to the shaft in a manner that prevents relative rotation and limits the annular member in the axial direction. Advantageously, the annular member is fixed, thus reliably providing a sealing surface for the sealing lip of the shaft seal.

[0014] In a preferred embodiment, the annular member is capped in a direction opposite to the axial direction by a shoulder of the shaft or by a flange, wherein the flange is fixed to the end side of the shaft by means of axially oriented bolts, wherein the bolts pass through the flange and are screwed into threaded holes in the shaft, and in particular, wherein the bolt heads press the flange against the end side of the shaft. Advantageously, the annular member is axially fixed by a pin and a shoulder or flange.

[0015] In a preferred embodiment, the annular member is heat-fitted onto the shaft. Advantageously, the annular member is fixedly connected to the shaft.

[0016] In a preferred embodiment, the annular member is force-locked to the shaft. Advantageously, the annular member and the shaft are connected in a manner that prevents relative rotation.

[0017] In a preferred embodiment, an adhesive is applied between the annular member and the shaft. Advantageously, even if the force-locking connection between the annular member and the shaft fails, the annular member remains securely connected to the shaft.

[0018] In a preferred embodiment, the second shaft seal ring is received in the sealing flange adjacent to the shaft seal ring in the axial direction, and the sealing lip of the second shaft seal ring also faces the sealing surface for sealing. In particular, the two shaft seal rings are arranged abutting against each other. This is advantageous because it results in better sealing performance.

[0019] In a preferred embodiment, the annular member has an axial end region in which the radial wall thickness of the annular member decreases monotonically, but particularly not strictly monotonically, as the axial distance from the shaft shoulder decreases. Advantageously, this allows for the creation of recesses to block oil for the shaft seal.

[0020] In a preferred embodiment, the annular member abuts against the shaft in the axial end region, thereby forming a radially circumferential recess. Advantageously, this allows for the blocking of oil for the shaft seal, or at least a reduction in the amount of oil flowing to the shaft seal.

[0021] In a preferred embodiment, the recess is arranged between the bearing and the shaft seal, particularly between the bearing and the shaft seal pair. Advantageously, the oil flow through the bearing does not flow entirely to the shaft seal.

[0022] In a preferred embodiment, the sealing surface is arranged at a radial distance equal to the maximum radial distance of the shoulder, particularly at the edge of the shoulder, especially the outer edge of the shoulder. Advantageously, the reducer can be designed compactly.

[0023] For those skilled in the art, especially from the purpose of this invention and / or from comparison with the prior art, other reasonable combinations of the features of the specification and / or the features of the drawings can be derived. Attached Figure Description

[0024] The present invention will be further illustrated below with reference to the schematic diagram:

[0025] Figure 1 A cross-sectional view of the first type of speed reducer according to the present invention is shown.

[0026] Figure 2 A magnified view of the area is shown;

[0027] Figure 3 An oblique view of the ring-shaped component 3 is shown. Detailed Implementation

[0028] As shown in the figure, the reducer has a shaft 1, a gear 6 is mounted on the shaft 1 and connected to the shaft 1 in a non-rotatable manner, the teeth of the gear 6 mesh with the teeth of the pinion shaft 7 which is rotatably supported, and the pinion shaft 7 is preferably driven by a motor.

[0029] Bearing 5, especially rolling bearing, has an inner ring and an outer ring. The inner ring is fitted onto the shaft 1, and the outer ring is received in the support flange 8 of the reducer.

[0030] An annular sealing flange 9 is received in a support flange 8, particularly in a support flange 8 that is also annular, and is sealed to the support flange.

[0031] At least one shaft seal ring 4, especially a pair of shaft seal rings, is received in the sealing flange 9, wherein the sealing lips of the shaft seal ring 4, especially the sealing lips of the pair of shaft seal rings, are distributed on the sealing surface, wherein the sealing surface is constructed at the radial outer periphery of the annular member 3, which is fitted onto the shaft 1 and is force-locked to the shaft 1, especially by a heat-fitting method.

[0032] The axial dimension of the annular component 3 is greater than the axial dimension of the shaft seal ring 4, especially the axial dimension of the shaft seal ring pair.

[0033] In particular, the area covered by the annular member 3 in the axial direction includes the area covered by the shaft seal ring 4, and especially the area covered by the shaft seal ring pair in the axial direction.

[0034] The flange 2, which is fixed to the end side of the shaft 1 by means of axially oriented bolts 20, protrudes radially from the end side of the shaft 1 and thus limits the annular part 3 in the axial direction.

[0035] In particular, the annular member 3 rests against the flange 2. Alternatively, the annular member 3 rests against the shoulder of the shaft 1, wherein the shoulder is located at the axial end region of the annular member 3 away from the flange 2.

[0036] At a circumferential position, shaft 1 has a radial hole into which a pin is inserted. The annular member 3 also has a U-shaped groove at this circumferential position into which the pin extends.

[0037] The U-shaped groove opens in the axial direction.

[0038] In this way, on the one hand, the annular part 3 is prevented from twisting relative to the shaft 1, that is, the annular part 3 and the shaft 1 are connected in a way that prevents relative rotation, and on the other hand, the pin limits the annular part 3 along the axial direction, and the shoulder or flange 2 limits the annular part 3 in the opposite direction to the axial direction.

[0039] Preferably, during the heat fitting of the annular member 2, an adhesive is applied between the annular member 2 and the shaft 1. In this way, even if the force-locking and material-locking connections fail, the pin still secures the annular member in the circumferential direction and axially limits the annular member together with the shaft shoulder or flange 2.

[0040] The sealing flange 9 is connected to the supporting flange 8 by means of bolts.

[0041] Preferably, the U-shaped groove is not radially through, with the pin extending radially from shaft 1 until it enters the U-shaped groove. In this way, the remaining wall thickness of the annular member shields the pin, thereby preventing the pin from moving out in the radial direction.

[0042] In particular, the annular member 3 has an axial end region in which the radial wall thickness of the annular member decreases monotonically, but particularly not strictly monotonically, with decreasing axial distance from the shaft shoulder. Nevertheless, the annular member 3 abuts against the shaft 1 even in this axial end region, thereby forming a radial recess resembling a surrounding annular groove, which is arranged between the bearing 5 and the shaft seal 4, particularly between the bearing 5 and the shaft seal pair. This recess weakens the oil flow through the bearing 5 and towards the shaft seal 4. Here, the shaft shoulder, through centrifugal force, prevents all the oil passing through the bearing 5 from flowing to the shaft seal 4 through this radially deeper recess.

[0043] More preferably, the recess leads directly or through an annular gap into a channel constructed in the support flange 8, which delivers oil back to the reducer interior, particularly to the reducer's oil pan. Thus, only a small amount of oil remaining after passing through the bearing 5 reaches the shaft seal 4 for lubrication there.

[0044] Advantageously, the sealing surface is arranged at the same radial distance as the shoulder, especially the edge of the shoulder.

[0045] Here, the radial distance is always measured relative to the axis of rotation of shaft 1, since the radial direction is relative to the axis of rotation of shaft 1. Similarly, the circumferential direction is relative to the axis of rotation of shaft 1, and the axial direction is parallel to the axis of rotation of shaft 1.

[0046] Preferably, the shaft 1 and the annular member 3 are made of the same material, especially the same steel.

[0047] List of reference numerals

[0048] 1 axis

[0049] 2 flanges

[0050] 3 ring parts

[0051] 4-axis seals, especially multiple shaft seals

[0052] 5 bearings

[0053] 6 gears

[0054] 7 pinion shafts

[0055] 8 Support Flanges

[0056] 9 Sealing Flange

[0057] 20 bolts

[0058] 30 U-shaped groove.

Claims

1. A speed reducer having a shaft rotatably supported by bearings, in, The inner ring of the bearing is fitted onto the shaft, while the outer ring is housed within the reducer's support flange. Its features are, The annular sealing flange is received within the supporting flange. In this embodiment, at least one shaft seal is received in a sealing flange, with the sealing lip of the shaft seal facing the sealing surface constructed on the radial outer periphery of the annular member. The annular component is fitted onto the shaft. A radial hole is constructed at one circumference of the shaft. The pin is inserted into the radial hole and extends radially out of the radial hole, such that the pin extends into the groove of the annular part.

2. The reducer according to claim 1, characterized in that, The groove is designed in a U-shape, with the U-shape opening in the axial direction.

3. The reducer according to claim 1 or 2, characterized in that, The area covered by the groove in the circumferential direction is the same as the area covered by the pin in the circumferential direction.

4. The reducer according to claim 1 or 2, characterized in that, The pin is received in the groove without gaps in the circumferential direction.

5. The reducer according to claim 1 or 2, characterized in that, The groove is configured not to penetrate the annular member in the radial direction, and / or the radial wall thickness of the annular member in the area covered by the groove in the axial and circumferential directions is less than, but not zero, the radial wall thickness of the annular member in another area adjacent to said area.

6. The reducer according to claim 1 or 2, characterized in that, The ring-shaped component limits the pin in the radial direction.

7. The reducer according to claim 1 or 2, characterized in that, The pin connects the ring to the shaft in a manner that prevents relative rotation and limits the ring in the axial direction.

8. The reducer according to claim 7, characterized in that, The annular component is positioned in the opposite direction to the axial direction by means of a shoulder of the shaft or by means of a flange, wherein the flange is fixed to the end side of the shaft by means of axially oriented bolts, wherein the bolts pass through the flange and are screwed into the threaded holes of the shaft, wherein the bolt heads press the flange against the end side of the shaft.

9. The reducer according to claim 1 or 2, characterized in that, The annular component is heat-fitted onto the shaft, and / or the annular component is force-locked to the shaft.

10. The reducer according to claim 1 or 2, characterized in that, An adhesive is applied between the ring and the shaft.

11. The reducer according to claim 1 or 2, characterized in that, The second shaft seal ring is axially adjacent to the first shaft seal ring and is received in the sealing flange. The sealing lip of the second shaft seal ring also faces the sealing surface for sealing. The two shaft seal rings are arranged abutting each other.

12. The reducer according to claim 1 or 2, characterized in that, The annular component has an axial end region in which the radial wall thickness of the annular component decreases monotonically, but not strictly monotonically, as the axial distance from the shaft shoulder decreases.

13. The reducer according to claim 12, characterized in that, The annular part rests against the shaft in the axial end region, thereby forming a radially circumferential recess.

14. The reducer according to claim 13, characterized in that, The recess is located between the bearing and the shaft seal.

15. The reducer according to claim 8, characterized in that, The sealing surface is located at a radial distance equal to the maximum radial distance from the shaft shoulder.

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