Reduction gear with housing part

Abstract

The invention relates to a reduction gear having a housing part, wherein the housing part has a cylindrical inner wall which radially surrounds a wheel-shaped part, in particular a toothed part, such as a gear wheel, which is connected to an output shaft of the reduction gear in a rotationally fixed manner, wherein on the cylindrical inner wall there are formed web parts which are spaced apart from one another in the circumferential direction, in particular regularly spaced apart, which project radially inwards and extend axially, in particular wherein the web parts are longer in the axial direction than in the circumferential and radial directions.

Description

Technical Field

[0001] The present invention relates to a speed reducer having a housing component. Background Technology

[0002] As is well known, a reducer has a housing component that surrounds one or more oil-lubricated transmission stages of the reducer in a manner that forms a housing and is oil-sealed.

[0003] As the closest prior art, a planetary gear transmission mechanism is known from US 4,838,123 A.

[0004] A reducer drive device is known from DE 10 2017 203 318 A1. Summary of the Invention

[0005] Therefore, the purpose of this invention is to construct a speed reducer in a compact, resource-saving, and environmentally friendly manner.

[0006] According to the invention, this objective is achieved by a speed reducer according to the features given in claim 1.

[0007] In a reducer with a housing component, an important feature of the present invention is that the housing component has a cylindrical inner wall that radially surrounds a wheel-shaped component, particularly a toothed component, such as a gear, connected to the output shaft of the reducer in a manner that prevents relative rotation.

[0008] Among them, there are regularly spaced joint plates that are spaced apart from each other in the circumferential direction on the inner wall of the column. These joint plates protrude radially inward and extend axially. In particular, the joint plates are longer in the axial direction than in the circumferential and radial directions.

[0009] The advantage here is that the cylindrical inner wall requires only a small wall thickness, and despite this, high stability is achieved with the aid of a connecting plate. According to the invention, the cylindrical inner wall is designed as a hollow cylinder and arranged inside the outer wall region, particularly inside the square outer wall region. Therefore, fastening of the cover or flange portion by means of screws and / or tie rods can be achieved, particularly radially, between the cylindrical inner wall, i.e., the hollow cylinder and the square outer wall region. Thus, radial fastening can be achieved within the outer wall region, i.e., fastening in a protected area that does not require oil filling and / or is not oil-filled. In summary, the high-stability reducer housing requires very little material and structural space, and therefore the reducer can be manufactured in a resource-saving and environmentally friendly manner.

[0010] The outer wall area is separated from the inner wall, thus improving safety. This is because oil will not leak out if the outer wall area is damaged. In essence, the oil is protected by a double-walled arrangement.

[0011] In a favorable design, the sealing surface is connected to the inner wall of the column.

[0012] The sealing surface is constructed as a tapered face segment.

[0013] In particular, the axis of rotational symmetry of the tapered face section is coaxial with the axis of rotation of the output shaft. This has the advantage of allowing the cover to be sealed tightly. The tapered shape facilitates the insertion and centering of the cover relative to the housing cover.

[0014] In an advantageous design, the area covered by the connecting plate in the axial direction is connected to or spaced apart from the area covered by the sealing surface in the axial direction, but in particular, does not overlap with the area covered by the sealing surface in the axial direction. The advantage here is that the sealing ring rests against the sealing surface and is axially constrained by the connecting plate.

[0015] In a favorable design, the cover has an annular protrusion.

[0016] The cover and housing are connected such that the annular protrusion rests against the sealing surface. This provides an advantage in achieving a high level of sealing.

[0017] In a favorable design, the annular protrusion has a tapered surface area.

[0018] In particular, the annular protrusion has an outer conical surface area, which abuts against the inner conical sealing surface adjacent to the cylindrical inner wall.

[0019] The rotational symmetry axis of the outer conical surface region is coaxial with the rotational symmetry axis of the inner conical sealing surface. This has the advantage of facilitating threading and centering, and enabling a tight seal.

[0020] In a favorable design, the cylindrical inner wall is radially surrounded by the square outer wall of the shell component.

[0021] A wall region is arranged between the cylindrical inner wall and the square outer wall, connecting both the cylindrical inner wall and the square outer wall. This design offers the advantage of achieving high stability with minimal material consumption. Furthermore, the outer wall protects the connection area, where connectors for linking the cover and flange portions are located. Therefore, only a small volume of oil is needed for filling, and minimal material consumption is required.

[0022] In a favorable design, the radial distance between the cylindrical inner wall and the square outer wall can vary between zero and its maximum value in the circumferential direction, and in particular, can vary periodically. The advantage here is that the cylindrical inner wall is rigidly connected to the outer wall and is stably held in place by the outer wall.

[0023] In an advantageous design, a first domed region is formed on the first wall region, in which either an axially penetrating hole through the housing member or an axially threaded hole, particularly a blind hole, is machined. The advantage here is that simple and stable fastening can be achieved. Furthermore, the domed region is designed as a thickening portion of the wall region, thus achieving improved stability, because the wall region connects the radially inwardly extending cylindrical inner wall to the square outer wall region.

[0024] In an advantageous design, the axial region covered by the square outer wall includes the axial region covered by the cylindrical inner wall. The advantage here is that the outer wall region completely surrounds the inner wall in the circumferential direction; in other words, it surrounds the inner wall radially. Since the outer wall region protrudes beyond the inner wall both axially and in the opposite direction, the inner wall is thus protected. After connecting the cover and flange portions, the oil-filled internal space is configured in a manner that enhances safety.

[0025] In an advantageous design, a flange region is formed on the housing component. Specifically, this flange region enables the connection of a drive motor. The internal space region surrounded by the flange region extends through a notch into an internal space region surrounded by a cylindrical inner wall. The advantage here is that although the inner wall has a notch, this notch is used to guide the input shaft and toothed components, particularly pinions, that are connected to it in a non-rotatable manner. Therefore, the internal space region surrounded by the flange region can also be at least partially filled with oil, but is sealed off from the environment and the motor.

[0026] In an advantageous design, the input shaft of the reducer, driven by the motor, together with the toothed components, particularly the pinion, connected to the shaft in a non-rotatable manner, protrude toward the driven gear.

[0027] In particular, the teeth of the toothed component mesh with the teeth of the wheel-shaped component.

[0028] In particular, the wheel-shaped component is connected to the output shaft of the reducer in a manner that prevents relative rotation. The advantage of this is that the drive motor can be directly connected to the reducer, thus forming a unit with the reducer—that is, a geared motor.

[0029] In an advantageous design, the sealing ring is fitted onto the annular protrusion of the cover and is axially constrained by a connecting plate, particularly by the end side of the connecting plate.

[0030] In this design, the sealing ring is axially constrained by a cover on its axially opposite side to the connecting plate, specifically such that the sealing ring is axially constrained only at circumferentially spaced corners. The advantage of this is that the connecting plate not only improves rigidity but also axially constrains the sealing ring.

[0031] In an advantageous design, the maximum wall thickness of one or more of the connecting plates, measured in the circumferential direction, has a local maximum value as a function of the axial position and / or as a function of the distance from the sealing surface and / or the sealing ring, measured in the axial direction.

[0032] In particular, the axial location of the maximum wall thickness is situated in the following axial region, which is covered by a toothed component, especially a pinion, that meshes with the wheel-shaped component and is connected to the input shaft of the reducer in a manner that prevents relative rotation.

[0033] In particular, the axis of rotation of the wheel-shaped component is perpendicular to and / or spaced apart from the axis of rotation of the toothed component. An advantage here is that the maximum wall thickness in the axially intermediate region allows for high rigidity with lower material consumption.

[0034] In particular, vibrations of the housing component are suppressed when the maximum wall thickness is located in the axial region covered by toothed components, especially pinions, that mesh with the wheel-shaped component and are connected to the input shaft in a non-rotatable manner. Vibrations in this region can cause changes in the gap between the pinion and the wheel-shaped component. Therefore, the maximum wall thickness stabilizes the relevant area of ​​the housing component.

[0035] In a favorable design, the number of connecting plates is more than seven. The advantage here is that it allows for minimal slack in the sealing ring in the axial direction.

[0036] In an advantageous design, the shell components, including the cylindrical inner wall, the square outer wall area, the dome-shaped area, the wall area, and the flange area, are formed as a single, particularly one-piece, unit. Advantageously, this allows for simple manufacturing.

[0037] In a favorable design, the space enclosed by the inner wall of the column is at least partially filled with oil.

[0038] The space between the cylindrical inner wall and the square outer wall is sealed relative to the space at least partially filled with oil and surrounded by the cylindrical inner wall. The advantage here is that the internal space surrounded by the cylindrical inner wall can be filled with oil, thus lubricating the meshing teeth of the toothed components. The connection area between the housing and the cover is arranged radially outside the cylindrical inner wall and therefore outside the oil area.

[0039] Further advantages are provided by the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, particularly for purposes proposed and / or by comparison with the prior art, other reasonable combinations of features of the claims and / or individual claims and / or description features and / or drawings are possible. Attached Figure Description

[0040] The present invention will now be described in detail with reference to the schematic diagram:

[0041] exist Figure 1 The image shows a perspective view of the housing component 2 of the reducer;

[0042] exist Figure 2 The top view of housing component 2 is shown in the figure;

[0043] exist Figure 3 The image shows an exploded perspective view of the reducer housing, which includes housing part 2, sealing ring 30, and cover part 32.

[0044] exist Figure 4 The diagram shows a cross-section through the shell, with the cross-sectional orientation also shown in the side view of the shell in addition to the cross-section. Detailed Implementation

[0045] As shown in the attached figures, the housing 2 has a square outer periphery and a cylindrical inner wall 7 that follows the outer periphery of the output gear and surrounds the output gear.

[0046] However, according to the present invention, axially extending connecting plates 1 are formed on the cylindrical inner wall 7, and these connecting plates protrude radially inward. These connecting plates 1 are preferably regularly spaced apart from each other in the circumferential direction.

[0047] Therefore, when the output gear rotates, it can cause vortices in the oil filling the internal space of the reducer, thereby reducing the heat transfer resistance from the oil to the housing.

[0048] Furthermore, the inner wall 7 of the column can be designed to have a reduced wall thickness because the connecting plate 1 helps to reinforce it.

[0049] The cylindrical inner wall 7 is radially spaced from the square outer periphery of the reducer, that is, spaced from the square outer wall area of ​​the reducer.

[0050] In order to firmly connect the cylindrical inner wall 7 with the square outer wall area, forming a plate-like wall area, the wall area connects the cylindrical inner wall 7 with the square outer wall area.

[0051] One of the wall regions 4 has a domed region 3, which is designed as a thickened portion and has an axially extending threaded hole machined in the domed region.

[0052] A screw that passes through the cover 31 is screwed into the threaded hole, and the screw head presses the cover 31 against the housing 2.

[0053] The vaulted area 3 is connected to the inner columnar wall 7 via the wall area 4 and also to the square outer wall area.

[0054] In order to connect the drive motor, the housing 2 has a flange region 8, and the internal space region of the housing 2 surrounded by the flange region 8 passes through the notch 6 into the internal space region surrounded by the cylindrical inner wall 7.

[0055] Therefore, the input shaft driven by the motor, together with the toothed component connected to it in a non-rotatable manner, protrudes towards the driven wheel-shaped component. The teeth of the toothed component mesh with the teeth of the wheel-shaped component. This wheel-shaped component is connected to the output shaft of the reducer in a non-rotatable manner.

[0056] The axial direction, circumferential direction, and radial distance are always referenced here—unless otherwise explicitly specified—to the axis of rotation of the output shaft that is parallel to and coaxial with the axis of symmetry of the inner cylindrical wall 7.

[0057] The connecting plate 1 extends in the axial direction, so the longest extension dimension of the connecting plate is achieved in the axial direction.

[0058] The rotation axis of the input shaft is perpendicular to the rotation axis of the output shaft, and there is a non-zero distance between them.

[0059] A sealing surface 5 is also constructed on the cylindrical inner wall 7, and this sealing surface is conical. Here, the axis of symmetry of the cone is coaxial with the axis of rotation of the driven wheel-shaped component.

[0060] An annular protrusion is formed on the cover 31, which is also cone-shaped, and when the cover 31 is placed on the housing 2 and connected to the housing, the protrusion abuts against the cone.

[0061] The sealing ring 30 is fitted onto the annular protrusion 32, and after the cover 31 is placed on the housing 2 and connected to the housing, the sealing ring abuts against the sealing surface 5, especially against the cylindrical inner wall 7, so that the sealing ring 30 is pressed against the housing 2 by the cover 31.

[0062] The sealing ring 30 is axially restricted in the circumferential corner region covered by the radially inwardly protruding connecting plates. Therefore, further axial intrusion of the sealing ring is prevented. However, a slight loosening in the axial direction occurs in the circumferential corner region between the connecting plates along the circumferential direction. Nevertheless, the sealing ring 30 achieves a tight seal by elastically deforming between the annular protrusion 32 and the sealing surface 5, thus ensuring a tight fit.

[0063] Therefore, the cover 31 is connected to the cylindrical inner wall 7 in an oil-tight manner. Thus, the space area surrounded by the cylindrical inner wall 7 can be filled with oil. Therefore, the space area existing between the cylindrical inner wall 7 and the square outer wall area is sealed relative to the oil-filled space area surrounded by the cylindrical inner wall 7.

[0064] The distance between the maximum radial distance R of the wheel-shaped component and the minimum net radial distance of the connecting plate 1 is preferably less than 10% of the maximum radial distance R of the wheel-shaped component.

[0065] Some of the domed areas 9 are not designed with axially oriented threaded holes, but rather with axially through holes for threading pull rods, which connect the flange caps located on the side of the housing 2 opposite to the cover 30 to the housing 2. Here, nuts are screwed onto the pull rods axially on both sides.

[0066] A centering protrusion is constructed on the housing part 2 on the radially outer side of the centering surface. The centering protrusion is operatively connected to the centering surface constructed on the cover, so that the cover can be centered relative to the housing part 2.

[0067] In another embodiment of the invention, a different seal is used instead of the sealing ring 30.

[0068] List of reference numerals in the attached diagram:

[0069] 1 Connector

[0070] 2 housing components

[0071] 3. Arched area

[0072] 4-wall area

[0073] 5 sealing surfaces

[0074] 6 Notches for the input shaft

[0075] 7-column inner wall

[0076] 8 flange areas

[0077] 9 arched areas

[0078] 30 sealing rings, especially O-rings

[0079] 31 Cover piece

[0080] 32. Annular protrusion

Claims

1. A speed reducer having a housing component, in, The housing component has a cylindrical inner wall that radially surrounds the gear connected to the output shaft of the reducer in a manner that prevents relative rotation. The cylindrical inner wall has connecting plates spaced apart from each other in the circumferential direction, which protrude radially inward and extend axially. The connecting plate is longer in the axial direction than in the circumferential and radial directions. The maximum wall thickness of one or more of the connecting plates, measured in the circumferential direction, has a local maximum value as a function of axial position and / or as a function of the distance from the sealing surface and / or sealing ring, measured in the axial direction. The axial location of the maximum wall thickness is situated in the following axial region, which is covered by a toothed component that meshes with the wheel-shaped component and is connected to the input shaft of the reducer in a manner that prevents relative rotation. The rotation axis of the wheel-shaped component is perpendicular to and / or spaced apart from the rotation axis of the toothed component.

2. The reducer according to claim 1, Its features are, The sealing surface is connected to the inner wall of the column. The sealing surface is constructed as a tapered face segment. The axis of rotational symmetry of the tapered facial segment is coaxial with the axis of rotation of the output shaft.

3. The reducer according to claim 1 or 2, Its features are, The area covered by the connecting plate in the axial direction is connected to or spaced apart from the area covered by the sealing surface in the axial direction, and the area covered by the connecting plate in the axial direction does not overlap with the area covered by the sealing surface in the axial direction.

4. The reducer according to claim 1 or 2, Its features are, The cover has an annular protrusion. The cover is connected to the housing, so that the annular protrusion rests against the sealing surface.

5. The reducer according to claim 4, Its features are, The annular protrusion has a conical surface area. The annular protrusion has an outer conical surface area, which rests against the inner conical sealing surface. The rotational symmetry axis of the outer conical surface region is coaxial with the rotational symmetry axis of the inner conical sealing surface.

6. The reducer according to claim 1 or 2, Its features are, The cylindrical inner wall is radially surrounded by the square outer wall of the housing component. A wall region is arranged between the inner cylindrical wall and the outer square wall, wherein the wall region is connected to the inner cylindrical wall and the outer square wall.

7. The reducer according to claim 6, Its features are, The radial distance between the inner wall of the column and the outer wall of the square can vary between zero and its maximum value in the circumferential direction.

8. The reducer according to claim 1 or 2, Its features are, A first dome-shaped region is formed on the first wall region, in which either an axial through-hole or an axial threaded hole is machined.

9. The reducer according to claim 6, Its features are, The axial region covered by the square outer wall includes the axial region covered by the cylindrical inner wall.

10. The reducer according to claim 6, Its features are, A flange region is formed on the housing component, which can be used to connect a drive motor. The internal space region surrounded by the flange region passes through the notch (6) into the internal space region surrounded by the cylindrical inner wall.

11. The reducer according to claim 1 or 2, Its features are, The input shaft of the reducer, driven by the motor, together with the toothed component connected to the input shaft in a manner that prevents relative rotation, protrudes toward the driven wheel-shaped component. In this component, the teeth of the toothed part mesh with the teeth of the wheel-shaped part. The wheel-shaped component is connected to the output shaft of the reducer in a manner that prevents relative rotation.

12. The reducer according to claim 4, Its features are, The sealing ring (30) is fitted onto the annular protrusion (32) of the cover (31) and is axially constrained by the connecting plate. The sealing ring is axially restricted by the cover on its axially opposite side of the connecting plate, such that the sealing ring is only axially restricted at circumferentially spaced corners.

13. The reducer according to claim 1 or 2, Its features are, The connecting plates are spaced apart regularly.

14. The reducer according to claim 10, Its features are, The number of connectors is greater than 7. And / or, The shell components, including the cylindrical inner wall, the square outer wall area, the dome-shaped area, the wall area, and the flange area, are integrated into one unit.

15. The reducer according to claim 6, Its features are, The space enclosed by the inner wall of the column is at least partially filled with oil. The space between the inner cylindrical wall and the outer square wall is sealed relative to the space that is at least partially filled with oil and surrounded by the inner cylindrical wall.

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