Speed reducer with ventilation device
By setting seals and ventilation devices in the reducer, the overpressure problem caused by oil expansion is solved, ensuring the reliable operation of the reducer and the effectiveness of the seal.
Patent Information
- Application Number
- CN202311726918.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-13
- Publication Date
- 2025-06-13
AI Technical Summary
The oil expansion of existing reducers during heating may lead to overpressure, which in turn endangers the effectiveness of the seal and affects the reliable operation of the reducer.
A seal is provided between the upper and lower parts of the reducer, and a ventilation device is installed in the through threaded hole of the upper part. The ventilation device is fixed to the threaded hole through the annular threaded member to prevent the occurrence of overpressure.
Through the design of the ventilation device, overpressure caused by oil expansion is avoided, and the seal is not exposed to high overpressure, thereby achieving reliable and interference-free operation of the reducer.
Smart Images
Figure CN120140447A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a speed reducer with a ventilation device. Background Art
[0002] It is generally known that the speed reducer is at least partially filled with oil. Summary of the Invention
[0003] Therefore, the object of the present invention is to improve the speed reducer, wherein reliable or interference-free operation should be ensured.
[0004] According to the present invention, this object is achieved by a speed reducer according to the given features.
[0005] In the speed reducer, an important feature of the present invention is that the housing of the speed reducer has a lower part and an upper part placed on the lower part,
[0006] In particular, a seal, especially a flat seal, is arranged between the lower part and the upper part.
[0007] Wherein, the ventilation device of the speed reducer is arranged in a through threaded hole of the upper part.
[0008] The advantage here is that when the speed reducer heats up, although the oil expands, overpressure is avoided because the ventilation device prevents the generation of overpressure. Thus, the seal is not exposed to a dangerous high overpressure that may cause the seal to fail. Therefore, interference-free and / or reliable operation can be ensured in this way.
[0009] In an advantageous design, the speed reducer is at least partially filled with oil, especially wherein the oil level is arranged below the ventilation device and / or the oil level is arranged below the dividing plane of the speed reducer, that is, especially below the contact plane between the upper part and the lower part. The advantage here is that the oil level is arranged below the dividing plane, and thus only a small amount of oil can overflow even when the seal fails.
[0010] In an advantageous design, the ventilation device has an annular threaded part that is screwed into the threaded hole. The advantage here is that simple and reliable fixation of the ventilation device is achieved.
[0011] In an advantageous design, the threaded part has an axially protruding flange. The advantage here is that other components can be simply fixed at the threaded part.
[0012] In an advantageous design, a protrusion formed at the dividing disk in an axially protruding manner elastically pre-tightly abuts against the inner side of the flange.
[0013] In particular, the protrusions are spaced apart from one another in the circumferential direction, in particular in the circumferential direction with respect to the thread axis of the threaded part. The advantage here is that a simple and reliable connection can be achieved.
[0014] In an advantageous design, a grille, in particular a spacer ring, a grille and a sealing ring, is arranged radially inside the flange.
[0015] The protrusions press the grille against the step of the threaded part. In particular, the protrusions press the sealing ring onto the grille, whereby the grille is pressed onto the spacer ring, and thus the spacer ring is pressed against the step of the threaded part. The advantage here is that the grille is arranged to be protected by the flange against environmental influences.
[0016] In an advantageous design, the grille is arranged radially inside the flange. The advantage here is that the grille is arranged in a protected manner within the flange.
[0017] In an advantageous design, the separating disc has axially extending notches which are spaced apart from one another in the circumferential direction and are spaced radially from the axially extending central hole of the separating disc.
[0018] In particular, additional notches are arranged radially outside the central hole. The advantage here is that air can flow axially through the separating disc and towards the environment via the filter element, where the oil entering the sleeve overflows through the opening of the sleeve and then the oil reaches the separating disc.
[0019] In an advantageous design, a hollow cylindrical filter element is inserted onto the separating disc.
[0020] In particular, the cylindrical axis of the hollow cylindrical filter element is coaxial with the thread axis. The advantage here is that a simple connection can be achieved.
[0021] In an advantageous design, the filter element is surrounded circumferentially by a protective cap which is slipped onto the flange and is held elastically in particular. The advantage here is that reliable operation can be achieved.
[0022] In an advantageous design, a bushing having a radially outwardly projecting flange region is inserted into the threaded part and projects axially at the end region of the threaded part facing away from the protective cap.
[0023] The flange region abuts against the step of the threaded part. The advantage here is that the bushing conducts the incoming oil.
[0024] In an advantageous design, the bushing has at least one first opening that axially penetrates through and leads into the internal space of the speed reducer. The advantage here is that during overpressure, air or an air-oil mixture can enter the bushing, and the oil stabilized there can then flow back into the internal space of the speed reducer through the second opening.
[0025] In an advantageous design, the bushing has at least one second opening that radially penetrates through and leads into an annular gap formed between the threaded part and the bushing, and the annular gap leads into the internal space of the speed reducer. The advantage here is that the oil stabilized within the bushing can be guided back into the internal space of the speed reducer. Here, the second opening does not directly lead into the internal space of the speed reducer, but into the annular gap between the threaded part and the bushing, where the annular axis of the annular gap is parallel to the thread axis of the threaded part and / or parallel to the vertical direction, and the annular gap leads into the internal space of the speed reducer at its axial end region facing away from the protective cap or the separating disk.
[0026] In an advantageous design, the throughput capacity of the grille is much smaller than that of the opening. The advantage here is that it blocks the oil from passing through the grille and then reaching the environment.
[0027] In an advantageous design, the net diameter of the corresponding grille openings of the grille is smaller than the net diameter of the opening, especially smaller than the smallest net diameter of the opening. The advantage here is that it makes it difficult for the oil to pass through the grille.
[0028] In an advantageous design, the filter element is inserted into an annular groove that is continuously formed in the separating disk in the circumferential direction. The advantage here is that simple fixation can be achieved.
[0029] 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 combination possibilities of the claims and / or single claim features and / or the features of the description and / or the features of the drawings can be obtained, especially from the purpose proposed and / or by comparison with the prior art. Description of the Drawings
[0030] Now, the present invention will be described in detail according to the schematic diagrams:
[0031] Figure 1 A speed reducer according to the present invention is shown, which has a split housing and a ventilation device 1, especially a pressure balancing element or a ventilation bolt, where the speed reducer is at least partially filled with oil.
[0032] Figure 2 A side view of the ventilation device 1, especially the pressure balancing element, is shown.
[0033] Figure 3The ventilation device 1 is shown in an exploded perspective view.
[0034] Figure 4 A sectional view of the ventilation device 1, in particular of the pressure equalizing element, is shown.
[0035] Figure 5 The ventilation device 1 is shown in an exploded side view.
[0036] List of reference numerals:
[0037] 1 Ventilation device, in particular pressure equalizing element or ventilation bolt
[0038] 2 Upper part
[0039] 3 Lower part
[0040] 31 Protective cap
[0041] 32 Filter element
[0042] 33 Separator disk
[0043] 34 Sealing ring
[0044] 35 Grille, in particular metal grille
[0045] 36 Spacer ring
[0046] 37 Threaded part
[0047] 38 Bushing
[0048] 39 Notch
[0049] 40 Projection Detailed description
[0050] As shown, the housing of the speed reducer has a lower part 3, and the upper part 2 of the speed reducer is placed on this lower part.
[0051] The bearing receptacles for the input shaft and the output shaft are arranged partly, in particular each half, in the lower part 3 and partly, in particular each half, in the upper part 2. Thus, when the upper part 2 is removed, the bearings can be inserted into the part of the respective bearing receptacle constructed in the lower part 3 and then placed into the upper part 2.
[0052] The speed reducer is at least partly filled with oil, in particular such that the oil level is arranged below the dividing plane, i.e., below the contact plane between the upper part 2 and the lower part 3.
[0053] However, during operation, the oil is splashed everywhere in the entire internal space, so that the oil reaches in particular the inner side of the upper part 2.
[0054] To establish pressure equilibrium with the ambient air around the speed reducer, a ventilation device 1 is provided, which is screwed into a hole passing through the upper part 2. Thus, especially during operation, when the temperature rises, air is discharged from the internal space of the speed reducer, and when the temperature drops, air flows into the internal space of the speed reducer from the environment, so that the air pressure difference between the internal space of the speed reducer and the ambient air around the speed reducer is very small.
[0055] For this purpose, the ventilation device 1 has an annular threaded part 37, which is screwed into the through threaded hole of the upper part 2 with its external thread.
[0056] The threaded part 37 has an external thread with which the threaded part can be screwed into the threaded hole of the upper part 2.
[0057] The threaded part 37 has an axially protruding flange that completely surrounds it in the circumferential direction, and a spacer ring 36 is inserted into this flange. A grille 35, especially a metal grille, is arranged on the spacer ring, and a sealing ring 34 is arranged on the grille.
[0058] The separating disk 37 has a protrusion 40 that protrudes towards the sealing ring 34, and this protrusion is pressed against the inner edge of the flange in an elastically preloaded manner.
[0059] Therefore, the separating disk 37 is located above the sealing ring 34, where the protrusion 40 presses the sealing ring 34 onto the grille 35, and the grille abuts against the stepped portion of the threaded part 37 through the spacer ring 36.
[0060] The separating disk 37 has notches 39 that penetrate axially, especially parallel to the hole axis of the threaded hole and / or the thread axis of the threaded part 37. These notches are radially spaced from the axially penetrating central hole of the threaded part 37 and are arranged radially outside the central hole.
[0061] A hollow cylindrical filter element 32 is inserted onto the separating disk 37. The filter element is surrounded by a protective cap 31, and the protective cap is sleeved onto the flange and thus connected to the separating disk 37.
[0062] A bushing 38 with a radially outward protruding flange region is inserted into the threaded part and axially protrudes at the end region of the threaded part 37 facing away from the protective cap 31, where the flange region abuts against the stepped portion of the threaded part 37.
[0063] The bushing 38 has an opening facing the internal space of the speed reducer, so that oil can penetrate into the bushing 38.
[0064] However, the passage capacity of the grille 35 is much smaller than that of the opening.
[0065] Thus, in this way, ventilation is achieved especially although the oil inside the internal space of the speed reducer is splashed onto the cover part at the inner side.
[0066] In particular, the bushing 38 has an axially through-going first opening in the end region facing away from the protective cap 31.
[0067] Above this first opening, i.e., in the vicinity of the separating disk 33, the bushing 38 has one or more radially through-going second openings, so that the infiltrating oil can flow radially out of the bushing 38 into the annular gap constructed between the bushing 38 and the threaded part 37 and leading into the interior space of the speed reducer.
[0068] The discharged air passes through the grille 35 and the filter element 32 in order to subsequently reach the environment between the filter element 32 and the inner side of the protective cap 31.
[0069] The grille openings of the grille 35 have a clear diameter that is smaller than the clear diameter of the opening, in particular the smallest clear diameter.
[0070] Preferably, the filter element 32 is made of cotton. The separating disk 33 can be made of metal, and the protective cap 1 and the threaded part 37 can be made of metal.
[0071] Thereby, the ventilation device 1 is arranged in the upper part 2 above the oil level and is thus only loaded with splashed oil.
[0072] In other embodiments according to the invention, the protective cap 1 is made of plastic. In particular, the separating disk 33 can be made of plastic.
Claims
1. A speed reducer with a ventilation device, The housing of the speed reducer has a lower part and an upper part placed on the lower part. In particular, a seal, especially a planar seal, is arranged between the lower part and the upper part. It is characterized in that The ventilation device of the speed reducer is arranged in a through threaded hole of the upper part.
2. The speed reducer according to claim 1, It is characterized in that The speed reducer is at least partially filled with oil. In particular, the oil level is arranged below the ventilation device and / or the oil level is arranged below the dividing plane of the speed reducer, that is, especially below the contact plane between the upper part and the lower part.
3. The speed reducer according to any one of the preceding claims, It is characterized in that The ventilation device has an annular threaded part, and the threaded part is screwed into the threaded hole.
4. The speed reducer according to any one of the preceding claims, It is characterized in that The threaded part has an axially protruding flange.
5. The speed reducer according to any one of the preceding claims, It is characterized in that The protrusions formed at the dividing plate in an axially protruding manner are elastically pre-tensioned against the inner side of the flange. In particular, the protrusions are spaced apart from each other in the circumferential direction - especially along the circumferential direction with reference to the threaded axis of the threaded part.
6. The speed reducer according to any one of the preceding claims, It is characterized in that A grille, especially a spacer ring, a grille and a sealing ring, is arranged on the radially inner side of the flange. The protrusions press the grille against the stepped part of the threaded part. In particular, the protrusions press the sealing ring onto the grille, whereby the grille is pressed onto the spacer ring, thereby pressing the spacer ring against the stepped part of the threaded part.
7. The speed reducer according to any one of the preceding claims, It is characterized in that The grille is arranged on the radially inner side of the flange.
8. The speed reducer according to any one of the preceding claims, It is characterized in that The dividing plate has axially through notches, which are spaced apart from each other in the circumferential direction and are radially spaced apart from the axially through central hole of the dividing plate. In particular, additional notches are arranged on the radially outer side of the central hole.
9. The speed reducer according to any one of the preceding claims, It is characterized in that A hollow cylindrical filter element is inserted onto the dividing plate. In particular, the cylindrical axis of the hollow cylindrical filter element is coaxial with the threaded axis.
10. The speed reducer according to any one of the preceding claims, It is characterized in that The filter element is surrounded by a protective cap in the circumferential direction. The protective cap is sleeved onto the flange and is especially elastically held.
11. The speed reducer according to any one of the preceding claims, It is characterized in that A bushing with a radially outwardly protruding flange region is inserted into the threaded part and axially protrudes at the end region of the threaded part facing away from the protective cap. The flange region abuts against the stepped part of the threaded part.
12. The speed reducer according to any one of the preceding claims, It is characterized in that The bushing has at least one axially through first opening, and the first opening leads to the internal space of the speed reducer.
13. The speed reducer according to any one of the preceding claims, It is characterized in that The bushing has at least one second opening that penetrates radially, and the second opening leads to an annular gap formed between the threaded member and the bushing, and the annular gap leads to the internal space of the speed reducer.
14. The speed reducer according to any one of the preceding claims, characterized in that the passing ability of the grille is much smaller than that of the opening, and / or the net diameter of the corresponding grille openings of the grille is smaller than the net diameter of the opening, in particular smaller than the smallest net diameter of the opening.
15. The speed reducer according to any one of the preceding claims, characterized in that the filter element is inserted into an annular groove that is continuously configured in the circumferential direction of the separating disk.