Transmission

Abstract

A transmission, the case of the transmission having a lower part and an upper part that is placed on top of the lower part, a venting element of the transmission being arranged in a threaded through-hole in the upper part.

Description

[0001] Gearbox

[0002] Description:

[0003] The invention relates to a transmission.

[0004] It is common knowledge that gearboxes are at least partially filled with oil.

[0005] From DE 10 2022 003 369 A1, a gearbox is known as the closest prior art.

[0006] A pressure equalizer between the machine housing and the environment is known from WO 90 / 01 ​​130 A1.

[0007] A venting device is known from DE 10 2008 013 137 A1.

[0008] The invention is therefore based on the object of developing a transmission which is to ensure safe and trouble-free operation.

[0009] According to the invention, the object is achieved in the transmission according to the features specified in claim 1.

[0010] Important features of the invention in the transmission are that the housing of the transmission has a lower part and an upper part which is placed on the lower part, in particular wherein a seal, in particular a flat seal, is arranged between the lower part and the upper part, wherein a venting device of the transmission is arranged in a through threaded bore of the upper part.

[0011] The advantage of this is that when the transmission heats up, the oil expands, but overpressure is avoided because the venting device prevents the buildup of excess pressure. Thus, the seal is not exposed to dangerously high overpressure, which could cause seal failure. This ensures trouble-free and / or safe operation.

[0012] In an advantageous embodiment, the transmission is at least partially filled with oil, in particular with the oil level located below the venting device and / or the oil level located below the splitting plane of the transmission, in particular below the contact plane between the upper and lower parts. Advantageously, the oil level is located below the splitting plane, thus ensuring that only small amounts of oil can escape even in the event of a seal failure.

[0013] In an advantageous embodiment, the venting device has an annular screw part that is screwed into the threaded bore. This provides the advantage of providing a simple, secure fastening of the venting device.

[0014] In an advantageous embodiment, the screw part has an axially protruding collar. This allows the other components to be easily attached to the screw part.

[0015] In an advantageous embodiment, the axially projecting projections on a cutting disc rest against the inside of the collar in an elastically prestressed manner, in particular with the projections being spaced apart from one another in the circumferential direction, particularly in the circumferential direction relative to the screw axis of the screw part. This is advantageous in that a simple and secure connection can be achieved.

[0016] In an advantageous embodiment, a grid, in particular a spacer ring, a grid and a sealing ring, is arranged radially inside the collar, wherein the projections press the grid against a step of the screw part, in particular wherein the projections press the sealing ring onto the grid, which is thus pressed onto the spacer ring, which is thereby pressed against a step of the screw part. It is advantageous in this case that the grid is arranged so as to be protected from environmental influences by the collar. In an advantageous embodiment, the grid is arranged radially inside the collar. It is advantageous in this case that the grid is arranged so as to be protected within the collar.

[0017] In an advantageous embodiment, the cutting disc has axially continuous recesses that are spaced apart from one another in the circumferential direction and radially spaced from an axially continuous central bore of the cutting disc, in particular with the additional recesses arranged radially outside the central bore. This advantageously allows air to pass axially through the cutting disc and flow to the environment via the filter element, with any oil that has entered the sleeve escaping through openings in the sleeve before reaching the cutting disc.

[0018] In an advantageous embodiment, a hollow cylindrical filter element is mounted on the separating disc, in particular with the cylinder axis of the hollow cylindrical filter element aligned coaxially with the screw axis. This allows for a simple connection.

[0019] In an advantageous embodiment, the filter element is radially surrounded by a protective cap, which is attached to the collar and is held in place elastically. This is advantageous because it enables safe operation.

[0020] In an advantageous embodiment, a bushing has a radially outwardly projecting collar portion, is inserted into the screw part, and protrudes axially from the end portion of the screw part facing away from the protective cap, with the collar portion resting against a step of the screw part. The advantage here is that the bushing drains away any oil that has entered.

[0021] In an advantageous embodiment, the bushing has at least one first axially continuous opening that opens into the transmission interior. This is advantageous because, in the event of excess pressure, air or an air-oil mixture can enter the bushing, allowing the settled oil to flow back into the transmission interior through second openings.

[0022] In an advantageous embodiment, the bushing has at least a second radially through opening which opens into an annular gap formed between the screw part and the bushing, which opens into the interior of the gearbox. The advantage here is that the oil which settles within the bushing can be drained back into the interior of the gearbox. The second opening does not open directly into the interior of the gearbox but into an annular gap between the screw part and the bushing, wherein the annular axis of the annular gap is aligned parallel to the screw axis of the screw part and / or parallel to the vertical direction and the annular gap opens into the interior of the gearbox at its axial end region facing away from the protective cap or the cutting disc.

[0023] In an advantageous design, the permeability of the grid is much lower than that of the openings. This has the advantage of preventing oil from passing through the grid and then escaping into the environment.

[0024] In an advantageous embodiment, the clear diameter of the respective grid openings of the grid is smaller than the clear diameter of the openings, in particular the smallest clear diameter of the openings. This has the advantage of making it more difficult for oil to pass through the grid.

[0025] In an advantageous embodiment, the filter element is inserted into a circumferentially continuous annular groove in the cutting disc. This allows for easy attachment.

[0026] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art. The invention will now be explained in more detail with reference to schematic illustrations:

[0027] Figure 1 shows a transmission according to the invention with a splitting housing and a venting device 1, in particular a pressure compensation element or venting screw, wherein the transmission is at least partially filled with oil.

[0028] Figure 2 shows a side view of the venting device 1, in particular the pressure compensation element.

[0029] In Figure 3, the venting device 1 is shown exploded in an oblique view.

[0030] Figure 4 shows a sectional view of the venting device 1, in particular the pressure compensation element.

[0031] Figure 5 shows the venting device 1 exploded in side view.

[0032] As shown in the figures, the housing of the gearbox has a lower part 3, onto which an upper part 2 of the gearbox is placed.

[0033] The bearing receptacles for the bearings of the input and output shafts are arranged partially, in particular half each, in the lower part 3 and partially, in particular half each, in the upper part 2. Thus, with the upper part 2 removed, the bearings can be inserted into the part of the respective bearing receptacle formed in the lower part 3, and then the upper part 2 can be placed.

[0034] The gearbox is at least partially filled with oil, in particular with the oil level being arranged below the splitting plane, i.e. below the contact plane between upper part 2 and lower part 3.

[0035] However, during operation, the oil is sprayed throughout the interior, reaching, in particular, the inside of the upper part 2. To equalize the pressure with the ambient air of the gearbox, a venting device 1 is provided, which is screwed into a bore through the upper part 2. Thus, when the temperature rises, particularly during operation, air escapes from the interior of the gearbox and flows from the environment into the interior of the gearbox when the temperature drops, so that the air pressure difference between the interior of the gearbox and the ambient air of the gearbox becomes negligible.

[0036] For this purpose, the venting device 1 has an annular screw part 37, which is screwed with its external thread into the through threaded bore of the upper part 2.

[0037] This screw part 37 has an external thread with which it can be screwed into the threaded hole of the upper part 2.

[0038] The screw part 37 has an axially projecting collar which extends completely around the circumference and into which a spacer ring 36 is inserted, onto which a grid 35, in particular a metal grid, is placed, onto which a sealing ring 34 is placed.

[0039] A separating disc 37 has projections 40 projecting towards the sealing ring 34, which are pressed against the inner edge of the collar in an elastically prestressed manner.

[0040] The cutting disc 37 is thus located above the sealing ring 34, whereby the projections 40 press the sealing ring 34 onto the grid 35, which rests against a step of the screw part 37 via the spacer ring 36.

[0041] The cutting disc 37 has axially continuous recesses 39, in particular parallel to the bore axis of the threaded bore and / or to the screw axis of the screw part 37, which are arranged radially spaced and radially outside a likewise axially continuous central bore of the screw part 37.

[0042] A hollow cylindrical filter element 32 is placed on the separating disc 37 and is surrounded by a protective cap 31, which is placed on the collar and thus connected to the separating disc 37. A bushing 38, which has a collar region projecting radially outward, is inserted into the screw part and projects axially at the end region of the screw part 37 facing away from the protective cap 31, wherein the collar region rests against a step of the screw part 37.

[0043] The bushing 38 has openings towards the interior of the gearbox so that oil can penetrate into the bushing 38.

[0044] However, the transmittance of the grid 35 is much lower than the transmittance of the openings.

[0045] In this way, ventilation is achieved, especially when the oil splashes onto the ceiling on the inside of the gearbox.

[0046] In particular, the bushing 38 has a first, axially continuous opening at its end region facing away from the protective cap 31.

[0047] Above this first opening, i.e. closer to the separating disk 33, the bushing 38 has one or more second, radially extending openings so that oil which has penetrated can flow radially out of the bushing 38 into an annular gap which is formed between the bushing 38 and the screw part 37 and opens into the interior of the transmission.

[0048] Escaping air penetrates the grille 35 and the filter element 32 and then enters the environment between the filter element 32 and the inside of the protective cap 31.

[0049] The grid openings of the grid 35 have a smaller clear diameter than the, in particular smallest, clear diameter of the openings.

[0050] Preferably, the filter element 32 is made of cotton. The separating disc 33 can be made of metal, and the protective cap 1 and the screw part 37 can be made of metal.

[0051] The venting device 1 is thus arranged in the upper part 2 above the oil level and is thus only exposed to splashing oil. In further embodiments according to the invention, the protective cap 1 is made of plastic. In particular, the separating disc 33 can be made of plastic.

[0052] List of reference symbols

[0053] 1 Venting device, in particular pressure compensation element or vent screw 2 Upper part

[0054] 3 Lower part

[0055] 31 Protective cap

[0056] 32 filter element

[0057] 33 Cutting disc 34 Sealing ring

[0058] 35 Grilles, especially metal grilles

[0059] 36 spacer ring

[0060] 37 screw part

[0061] 38 Bushing 39 Recess

[0062] 40 lead

Claims

Patent claims:

1. Gearbox, wherein the housing of the gearbox has a lower part and an upper part which is placed on the lower part, in particular wherein a seal, in particular a flat seal, is arranged between the lower part and the upper part, characterized in that a venting device of the gearbox is arranged in a through threaded bore of the upper part.

2. Gearbox according to claim 1, characterized in that the gearbox is at least partially filled with oil, in particular wherein the oil level is arranged below the venting device and / or the oil level is arranged below the splitting plane of the gearbox, in particular therefore below the contact plane between the upper part and the lower part.

3. Gearbox according to one of the preceding claims, characterized in that the venting device has an annular screw part which is screwed into the threaded bore.

4. Gearbox according to one of the preceding claims, characterized in that the screw part has an axially projecting collar.

5. Gearbox according to one of the preceding claims, characterized in that the projections formed axially projecting on a cutting disc rest elastically prestressed on the inside of the collar, in particular wherein the projections are spaced from one another in the circumferential direction, in particular in the circumferential direction with respect to the screw axis of the screw part.

6. Gearbox according to one of the preceding claims, characterized in that a grid, in particular a spacer ring, a grid and a sealing ring, is arranged radially inside the collar, wherein the projections press the grid against a step of the screw part, in particular wherein the projections press the sealing ring onto the grid, which is thus pressed onto the spacer ring, which is thereby pressed against a step of the screw part.

7. A transmission according to any one of the preceding claims, characterized in that the grid is arranged radially inside the collar.

8. Gearbox according to one of the preceding claims, characterized in that the cutting disc has axially continuous recesses which are spaced apart from one another in the circumferential direction and which are radially spaced from an axially continuous central bore of the cutting disc, in particular wherein the further recesses are arranged radially outside the central bore.

9. Gearbox according to one of the preceding claims, characterized in that a hollow cylindrical filter element is fitted onto the separating disc, in particular wherein the cylinder axis of the hollow cylindrical filter element is aligned coaxially with the screw axis.

10. Gearbox according to one of the preceding claims, characterized in that the filter element is radially surrounded by a protective cap which is placed on the collar, in particular and is held elastically.

11. Gearbox according to one of the preceding claims, characterized in that a bushing, which has a radially outwardly projecting collar region, is inserted into the screw part and projects axially at the end region of the screw part facing away from the protective cap, wherein the collar region bears against a step of the screw part.

12. Transmission according to one of the preceding claims, characterized in that the bushing has at least one first axially through opening which opens into the transmission interior.

13. Gearbox according to one of the preceding claims, characterized in that the bushing has at least one second radially through opening which opens into an annular gap formed between the screw part and the bushing, which opens into the interior of the gearbox.

14. Gearbox according to one of the preceding claims, characterized in that the transmission capacity of the grid is much lower than the transmission capacity of the openings and / or that the clear diameter of the respective grid openings of the grid is smaller than the clear diameter of the openings, in particular than the smallest clear diameter of the openings.

15. Gearbox according to one of the preceding claims, characterized in that the filter element is inserted into an annular groove of the separating disc which is continuous in the circumferential direction.

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