Transmission having a housing

Abstract

The invention relates to a transmission having a housing, said housing having a lower part and an upper part which is placed on the lower part. An oil pump, in particular a shaft end pump, which is driven by the input shaft of the transmission, suctions oil from the interior of the transmission via an oil line and a valve, wherein the valve is positioned below the oil level, in particular in the gravitational direction, and the oil pump is positioned above the oil level, in particular in the gravitational direction.

Description

[0001] Gearbox comprising a housing

[0002] Description:

[0003] The invention relates to a transmission comprising a housing.

[0004] It is common knowledge that a gearbox has components that need to be lubricated, such as bearings or meshing areas of gears.

[0005] The closest prior art known from CN 114439 911 A is a gearbox.

[0006] An oil pressure supply unit is shown in US 2023 / 0 026 991 A1.

[0007] A filter for transmissions is known from US 2003 / 0 040 391 A.

[0008] An oil pump for a transmission is known from US 5 901 802 A.

[0009] A gearbox with housing parts is known from DE 102023001 459 A1.

[0010] A gearbox with a housing part is known from DE 102012 022 023 A1.

[0011] A gearbox is known from DE 102005053 772 A1.

[0012] The invention is therefore based on the object of developing a transmission in which lubrication is to be ensured even when the transmission is restarted.

[0013] According to the invention, the object is achieved in the transmission according to the features specified in claim 1.

[0014] Important features of the invention in the transmission comprising a housing are that the housing has a lower part and an upper part placed on the lower part, wherein an oil pump, in particular a shaft end pump, driven by the input shaft of the transmission sucks oil from the interior of the transmission via an oil line and a valve, wherein the valve is arranged below the oil level, in particular in the direction of gravity, wherein the oil pump is arranged above the oil level, in particular in the direction of gravity.

[0015] The advantage of this is that the valve prevents the oil line from running dry when the transmission is stopped. This ensures that the oil pump is supplied with oil when the transmission restarts, allowing it to immediately pump oil and thus supply the components requiring lubrication with oil as quickly as possible.

[0016] In an advantageous embodiment, the valve is a one-way valve, in particular a check valve. This prevents the oil line from running dry when the transmission is at a standstill, thus allowing lubrication to resume as quickly as possible when the transmission restarts.

[0017] In an advantageous embodiment, the rotational axis of the input shaft is arranged in the parting plane, in particular the splitting plane, between the upper part and the lower part, in particular with a first half of the bearing receptacle of a bearing of the input shaft being formed in the lower part and the other half of the bearing receptacle of the bearing being formed in the upper part. This is advantageous because the bearings to be lubricated are located at the height of the parting plane, thus requiring only a small amount of pumping power from the oil pump located in the parting plane to lubricate the bearings.

[0018] In an advantageous design, the parting plane intersects the space occupied by the oil pump. This is advantageous because the oil pump only needs to generate a small amount of pumping power to ensure lubrication of the components to be lubricated located in the parting plane.

[0019] In an advantageous embodiment, the oil line leads from the oil pump to the valve, and the valve is connected in an oil-tight manner to a recess through the wall of the lower part, in particular directly or via a nozzle extending into the recess. This advantageously includes the fact that the oil line is located outside the housing, thus allowing the pumped oil to be cooled by the ambient air. Furthermore, the oil line is prevented from running idle, thus ensuring that cooled oil is immediately available for lubrication when the transmission restarts.

[0020] In an advantageous embodiment, the oil line is designed to meander. The advantage here is that the extension of the oil line allows for improved cooling. This is because the oil line is located on the outside of the transmission and preferably spaced from the transmission surface. This allows for efficient cooling.

[0021] In an advantageous embodiment, the oil line is connected to a suction port, in particular the inlet, of the oil pump, with a transparent area and / or a sensor for detecting oil being arranged at the suction port. The advantage here is that the transparent area acts as a viewing window, thus enabling monitoring of the oil level in the oil line. Running dry in the oil line is thus easily detectable. Alternatively or additionally, a sensor can be used to automate this monitoring.

[0022] In an advantageous embodiment, an additional oil line leads from the pressure connection, in particular the outlet, of the oil pump to a further recess extending through the wall of the upper part. Advantageously, the additional recess can be arranged directly above the recess in the lower part without any lateral offset, so that the largest possible gearing part can be connected in a rotationally fixed manner to the input shaft, or so that the largest possible distance between the two recesses and a gearing part that is connected in a rotationally fixed manner to the input shaft can be achieved, so that the oil delivery is disrupted as little as possible by the rapidly rotating gearing part.

[0023] In an advantageous embodiment, the valve has a sleeve, in particular which is screwed onto the nozzle, in particular and is connected in an oil-tight manner. This is advantageous in that the valve can be connected to the gearbox securely and in an oil-tight manner. The sleeve forms a housing for the parts arranged within the sleeve. In an advantageous embodiment, the valve has a tappet which projects through a first recess arranged centrally in an annular part and is guided in this first recess, in particular wherein the first recess functions as a plain bearing. This is advantageous in that the tappet can be moved back and forth in the axial direction, i.e. in the direction of the annular axis of the annular part.

[0024] In an advantageous additional embodiment, the ring part is connected to the sleeve, in particular in an oil-tight, particularly detachable manner, and is not only inserted but also externally toothed, with its external toothing screwed into the internal toothing of the sleeve. This is advantageous because the ring part is tightly and securely fixed in the sleeve.

[0025] In an advantageous embodiment, the ring part has additional recesses that are spaced apart from one another in the circumferential direction relative to the ring axis. The advantage here is that the additional recesses allow oil to flow through.

[0026] In an advantageous embodiment, the tappet has a widened tappet head which, when it rests against the ring part, covers the additional recesses, in particular in an oil-tight manner. The additional recesses are radially spaced from the first recess, in particular the radial distance area covered by the first recess relative to the ring axis is spaced from the radial distance area covered by the additional recesses. This is advantageous in that the oil flow can only be released by appropriate axial positioning of the tappet.

[0027] In an advantageous embodiment, a spring element supported on the ring part presses against a support ring resting on a retaining ring, wherein the retaining ring is embedded in an annular groove of the tappet, in particular in such a way that the further recesses are covered by the tappet head, in particular in an oil-tight manner. The advantage here is that when there is no suction pressure from the oil pump, the widened tappet head closes the further recesses and thus prevents oil from flowing through the ring part. However, if the suction pressure overcomes the spring force generated by the spring element, oil flow is permitted. In an advantageous embodiment, a further retaining ring is embedded in an inner groove of the sleeve, which restricts the tappet, in particular in the direction of the ring axis of the ring part. The advantage here is that the tappet can be moved back and forth between the stop of the tappet head on the ring part and the stop on the further retaining ring.

[0028] 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.

[0029] The invention will now be explained in more detail using schematic illustrations:

[0030] Figure 1 shows an oblique view of a transmission according to the invention.

[0031] Figure 2 shows the gearbox in side view.

[0032] Figure 3 shows the arrangement of an oil pump 2 and a valve 1 relative to the oil level 30.

[0033] Figure 4 shows the arrangement in an oblique view.

[0034] Figure 5 shows a cross section of the valve 1.

[0035] In Figure 6, valve 1 is shown in an exploded oblique view.

[0036] As shown in the figures, the transmission comprises a housing having a lower part 3 and an upper part 4 mounted on the lower part 3. Thus, the transmission is preferably designed with a split housing as the housing.

[0037] The parting plane, in particular the splitting plane, between the lower part 3 and the upper part 4, i.e. the contact plane of the two parts, also includes the axes of rotation of the input shaft 20 and the output shaft 5 of the gearbox.

[0038] The lower section 3 is partially filled with oil and positioned horizontally. The oil level 30 is thus located below the parting line.

[0039] The bearing mount of each input shaft bearing is bisected by the parting plane. Thus, each bearing is housed half in the lower part 3 and the other half in the upper part 4.

[0040] Preferably, an oil pump 2 is driven by the input shaft 20. This is because the input shaft 20 is the fastest-rotating shaft of the transmission, and thus the oil pump 2 achieves a high delivery rate. The oil pump 2 is located above the oil level 30, is intersected by the parting plane, and draws in the oil via an oil line in which a valve 1, in particular a one-way valve, in particular a check valve, is arranged and which leads through the wall of the lower part 3 into the oil sump of the transmission. For this purpose, the wall of the lower part 3 has a continuous recess.

[0041] The valve 1 is arranged below the oil level 30. Preferably, the valve 1 is arranged at the height of the recess. In particular, the central axis of the recess intersects the valve 1.

[0042] In particular, the area covered by the valve in the vertical direction overlaps with the area covered by the recess in the vertical direction.

[0043] The area covered by the oil pump 2 in the vertical direction overlaps with the area covered by the driving shaft 20 in the vertical direction.

[0044] However, the valve 1 is preferably not arranged directly below the oil pump 2, but rather on the side of the input shaft 20 facing away from the output shaft in the transverse direction, wherein the transverse direction is aligned parallel to the parting plane and perpendicular to the axis of rotation of the input shaft 20.

[0045] As a result of the valve 1, the oil line does not empty even when the driving shaft 20 is at a standstill, so that when the driving shaft 20 is subsequently restarted, the oil pump 2 can suck in the oil in the intake area and does not have to suck in air.

[0046] The oil pumped by the oil pump 2 is preferably guided through a further oil line which opens into the interior of the gearbox through a further recess in the upper part 4.

[0047] As shown in Figures 5 and 6, the valve 1 has a sleeve 51, which has a connection for the oil line to which the oil line is connected. At its other end, the sleeve 51 is connected to the lower part 3, so that the oil can flow into the valve through the recess in the lower part 3.

[0048] In the sleeve 51, a ring part 54 is accommodated, which has a first, centrally arranged, through the

[0049] Ring part 54 has a continuous recess through which a plunger 53 projects and is guided during its linear back and forth movement, in particular parallel to the ring axis.

[0050] Further recesses passing through the ring part 54 are radially spaced from the first recess with respect to the ring axis of the ring part 54.

[0051] The plunger 53 is limited in its back and forth movement on the one hand by the ring part 54 in that the head, which is widened on the plunger 53, rests against the ring part 54 and thereby covers the ring part 54 in an oil-tight manner, in particular so that no oil can flow through the ring part 54.

[0052] On the other hand, the tappet is delimited by a retaining ring 57 and a support ring 56 adjacent thereto, but in this case, no oil-tight stop is provided. In particular, in the latter case, oil can flow around the tappet head within the sleeve 51.

[0053] The retaining ring 57 is clipped into an annular groove on the tappet 53, against which the support ring 56 rests, which has a larger outer diameter than the retaining ring 57.

[0054] A spring element, in particular an annular spring, placed on the tappet is supported on the retaining ring 57 and presses on the other hand on the support ring 56.

[0055] In this way, the tappet head of the tappet 53, which is widened on the tappet 53, is pressed against the retaining ring 57 to close the ring part 54, in particular together with the further recesses, as long as the suction pressure of the oil pump 2 is not so strong that, contrary to the spring force generated by the spring element 55, the tappet 53 with its tappet head is driven away from the ring part 54, in particular and thus the valve releases the oil flow.

[0056] Preferably, the further recess in the upper part 4 is arranged vertically directly above the recess in the lower part 3, in particular without lateral or transverse offset. In this way, a large gear can be connected to the input shaft 20 in a rotationally fixed manner without disrupting the oil flow entering and exiting the transmission interior. A viewing window is preferably arranged in the oil line, in particular next to or directly next to the oil pump, in particular at the intake port of the oil pump. In this way, the function of the valve 1 can be checked when the input shaft 20 is stationary. Alternatively or additionally, an oil detection sensor can also be arranged on the oil line in the area of ​​the intake port of the oil pump and / or next to or directly next to the oil pump 2.In this way, the sensor signal can be fed to a control system, which displays and / or forwards a warning signal in the event of a lack of oil and thus indirectly monitors the function of valve 1.

[0057] In particular, the oil line leads from the oil pump 2 to the valve 1, and the valve 1 is connected in an oil-tight manner to a recess extending through the wall of the lower part, in particular via an angled pipe socket extending into the recess. This is advantageous because the oil line is located outside the housing, thus preventing the pumped oil from being cooled by the ambient air. Furthermore, the oil line is prevented from running idle, thus ensuring that cooled oil is immediately available for lubrication when the transmission restarts.

[0058] In further embodiments of the invention, the oil line is designed to meander from the recess of the lower part 3 to the oil pump 2. In this way, a cooling effect can be achieved.

[0059] In further embodiments according to the invention, the sleeve 51 is designed with an internal toothing and the ring part 54 is designed with external teeth and is screwed into the internal toothing in order to enable an even more secure connection of the sleeve 51 to the ring part 54.

[0060] List of reference symbols

[0061] 1 Valve, especially one-way valve 2 Oil pump

[0062] 3 Lower part

[0063] 4 Top

[0064] 5 drifting shaft

[0065] 20 driving shaft 30 oil level

[0066] 51 sleeve

[0067] 52 Retaining ring

[0068] 53 plungers

[0069] 54 Ring part 55 Spring element, in particular ring spring

[0070] 56 support ring

[0071] 57 Retaining ring

Claims

Patent claims:

1. A transmission comprising a housing, the housing having a lower part and an upper part placed on the lower part, an oil pump, in particular a shaft end pump, driven by the input shaft of the transmission, sucking oil from the interior of the transmission via an oil line and a valve, characterized in that the valve is arranged below the oil level, in particular in the direction of gravity, the oil pump being arranged above the oil level, in particular in the direction of gravity.

2. Transmission according to claim 1, characterized in that the valve is a one-way valve, in particular a check valve.

3. Gearbox according to one of the preceding claims, characterized in that the axis of rotation of the input shaft is arranged in the parting plane, in particular splitting plane, between the upper part and the lower part, in particular wherein a first half of the bearing receptacle of a bearing of the input shaft is formed in the lower part and the other half of the bearing receptacle of the bearing is formed in the upper part.

4. Transmission according to one of the preceding claims, characterized in that the parting plane intersects the spatial area occupied by the oil pump.

5. Transmission according to one of the preceding claims, characterized in that the oil line leads from the oil pump to the valve and the valve is connected in an oil-tight manner to a recess passing through the wall of the lower part, in particular directly or via a nozzle projecting into the recess.

6. Transmission according to one of the preceding claims, characterized in that the oil line is designed to be meandering.

7. Transmission according to one of the preceding claims, characterized in that the oil line is connected to a suction connection, in particular inlet, of the oil pump, wherein a transparent area and / or a sensor for detecting oil is arranged at the suction connection.

8. Transmission according to one of the preceding claims, characterized in that a further oil line leads from the pressure connection, in particular outlet, of the oil pump to a further recess passing through the wall of the upper part.

9. Transmission according to one of the preceding claims, characterized in that the valve has a sleeve, in particular which is screwed onto the nozzle, in particular and is connected in an oil-tight manner.

10. Transmission according to one of the preceding claims, characterized in that the valve has a tappet which projects through a first recess arranged centrally in an annular part and is guided in this first recess, in particular wherein the first recess functions as a plain bearing.

11. Gearbox according to one of the preceding claims, characterized in that the ring part is connected to the sleeve, in particular in an oil-tight manner, in particular detachably, in particular the ring part is screwed with its external toothing into an internal toothing of the sleeve, in particular to improve the tightness.

12. Transmission according to one of the preceding claims, characterized in that the ring part has further recesses which are spaced apart from one another in the circumferential direction with respect to the ring axis.

13. Gearbox according to one of the preceding claims, characterized in that the tappet has a widened tappet head which, when it rests against the ring part, covers the further recesses, in particular in an oil-tight manner, wherein the further recesses are radially spaced from the first recess, in particular the radial distance range covered by the first recess and related to the ring axis is spaced from the radial distance range covered by the further recesses.

14. Gearbox according to one of the preceding claims, characterized in that a spring element supported on the ring part presses on a support ring resting on a retaining ring, wherein the retaining ring is let into an annular groove of the tappet, in particular so that the further recesses are covered by the tappet head, in particular in an oil-tight manner.

15. Gearbox according to one of the preceding claims, characterized in that a further retaining ring is embedded in an inner groove of the sleeve, which restricts the tappet, in particular in the direction of the ring axis of the ring part.

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