Gearbox housing and automotive gearbox

Abstract

Gearbox housing (1) for a motor vehicle transmission, the gearbox housing (1) comprising an interior (2) for receiving movable gearbox components and a ventilation arrangement (3) for venting the interior (2) with respect to an surrounding atmosphere, the ventilation arrangement (3) comprising a ventilation channel (8) with an interior ventilation channel inlet (12), wherein the ventilation arrangement (3) has a collection chamber (9) upstream of the ventilation channel inlet (12) with a collection chamber outlet (11), and motor vehicle transmissions with movable gearbox components and such a gearbox housing (1).

Description

[0001] The invention relates to a transmission housing for a motor vehicle transmission, the transmission housing comprising an interior space for accommodating movable transmission components and a venting arrangement for venting the interior space with respect to the surrounding atmosphere. The venting arrangement comprises a venting channel with a venting channel inlet on the interior side. Furthermore, the invention relates to a motor vehicle transmission with movable transmission components.

[0002] The document DE 10 2019 204 907 A1 relates to a transmission for a commercial vehicle with a transmission housing on which at least one venting arrangement is provided for pressure equalization between an interior of the transmission housing and an environment of the transmission housing, which venting arrangement has a vent attached to a wall of the transmission housing on the environment side, which vent is connected to at least one interior of the transmission housing via at least one oil foam-reducing venting channel.In order to ensure a particularly structurally simple and cost-effective venting arrangement, the document DE 10 2019 204 907 A1 proposes to provide at least one first interior-side venting bore and a second venting-side venting bore as the venting channel, wherein the venting bores are arranged offset from one another with respect to their cross-section at their connecting region in such a way that a step-like transition is provided at the connecting region between the venting bores.

[0003] The invention is based on the object of structurally and / or functionally improving a transmission housing mentioned above. Furthermore, the invention is based on the object of structurally and / or functionally improving a motor vehicle transmission mentioned above.

[0004] The object is achieved by a transmission housing having the features of claim 1. Furthermore, the object is achieved by a motor vehicle transmission having the features of claim 12. Advantageous embodiments and / or further developments are the subject of the subclaims.

[0005] The transmission housing is designed and / or can be arranged for use as a motor vehicle transmission housing. The transmission housing has an interior space. The interior space is designed to accommodate movable transmission components. Unless otherwise stated or the context indicates otherwise, directional information, in particular the information “top”, “bottom”, “above”, “below”, “lateral”, “horizontal” and “vertical”, refer to an arrangement of the transmission housing on a motor vehicle on a level, gradient-free roadway. “Top”, “bottom”, “above”, “below” and “vertical” then refer to a direction perpendicular to the roadway. “Lateral” and “horizontal” then refer to a direction parallel to the roadway.

[0006] The transmission housing can have a housing wall. The housing wall can form an outer housing wall or a housing outer wall section. The housing wall can form an inner housing wall or a housing inner wall section. The transmission housing can have an intermediate wall. The intermediate wall can be firmly connected to the housing wall. The intermediate wall can initially be manufactured separately from the housing wall and subsequently firmly connected to the housing wall, for example by screwing. The intermediate wall can form an inner housing wall or a housing inner wall section. The intermediate wall can be plate-shaped. The interior can have at least one functional chamber. The at least one functional chamber can be designed to accommodate a lubricant and / or coolant, in particular a transmission oil. The interior can have a plurality of functional chambers. Functional chambers can be spatially separated from one another.Functional spaces can be separated from one another by housing interior walls or housing interior wall sections. Functional spaces can be connected to one another in a communicating manner. The at least one functional space can be a main space. The main space can be designed and / or arranged to accommodate gear sets and shifting elements. The at least one functional space can be an intermediate space. The intermediate space can be designed and / or arranged to accommodate a power take-off. The transmission housing, the housing wall, and / or the intermediate wall can be manufactured using a casting process.

[0007] The transmission housing has a venting arrangement. The venting arrangement is designed and / or arranged to vent the interior. The venting arrangement can be designed and / or arranged to vent a functional space. The venting arrangement is designed and / or arranged to vent with respect to a surrounding atmosphere.

[0008] The venting arrangement has a venting duct. The venting duct can be designed and / or arranged to separate coolant and / or lubricant, in particular transmission oil, from a venting airflow. The venting duct can be designed and / or arranged to calm, defoam, and / or return coolant and / or lubricant, in particular transmission oil, to the collecting chamber. The venting duct has a venting duct inlet on the interior side. The venting duct inlet can be arranged on the collecting chamber side. The venting duct can have a venting duct outlet on the atmosphere side. The venting duct can have a round cross-section. The venting duct can have an at least approximately horizontally extending first venting duct section. The venting duct inlet can be arranged on the first venting duct section.The vent channel may have a second vent channel section. The vent channel outlet may be arranged on the second vent channel section. The first vent channel section and the second vent channel section may be arranged at an angle to one another. The second vent channel section may extend at least approximately perpendicularly. The vent channel, the first vent channel section, and / or the second vent channel section may be designed as a bore.

[0009] The venting arrangement has a collecting chamber. The collecting chamber can be designed and / or arranged to collect coolant and / or lubricant, in particular transmission oil. The collecting chamber can be designed and / or arranged to separate coolant and / or lubricant, in particular transmission oil, from a venting airflow. The collecting chamber can be designed and / or arranged to calm, defoam, and / or return coolant and / or lubricant, in particular transmission oil, to the interior. The collecting chamber is located upstream of the venting duct inlet. The collecting chamber can be located upstream of the venting duct inlet in the venting direction. The collecting chamber has a collecting chamber outlet. The collecting chamber outlet can be arranged on the venting duct side or on the atmosphere side. The collecting chamber outlet can have a rectangular or trapezoidal cross-section with rounded corners.The collection chamber can have a collection chamber inlet. The collection chamber inlet can be arranged on the throttle channel side or on the interior side. The collection chamber can have a half-shell-like volume. The collection chamber can have a bottom section. The bottom section can delimit the collection chamber at the bottom. The collection chamber can have a back section. The back section can delimit the collection chamber laterally. The back section can be arranged opposite the collection chamber outlet. The collection chamber can have an edge section. The edge section can delimit the collection chamber outlet.

[0010] The venting arrangement can have a throttle channel. The throttle channel can be designed and / or arranged to separate coolant and / or lubricant, in particular transmission oil, from a venting airflow. The throttle channel can be designed and / or arranged to calm, defoam and / or return coolant and / or lubricant, in particular transmission oil, to the interior. The throttle channel can be arranged upstream of the collecting chamber. The throttle channel can be arranged upstream of the collecting chamber in the venting direction. The throttle channel can have a throttle channel inlet and a throttle channel outlet. The throttle channel inlet can be arranged on the interior side. The throttle channel outlet can be arranged on the collecting chamber side or on the atmosphere side. The throttle channel can have an at least approximately constant cross-section. The throttle channel can have a round cross-section. The throttle channel can have a cross-section with a clear width of approx.1 mm to approximately 4 mm, especially approximately 2 mm. The throttle channel can be straight. The throttle channel can be designed as a bore.

[0011] The collecting space outlet and the vent duct inlet can be arranged adjacent to one another. The collecting space outlet and the vent duct inlet can be connected to one another. The collecting space outlet can have a larger cross-section than the vent duct inlet. The collecting space outlet can have a larger clear width than the vent duct inlet. The collecting space outlet can have a mean cross-section that corresponds to approximately 1.2 to approximately 2.5 times, in particular approximately 1.6 to approximately 2 times, the cross-section of the vent duct inlet. A step can be formed between the collecting space outlet and the vent duct inlet.

[0012] The vent duct inlet may have a peripheral edge. The peripheral edge may be exposed toward the collecting chamber outlet. The peripheral edge may be formed between an inner surface of the vent duct and an end face. The peripheral edge may have an edge angle of approximately 90°. The peripheral edge may be sharp-edged and / or unrounded.

[0013] The throttle duct outlet can open into the collection chamber. The throttle duct outlet can open into the collection chamber below the vent duct inlet. The throttle duct outlet can open into the collection chamber at the bottom section and / or at the back section. The throttle duct outlet can open into the collection chamber at a lowest section of the collection chamber and / or at the section furthest from the collection chamber outlet. The throttle duct inlet can be arranged below the throttle duct outlet. The throttle duct can run at an angle from the collection chamber to the interior space.

[0014] The throttle channel inlet and / or the throttle channel outlet can have a peripheral edge. The peripheral edge of the throttle channel inlet can be exposed toward the interior. The peripheral edge of the throttle channel outlet can be exposed toward the collecting space. The peripheral edge can be formed between an inner surface of the throttle channel and an end face. The peripheral edge can have an edge angle of approximately 90°, at least in sections. The peripheral edge can be sharp-edged and / or unrounded, at least in sections.

[0015] The collecting chamber can be formed in the housing wall. The collecting chamber can be formed in the partition wall. The collecting chamber can be integrated into the housing wall or the partition wall. The collecting chamber can be manufactured during the production of the housing wall or the partition wall. The housing wall or the partition wall can be manufactured together with the collecting chamber. The collecting chamber can be manufactured using a casting process. The collecting chamber can be incorporated into the housing wall or the partition wall after the production of the housing wall or the partition wall. The collecting chamber can be manufactured using a material-removing process.

[0016] The motor vehicle transmission can be a truck transmission, a commercial vehicle transmission, an agricultural machinery transmission, a construction machinery transmission, a bus transmission, or a passenger car transmission. The motor vehicle transmission has moving transmission components. The moving transmission components can be gear sets and shift elements. The motor vehicle transmission has the transmission housing.

[0017] In summary, and in other words, the invention thus provides, among other things, a vent with an integrated oil reservoir. The oil reservoir can also be referred to as an oil chamber collection chamber or oil chamber. An escaping oil flow can be throttled through a throttle bore and collected by a separate oil chamber collection chamber in the transmission. The oil chamber can be integrated either into a cast housing or into another component, e.g., an intermediate plate (front transmission wall).

[0018] The invention reduces or prevents an operational pressure increase in the interior. Leakage of coolant and / or lubricant, particularly transmission oil, from the interior is reduced or prevented. Functionality is improved. Expenses, such as assembly and / or maintenance, are reduced. A vent, such as a diaphragm vent, can be eliminated.

[0019] In the following, embodiments of the invention are described in more detail with reference to figures, which show schematically and by way of example: Fig. 1 a section of a gearbox housing with an interior and a ventilation arrangement with a ventilation channel, a collecting chamber and a throttle channel and Fig. 2 a collection room in detailed view.

[0020] Fig. 1 shows a transmission housing 1 with an interior space 2 and a ventilation arrangement 3 in a position corresponding to an arrangement of the transmission housing 1 on a motor vehicle on a level, gradient-free roadway. The transmission housing 1 is designed for use as a motor vehicle transmission housing and has a housing wall 4 and an intermediate wall 5. By means of the intermediate wall 5, the interior space 2 is divided into a main space 6, which is designed to accommodate transmission gear sets and shift elements, and an intermediate space 7, which is designed, for example, to accommodate a power take-off. The main space 6 and the intermediate space 7 are designed to hold transmission oil and are connected to one another in a communicating manner. During operation of the motor vehicle transmission, transmission oil is relatively strongly swirled and foamed in the main space 6, while the intermediate space 7 is oil-calmed.

[0021] The venting arrangement 3 has a venting channel 8, a collecting chamber 9 upstream of the venting channel 8, and a throttle channel 10 upstream of the collecting chamber 9. The throttle channel 10 is arranged in the intermediate wall 5 and, starting from the intermediate space 7, leads diagonally upwards into the collecting chamber 9. The collecting chamber 9 is integrated into the intermediate wall 5, which is produced using a casting process, and has a half-shell-like volume open towards the venting channel 8, comprising a base section, a back section, and a collecting chamber outlet 11. The venting channel 8 has a venting channel inlet 12 with a sharp-edged peripheral edge 13, a horizontally extending first venting channel section, a vertically extending second venting channel section, and a venting channel outlet 14.The collecting chamber outlet 11 has a significantly larger cross-section than the vent duct inlet 12, so that the peripheral edge 13 is completely exposed and a circumferential step 15 is formed between the collecting chamber outlet 11 and the vent duct inlet 12. The throttle duct 10 has a throttle duct outlet 16. The throttle duct 10 opens into the collecting chamber 9 with its throttle duct outlet 16 below the vent duct inlet 12 at a lowest section of the collecting chamber 9 that is furthest away from the collecting chamber outlet 11. Fig. 2 shows the collecting chamber 9 with a view through the collecting chamber outlet 11 to the opposite back section and the throttle channel 10.

[0022] When the motor vehicle transmission is in operation, if there is an operational pressure increase in the interior 2, venting occurs starting from the intermediate space 7, initially via the throttle channel 10 into the collecting space 9. Due to the pressure difference caused by the throttling effect, only a small amount of transmission oil is entrained, any entrained transmission oil collects in the collecting space 9, and the rising profile of the throttle channel 10 enables or supports a return flow of transmission oil into the intermediate space 7. Furthermore, a venting flow past the peripheral edge 13 into the venting channel 8 and, changing direction against gravity, upwards through the first venting channel section and the second venting channel section to the venting channel outlet 14. Due to the effective transmission oil retention or return of the venting arrangement 3, a separate diaphragm vent at the venting channel outlet 14 can be dispensed with. Reference symbol 1 gearbox housing 2 Interior 3 Ventilation arrangement 4 Housing wall 5 Partition wall 6 Main room 7 gap 8 Ventilation duct 9 Reception room 10 throttle channel 11 Collecting chamber outlet 12 Ventilation duct inlet 13 Perimeter edge 14 Ventilation duct outlet 15th level 16 throttle channel outlet QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2019 204 907 A1

[0002]

Claims

[1] Gearbox housing (1) for a motor vehicle transmission, the gearbox housing (1) having an interior space (2) for accommodating movable transmission components and a venting arrangement (3) for venting the interior space (2) with respect to a surrounding atmosphere, the venting arrangement (3) having a venting channel (8) with an interior-side venting channel inlet (12), characterized by that the venting arrangement (3) has a collecting chamber (9) upstream of the venting duct inlet (12) with a collecting chamber outlet (11). [2] Gearbox housing (1) according to claim 1, characterized by that the venting arrangement (3) has a throttle channel (10) upstream of the collecting space (9) with a throttle channel inlet and a throttle channel outlet (16). [3] Gearbox housing (1) according to at least one of the preceding claims, characterized bythat the collecting space outlet (11) and the ventilation duct inlet (12) are connected to one another and the collecting space outlet (11) has a larger cross-section than the ventilation duct inlet (12). [4] Gearbox housing (1) according to at least one of the preceding claims, characterized by that the ventilation channel inlet (12) has a peripheral edge (13) exposed towards the collecting space outlet (11). [5] Gearbox housing (1) according to at least one of the preceding claims, characterized by that the collecting space (9) has a half-shell-like volume. [6] Gearbox housing (1) according to at least one of the preceding claims, characterized by that the throttle channel outlet (16) opens into the collecting chamber (9) below the vent channel inlet (12). [7] Gearbox housing (1) according to at least one of the preceding claims, characterized bythat the collecting space (9) has a bottom section and a back section and the throttle channel outlet (16) opens into the collecting space (9) at the bottom section and / or at the back section. [8] Gearbox housing (1) according to at least one of the preceding claims, characterized by that the throttle channel inlet is arranged below the throttle channel outlet (16). [9] Gearbox housing (1) according to at least one of the preceding claims, characterized by that the throttle channel inlet has a peripheral edge exposed towards the interior (2) and / or the throttle channel outlet (16) has a peripheral edge exposed towards the collecting space (9). [10] Gearbox housing (1) according to at least one of the preceding claims, characterized by that the gear housing (1) has a housing wall (4) and the collecting space (9) is formed in the housing wall (4). [11] Gearbox housing (1) according to at least one of the preceding claims, characterized by that the gear housing (1) has an intermediate wall (5) and the collecting space (9) is formed in the intermediate wall (5). [12] Motor vehicle transmissions with moving transmission components, characterized by that the motor vehicle transmission has a transmission housing (1) according to at least one of the preceding claims.

Images