A lubricant guide shell (32) for includes a first, radially extending section (33), which is provided for being situated axially opposite an end face (35) of a torque converter (9) in an installed state of the lubricant guide shell (32). The first section (33) transitions radially outwardly into a second, axially extending section (34), which, in the installed state of the lubricant guide shell (32), is configured for axially at least partially and radially outwardly encompassing the torque converter starting from the first section (33). The first section (33) as well as the second section (34) are configured to be completely circumferential.

In order to enable efficient operation and reliable heat dissipation in a transmission, a pumping device (10) for lowering the internal pressure in a transmission (100) is equipped with a suction line (18), which leads from a suction point (20) on a connection side (14) to a discharge point (22) on a discharge side (16), a pump (24) for generating negative pressure at the suction point (20), a pump drive (26) for driving the pump (24), and an oil separator (28) connected upstream or downstream of the pump (24) in the suction line (18) that separates oil contained in the suction flow and returns it via a return line (30) to the connection side (14), and a check valve (34) connected downstream, preferably directly downstream, of the pump (24). A transmission (100) with such a pumping device (10), a use of a pumping device (10) and a method for reducing power losses in a transmission (100) are disclosed.

An intermediate wall is provided with a return oil hole through which oil discharged from a friction engagement device returns toward an oil reservoir. A chain drive is disposed adjacent to the intermediate wall. The chain drive transmits a driving force from an input member and/or a rotary electric machine to an oil pump. There is provided an oil guide through which oil flowing through the return oil hole is guided to a region other than a chain placement region inside a case. The chain placement region is a region where a chain of the chain drive is placed.

An intermediate wall is provided with a return oil hole through which oil discharged from a friction engagement device returns toward an oil reservoir. A chain drive is disposed adjacent to the intermediate wall. The chain drive transmits a driving force from an input member and/or a rotary electric machine to an oil pump. There is provided an oil guide through which oil flowing through the return oil hole is guided to a region other than a chain placement region inside a case. The chain placement region is a region where a chain of the chain drive is placed.

An oil management system for a vehicle includes a differential housing, a transmission housing, a lubricant tank, a suction line, a lubricant pump, and an air suction pump. The transmission housing is connected to the differential housing in an air-tight manner, and a lubricant through-passage is defined between the transmission housing and the differential housing. The lubricant tank is provided in the differential housing and has a lubricant suction opening in a lower region. The lubricant pump conveys lubricant from the lubricant tank through the suction line and conducts the lubricant to the lubrication points in the differential housing and the transmission housing. The air suction pump pumps air from the lubricant tank into the transmission housing so that an excess air pressure is maintained in the transmission housing.

A lubricant guide shell (32) for includes a first, radially extending section (33), which is provided for being situated axially opposite an end face (35) of a torque converter (9) in an installed state of the lubricant guide shell (32). The first section (33) transitions radially outwardly into a second, axially extending section (34), which, in the installed state of the lubricant guide shell (32), is configured for axially at least partially and radially outwardly encompassing the torque converter starting from the first section (33). The first section (33) as well as the second section (34) are configured to be completely circumferential.

An oil management system for a vehicle includes a differential housing, a transmission housing, a lubricant tank, a suction line, a lubricant pump, and an air suction pump. The transmission housing is connected to the differential housing in an air-tight manner, and a lubricant through-passage is defined between the transmission housing and the differential housing. The lubricant tank is provided in the differential housing and has a lubricant suction opening in a lower region. The lubricant pump conveys lubricant from the lubricant tank through the suction line and conducts the lubricant to the lubrication points in the differential housing and the transmission housing. The air suction pump pumps air from the lubricant tank into the transmission housing so that an excess air pressure is maintained in the transmission housing.

A spur gear transmission has at least two toothed spur gears with toothings that are in meshing engagement with one another and which are each rotatable about an axis of rotation. An enveloping wall at least partially encloses the two spur gears in a circumferential direction and in the direction of the axis of rotation. The enveloping wall has an inner contour adapted to the outer diameters of the spur gears such that, between the enveloping wall and the spur gears, there are formed two ring-shaped gaps which transition into one another, wherein in each case one ring-shaped gap is arranged concentrically with in each case one axis of rotation. A lubricating device conducts a lubricant flow into the toothings of the spur gears. A cooling device is additionally provided, which conducts a coolant flow through one or more cooling ducts within and/or along the outside of the enveloping wall.

A transmission for a commercial vehicle that has a transmission housing in which at least one venting arrangement, for equalizing the pressure between an inside space of the transmission housing and the surroundings of the transmission housing, is provided. The arrangement includes a vent fixed on a wall of the transmission housing on the surroundings side. The vent is connected by way of an oil foam reducing venting channel to at least one inside space of the transmission housing. At least a first venting bore, on the inside space side, and a second venting bore, on the vent side, are provided as the venting channel such that, in relation to their cross-sections, the venting bores are offset relative to one another, at their connection area, in such manner that a step-shaped transition is formed in the connection area between the venting bores.

In order to enable efficient operation and reliable heat dissipation in a transmission, a pumping device (10) for lowering the internal pressure in a transmission (100) is equipped with a suction line (18), which leads from a suction point (20) on a connection side (14) to a discharge point (22) on a discharge side (16), a pump (24) for generating negative pressure at the suction point (20), a pump drive (26) for driving the pump (24), and an oil separator (28) connected upstream or downstream of the pump (24) in the suction line (18) that separates oil contained in the suction flow and returns it via a return line (30) to the connection side (14), and a check valve (34) connected downstream, preferably directly downstream, of the pump (24).

A transmission (100) with such a pumping device (10), a use of a pumping device (10) and a method for reducing power losses in a transmission (100) are disclosed.