Motor vehicle with transmission and transmission fluid pump

Abstract

A motor vehicle includes a transmission and a transmission fluid pump for transport of transmission oil to and within the transmission. The transmission fluid pump has a moving element which is coupled to a summation shaft of a planetary gear train. The planetary gear train has a ring gear which is operated by a first drive, and a sun gear which is operated by a second drive. A freewheel mechanism is arranged between the sun gear or a shaft connected to the sun gear and a further element so that the second drive can be switched off, when the first drive operates at high speeds while yet maintaining proper operation of the transmission fluid pump.

Claims

1. A motor vehicle, comprising: a transmission; a transmission fluid pump for transport of transmission oil to and within the transmission, said transmission fluid pump having a moving element; a planetary gear train having a summation shaft coupled with the moving element, said planetary gear train having a first driveshaft and a second driveshaft; a first drive which is an internal combustion engine of the motor vehicle for operating the first driveshaft; a second drive which is an electric motor of the motor vehicle for operating the second driveshaft; and a freewheel mechanism arranged between the second driveshaft operated by the electric motor, and a housing of the transmission, wherein the second driveshaft is directly connected to a sun gear of the planetary gearset, and, wherein the freewheel mechanism is arranged directly without intermediate elements between the second driveshaft and the housing of the transmission.

2. The motor vehicle of claim 1, wherein the planetary gear train has planetary gears, a planet carrier rotatably supporting the planetary gears and connected to the moving element of the transmission fluid pump, a ring gear operably connected to the first driveshaft, and the sun gear operably connected to the second driveshaft.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) Other features and advantages of the present invention will be more readily apparent upon reading the following description of currently preferred exemplified embodiments of the invention with reference to the accompanying drawing, in which:

(2) FIG. 1a is a schematic illustration of relevant components of a motor vehicle, showing features of one embodiment of the present invention;

(3) FIG. 1b is a schematic illustration of relevant components of a motor vehicle, showing features of another embodiment of the present invention; and

(4) FIG. 2 is a partly sectional view of the components of FIG. 1a by way of a perspective illustration.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(5) Throughout all the figures, same or corresponding elements may generally be indicated by same reference numerals. These depicted embodiments are to be understood as illustrative of the invention and not as limiting in any way. It should also be understood that the figures are not necessarily to scale and that the embodiments are sometimes illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted.

(6) Turning now to the drawing, and in particular to FIG. 1, there is shown a schematic illustration of relevant components of a motor vehicle, showing features of the present invention. The motor vehicle has an internal combustion engine 10 and a transmission fluid pump 12 which is operated by the internal combustion engine 10 to run for example at speeds between 0 and 42000 rpm. This is implemented by coupling an output shaft 14 of the internal combustion engine 10 with an output gear 16 in mesh with a ring gear 18 of a planetary gear train. The planetary gear train has a plurality of planetary gears 20 which are rotatably mounted on a planet carrier 22, as shown in FIG. 2. The planet carrier 22 is connected to a moving element 24 of the transmission fluid pump 12.

(7) In order to keep the transmission fluid pump 12 as compact as possible, an electric motor 26 is provided to operate the moving element 24 of the transmission fluid pump 12 at a sufficient speed, when the internal combustion engine 10 operates at low speeds, e.g. in a range between the idling speed, e.g. 700 rpm, up to about 200 rpm. The electric motor 26 has an output shaft 28 which is connected to a sun gear 30 of the planetary gear train. In order to be able to shut down the electric motor 26 and to prevent the sun gear 30 to rotate, when the internal combustion engine 10 operates at high speeds, e.g. in a range above 4000 rpm (Otto engines) up to a maximum speed (cutoff speed), a freewheel mechanism 32 is arranged between the sun gear 30, i.e. the output shaft 28, and the transmission housing 34.

(8) While the invention has been illustrated and described in connection with currently preferred embodiments shown and described in detail, it is not intended to be limited to the details shown since various modifications and structural changes may be made without departing in any way from the spirit and scope of the present invention. The embodiments were chosen and described in order to explain the principles of the invention and practical application to thereby enable a person skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.