Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Carrier braked
Patent
1999-03-18
2000-07-18
Marmor, Charles A.
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
Carrier braked
180372, 1922211, 74391, 188 715, 188264AA, B60K 1704, F16H 5710, B60T 106
Patent
active
060900067
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a planetary transmission for a vehicle, comprising a planet carrier, on which at least one planet wheel is mounted, a hub arranged for a vehicle wheel and connected to the planet carrier, a static housing which is connected to the vehicle and in which the hub is mounted, and a friction brake arranged at an outer periphery of the planet carrier and intended to brake the rotation of the planet carrier in relation to the static housing.
BACKGROUND OF THE INVENTION
It is previously known to arrange a planetary transmission in conjunction with the wheel of a vehicle. The drive shaft of the vehicle is then provided with an inner sun wheel for the planetary transmission, and a static housing surrounding the planetary transmission is provided with an outer gear ring. The sun wheel and the gear ring interact with planet wheels which are arranged on a planet carrier. The planet carrier is connected to a hub which is mounted in the static housing, and a vehicle wheel can be mounted on the hub by means of wheel bolts. By arranging a planetary transmission in conjunction with the wheel of a vehicle, an increase in torque from the drive shaft to the wheel is obtained. In order to brake the vehicle, friction discs are arranged on the periphery of the planet carrier, which interact with disc plates which are arranged in the static housing.
The construction of the known planetary transmission is such that it is not suitable for large and heavy vehicles, such as industrial machinery, which would require, for example, a stronger hub bearing arrangement and thus a longer hub in the axial direction. This would, however, place greater demands on the connection between the planet carrier and the hub, at the same time as it is desirable to keep the planetary transmission as a whole as compact as possible.
SUMMARY OF THE INVENTION
The object of the present invention is to produce a planetary transmission of the type indicated in the introduction, which eliminates the problems indicated above and aims to obtain as compact a construction as possible.
A further object of the invention is to produce a planetary transmission which comprises relatively few components and is easy and inexpensive to manufacture.
According to the invention, this is achieved by virtue of the fact that the hub and the planet carrier are interconnected by means of a first splined connection.
According to the invention, this is also achieved by virtue of the fact that an outer gear ring is arranged so as to interact with the at least one planet wheel and that the outer gear ring is connected to the static housing by means of a second splined connection.
Such a planetary transmission is compact and comprises fewer components than the known planetary transmission in spite of the fact that the planetary transmission is dimensioned so as to absorb considerably greater forces than the known construction.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail below with reference to the appended drawing which shows two exemplary embodiments and in which:
FIG. 1 shows a sectional side view of a planetary transmission according to a first exemplary embodiment of the present invention, and
FIG. 2 shows a sectional side view of a planetary transmission according to a second exemplary embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1, reference number 1 designates a planetary transmission for a vehicle, which planetary transmission 1 comprises a planet carrier 2, on which a number of planet wheels 4 are arranged. From the engine or gearbox (not shown) of the vehicle, a drive shaft 6 extends, the outer end 8 of which comprises an inner sun wheel 10 for the planetary transmission 1, which inner sun wheel 10 is intended to interact with the planet wheels 4 on the planet carrier 2. The number of planet wheels 4 according to the first exemplary embodiment in FIG. 1 is three, but it is also possible for the number of planet wheels 4 to be two,
REFERENCES:
patent: 2998735 (1961-09-01), Elfes
patent: 3092370 (1963-06-01), Kennedy
patent: 3115204 (1963-12-01), Dence
patent: 3957146 (1976-05-01), Le Blanc
patent: 4646880 (1987-03-01), Lohsn
patent: 5147255 (1992-09-01), Strehler et al.
patent: 5842947 (1998-12-01), Weilant
Marmor Charles A.
Parekh Ankur
Volvo Construction Equipment Components AB
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