Pump with radial packing ring
A pump, preferably a vane cell pump for supplying a transmission with oil, includes a pump housing and a rotating group which is disposed inside the pump housing. The rotating group includes a side plate that may be mounted inside the pump housing in such a manner as to produce, at least temporarily, an axial gap between the side plate and the pump housing. A shaft is mounted inside the pump housing and a radial packing ring is located in a recess around the shaft. The packing ring seals off the rotating group towards the exterior radially on the pump housing and radially on the shaft using a sealing lip.
1. A pump for supplying transmission oil comprising:
a pump housing and a side plate for a rotating group situated in the pump housing, an axial gap occurring between the side plate and the pump housing;
a shaft mounted in the pump housing; and
a radial packing ring situated in a recess around the shaft, the radial packing ring radially sealing off the rotating group with respect to a surface on the pump housing and radially sealing off the rotating group on the shaft via a first sealing lip so as to form a radial seal between the shaft and the pump housing, the radial packing ring also establishing an axial seal between the pump housing and the side plate.
2. The pump as recited in claim 1 wherein the axial seal bridges the axial gap.
3. The pump as recited in claim 2 wherein the axial seal bridges the gap, the gap being a function of component tolerances.
4. The pump as recited in claim 2 wherein the axial seal seals a leak oil pressure area from an oil suction pressure area of the pump.
5. The pump as recited in claim 1 wherein the radial packing ring includes a second sealing lip forming the axial seal.
6. The pump as recited in claim 5 wherein the radial packing ring has a radially outside seal contacting the surface of the pump housing to radially seal off the rotating group with respect to the surface of the pump housing, the radially outside seal having the second sealing lip.
7. The pump as recited in claim 5 wherein the second sealing lip is free of contact with the shaft.
8. The pump as recited in claim 1 wherein the radial packing ring includes radially outside sealing sections facing away from the interior of the pump
9. The pump as recited in claim 1 further comprising a spacer axially positioning the side plate with respect to the pump housing.
10. The pump as recited in claim 1 wherein the side plate has a side plate seal pressing elastically against the pump housing thereby enlarging or creating the axial gap during a standstill of the pump.
11. The pump as recited in claim 1 wherein the pump is a vane cell pump.