Turbocharger with cooled turbine housing, cooled bearing housing, and a common coolant supply
A turbocharger has a turbine housing and a bearing housing that is connected to the turbine housing. Coolant is supplied to the bearing housing via the turbine housing.
1. An exhaust-gas turbocharger, comprising:
a turbine housing formed with a coolant inlet, a cooling jacket inside said turbine housing, and a coolant outlet;
a bearing housing connected to said turbine housing, said bearing housing having a coolant inlet, a cooling jacket inside said bearing housing, and a coolant outlet;
a coolant inlet duct formed inside said turbine housing between said coolant inlet and said cooling jacket in said turbine housing;
a coolant branch duct branching off from said coolant inlet duct and connected to said coolant inlet of said bearing housing, said coolant branch duct formed inside said turbine housing;
a coolant outlet duct formed inside said turbine housing between said cooling jacket and said coolant outlet in said turbine housing;
a coolant return duct formed inside said turbine housing and connected to said coolant outlet of said bearing housing; and
said coolant return duct issuing into said coolant outlet duct formed inside said turbine housing between said cooling jacket and said coolant outlet thereof.
2. The exhaust-gas turbocharger according to claim 1 , wherein said coolant outlet of said bearing housing is connected via a bearing-housing-side coolant outlet duct to said cooling jacket of said bearing housing.
3. The exhaust-gas turbocharger according to claim 1 , wherein said bearing housing is formed with a bearing-housing-side coolant inlet duct connecting said coolant inlet of said bearing housing to said cooling jacket of said bearing housing.
4. The exhaust-gas turbocharger according to claim 3 , wherein a cross-section (i.e., diameter d1) of said bearing-housing-side coolant inlet duct is greater than a cross-section (i.e., diameter d2) of said turbine-housing-side coolant branch duct.
5. The exhaust-gas turbocharger according to claim 1 , which comprises a seal disposed between said bearing housing and said turbine housing in a vicinity of said coolant inlet of said bearing housing.
6. The exhaust-gas turbocharger according to claim 5 , wherein said seal is a sealing ring or a bead-type seal.
7. The exhaust-gas turbocharger according to claim 5 , which comprises a further seal disposed between said bearing housing and said turbine housing in a vicinity of said coolant outlet of said bearing housing.
8. The exhaust-gas turbocharger according to claim 7 , wherein said seal and said further seal are seals selected from the group consisting of a sealing ring and a bead-type seal.