Turbocharger with a waste gate valve

Abstract

A turbocharger includes a waste gate valve, a compressor with a turbine, a turbine housing which houses the turbine, a bypass channel with an opening cross-section, a bypass channel portion formed in the turbine housing, an actuator housing with a separate coolant channel, an electric motor arranged in the actuator housing, a transmission with an output shaft, the transmission being arranged in the actuator housing and being provided as a worm wheel gear unit, and a control body coupled to the output shaft of the transmission. The bypass channel bypasses the turbine. The actuator housing is removably secured to the turbine housing. The control body controls the opening cross-section of the bypass channel.

What is claimed is: 
     
       1. A turbocharger comprising:
 a waste gate valve; 
 a compressor; 
 a turbine; 
 a turbine housing configured to house the turbine; 
 a bypass channel comprising an opening cross-section, the bypass channel being configured to bypass the turbine; 
 a bypass channel portion formed in the turbine housing; 
 an actuator housing comprising a separate coolant channel, the actuator housing being removably secured to the turbine housing; 
 an electric motor arranged in the actuator housing; 
 a transmission comprising an output shaft, the transmission being arranged in the actuator housing and being provided as a worm wheel gear unit; and 
 a control body coupled to the output shaft of the transmission, the control body being configured to control the opening cross-section of the bypass channel. 
 
     
     
       2. The turbocharger as recited in  claim 1 , wherein the electric motor comprises an input shaft which comprises a center axis which extends substantially vertically with respect to the output shaft of the transmission. 
     
     
       3. The turbocharger as recited in  claim 2 , further comprising:
 a first coolant channel section configured to circumferentially surround the transmission; and 
 an actuator cover configured to axially close the first coolant channel section. 
 
     
     
       4. The turbocharger as recited in  claim 3 , further comprising:
 a second coolant channel section configured to radially enclose the electric motor at least in part over an entire axial height; and 
 a motor cover configured to close the second coolant channel section. 
 
     
     
       5. The turbocharger as recited in  claim 4 , further comprising two passage openings configured to connect the first coolant channel section and the second coolant channel section with each other. 
     
     
       6. The turbocharger as recited in  claim 5 , further comprising a first partition wall formed in the first coolant channel section between the two passage openings to the second coolant channel section. 
     
     
       7. The turbocharger as recited in  claim 6 , wherein,
 the electric motor comprises a receiving portion, and 
 further comprising a coolant inlet port and a coolant outlet port formed on the actuator housing in the receiving portion of the electric motor. 
 
     
     
       8. The turbocharger as recited in  claim 7 , further comprising a second partition wall arranged in the second coolant channel section between the coolant inlet port and the coolant outlet port, the partition wall being configured to extend in an axial direction of the input shaft of the electric motor. 
     
     
       9. The turbocharger as recited in  claim 3 , wherein the waste gate valve comprises electronic components which are arranged on the actuator cover. 
     
     
       10. The turbocharger as recited in  claim 9 , further comprising:
 a magnet connected with the output shaft of the transmission, 
 wherein, the electronic components include a connector and a contactless sensor which are configured to provide a position feedback, the sensor being configured to communicate with the magnet. 
 
     
     
       11. The turbocharger as recited in  claim 3 , further comprising terminals for the electric motor formed on the actuator cover.