Vacuum pump and vacuum system including the same

Abstract

A vacuum pump and a vacuum system can be stopped when necessary when an engine is operating.

1 . A vacuum pump for supplying vacuum pressure, comprising
 a pump main body configured for generating the vacuum pressure therein, and   a power transmitting portion transmitting a power to the pump main body,   wherein the power transmitting portion comprises:   a case forming a receiving part therein and forming a first gear in an interior circumference;   a ring assembly located in the case such that the ring assembly selectively transmits the power to the first gear, the ring assembly including a ring shaped outer-geared ring forming a second gear at an exterior circumference of the outer-geared ring to be geared to the first gear and a ring shaped inner-geared ring forming a third gear at an inner circumference of the inner-geared ring;   a gear shaft comprising a fourth gear formed to transmit the power to the third gear and located penetrating the ring assembly; and   a supporting member located between one side of the case and one side of the ring assembly to support the ring assembly.   
   
   
       2 . The pump of  claim 1 , wherein an oil supplying hole is formed in the case such that fluid can inflow between the ring assembly and the case, which confront each other. 
   
   
       3 . The pump of  claim 2 , wherein the ring assembly comprises:
 at least a pair of outer-geared rings located at both ends of the mounting portion; and   an inner-geared ring between the outer-geared rings.   
   
   
       4 . The pump of  claim 3 , wherein:
 the inner-geared ring comprises a plurality of rings; and   outer-geared rings are located between the plurality of inner-geared rings.   
   
   
       5 . The pump of  claim 2 , wherein the ring assembly comprises:
 at least a pair of inner-geared rings located at both ends of the mounting portion; and   an outer-geared ring located between the inner-geared rings.   
   
   
       6 . The pump of  claim 5 , wherein:
 the outer-geared ring comprises a plurality of rings; and   inner-geared rings are located between the plurality of outer-geared rings.   
   
   
       7 . A vacuum system generating and supplying a vacuum pressure, comprising:
 a vacuum tank storing the vacuum pressure;   an oil pump supplying an oil to generate the vacuum pressure;   a vacuum pump operating to make the vacuum tank to be in a vacuum state;   a solenoid valve located on a hydraulic line between the vacuum pump and the oil pump such that fluid is selectively supplied to the vacuum pump; and   an electronic control unit (ECU) controlling the solenoid valve on the basis of information of a vacuum state of the vacuum tank,   wherein the vacuum pump supplying the vacuum pressure comprises:   a pump main body generating the vacuum pressure; and   a power transmitting portion transmitting a power to the pump main body,   wherein the power transmitting portion comprises:   a case forming a receiving part therein, forming a first gear at an interior circumference, and comprising an oil supplying hole formed such that the fluid inflows into the case;   a ring assembly located in the case such that the ring assembly selectively transmits the power to the first gear, the ring assembly comprising a ring shaped outer-geared ring forming a second gear at an exterior circumference of the outer-geared ring to be geared to the first gear and a ring shaped inner-geared ring forming a third gear at an inner circumference of the inner-geared ring;   a gear shaft comprising a fourth gear formed to transmit the power to the third gear and located penetrating the ring assembly; and   a supporting member located between one side of the case and one side of the ring assembly to support the ring assembly.   
   
   
       8 . The system of  claim 7 , wherein the ring assembly comprises:
 at least a pair of outer-geared rings located at both ends of the mounting portion; and   an inner-geared ring between the outer-geared rings.   
   
   
       9 . The system of  claim 8 , wherein:
 the inner-geared ring comprises a plurality of rings; and   outer-geared rings are located between the plurality of inner-geared rings.   
   
   
       10 . The system of  claim 7 , wherein the ring assembly comprises:
 at least a pair of inner-geared rings located at both ends of the mounting portion; and   an outer-geared ring located between the inner-geared rings.   
   
   
       11 . The system of  claim 10 , wherein:
 the outer-geared ring comprises a plurality of rings; and   inner-geared rings are located between the plurality of outer-geared rings.