Pump apparatus

Abstract

A pump apparatus includes: a housing; a pump unit; a suction passage; a discharge passage member including a discharge hydraulic passage which is formed therein, and which is arranged to discharge the hydraulic fluid pressurized by the pump unit to an outside of the housing; a first discharge passage insertion hole which is formed in the pump unit, and into which the discharge passage member is inserted through an elastic member; a second discharge passage insertion hole which is formed in the housing, and into which the discharge passage member is inserted through an elastic member; and an axial position adjusting mechanism arranged to adjust an axial position of the discharge passage member within the first discharge passage insertion hole and the second discharge passage insertion hole.

What is claimed is: 
     
         1 . A pump apparatus comprising:
 a housing;   a pump unit received within a receiving portion which is formed in the housing, and which constitutes a low pressure chamber;   a suction passage which is opened in an outer circumference of the pump unit, and which is arranged to supply a hydraulic fluid into the pump unit;   a discharge passage member including a discharge hydraulic passage which is formed therein, and which is arranged to discharge the hydraulic fluid pressurized by the pump unit to an outside of the housing;   a first discharge passage insertion hole which is formed in the pump unit, and into which the discharge passage member is inserted through an elastic member;   a second discharge passage insertion hole which is formed in the housing, and into which the discharge passage member is inserted through an elastic member; and   an axial position adjusting mechanism arranged to adjust an axial position of the discharge passage member within the first discharge passage insertion hole and the second discharge passage insertion hole.   
     
     
         2 . The pump apparatus as claimed in  claim 1 , wherein the axial position adjusting mechanism is an elastic member arranged to apply an elastic force to the discharge passage member. 
     
     
         3 . The pump apparatus as claimed in  claim 2 , wherein the first discharge passage insertion hole and the discharge passage member are disposed with a gap therebetween; the second discharge passage insertion hole and the discharge passage member are disposed with a gap therebetween; and the pump apparatus further comprises a radial position adjusting mechanism arranged to adjust a position relationship between each of the first discharge passage insertion hole and the second discharge passage insertion hole, and the discharge passage member. 
     
     
         4 . The pump apparatus as claimed in  claim 1 , wherein the pump apparatus further comprises a closing member which is fixed to the housing, and which closes the second discharge passage insertion hole; and the axial position adjusting mechanism is disposed between the discharge passage member and the closing member. 
     
     
         5 . The pump apparatus as claimed in  claim 4 , wherein the pump apparatus further comprises a damper chamber formed by the closing member, the discharge passage member, and a wall surface of the second passage member insertion hole. 
     
     
         6 . The pump apparatus as claimed in  claim 4 , wherein the axial position adjusting mechanism includes a plunger member arranged to be moved in an axial direction relative to one of the discharge passage member and the closing member; and the axial position adjusting mechanism is arranged to adjust a relative position between the plunger member, and the one of the discharge passage member and the closing member. 
     
     
         7 . The pump apparatus as claimed in  claim 4 , wherein the axial position adjusting mechanism is a plate spring disposed in a contracted state between the discharge passage member and the closing member. 
     
     
         8 . The pump apparatus as claimed in  claim 4 , wherein the axial position adjusting mechanism is a coil spring disposed in a contracted state between the discharge passage member and the closing member. 
     
     
         9 . The pump apparatus as claimed in  claim 1 , wherein the pump apparatus further comprises an engagement portion which is formed in the first discharge passage insertion hole, and with which the discharge passage member is engaged; and the axial position adjusting mechanism is an elastic member arranged to urge the discharge passage member toward the engagement portion. 
     
     
         10 . A pump apparatus comprising:
 a housing;   a pump unit received within a receiving portion which is formed in the housing, and which constitutes a low pressure chamber;   a discharge passage which is arranged to discharge a hydraulic fluid pressurized by the pump unit, through the housing to an outside of the housing;   a discharge passage member which constitutes the discharge passage, and which includes a discharge hydraulic passage formed therein;   a first discharge passage insertion hole which is formed in the pump unit, and into which an one end portion of the discharge passage member is inserted through an elastic member;   a second discharge passage insertion hole which is formed in the housing, and into which the other end portion of the discharge passage member is inserted through an elastic member;   an axial position adjusting mechanism arranged to adjust an axial position of the discharge passage member with respect to the first discharge passage insertion hole and the second discharge passage insertion hole; and   the first discharge passage insertion hole and the discharge passage member being disposed with a predetermined radial gap therebetween,   the second discharge passage insertion hole and the discharge passage member being disposed with a predetermined radial gap therebetween,   a radial position adjusting mechanism arranged to adjust a radial position relationship between the each of the first discharge passage insertion hole and the second discharge passage insertion hole, and the discharge passage member.   
     
     
         11 . The pump apparatus as claimed in  claim 10 , wherein the axial position adjusting mechanism is an elastic member arranged to apply an elastic force to the discharge passage member. 
     
     
         12 . The pump apparatus as claimed in  claim 11 , wherein the radial position adjusting mechanism is an O-ring mounted on an outer circumference of the discharge passage member; and the radial position adjusting mechanism is arranged to adjust a size of the radial gap by an elastic deformation of the O-ring. 
     
     
         13 . The pump apparatus as claimed in  claim 12 , wherein the pump apparatus further comprises a closing member which is fixed to the housing, and which closes the second discharge passage insertion hole; and the axial position adjusting mechanism is disposed between the discharge passage member and the closing member. 
     
     
         14 . The pump apparatus as claimed in  claim 13 , wherein the axial position adjusting mechanism is a plate spring disposed in a contracted state between the discharge passage member and the closing member. 
     
     
         15 . The pump apparatus as claimed in  claim 13 , wherein the pump apparatus further comprises a damper chamber formed by the closing member, the discharge passage member, and a wall surface of the second passage member insertion hole. 
     
     
         16 . A pump apparatus comprising:
 a housing;   a pump unit which is received in a receiving portion formed in the housing, and which includes a low pressure portion and a high pressure portion formed therein;   a suction passage formed in the housing, and arranged to supply a hydraulic fluid to the low pressure portion of the pump unit;   a low pressure chamber connected with the suction passage and the low pressure portion, and formed between the pump unit and a wall portion forming the receiving portion when the pump unit is received in the receiving portion; a discharge passage arranged to discharge the hydraulic fluid pressurized by the pump unit;   a connection pipe which constitutes the discharge passage, and which passes through the low pressure chamber, and which connects the housing and the high pressure chamber,   a first connection pipe insertion hole which is formed in the pump unit, and into which the connection pipe is inserted through an elastic member;   a second connection pipe insertion hole which is formed in the housing, and into which the connection pipe is inserted through the elastic member;   an axial position adjusting mechanism arranged to adjust an axial position of the connection pipe with respect to the first connection pipe insertion hole and the second connection pipe insertion hole; and   the first connection pipe insertion hole and the connection pipe being disposed with a predetermined radial gap therebetween,   the second connection pipe insertion hole and the connection pipe being disposed with a predetermined radial gap therebetween,   a radial position adjusting mechanism arranged to adjust a radial position relationship between each of the first connection pipe insertion hole and the second connection pipe insertion hole, and the connection pipe.   
     
     
         17 . The pump apparatus as claimed in  claim 16 , wherein the axial position adjusting mechanism is an elastic member arranged to apply an elastic force to the connection pipe. 
     
     
         18 . The pump apparatus as claimed in  claim 16 , wherein the radial position adjusting mechanism is an O-ring which is mounted on an outer circumference of the discharge passage member; and the radial position adjusting mechanism is arranged to adjust a size of the radial gap by an elastic deformation of the O-ring. 
     
     
         19 . The pump apparatus as claimed in  claim 16 , wherein the pump apparatus further comprises a closing member which is fixed to the housing, and which closes the second connection pipe insertion hole; the axial position adjusting mechanism is disposed between the connection pipe and the closing member; and the pump apparatus further comprises a damper chamber formed by the closing member, the connection pipe, and a wall surface of the second connection pipe insertion hole.