Title:
FLUID CONTROL VALVE
Document Type and Number:
Japanese Patent JP2014169668
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To solve a problem that, since a conventional EGR control valve employs an expensive PTFE seal as condensed-water intrusion prevention means for a bearing, the number of part items and man-hours become large, thus causing a cost increase.SOLUTION: An EGR control valve has at least one or more radial holes 71 for leveling a pressure difference between an A-point and a B-point around an output shaft 5 at a first protrusive shaft part 41 of the output shaft 5 which forms a clearance part 62 between a throttle wall 65 of a hosing 4 and itself, or at a large-diameter shaft part 43. By this constitution, the pressure difference in a shaft circumferential direction at the clearance part 62 formed between an internal peripheral of the throttle wall 65 of the housing 4 and an external periphery of the first protrusive shaft part 41 of the output shaft 5 is eliminated. As a result, even if the expensive PTFE seal is abolished, condensed water does not intruded into a bearing hole 61 from passage holes 22, 23 of the housing 4.
Inventors:
KOBAYASHI TAKASHI
SUNAMI KAZUO
SAITO TORU
SUNAMI KAZUO
SAITO TORU
Application Number:
JP2013042516A
Publication Date:
September 18, 2014
Filing Date:
March 05, 2013
Export Citation:
Assignee:
DENSO CORP
NIPPON SOKEN
NIPPON SOKEN
International Classes:
F02M25/07; F16K31/04; F16K41/04
Domestic Patent References:
| JP2010065729A | 2010-03-25 | |||
| JP2009299879A | 2009-12-24 | |||
| JP2012041827A | 2012-03-01 | |||
| JP2005282520A | 2005-10-13 | |||
| JPH11190458A | 1999-07-13 |
Attorney, Agent or Firm:
Kenji Ishiguro
Shinji Nagatani
Shinji Nagatani