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US 2006/0037469 A1Published application
Vacuum booster
AssigneeAisin Seiki Kaubushi Kaisha
InventorsAkihiko Miwa, Kaoru Tsubouchi, Nobuyuki Hirota, Tomoyasu Sakai
Life of this patent
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Abstract
A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.
Claims16
A vacuum booster comprising:
- a housing having a pressure chamber therein;
- a movable wall provided in the housing for being movable forward and backward and for separating the pressure chamber into a constant pressure chamber and a variable pressure chamber;
- a power piston having a first vacuum valve seat and a radial directional bore and unitarily formed with the movable wall;
- an input rod provided in the power piston for being movable forward and backward relative to the power piston;
- a plunger having a first flange portion and a second flange portion, connected to the input rod, inserted into the power piston slidably in a longitudinal direction relative to the power piston, and formed with an atmosphere valve seat;
- an output member for outputting a driving force of the power piston outside of the vacuum booster in accordance with a movement of the movable wall;
- a valve seat member having a second vacuum valve seat and being approximately concentric with the first vacuum valve seat and being movable forward and backward relative to the power piston;
- a valve mechanism provided in the power piston and having a movable portion facing the first vacuum valve seat and a fixing portion provided concentric with the movable portion;
- drive means for moving the valve seat member towards the movable portion by a predetermined amount when a forward moving amount of the plunger relative to the power piston is equal to or greater than a predetermined value;
- holding means for holding the valve seat member at a predetermined position in the power piston when the forward moving amount of the plunger relative to the power piston is less than the predetermined value;
- an engaging member for engaging the holding means with the power piston;
- a key member inserted into the radial directional bore and moving between the first flange portion and the second flange portion of the plunger in the longitudinal direction for restricting a longitudinal direction moving amount of the plunger relative to the power piston;
- noise restriction means mounted on the plunger for restricting a contact noise between the key member and the second flange portion of the plunger
10 more elements
A vacuum booster comprising:
- a housing having a pressure chamber therein;
- a movable wall provided in the housing for being movable forward and backward and for separating the pressure chamber into a constant pressure chamber and a variable pressure chamber;
- a power piston having a first vacuum valve seat and a radial directional bore and unitarily formed with the movable wall;
- an input rod provided in the power piston for being movable forward and backward relative to the power piston;
- a plunger having a first flange portion and a second flange portion, connected to the input rod, inserted into the power piston slidably in a longitudinal direction relative to the power piston, and formed with an atmosphere valve seat;
- an output member for outputting a driving force of the power piston outside of the vacuum booster in accordance with a movement of the movable wall;
- a valve seat member having a second vacuum valve seat and being approximately concentric with the first vacuum valve seat and being movable forward and backward relative to the power piston;
- a valve mechanism provided in the power piston and having a movable portion facing the first vacuum valve seat and a fixing portion provided concentric with the movable portion;
- a drive means for moving the valve seat member towards the movable portion by a predetermined amount when a forward moving amount of the plunger relative to the power piston is equal to or greater than a predetermined value;
- a holding means for holding the valve seat member at a predetermined position in the power piston when the forward moving amount of the plunger relative to the power piston is less than the predetermined value;
- an engaging member for engaging the holding means with the power piston;
- a key member inserted into the radial directional bore and moving between the first flange portion and the second flange portion of the plunger in the longitudinal direction for restricting a longitudinal direction moving amount of the plunger relative to the power piston;
- and
- noise restriction means for restricting a contact noise between the key member and the second flange portion of the plunger, the noise restriction means contacting the valve seat member during backward movement of the valve seat member.
11 more elements
Dependencies are inferred from the claim text.