Title:
VARIABLE-LOAD VALVE AND BRAKE CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/014416
Kind Code:
A1
Abstract:
The disclosed variable-load valve (21) is provided with a first diaphragm member (41), a second diaphragm member (42), a piston (40), a force-transmission member (43), and a diaphragm-affixing member (45). The first diaphragm member (41) deflects due to the pressure inside a pilot chamber into which air is introduced at a pressure corresponding to a vehicle weight. The second diaphragm member (42) deflects due to the pressure inside an output chamber for outputting a load-compensating pressure. The piston (40) generates the load-compensating pressure by moving axially in accordance with the deflection of the first and second diaphragm members (41 and 42). The force-transmission member (43) comprises: a pressure-receiving part (43b) which has a pressure-receiving surface (43d) that is subjected to a pressing force due to the deflection of the second diaphragm member (42); and an extension part (43c) which extends radially from a fixed part (43a). The force-transmission member transmits, to the piston (40), a force in accordance with the pressing force that the pressure-receiving surface (43d) is subjected to from the second diaphragm member (42). The diaphragm-affixing member (45) is formed separately from a block (25), affixes the periphery of the second diaphragm member (42) to said block (25), and sets the surface area of the pressure-receiving surface (43d) of the force-transmission member (43).
Inventors:
YAMANAKA, Masatami (3-3 Takatsukadai 7-chome, Nishi-ku, Kobe-sh, Hyogo 71, 〒6512271, JP)
Application Number:
JP2011/004132
Publication Date:
February 02, 2012
Filing Date:
July 22, 2011
Export Citation:
Assignee:
NABTESCO CORPORATION (7-9 Hirakawacho 2-chome, Chiyoda-ku Tokyo, 93, 〒1020093, JP)
ナブテスコ株式会社 (〒93 東京都千代田区平河町ニ丁目７番９号 Tokyo, 〒1020093, JP)
ナブテスコ株式会社 (〒93 東京都千代田区平河町ニ丁目７番９号 Tokyo, 〒1020093, JP)
International Classes:
B60T15/18; B60T8/22
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (Osaka Nakanoshima Building 2nd Floor, 2-2 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 〒5300005, JP)
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Claims: