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Patent Searching and Data


Title:
TRACK BELT TENSION ADJUSTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/073519
Kind Code:
A1
Abstract:
A grease passage (29) having a valve seat (29C) is provided in a frame-side rod (24). A valve mounting hole (30) is provided between the valve seat (29C) of the grease passage (29) and an opening end (30B) provided to the frame-side rod (24). The valve mounting hole (30) has a female thread hole (30A) provided on the valve seat (29C) side thereof, and also has a circular cylindrical hole (30C) provided on the opening end (30B) side thereof. A grease supply valve (31) is provided with a valve section (32G) which is seated on the valve seat (29C), a male thread (35) which engages with the female thread hole (30A), and an annular groove (38). A seal ring (39) is mounted in the annular groove (38). The distance (B) from the opening end (30B) of the valve mounting hole (30) to the intermediate position (39A) of the seal ring (39) in the axial direction is set in such a manner that, with the valve section (32G) of the grease supply valve (31) seated on the valve seat (29C), the distance (B) is less than the pitch (A) of the male thread (35).

Inventors:
OHAMA Hirofumi (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
GOKITA Osamu (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
SEKIGUCHI Yoshiaki (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2013/079856
Publication Date:
May 15, 2014
Filing Date:
November 05, 2013
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (5-1 Koraku 2-chome, Bunkyo-ku Tokyo, 63, 〒1128563, JP)
International Classes:
B62D55/30; F16N21/02
Foreign References:
JP2012148592A2012-08-09
JPS60263B21985-01-07
JPS5237221A1977-03-23
JPS6215597Y21987-04-20
Attorney, Agent or Firm:
HIROSE Kazuhiko (4F. HAP Nishishinjuku Bldg, 1-2 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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