TRACK BELT TENSION ADJUSTING DEVICE

WIPO Patent Application WO/2014/073519

A1

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).

WO/1994/022707	HYDRAULIC TRACK TENSIONER FOR TENSIONING TRACKS OF TRACKED GEARS
JPS526869	FLUID PRESSURE TENSION ADJUSTING DEVICE FOR A BELT*CHAIN*ETC*
JP2007245777	FRAME STRUCTURE OF WORKING VEHICLE

OHAMA HIROFUMI (JP)
GOKITA OSAMU (JP)
SEKIGUCHI YOSHIAKI (JP)

PCT/JP2013/079856

May 15, 2014

November 05, 2013

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HITACHI CONSTRUCTION MACHINERY (JP)

B62D55/30; F16N21/02

JP2012148592A	2012-08-09
JPS60263B2	1985-01-07
JPS5237221A	1977-03-23
JPS6215597Y2	1987-04-20

HIROSE KAZUHIKO (JP)
Kazuhiko Hirose (JP)

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