Blade apparatus and its control method in bulldozer

Earth working – Automatic power control

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

172821, 172826, E02F 376

Patent

active

057997373

ABSTRACT:
A hydraulic drive system for the pitch cylinders (4A, 4B) of a bulldozer blade apparatus can include (a) main hydraulic pumps (30A, 30B) and an assistant hydraulic pump (31) to make up the assistant hydraulic circuit, (b) variable displacement hydraulic pumps (21A, 21B), or (c) fixed displacement hydraulic pumps (30A, 30B) and a plurality of solenoid selector valves such that the pitch cylinders can be connected in series. The assistant hydraulic pump (31) is connectable to delivery lines of the main hydraulic pumps through an assistant solenoid selector valve (32) which is controlled by an external signal. The blade (10) can be formed so that a line (14) tangential to the lower edge of the curved panel of the blade is inclined rearwardly with respect to the front face (13) of the blade edge member (12). Earth-moving work can be performed by inclining the blade (10) rearwardly by an angle (.theta..sub.1) with respect to its posture in digging work, and earth-dumping work can be performed by inclining the blade (10) forwardly by an angle (.theta..sub.2) with respect to its posture in digging work. The coupling positions of the two pitch cylinders (4A4B) can be in asymmetrical relation to each other. Control signals can be provided by a blade lever (23), tilt/pitch changeover switch (24), and pitch speed changeover switch (25). The tilt/pitch changeover switch (24) and pitch speed changeover switch (25) can be replaced by pitch-dump selector switch (25A) and pitch-back selector switch (24A).

REFERENCES:
patent: 3503457 (1970-03-01), Smith et al.
patent: 3774696 (1973-11-01), Horsch
patent: 3823783 (1974-07-01), Luedtke
patent: 4086843 (1978-05-01), Lorimor
patent: 4201268 (1980-05-01), Frisbee
patent: 4562891 (1986-01-01), Ranner
patent: 4664203 (1987-05-01), Williams
patent: 4848483 (1989-07-01), Heiple
patent: 5010961 (1991-04-01), Frisbee
patent: 5462125 (1995-10-01), Stratton et al.
patent: 5467829 (1995-11-01), Barton et al.
patent: 5473541 (1995-12-01), Ishino et al.
patent: 5620053 (1997-04-01), Kamikawa et al.
Akio Terai, Herb Aoki, and R.H. Stanage, "New Design concept for Komatsu D455A Bulldozer and the Actual Results", SAE Paper No. 790902, (no date).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Blade apparatus and its control method in bulldozer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Blade apparatus and its control method in bulldozer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Blade apparatus and its control method in bulldozer will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-260486

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.