Hydrostatic or pneumatic drive and method of operating same

Details Hydrostatic or pneumatic drive and method of operating same Hydrostatic or pneumatic drive and method of operating same

1983-06-09

1986-01-14

Garrett, Robert E.

Motors: expansible chamber type

Cyclically operable

Electrically or magnetically actuated or adjusted distributor

91459, 13759617, F01L 2508, F15B 1316, H03K 408

Patent

active

045639396

ABSTRACT:
A hydrostatic or pneumatic drive for driving a mass to be accelerated and decelerated, such as in a die casting or injection moulding machine, has a controllable valve arrangement which is operable to vary the fluid flow rate therethrough. The fluid flow rate is controlled by a reference value control generator operable to produce a ramp having superimposed thereon further control pulses. Such control pulses are a positive control pulse at the beginning of the rising slope and at the end of the falling slope of the ramp and a negative control pulse at the end of the rising slope and at the beginning of the falling slope of the ramp. Each control pulse has a volume which corresponds to a so-called compression volume factor which reflects the compressibility of the fluid used in the drive and also of the elasticity of ducts which expand by fluid pressure.

REFERENCES:
patent: 3385169 (1968-05-01), Hale et al.
patent: 3768373 (1973-10-01), Divigard
patent: 4262784 (1981-04-01), Sibeud
patent: 4481768 (1984-11-01), Goshorn et al.
Kelly, R. E., "Up-Down Ramp Quickens Servo System Response", vol. 51, No. 15, Jul. 20, 1978, Electronics.

Affiliated with

Also associated with

Rating

Hydrostatic or pneumatic drive and method of operating same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hydrostatic or pneumatic drive and method of operating same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrostatic or pneumatic drive and method of operating same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-425511