Title of the Invention
Hydraulic Pump designed for higher life and dry run capacity for
helicopter
5 2 Field of the Invention
This invention relates to Design and Development of Hydraulic Pump
for use on military and civil version of Helicopter of 300 kg class. This
hydraulic pump (invention) is installed on the gear ·box of helicopter
engine and it is used to generate hydraulic power for the operation of
10 Primary Flight Control Servo Actuators in Collective, Pitch, Roll and
Yaw Control channels. This invention, in general, relates to hydraulically
operated hydraulic pump having cradle, shoe, plunger, spline shaft,
bearing, seals etc.
3 Background of the Invention
15 Design and Development o... f ~~c};g.P!t?rffif/3000 Kg class, single engine
• (., . ._' ~ 'f:'.JJ,/'f II .
was taken up by platform" user:'"~This' Helicopter consists of Dual
Hydraulic systems and each hydraulic ·system contains three modules
(a) Hydraulic Pump (b) Integrated Hydraulic Package and (c) Flight
Control servo actuators.
20 There was need for the Design and Development of Hydraulic pump to
generate Hydraulic power for the operation of Primary Flight Control
Servo Actuators in collective, Pitch, Roll and Yaw control channels.
Hence, the design and development of proposed invention was takenup
to meet the requirement of helicopter.
25 This invention provides constant hydraulic power for the operation of
flight actuators of Helicopter.
Page 2 of 5
'
Applicant: Hindustan Aeronautics Limited·
4 Brief Summary of the Invention
The pump draws fluid from the reservoir & delivers it to the seniice
system. For a specified cradle (1) (swash plate) angle the flow rate is
approximately proportional to the speed of the pump. The control
5 mechanism acts upon the swash plate (cradle) where tilting angle
determines the stroke of the piston (9) and thus the discharge flow rate.
As the outlet pressure increases, the same is sensed by the spool ( 18)
of compensator assembly