Enclosure_(1).pdf

Enclosure (1)

NSWCPD Low Speed High Torque Hydraulic Motor Requirements

Scope: This document highlights the overall requirements for one (1) low speed high torque hydraulic motor. All requirements of Tables 1 through 4 and Figures 1 through 5 must be met through the motor design, build and test.

Table 1 ‐ Hydraulic Requirements

No. Characteristic Requirement

1 Fluid Type 2190 TEP (MIL‐L‐17331)

2 Fluid Temperature Range 60° ‐ 140° F

3 Fluid Cleanliness Per NAS 1638, Class 9, for 15‐25 μm particles and per NAS 1638, Class 8, for particles greater than 25 μm

4 Max Rated Pressure 4,500 psi

5 Working Pressure 3000 psi

6 Return Pressure 150 psi

7 Case Drain Pressure 100 psi (Max, operating) 150 psi (Max, intermittent)

8 Fluid Displacement 450 – 525 in3/rev

Max Operating Brake Pressure

3000 psi

Brake Engagement Pressure

< 750 psi

11 Brake Release Pressure > 1,250 psi

Table 2 ‐ Mechanical Requirements

No. Characteristic Requirement

12 Motor Type Fixed displacement radial piston hydraulic motor

13 Piston Count ≥ 14 pistons

14 Piston Type Solid

Torque Rating (Theoretical, 100% Efficiency)

Minimum 5.97 Ft*lbs/psi

16 Hydromechanical Efficiency 90%, Operating

17 Speed 0 through 25 RPM (smooth operation at low speeds)

18 Rotation CW and CCW

19 Brake Type Integrated within motor case. Fails safe (brake applied).

20 Brake Holding Torque 29,000 Ft*lbs (minimum) in both directions

Table 3 ‐ Dimensional and Size Requirements

21 Weight 2250 ± 150 lbs

22 Drive Shaft Dimensions See Figures 1 – 5.

Shaft through hole must penetrate through the entire shaft

Drive Shaft Material Yield Strength

> 60,000 psi

24 Case Dimensions See Figures 1 – 3.

25 Case Mounting Case must assemble to mounting plate as detailed in Figures 1 – 3.

26 Mounting Plate Material MIL‐S‐16216, HY‐80

27 Mounting Screws J429 Grade 8 or equivalent

28 Port Locations See Figures 1 ‐ 3

29 Port Fittings See Figures 1 ‐ 3

30 Motor Orientation Vertical, shaft up

Table 4 ‐ Government Specification Requirements

31 MIL‐STD‐901D Grade B, Medium Weight

32 MIL‐STD‐167A Grade A, Class II, Type A

33 MIL‐STD‐740‐2 Type 2

Figure 1 ‐ Hydraulic Motor Dimensions, Profile View

Figure 2 ‐ Hydraulic Motor Dimensions, Bottom View

Figure 3 ‐ Hydraulic Motor Dimensions, Top View (View C)

Figure 4 ‐ Hydraulic Motor Dimensions, Lower Shaft Detail (View B)

Figure 5 ‐ Hydraulic Motor Dimensions, Upper Shaft Detail (View A)