1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2011 01 04 N-STATUS Replaced by WSS-M2D513-A A. Wedepohl, NA 2004 06 28 Revised Para 3.0 inserted; para 3.12 & 4 deleted 1963 08 16 Released AS2-366 Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 1 of 3 HOSE
2、, LOW PRESSURE - POWER STEERING ESA-M2D122-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a low burst, low pressure hydraulic hose. 2. APPLICATION This specification was released originally for material used as return lines on hydraulic power steering units fo
3、r automotive purposes. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 HOSE CONSTRUCTION Shall have a synthetic rubber inner tube, one or more fa
4、bric braids and a smooth synthetic rubber cover. The inner tube shall consist of a non-blooming synthetic rubber compound, capable of effectively resisting deterioration by an approved Ford Motor Company power steering fluid. The reinforcement shall consist of one or more rayon braids which are free
5、 from knots. The outer cover shall be of black stock, non-blooming, oil and abrasion resistant, smooth, synthetic rubber compound, of uniform thickness. 3.2 VOLUME SWELL, Inner Tube, max (ASTM D 380) 3.2.1 Immersion in Ford Motor Company 80% Approved Power Steering Fluid (70 h at 121 +/- 3 C) 3.2.2
6、Immersion in ASTM No. 3 Oil 110% (70 h at 121 +/- 3 C) 3.3 100% PROOF PRESSURE, min Test Method: Before shipment by the supplier every complete hose assembly shall be given a proof pressure test, using air or water as the pressure medium. Special care should be taken when testing with air due to its
7、 explosive nature at high pressures. The pressure shall be held for not less than 30 s or more than 60 s. Hose assemblies showing leaks under this test shall be rejected and destroyed. 3/8 in ID 350 psi (2.4 MPa) 1/2 in ID 350 psi (2.4 MPa) 3/4 in ID 175 psi (1.2 MPa) ENGINEERING MATERIAL SPECIFICAT
8、IONESA-M2D122-A Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 3 3.4 BURST PRESSURE, min (ASTM D 380) Test Method: Test under hydraulic pressure, with oil or hydraulic brake fluid as the pressure medium. Each sample of hose must withstand proof pressure for 2
9、 min, after which the pressure shall be gradually raised until failure occurs. At least 4 hoses from each lot shall be burst tested and any lot from which a hose fails at less than the minimum specification shall be considered unsatisfactory. 3/8 in ID 1000 psi (6.9 MPa) 1/2 in ID 700 psi (4.8 MPa)
10、3/4 in ID 350 psi (2.4 MPa) 3.5 LOW TEMPERATURE FLEXIBILITY No cracking or breaking Test Method: Condition the hose in a cold box in a straight position at -40 C for 70 h. After conditioning bend the hose, while still in the cold, around a temperature conditioned mandrel having a diameter 10 times t
11、he outside diameter of the specimen. 3.6 TEMPERATURE RANGE Continuous Usage -40 to +135 C Intermittent Usage 149 C 3.7 ADHESION, min (ASTM D 380) Cover to Ply 10 lb/in (1.8 kN/m) Ply to Tube 8 lb/in (1.4 kN/m) 3.8 AGING No cracks, charring or disintegration externally or internally when hose is stra
12、ightened after being over a form (see chart for radius) for a period of 70 h in an oven at 102 +/- 3 C. Specimen Length Radius of Form ID, in in (mm) in (mm) 1/4 9 (225) 1-1/2 (38) 3/8 10 (250) 1-3/4 (44) 1/2 11 (275) 2 (51) 5/8 12 (300) 2-1/4 (57) 3/4 14 (350) 2-1/2 (64) 1 16 (400) 3-1/4 (82) 3.9 O
13、ZONE RATING, Cover 0 (FLTM BP 101-01), max 3.10 TENSILE STRENGTH, min 450 lb (ASTM D 380) (2 kN) ENGINEERING MATERIAL SPECIFICATIONESA-M2D122-A Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 3 Test Method: The assembly when fixed in the testing machine and pu
14、lled at a speed of approximately 1 in (25 mm)/min shall not separate the end fittings from the hose or rupture the hose structure at less than the specified minimum pull. Hose used for this test must be at least 7 days old. 3.11 IMPULSE RESISTANCE Test Method: The hose must satisfactorily pass the f
15、ollowing impulse test without failure on a hose test machine. Oil Temperature 132 - 138 C Ambient Temperature 93 - 107 C Pulsating Pressure Bend Radius ID, in psi (MPa) in (mm) 3/8 0 - 100 (0.7) 3.5 (89) 1/2 0 - 200 (1.4) 5.0 (127) 3/4 0 - 140 (1.0) 6.0 (152) Cycle Rate 30 - 40/min Pressure Rise Tim
16、e 0.2 +/- 0.02 s High Pressure Hold Time 0.65 +/- 0.2 s Pressure Drop Time 0.2 +/- 0.1 s Samples submitted to this test shall exceed 100,000 cycles without failure for receiving inspection tests and 700,000 cycles for engineering approval tests. Test oil to be type “A“, unless other-wise agreed upon between customer and supplier.
