1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS20708/39BAEROSPACESTANDARDAS20708/39 REV. B Issued 1999-07 Revised 2011-07Superseding AS207
5、08/39A Synchro, Control Transformer, Type 19CTB4B FSC 5990 RATIONALE This Revision consists of an update to the Figure 1, to correct over-printed notes in and identification of the Partial SectionA A view. NOTICE This specification is approved for use by all Departments and Agencies of the Departmen
6、t of Defense. The requirements for acquiring the Synchros described herein shall consist of this specification and the latest issue of SAE AS20708. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE
7、 AS20708/39B Page 2 of 61. SCOPE This specification covers the detail requirements for control transformer synchro, type 19CTB4b, 90 volt, 400 cycle. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications s
8、hall apply. The applicable issue of the other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes
9、 applicable laws and regulations unless a specific exemption has been obtained. 2.1 SAE International Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AS20708 Synchro
10、s, General Specification For 2.2 U. S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/.COMMERCIAL ITEM DESCRIPTION A-A-208 Ink, Marki
11、ng, Stencil, Opaque (Porous and Non-porous Surfaces) DEPARTMENT OF DEFENSE STANDARDS MS90406 Gage, Ring, Spline (GO-NO GO) DRAWINGS BUREAU OF ORDNANCE (CAGE 10001) 643019 Clamp Assembly 643090 Washer, Drive 644594 Nut LD 255268 Stock Material for Precision Instrument Components (Copies of these docu
12、ments required by contractors in connection with specific acquisition functions may be obtained from the procuring activity at DSCC.cddwgsdla.mil, or as directed by the contracting officer.) Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking
13、 permitted without license from IHS-,-,-SAE AS20708/39B Page 3 of 63. REQUIREMENTS Qualification: Except when first article testing are required, synchros covered by this specification shall be a product which has been tested and qualified in accordance with Specification SAE AS20708. First article
14、sample: Pending issuance of a Qualified Products List (Q.P.L.), a sample of the synchros to be furnished under this specification shall be subjected to the first article tests as specified in SAE AS20708. All requirements shall be in accordance with SAE AS20708 except as otherwise specified herein.
15、Salt spray requirement: Not applicable. Design and construction: The synchro shall be of the design, construction, and physical dimensions specified in Figure 1, and shall be complete, including all hardware shown and identified thereon. Performance requirements: The values applicable to the synchro
16、 shall be as specified in Table 1. TABLE 1 - SYNCHRO, CONTROL TRANSFORMER, TYPE 19CTB4b Requirement Unit Value FrequencyPrimary voltage (nominal) Primary current (maximum) Primary power (maximum) Transformation ratio 2% Electrical error (maximum) Null voltage total (maximum) Fundamental component of
17、 null voltage (maximum) Friction torque (maximum) Phase shift Primary impedance (Zp) Secondary impedance (Zs) CyclesVoltsMilliampsWattsMinutesMillivoltsMillivoltsOunce-inches DegreesOhms Ohms 40090 7.0 0.250.7358.0 65 35 0.13.0 (lead) 1/1/1/ As specified by the Bureau of Ordnance Copyright SAE Inter
18、national Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS20708/39B Page 4 of 6DATA ELEMENT SPLINE 1/ GEAR 2/TEETH 21 120 PITCH 120 72 PITCH DIAMETER 0.175 +0.000 -0.002 1.6666 +0.0000 -0.0005 OUTSIDE DIAMETER 0.1872 +0.00
19、00 -0.0005 1.6944 +0.0000 -0.0005 PRESSURE ANGLE 20 DEGREES 20 DEGREESROOT DIAMETER MAX. 0.155 1.6282 TOOTH FORM FULL DEPTH INVOLUTE FULL DEPTH INVOLUTE 1/ The end function of this spline is for positive rotational fastenings. It is not to be used as a gear. This spline shall be inspected using the
20、Go-No Go spline ring gage MS90406. 2/ The Outer Diameter (O.D.) of this gear shall be concentric with respect to the 1.5620 diameter collar, within 0.0015. The shaft shall be locked to the outer housing and the shaft mark shall be in line with the outer housing arrow. FIGURE 1 SYNCHRO, CONTROL TRANS
21、FORMER TYPE 19CTB4b Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS20708/39B Page 5 of 6NOTES: 1. Runout of “(1)” (FLANGE) diameters shall not exceed 0.001 Total Indicator Reading (TIR), when
22、measured with the unit in a vertical position, supported by the output shaft, and the housing rotated. 2. Runout of “(2)” diameter (SMOOTH PORTION) of shaft shall not exceed 0.0008 TIR. 3. Full width of surfaces marked “X” shall be perpendicular to shaft diameter marked “(2)” within 0.002 TIR, when
23、measured with the unit in a vertical position, supported by the output shaft, and the housing rotated. 4. End play measured as total movement during reversal of 1.0 pound axial load shall be 0.003 inch MAX. 5. Radial play measured as close to the bearing as possible shall not exceed 0.0006 inches MA
24、X TIR during reversal of 1.0 pound load applied not more than 0.125 (1/8) inch from end of shaft. 6. The design of this unit shall provide for the terminal block to remain fixed, when terminal screws and terminal lugs are removed. 7. The end cap design shall be such that the terminal lug “12-Z-7001-
25、2813” may be installed with the barrel inboard or at 180 degrees position outboard. Recesses for lugs shall be of width and depth to prevent turning of the lugs. 8. Unless otherwise specified, dimensions are in inches, tolerances on decimals 0.005, angles 1 degree. FIGURE 1 SYNCHRO, CONTROL TRANSFOR
26、MER TYPE 19CTB4b CONTINUED. 4. VERIFICATION 4.1 Sampling, Inspection, and Tests Sampling: Except as noted below, sampling shall be in accordance with the requirements of SAE AS20708. First article samples: Unless otherwise specified and pending the issuance of a Q.P.L., four (4) synchros shall be fu
27、rnished by the contractor to the procuring activity for first article testing in accordance with SAE AS20708. Further productions of the item by the contractor prior to the approval of the procuring activity shall be at the contractors risk. Accepted first article samples shall become the property o
28、f the procuring activity and shall be included in the quantity of synchros called for in the contract or order. First article sample for a subsequent contract: If a contractor has delivered synchros previously in accordance with the requirements of this specification and his product has been found t
29、o be satisfactory, the first article sample for any subsequent contract or order may be waived at the discretion of the procuring activity. Inspection and tests: Inspection and tests shall be conducted in accordance with the requirements of SAE AS20708, except as otherwise specified herein. Salt spr
30、ay test: Not applicable. First article rejection criteria: Failure of any first article sample synchro in any test or requirement shall be cause for withholding approval. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without l
31、icense from IHS-,-,-SAE AS20708/39B Page 6 of 65. PACKAGING Preparation for delivery shall be in accordance with the requirements of SAE AS20708, except as otherwise specified herein. 5.1 Hardware All loose hardware shall be packaged in a ventilated envelope made of material having a PH value of 6-8
32、 that is compatible with the weight of the contents. The packaged hardware shall be placed in the unit synchro package. 6. NOTES All notes specified in SAE AS20708 are applicable to this specification and in addition, under ordering data, should specify the following: a. If first article samples are
33、 not required. b. Impedance (see Table 1). Stock Material Miscellaneous stock materials not shown on Figure 1, which may be required for use with synchros, should be selected from LD 255268. Notice: When Government drawings, specifications, or other data are used for any purpose other than in connec
34、tion with a definitely related Government procurement operation, the United States Government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is no
35、t to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. A change bar (|) located in the left margin is for
36、the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are
37、 not used in original publications, nor in documents that contain editorial changes only. PREPARED BY SAE COMMITTEE AE-7A - GENERATORS/CONTROLS/MAGNETIC DEVICES Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
