1、DC 621.43-562 : 629.1 1 DEUTSCHE NORM October 1988 Flywheel housings for reciprocating internal combustion engines Nominal dimensions and tolerances (IS0 7648 : 1987) DIN IS0 7648 - Hubkolben-Verbrennungsmotoren - Schwungradgehuse - Mae (IS0 7648 : 1987) This standard incorporates International Stan
2、dard IS0 7648 : 1987 Flywheel housings for reciprocating internal combustion engines - Nominal dimensions and tolerances. A comma is used as the decimal marker. National foreword This standard has been prepared by ISO/TC 22. The responsible German body involved in its preparation was the Normenaussc
3、hu Kraftfahrzeuge (Road Vehicle Engineering Standards Committee). IS0 Standard comprises 8 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN IS0 7648 : 1988-1 Y Deutsches Institut fr Normung e. V., Berlin. wth Verlag GmbH, D-10772 Berlin, has the exclusiv
4、e right of sale for German Standards (DIN-Normen). English price group 08 Sales No. 0408 02.99 COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesCOPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 1
5、IS0 7648 : 1987 Flywheel housings for reciprocating internal combustion engines Nominal dimensions and tolerances Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standard
6、s is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also tak
7、e part in the work. Draft International Standards adopted by the technical cornmittees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the m
8、ember bodies voting. International Standard IS0 7648 was prepared by Technical Committee ISO/TC 22, Road vehicles. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition,
9、unless dtnerwise stated. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 2 IS0 7648 : 1987 1 This International Standard specifies the nominal dimensions and tolerances of flywheel housings for reciprocating internal combustion engines, in part
10、icular those which affect inter- changeability with mating parts. It applies to reciprocating internal combustion engines except engines for aircraft and passenger cars. Flywheel housings of size codes 1 to 4 are recommended for commercial vehicles and buses. Scope and field of application 2 Referen
11、ces IS0 273, Fasteners - Clearance holes for bolts and screws. IS0 1101, Technical drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, s yrnbols, indications on drawings. IS0 7649, Commercial vehicles - Clutch housings for internal
12、 combustion engines - Nominal dimensions and tolerances. 3 Nominal dimensions and tolerances 3.1 Flywheel housing See figure 1 and table 1. 1) At present at the stage of draft. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 3 IS0 7648 : 1987 T
13、able 1 - Flywheel housing dimensions and tolerances Size code M o1 O0 O 112 1 2 3 4 5 6 nom. 1 245 1010.00 787.40 47,70 584,20 511,18 44793 409.58 361.95 314.32 266.70 A t01. + 0.25 + 0.25 O + 0,25 O + 0.25 O + 0.20 O + 0,13 O + 0.13 O + 0.13 O + 0.13 O + 0,13 O f 0.13 O Run-out lassernbled flywheel
14、 housing) f not applicable 0,47 0.3 0,35 0,31 0.27 0.25 0.25 0,25 0.25 Dimensions in millimetres B nom. 1400 1 165 883 71 1 648 553 489 451 404 356 308 D* min. 10 10 8 8 8 8 0 8 8 8 8 Dimension D relates to flywheel housings without rubber sealing. However, this dimension may be increased if a rubbe
15、r seal is necessary NOTE - Run-out tolerances t shall be measured on the assembled engine mounted on its supports in accordance with the annex. (See IC0 1101 for definition of run-out.) Dimensions in millimetres X U e X I Figure 1 - Flywheel housing COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.-
16、 EnglishLicensed by Information Handling ServicesPage 4 IS0 7648 : 1987 3.2 Bolt or screw spacing and size 3.2.1 Dimensions and tolerances See figure 1 and table 2. code o2 o1 00 O 1 I2 1 2 3 4 5 6 Table 2 - Tapped holes and bolt or screw spacing and dimensions Number 24 24 16 16 12 12 12 12 12 8 8
17、Tapped holes Size I Size M16 M16 M12 M12 M12 M10“ M10 M10 M10 M10 M10 Recommended thread engagement C nom. mm (see figures 1 and 21 1340,oo 1 105,OO 850.90 679.45 619.12 5302 466.72 428,62 381,oO 333,38 285.75 M12 may be used for high engine torque applications NOTE - 24 tapped holes are optional fo
18、r aluminium flywheel housings of size code 1, 3.2.2 Spacing Tapped holes shall be spaced equally on each side of the vertical and horizontal axis lines as shown in figure 2. + a) 8 tapped hole spacing Dimensions in millimetres + P b) 12 tapped hole spacing 4 c) 16 tapped hole spacing di 24 tapped ho
19、le spacing Figure 2 - Bolt or screw hole spacing COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 5 IS0 7648 : 1987 o2 o1 00 O 112 1 2 3 4 5 6 4 Relationship of pilot bearing bore to flywheel housing The depth of the pilot bearing bore (see E in
20、 figure 3) extends from the flywheel housing face to a shoulder in the flywheel, to a shoulder within the crankshaft or to the crankshaft flange face. 265 - 265 100 133,4 100 133,4 100 133,4 100 - 112“ 133.4 100 112“ 100 - 100 - 71 - 71 - Table 3 - Depth of pilot bearing bore Dimensions in millimetr
21、es E nom. optional for: Cirecode I ,“, 1 double plate clutches when extra-heavy flywheel is used overcentre clutch - 71 100 - 1) An E dimension of 112 mm is optional for flywheel housing size codes 1 and 2 when the clutch shatt bearing is located in the pilot bearing bore of the flywheel or cranksha
22、ft end, .e. when the bearing is not located in a separate carrier. Crankshaft flange face Ifor size code 01, 02) Shoulder in flywheel / Shoulder in crankshaft Pilot bearing bore in crankshaft end or flywheel (for size codes O0 to 6) Figure 3 - Depth of pilot bearing bore COPYRIGHT DIN DEUTSCHES Inst
23、itut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 6 IS0 7648 : 1987 5 Mating part flange (for example, clutch housings) The dimensions and tolerances of clutch housings for reciprocating internal combustion engines are given in IS0 7649. Limits and fits of the pilot diamete
24、r of the mating part are at the discretion of the manufacturer of that component. The manufacturer shall also specify the tolerances of form and position of the mating part flange. The clearance holes of the mating part flange shall have the same location as specified under 3.2.2 and shall be in acc
25、ordance with IS0 273. Procedure for measuring bore eccentricity and face deviation (This annex forms an integral part of the Standard.) A.2.2 Eccentricity of housing A.l Scope This annex provides a uniform procedure for measuring bore eccentricity and face deviation (run-out) of flywheel housings af
26、ter assembly to an engine. Limits of bore eccentricity and face deviation are Given in table 1. A.2 Measuring procedures A.2.1 General A.2.1.1 A dial indicator with rigid extension bars is required. A.2.1.2 Surfaces which are to be measured shall be free from dirt and burrs. A.2.2.1 Mount the indica
27、tor base on the flywheel or crank- shaft flange as close as possible to the housing pilot bore to minimize deflection. A.2.2.2 Adjust the indicator point to be perpendicular to the housing pilot bore and set at zero in the 6 oclock (mandatory) position (lower vertical). A.2.2.3 Slowly rotate the cra
28、nkshaft and record the indicator reading along with the appropriate positive or negative sign at the 9 oclock (a), 12 oclock b). and 3 oclock (c) locations. Confirm that the 6 oclock reading is still zero. Record the read- ings on line A in table 4, being sure to include the positive or negative sig
29、n. A.2.1.3 mining bore eccentricity. Prepare a chart as shown in table 4 to help in deter- Table 4 - Data chart Designation I 6 oclock I 9 oclock I 12 oclock 1 3 oclock A Observed indicaror reading B Adjustment for bearing clearance C Haif-bearing clearance adjustment D Total corrected vertical indi
30、cator reading E Corrected horizontal indicator reading F Total horizontal indicator reading I,=h+d E, = a + dl2 E2 = c + d!2 I, = E1 E2 I, = 4- a= - d/2 = E, = h= d= - - c= - dl2 = E2 = CAUTION - Sign designation relative to direction of indicator tip movement is not the same for all indicators. For
31、 all measurements in the calculations carried out in accordance with A.2.2, outward movement of the indicator tip with respect to the centre of the bore being measured is to be considered a negative reading. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling S
32、ervicesPage 7 IS0 7648 : 1987 Resultant total indicator reading, 1, 0,60 0,55 0,50 0,45 0,40 E E O 5 0,30 7 .- + 0,25 ._ m Oll 5 o, 10 0,05 Total horizontal indicator reading, IH, rnm Figure 4 - Resultant total indicator reading, IR A.2.2.4 Position the indicator at the 12 oclock location and determ
33、ine d, the adjustment for clearance in the main bearing adjacent to the flywheel, by an appropriate method, for exam- ple by raising the crankshaft to its upper limit. Record the adjustment for bearing clearance on line B in table 4 in the 12 oclock column. This value shall always be positive. NOTE
34、- A floor-mounted support with a padded prybar or other suitable means can be used to raise the flywheel; however it should not be forced beyond the point where the bearing clearance has been removed, nor should the housing be used as a fulcrum. A.2.2.5 Correct the 12 oclock reading obtained in A.2.
35、2.3 by algebraically adding the adjustment for bearing clearance to it. This is the corrected total vertical indicator reading UV). Record this value on line D in table 4. A.2.2.6 Correct the 3 oclock and 9 oclock readings from A.2.2.3 by algebraically adding an amount equal to one-half of the adjus
36、tment for bearing clearance determined in A.2.2.4 to each of them. This can be done by taking the clearance adjust- ment determined in A.2.2.4, dividing it by two, and entering it on line C in the 3 oclock and 9 oclock columns. Again, this value will always be positive. The readings, corrected for b
37、ear- ing clearance, can then be obtained by algebraically summing the values in lines A and C of the 3 oclock and 9 oclock columns. These values shall be denoted as E, and E2 and entered on line E in table 4. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling
38、ServicesPage 8 IS0 7648 : 1987 A.2.2.7 Determine the horizontal indicator reading (1,) by taking the algebraic difference between the corrected 3 oclock and 9 oclock readings (IH = El - E2). This value is to be entered on line F in table 4. A.2.2.8 Determine the resultant total indicator reading (1,
39、) of the housing or adapter by locating the intersection point of the total vertical indicator reading (iv) and the total horizontal indi- cator reading (IH) in figure 4, or calculate as follows : I, = JCf“i2 + (f,P NOTE - This value if,) is consistent with a total indicator type reading as are the
40、limits specified in table 1. It is not eccentricity as such. Actual eccentricity is equal to one-half of this value. A.2.3 Face deviaton of housing A.2.3.1 Mount the indicator base in accordance with A.2.2.1. A.2.3.2 Adjust the indicator point to be perpendicular to the face. A.2.3.3 After eliminati
41、ng the crankshaft end play, e.g., by tilting the crankshaft or by inclining the engine approximately 15O to 20, set the dial indicator to zero in the 6 oclock (not mandatory) position. A.2.3.4 Taking care to keep the end play eliminated in the same direction as in the 6 oclock position, rotate the crank- shaft one complete revolution to determine the total indicator reading. A.2.3.5 compare the total indicator reading with the limit specified in table 1. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling Services
