JB/T 8894-1999 This standard is equivalent to ISO 11055:1996 "Mounting dimensions for clutches of reciprocating internal combustion engines". This standard is used in conjunction with ISO 7648:1987 "Basic dimensions and tolerances of flywheel housings for reciprocating internal combustion engines" and ISO 7648:1991 "Basic dimensions and tolerances of clutch housings for reciprocating internal combustion engines". This standard specifies the basic dimensions and tolerances that affect the interchangeability of flywheels and spring-loaded single-plate or double-plate clutches. This flywheel ratio is used for reciprocating internal combustion engines and flywheel housings and clutch housings involved in ISO 7648 and ISO 7649. Dimensions and tolerances not specified in this standard are determined by the parts manufacturer. This standard is applicable to reciprocating internal combustion engines. However, it does not include aviation and passenger car engines. This standard can also be used for engines for other purposes for which no specific international standards have been established. This standard is published for the first time. JB/T 8894-1999 Installation dimensions for flywheel clutches of reciprocating internal combustion engines JB/T8894-1999 Standard download decompression password: www.bzxz.net

JB/T8894---1999
This standard is equivalent to ISO11055:1996 "Reciprocating internal combustion engine-installation dimensions for clutch". This standard is used in conjunction with ISO7648:1987 "Flywheel housing for reciprocating internal combustion engine-basic dimensions and tolerances" and ISO7649:1991 "Clutch housing for reciprocating internal combustion engine-basic dimensions and tolerances". Appendix A, Appendix B, Appendix C, Appendix D, Appendix E and Appendix F of this standard are all informative appendices. This standard is proposed and managed by the National Technical Committee for Standardization of Internal Combustion Engines. Drafting units of this standard: Shanghai Internal Combustion Engine Research Institute, Wujin Diesel Engine Factory, Wujin Xiaxi Agricultural Machinery General Factory, Wujin No. 1 Gear Factory, Wujin No. 2 Mining Machinery Factory, Wujin Miaoqiao Agricultural Machinery Manufacturing Factory. The main drafters of this standard: Zhai Junming, Xie Feng, Wu Bosong, Luo Peixing, Sun Xiaokun, Xia Chunquan, Xu Zhaoxiang, Zhou Ming. 132
JB/T8894—1999
ISOForeword
The International Organization for Standardization (ISO) is a global federation of national standardization bodies (ISO member bodies). The work of developing international standards is generally carried out by ISO technical committees. Each member body has the right to send representatives to the technical committee established for a subject of interest. International organizations, whether governmental or non-governmental, may also participate in this work by liaising with ISO. ISO and the International Electrotechnical Commission (IEC) work closely together on all aspects of electrical standardization. Draft international standards adopted by the technical committees are circulated to the member bodies for voting. At least 75% of the member bodies must vote in favour for publication as an international standard.
International Standard ISO 11055 was developed by Technical Committee ISO/TC22, Technical Committee for Road Vehicles, Subcommittee SC15, Interchangeability of Components for Commercial Vehicles and Buses.
Appendix A to this International Standard is for information only.
1 Scope
Standard of the Machinery Industry of the People's Republic of China
Flywheels for reciprocating internal combustion engines--Installation dimensions for clutchesJB/T8894
idt ISO 11055: 1996
This standard specifies the basic dimensions and tolerances affecting the interchangeability of flywheels with spring-loaded single-plate or double-plate clutches. This flywheel is used for reciprocating internal combustion engines and flywheel housings and clutch housings involved in ISO7648 and ISO7649. Note 1: The names of ISO7648 and ISO7649 standards are shown in Appendix A (indicative appendix). Dimensions and tolerances not specified in this standard are determined by the parts manufacturer. This standard applies to reciprocating internal combustion engines, but does not include aviation and passenger car engines. This standard can also be used for engines for other purposes for which no specific international standards have been established.
Note 2: It should be recognized that the dimensions shown in this standard may not be applicable to some structures currently in use, but should be used as a measure to rationalize all new designs in the future.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid at the time of publication of this standard. All standards are subject to revision and parties using this standard should investigate the possibility of using the latest versions of the following standards. ISO286-2:1988 ISO systems of tolerances and fits - Part 2: Standard tolerance grades and limit deviation tables for holes and shafts IS1101:1983 Technical drawings - Geometric tolerances Tolerances on shape, orientation, location and run-out - General, definitions, symbols and annotations 3 Flywheel types and specifications
This standard specifies two types of flywheels:
Flat type [see Figure 1 (a)];
Pit type [see Figure 1 (b)].
Both types require the locating stop or locating pin to be aligned with the clutch. The locating hole and the screw hole should be located on the same pitch circle diameter. The dimensions and tolerances in Figure 1 are shown in Tables 1 and 2. For the definition and symbols of geometric tolerances, see IS01101. Approved by the State Machinery Industry Bureau on September 17, 1999 134
Implementation on January 1, 2000
(a) Flat type
JB/T8894--1999
Friction reduction surface
(c) Dimension X and circular runout of friction surface
Figure 1 Flywheel
Rl. 5(max)
(b) Basin type
0.8×45min)
LRo.8(max)
(d) W part enlargement
Friction surface
Dimension code
175340
1380200m
40040021510)
43043023511)
JB/T8894-1999
Table 1 Flywheel for single-plate clutch
-Flat plate type and basin type
1) Dimension A is only a guiding dimension and will be determined by future development. L
See figure!
M104 or 5
2) Dimension B is only used for stopper positioning and cannot be used for locating pin positioning. 3) In some cases, depending on the position of the release bearing, dimension G can be reduced, but this must be agreed upon by the engine manufacturer and the clutch supplier. This issue will be considered in the future. In addition, depending on the design of the clutch torsional vibration damper, dimension Xmin can be increased or decreased, but this must be agreed upon by the engine manufacturer and the clutch supplier. This issue will also be considered in the future. 4) Dimension J can be 48 mm for dimension designation 430. 5) Dimension X is a guideline dimension and is used to ensure that a certain clearance is left between the clutch torsional vibration damper and the flywheel and the crankshaft fixing screw head when the driven plate is completely worn.
When the latter pitch circle diameter and the clutch envelope dimensions are not specified, this dimension allows the clutch to be installed without collision when the clutch plate is worn. 6) See 1SO 286-2.
7) 215 when the engine torque is greater than 750 N·m. 8) The dimension can be reduced when using a flywheel housing size designation No. 3 and a cast iron clutch cover. 9) --0.013D/25.4
Where: D is the measured diameter
In Figure 1(a), D' is between A and B:
--In Figure 1(b), D is between D and B. 10) When the engine torque is greater than 1200N·m, it is 235. 11) When the engine torque is greater than 2200N·m, it is 258. 136
Dimension code
200 or 215
JB/T 8894-
Table 2 Flywheel for dual-plate clutch. Flat type
1) Dimension A is only a guiding dimension and will be determined by future development. E
2) Dimension B is only used for stopper positioning and cannot be used for locating pin positioning. 12
M8 or M108
M10 or M126>
Position see figure
3) In some cases, dimension G can be reduced depending on the bearing position, but this must be agreed upon by the engine manufacturer and the clutch supplier. This issue will be considered in the future. In addition, depending on the design of the clutch torsional vibration damper, dimension Xmin can be increased or decreased, but this must be agreed upon by the engine manufacturer and the clutch supplier. This issue will also be considered in the future. 4) Dimension Xm is a guideline dimension and is used to ensure that the clutch torsional vibration damper has a certain clearance between the flywheel and the crankshaft fixing screw head when the driven plate is completely worn. When the latter pitch circle diameter and clutch footprint dimensions are not specified, this dimension allows the clutch to be installed without collision when the clutch plate is worn.
5) When using flywheel housing size No. 3 and cast iron clutch cover, the dimension can be reduced. 6) The thread size is determined according to the engine torque.
4 Screw holes and dowel pins
Any changes in the arrangement and/or size of screw holes or dowel pins, including the possible need for stepped dowel pins, must be agreed upon by the engine manufacturer and the clutch supplier.
4.1 Screw holes
The number and size of screw holes are listed in Tables 1 and 2. The screw holes should be evenly distributed as shown in Figures 2 to 6. The position tolerances of the screw holes are shown in Figures 6(a) and 6(b). 4.2 Dowel pins
When dowel pins are required, the number and size are listed in Table 1 and their locations are shown in Figures 3 and 4. For flywheels with size designations of 310 mm and above, the flywheel manufacturer may select two or three evenly spaced dowel pins according to the clutch requirements. The flywheel may also be equipped with 12 screw holes and four dowel pin holes (positions I, II, and V), as shown in Figure 4, or 12 screw holes and two or three dowel pin holes as follows:
One or two dowel pin arrangements, positions 1 and II; three dowel pin arrangements, positions 1, I, and V. The position tolerances of the dowel pins are shown in Figure 6(a). 137
JB/T8894—1999
6 × [6o ［
Figure 26 Screw hole arrangement
Figure 36 Screw hole, 3 locating pin arrangement
Location pin V-
JB/T8894-- 1999
Location pin III
Figure 412 Screw hole with 2, 3 or 4 locating pin arrangement 360°
Figure 512 Alternative screw hole arrangement
Location pin
Location pin
Location pin
Note: Datum Y is the axis of the flywheel locating stop. 140
JB/T8894-1999
(a) Positioning pin arrangement
(b) Positioning stop arrangement
Screw hole position tolerance
Min 40. 13 Four
JB/T8894—1999
Appendix A
(Indicative Appendix)
References
(1) ISO7648:1987 Flywheel housings for reciprocating internal combustion engines - Basic dimensions and tolerances (2) ISO7649:1991 Clutch housings for reciprocating internal combustion engines - Basic dimensions and tolerances Appendix B
(Indicative Appendix)
Flywheels for single-piece spring-loaded clutches
B1 Scope
This standard aims to promote the standardization of flywheels for spring-loaded clutches of the lower type. SAF J618:1991
This standard applies to flywheels for dry spring-loaded clutches of internal combustion engines. Figure B1 and Tables B1, B2 and B3 show the flywheel data currently used in the industry. Clutches of other sizes are also manufactured. The dimensions given are mainly for single-plate clutches. The same dimensions can be used for double-plate clutches as long as a connecting piece is installed between the intermediate plate and the second driven plate. If the flywheel needs to be thickened to accommodate the intermediate plate and the second driven plate, the clutch manufacturer can be consulted for the required dimensions J and the transmission layout of the intermediate plate. For flywheels for type 14 and 15.5 double-plate pull clutches, see SAE J1806.
B2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid when this standard is published. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. SAEJ1033:1988 Specification for measuring the inner hole and end face runout of flywheels, flywheel housings and flywheel housing connections SAEJ1806:1987 Dimensions of clutches for trucks and buses ANSI/ASMEB1.1:1989 Standards - Inch threads (UN and UNR thread forms) ISO965-3:1980 General purpose metric thread tolerances Part 3: Deviations of machined threads B3 tolerances
The maximum radial runout of the guide bearing hole or clutch locating hole is 0.13mm. The maximum end face runout of the clutch mounting surface and friction surface at a measuring diameter of 25.4mm is 0.013mm. See SAEJ1033 for the specification for measuring the inner hole and end face runout. B4 screw hole
The screw hole should be tapped according to the 6H grade coarse thread series of ISO965-3 or the UNC2B grade thread of ANSIB1.1. The minimum thread engagement length for gray cast iron flywheels should be 1.5 times the bolt diameter, and for ductile iron flywheels should be 1.0 times the bolt diameter. 141
Oil drain hole 3 × 7. 9
Clutch
Basic size
255(10.0)
280(11.0)
305(12.0)
330(13.0)
355(14.0)
380(15.0)
JB/T8894--1999
General Air hole 6×12.7
Grinding South Pole
R0.8(max）Oil drain hole
0.8×45″
Guide bearing hole distance
Flywheel housing end face depth
Flat type
Ro.8(max)
1.5(max）
-0.8X45°
6 Screw hole spacing when the screw holes are arranged in pairs
Standard dimensions of flat-type or pot-type flywheels
1) Some sizes of pot-type clutches may not yet be available. G
2) K is the length of the guide bearing hole, and L is the basic diameter of the guide bearing. The diameter and fit should meet the installation requirements, 3) Most flat-type clutches are positioned by mounting bolts instead of positioning diameters. Table B2
Clutch
Basic dimensions
150 (6.0)
Clutch installation dimensions for flat-type flywheels
Number of screw holes
Arrangement of screw holes
Screw hole spacing
mm (in)
mm (in)
Screw hole size
(5/16-18)
(5/16 18)
(516 18)
(5/16 18)
Clutch
Basic size
255(10.0)
255(10.0)
280(11.0)
280(11.0)
305(12.0)
330(13.0)
330(13.0)
355(14.0)
355(14.0)
JB/T8894—1999
Continued Table B2
Number of screw holes
Arrangement of screw holes
Note: Clutch The first flywheel listed in the gear size of the gear is the recommended structure for this size, and the second structure is also used. Bolt hole spacing
imm(in)）
Screw hole spacing
(5/16-18)
(3/16-18)
(5/1618)
(5/16-18)
(3/8-16)
(3/8-16)2:
(3/8-16)
(3/8-16)
(3/8-16)
(3/8 16)
(3/8-16)
1）Most plate-type clutches are positioned by mounting bolts instead of diameters. The dimensions listed are the minimum diameters required for clutch clearance. 2) 5/16-18 can also be used.
Clutch
Basic dimensions
255(10)
255(10)
280(11)
280(11)
305(12)
355(14)
355(14)
380(15)
Clutch installation dimensions for pot-type flywheels
Number of screw holes
Note: Flat-plate flywheels are generally recommended, not pot-type flywheels. 1) The clutch locating hole diameter tolerance is '\*mm. 2) There is also a specification with a pot depth of 37.59.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)59 specifications.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)59 specifications.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)59 specifications.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)59 specifications.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)1991
This standard applies to flywheels for use with dry spring-loaded clutches for internal combustion engines. Figure B1 and Tables B1, B2 and B3 show the flywheel data currently used in the industry. Clutches of other sizes are also manufactured. The dimensions given are mainly for single-plate clutches. The same dimensions can be used for two-plate clutches as long as a connecting piece is installed between the intermediate plate and the second driven plate. If the flywheel is to be thickened to accommodate the intermediate plate and the second driven plate, the clutch manufacturer can be consulted for the required dimensions J and the transmission arrangement of the intermediate plate. For flywheels of size 14 and 15.5 two-plate pull clutches, see SAE J1806.
B2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision and parties using this standard should investigate the possibility of using the latest version of the following standards. SAEJ1033:1988 Specification for measuring the inner hole and end face runout of flywheels, flywheel housings and flywheel housing connections SAEJ1806:1987 Dimensions of clutches for trucks and buses ANSI/ASMEB1.1:1989 Standards - Inch threads (UN and UNR thread forms) ISO965-3:1980 General purpose metric thread tolerances Part 3: Deviations of machined threads B3 tolerances
The maximum radial runout of the guide bearing hole or clutch locating hole is 0.13mm. The maximum end face runout of the clutch mounting surface and friction surface at a measuring diameter of 25.4mm is 0.013mm. See SAEJ1033 for the specification for measuring the inner hole and end face runout. B4 screw hole
The screw hole should be tapped according to the 6H coarse thread series of ISO965-3 or the UNC2B thread of ANSIB1.1. The minimum thread engagement length for gray cast iron flywheels should be 1.5 times the bolt diameter, and for ductile iron flywheels should be 1.0 times the bolt diameter. 141
Oil drain hole 3 × 7. 9
Clutch
Basic size
255(10.0)
280(11.0)
305(12.0)
330(13.0)
355(14.0)
380(15.0)
JB/T8894--1999
General Air hole 6×12.7
Grinding South Pole
R0.8(max）Oil drain hole
0.8×45″
Guide bearing hole distance
Flywheel housing end face depth
Flat plate
Ro.8(max)
1.5(max）
-0.8X45°
6 Screw hole spacing when the screw holes are arranged in pairs
Standard dimensions of flat-type or pot-type flywheels
1) Some sizes of pot-type clutches may not yet be available. G
2) K is the length of the guide bearing hole, and L is the basic diameter of the guide bearing. The diameter and fit should meet the installation requirements, 3) Most flat-type clutches are positioned by mounting bolts instead of positioning diameters. Table B2
Clutch
Basic dimensions
150 (6.0)
Clutch installation dimensions for flat-type flywheels
Number of screw holes
Arrangement of screw holes
Screw hole spacing
mm (in)
mm (in)
Screw hole size
(5/16-18)
(5/16 18)
(516 18)
(5/16 18)
Clutch
Basic size
255(10.0)
255(10.0)
280(11.0)
280(11.0)
305(12.0)
330(13.0)
330(13.0)
355(14.0)
355(14.0)
JB/T8894—1999
Continued Table B2
Number of screw holes
Arrangement of screw holes
Note: Clutch The first flywheel listed in the gear size of the gear is the recommended structure for this size, and the second structure is also used. Bolt hole spacing
imm(in)）
Screw hole spacing
(5/16-18)
(3/16-18)
(5/1618)
(5/16-18)
(3/8-16)
(3/8-16)2:
(3/8-16)
(3/8-16)
(3/8-16)
(3/8 16)
(3/8-16)
1）Most plate-type clutches are positioned by mounting bolts instead of diameters. The dimensions listed are the minimum diameters required for clutch clearance. 2) 5/16-18 can also be used.
Clutch
Basic dimensions
255(10)
255(10)
280(11)
280(11)
305(12)
355(14)
355(14)
380(15)
Clutch installation dimensions for pot-type flywheels
Number of screw holes
Note: Flat-plate flywheels are generally recommended, not pot-type flywheels. 1) The clutch locating hole diameter tolerance is '\*mm. 2) There is also a specification with a pot depth of 37.59.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)1991
This standard applies to flywheels for use with dry spring-loaded clutches for internal combustion engines. Figure B1 and Tables B1, B2 and B3 show the flywheel data currently used in the industry. Clutches of other sizes are also manufactured. The dimensions given are mainly for single-plate clutches. The same dimensions can be used for two-plate clutches as long as a connecting piece is installed between the intermediate plate and the second driven plate. If the flywheel is to be thickened to accommodate the intermediate plate and the second driven plate, the clutch manufacturer can be consulted for the required dimensions J and the transmission arrangement of the intermediate plate. For flywheels of size 14 and 15.5 two-plate pull clutches, see SAE J1806.
B2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision and parties using this standard should investigate the possibility of using the latest version of the following standards. SAEJ1033:1988 Specification for measuring the inner hole and end face runout of flywheels, flywheel housings and flywheel housing connections SAEJ1806:1987 Dimensions of clutches for trucks and buses ANSI/ASMEB1.1:1989 Standards - Inch threads (UN and UNR thread forms) ISO965-3:1980 General purpose metric thread tolerances Part 3: Deviations of machined threads B3 tolerances
The maximum radial runout of the guide bearing hole or clutch locating hole is 0.13mm. The maximum end face runout of the clutch mounting surface and friction surface at a measuring diameter of 25.4mm is 0.013mm. See SAEJ1033 for the specification for measuring the inner hole and end face runout. B4 screw hole
The screw hole should be tapped according to the 6H coarse thread series of ISO965-3 or the UNC2B thread of ANSIB1.1. The minimum thread engagement length for gray cast iron flywheels should be 1.5 times the bolt diameter, and for ductile iron flywheels should be 1.0 times the bolt diameter. 141
Oil drain hole 3 × 7. 9
Clutch
Basic size
255(10.0)
280(11.0)
305(12.0)
330(13.0)
355(14.0)
380(15.0)
JB/T8894--1999
General Air hole 6×12.7
Grinding South Pole
R0.8(max）Oil drain hole
0.8×45″
Guide bearing hole distance
Flywheel housing end face depth
Flat type
Ro.8(max)
1.5(max）
-0.8X45°
6 Screw hole spacing when the screw holes are arranged in pairs
Standard dimensions of flat-type or pot-type flywheels
1) Some sizes of pot-type clutches may not yet be available. G
2) K is the length of the guide bearing hole, and L is the basic diameter of the guide bearing. The diameter and fit should meet the installation requirements, 3) Most flat-type clutches are positioned by mounting bolts instead of positioning diameters. Table B2
Clutch
Basic dimensions
150 (6.0)
Clutch installation dimensions for flat-type flywheels
Number of screw holes
Arrangement of screw holes
Screw hole spacing
mm (in)
mm (in)
Screw hole size
(5/16-18)
(5/16 18)
(516 18)
(5/16 18)
Clutch
Basic size
255(10.0)
255(10.0)
280(11.0)
280(11.0)
305(12.0)
330(13.0)
330(13.0)
355(14.0)
355(14.0)
JB/T8894—1999
Continued Table B2
Number of screw holes
Arrangement of screw holes
Note: Clutch The first flywheel listed in the gear size of the gear is the recommended structure for this size, and the second structure is also used. Bolt hole spacing
imm(in)）
Screw hole spacing
(5/16-18)
(3/16-18)
(5/1618)
(5/16-18)
(3/8-16)
(3/8-16)2:
(3/8-16)
(3/8-16)
(3/8-16)
(3/8 16)
(3/8-16)
1）Most plate-type clutches are positioned by mounting bolts instead of diameters. The dimensions listed are the minimum diameters required for clutch clearance. 2) 5/16-18 can also be used.
ClutchwwW.bzxz.Net
Basic dimensions
255(10)
255(10)
280(11)
280(11)
305(12)
355(14)
355(14)
380(15)
Clutch installation dimensions for pot-type flywheels
Number of screw holes
Note: Flat-plate flywheels are generally recommended, not pot-type flywheels. 1) The clutch locating hole diameter tolerance is '\*mm. 2) There is also a specification with a pot depth of 37.59.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)8X45°
6 screw hole pairs are arranged
Standard size of flat or pot-shaped flywheel
1) Some sizes of pot-shaped clutches may not be available yet. G
2) K is the length of the guide bearing hole, and L is the basic diameter of the guide bearing. The diameter and fit should meet the installation requirements. 3) Most flat-type clutches are positioned by mounting bolts instead of positioning diameters. Table B2
Clutch
Basic dimensions
150（6.0)
Clutch installation dimensions for flat flywheel
Number of screw holes
Arrangement of screw holes
Pitch of screw holes
mm(in)
mm(in)
Screw hole size
(5/16-18)
(5/16 18)
(516 18)
(5/16 18)
Clutch
Basic size
255(10.0)
255(10.0)
280(11.0)
280(11.0)
305(12.0)
330(13.0)
330(13.0)
355(14.0)
355(14.0)
JB/T8894—1999
Continued Table B2
Number of screw holes
Arrangement of screw holes
Note: The first flywheel listed in each gear size of the clutch is the recommended structure in that size, and the second structure is also used. Screw hole spacing
imm(in)）
Screw hole spacing
(5/16-18)
(3/16-18)
(5/1618)
(5/16-18)
(3/8-16)
(3/8-16)2:
(3/8-16)
(3/8-16)
(3/8-16)
(3/8 16)
(3/8-16)
1）Most plate-type clutches are located with mounting bolts instead of diameters. The sizes listed are the minimum diameters required for clutch clearance. 2) 5/16-18 can also be used.
Clutch
Basic dimensions
255(10)
255(10)
280(11)
280(11)
305(12)
355(14)
355(14)
380(15)
Clutch installation dimensions for pot-type flywheel
Number of screw holes
Note: Generally, a flat-plate flywheel is recommended, not a pot-type flywheel. 1) The diameter tolerance of the clutch positioning hole is '\*mm. 2) There is also a specification with a pot depth of 37.59.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)8X45°
6 screw hole pairs are arranged
Standard size of flat or pot-shaped flywheel
1) Some sizes of pot-shaped clutches may not be available yet. G
2) K is the length of the guide bearing hole, and L is the basic diameter of the guide bearing. The diameter and fit should meet the installation requirements. 3) Most flat-type clutches are positioned by mounting bolts instead of positioning diameters. Table B2
Clutch
Basic dimensions
150（6.0)
Clutch installation dimensions for flat flywheel
Number of screw holes
Arrangement of screw holes
Pitch of screw holes
mm(in)
mm(in)
Screw hole size
(5/16-18)
(5/16 18)
(516 18)
(5/16 18)
Clutch
Basic size
255(10.0)
255(10.0)
280(11.0)
280(11.0)
305(12.0)
330(13.0)
330(13.0)
355(14.0)
355(14.0)
JB/T8894—1999
Continued Table B2
Number of screw holes
Arrangement of screw holes
Note: The first flywheel listed in each gear size of the clutch is the recommended structure in that size, and the second structure is also used. Screw hole spacing
imm(in)）
Screw hole spacing
(5/16-18)
(3/16-18)
(5/1618)
(5/16-18)
(3/8-16)
(3/8-16)2:
(3/8-16)
(3/8-16)
(3/8-16)
(3/8 16)
(3/8-16)
1）Most plate-type clutches are located with mounting bolts instead of diameters. The sizes listed are the minimum diameters required for clutch clearance. 2) 5/16-18 can also be used.
Clutch
Basic dimensions
255(10)
255(10)
280(11)
280(11)
305(12)
355(14)
355(14)
380(15)
Clutch installation dimensions for pot-type flywheel
Number of screw holes
Note: Generally, a flat-plate flywheel is recommended, not a pot-type flywheel. 1) The clutch positioning hole diameter tolerance is '\*mm. 2) There is also a specification with a pot depth of 37.59.
Screw hole arrangement
Screw hole diameter
mm(in)
Screw hole size
(5/16 18)
(3/8-16)
(5/16-18)
(11213)
(3/8-16)
(3/8-16)
(3/8 16)
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