1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards DRAWING PRACTICE FOR BEARINGS Do Not Use on New Programs. Being Replaced by Global Design Standards EDS-A-1023 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 (Superceded) EDS-A-1023DRAWING PRACTICE FO
2、R BEARINGS PAGE: 1/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology Note: This standard may be applied only for current project drawings generated by CATIA. It is Superceded for all future projects and replaced by Global Design Standards. 1. PURPOSE This
3、 standard aims at correctly and effectively representing bearings on drawings in drafting. 2. SCOPE This standard applies to schematic drawing of bearings. Items not shown in this standard shall conform to KS B 0001 (Mechanical Drawing). 3. SCHEMATIC REPRESENTATION 3.1. Simplified representation If
4、nothing interferes, bearings shall be indicated simply by the method shown in Fig. 1 2.22.16. In any case, the outline shall be drawn to the specified dimensions based on the following standard. Indication of chamfering of adjacent parts shall not be omitted. KS B 2023 Deep groove ball bearings KS B
5、 2024 Angular contact ball bearings KS B 2025 Self-aligning ball bearings KS B 2026 Cylindrical roller bearings KS B 2029 Needle roller bearings KS B 2027 Taper roller bearings KS B 2028 Self-aligning roller bearings KS B 2022 Rolling bearings-Thrust ball bearings with flat back faces KS B 2042 Self
6、-aligning thrust roller bearings 3.2. Detailed indication method 3.2.1. Drawings to help understand bearing types shall conform to Fig. 1 1.21.16. However, in case of representing bearings projected to the direction of the rotating shaft, Fig. 1 1.17 shall be followed. 3.2.2. In case of representing
7、 bearing types by symbols, Fig. 1 2.22.16 shall be followed. However, in case of representing bearings projected to the direction of the rotating shaft, Fig. 1 1.17 shall be followed. 3.2.3. In case of representing bearings by symbols, Fig. 1 2.1 shall be followed. EDS-A-1023DRAWING PRACTICE FOR BEA
8、RINGS PAGE: 2/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology Fig 1. Schematic representation EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 3/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 4. INDICATING SP
9、ECIFICATION, STANDARD PART NUMBER AND NOMINAL NUMBER. In any case of Fig. 1 1.23.2 (deep groove ball bearings), a leader shall be used to indicate the bearing specification, standard part number and nominal number specified in KS B 2012. As shown in Fig. 2, the arrowhead of the leader shall touch th
10、e outline of the bearing, and specification, standard part number and nominal number shall be entered above the other end of the leader. Fig 2. Representation of specification, standard part number and nominal number 5. SCHEMATIC DIAGRAM OF BEARING SYSTEM In case of representing only the frame of be
11、arings to show the system, Fig. 1 3.23.16 and Fig. 3 shall be followed Fig 3. Example of schematic representation of bearings EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 4/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6. HOW TO DRAW BEARING 6.1. Dee
12、p groove ball bearings Draw a circle of a diameter of 2/3 A and with “o“ as the center to represent the contour of the steel ball, and represent contours of the inner and outer rings with a straight line that passes points “e“ and “f“ on the circumference respectively and are parallel with “aa“. Fig
13、 4. Deep groove ball bearing EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 5/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.2. Angular contact ball bearings Draw a circle of a diameter of 2/3 A and with “o“ as the center to represent the contour of t
14、he steel ball, and represent contours of the inner and outer rings with straight lines that pass points “e“, “f“ and “g“ on the circumference respectively and are parallel with “aa“. Fig 5. Angular ball bearing EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 6/14 ISSUED DATE: 1996. 04. 10 REVISED DATE
15、: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.3. Self-aligning ball bearings The intersection point between the center line of the rotary shaft and line “bb“ is designated “o“. Draw a circle of a diameter of A/2, which has a point on “aa“ as the center and adjoins the bearing side, to repr
16、esent the contour of the steel ball, and represent contour of the inner ring with a straight line passing point “e“ on the circumference and is parallel with “aa“. Draw an arc (R: radius) which is centered on “o“ and adjoins the steel ball to represent the outer ring contour. Fig 6. Self-aligning ba
17、ll bearing EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 7/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.4. Cylindrical roller bearings For the type “N“ (Fig.7), draw a square, which has “O“ as the center and has a side length of A/2, to represent t
18、he roller contour. At the threshold side, “ef“ becomes the inner ring contour. At the side without threshold, the inclined straight line “gh“, which passes “g“, apex of the square, and forms an angle of 15g with “aa“, represents the contour. Types “NJ“, “NU“, and “NF“ shall conform to type “N“. For
19、the type “NN“ (Fig. 8), draw the contours of the roller, inner and outer rings on a rectangle which is bisected equally by “bb“ using the drawing method of type “N“. Fig 7. Cylindrical roller bearings Type “N“ Fig 8. Cylindrical roller bearings Type “NN“ EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE:
20、 8/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.5. Needle roller bearings For the type “NA“ (Fig. 9), draw a straight line that passes “e“ and is parallel with “aa“ to represent the inner ring contour. Draw straight lines passing points “f“ and “g“
21、 and are parallel with “aa“ and the line “fg“ to represent the roller contour. Represent the outer ring with line “aa“. Type “RNA“ (Fig. 10) shall conform to type “NA“. Fig 9. Needle roller bearings type NA Fig 10. Needle roller bearings type RNA EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 9/14 IS
22、SUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.6. Taper roller bearings Draw lines “ef“ and “gh“, which pass “o“ and intersect with each other at right angle and designate points “i“ and “j“ which divide the segment “ef“ into 4 equal sections. Draw a stra
23、ight line that passes “i“ and is parallel with “gh“ to represent the outer ring contour. Designate the intersection point “k“ between this line and the extended line of inner ring side and the intersection point “g“ between “gh“ and the outer ring side. And represent the roller contour with lines th
24、at pass through “k“ and “g“ and are parallel with “ef“ and a line that passes through “j“ and is parallel with “gh“. Represent the inner ring contour with “aa“ and “lm“. Fig 11. Taper roller bearings EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 10/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05
25、. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.7. Self-aligning roller bearings The intersection point between the center line of the rotary shaft and line “bb“ is designated “o“. Connect points “e“, “f“ and “O“. Designate points “h“, “i“ and “j“ which divide the segment “fg“ into 4 equal sections. D
26、raw an arc (R= o“h) which is centered on “o“ to represent the outer ring contour. Draw a symmetric arc with respect to point “i“ that passes point “j“. Represent the roller contour with this arc and two parallel lines of width of B/3. Draw the roller contour for oe in the same manner. Draw “lm“, whi
27、ch passes “k“ and is perpendicular to “Of“, and lines passing points “l“ and “m“ and are parallel with “aa“ to represent the inner ring contour. Fig 12. Self-aligning roller bearings EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 11/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 G
28、M DAEWOO Auto & Technology 6.8. Thrust ball bearings with flat back faces 6.8.1. Single row type Draw a circle of a diameter of H/2 and with “o“ as the center to represent the contour of the steel ball, and represent contours of the inner and outer rings with a straight line that passes points “e“ a
29、nd “f“ on the circumference respectively and are parallel with “bb“. Fig 13. Single row thrust ball bearings with flat back faces EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 12/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.8.2. Double row type Des
30、ignate points “e“, “f“, “g“ and “h“ on the rotary ring contour with dimensions designated in the standard, and draw a circle of a diameter of H/4 which passes through “e“ and “f“, and “g“ and “h“ to represent the contour of the steel ball. Designate “i“, “j“, “k“ and “l“ which are intersecting point
31、s between the previous circles and the extended lines of the segments “eg“ and “fh“. Represent the outer ring contour with straight lines “ik“ and “jl“. Fig 14. Double row thrust ball bearings with flat back faces EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 13/14 ISSUED DATE: 1996. 04. 10 REVISED
32、DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 6.9. Self-aligning thrust roller bearings Position of points “o“, “e“ and “f“ are specified in the standard. Designate “h“, the intersection point between a straight line which passes through “o“ and forms 45g to the center shaft and a line w
33、hich is perpendicular to the previous line and passes through “g“. Draw an arc centered on “o“ with “oi“ as the radius, straight line “ej“ which passes through “e“ and is perpendicular to the center shaft, and line “fk“ which passes “f“ and is parallel with the center shaft to represent the outer ri
34、ng contour. Draw an arc symmetric to the arc “jk“ with respect to a line passing “gh“, and straight lines “jl“ and “km“ which are parallel with “oo“ to represent the roller contour. Draw straight lines which pass “m“ and “n“ and are parallel with the center shaft to represent the inner ring contour.
35、 The value of “G“ in the figure is about 1mm. Fig 15. Self-aligning thrust roller bearings EDS-A-1023DRAWING PRACTICE FOR BEARINGS PAGE: 14/14 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 3 GM DAEWOO Auto & Technology 7. COMMON DRAWING METHOD 7.1. The “A“ (note 1), “B“ (radial beari
36、ng width), “T“ (assembly width of taper roller bearing) and “H“ (thrust bearing height) in Fig. 4 to 15 are designated in the standard. Note 1) “A“ is determined by the following formula. (1) In case of the deep groove ball bearing, angular ball bearing, self-aligning ball bearing, cylindrical rolle
37、r bearing, needle roller bearing (inner ring depth), taper roller bearing, self-aligning roller bearing, single row flat-race thrust ball bearing and thrust self-aligning roller bearing D (bearing outside diameter) d (bearing inside diameter) A = - 2 (2) Needle roller bearing (without inner ring) D
38、(bearing outside diameter) dr (roller inside contact circle diameter) A = - 2 (3) Double row flat-race thrust ball bearing D (bearing outside diameter) de (outside ring inside diameter) A = - 2 7.2. Designate “O“, the center of a rectangle with “A“ and “B“, or “T“ and “H“ as its two sides, and “aa“
39、and “bb“, center lines bisecting this rectangle. 7.3. Draw an arc that has the nominal chamfering dimension (r or r1) as its radius for the chamfering portion. 8. RELATED STANDARDS KS B 0001 Technical drawing for mechanical engineering KS B 2012 Nominal number of roller bearings KS B 2022 Rolling be
40、arings-Thrust ball bearings with flat back faces KS B 2023 Deep groove ball bearings KS B 2024 Angular contact ball bearings KS B 2025 Self-aligning ball bearings KS B 2026 Cylindrical roller bearings KS B 2027 Taper roller bearings KS B 2028 Self-aligning roller bearings KS B 2029 Needle roller bearings KS B 2042 Self-aligning thrust roller bearings
