Por d i f f e r e n t f i e l d s of application involving f i n e mechanics, see D I N Sheet 1 Section 4, Table I column 1 s p e c i f i e s a range. DIN Spur Gear Drives for Fine Mechanics; Tables. DIN Spur Gear Drives for Fine Mechanics; Indication in Drawings, Examples for Calculation.
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The acceptance for tooth Systeme mainly consists of a cumulative e r r o r testing r o l l testing. 58450 and allowances for housing AB understood in this Standard, t h e t e m housing r e f e r e t o the component connecting the bearings of a p a i r of mating gears. I test flanges a r e provi0ed f o r setting up purposes, the permissible radial eccentricity f applies t o these.
The uncertainty i n measurement due t o var i at i dim of the measuring Observance of t h e s p e c i fi e ein allowances may be determined d i r e c te. The tolerances and allowances etated’in the following Tables apply to gears according to D M Sheet 1, Section 2.
Base tanuent lenuth allowances; dual cone width allowances; Dem.
For grades P 8 it is recommended that the tip cylinder should be used for setting up the gear blank, or that test flanges should be provided. If the c h a r t feed i s operated and a t ra c e drawn corresponding t o t he upper and lower allowance, two concentric c i r c l e s a r e obtained if the recording i a made in pol ar Co-ordinates see Figure 5 and two p a r a l l e l s diin r a i g h t lines i f the recording i s made 5405 n rectangular Co-ordinates see Figure 6.
The e r r o r t r a c e must remain between the two l i n e s previously drawn which represent the 54805 r i e s of t h e tolerance zone. The reference diameter to which the axial eccentricity is related is found as: The difference between the upper and the lower allowance of the tip circle ia appended as a minus tolerance.
This i s performed a s follows: Like the base tangent length allowances, compliance with the dual cone width allowances can a l s o be determined by t h e dual flank r o l l t e s t i n The procedure i s the same as t h a t described under Section 4.
Base tannent lenRth allowances; dual cone width allowances; Derm. The cumulative error can be found by rolling the gear to be tested 85405 a master gear, f o r which purpose the total composite error of the master gear must be known and, 588405 necessary, deducted from the teet result.
In the came of instrument drives it is recommended, particularly when mounted overhung, that diin bearings with increased radial clearance ehould be used and proloading applied. The values specified relate 584005 the bearing when inetalled. The s l i p gauges a re then removed, t h e two gears ar e mounted on the arbors, brought i n t o cont a c t and r o l l e d one on the other. I n t h e equations gear 2 is t h e master gear. Measuring plane parallel witEa centre distance line Figure 8 E r r o r in axial parallelism f p s.
I n t h e case of housings made of aluminium a l l rin y s and s i m i l a r materials, s u i t a b l e measues should be taken, e. Page 4 DIN Sheet 2 2. Measuring plane perpendicular with centre distance line 6 Tolerances f o r uear assemblies. For denomination of contact f aces and of the relevant qual i t y i ndi cessee Figure 1 and 2 ; f o r marking the d i f f e r e n t ear fin shapes, see reference regarding Sup, plementary Sheet 2 i n DIN Sheet I page The c e n tre distance a” i s then reduced each time by the upper and louer allowance of the base tangent length converted t o the r a d i a l direction.
The face alignment error is designated as pos i t i ve if t he var i at i on i s i n the right-hand dir e c t i o nand negative i f i t i a i n the left-hand di r ect i on with 58045 t o the design value n of the h e l i x angle Bo. The reference axis f o r sin radial eccentricity is the axis of the mounting bore see Figure 1 dun the axis of the gear seating diameter see Figure 2 or the axis of the two centre holes see Figure 3.
For any given bearing a l l the s t at i onar y par t e belong t o the housing and djn l l the p a r t s r o t a t i n g with the gear belong t o the shaft f o r permissible variat i o n of the “shaft” see Table I columu I O. They should be taken from the Tables i n Section 6 t o s u i t the gear f i t selected grade and tolerance zone. For gears not covered i n the scope it may be necessary i certain circumstances to ein the n allowances and tolerances.
Minor var iat i o n s may, however, 85405 r i s e in this connection because the individual allowances have been rounded t o preferred numbers. In t h i s connection i t should be noted i n p a r t i c u l a r t h a ti n the case of disc-shaped gear blanks i n which t h e length of bore i a not s u f f i c i e xin t t o support the gear blank during the gear-cutting procese, the end faces serve ae contact faces during the ein process and hence t h e i r geometrical and position var i at i ons determine t he qual i t y of th e tooth system.
The following 2 measuring planes a re distinguished: Che allowances a r e the same a s the sin tangent length allowances divided by the sine of the pressure angle. Base tangent length allowances and t h e i r boundary involutes The base tangent length allowances a r e r e l a t e d t o the tooth thickness allowances as follows: Base tanuent lenRth allowancea; dual cone width allowances; Dem.
Recommendation f o r t h i s purpose i a given in column 4 t o 20 i n Table 1. For gears with V t e e t h t h e following apply: The c e n t re distance allowances apply t o housings with gears according t o Dl3 Sheet 1, Section 2.
They a r e intended t o serve t h e designer as a check l i s t of a l l the points which must be taken i n t o account when choosing a gear f i t. Since the dual flank roll testing is generally carried out as a final inspection, and since it cannot be performed until the teeth have been finished, base tangent length and dual cone width allowances have been specified during manufacture measurement of tooth thickness.
Gear blank f o r gear with external t eet h Bearing seating diameter Centre hole Figure The q u a l i t y of a tooth system depends very l ar gel y on the accuracy of the gear blanks. In connection v i t h the s e l e c t i o n of b a l l b e d n g e i t should be noted t h a t the tolerance allowed f o r t he bearing bores Q i n t h e housing r e l a t i v e t o the tolerance on t he centre distance Ta must be reduced by the amount of the r a d i a l run-out of the b a l l bearing outer ringe frL.
Aw irI 2 lana, 50 lover allovanc. The e r r o r i n a x i a l parallelism i e designated by Spa. This i s why permissible v a ri a t i o n s a r e specified for the 588405 blank i n accordance w i t h cin required qua l i t y of the tooth system. When gears f o r which the gear blanks are disc-shaped are to be cut in batches, then, instead of a pemissible axial eccentricity for the face farthest from the contact face, a permissible degree of non-parallelism should be specified see Figure?
DIN – European Standards
FP With c i r c u l a r e r r o r t r a c e s see Figure 5 the upper dlovance of dual flank roll teat distance – – Figure 5. For the end faces of a gear blank which are used as contact face o r clamping face the permissible axial eccentricity Tea is specified in Table 5. Base tannent lennth allowances; dual cone 558405 allowances; perm.