ISO 5288:2017 同期ベルトドライブ—用語, 語彙 | ページ 6

3.2.1.1

synchronous belt

belt with transverse teeth of rectangular or curvilinear cross-section extending from the base at regularly spaced intervals

Note 1 to entry: Consult synchronous belt dimensional standards for the full details of belt profiles.

3.2.1.2

tooth pitch

P_b

linear distance between the axes of two consecutive teeth in a section of belt loaded to the prescribed measuring force

Note 1 to entry: See Figure 4.

Figure 4

3.2.1.3

pitch line

circumferential line in the belt which keeps the same length when the belt is bent perpendicularly to its base

Note 1 to entry: See Figure 5.

Figure 5

3.2.1.4

pitch line differential

a

<belts> radial distance between the pitch line (3.2.1.3) and the root line (3.2.5.3)

Note 1 to entry: See Figure 6.

Figure 6

3.2.1.5

belt pitch length

L_p

length of the pitch line (3.2.1.3) of a belt

3.2.1.6

width

b_s

transverse dimension of the back of the belt

Note 1 to entry: See Figure 7.

Figure 7

3.2.1.7

height

h_s/h_d

total height of a single-sided or double-sided belt

Note 1 to entry: See Figure 8.

Figure 8

a) Single-sided belt

b) Double-sided belt

3.2.2.1

trapezoidal profile

transverse tooth (3.2.5.1) profile formed by a tooth flank and tip with only straight lines

Note 1 to entry: See Figure 9.

Figure 9

3.2.2.2

curvilinear profile

transverse tooth (3.2.5.1) profile formed by a tooth flank or tip with curved lines

Note 1 to entry: See Figure 10.

Figure 10

3.2.3.1

endless synchronous belt

closed synchronous belt (3.2.1.1)

Note 1 to entry: See Figure 11.

Figure 11

3.2.3.2

open synchronous belt

synchronous belt (3.2.1.1) with two ends

Note 1 to entry: See Figure 12.

Figure 12

3.2.4.1

single-sided synchronous belt

synchronous belt (3.2.1.1) with teeth located inside of the pitch line (3.2.1.3) at regularly spaced intervals

Note 1 to entry: See Figure 13.

Figure 13

3.2.4.2

double-sided synchronous belt

synchronous belt (3.2.1.1) with teeth located on both sides of the pitch line (3.2.1.3) at regularly spaced intervals

Note 1 to entry: See Figure 14.

Figure 14

a) Staggered double-sided synchronous belt

b) Symmetrical double-sided synchronous belt

3.2.5.1

tooth

generally transverse element protruding from the root of the belt which have the profile necessary to mesh with the grooves (3.3.2.1) in a synchronous pulley (3.3.1.1)

Note 1 to entry: See Figure 15.

Figure 15

3.2.5.2

tip line

line joining the tips of the belt teeth

Note 1 to entry: See Figure 16.

Figure 16

3.2.5.3

root line

line joining the roots between the belt teeth

Note 1 to entry: See Figure 17.

Figure 17

3.2.5.4

tooth height

h_t

distance between the tip line (3.2.5.2) and the root line (3.2.5.3)

Note 1 to entry: See Figure 18.

Figure 18

3.2.5.5

flank

area defined by the width (3.2.1.6) of the belt tooth (3.2.5.1) and the portion of the tooth section contained between the tooth tip radius and the tooth root radius or, if there is no tooth tip radius, contained between the tip line (3.2.5.2) and the tooth root radius

Note 1 to entry: See Figure 19.

Figure 19

a)

b)

3.2.5.6

working flank

<teeth> flank (3.2.5.5) of a belt tooth (3.2.5.1) in contact with the pulley groove flank when it is transmitting power

Note 1 to entry: See Figure 20.

Figure 20

3.2.5.7

non-working flank

<teeth> flank (3.2.5.5) of the tooth (3.2.5.1) opposite the working flank (3.2.5.6)

Note 1 to entry: See Figure 21.

Figure 21

3.2.5.8

radius at tooth tip

r_a

radius of a generally curved section of a belt tooth (3.2.5.1) that connects the tooth flank (3.2.5.5) with the tip line (3.2.5.2)

Note 1 to entry: See Figure 22.

Figure 22

3.2.5.9

radius at tooth root

r_r

radius of a curve connecting the tooth (3.2.5.1) flank (3.2.5.5) with the root line (3.2.5.3)

Note 1 to entry: See Figure 23.

Figure 23

3.2.5.10

width at tooth root

S

linear distance between the theoretical points of intersection of the tooth (3.2.5.1) flanks (3.2.5.5) with the root line (3.2.5.3) when the belt is straight

Note 1 to entry: See Figure 24.

Figure 24

3.2.5.11

tooth angle

2β

included angle between the flanks (3.2.5.5) of the belt tooth (3.2.5.1)

Note 1 to entry: See Figure 25.

Figure 25

3.3.1.1

synchronous pulley

pulley with generally transverse grooves (3.3.2.1) equally spaced around its circumference

Note 1 to entry: See Figure 26.

Figure 26

3.3.1.2

pitch reference cylinder

imaginary cylindrical surface, coaxial to a pulley, located at the point at which the circular pitch of the pulley is equal to the pitch of the belt it is used with

Note 1 to entry: See Figure 27.

Figure 27

3.3.1.3

pitch circle

section of a pitch reference cylinder (3.3.1.2) with a plane perpendicular to the axis of the pulley

Note 1 to entry: See Figure 28.

Figure 28

3.3.1.4

pitch diameter

d

diameter of the pitch circle (3.3.1.3)

Note 1 to entry: See Figure 29.

Figure 29

3.3.1.5

outside diameter

d_o

diameter of the tip circle (3.3.2.3)

Note 1 to entry: See Figure 30.

Figure 30

3.3.1.6

pitch line differential

a

<pulleys> radial distance between the pitch circle (3.3.1.3) and the tip circle (3.3.2.3)

Note 1 to entry: See Figure 31.

Figure 31

3.3.1.7

pitch

P_b

length of arc on the pitch circle (3.3.1.3) contained between the axes of two consecutive grooves (3.3.2.1)

Note 1 to entry: See Figure 32.

Figure 32

3.3.1.8

minimum pulley width

b_f

b′_f

b′′_f

smallest lateral distance across the face of a pulley or between the flanges (3.3.1.11) of a flanged pulley or between the face of pulley and the flanges of a flanged pulley that can be used for a stated belt width (3.2.1.6)

Note 1 to entry: See Figure 33.

Figure 33

a) Flanged pulley

b) Unflanged pulley

3.3.1.9

measuring pulley

pulley specifically machined or selected to permit precise length measurement of a synchronous belt (3.2.1.1)

3.3.1.10

measuring pulley groove clearance

C_m

shortest distance between the non-working flanks (3.2.5.7) of belt teeth and the measuring pulley (3.3.1.9) grooves (3.3.2.1) , and between the belt tooth (3.2.5.1) tip and the pulley groove root, when the working flanks (3.2.5.6) of the pulley and belt are in contact

Note 1 to entry: See Figure 34.

Figure 34

Key

1	belt
2	pulley

3.3.1.11

flange

flared, annular ring secured to (usually both) extremities of the working face of a pulley to guide the belt and operate within the working face of a pulley

3.3.2.1

groove

equally spaced, generally transverse indentation with which the belt teeth mesh to provide a transfer of force between the belt and the pulley

Note 1 to entry: See Figure 35.

Figure 35

3.3.2.2

tip cylinder

surface coaxial with the pulley containing the crests between the grooves (3.3.2.1)

Note 1 to entry: See Figure 36.

Figure 36

3.3.2.3

tip circle

section of the tip cylinder (3.3.2.2) where the plane is perpendicular to the axis of the pulley

Note 1 to entry: See Figure 37.

Figure 37

3.3.2.4

root cylinder

surface coaxial with the pulley containing the centre of bottom of the grooves (3.3.2.1)

Note 1 to entry: See Figure 38.

Figure 38

3.3.2.5

root circle

section of the root cylinder (3.3.2.4) where the plane is perpendicular to the axis of the pulley

Note 1 to entry: See Figure 39.

Figure 39

3.3.2.6

groove depth

h_g

radial distance between the tip circle (3.3.2.3) and the root circle (3.3.2.5)

Note 1 to entry: See Figure 40.

Figure 40

3.3.2.7

flank

area defined by the width (3.2.1.6) of the pulley and the portion of a pulley groove contained between the groove crest radius and the groove root radius or, if there is no groove root radius, contained between the groove crest radius and the root circle (3.3.2.5)

Note 1 to entry: See Figure 41.

Figure 41

3.3.2.8

working flank

<grooves> flank (3.2.5.5) of the pulley in contact with the belt tooth (3.2.5.1) flank when the belt is transmitting power

Note 1 to entry: See Figure 42.

Figure 42

3.3.2.9

non-working flank

<grooves> flank (3.2.5.5) of the pulley groove opposite the working flank (3.3.2.8)

Note 1 to entry: See Figure 43.

Figure 43

3.3.2.10

radius at the groove crest

r_t

radius of a curve connecting the groove flank (3.2.5.5) with the tip circle (3.3.2.3)

Note 1 to entry: See Figure 44.

Figure 44

3.3.2.11

radius at the groove root

r_b

radius of a curve connecting the groove flank (3.2.5.5) with the root circle (3.3.2.5)

Note 1 to entry: See Figure 45.

Figure 45

3.3.2.12

width at groove root

b_w

linear distance between the theoretical points of intersection of the groove flanks (3.2.5.5) with the root circle (3.3.2.5)

Note 1 to entry: See Figure 46.

Figure 46

3.3.2.13

width at groove crest

b_r

linear distance between the theoretical points of intersection of the groove flanks (3.2.5.5) with the tip circle (3.3.2.3)

Note 1 to entry: See Figure 47.

Figure 47

3.3.2.14

groove angle

2ϕ

included angle between the flanks (3.2.5.5) of the groove

Note 1 to entry: See Figure 48.

Figure 48

3.3.3.1

rack form

definitive tooth (3.2.5.1) form used as a datum for defining the profiles for pulley groove-cutting tools

Note 1 to entry: See Figure 49.

Figure 49

3.3.3.2

reference rack

rack where the profile is used as the base of a standardized system of pulleys having the same generating rack

3.3.3.3

reference rack pitch line

line with reference to which the pitch (3.3.1.7) of the rack teeth is defined

Note 1 to entry: See Figure 50.

Figure 50

3.3.3.4

reference rack root line

line joining the roots between the teeth of a rack

Note 1 to entry: See Figure 51.

Figure 51

3.3.3.5

reference rack tip line

line joining the tips of the teeth of a rack

Note 1 to entry: See Figure 52.

Figure 52

3.3.3.6

reference rack flank

portion of the rack tooth (3.2.5.1) contained between the rack tooth tip radius and the tooth root radius or, if there is no rack tooth tip radius, the area contained between the rack tip line (3.2.5.2) and the tooth root radius

Note 1 to entry: See Figure 53.

Figure 53

3.3.3.7

reference rack pitch line location

a

distance between the pitch line (3.2.1.3) and the root line (3.2.5.3) of the rack

Note 1 to entry: See Figure 54.

Figure 54

3.3.3.8

reference rack pitch

P_b

linear distance between the centre of two adjacent teeth on the rack

Note 1 to entry: See Figure 55.

Figure 55

3.3.3.9

reference rack tooth angle

2A

included angle between the flanks (3.2.5.5) of the tooth (3.2.5.1) of the rack

Note 1 to entry: See Figure 56.

Figure 56

3.3.3.10

reference rack tooth height

h_r

distance between the tip line (3.2.5.2) and the root line (3.2.5.3) of the rack

Note 1 to entry: See Figure 57.

Figure 57

3.3.3.11

reference rack width at tooth tip

b_g

linear distance between the theoretical points of intersection of the tooth (3.2.5.1) flanks (3.2.5.5) with the tip line (3.2.5.2) of the rack

Note 1 to entry: See Figure 58.

Figure 58

3.3.3.12

reference rack width at tooth root

b_t

linear distance between the theoretical points of intersection of the tooth (3.2.5.1) flanks (3.2.5.5) with the root line (3.2.5.3) of the rack

Note 1 to entry: See Figure 59.

Figure 59

3.3.3.13

reference rack radius at tooth tip

r₁

radius of a curve connecting the tooth (3.2.5.1) flank (3.2.5.5) with the tip line (3.2.5.2) of the rack

Note 1 to entry: See Figure 60.

Figure 60

3.3.3.14

reference rack radius at tooth root

r₂

radius of a curve connecting the tooth (3.2.5.1) flank (3.2.5.5) with the root line (3.2.5.3) of the rack

Note 1 to entry: See Figure 61.

Figure 61