city-el

City-EL axle dimensions

With measurement photographs and references to technical drawings.

Table of contents:

• Axle
  • Distance between main bearings
• Clutch (right) side
  • Axle diameter
  • Bearing reduction
    • diameter
    • length
    • length without the thread
  • Centering hole
  • Chamfer
  • Clutch key
    • width
    • height
    • thickness
  • Thread
    • diameter
    • inner diameter
    • pitch
    • length
    • undercut diameter
    • undercut length
• Wheel spline (left) side
  • Axle diameter
  • Bearing reduction
    • diameter
    • length
    • length without the thread
  • Spline
    • inner diameter
    • outer diameter
    • length
    • straight segment length
  • Chamfer
  • Thread
    • diameter
    • inner diameter
    • pitch
    • length
    • undercut diameter
    • undercut length
• Motor keyways
  • Thrige
    • width
    • height
    • depth
  • Perm
    • Left keyway
      • distance to bearing
      • width
      • height
      • depth
    • Right keyway
      • width
      • height
      • depth

Axle

length: 1041 mm drawing: 1039.5 mm

Distance between main bearings

• measurements: 1041 - 107 - 100 = 834 mm

• drawing: 1039.5 - 106.5 - 100 = 833 mm

Clutch (right) side

Axle diameter

25 mm

drawing

Bearing reduction

diameter

20 mm drawing

length

107 mm drawing: 106.5 mm

length without the thread

• measurements: 107 - 20.4 = 86.6 mm

• drawing: 106.5 - 20 = 86.5 mm

Centering hole

outer diameter: 5 mm

drawing: 3.35 mm

Chamfer

inner diameter: 13.4 mm

Clutch key

width

9.9 mm drawing: 29 - 20 = 9 mm

height

12 mm

thickness

15.9 mm drawing: 16 mm

Thread

diameter

16 mm drawing

inner diameter

14.4 mm

pitch

12 / 8 = 1.5 mm drawing

length

20.4 mm drawing: 20 mm

undercut diameter

12.9 mm

undercut length

2 mm

Wheel spline (left) side

Axle diameter

24.8 mm drawing: 25 mm

Bearing reduction

diameter

19.9 mm drawing: 20 mm

length

100 mm drawing

length without the thread

• measurements: 100 - 23.55 = 76.45 mm

• drawing: 100 - 24.5 = 75.5 mm

Spline

inner diameter

16.4 mm drawing: 16.3 mm

outer diameter

19.7 mm

• axle drawing: 20 mm
• spline drawing: 19.55 mm with a suggestion to increase to 20 mm

length

55.5 mm

straight segment length

48.7 mm drawing: 70 - 24.5 = 45.5 mm

Chamfer

inner diameter: 13.4 mm

Thread

diameter

16 mm drawing

inner diameter

14.35 mm

pitch

16.5 / 11 = 1.5 mm drawing

length

23.55 mm drawing: 24.5 mm

undercut diameter

12.9 mm

undercut length

2 mm

Motor keyways

Distance between right Perm keyway and the Thrige keyway: 20.1 mm

According to my mesurements, the distance between the thrige keyway and the left perm keyway is 123.6 + 36 + 19.9 = 179.5 mm

According to the drawing, it’s 359.5 - 159.5 - 22 = 178 mm

Thrige

width

44.8 mm drawing: 45 mm

height

7.75 mm drawing: 8 mm

depth

4.4 mm drawing: 4 mm

Perm

distance between left and right keyways: 123.6 mm

Left keyway

distance to bearing

60 mm drawing: 159.5 - 100 = 59.5 mm

width

19.9 mm drawing: 22 mm

height

5.9 mm drawing: 6 mm

depth

3.3 mm drawing: 4.5 mm

Right keyway

This keyway seems to have gotten added to facilitate mounting the Perm motor the other way around so that it rotates in its design direction when driving forward (see this elektroauto-forum post).

width

36 mm

height

6 mm

depth

3.55 mm