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BALL SCREW SPLINE SPBF (TORQUE RESISTANT):
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The Ball Screw Spline shaft has a screw thread and a spline groove. The SPBF module consists of a Rotary Ball Screw nut and a Fixed Ball Spline nut (SSPF type). This combination of the ball screw and ball spline on one shaft provides a system which allows a rotary input on the ball screw to drive the module linearly. Available in 3 sizes: SPBF16, SPBF20 & SPBF25. For torque resistant applications where linear, rotary and spiral motion is required, please see SPBR type. |
Rotary Ball Screw Nut:
a) Dimensions (mm)
| Part Number | D1 (h7) |
D2 (H7) |
L1 | P1 | θ | S1 | f1 | Te | D3 (0 -7µm) |
D4 | H1 | B1 | B2 | P2 (PCD) |
d1 |
| SPBF16 | 40 (+0 -25µm) |
32 |
43.5 | 25 | 40º | M4 | 12 | 2 | 52 | 68 | 5 | 27.5 | 9 | 60 | 4.5 |
| SPBF20 | 50 (+0 -25µm) |
39 (+25 0µm) |
54 | 31 | 40º | M5 | 16 | 2 | 62 | 78 | 6 | 34 | 11 | 70 | 4.5 |
| SPBF25 | 58 (+0 -30µm) |
47 |
65 | 38 | 40º | M6 | 19 | 3 | 72 | 92 | 8 | 43 | 12.5 | 81 | 5.5 |
| Part Number | DS |
Lead | Dr |
| SPBF16 | 16 | 16 |
13.4 |
| SPBF20 | 20 | 20 | 17.2 |
| SPBF25 | 25 | 25 |
21.9 |
b) Loads
| Ball Screw | Angular Contact Bearing | Moment of Inertia | Mass | Ball Screw Nut | ||||||
| Load Ratings (kN) |
Load Ratings |
Nut |
Screw Shaft |
Nut |
Shaft |
(Based on Dm.N) | ||||
| Part Number | Ca |
C0a |
Car |
C0ar |
Max rpm | (kg.cm2) | (kg.cm2/mm) | (kg) | (kg/m) | Max rpm |
| SPBF16 | 4.62 | 8.59 | 11.1 | 22.2 | 4000 | 0.60 | 4.43x10-4 | 0.45 | 1.47 | 4,179 |
| SPBF20 | 5.77 | 12.2 | 14.4 | 30.5 | 3200 | 1.75 | 1.12x10-3 | 0.76 | 2.33 | 3,414 |
| SPBF25 | 8.62 | 19.2 | 18.2 | 39.8 | 2800 | 3.86 | 2.74x10-3 | 1.26 | 3.65 | 2,692 |
Flanged Ball Spline Nut (Fixed):
a) Dimensions (mm)
| Part Number | D9 (h6) (+0 -16µm) |
L3 |
D10 |
H3 | P5 PCD |
d3x d4x h | W | Ds |
| SPBF16 | 31 |
50 |
50 | 7 | 40 | 4.5x8x4.4 | 18 | 2 |
| SPBF20 | 35 |
63 (+0 -0.2mm) |
58 | 9 | 45 | 5.5x9.5x5.4 | 22.5 | 2 |
| SPBF25 | 42 |
71 |
65 | 9 | 52 | 5.5x9.5x5.4 | 26.5 | 3 |
b) Loads
| Ball Spline | ||||||
| Torque Rating (Nm) | Load Rating (kN) | (kg.cm2) | ||||
| CT | C0T | C | C0 | Max Static Moment (Nm) | Moment of Inertia | Mass of Nut (kg) |
| 60 | 110 | 6.12 | 11.2 | 46 | 0.52 | 0.2 |
| 105 | 194 | 8.9 | 16.3 | 110 | 1.11 | 0.33 |
| 189 | 346 | 12.8 | 23.4 | 171 | 2.01 | 0.45 |
Motion Pattern:
Motion |
Input |
Output |
|
Ball screw nut |
Direction | Travel distance (linear) |
|
 |
N1 (normal) |
1 |
L= N1.R (up) |
-N1 (reverse) |
2 |
L= -N1.R (down) |
|
| L = travel distance (mm), R = ball screw lead, N1 = number of ball screw nut rotation | |||