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No.000181 Measures for the thrust load of a small-size motor shaft
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Reducing the thrust load without using a coupling
Related Category
Thrust Needle Roller Bearings
| Product name | Thrust Needle Roller Bearings |
|---|---|
| Part number | BA0619 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Suitable item to support thrust load
Available sizes
■Thrust Needle Roller Bearings
Material: JIS-SUJ (Bearing Steel)
| (Name No.) | Thrust Needle Roller with Retainer | Thrust Washer x 2 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hole Dia. | O.D. | Overall Thickness | Hole Dia. | O.D. | Plate Thickness | |||||||
| Tolerance | Tolerance | Tolerance | Tolerance | Tolerance | Tolerance | |||||||
| BA0414 | Ø4 | +0.14 / +0.02 | Ø14 | -0.095 / -0.365 | 2 | 0 / -0.01 | Ø4 | +0.2 / +0.02 | Ø14 | -0.032 / -0.302 | 1 | +0.05 / -0.05 |
| BA0515 | Ø5 | Ø15 | Ø5 | Ø15 | ||||||||
| BA0619 | Ø6 | Ø19 | -0.110 / -0.440 | Ø6 | Ø19 | -0.040 / -0.370 | ||||||
| BA0821 | Ø8 | +0.175 / +0.025 | Ø21 | Ø8 | +0.245 / +0.025 | Ø21 | ||||||
| BA1024 | Ø10 | Ø24 | Ø10 | Ø24 | ||||||||
| BA1226 | Ø12 | +0.212 / +0.032 | Ø26 | Ø12 | +0.302 / +0.032 | Ø26 | ||||||
| BA1528 | Ø15 | Ø28 | Ø15 | Ø28 | ||||||||
| BA1730 | Ø17 | Ø30 | Ø17 | Ø30 | ||||||||
| BA2035 | Ø20 | +0.25/ +0.004 | Ø35 | -0.120 / -0.510 | Ø20 | +0.37 / +0.04 | Ø35 | -0.050 / -0.440 | ||||
| BA2542 | Ø25 | Ø42 | -0.130 / -0.520 | Ø25 | Ø42 | |||||||
| BA3047 | Ø30 | Ø47 | Ø30 | Ø47 | ||||||||
Performance info.
■Load Information of Thrust Needle Roller Bearings
| (Name No.) | Hole Dia. | O.D. | Allowable Rotation Speed (rpm) (Reference) | Mass (g) (Reference) | Basic Dynamic Load Rating Ca kN | Basic Static Load Rating Coa kN |
|---|---|---|---|---|---|---|
| BA0414 | Ø4 | Ø14 | 5200 | 2.7 | 4.4 | 8 |
| BA0515 | Ø5 | Ø15 | 5200 | 2.8 | 4.75 | 9.2 |
| BA0619 | Ø6 | Ø19 | 4700 | 5 | 6.8 | 15.5 |
| BA0821 | Ø8 | Ø21 | 4500 | 6 | 7.8 | 19.4 |
| BA1024 | Ø10 | Ø24 | 4200 | 9 | 9.2 | 25.5 |
| BA1226 | Ø12 | Ø26 | 3700 | 9.9 | 29 | |
| BA1528 | Ø15 | Ø28 | 3200 | 10 | 11.3 | 36 |
| BA1730 | Ø17 | Ø30 | 3000 | 12 | 11.9 | 39.5 |
| BA2035 | Ø20 | Ø35 | 2500 | 15 | 13.1 | 46.5 |
| BA2542 | Ø25 | Ø42 | 2100 | 21 | 14.7 | 58 |
| BA3047 | Ø30 | Ø47 | 1800 | 24 | 16.3 | 70 |
Bearing Lock Nuts
| Product name | Bearing Lock Nuts/Square Type/Coarse Thread |
|---|---|
| Part number | BNGS6 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Compact nut designed exclusively for tightening the bearings
Available sizes
■Bearing Lock Nuts - Square
| Screw Pitch Type | Material | Hardness | Surface Treatment | Accessory | |
|---|---|---|---|---|---|
| Coarse ･ Fine | EN 1.0038 Equiv. | - | Black Oxide | Set Piece (Copper Alloy) | Set Screw (EN 1.7220 Equiv.) |
| EN 1.1191 Equiv. Thermal Refined | 22 ~ 28HRC | ||||
| EN 1.4301 Equiv. | - | - | Set Screw (EN 1.4301 Equiv. ) | ||
■Sizes and Dimensions
| Thread Dia. x Pitch | Retainer O.D. | External Size | Overall thickness | Set Screw Dia. | |
|---|---|---|---|---|---|
| Coarse Thread | Fine Thread | ||||
| M3 x 0.5 | M3 x 0.35 | Ø4 | □10 | 5.5 | M3 |
| M4 x 0.7 | M4 x 0.5 | Ø5 | |||
| M5 x 0.8 | M5 x 0.5 | Ø9 | □11 | ||
| M6 x 1.0 | M6 x 0.75 | Ø10 | □12 | ||
| M8 x 1.25 | M8 x 1.0 | Ø13 | □14 | 6.5 | |
| M10 x 1.5 | M10 x 1.0 | Ø16 | □17 | 8 | M4 |
| M12 x 1.75 | M12 x 1.0 | Ø17 | □19 | ||
| - | M15 x 1.0 | Ø21 | □22 | 10 | |
| M16 x 2.0 | - | ||||
| - | M17 x 1.0 | ||||
| M20 x 2.5 | M20 x 1.0 | Ø26 | □30 | 13 | |
| M24 x 3.0 | - | Ø33 | □35 | 15 | M5 |
| - | M25 x 1.5 | ||||
| M30 x 3.5 | M30 x 1.5 | Ø39 | □40 | 20 | M6 |
| - | M35 x 1.5 | Ø43 | □45 | ||
| M40 x 1.5 | Ø48 | □49 | 25 | ||
| M50 x 1.5 | Ø61 | □63 | |||
Gussets
| Product name | Gussets/Tapped Holes/Standard Holes Position/Standard Perpendicularity Type |
|---|---|
| Part number | RBBW30-30-6 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Best suited for using as an economical reinforcing rib
Available sizes
■Rib - Tapped Hole Fixed Dimensions
| Precision Type | Material | Surface Treatment |
|---|---|---|
| Standard Grade (perpendicularity: 0.05 / 100) ･ Precision Grade (perpendicularity: 0.02 / 100) | EN 1.0038 Equiv. | - |
| Black Oxide | ||
| Electroless Nickel Plating | ||
| EN AW-5052 Equiv. | - | |
| Clear Anodize | ||
| Black Anodize | ||
| EN 1.4301 Equiv. | - |
■Sizes and Dimensions
| Precision Type | Short side | Long side | Thickness / Tapped Hole Dia. | Tapped Hole Depth | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 30 | 40 | 50 | 60 | 80 | 100 | EN 1.0038 Equiv. / EN 1.4301 Equiv. | EN AW-5052 Equiv. | |||||||||
| t6 | t9 | t12 | t16 | t6 | t10 | t12 | t16 | |||||||||
| Standard Grade (perpendicularity: 0.05 / 100) ･ Precision Grade (perpendicularity: 0.02 / 100) | 20 | ○ | ○ | ○ | ○ | ○ | M3 | M3 | Diameter x 1.5 | |||||||
| 30 | ○ | M3 | M6 | M3 | M6 | |||||||||||
| ○ | ○ | ○ | ○ | ○ | M5 | M6 | M5 | M6 | ||||||||
| 40 | ○ | ○ | ○ | ○ | ○ | M5 | M6 | M5 | M6 | |||||||
| M6 | M8 | M6 | M8 | |||||||||||||
| 50 | ○ | ○ | ○ | ○ | M5 | M6 | M5 | M6 | ||||||||
| M6 | M8 | M6 | M8 | |||||||||||||
| 60 | ○ | ○ | ○ | M5 | M6 | M5 | M6 | |||||||||
| M6 | M8 | M6 | M8 | |||||||||||||
| 80 | ○ | ○ | M5 | M6 | M8 | M5 | M6 | M8 | ||||||||
| M6 | M8 | M6 | M8 | |||||||||||||
| 100 | ○ | M5 | M6 | M8 | M5 | M6 | M8 | |||||||||
| M6 | M8 | M6 | M8 | |||||||||||||
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Application Overview
Purpose
- Purpose
- Reducing the thrust load to the motor shaft without using coupling.
- Operation
- Worm gear and wheel are rotated by the motor, and the drum on the shaft wind the wire.
Points for use
- Applicable to thrust load from one direction only.
Target workpiece
- Shape: Block
- Size: W40 x D40 x H25mm
- Weight: 0.3kg
Design Specifications
Operating Conditions or Design Requirements
- Up and down stroke: 30mm
- External size: W123 x D125 x H92mm
Required Performance
- Load: 3N
Selection Criteria for Main Components
- A motor with thrust load of 0.8N is selected to pull up a workpiece of 0.3kg.
Design Evaluation
Verification of main components
- Select the bearing to withstand the load weight.
- Thrust bearing selection
- Conditional values: Diameter of the wire winding part of the drum d1 = 28mm, pitch circle diameter of the worm wheel d2 = 30mm, motor rotational speed z1 = 1200rpm, workpiece mass W = 0.3kg, gravitational acceleration g = 9.8m/s², work movement length l1 = 30mm, friction coefficient on the tooth surface µ = 0.0167, tooth rectangular pressure angle a = 20°, worm gear advance angle y1 = 3.58°, pitch circle diameter of worm gear d3 = 16mm, worm gear rotational speed q1 = 1200mm, basic load rating of thrust bearing c1 = 6.8kN
- Number of revolution necessary for the drum to wind the workpiece n1 is given as follows:
n1 = d1 x π / l1 = 28 x π / 30 = 2.93
Motor rotation time at that time is given by
t1 = d2 x n1 x (60 x z1) = 30 x 2.93 x (60 x 1200) = 4.40t - Net power H1 applied to the worm gear is given by
H1 = W x g x l1 / t1 = 0.3 x 9.8 x 30 / 4.40 = 0.02N = 2.72 x 10-5 PS - Apparent friction angle on the tooth surface p1 is given by
p1 = tan - 1 (µ) = tan - 1 (0.0167) = 0.957° - Axial thrust load F1 of the worm gear is given by
F1 = F2 / tan (y + p) = 1.432 x H1 x 106 / {tan (y1 + p1) x d3 x q1} x g
= 1.432 x 2.72 x 10-5 x 106 / {tan (3.58 + 0.957) x 16 x 1200} x 9.8
= 0.25N < 6.8kN = c1
⇒No problem
Other Design Consideration
- The bearing, instead of bush, is used although operation turns into low speed rotation because of the worm gear and wheel drive.
- Mounting should be conducted so that no gap exists between the motor bracket, bearing, and the worm gear.
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