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- > No.000181 Reduces the Thrust Load of a Small-size Motor Shaft
No.000181 Reduces the Thrust Load of a Small-size Motor Shaft
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Reducing the thrust load without using a coupling.
Relevant 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: 52100 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 | φ4 | +0.14/ +0.02 | φ14 | -0.095/ -0.365 | 2 | 0/-0.01 | φ4 | +0.2/ +0.02 | φ14 | -0.032/ -0.302 | 1 | +0.05/ -0.05 |
| BA0515 | φ5 | φ15 | φ5 | φ15 | ||||||||
| BA0619 | φ6 | φ19 | -0.110/ -0.440 | φ6 | φ19 | -0.040/ -0.370 | ||||||
| BA0821 | φ8 | +0.175/ +0.025 | φ21 | φ8 | +0.245/ +0.025 | φ21 | ||||||
| BA1024 | φ10 | φ24 | φ10 | φ24 | ||||||||
| BA1226 | φ12 | +0.212/ +0.032 | φ26 | φ12 | +0.302/ +0.032 | φ26 | ||||||
| BA1528 | φ15 | φ28 | φ15 | φ28 | ||||||||
| BA1730 | φ17 | φ30 | φ17 | φ30 | ||||||||
| BA2035 | φ20 | +0.25/ +0.004 | φ35 | -0.120/ -0.510 | φ20 | +0.37/ +0.04 | φ35 | -0.050/ -0.440 | ||||
| BA2542 | φ25 | φ42 | -0.130/ -0.520 | φ25 | φ42 | |||||||
| BA3047 | φ30 | φ47 | φ30 | φ47 | ||||||||
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 | φ4 | φ14 | 5200 | 2.7 | 4.4 | 8 |
| BA0515 | φ5 | φ15 | 5200 | 2.8 | 4.75 | 9.2 |
| BA0619 | φ6 | φ19 | 4700 | 5 | 6.8 | 15.5 |
| BA0821 | φ8 | φ21 | 4500 | 6 | 7.8 | 19.4 |
| BA1024 | φ10 | φ24 | 4200 | 9 | 9.2 | 25.5 |
| BA1226 | φ12 | φ26 | 3700 | 9.9 | 29 | |
| BA1528 | φ15 | φ28 | 3200 | 10 | 11.3 | 36 |
| BA1730 | φ17 | φ30 | 3000 | 12 | 11.9 | 39.5 |
| BA2035 | φ20 | φ35 | 2500 | 15 | 13.1 | 46.5 |
| BA2542 | φ25 | φ42 | 2100 | 21 | 14.7 | 58 |
| BA3047 | φ30 | φ47 | 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 | 1018 Carbon Steel | - | Black Oxide | Set Piece (Copper Alloy) | Set Screw(4137 Alloy Steel) |
| 1045 Carbon Steel Thermal Refined | 22-28HRC | ||||
| 304 Stainless Steel | - | - | Set Screw(304 Stainless Steel ) | ||
■Sizes and Dimensions
| Thread Dia. x Pitch | Retainer O.D. | External Size | Overall thickness | Set Screw Dia. | |
|---|---|---|---|---|---|
| Coarse Thread | Fine Thread | ||||
| M3×0.5 | M3×0.35 | φ4 | □10 | 5.5 | M3 |
| M4×0.7 | M4×0.5 | φ5 | |||
| M5×0.8 | M5×0.5 | φ9 | □11 | ||
| M6×1.0 | M6×0.75 | φ10 | □12 | ||
| M8×1.25 | M8×1.0 | φ13 | □14 | 6.5 | |
| M10×1.5 | M10×1.0 | φ16 | □17 | 8 | M4 |
| M12×1.75 | M12×1.0 | φ17 | □19 | ||
| - | M15×1.0 | φ21 | □22 | 10 | |
| M16×2.0 | - | ||||
| - | M17×1.0 | ||||
| M20×2.5 | M20×1.0 | φ26 | □30 | 13 | |
| M24×3.0 | - | φ33 | □35 | 15 | M5 |
| - | M25×1.5 | ||||
| M30×3.5 | M30×1.5 | φ39 | □40 | 20 | M6 |
| - | M35×1.5 | φ43 | □45 | ||
| M40×1.5 | φ48 | □49 | 25 | ||
| M50×1.5 | φ61 | □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
Economical support.
Available sizes
■Gussets- Tapped Holes, Standard Holes Position, Standard Perpendicularity Type
| Precision Type | Material | Surface Treatment |
|---|---|---|
| Standard Grade (perpendicularity: 0.05/100) ・ Precision Grade (perpendicularity: 0.02/100) | 1018 Carbon Steel | - |
| Black Oxide | ||
| Electroless Nickel Plating | ||
| 5052 Aluminum Alloy | - | |
| Clear Anodize | ||
| Black Anodize | ||
| 304 Stainless Steel | - |
Sizes and Dimensions
| Precision Type | Short side | Long side | Thickness/Tapped Hole Dia. | Tapped Hole Depth | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 30 | 40 | 50 | 60 | 80 | 100 | SS400・SUS304 | 5052 Aluminum Alloy | |||||||||
| t6 | t9 | t12 | t16 | t6 | t10 | t12 | t16 | |||||||||
| Standard Grade (perpendicularity: 0.05/100) ・ Precision Grade (perpendicularity: 0.02/100) | 20 | ○ | ○ | ○ | ○ | ○ | M3 | M3 | Diameter×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 is directly mounted on motors shaft, using wire it powers wire drum that lowers and lifts the workpiece.
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×H1×10 6 /{tan(y1+p1)×d3×q1}×g
=1.432×2.72×10 -5 ×10 6 /{tan(3.58+0.957)×16×1200}×9.8
=0.25N＜6.8kN=c1
⇒No problem
Other Design Consideration
- From smoother motion select ball bearings to support shaft drum not oil free bushing even if its a low speed application.
- Avoid any gap/clearance between motor brackets, thrust bearing and worm gear.
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