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No.000239 W reversing mechanism
56
56
Angled rack and pinion mechanism used to reverse a workpiece.
Related Category
Gear Racks
| Product name | Gear Racks/Pressure Angle 20Deg./Configurable L Dimension |
|---|---|
| Part number | RGEAL1.5ST-100-A5-B45-C45 |
| Features | This enables to switch between rotating motion and linear motion. Length and mounting hole machining can be specified. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Selected to achieve simultaneous rotation.
Risk info.
Wear due to lack of teeth surface hardening.
Available sizes
■Rack Gears (One End Machined)
| Material | Surface Treatment |
|---|---|
| EN 1.1191 Equiv. | Black Oxide |
| Free-Cutting Brass Bar | - |
| EN 1.4301 Equiv. | - |
| MC Nylon | - |
■Sizes and Dimensions
| Material | Module | Tooth width | Overall Length 1mm Increments |
|---|---|---|---|
| EN 1.1191 Equiv. | 1.0 | 10 | 20-400 |
| 1.5 | 15 | ||
| 2.0 | 20 | ||
| 2.5 | 25 | ||
| 3.0 | 30 | ||
| Free-Cutting Brass Bar | 0.5 | 3 | 20-280 |
| 0.8 | 4 | ||
| EN 1.4301 Equiv. | 0.5 | 3 | 20-280 |
| 0.8 | 4 | ||
| 1.0 | 10 | 20-480 | |
| 1.5 | 15 | ||
| 2.0 | 20 | ||
| 2.5 | 25 | ||
| 3.0 | 30 | ||
| MC Nylon | 0.5 | 3 | 20-280 |
| 0.8 | 4 | ||
| 1.0 | 10 | 20-480 |
Accuracy Info
■Rack Gear (Accuracy Information)
Accuracy: Accumulated Pitch Error (µm)
| Module | Overall Length | ||||
|---|---|---|---|---|---|
| 100. or Less | 101-300 | 301-500 | 501-1000 | 1001-1980 | |
| 0.5-1.5 | 54(76) | 65(92) | 72(101) | 100(117) | 99(139) |
| 2.0-3.0 | 62(86) | 73(102) | 80(112) | 91(128) | 105(148) |
Induction Hardened Spur Gears
| Product name | Spur Gears/Induction Hardened/Pressure Angle 20Deg. |
|---|---|
| Part number | GEAHBH1.5-32-15-A-20 |
| Features | Gears with hardened teeth which provides excellent strength, abrasion resistance and high precision |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Reduce wear to gear teeth.
Available sizes
■Induction Hardened Spur Gears (Ground)
| Material | Surface Treatment | Hardness | Accessory |
|---|---|---|---|
| EN 1.1191 Equiv. | Black Oxide Coating | Tooth Induction Hardened 51 - 55 HRC (Depth 1mm or more) | Set screw (EN 1.7220 Equiv. Black Oxide Coating) |
■Sizes and Dimensions
| Module | Number of Teeth | Shaft Bore DIA. (1mm increment) | |
|---|---|---|---|
| Round Hole, Round Hole + Tap | Keyway, Keyway + Tap | ||
| 1.0 | 18 | 6-10 | - |
| 20 | 6-11 | 8 ･ 10 | |
| 22 | 8-14 | 8-12 | |
| 24 | |||
| 25 | |||
| 26 | |||
| 28 | |||
| 30 | 10-17 | 10-15 | |
| 32 | |||
| 35 | |||
| 36 | |||
| 40 | 10-21 | 10-18 | |
| 45 | |||
| 48 | |||
| 50 | 12-24 | 12-18 | |
| 60 | 12-28 | 12-25 | |
| 70 | |||
| 80 | 15-35 | 15-30 | |
| 100 | |||
| 1.5 | 15 | 10-12 | 10 |
| 16 | 10-13 | 10 ･ 11 | |
| 18 | 10-15 | 10-13 | |
| 20 | 10-16 | 10-14 | |
| 24 | 12-19 | 12-17 | |
| 25 | 12-21 | 12-18 | |
| 26 | 12-22 | 12-19 | |
| 28 | 15-25 | 15-19 | |
| 30 | 15-26 | 15-23 | |
| 32 | 15-28 | 15-24 | |
| 35 | 15-29 | 15-26 | |
| 36 | 15-31 | 15-28 | |
| 40 | 15-35 | 15-31 | |
| 45 | 18-35 | 18-31 | |
| 48 | |||
| 50 | 18-42 | 18-38 | |
| 60 | 20-42 | 20-38 | |
| 70 | |||
| Gear specification | Shaft Bore Specs. | |||
|---|---|---|---|---|
| Round Hole | Round Hole + Tap | Keyway | Keyway + Tap | |
| No hub | ○ | ○ | ||
| With Hub | ○ | ○ | ○ | |
Accuracy Info
■Accuracy of Spur Gear.
Gear accuracy: Previous JIS B 1702 4 Class (New JIS B 1702-1 - 8 class equivalent).
Shaft Bore Dia. Tolerance: H7.
Thrust Ball Bearings
| Product name | Thrust Ball Bearings |
|---|---|
| Part number | B51102 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Selected for supporting thrust load of workpiece and components.
Available sizes
■Thrust Ball Bearing
| Material | |
|---|---|
| Steel Type | EN 1.3505 Equiv. |
| Stainless Steel Type | EN 1.4125 Equiv. |
■Sizes and Dimensions
| I.D. | Track Plate O.D. | Track Plate I.D. | Thickness |
|---|---|---|---|
| 10 | 24 | 11 | 9 |
| 26 | 12 | 11 | |
| 12 | 26 | 13 | 9 |
| 28 | 14 | 11 | |
| 15 | 28 | 16 | 9 |
| 32 | 17 | 12 | |
| 17 | 30 | 18 | 9 |
| 35 | 19 | 12 | |
| 20 | 35 | 21 | 10 |
| 40 | 22 | 14 | |
| 25 | 42 | 26 | 11 |
| 47 | 27 | 15 | |
| 30 | 32 | 11 | |
| 52 | 32 | 16 |
Performance info.
■Load information of the thrust ball bearings
| I.D. | Track Plate O.D. | Basic Load Rating | Allowable Rotational Speed rpm | |||
|---|---|---|---|---|---|---|
| Steel Type | Stainless Steel Type | |||||
| Ca (Dynamic) kN | Coa (Static) kN | Ca (Dynamic) kN | Coa (Static) kN | |||
| 10 | 24 | 10.1 | 14 | 5 | 6.96 | 6700 |
| 26 | 12.8 | 17.1 | - | - | 6000 | |
| 12 | 26 | 10.4 | 15.4 | 5.15 | 7.7 | 6700 |
| 28 | 13.3 | 19 | - | - | 5600 | |
| 15 | 28 | 10.6 | 16.8 | 5.25 | 8.38 | 6300 |
| 32 | 16.7 | 24.8 | - | - | 5000 | |
| 17 | 30 | 11.4 | 19.5 | 5.39 | 9.07 | 6000 |
| 35 | 17.3 | 27.3 | - | - | 4800 | |
| 20 | 35 | 15.1 | 26.6 | 7.11 | 12.36 | 5300 |
| 40 | 22.5 | 37.5 | - | - | 4300 | |
| 25 | 42 | 19.7 | 37 | 9.76 | 18.63 | 4800 |
| 47 | 28 | 50.5 | - | - | 3800 | |
| 30 | 20.6 | 42 | 10.2 | 21.08 | 4300 | |
| 52 | 29.5 | 58 | - | - | 3400 | |
IDEA NOTE Radial + thrust
Workpiece positioning and rotation are supported by a mechanism combining a radial bearing and a thrust bearing.
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Application Overview
Purpose
- One axis of the linear rack section is driven by a cylinder, the pinions on the other axis are then rotated simultaneously to reverse them to any desired angle. (90° in the example).
Points for use
- The workpiece is transferred in and out by the up and down motion of the chucking mechanism on the external unit.
- The stroke is controlled by both the sensor of the cylinder, and a mechanical stopper to ensure the precise workpiece angle.
Target workpiece
- Material: Resin
- External Shape:Ø9 x W41mm
- Mass: 3g
Features
Operating specifications ･ Dimensions
- Workpiece rotation angle: 90°
- Pinion Gear: m1.5, z32, P.C.D. 48mm
- Required Cylinder Stroke: 37.7mm
- System External Shape: W 390 x D 300 x H 106mm
Required accuracy ･ Load
- Cylinder Thrust: 6.83N or more
Selection criteria of main components
- Cylinder
- Adopted thin type cylinder for space saving.
- Pinion Gear
- A pinion gear with a tap hole is used affixed to workpiece jig, so the jig can be rotated.
Design point
Calculation processes for the main components
- Whether the cylinder thrust force can handle the slide-way load and rotation section load is verified below.
- Thrust of cylinder (Ø20mm, ST 50mm)
- Condition value: Slide way total weight m1 = 1.714kg, linear guide friction coefficient μ1 = 0.005 (from catalog), rotating section total weight m2 = 0.688kg, conversion factor to slide motion of rotating section μ2 = 1 (assumed as a slide with a friction coefficient of 1 for safe side), operating pressure of cylinder: 0.2MPa
- Slide way load: F1 = m1 x g x μ1, thus, F1 = 1.714 x 9.8 x 0.005 = 0.084N
- Rotating section load: F2 = m2 x g x μ2, thus, F2 = 0.688 x 9.8 x 1 = 6.742N
- Total load: F = F1 + F2 = 0.084 + 6.742 = 6.83N
- Pull side thrust of cylinder: F0 = 47N(from catalog)
- Safety factor: F0/F = 47/6.83 ≈ 6.88
Structure elaboration and design key points.
- This system is effective for a corner section, that requires the reversing of multiple parts on an automated line in single file.
- The workpiece table has a slotted hole in the rotated direction in order to enable the adjustment of the workpiece position during rotation.
- Installing a sensor and mechanical stopper in parallel enables precise positioning and angle adjustment of the workpiece. It also reduces the generation of moments by stopping the transmission of cylinder thrust prior to hitting the mechanical stopper.
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