Linear Bushing Housing Units
Product name | Linear Bushings with Pillow Blocks/Double Bushings |
Part number | LHSSKW10 |
Features | The compact type is Max. 6mm lower in height (H dimension) and Max. 3mm smaller in width (W dimension) than the Standard Type. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Includes the bushing and the housing
Available sizes
■Linear Bushing Housing Unit (Tall Blocks Double, Compact Type)
Linear Bushing Used | Holder |
Material | Surface Treatment |
Compact | Aluminum Alloy | Clear Anodize |
■Sizes and Dimensions
I.D. (mm) | Overall Length (mm) | Mounting Screw Dia. |
6 | 46 | M4 |
8 | 56 |
10 | 68 | M5 |
12 | 70 |
16 | 84 | M6 |
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Selection Steps
■Linear Bushings with Pillow Blocks Selection Steps
- Determine Application Conditions
- (Load, Operational Pattern, Life hours)
↓
- Temporarily select linear bushing specifications
- (Shaft dia. and length are temporarily selected according to the conditions of use.)
↓
- Basic safety check
-
- ●Basic Static Load Rating
- ●Basic Dynamic Load Rating
- ●Allowable Static Moment
- ●Operating Life
↓
- Considerations Based on Required Performance
- ●Life Variations Due to Temperature Changes
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Accuracy Info
■Accuracy of Linear Bushings with Pillow Blocks
(mm)
I.D. | I.D. Tolerance | Tolerance of Height from Table Top |
6 | 0 -0.010 | ±0.02 |
8 |
10 |
12 |
16 |
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Performance info.
■Speeds / Loads (Load Info.) of Linear Bushings with Pillow Blocks
I.D. (mm) | Basic Load Rating |
Basic Dynamic Load Rating (N) | Basic Static Load Rating (N) |
5 | 167 | 206 |
6 | 206 | 265 |
8 | 265 | 380 |
10 | 372 | 549 |
12 | 412 | 598 |
13 | 510 | 784 |
16 | 775 | 1180 |
20 | 882 | 1370 |
25 | 980 | 1570 |
30 | 1570 | 2740 |
35 | 1670 | 3140 |
40 | 2160 | 4020 |
50 | 3820 | 7940 |
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Technical calculations
■Life of Flanged Linear Bushings
When the linear system is loaded in linear reciprocating motion, scaly damages called flaking appear due to material fatigue as the repeated stress is applied on the rolling elements and the rolling contact surfaces constantly. Total travel distance until the first flaking occurs is called the life of linear system.
Rated life can be calculated with the basic dynamic load rating and the actual load applied on the linear bushings, as shown below.
- L: Rated Life (km)
- fH: Hardness Factor (See Fig.1)
- fT: Temperature Factor (See Fig. 2)
- fC: Contact Factor (See Table-3)
- fW: Load Factor (See table-4)
- C: Basic Dynamic Load Rating (N)
- P: Applicable Load (N)
●Hardness factor (fH)
For liner system applications, sufficient hardness is required for ball contact shafts. Inappropriate hardness causes less allowable load, resulting in shorter life.
Fig.-1 Hardness Factor
●Temperature factor (fT)
When the temperature of linear Bushings exceed 100°C, hardness of blocks and rails will be reduced, causing reduction of life. Please compensate the life rating with temperature factor.
Fig.-2. Temperature factor
●Contact factor (fC)
In general, it is common to use two or more linear bushings on one linear shafts. In these cases, the load on each bushing will vary depending on the machining precision and will not have equally distributed loads. As a result, the allowable load per bushing will vary depending on the number of bushings used on shaft.
Table-3. Contact Factor
Number of bearings installed on one shaft. | Contact factor fC |
1 | 1 |
2 | 0.81 |
3 | 0.72 |
4 | 0.66 |
5 | 0.61 |
●Load Factor (fW)
To calculate load applied to the linear bushings, in addition to the object weight, the inertia force attributed to the motion velocity, moment loads and the variations of each over time must be obtained. However, for reciprocating motion applications, it is difficult to obtain accurate calculation due to the effects of vibrations and shocks. Therefor, use Table2 to simplify the life calculations.
Conditions of Use | fw |
No external shocks or vibrations and speed is low 15m/min or less | 1.0 ~ 1.5 |
No significant shocks or vibration and med. speed 60m/min or less | 1.5 ~ 2.0 |
External shocks and vibrations exist and the speed is high 60m/min or over | 2.0 ~ 3.5 |
Life in hours can be obtained by calculating the travel distance per hour. Then the stroke length and stroke cycles are fixed, use the equation below.
- Lh: Life (hr)
- L: Rated Life (km)
- Ls: Stroke length (m)
- n1: Number of cycles per minute (cpm)
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