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| KHK Stock Gears |
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| | | Stock Gear Selection Methods
KHK Stock Gears Selection Methods
Please refer to this page when you are selecting gears.
There are many ways to select gears depending on which parameters are more important than others such as the strength, size, precision, and speed ratio. As a guide, we have introduced "Selecting Gears Based on Strength" and "Selecting Gears Based on Use."
| Step 2 |
Make a tentative
selection based on the torque load using
the printed version of the KHK catalog or
the Web catalog. |
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| The KHK catalog is used for the tentative selection. |
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| The Web catalog is used for the tentative selection. |
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| Step 3 |
After calculating the required strength using the actual conditions of usage, examine the selection mode in Step 2. |
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| The formal strength calculation can be performed using the various formulas. |
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| If the Web catalog is used, the strength can be easily confirmed. |
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| High
Speed Rotation
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For applications requiring noise and vibration reductions in high speed gear drives, we recommend the ground gears (items with letter G in catalog numbers). Using helical gears will increase the contact ratio, leading to smoother transmission.
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Examples |
MSGA
Ground Spur Gears. JIS N5 Class (Old JIS1).
Overall carburizing
SSG Ground Spur Gears
JIS N7 Class (Old JIS3). Tooth surface induction
hardened |
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| Cost
Performance
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| The more production step, the higher the cost. For example, the SS
series which goes through the steps of - raw material,
turning, gear cutting, and black oxide - has excellent
cost-performance ratio. The Injection Molded Gears
and Sintered Gears are also products with high cost-performance
figures due to mass production. |
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Examples |
SS Steel Spur Gears
DS Injection Molded Spur Gears
LS Sintered Metal Spur Gears
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| High
Strength (compact design)
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Generally, the size of gears is proportional to load capacity. To make the design compact requires the use of alloys (SCM415, SCM440) with heat treating. We recommend catalog parts that start with letter M or K.
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Examples |
MSGA
Ground Spur Gears SCM415 Overall carburizing
KHG Ground Helical Gears SCM440 Tooth surface
induction hardened |
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| Availability
of Secondary Operations
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Please note that heat treated items have hard surfaces. While they gain the strength, they lose the ability of secondary operations to be performed.
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Example |
MSGA
Ground Spur Gears Overall carburizing (Secondary
operations not possible)
SSG Ground Spur Gears
Tooth surface induction hardened (Secondary operations possible except the tooth)
SS Steel Spur Gears
No heat treatment (Secondary operations possible) |
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| Backlash
Considerations
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| In order to minimize the backlash, use high precision parts with ability to adjust center distances. KHK carries, as standard products, items with ability to adjust backlash such as Tapered Racks and Pinions and Duplex Worms and Worm Wheels. |
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Examples |
Tapered
Racks & Pinions KTSCP, STRCPF
Duplex Worms, Worm Wheels KWGDLS, AGDL |
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| High
Reduction Ratios
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We recommend the use of Worm Gear Pair or High Ratio Hypoid Gears. It is also possible to obtain high reduction ratios by forming planetary gear systems using spur and internal gears.
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Examples |
Worm Gear Reduction Ratios
1/10, 1/15, 1/20, 1/30, 1/40, 1/50, 1/60, 1/80, 1/100, 1/120
High Ratio Hypoid Gear Reduction Ratios
1/15, 1/20, 1/30, 1/45, 1/60, 1/90, 1/120, 1/180, 1/200 |
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| Calculating
and Positioning
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It is very convenient to use CP Racks and Pinions for positioning applications. We recommend using ground gears for use in calculating to reduce pitch errors.
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Examples |
SSCPGS CP Ground Spur Pinions
SSCPGS10-15
JIS N7 Class(JIS B1702-1:1998 )
KRGCP CP Ground Racks
KRGCP10-500
KHK R001 Grade 1 |
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| Rust
Prevention
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| Stainless
steel and plastics are suitable where rust
will cause problems, such as in food and chemical
processing equipment. KHK uses these materials in
the manufacture of many kinds of spur, rack, miter,
bevel, screw and worm gears. |
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