Tsubaki Products

Technical Data Reducers Gear Reducer for Servo Motors TERVO Technical Data

Moment of Inertia on Input Shaft (Hypoid motor/Helical gear head )

Hypoid gear head HMTK Type

Model No.	Reduction ratio	Moment of Inertia ×10^-4kg･m² {GD²}{×10^-4kgf･m²}
HMTK0220H	5	0.87 {3.46}
	10	0.81 {3.25}
	15	0.80 {3.19}
	20	0.79 {3.17}
	25	0.79 {3.15}
	30	0.79 {3.15}
	40	0.79 {3.14}
	50	0.79 {3.14}
	60	0.78 {3.14}
HMTK0230H	80	0.73 {2.90}
	100	0.72 {2.90}
	120	0.72 {2.89}
	160	0.72 {2.89}
	200	0.72 {2.89}
HMTK0430H	5	1.05 {4.20}
	10	0.98 {3.90}
	15	0.94 {3.74}
	20	0.92 {3.68}
	25	0.91 {3.64}
	30	0.91 {3.63}
	40	0.92 {3.66}
	50	0.91 {3.65}
HMTK0435H ※	60	0.81 {3.26}
	80	0.81 {3.24}
	100	0.81 {3.23}
	120	0.80 {3.21}
	160	0.80 {3.21}
	200	0.80 {3.21}
HMTK0735H ※	5	3.17 {12.68}
	10	2.74 {11.0}
	15	2.64 {10.57}
	20	2.60 {10.42}
	25	2.58 {10.32}
	30	2.57 {10.3}
	40	2.59 {10.37}
	50	2.58 {10.32}
HMTK0745H	60	2.32 {9.27}
	80	2.31 {9.23}
	100	2.30 {9.21}
	120	2.28 {9.12}
	160	2.28 {9.11}
	200	2.28 {9.11}
HMTK1545H	5	6.55 {26.2}
	10	5.60 {22.4}
	15	5.38 {21.5}
	20	5.28 {21.1}
	25	5.22 {20.9}
	30	5.18 {20.7}
	40	5.27 {21.1}
	50	5.25 {21.0}
	60	5.22 {20.9}
	80	5.21 {20.8}
HMTK1555H	100	5.77 {23.1}
	120	5.69 {22.7}
	160	5.68 {22.7}
	200	5.67 {22.7}
HMTK2245H	5	17.7 {70.9}
	10	16.8 {67.2}
	15	16.6 {66.3}
	20	16.5 {65.8}
	25	16.7 {66.8}
	30	16.5 {66.0}
	40	16.5 {65.8}
	50	16.4 {65.6}
	60	16.4 {65.5}
HMTK2255H	80	17.1 {68.2}
	100	17.0 {68.0}
	120	17.0 {67.8}
HMTK3755H	5	42.3 {169}
	10	39.1 {156}
	15	38.2 {153}
	20	37.7 {151}
	25	38.9 {156}
	30	37.8 {151}
	40	37.7 {151}
	50	37.6 {151}
	60	37.3 {149}
HMTK5555H	5	42.3 {169}
	10	39.1 {156}
	15	38.2 {153}
	20	37.7 {151}
	25	38.9 {156}
	30	37.8 {151}
	40	37.7 {151}
HMTK0222U	5	0.88 {3.50}
	10	0.82 {3.26}
	15	0.80 {3.19}
	20	0.79 {3.17}
	25	0.79 {3.15}
	30	0.79 {3.15}
	40	0.79 {3.14}
	50	0.79 {3.14}
	60	0.78 {3.14}
HMTK0228U	80	0.73 {2.90}
	100	0.72 {2.90}
	120	0.72 {2.89}
	160	0.72 {2.89}
	200	0.72 {2.89}
HMTK0428U	5	1.05 {4.20}
	10	0.99 {3.97}
	15	0.94 {3.77}
	20	0.92 {3.70}
	25	0.91 {3.65}
	30	0.91 {3.63}
	40	0.92 {3.67}
	50	0.91 {3.65}
HMTK0438U ※	60	0.82 {3.26}
	80	0.81 {3.24}
	100	0.81 {3.23}
	120	0.80 {3.22}
	160	0.80 {3.21}
	200	0.80 {3.21}
HMTK0738U ※	5	3.33 {13.3}
	10	2.78 {11.1}
	15	2.66 {10.7}
	20	2.61 {10.5}
	25	2.59 {10.4}
	30	2.58 {10.3}
	40	2.60 {10.4}
	50	2.58 {10.3}
HMTK0742U	60	2.32 {9.28}
	80	2.31 {9.24}
	100	2.30 {9.21}
	120	2.28 {9.12}
	160	2.28 {9.11}
	200	2.28 {9.11}
HMTK1542U	5	6.95 {27.8}
	10	5.70 {22.8}
	15	5.43 {21.7}
	20	5.30 {21.2}
	25	5.24 {21.0}
	30	5.19 {20.8}
	40	5.28 {21.1}
	50	5.25 {21.0}
	60	5.22 {20.9}
	80	5.21 {20.9}
HMTK1550U	100	5.80 {23.2}
	120	5.69 {22.8}
	160	5.68 {22.7}
	200	5.67 {22.7}
HMTK2245U	5	18.1 {72.5}
	10	16.9 {67.6}
	15	16.6 {66.5}
	20	16.5 {66.0}
	25	16.7 {66.9}
	30	16.5 {66.0}
	40	16.5 {65.9}
	50	16.4 {65.6}
	60	16.4 {65.5}
HMTK2255U	80	17.1 {68.2}
	100	17.0 {68.0}
	120	17.0 {67.9}
HMTK3750U	5	43.1 {172}
	10	39.3 {157}
	15	38.3 {153}
	20	37.8 {151}
	25	38.9 {156}
	30	37.9 {151}
	40	37.7 {151}
	50	37.7 {151}
	60	37.4 {149}
HMTK5550U	5	43.1 {172}
	10	39.3 {157}
	15	38.3 {153}
	20	37.8 {151}
	25	38.9 {156}
	30	37.9 {151}
	40	37.7 {151}

Helical gear head GMTK Type

Model No.	Reduction ratio	Actual Reduction Ratio	Moment of Inertia ×10^-4kg･m² {GD²}{×10^-4kgf･m²}
GMTK0218	5	5.031	0.741 {2.97}
	10	9.779	0.714 {2.86}
	15	14.800	0.709 {2.84}
	20	19.821	0.707 {2.83}
	25	24.843	0.707 {2.83}
GMTK0224	30	29.464	0.713 {2.85}
	40	39.030	0.706 {2.82}
	50	49.407	0.706 {2.82}
	60	59.417	0.705 {2.82}
	75	72.286	0.705 {2.82}
GMTK0228	100	97.785	0.709 {2.83}
	120	120.653	0.709 {2.83}
	165	160.136	0.708 {2.83}
	200	194.775	0.708 {2.83}
GMTK0424	5	4.950	0.815 {3.26}
	10	10.313	0.783 {3.13}
	15	15.125	0.770 {3.08}
	20	19.388	0.766 {3.06}
	25	24.750	0.765 {3.06}
GMTK0428	30	30.875	0.777 {3.11}
	40	40.519	0.761 {3.04}
	50	50.909	0.760 {3.04}
	60	60.000	0.760 {3.04}
	75	73.247	0.759 {3.03}
GMTK0438	100	101.544	0.784 {3.14}
	120	117.113	0.784 {3.13}
	165	160.705	0.783 {3.13}
	200	192.560	0.782 {3.13}
GMTK0728 ※	5	5.061	2.41 {9.65}
	10	10.159	2.41 {9.63}
	15	14.694	2.36 {9.45}
	20	19.948	2.34 {9.34}
	25	25.397	2.32 {9.28}
GMTK0738 ※	30	30.381	2.29 {9.16}
	40	40.635	2.37 {9.48}
	50	49.143	2.37 {9.47}
	60	60.082	2.36 {9.46}
	75	74.667	2.36 {9.45}
GMTK0742 ※	100	96.281	2.44 {9.76}
	120	122.500	2.44 {9.76}
	165	160.821	2.44 {9.75}
	200	197.980	2.44 {9.74}
GMTK1538	5	5.000	4.54 {18.2}
	10	10.000	4.45 {17.8}
	15	15.000	4.29 {17.2}
	20	19.615	4.21 {16.9}
	25	24.091	4.17 {16.7}
	30	30.000	4.14 {16.6}
GMTK1542	40	39.253	4.25 {17}
	50	48.704	4.24 {17}
	60	61.492	4.24 {16.9}
	75	72.859	4.23 {16.9}
GMTK2242	5	5.000	16.3 {65.2}
	10	9.870	16.0 {64.1}
	15	14.454	15.9 {63.5}
	20	20.659	15.8 {63.0}
	25	25.455	15.7 {62.9}
	30	29.143	15.7 {62.7}

Note) The moment of inertia, GD², is a standalone value for the gear head and is converted to the moment of inertia on input shaft (motor shaft).
Regarding items indicated by the "*" symbol, for mount code "K3YC" flanges, add 1.48 × 10^-4 kg・m² (5.9 × 10^-4 kgf・m²) to the values listed in the above table.

Moment of Inertia on Input Shaft (Worm gear head )

Worm gear head SWJMK/SWMK Type

Moment of Inertia 　×10^-4kg･m²

{GD²} {×10^-4kgf・m²}

Size		SWJMK35	SWJMK42	SWJMK50	SWJMK63			SWJMK70			SWMK80		SWMK100
Flange □		□60	□60	□80	□80	□130	□176	□80	□130	□176	□130	□176	□176
Reduction ratio	10	0.363 {1.45}	0.468 {1.87}	2.39 {9.56}	5.31 {21.3}	7.32 {29.3}	15.4 {61.5}	4.59 {18.4}	6.54 {26.2}	14.5 {58.0}	11.7 {46.8}	19.7 {78.6}	31.8 {127}
	15	0.35 {1.40}	0.432 {1.73}	2.32 {9.28}	5.15 {20.6}	7.16 {28.6}	15.2 {60.8}	4.29 {17.2}	6.25 {25.0}	14.2 {56.8}	11.1 {44.3}	19.0 {76.2}	30.2 {121}
	20	0.347 {1.39}	0.423 {1.69}	2.24 {8.96}	4.95 {19.8}	6.96 {27.8}	15.0 {60.0}	4.28 {17.1}	6.24 {24.9}	14.2 {56.8}	10.5 {41.8}	18.4 {73.7}	28.8 {115}
	25	0.343 {1.37}	0.412 {1.65}	2.21 {8.84}	4.83 {19.3}	6.83 {27.3}	14.9 {59.5}	3.90 {15.6}	5.85 {23.4}	13.8 {55.3}	10.1 {40.3}	18.0 {72.1}	27.8 {111}
	30	0.344 {1.37}	0.414 {1.66}	2.28 {9.12}	5.06 {20.2}	7.06 {28.3}	15.1 {60.5}	4.12 {16.5}	6.07 {24.3}	14.0 {56.1}	10.7 {42.9}	18.7 {74.7}	29.2 {117}
	40	0.343 {1.37}	0.413 {1.65}	2.22 {8.87}	4.90 {19.6}	6.90 {27.6}	15.0 {59.8}	4.19 {16.7}	6.14 {24.5}	14.1 {56.4}	10.3 {41.0}	18.2 {72.9}	28.2 {113}
	50	0.341 {1.36}	0.406 {1.62}	2.20 {8.78}	4.79 {19.2}	6.80 {27.2}	14.8 {59.4}	3.83 {15.3}	5.78 {23.1}	13.8 {55.0}	9.94 {39.8}	17.9 {71.6}	27.5 {110}
	60	0.342 {1.37}	0.402 {1.61}	2.18 {8.74}	4.75 {19.0}	6.75 {27.0}	14.8 {59.2}	3.64 {14.6}	5.59 {22.4}	13.6 {54.2}	9.52 {38.1}	17.5 {69.9}	26.5 {106}

Note) The moment of inertia, GD², is a standalone value for the gear head and is converted to the moment of inertia on input shaft (motor shaft).

Worm gear head EWJMK/EWMK Type

Moment of Inertia 　×10^-4kg･m²

{GD²} {×10^-4kgf・m²}

Size		EWJMK35	EWJMK42	EWJMK50	EWJMK63			EWJMK70		EWMK80		EWMK100
Flange □		□60	□60	□80	□80	□130	□176	□130	□176	□130	□176	□176
Reduction ratio	10	3.58 {14.3}	4.50 {18.0}	3.11 {12.4}	5.29 {21.2}	7.30 {29.2}	15.3 {61.4}	9.90 {39.6}	18.0 {71.8}	11.4 {45.5}	19.3 {77.4}	31.2 {125}
	15	3.48 {13.9}	4.24 {17.0}	3.06 {12.2}	5.14 {20.6}	7.15 {28.6}	15.2 {60.8}	9.67 {38.7}	17.7 {70.9}	10.9 {43.8}	18.9 {75.6}	29.9 {120}
	20	3.46 {13.8}	4.18 {16.7}	2.99 {11.9}	4.95 {19.8}	6.95 {27.8}	15.0 {60.0}	9.27 {37.1}	17.3 {69.3}	10.4 {41.5}	18.4 {73.4}	28.6 {114}
	25	3.42 {13.7}	4.09 {16.4}	2.96 {11.8}	4.83 {19.3}	6.83 {27.3}	14.9 {59.5}	9.09 {36.4}	17.1 {68.6}	10.0 {40.1}	18.0 {72.0}	27.7 {111}
	30	3.43 {13.7}	4.12 {16.5}	3.03 {12.1}	5.06 {20.2}	7.06 {28.2}	15.1 {60.4}	9.53 {38.1}	17.6 {70.3}	10.7 {42.7}	18.6 {74.6}	29.2 {117}
	40	3.43 {13.7}	4.12 {16.5}	2.97 {11.9}	4.90 {19.6}	6.90 {27.6}	15.0 {59.8}	9.20 {36.8}	17.2 {69.0}	10.2 {41.0}	18.2 {72.8}	28.2 {113}
	50	3.40 {13.6}	4.05 {16.2}	2.95 {11.8}	4.79 {19.2}	6.80 {27.2}	14.8 {59.4}	9.04 {36.2}	17.1 {68.4}	9.93 {39.7}	17.9 {71.6}	27.4 {110}
	60	3.41 {13.7}	4.01 {16.0}	2.94 {11.7}	4.75 {19.0}	6.75 {27.0}	14.8 {59.2}	8.96 {35.8}	17.0 {68.0}	9.51 {38.0}	17.5 {69.9}	26.5 {106}

Note) The moment of inertia, GD², is a standalone value for the gear head and is converted to the moment of inertia on input shaft (motor shaft).

TSUBAKI Power Transmission Products Information Site

Technical Data Reducers Gear Reducer for Servo Motors TERVO Technical Data

Moment of Inertia on Input Shaft (Hypoid motor/Helical gear head )

Hypoid gear head HMTK Type

Helical gear head GMTK Type

Moment of Inertia on Input Shaft (Worm gear head )

Worm gear head SWJMK/SWMK Type

Worm gear head EWJMK/EWMK Type