KHK Worm Gears Catalogue - KHK - (Version JPG) - Page n° 3 - PDF Catalogue | Technical Documentation

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Planetary gearbox, Gear, Plastic gear, Gear coupling, Worm gear

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■ Efficiency of SWG/AG Worm Gear Pair (%)

1. Efficiency of Worm Gear Pair

The efficiency of power transmission varies somewhat with the conditions of assembly and lubricant, but is generally 30-90% (excludes losses from bearings and churning of lubricants). The efficiency of KHK stock worm gear pair is given below as a reference. To learn more

about strength calculation, please refer to the technical

information contained in the"Strength of Worm Gearing" section on page 592.

■ Efficiency of KWGDLS/AGDL Worm Gear Pair (%)

(rpm = Rotation of worm)


Worm rpm Catalog Na^~~~».^	100	300	600	900	1200	1800
SWG1-R1	34	40	45	48	51	54
SWG1.5-R1	35	42	47	51	53	57
SWG2-R1	38	45	51	55	56	61
SWG2.5-R1	40	48	54	57	60	63
SWG3-R1	41	49	55	58	62	65
SWG4-R1	42	51	56	61	63	67
SWG5-R1	46	54	60	64	66	70
SWG6-R1	48	57	64	66	68	73
SWG1-R2	51	56	62	64	67	70
SWG1.5-R2	52	59	64	67	69	73
SWG2-R2	55	62	67	70	72	75
SWG2.5-R2	57	64	69	72	75	77
SWG3-R2	58	66	71	73	76	78
SWG4-R2	59	67	72	75	77	80
SWG5-R2	62	70	75	78	79	82
SWG6-R2	65	72	77	80	81	84
SWG3-R3	67	74	78	80	82	84
SWG4-R3	68	75	79	82	83	86

(rpm = Rotation of worm)


Worm rpm Catalog Na^~~~->^	100	300	600	900	1200	1800
KWGDL2-R1	38	45	51	55	56	61
KWGDL2.5	40	48	54	57	60	63
KWGDL3	41	49	55	58	62	65
KWGDL3.5	42	50	56	61	62	65
KWGDL4	42	51	56	61	63	67

■ Efficiency of KWG/AG, AGF Worm Gear Pair (%)

(rpm = Rotation of worm)


Worm rpm Catalog Na^~~~—	100	300	600	900	1200	1800
KWG0.5-R1	30	34	38	41	43	46
KWG0.8-R1	35	40	44	47	49	53
KWG1-R1	34	40	45	48	51	54
KWG1.5-R1	35	42	47	51	53	57
KWG2-R1	45	51	56	60	62	65
KWG2.5-R1	44	51	57	61	62	67
KWG3-R1	44	52	58	61	64	67
KWG4-R1	50	58	64	66	70	72
KWG5-R1	51	60	66	69	71	73
KWG6-R1	53	61	66	70	72	75
KWG0.5-R2	46	50	54	58	60	63
KWG0.8-R2	51	56	61	64	66	69
KWG1-R2	51	56	62	64	67	70
KWG1.5-R2	52	59	64	67	69	73
KWG2-R2	61	67	71	74	76	78
KWG2.5-R2	60	67	72	75	76	80
KWG3-R2	61	68	73	75	78	80
KWG4-R2	66	73	77	79	82	84

2. Self-Locking Feature of Worm Gear Pair

Self-locking is defined as the inability of worm wheels to drive the worms. Factors affecting the self-locking feature

include the materials of the worm and worm wheel, lead angle, precision of manufacture, types of bearings, lubricant,

etc. Thus, it is not dependent simply on the lead angle. But, in general, self-locking will occur when the lead angle in a single thread worm is less than 4°.For systems requiring failsafe prevention of back drive, we recommend other braking mechanisms or one-way clutches.

■ Efficiency of SW, SUM / CG, BG, PG Worm Gear Pair (%)

The efficiency is approximately as follows, depending on

the assembly, loading, lubrication and rotational speed.


Catalog No.	Thread	Efficiency(%)
SW/SUW	Single thread	40 ~ 50%
SW/SUW	Double thread	50 ~ 60%

KHK Worm Gears Catalogue - KHK - #3

Planetary gearbox, Gear, Plastic gear, Gear coupling, Worm gear