Coupled-driven high-speed and high-torque switchable transmission with a large transmission ratio

ROBOMECH Journal

Table 2 Specifications of the used gear

Palameters		Coupled Drive					TWC		\(\text {D}_\text {1,2}\)
	Symbol	\(\text {G}_\text {S1,2}\)	\(\text {G}_\text {D1,2}\)	\(\text {G}_\text {T1}\)	\(\text {G}_\text {T2}\)	\(\text {G}_\text {C}\)	Planetary gear	Internal gear	Bevel gear
Module	m	0.5
Pressure angle	\(\alpha\)	20
Number of teeth	Z	40	24	60	14	70	23	60
Facewidth	b [mm]	3	3	3	5	5	3	3	2.5
Outer cone distance	\(R_a\) [mm]								7.1
Rotational speed (Initial assumption)	n [rpm]	7500	3750	1500	1500	300	0	0	7500
Maximum load	T [mNm]	36.5	40.6	183	183	823	78.8	205	40.6
Call circumference force	\(F_t\) [N]	3.65	6.77	6.77	52.3	52.3	13.7	13.7	1.37
Material		POM	POM	S45C	S45C	S45C	S45C	C3604	C3604
Allowable material stress at the root	\(\sigma _{lim}\) [N/mm]	39.2	39.2	137	137	137	137	26.2	26.2
Tooth form factor	\(Y_F\)			2.28	3.2	2.25	2.68	2.07	2.93
Load distribution factor	\(Y_\epsilon\)			0.591	0.625	0.625	0.508	0.508	0.61
Helix angle factor	\(Y_\beta\)			1	1	1	1	1	1
Life factor	\(K_L\)			1	1	1	1	1	1
Dimension factor	\(K_{FX}\)			1	1	1	1	1	1
Dynamic load factor	\(K_V\)			1.5	1.5	1.5	1.2	1.2	1.7
Overload factor	\(K_O\)			1	1	1	1	1	1
Tooth form factor	y	0.7	0.415
Speed correction factor	\(K_v\)	1.12	1.36
Temperature factor	\(K_T\)	1	1
Lubrication factor	\(K_l\)	0.75	0.75
Material factor	\(K_M\)	0.75	1
Service factor	\(C_S\)	0.8	0.8	Assumed 3 hrs/day
Safety factor	\(S_F\)	1.2
Cutter diameter effect factor	\(Y_C\)								1
Longitudinal load distribution factor	\(K_D\)								1.8
Reliability factor	\(K_R\)								1.4
Allowable circumference force	\(F_{tlim}\) [N]	27	26	85	95	135	112	28	3.0