Steel Spiral Bevel Gears Spiral Tooth System Ratio 1:1

Steel spiral bevel gears with a spiral tooth system and a 1:1 ratio, also known as spiral miter gears, are precision-engineered components designed to transmit rotational motion and torque between two intersecting shafts at a 90-degree angle. These gears feature helical teeth cut at a 35-degree spiral angle, ensuring smoother and quieter operation compared to straight bevel gears due to gradual tooth engagement. Typically made from high-strength carbon or alloy steels like 42CrMo4 or 16MnCr5, the teeth are often induction or case-hardened for enhanced durability and wear resistance.

The 1:1 ratio indicates equal tooth counts on the pinion and gear, resulting in no speed change. Key geometric parameters include the module (pitch), outer diameter, mounting distance, and cone distance, with no profile shift in standard designs. These gears are ideal for high-speed, high-torque applications like rotorcraft or industrial machinery, offering low vibration and reliable performance.

Steel Spiral Bevel Gear Ratio 1:1

Module	Number of teeth	da	d	ND	NL	L1	L	S1)	b	BH7	E	Torque*	Weight
		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
0,6	16	15,8	15,5	10	4,5	9	10,0	7,7	3,3	5	15	0,64	12
0,6	20	16,9	16,5	12	6,5	11	12,0	9,2	4	5	17	1,27	19
0,6	25	23,3	22,5	19	7,2	12	13,4	9,2	6	6	20	2,1	50
0,6	30	27,8	27	22	7	13	14,9	9,9	7	8	23	3,0	75
0,6	35	32,3	31,5	25	7,2	15	16,3	10,6	8	8	26	3,5	116
1	16	25,4	24	17	7,5	13,5	15,95	11,7	6	6	23	2,5	55
1	20	31,4	30	25	8,4	15	17,3	11,7	8	8	26	6,3	112
1	25	38,9	37,5	25	8	16	19,0	11,9	10	10	30	10,0	155
1	30	46,4	45	30	8	19	21,7	13,2	12	10	35	14,3	278
1,3	20	41,8	40	30	7,3	19	20,7	12,9	11	10	32	14,8	222
1,3	25	51,8	50	30	8	19	21,8	11,9	14	10	36	18,5	326
1,3	30	61,8	60	35	8	21	24,2	12,9	16	12	42	31,5	530
1,5	18	41,7	39,6	30	8	17	20,3	13,2	10	10	32	15,9	209
1,5	24	54,9	52,8	35	8	20	22,6	12,7	14	10	38	21,2	408
1,5	28	63,7	61,6	40	8	20	23,2	13,3	14	12	43	34,5	576
2,2881	21	71,5	70	45	15	28	32,22	22,5	15	16	55	70	973
2,236	24	79,0	78	45	15	29	32,48	23,7	14	16	60	73	1200
2	26	82,0	80	55	20	35	37,73	26,8	16	16	65	42	1581
2,5	19	90,0	88	56	18	34	36,91	23,5	20	20	65	185	1700
2,5	24	98,0	96	54	16	32	37,2	24,5	19	20	70	188	2000
3	21	103,0	100	68	17	36	43,4	27,7	23	25	75	240	2600
3	24	115,0	112	64	18	34	41,7	26,7	22	25	80	260	2800
3,5	24	131,0	128	72	20	38	46,15	29,5	25	30	90	396	4200
3,5	26	144,0	140	85	30	57	62,3	43,0	28	30	110	238	7300

Ratio 1:1 Steel Spiral Bevel Gear Design Features

1. Spiral Tooth Geometry: The teeth are cut at a 35-degree spiral angle, enabling gradual contact during meshing. This reduces impact loads, minimizes noise, and enhances smoothness, making these gears suitable for high-speed applications like automotive or aerospace systems.
2. Material Selection: Typically made from high-strength alloy steels such as 42CrMo4 or 16MnCr5, these spiral miter gears offer excellent toughness and fatigue resistance. Heat treatments like case hardening ensure a hard, wear-resistant surface while maintaining a ductile core for impact resistance.
3. 1:1 Gear Ratio: The equal tooth count on the pinion and gear ensures no speed reduction or increase, maintaining identical rotational speeds. This design is ideal for applications requiring direct torque transfer, such as in machine tools or rotorcraft.
4. Precision Manufacturing: These spiral bevel gears are manufactured using advanced methods like Gleason or Klingelnberg systems, ensuring tight tolerances. Precision machining of tooth profiles and mounting distances guarantees optimal load distribution, reducing wear and extending service life in high-torque environments.
5. Lubrication and Cooling: The spiral tooth design facilitates better lubricant retention compared to straight bevel gears. This reduces friction and heat buildup, critical for maintaining performance in continuous-duty applications like industrial gearboxes or heavy machinery.
6. Load Distribution: The curved tooth profile distributes contact stresses across multiple teeth, enhancing load-carrying capacity. This minimizes localized wear and prevents tooth breakage, ensuring reliability in high-power applications such as marine propulsion or conveyor systems.

Common Applications of Spiral Miter Gears

• Automotive Differentials: Spiral miter gears are used in vehicle differentials to transfer torque between perpendicular shafts, ensuring smooth power distribution to wheels. Their spiral teeth reduce noise and vibration, enhancing driving comfort and handling, especially in high-performance or off-road vehicles.
• Rotorcraft Drivetrains: In helicopters, these steel bevel gears transmit power from the engine to the rotor system at a 90-degree angle. Their high strength and smooth operation handle high torque and rotational speeds, ensuring reliable performance in demanding aerospace environments.
• Industrial Gearboxes: Spiral miter gears are integral to industrial gearboxes in manufacturing equipment, such as conveyors or mixers. Their precision and load-carrying capacity support continuous operation, reducing wear and maintenance in high-torque, high-speed industrial processes.
• Machine Tools: These steel spiral bevel gears are used in CNC machines and lathes to control precise angular motion. Their smooth meshing and low backlash ensure accurate positioning, critical for producing complex parts in industries like aerospace and automotive manufacturing.
• Marine Propulsion Systems: In marine applications, spiral miter gears connect engines to propeller shafts, transmitting power efficiently. Their durability and ability to handle high loads under harsh conditions make them suitable for boats and ships requiring reliable performance.
• Robotics and Automation: Steel bevel gears are employed in robotic arms and automated systems to facilitate precise 90-degree motion. Their compact design and low noise make them ideal for applications requiring high precision and reliability in confined spaces.

Automotive Industry	Marine Industry
Aerospace Industry	Industrial Machinery