Steel Spiral Bevel Gears Spiral Tooth System Ratio 2:1 – 2.5:1
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Steel spiral bevel gears with a spiral tooth system and ratios between 2:1 and 2.5:1 are conical gears designed to transmit power between intersecting shafts, typically at a 90-degree angle. The spiral tooth design, characterized by curved, angled teeth, ensures smoother and quieter operation compared to straight bevel gears, reducing noise and impact stress at high speeds. These gears are typically made from carbon or alloy steels like 42CrMo4 or 16MnCr5, with teeth often induction- or case-hardened for durability, while hubs and bores remain soft. They are ideal for applications requiring precise torque and speed changes, such as in locomotives, marine systems, or industrial machinery.
Steel Spiral Bevel Gear Ratio 2:1
Module
Number of teeth
da
d
ND
NL
L1
L
S
b
BH7
E
Torque*
Weight
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
Ncm
g
0,6
22
20,8
19,8
16
7,4
15
15,6
8,5
8
6
28
2,3
116
0,6
44
40,1
39,6
25
8
15
17,2
13,6
8
10
23
4,6
116
1
20
31,8
30
25
8
19
20,2
9,4
12
8
39
9,8
323
1
40
60,9
60
40
8
18
21,2
15,9
12
12
30
19,6
323
1,3
16
34,4
32
25
7
20
22,1
9,6
14
8
41
12,0
397
1,3
32
65,1
64
40
8
20
23,3
17,1
14
12
32
24,0
397
1,5
16
38,0
35,2
30
8,4
19
21,2
10,5
12
10
45
14,4
435
1,5
32
71,7
70,4
45
8
17
21,0
15,7
12
12
32
28,8
435
2,269
12
44,0
41,5
30
12
28,23
28,23
17,6
15
12
55
10,1
846
2,269
24
83,0
83
50
15
27
32,41
26,0
15
16
45
20,2
846
2,321
13
47,0
45
30
15
30
33,0
21,7
15
10
63,65
49
818
2,321
26
91,0
90
40
22
30
35,5
29,8
15
16
50
98
818
2,5
11
57,0
52,5
40
15
36,72
36,72
19,7
20
16
70
17,8
2000
2,5
22
106,0
105
70
20
39
44,65
35,8
20
20
60
35,6
2000
2,5
13
59,0
56
39
15
34
38,37
22,9
20
16
75,13
95
1400
2,5
26
113,0
112
54
21
30
37,72
29,0
20
25
55
190
1400
3
13
68,0
64
45
16
37
41,95
24,9
22
20
84,62
133
2000
3
26
128,0
128
54
20
32
39,9
30,6
22
25
60
266
2000
3
14
76,0
72,5
55
25
51,46
51,46
32,0
25
20
100
644
4800
3
28
146,0
145
90
25
50
57,1
46,2
25
30
80
128
4800
3,5
13
77,0
72
54
12
34
39,8
21,1
24
20
88,38
197
2800
3,5
26
146,0
144
64
25
38
47,1
36,5
24
30
70
394
2800
Steel Spiral Bevel Gear Ratio 2.066:1
Module
Number of teeth
da
d
ND
NL
L1
L
S
b
BH7
E
Torque*
Weight
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
Ncm
g
1
15
24,1
21,8
19
6
13,2
13,3
7,0
7
8
29,0
3,6
112
1
31
45,6
45,0
24
8
14,0
16,3
13,2
7
10
23,5
7,4
112
Steel Spiral Bevel Gear Ratio 2.5:1
Module
Number of teeth
da
d
ND
NL
L1
L
S
b
BH7
E
Torque*
Weight
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
Ncm
g
0,6
22
20,9
19,8
16
6,8
16
16,7
7,5
10
6
32
2,6
172
0,6
55
49,9
49,5
30
8
16
19,3
15,6
10
10
25
6,5
172
1,0
20
31,8
30
25
8,4
21
22,8
9,8
14
8
47
9,9
355
1,0
50
75,7
75
50
8
18
21,1
15,9
14
12
30
24,8
355
1,3
14
30,5
28
22
8,7
20
21,6
10,5
12
8
45
11,3
420
1,3
35
70,9
70
45
8
18
21,6
17,1
12
12
30
28,2
420
1,5
16
38,0
35,2
30
7,5
20
21,6
9,6
13
10
53
14,5
624
1,5
40
89,1
88
60
8
16
20,6
15,8
13
15
32
36,3
624
3,6
9
62,0
54,78
40
14,17
34
38,35
20,9
21
16
87,06
150
2400
3,6
23
141,0
140
70
35
45
52,53
45,0
21
30
70
383
2400
Key Features of Steel Spiral Bevel Gears
Spiral Tooth Design: The curved, angled teeth of steel spiral bevel gears ensure smooth, quiet operation by providing gradual tooth engagement. This reduces vibration and impact stress, making them ideal for high-speed applications like automotive differentials or industrial machinery.
Material Strength: Typically made from high-strength carbon or alloy steels such as 42CrMo4 or 16MnCr5, these gears offer excellent durability. Teeth are often case- or induction-hardened to withstand heavy loads, while hubs and bores remain softer for machining ease.
Precise Gear Ratios: Available in ratios like 2:1 to 2.5:1, these steel bevel gears enable accurate torque and speed adjustments. For example, a 2:1 ratio might use 16/32 teeth, ensuring efficient power transfer in applications requiring specific speed reductions.
90-Degree Power Transmission: Designed for intersecting shafts at a 90-degree angle, spiral bevel gears efficiently transfer motion and torque. This makes them essential in systems like marine propulsion or locomotive drives, where space and alignment are critical.
High Load Capacity: The robust steel construction and spiral tooth geometry distribute loads evenly across multiple teeth, enhancing load-bearing capacity. This ensures reliability under high-torque conditions, such as in heavy-duty industrial or aerospace applications.
Standards Compliance: Manufactured to standards like DIN 3964 or 3967, these steel bevel gears ensure precision in tooth profile and alignment. Sold as matched pairs, they guarantee compatibility and optimal meshing, reducing wear and extending operational life in demanding environments.
Steel Spiral Bevel Gear Applications
Automotive Differentials: Steel spiral bevel gears are extensively used in automotive differentials to transfer power from the drive shaft to the wheels. Their ability to handle high torque, provide smooth power transmission, and minimize noise ensures efficient vehicle performance under various conditions.
Industrial Machinery: These gears are vital components in heavy-duty industrial machines such as conveyors, mixers, and crushers. Their high load capacity and durability make them suitable for applications that require reliable performance in harsh environments or continuous operation.
Aerospace Systems: Aerospace applications demand precision and high strength, making spiral bevel gears ideal for aircraft engines, landing gear systems, and control mechanisms. Their smooth operation, precision engineering, and lightweight yet robust construction ensure reliability in critical aerospace functions.
Marine Propulsion Systems: Spiral bevel gears are commonly used in marine propulsion systems to transmit power efficiently from engines to propellers. Their robustness, corrosion resistance, and quiet operation make them perfect for the demanding conditions of marine environments.
Robotics and Automation: In robotic arms and automated systems, these gears enable precise motion control and power transmission. Their ability to operate quietly and efficiently while maintaining high accuracy is essential for the smooth functioning of advanced robotic mechanisms.
Power Generation Equipment: Steel spiral bevel gears are employed in turbines, wind energy systems, and generators. Their high efficiency in transmitting torque, coupled with their durability, ensures reliable performance in power generation applications that require continuous and consistent operation.
