Steel Spiral Bevel Gears Spiral Tooth System Ratio 1.2:1 – 1.6:1
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Steel spiral bevel gears with a spiral tooth system and ratios between 1.2:1 and 1.6:1 are specialized mechanical components designed to transmit power between intersecting shafts, typically at a 90-degree angle. These gears feature curved, angled teeth (spiral teeth) that provide smoother, quieter operation and higher load capacity compared to straight bevel gears. The gear ratio, ranging from 1.2:1 to 1.6:1, indicates the speed relationship between the pinion and gear, calculated by dividing the number of teeth on the gear by the number of teeth on the pinion.
Typically made from materials like 42CrMo4 (for modules up to 1.5) or 16MnCr5 (for modules 2.0 and above), these gears have induction- or case-hardened teeth for durability, with soft hubs and bores. They are designed with a cyclo-palloid or palloid spiral tooth system, adhering to standards like DIN 3967 for tooth quality. These gears are ideal for applications requiring precise torque transmission, such as in automotive, marine, or industrial machinery.
Steel Spiral Bevel Gear Ratio 1.214:1
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
1,5
14
41,0
38,7
22
11
21,1
24,3
15,4
11,5
12
38,0
14,1
236
1,5
17
48,9
47,0
30
11
20,9
23,9
16,6
11,5
15
34,8
17,1
236
Steel Spiral Bevel Gear Ratio 1.385:1
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
1,5
13
36,7
33,9
22
11
21,6
24,1
16,0
10
12
38,5
11,3
216
1,5
18
48,5
47,0
30
11
20,9
24,7
18,9
10
15
34,8
15,7
216
Steel Spiral Bevel Gear Ratio 1.5:1
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
20,8
19,8
17
7
13
14,3
8,5
7
6
23
2,2
116
0,6
33
30,3
29,7
20
8
14
15,5
11,6
7
8
21
3,3
116
1
20
31,6
30
25
8
17
18,3
10,0
10
8
32
8,1
166
1
30
46,3
45
30
8
17
19,5
14,0
10
10
28
12,2
166
1,3
16
34,3
32
25
8
18
19,9
10,7
11
8
34
11,9
220
1,3
24
49,4
48
30
8
18
21,1
15,0
11
10
30
17,9
220
1,5
16
37,8
35,8
30
8
17
18,8
10,5
10
10
36
14,3
273
1,5
24
54,4
52,8
35
8
17
21,1
15,6
10
10
32
21,5
273
2
16
53,0
50
35
6
18
21,37
12,8
11
10
48,45
41,0
561
2
24
76,0
75
39
15
24
27,53
21,7
11
16
45
61,5
561
2,5
16
67,0
64
40
14
25
31,89
19,9
16
16
65
84
1300
2,5
24
97,5
96
54
14
23
28,66
20,1
16
20
50
126
1300
3
16
79,0
76
50
15
28
35,71
21,9
19
20
75
160
1682
3
24
115,0
114
64
18
28
34,69
24,8
19
25
60
240
1682
Steel Spiral Bevel Gear Ratio 1.615:1
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
13
20,8
18,6
16
8,2
12
13,9
9,3
5
8
24
2,4
45
1
21
30,8
30,0
20
6
10,5
12,0
9,3
5
10
18
3,9
45
Steel Spiral Bevel Gear Benefits
Smooth and Quiet Operation: The spiral tooth design ensures gradual tooth engagement, reducing vibration and noise compared to straight bevel gears. This makes them ideal for high-speed applications like automotive differentials or marine transmissions, where quiet performance enhances user comfort and system longevity.
High Load Capacity: Spiral bevel gears distribute loads evenly across the curved teeth, allowing them to handle higher torque and shock loads. This durability, enhanced by materials like 42CrMo4 or 16MnCr5, suits demanding industrial machinery and heavy-duty equipment.
Improved Efficiency: The spiral tooth geometry minimizes friction and wear during operation, leading to higher power transmission efficiency. This reduces energy losses, making these gears suitable for precision applications like robotics or CNC machines requiring consistent performance.
Versatile Ratio Range: With ratios of 1.2:1 to 1.6:1, these steel bevel gears offer flexibility in speed and torque adjustments. This adaptability supports diverse applications, from automotive systems to conveyor drives, allowing precise control over rotational speed and power output.
Enhanced Durability: Constructed from hardened steel with induction- or case-hardened teeth, these steel bevel gears resist wear and fatigue. The robust design, adhering to standards like DIN 3967, ensures long service life even in harsh environments like mining or aerospace.
Compact Design for Space Efficiency: Spiral bevel gears enable power transmission between intersecting shafts, typically at 90 degrees, in a compact form. This space-saving design is critical for applications like vehicle drivetrains, where size constraints demand efficient, high-performance components.
Applications of Steel Spiral Bevel Gears
Automotive Differentials: Steel spiral bevel gears are integral in vehicle differentials, transmitting power from the driveshaft to the wheels at a 90-degree angle. Their smooth operation and high torque capacity ensure reliable performance in cars, trucks, and off-road vehicles under varying loads.
Industrial Machinery: These bevel gears are used in heavy-duty industrial equipment like milling machines and lathes. Their ability to handle high loads and precise ratios (1.2:1 to 1.6:1) supports efficient power transmission in manufacturing processes requiring consistent speed control.
Marine Propulsion Systems: In marine applications, steel bevel gears drive propeller shafts, transferring power from engines to propellers. Their durability, using materials like 42CrMo4, and quiet operation make them ideal for yachts, ships, and other watercraft in harsh environments.
Aerospace Actuators: Spiral bevel gears are employed in aerospace for actuators in landing gear and flight control systems. Their compact design and high strength ensure reliable performance under extreme conditions, meeting stringent safety and precision standards in aviation.
Robotics and Automation: In robotic arms and automated systems, these gears provide precise torque and speed control. Their smooth engagement and efficiency support high-precision tasks in manufacturing, assembly lines, and medical robotics, where compact, reliable components are essential.
Mining Equipment: Steel bevel gears are used in mining machinery like conveyors and crushers. Their robust construction, with case-hardened teeth, withstands abrasive conditions and heavy loads, ensuring continuous operation in rugged environments while maintaining efficiency and durability.
