In recent years crossover SUVs have been gaining popularity, especially in Europe and Japan. This has created a demand for both off-road and on-road performance. For this reason, CVJs with superb NVH performance and a large operating angle are required for the inboard (differential) drive shafts used in these crossover SUVs.
NTN Corporation has already achieved a large operating angle of 30° with its DOJ ball-type plunging CVJ, and now it has developed the PTJ -- the world's largest operating angle in a low-vibration tripod plunging CVJ.
The newly developed 30° PTJ features an optimized internal design using FEM and mechanism analysis achieving the world's highest level of vibration characteristics in a plunging CVJ. These characteristics impact automobile noise, vibration and harshness (NVH) during application. The outer diameter of the joint housing was not increased with the added joint angle capacity, which is also valuable to packaging and mass requirements. Additionally, the operating-angle of low-vibration range was increased to 17°, which can greatly contribute to improving automakers' freedom in designing suspensions and the like. This will lead to reduction in shudder during initial vehicle acceleration, even during fast starts when the front of the vehicle rises considerably (in this state, the CVJ operating angle increases).
As demand for improved comfort and freedom of drive layout for automobiles increases, NTN will offer these joints, which meet these needs, to its global customers.
1. Large operating angle
Maximum operating angle of 30° achieved (4° greater than current PTJ)
2. Low vibration characteristics
Low-vibration operating range increased to 17° (2° greater over the current PTJ)
3. Outer diameter/weight
Equivalent to current PTJ
Planning and Marketing Department, Automotive Sales Headquarters,
Phone: 03-5487-2811
[Points appealing to Customers]
At 30°, the PJT has the world's largest operating angle of any tripod-type plunging constant-velocity (CV) joint, while maintaining world-class low-vibration characteristics and without increasing the outer diameter.
[Features]
1. Max operating angle: 30° (Current PTJ: 26°)
2. Low vibration range: Max about 17°
(Current PTJ: Max about 15°)
3. External diam.: Same as current PTJ
[Means to Achieve Results]
1. The shape of the inner diameter of the roller was changed to increase the low-vibration range and achieve an operating angle of 30° without interference between roller and outer race
2. This interference-avoiding design prevented increases in outer race diameter
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