Large-stroke planetary roller screw pair
A planetary roller and screw pair technology, applied in the field of precision transmission, can solve problems such as difficulty in meeting large-stroke telescopic requirements, achieve the effects of free thread meshing, avoid the use of end gears, and save processing costs
Inactive Publication Date: 2017-12-29
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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Problems solved by technology
[0004] In some special applications, it is required that the screw pair can achieve a larger telescopic stroke, and the rigidity of the transmission parts will be reduced by using a longer screw or nut. It is difficult to meet the demand for large-stroke telescopic expansion based on the existing structural composition.
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[0026] see Figure 1-5 , the embodiment of the present invention provides a large stroke planetary roller screw pair, including a nut 1, a first planetary roller assembly 8, a second planetary roller assembly 9, a first screw 2 and a second screw 3, The first screw 2 is arranged on the first end of the nut 1 through the first planetary roller assembly 8, and the second screw 3 is arranged on the second end of the nut 1 through the second planetary roller assembly 9. When the nut 1 rotates, The first screw mandrel 2 and the second screw mandrel 3 move toward or away from each other.
[0027] The large-stroke planetary roller screw pair provided by the embodiment of the present invention simultaneously controls two screw screws to move away from each other or to each other through the same nut, so as to realize the rotation of the same nut and the linkage of the two screw rods, respectively by optimizing different lead series parameters, It can match the lead of non-standard se...
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The embodiment of the invention provides a large-stroke planetary roller screw pair and belongs to the technical field of precise transmission. The large-stroke planetary roller screw pair comprises a nut, a first planetary roller assembly, a second planetary roller assembly, a first screw and a second screw, wherein the first screw is arranged at the first end of the nut through the first planetary roller assembly, and the second screw is arranged at the second end of the nut through the second planetary roller assembly. When the nut rotates, the first screw and the second screw oppositely move or move in a back-to-back manner, so that the problem of large rotating clearance caused by key connection is avoided. The whole structure is high in rigidity, small in size and particularly suitable for nut driving type occasions with large stroke application requirements.
Description
technical field [0001] The invention belongs to the technical field of precision transmission, and in particular relates to a shared-nut differential large-stroke planetary roller screw pair. Background technique [0002] As a precision linear motion unit, the planetary roller screw pair is widely used in high-end CNC machine tools, precision instruments, industrial robots, high-end weaponry and other fields due to its unique structure and superior performance. In terms of the pair, the planetary roller screw pair adopts thread transmission, and the bearing medium is a certain number of rollers arranged in a circle, and the load contact point is more, so under the premise of the same screw diameter, it can bear greater load and even load The effect is more obvious. [0003] By studying the structure of most planetary roller screws at present, it can be found that it is mainly composed of a nut, a screw, two cages and a number of rollers. The driving method is divided into t...
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IPC IPC(8): F16H25/22
CPCF16H25/2252F16H2025/2059
Inventor 宋洪舟徐强侍威王水铭刘伟
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS