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Precise axial displacement transmission device

An axial displacement and transmission technology, applied in transmission, belt/chain/gear, mechanical equipment, etc., can solve the problems of axial displacement transmission accuracy limitation, follow-up response, error, etc., to improve the minimum precision scale, reduce wear effect

Inactive Publication Date: 2015-01-07
李想
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the active part rotates once, and the driven part can only move axially at most a few tenths of a millimeter. In order to obtain a small axial displacement, the rotation angle of the active part must be very small. Due to the problems of inertia, static friction and rigidity in the system, the follower cannot follow the response 100%, resulting in errors
In addition, in order to obtain high axial displacement transmission accuracy for the traditional screw nut transmission pair, the screw nut forming the transmission pair must achieve higher machining accuracy. The internal and external thread surfaces of the screw nut must be ground, but the internal thread with a small inner diameter Difficult to grind
Therefore, the improvement of axial displacement transmission accuracy is limited to a certain extent.

Method used

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Embodiment Construction

[0028] like Figure 1-3 As shown, a precision axial displacement transmission device with a box structure includes a box body, an input shaft 5, a transmission shaft I, a transmission shaft II, and three screw shafts 1, 2, and 3 with coplanar axes to form a parallel meshing Screw transmission pair.

[0029] The box includes a front box 6 and a rear box 7 .

[0030] The input shaft is supported on the upper part of the rear case through a pair of sliding bearings.

[0031] Two transmission shafts are located in the middle part of the rear box body, and the two transmission shafts mesh with the gears on the input shaft respectively through gears, and the two transmission shafts and the input shaft are arranged in parallel.

[0032] The thread transmission pair is located at the lower part of the box body, and the thread transmission pair includes two long-thread screw shafts II and III and one short-thread screw shaft I. Two long-thread screw shafts, one short-thread screw sh...

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Abstract

A precise axial displacement transmission device of a box body structure comprises a box body, an input shaft, two transmission shafts and a parallelly-meshed threaded transmission pair consisting of three axis-coplaner screw shafts, namely two long threaded screw shafts and one short threaded screw shaft. One of the two long threaded screw shafts is supported in a front box body bearing hole to serve as a positioning reference for displacement transmission. The other one of the two long threaded screw shafts is supported in the front box body bearing hole to play a meshing gap eliminating role. The short threaded screw shaft is of a split structure formed by a taper pin connecting screw and a mandrel, and the mandrel is supported in the front box body bearing hole to play a displacement transmission role. The upper gear of an input shaft supported at the upper portion of a rear box body drives gears located at the rear ends of the three screw shafts respectively though gears on two middle transmission shafts so as to achieve differential rotation of the three screw shafts. Compared with a traditional screw and nut transmission pair, the minimum precision scale of axial displacement can be remarkably improved.

Description

technical field [0001] The invention relates to a precision axial displacement transmission device, which belongs to a screw transmission pair formed by a new meshing method. Background technique [0002] The traditional mechanical precision axial displacement transmission device mostly adopts the form of screw (screw) and nut. With the current processing methods and the strength requirements for the thread tooth shape, the thread pitch can only be in the order of millimeters to 1 / 10 millimeters . Therefore, the active part rotates once, and the driven part can only move axially at most a few tenths of a millimeter. In order to obtain a small axial displacement, the rotation angle of the active part must be very small. Due to the problems of inertia, static friction and rigidity in the system, the follower cannot follow the response 100%, resulting in errors. In addition, in order to obtain high axial displacement transmission accuracy for the traditional screw nut transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/24
CPCF16H25/24
Inventor 李军李想
Owner 李想
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