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Gear and rack transmission anti-backlash mechanism

A technology of rack and pinion, which is applied in the direction of transmission parts, belt/chain/gear, mechanical equipment, etc., can solve the problems of backlash and other problems, and achieve the effect of large transmission torque, reliable operation and clearance elimination.

Inactive Publication Date: 2015-10-07
HUBEI UNIV OF AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of backlash often existing in the existing rack and pinion transmissions, the present invention proposes a backlash-removing mechanism for rack and pinion transmissions that can automatically eliminate backlash

Method used

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  • Gear and rack transmission anti-backlash mechanism
  • Gear and rack transmission anti-backlash mechanism

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Embodiment Construction

[0016] Such as Figure 1 to Figure 3 As shown, the rack and pinion transmission anti-backlash mechanism 1 of the present invention includes a gear 11, a rack 12, a screw shaft 13, a bearing support 14, a needle bearing 15, a nut 16, a nut support 17 and a plane scroll spring 18.

[0017] The rack 12 is composed of two racks superimposed on the first rack 121 and the second rack 122, and meshes with the gear 11; the thickness of the first rack 121 and the second rack 122 are equal, and the first rack 121 and the second rack The sum of the thicknesses of the two racks 122 is equal to the width of the gear 11;

[0018] The two ends of the first rack 121 are symmetrically provided with guide rods 120, and the guide rods 120 are symmetrical about the axial ends of the screw shaft 13; The two sides protrude to both sides respectively;

[0019] Both ends of the second rack 122 are provided with guide holes 123 along the direction of the guide rod 120 of the first rack 121, and the...

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Abstract

The invention relates to a gear and rack transmission anti-backlash mechanism. The gear and rack transmission anti-backlash mechanism comprises a gear and a rack. The rack is formed by stacking a first rack body and a second rack body and is meshed with the gear. The anti-backlash mechanism further comprises a lead screw shaft, a bearing support, needle bearings, a nut, a nut support and a plane spiral spring which are placed in a cavity formed in the first rack body and the second rack body. The two ends of the lead screw shaft are installed on the bearing support through the needle bearings, and the bearing support is fixed to the second rack body. The lead screw shaft is matched with the nut, and the nut is installed on the first rack body through the nut support. The two ends of the plane spiral spring are fixed to the lead screw shaft and the second rack body respectively. According to the anti-backlash mechanism, when a transmission backlash occurs between the gear and the rack, teeth of the two rack bodies are staggered under the elasticity effect of the spiral spring, the equivalent tooth thickness is increased, the transmission backlash between the gear and the rack is eliminated, transmission torque is large, the structure is simple, work is reliable, and the gear and rack transmission anti-backlash mechanism is suitable for the field of numerical control without backlash transmission, and especially for high-accuracy numerical control machine tools and robots.

Description

technical field [0001] The invention belongs to the technical field of machine tools, and relates to a transmission system of a numerically controlled machine tool, in particular to a rack and pinion transmission anti-backlash mechanism capable of automatically eliminating tooth side backlash. Background technique [0002] In the field of CNC machine tools and robots with backlash-free transmission, rack and pinion transmissions are often used. However, rack and pinion transmission often has backlash, which requires measures to eliminate backlash in the rack and pinion transmission mechanism to ensure the two-way transmission accuracy of the mechanism. Therefore, for high-precision machine tools, it is particularly important to eliminate the clearance of the rack and pinion mechanism. [0003] The method usually used at present is the double-plate thin gear staggered tooth adjustment method. In this method, when there is a gap in the rack-and-pinion mechanism, the tension ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/28F16H57/12
CPCF16H55/28F16H2057/127
Inventor 邱新桥吴家浩
Owner HUBEI UNIV OF AUTOMOTIVE TECH
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