Mutual-lapping device for improving gear machining accuracy and the mutual-lapping method thereof

Patent metadata

Field	Value
Publication number	US-11090743-B2
Application number	US-201816969344-A
Country	US
Kind code	B2
Filing date	May 9, 2018
Priority date	May 9, 2018
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A mutual-lapping device and mutual-lapping method for improving processing precision based on the principle of error averaging is proposed. The device including driving friction wheel, driving belt pulley, transmission belt A, connecting rod A, rotation shaft segment A, multi-ball sleeve, mutual-lapping gear A, tension spring, driven friction wheel, pendulum bar of the driven friction wheel, driven belt pulley, transmission belt B, connecting rod B, pressure spring of tensioning pulley, tensioner mechanism, rotation shaft segment B and mutual-lapping gear B. By mutual lapping the high-precision gears, not only the pitch deviation, tooth profile deviation, helix deviation and runout can be reduced synchronously, but also the machining cost is low. Meanwhile, the effect of improving pitch accuracy, profile accuracy, helix accuracy and runout accuracy and reducing surface roughness is remarkable.

First claim

The invention claimed is:

1. A mutual-lapping device for improving gear machining accuracy, comprising: a driving friction wheel, a driving belt pulley, a transmission belt A), a connecting rod A, a rotation shaft segment A, multi-ball sleeve, a mutual-lapping gear A, a tension spring, a driven friction wheel, a pendulum bar of the driven friction wheel, a driven belt pulley, a transmission belt B), a connecting rod B, a pressure spring of tensioning pulley, a tensioner mechanism, a rotation shaft segment B, a mutual-lapping gear B;
the driving friction wheel driven by a motor rotates around fixed rotary center; the driving belt pulley is rigidly coaxially connected with the driving friction wheel, and the rotary center coincides with rotary center of one end of the connecting rod A; the other end of the connecting rod A is connected with the rotation shaft segment A, and the mutual-lapping gear A rotates with the rotation shaft segment A fixed on the connecting rod A by the multi-ball sleeve;
the driven friction wheel driven by the driving friction wheel rotates around the pendulum bar of the driven friction wheel; one end of the pendulum bar of the driven friction wheel is fixed, and the other end pulls the driven friction wheel to the driving friction wheel by the tension spring; therefore, a suitable friction force is generated between the two friction wheels, which drives the two friction wheels to rotate in opposite directions; one end of connecting rod B rotates around the rotary center of the pendulum bar of the driven friction wheel and the rotary center of connecting rod B coincides with the rotary center of the driven belt pulley and the driven friction wheel; the other end of the connecting rod B is connected to the rotation shaft segment B, and the mutual-lapping gear B rotates with the rotation shaft segment B fixed on the connecting rod B by the multi-ball sleeve.

2. The mutual-lapping device for improving gear machining accuracy according to claim 1 , wherein the pressure spring is used to ensure that the force between the transmission belt A and transmission belt B is equal, and by adjusting the position of the tensioner mechanism, the tensioning force of the transmission belt A and transmission belt B can be synchronously adjusted.

3. The mutual-lapping device for improving gear machining accuracy according to claim 1 , wherein the center distance of the driving belt pulley and the driven belt pulley is smaller than the center distance of mutual-lapping gear A and mutual-lapping gear B so that the two mutual-lapping gears are pressed against each other by gravity and realizing the backlash-free meshing transmission of the two mutual-lapping gears.

4. The mutual-lapping device for improving gear machining accuracy according to claim 3 , wherein the transmission ratio of the two belt drives is consistent with the transmission ratio of the mutual-lapping gear, and the relative error of the transmission ratio is no more than 2%.

5. The mutual-lapping device for improving gear machining accuracy according to claim 3 , wherein the mutual-lapping device is mounted on an inclined table at tilt angle of 70°˜80° to the horizontal plane, and the two mutual-lapping gears are pressed against the table surface by gravity so that the axial location datum of two mutual-lapping gears is coplanar; the rotary center of the two mutual-lapping gears fluctuates, and the center distance is adjusted automatically according to the deviation of mutual-lapping gears.

6. The mutual-lapping device for improving gear machining accuracy according to claim 1 , wherein the transmission ratio of the two belt drives is consistent with the transmission ratio of the mutual-lapping gear, and the relative error of the transmission ratio is no more than 2%.

7. The mutual-lapping device for improving gear machining accuracy according to claim 6 , wherein the mutual-lapping device is mounted on an inclined table at tilt angle of 70°˜80° to the horizontal plane, and the two mutual-lapping gears are pressed against the table surface by gravity so that the axial location datum of two mutual-lapping gears is coplanar; the rotary center of the two mutual-lapping gears floats, and the center distance is adjusted automatically according to the deviation of mutual-lapping gears.

8. The mutual-lapping device for improving gear machining accuracy according to claim 1 , wherein the mutual-lapping device is mounted on an inclined table at tilt angle of 70°˜80° to the horizontal plane, and the two mutual-lapping gears are pressed against the table surface by gravity so that the axial location datum of two mutual-lapping gears is coplanar; the rotary center of the two mutual-lapping gears fluctuates, and the center distance is adjusted automatically according to the deviation of mutual-lapping gears.

9. A mutual-lapping method using the mutual-lapping device for improving gear machining accuracy according to claim 1 , wherein dividing the rotational motion of motor into the two opposite rotation motions of the driving belt pulley and the driven belt pulley by precision driving friction wheel and derived friction wheel, and then driven the mutual-lapping gear A and the mutual-lapping gear B by belt drive respectively to ensure the transmission ratio of the two belt drives is consistent with the transmission ratio of the mutual-lapping gear, and the relative error of the transmission ratio is no more than 2%; the operation steps of the mutual-lapping method are as follows:
(1) number each tooth of the mutual-lapping gear A and the mutual-lapping gear B, and then configure grinding fluid with suitable particle size;
(2) first, the left or right tooth flank of the No. 1 tooth of the mutual-lapping gear A is meshed with the left or right tooth flank of the No. 1 tooth of the mutual-lapping gear B, and the mutual-lapping gears are automatically anti-backlash by gravity;
(3) turn off the motor after the motor rotating forward and reversal alternately for a period of time t;
(4) pull out one side of the connecting rod A or the connecting rod B to disengage the two mutual-lapping gears from the engaging state while the driving belt and the driven belt are relaxed;
(5) rotate at the angle of one tooth of any mutual-lapping gears and put down the connecting rod A or connecting rod B so that the mutual-lapping gear A meshes with the mutual-lapping gear B again while the two pulleys are in tension;
(6) start the motor and continue lapping according to the operation method in step 3 and make sure that the each mutual-lapping time t and the mutual-lapping strategy stay the same;
(7) repeat steps (4)-(6) until a mutual-lapping cycle T, that is, one tooth flank meshes with all the same side tooth flank of the mutual-lapping gear;
(8) repeat the above steps to complete an even times of mutual-lapping cycles 2kT, where k is an integer greater than 1.

Assignees

• Univ Dalian Tech

Inventors

• Ling siying
• Wang Xunlian
• Ling Ming
• Chen Yilei
• Zhang Huiyang
• Wang Xiaodong
• Wang Liding

Classifications

• B23F19/02 Primary

  Lapping gear teeth · CPC title

• B23F1/02

  by grinding · CPC title

• Y10T29/49462

  Gear making · CPC title

• Y10T29/49467

  Gear shaping · CPC title

• B23F15/00

  Methods or machines for making gear wheels of special kinds not covered by groups B23F7/00 - B23F13/00 · CPC title