Gearbox with vibration reduction and noise reduction

Abstract

A gearbox with vibration reduction and noise reduction includes a first surrounding wall, a second surrounding wall, and a base wall. The first surrounding wall surrounds a center line, and the second surrounding wall extends from the inside of the first surrounding wall toward the center line. The base wall connects the first surrounding wall and the second surrounding wall on the same side along the extension direction of the center line. The base wall includes a corresponding perforation located on the inside of the second surrounding wall. The thickness of at least a portion of the base wall and the second surrounding wall is modified according to a machining model to reduce the resonant frequency and reduce vibration and noise generated by vibration.

Claims

1. A gearbox with vibration reduction and noise reduction, comprising: a first surrounding wall surrounding a center line; a second surrounding wall extending from the inside of the first surrounding wall toward the center line; and a base wall connecting the first surrounding wall and the second surrounding wall on the same side along the extension direction of the center line, the base wall including a corresponding perforation located inside the second surrounding wall, the thickness of at least a portion of the base wall and the second surrounding wall being modified according to a machining model to reduce the resonant frequency.

2. The gearbox with vibration reduction and noise reduction as described in claim 1, wherein, The second surrounding wall includes a first segment, a second segment, a third segment, and a fourth segment connected sequentially around the center line. The base wall also includes a first base, a second base, a third base, and a fourth base located inside the second surrounding wall and respectively corresponding to the first segment, the second segment, the third segment, and the fourth segment. The perforation is located in the first base. The thickness of at least one of the first segment, the second segment, the third segment, the fourth segment, the first base, the second base, the third base, and the fourth base is adjusted according to the processing model.

3. The gearbox with vibration reduction and noise reduction as described in claim 2, wherein, The thickness of the first base is the distance from one side of the adjacent second surrounding wall to the side opposite to the second surrounding wall along the extension direction of the center line. The thickness of the second base is the distance from one side of the adjacent second surrounding wall to the side opposite to the second surrounding wall along the extension direction of the center line. The thickness of the third base is the distance from one side of the adjacent second surrounding wall to the side opposite to the second surrounding wall along the extension direction of the center line. The thickness of the fourth base is the distance from one side of the adjacent second surrounding wall along the extension direction of the center line. The thickness of the first segment is the distance extending to the side of the second surrounding wall opposite to the base wall. The thickness of the first segment is the distance extending from the side of the adjacent center line to the first surrounding wall in a direction perpendicular to the center line. The thickness of the second segment is the distance extending from the side of the adjacent center line to the first surrounding wall in a direction perpendicular to the center line. The thickness of the third segment is the distance extending from the side of the adjacent center line to the first surrounding wall in a direction perpendicular to the center line. The thickness of the fourth segment is the distance extending from the side of the adjacent center line to the first surrounding wall in a direction perpendicular to the center line.

4. The gearbox with vibration reduction and noise reduction as described in claim 1, wherein, The manufacturing model is derived from a method for fabricating a vibration-damping and noise-reducing gearbox, which includes the following steps: (A) fabricating a gearbox system based on a design model; (B) scanning the gearbox system to obtain a digitized gearbox model and a digitized gear set model, the gearbox model including a bottom wall, an outer surrounding wall connecting the periphery of the bottom wall and surrounding an axis, an inner surrounding wall extending from the outer surrounding wall toward the axis and surrounding the axis, and an output hole located on the bottom wall; (C) performing resonant frequency analysis on the gearbox model and the gear set model to obtain at least one modal model corresponding to the gearbox model, the at least one modal model having multiple nodes and multiple resonant frequencies corresponding to the nodes; (D) performing acoustic field analysis on the gearbox model and the gear set model to obtain an initial average noise. (E) For the nodes in the at least one modal model whose resonant frequencies are greater than a predetermined resonant frequency, record all regions corresponding to the outer and inner surrounding walls as a region to be modified; (F) Increase the wall thickness of the gearbox model corresponding to the region to be modified to obtain a thickened model, and perform acoustic field analysis on the thickened model and the gear set model to obtain a thickened average noise; (G) Decrease the wall thickness of the gearbox model corresponding to the region to be modified to obtain a thinned model, and perform acoustic field analysis on the thinned model and the gear set model to obtain a thinned average noise. And (H) The difference between the model corresponding to the lowest of the thickened average noise and the thinned average noise compared to the initial average noise and the gearbox model is recorded as the machining model.

5. The gearbox with vibration reduction and noise reduction as described in claim 4, wherein, The method for manufacturing the gearbox with vibration reduction and noise reduction also includes a step (I), in which one of the design model and the gearbox system is modified according to the machining model.

6. The gearbox with vibration reduction and noise reduction as described in claim 4, wherein, The bottom wall has a first wall area, a second wall area, a third wall area, and a fourth wall area connected sequentially around the axis. The inner surrounding wall has a first enclosure wall area, a second enclosure wall area, a third enclosure wall area, and a fourth enclosure wall area corresponding to the first wall area, the second wall area, the third wall area, and the fourth wall area, respectively. The output hole is located in the first wall area. The area to be modified corresponds to at least one of the first wall area, the second wall area, the third wall area, the fourth wall area, the first enclosure wall area, the second enclosure wall area, the third enclosure wall area, and the fourth enclosure wall area.

7. The gearbox with vibration reduction and noise reduction as described in claim 6, wherein, The gearbox model corresponds to the following wall thickness: the first wall region is the distance extending along the axis from one side of the adjacent inner surrounding wall to the opposite side of the bottom wall from the side of the inner surrounding wall. The second wall region corresponds to the same distance extending along the axis from one side of the adjacent inner surrounding wall to the opposite side of the bottom wall from the side of the inner surrounding wall. The third wall region corresponds to the same distance extending along the axis from one side of the adjacent inner surrounding wall to the opposite side of the bottom wall from the side of the inner surrounding wall. The fourth wall region corresponds to the same distance extending along the axis from one side of the adjacent inner surrounding wall to the opposite side of the bottom wall from the side of the inner surrounding wall. The distance from the bottom wall to the side opposite to the inner surrounding wall, the thickness of the gearbox model corresponding to the first surrounding wall area is the distance from the side of the first surrounding wall area extending perpendicular to the axis to the outer surrounding wall, the thickness of the gearbox model corresponding to the second surrounding wall area is the distance from the side of the second surrounding wall area extending perpendicular to the axis to the outer surrounding wall, the thickness of the gearbox model corresponding to the third surrounding wall area is the distance from the side of the third surrounding wall area extending perpendicular to the axis to the outer surrounding wall, and the thickness of the gearbox model corresponding to the fourth surrounding wall area is the distance from the side of the fourth surrounding wall area extending perpendicular to the axis to the outer surrounding wall.

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