Processing method of high-speed precise transmission herringbone gear pair and gear thereof

Abstract

The application discloses a machining method for high-speed precise transmission herringbone gear pair, which comprises the following steps: machining process hole A on the left-hand helical gear part and process hole B on the right-hand helical gear part; the centers of the process hole A and the process hole B are respectively centered with the tooth top center of the reference tooth J on the corresponding helical gear part; after the assembly of the connecting part A and the connecting part B, process pin hole C and process pin hole D are machined; the center lines of the process pin hole C and the process pin hole D are coaxial and parallel to the center lines of the connecting part A and the connecting part B; the sizes of the process hole A, the process hole B, the process pin hole C and the process pin hole D are consistent; the center distances from the centers of the four holes to the centers of the corresponding helical gear parts and the corresponding connecting parts are consistent; after the process hole A is connected with the process pin hole C and the process hole B is connected with the process pin hole D, the left-hand helical gear part and the right-hand helical gear part are precisely ground. The method only needs to be centered and measured once, thereby avoiding the accumulated errors and artificial errors generated in the multiple alignment processes.

Description

Technical Field

[0001] This invention relates to a machining method for high-speed precision transmission herringbone gears and the gear thereof, belonging to the field of herringbone gear machining technology. Background Technology

[0002] With the continuous development of modern industrial technology, the performance requirements for planetary transmission systems are becoming increasingly stringent. Among them, the herringbone planetary transmission, due to its unique structure, is a symmetrical structure composed of two perfectly symmetrical helical gears. The herringbone planetary transmission structure has advantages such as low vibration and impact, low noise, and the ability to self-balance the axial component of the helical gears, resulting in stronger gear load-bearing capacity and smoother transmission. It is widely used in aerospace, shipbuilding, mining, metallurgy and other industries.

[0003] The existing technical requirements for centering error are as follows: low precision centering error ≥ 0.5 mm; high precision centering error ≤ 0.2 mm < 0.5 mm; high precision centering error < 0.2 mm; ultra-high precision centering error < 0.05 mm.

[0004] Some high-speed, high-precision special herringbone planetary transmission structures, to ensure transmission stability while also meeting the structural characteristics of the gearbox, consist of only two completely symmetrical helical gears with opposite left and right helical directions. Due to limitations in manufacturing processes, the machining of such herringbone gears typically involves machining one component first for herringbone alignment, correcting the alignment error, and then machining the other component. After machining and a second correction of the herringbone alignment error, the two components are assembled, and the herringbone alignment error is rechecked. This method, through multiple herringbone alignment and error rechecks, ensures that the left-hand and right-hand helical gear components meet the design requirements. While this method has some universality for tooling internal herringbone gear rings, cumulative and human errors can still occur during multiple alignments and rechecks. If the result of an alignment or recheck is affected by cumulative and human errors, it will affect subsequent alignment and recheck results and the precision of the final product, making it difficult to achieve high-precision alignment error requirements. Summary of the Invention

[0005] This invention provides a machining method for centering high-speed precision transmission herringbone teeth, which eliminates the error caused by multiple centering and re-inspection in the prior art, thus avoiding the impact on the centering accuracy of the herringbone teeth, and produces herringbone teeth with high centering accuracy.

[0006] To achieve the above objectives, the technical solution adopted by this invention is: a machining method for centering high-speed precision transmission herringbone gears, comprising the following steps: machining process holes A on the end face of the assembly hole of a left-hand helical gear and machining process holes B on the end face of the assembly hole of a right-hand helical gear; the centers of process holes A and B are respectively aligned with the tooth tip center of the reference tooth J on the corresponding helical gear; after assembling connector A and connector B, machining process pin holes C on connector A and D on connector B; the center lines of process pin holes C and D are coaxial and parallel to the center lines of connector A and connector B; the dimensions of process holes A, B, C, and D are consistent; and the center distances from the centers of the four to the centers of the corresponding helical gear and the corresponding connector are consistent; after connecting process holes A and C, and process holes B and D, precision grinding is performed on the left-hand and right-hand helical gears.

[0007] Furthermore, before machining process hole A on the end face of the left-hand helical gear assembly hole and process hole B on the end face of the right-hand helical gear assembly hole, preliminary machining is performed on the left-hand helical gear and the right-hand helical gear respectively. The preliminary machining includes machining the inner hole and the tooth portion on the left-hand helical gear and the right-hand helical gear. During the preliminary machining, the inner hole, tooth width and axial positioning dimensions are kept consistent.

[0008] Furthermore, the machining of the teeth specifically involves: rough grinding the outer teeth of the left-hand helical gear and the right-hand helical gear, leaving a margin.

[0009] Furthermore, connector A and connector B are webs, and their axial positioning dimensions are the same.

[0010] Furthermore, a fixed shaft is used to assemble connector A and connector B, and the fixed shaft is coaxial with connector A and connector B.

[0011] Furthermore, cylindrical pins are used to connect process holes A and C, and process holes B and D.

[0012] The purpose of this invention is to provide a machining method for aligning stable herringbone gears in high-speed precision transmission. The method involves first machining two helical gear rings separately, then machining two process holes on each ring to ensure the holes are positioned to meet the alignment requirements of the gear teeth. Next, the method involves machining the parts connected to the helical gear rings, ensuring the coaxiality of these pin holes during machining. Finally, the two helical gear rings and the connected parts are assembled, positioned using tooling pins, and the teeth are precision ground. This simplifies the difficult machining of the herringbone teeth on the two independently machined helical gear rings to the alignment of the process holes on the two gear rings and the two connecting parts. This method requires only one alignment measurement, avoiding cumulative and human errors from multiple alignment processes, and eliminates the need for coordinate measuring machines (CMMs), achieving an alignment error of 0.1-0.15 mm.

[0013] The method of this invention can improve work efficiency and ensure that the herringbone tooth parts meet the alignment accuracy requirements of the drawings. Attached Figure Description

[0014] Figure 1 A flowchart illustrating a machining method for centering high-speed precision transmission herringbone gears, provided in an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the midpoint of the tooth width of the left-hand helical gear and the right-hand helical gear in this invention; Figure 3 This is a schematic diagram of the connector assembly in this invention; Figure 4 This is a schematic diagram of the opening in the connector of the present invention.

[0015] Among them, 1-left-hand helical gear, 101-process hole A, 2-right-hand helical gear, 201-process hole B, 3-connector A, 301-process pin hole C, 4-connector B, 401-process pin hole D, 5-fixed shaft. Detailed Implementation

[0016] To better understand the essence of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0017] This invention is applicable to the machining of the external teeth of a combined herringbone gear ring comprising a left-hand helical gear and a right-hand helical gear, with a connecting member between the left-hand and right-hand helical gears. Specifically, it relates to a machining method for centering high-speed precision transmission herringbone teeth, comprising the following steps: Step 1: Machining the left-hand helical gear 1 and the right-hand helical gear 2 respectively. When machining the left-hand helical gear 1 and the right-hand helical gear 2, ensure that the inner hole, tooth width and axial positioning dimensions on the left-hand helical gear 1 and the right-hand helical gear 2 are consistent.

[0018] Step 2: Roughly grind the outer teeth of the left-hand helical gear 1 and the right-hand helical gear 2 until the tooth surfaces are rounded and allowance is left.

[0019] Step 3: Machining process hole A101 on the end face of the vertical hole of left-hand helical gear 1, and machining process hole B201 on the end face of the vertical hole of right-hand helical gear 2; the centers of process holes A101 and B201 are respectively aligned with the tooth tip center of the reference tooth J on left-hand helical gear 1 and right-hand helical gear 2; the dimensions of process holes A101 and B201 are consistent; the center distance a1 from process hole A101 to left-hand helical gear 1 is consistent with the center distance a1' from process hole B201 to right-hand helical gear 2, i.e., a1=a1'. The correspondence between the two gear rings and the two process holes is as follows. Figure 2 As shown. The specific value of the center distance a1 is 166 (+0.025 / -0.025).

[0020] Step four: Machining connector A3 and connector B4. When machining connector A3 and connector B4, ensure that their axial positioning dimensions are consistent. In a preferred embodiment of the present invention, connector A3 and connector B4 are web plates.

[0021] After the machined connectors A3 and B4 are assembled with the fixed shaft 5, their outer diameters and end faces are ground to ensure that the outer diameters of connectors A3 and B4 are coaxial and have consistent dimensions.

[0022] After grinding the outer diameter, connectors A3 and B4 remain assembled with the fixed shaft 5. A process pin hole C301 is machined on connector A3, and a process pin hole D401 is machined on connector B4. The center lines of process pin holes C301 and D401 are coaxial and parallel to the center lines of connectors A3 and B4. The dimensions of process holes A101, B201, C301, and D401 are consistent. Figure 3 As shown.

[0023] The center distance b1 between process pin hole C301 and connector A3 is consistent with the center distance b1' between process pin hole D401 and connector B4, and also consistent with center distances a1 and a1', i.e., a1=a1'=b1=b1'. The correspondence between process pin hole C301 and process pin hole D401 is as follows: Figure 4 As shown.

[0024] Step 5: Connect process hole A101 and process pin hole C301, process hole B201 and process pin hole D401 respectively, thereby assembling the left-hand helical gear 1, the right-hand helical gear 2, connector A3 and connector B4, as follows. Figure 1 As shown; after assembly, the teeth are precision ground. Matching cylindrical pins can be used to connect process holes A101 and C301, and process holes B201 and D401.

[0025] The centering error of the herringbone teeth obtained by the above method is between 0.1 and 0.15 mm.

[0026] This invention simplifies the difficult machining of the herringbone teeth of two independently machined helical gear rings to the alignment of the process holes on the two gear rings and two connecting parts; and uses tooling pins to position and connect the process pin holes on the two coaxial connecting parts to the process holes on the two helical gear rings respectively, avoiding the cumulative alignment deviation caused by multiple alignments of the herringbone teeth of the two helical gear rings, thereby achieving precise alignment of the herringbone teeth.

[0027] The method of this invention can guarantee the centering accuracy requirement by centering the herringbone teeth in only one measurement, avoiding the cumulative error and human error generated in multiple alignment processes. Moreover, the whole process is simple, easy to manufacture, and greatly improves work efficiency.

[0028] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A machining method for centering high-speed precision transmission herringbone gears, characterized in that, Includes the following steps: Process hole A (101) is machined on the end face of the assembly hole of the left-hand helical gear (1), and process hole B (201) is machined on the end face of the assembly hole of the right-hand helical gear (2); the centers of process hole A (101) and process hole B (201) are respectively aligned with the tooth tip center of the reference tooth J on the corresponding helical gear. After assembling connector A (3) and connector B (4), process pin holes C (301) are machined on connector A (3), and process pin holes D (401) are machined on connector B (4); the center lines of process pin holes C (301) and process pin holes D (401) are coaxial and parallel to the center lines of connector A (3) and connector B (4); The dimensions of process hole A (101), process hole B (201), process pin hole C (301) and process pin hole D (401) are the same; and the center distance from the center of each of the four to the center of their respective helical gear or the center of their respective connecting parts is the same. After connecting the process hole A (101) with the process pin hole C (301), and the process hole B (201) with the process pin hole D (401), the left-hand helical gear (1) and the right-hand helical gear (2) are precision ground.

2. The processing method according to claim 1, characterized in that, Before machining process hole A (101) on the end face of the assembly hole of the left-hand helical gear (1) and process hole B (201) on the end face of the assembly hole of the right-hand helical gear (2), the left-hand helical gear (1) and the right-hand helical gear (2) are respectively processed. The preliminary processing includes machining the inner hole and the tooth on the left-hand helical gear (1) and the right-hand helical gear (2). When performing the preliminary processing, the inner hole, tooth width and axial positioning dimensions are kept consistent.

3. The processing method according to claim 2, characterized in that, The specific processing of the teeth involves rough grinding of the outer teeth of the left-hand helical gear (1) and the right-hand helical gear (2), leaving a margin.

4. The processing method according to claim 1, characterized in that: The center distance is 166±0.

025.

5. The processing method according to claim 1, characterized in that: The connecting piece A (3) and connecting piece B (4) are webs, and their axial positioning dimensions are the same.

6. The processing method according to claim 1, characterized in that: Connector A (3) and connector B (4) are assembled using a fixed shaft (5), which is coaxial with connector A (3) and connector B (4).

7. The processing method according to claim 1, characterized in that: Cylindrical pins are used to connect process holes A (101) and C (301), and process holes B (201) and D (401).

8. A high-speed precision transmission herringbone gear, characterized in that, It is prepared by the processing method described in any one of claims 1 to 7.

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