CN104633049A - Laminated gear with variable tooth thickness - Google Patents

Abstract

The invention discloses a laminated variable-tooth-thickness gear. The gear is formed by sequentially stacking several tooth plates with thickened tooth shapes. The tooth plates include external tooth plates arranged at both ends of the There are several inner gears between the outer gears at both ends. The thickness of the outer gears is greater than that of the inner gears. There are vibration-reducing and noise-reducing pieces embedded between the gears. The diameter of the root circle increases or decreases along the axial direction of the gear, and the internal and external tooth plates and the vibration and noise reduction plates form a radial displacement external gear structure with variable tooth thickness. The invention adopts the lamination method to form the variable-tooth-thickness gear, and the gear processing technology is good. The vibration-reducing and noise-reducing plates are embedded between the tooth plates, which can suppress the meshing vibration of the gears from the root, reduce the transmission noise, and prolong the service life of the gear pair. .

Description

Stacked variable tooth thickness gear

technical field

The invention relates to the technical field of gear transmission, in particular to a laminated variable-tooth-thickness gear, which has a complete radial-displacement external gear structure with variable tooth thickness.

Background technique

As an important transmission part of the modern automobile industry, the gearbox is one of the main sources of vibration and noise during the operation of the automobile, and its working performance has an important impact on the entire vehicle. Car manufacturers also attach great importance to reducing the vibration and noise of the gearbox, and regard it as a highlight of new cars. Gear meshing generates vibration, which is transmitted to the gear box through the shaft and bearing housing, causing the box to vibrate and radiate noise at the same time. The vibration of the gear meshing interface is the decisive excitation of structural noise. How to suppress the vibration generated by the meshing and reduce the noise from the root has important engineering application value.

For gears with variable tooth thickness, the displacement coefficient changes according to a certain rule along the axial direction, and the tooth shape forms a certain taper in the axial direction. By adjusting its axial displacement, the meshing backlash can be adjusted to achieve the purpose of backlash adjustment or backlash elimination, and realize precision transmission. Therefore, it has broad application prospects in precision robots and precision servo transmissions. But this kind of gear is difficult to process, and there is no machine tool designed according to its forming principle, and the production cost is very high. Therefore, solving the processing problem under the existing domestic processing level is of great significance for promoting the application of this kind of gear. On the other hand, the variable-tooth-thickness gears in the prior art all adopt an integral structure, and the vibration noise generated by the gear meshing is relatively large. Solving the noise problem of the variable-tooth-thickness gear is also of great significance for popularizing the application of such gears.

Contents of the invention

The object of the present invention is to provide a laminated variable-tooth-thickness gear that is easy to process and has low meshing noise to solve the problem of difficult machining of variable-tooth-thickness gears in the prior art and high meshing noise of the variable-tooth-thickness gears in the prior art.

The technical solution adopted by the present invention to solve the above technical problems is a laminated gear with variable tooth thickness. It includes external gears located at both ends of the gear in the axial direction and a number of internal gears between the two external gears. The thickness of the outer gears is greater than that of the inner gears. Adjacent gears are embedded with reducing gears. Vibration and noise reduction sheet, the center of the tooth sheet is provided with a shaft hole, and a number of fixing holes are provided around the shaft hole for fixing the tooth sheet. The diameter of the addendum circle and the diameter of the tooth root circle of the tooth sheet are along the same axis Incremental or decremental, the internal and external tooth plates and vibration and noise reduction plates form a complete structure of variable tooth thickness radial displacement external gear. The tooth-thickness variable gear of the present invention is formed by superimposing several tooth plates with thickened tooth shapes. The tooth plates include external tooth plates and internal tooth plates, and one external tooth plate is respectively arranged on the two axial ends of the gear. A number of internal gears are arranged between the outer gears, and vibration-reducing and noise-reducing plates are embedded between adjacent gears. The basic structure of the vibration-damping and noise-reducing plates matches the gears. It is connected and fixed by screws or rivets in the fixing holes, so as to form a complete laminated radial displacement variable tooth thickness gear. The variable-tooth-thickness gear is formed by lamination. Because the thickness of a single tooth is small, it is easy to meet the processing requirements. The gear processing is good. The application of a simple process can complete the hard tooth surface and high-precision variable-tooth-thickness gear processing. The problem of difficult processing of the variable tooth thickness gear in the prior art is solved, and the bearing capacity and running precision of the transmission device can be improved. The thickened tooth profile here means that the tooth thickness of the gear teeth on the gear piece gradually increases from one side of the gear piece to the other side in the axial direction of the gear. In addition, vibration-reducing and noise-reducing sheets are embedded between adjacent tooth pieces in the present invention. The vibration-damping and noise-reducing sheets have high damping characteristics, and they are embedded between the tooth pieces, which can effectively suppress the vibration caused by gear meshing. That is to reduce the meshing vibration of the gears from the root, reduce the transmission noise, and thus reduce the noise. Therefore, the structure of the present invention can solve the problem of high meshing noise of variable-tooth-thickness gears in the prior art, and can also prolong the service life of the gear pair, and is especially suitable for high-precision transmission devices.

Preferably, the teeth of the gear are straight teeth or helical teeth, and the coefficient of variation of the gear changes linearly along the gear axis.

As a preference, the thickness of all the internal tooth plates is equal, the thickness of all the vibration damping and noise reduction plates is equal and glued to the adjacent tooth plates, and the thickness of the vibration damping and noise reduction plates is 15% to 30% of the thickness of the internal tooth plates , the thickness of the outer gear is equal and its thickness is 3 to 5 times the thickness of the inner gear. On the basis of being fixed by screws or rivets, the gear plate of the present invention is glued to adjacent vibration and noise reduction plates, so that the overall strength of the gear can be improved. For the vibration and noise reduction sheets of the same material, a larger thickness can improve the vibration and noise reduction effect, but it will affect the overall strength of the gear; if the thickness of the vibration and noise reduction sheets is too small, the vibration and noise reduction effect will be poor , usually the thickness of the vibration damping and noise reduction sheet is 15% to 30% of the thickness of the inner tooth sheet is more appropriate, this value can also be considered comprehensively according to the actual needs of gears in different working conditions and the noise reduction characteristics of vibration and noise reduction sheets of different materials select. In addition to the function of the gear, the outer tooth plate of the present invention also undertakes the function of pressing the inner tooth plate and the vibration and noise reduction plate. Therefore, the thickness of the outer tooth plate is usually larger than that of the inner tooth plate, which can also ensure the stability of the gear. Edge strength to avoid cracking or curling of the outermost cogs.

The gear plate and the vibration and noise reduction plate of the present invention can also adopt the following several further improved structural forms:

1. The thickness of all internal gears is equal, and all vibration damping and noise reduction plates are glued to the adjacent gears. The thickness of the vibration and noise reduction plates on the side of the thicker inner gear is greater than that on the side of the smaller tooth. The thickness of the vibration damping and noise reduction sheet on the side of the inner gear, the thickness of the vibration and noise reduction sheet changes linearly along the gear axis, the minimum thickness of the vibration and noise reduction sheet is 15% to 20% of the thickness of the inner tooth, The maximum thickness of the vibration and noise reduction sheet is 25% to 30% of the thickness of the internal tooth sheet, and the thickness of the external tooth sheet is equal and 3 to 5 times that of the internal tooth sheet. In this technical solution, the thickness of each internal gear in the gear is equal, and the thickness of the vibration and noise reduction plates is different. The thickness of the vibration-damping and noise-reducing sheet on the side of the smaller inner tooth sheet is smaller, and the thickness of the vibration-damping and noise-reducing sheet changes linearly along the gear axis. This is because the internal tooth plate with a thicker tooth thickness has a relatively larger external dimension, and its resonant frequency is lower at the same thickness, while the thicker vibration and noise reduction plate has a better effect on vibration with a lower frequency. Attenuation ability, so that the vibration suppression frequency band of the gear can be widened without increasing the overall thickness of the vibration and noise reduction sheet, and the transmission noise of the gear can be reduced, thereby reducing noise.

2. The thickness of the internal tooth plate with smaller tooth thickness is greater than the thickness of the internal tooth plate with large tooth thickness. The thickness of the maximum thickness internal tooth plate is 1.5 to 2 times the thickness of the minimum thickness internal tooth plate. The thickness of the internal tooth plate It changes linearly along the gear axis. The thickness of all vibration damping and noise reduction plates is equal and glued to the adjacent tooth plates. The thickness is equal and its thickness is 2 to 3 times of the thickness of the largest internal gear. In this technical solution, the thicknesses of the vibration-reducing and noise-reducing plates in the gear are equal, while the thicknesses of the internal tooth plates are different. Smaller, this is because the outer dimension of the inner gear with a smaller tooth thickness is relatively small, and its resonance frequency is higher under the same thickness. Properly increasing the thickness can reduce the resonance frequency and avoid the excessive noise frequency band of the gear , which is conducive to the use of a single damping characteristic of the vibration and noise reduction sheet to eliminate the transmission noise of the gear, thereby reducing the noise.

3. The thickness of the internal tooth plate with smaller tooth thickness is greater than the thickness of the internal tooth plate with larger tooth thickness. The thickness of the maximum thickness internal tooth plate is 1.5 to 2 times the thickness of the minimum thickness internal tooth plate. The thickness of the internal tooth plate It changes linearly along the gear axis; all the vibration damping and noise reduction plates are glued to the adjacent tooth plates, and the thickness of the vibration and noise reduction plates on the side of the inner tooth plate with larger tooth thickness is greater than that of the inner tooth plate with smaller tooth thickness. The thickness of the vibration and noise reduction sheet on one side of the gear, the thickness of the maximum thickness of the vibration and noise reduction sheet is 1.5 to 2 times the thickness of the minimum thickness of the vibration and noise reduction sheet, and the thickness of the vibration and noise reduction sheet is along the axis of the gear. Linear change, the maximum thickness of the vibration and noise reduction sheet is 15% to 30% of the thickness of the largest internal tooth sheet, the thickness of the external tooth sheet is equal and its thickness is 2 to 3 times the thickness of the largest internal tooth sheet. This technical solution is a comprehensive solution of the aforementioned two solutions 1 and 2. Its working principle is basically the same, and its structure is relatively complicated, but it has a better vibration and noise reduction effect.

Preferably, the inner gear includes two different hardness inner gear structures, the difference in hardness between the two different hardness inner gears is 10% to 15% of the hardness value of the high hardness inner gear, and the two different hardness The internal gears are arranged alternately, the total number of the internal gears is an odd number, the hardness of the inner gears adjacent to the outer gears is higher than that of the adjacent inner gears, and the outer gears adopt a composite damping steel plate structure. The use of two internal gears with different hardness is conducive to the dispersion of the noise frequency points of the internal gears, thereby reducing the noise peak at the same frequency point, avoiding the concentration of noise frequencies at one frequency point, and reducing the maximum value of gear noise. The difference in hardness value here is 10% to 15% of the hardness value of the high-hardness internal gear, which is based on the hardness value of the high-hardness internal gear. The percentage of the difference between the values relative to the hardness value of the high-hardness inner gear. For example, when the hardness value of the high-hardness inner gear is HRC50, the hardness value of the low-hardness inner gear is HRC42.5-HRC45; Two kinds of inner gears with different hardness can be made of two materials with different hardness, or two different hardnesses can be obtained by the same material through different heat treatment methods; while the outer gear adopts composite damping steel plate structure, which can also effectively suppress vibration transmission, thereby reducing noise.

Preferably, each vibration and noise reduction sheet is made of a single damping material, and the gear is provided with two types of vibration and noise reduction sheets made of damping materials with different damping characteristics. The peak values of the loss factors of the two vibration and noise reduction sheets correspond to two Frequency, two kinds of vibration and noise reduction plates are alternately arranged between the teeth of the gear. For the above-mentioned gears using two kinds of inner gears with different hardness, the structure of this technical solution can be adapted to it, and two kinds of vibration and noise reduction plates with corresponding damping characteristics can be used to suppress the corresponding noise, which can achieve good noise reduction. noise effect.

The vibration and noise reduction sheet can also adopt the following structural forms:

1. Each vibration and noise reduction sheet is composed of a single damping material, and the gear is equipped with more than two vibration and noise reduction sheets composed of damping materials with different damping characteristics. The peak loss factor of each vibration and noise reduction sheet corresponds to a different Frequency, vibration and noise reduction plates with different damping characteristics are arranged alternately and circularly between the teeth of the gear. This technical solution is aimed at the situation of three or more types of vibration-reducing and noise-reducing plates whose total number is less than the number of gear gaps. This kind of vibration and noise reduction sheet adopts the arrangement of 1+2+3+1+2+3 in the axial direction of the gear. This arrangement of vibration and noise reduction sheets is mainly used to broaden the frequency suppression range of the vibration and noise reduction sheet , can be used in some gear transmission systems with large noise frequency range.

2. Each vibration and noise reduction sheet is composed of a single damping material. The vibration and noise reduction sheets at different positions on the gear are composed of damping materials with different damping characteristics. The peak loss factor of each vibration and noise reduction sheet corresponds to different frequencies. The vibration and noise reduction plates with different damping characteristics are arranged in order in the axial direction of the gear according to the frequency corresponding to the peak value of the loss factor, and the peak value of the loss factor of the vibration and noise reduction plates that are close to the outer tooth plate with a smaller tooth thickness corresponds to The frequency is higher than the frequency corresponding to the peak value of the loss factor of the vibration and noise reduction sheet that is close to the thicker outer tooth sheet. This technical solution is to use the same number of gear gaps and different damping characteristics to suppress the gear noise. The setting scheme of this vibration and noise reduction sheet is mainly used to suppress the frequency of the widening vibration and noise reduction sheet. It can be used in some gear transmission systems with a large noise frequency range.

The vibration and noise reduction sheet of the present invention can use polymer damping materials or alloy damping materials. The peak values of loss factors of damping materials with different damping characteristics correspond to different frequencies, and there are many choices. For example, the corresponding frequency of EPDM rubber in polymer materials is about 750 Hz, that of butyl rubber is about 450 Hz, that of natural rubber is about 580 Hz, and that of 2-chloroprene-acrylonitrile copolymer is about 250 Hz; Polyacrylate, polyurethane, epoxy resin and nitrile rubber can be used. There are also many varieties of damping alloys, such as Al-Zn alloys, Mn-Cu alloys, Mg-Zi alloys, and Ni-Ti alloys. Iron-based damping alloys include Fe-Cr-Al, Fe-Al, Fe-Mo, Fe- Various high-damping alloy materials such as W, Fe-Cr-Mo, Fe-Cr-Co, the variety specifications and characteristics of vibration and noise reduction materials belong to the known technology, and can be selected according to the selection method disclosed in the present invention and according to the gear Or the actual working conditions of the gear system to select suitable materials to make vibration and noise reduction sheets.

Preferably, frequency fine-tuning holes are provided on the vibration-damping and noise-reducing sheets, and the number of frequency fine-tuning holes is 3 to 6, which are evenly arranged along the circumferential direction of the inner tooth sheet, and the frequency fine-tuning holes on two adjacent vibration-damping and noise-reducing sheets are misaligned set up. Setting the frequency fine-tuning hole on the vibration and noise reduction sheet can fine-tune the position of the peak point of the damping frequency corresponding to the vibration and noise reduction sheet, so that the vibration and noise reduction sheet can meet different frequency suppression requirements. The frequency fine-tuning hole can be set on part of the vibration and noise reduction sheet The noise plate can also be installed on all the vibration and noise reduction plates. When the frequency fine-tuning holes are set on two adjacent vibration and noise reduction plates, it should be avoided that the frequency fine-tuning holes appear on the same axial direction of the gear, that is, avoid part of the gear Cavities appear on both sides of the sheet at the same time to prevent new vibrations.

The processing method of the stacked variable tooth thickness gear of the present invention is as follows: process a plurality of thin metal sheets into thickened tooth pieces according to the specified tooth shape and size, align and stack the tooth pieces according to the specified order, and place them between the tooth pieces Glue the vibration and noise reduction plates, and press and fix all the tooth plates by setting screws or rivets in the fixing holes, and finally form a complete radial displacement external gear structure with variable tooth thickness.

The beneficial effects of the present invention are: it effectively solves the problem of difficult machining of variable-tooth-thickness gears in the prior art and the large meshing noise of the prior art variable-tooth-thickness gears; The gear is formed by the form of a piece, and the metal sheet of different materials, different thicknesses, and different heat treatment states can be used to finish machining to form the tooth piece. The gear processing technology is good, and the hard tooth surface and high-precision variable tooth thickness gear can be completed with a simple process. processing, so as to improve the bearing capacity and running accuracy of the transmission device; and the vibration-reducing and noise-reducing plates are embedded between the tooth plates, which can suppress the meshing vibration of the gears from the root, reduce the transmission noise, and prolong the service life of the gear pair, especially Suitable for high-precision transmission.

Description of drawings

Fig. 1 is a kind of structure schematic diagram of the stack type variable tooth thickness gear of the present invention;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a partial enlarged view of Fig. 2;

Fig. 4 is a structural schematic diagram of the vibration and noise reduction sheet of the present invention.

In the figure: 1. External gear, 2. Internal gear, 3. Vibration and noise reduction plate, 4. Shaft hole, 5. Fixing hole, 6. Frequency fine-tuning hole, 7. Rivet.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

Example 1

In the embodiment 1 shown in Fig. 1 and Fig. 2, a laminated tooth-thickness variable gear is composed of 11 tooth plates with the same number of teeth and thicker tooth shapes stacked sequentially. It includes the outer gears 1 located at both ends of the gear in the axial direction and 9 inner gears 2 between the two outer gears (see Figure 3). The thickness of all the inner gears is equal, and the thickness of the outer gears is equal to that of the inner teeth 4 times the thickness of the gears, and the vibration and noise reduction plates 3 are embedded between the adjacent tooth plates. Adjacent gears are bonded, the thickness of the vibration and noise reduction plate is 30% of the thickness of the inner gear, the center of the gear is provided with a shaft hole 4, and a number of fixing holes for fixing the gear are provided around the shaft hole 5. The diameter of the addendum circle and the diameter of the dedendum of the gears increase along the same axis of the gear, and the displacement coefficient of the gear changes linearly along the axis of the gear. The inner and outer gears and the vibration and noise reduction plates are set at The rivets 7 in the fixing holes are connected and fixed, and the inner and outer tooth plates and the vibration and noise reduction plates form a complete structure of variable tooth thickness radial displacement straight tooth external gear.

Example 2

The gear in Example 2 is a helical gear, and the thickness of the 7 internal tooth plates in the gear is equal, and the 8 vibration and noise reduction plates are glued to the adjacent tooth plates. The thickness of the vibration and noise reduction sheet is greater than the thickness of the vibration and noise reduction sheet on the side of the inner gear with a smaller tooth thickness. The thickness of the vibration and noise reduction sheet changes linearly along the gear axis. The minimum thickness of the vibration and noise reduction sheet It is 15% of the thickness of the inner gear, the maximum thickness of the vibration and noise reduction plate is 30% of the thickness of the inner gear, the thickness of the outer gear is equal and its thickness is 3 times the thickness of the inner gear, and the rest are the same as in Example 1 .

Example 3

In embodiment 3, the gear includes 8 internal tooth plates and 9 vibration-damping and noise-reducing plates. The internal tooth plates have different thicknesses, and the thickness of the internal tooth plate with smaller tooth thickness is greater than that of the internal tooth plate with larger tooth thickness. Thickness, the thickness of the maximum thickness internal gear is 1.8 times the thickness of the minimum thickness internal gear, the thickness of the internal gear changes linearly along the gear axis, and the thickness of all vibration and noise reduction plates is equal and the same as that of the adjacent gear Bonding, the thickness of the vibration and noise reduction sheet is 18% of the thickness of the largest internal tooth sheet, the thickness of the external tooth sheet is equal and its thickness is 2.5 times the thickness of the largest internal tooth sheet, and the rest are the same as in embodiment 1 or embodiment 2 .

Example 4

In embodiment 4, the gear includes 10 internal tooth plates and 11 vibration-damping and noise-reducing plates. The internal tooth plates have different thicknesses. Thickness, the thickness of the maximum thickness inner gear is 1.6 times the thickness of the smallest thickness inner gear, the thickness of the inner gear changes linearly along the gear axis; Bonding, the thickness of the vibration and noise reduction sheet on the side of the inner tooth with a larger tooth thickness is greater than the thickness of the vibration and noise reduction sheet on the side of the inner tooth with a smaller tooth thickness, the maximum thickness of the vibration and noise reduction sheet The thickness of the vibration and noise reduction sheet is 1.7 times the thickness of the minimum thickness of the vibration and noise reduction sheet. The thickness of the vibration and noise reduction sheet changes linearly along the gear axis. The thickness of tooth plate is equal and its thickness is 2 times of the thickness of maximum inner tooth plate, all the other are identical with embodiment 1 or embodiment 2.

Example 5

In Embodiment 5, the total number of gear internal gears is an odd number, including 11 internal gears and 12 vibration-damping and noise-reducing plates. The difference in hardness value of the inner gear is 10% of the hardness value of the high-hardness inner gear. Two kinds of inner gears with different hardness are arranged alternately. The hardness of the inner gear adjacent to the outer gear is higher than that of the adjacent inner gear. The tooth piece, the outer tooth piece adopts a composite damping steel plate structure. In this embodiment, two kinds of internal tooth plates with different hardnesses are obtained from the same material through different heat treatment methods, and two kinds of materials with different hardnesses can also be selected. Each vibration and noise reduction sheet in Example 5 is made of a single damping material, and the gear is provided with two types of vibration and noise reduction sheets made of damping materials with different damping characteristics. The peak values of the loss factors of the two types of vibration and noise reduction sheets correspond to two frequency, two kinds of vibration and noise reduction plates are arranged alternately between the teeth of the gear, and the rest are the same as in embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4.

Example 6

In embodiment 6, the gear includes 5 pieces of internal gears and 6 pieces of vibration and noise reduction pieces, each piece of vibration and noise reduction pieces is composed of a single damping material, and the gear is provided with three types of vibration damping components composed of damping materials with different damping characteristics. Noise reduction sheet, the peak loss factor of each type of vibration reduction and noise reduction sheet corresponds to the frequency, and vibration and noise reduction sheets with different damping characteristics are arranged alternately and circularly between the gear teeth. In this embodiment, there are three kinds of vibration-reducing and noise-reducing sheets, and the number of tooth gaps of the gear is six. The arrangement of the three kinds of vibration-damping and noise-reducing sheets in the axial direction of the gear is 1+2+3+1+2+3 Mode, all the other are identical with embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4.

Example 7

In Example 7, the gear includes 6 internal gears and 7 vibration and noise reduction plates, each vibration and noise reduction plate is made of a single damping material, and the vibration and noise reduction plates at different positions on the gear are made of different damping properties. It is made of damping material. The peak loss factor of each vibration and noise reduction sheet corresponds to different frequencies. The vibration and noise reduction sheets with different damping characteristics are arranged in order in the axial direction of the gear according to the frequency corresponding to the peak loss factor, which is related to the tooth thickness. The frequency corresponding to the peak value of the loss factor of the vibration-damping and noise-reducing disc with the smaller outer tooth plate is higher than the frequency corresponding to the peak value of the loss factor of the vibration-damping and noise-reducing disc close to the thicker outer tooth plate. All the other are identical with embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4.

Example 8

In Embodiment 8, frequency fine-tuning holes 6 (see Figure 4) are provided on the vibration-damping and noise-reducing plates. The frequency fine-tuning holes on the noise plate are misplaced. In this embodiment, the structural form of frequency fine-tuning holes provided on the vibration-damping and noise-reducing plate can be adopted on the vibration-damping and noise-reducing plate of any of the above-mentioned embodiments, that is, in the above-mentioned embodiments 1-7. Adopting the vibration-reducing and noise-reducing sheet with the frequency fine-tuning hole constitutes a new embodiment of the present invention, and the frequency-adjusting hole can be arranged on some vibration-reducing and noise-reducing sheets, and also can be arranged on all the vibration-reducing and noise-reducing sheets.

The vibration and noise reduction sheet of the present invention can use polymer damping materials or alloy damping materials. The peak values of loss factors of damping materials with different damping characteristics correspond to different frequencies, and there are many choices. For example, the corresponding frequency of EPDM rubber in polymer materials is about 750 Hz, that of butyl rubber is about 450 Hz, that of natural rubber is about 580 Hz, and that of 2-chloroprene-acrylonitrile copolymer is about 250 Hz; Polyacrylate, polyurethane, epoxy resin and nitrile rubber can be used. There are also many varieties of damping alloys, such as Al-Zn alloys, Mn-Cu alloys, Mg-Zi alloys, and Ni-Ti alloys. Iron-based damping alloys include Fe-Cr-Al, Fe-Al, Fe-Mo, Fe- Various high-damping alloy materials such as W, Fe-Cr-Mo, Fe-Cr-Co, the variety specifications and characteristics of vibration and noise reduction materials belong to the known technology, and can be selected according to the selection method disclosed in the present invention and according to the gear Or the actual working conditions of the gear system to select suitable materials to make vibration and noise reduction sheets.

The processing method of the stacked variable tooth thickness gear of the present invention is as follows: process a plurality of thin metal sheets into thickened tooth pieces according to the specified tooth shape and size, align and stack the tooth pieces according to the specified order, and place them between the tooth pieces Glue the vibration and noise reduction plates, and press and fix all the tooth plates by setting screws or rivets in the fixing holes, and finally form a complete radial displacement external gear structure with variable tooth thickness.

The tooth-thickness variable gear of the present invention is formed by superimposing several tooth plates with thickened tooth shapes, and the tooth plates include a number of internal tooth plates arranged between the outer tooth plates and the outer tooth plates on both ends of the axial direction of the gear. Vibration-reducing and noise-reducing sheets are embedded between adjacent gear pieces, and the inner and outer gear pieces and the vibration-damping and noise-reducing pieces are connected and fixed by screws or rivets in the fixing holes, thereby forming an integral variable-tooth-thickness gear. The variable-tooth-thickness gear is formed by lamination. Because the thickness of a single tooth is small, it is easy to meet the processing requirements. The gear processing is good. The application of a simple process can complete the hard tooth surface and high-precision variable-tooth-thickness gear processing. The problem of difficult machining of variable-tooth-thickness gears in the prior art is solved. In addition, vibration-reducing and noise-reducing sheets are embedded between adjacent tooth pieces in the present invention. The vibration-damping and noise-reducing sheets have high damping characteristics, and they are embedded between the tooth pieces, which can effectively suppress the vibration caused by gear meshing. That is to reduce the meshing vibration of the gears from the root, reduce the transmission noise, and thus reduce the noise. Therefore, the structure of the present invention can solve the problem of high meshing noise of variable-tooth-thickness gears in the prior art, and can also prolong the service life of the gear pair, and is especially suitable for high-precision transmission devices.

In addition to the above-mentioned embodiments, within the scope disclosed in the claims and description of the present invention, the technical features or technical data of the present invention can be re-selected and combined to form new implementations. These implementations of the present invention that have not been described in detail The method can be easily realized by those skilled in the art without creative work, so these implementations that are not described in detail should also be regarded as specific examples of the present invention and fall within the protection scope of the present invention.

Claims (10)

1. A laminated variable-tooth-thickness gear, characterized in that: the gear is composed of several tooth plates with the same number of teeth and thicker tooth shapes that are sequentially stacked, and the tooth plates include two gears located in the axial direction of the gear. The outer gear (1) at the end and several inner gears (2) located between the two outer gears, the thickness of the outer gears is greater than the thickness of the inner gears, and vibration-damping gears are embedded between adjacent gears The noise reduction piece (3), the center of the tooth piece is provided with a shaft hole (4), and a number of fixing holes (5) for fixing the tooth piece are arranged around the shaft hole. The diameter of the addendum circle and the root circle of the tooth piece are The diameters all increase or decrease along the same axis of the gear, and the internal and external tooth plates and the vibration and noise reduction plates form a complete radial displacement external gear structure with variable tooth thickness. 2 . The laminated variable tooth thickness gear according to claim 1 , wherein the teeth of the gear are straight teeth or helical teeth, and the displacement coefficient of the gear changes linearly along the gear axis. 3 . 3. The laminated variable-tooth-thickness gear according to claim 1, characterized in that: all internal gears have the same thickness, all vibration and noise reduction plates have the same thickness and are glued to adjacent gears, the The thickness of the damping and noise-reducing sheet is 15% to 30% of the thickness of the internal tooth sheet, and the thickness of the external tooth sheet is equal to and 3 to 5 times that of the internal tooth sheet. 4. The laminated tooth-thickness variable gear according to claim 1, characterized in that: the thickness of all internal tooth plates is equal, and all vibration and noise reduction plates are glued to adjacent tooth plates, and are located on the thicker tooth plate. The thickness of the vibration and noise reduction sheet on the side of the inner gear is greater than the thickness of the vibration and noise reduction sheet on the side of the inner tooth with smaller tooth thickness. The thickness of the vibration and noise reduction sheet changes linearly along the gear axis. The minimum thickness of the vibration and noise reduction sheet is 15% to 20% of the thickness of the internal tooth sheet, the maximum thickness of the vibration and noise reduction sheet is 25% to 30% of the thickness of the internal tooth sheet, and the thickness of the external tooth sheet is equal to that of the inner tooth sheet. 3 to 5 times the thickness of the gear. 5. The laminated variable-tooth-thickness gear according to claim 1, characterized in that: the thickness of the internal tooth plate with smaller tooth thickness is greater than the thickness of the internal tooth plate with larger tooth thickness, and the thickness of the maximum thickness internal tooth plate is It is 1.5 to 2 times the thickness of the smallest inner gear, and the thickness of the inner gear changes linearly along the gear axis. All the vibration and noise reduction plates have the same thickness and are glued to the adjacent gears to reduce vibration and noise. The thickness of the sheet is 10% to 20% of the thickness of the largest internal tooth sheet, and the thickness of the external tooth sheet is equal to and 2 to 3 times the thickness of the largest internal tooth sheet. 6. The laminated variable-tooth-thickness gear according to claim 1, characterized in that: the thickness of the internal tooth plate with smaller tooth thickness is greater than the thickness of the internal tooth plate with larger tooth thickness, and the thickness of the maximum thickness internal tooth plate is It is 1.5 to 2 times the thickness of the smallest inner gear, and the thickness of the inner gear changes linearly along the gear axis; all vibration and noise reduction plates are glued to adjacent gears, and are located on the inner teeth with larger tooth thickness The thickness of the vibration and noise reduction sheet on one side is greater than the thickness of the vibration and noise reduction sheet on the side of the inner tooth sheet with a smaller tooth thickness, and the thickness of the vibration and noise reduction sheet with the largest thickness is equal to that of the smallest thickness. 1.5 to 2 times the thickness, the thickness of the vibration damping and noise reduction sheet changes linearly along the gear axis, the maximum thickness of the vibration and noise reduction sheet is 15% to 30% of the thickness of the largest inner tooth, and the thickness of the outer tooth is equal and Its thickness is 2 to 3 times the thickness of the largest internal gear. 7. The laminated variable-tooth-thickness gear according to any one of claims 1-6, characterized in that: the inner gear includes two kinds of inner gear structures with different hardnesses, and the hardness of the inner gears with two different hardnesses is The difference between the values is 10% to 15% of the hardness value of the high-hardness inner gears. Two kinds of inner gears with different hardness are arranged alternately. The total number of the inner gears is an odd number. The inner gears adjacent to the outer gears Its hardness is higher than that of the adjacent inner gear, and the outer gear adopts a composite damping steel plate structure. 8. The laminated variable tooth thickness gear according to claim 7, characterized in that: each vibration and noise reduction sheet is made of a single damping material, and the gear is provided with two kinds of damping materials made of damping materials with different damping characteristics. As for the noise reduction sheet, the loss factor peak values of the two types of vibration and noise reduction sheets correspond to two frequencies, and the two types of vibration and noise reduction sheets are alternately arranged between the teeth of the gear. 9. The laminated variable-tooth-thickness gear according to any one of claims 1-6, characterized in that: each vibration and noise reduction sheet is made of a single damping material, and the vibration and noise reduction sheets at different positions on the gear are made of The damping material with different damping characteristics is composed, and the peak value of the loss factor of each vibration and noise reduction sheet corresponds to a different frequency. The vibration and noise reduction sheets with different damping characteristics are arranged in order in the axial direction of the gear according to the frequency corresponding to the peak value of the loss factor , the frequency corresponding to the peak value of the loss factor of the vibration and noise reduction plate that is close to the outer tooth plate with a smaller tooth thickness is higher than the frequency corresponding to the peak value of the loss factor of the vibration and noise reduction plate that is close to the outer tooth plate with a larger tooth thickness the corresponding frequency. 10. The laminated variable-tooth-thickness gear according to any one of claims 1-6, characterized in that: frequency fine-tuning holes (6) are provided on the vibration and noise reduction plate, and the frequency fine-tuning holes are 3 to 6 One, uniformly arranged along the circumferential direction of the inner tooth sheet, and the frequency fine-tuning holes on two adjacent vibration and noise reduction sheets are staggered.