CN115750727A - Noise reduction gear and engine - Google Patents

Abstract

The invention belongs to the technical field of engines, and in particular relates to noise reduction gears and engines. The noise reduction gear includes a first gear and a second gear with the same module and number of teeth, the noise reduction gear also includes an adjustment assembly, the second gear is sleeved on the first gear, and the teeth of the second gear and the teeth of the first gear The gear teeth are set at a staggered angle in the circumferential direction, the adjustment assembly is connected with the first gear, and the adjustment assembly is connected with the second gear; when the first gear and the second gear rotate relative to each other, the adjustment assembly is set to adjust the stagger angle, and adjust The distance between the first gear and the second gear. The present invention uses an adjustment assembly to make the first gear and the second gear far away from each other to eliminate the backlash between the gears, thereby avoiding the collision impact during the initial stage meshing, reducing the noise generated by the engine, and eliminating the need to use the prior art The rubber sleeve prevents the rubber sleeve from cracking or losing elasticity due to repeated extrusion and force, thereby improving the service life of the noise reduction gear.

Description

Noise reduction gear and engine

technical field

The invention belongs to the technical field of engines, and in particular relates to a noise reduction gear and an engine.

Background technique

This section provides background information related to the present disclosure only and is not necessarily prior art.

The gears of the engine will be heated and expanded during the transmission process, and there are factors such as errors in the actual processing and assembly. When processing the gears, it is necessary to manually adjust the way to leave a suitable gear backlash, so as to avoid the thermal expansion and eccentric installation of the gears during work. Tooth surface interference or even jamming occurs, resulting in transmission failure. When the gear teeth are transmitting torque, due to the gear backlash between the gears of the gear pair, the meshing is not smooth, resulting in a collision impact during the initial stage of meshing, and the gear-driven accessories also bear a certain impact load while obtaining power , resulting in louder engine noise.

The noise reduction gear in the prior art generally consists of three parts: the first gear, the second gear and the pin. The pin can pass through the first gear and the second gear to realize the connection between the first gear and the second gear, so that the first The gear and the second gear are used as a compound gear for meshing transmission with the transmission gear. There is a rubber sleeve on the outside of the pin, relying on the elastic effect of the rubber sleeve to make the first gear and the second gear stagger a certain angle, so that the first gear and the second gear are respectively fitted with the transmission gear, thereby eliminating the gear the side gap between.

In this way, since the return of the second gear needs to be guaranteed by the elasticity of the rubber sleeve, but the rubber sleeve is repeatedly squeezed and stressed during the working process, the rubber sleeve is easily broken, damaged or loses elasticity, and the effective service life of the rubber sleeve Lower, thus affecting the effect of backlash elimination. At the same time, the rigidity of the rubber sleeve cannot be evaluated. If the rigidity is too high, the transmission gear may be stuck due to thermal expansion, and the normal operation of the gear transmission pair cannot be guaranteed.

Contents of the invention

The object of the present invention is to at least solve the problem of short effective service life of the noise reduction gears in the prior art. This purpose is achieved through the following technical solutions:

The first aspect of the present invention proposes a noise reduction gear, including a first gear and a second gear with the same module and number of teeth, the second gear is sleeved on the first gear, and the second The gear teeth of the gear and the gear teeth of the first gear are arranged at a staggered angle in the circumferential direction, and the noise reduction gear further includes:

an adjustment assembly, the adjustment assembly is connected to the first gear, and the adjustment assembly is connected to the second gear;

When the first gear and the second gear rotate relative to each other, the adjustment assembly is configured to adjust the stagger angle and adjust the distance between the first gear and the second gear.

According to the noise-reducing gear of the present invention, the adjustment assembly is used to make the first gear and the second gear far away from each other to eliminate the backlash between the gears, thereby avoiding the collision impact during the initial meshing and reducing the noise generated by the engine without The rubber sleeve in the prior art is adopted to avoid cracking or loss of elasticity of the rubber sleeve due to repeated extrusion and force, thereby improving the service life of the noise reduction gear.

In addition, the noise reduction gear according to the present invention may also have the following additional technical features:

In some embodiments of the present invention, the adjustment assembly includes a first adjustment part and a second adjustment part;

The first adjusting part is arranged on the first gear, the second adjusting part is arranged on the second gear, and the first adjusting part and the second adjusting part abut against each other.

In some embodiments of the present invention, the first gear is provided with a first installation hole, and a first fastener is provided in the first installation hole, and the first adjustment part is fixedly connected to the first fastener. on the firmware;

The second gear is provided with a second mounting hole, a second fastener is disposed in the second mounting hole, and the second adjusting part is fixedly connected to the second fastener;

The first mounting hole is opposite to the second mounting hole.

In some embodiments of the present invention, the first adjusting part is a first wedge block, and the first wedge block includes a first working surface;

The second adjusting part is a second wedge block, and the second wedge block includes a second working surface;

The first working surface abuts against the second working surface.

In some embodiments of the present invention, both the first working surface and the second working surface are sloped.

In some embodiments of the present invention, the first wedge block further includes a first mating surface, and the first mating surface is mated with the arc portion of the first gear;

The second wedge block also includes a second matching surface, and the second matching surface is matched with the arc portion of the second gear.

In some embodiments of the present invention, a boss is provided around the first shaft hole on the chainring of the first gear, and the second gear is sleeved on the boss and can rotate relative to the boss.

In some embodiments of the present invention, the adjustment assembly further includes a reset member;

The boss is provided with a groove, the reset member is arranged in the groove, the reset member has a pre-tightening force, and the first gear and the second gear are pressed by the pre-tightening force. tight.

In some embodiments of the present invention, the reset member is a Belleville spring.

The second aspect of the present invention proposes an engine comprising the noise reduction gear as described in the above embodiments.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to denote the same parts. In the attached picture:

Figure 1 schematically shows a schematic diagram of the overall structure of a noise-reducing gear according to an embodiment of the present invention (the teeth of the first gear and the teeth of the second gear are arranged at staggered angles);

Fig. 2 is the structural representation of A-A section among Fig. 1;

Fig. 3 is the structural representation of B-B section among Fig. 1;

Fig. 4 is a partial enlarged view of place C in Fig. 1;

Fig. 5 is a schematic diagram of an exploded structure of the noise reduction gear in Fig. 1;

Fig. 6 is a schematic diagram of the assembly structure of the first gear and the first adjusting part shown in Fig. 1;

Fig. 7 is a structural schematic view of the first gear and the first adjusting part shown in Fig. 6 at a second viewing angle;

Fig. 8 is a structural schematic diagram of the first gear and the first adjusting part shown in Fig. 6 in an assembled state;

Fig. 9 is a sectional view of D-D section in Fig. 8;

Fig. 10 is a structural schematic view of the first gear and the first adjusting part shown in Fig. 8 at a second viewing angle;

Fig. 11 is a schematic structural diagram of the first adjusting part in Fig. 6;

Fig. 12 is a structural schematic diagram of a second viewing angle of the first adjusting part in Fig. 6;

Fig. 13 is a schematic diagram of the overall structure of the noise reduction gear shown in Fig. 1 (the teeth of the first gear and the teeth of the second gear overlap);

FIG. 14 is a cross-sectional view of E-E section in FIG. 13 .

The reference signs are as follows:

100 is the noise reduction gear;

10 is the first gear; 11 is the first mounting hole; 12 is the boss; 121 is the groove; 13 is the first shaft hole; 14 is the first arc portion; 15 is the staggered surface;

20 is the second gear; 21 is the second mounting hole; 22 is the second shaft hole;

30 is the adjustment component; 31 is the first adjustment part; 311 is the first working surface; 312 is the first matching surface; 32 is the second adjusting part; 321 is the second working surface; 322 is the second matching surface;

40 is the first fastener;

50 is the second fastener;

60 is reset piece.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also be meant to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated features, steps, operations, elements and/or parts but do not exclude the presence or addition of one or Various other features, steps, operations, elements, components, and/or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is specifically indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be referred to as These terms are limited. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature as shown in the figures with respect to another element or feature, such as "inner", "outer", "inner". ", "Outside", "Below", "Below", "Above", "Above", etc. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "beneath" the other elements or features. feature above". Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in Figures 1 to 14, according to an embodiment of the present invention, a noise reduction gear 100 is proposed, including a first gear 10 and a second gear 20 with the same module and number of teeth, and the second gear 20 is sleeved on On the first gear 10, and the gear teeth of the second gear 20 and the gear teeth of the first gear 10 are arranged at a staggered angle along the circumferential direction. In FIG. The gear teeth of the second gear 20 are set at a staggered angle. The noise reduction gear 100 also includes an adjustment assembly 30. The adjustment assembly 30 is connected with the first gear 10 and connected with the second gear 20. The adjustment assembly 30 is located between the first gear 10 and the second gear. Between the gears 20, when the first gear 10 and the second gear 20 rotate relative to each other, the stagger angle is changed by adjusting the assembly 30 and the distance between the first gear 10 and the second gear 20 can be adjusted, that is, The adjusting assembly 30 can make the first gear 10 and the second gear 20 move away from each other or approach each other.

The noise-reducing gear 100 in the present invention uses an adjustment assembly 30 to make the first gear 10 and the second gear 20 far away from each other to eliminate the backlash between the gears, thereby avoiding the collision impact during the initial stage of meshing and reducing the engine generated. Noise, no need to use the rubber sleeve in the prior art, avoiding the rubber sleeve from cracking or losing elasticity due to repeated extrusion and force, thereby improving the service life of the noise reduction gear 100 .

It should be explained that the teeth of the first gear 10 and the teeth of the second gear 20 of the noise-reducing gear 100 are set at an angle that is staggered. The stagger angle between the teeth of the first gear 10 and the teeth of the second gear 20 gradually becomes smaller, and when the teeth of the first gear 10 and the teeth of the second gear 20 coincide with each other, the stagger angle is zero, and the processing is eliminated at this time. The reserved tooth side clearance reduces the noise generated when the engine is running.

As shown in Figures 1 to 4, at this time, the state of the noise reduction gear 100 is the initial state, that is to say, the teeth of the first gear 10 and the teeth of the second gear 20 are set at staggered angles, that is to say A part of the surface of the first gear 10 facing the second gear 20 is the staggered surface 15. When the staggered angle changes, the size of the staggered surface 15 will also change. The larger the staggered angle, the larger the area of the staggered surface 15.

Here, the partial surface of the first gear 10 is used as the staggered surface 15, and the partial surface of the second gear 20 can also be selected as the staggered surface 15 as required, no matter whether the surface of the first gear 10 or the surface of the second gear 20 is selected, It is substantially consistent, and the staggered distance can also be used to measure the degree of stagger between the teeth of the first gear 10 and the second gear 20, or the thickness or width of the noise reduction gear 100 can be used to measure the degree of stagger of the first gear 10. The degree of offset between the gear teeth and the second gear 20.

In some optional embodiments, the adjustment assembly 30 includes a first adjustment part 31 and a second adjustment part 32; the first adjustment part 31 is arranged on the first gear 10, and the second adjustment part 32 is arranged on the second gear 20 , and the first adjusting portion 31 and the second adjusting portion 32 are in contact with each other.

Wherein, the distance between the first gear 10 and the second gear 20 is realized through the interaction between the first adjusting part 31 and the second adjusting part 32 .

It should be noted that the number of the first adjusting part 31 is one or more, and the number of the second adjusting part 32 is the same as that of the first adjusting part 31 . In the present invention, as shown in FIG. 5 , the number of the first adjusting portion 31 and the second adjusting portion 32 are three, and the three first adjusting portions 31 are spaced apart along the circumferential direction of the chainring of the first gear 10 It is provided that three second adjusting parts 32 are arranged at intervals along the circumference of the chainring of the second gear 20, and each first adjusting part 31 is arranged in contrast to the corresponding second adjusting part 32 to form three contact surfaces, here The interval setting, usually adopts the uniform interval setting method, that is to say, the angle between two adjacent first adjustment parts 31 is 120 degrees, and similarly, the angle between two adjacent second adjustment parts 32 is also 120 degrees, and each first adjusting portion 31 is matched with a second adjusting portion 32 .

Here, the number of the first adjusting parts 31 may also be two, four or more, and the corresponding number of the second adjusting parts 32 is consistent with the number of the first adjusting parts 31 , which will not be repeated here.

In some optional embodiments, the first gear 10 is provided with a first mounting hole 11, and a first fastener 40 is disposed in the first mounting hole 11, and the first adjusting part 31 is fixedly connected to the first fastener 40. Above; the second gear 20 is provided with a second mounting hole 21, the second mounting hole 21 is provided with a second fastener 50, and the second adjusting part 32 is fixedly connected to the second fastener 50; the first mounting hole 11 It is set opposite to the second installation hole 21 .

It should be noted that the shape of the first mounting hole 11 is compatible with the shape and size of the first fastener 40, such as the first mounting hole 11 is a circular through hole, and the first fastener 40 is cylindrical; The shape and size of the second mounting hole 21 and the second fastener 50 are adapted to each other, such as the second mounting hole 21 is a circular through hole, the second fastener 50 is cylindrical, of course, the first fastener 40 and The second fastening member 50 may also adopt other shapes, such as a cone-shaped column or a rectangular column.

In addition, the first fastener 40 and the second fastener 50 here can generally adopt products such as positioning pins.

In addition, the first adjustment part 31 is provided with a through hole here for allowing the first fastener 40 to pass through, and the second adjustment part 32 is also provided with a through hole for the second fastener 50 to pass through.

In some optional embodiments, the first adjusting part 31 is a first wedge block, and the first wedge block includes a first working surface 311; the second adjusting part 32 is a second wedge block, and the second wedge block includes a second working surface Surface 321; the first working surface 311 and the second working surface 321 are set opposite to each other. The first fastener 40 passes through the first working surface 311 , and the second fastener 50 passes through the second working surface 321 .

Wherein, the first working surface 311 and the second working surface 321 are the contact parts between the first adjusting part 31 and the second adjusting part 32, through the variation of the contact area between the first working surface 311 and the second working surface 321, Realize the distance adjustment between the first gear 10 and the second gear 20, when the contact area between the first gear 10 and the second gear 20 is the largest, the distance between the first gear 10 and the second gear 20 is the smallest, when When the contact area between the first gear 10 and the second gear 20 is the smallest, the distance between the second gear 20 and the second gear 20 is the largest.

In some optional embodiments, the first working surface 311 and the second working surface 321 are working surfaces that cooperate with each other, the first working surface 311 may be a convex surface, and the second working surface 321 may be a suitable concave surface; The working surface 311 is a concave surface, and the second working surface 321 is a matching convex surface.

For simple processing, both the first working surface 311 and the second working surface 321 can be set as inclined planes, that is to say, the first working surface 311 and the second working surface 321 are inclined planes, and the first gear 10 and the second working surface When the second gear 20 rotates, relative rotation occurs between the first working surface 311 and the second working surface 321 .

In some optional embodiments, the first wedge block further includes a first mating surface 312, and the first mating surface 312 is mated with the arc portion of the first gear 10, and the arc portion of the first gear 10 is called the first circle The arc portion 14, the second wedge block also includes a second mating surface 322, the second mating surface 322 cooperates with the arc portion of the second gear 20, the arrangement of the arc portion of the second gear 20 and the first arc portion 14 Similarly, the circular arc portion of the second gear 20 will not be elaborated here.

It can be seen from Fig. 5, Fig. 6 and Fig. 7 that the first arc portion 14 is arranged in a circular shape, and the first mating surface 312 is in contact with the inner arc surface of the first arc portion 14, thereby facilitating the first adjustment Part 31 of the installation. Similarly, the arc portion of the second gear 20 is also arranged in an arc shape, and the second mating surface 322 is in contact with the inner arc surface of the arc portion of the second gear 20 , thereby facilitating the installation of the second adjusting portion 32 .

It should be noted that the first mating surface 312 and the second mating surface 322 here are both arc-shaped surfaces, and are respectively consistent with the radian and size of the matching arc portion, that is, the arc of the first mating surface 312 The radian is the same as that of the first arc portion 14, and the radius is the same.

In some optional embodiments, the toothed disc of the first gear 10 is provided with a boss 12 around the first shaft hole 13, and the second gear 20 is sleeved on the boss 12 of the first gear 10, and can be opposed to the boss. Table 12 rotates. The connection between the second gear 20 and the first gear 10 can be realized by setting the boss 12 .

It should be noted that the first shaft hole 13 is provided through the boss 12 , and the axial direction of the first shaft hole 13 is aligned with the axial direction of the boss 12 , which facilitates the installation of the noise reducing gear 100 .

In some optional embodiments, the noise reduction gear 100 also includes a reset member 60; the boss 12 is provided with a groove 121, the reset member 60 is arranged in the groove 121, and the reset member 60 has a pre-tightening force. The force compresses the first gear 10 and the second gear 20 . The reset member 60 is a Belleville spring, and can also be a spring of other shapes, as long as the reset can be realized.

By setting the reset member 60, when the torque received by the noise reduction gear 100 is zero, the second gear 20 is pressed by the reset member 60, so that the rotation of the second adjustment part 32 and the first adjustment part 31 returns to the initial state, The distance between the first gear 10 and the second gear 20 becomes smaller, and the stagger angle between the teeth of the first gear 10 and the teeth of the second gear 20 becomes larger.

It should be noted that the groove 121 here has a circular shape as a whole and a U-shaped cross-section, so that part of the reset member 60 is located in the groove 121 .

In some optional embodiments, the first gear 10 further includes a first shaft hole 13, the first shaft hole 13 is a circular through hole, the second gear 20 includes a second shaft hole 22, and the second shaft hole 22 is a circular through hole. Shaped through holes, wherein the gear is provided with a shaft hole is a common structure in the prior art, and will not be described here.

It should be noted that the diameter of the second shaft hole 22 of the second gear 20 is adapted to the outer diameter of the boss 12 , so that the inner annular surface of the second gear 20 is in contact with the outer surface of the boss 12 .

Taking three first fasteners 40 and three second fasteners 50 as an example, the assembly method of the noise reduction gear 100 in the present invention will be described in detail below, specifically:

S1. Install each first fastener 40 in the through hole of the first adjustment part 31, and install each second fastener 50 in the through hole of the second adjustment part 32;

Here, the first fastener 40 and the first adjustment part 31 are in the form of an interference fit, and the relationship between the second fastener 50 and the second adjustment part 32 is in the form of an interference device.

S2. Put the first fasteners 40 with the first adjustment parts 31 into the first installation holes 11 respectively, and transfer the second fasteners 50 with the second adjustment parts 32 into the second installation holes 21 respectively Inside;

Assembling the second gear 20 and the second gear 20 together, so that the first working surfaces 311 of the three first adjusting parts 31 respectively cooperate with the second working surfaces 321 of the three second adjusting parts 32;

S3. Install the reset member 60 in the groove 121 of the first gear 10. The assembled noise reduction gear 100 is shown in FIGS. The gear teeth of 10 and the gear teeth of the second gear 20 are set at an angle of stagger.

S1 and S2 in the above process do not represent the sequence, and the sequence S1 and S2 can also be interchanged.

In S2, the first matching surface 312 of the assembled first adjusting part 31 is in contact with the first circular arc part 14 of the first gear 10, and the second matching surface 322 of the assembled second adjusting part 32 is in contact with the second gear. 20 arc contact.

The specific working process of noise reduction gear 100 among the present invention is:

After assembling the assembled noise reduction gear 100 on the engine, the noise reduction gear 100 is meshed with the transmission gear. When the noise reduction gear 100 transmits torque, both the tooth surfaces of the first gear 10 and the second gear 20 are under pressure. Relative rotation occurs between the first gear 10 and the second gear 20, and the staggered angle between the gear teeth of the first gear 10 and the second gear 20 becomes smaller until they overlap. The adjustment part 31 rotates with the first gear 10, and the second adjustment part 32, which is interference fit on the second gear 20, rotates with the second gear 20, due to the gap between the first adjustment part 31 and the second adjustment part 32 The contact surface is an inclined surface. When the first adjusting part 31 and the second adjusting part 32 are staggered, an axial relative displacement occurs between the first gear 10 and the second gear 20, and the first gear 10 and the second gear 20 The distance between them becomes larger, the reset member 60 is deformed by force, and the elastic force increases, and the state at this time is shown in Fig. 13 and Fig. 14 .

When the torque received by the noise reduction gear 100 becomes smaller or zero, the second gear 20 is pressed by the reset member 60, so that the second adjustment part 32 and the first adjustment part 31 are relatively rotated, so that the first gear 10 and the first adjustment part 31 are relatively rotated. The distance between the second gears 20 becomes smaller, and the stagger angle between the teeth of the first gear 10 and the teeth of the second gear 20 becomes larger, returning to the original state, which is the state shown in Figure 4 .

When the noise reduction gear 100 transmits torque again, repeat the above process, thereby realizing multiple uses of the noise reduction gear 100, in each use process, the gear teeth of the first gear 10 and the teeth of the second gear 20 can be made The stagger angle between the gear teeth becomes smaller, and the distance between the first gear 10 and the second gear 20 becomes larger, which eliminates the tooth side clearance reserved for processing, reduces the noise generated when the engine is running, and improves the noise reduction gear 100. service life.

The reset member 60, the first adjustment part 31 and the second adjustment part 32 in the present invention can be made of stronger metal parts, such as heat-resistant steel and other materials, which have a long service life, can withstand repeated impacts, and are resistant to high temperatures And oil resistance, thereby improving the service life of the noise reduction gear 100.

The second aspect of the embodiments of the present invention provides an engine, including the noise reduction gear 100 mentioned in the above embodiments.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A noise reduction gear, comprising a first gear and a second gear with the same module and number of teeth, the second gear is sleeved on the first gear, and the teeth of the second gear and the The gear teeth of the first gear are arranged at a staggered angle in the circumferential direction, and it is characterized in that the noise reduction gear also includes: an adjustment assembly, the adjustment assembly is connected to the first gear, and the adjustment assembly is connected to the second gear; When the first gear and the second gear rotate relative to each other, the adjustment assembly is configured to adjust the stagger angle and adjust the distance between the first gear and the second gear. 2. The noise reduction gear according to claim 1, characterized in that, the adjustment assembly comprises a first adjustment part and a second adjustment part; The first adjusting part is arranged on the first gear, the second adjusting part is arranged on the second gear, and the first adjusting part and the second adjusting part abut against each other. 3. The noise reduction gear according to claim 2, wherein the first gear is provided with a first mounting hole, a first fastener is disposed in the first mounting hole, and the first adjusting part fixed on the first fastener; The second gear is provided with a second mounting hole, a second fastener is disposed in the second mounting hole, and the second adjusting part is fixedly connected to the second fastener; The first mounting hole is opposite to the second mounting hole. 4. The noise reduction gear according to claim 2 or 3, characterized in that, the first adjusting part is a first wedge block, and the first wedge block includes a first working surface; The second adjusting part is a second wedge block, and the second wedge block includes a second working surface; The first working surface abuts against the second working surface. 5 . The noise reduction gear according to claim 4 , wherein both the first working surface and the second working surface are inclined surfaces. 6. The noise reduction gear according to claim 4, wherein the first wedge block further comprises a first mating surface, and the first mating surface is mated with the arc portion of the first gear; The second wedge block also includes a second matching surface, and the second matching surface is matched with the arc portion of the second gear. 7. The noise-reducing gear according to claim 3, characterized in that, the tooth disc of the first gear is provided with a boss around the first shaft hole, and the second gear is sleeved on the boss and Can be rotated relative to the boss. 8. The noise reducing gear according to claim 7, characterized in that, the adjustment assembly further comprises a reset member; A groove is arranged on the boss, and the reset member is arranged in the groove; The reset member has a pre-tightening force, and the first gear and the second gear are compressed by the pre-tightening force. 9. The noise-reducing gear according to claim 8, wherein the reset member is a Belleville spring. 10. An engine, characterized by comprising the noise reduction gear according to any one of claims 1 to 9.

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