Tractor engine noise reduction structure

Abstract

The utility model discloses a tractor engine noise reduction structure which comprises an engine body, a driving shaft is installed on the engine body, a belt pulley is fixed to one end of the driving shaft, a first annular cover body is arranged on one side of the engine body, and a second annular cover body is arranged in the first annular cover body. Annular sound-absorbing cotton is placed on the inner side of the first annular cover body and the inner side of the second annular cover body, two openings allowing a belt to pass through are formed in the second annular cover body, two notches are formed in the annular sound-absorbing cotton, and a sealing cover is arranged on one side of the second annular cover body. The size of the opening is small, the size of the opening is slightly larger than that of the belt, noise overflow is avoided, the noise reduction effect is achieved, after the belt penetrates through the opening, the space of the remaining opening is smaller, dust, dust, chippings and other impurities are not prone to entering the first annular cover body and the second annular cover body from the opening, and the noise reduction effect is good. Dust, dust, chippings and other impurities are prevented from affecting the noise reduction effect of the annular sound absorption cotton.

Description

Technical Field

[0001] This utility model relates to the field of engine noise reduction technology, and in particular to a noise reduction structure for a tractor engine. Background Technology

[0002] A tractor is a self-propelled power machine used to traction and drive work machinery to complete various mobile operations. It can also be used as a power source for stationary operations. In the existing technology, when the tractor engine is working, the drive end connection point emits a loud noise, which affects the driver's hearing.

[0003] Publication No. CN 217761145 U discloses a noise reduction structure for a tractor engine, including an engine body, an exhaust noise reduction structure installed on one side of the engine body, and a drive end noise reduction structure installed on the other side of the engine body; the drive end noise reduction structure includes: a rotating shaft, a protective cover, a first sound-absorbing cotton layer, several through holes, and several sound-absorbing components.

[0004] The aforementioned existing technology reduces noise by installing a protective cover on the outside of the drive end and lining the inside of the cover with sound-absorbing cotton. However, the protective cover has a large opening on one side for the belt to pass through. This design has the following problems: Firstly, as... Figure 6 As shown, from a visual perspective, for better differentiation, the belt 30 is divided into an upper belt 31 and a lower belt 32. Since the opening on the protective cover in the prior art allows the belt 30 to pass through, the height of the opening is greater than the distance between the upper belt 31 and the lower belt 32. The larger opening can easily lead to noise leakage. Moreover, the working environment of tractors is usually harsh, with a lot of dust, powder, debris and other impurities. These impurities can easily enter the protective cover through the larger opening. When these impurities adhere to the sound-absorbing cotton, they will affect the noise reduction effect of the sound-absorbing cotton. Therefore, it is necessary to remove the protective cover for cleaning regularly. However, in this device, the belt passes through the opening of the protective cover. Therefore, to remove the protective cover, all the bolts between the protective cover and the engine must first be removed, and then the belt must be removed from the pulley before the entire protective cover can be removed. The process is very troublesome. Utility Model Content

[0005] (a) Purpose of the utility model

[0006] In view of this, the purpose of this utility model is to propose a noise reduction structure for a tractor engine. The technical problem it aims to solve is that because the opening on the protective cover allows the belt to pass through, the height of the opening is greater than the distance between the upper and lower belts. The large opening can easily lead to noise leakage. Furthermore, the working environment of tractors is usually harsh, with a lot of dust, debris, and other impurities. These impurities can easily enter the protective cover through the large opening. When these impurities adhere to the sound-absorbing cotton, they will affect the noise reduction effect of the sound-absorbing cotton. Therefore, it is necessary to remove the protective cover regularly for cleaning. Moreover, when the drive end malfunctions, it is also necessary to remove the protective cover to inspect the drive end. However, in this device, the belt passes through the opening of the protective cover. Therefore, to remove the protective cover, it is necessary to first remove all the bolts between the protective cover and the engine, and then remove the belt from the pulley before the entire protective cover can be removed. The process is very troublesome.

[0007] (II) Technical Solution

[0008] To achieve the above technical objectives, this utility model provides a noise reduction structure for a tractor engine:

[0009] It includes an engine body, on which a drive shaft is mounted. A pulley is fixed to one end of the drive shaft. A first annular cover is provided on one side of the engine body. A second annular cover is provided inside the first annular cover. Annular sound-absorbing cotton is placed inside the first and second annular covers. Two openings for a belt to pass through are provided inside the second annular cover. Two slots are provided inside the annular sound-absorbing cotton. A sealing cover is provided on one side of the second annular cover. A positioning component is provided on the second annular cover. When the belt is put onto the pulley, the positioning component fixes the second annular cover and the first annular cover. After the belt is installed, the positioning component fixes the sealing cover and the second annular cover.

[0010] Preferably, the first annular cover has an inner cavity, the second annular cover is slidably fitted into the inner cavity, the inner cavity is provided with a plurality of first springs, one end of the first spring is fixed to the inner wall of the inner cavity, and the other end of the first spring is fixed to the second annular cover.

[0011] Preferably, in its normal state, the distance between the first annular cover and the second annular cover on opposite sides is equal to the length of the annular sound-absorbing cotton.

[0012] Preferably, the inner wall of the first annular cover is provided with a plurality of guide grooves at equal intervals, and the inner wall of the second annular cover is provided with a plurality of guide posts at equal intervals, the guide posts being slidably fitted into the corresponding guide grooves.

[0013] Preferably, the positioning component includes multiple first positioning holes equally spaced on the outer side of the first annular cover, multiple second positioning holes equally spaced on the outer side of the sealing cover, multiple brackets equally spaced on the outer side of the second annular cover, a protruding post rotatably connected to one end of each bracket, a connecting plate fixed on the protruding post, a cylindrical tube fixed inside the connecting plate, a positioning post slidably connected inside the cylindrical tube, and the positioning post being able to be embedded into the corresponding first positioning hole and second positioning hole.

[0014] Preferably, a pull rod is fixed to one end of the positioning post, the pull rod passes through the cylindrical tube and slides inside the cylindrical tube, a second spring is sleeved on the outside of the pull rod, one end of the second spring abuts against the positioning post, and the other end of the second spring abuts against the inner wall of the cylindrical tube.

[0015] Preferably, multiple mounting blocks are fixed at equal intervals on the outer side of the first annular cover, and the mounting blocks are fixed to the engine body by bolts.

[0016] As can be seen from the above technical solutions, this application has the following beneficial effects:

[0017] 1. The opening size is relatively small, slightly larger than the belt size, which prevents noise leakage and plays a role in noise reduction. Moreover, after the belt passes through the opening, the remaining space of the opening is even smaller, making it difficult for dust, powder, debris and other impurities to enter the first and second annular covers, thus preventing dust, powder, debris and other impurities from affecting the noise reduction effect of the annular sound-absorbing cotton.

[0018] 2. When installing or removing the belt from the pulley, move the second annular cover into the first annular cover. At this time, the positioning pin is embedded in the first positioning hole, thus fixing the first and second annular covers together. The second annular cover does not obstruct the pulley, facilitating belt installation or removal. When the sealing cover needs to be placed on the second annular cover, embed the positioning pin into the second positioning hole, thus fixing the second annular cover and the sealing cover together. The sealing cover then seals the second annular cover. In other words, the positioning component can not only fix the second and first annular covers but also the sealing cover. This can be switched as needed, and this method also makes it easy to remove the sealing cover, facilitating the removal, cleaning, or replacement of the annular sound-absorbing cotton. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A schematic diagram of a noise reduction structure for a tractor engine provided by this utility model;

[0021] Figure 2 A structural diagram showing the disassembled noise reduction structure for a tractor engine provided by this utility model;

[0022] Figure 3 Provided by this utility model Figure 2 Schematic diagram of the structure at point A;

[0023] Figure 4 A cross-sectional schematic diagram of the positioning component provided by this utility model;

[0024] Figure 5 Provided by this utility model Figure 4 Schematic diagram of the structure at point B;

[0025] Figure 6 This is a partial structural diagram of a noise reduction structure for a tractor engine provided by the present invention.

[0026] Figure Descriptions: 1. Engine body; 2. Drive shaft; 3. Pulley; 4. First annular cover; 5. Second annular cover; 6. Annular sound-absorbing cotton; 7. Opening; 8. Groove; 10. Sealing cover; 11. Inner cavity; 12. First spring; 13. Guide groove; 14. Guide post; 15. Bracket; 16. Protruding post; 17. Connecting plate; 18. Cylindrical tube; 19. Positioning post; 20. Tie rod; 21. First positioning hole; 22. Second positioning hole; 23. Second spring; 24. Mounting block; 30. Belt; 31. Upper belt; 32. Lower belt. Detailed Implementation

[0027] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0028] Reference Figure 1-6 :

[0029] In one embodiment of this utility model, a noise reduction structure for a tractor engine is provided, including an engine body 1, a drive shaft 2 mounted on the engine body 1, a pulley 3 fixed to one end of the drive shaft 2, a first annular cover 4 provided on one side of the engine body 1, a plurality of mounting blocks 24 fixed at equal intervals on the outer side of the first annular cover 4, the mounting blocks 24 being fixed to the engine body 1 by bolts, a second annular cover 5 provided inside the first annular cover 4, annular sound-absorbing cotton 6 placed inside the first annular cover 4 and the second annular cover 5, two openings 7 for belts to pass through the second annular cover 5, two slots 8 provided inside the annular sound-absorbing cotton 6, a sealing cover 10 provided on one side of the second annular cover 5, and a positioning component provided on the second annular cover 5. When the belt is put onto the pulley 3, the positioning component fixes the second annular cover 5 and the first annular cover 4. After the belt is installed, the positioning component fixes the sealing cover 10 and the second annular cover 5.

[0030] The positioning component includes multiple first positioning holes 21 equally spaced on the outside of the first annular cover 4, multiple second positioning holes 22 equally spaced on the outside of the sealing cover 10, and multiple brackets 15 equally spaced on the outside of the second annular cover 5. One end of each bracket 15 is rotatably connected to a protruding post 16, and a connecting plate 17 is fixed on the protruding post 16. A cylindrical tube 18 is fixed inside the connecting plate 17, and a positioning post 19 is slidably connected inside the cylindrical tube 18. The positioning post 19 can be embedded into the corresponding first positioning hole 21 and second positioning hole 22. One end of the positioning post 19 is fixed with a pull rod 20, which passes through the cylindrical tube 18 and slides inside the cylindrical tube 18. A second spring 23 is sleeved on the outside of the pull rod 20. One end of the second spring 23 abuts against the positioning post 19, and the other end of the second spring 23 abuts against the inner wall of the cylindrical tube 18.

[0031] In addition, an inner cavity 11 is provided inside the first annular cover 4, and the second annular cover 5 is slidably fitted inside the inner cavity 11. Multiple first springs 12 are provided inside the inner cavity 11, and one end of the first spring 12 is fixed to the inner wall of the inner cavity 11, while the other end of the first spring 12 is fixed to the second annular cover 5.

[0032] It should be noted that, as Figure 6As shown, from a visual perspective, for better differentiation, the belt 30 is divided into an upper belt 31 and a lower belt 32. In use, when the belt 30 needs to be installed onto the pulley 3, firstly, the second annular cover 5 is moved into the inner cavity 11. When the second annular cover 5 moves, it compresses the first spring 12. Then, the pull rod 20 is pulled, causing the positioning pin 19 to move into the cylindrical cylinder 18, and the positioning pin 19 compresses the second spring 23. Then, the connecting plate 17 is rotated, causing the cylindrical cylinder 18 and the positioning pin 19 to rotate, moving the positioning pin 19 to the first positioning position. When the first annular cover 5 is in the first positioning hole 21, release the pull rod 20. At this time, under the rebound force of the second spring 23, the positioning pin 19 moves downward, so that the positioning pin 19 is embedded in the first positioning hole 21, that is, the second annular cover 5 and the first annular cover 4 are fixed together. At this time, the second annular cover 5 is retracted into the first annular cover 4, that is, the second annular cover 5 will not block the pulley 3, making it convenient to put the belt 30 onto the pulley 3. Then pull the pull rod 20 again, so that the positioning pin 19 moves out of the first positioning hole 21. Then release the pull rod 20. At this time, under the rebound force of the first spring 12, the second annular cover 5 moves downward. The second annular cover 5 moves, causing it to move out of the first annular cover 4. At this time, the belt 30 will be embedded in the opening 7. Then, the annular sound-absorbing cotton 6 is placed into the first annular cover 4 and the second annular cover 5, so that the belt 30 is embedded in the groove 8. Then, the second annular cover 5 is sealed with the sealing cap 10, thus completing the installation. In this method, the size of the opening 7 is relatively small, slightly larger than the size of the upper belt 31 and the lower belt 32, and there are two openings 7. The upper belt 31 and the lower belt 32 pass through the corresponding openings 7 respectively. In the prior art, a large opening is provided for the belt 30 to pass through. The excess part between the upper belt 31 and the lower belt 32 is also blocked by the second annular cover 5, i.e., the smaller opening 7. This also prevents noise leakage and plays a role in noise reduction. Moreover, when the upper belt 31 and the lower belt 32 pass through the corresponding opening 7, the space of the remaining opening 7 is even smaller. Dust, powder, debris and other impurities are not easy to enter the first annular cover 4 and the second annular cover 5 from the opening 7, thus preventing dust, powder, debris and other impurities from affecting the noise reduction effect of the annular sound-absorbing cotton 6.

[0033] In addition, in the normal state, the distance between the first annular cover 4 and the second annular cover 5 on the side away from each other is equal to the length of the annular sound-absorbing cotton 6. The inner wall of the first annular cover 4 is provided with multiple guide grooves 13 at equal intervals, and the inner wall of the second annular cover 5 is provided with multiple guide posts 14 at equal intervals. The guide posts 14 are slidably fitted in the corresponding guide grooves 13.

[0034] When using the belt 30, when installing it onto or removing it from the pulley 3, the second annular cover 5 is moved into the first annular cover 4. At this time, the positioning pin 19 is embedded in the first positioning hole 21, that is, the first annular cover 4 and the second annular cover 5 are fixed together. The second annular cover 5 does not obstruct the pulley 3, facilitating the installation or removal of the belt 30. After the belt 30 is installed, the sealing cover 10 needs to be placed over the second annular cover 5 to seal it. To do this, first pull the lever 20 to move the positioning pin 19 out of the first positioning hole 21, then release the lever 20. The first spring 12 then moves the second annular cover 5, causing it to move out of the first annular cover 4. Then pull the lever again... Rod 20 moves the positioning pin 19 into the cylindrical tube 18, and the positioning pin 19 compresses the second spring 23. Then, the connecting plate 17 is rotated, causing the cylindrical tube 18 and the positioning pin 19 to rotate. When the positioning pin 19 moves to the second positioning hole 22, the rod 20 is released. At this time, under the rebound force of the second spring 23, the positioning pin 19 is driven to be embedded in the second positioning hole 22, that is, the second annular cover 5 and the sealing cover 10 are fixed together. At this time, the sealing cover 10 seals the second annular cover 5. That is, the positioning component can not only fix the second annular cover 5 and the first annular cover 4, but also fix the second annular cover 5 and the sealing cover 10. It can be switched according to needs, and this method makes it easy to remove the sealing cover 10, thereby facilitating the removal of the annular sound-absorbing cotton 6 for cleaning or replacement.

[0035] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A tractor engine noise reduction structure comprising an engine main body (1) having a drive shaft (2) mounted thereon, one end of the drive shaft (2) being fixed with a belt pulley (3), characterized in that, The side of the engine body (1) is provided with a first annular cover (4), the first annular cover (4) is provided with a second annular cover (5), the inner side of the first annular cover (4) and the second annular cover (5) is placed with annular sound-absorbing cotton (6), two openings (7) for the belt to pass through are formed in the second annular cover (5), two notches (8) are formed in the annular sound-absorbing cotton (6), the side of the second annular cover (5) is provided with a sealing cover (10), the second annular cover (5) is provided with a positioning assembly, when the belt is sleeved on the belt pulley (3), the positioning assembly fixes the second annular cover (5) and the first annular cover (4), after the belt is installed, the positioning assembly fixes the sealing cover (10) and the second annular cover (5).

2. The tractor engine noise reduction structure according to claim 1, characterized by, The first annular cover (4) is provided with an inner cavity (11), the second annular cover (5) is slidably connected in the inner cavity (11), a plurality of first springs (12) are arranged in the inner cavity (11), one end of the first spring (12) is fixed to the inner wall of the inner cavity (11), and the other end of the first spring (12) is fixed to the second annular cover (5).

3. The tractor engine noise reduction structure according to claim 2, characterized by, In the normal state, the distance between the first annular cover (4) and the second annular cover (5) is equal to the length of the annular sound-absorbing cotton (6).

4. The tractor engine noise reduction structure according to claim 1, characterized by The inner wall of the first annular cover (4) is provided with a plurality of guide grooves (13) at equal intervals, the inner wall of the second annular cover (5) is fixed with a plurality of guide columns (14) at equal intervals, and the guide column (14) is slidably connected in the corresponding guide groove (13).

5. The tractor engine noise reduction structure according to claim 1, characterized by The positioning assembly comprises a plurality of first positioning holes (21) arranged at equal intervals on the outer side of the first annular cover (4), a plurality of second positioning holes (22) are arranged at equal intervals on the outer side of the sealing cover (10), a plurality of supports (15) are fixed at equal intervals on the outer side of the second annular cover (5), one end of the support (15) is rotatably connected with a convex column (16), the convex column (16) is fixed with a connecting plate (17), the connecting plate (17) is fixed with a cylindrical barrel (18), the cylindrical barrel (18) is slidably connected with a positioning column (19), and the positioning column (19) can be embedded into the corresponding first positioning hole (21) and second positioning hole (22).

6. The tractor engine noise reduction structure according to claim 5, characterized by One end of the positioning column (19) is fixed with a pull rod (20), the pull rod (20) penetrates through the cylindrical barrel (18) and slides in the cylindrical barrel (18), a second spring (23) is sleeved on the outer side of the pull rod (20), one end of the second spring (23) abuts against the positioning column (19), and the other end of the second spring (23) abuts against the inner wall of the cylindrical barrel (18).

7. The tractor engine noise reduction structure according to claim 1, characterized by A plurality of mounting blocks (24) are fixed at equal intervals on the outer side of the first annular cover (4), and the mounting block (24) is fixed to the engine body (1) by bolts.

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