A noise reduction baffle connection structure for an engine

Abstract

The present invention provides a noise reduction baffle connection structure of an engine, which belongs to the field of engine technology. It solves the problem of unstable connection of the existing noise reduction baffle connection structure. The noise reduction baffle connection structure of the engine includes a cylinder head and a noise reduction baffle arranged outside the cylinder head, a fixing part is provided inside the cylinder head, and a chain cavity is formed between the fixing part and the inner wall of the cylinder head. The noise reduction baffle connection structure includes a fixing piece, and a mounting hole is provided on the outer wall of the cylinder head. One end of the fixing piece passes through the noise reduction baffle, the mounting hole and the chain cavity in sequence and is fixedly connected to the fixing piece, and the other end of the fixing piece has a fixed stop edge for pressing the noise reduction baffle against the outer wall of the cylinder head, and a seal that can seal the mounting hole is provided between the fixed stop edge and the cylinder head. The noise reduction baffle connection structure of the engine makes the connection between the noise reduction baffle and the cylinder head more stable, and further improves the stability of the noise reduction baffle connection structure.

Description

Technical Field

[0001] The invention belongs to the technical field of engines and relates to a noise reduction baffle connection structure of an engine. Background Art

[0002] With the continuous development of science and technology, people are using more and more vehicles such as cars and motorcycles. The engine is a more important part of cars or motorcycles. There will be NVH problems when cars or motorcycles are driving. The engine is the main source of noise, so it is necessary to optimize the noise reduction of each system of the engine. Since the noise generated by gear transmission accounts for the main part of the entire engine noise, adding a noise reduction device at the front end of the gear chamber can effectively reduce the noise generated by the gear transmission from spreading outward, thereby effectively reducing the overall noise of the engine.

[0003] In response to the above problems, people have developed various noise reduction devices for the front end gear train of the engine:

[0004] For example, a Chinese patent application (patent application number: 201520096495.2) discloses a noise reduction device at the front end of an engine, which includes a gear chamber, a gasket and a tightening bolt. A noise reduction device is arranged at the front end of the gear chamber, and the noise reduction device is a sound insulation sponge fixed by a plastic cover plate. The sound insulation sponge and the plastic cover plate are arranged on the outside of the gear chamber cover at the front end of the gear chamber, and the shapes of the sound insulation sponge and the plastic cover plate are matched with the gear chamber cover. The sound insulation sponge is pressed on the gear chamber cover through the plastic cover plate and fixed by a gasket and a tightening bolt.

[0005] The above structure reduces noise by providing a plastic cover and a sound insulation sponge, and fixing them on the outside of the gear chamber cover. However, the gear chamber may vibrate during the noise reduction process, and since there is a chain cavity in the gear chamber cover for placing gears, the gear chamber cover is relatively thin, which makes it easy for the gear chamber cover to vibrate. The plastic cover is only fixed by tightening bolts. During long-term use, the tightening bolts may become loose, affecting the stability of the installation of the plastic cover and the sound insulation sponge. Summary of the invention

[0006] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a noise reduction baffle connection structure for an engine. The technical problem to be solved by the present invention is: how to solve the problem of unstable connection of the existing noise reduction baffle connection structure.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A noise reduction baffle connection structure for an engine, the engine comprising a cylinder head and a noise reduction baffle arranged outside the cylinder head, the cylinder head having a fixing portion therein, a chain cavity being formed between the fixing portion and the inner wall of the cylinder head, and characterized in that the noise reduction baffle connection structure comprises a fixing member, a mounting hole being formed on the outer wall of the cylinder head, one end of the fixing member passing through the noise reduction baffle, the mounting hole and the chain cavity in sequence and being fixedly connected to the fixing member, the other end of the fixing member having a fixing stop edge for pressing the noise reduction baffle against the outer wall of the cylinder head, a sealing member being provided between the fixing stop edge and the cylinder head and capable of sealing the mounting hole.

[0009] The noise reduction baffle is arranged outside the cylinder head, and a mounting hole is opened on the outer wall of the cylinder head. One end of the fixing piece is passed through the noise reduction baffle, the mounting hole and the chain cavity in sequence and fixedly connected to the fixing part in the cylinder head. At this time, the other end of the fixing piece has a fixed stop edge, and the fixed stop edge presses the noise reduction baffle against the outer wall of the cylinder head. The sealing piece arranged between the fixed stop edge and the cylinder head can seal the mounting hole, thereby preventing the oil in the chain cavity from flowing out. By extending one end of the fixing piece into the cylinder head and fixedly connecting it to the fixing part, and pressing the noise reduction baffle against the cylinder head, there are two connection points between the fixing piece and the cylinder head, thereby enhancing the connection strength between the fixing piece and the cylinder head. , and can also ensure the sealing of the chain cavity, so that the connection structure of the noise reduction baffle does not affect the installation and use of the internal components of the engine, and the noise reduction baffle can be pressed by the fixed connection at one end of the fixing piece, and the outer wall of the cylinder head has a reaction force that pushes the other end of the fixing piece outward, so that the connection between one end of the fixing piece and the fixed part can be further tightened, ensuring a stable connection between one end of the fixing piece and the fixed part, and at the same time, the fixed stop edge of the fixing piece can be pressed on the outer wall of the cylinder head, so that the connection between the noise reduction baffle and the cylinder head is more stable, further improving the stability of the noise reduction baffle connection structure.

[0010] In the above-mentioned engine noise reduction baffle connection structure, the fixing member is a fixing bolt, one end of which has a sealing shoulder abutting against the side wall of the fixing portion and a connecting portion threadedly connected to the fixing portion.

[0011] By threading the connecting part and the fixing part, the connection of the fixing bolt is more convenient, and the setting of the sealing shoulder makes it possible to limit the connection by abutting against the side wall of the fixing part when the connecting part is in place, thereby improving the stability of the fixing bolt connection.

[0012] In the above-mentioned engine noise reduction baffle connection structure, the fixing part has a columnar connecting seat, a threaded hole is provided on the connecting seat for the connecting part to be embedded, a clearance groove is provided between the connecting part and the sealing shoulder, the hole wall of the threaded hole covers the notch of the clearance groove, and the end face of the sealing shoulder is in contact with the end face of the connecting seat.

[0013] The setting of the connecting seat enhances the guiding area between the connecting part and the fixing part, and improves the stability of the connection between the connecting part and the fixing part; and the position setting of the yield groove enables the sealing shoulder to fit with the end face of the connecting seat as the connecting part is connected after the connecting part and the connecting seat are threadedly connected, thereby avoiding the influence of the chamfer between the sealing shoulder and the connecting part so that the sealing shoulder cannot fit with the end face of the connecting seat, thereby further improving the stability of the connection between the fixing part and the fixing part.

[0014] In the above-mentioned engine noise reduction baffle connection structure, the sealing shoulder has a guide surface, and the guide surface is a conical surface, and the guide surface gradually tilts outward from an end away from the connection part to an end close to the connection part.

[0015] The setting of the guide surface allows the diameter of the entire sealing shoulder to gradually increase in the guide surface portion, so that the end face of the connecting seat can be set in the middle of the end of the sealing shoulder, making the abutment between the sealing shoulder and the connecting seat more stable, further improving the stability of the connection between the fixing piece and the fixing part.

[0016] In the above-mentioned noise reduction baffle connecting structure of the engine, an annular sealing groove is provided on the outer side wall of the sealing member, and the noise reduction baffle has a sealing portion embedded in the sealing groove.

[0017] The setting of the sealing groove ensures that the oil and air in the cylinder head cannot flow out from the gap of the fixed baffle or the noise reduction baffle, thereby improving the sealing of the noise reduction baffle connection structure after assembly, and further improving the stability of the connection structure during use.

[0018] In the above-mentioned noise reduction baffle connection structure of the engine, the sealing member is a sealing gasket, which is sleeved on the fixing member, and has multiple sealing protrusions on the end faces at both ends of the sealing gasket. The sealing protrusion at one end of the sealing gasket abuts against the outer wall of the cylinder head, and the sealing protrusion at the other end of the sealing gasket abuts against the fixed baffle, and the inner wall of the sealing member fits against the outer wall of the fixing member.

[0019] The seal is a sealing gasket, which makes the installation of the seal more convenient, and the use of sealing materials makes the sealing of the seal more stable. The setting of the sealing protrusion makes it easier for the seal to deform when under pressure. After the deformation, the contact area between the seal and the outer wall of the cylinder head and the contact area between the seal and the fixed baffle edge can be increased, thereby further improving the sealing effect of the connection structure, and then improving the stability of the connection structure.

[0020] In the above-mentioned engine noise reduction baffle connection structure, the mounting hole includes a mounting countersunk hole, and the sealing member abuts against a step surface of the mounting countersunk hole.

[0021] The setting of the mounting countersunk hole can minimize the protruding height of the fixing part after the seal is installed, and can also make the placement of the seal more convenient, and can play a role in pre-positioning the seal, thereby making the installation of the connection structure more convenient.

[0022] In the above-mentioned engine noise reduction baffle connection structure, the mounting hole also includes a through hole connected to the mounting countersunk hole, the fixing piece is passed through the mounting countersunk hole and the through hole, and there is a clearance gap between the outer wall of the fixing piece and the hole wall of the through hole.

[0023] The setting of the clearance ensures that the other end of the fixing does not need to be against the outer wall of the cylinder head during installation, thereby reducing the friction of the fixing during installation and providing a larger installation space for one end of the fixing, allowing a certain error during the assembly process and facilitating the installation of the fixing. At the same time, it can also reduce the impact of the cylinder head on the other end of the fixing, reduce the vibration of the other end of the fixing and the noise reduction partition, and improve the stability of the connection structure.

[0024] In the above-mentioned noise reduction baffle connection structure of the engine, the inner wall of the noise reduction baffle is provided with at least one fixing buckle, and the outer wall of the cylinder head is provided with a slot corresponding to the fixing buckle one by one, and the fixing buckle can be embedded in the corresponding slot.

[0025] By setting the fixing buckle and the slot, the noise reduction baffle can be pre-positioned, the connection points between the noise reduction baffle and the cylinder head are increased, and the connection strength of the fixing part is increased. The slot is opened on the outer wall of the cylinder head and does not penetrate the outer wall of the cylinder head, so that the cylinder head does not need to be equipped with a seal here, further improving the convenience and stability of the installation of the noise reduction baffle.

[0026] In the above-mentioned engine noise reduction baffle connection structure, the fixing buckle is arranged at the upper end of the noise reduction baffle, and the fixing member is located at the lower end of the noise reduction baffle.

[0027] By arranging connection points on the upper and lower sides of the noise reduction baffle, the connection between the noise reduction baffle and the cylinder head is made more stable.

[0028] Compared with the prior art, the noise reduction baffle connection structure of the engine has the following advantages:

[0029] 1. By extending one end of the fixing piece into the cylinder head and fixedly connecting it with the fixing part, and pressing the noise reduction baffle onto the cylinder head, there are two connection points between the fixing piece and the cylinder head, and the noise reduction baffle can be pressed by the fixed connection at one end of the fixing piece. The outer wall of the cylinder head has a reaction force that pushes the other end of the fixing piece outward, so that the connection between one end of the fixing piece and the fixing part can be further tightened, thereby ensuring a stable connection between one end of the fixing piece and the fixing part.

[0030] 2. By providing a sealing member, the fixed retaining edge is achieved by pressing the sealing member and the noise reduction partition in the sealing groove at the same time, thereby sealing the mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the noise reduction baffle connection structure of the engine after assembly.

[0032] Figure 2 It is a side view of the noise reduction baffle connection structure of the engine after assembly.

[0033] Figure 3 yes Figure 2 Sectional view of AA.

[0034] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0035] Figure 5 yes Figure 2 Cross-sectional view of BB.

[0036] Figure 6 It is a structural schematic diagram of the noise reduction baffle in the noise reduction baffle connection structure of the engine.

[0037] In the figure, 1, cylinder head; 11, fixing part; 11a, connecting seat; 11a1, threaded hole; 12, mounting countersunk hole; 12a, step surface; 13, slot; 14, chain cavity; 15, through hole; 2, fixing part; 21, fixing stop edge; 22, sealing stop shoulder; 22a, guide surface; 23, connecting part; 24, clearance groove; 3, noise reduction baffle; 31, sealing part; 32, fixing buckle; 4, sealing part; 41, sealing groove; 42, sealing protrusion; 5, clearance gap; 6, cylinder head; 7, sprocket. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0039] Embodiment 1

[0040] like Figure 1 As shown, the noise reduction baffle connection structure of the engine comprises a cylinder head 1 and a noise reduction baffle 3 arranged outside the cylinder head 1, a fixing portion 11 is provided inside the cylinder head 1, a chain cavity 14 is formed between the fixing portion 11 and the inner wall of the cylinder head 1, a cylinder head 6 is provided on the cylinder head 1, and the upper end of the noise reduction baffle 3 is located outside the cylinder head 6.

[0041] Specifically, Figure 1-6As shown, the noise reduction baffle connection structure includes a fixing member 2, a mounting hole is opened on the outer wall of the cylinder head 1, one end of the fixing member 2 passes through the noise reduction baffle 3, the mounting hole and the chain cavity 14 in sequence and is fixedly connected to the fixing portion 11, and the other end of the fixing member 2 has a fixed stop edge 21 for pressing the noise reduction baffle 3 against the outer wall of the cylinder head 1, and a sealing member 4 for sealing the mounting hole is provided between the fixed stop edge 21 and the cylinder head 1.

[0042] The noise reduction baffle 3 is arranged outside the cylinder head 1, and a mounting hole is opened on the outer wall of the cylinder head 1. One end of the fixing member 2 is passed through the noise reduction baffle 3, the mounting hole and the chain cavity 14 in sequence and fixedly connected to the fixing part 11 in the cylinder head 1. At this time, the other end of the fixing member 2 has a fixed stop edge 21, and the fixed stop edge 21 presses the noise reduction baffle 3 on the outer wall of the cylinder head 1. A sealing member 4 is provided between the fixed stop edge 21 and the cylinder head to seal the mounting hole, thereby preventing the oil in the chain cavity 14 from flowing out. By extending one end of the fixing member 2 into the cylinder head 1 and fixedly connecting it to the fixing part 11, and pressing the noise reduction baffle 3 on the cylinder head 1, there are two connection points between the fixing member 2 and the cylinder head 1, which enhances the fixing member 2 and the cylinder head 1. The connection strength between them can also ensure the sealing of the chain cavity 14, so that the connection structure of the noise reduction baffle 3 does not affect the installation and use of the internal components of the engine, and the noise reduction baffle 3 can be pressed by the fixed connection at one end of the fixing piece 2. The outer wall of the cylinder head 1 has a reaction force that pushes the other end of the fixing piece 2 outward, so that the connection between one end of the fixing piece 2 and the fixing part 11 can be further tightened, ensuring a stable connection between one end of the fixing piece 2 and the fixing part 11. At the same time, the fixing piece 2 can be pressed on the outer wall of the cylinder head 1 through the fixed stop edge 21, so that the connection between the noise reduction baffle 3 and the cylinder head 1 is more stable, further improving the stability of the noise reduction baffle connection structure.

[0043] When the engine is running, the sprocket 7 drives the chain to rotate, which generates a relatively large noise. Therefore, the noise reduction baffle 3 is arranged on the outer side of the cylinder head 1 close to the chain cavity 14 .

[0044] like Figure 3 and Figure 4 As shown, the seal 4 is a sealing gasket, and an annular sealing groove 41 is provided on the outer wall of the seal 4. The noise reduction baffle 3 has a sealing portion 31 embedded in the sealing groove 41. The sealing gasket is sleeved on the fixing member 2. The end faces of both ends of the sealing gasket are provided with a plurality of sealing protrusions 42. The sealing protrusion 42 at one end of the sealing gasket abuts against the outer wall of the cylinder head 1, and the sealing protrusion 42 at the other end of the sealing gasket abuts against the fixed stop 21. The inner wall of the sealing gasket fits against the outer wall of the fixing member 2.

[0045] like Figure 4As shown, the mounting hole includes a mounting countersunk hole 12 and a through hole 15 connected to the mounting countersunk hole 12, the sealing member 4 abuts against the step surface 12a of the mounting countersunk hole 12, the fixing member 2 is penetrated through the mounting countersunk hole 12 and the through hole 15, and a clearance gap 5 is provided between the outer wall of the fixing member 2 and the hole wall of the through hole 15.

[0046] like Figure 3 and Figure 4 As shown, the fixing member 2 is a fixing bolt, one end of which has a sealing shoulder 22 abutting against the side wall of the fixing portion 11 and a connecting portion 23 threadedly connected to the fixing portion 11, a clearance groove 24 is provided between the connecting portion 23 and the sealing shoulder 22, the fixing portion 11 has a strip-shaped connecting seat 11a, a threaded hole 11a1 is provided on the connecting seat 11a for the connecting portion 23 to be embedded, the hole wall of the threaded hole 11a1 blocks the notch of the clearance groove 24, and the end face of the sealing shoulder 22 fits with the end face of the connecting seat 11a, the sealing shoulder 22 has a guide surface 22a, the guide surface 22a is a conical surface, and the guide surface 22a gradually tilts outward from the end away from the connecting portion 23 to the end close to the connecting portion 23.

[0047] like Figure 5 and Figure 6 As shown, the inner wall of the noise reduction baffle 3 is provided with at least one fixing buckle 32, and the outer wall of the cylinder head 1 is provided with a slot 13 which is arranged one-to-one with the fixing buckle 32. The fixing buckle 32 can be embedded in the corresponding slot 13. The fixing buckle 32 is arranged at the upper end of the noise reduction baffle 3, and the fixing part 2 is located at the lower end of the noise reduction baffle 3.

[0048] Embodiment 2

[0049] The content of this embodiment is basically the same as that of the first embodiment, except that the fixing member 2 is a rivet, one end of which can pass through the noise reduction baffle 3 and the chain cavity 14 in sequence and be fixedly connected to the fixing portion 11, and the other end of the rivet presses the noise reduction baffle 3 and the sealing member 4 against the outer wall of the cylinder head 1.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A noise reduction baffle connection structure for an engine, the engine comprising a cylinder head (1) and a noise reduction baffle (3) arranged outside the cylinder head (1), the cylinder head (1) having a fixing portion (11) therein, a chain cavity (14) being formed between the fixing portion (11) and an inner wall of the cylinder head (1), characterized in that: The noise reduction baffle connection structure comprises a fixing member (2), a mounting hole is provided on the outer wall of the cylinder head (1), one end of the fixing member (2) passes through the noise reduction baffle (3), the mounting hole and the chain cavity (14) in sequence and is fixedly connected to the fixing portion (11), the other end of the fixing member (2) has a fixing stop edge (21) for pressing the noise reduction baffle (3) against the outer wall of the cylinder head (1), a sealing member (4) capable of sealing the mounting hole is provided between the fixing stop edge (21) and the cylinder head (1), and a sealing member (4) is provided on the outer wall of the sealing member (4). A ring-shaped sealing groove (41) is provided, the noise reduction baffle (3) has a sealing portion (31) embedded in the sealing groove (41), the inner wall of the noise reduction baffle (3) has at least one fixing buckle (32), the outer wall of the cylinder head (1) is provided with a clamping groove (13) arranged in a one-to-one correspondence with the fixing buckle (32), the fixing buckle (32) can be embedded in the corresponding clamping groove (13), the fixing buckle (32) is arranged at the upper end of the noise reduction baffle (3), and the fixing member (2) is located at the lower end of the noise reduction baffle (3).

2. The engine noise reduction baffle connection structure according to claim 1, characterized in that: The fixing member (2) is a fixing bolt, one end of which has a sealing shoulder (22) abutting against a side wall of the fixing portion (11) and a connecting portion (23) threadedly connected to the fixing portion (11).

3. The engine noise reduction baffle connection structure according to claim 2, characterized in that: The fixing portion (11) has a columnar connection seat (11a), the connection seat (11a) is provided with a threaded hole (11a1) for the connection portion (23) to be embedded, a clearance groove (24) is provided between the connection portion (23) and the sealing shoulder (22), the hole wall of the threaded hole (11a1) covers the notch of the clearance groove (24), and the end surface of the sealing shoulder (22) is in contact with the end surface of the connection seat (11a).

4. The engine noise reduction baffle connection structure according to claim 3, characterized in that: The sealing shoulder (22) has a guide surface (22a), the guide surface (22a) is a conical surface, and the guide surface (22a) gradually tilts outwards from an end away from the connecting portion (23) to an end close to the connecting portion (23).

5. The engine noise reduction baffle connection structure according to claim 1, characterized in that: The sealing member (4) is a sealing gasket, which is sleeved on the fixing member (2). The end faces of both ends of the sealing gasket are provided with a plurality of sealing protrusions (42). The sealing protrusions (42) at one end of the sealing gasket abut against the outer wall of the cylinder head (1), and the sealing protrusions (42) at the other end of the sealing gasket abut against the fixing stop edge (21). The inner side wall of the sealing gasket fits against the outer side wall of the fixing member (2).

6. The engine noise reduction baffle connection structure according to claim 1, characterized in that: The mounting hole comprises a mounting countersunk hole (12), and the sealing member (4) abuts against a step surface (12a) of the mounting countersunk hole (12).

7. The engine noise reduction baffle connection structure according to claim 6, characterized in that: The mounting hole further comprises a through hole (15) connected to the mounting countersunk hole (12); the fixing member (2) is inserted through the mounting countersunk hole (12) and the through hole (15); and a clearance gap (5) is provided between the outer wall of the fixing member (2) and the hole wall of the through hole (15).

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