Engine and vehicle

Abstract

The utility model discloses an engine and a vehicle. The engine comprises an exhaust pipe, a cylinder cover, a bolt, a sleeve and a heat insulation layer. The exhaust pipe comprises a connecting part which is provided with a bolt hole; the sleeve is arranged on one side of the connecting part deviating from the cylinder cover; bolts penetrate through the sleeves and the bolt holes to be connected with the cylinder cover. The heat insulation layer is arranged between the connecting part and the sleeve and is in contact connection with the connecting part and the sleeve. The heat insulation layer in the engine can obviously reduce the temperature subsequently transmitted to the bolt, so that the probability of loosening of the exhaust pipe bolt is reduced, and the reliability of the engine is improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine and a vehicle. Background Art

[0002] The exhaust pipe is a critical engine component, connected to the cylinder head and channeling exhaust from each cylinder into the exhaust manifold. During exhaust, the pipe is subjected to high-temperature exhaust gases, causing the pipe body to heat up and potentially experience significant thermal deformation. During this process, the exhaust pipe bolts are also exposed to high temperatures, causing thermal expansion and potentially loosening, which can lead to failure. Utility Model Content

[0003] The present application discloses an engine and a vehicle, which can effectively improve the phenomenon of exhaust pipe bolt loosening.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides an engine, comprising an exhaust pipe, a cylinder head, bolts, a sleeve, and a heat insulation layer;

[0006] The exhaust pipe includes a connecting portion having a bolt hole;

[0007] The sleeve is arranged on a side of the connecting portion away from the cylinder head;

[0008] The bolt passes through the sleeve and the bolt hole and is connected to the cylinder head;

[0009] The heat insulation layer is arranged between the connecting portion and the sleeve, and is in contact with and connected to the connecting portion and the sleeve.

[0010] The engine provided in this application includes an exhaust pipe, a cylinder head, bolts, a sleeve, and a thermal insulation layer. The exhaust pipe has a connecting portion for connecting to the cylinder head, the connecting portion having a bolt hole, a sleeve located on the side of the connecting portion facing away from the cylinder head, the central axis of the sleeve being aligned with the central axis of the bolt hole, and the screw rod of the bolt passes through the sleeve and is connected to the bolt hole and the cylinder head. The sleeve is used to extend the heat transfer path and transfer time, thereby reducing the amount of heat transferred to the bolt, thereby reducing the probability of the bolt loosening. A thermal insulation layer is provided between the connecting portion and the sleeve, and the thermal insulation layer contacts the connecting portion and the sleeve respectively. With this arrangement, the heat transfer path of the exhaust system is: exhaust pipe → thermal insulation layer → sleeve → exhaust pipe bolt → cylinder head. That is, during the heat transfer process, the thermal resistance of the thermal insulation layer can significantly reduce the temperature subsequently transferred to the bolt, thereby reducing the probability of the exhaust pipe bolt loosening and improving engine reliability.

[0011] In some embodiments, a first gap is formed between the inner wall of the bolt hole and the side wall of the bolt.

[0012] In some embodiments, a second gap is formed between the inner wall of the sleeve and the side wall of the bolt.

[0013] In some embodiments, the thermal insulation layer is fixed to a first surface of the connecting portion, wherein the first surface is a side surface of the connecting portion facing the sleeve.

[0014] In some embodiments, the orthographic projection of the thermal insulation layer on the first surface is greater than or equal to the orthographic projection of the sleeve on the first surface.

[0015] In some embodiments, the heat insulation layer is fixed on a surface of the sleeve facing the connecting portion.

[0016] In some embodiments, the thermal insulation layer is a thermal insulation gasket, and a mounting groove coaxial with the bolt hole is provided on the side of the connecting portion facing the sleeve, and the thermal insulation gasket is provided in the mounting groove.

[0017] In some embodiments, the diameter of the mounting groove is larger than the diameter of the bolt hole; the outer diameter of the sleeve is smaller than or equal to the diameter of the mounting groove and larger than the diameter of the bolt hole.

[0018] In some embodiments, a sealing gasket is provided between the exhaust pipe connecting portion and the cylinder head.

[0019] In a second aspect, the present application provides a vehicle comprising the engine as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of an engine provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a partial structure of an engine provided in an embodiment of the present application;

[0022] Icons: 1. Exhaust pipe; 11. Connecting part; 12. Mounting groove; 2. Cylinder head; 3. Bolt; 31. Screw; 32. Nut; 4. Sleeve; 5. Insulation layer; 6. Sealing gasket; A. First gap; B. Second gap. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0025] First, as Figure 1 As shown, an embodiment of the present application provides an engine, comprising an exhaust pipe 1, a cylinder head 2, a bolt 3, a sleeve 4 and a heat insulation layer 5;

[0026] The exhaust pipe 1 includes a connecting portion 11 having a bolt hole;

[0027] The sleeve 4 is arranged on the side of the connecting portion 11 away from the cylinder head 2;

[0028] Bolt 3 passes through sleeve 4 and bolt hole to connect with cylinder head 2;

[0029] The heat insulating layer 5 is disposed between the connecting portion 11 and the sleeve 4 , and is in contact with and connected to the connecting portion 11 and the sleeve 4 .

[0030] The engine provided in this application includes an exhaust pipe 1, a cylinder head 2, bolts 3, a sleeve 4, and a thermal insulation layer 5. The exhaust pipe 1 has a connecting portion 11 for connecting to the cylinder head 2. The connecting portion 11 has a bolt hole. The sleeve 4 is located on the side of the connecting portion 11 facing away from the cylinder head 2. The central axis of the sleeve 4 is the same as the central axis of the bolt hole. The screw 31 of the bolt 3 passes through the sleeve 4 and is connected to the bolt hole and the cylinder head 2. The cylinder head 2 has a connecting hole. The screw 31 is inserted into the connecting hole and connected to the cylinder head 2, such as a threaded connection. The sleeve 4 is used to extend the heat transfer path and transfer time, thereby reducing the heat transferred to the bolt 3, thereby reducing the probability of the bolt 3 loosening. A thermal insulation layer 5 is provided between the connection 11 and the sleeve 4, and contacts both the connection 11 and the sleeve 4. This arrangement creates a heat transfer path for the exhaust system: exhaust pipe 1 → thermal insulation layer 5 → sleeve 4 → bolt 3 → cylinder head 2. During heat transfer, the thermal resistance of the thermal insulation layer 5 significantly reduces the temperature subsequently transferred to the bolt 3, thereby reducing the likelihood of the exhaust pipe bolt 3 loosening and improving engine reliability. The thermal insulation layer 5 can be a thermal expansion coating. Simulations show that the temperature of the bolt 3 can be reduced by 33.1°C, a 13% decrease.

[0031] In some embodiments, as Figure 1 As shown, a first gap A is defined between the inner wall of the bolt hole and the side wall of the bolt 3. In other words, the diameter of the bolt hole is larger than the outer diameter of the bolt 3, meaning that the connecting portion 11 and the bolt 3 are not in direct contact. This prevents heat from the connecting portion 11 from being directly transferred to the screw 31 of the bolt 3, thereby achieving the purpose of cooling and heat insulation, and ensuring the fastening reliability of the bolt 3.

[0032] In some embodiments, as Figure 1 As shown, a second gap B is formed between the inner wall of the sleeve 4 and the side wall of the bolt 3. In other words, the inner diameter of the sleeve 4 is larger than the outer diameter of the bolt 3, i.e., the sleeve 4 and the bolt 3 are not in direct contact, thereby preventing the heat of the sleeve 4 from being directly transferred to the screw 31 of the bolt 3, thereby achieving the purpose of cooling and heat insulation, and ensuring the fastening reliability of the bolt 3.

[0033] In some embodiments, as Figure 2 As shown, the thermal insulation layer 5 is fixed to the first surface of the connecting portion 11, wherein the first surface is the side of the connecting portion 11 facing the sleeve 4. With this arrangement, when heat from the connecting portion 11 is transferred to the sleeve 4, it must first pass through the thermal insulation layer 5. Due to the thermal resistance of the thermal insulation layer 5, the temperature subsequently transferred to the bolt 3 can be significantly reduced, thereby reducing the probability of the exhaust pipe bolt 3 loosening and improving engine reliability.

[0034] In some embodiments, as Figure 2As shown, the positive projection of the thermal insulation layer 5 on the first surface is greater than or equal to the positive projection of the sleeve 4 on the first surface, so that the thermal insulation layer 5 can fully block the heat transfer between the connecting portion 11 and the sleeve 4, thereby reducing the probability of the exhaust pipe bolt 3 loosening.

[0035] In some embodiments, as Figure 2 As shown, the heat insulation layer 5 can also be fixed on the side surface of the sleeve 4 facing the connection portion 11. In this case, the area of ​​the heat insulation layer 5 should be equal to the area of ​​the side surface of the sleeve 4 facing the connection portion 11, so that the heat insulation layer 5 can fully block the heat transfer between the connection portion 11 and the sleeve 4, thereby reducing the probability of the exhaust pipe bolt 3 becoming loose.

[0036] It should be noted that a heat insulating layer 5 may also be provided on the surface of the sleeve 4 facing away from the connecting portion 11 . The heat insulating layer 5 contacts the nut 32 of the bolt 3 to further reduce heat transfer between the sleeve 4 and the bolt 3 .

[0037] In some embodiments, as Figure 1 As shown, the heat insulation layer 5 is a heat insulation gasket, and a mounting groove 12 coaxial with the bolt hole is provided on the side of the connecting portion 11 facing the sleeve 4, and the heat insulation gasket is arranged in the mounting groove 12. The mounting groove 12 can fix the position of the heat insulation gasket.

[0038] In some embodiments, as Figure 1 As shown, the diameter of the mounting groove 12 is larger than the diameter of the bolt hole to facilitate installation and positioning of the thermal insulation gasket. The outer diameter of the sleeve 4 is less than or equal to the diameter of the mounting groove 12 and larger than the diameter of the bolt hole, so that the surface of the sleeve 4 facing the connection portion 11 contacts the thermal insulation gasket and does not sink into the bolt hole. It should be noted that the area of ​​the upper surface of the thermal insulation gasket should be greater than or equal to the area of ​​the surface of the sleeve 4 facing the connection portion 11, so that the thermal insulation layer 5 can effectively block heat transfer between the connection portion 11 and the sleeve 4, thereby reducing the probability of the exhaust pipe bolt 3 loosening.

[0039] In some embodiments, as Figure 1 As shown, a sealing gasket 6 is provided between the exhaust pipe connecting portion 11 and the cylinder head 2 to improve the connection stability between the connecting portion 11 and the cylinder head 2 and reduce heat transfer.

[0040] In a second aspect, the present invention further provides a vehicle comprising the engine provided in the first aspect. Since the vehicle includes all the technical features of the engine, the vehicle also includes all the beneficial effects of the engine, which will not be described in detail here.

[0041] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. An engine, characterized in that: Includes exhaust pipe, cylinder head, bolts, sleeves and insulation; The exhaust pipe includes a connecting portion having a bolt hole; The sleeve is arranged on a side of the connecting portion away from the cylinder head; The bolt passes through the sleeve and the bolt hole and is connected to the cylinder head; The heat insulation layer is arranged between the connecting portion and the sleeve, and is in contact with and connected to the connecting portion and the sleeve.

2. The engine according to claim 1, characterized in that A first gap is formed between the inner wall of the bolt hole and the side wall of the bolt.

3. The engine according to claim 2, characterized in that A second gap is formed between the inner wall of the sleeve and the side wall of the bolt.

4. The engine according to claim 3, characterized in that The heat insulation layer is fixed on a first surface of the connecting portion, wherein the first surface is a side surface of the connecting portion facing the sleeve.

5. The engine according to claim 4, characterized in that The orthographic projection of the heat insulation layer on the first surface is greater than or equal to the orthographic projection of the sleeve on the first surface.

6. The engine according to claim 3, characterized in that The heat insulation layer is fixed on a surface of the sleeve facing the connecting portion.

7. The engine according to claim 3, characterized in that The heat insulation layer is a heat insulation gasket, and a mounting groove coaxial with the bolt hole is provided on a side of the connecting portion facing the sleeve, and the heat insulation gasket is arranged in the mounting groove.

8. The engine according to claim 7, characterized in that The diameter of the mounting groove is larger than the diameter of the bolt hole; the outer diameter of the sleeve is smaller than or equal to the diameter of the mounting groove and larger than the diameter of the bolt hole.

9. The engine according to claim 8, characterized in that A sealing gasket is provided between the exhaust pipe connecting portion and the cylinder head.

10. A vehicle, characterized in that: Comprising an engine as described in any one of claims 1-9.

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