Oil return path structure of engine

Abstract

The utility model provides an oil return path structure of an engine, and belongs to the technical field of engines. The oil return path structure solves the problem that an existing oil return path structure is poor in heat dissipation and heat insulation effect. According to the oil return path structure of the engine, the engine comprises a cylinder head, a cylinder body arranged below the cylinder head and provided with a combustion chamber and a box body arranged below the cylinder body, a cam shaft chamber is arranged at the upper end of the cylinder head, the oil return path structure comprises an oil return path formed in the cylinder body, and the cam shaft chamber is provided with a bottom wall arranged obliquely downwards. The oil return path structure further comprises a heat insulation oil cavity formed in the side wall of the cylinder body, and the heat insulation oil cavity is located between the combustion chamber and the outer side wall of the cylinder body. According to the oil return path structure of the engine, the combustion chamber can be subjected to heat insulation through lubricating oil in the heat insulation oil cavity, most heat is prevented from being transmitted to the outer side wall of the cylinder body, and the lubricating oil in the heat insulation oil cavity can also be subjected to heat dissipation through outside cold air and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines and relates to an oil return circuit structure of an engine. Background Art

[0002] The motorcycle engine is the power unit when the motorcycle is running. When the power unit is running, lubricating oil is needed to lubricate various parts of the engine to reduce the wear of parts. During the lubrication process, the oil in the oil pan is usually pumped into the camshaft chamber through an oil pump. After lubricating the camshaft, etc., it flows downward from the camshaft chamber to the oil pan, realizing the recycling of the lubricating oil.

[0003] For example, Chinese patent application [Authorization Announcement No.: CN218669593U] discloses an oil return structure for a cylinder head of a motorcycle engine, wherein the engine comprises a casing, a crankshaft assembly installed in the casing, and an oil pan fixedly connected to the bottom of the casing, the cylinder head is fixedly connected to the top of the casing, the oil return structure comprises an oil return channel arranged obliquely downward in the cylinder head, the oil outlet of the oil return channel penetrates the inner wall of the casing, the oil return structure also comprises an arc-shaped oil guide wall in the casing wall, the oil guide wall protrudes toward the crankshaft assembly, the top of the oil guide wall is located directly below the oil outlet of the oil return channel, and the bottom is located above the oil storage cavity of the oil pan.

[0004] In the above-mentioned oil return structure, the lubricating oil of the cylinder head flows directly into the casing through the oil return channel. Although fast oil return is achieved, the temperature of various components of the engine is high during operation. Although a heat sink is provided at the cylinder head to dissipate heat to the cylinder head, the temperature inside the cylinder is still high. When riding, people need to keep the inner side of their legs close to the engine, and the above-mentioned structure cannot insulate the cylinder body or the cylinder head, which makes riding inconvenient due to the high temperature of the engine casing, and also affects the heat dissipation effect of the lubricating oil itself. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and propose an engine oil return circuit structure. The technical problem to be solved by the utility model is: how to solve the problem of poor heat dissipation and heat insulation effect of the existing oil return circuit structure.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A return oil circuit structure of an engine, the engine includes a cylinder head, a cylinder block arranged under the cylinder head and having a combustion chamber, and a box body arranged under the cylinder body, the upper end of the cylinder head has a camshaft chamber, the return oil circuit structure includes an return oil circuit opened on the cylinder body, characterized in that the camshaft chamber has a bottom wall arranged obliquely downward, the lower end of the bottom wall is provided with an oil outlet 1 connected to the return oil circuit, the return oil circuit structure also includes a heat-insulating oil cavity opened in the side wall of the cylinder body, the heat-insulating oil cavity is located between the combustion chamber and the outer wall of the cylinder body, the middle part of the bottom wall is provided with an oil outlet 2 connected to the heat-insulating oil cavity, and the oil outlet of the return oil circuit and the oil outlet of the heat-insulating oil cavity are both connected to the inner cavity of the box body.

[0008] Working principle: The lubricating oil at the bottom of the engine flows upward through the oil pump. After flowing to the camshaft chamber of the cylinder head to lubricate its components, the lubricating oil will flow into the oil return path and the heat-insulating oil chamber through the oil outlet 1 and oil outlet 2 of the camshaft chamber respectively. Since the oil outlet 1 is located at the lower end of the bottom of the camshaft chamber, the lubricating oil in the camshaft chamber can be returned to the inner cavity of the case through the oil outlet 1, and part of the lubricating oil can flow into the heat-insulating oil chamber through the oil outlet 2. Since the heat-insulating oil chamber is located between the combustion chamber and the outer wall of the cylinder body, When the engine is running, the temperature in the combustion chamber is high, and the combustion chamber can be insulated by the lubricating oil in the heat-insulating oil chamber to prevent most of the heat from being transferred to the outer wall of the cylinder body. Since the heat-insulating oil chamber is opened on the side wall of the cylinder body, the lubricating oil in the heat-insulating oil chamber can also dissipate heat through external cold air, thereby further improving the heat insulation effect of the heat-insulating oil chamber. Finally, the heat-insulating oil chamber also flows from the cylinder body into the inner cavity of the case, so that the camshaft chamber can further speed up the efficiency of oil return through the setting of oil outlet one and oil outlet two.

[0009] In the above-mentioned oil return circuit structure of the engine, a cooling water jacket surrounding the combustion chamber is provided on the cylinder body, and the heat-insulating oil cavity is located outside the cooling water jacket.

[0010] The setting of the cooling water jacket on the cylinder block can provide initial cooling for the combustion chamber. The heat of the combustion chamber will be transferred to the coolant in the cooling water jacket. The lubricating oil in the outermost insulating oil cavity has a lower temperature, which can further cool the coolant, thereby achieving the purpose of enhancing the cooling effect of the combustion chamber in the cylinder block and achieving a heat insulation effect.

[0011] In the above-mentioned oil return circuit structure of the engine, the transverse cross-section of the heat-insulating oil chamber is in the shape of an elongated strip and is arranged along the outer side wall of the cylinder body, and both ends of the heat-insulating oil chamber are bent toward the combustion chamber.

[0012] The insulating oil chamber adopts a long strip design, which can contact with the cooling water jacket to the greatest extent, thereby improving the cooling effect of the lubricating oil on the cooling water jacket, and also increases the outer side of the insulating oil chamber, so that the contact area between the insulating oil chamber and the external cold air is maximized, which is more convenient for the self-heat dissipation of the lubricating oil in the insulating oil chamber.

[0013] In the above-mentioned oil return circuit structure of the engine, a sealing gasket is arranged on the upper end surface of the cylinder body, and the cylinder head presses the sealing gasket against the cylinder body. The upper part of the cylinder body is also provided with a clearance cavity connected to the heat-insulating oil cavity.

[0014] The setting of the sealing gasket ensures the sealing effect after the connection between the cylinder body and the cylinder head, and does not affect the opening of the thermal insulation oil chamber. The setting of the yield chamber allows the lubricating oil in the cylinder head to flow stably into the thermal insulation oil chamber, thereby ensuring the sealing effect between the cylinder head and the cylinder body while improving the heat insulation and heat dissipation effects of the thermal insulation oil chamber.

[0015] In the above-mentioned oil return circuit structure of the engine, the give way cavity is arranged close to the oil return circuit.

[0016] The arrangement of this structure enables the position of the give-way chamber to be arranged downward, so that as much lubricating oil as possible in the camshaft chamber can flow into the give-way chamber through the second oil outlet, thereby ensuring that there is enough lubricating oil in the give-way chamber, thereby reducing the influence of the arrangement of the support plate on the insulating oil chamber, and maximizing the insulation and heat dissipation effect of the oil return circuit structure.

[0017] In the above-mentioned oil return circuit structure of the engine, a long strip-shaped guide oil passage is opened in the outer wall of the cylinder head, the oil inlet of the guide oil passage is connected with the second oil outlet, and the oil outlet of the guide oil passage is connected with the give way cavity.

[0018] The setting of the guide oil channel can enable the lubricating oil in the camshaft chamber to quickly flow into the guide oil channel, be buffered in the guide oil channel, and then slowly flow into the give way cavity, thereby achieving better heat dissipation and heat insulation effects of the insulation oil channel.

[0019] In the above-mentioned engine oil return circuit structure, the cylinder body has a partition block separating the insulating oil chamber from the upper part of the oil return circuit, the insulating oil chamber is located in the middle of the outer side of the cylinder body, and the oil return circuit is located at one end of the outer side of the cylinder body.

[0020] The setting of the partition block ensures that the oil in the insulating oil chamber can flow fully in the insulating oil chamber, and at the same time the oil in the return oil circuit can also achieve rapid reflux, so that the insulating oil chamber and the return oil circuit do not affect each other, and the heat insulation and heat dissipation effects of the insulating oil chamber are not affected while ensuring the oil return effect.

[0021] In the above-mentioned oil return circuit structure of the engine, the bottom of the heat-insulating oil chamber is communicated with the bottom of the oil return circuit, and the oil outlet of the heat-insulating oil chamber is communicated with the oil inlet of the inner cavity of the casing.

[0022] The setting of this structure requires less change to the box body, and is also convenient for the oil return of the insulating oil chamber. The lubricating oil with a lower temperature in the return oil circuit is mixed with the lubricating oil with a higher temperature in the insulating oil chamber, so that the oil temperature of the lubricating oil entering the box body is reduced, and it can also lubricate and cool the parts in the box body.

[0023] In the above-mentioned oil return passage structure of the engine, the diameter of the oil return passage gradually decreases from the end close to the cylinder head to the end far from the cylinder head.

[0024] The arrangement of this structure enables the oil return channel to quickly allow the oil in the camshaft chamber to quickly enter the oil return channel from the oil outlet, and can also dissipate heat for the lubricating oil in the combustion chamber or the insulation oil channel during the oil return process.

[0025] Compared with the prior art, the oil return circuit structure of this engine has the following advantages:

[0026] 1. Since the heat-insulating oil chamber is located between the combustion chamber and the outer wall of the cylinder block, the temperature in the combustion chamber is high when the engine is running. The combustion chamber can be insulated by the lubricating oil in the heat-insulating oil chamber to prevent most of the heat from being transferred to the outer wall of the cylinder block. Since the heat-insulating oil chamber is opened on the side wall of the cylinder block, the lubricating oil in the heat-insulating oil chamber can also dissipate its own heat through external cold air, thereby further improving the heat-insulating effect of the heat-insulating oil chamber. Finally, the heat-insulating oil chamber also flows from the cylinder block into the inner cavity of the case, so that the camshaft chamber can further accelerate the efficiency of oil return through the setting of oil outlet 1 and oil outlet 2.

[0027] 2. The insulating oil chamber adopts a long strip design, which can contact with the cooling water jacket to the greatest extent, thereby improving the cooling effect of the lubricating oil on the cooling water jacket, and also enlarges the outer side of the insulating oil chamber, so that the contact area between the insulating oil chamber and the external cold air is maximized, which is more convenient for the self-heat dissipation of the lubricating oil in the insulating oil chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial top view of the utility model.

[0029] Figure 2 yes Figure 1 Sectional view of AA.

[0030] Figure 3 yes Figure 1 Cross-sectional view of BB.

[0031] Figure 4 yes Figure 1Cross-sectional view of CC.

[0032] Figure 5 It is a front view of the utility model.

[0033] Figure 6 yes Figure 5 Cross-sectional view of DD.

[0034] Figure 7 yes Figure 5 Cross-sectional view of EE.

[0035] Figure 8 yes Figure 5 Cross-sectional view of FF.

[0036] In the figure, 1. cylinder head; 11. camshaft chamber; 11a. oil outlet 1; 11b. oil outlet 2; 11c. bottom wall; 12. guide oil passage; 2. cylinder body; 21. combustion chamber; 22. oil return oil circuit; 23. heat-insulating oil chamber; 24. cooling water jacket; 25. partition block; 3. casing; 31. inner cavity; 4. sealing gasket; 5. give way cavity. DETAILED DESCRIPTION

[0037] 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.

[0038] like Figure 1 and Figure 2 As shown, the oil return circuit structure of the engine comprises a cylinder head 1, a cylinder block 2 provided under the cylinder head 1 and having a combustion chamber 21, and a housing 3 provided under the cylinder block 2. The upper end of the cylinder head 1 has a camshaft chamber 11.

[0039] Specifically, Figure 1-8 As shown, the oil return circuit structure includes an oil return circuit 22 opened on the cylinder block 2, the camshaft chamber 11 has a bottom wall 11c arranged obliquely downward, and an oil outlet 11a connected to the oil return circuit 22 is opened at the lower end of the bottom wall 11c. The oil return circuit structure also includes a heat-insulating oil cavity 23 opened in the side wall of the cylinder block 2, a cooling water jacket 24 arranged around the combustion chamber 21 is opened on the cylinder block 2, the heat-insulating oil cavity 23 is located on the outside of the cooling water jacket 24, and the heat-insulating oil cavity 23 is located between the cooling water jacket 24 and the outer wall of the cylinder block 2, an oil outlet 11b connected to the heat-insulating oil cavity 23 is opened in the middle of the bottom of the camshaft chamber 11, and the oil outlet of the oil return circuit 22 and the oil outlet of the heat-insulating oil cavity 23 are both connected to the inner cavity 31 of the casing 3.

[0040] Working principle: The lubricating oil at the bottom of the engine flows upward through the oil pump, and after flowing to the camshaft chamber 11 of the cylinder head 1 to lubricate its components, the lubricating oil will flow into the oil return path 22 and the heat-insulating oil chamber 23 through the oil outlet 11a and the oil outlet 2 11b of the camshaft chamber 11 respectively. Since the oil outlet 11a is located at the lower end of the bottom of the camshaft chamber 11, it is preferred that the oil outlet 11a be set at the lowest point of the bottom of the camshaft chamber 11, so that the lubricating oil in the camshaft chamber 11 can be returned to the inner cavity 31 of the housing 3 through the oil outlet 11a, and a part of the lubricating oil can flow into the heat-insulating oil chamber 23 through the oil outlet 2 11b. Since the heat-insulating oil chamber 23 is Located between the cooling water jacket 24 and the outer wall of the cylinder block 2, the temperature in the combustion chamber 21 is relatively high when the engine is running, and the combustion chamber 21 can be insulated by the lubricating oil in the heat-insulating oil chamber 23 to prevent most of the heat from being transferred to the outer wall of the cylinder block 2. Since the heat-insulating oil chamber 23 is opened on the side wall of the cylinder block 2, the lubricating oil in the heat-insulating oil chamber 23 can also dissipate its own heat through external cold air, etc., thereby further improving the heat-insulating effect of the heat-insulating oil chamber 23. Finally, the heat-insulating oil chamber 23 also flows from the cylinder block 2 into the inner cavity 31 of the housing 3, so that the camshaft chamber 11 can further accelerate the efficiency of oil return through the setting of the oil outlet 11a and the oil outlet 2 11b.

[0041] like Figure 7 and Figure 8 As shown, the transverse cross section of the heat-insulating oil chamber 23 is in the shape of an elongated strip and is arranged along the outer side wall of the cylinder body 2 , and both ends of the heat-insulating oil chamber 23 are bent toward the direction of the combustion chamber 21 .

[0042] like Figure 2 and Figure 6 As shown, a sealing gasket 4 is arranged on the upper end surface of the cylinder body 2, and the cylinder head 1 presses the sealing gasket 4 against the cylinder body 2. A yield chamber 5 connected to the heat-insulating oil chamber 23 is also provided on the upper part of the cylinder body 2. The yield chamber 5 is arranged close to the return oil passage 22. A long strip-shaped guide oil passage 12 is provided in the outer wall of the cylinder head 1. The oil inlet of the guide oil passage 12 is connected to the second oil outlet 11b, and the oil outlet of the guide oil passage 12 is connected to the yield chamber 5.

[0043] like Figure 2-8 As shown, the cylinder body 2 is provided with a partition block 25 separating the heat-insulating oil chamber 23 from the upper part of the oil return circuit 22, the heat-insulating oil chamber 23 is located in the middle of the outer side of the cylinder body 2, the oil return circuit 22 is located at one end of the outer side of the cylinder body 2, the bottom of the heat-insulating oil chamber 23 is connected with the bottom of the oil return circuit 22, the oil outlet of the heat-insulating oil chamber 23 is connected with the oil inlet of the inner cavity 31 of the casing 3, and the diameter of the oil return circuit 22 gradually decreases from the end close to the cylinder head 1 to the end away from the cylinder head 1.

[0044] 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. An oil return circuit structure of an engine, the engine comprising a cylinder head (1), a cylinder block (2) arranged under the cylinder head (1) and having a combustion chamber (21), and a casing (3) arranged under the cylinder block (2), wherein the upper end of the cylinder head (1) has a camshaft chamber (11), the oil return circuit structure comprising an oil return circuit (22) opened on the cylinder block (2), characterized in that: The oil return circuit structure also includes an insulating oil chamber (23) provided in the side wall of the cylinder body (2); the camshaft chamber (11) has a bottom wall (11c) arranged obliquely downward; an oil outlet (11a) communicating with the oil return circuit (22) is provided at the lower end of the bottom wall (11c); the insulating oil chamber (23) is located between the combustion chamber (21) and the outer wall of the cylinder body (2); an oil outlet (11b) communicating with the insulating oil chamber (23) is provided in the middle of the bottom wall (11c); and the oil outlets of the oil return circuit (22) and the insulating oil chamber (23) are both communicated with the inner cavity (31) of the casing (3).

2. The oil return circuit structure of the engine according to claim 1, characterized in that: The cylinder body (2) is provided with a cooling water jacket (24) arranged around the combustion chamber (21), and the heat-insulating oil chamber (23) is located outside the cooling water jacket (24).

3. The oil return circuit structure of the engine according to claim 2, characterized in that: The transverse cross section of the heat-insulating oil chamber (23) is in the shape of an elongated strip and is arranged along the outer side wall of the cylinder body (2). Both ends of the heat-insulating oil chamber (23) are bent in a direction toward the combustion chamber (21).

4. The oil return circuit structure of the engine according to claim 1, 2 or 3, characterized in that: A sealing gasket (4) is provided on the upper end surface of the cylinder body (2), and the cylinder head (1) presses the sealing gasket (4) against the cylinder body (2). A clearance cavity (5) communicating with the heat-insulating oil cavity (23) is also provided on the upper part of the cylinder body (2).

5. The oil return circuit structure of the engine according to claim 4, characterized in that: The clearance chamber (5) is arranged close to the oil return line (22).

6. The oil return circuit structure of the engine according to claim 4, characterized in that: A long strip-shaped guide oil passage (12) is provided in the outer wall of the cylinder head (1), the oil inlet of the guide oil passage (12) is connected to the second oil outlet (11b), and the oil outlet of the guide oil passage (12) is connected to the clearance chamber (5).

7. The oil return circuit structure of the engine according to claim 1, 2 or 3, characterized in that: The cylinder body (2) is provided with a partition block (25) for separating a heat-insulating oil chamber (23) from the upper part of an oil return passage (22); the heat-insulating oil chamber (23) is located in the middle of the outer side of the cylinder body (2); and the oil return passage (22) is located at one end of the outer side of the cylinder body (2).

8. The oil return circuit structure of the engine according to claim 1, 2 or 3, characterized in that: The bottom of the heat-insulating oil chamber (23) is in communication with the bottom of the oil return passage (22), and the oil outlet of the heat-insulating oil chamber (23) is in communication with the oil inlet of the inner chamber (31) of the casing (3).

9. The oil return circuit structure of the engine according to claim 1, 2 or 3, characterized in that: The diameter of the oil return passage (22) gradually decreases from an end close to the cylinder head (1) to an end far from the cylinder head (1).

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