A warm-up structure for an engine

Abstract

The present invention provides a warm-up structure for an engine, belonging to the technical field of motorcycles. It solves the technical problem that the warm-up speed of the existing motorcycle engine is not fast enough. For the warm-up structure of this engine, the engine includes a cylinder head, and a first water jacket is arranged in the cylinder head around the combustion chamber. An exhaust port for discharging combustion exhaust gas is provided on the outer peripheral surface of the cylinder head. The warm-up structure includes a liquid outlet channel whose outer end can communicate with a radiator water tank. The liquid outlet channel is located at the exhaust port on the cylinder head. The liquid outlet channel and the exhaust port are both located on the same side of the outer periphery of the cylinder head. The inner end of the liquid outlet channel communicates with the first water jacket. The liquid outlet channel is arranged adjacent to the exhaust port, and the outer end of the liquid outlet channel extends from the side of the exhaust port to the upper part or the lower part of the exhaust port. The present invention can reduce the warm-up time to improve the warm-up speed.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycles and relates to a warm-up structure of an engine. Background Art

[0002] A motorcycle engine is a machine that ignites the fuel mixture that enters the cylinder and converts the heat energy generated by its combustion into mechanical energy, and the crankshaft transmits the power to the rear wheel of the motorcycle through the transmission mechanism to convert it into the driving power of the vehicle. The engine needs to be warmed up after a cold start. At this time, the coolant circulates in the engine water jacket to quickly raise the coolant temperature to 60 degrees. Warming up is a necessary method to protect the machine. Otherwise, it is very likely to cause accidents such as cylinder bursting, excessive piston wear, and piston rod breakage.

[0003] A Chinese patent with authorization announcement number CN201372858Y discloses a water-cooled engine cylinder head structure, which includes at least a cylinder body, a cylinder head and a gasket. The cylinder body is provided with a cooling water inlet and a cooling water flow channel; a gasket is provided between the cylinder body and the cylinder head, and at least one cooling water passage is provided on the gasket; the cylinder head is provided with a cooling water channel and a cooling water outlet.

[0004] The above structure can improve the anti-knock strength of the cylinder head, but the speed of the coolant heating up when the engine is warmed up is still not fast enough. To solve the above problem, the general technicians in this field can easily consider: 1. reduce the volume of the water jacket or increase the heat absorption area of ​​the water jacket to increase the heating speed of the coolant in the water jacket; 2. set a heating device in the water tank to electrically heat the coolant. Summary of the invention

[0005] The present invention aims at the above-mentioned problems existing in the prior art and provides an engine warm-up structure. The technical problem to be solved by the present invention is: how to increase the warm-up speed of a motorcycle engine.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A warm-up structure for an engine, the engine includes a cylinder head, the cylinder head has a water jacket arranged around a combustion chamber, the outer peripheral surface of the cylinder head has an exhaust port for discharging combustion exhaust gas, the warm-up structure includes a liquid outlet channel whose outer end can be connected to a heat dissipation water tank, the liquid outlet channel is located at the exhaust port on the cylinder head, and is characterized in that the liquid outlet channel and the exhaust port are both located on the same side of the outer periphery of the cylinder head, the inner end of the liquid outlet channel is connected to the water jacket, the liquid outlet channel is adjacent to the exhaust port, and the outer end of the liquid outlet channel extends from the side of the exhaust port to the upper part or the lower part of the exhaust port.

[0008] The engine is provided with a cylinder head, on which intake and exhaust ports are arranged. The intake device is used to mix clean air and fuel and introduce them into the combustion chamber for combustion. The exhaust port discharges the high-temperature exhaust gas after combustion from the combustion chamber. The liquid outlet channel on the cylinder head can return the coolant that has absorbed heat after passing through the cylinder head to the radiator through the liquid outlet channel. During warm-up, the engine runs to drive the water pump to work and drive the coolant to flow in the engine. The coolant circulates in a small loop without passing through the radiator, so that the coolant can fully absorb and retain the heat generated by the engine to achieve rapid temperature rise, and then achieve the warm-up effect and reduce running wear. By arranging the liquid outlet channel on the side where the exhaust port is located, since the exhaust port continuously discharges high-temperature exhaust gas, the cylinder head area around the exhaust port has a very high temperature. In this way, the coolant is on the side with a higher temperature of the cylinder head before flowing out of the engine, reducing heat dissipation and facilitating the coolant flowing back to the water tank to retain more heat. In addition, the liquid outlet channel is arranged adjacent to the exhaust port, and the outer end of the liquid outlet channel extends from the side of the exhaust port to the upper or lower part of the exhaust port. In this way, the distance for heat transfer from the exhaust port to the liquid outlet channel is shorter, the contact surface between the liquid outlet channel and the outer periphery of the exhaust port is larger, and the exchange is more sufficient. The coolant can absorb heat more fully on the outer periphery of the exhaust port, making the temperature of the coolant flowing back higher, thereby reducing the warm-up time to improve the warm-up speed and shortening the inefficient working time of the engine to reduce fuel consumption.

[0009] In the warm-up structure of the above engine, there are several exhaust ports, and the inner end of the liquid outlet channel is arranged between two adjacent exhaust ports. Arranging multiple exhaust ports can ensure high exhaust efficiency and displacement of the engine. By arranging the inner end of the liquid outlet channel between two adjacent exhaust ports, the coolant in the liquid outlet channel is heated by the two exhaust ports on both sides at the same time, further improving the heating efficiency of the coolant flowing back to the water tank and reducing the warm-up time.

[0010] In the warm-up structure of the above engine, the liquid outlet channel includes a connecting section and an extending section arranged in sequence from inside to outside. The connecting section is located between two adjacent exhaust ports and is communicated with the water jacket 1. The extending section is arranged adjacent to the upper or lower part of the exhaust port along the cylinder head surface. By setting the liquid outlet channel to include a connected connecting section and an extending section, the connecting section is located between two adjacent exhaust ports and is communicated with the water jacket 1 in the cylinder head, and the extending section is arranged adjacent to the upper or lower part of the exhaust port along the cylinder head surface. In this way, the coolant in the water jacket 1 can continue to absorb heat and maintain the temperature after flowing into the connecting section. Since the extending section is adjacent to the upper or lower side of the exhaust port along the cylinder head surface, it can continuously obtain the heating and heat preservation effect of the exhaust port during the process of the coolant flowing through the extending section and entering the water tank, reducing the heat loss of the coolant flow during warm-up and improving the warm-up speed.

[0011] In the warm-up structure of the above engine, the combustion chamber is located at the bottom of the cylinder head and is in communication with the exhaust port. The first water jacket includes a surrounding section and a cross section. The surrounding section is arranged along the circumference of the combustion chamber. The cross section is arranged above the combustion chamber and one end thereof is in communication with the surrounding section. The other end of the cross section can be in communication with the connecting section. The surrounding section and the cross section are wound around the outer periphery of the inner end of the exhaust port. The combustion chamber is the working area where fuel and air are mixed and burned. The first water jacket is provided with a surrounding section and a cross section. The surrounding section is arranged along the circumference of the combustion chamber. The cross section is arranged above the combustion chamber and one end thereof is in communication with the surrounding section. The other end of the cross section is in communication with the surrounding section and the connecting section. In this way, the contact area between the coolant and the periphery of the combustion chamber is increased, the heat absorption effect is improved, and the flow rate of the coolant can be increased, so that the circulation speed is increased and the heat transfer efficiency is increased. In addition, the surrounding section and the cross section are wound around the outer periphery of the inner end of the exhaust port, so that the coolant in the first water jacket absorbs the heat in the exhaust port in advance and sufficiently, thereby improving the warm-up speed.

[0012] In the warm-up structure of the above engine, there are two combustion chambers. The first water jacket further includes a confluence section arranged between the two combustion chambers. One end of the confluence section is in communication with the surrounding section, and the other end of the confluence section is in communication with the connecting section located between the two combustion chambers. The other ends of the two cross sections are both in communication with the confluence section. By providing two combustion chambers, the connecting section is located between two adjacent combustion chambers, the confluence section of the first water jacket is arranged between the two combustion chambers, one end of the confluence section is in communication with the surrounding section, the other end of the confluence section is in communication with the connecting section, and the other ends of the two cross sections are both in communication with the confluence section. In this way, the coolant in the first water jacket can fully absorb heat and then flow from the surrounding sections and the cross sections on both sides to the middle confluence section and enter the connecting section, realizing the form of the coolant flowing from the outer sides of the two combustion chambers to the middle, thereby improving the temperature uniformity and warm-up efficiency of the two cylinders.

[0013] In the warm-up structure of the above engine, the engine further includes a cylinder block arranged below the cylinder head. The cylinder block has a second water jacket arranged along the circumference. The second water jacket is in communication with the surrounding section. By arranging the cylinder block below the cylinder head and providing the second water jacket in the cylinder block and communicating it with the surrounding section, the water pump can drive the coolant to first absorb the heat from the periphery of the cylinder barrel in the cylinder block and directly enter the cylinder head, reducing heat loss and ensuring the warm-up efficiency.

[0014] In the warm-up structure of the above engine, the surrounding section is in communication with the second water jacket through a plurality of liquid inlet holes arranged at intervals along the circumference. By providing that the surrounding section is in communication with the second water jacket through a plurality of liquid inlet holes arranged at intervals along the circumference, the cross section of the coolant in the second water jacket entering the surrounding section is increased, and the circulation efficiency is improved.

[0015] In the warm-up structure of the above engine, a gasket is provided between the cylinder block and the cylinder head. The gasket has a number of through holes that are directly aligned and communicated with the liquid inlet holes. The cross-sectional size of the through holes is smaller than that of the corresponding liquid inlet holes, and the cross-sectional size of the through holes far from the connection section is larger than that of the through holes close to the connection section. By providing a gasket between the cylinder block and the cylinder head and arranging a number of through holes on the gasket that are directly aligned and communicated with the liquid inlet holes, making the cross-sectional size of the through holes smaller than that of the corresponding liquid inlet holes, and at the same time making the cross-sectional size of the through holes far from the connection section larger than that of the through holes close to the connection section, the flow rate of the water entering the surrounding section from the second water jacket will be greater in the area far from the connection section, so that the coolant entering the surrounding section forms an effect of squeezing and pushing the whole from the outside to the middle, avoiding poor local coolant flow and non-participation in the cycle, achieving a balanced effect of cycle efficiency and cycle quality, and improving the warm-up speed.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] In the warm-up structure of this engine, by arranging the liquid outlet channel on the side where the exhaust port is located, since the exhaust port continuously discharges high-temperature exhaust gas, the cylinder head area around the exhaust port has a very high temperature. In this way, the coolant is on the side with a higher temperature of the cylinder head before flowing out of the engine, reducing heat dissipation and facilitating the coolant flowing back to the water tank to retain more heat. In addition, the liquid outlet channel is arranged adjacent to the exhaust port, so the distance for heat transfer from the exhaust port to the liquid outlet channel is shorter, making the temperature of the coolant flowing back higher, thereby reducing the warm-up time to improve the warm-up speed and shortening the inefficient working time of the engine to reduce fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the engine in this embodiment.

[0019] Figure 2 is an exploded structural schematic diagram of this embodiment.

[0020] Figure 3 is a sectional structural schematic diagram of the cylinder head in this embodiment.

[0021] Figure 4 is a sectional structural schematic diagram of the cylinder head from another angle in this embodiment.

[0022] Figure 5 is a sectional structural schematic diagram of the cylinder head from the third angle in this embodiment.

[0023] Figure 6 is a three-dimensional structural schematic diagram of the cylinder head in this embodiment.

[0024] Figure 7 is a three-dimensional structural schematic diagram of the cylinder head in this embodiment when it is attached to the gasket.

[0025] In the figure, 1 is the cylinder head; 11 is the combustion chamber; 12 is the liquid inlet hole;

[0026] 2 is the exhaust port;

[0027] 3 is the liquid outlet channel; 31 is the connecting section; 32 is the extending section;

[0028] 4 is the first water jacket; 41 is the surrounding section; 42 is the crossing section; 43 is the confluence section;

[0029] 5 is the cylinder block; 6 is the second water jacket;

[0030] 7 is the gasket; 71 is the through hole. Detailed implementation mode

[0031] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0032] As Figures 1-7 shown, the warm-up structure of this engine includes a cylinder head 1. The cylinder head 1 has a separated exhaust port 2 and a liquid outlet channel 3. The liquid outlet channel 3 and the exhaust port 2 are both arranged on the front side of the cylinder head 1, and the liquid outlet channel 3 and the exhaust port 2 are adjacent to each other. There is a cylinder head 1 on the engine. The cylinder head 1 is provided with intake and exhaust ports 2. The intake device is used to mix clean air and fuel and introduce them into the combustion chamber for combustion. The exhaust port 2 discharges the high-temperature exhaust gas after combustion from the combustion chamber. The liquid outlet channel 3 on the cylinder head 1 can return the coolant that has absorbed heat through the cylinder head 1 to the water tank through the liquid outlet channel 3. During warm-up, the engine operation drives the water pump to work and drives the coolant to flow in the engine. The coolant undergoes a small cycle without passing through the radiator, so that the coolant can fully absorb and retain the heat generated by the engine and achieve rapid temperature rise, thereby achieving the warm-up effect and reducing running wear. By arranging the liquid outlet channel 3 on the side where the exhaust port 2 is located, since the exhaust port 2 continuously discharges high-temperature exhaust gas, the area of the cylinder head 1 around the exhaust port 2 has a very high temperature. In this way, the coolant is on the side with a higher temperature of the cylinder head 1 before flowing out of the engine, reducing heat dissipation and facilitating the coolant returning to the water tank to retain more heat. In addition, the liquid outlet channel 3 and the exhaust port 2 are arranged adjacent to each other, so that the distance for the heat in the exhaust port 2 to transfer to the liquid outlet channel 3 is shorter, making the temperature of the returning coolant higher, thereby reducing the warm-up time to increase the warm-up speed and shortening the inefficient working time of the engine to reduce fuel consumption. Further, there are two exhaust ports 2 on the front side of the cylinder head 1, and the inner end of the liquid outlet channel 3 is arranged between the two exhaust ports 2. Arranging two exhaust ports 2 can ensure high exhaust efficiency and displacement of the engine. By arranging the inner end of the liquid outlet channel 3 between the two exhaust ports 2, the coolant in the liquid outlet channel 3 is heated by the two exhaust ports 2 on both sides at the same time, further improving the heating efficiency of the coolant returning to the water tank and reducing the warm-up time.

[0033] AsFigures 3-5 As shown, the liquid outlet channel 3 includes a connecting section 31 and an extending section 32 arranged in sequence from inside to outside. There is a first water jacket 4 in the cylinder head 1. The connecting section 31 is located between two adjacent exhaust ports 2 and is communicated with the first water jacket 4. The extending section 32 is arranged adjacent to the upper side of the exhaust port 2 along the surface of the cylinder head 1. By setting the liquid outlet channel 3 to include the connected connecting section 31 and extending section 32, the connecting section 31 is located between two adjacent exhaust ports 2 and is communicated with the first water jacket 4 in the cylinder head 1, and the extending section 32 is arranged adjacent to the upper side of the exhaust port 2 along the surface of the cylinder head 1. In this way, the coolant in the first water jacket 4 can continue to absorb heat to ensure the temperature after flowing into the connecting section 31. Since the extending section 32 is adjacent to the upper side of the exhaust port 2 along the surface of the cylinder head 1, the extending section 32 can continuously obtain the heating and heat preservation effect of the exhaust port 2 during the process of the coolant flowing through the extending section 32 and entering the water tank, reducing the heat loss of the coolant flow during warm-up and improving the warm-up speed. The bottom of the cylinder head 1 has a combustion chamber 11 communicated with the exhaust port 2. The first water jacket 4 includes a surrounding section 41 and a cross section 42. The surrounding section 41 is arranged along the circumference of the combustion chamber 11. The cross section 42 is arranged above the combustion chamber 11 and one end is communicated with the surrounding section 41. The other end of the cross section 42 can be communicated with the connecting section 31 through the surrounding section 41. The surrounding section 41 and the cross section 42 are wound around the outer periphery of the inner end of the exhaust port 2. The combustion chamber 11 is the working area where fuel and air are mixed and burned. By setting the first water jacket 4 to include the surrounding section 41 and the cross section 42, the surrounding section 41 is arranged along the circumference of the combustion chamber 11, the cross section 42 is arranged above the combustion chamber 11 and one end is communicated with the surrounding section 41, and the other end of the cross section 42 is communicated with the surrounding section 41 and the connecting section 31. In this way, the contact area between the coolant and the periphery of the combustion chamber 11 is increased, the heat absorption effect is improved, and the flow rate of the coolant can be increased, making the circulation speed faster and increasing the heat transfer efficiency. In addition, the surrounding section 41 and the cross section 42 are wound around the outer periphery of the inner end of the exhaust port 2, so that the coolant in the first water jacket 4 can absorb the heat in the exhaust port 2 in advance and sufficiently, thereby improving the warm-up speed. Preferably, there are two combustion chambers 11. The first water jacket 4 further includes a confluence section 43 arranged between the two combustion chambers 11. One end of the confluence section 43 is communicated with the surrounding section 41, and the other end of the confluence section 43 is communicated with the connecting section 31 located between the two combustion chambers 11. The other ends of the two cross sections 42 are both communicated with the confluence section 43. By setting two combustion chambers 11, the connecting section 31 is located between two adjacent combustion chambers 11, the confluence section 43 of the first water jacket 4 is arranged between the two combustion chambers 11, one end of the confluence section 43 is communicated with the surrounding section 41, the other end of the confluence section 43 is communicated with the connecting section 31, and the other ends of the two cross sections 42 are both communicated with the confluence section 43. In this way, the coolant in the first water jacket 4 can fully absorb heat and flow from the surrounding sections 41 and cross sections 42 on both sides to the middle confluence section 43 and enter the connecting section 31, realizing the form of the coolant flowing from the outside of the two combustion chambers 11 to the middle, thereby improving the temperature uniformity and warm-up efficiency of the two cylinders.

[0034] AsFigures 1-7 As shown, the engine further includes a cylinder block 5 disposed below the cylinder head 1. The cylinder block 5 has a second water jacket 6 arranged circumferentially therein, and the second water jacket 6 communicates with the surrounding section 41. By disposing the cylinder block 5 below the cylinder head 1 and arranging the second water jacket 6 in the cylinder block 5 to communicate with the surrounding section 41, the water pump can drive the coolant to first absorb the heat around the cylinder liner in the cylinder block 5 and directly enter the cylinder head 1, reducing heat dissipation and ensuring the warm-up efficiency. The surrounding section 41 communicates with the second water jacket 6 through a plurality of liquid inlet holes 12 arranged circumferentially and spaced apart on the cylinder head 1. By arranging the surrounding section 41 to communicate with the second water jacket 6 through a plurality of liquid inlet holes 12 arranged circumferentially and spaced apart, the cross-section of the coolant entering the surrounding section 41 from the second water jacket 6 is increased, improving the circulation efficiency. A gasket 7 is provided between the cylinder block 5 and the cylinder head 1. The gasket 7 has a plurality of through holes 71 that are directly opposite and communicate with the liquid inlet holes 12. The cross-sectional dimension of the through holes 71 is smaller than that of the corresponding liquid inlet holes 12, and the cross-sectional dimension of the through holes 71 farther from the connecting section 31 is larger than that of the through holes 71 closer to the connecting section 31. By providing the gasket 7 between the cylinder block 5 and the cylinder head 1 and arranging a plurality of through holes 71 that are directly opposite and communicate with the liquid inlet holes 12 on the gasket 7, making the cross-sectional dimension of the through holes 71 smaller than that of the corresponding liquid inlet holes 12, and at the same time making the cross-sectional dimension of the through holes 71 farther from the connecting section 31 larger than that of the through holes 71 closer to the connecting section 31, the flow rate of the coolant entering the surrounding section 41 from the second water jacket 6 will be larger in the area farther from the connecting section 31, so that the coolant entering the surrounding section 41 forms an effect of squeezing and pushing the whole from the outside to the middle, avoiding poor flow of local coolant and non-participation in the circulation, achieving a balanced effect of circulation efficiency and circulation quality, and improving the warm-up speed.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A warm-up structure for an engine, the engine includes a cylinder head (1), a first water jacket (4) surrounding the combustion chamber (11) is provided in the cylinder head (1), an exhaust port (2) for discharging combustion exhaust gas is provided on the outer peripheral surface of the cylinder head (1), the warm-up structure includes a liquid outlet channel (3) whose outer end can communicate with a radiator, the liquid outlet channel (3) is located on the cylinder head (1), and is characterized in that, The liquid outlet channel (3) and the exhaust port (2) are both located on the same side of the outer periphery of the cylinder head (1). The inner end of the liquid outlet channel (3) communicates with the first water jacket (4). The liquid outlet channel (3) is arranged adjacent to the exhaust port (2), and the outer end of the liquid outlet channel (3) extends from the side of the exhaust port (2) to the upper or lower part of the exhaust port (2). There are several exhaust ports (2). The inner end of the liquid outlet channel (3) is arranged between two adjacent exhaust ports (2). The liquid outlet channel (3) includes a connecting section (31) and an extending section (32) arranged in sequence from inside to outside. The connecting section (31) is located between two adjacent exhaust ports (2) and communicates with the first water jacket (4). The extending section (32) is arranged adjacent to the upper or lower part of the exhaust port (2) along the surface of the cylinder head (1). The combustion chamber (11) is located at the bottom of the cylinder head (1) and communicates with the exhaust port (2). The first water jacket (4) includes a surrounding section (41) and an intersecting section (42). The surrounding section (41) is arranged along the circumference of the combustion chamber (11). The intersecting section (42) is arranged above the combustion chamber (11) and one end thereof communicates with the surrounding section (41). The other end of the intersecting section (42) can communicate with the connecting section (31). The surrounding section (41) and the intersecting section (42) are wound around the outer periphery of the inner end of the exhaust port (2).

2. The warm-up structure of the engine according to claim 1, characterized in that, There are two combustion chambers (11). The first water jacket (4) further includes a confluence section (43) arranged between the two combustion chambers (11). One end of the confluence section (43) communicates with the surrounding section (41), and the other end of the confluence section (43) communicates with the connecting section (31) located between the two combustion chambers (11). The other ends of the two intersecting sections (42) both communicate with the confluence section (43).

3. The warm-up structure of the engine according to claim 1 or 2, characterized in that, The engine further includes a cylinder block (5) arranged below the cylinder head (1). A second water jacket (6) arranged along the circumference is provided in the cylinder block (5). The second water jacket (6) communicates with the surrounding section (41).

4. The warm-up structure of the engine according to claim 3, characterized in that, The surrounding section (41) communicates with the second water jacket (6) through a plurality of liquid inlet holes (12) arranged at intervals along the circumference.

5. The warm-up structure of the engine according to claim 4, characterized in that, A gasket (7) is provided between the cylinder block (5) and the cylinder head (1). A plurality of through holes (71) facing and communicating with the liquid inlet holes (12) are provided on the gasket (7). The cross-sectional dimension of the through holes (71) is smaller than the cross-sectional dimension of the corresponding liquid inlet holes (12). The cross-sectional dimension of the through holes (71) far from the connecting section (31) is larger than the cross-sectional dimension of the through holes (71) close to the connecting section (31).

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