TWI832569B - Air-cooled engine case with oil temperature sensing - Google Patents

Abstract

An air-cooled engine casing with an oil temperature sensing function, which includes a casing body and an oil temperature sensor. The casing body includes a cylinder head, a cylinder block, and a cylinder disposed on the cylinder block away from the cylinder head. The crankcase body on one side is filled with engine oil in the oil chamber of the crankcase body. The oil temperature sensor is installed on the lower side of the crankcase body and is electrically connected to the trip computer system. The oil temperature sensor senses the oil temperature. The oil temperature sensor extends into the engine oil chamber and is completely immersed in the engine oil. The oil temperature sensor can measure the oil temperature of the engine oil and transmit the measured oil temperature value to the driving computer system. The oil temperature sensor is set far away from the cylinder. The position of the head eliminates the possibility of damage to the oil temperature sensor due to temperature rise due to combustion during engine operation.

Description

Air-cooled engine case with oil temperature sensing

The present invention relates to an engine casing of a motor vehicle, and in particular, to an air-cooled engine casing with an oil temperature sensing function.

Naturally air-cooled engines currently used in motor vehicles such as fuel-powered locomotives mainly use the flowing air generated when the motor vehicle is running to cool the engine. The faster the speed of a motor vehicle, the greater the flow rate of air flowing through the empty engine surface, so that the cooling effect of the flowing air on the engine is better.

Among the currently known natural air-cooled engines (hereinafter referred to as air-cooled engines), in order to protect the engine and prevent the air-cooled engine from being damaged due to overheating, most of the known air-cooled engines are equipped with an oil temperature sensor, and the oil temperature sensor is used to measure Measure the oil temperature in the engine and transmit the measured oil temperature data to the driving computer system of the motor vehicle to control the temperature of the engine in order to protect the engine from overheating and prevent the oil temperature in the engine from rising. This causes the oil's lubricity to the engine parts to deteriorate, which is not conducive to the lubrication of the engine parts.

The above-mentioned measurement of engine oil temperature can further protect the engine from overheating for fuel injection (EFI) type motor vehicles, and can also timely correct the injection of the fuel injection system to the engine based on the level of the engine oil temperature. The measurement signal of oil quantity and engine oil temperature is a necessary and important measurement signal for existing injection fuel supply type motor vehicles.

However, in existing air-cooled engines, the oil temperature sensor is usually installed in the engine cylinder head. Since the cylinder head of air-cooled engines has difficulty in dissipating heat, the oil temperature sensor is close to the engine cylinder head and the oil temperature measured by the oil temperature sensor is prone to change. Inaccurate questions. Under certain usage conditions, this may result in a sensation of oil temperature Problems such as damage to the transmitter. For example: when the vehicle is driving slowly or continuously climbing a hill at low speed, due to the slow vehicle speed, the flow rate of air flowing through the engine surface is slow and the cooling effect is poor. When the engine continues to run, the temperature of the engine cylinder head is likely to rise, which may cause oil The temperature sensor is damaged and loses its proper oil temperature sensing function. For fuel injection (EFI) type motor vehicles, not only the engine may overheat, but also due to the lack of measurement data of the engine oil temperature, the fuel injection system cannot correct and control the amount of fuel injected to the engine based on the oil temperature.

Furthermore, if a motor vehicle is considered to be running at idle for a long time, the lack of flowing air to cool the engine will cause the temperature of the engine cylinder head to rise, which may lead to damage to the oil temperature sensor. In order to reduce the temperature of the cylinder head, when designing an air-cooled engine, the area of the cooling fins of the cylinder head must be expanded. This will increase the size of the engine cylinder head and occupy space, which is not conducive to the installation of the engine in the body of a motor vehicle. . Therefore, based on the volume of the original air-cooled engine, without enlarging the heat dissipation blades, how to overcome the problem that the oil temperature sensor is prone to slowing down the flow of air passing through the engine surface, causing the engine to heat up and causing the oil temperature sensor to measure the temperature? Problems such as inaccuracy and overheating damage are an important issue in the current development of air-cooled engines.

The purpose of the present invention is to provide an air-cooled engine casing with an oil temperature sensing function to solve the problems of existing air-cooled engine cylinder heads that are difficult to dissipate heat, causing the oil temperature sensor to measure inaccurate temperatures and be easily damaged by overheating.

In order to achieve the aforementioned objectives, the present invention proposes an air-cooled engine casing with an oil temperature sensing function, which can be electrically connected to a driving computer system of a motor vehicle. The air-cooled engine casing includes: a casing body, which includes a The cylinder head, a cylinder block portion located on one side of the cylinder head, and a crankcase portion located below a side of the cylinder block away from the cylinder head, the crankcase portion The outer surface of the peripheral wall of the body is provided with a plurality of cooling fins. The crankcase body has an oil chamber filled with engine oil; and an oil temperature sensor is installed on one side of the lower section of the crankcase body. And electrically connected to the driving computer system, the oil temperature sensor includes an oil temperature sensing part that can extend into the engine oil chamber. The oil temperature sensing part is completely immersed in the oil in the engine oil chamber and can measure the temperature of the engine oil. oil temperature, and can transmit the measured oil temperature of the engine oil to the driving computer system.

With the aforementioned invention of the air-cooled engine casing, it is utilized that the temperature sensor is arranged on the lower side of the crankcase body with the casing body positioned below, and the temperature sensing part of the temperature sensor directly extends into the engine oil chamber and is completely immersed in it. placed in the engine oil, thereby positioning the temperature sensor away from the cylinder head of the casing body, effectively eliminating the possibility of damage to the oil temperature sensor due to temperature rise due to combustion during engine operation, and also does not require In order to reduce the cylinder head temperature, the cooling fins of the casing are enlarged.

Furthermore, if the oil in the oil chamber evaporates or is lost, the oil temperature sensing part of the oil temperature sensor is not completely immersed in the oil and is exposed outside the oil, so that the oil temperature sensing part cannot accurately measure due to contact with air. The oil temperature of the engine oil causes the trip computer system to judge that the engine oil temperature value is abnormal and illuminate a warning light.

10:Case body

10A: Cylinder head

10B: Cylinder block part

10C: Crankcase body

100:Oil room

101: Engine oil

11: Longitudinal side wall

12:Oil chamber bottom plate

13: Cooling fins

20:Oil temperature sensor

21:Oil temperature sensing department

Figure 1 is a schematic side plan view of a preferred embodiment of the air-cooled engine casing of the present invention.

Figure 2 is a schematic cross-sectional view of the preferred embodiment of the air-cooled engine casing shown in Figure 1.

Figure 3 shows the preferred embodiment of the air-cooled engine casing shown in Figures 1 and 2. When the oil level in the oil chamber is lower than the lower limit of the oil, the oil temperature sensing part of the oil temperature sensor is not completely immersed in the oil. Schematic diagram.

As shown in Figures 1 and 2, they reveal a partial cross-sectional view of a preferred embodiment of the air-cooled engine casing of the present invention. The air-cooled engine casing is used to install a driving mechanism of an engine, and the driving mechanism includes a piston assembly and a crankshaft assembly.

As shown in FIGS. 1 and 2 , the air-cooled engine casing includes a casing body 10 and an oil temperature sensor 20 . The casing body 10 includes a cylinder head 10A, a cylinder block 10B and a crankcase 10C. The cylinder block 10B is located on one side of the cylinder head 10A. The cylinder block 10B It is used to install the piston assembly. The crankcase body portion 10C is located below the cylinder body portion 10B away from the cylinder head 10A, and has an oil chamber 100. The piston assembly can extend into the oil chamber. In 100, the oil chamber 100 is used to install a crankshaft assembly connected to the piston assembly. The outer surface of the peripheral wall of the crankcase body 10C has a plurality of heat dissipation fins.

As shown in Figures 1 and 2, the oil chamber 100 of the casing body 10 is equipped with engine oil 101, and the casing body 10 is equipped with an engine oil 101 that extends into the oil chamber 100 to measure the liquid level of the engine oil 101. The engine oil ruler 101 is a known object. The engine oil ruler 101 has a liquid level indicator section that can extend into the oil chamber 100. The oil level indicator section is provided with an engine oil 101 in sequence from bottom to top. The lower limit and the upper limit of engine oil 101. The middle position between the upper limit of engine oil 101 and the lower limit of engine oil 101 is defined as the middle limit of engine oil 101. The liquid level of engine oil 101 filled in the oil chamber 100 is higher than the lower limit of engine oil 101 and lower than the engine oil 101 lower limit. 101 upper limit.

As shown in Figures 1 and 2, the crankcase body 10C has an oil chamber bottom plate 12 located at the bottom of the oil chamber 100, and a longitudinal side wall 11 located around the oil chamber 100 and connected to the oil chamber bottom plate 12. The plurality of The heat dissipation fins 13 are provided on the outer peripheral surface of the oil chamber bottom plate 12 and the outer peripheral surface of the longitudinal side wall 11 .

As shown in FIGS. 1 and 2 , the oil temperature sensor 20 is installed on the lower side of the crankcase body 10C of the casing body 10 and extends into the oil chamber 100 , thereby enabling the air cooling of the present invention. The engine case has an oil temperature sensing function. The oil temperature sensor 20 can be electrically connected to the engine control unit (ECU) of the instrument control mechanism of the motor vehicle. Preferably, the oil temperature sensor 20 is located remotely The lower section of the crankcase body 10C away from the cylinder head 10A thereby reduces the influence of the temperature of the cylinder head 10A on the oil temperature sensor 20 . The oil temperature sensor 20 includes an oil temperature sensing part 21. The oil temperature sensing part 21 is completely immersed in the engine oil 101 of the engine oil chamber 100 and can measure the temperature of the engine oil 101 and transmit the oil temperature value of the engine oil 101. To the engine control unit (ECU) of the instrument control mechanism, the engine computer system (ECU) is equipped with an oil temperature control program and a safe oil temperature value range is set in the database, so that the engine computer system (ECU) can be set according to the settings. The oil temperature sensor 20 detects the engine oil 101 oil temperature value to determine whether the detected engine oil 101 oil temperature value is within the oil temperature safety value range, and when the engine oil 101 oil temperature value exceeds the oil temperature safety value range, the vehicle is driven The computer system (ECU) can cause the instrument control mechanism to light up the warning light.

In this preferred embodiment, the oil temperature sensor 20 is sealed and transversely installed in the longitudinal side wall 11 of the crankcase body 10C, and the oil temperature sensor 21 extends into the oil chamber through the longitudinal side wall 11 Within 100, preferably, the height position of the oil temperature sensing part 21 is higher than the lower limit of the engine oil 101 and lower than the middle limit of the engine oil 101.

Through the aforementioned invention of an air-cooled engine casing with an oil temperature sensing function, when it is applied to an air-cooled engine of a motor vehicle such as a fuel-powered motorcycle, the flowing air generated when the motor vehicle is running can cool the air-cooled engine casing. Allow the engine to cool down. At the same time, the oil temperature sensor 20 is installed on the crankcase body portion 10C of the air-cooled engine casing away from the cylinder head 10A. The oil temperature sensing portion 21 of the oil temperature sensor 20 extends into the oil chamber 100 to completely Immersed in the engine oil 101, the oil temperature sensor 20 can accurately sense the oil temperature of the engine oil 101, and because the oil temperature sensor 20 is arranged at a position far away from the cylinder head 10A, it can effectively eliminate combustion caused by the engine during operation. In the event that the oil temperature sensor 20 is damaged due to an increase in temperature, there is no need to enlarge the heat dissipation fins 13 of the casing in order to reduce the cylinder temperature.

As shown in FIG. 3 , if the oil 101 in the oil chamber 100 evaporates or is lost, and the liquid level of the oil 101 is lower than the lower limit of the oil 101 , the oil temperature sensing part 21 of the oil temperature sensor 20 is not completely immersed in the oil 101 When the engine oil 101 is exposed, the oil temperature sensing part 21 is exposed to air and cannot accurately measure the oil temperature. The measured oil temperature of engine oil 101 causes the driving computer system (ECU) to determine that the oil temperature value of engine oil 101 is abnormal, causing the instrument control mechanism to light up a warning light.

Furthermore, the oil temperature sensor 20 can accurately sense the oil temperature of the engine oil 101, and can also measure the oil temperature value of the engine oil 101 and transmit it to the driving computer system (ECU) for monitoring by the driving computer system (ECU). Oil temperature changes of engine oil 101. When the engine oil 101 oil temperature exceeds the safe oil temperature range, the driving computer system (ECU) can light up the warning light to remind the user to take immediate action to reduce the damage rate of the engine due to overheating. For fuel injection (EFI) type motor vehicles, the driving computer system (ECU) can correct and control the amount of fuel injection to the engine based on the measured data of the engine oil 101 oil temperature.

10C: Crankcase body

100:Oil room

101: Engine oil

11: Longitudinal side wall

12:Oil chamber bottom plate

13: Cooling fins

20:Oil temperature sensor

21:Oil temperature sensing department

Claims (2)

An air-cooled engine casing with an oil temperature sensing function, which can be electrically connected to a driving computer system of a motor vehicle. The air-cooled engine casing includes: a casing body, which includes a cylinder head, located on the cylinder head A cylinder block part on one side of the cylinder head part, and a crankcase body part located below the side of the cylinder block part away from the cylinder head. The outer surface of the peripheral wall of the crankcase body part has a plurality of heat dissipation fins, and the crankshaft The box body has an oil chamber and a longitudinal side wall located around the oil chamber. The oil chamber is filled with engine oil. The crankcase body is provided with an oil dipstick that can extend into the oil chamber to measure the height of the oil level. The oil dipstick has a liquid level indication section that can extend into the engine oil chamber. The liquid level indication section is set with a lower limit of engine oil and an upper limit of engine oil in sequence from bottom to top. The intermediate position between the upper limit of engine oil and the lower limit of engine oil is defined. is a middle oil limit, and the liquid level of the oil filled in the oil chamber is higher than the lower limit of the engine oil and lower than the upper limit of the engine oil; and an oil temperature sensor, which is installed laterally on the lower section of the crankcase body One side is electrically connected to the trip computer system. The oil temperature sensor includes an oil temperature sensing portion that can extend into the engine oil chamber through the longitudinal side wall. The height of the oil temperature sensing portion of the oil temperature sensor is higher than The lower limit of the engine oil is lower than the middle limit of the engine oil. The oil temperature sensing part is completely immersed in the engine oil of the engine oil chamber and can measure the oil temperature of the engine oil, and can transmit the measured oil temperature of the engine oil to The trip computer system. The air-cooled engine casing with oil temperature sensing function as described in claim 1, wherein the crankcase body has an oil chamber bottom plate located at the bottom of the oil chamber, and the longitudinal side wall is connected to the oil chamber bottom plate, and the plurality of The heat dissipation fins are arranged on the outer peripheral surface of the oil chamber bottom plate and the outer peripheral surface of the longitudinal side wall, and the oil temperature sensor is transversely installed in the longitudinal side wall in a sealed manner.

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