JPH0596447U - Lubricator for 2-cycle engine - Google Patents

Abstract

(57) [Summary] [Purpose] Lubricate the governor of a two-cycle engine satisfactorily without any trouble. [Structure] 2 in which a governor device 9 is housed in a governor chamber 10
In the cycle engine 1, the crank chamber 7 into which the air-fuel mixture is sucked is communicated with the governor chamber 10, and the governor chamber 10 is opened with the discharge port 25 of the lubricating oil pump 24.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a two-cycle engine lubrication device having a governor device.

[0002]

[Prior Art]

 Conventionally, there are two types of lubrication methods for a governor device in a two-cycle engine equipped with a governor device. The first lubrication method is to shut off the crank chamber from the governor chamber and store the lubricating oil in the governor chamber. This is a method of lubricating the governor device with lubricating oil.

In the second lubrication method, the crank chamber and the governor chamber are communicated with each other, the lubricating oil is mixed with the air-fuel mixture (gas mixture of fuel and air) and the mixture is sucked into the crank chamber, and the air-fuel mixture is introduced into the governor chamber. This is a system in which the governor is lubricated by the lubricating oil contained in the air-fuel mixture.

[0004]

[Problems to be solved by the device]

 In a two-cycle engine that employs the first lubrication method, it is necessary to completely shut off the crank chamber and the governor chamber by using a seal member. However, if the seal member deteriorates, the lubricating oil in the governor chamber may become There is a risk that the governor system will be burned out because it will be in a non-lubricated state as it is drawn into the combustion chamber and is consumed along with being supplied to the combustion chamber. For this reason, it is necessary to constantly monitor the oil level of the lubricating oil in the governor chamber, which is troublesome and complicated.

In addition, the lubricating oil stored in the governor chamber needs to be replaced periodically because it deteriorates and loses its lubricating function when used for a long period of time. There is a risk of burning the device.

Further, a seal member for partitioning the governor chamber and the crank chamber, a level gauge for monitoring the liquid level of the lubricating oil, etc. are required, and the number of parts increases and the external dimensions of the two-cycle engine and The weight increases and the manufacturing cost also increases.

On the other hand, in a two-cycle engine that adopts the second lubrication system, the concentration of the lubricating oil mixed in the air-fuel mixture is low, so that lubrication tends to be insufficient. In particular, when the load is small and the fuel consumption is low, the absolute amount of lubricating oil supplied is also small, and there is a risk that the governor device will burn out. It is possible to increase the concentration of the lubricating oil contained in the air-fuel mixture in order to eliminate such problems, but in that case, unburned lubricating oil in the exhaust gas increases and air pollution Cause of.

[0008]

[Means for Solving the Problems]

 According to a first aspect of the present invention, in a two-cycle engine in which a governor device is housed in a governor chamber, a crank chamber into which a mixture is sucked is communicated with the governor chamber, and a discharge port of a lubricating oil pump is provided in the governor chamber. It was opened.

According to a second aspect of the invention, in the first aspect of the invention, the discharge port of the lubricating oil pump is opened in the crank chamber.

[0010]

[Action]

 According to the first aspect of the present invention, the rich lubricating oil is directly supplied to the governor chamber housing the governor device, so that the governor device can be satisfactorily lubricated even when the supply amount of the lubricating oil is reduced. The lubricating oil supplied into the governor chamber is sucked into the crank chamber and mixed with the air-fuel mixture in the crank chamber to lubricate the crank chamber and piston.

According to the second aspect of the present invention, since the lubricating oil is directly supplied not only to the governor chamber but also to the crank chamber, the governor device is satisfactorily lubricated and the crank chamber and piston are further lubricated. Well done.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a vertical sectional front view showing the entire structure of a two-cycle engine 1, and a piston 3 is slidably provided in a cylinder 2. A cylinder head 4 is connected to the upper end side of the cylinder 2 and a crankcase 5 is connected to the lower end side of the cylinder 2, and the air-fuel mixture is sucked into the crankcase 5 and the scavenging passage 6 A crank chamber 7 is formed so as to communicate with the inside of the cylinder 2 via the.

A governor case 8 is connected to the crankcase 5, and a governor chamber 10 for accommodating a governor device 9 is formed in the governor case 8 so that the governor chamber 10 and the crank chamber 7 communicate with each other. It is communicated by the mouth 11. The crankshaft 14 held by the bearings 12 and 13 is mounted so as to pass through the crank chamber 7 and the governor chamber 10, and the crankshaft 14 and the piston 3 connect the connecting rod 15 to each other. Are connected through. The governor device 9 is attached to the outer peripheral portion of the crankshaft 14, and the governor device 9 is rotatably attached to the weight holder 16 fixed to the crankshaft 14 and the weight holder 16 with a pin 17. The flyweight 18 is formed by a flyweight 18, a slider 19 pushed and slid by the flyweight 18, a follower 21 for transmitting the movement of the slider 19 to the governor shaft 20, and the like.

Next, an oil tank 22 for storing lubricating oil is provided, and a lubricating oil pump 24 driven by the two-cycle engine 1 is connected to the oil tank 22 via a suction pipe 23. .. The discharge port 25 opened to the governor chamber 10 and the lubricating oil pump 24 are connected via a discharge pipe 26. Further, a branch discharge pipe 27 is branched from the middle of the discharge pipe 26, and a tip end portion of the branch discharge pipe 27 is connected to a discharge port 28 opened in the crank chamber 7.

In such a configuration, when the two-cycle engine 1 is operating, the air-fuel mixture is sucked into the crank chamber 7, the air-fuel mixture is compressed by the descending piston 3, and the scavenging passage 6 communicates with the cylinder 2. It is jetted into the cylinder 2 at the timing.

On the other hand, the lubricating oil pump 24 is driven by the two-cycle engine 1, and the lubricating oil in the oil tank 22 is supplied from the discharge port 25 into the governor chamber 10 via the suction pipe 23 and the discharge pipe 26. .. The lubricating oil supplied into the governor chamber 10 first lubricates the governor device 9, and then is sucked into the crank chamber 7 through the communication port 11 and lubricates the bearing 12 in the suction process. Then, the lubricating oil sucked into the crank chamber 7 is mixed with the air-fuel mixture sucked into the crank chamber 7, and the bearing 13, the bearing 29 provided at the connecting portion between the crank shaft 14 and the connecting rod 15, The bearing 30, which is provided in the connecting portion between the connecting rod 15 and the piston 3, the sliding contact surface between the piston 3 and the cylinder 2, and the like are lubricated, and are further supplied and consumed in the cylinder 2 together with the air-fuel mixture.

Since rich lubricating oil is directly supplied to the governor chamber 10, the governor device 9 can be satisfactorily lubricated even if the amount of lubricating oil supplied is reduced. In addition, since the lubricating oil that has lubricated the governor device 9 flows into the crank chamber 7 and is mixed with the air-fuel mixture, the bearings 12, 13, 29 inside the crank chamber 7 are mixed by the lubricating oil mixed with the air-fuel mixture. , 30 and the sliding contact surface between the piston 3 and the cylinder 2 can be lubricated.

Therefore, in the lubricating device according to the present invention, it is not necessary to provide a lubricating oil reservoir in the governor chamber 10 as compared with the first lubrication method described in the conventional example, and further, the governor chamber 10 and the crank chamber are not required. It is not necessary to provide a partition wall, a seal member, and a level gauge for monitoring the amount of lubricating oil in the governor chamber 10. Therefore, it is possible to reduce the weight and size of the two-cycle engine 1 and reduce the number of parts, and it is not necessary to monitor and replace the remaining amount of lubricating oil, which facilitates handling and inspection.

Next, part of the lubricating oil supplied by the lubricating oil pump 24 is supplied from the discharge port 28 into the crank chamber 7 via the branch discharge pipe 27. Therefore, the bearings 13 and 29 in the crank chamber 7, the piston 3 and the like can be lubricated more satisfactorily.

In this embodiment, the discharge port 28 is provided so as to open to the crank chamber 7. However, if the discharge port is opened inside the engine, the discharge port may be opened to the intake passage, the crankshaft wall or the cylinder wall. It has the same effect.

[0021]

[Effect of the device]

 According to a first aspect of the present invention, in a two-cycle engine in which a governor device is housed in a governor chamber, a crank chamber into which a mixture is sucked is communicated with the governor chamber, and a discharge port of a lubricating oil pump is provided in the governor chamber. Since it is opened, rich lubricating oil can be directly supplied to the governor chamber, so that even if the amount of lubricating oil supplied is reduced, the governor device can be satisfactorily lubricated and due to insufficient lubrication. The occurrence of burnout accident of the governor device can be prevented, and the lubricating oil supplied into the governor chamber is sucked into the crank chamber and also mixed into the crank chamber. Lubricating oil can effectively lubricate the crank chamber and pistons.

According to a second aspect of the invention, in the first aspect of the invention, since the discharge port of the lubricating oil pump is opened in the crank chamber, the lubricating oil is directly supplied not only to the governor chamber but also to the crank chamber. Therefore, the governor device can be satisfactorily lubricated, and the crank chamber and the piston can be satisfactorily lubricated.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

[Explanation of symbols]

 1 2 cycle engine 7 crank chamber 9 governor device 10 governor chamber 24 lubricating oil pump 25 discharge port 28 discharge port

Claims (2)

[Scope of utility model registration request] 1. In a two-cycle engine having a governor device containing a governor device, a crank chamber into which a mixture is sucked is communicated with the governor chamber, and a discharge port of a lubricating oil pump is opened in the governor chamber. Lubricating device for a two-cycle engine characterized by. 2. The lubrication device for a two-cycle engine according to claim 1, wherein a discharge port of the lubricating oil pump is opened in the crank chamber.