JPS60142007A - Four-cycle gas engine for hot-water supply - Google Patents

Abstract

PURPOSE:To lower the viscosity of an oil and reduce the power loss in a gas engine which utilizes its cooling liquid for heating water by injecting lubricating oil into the inner side of the top of the piston from the crank chamber side for heating the oil. CONSTITUTION:On the top face of a piston 46 of an engine 10 is formed a hemispherically depressed combustion chamber 66, and an oil hole 72 is formed with its opening in the inner side of the top. In a crank shaft 48 is formed an oil hole 74 which leads a lubricating oil injected from an oil pump. On the end face of a large end 52a of a connecting rod 52 is formed an oil injection groove 78 which is opened toward the piston 46. With the crank shaft 48 rotating, the oil is injected toward the piston 46 from the oil injection groove 78, and it hits against the back side of the combustion chamber 66, namely the under surface of the top of the piston 46. The heat inside the combustion chamber 66 is sufficiently transmitted to the piston 46 and the oil is quickly heated. Consequently the viscosity of the oil goes down, and the power loss decreases; thus the thermal efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: 0≧C) The present invention relates to a four-cycle gas engine for hot water supply that uses gaseous fuel and uses engine coolant to heat hot water.

(Prior Art) In this 4Hdi engine, engine heat is used for heating hot water, so the cylinder inner wall temperature tends to become relatively low. Also, since the air-fuel mixture does not contain oil droplets, the piston's IAMY properties are worse than in a typical gasoline engine. Therefore, it is possible to actively spray lubricating oil onto the inner wall of the cylinder.

However, since interlayer oil is also applied to crank bearings, valve mechanisms, etc., in order to prevent the oil film from breaking in these parts and ensure lubricity, it is not appropriate to use oil with a very low viscosity. Not. In this type of device, the heat of the engine coolant is used to heat hot water for hot water supply, so the cylinder wall temperature is low, and lubricating oil with a viscosity suitable for lubricating various parts of the engine such as the crank bearing is supplied to the cylinder wall.
A problem arises in that the oil temperature decreases, the viscosity of the oil increases, engine horsepower loss increases, and thermal efficiency decreases.

(Tsu and Akira's purpose) Thursday, 65 Akira is X' on the first day of the month like this! It is considered as iQ, and the relatively low temperature cylinder wall
t, 71'1', I lubricating oil or newly supplied 171P;'j□ oil is actively heated by the piston to lower the viscosity of the oil that lubricates the piston, reducing horsepower losses and improving thermal efficiency. The purpose is to provide a 4-cycle gas engine for hot water supply that can achieve two functions.

(41 "Methodization of the Invention") In order to achieve this object, the present invention provides a mechanism for forming a combustion chamber in which the piston top 1 and the top 2 are depressed, and the crank chamber side.

Then, add all the oil to the top of the piston and heat the oil (two configurations).

(Example) The present invention will be explained in detail below based on the following.

The 11th stage shows the entire water heater unit which is one embodiment of the present invention.
)1? It is a complete drawing. In this figure, Q is a liquid-cooled 4-cycle gas engine, and 12 is this engine 10.
It is a one-handed punishment machine driven by Air is sucked into the engine 10 via an air cleaner 14 and a mixer 16, and gaseous fuel is used as fuel.For example, city gas is supplied to the mixer 16 via a pressure regulator 18. In this mixer 16, a mixture of gas and air is formed and supplied to the engine 10.

20 is a four-way switching valve, 22 is an expansion valve, 24 is an indoor heat exchanger, and 26 is an outdoor heat exchanger. These and the compressor 12 form a closed loop. 'dJ fluid was played by 4-1 people). Together with the engine 10, a known H-I pump is formed.

This heat pump is constructed as follows. During cooling, the air conditioner valve 20 is in the air conditioner position.

The working ml was compressed and compressed in the compressor 12 and reached a temperature of 36
0 bodies.

After being cooled and liquefied in the outdoor heat exchanger 2G, it becomes low pressure in the expansion valve 22, and is vaporized in the indoor heat exchanger 24 to remove indoor heat.

Then, the cycle of being compressed again by the compression xifIi machine 12 is repeated. Also, during heating, the VJ switching valve 20
Figure 1 is tentative! Located at the ID line position, the high-temperature working fluid 1.j compressed by compression 1 and 12 warms the room in the indoor heat exchanger 24, becomes low pressure by the expansion valve 22, vaporizes and expands by the outdoor heat exchanger 26, and then Heat from the outside air due to stomatal latent heat
'I'll put it in.' This working fluid then returns to the compressor 12 and recirculates the cycle.

In the figure, 28 is a hot water storage tank, in which a heat exchanger 30 is disposed, and the coolant of the engine 10 is circulated through the heat exchanger 30. The water in the Zunawaji hot water storage tank 28 is heated by the waste heat of the engine 10. Therefore, the cooling performance of the engine 10 is sufficient, and the cylinder wall temperature tends to become too low.

32 is a valve for injecting water into this hot water tank 28.

34 is a valve that allows hot water to flow out.

Figure 9'32 shows the engine 10 (1) u, lr surface. In this figure, /IO is a cylinder, and 42 is a cylinder liner.

44 is a cylinder head, and 46 is a piston.

48 is a crankshaft, and a crank pin 50 of this crankshaft 48 and a screw I/I6 are connected by a connecting rod 52. 54 is a spark plug, 56 is an intake/exhaust valve, 58
60 is a rocker arm, 60 is a bushing rod, and 62 is a camshaft.

The camshaft 62 is driven at half the speed of the crankshaft 48;
Push the bushing rod 60 to − through the lifter 64 −
1-, the valve 56 is opened intermittently.

There is a hemispherically depressed combustion chamber (5
6 is formed. Further, a pressure ring aη68 and an oil ring (1'l570) are formed on the outside of the top j11J, and a pressure ring and an oil ring (both not shown) are fitted into these, respectively.

Note that the oil ring shoulder 70 has the top r'< of the piston no.
An oil hole 72 that opens at "I" in 1s is formed.

The old 2nd part of crankshaft 481 is the oil pump (1m not shown)
2.1'I<Oil hole 74
is formed. Also connecting rod large 4'+ :lS
A flat bearing 76 is provided on the sliding surface between 52 a and the crank pin 50.
was caught, and the large M'1iiF'ilS of j atudo 52
",) 2a's D"lh1 surface ('- is formed with an oil spouting groove 78 that extends one mouth in the direction of the piston 46.In addition, the crank pin 50 is provided with an oil spouting groove 78 that supplies oil to the plain bearing 76 and An oil hole 80 is formed to forcefully feed oil ejected from the ejector 78.

As a result, as the crankshaft 48 rotates 11i, oil is spouted from the first oil spouting bamboo 78 toward the piston 46.
This corresponds to the lower surface of the top of the piston/+6 of the combustion chamber 66. Since the combustion chamber 66 is recessed into the piston 46, the heat within the combustion chamber 66 is sufficiently absorbed by the piston 46.
i! (c) The oil is quickly heated λ1. A part of this heated oil enters the oil ring groove 70 from the oil hole 72, and -1116 adheres to the inner surface of the cylinder liner/I2. This oil is heated on the inner surface of the top of the piston 16, so its viscosity becomes low.
Since the piston 46 itself is sufficiently heated from the top 41, the heat is also transmitted to the movement between the piston 46 and the cylinder liner 12, 13.

The oil contained in this sliding part is also heated and the oil viscosity decreases. Therefore, the loss ((5 force becomes smaller.

The direction of ζjiJ4 efficiency can be determined.

, ) 93 is a partial one-view diagram of another embodiment. In this embodiment, the big end of the connecting rod 52A: rB 52 A
；L to J quantity Sho" (one force using the Taira, Ura, Uke 76A, connecting rod 52 A I' from the crankshaft 18 side through the old two-stage oil hole 84
No! on the small end 52 A, L) of A! Uki, this small Vh
：：、lL 52、Ab 4. Pour oil from the oil spout lower 8A installed at the top of the screw I・N 46. I made it erupt during the ls internal song.

This embodiment ensures that the oil is
The oil is heated by 1 inch in 1fJ1 in part i, and the heat is increased by 1 inch.

(Effects of the Invention) As shown in I- below, Ko Jōmei provided a combustion chamber that sinks into the top of the piston (11), and placed a crank on the inner surface of the top of the piston to transmit the combustion light heat to the piston. I injected lubricating oil from the chamber l wound and heated the lubricant f1゛] oil, so I fixed the screws, cylinders, and θ movable parts. ? As the temperature rises, the oil viscosity decreases, and the oil, which has been heated at the top of the piston and has decreased in viscosity, appears on the inner wall of the cylinder.
In this way, the oil on the cylinder wall is heated by the rising force of the piston (2), so the oil in other parts such as the crank bearing is heated.
The ratio of polished ratio 11 anti-r White Li' fortune-telling, the ruler 4"1']f
'+' 4 oil to 1 month] (Even if you stir it, it becomes a function.

[Brief explanation of drawings]

Figure 31 shows the overall configuration of the water heater. No. 21-1 is a sectional view of an engine according to one embodiment of the present invention, and FIG. 3 is a sectional view of a part of the engine showing another embodiment. 10-Engine, 46 piston. 66 Combustion chamber, 78.78A ・Oil spout. 10'ii'i'F Llj I! j mouth small gas cooling α
Technique IlI [Death Association Agent Beng (41st person Yama 1)
Sentence No. 41 - Figure 2 Figure 3

Claims (1)

[Claims] In those that use a gas cooler 1 to heat engine coolant, a combustion chamber is formed that sinks into the top surface of the piston, while lubricating oil is injected from the crank chamber side onto the inner surface of the top of the piston to heat the lubricating oil. A 4-cycle gas engine for hot water heating.