JPH04113711U - 2 cycle engine - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] Opening and closing the exhaust valve 21 by the valve mechanism 20 2
To lubricate a valve operating mechanism 20 of an exhaust valve 21 with a simple structure in a cycle engine. [Structure] An intake port 11 and a scavenging port 12 are open on the side surface of the cylinder 10, and an exhaust port 14 is open at the top of the combustion chamber 13. This exhaust port 14 is the exhaust passage 15
It communicates with the atmosphere through the exhaust valve 21 and is opened and closed by the exhaust valve 21. Of the valve operating mechanism 20, the push rod 24, rocker arm 25, valve stem 21a, and valve spring 27 are provided within the intake passage 30. This intake passage 30 communicates with the intake device 19, and introduces a new air-fuel mixture M containing oil into the crank chamber 17 through the intake port 11. Hit 20.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to a two-stroke engine that uses a valve mechanism to open and close the exhaust valve. In particular, the present invention relates to a lubricating device for a valve train.

0002

[Conventional technology]

Conventionally, an exhaust port is opened in the combustion chamber, and this exhaust port is opened and closed. A uniflow type two-stroke engine is known that is equipped with an exhaust valve that , see Japanese Patent Application Laid-Open No. 56-81223).

0003 This type of two-stroke engine has a scavenging port at the bottom of the cylinder and a combustion chamber on the opposite side. Since the exhaust port is open at the top of the cylinder, the exhaust port is opened at the top of the cylinder. Compared to general 2-stroke engines, exhaust gas is less likely to remain in the upper part of the combustion chamber, making it easier to eliminate exhaust gas. The exit will be smoother. Therefore, scavenging efficiency is improved, resulting in improved output, fuel efficiency, and cleaner exhaust. It has the advantage of improving. Also, it is necessary to provide a dedicated exhaust valve different from the piston. With this, you can arbitrarily select the opening and closing timing of the exhaust port, making it more powerful than a normal 2-stroke engine. also increases the effective work of the piston by delaying the exhaust timing. be able to.

0004

[Problem that the idea aims to solve]

However, since an exhaust valve is provided, a valve mechanism is required to drive this exhaust valve. Therefore, it is necessary to lubricate this valve mechanism. Therefore, in addition to the oil pump, An oil filter, oil pan, oil cooler, etc. are required. Therefore, the book Therefore, the advantage of the two-stroke engine, which is a simple structure, is lost. In addition, the valve mechanism Maintenance and inspection of the lubricating device is also required, which is troublesome.

[0005] This idea was made in view of the above-mentioned conventional problems, and is a two-cycle engine equipped with an exhaust valve. The purpose is to lubricate the valve mechanism of the exhaust valve with a simple structure in the engine. Ru.

[0006]

[Means to solve the problem]

In order to achieve the above purpose, this invention introduces a new air-fuel mixture into the crank chamber. An intake passage is provided that corresponds to the valve operating mechanism of the exhaust valve.

[0007]

[Effect]

In a 2-stroke engine, the new mixture contains oil, so this oil By providing an intake passage that exposes the new air-fuel mixture containing When the oil mist contained in It is possible to lubricate the contact parts.

[0008]

【Example】

An embodiment of this invention will be described below with reference to FIG. In Figure 1, there is an intake port 11 on the side of a cylinder 10 of a two-stroke engine. The scavenging port 12 is open. An exhaust port 14 is opened at the top of the combustion chamber 13. Ru. This exhaust port 14 communicates with the atmosphere via an exhaust passage 15, and also It is opened and closed by a gas valve 21. The above exhaust valve 21 is connected to the crankshaft, as explained below. It is driven to open and close by a valve operating mechanism 20 that is linked to the valve mechanism 16.

[0009] A cam 22 is integrally formed on the crankshaft 16, and the rotation of this cam 22 causes the taper to rotate. The cut 23 moves up and down. This tappet 23 moves the push rod 24 by its vertical movement. The rocker arm 25 is swung through the rocker arm 25. This rocker arm 25 is the valve stem 21 of the exhaust valve 21. Open the exhaust valve 21 by pressing down on the upper end of a. The above valve stem 21a is the valve guide 26 The valve spring 27 closes the exhaust port 14. is biased in the direction of

0010 Of the valve mechanism 20, the push rod 24, rocker arm 25, valve stem 21a and valve Lube spring 27 is provided within intake passage 30. This intake passage 30 It communicates with an intake device 19 consisting of a bullet, an air cleaner, an intake pipe, etc. A new mixture M containing oil is introduced into the crank chamber 17 through the intake port 11. Then, apply this new air-fuel mixture M to the valve mechanism 20. The intake passage 30 above is the cylinder head 10A, the first intake passage 31 including the rocker arm chamber 18 formed in the upper part of the cylinder 10 and a second intake passage 32 formed in the cylinder head 10A. The second above The push rod 24 passes through the intake passage 32. In addition, the above new mixture M In the case of separate oil supply, oil is mixed by injection; In the case of synthetic oil, it is contained in the fuel itself. In addition, 40 is a water jacket, 41 is a spark plug, and 42 is a bearing.

[0011] Next, the flow of the new air-fuel mixture M will be briefly explained. The new air-fuel mixture M passes through the intake passage 30 due to the rise of the piston 43, and once enters the cylinder. Inhaled within 10 minutes. The new air-fuel mixture M is sucked into the scavenging air by the lowering of the piston 43. The scavenging air is introduced above the piston 43 from the scavenging port 12 via the passage 12A.

0012 In the above configuration, the oil mist in the new mixture M is arranged in the intake passage 30. The contact portion 20a of each component of the valve mechanism 20 comes into contact with the contact portion 20a, and also enters the sliding contact portion 20b. Besides that The contact part 20a and sliding contact part 20b of the valve mechanism 20 are affected by the oil in the new mixture M. Lubricated. Therefore, multiple components such as oil pump, oil filter, oil pan, etc. Since no complicated equipment is required, lubrication can be achieved with a simple structure. Also, this suction The lubricating device consisting of the air passage 30 does not have a driving part such as an oil pump, so Its maintenance and inspection become easier.

[0013] By the way, in the above embodiment, one intake passage 30 is provided to transfer the new air-fuel mixture M to the valve train 20. However, if the valve train 20 can be lubricated, the valve train 20 can be lubricated. In addition to the sliding intake passage 30, an intake passage that does not lubricate the valve mechanism 20 may be provided. Ma In addition, it is not necessary to directly apply the new air-fuel mixture M to all of the valve mechanism 20 to lubricate it; for example, The new air-fuel mixture M may directly impinge only on the parts within the rocker arm chamber 18.

[0014]

[Effect of the idea]

As explained above, according to this invention, a two-stroke engine equipped with an exhaust valve In this system, we have created an intake passage that directs the new air-fuel mixture to the valve mechanism, allowing operation with a simple structure. The valve mechanism can be lubricated. It also has a driving part such as an oil pump. Maintenance and inspection become easier.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a two-stroke engine showing an embodiment of this invention.

[Explanation of symbols]

13...Combustion chamber, 14...Exhaust port, 17...Crank chamber, 20...Valve mechanism, 21...Exhaust valve, 30...Intake passage, M...New mixture.

Claims (1)

[Scope of utility model registration request] Claim 1: In a two-stroke engine that has an exhaust port opened in a combustion chamber and is provided with an exhaust valve that opens and closes the exhaust port, a new air-fuel mixture introduced into the crank chamber is applied to the valve operating mechanism of the exhaust valve. A two-stroke engine characterized by a passageway.