CN217354507U

CN217354507U - Lubrication system for four-stroke engine

Info

Publication number: CN217354507U
Application number: CN202123424290.7U
Authority: CN
Inventors: 胡全宇
Original assignee: Yongkang Puyuan Tools Co ltd
Current assignee: Yongkang Puyuan Tools Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-09-02
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a four-stroke engine's lubricating system, including setting up piston, cam chamber in the engine, going up rocking arm room, crankcase, setting up bent axle link mechanism and the bent axle room in the crankcase. The pressure in the crankcase can be increased by the downward movement of the piston, when the pressure reaches a preset pressure, the one-way valve is opened, and the pressure in the crankshaft chamber drives the lubricating oil-gas mixture to enter the cam chamber from the crankshaft chamber through the one-way valve so as to lubricate the cam. When the piston moves upwards after moving downwards to the lowest end, the pressure in the crank shaft case is reduced, when the pressure generated by the pressure is smaller than a preset critical value, the one-way valve is closed, and the oil-gas mixture returns to the crank shaft case through an oil return hole at the bottom of the cam chamber. A one-way circulation lubricating system is formed. The utility model discloses a lubricating system can fully carry out controllable abundant lubrication to four-stroke engine. The engine can be turned over at 360 degrees, and the use in various occasions is met.

Description

Lubrication system for four-stroke engine

Technical Field

The utility model relates to a four-stroke engine lubrication's system, concretely relates to lubricating system's circulation mode.

Background

Currently, as the hand-held engine, a four-stroke engine is preferably used from the viewpoint of exhaust emission control; however, four-stroke engines must use separate lubricating oil. When the hand-held tool is used, the engine can work at different angles in order to adapt to the corresponding working environment and occasion. In the working process of the engine, the engine needs to be well lubricated at any angle, and the balance pipe cannot spray excessive engine oil.

In the research and practice process of the method, the existing small-sized four-stroke engine has the problems of insufficient lubrication, short engine durability time, cylinder piston locking, large oil injection amount of a balance pipe and the like. Prior patent CN102230406A discloses a so-called "hand-held four-stroke engine lubrication system", in which there are provided: a crankcase chamber, a valve distribution chamber, and a rotary valve. However, the valve rocker-arm chamber lubrication of this configuration remains inadequate and the engine cannot be turned 360 degrees.

Disclosure of Invention

The utility model discloses a solve present four-stroke engine lubricating system in use and have the structure complicacy, lubricated abundant problem inadequately, provide a four-stroke engine lubricating system that can effectively solve lubricated problem.

The utility model provides a current technical scheme who has the problem be: a lubricating system of a four-stroke engine comprises a piston arranged in the engine, a cam chamber, an upper rocker arm chamber, a crankcase, a crankshaft connecting rod mechanism arranged in the crankcase and a crankshaft chamber, wherein a one-way valve for controlling a lubricating oil path to be led into the cam chamber from the crankcase in a one-way mode is arranged between the crankcase and the cam chamber.

As a further improvement, the check valve is arranged in the check valve seat.

As a further improvement, the cam chamber and the upper rocker arm chamber communicate through a tappet bore.

As a further improvement, the bottom of the cam chamber is provided with an oil return hole connected with a crank chamber arranged in a crank case.

As a further improvement, the lubricating oil circuit comprises that when the piston descends, the pressure in the crank chamber rises along with the descending of the piston, when the pressure generated by the pressure is greater than a preset critical value, the one-way valve is opened, and the oil-gas mixture in the crank chamber enters the cam chamber through the one-way valve to lubricate the cam chamber.

As a further improvement, the lubricating oil circuit also comprises a lubricating oil circuit, when the gear of the cam chamber runs, the gear and the lower rocker arm bring the oil-gas mixture to the upper rocker arm chamber to lubricate the upper rocker arm chamber.

As a further improvement, the lubricating oil circuit further comprises a check valve which is closed when the piston moves upwards after the piston moves downwards to the lowest end and the pressure in the crankcase is reduced, and when the pressure generated by the pressure is smaller than a preset critical value, the oil-gas mixture returns to the crank chamber through an oil return hole at the bottom of the cam chamber.

As a further improvement, the preset critical value is 0.10 MPa.

Compared with the prior art, the utility model, be equipped with the one-way valve that the lubricated oil circuit of control lets in the cam chamber from the crankcase one-way between crankcase and the cam chamber. When the piston runs, the pressure in the crank case can be increased through the downward running of the piston, when the pressure reaches a preset pressure, the one-way valve is opened, and the pressure in the crank chamber drives the lubricating oil-gas mixture to enter the cam chamber from the crank chamber through the one-way valve so as to lubricate the cam. When the piston moves upwards after moving downwards to the lowest end, the pressure in the crank shaft case is reduced, when the pressure generated by the pressure is smaller than a preset critical value, the one-way valve is closed, and the oil-gas mixture returns to the crank shaft case through an oil return hole at the bottom of the cam chamber. Thus forming a complete lubricating oil path and forming a one-way circulating lubricating system. The controllable full-lubrication four-stroke engine has the beneficial effect that the controllable full-lubrication can be fully carried out on the four-stroke engine. The utility model discloses a lubricating system can, the lubrication and the lubricating oil circulation problem of having solved the engine make the engine can 360 degrees overturn at will, satisfy multiple occasion and use.

Drawings

Fig. 1 is a schematic structural sectional view of the present invention.

Fig. 2 is a schematic view of the check valve installation.

Detailed Description

Referring to fig. 1-2, the present embodiment includes a lubrication system for a four-stroke engine, which includes a piston 2 disposed in the engine, a cam chamber 3, an upper rocker arm chamber 1, a crankcase 5, a crankshaft connecting rod mechanism 4 disposed in the crankcase 5, and a crankshaft chamber 6, wherein a check valve 8 for controlling a lubrication oil passage from the crankcase 5 to the cam chamber 3 in a one-way manner is disposed between the crankcase 5 and the cam chamber 3.

The check valve 8 is arranged in the check valve seat 7.

The cam chamber 3 and the upper rocker arm chamber 1 communicate through a tappet hole.

The bottom of the cam chamber 3 is provided with an oil return hole which is connected with a crank chamber 6 arranged in a crank case 5.

The working principle of the lubricating system of the utility model is as follows,

when the engine works, the piston 2 starts to move, when the piston 2 descends, the pressure in the crank case 5 rises along with the descending of the piston 2, when the pressure generated by the pressure is greater than a preset critical value, the one-way valve 8 is opened, and the oil-gas mixture in the crank chamber 6 enters the cam chamber 3 through the one-way valve 8 to lubricate the cam chamber 3. When the gears of the cam chamber 3 are running, the gears and the lower rocker arm bring the oil-gas mixture to the upper rocker-arm chamber 1, which brings lubrication to the upper rocker-arm chamber 1.

When the piston 2 moves upwards after moving downwards to the lowest end, the pressure in the crank chamber 5 is reduced, and when the pressure generated by the pressure is smaller than a preset critical value, the one-way valve 8 is closed, and the oil-gas mixture returns to the crank chamber 6 through an oil return hole at the bottom of the cam chamber 3.

The preset critical value is 0.10 Mpa.

The large lubricating oil mist sinks to the bottom of the cam chamber 3, and due to the pressure change of the crankshaft chamber 6, the blowing and sucking functions are realized, so that the engine oil is atomized again and participates in the lubrication again. Part of the engine oil is sucked into the crankcase 5 and then enters the oil storage chamber to complete the circulation.

Claims

1. A lubrication system for a four-stroke engine, characterized by: the lubricating oil passage control device comprises a piston (2) arranged in an engine, a cam chamber (3), an upper rocker arm chamber (1), a crankcase (5), a crankshaft connecting rod mechanism (4) arranged in the crankcase (5) and a crankshaft chamber (6), wherein a one-way valve (8) for controlling a lubricating oil passage to pass from the crankcase (5) to the cam chamber (3) in a one-way mode is arranged between the crankcase (5) and the cam chamber (3).

2. The lubrication system for a four-stroke engine as recited in claim 1, wherein: the check valve (8) is arranged in the check valve seat (7).

3. The lubrication system for a four-stroke engine as recited in claim 1, wherein: the cam chamber (3) is communicated with the upper rocker arm chamber (1) through a tappet hole.

4. The lubrication system for a four-stroke engine as recited in claim 1, wherein: the bottom of the cam chamber (3) is provided with an oil return hole which is connected with a crank chamber (6) arranged in the crank case (5).

5. The lubrication system for a four-stroke engine as recited in claim 1, wherein: the lubricating oil path comprises a lubricating oil path which is used for lubricating the cam chamber (3) by opening the check valve (8) when the piston (2) moves downwards and the pressure in the crank chamber (5) rises along with the downward movement of the piston (2) and by enabling the oil-gas mixture in the crank chamber (6) to enter the cam chamber (3) through the check valve (8) when the pressure generated by the pressure is larger than a preset critical value.

6. The lubrication system for a four-stroke engine as recited in claim 5, wherein: the lubricating oil circuit also comprises a lubricating oil circuit which brings oil-gas mixture to the upper rocker arm chamber (1) by the gear and the lower rocker arm when the gear of the cam chamber (3) runs and brings lubrication to the upper rocker arm chamber (1).

7. The lubrication system for a four-stroke engine as recited in claim 1 or 5, wherein: the lubricating oil path also comprises a lubricating oil path which is used for enabling the piston (2) to move upwards after the piston (2) moves downwards to the lowest end, reducing the pressure in the crank case (5), closing the one-way valve (8) when the pressure generated by the pressure is smaller than a preset critical value, and enabling the oil-gas mixture to return to the crank chamber (6) through an oil return hole at the bottom of the cam chamber (3).

8. The lubrication system for a four-stroke engine as recited in claim 5 or 6, wherein: the preset critical value is 0.10 Mpa.