CN217354506U

CN217354506U - Lubricating system of four-stroke engine

Info

Publication number: CN217354506U
Application number: CN202123418056.3U
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 is equipped with the surge chamber in crankcase one side, sets up the one-way check valve that lets in the cam room between surge chamber and cam room, is equipped with the intercommunicating pore of intercommunication surge chamber and crankcase on crankshaft link mechanism. The pressure in the crankcase can be increased by the downward movement of the piston, the lubricating oil-gas mixture is driven to enter the buffer chamber from the crankcase through the communication hole, and enters the cam chamber from the buffer chamber through a single control item of the one-way valve, and the oil-gas mixture is brought to the upper rocker arm chamber by the gear and the lower rocker arm along with the gear operation of the cam chamber, so that the upper rocker arm chamber is lubricated; when the pressure generated by the pressure in the piston ascending crankcase is smaller than a preset critical value, the one-way valve is closed, and the lubricating oil returns to the crankshaft chamber through an oil return hole at the bottom of the cam chamber to form a one-way circulating lubricating system. The utility model discloses a lubricating system can fully carry out controllable abundant lubrication to four-stroke engine, can satisfy multiple occasion and use.

Description

Lubricating system of 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 current four-stroke engine lubrication system in use and have the problem that the structure is complicated, lubricated abundant inadequately, provide a four-stroke engine lubrication system that can effectively solve lubricated problem.

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

As a further improvement, the communication hole comprises a central hole arranged on the crankshaft connecting rod mechanism and a connecting hole arranged on the crankshaft and positioned at the corresponding position of the buffer chamber, and the connecting hole is communicated with the central hole.

As a further improvement, the buffer chamber is provided with a buffer chamber cover.

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 crankcase rises along with the descending of the piston, the oil-gas mixture in the crankcase enters the buffer chamber from the communication hole, when the pressure generated by the pressure is larger than a preset critical value, the one-way valve is opened, the oil-gas mixture enters the cam chamber from the buffer chamber to lubricate the cam chamber, and 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 also 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 crank chamber is reduced, when the pressure generated by the pressure is smaller than a preset critical value, the oil-gas mixture is prevented from returning to the buffer chamber from the cam chamber by the check valve, and the lubricating oil 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 surge chamber on one side of the crankcase, set up the one-way valve that the lubricated oil circuit of control can follow the one-way cam chamber that lets in of surge chamber between surge chamber and cam chamber, be equipped with the intercommunicating pore of intercommunication surge chamber and crankcase on crankshaft link mechanism. When the piston runs, the pressure in the crankcase can be increased by the downward running of the piston, so that lubricating oil-gas mixture is driven to enter the buffer chamber from the crankcase through the communication hole and enter the cam chamber from the buffer chamber through a control single item of the one-way valve, and further, the lubricating oil-gas mixture runs along with the gear of the cam chamber, and 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; when the piston moves upwards, the pressure in the crank case is reduced, when the pressure generated by the pressure is smaller than a preset critical value, the one-way valve is closed, the one-way valve prevents the oil-gas mixture from returning to the buffer chamber from the cam chamber, and the lubricating oil returns to the crank chamber through an oil return hole at the bottom of the cam chamber, so that a complete lubricating oil path is formed, and a one-way circulating lubricating system is formed. The controllable full-lubrication device has the beneficial effect that the controllable full-lubrication device can fully lubricate 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 structural view of the buffer chamber.

Detailed Description

Referring to fig. 1-2, the present embodiment includes a lubrication system for a four-stroke engine, including a piston 2, a cam chamber 3, an upper rocker arm chamber 1, a crankcase 8, and a crankshaft connecting rod mechanism 4 disposed in the crankcase 8, wherein a buffer chamber 6 is disposed on one side of the crankcase 8, a communication hole 5 for communicating the buffer chamber 6 with the crankcase 8 is disposed on the crankshaft connecting rod mechanism 4, a check valve 9 for controlling a lubrication oil path to pass from the buffer chamber 6 to the cam chamber 3 in a one-way manner is disposed between the buffer chamber 6 and the cam chamber 3, and the cam chamber 3 is communicated with the upper rocker arm chamber 1 through a tappet hole.

The communicating hole 5 comprises a central hole arranged on the crankshaft connecting rod mechanism 4 and a connecting hole arranged on the crankshaft and positioned at the corresponding position of the buffer chamber 6, and the connecting hole is communicated with the central hole. The hole of the communication hole 5 positioned at the crankshaft or the crankshaft connecting rod mechanism 4 is arranged as a center hole, so that the oil-gas mixture in the crankcase 8 can uniformly and smoothly enter the buffer chamber 6.

The buffer chamber 6 is a concave cavity arranged on the outer side of the crankcase 8, the crankshaft penetrates through the concave cavity, a buffer chamber cover 7 is arranged on the buffer chamber 6, and the buffer chamber 6 is formed by the buffer chamber cover 7 and the concave cavity.

The bottom of the cam chamber 3 is provided with an oil return hole connected with a crank chamber arranged in a crank case 8.

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 moves downwards, the pressure in the crank case 8 rises along with the downward movement of the piston 2, the oil-gas mixture in the crank case 8 enters the buffer chamber 6 through the communication hole 5, when the pressure generated by the pressure is greater than a preset critical value, namely the preset pressure is 0.10MPa, the one-way valve 9 is opened, and the oil-gas mixture enters the cam chamber 3 from the buffer chamber 6 to lubricate the cam chamber 3. When the gear of the cam chamber 3 is running, the gear and the lower rocker arm bring the oil-gas mixture to the upper rocker arm chamber 1, lubricating the upper rocker arm chamber 1.

When the piston 2 moves downwards to the lowest end and then the piston 2 moves upwards, the pressure in the crank case 8 is reduced, when the pressure generated by the pressure is less than 0.10MPa, the check valve 9 is closed, and the check valve 9 prevents the oil-gas mixture from returning to the buffer chamber 6 from the cam chamber 3. The lubricating oil returns to the crank chamber through an oil return hole at the bottom of the cam chamber 3.

The large lubricating oil mist sinks to the bottom of the cam chamber 3, and due to the pressure change of the crankshaft chamber, the blowing and sucking function is realized, so that the engine oil is atomized again and participates in the lubrication again. Part of the oil is sucked into the crankcase 8 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 structure comprises a piston (2), a cam chamber (3), an upper rocker arm chamber (1), a crankcase (8) and a crankshaft connecting rod mechanism (4) arranged in the crankcase (8), wherein a buffer chamber (6) is arranged on one side of the crankcase (8), a communication hole (5) for communicating the buffer chamber (6) with the crankcase (8) is formed in the crankshaft connecting rod mechanism (4), and a check valve (9) for controlling a lubricating oil passage to be communicated into the cam chamber (3) from the buffer chamber (6) in a one-way mode is arranged between the buffer chamber (6) and the cam chamber (3).

2. A lubrication system for a four-stroke engine as claimed in claim 1, wherein: the communicating hole (5) comprises a central hole arranged on the crankshaft connecting rod mechanism (4) and a connecting hole arranged on the crankshaft and positioned at the corresponding position of the buffer chamber (6), and the connecting hole is communicated with the central hole.

3. The lubrication system for a four-stroke engine as recited in claim 1, wherein: the buffer chamber (6) is provided with a buffer chamber cover (7).

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 connected with a crank chamber arranged in the crank case (8).

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 raising the pressure in the crank case (8) along with the descending of the piston (2) when the piston (2) descends, enabling the oil-gas mixture in the crank case (8) to enter the buffer chamber (6) from the communicating hole (5), opening the one-way valve (9) when the pressure generated by the pressure is larger than a preset critical value, enabling the oil-gas mixture to enter the cam chamber (3) from the buffer chamber (6) to lubricate the cam chamber (3), and enabling the oil-gas mixture to be brought to the upper rocker arm chamber (1) by the gear and the lower rocker arm when the gear of the cam chamber (3) runs to lubricate the upper rocker arm chamber (1).

6. 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 (8), closing the one-way valve (9) when the pressure generated by the pressure is smaller than a preset critical value, preventing the oil-gas mixture from returning to the buffer chamber (6) from the cam chamber (3) through the one-way valve (9), and enabling the lubricating oil to return to the crank chamber through an oil return hole at the bottom of the cam chamber (3).

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

8. 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.