JPH07107363B2 - Lubricator for 2-cycle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention utilizes a lubricating oil in an air-fuel mixture for lubricating a rotating part in a two-cycle engine of a type in which a lubricating oil is mixed with a fuel and supplied. For equipment.

(Prior Art) A means for collecting lubricating oil in a mixture supplied to a two-cycle engine and supplying it to bearings, cylinders, etc. has been known (Japanese Patent Laid-Open No. 52-40240). In this conventional technology, the lubricating oil that adheres to the intake passage upstream of the reed valve is collected and guided to each position to be lubricated by an independent oil supply pipe, and a check valve is provided at the outlet of each oil supply pipe, The lubricating oil is sucked when the pressure at the position decreases due to the movement of the.

(Problems to be Solved by the Invention) In the prior art of the first half, since an equal number of lubrication points and check valves are required, the number of parts is large and the structure is complicated, and the check valve mounting position is also large. Is outside the crank bearing, the cylinder wall, etc., and the piping is exposed to the outside, which is an obstacle and is difficult to design.

An object of the present invention is to obtain a lubricating device that does not have the inconveniences of the above-mentioned conventional techniques.

(Means for Solving the Problem) The means for solving the problem in the present invention is a two-cycle engine that supplies a mixture of atomized fuel containing lubricating oil into a crankcase through an intake valve. An auxiliary reed valve that opens outward is provided on a side wall of a valve case of the valve, and an outlet of the auxiliary reed valve is connected to an extraction passage that is connected to a bearing of a crankshaft.

(Operation) During operation of the engine, part of the air-fuel mixture and the lubricant collected on the intake passage and intake valve flows through the auxiliary reed valve to the bleed passage as the internal pressure of the crankcase fluctuates. A backflow is blocked by the sub-reed valve and flows into each bearing to attach the lubricating oil.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. First
In FIG. 2 and FIG. 2, E is a V-type 2-cylinder 2-cycle engine, the cylinder block 1 is provided with a scavenging port 1a and an exhaust port 1b, and the crankcase 2 is composed of an upper crankcase 3 and a lower crankcase 4. A crankshaft 8 is supported by three bearings 5, 6 and 7 held by cases 3 and 4, and a piston 9 is connected to a crankpin thereof by a connecting rod 10.

A suction valve accommodating portion 11 is provided on one side of the upper crankcase 3, a suction valve 12 is inserted into the accommodating portion 11, and a heat insulating pipe 13 is provided.
The vaporizer 14 is connected via. The suction valve 12 is the third
A roof type valve case 15 shown in the figure is used as a base, and a guide wall 16 for forming a smooth flow path is lined inside the base. The valve case 15 has a main reed valve 17 for sending a mixture to the cylinder and a sub reed valve 18 for extracting a mixture for lubrication.
Is provided.

The main reed valve 17 has an opening 20 provided on both slopes 19 of the valve case 15.
And a main lead 21 that opens and closes this from the outside, and the main lead 21
The secondary reed valve 18
Is composed of an opening 24 provided on one side surface 23 of the valve case 15, an auxiliary lead 25 for opening and closing the opening from outside, and a stopper 26 for restricting the retreat of the auxiliary lead 25. Both reed valves 17 and 18 are check valves. Acts as. A seal 27 is adhered around the auxiliary reed valve 18 in close contact with the inner surface of the intake valve housing 11.

In order to supply the lubricating oil collected in the valve case 15 to the lubrication part together with the air-fuel mixture that splits through the auxiliary reed valve 18, bleed holes 30 and 31 are formed in the upper crankcase 3, and the seal 2
7 surrounds the inlet of the extraction hole 30 and is in close contact with the inner surface of the housing portion 11 to form an airtight flow path. The bleed hole 31 following this is communicated with the bleed groove 32 formed on the split surfaces of the upper and lower crankcases 3 and 4 for holding the bearings 5 to 7, and the bleed hole 31 has two holes as shown in FIG. And the bleed groove 32 is a wall 32.
Suspended at a, left and right are provided independently. However, the extraction groove 32 may be continuous and the extraction hole 31
Only books are acceptable. One of the bleed grooves 32 communicates with the bearing 5 and the seal 33 on the outside thereof and between the bearing 6 and the seal 34 at the center, and the other communicates with the bearing 7 and the seal 35 on the outside thereof. There is.

The crankshaft 8 has two crankpins 37 and 38, to which the large end 39 of the connecting rod 10 is fitted via a needle bearing 40 (FIG. 1). In order to lubricate the needle bearing 40, two sets of oil passages 41 to 44 are bored in the crankshaft 8,
One of the first oil passages 41 is in communication between the bearing 5 and the seal 33, the other oil passage 41 is in communication between the bearing 7 and the seal 35, and the last oil passage 44 is in the needle bearing 40, respectively. It is open. Therefore, each needle bearing 40 communicates with the extraction groove 32 and the extraction passage 31.

As described above, when the engine E operates, the pressure in the crankcase 2 fluctuates positively and negatively, the main reed valve 17 opens and closes due to the front and rear pressure difference, and the air-fuel mixture sucked from the main reed valve 17 is pumped to the scavenging port 1a. To do. Since the pressure in the crankcase 2 also acts on the oil passage 44 at the same time, the auxiliary reed valve 18 also opens and closes due to the pressure difference, and a part of the air-fuel mixture and the lubricating oil collected in the intake passage and the valve case 15 are collected. Is sucked into the extraction hole 31 and flows into the extraction groove 32 to lubricate the bearings 5 to 7. Further, the air-fuel mixture and the lubricating oil in the oil passages 42 to 44 flow into the needle bearing 40 by the centrifugal force generated by the pressure difference and the rotation of the crankshaft 8 and the crankpin.
Lubricate 37, 38 and the large end 39 of the connecting rod 10. Therefore, it is possible to automatically lubricate each bearing portion that is not opened toward the inside of the crankcase.

(Effects of the Invention) As described above, the present invention provides the auxiliary reed valve for bleeding by utilizing the valve case of the intake valve, and the bleeding hole and the bleeding groove in the crankcase, and the oil passage in the crankshaft. Since it is communicated with the bearing, the auxiliary reed valve has a simple structure and is not exposed to the outside, and the passage downstream of the auxiliary reed valve is formed in the crankcase without piping. Therefore, the engine has a simple structure and is compact. Has the effect that can be configured.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an engine embodying the present invention, and FIG.
The figure is a vertical side view, and FIGS. 3 (a) and 3 (b) are a plan view and a side view of an intake valve. 5,6,7 …… Bearing 8 …… Crankshaft 12 …… Suction valve 15 …… Valve case 17 …… Main reed valve 18 …… Sub reed valve 23 …… Side wall 30,31 …… Bleed hole 32 …… Bleed air Groove 40 …… Needle bearing 41,42,43,44 …… Oil passage

Claims (1)

[Claims] 1. In a two-cycle engine for supplying a mixture of atomized fuel containing lubricating oil into a crankcase through an intake valve, an auxiliary reed valve that opens outward on a sidewall of a valve case of the intake valve. And an outlet of the auxiliary reed valve is communicated with an extraction passage communicating with a bearing of a crankshaft.