JPS62228611A - Automatic air bleeder of oil pump for internal combustion engine - Google Patents

Abstract

PURPOSE:To make speedy air bleed possible to be done as well as to prevent air from flowing backward, by interconnecting an upper opening of an auxiliary chamber to a vacuum generating part of an engine and a lower opening to an air vent of an oil pump, respectively, and installing a float body provided with a valve member opening or closing the upper opening inside. CONSTITUTION:Oil out of a suction pipe 31 is fed to each cylinder from discharging nozzles 63, 65 and 71 through an oil pump 29 to be driven by a crankshaft of an engine via a worm 55 and a worm wheel member 57. In an upper part of the oil pump 29, there is provided with an air vent 53 which is interconnected to the lower opening 93 installed in the bottom of an auxiliary chamber 39 via an air vent pipe 37. A float body 99 is installed in the inner part of the auxiliary chamber 39, and an upper opening 95 to be opened or closed by the valve member 105 attached to this float body 99 is interconnected to a vacuum generating part of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air venting device for an oil pump used in an internal combustion engine of a separate oil supply system.

[Prior art]

In this type of internal combustion engine, if air enters the oil pump ((11. When newly refilling the oil tank), (2) 1. Due to a large change in the engine's attitude, the oil pump will stop filling the oil tank. (e.g., if the oil pump is located above the surface level), the oil pump will not operate smoothly, and as a result, there is a risk that the moving valve unit of the internal combustion engine may seize.

For this reason, oil pumps require air venting devices.

In order to easily and automatically perform such air venting, the applicant communicates the air venting port of the oil pump with the inside of the oil tank via an air venting channel, and arranges this air venting channel above the position of the air venting port. (Japanese Patent Application No. 39-135195).

However, in the device of the invention of this application, (1) the air is removed only by the weight of the oil, so it takes time to remove the air (especially at low temperatures); and (2) the oil pump If the difference between the position of the inlet port and the oil level in the oil tank becomes small, or if the viscosity of the oil increases, the resistance of the oil flow toward the oil pump in the air vent passage and the oil Air may flow back into the oil pump because the difference in resistance to the flow of oil toward the oil pump in the flow path (the flow path that connects the oil tank outlet and the oil pump inlet) increases. There is.

In particular, because a fine mesh strainer is installed on the oil tank side of the oil flow path, this resistance difference tends to become even larger, and as a result, the air in the air vent flow path is more likely to flow backwards. This had the following disadvantages.

[Purpose of the invention]

This invention is an improvement on the invention of the application in order to eliminate the above-mentioned disadvantages, and its objectives are (1) to quickly bleed air from the oil pump, and (2) to improve the position of the oil pump suction port. To provide an air venting device that prevents air from flowing backward even when the difference between the oil level and the oil level in an oil tank becomes small or when the viscosity of the oil increases.

[Means to achieve the above purpose]

This purpose is to provide an oil pump for an internal combustion engine that has an air vent and discharges air that has entered the interior through the air vent, and the air vent is communicated with a negative pressure generating part of the internal combustion engine via an air vent passage. , and an auxiliary chamber having an upper opening and a lower opening is installed in the middle of the air vent passage, and further,
The auxiliary chamber is communicated with the air vent port through the lower opening and communicated with the negative pressure generating section through the upper opening, and further, a float body is housed in the auxiliary chamber so as to be movable up and down, and the float body This was achieved by providing a valve member protruding upward from the body, and opening and closing the upper opening of the auxiliary chamber with the valve member as the flow I body moves up and down.

[Action of the invention]

Since the automatic air venting device for an internal combustion engine oil pump according to the present invention is configured as described above, the air venting port of the internal combustion engine oil pump communicates with the negative pressure generating section of the internal combustion engine via the air venting passage. Further, an auxiliary chamber having an upper opening and a lower opening is installed in the middle of the air vent passage, and further, this auxiliary chamber communicates with the air venting port via the lower opening and also communicates with the upper opening. furthermore, a float body is housed in the auxiliary chamber so as to be movable up and down, and a valve member is provided on the float body to protrude upward; Since the upper opening of the auxiliary chamber is opened and closed as the float body moves up and down, the air in the oil pump is sucked and discharged toward the negative pressure generating section of the internal combustion engine by the suction pressure of the engine. At this time,
The oil in the oil pump is also sucked at the same time, but when the sucked oil enters the auxiliary chamber, the float body rises and the valve member closes the upper opening before the oil reaches the upper opening of the auxiliary chamber. Therefore, oil does not flow to the f+, pressure generating section side.

Note that after the upper opening is closed by the valve member in this way, the suction action in the air vent passage does not proceed, and air is collected in the upper part of the auxiliary chamber only by buoyancy.

[Explanation of Examples] Hereinafter, the present invention will be described in detail based on the drawings.

In FIG. 4, 11 is a three-cylinder, two-stroke outboard engine, 13 is a carburetor connected to this engine 11 via an intake manifold 15, and 17 is an intake box connected to this carburetor 13. .

The air sucked from this intake box 17 is vaporized by the vaporizer 231.
3, it is mixed with fuel and sent into the crankcase of the engine 11 via a reed valve (not shown).

Next, 19 is a fuel pump, which is installed in the carburetor 13. This fuel pump 19 operates based on the drive of the engine 11, and after passing the fuel in the fuel tank (not shown) through the fuel filter 21,
3. Supply to...

23 is an oil tank, which is screwed to the upper side of the engine 11. An oil outlet 25 is provided at the bottom of the oil tank 23, and one end of a drain pipe 27 is also connected thereto.

Reference numeral 29 denotes an oil pump, which is installed below the oil tank 23 on the side of the engine 11. or,
Reference numeral 31 denotes a suction pipe, one end of which communicates with the inside of the oil tank 23 via a strainer 33, and the other end connected to a suction port 35 of the oil pump 29 (see FIG. 2).

The oil pump 29 operates based on the drive of the engine 11, and supplies lubricating oil in the oil tank 23 to the intake manifold 15 and, in turn, to the relative moving parts of the engine 11 via supply pipes 34, 34, 34. Reference numeral 37 denotes an air vent pipe, which is installed above the pump 29 and extends approximately vertically, and then connects to the intake manifold i1 of the engine 11.
It joins 5. This air vent pipe 37 is for discharging air that has entered the primary side of the pump 29 using buoyancy. Reference numeral 39 denotes an auxiliary chamber, which is installed in the middle of the air vent pipe 37. This auxiliary chamber 39 constitutes a main part of the present invention, and is responsible for preventing backflow of oil and retaining air.

Next, 41 is a discharge amount adjustment lever, and the oil pump 2
9) is movably installed. This discharge HI
The D-section lever 41 is interlocked with the throttle valve of the carburetor 313 via a link mechanism, and swings in response to opening and closing of the throttle valve.

Note that 43 is a cowling that covers the engine 11.

Next, the oil pump 29 and the auxiliary chamber 39 will be described in detail based on FIGS. 1 to 3.

The oil pump 29 operates based on the rotation of the crankshaft (vertical crankshaft) (not shown) of the engine 11 via the worm 55 and the worm wheel member 57. The worm wheel member 57 moves up and down twice per revolution by the operation of the cam 79. 61 is a first pump chamber, 67 is a second pump chamber, which pumps based on the vertical movement of the worm wheel member 57, and which pumps the suction port 3.
5.35 (see FIG. 2) is pumped into the intake manifold 15 through discharge nozzles 63 and 65.71, respectively.

Reference numeral 73 denotes a cam mechanism that adjusts the discharge between the first pump chamber 61 and the second pump chamber 67, and is operated in conjunction with the throttle lever. This cam mechanism 73 increases the discharge amount of the first pump chamber 61 and the second pump chamber 67 when the throttle valve opens wide, and increases the discharge amount of the first pump chamber 61 and the second pump chamber 67 when the throttle valve opens small. The discharge amount of the second pump chamber 67 is reduced. Note that 53 is an air vent.

Next, the auxiliary chamber 39 will be described in detail based on FIG.

In the figure, 85 is the main body of the auxiliary chamber 39, which has an opening 87 at the top. Further, 89 is a lid body, and a sealing material 91
The opening 87 of the main body 85 is covered through the opening 87 of the main body 85. Reference numeral 93 denotes a lower connecting pipe portion (corresponding to the lower opening of the present invention), which is integrally formed at the bottom of the main body 85. This lower connecting pipe portion 93 communicates with the air vent port 53 of the oil pump 29 via the air vent pipe 37. 95 is an upper connecting pipe portion (corresponding to the upper opening of the present invention);
It is integrally formed on the surface of the lid body 89. Further, 97 is a connecting pipe, which is fitted into the upper connecting pipe part 95.

This connecting pipe 97 connects the upper connecting pipe 95 and the air vent pipe 3.
7 is connected. Note that the other end of the air vent pipe 37 communicates with the intake manifold 15 of the engine 11.

Further, 99 is a float body, which is housed in the auxiliary chamber 39. This float body 79 moves up and down in accordance with the rise and fall of the liquid level (lubricating oil) in the auxiliary chamber 39. Reference numeral 101 denotes a swing piece, which is swingably supported on the inner wall surface of the auxiliary chamber 39.
03, and one end thereof is fixed to the float body 99. Therefore, this swing piece 101 swings according to the vertical movement of the float body 99. Reference numeral 103 represents a valve support portion of the swinging piece 101, and is formed in a substantially U-shape. This valve support part 1
03 is for supporting a needle valve member 105 which will be described later. 107 is a long hole with one end (tip edge) open;
Reference numeral 9 denotes a convex portion located below the elongated hole 107, and is formed on the valve support portion 103 of the swinging piece 101, respectively. The functions of the elongated hole 107 and the convex portion 109 will be described later.

Reference numeral 105 denotes a needle valve member, which is arranged in the upper part of the auxiliary chamber 39. This needle valve member 105 is connected to the upper connecting pipe portion 9.
This is for opening and closing the pore portion 95a in 5.

Reference numeral 111 denotes a mounting rod, which is provided to protrude from the bottom surface of the needle valve member 105. This mounting rod 111 is loosely fitted into the elongated hole 107 of the swinging piece 101, and its head 113 is fitted into the long hole 107 of the swinging piece 101.
It is in contact with the convex portion 109 of 01. Therefore, the rocking piece 10
1 swings, the needle valve member 105 moves up and down, and as a result,
The pore portion 95a in the upper connection pipe portion 95 is opened and closed.

The distal end of the needle valve member 105 is formed into a conical shape with an elastic material (such as rubber material) 115 in order to ensure the airtightness of the closed state in the pore portion 95a.

〔Effect of the invention〕

Since the automatic air venting device for an internal combustion engine oil pump according to the present invention is configured as described above, the air venting port of the internal combustion engine oil pump communicates with the negative pressure generating section of the internal combustion engine via the air venting passage. Further, an auxiliary chamber having an upper opening and a lower opening is installed in the middle of the air vent passage, and further, this auxiliary chamber communicates with the air venting port via the lower opening and also communicates with the upper opening. furthermore, a float body is housed in the auxiliary chamber so as to be movable up and down, and a valve member is provided on the float body to protrude upward; Since the upper opening of the auxiliary chamber is opened and closed as the float body moves up and down, the air in the oil pump is sucked and discharged toward the negative pressure generating section of the internal combustion engine by the suction pressure of the engine. At this time,
The oil in the oil pump is also sucked at the same time, but when the sucked oil enters the auxiliary chamber, the float body rises and the valve member closes the upper opening before the oil reaches the upper opening of the auxiliary chamber. Therefore, oil does not flow toward the negative pressure generating section.

Note that after the upper opening is closed by the valve member in this way, the suction action in the air vent passage does not proceed, and air is collected in the upper part of the auxiliary chamber only by buoyancy.

Therefore, by using this device, (1) air can be removed from the oil pump quickly, and (2) the difference between the position of the oil pump suction port and the oil level of the oil tank can be reduced. Also, even if the viscosity of the oil increases, the air remaining in the air flow path will not flow back.

[Brief explanation of drawings]

The drawings show an embodiment of the automatic air venting device for an internal combustion engine oil pump according to the present invention, and FIG. 1 is a partially enlarged sectional view of FIG. 4, and FIG.
A cross-sectional view taken along the line ■-■ in the figure, Figure 3 is I in Figure 2.
[A sectional view taken along the line I-III, and FIG. 4 is a front view of this embodiment. 11... Internal combustion engine (engine) 15...
Negative pressure generating part (intake manifold) 29...Oil pump 37...Air vent flow path (air vent pipe) 39...Auxiliary chamber 53...Air vent 93...Lower opening (for lower connection) Pipe part) 95
・・・ Upper opening (upper connection pipe part) 99 ・・・
Float body 105... Valve member (needle valve member) Patent applicant: Sanshin Kogyo Co., Ltd. Figure 2, Figure 1- Figure 3, Figure 4, 43,

Claims (1)

[Claims] (1) In an oil pump for an internal combustion engine, which has an air vent and discharges air that has entered the interior through the air vent, the air vent communicates with a negative pressure generating section of the internal combustion engine via an air vent passage, and , an auxiliary chamber having an upper opening and a lower opening is installed in the middle of the air venting passage; further, the auxiliary chamber communicates with the air venting port via the lower opening, and the auxiliary chamber communicates with the air venting port via the upper opening; It communicates with the negative pressure generating section, and furthermore, a float body is housed in the auxiliary chamber so as to be movable up and down, and a valve member is provided on the float body to protrude upward, and the valve member is connected to the float body. An automatic air venting device for an oil pump for an internal combustion engine that opens and closes an upper opening of the auxiliary chamber as the oil pump moves up and down.