JP2003214130A - Lubricating device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating device for an engine capable of sufficiently lubricating and cooling a high temperature member by one set of an oil pump and suppressing deterioration of oil and a fluctuation of an oil return amount by avoiding the influence by choppy oil in an oil pan. <P>SOLUTION: In a lubricating device for an engine formed that a reserve tank containing oil is situated separately from the oil pan of an engine, the reserve tank is situated in a portion situated below the oil pan and an oil pump is situated in the vicinity of the reserve tank. Further, a oil filler pipe is provided to interconnect the discharge port of the oil pump and the lubrication spot of the engine, and oil in the reserve tank can be directly fed to a lubrication required spot through the oil filler pipe by the oil pump in the reserve tank. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubrication device in which a reserve tank for storing oil is installed separately from an oil pan of the engine.

[0002]

2. Description of the Related Art In a general-purpose engine, in order to realize maintenance-free operation that does not require maintenance of the engine for a long time, it is necessary to secure an oil amount that sufficiently considers oil (lubricating oil) consumption and oil deterioration. Therefore, it is common to provide a reserve tank in addition to the oil pan of the engine body in order to cope with such a demand.

As one of such means, an actual Kaihei 4-10 is used.
A device of No. 4117 has been proposed. This is because a reserve tank is provided in the lower part of the engine separately from the oil pan of the engine main body, an oil pump for supplying oil from the reserve tank to the oil pan of the engine main body through an oil supply pipe, and an upper end in the oil pan. It has an overflow pipe that opens at a predetermined height position and the lower end opens into the reserve tank so that the oil level in the oil pan in the engine body can always be automatically maintained at a constant level. is there.

Further, as one of means for directly supplying oil to a specific portion of the engine, Japanese Patent Laid-Open No. 59-215908.
No. invention has been proposed. In such a two-cycle engine, such means controls the oil level in the sub tank by an electric circuit in the control box while the oil from the main oil tank is pumped up to the sub tank by the pump. Flows through an intake pipe into an oil pump, which pumps the oil to the intake manifold of each cylinder, and lubricates each part of the engine with this oil before burning. Further, the oil pump is configured to supply oil directly to the bearing portion of the crankshaft or the like to complementarily lubricate a specific portion.

[0005]

However, in the invention of Japanese Utility Model Laid-Open No. 4-104117, the maintenance interval of oil consumption is extended and the deterioration rate of oil is alleviated due to the increase in the amount of oil in the reserve tank when the engine is operated for a long time. However, if the interior of the engine, especially around the exhaust valve with a high heat load in the combustion chamber, is exposed to high temperature for a long time, there is a problem that lubrication becomes insufficient and wear of the valve guide and the like increases. That is, in such a conventional technique, the oil pump is used only for keeping the oil level constant, and it cannot be said that the oil pump is necessarily used effectively from the viewpoint of improving the cooling performance. Further, since the overflow pipe in such a conventional technique merely stops at a predetermined height position in the oil pan, it is greatly affected by ripples on the oil surface in the oil pan and oil splashes,
There is a problem that the amount of oil returned to the reserve tank is not constant and the oil level of the oil pan cannot always be maintained at a constant level.

Further, in the invention of Japanese Patent Laid-Open No. 59-215908, the structure is complicated such that the oil level in the sub tank is controlled by an electric circuit, and the main oil tank is once pumped up to the sub oil tank. Since another oil pump supplies oil to each part, a plurality of oil pumps are required, resulting in a problem of increased device cost.

The present invention has been made in view of the above problems of the prior art.
An engine capable of sufficiently performing lubrication and cooling of a high temperature member with one oil pump, suppressing deterioration of oil, and avoiding the influence of ripple of oil in an oil pan to suppress fluctuation of oil return amount It is an object of the present invention to provide a lubricating device of

[0008]

SUMMARY OF THE INVENTION To solve the above problems, the present invention provides a lubrication system for an engine comprising a reserve tank for storing oil separately from an oil pan of the engine. In the device, the reserve tank is installed at a position lower than the oil pan, and an oil pump is provided near the reserve tank.
Further, an oil supply pipe connecting the discharge port of the oil pump and the lubrication required part of the engine is provided, and the oil in the reserve tank can be directly supplied to the lubrication required part by the oil pump through the oil supply pipe. An engine lubrication device characterized by the above is proposed.

According to this invention, the low temperature oil returned from the oil pan into the reserve tank is directly lubricated by the oil pump through the oil supply pipe to the high temperature members such as the exhaust valve and valve operating devices. The lubrication and cooling of the members can be performed simultaneously and sufficiently to improve the durability of the high temperature member, and the oil from the oil pan is stored in the reserve tank to be sufficiently cooled and the oil from which foreign substances are removed is required. Since the oil is supplied to the lubrication unit, deterioration of oil is suppressed. Further, it is possible to sufficiently lubricate the lubrication required part by only providing an oil pump in the vicinity of the reserve tank without providing a special lubrication control means, and the device cost is reduced.

In addition to Claim 1, the invention described in Claim 2
A bypass pipe branching from the middle of the oil supply pipe and connected to the reserve tank is provided, and a throttle mechanism is provided on either or both of the oil supply pipe and the bypass pipe. According to this invention, by the throttle mechanism provided on either or both of the oil supply pipe and the bypass pipe, the flow rate of the oil supplied to the lubrication necessary portion through the oil supply pipe can be constantly maintained at an appropriate flow rate, It is possible to avoid an increase in oil consumption and an accelerated deterioration of oil due to useless refueling.

The invention according to claim 3 is, in addition to claim 1,
A return pipe that connects the inside of the reserve tank and the inside of the oil pan and opens at a predetermined height position inside the oil pan is provided, and the oil level near the opening of the return pipe and the oil level inside the oil pan are It is characterized by the provision of a wall for preventing ripples. According to this invention, when the oil surface in the oil pan exceeds the return pipe opening surface, the oil in the oil pan is returned to the reserve tank below through the return pipe by natural fall, and in the vicinity of the opening portion of the return pipe. Since the oil surface of the oil pipe is separated from the oil surface in the oil pan by the ripple preventing wall, the oil surface near the opening of the return pipe is always kept constant without being affected by the ripple of the oil surface in the oil pan. , The fluctuation of the amount of oil returned to the reserve tank via the return pipe is prevented,
Oil can be stably supplied to the engine body.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are merely illustrative examples, without any intention of limiting the scope of the present invention thereto unless otherwise specified. Absent.

FIG. 1 is a front view of a lubricating device for a general-purpose engine according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a return pipe opening (enlarged sectional view of FIG. 1).

In FIG. 1 showing an embodiment of the present invention, reference numeral 1 is a general-purpose engine (hereinafter referred to as engine), which is constructed as follows. Reference numeral 2 is a crankcase, and an oil pan 3 is formed below the crankcase. Reference numeral 4 is a cylinder, and 5 is a cylinder head. Reference numeral 6 denotes a cylinder head cover, and the inside thereof is a rocker chamber in which valve operating device components (not shown) are provided. The lubrication method of the engine 1 is generally an oil splashing method using an oil dipper attached to a connecting rod (not shown), and the valve operating device parts are lubricated by the splash oil coming from the inside of the crankcase 2.

Reference numeral 7 is a reserve tank installed below the oil pan 3, 8 is an oil pump installed near the reserve tank 7, and 9 is an oil filter provided in a suction portion of the oil pump 8. Reference numeral 10 denotes an oil supply pipe, one end of which is opened on the discharge side of the oil pump 8 and the other end of which is opened to the rocker chamber (not shown). The refueling pipe 10
As for the copper pipe or the steel pipe, part or all of the flexible pipe structure may be used to prevent damage due to vibration of the engine 1. A bypass pipe 20 returning from the middle portion of the oil supply pipe 10 to the reserve tank 7 is provided, and the oil supply pipe 10 and the bypass pipe 20 are provided with throttle portions 21a and 21b. The diaphragm 21
a and 21b are the oil supply pipe 10 and the bypass pipe 2
It may be provided in either one of 0.

In FIGS. 1 and 2, reference numeral 11 denotes a return pipe, the upper end of which is opened at a predetermined height position in the oil pan 3 and the lower end of which is opened to the upper air layer 07 in the reserve tank 7. The return pipe 11 may be a copper pipe, a steel pipe, or a part or all of the flexible pipe structure similarly to the oil supply pipe 10 described above. Reference numeral 12 is a bolt for fixing the return pipe 11 to the crankcase 2. 13 is provided so as to surround the return pipe 11 and has an oil level 011 near the return pipe 11.
An oil port 14 is provided in the upper part, and an opening part 15 that opens into the oil in the oil pan 3 is provided in the lower part of the wall for preventing ripples that separates the oil surface 03 in the oil pan 3 from the oil surface 03.

In a general-purpose engine having an engine lubrication device having such a structure, when the engine 1 is started by a cell starter (not shown) or the like, an oil depper attached to a connecting rod (not shown) rotates and the oil in the oil pan 3 is rotated. To lubricate the sliding portion of each moving member such as a piston (not shown). Further, oil splashes come into the locker chamber to lubricate the valve operating device parts.

On the other hand, when the oil pump 8 is driven by a battery (not shown) and starts pumping at the same time when the engine 1 is started, foreign matter in the oil in the reserve tank 7 is filtered by the oil filter 9 and the oil pump 8 is sucked into the oil pump 8 and is sent under pressure to the oil supply pipe 10 through the discharge port of the oil pump 8. Then, the oil pressure-fed to the rocker chamber via the oil supply pipe 10 drips from an upper portion of an exhaust valve (not shown) to complementarily lubricate and cool the exhaust valve and its surroundings which are at a high temperature. At the time of such refueling, the refueling amount through the refueling pipe 10 and the return amount through the bypass pipe 20 are adjusted by adjusting the squeezing area of the squeezing portions 21a and / or 21b, and the oil is squeezed to the rocker chamber through the refueling pipe 10. The flow rate of the oil to be supplied can be adjusted so as not to adversely affect the performance and the like, and by supplying oil wastefully so as not to accelerate the deterioration of the oil.

As described above, the oil, which has been lubricated and cooled in the high temperature area around the exhaust valve where lubrication is required, flows down to the oil pan 3. If the amount of oil in the oil pan 3 is less than a certain amount, it will be accumulated in the oil pan 3, but if it is more than a certain amount, that is, if the oil pan oil level 03 exceeds the upper end opening position of the return pipe 11, the oil in the oil pan 3 will be stored. Flows down from the return pipe 11 into the reserve tank 7 below by natural fall. Further, as described above, since the rippling prevention wall 13 is provided around the return pipe 11, even when the oil pan 3 is ruffled, it is blocked by the rippling prevention wall 13 and near the opening of the return pipe 11. The fluctuation of the oil level 011 and the fluctuation of the amount of oil returned to the reserve tank 7 due to the fluctuation are suppressed.

According to this embodiment, the oil pump 8 and the oil supply pipe 10 for supplying oil from the reserve tank 7 provided below the oil pan to the main body of the engine 1.
And a return pipe 11 whose upper end opens at a predetermined height position in the oil pan 3 and whose lower end opens in the reserve tank 7.
By providing the anti-corrugation wall around the return pipe 11, it is possible to stably supply oil to the main body of the engine 1 and to lubricate a specific part such as a high temperature member of the engine 1 with one oil pump. Cooling is necessary and sufficient.

[0021]

As described above, according to the present invention, the low temperature oil in the reserve tank is directly lubricated by the oil pump through the oil supply pipe to the high temperature member such as the valve operating device. Cooling can be performed simultaneously and sufficiently to improve the durability of the high temperature member,
The oil from the oil pan is stored in the reserve tank to be sufficiently cooled, and the oil from which foreign matters have been removed is supplied to the lubrication-required portion, so that deterioration of the oil is suppressed. Further, it is possible to sufficiently lubricate the lubrication required part by only providing an oil pump in the vicinity of the reserve tank without providing a special lubrication control means, and the device cost is reduced.

According to the second aspect of the invention, the throttle mechanism provided on either or both of the oil supply pipe and the bypass pipe ensures that the flow rate of the oil supplied to the lubrication required portion through the oil supply pipe is always appropriate. The flow rate can be maintained, and it is possible to avoid an increase in oil consumption due to useless refueling and an accelerated deterioration of oil.

According to the third aspect of the invention, when the oil surface in the oil pan exceeds the return pipe opening surface, the oil in the oil pan is returned to the lower reserve tank by natural fall through the return pipe, Moreover, since the oil surface near the opening of the return pipe is separated from the oil surface inside the oil pan by the ripple preventing wall, the oil surface near the opening of the return pipe is affected by the ripple of the oil surface inside the oil pan. It is constantly held constant without being affected, fluctuations in the amount of oil returned to the reserve tank via the return pipe are prevented, and stable oil supply to the engine body becomes possible.

[Brief description of drawings]

FIG. 1 is a front configuration diagram of a lubricating device for a general-purpose engine according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a return pipe opening (Z section enlarged cross-sectional view of FIG. 1).

[Explanation of symbols]

1 engine 2 crankcase 3 oil pan 5 cylinder head 6 Cylinder head cover 7 reserve tank 8 oil pump 9 Oil filter 10 Refueling pipe 11 Return pipe 13 Ripple prevention wall 20 Bypass pipe 21a, 21b throttle part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F01M 11/00 F01M 11/00 S 11/02 11/02 F term (reference) 3G013 BA04 BB05 BC11 BC19 BD12 BD46 BD47 CA05 DA18 3G015 BB07 BB11 BC02 BC03 CA07 DA02

Claims (3)

[Claims] 1. A lubricating device for an engine, wherein a reserve tank for storing oil is installed separately from an oil pan of the engine, wherein the reserve tank is installed below the oil pan and the vicinity of the reserve tank. An oil pump is provided in the oil pump, and an oil supply pipe connecting the discharge port of the oil pump and the lubrication required part of the engine is provided, and the oil in the reserve tank is supplied to the lubrication required part via the oil supply pipe by the oil pump. An engine lubrication device characterized in that it can be directly supplied. 2. A bypass pipe branching from the middle of the oil supply pipe and connected to the reserve tank is provided, and a throttle mechanism is provided on either or both of the oil supply pipe and the bypass pipe. Item 1. The engine lubricating device according to item 1. 3. A return pipe is provided which connects the inside of the reserve tank and the inside of the oil pan and opens at a predetermined height position in the oil pan, and the oil surface near the opening of the return pipe and the inside of the oil pan. The engine lubrication device according to claim 1, further comprising: a ripple preventing wall that separates the oil surface from the oil surface.