JPS6335137Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an oil drain mechanism for a small general-purpose engine such as a generator-driven engine, and more specifically, the invention relates to an oil drain mechanism for a small general-purpose engine such as a generator-driven engine. This relates to an oil drain mechanism that drains oil using the gauge rod in a conventional engine.

[Prior art] Conventionally, in small general-purpose engines, an oil check hole that also serves as an oil filler port is opened on one side wall of the crankcase, and an oil level gauge rod (particularly a tubular gauge rod) can be freely inserted and removed from the hole. For example, a device that is inserted so that both oil checking and refueling can be performed from one oil check port is disclosed in Japanese Utility Model Application Publication No. 52-105639, Japanese Utility Model Application Publication No. 53-82635, etc. Therefore, it is publicly known.

In addition, as an oil drain device for the engine, a passage extending in the axial direction and an outlet passage opening in a direction perpendicular to the axial direction are formed inside a plug that is screwed into an oil drain port opened at the bottom of the crankcase. For example, Japanese Utility Model Application Publication No. 149133/1984 has proposed a system in which oil can be drained without completely removing the stopper from the oil drain port.

[Problem that the invention attempts to solve]

In the above-mentioned prior art, even if according to the former prior art it is possible to perform both oil level checking and refueling using the oil check port,
No particular consideration is given to draining oil from the oil check port, and a dedicated oil draining device for draining the oil is required, which complicates the engine components.

In addition, the oil drain device according to the latter prior art has the advantage that the oil can be drained easily without completely removing the plug screwed into the oil drain port. However, in the case of the latter prior art, it is impossible to check the oil level from the oil drain port, so a separate oil level checking device is required, which avoids complicating the engine components. Moreover, in this latter prior art, when the plug of the oil drain port is screwed in the direction of loosening, the passage outlet immediately opens to the outside and the oil immediately flows out. If the engine is housed in a casing, such as a commercial engine, an oil drain port should be provided that protrudes outside the casing, or a special tub for draining oil may be provided that protrudes outward. Otherwise, there would be problems such as oil dripping into the casing and staining the surrounding area during oil draining.

[Means for solving problems]

The present invention was proposed to address the above-mentioned problems, and is characterized by the following configuration.

In other words, the present invention provides (A) a gauge rod that is inserted into the side wall of the crankcase from diagonally above into the case and has a length that allows the minimum oil level to be detected; (B) the gauge rod and its (C) A threaded portion is formed in the insertion hole so that the gauge rod can be pulled out to the required length while the gauge rod is in the screwed state; and a passage outlet opening perpendicular to the axial direction near the top of the passage are provided in communication with each other, and (D) when the gauge rod is screwed into the insertion hole, the passage outlet is blocked and the insertion hole is blocked. When the gage rod is pulled out the required length from the hole, the passage outlet protrudes from the insertion hole and opens to the outside, and by tilting the engine, oil can be drained from the passage outlet through the passage in the gauge rod. That is.

[Effect]

With this configuration, the oil level gauge rod installed in the engine can be used to drain the oil, so it can be used for both oil checking and oil draining. Oil can be drained without completely removing the gauge rod, which simplifies the oil draining process by eliminating the trouble of removing the rod.In addition, since the gauge rod is not removed, there is no inconvenience such as losing it, and the oil can be drained easily. Since the oil drainage structure uses a level gauge rod, even if the passage and passage outlet formed in the shaft part of the gauge rod are opened to the outside by pulling out the gauge rod, oil will not immediately flow out from the passage outlet. Oil does not flow out unless the engine is tilted, and the passage outlet is opened by protruding outward for a required length using the shaft of the gauge rod as an oil drainage passage. Even in the case where the oil is housed in the casing, inconveniences such as oil dripping into the casing and staining the surrounding area can be completely avoided.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

The drawing shows an example in which the present invention is applied to a small general-purpose engine used as an engine for driving a generator. Reference numeral 1 indicates an engine, 2 indicates a crankcase of the engine, and 3 indicates a cylinder. The engine 1 is installed in a casing 4 that surrounds the entire generator, and within this casing 4, a generator 6 is installed adjacent to and on the side of the engine 1. 5 and generator 6
are directly connected to the input shaft 7.

The engine is provided with an oil level insertion hole 9 that opens diagonally upward in one side wall of the crankcase 2, facing the plug insertion hole 8 bored in the side wall of the casing 4. A female screw 10 is formed in the hole 9, and this female screw 1
A plug-shaped gauge rod 11 is screwed into the insertion hole 9 through the threaded hole 9 so that it can be pulled out for a required length in the screwed state.

The gauge rod 11 has a length that allows its insertion tip to detect the lowest oil level of the oil put into the crankcase 2 when it is completely screwed into the insertion hole 9. By separating from the insertion hole 9 and reading whether or not the tip is in contact with oil, it functions as an oil gauge that can detect whether the oil in the bottom of the crankcase is filled to the lowest oil level. It is something that you have.

The gauge rod 11 has a knob 11 on its top.
a, and the main shaft has a passage 12 extending in the axial direction from the insertion tip to a position near the knob 11a at the top, and a passage 12 in a direction perpendicular to the axial direction at a position close to the knob 11a. When the gauge rod 11 is completely screwed into the insertion hole 9, the passage outlet 13 is closed by the insertion hole 9, and when the gauge rod 11 is inserted. When the required length is pulled out from the hole 9, the insertion hole 9 is inserted.
It is configured to protrude further and open to the outside.

In such a configuration, normally, when functioning as an oil gauge, the gauge rod 11 is completely screwed into the insertion hole 9. In this state, the passage exit 13
is closed by the insertion hole 9, and the top is closed by packing 14 in a fluid-tight manner.

Also, when draining oil, insert the gauge rod 11 into the insertion hole 9.
When the plug is screwed in the loosening direction and pulled out the required length so that the knob 11a at the top is positioned outside the plug insertion hole 8 as shown in FIG. 2, the passage outlet 13 protrudes outward from the insertion hole 9. and open it. In this open state, the passage outlet 13 is located at a higher position than the oil level surface, and no oil flows out.

If the passage outlet 13 is positioned downward and the engine is tilted, the oil in the crankcase 2 will flow through the passage 12 formed in the shaft of the body of the gauge rod 11 to the passage outlet 13 due to the tilt.
Oil is drained outside from 3.

Therefore, even if the insertion tip of the gauge rod 11 protrudes slightly into the crankcase 2 during this oil drainage, this does not cause any problems, since it only increases the amount of oil remaining in the bottom corner of the crankcase 2 on the gauge rod 11 side slightly compared to when it does not protrude.

During this oil draining, the passage outlet 13 is
Since the gauge rod 11 is opened and protrudes outward from the casing 4 as an oil drainage passage, the passage outlet 13
There is no risk that the oil flowing out will drip into the casing 4 and stain the inside of the casing 4.

Also, under normal conditions, when the gauge rod 11 is completely screwed into the insertion hole 9, the knob 11a at the top is inside the casing 4 from the plug insertion hole 8 (see Figure 1). It does not protrude outside and get in the way, and there is no problem of it coming into contact with other objects and being damaged.

[Effect of idea]

Since the present invention has the configuration described in detail above, the following effects can be obtained.

First, according to the present invention, the oil level gauge rod 1 installed in the engine can be used to drain the oil, allowing for multifaceted use of the components and simplifying the engine components. Benefits that can be achieved.

In addition, since the configuration allows oil to be drained without completely removing the gauge rod 11 from the insertion hole 9 during oil draining work, the trouble of removing the gauge rod 11 during oil draining work can be saved and the oil draining work can be simplified. In addition to being simple, it also eliminates the inconvenience of losing the gauge rod 11 because it is not removed.

Furthermore, since the oil drain configuration uses the oil level gauge rod 11, even if the passage 12 and passage outlet 13 formed in the shaft part by the screwing of the gauge rod 11 open outward, the passage outlet 13
In addition, the structure is such that oil does not suddenly flow out unless the engine is tilted, and the passage outlet 13 is opened by protruding outward using the shaft of the gauge rod 11 as an oil drainage passage. For example, even when the engine is housed in a casing, inconveniences such as oil dripping into the casing and staining the surrounding area can be completely avoided.

[Brief explanation of the drawing]

FIG. 1 is an overall longitudinal sectional side view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view of the main parts showing the case where the oil is drained. 1...Engine, 2...Crankcase, 3...Cylinder, 4...Casing, 5...Crankshaft,
6... Generator, 7... Input shaft, 8... Plug insertion hole, 9
...insertion hole, 10...female screw, 11...gauge rod, 12
...Aisle, 13...Aisle exit, 14...Passing.

Claims (1)

[Claim for Utility Model Registration] In an engine equipped with a gauge rod that is inserted into the side wall of the crankcase from diagonally upward into the case and has a length that allows detection of the lowest oil level, the gauge rod and its insertion hole are provided. A threaded portion is formed on the gauge rod so that the gauge rod can be pulled out a predetermined length from the insertion hole in the screwed state, and an axial passage extending from the insertion tip to near the top of the gauge rod is provided in the shaft portion of the gauge rod. A passage outlet opening in a direction perpendicular to the axial direction near the top is provided in communication with this passage, and when the gauge rod is screwed into the insertion hole, the passage outlet is blocked and the gauge rod cannot be screwed into the insertion hole. When pulled out a predetermined length in this state, the passage outlet protrudes outside the insertion hole and opens to the outside, and by tilting the engine, the oil in the bottom of the crankcase passes through the passage in the gauge rod and is drained from the passage outlet. An oil draining mechanism for an engine characterized by having a structure that allows oil to drain.