JPS5939129Y2 - Internal combustion engine oil pump device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an oil pump device for an internal combustion engine, which is mainly used in a horizontal engine for working power.

For example, single-cylinder or two-cylinder horizontally mounted diesel engines are often used to power agricultural work, and in this type of engine, the camshaft is supported on the side wall of the crankcase that forms the main body of the engine. Adjacent to the same camshaft,
A manual starting shaft is mounted on a bearing, and a pair of mutually meshing gears are attached to both shafts, so that the engine is started via a camshaft.

In conventional engines with this type of structure, a trochoid-type lubricating oil pump is located near the bearing on the opposite side of the camshaft, and the oil pump is designed to be driven by the camshaft. It is normal to do so.

By the way, the important characteristics required for this type of work power engine as a product are that the mechanism is simple, durable, and low in price.However, in the conventional general structure, the oil pump Power 1 is attached independently, therefore, the cost is pushed up as an auxiliary equipment cost,
In addition, it had the disadvantage that it was long and cluttered in terms of space.

The present invention has been made to solve the above-mentioned drawbacks, namely: 1. SUMMARY OF THE INVENTION An object of the present invention is to provide an oil pump device for an internal combustion engine that utilizes existing members to perform the pumping action.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

In the horizontal engine equipped with the oil pump device of the example,
As shown in Figures 1 to 3, a crankcase 1 forming the main body of the engine is installed on a stand 2, and a part n of the starting mechanism attached to the side wall 1a constitutes an oil pump. There is.

Specifically, a portion of the side wall 1a near the center is
It is formed of a double wall of an inner wall 1b and an outer wall 3, and both walls 1b and 3 are fastened to each other with four bolts 12,
A space, which will be described later, is formed between the walls 1b and 3, and a seal ring 4 is fitted around the abutting periphery of the inner wall 1b and the outer wall 30 to maintain oil tightness.

Therefore, O-rings 5 are attached to both the inner wall 1b and the outer wall 3.
The starting shaft 6 is supported through the inner wall 1b of the starting shaft 60 on the left side in the drawing, and the end of the camshaft 7 is supported by a bearing.

Furthermore, both walls 1b of the starting shaft 6 and the camshaft 7, respectively.

A pair of mutually meshing transmission gears 8 and 9, each having a tooth width inscribed in the inner wall space, are pivotally mounted in the portion between 3 and 3, and are prevented from rotating by keys 10 and 11, respectively.

Note that the starting shaft 6 has a hooking collar 6a on the outward protrusion.
are integrally formed, and at the time of starting operation, a starting handle (not shown) is hooked onto the collar 6a, and the starting shaft 6 is operated and driven by human power.

Other than that, the formation of the camshaft 7 other than that described above is the same as that in conventional engines of this type.
In addition, the injection pump 16 is driven by the injection pump cam 7a.

Since the engine starting mechanism is configured in this way, in order to start the engine, it is only necessary to drive the starting shaft 6 by input using the starting handle.
If you turn clockwise in the figure, the camshaft 7 will rotate counterclockwise at a constant speed through the gear 8°9, and in conjunction with this, the crankshaft 15 will be driven clockwise at double speed, and as a result, the engine can be easily rotated. It takes.

Next, in the space between the inner wall 1b and the outer wall 3, in addition to the above-mentioned pair of gears 8 and 9, there is also a suction side pump chamber 18 equipped with an oil suction passage 17, and an oil suction side pump chamber 18 having an oil suction passage 17. A discharge pump chamber 20 with a discharge passage 19 is bored, each passage 17 and 19 being connected to the lubrication system of the engine (not shown).

Due to this structure, between the rotations of gears 8 and 9, gear 8
, 9, oil is sucked into the pump chamber 18 and discharged from the pump chamber 20, that is, the engine oil is pressurized as in the case of a normal gear pump.

In this way, in the pump device of the embodiment, the starting transmission gears 8 and 9 operate the oil pump by simply forming the side wall 1a into a double wall, and therefore no other pump space is required. Not only does it cost nothing, but it also costs almost nothing.

As described above, according to the oil pump device for an internal combustion engine according to the present invention, the side wall of the crankcase is formed in double layers so that the existing starting power transmission gear has a pumping action. There is no need to separately equip an oil pump, which has the practical effect of simplifying the structure of the engine and reducing the manufacturing cost of the engine.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an engine equipped with an oil pump device for an internal combustion engine showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of part H in FIG. 1, and FIG. FIG. 2 is a schematic end view taken along the Kawa-m line in FIG. 2; 1... Crankcase, 1a... Side wall, 1b...
Inner wall, 3... Outer wall, 6... Starting shaft, 7... Camshaft, 8, 9... A pair of gears, 17... Oil suction passage, 18.20... Suction side and the pump chamber on the discharge side, 19
...Oil discharge passage.

Claims (1)

[Scope of utility model registration request] The side wall of the crankcase that bears the camshaft of the internal combustion engine bears a starting shaft driven by an external operating force, and
In an oil pump device for an engine, a pair of gears that mesh with each other are attached to a camshaft and a starting shaft, thereby starting the engine via the camshaft,
The bearing portion of the side wall of the crankcase is formed of an inner and outer double wall, and each of the pair of gears is sandwiched in the opposing space of the double wall. A pump chamber space with a suction passage and an oil discharge passage is opened (and the above pair of gears forming the engine starting power transmission system are used as pressurizing means for the engine lubrication system. An oil pump device for an internal combustion engine characterized by: