JP6476842B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine having an oil level gauge insertion hole through which an oil level gauge for detecting an oil level in a crank chamber is passed.

  In an internal combustion engine, a gauge insertion hole for mounting an oil level gauge (oil inspection rod) for checking the oil level in the crank chamber is always provided. In many cases, the gauge insertion hole is provided at a position close to the crank chamber, and is guided from there to a position with good workability by a guide tube. With the miniaturization of internal combustion engines, various auxiliary machines and parts are arranged at high density around the internal combustion engine. For this reason, it is difficult to secure a position for providing the gauge insertion hole and a path for arranging the guide tube.

  The oil level gauge insertion hole described in Patent Document 1 also serves as an oil level gauge insertion hole for an oil dropping passage for returning oil from the cylinder head to the crank chamber. At this time, in order to prevent the blow-by gas from flowing backward from the opening on the crank chamber side of the oil dropping passage, attach a guide that extends the oil dropping passage to a position where it is immersed in the oil surface (soaked in oil). Yes.

  The oil level gauge insertion port described in Patent Document 2 is provided at a portion where the intake manifold is coupled to the cylinder head. This insertion port forms a linear through hole that inclines and communicates with the oil return passage in the cylinder head from the back surface of the flange portion of the intake manifold, and the oil level is inserted into the insertion hole that opens on the back surface of the flange portion of the intake manifold. It is made by press fitting a gauge guide. The oil level gauge is inserted from the free end of the oil level gauge guide and reaches the oil pan through the oil return passage.

JP 2011-247101 A JP 2009-275519 A

  However, in the case of Patent Document 1, in order to ensure the return flow rate of the oil in the oil dropping passage into which the oil level gauge hole is inserted, a guide portion to be inserted into the oil level in the crank chamber is provided to blow-by the oil dropping passage. Although the gas is prevented from rising, the blow-by gas correspondingly flows in the other oil dropping passages. Therefore, the overall oil circulation efficiency may be reduced. Further, in the case of Patent Document 2, since a through hole is provided in the coupling portion between the cylinder head and the intake manifold, it must be designed in consideration of alignment in assembly work. And since both the patent document 1 and the patent document 2 are provided with the mounting hole of the oil level gauge in the cylinder head, not only the dimension of the internal combustion engine from the crank chamber to the cylinder head is increased, but also corresponding to it. A long oil level gauge is required and handling is inconvenient.

  Therefore, the present invention provides an internal combustion engine having an insertion hole for an oil level gauge that does not hinder the circulation of the oil and that is easy to handle the oil level gauge and does not increase the external dimensions.

An internal combustion engine according to an embodiment of the present invention is premised on having an oil level gauge insertion hole to which an oil level gauge is mounted, and the oil level gauge insertion hole includes a port, a through hole, and a partition wall. The port opens in the side wall of the cylinder block having an oil drain passage that leads from the cylinder head to the crank chamber. The through hole allows the port to communicate with the oil dropping passage. The partition wall is formed between the through hole and the oil dropping passage.

  When the cylinder block is divided into an upper block and a lower block by a first plane perpendicular to the cylinder center line and passing through the rotation center line of the crankshaft, the port is provided on the side wall of the upper block. The partition wall extends to the first plane. Further, the through hole has an angle with respect to the direction along the oil dropping passage, and approaches the oil dropping passage toward the crank chamber. Further, the port is arranged so as to deviate in the direction along the rotation center line with respect to the second plane passing through the oil dropping passage perpendicular to the rotation center line of the crankshaft. Further, the cylinder block has a water jacket arranged on the cylinder head side in the side wall, and the port is arranged at a position farther from the cylinder head than the water jacket. Further, the through hole joins the oil dropping passage at an angle at a position near the cylinder head from the first plane that is perpendicular to the center line of the cylinder and passes through the rotation center line of the crankshaft.

  According to the internal combustion engine of one embodiment of the present invention, the port of the oil level gauge insertion hole is opened in the side wall of the cylinder block, and this port is communicated with the oil dropping passage through the through hole. Therefore, the circulation of oil flowing from the cylinder head into the oil dropping passage is not hindered. Moreover, since the partition is provided, the oil flowing through the oil dropping passage does not enter the through hole. Therefore, even if blow-by gas is dropped into the oil passage, the oil does not rise into the oil level gauge insertion hole. Further, since the port is opened in the side wall of the cylinder block, the external dimension of the internal combustion engine is not increased in the direction of the center line of the cylinder, and the length of the oil level gauge itself can be set to a length that is easy to handle.

  When the cylinder block is divided into an upper block and a lower block by a first plane that is perpendicular to the cylinder center line and passes through the rotation center line of the crankshaft, a port is provided on the side wall of the upper block, and the partition wall is the upper block. According to the internal combustion engine of the invention extending to the lower end of the cylinder, the range in which the partition walls are provided inside the cast cylinder block can be set with high accuracy.

  According to the internal combustion engine of the invention which has an angle with respect to the direction along the oil dropping passage and the through hole is configured to approach the oil dropping passage toward the crank chamber, the oil blown back by the blow-by gas is Difficult to enter through holes.

  Further, according to the internal combustion engine of the present invention in which the port is removed in the direction along the rotation center line with respect to the second plane passing through the oil dropping passage perpendicular to the rotation center line of the crankshaft, the second plane Since it can suppress that the dimension of a cylinder block becomes large in the direction which follows, the external dimension of an internal combustion engine is not made bulky.

  Furthermore, according to the internal combustion engine of the invention in which the cylinder block has a water jacket disposed on the side of the cylinder head in the side wall, and the port is disposed at a position away from the water jacket with respect to the cylinder head. Since it does not overlap the water jacket in the direction, it can be suppressed that the outer dimension of the cylinder block is increased, and the outer dimension of the internal combustion engine is not bulky.

  Further, in the internal combustion engine of the invention in which the through hole is joined at an angle to the oil drainage passage at a position close to the cylinder head side from the first plane perpendicular to the centerline of the cylinder and passing through the rotation centerline of the crankshaft. According to this, even when the oil flowing through the oil dropping passage is blown back by the blow-by gas, the oil can be prevented from rising to the through hole.

The perspective view of the cylinder block of the internal combustion engine of the 1st Embodiment of this invention. The side view of the cylinder block of FIG. The perspective view which expanded the periphery of the oil level gauge insertion hole of FIG. Sectional drawing of the cylinder block which follows the F4-F4 line | wire in FIG. Sectional drawing of the oil level gauge insertion hole of the internal combustion engine of the 2nd Embodiment of this invention.

  An oil level gauge insertion hole 1 of an internal combustion engine E according to a first embodiment of the present invention will be described with reference to FIGS. The oil level gauge insertion hole 1 is provided for mounting an oil level gauge for inspecting the amount of oil (oil surface height) in the crank chamber 300. The oil level gauge insertion hole 1 opens in the side wall 101 on the intake side of the cylinder block 100 as shown in FIGS. The cylinder block 100 has an oil drain passage 102 in the side wall 101 that leads from the cylinder head 200 to the crank chamber 300. The oil level gauge insertion hole 1 communicates with the oil dropping passage 102.

  The cylinder block 100 of the present embodiment is a so-called ladder frame type, and as shown in FIGS. 1 and 4, a first plane A (vertical to the center line B of the cylinder and passing through the rotation center line C of the crankshaft ( The upper block 110 and the lower block 120 are divided by a dividing plane. The upper block 110 has a water jacket 103 disposed on the cylinder head side in the side wall 101.

  As shown in FIG. 4, the oil level gauge insertion hole 1 includes a port 11, a through hole 12, and a partition wall 13. 4 is a cross-sectional view in which the cylinder block 100 is cut obliquely along the line F4-F4 in FIG. 3 so as to pass through the oil level gauge insertion hole 1 and the oil dropping passage 102. FIG. The port 11 opens on the side wall 101 of the cylinder block 100.

  In the present embodiment, the port 11 is disposed on the side wall 101 of the upper block 110. More specifically, the port 11 extends along the rotation center line C of the crankshaft with respect to the second plane D perpendicular to the rotation center line C of the crankshaft and passing through the oil dropping passage 102 as shown in FIG. It is arranged at a position deviating in the direction. Further, as shown in FIGS. 2 and 4, the port 11 is disposed at a lower position than the water jacket 103 with respect to the cylinder head 200.

  The through hole 12 allows the port 11 to communicate with the oil dropping passage 102. As shown in FIG. 3 in an enlarged manner, the port 11 is formed so as to protrude adjacent to the outer wall of the portion where the oil dropping passage 102 is disposed. As shown in FIG. 4, the through hole 12 has an angle with respect to the direction along the oil dropping passage 102 and extends obliquely from the port 11 so as to approach the oil dropping passage 102 toward the crank chamber 300. ing.

  As shown in FIG. 4, the partition wall 13 is formed between the through hole 12 and the oil dropping passage 102. The lower end 14 of the partition wall 13 extends to the boundary surface between the upper block 110 and the lower block 120, that is, the first plane A. The through hole 12 and the oil dropping passage 102 merge at the lower block 120 and communicate with the crank chamber 300 as one hole.

  When the oil level gauge G is inserted into the oil level gauge insertion hole 1 of the internal combustion engine E configured as described above, the oil level gauge G is guided by the partition wall 13 as shown in FIG. The tip of the oil level gauge G extends to the crank chamber 300 along the partition wall 13 while being held at a position that does not hinder the oil flowing down the dropping passage 102. Further, the through hole 12 is separated from the oil dropping passage 102 by the partition wall 13 in the upper block 110. Of the oil flowing through the oil drop passage 102, the oil that has fallen along the partition wall 13 is guided by the oil level gauge G and falls into the crank chamber 300. Therefore, even if blow-by gas rises from the crank chamber 300, the oil that has flowed through the oil dropping passage 102 is prevented from rising to the through hole 12.

  Further, since the oil level gauge insertion hole 1 is disposed on the side wall 101 of the cylinder block 100 at a position where it does not overlap with the oil dropping passage 102 or the water jacket 103, the outer dimensions of the cylinder block 100 need not be increased. Further, since the port 11 of the oil level gauge insertion hole 1 is disposed at a position lower than the water jacket 103, the dimension of the internal combustion engine E toward the cylinder head is not bulky. The port 11 may be equipped with a guide tube that extends the oil level gauge G to a position where it can be easily operated. Therefore, since the port 11 of the oil level gauge insertion hole 1 is provided on the side wall 101 of the cylinder block 100, it is easy to set the length of the oil level gauge G itself to a length that is easy to handle.

  An internal combustion engine E according to a second embodiment of the present invention will be described with reference to FIG. In the description of the internal combustion engine E according to the second embodiment, the components having the same functions as those of the internal combustion engine E according to the first embodiment are denoted by the same reference numerals, and the detailed description refers to the description of the first embodiment. I decided to.

  The internal combustion engine E according to the second embodiment is different from the first embodiment in the internal structure relating to the oil level gauge insertion hole 1. FIG. 5 shows a cross-sectional view when the cylinder block 100 is cut at the same position as FIG. 4, which is a cross-sectional view of the oil level gauge insertion hole 1 of the first embodiment. In this embodiment, the through hole 12 is a first plane A perpendicular to the cylinder center line B and passing through the rotation center line C of the crankshaft, that is, a dividing surface between the upper block 110 and the lower block 120 of the cylinder block 100. Therefore, the oil dropping passage 102 is joined at an angle at a position close to the cylinder head 200 side. Further, the through hole 12 may be a hole smaller than the oil dropping passage 102 as long as the hole is large enough to allow the oil level gauge G to pass therethrough.

When the oil level gauge G is inserted into the oil level gauge insertion hole 1 of the internal combustion engine E of the second embodiment configured as described above, the oil level gauge G is located on the side opposite to the partition wall 13. It is bent along the inner surface of 102 and extends to the crank chamber 300. That is, the oil level gauge G does not contact the partition wall 13. Since the through hole 12 is obliquely joined to the oil dropping passage 102, the opening shape with the oil dropping passage 102 is elliptical, and the oil flowing along the partition wall 13 out of the oil flowing down the oil dropping passage 102 is Then, it flows separately at the portion where the through hole 12 and the oil dropping passage 102 merge. Further, even if the blow-by gas drops off the oil flowing into the passage 102, the shape of the opening at the junction of the through hole 12 and the oil dropping passage 102 is elliptical, so that the oil rises into the through hole 12. Can be prevented.
The two embodiments of the oil level gauge insertion hole 1 of the internal combustion engine E according to the present invention have been described above. These embodiments are merely examples for clarity of the invention. Therefore, it is not intended to limit the invention to these embodiments. The present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the paper of the invention. Each above-mentioned embodiment and its modification are included in the range of invention, and those equivalent ranges are included with respect to the invention described in the claim.

  E ... Internal combustion engine, 1 ... Oil level gauge insertion hole, 11 ... Port, 12 ... Through hole, 13 ... Partition wall, 14 ... Lower end, 100 ... Cylinder block, 101 ... Side wall, 102 ... Oil drop passage, 103 ... Water jacket, DESCRIPTION OF SYMBOLS 110 ... Upper block, 120 ... Lower block, 200 ... Cylinder head, A ... 1st plane, B ... Cylinder centerline, C ... (Crankshaft) rotation centerline, D ... 2nd plane.

Claims (5)

An internal combustion engine having an oil level gauge insertion hole into which an oil level gauge is inserted,
The oil level gauge insertion hole is
A port opened on the side wall of the cylinder block having an oil drain passage leading from the cylinder head to the crank chamber;
A through hole communicating the port with the oil drain passage;
E Bei and a partition wall formed between the oil flow passage and the through hole,
The port is arranged so as to be deviated in a direction along the rotation center line with respect to a second plane passing through the oil dropping passage perpendicular to the rotation center line of the crankshaft. Internal combustion engine. The cylinder block is divided into an upper block and a lower block by a first plane perpendicular to the center line of the cylinder and passing through the rotation center line of the crankshaft.
The port is provided on the side wall of the upper block;
The internal combustion engine according to claim 1, wherein the partition wall extends to the first plane. 3. The internal combustion engine according to claim 1, wherein the through-hole has an angle with respect to a direction along the oil dropping passage and approaches the oil dropping passage toward the crank chamber. 4. organ. The cylinder block has a water jacket disposed on the cylinder head side in the side wall,
It said port is an internal combustion engine according to any one of claims 1 to 3, characterized in that it is located away than the water jacket from the cylinder head. The through hole joins the oil dropping passage with an angle at a position close to the cylinder head from a first plane perpendicular to the center line of the cylinder and passing through the rotation center line of the crankshaft. An internal combustion engine according to claim 1.

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