JP3619342B2 - Internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine, and more particularly to an improved structure for inserting an oil level gauge for detecting an oil level in an oil pan.
[0002]
[Prior art]
Conventionally, when inserting an oil level gauge into an oil pan, in a general internal combustion engine, a guide pipe extending upward from the oil pan is attached to the oil pan, and also disclosed in Japanese Patent Publication No. 63-63722. In the engine, an oil level gauge is inserted into a rib extending in the vertical direction and provided on the side wall of the cylinder block.
[0003]
[Problems to be solved by the invention]
However, in the case where a guide pipe is provided as in the conventional case, not only the number of parts is increased, but also the number of mounting work steps is increased. In the case disclosed in the above Japanese Patent Publication No. 63-63722, an oil level gauge is provided. Not only does the structure of the hole to be inserted become complicated, but a drilling process for drilling the rib is required, resulting in an increase in the number of processing steps. In addition, because the intake manifold or exhaust manifold is located on the side of the cylinder block, it is necessary to attach and detach the oil level gauge while avoiding the intake manifold or exhaust manifold. I want.
[0004]
The present invention has been made in view of such circumstances, and provides an internal combustion engine capable of reducing the number of parts and man-hours and improving workability in attaching and detaching an oil level gauge. Objective.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided an engine including a power transmission means provided between one end of a crankshaft and a rotating member, and including an oil pan on one end along the axis of the crankshaft. In an internal combustion engine in which a cover covering the power transmission means is fastened to a coupling surface provided in the main body, an insertion port for inserting an oil level gauge for detecting the oil level in the oil pan is provided in the cover, A guide wall for guiding an oil level gauge inserted between the cover and the engine body from the mouth is integrally formed.
[0006]
According to such a configuration, since the guide wall can be formed at the time of forming the cover, post-processing such as drilling is not required, and the number of processing steps can be reduced, and the cover is along the axis of the crankshaft. By being connected to the engine body at one end, the intake manifold or exhaust manifold arranged on the side of the engine body will not interfere with the insertion of the oil level gauge. Workability can be improved. In addition, the guide pipe for guiding the oil level gauge is not required, and the insertion opening of the oil level gauge can be set at a relatively high position, so that the number of parts can be reduced.
[0007]
According to the invention of claim 2, in addition to the configuration of the invention of claim 1, the guide wall is formed along a plane orthogonal to the coupling surface of the engine body, and the cover By being brought into contact with the engine main body so as to form a guide hole with a closed cross section between the cover and the engine main body in a state of being coupled to the coupling surface, it is possible to increase the rigidity of the cover by the guide wall and perform drilling processing. It is possible to form the guide hole without any problem.
[0008]
According to the invention described in claim 3, in addition to the configuration of the invention described in claim 2 above, the cover is integrally provided with the sensor mounting portion recessed on the outer surface side, and a part of the peripheral wall of the sensor mounting portion. Is constituted by the guide wall, it is possible to increase the rigidity of the sensor mounting portion by the guide wall, thereby improving the detection performance of the sensor attached to the sensor mounting portion.
[0009]
According to a fourth aspect of the invention, in addition to the configuration of the second or third aspect of the invention, a rib that contacts the guide wall is provided integrally with the engine body, and an oil return passage or a blow-by gas passage is provided. Is formed in the engine body along the rib, so that it is possible to reinforce the portion that forms the oil return passage or the blow-by gas passage by the rib, and therefore the passage area of the oil return passage or the blow-by gas passage is compared. It is possible to ensure a smooth flow of oil and blow-by gas.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0011]
1 to 7 show an embodiment of the present invention. FIG. 1 is a partially broken front view of the internal combustion engine, and FIG. 2 is a partially broken view of the internal combustion engine as viewed from the direction of line 2-2 in FIG. 3 is a perspective view of the oil pan, FIG. 4 is an enlarged view taken along arrow 4 in FIG. 2, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, and FIG. FIG. 7 is a perspective view of the cover as viewed from the outer surface side.
[0012]
1 and 2, an engine body E of an in-line four-cylinder internal combustion engine includes a cylinder block 12, a cylinder head 13 coupled to the upper surface of the cylinder block 12 via a gasket, and a lower surface of the cylinder block 12. It is comprised with the oil pan 14 couple | bonded through a gasket.
[0013]
The cylinder block 12 is provided with four cylinder bores 15 arranged in series, and pistons 16 are slidably fitted to the cylinder bores 15. A crank journal 18a of the crankshaft 18 is rotatably supported between the cylinder block 12 and a plurality of bearing caps 17 provided integrally with the oil pan 14, and each piston 16 is connected to a connecting rod. Are connected to the crankshaft 18 via 19.
[0014]
A camshaft 20 as a first rotating member is rotatably supported on the cylinder head 13 with an axis parallel to the crankshaft 18. One end of the camshaft 20 and the crankshaft 18 Between one end portion, a drive sprocket 21 fixed to the crankshaft 18, a driven sprocket 22 fixed to the camshaft 20, and an endless timing chain 23 wound around both sprockets 21 and 22 are configured. The first power transmission means 24 is provided, and the rotation of the crankshaft 18 is transmitted to the camshaft 20 by the power transmission means 24 at a reduction ratio of 1/2. An oil pump 25 having an input shaft 25a, which is a second rotating member, is housed and arranged in the oil pan 14, and is fixed to the crankshaft 18 between one end of the crankshaft 18 and the input shaft 25a. A second power transmission means 29 comprising a drive sprocket 26, a driven sprocket 27 fixed to the input shaft 25a, and an endless chain 28 wound around both the sprockets 26, 27 is provided. Is transmitted to the oil pump 25 through the power transmission means 29.
[0015]
Combustion chambers 31 are respectively formed between the cylinder head 13 and the tops of the pistons 16 that are slidably fitted to the cylinder bores 15. The cylinder head 13 is provided with intake ports 33 and exhaust ports 34 corresponding to the combustion chambers 31, respectively. An intake manifold 35 connected to the intake ports 33 is provided on one side surface of the cylinder head 13. Are connected, and an exhaust manifold 36 connected to each exhaust port 34 is connected to the other side surface of the cylinder head 13.
[0016]
Each combustion chamber 31... And each intake port 33... Can be switched between communicating and blocking, and a pair of intake valves 41... Disposed in each combustion chamber 31..., Each combustion chamber 31. A conventionally known valve operating mechanism 43 is provided between the intake shafts 42 arranged in pairs for each of the combustion chambers 31 so as to be able to switch between communication and interruption between the cam shafts 20. The head cover 44 is coupled to the upper surface of the cylinder head 13 so as to cover the valve mechanism 43.
[0017]
A cover 45 covering most of the power transmission means 24 and all of the power transmission means 29 is coupled to the cylinder block 12 and the oil pan 14, and an upper end portion of the cover 45 is a part of the power transmission means 24. And is fastened to a case portion 46 provided integrally with the cylinder head 13.
[0018]
In FIG. 3, the oil pan 14 is formed in a shape in which one end side of the crankshaft 18 is opened and fastened to the lower surface of the cylinder block 12. The oil pan 14 is connected to the axis of the crankshaft 18. The bearing caps 17... Configured as vertical wall bodies are integrally provided with an interval in the axial direction of the crankshaft 18. In addition, the upper surface of each bearing cap 17 ... cooperates with a semicircular bearing upper half 47 ... provided in the lower part of the cylinder block 12 to rotatably support the crank journal 18a ... of the crankshaft 18. Semi-circular bearing lower half portions 48 are formed for the purpose.
[0019]
4 to 7 together, a flat coupling surface 50 that is flush with the open end of the oil pan 14 and the cylinder block 12 is provided on one end side along the axial direction of the crankshaft 18. On the other hand, a side wall 52 having a flat coupling surface 51 facing the coupling surface 50 of the oil pan 14 and the cylinder block 12 is provided on the outer edge of the cover 45, and the coupling surfaces 50, 51 sandwiching the seal member 53. Are fastened to each other by a plurality of bolts 54.
[0020]
The cover 45 is provided with an insertion hole 55 for projecting one end of the crankshaft 18 in an airtight and rotatable manner, and a pulley 56 is fixed to the end of the crankshaft 18 projecting from the cover 45 by a bolt 57. An endless belt 58 is wound around the pulley 56. The pulley 56 and the belt 58 transmit power from the crankshaft 18 to the water pump 59 and the like. The housing of the water pump 59 includes a housing portion 60 provided on the upper portion of the cover 45, and the cover 45. And the cylinder block 12 to be fastened.
[0021]
The cover 45 is integrally provided with a cylindrical portion 61 that slightly extends obliquely upward from an intermediate position in the vertical direction of a portion of the side wall 52 on the intake manifold 35 side, and an insertion port 62 is coaxially provided in the cylindrical portion 61. Provided. The rear end of a flexible oil level gauge 64 is fixed to the front end of a support member 63 whose front end can be oil-tightly fitted into the insertion port 62, and the oil level gauge 64 is connected to the oil pan 14. In order to detect the oil level L inside, it is inserted from the insertion port 62 between the cylinder block 12 and the oil pan 14 and the cover 45.
[0022]
A guide wall 65 that guides the oil level gauge 64 inserted from the insertion port 62 so as to slide the tip of the oil level gauge 64 is formed integrally with the cover 45. 14 and a plane perpendicular to the coupling surface 50 of the cylinder block 12, and is arranged extending vertically in a position spaced from the inner side of the side wall 52. Moreover, the lower end of the guide wall 65 is relatively distant from the oil passage L in order to prevent oil from adhering to the guide wall 65 in a relatively large amount and inaccurate detection of the oil level L by the oil level gauge 64. Set to a distant upper position.
[0023]
On the other hand, the cylinder block 12 and the oil pan 14 are integrally provided with a rib 66 that protrudes toward the cover 45 at a position spaced inward from the coupling surface 50 and that contacts the guide wall 65 extending vertically. When the cover 45 is fastened to the cylinder block 12 and the oil pan 14, a part of the side surface is constituted by the guide wall 65 and the rib 66 between the cylinder block 12 and the oil pan 14 and the cover 45. A guide hole 67 having a closed cross section is formed, and the oil level gauge 64 is inserted into the guide hole 67.
[0024]
In addition, the oil pan 14 is formed with an oil return passage 68 for returning the oil flowing down from the cylinder block 12 side to the oil pan 14 so as to extend vertically along the rib 66.
[0025]
A plurality of protrusions 69 projecting toward the cover 45 are integrally provided at equal intervals in the circumferential direction on the pulley 56 fixed to the end portion of the crankshaft 18 projecting from the cover 45. A crank angle sensor 70 that detects 69... And detects the crank angle of the crankshaft 18 is attached to a sensor attachment portion 71 provided on the outer surface side of the cover 45. The sensor mounting portion 71 is formed to be recessed on the outer surface side of the cover 45 so that the guide wall 65 provided integrally with the cover 45 is a part of the peripheral wall, and is integrated with the sensor mounting portion 71. A crank angle sensor 70 is attached to a pair of bosses 72, 73 provided on.
[0026]
Next, the operation of this embodiment will be described. The power transmission means 24 and 29 provided between one end of the crankshaft 18 and the camshaft 20 and the input shaft 25a of the oil pump 25 are covered. The cover 45 fastened to the cylinder block 12 and the oil pan 14 of the engine body E is provided with an insertion port 62 into which the oil level gauge 64 is inserted, and a guide wall for guiding the oil level gauge 64 inserted from the insertion port 62. Since 65 is integrally formed, the guide pipe for guiding the oil level gauge 64 is not required, and the insertion port 62 of the oil level gauge 64 can be set at a relatively high position of the engine body E. Reduction can be achieved. Moreover, since the guide wall 65 can be integrally formed when the cover 45 is formed, post-processing such as drilling after forming the cover 45 is not required, and the number of processing steps can be reduced. Further, the cover 45 is fastened to the cylinder block 12 and the oil pan 14 on one end side along the axis of the crankshaft 18, so that the intake manifold 35 or the exhaust manifold 36 disposed on the side of the engine body E is oiled. The insertion of the level gauge 64 does not get in the way, and the workability in attaching / detaching the oil level gauge 64 can be improved.
[0027]
Further, since the guide wall 65 is formed along a plane orthogonal to the coupling surface 50 of the cylinder block 12 and the oil pan 14, the rigidity of the cover 45 can be increased by the guide wall 65. Moreover, the ribs 66 provided on the cylinder block 12 and the oil pan 14 come into contact with the guide wall 65 in a state where the cover 45 is coupled to the coupling surface 50, so that the cylinder block 12, the oil pan 14, and the cover 45 Since the guide hole 67 having a closed cross section is formed, the guide hole 67 can be formed without drilling, and the oil level gauge 64 is reliably guided to the oil level L by the guide hole 67. be able to. On the other hand, assuming that the oil level gauge 64 is guided only by the guide wall 65, the guide wall 65 is directed toward the distal end side because the guide wall 65 is integrally formed by molding the cover 45. Accordingly, the oil level gauge 64 may be disengaged from the guide wall 65.
[0028]
In addition, the sensor mounting portion 71 that is recessed on the outer surface side of the cover 45 is provided integrally with the cover 45, and a part of the guide wall 65 is configured as a part of the peripheral wall of the sensor mounting portion 71. The rigidity of the portion 71 can be increased, thereby improving the detection performance of the crank angle sensor 70 attached to the sensor attachment portion 71.
[0029]
Further, an oil return passage 68 is formed in the oil pan 14 along the rib 66 provided in the cylinder block 12 and the oil pan 14 and contacting the guide wall 65. For this reason, it is possible to reinforce the portion forming the oil return passage 68 in the oil pan 14 by the rib 66, and therefore, the passage area of the oil return passage 68 can be set relatively large. A smooth flow of oil at 68 can be guaranteed.
[0030]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0031]
For example, in the above-described embodiment, the internal combustion engine in which the bearing caps 17 are integrally provided in the oil pan 14 has been described. However, the present invention is not limited to such an example. Further, the present invention can be applied to an internal combustion engine in which a blow-by gas passage along the rib 66 is formed in the engine body E instead of the oil return passage 68.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, post-processing such as drilling is not required for the cover, so that the number of processing steps can be reduced, and the intake manifold or the exhaust manifold becomes an obstacle when inserting the oil level gauge. It is possible to improve the workability when attaching and detaching the oil level gauge, eliminating the need for a guide pipe for guiding the oil level gauge, and setting the oil level gauge insertion port at a relatively high position. If possible, the number of parts can be reduced.
[0033]
According to the second aspect of the present invention, it is possible to increase the rigidity of the cover by the guide wall, and it is possible to reliably guide the oil level gauge to the oil level by forming the guide hole without drilling. .
[0034]
According to the third aspect of the present invention, the guide wall can increase the rigidity of the sensor mounting portion and improve the detection performance of the sensor mounted on the sensor mounting portion.
[0035]
Furthermore, according to the invention of claim 4, the portion that forms the oil return passage or the blow-by gas passage is reinforced by the rib, and the passage area of the oil return passage or the blow-by gas passage can be set relatively large. Smooth flow of oil and blow-by gas can be guaranteed.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of an internal combustion engine.
FIG. 2 is a partially cutaway side view of the internal combustion engine as viewed from the direction of line 2-2 in FIG.
FIG. 3 is a perspective view of an oil pan.
4 is an enlarged view taken along arrow 4 in FIG. 2;
5 is a cross-sectional view taken along line 5-5 of FIG.
FIG. 6 is a front view of the cover as viewed from the inner surface side.
FIG. 7 is a perspective view of the cover as viewed from the outer surface side thereof.
[Explanation of symbols]
14 ... oil pan 18 ... crankshaft 20 ... camshafts 24, 29 as rotating members ... power transmission means 25a ... input shaft 45 as rotating member ... cover 50 ... Coupling surface 62 ... insertion port 64 ... oil level gauge 65 ... guide wall 66 ... rib 67 ... guide hole 68 ... oil return passage 70 ... crank angle sensor 71 ... Sensor mounting part E ... Engine body L ... Oil level

Claims (4)

Power transmission means (24, 29) is provided between one end of the crankshaft (18) and the rotating member (20, 25a), and an oil pan (14) is provided at one end along the axis of the crankshaft (18). In an internal combustion engine in which a cover (45) covering the power transmission means (24, 29) is fastened to a coupling surface (50) provided in an engine body (E) including the oil pan ( 14) An insertion port (62) for inserting an oil level gauge (64) for detecting the oil level (L) in the inside is provided, and is inserted between the cover (45) and the engine body (E) from the insertion port (62). An internal combustion engine in which a guide wall (65) for guiding an oil level gauge (64) is integrally formed. The guide wall (65) is formed along a plane perpendicular to the coupling surface (50) of the engine body (E), and the cover (45) is coupled to the coupling surface (50) in the state of being coupled to the cover (45). 45. The internal combustion engine according to claim 1, wherein the engine body (E) is brought into contact with the engine body (E) so as to form a guide hole (67) having a closed cross section between the engine body (45) and the engine body (E). The cover (45) is integrally provided with a sensor mounting portion (71) recessed on the outer surface side, and a part of the peripheral wall of the sensor mounting portion (71) is constituted by the guide wall (65). The internal combustion engine according to claim 2. The engine body (E) is integrally provided with a rib (66) that contacts the guide wall (65), and an oil return passage (68) or a blow-by gas passage extends along the rib (66). The internal combustion engine according to claim 2, wherein the internal combustion engine is formed as follows.

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