JP7244194B2 - internal combustion engine - Google Patents

Description

The present invention relates to an internal combustion engine and is characterized by oil level detection means.

2. Description of the Related Art In an internal combustion engine, an elongated oil level gauge is used as a means for detecting the amount of oil accumulated in an oil pan, and the oil level is detected from the wetness of the gauge. The arrangement of the oil level gauge is broadly classified into a mode in which gauge insertion holes are formed in the cylinder head and the cylinder block, and a mode in which a guide pipe is provided outside the cylinder head and the cylinder block and is inserted through the guide pipe. be done.

In addition, the use of the guide pipe raises the problem that the cost increases and that the design is troublesome because consideration must be given so that the guide pipe does not interfere with other members. On the other hand, if gauge insertion holes are formed in the cylinder head and cylinder block, not only can the cost be reduced, but interference with other members will not occur, which has the advantage of improving the freedom of design, and the fuel efficiency can be reduced by reducing the weight. There is an advantage that it can also contribute to the improvement of

The mode of forming the gauge insertion holes in the cylinder head and cylinder block has the above advantages. There is a problem that a phenomenon occurs in which a small amount of contact is generated, causing noise and wear.

Regarding this point, for example, as disclosed in Patent Document 1, by bending the oil level gauge in advance and stretching the oil level gauge against the inner surface of the gauge insertion hole, the wobbling movement can be prevented. It is In Patent Document 1, the tip portion of the oil level gauge is bent in a V shape, but it is also bent in a chevron shape or an S shape.

JP 2016-14377 A

In the embodiment in which the gauge insertion holes are formed in the cylinder head and the cylinder block, it is possible to prevent wobbling by bending the oil level gauge as in Patent Document 1, but the oil level gauge is manufactured using a straight plate material. Therefore, there is a problem that the bending work is required and the cost increases accordingly. In addition, since the bent portion is provided at the tip, there is a problem in that resistance is generated over a long range during insertion and removal.

An object of the present invention is to provide an improved structure in terms of cost and the like in a type in which gauge insertion holes are formed in a cylinder head and a cylinder block.

The claimed invention is
"A gauge insertion hole through which an oil level gauge can be freely inserted and removed is formed in one side of the cylinder head and one side of the cylinder block in a state of communicating with each other, and the oil level gauge resists elasticity. While being bendable and being straight when pulled out from the gauge insertion hole ,
The gauge insertion hole is non-linear so that it bends and deforms against elasticity when the oil level gauge is fully inserted.”
In the configuration
"The gauge insertion hole includes a first gauge insertion hole whose upper end is open above the cylinder head, a third gauge insertion hole whose lower end is opened toward the oil pan, the first gauge insertion hole and the third gauge insertion hole. a second gauge insertion hole located between the insertion holes,
The first gauge insertion hole and the third gauge insertion hole are parallel to each other when viewed from the crankshaft line direction, and are offset so that the first gauge insertion hole is located outside, and the second gauge insertion hole is: inclined with respect to both the first gauge insertion hole and the third gauge insertion hole when viewed from the crank axial direction,
In addition, the oil level gauge is arranged so that its base is shifted inside the cylinder head from the axis of the first gauge insertion hole."
It has the characteristics of

In the present invention, a straight oil level gauge is used, and since the gauge insertion hole is not straight and has two bent portions , it resists elasticity when inserted into the gauge insertion hole. It bends and deforms to push against the inner surface of the gauge insertion hole. As a result, it is possible to prevent noise by eliminating shaking motion due to vibration or the like. Also, since there is no vibration, no wear occurs.

In the present invention, since the oil level gauge does not need to be bent, the cost can be reduced, and the gauge insertion holes of the cylinder head and cylinder block can be formed by casting or die casting. Therefore, it is possible to prevent the cost of the gauge insertion hole from increasing.

Therefore, according to the present invention, by forming gauge insertion holes in the cylinder head and the cylinder block, an oil level detection structure that has advantages such as improved fuel consumption due to cost reduction and weight reduction and improved design freedom can be improved. It can be provided in a state where the cost is suppressed to the state where it is not.

In addition, since the oil level gauge gradually begins to bend when it is inserted into the gauge insertion hole, and bends completely when it is completely inserted, the resistance gradually increases when inserted and gradually decreases when removed. Therefore, compared with the case where the oil level gauge is bent, there is also the advantage that the insertion/removal resistance can be reduced and the insertion/removal can be performed with a light force.

It is a diagram showing an embodiment, (A) is a vertical front view, (B) is a cross-sectional view taken along the line BB of (A), (C) is a vertical front view with the knob part separated, (D) is a ( C) is a DD view, and (E) is an EE view of (C). It is a vertical front view of the 1st reference drawing . It is a vertical front view of the 2nd reference drawing .

(1). First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. The internal combustion engine of the present embodiment is for vehicle use, and is placed horizontally in the engine room with the crankshaft extending in the vehicle width direction. In addition, the exhaust side faces forward, and the cylinder axis is tilted slightly forward.

The internal combustion engine includes, as an engine body, a cylinder block 1, a cylinder head 2 fixed to the upper surface of the cylinder block 1, a head cover 3 fixed to the upper surface of the cylinder head 2, and an oil pan 4 fixed to the lower surface of the cylinder block 1. .

As oil level detection means for the oil pan 4, a first gauge insertion hole 5 positioned above and a second gauge insertion hole 6 positioned below are formed in one side portion of the cylinder head 2 on the exhaust side. On the other hand, the cylinder block 1 is formed with a third gauge insertion hole 7 communicating with the second gauge insertion hole 6 . Therefore, the three gauge insertion holes 5 to 7 are used as a unit insertion hole to form one overall gauge insertion hole 8 as a whole. Each gauge insertion hole 5-7 has a circular cross-sectional shape.

The oil level gauge 9 is composed of a metal band plate 10 which is straight when no external force is applied, and a knob 11 fixed to the upper end thereof. It has a boss portion 11b to be fitted into a mounting hole 12 formed in the head cover 3, and a flange 11c provided on the boss portion 11b. Although not shown, a portion of the strip 10 that is wet with oil is marked with a scale.

The oil level gauge 9 is inserted into and removed from the gauge insertion holes 5 to 7 with the wide surface of the band plate 10 parallel to the exhaust side surfaces of the cylinder head 2 and the cylinder block 1 . That is, the posture of the oil level gauge 9 is determined when it is inserted into and removed from the gauge insertion holes 5-7.

Therefore, by providing the boss portion 11b with a positioning projection 14 protruding in the direction of the wide surface of the band plate 10, and forming a positioning groove 15 in which the positioning projection 14 is fitted in the mounting hole 12 of the cylinder head 2, a certain It is set so that it can be inserted into and removed from the gauge insertion holes 5 to 7 only in a posture. The finger hook portion 11a is formed so as to expand along a plane parallel to the wide surface of the band plate 10, but changing the posture by 90 degrees may make it easier to insert and remove the finger.

A state in which the boss portion 11b of the oil level gauge 9 is fitted in the mounting hole 12 and no external force acts on the band plate 10 is defined as a reference posture, and this state is indicated by a dotted line in FIG. 1(A). First, the first gauge insertion hole 5 is parallel (concentric) to the strip plate 10 in the reference posture and orthogonal to the upper and lower surfaces of the cylinder head 2 .

On the other hand, the upper end of the second gauge insertion hole 6 communicates with the first gauge insertion hole 5, but the lower end is inclined so as to deviate toward the intake side. Therefore, the lower end of the second gauge insertion hole 6 is offset to the suction side with respect to the axial center of the first gauge insertion hole 5, but the amount of offset is approximately the same as the inner diameters of both gauge insertion holes 5 and 6. are set to the dimensions of

The third gauge insertion hole 7 is parallel to the reference posture of the band plate 10, perpendicular to the upper surface of the cylinder block 1, and concentric with the lower end of the second gauge insertion hole 6. Therefore, the third gauge through-hole 7 is parallel to the first gauge through-hole 5 and is offset from the first gauge through-hole 5 by the same dimension as the inner diameter thereof.

The cylinder head 2 is a cast aluminum product, and the first gauge insertion hole 5 and the second gauge insertion hole 6 are formed using a core during casting. On the other hand, the cylinder block 1 is an aluminum die-cast product, and the third gauge insertion hole 7 is formed during die-casting using a slide pin.

In this embodiment, the second gauge insertion hole 6 is inclined with respect to the first gauge insertion hole 5, and the third gauge insertion hole 7 is inclined with respect to the first gauge insertion hole 5. By offsetting the insertion hole 7 from the first gauge insertion hole 5 toward the suction side, the overall gauge insertion hole 8 consisting of the three gauge insertion holes 5 to 7 is non-linear.

Since the overall gauge insertion hole 8 is bent at two points, the band plate 10 is bent by coming into contact with the connecting portion between the second gauge insertion hole 6 and the third gauge insertion hole 7, and the lower portion is the third gauge insertion hole. It elastically abuts against the lower edge of the gauge insertion hole 7 . This prevents the belt plate 10 from wobbling. Therefore, it is possible to prevent the band plate 10 from bumping against the lower end edge of the third gauge insertion hole 7 in small increments, and to prevent the band plate 10 from being worn.

As described above, while the gauge insertion holes 5 to 7 are formed in the cylinder head 2 and the cylinder block 1 in advance, the band plate 10 does not need to be bent, so the cost does not increase. In addition, since the strip 10 begins to deform after being inserted for a considerable amount of time, the insertion/removal resistance is small, and the insertion/removal can be performed with a light force. As shown in FIG. 1(B), since the longitudinal edges of the band plate 10 are in contact with the inner surfaces of the gauge insertion holes 5 to 7, the visibility of the wetness of the oil is not deteriorated.
As shown in FIG. 1A, with the boss 11b of the band plate 10 inserted into the mounting hole 12, the root (upper end) of the band plate 10 is positioned closer to the cylinder head 2 than the axis of the first gauge insertion hole 5. (the axis of the mounting hole 12 is shifted toward the inside of the cylinder head 2 than the axis of the first gauge insertion hole 5).

(2) .Reference example
In the first reference example shown in FIG. 2, the cylinder head 2 is formed with a first gauge insertion hole 5 parallel to the band plate 10 in the standard posture over the entire height. On the other hand, the cylinder block 1 is formed with a third gauge insertion hole 7 parallel to the band plate 10 in the standard posture and offset from the first gauge insertion hole 5 toward the intake side surface. A large diameter portion 7 a communicating with the first gauge insertion hole 5 is formed at the upper end of the 3 gauge insertion hole 7 . Therefore, also in this reference example , the overall gauge insertion hole 8 is non-linear.

In this reference example , the strip plate 10 is bent at a mid-height portion of the third gauge insertion hole 7, and a portion below the bent portion elastically contacts the inner surface of the third gauge insertion hole 7. Therefore, it is possible to eliminate vibration and prevent noise. In this reference example , since only the first gauge insertion hole 5 needs to be formed in the cylinder head 2, the core can be simplified. The large diameter portion 7a of the third gauge insertion hole 7 can also be formed by drilling.

In the second reference example shown in FIG. 3, a first gauge insertion hole 5 and a second gauge insertion hole 6 are formed in the cylinder head 2 in parallel with the band plate 10 in the standard posture. The third gauge insertion hole 7 of the cylinder block 1 is connected to the second gauge insertion hole 6 by the inclined portion 16 , while the third gauge insertion hole 7 of the cylinder block 1 is connected to the first gauge insertion hole 5 in parallel with the strip plate 10 in the reference posture. It is formed in a state of being brought to the side of Therefore, also in this embodiment, the upper end portion of the third gauge insertion hole 7 is formed with a tapered large diameter portion 7a.

In this reference example , the band plate 10 is bent at the upper end portion of the third gauge insertion hole 7 and then contacts the third gauge insertion hole 7 over its entire length. When the amount of offset of the second gauge insertion hole 6 with respect to the first gauge insertion hole 5 is increased, the band plate 10 is bent at two locations, the upper portion of the second gauge insertion hole 6 and the upper portion of the third gauge insertion hole 7. It hits the lower edge of the third gauge insertion hole 7 .

In FIGS. 2 and 3, the strip plate 10 is shown overlapping the inner surface of the third gauge insertion hole 7 below the bent portion. A gap is provided between the plate 10 and the inner surface of the third gauge insertion hole 7. - 特許庁In the present embodiment and the reference example , since the posture of the band plate 10 is constant, the posture of the finger hook portion 11a of the knob 11 is also constant. Since it is parallel to the side surface, the posture of the finger hook portion 11a is uniform and the appearance is good.

Although the embodiments of the present invention have been described above, the present invention can be embodied in various other ways. For example, each gauge insertion hole of the cylinder block can be formed with a smaller diameter than each gauge insertion hole of the cylinder head. Also, the oil level gauge knob can be attached to the cylinder head.

The present invention can be embodied in an oil level detection structure for an internal combustion engine. Therefore, it can be used industrially.

1 Cylinder block 2 Cylinder head 3 Head cover 4 Oil pan 5 First gauge insertion hole 6 Second gauge insertion hole 7 Third gauge insertion hole 8 Overall gauge insertion hole 9 Oil level gauge 10 Band plate 11 Knob

Claims (1)

A gauge insertion hole through which an oil level gauge can be freely inserted and removed is formed in one side of the cylinder head and one side of the cylinder block in a state of communicating with each other,
The oil level gauge is bendable and deformable against elasticity, and is straight when pulled out from the gauge insertion hole ,
The gauge insertion hole is configured to be nonlinear so as to bend and deform against elasticity when the oil level gauge is fully inserted,
The gauge insertion holes include a first gauge insertion hole whose upper end is open above the cylinder head, a third gauge insertion hole whose lower end is opened toward the oil pan, and the first gauge insertion hole and the third gauge insertion hole. and a second gauge insertion hole positioned between the hole,
The first gauge insertion hole and the third gauge insertion hole are parallel to each other when viewed from the crankshaft line direction, and are offset so that the first gauge insertion hole is located outside, and the second gauge insertion hole is: inclined with respect to both the first gauge insertion hole and the third gauge insertion hole when viewed from the crank axial direction,
Further, the oil level gauge is arranged such that its base is shifted toward the inside of the cylinder head from the axis of the first gauge insertion hole.
internal combustion engine.

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