JP2517942Y2 - Engine reinforcement structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a reinforcing structure for an engine in which a cylinder block reinforcing member is attached to a lower surface side of a cylinder block to thereby reinforce the lower portion of the cylinder block. Is.

(Prior Art) In a conventional engine, from the viewpoint of increasing the rigidity of the lower portion of the cylinder block, a cylinder block reinforcing member is attached to the lower surface side of the cylinder block so as to cover the entire area of the cylinder block, and There is also known one in which the oil pan is fixed to the lower surface of the member (see, for example, JP-A-63-61757).

Further, in an engine including the cylinder block reinforcing member as described above, it is general that the oil pan is provided so as to cover the entire lower surface of the cylinder block (that is, the entire lower surface of the cylinder block reinforcing member). In order to prevent interference between the oil pan and other members arranged on the lower side of the engine, the oil pan is also provided only on a part of the lower surface of the cylinder block (for example, see the above-mentioned known example).

(Problems to be solved by the invention) By the way, the cylinder block reinforcing member is attached to the lower surface side of the cylinder block so as to substantially cover the lower surface, and the lower surface side of the cylinder block reinforcing member is partially covered. In the case where the oil pan is thus attached, the oil returned to the oil pan side from the valve operating system or the like at the upper part of the engine is not limited to the part corresponding to the oil pan of the bottom wall part of the cylinder block reinforcing member, Pour into the part that does not correspond to the oil pan. Then, the entire amount of the oil that has flowed down to the portion not corresponding to the oil pan flows through the bottom wall portion, moves to the oil pan side, and is returned to the oil pan side from the oil return hole formed in the bottom wall portion. .

In this case, an oil return hole with a relatively large opening area is required to improve the oil return performance.
The larger the opening area, the lower the rigidity of the cylinder block reinforcing member itself. On the other hand, in the oil return form as described above, during sudden braking, sudden turning, etc., oil flows from the portion not corresponding to the oil pan through the oil return hole to the portion corresponding to the oil pan, resulting in poor oil return performance. It is possible that

In view of this, the present invention proposes a reinforcing structure for an engine that achieves both the rigidity of the cylinder block reinforcing member and the oil return property.

(Means for Solving the Problem) In the present invention, the following configuration is adopted as a specific means for solving the problem.

In the invention according to claim 1 of the present application, a cylinder having, on the lower surface side of the cylinder block, a peripheral wall substantially conforming to the outer peripheral shape of the lower surface of the cylinder block, and a bottom wall provided so as to substantially cover the inside of the peripheral wall. The block reinforcing member is tightened and fixed with the upper surface of the cylinder block reinforcing member abutting against the lower surface of the cylinder block, and the lower surface of the cylinder block reinforcing member covers a part of the lower surface of the cylinder block reinforcing member. In this way, the oil pan is attached, and the portion of the bottom wall of the cylinder block reinforcing member located at the end of the oil pan of the first bottom wall portion corresponding to the oil pan does not correspond to the oil pan. Oil return hole for returning the oil that has dropped from the cylinder block side to the second bottom wall side to the oil pan side In addition to forming the oil return hole, the oil return hole has a major axis in a direction substantially orthogonal to the flow-down direction of the oil flowing from the second bottom wall portion toward the first bottom wall portion along the second bottom wall portion. The second hole of the pair of edge portions in the minor axis direction of the oil return hole is used as the second hole.
It is characterized in that a weir-shaped oil regulating rib protruding upward from the bottom wall portion is provided at an edge portion located on the side opposite to the bottom wall portion.

According to a second aspect of the present invention, in the engine reinforcing structure according to the first aspect, the shape of the bottom wall corresponding to the oil pan is a curve that gradually descends from the widthwise central portion toward both side portions. It is characterized by being formed in a plate shape.

(Operation) With the configuration of the present invention, the following operation can be obtained.

According to the engine reinforcing structure of the first aspect of the present invention, in the portion of the bottom wall of the cylinder block reinforcing member that is located at the end of the oil pan of the first bottom wall portion corresponding to the oil pan, An oil return hole for returning the oil dropped from the cylinder block side to the oil pan side is formed on the second bottom wall portion side that does not correspond to the oil pan, and the shape of the oil return hole is set to the second bottom wall portion side. A long hole having a major axis in a direction substantially orthogonal to the flow-down direction of the oil flowing from the second bottom wall to the first bottom wall, and a pair of edges of the oil return hole in the minor axis direction. Since a dam-like oil regulating rib protruding upward from the bottom wall portion is provided at an edge portion of the portion located on the opposite side of the second bottom wall portion, the second bottom wall portion of the bottom wall is provided. Drop from the cylinder block side Reached oil with is returned from the oil return hole flows down to the oil return hole side along the second bottom wall portion smoothly to the oil pan side,
Even if the oil pan on the side of the second bottom wall suddenly jumps out to the side of the oil return hole due to the sudden braking or turning of the vehicle, the oil will reach the edge on the side opposite to the second bottom wall of the oil return hole. Movement of the oil pan toward the center side of the oil pan is restricted by the provided oil restriction rib, and the oil is returned smoothly from the oil return hole to the oil pan side, and a high oil return property is ensured by a synergistic effect of both of them.

Further, there is concern that the rigidity of the cylinder block reinforcing member may be reduced by making the oil return hole an elongated hole and increasing the opening area thereof. However, such a decrease in rigidity is caused by the oil regulating ribs provided at the edge of the oil return hole. The rigidity of the cylinder block is offset by the rigidity of the cylinder block, and the deterioration of the rigidity of the cylinder block reinforcing member is prevented as much as possible even though the oil return hole is a long hole having a large opening area.

In the reinforcement structure for an engine according to claim 2, in addition to the above-described effects being obtained, the shape of the bottom wall corresponding to the oil pan gradually descends from the widthwise central portion toward both side portions. With the curved plate shape, the oil flowing down to the bottom wall portion corresponding to the oil pan smoothly flows down to both sides of the bottom wall due to the inclination of the bottom wall, and a good oil return property is secured.

(Effect of the Invention) Therefore, according to the engine reinforcing structure of the present invention, the cylinder block reinforcing member can be provided with an extremely simple structure in which the oil regulating ribs are simply provided without significantly changing the shape of the cylinder block reinforcing member itself. It is possible to achieve both the securing of rigidity and the improvement of oil return.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a cylinder block reinforcing member 1 to which an engine reinforcing structure according to an embodiment of the present invention is applied. This cylinder block reinforcing member 1 is a V-shaped 6
It is attached to a lower end surface 2a of a cylinder block 2 of a cylinder engine so as to cover the entire area thereof (see FIGS. 2 and 3), and the lower end surface of the cylinder block 2a.
A peripheral wall 11 having a predetermined height is provided so as to circulate in a substantially rectangular shape along the outer shape of 2a.

Then, the upper surface 1a of the cylinder block reinforcing member 1
Are block fastening surfaces 51 that are formed of the upper surface 11a of the peripheral wall 11 and that have block mounting bosses 17, 17, ... Formed at predetermined intervals in the circumferential direction. Further, the lower surface 1b of the cylinder block reinforcing member 1 is provided with the lower surface 11b of the peripheral wall 11.
An oil pan fastening surface 52 is formed by utilizing a part of the block fastening surface 51 and has a rectangular shape narrower than the block fastening surface 51. The oil pan 3 is attached to the block fastening surface 51. Therefore, the oil pan 3 is provided only on a part of the lower surface of the cylinder block reinforcing member 1.

Further, a bottom wall 13 is provided inside the peripheral wall 11 so as to cover the entire area thereof. As shown in FIGS. 2 and 3, the bottom wall 13 has a portion corresponding to the oil pan 3 (hereinafter referred to as the first bottom wall portion 13a) from the central portion to both side portions 1c, 1c. The bottom wall 13 is formed in a curved plate shape that gradually descends, and a portion of the bottom wall 13 that does not correspond to the oil pan 3 (hereinafter, referred to as a second bottom wall portion 13b) is formed in a substantially flat plate shape. .

On the other hand, six beam mounting bosses 12, 12, ... Are respectively provided on both sides of the bottom wall 13 in the width direction on the inner side of the peripheral wall 11.
Is the longitudinal direction of the cylinder block reinforcing member 1 (that is,
They are arranged in a row at predetermined intervals in the engine cylinder arrangement direction). And each of these beam mounting bosses 12, 12, ...
As shown in FIGS. 1 and 3, four bearing caps 5, 5, ... Are integrally connected to each other by a pair of left and right beam portions 6, 6 located on both sides thereof. The bearing beam 4 is fastened and fixed by beam mounting bolts 20, 20, .... The beam mounting bosses 12, 12, ... Are reinforced by the reinforcing ribs 15, 15 ,.

Further, in this embodiment, as shown in FIGS. 1 and 2, the oil strainer 7 is connected to the oil pan 3 through the opening 14 formed at one end of the first bottom wall portion 13a of the bottom wall 13. Insert it into the inside of the first bottom wall 13a, and place it in the center of the first bottom wall 13a.
In order to return the oil collected on the bottom wall portion 13a to the oil pan 3 side, the positions between the ribs of the respective reinforcing ribs 15, 15, ... Provided on both sides of the first bottom wall portion 13a are set. First oil return hole 16,16,
.. is formed.

Further, at the boundary between the first bottom wall portion 13a and the second bottom wall portion 13b, the oil that has dropped from the cylinder block 2 side to the second bottom wall portion 13b side can be reliably held at the end of the oil pan 3. The cylinder block reinforcing member 1 for returning to the section
A pair of left and right beam mounting bosses arranged on both sides of the
The second oil return hole 18 (that is, the second oil return hole 18 (in practical Corresponds to the "oil return hole" in the request for registration of a new model)
And the second bottom wall portion 13b of the pair of edge portions of the second oil return hole 18 in the minor axis direction.
A weir-shaped oil regulating rib 19 is provided at the edge portion on the opposite side to the edge portion.

With this configuration, the oil that has reached the second bottom wall portion 13b side from the cylinder block 2 side travels on the second bottom wall portion 13b and is in the shape of an elongated hole having a relatively large opening area. The oil is returned smoothly from the second oil return hole 18 to the oil pan 3 side. The oil returned to the second oil return hole 18 side through the second bottom wall portion 13b is, for example, when the vehicle is suddenly braked or suddenly turned, due to its inertial force. Although it is subjected to the action of jumping over the oil return hole 18 and flowing out to the first bottom wall portion 13a side, in this case, the jumping of this oil is prevented by the dam-like oil restriction ribs 19, and the oil smoothly flows. Returned to the bread 3 side. Due to these synergistic effects, a good oil return property is ensured.

On the other hand, when the oil return hole 18 having such a relatively large opening area is formed, the rigidity of the cylinder block reinforcing member 1, particularly the rigidity of the bottom wall 13 thereof is reduced by that much. The decrease in rigidity due to the provision is offset by the rigidity of the oil restriction rib 19, and the bottom wall 13 maintains good rigidity.

[Brief description of drawings]

FIG. 1 is a plan view of a cylinder block reinforcing member having a reinforcing structure according to an embodiment of the present invention, and FIG. 2 is II of FIG.
-II longitudinal sectional view, FIG. 3 is a III-III longitudinal sectional view of FIG. 1 …… Cylinder block reinforcing member 2 …… Cylinder block 3 …… Oil pan 4 …… Bearing beam 7 …… Oil strainer 11 …… Peripheral wall 12 …… Beam mounting boss 13 …… Bottom wall 13a …… First bottom wall 13b …… Second bottom wall 15 …… Reinforcement rib 16 …… Oil return hole 18 …… Oil return hole 19 …… Oil restriction rib

Claims (2)

(57) [Scope of utility model registration request] 1. A cylinder block reinforcing member having, on a lower surface side of a cylinder block, a peripheral wall having a shape substantially matching an outer peripheral shape of the lower surface of the cylinder block, and a bottom wall provided so as to substantially cover the inside of the peripheral wall. The upper surface of the cylinder block reinforcing member is tightly fixed to the lower surface of the cylinder block in an abutting manner, and the lower surface of the cylinder block reinforcing member is covered with an oil pan so as to partially cover the lower surface of the cylinder block reinforcing member. Further, the second bottom wall portion that does not correspond to the oil pan is attached to a portion of the bottom wall of the cylinder block reinforcing member that is located at the end portion of the oil pan of the first bottom wall portion that corresponds to the oil pan. In addition to forming an oil return hole for returning the oil dropped from the cylinder block side to the oil pan side, The shape of the oil return hole is an elongated hole having a long axis in a direction substantially orthogonal to the flow-down direction of the oil flowing from the second bottom wall portion toward the first bottom wall portion along the second bottom wall portion, Moreover, a weir-shaped oil regulating rib protruding upward from the bottom wall portion is provided at an edge portion of the pair of edge portions in the minor axis direction of the oil return hole which is located on the side opposite to the second bottom wall portion. Reinforcement structure of the engine characterized by that. 2. A reinforcement of an engine according to claim 1, wherein the shape of the bottom wall corresponding to the oil pan is formed into a curved plate shape that gradually inclines downward from the widthwise central portion toward both side portions. Construction.