JP2021161988A - Vibration reduction structure of oil cooler of engine - Google Patents

Abstract

To reduce, in particular, the vertical vibration of an oil cooler, in a unit for supporting the oil cooler and an oil filter by one bracket.SOLUTION: A bracket 20 for supporting an oil cooler 7 and an oil filter 6 is attached to a right-side wall part 2a of a cylinder block 2. The bracket has: an attachment part 21 attached to the right-side wall part, and extending in a first direction being a direction progressing along the right-side wall part out of a horizontal direction; and an extension part 23 connected to the attachment part in a cross state, and extending in a direction apart from the right-side wall part. The extension part supports the oil cooler at one side in the first direction, and on the other hand, supports the oil filter at the other side in the first direction. A first dynamic vibration absorber 40 has: a first fixed part 41a fixed to the extension part; a first mass part 42 arranged in a position in which the center of gravity G1 is overlapped on the oil cooler in the first direction; and a first connecting part 41b having elasticity for connecting the first fixed part and the first mass part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vibration reducing structure of an engine oil cooler.

In the oil filter / oil cooler unit disclosed in Patent Document 1, the oil filter and the oil cooler are supported by brackets attached to the side wall of the engine body.

Japanese Unexamined Patent Publication No. 2005-48725

When the oil cooler and the oil filter are supported by one bracket as in Patent Document 1, the oil cooler and the oil filter may vibrate up and down in substantially the same phase as each other. The amplitude of this vertical vibration is particularly large on the oil cooler side, which is heavier than the oil filter.

The present invention has been made in view of these points, and an object of the present invention is to reduce vertical vibration of the oil cooler, particularly in a unit in which the oil cooler and the oil filter are supported by one bracket.

The vibration reduction structure of the oil cooler of the engine according to the present invention is attached to an oil filter, an oil cooler heavier than the oil filter, and any of the front, rear, left and right walls of the engine body, and the oil cooler and the oil filter are attached. The bracket is provided with a supporting bracket and a first dynamic vibration absorber, and the bracket is attached to the wall portion and extends in the first direction, which is the direction along the wall portion in the horizontal direction, and the mounting portion. It has an extension portion that is connected in a crossed state and extends in a direction away from the wall portion, and the extension portion supports the oil cooler on one side in the first direction, while the first The oil filter is supported on the other side in one direction, and the first dynamic vibration absorber is located at a position where the center of gravity of the first fixed portion fixed to the extending portion overlaps with the oil cooler in the first direction. It has an arranged first mass portion and a first connecting portion having elasticity that connects the first fixed portion and the first mass portion.

The oil cooler and the oil filter supported by the extension portion vibrate up and down in substantially the same phase with each other starting from the connection point between the attachment portion and the extension portion in the bracket. The amplitude of this vertical vibration is particularly large in an oil cooler that is heavier than an oil filter. Therefore, it is particularly required to reduce the vibration of the oil cooler.

According to this configuration, by arranging the first mass part of the first dynamic vibration absorber on the oil cooler side, it is possible to apply vertical vibration in the opposite phase to the vertical vibration of the oil cooler and the oil filter to the oil cooler. can. As a result, the vertical vibration of the oil cooler having a large amplitude can be reduced.

In one embodiment, the fixing portion of the first fixing portion with respect to the extending portion is located on the side away from the wall portion from the center of gravity of the oil cooler and the entire oil filter.

The vibration of the object supported by the extending portion may include a rotational component around the central axis extending in the first direction in addition to the vertical component. The amplitude of vibration in the rotation direction component increases as the distance from the wall increases.

According to such a configuration, the first dynamic vibration absorber is located far from the wall portion as a whole, rather than the center of gravity of the oil cooler and the entire oil filter. That is, the amplitude of vibration in the rotation direction component of the entire first dynamic vibration absorber is larger than the vibration amplitude in the rotation direction component of the oil cooler and the oil filter. As a result, the amplitude of the anti-phase vibration in the rotation direction component applied to the oil cooler by the first mass part can be further increased.

In one embodiment, the center of gravity of the first mass portion is located on the side away from the wall portion from the first fixed portion.

According to such a configuration, even if the fixing portion between the first fixing portion and the extending portion cannot be moved any more, the position of the center of gravity of the first mass portion can be positioned further away from the wall portion. can.

In one embodiment, a convex portion is provided on the surface of the extending portion, and the first fixing portion is fixed to the convex portion.

According to such a configuration, the mounting rigidity of the first dynamic vibration absorber with respect to the bracket is weakened, so that the first mass portion can be more easily vibrated.

In one embodiment, the extension portion is connected to the mounting portion at a position eccentric to one side or the other side in the first direction.

From the viewpoint of reducing the vertical vibration of the oil cooler, it is effective to connect the extending portion to the central portion of the mounting portion in the first direction to increase the connection rigidity between the extending portion and the mounting portion. However, the position of the oil cooler and the position of the oil filter are usually determined by the layout of the engine lubrication system and the cooling system. Therefore, the extension portion that supports the oil cooler and the oil filter may have to be connected at a position eccentric to one side in the first direction of the mounting portion. In this case, the oil cooler is more likely to vibrate than when the extension portion is connected to the central portion in the first direction of the mounting portion. Therefore, by taking the above-mentioned vibration reduction measures, it is possible to alleviate the ease of vibration of the oil cooler due to the eccentricity of the connection portion between the extending portion and the mounting portion.

In one embodiment, a second vibration absorber is further provided, and the second dynamic vibration absorber is located at a position where the center of gravity overlaps with the oil filter in the first direction with the second fixed portion fixed to the extension portion. It has an arranged second mass portion and a second connecting portion having elasticity that connects the second fixed portion and the second mass portion.

Torsional vibration or the like may occur in the bracket due to the mass imbalance between the oil cooler and the oil filter, the eccentricity of the connection point between the extension part and the mounting part, and the like. According to such a configuration, it can be expected that not only the first dynamic vibration absorber is provided on the oil cooler side but also the second dynamic vibration absorber is provided on the oil filter side to reduce the torsional vibration generated in the bracket.

According to the present invention, in a unit in which the oil cooler and the oil filter are supported by one bracket, the vertical vibration of the oil cooler can be particularly reduced.

FIG. 1 is a right side view showing an engine according to an embodiment of the present invention. FIG. 2 is an enlarged view of the oil cooler / oil filter unit in FIG. FIG. 3 is an enlarged view of the first tuned mass damper in FIG. FIG. 4 is a top view showing an oil cooler / oil filter unit. FIG. 5 is a diagram showing a first mode of vibration of the oil cooler and the first mass part. FIG. 6 is a diagram showing a second mode of vibration of the oil cooler and the first mass part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of preferred embodiments is merely exemplary and is not intended to limit the present invention, its applications or its uses.

The engine 1 shown in FIG. 1 is a longitudinal multi-cylinder engine in which a plurality of cylinders (not shown) are arranged in the vehicle front-rear direction (horizontal direction in FIG. 1), and the direction in which the central axis of the crankshaft (not shown) extends. (Crankshaft direction) coincides with the vehicle front-rear direction.

In FIG. 1, X is a first direction described later, Z is a vertical direction, and θ is a rotation direction around a central axis extending in the first direction. In FIG. 4, Y is a direction away from the right side wall portion 2a described later.

As shown in FIG. 1, a cylinder head 3 is provided on the upper part of the cylinder block 2. In FIG. 1, 4 is an oil pan and 5 is a water pump. In the present specification, the cylinder block 2, the cylinder head 3, and the oil pan 4 are collectively referred to as an "engine body 10". Although not shown, a transmission is arranged on the rear side of the engine body 10.

The engine 1 includes an oil filter 6. The oil filter 6 filters the engine oil that lubricates each part of the engine 1.

The engine 1 includes an oil cooler 7. The oil cooler 7 cools the engine oil with the engine coolant. The oil cooler 7 is heavier than the oil filter 6.

As shown in FIG. 2, the oil cooler 7 and the oil filter 6 are supported by a bracket 20 having a substantially T shape (see FIG. 4) when viewed from above, and constitutes an oil cooler oil filter unit U. There is. The bracket 20 is attached to the right side wall portion 2a of the cylinder block 2 (engine body 10).

The bracket 20 has a mounting portion 21 attached to the right wall portion 2a. The mounting portion 21 extends in the first horizontal direction along the right side wall portion 2a.

In the present embodiment, the first direction substantially coincides with the crank axis direction. Hereinafter, the right side (front side of the vehicle) in the figure is referred to as one side in the first direction, and the left side (rear side of the vehicle) in the figure is referred to as the other side in the first direction.

The mounting portion 21 is formed in a substantially trapezoidal plate shape that is long in the first direction. The mounting portion 21 is fastened to the mounting seat 2b (see FIG. 4) provided on the right side wall portion 2a of the cylinder block 2 by bolts 22.

The bracket 20 has an extension portion 23 connected to the mounting portion 21 in a crossed state. Specifically, the extending portion 23 is connected to a position A eccentric to the other side in the first direction of the mounting portion 21 (hereinafter, referred to as “connection point A”). Further, the extending portion 23 is connected to a portion of the mounting portion 21 on the lower side in the vertical direction.

As shown in FIGS. 2 and 4, the extending portion 23 extends in a direction away from the right side wall portion 2a. Further, the extending portion 23 also extends downward.

The extending portion 23 supports the oil cooler 7 on one side in the first direction. Specifically, a cooler support portion 24 is provided on one side of the extension portion 23 in the first direction. A flange portion 24a is formed on the cooler support portion 24. The oil cooler 7 is fastened by bolts 26 in a state where the flange portion 7a is joined to the flange portion 24a. As shown in FIG. 4, the cooler support portion 24 (flange portion 24a) is slightly tilted toward the right side wall portion 2a when viewed from above.

On the other hand, the extending portion 23 supports the oil filter 6 on the other side in the first direction. Specifically, a filter support portion 28 is provided on the other side of the extension portion 23 in the first direction. An opening (not shown) is formed in the filter support portion 28. The bottomed cylindrical oil filter 6 is fitted in the opening.

Although not shown, an oil flow path through which engine oil flows and a cooling flow path through which coolant flows are provided inside the bracket 20. Specifically, in the portion from the mounting portion 21 to the extending portion 23, as an oil flow path, an upper flow path for communicating the inside of the cylinder block 2 and the oil filter 6 and an oil filter 6 and an oil cooler 7 are provided. A middle flow path for communicating with each other and a lower flow path for communicating with the inside of the oil cooler 7 and the cylinder block 2 are provided. Further, the extending portion 23 is provided with a flow path for communicating the oil cooler 7 and the outside of the bracket 20 as a cooling flow path.

Hereinafter, the vibration reduction structure of the oil cooler of the engine will be described in detail. As shown in FIG. 3, the engine 1 according to the present embodiment includes a first dynamic damper (dynamic damper) 40. The first dynamic vibration absorber 40 is composed of a spring-mass system, and has a leaf spring 41 extending in the first direction and having a thickness direction in the vertical direction, and a block 42 provided at the tip of the leaf spring 41. And have.

The block 42 constitutes a mass portion of the first dynamic vibration absorber 40 (hereinafter, referred to as “first mass portion 42”). As shown in FIG. 3, the first mass portion 42 is arranged at a position where its center of gravity G1 overlaps with the oil cooler 7 in the first direction.

The leaf spring 41 has elasticity. The base end portion 41a of the leaf spring 41 constitutes a fixing portion of the first dynamic vibration absorber 40 (hereinafter, referred to as “first fixing portion 41a”). The first fixing portion 41a is fixed to the extending portion 23.

Specifically, on the upper surface of the extending portion 23, a substantially columnar boss portion 30 projecting upward is provided as a convex portion. The first fixing portion 41a is fixed to the boss portion (convex portion) 30. Specifically, the boss portion 30 is provided with a screw hole (not shown). The bolt 31 is passed through a bolt through hole (not shown) provided in the first fixing portion 41a and screwed into the screw hole of the boss portion 30. As a result, the first fixing portion 41a is fastened to the boss portion 30. In FIGS. 3 and 4, reference numeral 32 is a positioning portion for positioning the position of the first fixing portion 41a in the first direction.

A portion of the leaf spring 41 on one side in the first direction from the base end portion (first fixing portion) 41a constitutes a first connecting portion 41b of the first dynamic vibration absorber 40 (hereinafter, “first connecting portion 41b””. ). The first connecting portion 41b connects the first fixing portion 41a and the first mass portion 42.

As shown in FIG. 4, the fixing portion B (boss portion 30) of the first fixing portion 41a with respect to the extending portion 23 is separated from the right side wall portion 2a from the center of gravity position G2 of the oil cooler 7 and the oil filter 6 as a whole. It is located on the side (lower side in FIG. 4).

Further, as shown in FIG. 4, the leaf spring 41 does not extend straight in the first direction, but extends from the base end portion (first fixed portion) 41a side to the tip end portion (first mass portion) 42 side. It extends diagonally on one side in one direction and away from the right wall portion 2a. That is, the center of gravity G1 of the first mass portion 42 is located on the side (lower side in FIG. 4) away from the right side wall portion 2a with respect to the first fixing portion 41a (fixing portion B).

The natural frequency of the first dynamic vibration absorber 40 is preferably close to the natural frequency of the oil cooler 7. For this purpose, the mass of the first mass portion 42 and the bending rigidity of the first connecting portion 41b (leaf spring 41) may be appropriately set. In order to set the flexural rigidity of the first connecting portion 41b (leaf spring 41), the length, Young's modulus, and moment of inertia of area of the first connecting portion 41b may be appropriately set.

As described above, when the engine 1 is being driven, the oil cooler 7 and the oil filter 6 supported by the extension portion 23 are connected to each other starting from the connection point A between the attachment portion 21 and the extension portion 23 in the bracket 20. It vibrates up and down in substantially the same phase. As shown in FIGS. 5 and 6, the amplitude of this vertical vibration is particularly large in the oil cooler 7 which is heavier than the oil filter 6. Therefore, it is particularly required to reduce the vibration of the oil cooler 7.

According to the present embodiment, by arranging the first mass portion 42 of the first dynamic vibration absorber 40 on the oil cooler 7 side, vertical vibration having a phase opposite to the vertical vibration of the oil cooler 7 and the oil filter 6 can be generated in oil. It can be given to the cooler 7. Specifically, as shown in FIG. 5, when the oil cooler 7 moves upward, the first mass portion 42 moves downward in the vicinity (upper side) of the oil cooler 7. On the other hand, as shown in FIG. 6, when the oil cooler 7 moves downward, the first mass portion 42 moves upward in the vicinity (upper side) of the oil cooler 7. As a result, the vertical vibration of the oil cooler 7 having a large amplitude can be reduced.

As described above, in the unit U in which the oil cooler 7 and the oil filter 6 are supported by one bracket 20, the vertical vibration of the oil cooler 7 can be particularly reduced.

The vibration of the object (oil cooler 7, oil filter 6, and first dynamic vibration absorber 40) supported by the extension portion 23 extends in the first direction (X direction) in addition to the vertical (Z direction) component. It may contain components in the direction of rotation (θ direction) around the central axis. The amplitude of vibration in the rotation direction (θ direction) component increases as the distance from the right side wall portion 2a increases.

The first dynamic vibration absorber 40 is located as a whole away from the right side wall portion 2a of the center of gravity G2 of the oil cooler 7 and the oil filter 6 as a whole. That is, the amplitude of vibration in the rotation direction (θ direction) component of the entire first dynamic vibration absorber 40 is larger than the vibration amplitude in the rotation direction (θ direction) component of the oil cooler 7 and the oil filter 6. As a result, the amplitude of the vibration of the opposite phase in the rotation direction (θ direction) component applied to the oil cooler 7 by the first mass portion 42 can be further increased.

Even if the fixing portion B between the first fixing portion 41a and the extending portion 23 cannot be moved any more, the position of the center of gravity G1 of the first mass portion 42 should be positioned further away from the right side wall portion 2a. Can be done.

Since the first fixing portion 41a is fixed to the boss portion (convex portion) 30, the mounting rigidity of the first dynamic vibration absorber 40 to the bracket 20 is weakened, and the first mass portion 42 can be more easily vibrated.

From the viewpoint of reducing the vertical vibration of the oil cooler 7, the extension portion 23 is connected to the central portion C in the first direction of the mounting portion 21 to increase the connection rigidity between the extension portion 23 and the mounting portion 21. Is valid. However, usually, the position of the oil cooler 7 and the position of the oil filter 6 are determined by the layout of the lubrication system and the cooling system of the engine. Therefore, the extension portion 23 that supports the oil cooler 7 and the oil filter 6 may have to be connected to the position A eccentric to one side (for example, the other side) in the first direction of the mounting portion 21. In this case, the oil cooler 7 is more likely to vibrate than when the extending portion 23 is connected to the central portion C in the first direction of the mounting portion 21. Therefore, by taking the above-mentioned vibration reduction measures, it is possible to alleviate the ease of vibration of the oil cooler 7 due to the eccentricity of the connection portion A between the extension portion 23 and the mounting portion 21.

Hereinafter, a modified example of the present embodiment will be described. As shown by the alternate long and short dash line in FIG. 3, in this modified example, the engine 1 further includes a second dynamic vibration absorber 50. The basic configuration of the second dynamic vibration absorber 50 is almost the same as that of the first dynamic vibration absorber 40. That is, the second vibration absorber 50 includes a second fixed portion 51a fixed to the extending portion 23, a second mass portion 52 arranged at a position where the center of gravity G3 overlaps the oil filter 6 in the first direction, and a second mass damper. It has a second connecting portion 51b having elasticity for connecting the two fixing portions 51a and the second mass portion 52.

Torsional vibration or the like may occur in the bracket 20 due to the mass imbalance between the oil cooler 7 and the oil filter 6, the eccentricity of the connection portion A between the extension portion 23 and the mounting portion 21, and the like. According to this modification, not only the first dynamic vibration absorber 40 is provided on the oil cooler 7 side, but also the second dynamic vibration absorber 50 is provided on the oil filter 6 side to reduce torsional vibration and the like generated in the bracket 20. You can expect to do it.

Although the present invention has been described above in terms of preferred embodiments, such a description is not a limitation, and of course, various modifications can be made.

The extending portion 23 may be connected to a position eccentric to one side of the mounting portion 21 instead of the other side in the first direction. Further, the extending portion 23 may be connected to the central portion C instead of the position eccentric to one side in the first direction of the mounting portion 21.

The shape of the bracket 20 is not limited to a substantially T-shape, and may be, for example, a substantially L-shape. Any configuration may be used as long as the extending portion 23 is connected to the mounting portion 21 so as to intersect with the mounting portion 21 and extends in a direction away from the right side wall portion 2a.

The mounting location of the bracket 20 is not limited to the right side wall portion 2a of the cylinder block 2. The bracket 20 may be attached to any of the front, rear, left, and right walls of the engine body 10 (cylinder block 2, cylinder head 3, and oil pan 4).

For example, two or more brackets 20 that support the oil cooler 7 and the oil filter 6 are prepared, and the brackets 20 are attached to two or more of the front, rear, left, and right wall portions of the engine body 10. You can attach it.

The connecting portion does not have to be composed of a leaf spring. The connecting portion may be made of any member as long as it has elasticity.

The engine 1 may be a transverse engine.

Since the present invention can be applied to a vibration reducing structure of an engine oil cooler, it is extremely useful and has high industrial applicability.

A Connection point B Fixation point G1 Center of gravity G2 Center of gravity G3 Center of gravity θ Rotational direction component X 1st direction (crank axis direction)
Y Direction away from the right side wall Z Vertical direction 1 Engine 2 Cylinder block 2a Right side wall 3 Cylinder head 4 Oil pan 6 Oil filter 7 Oil cooler 10 Engine body 20 Bracket 21 Mounting part 23 Extension part 30 Boss part (convex part)
40 1st Tuned Mass Damper 41 Leaf Spring 41a 1st Fixed Part (Base End)
41b 1st connecting part 42 1st mass part (block)
50 2nd Tuned Mass Damper 51a 2nd Fixed Part 51b 2nd Connecting Part 52 2nd Mass Part

Claims (6)

With an oil filter
With an oil cooler heavier than the oil filter,
A bracket that is attached to either the front, rear, left, or right wall of the engine body and supports the oil cooler and the oil filter.
Equipped with a first dynamic damper
The bracket is
A mounting portion that is mounted on the wall portion and extends in the first horizontal direction, which is a direction along the wall portion.
It has an extension portion that is connected to the mounting portion in a crossed state and extends in a direction away from the wall portion.
The extending portion supports the oil cooler on one side in the first direction, while supporting the oil filter on the other side in the first direction.
The first dynamic vibration absorber
The first fixing portion fixed to the extending portion and
A first mass portion arranged at a position where the center of gravity overlaps the oil cooler in the first direction, and
A vibration-reducing structure for an engine oil cooler, which has an elastic first connecting portion that connects the first fixing portion and the first mass portion. In claim 1,
The fixed portion of the first fixing portion with respect to the extending portion is a vibration reducing structure of the oil cooler of the engine, which is located on a side away from the wall portion from the center of gravity of the oil cooler and the entire oil filter. In claim 2,
The center of gravity of the first mass portion is located on the side away from the wall portion from the first fixed portion, and is a vibration reducing structure of the oil cooler of the engine. In any one of claims 1 to 3,
A convex portion is provided on the surface of the extending portion.
The first fixing portion is a vibration reducing structure of an engine oil cooler fixed to the convex portion. In any one of claims 1 to 4,
The extension portion is connected to the mounting portion at a position eccentric to one side or the other side in the first direction, and is a vibration reducing structure of an engine oil cooler. In any one of claims 1 to 5,
Equipped with a second tuned mass damper
The second dynamic vibration absorber
The second fixing part fixed to the extending part and
A second mass part arranged at a position where the center of gravity overlaps the oil filter in the first direction, and
A vibration-reducing structure for an engine oil cooler, which has an elastic second connecting portion that connects the second fixing portion and the second mass portion.

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