JP7084094B2 - Internal combustion engine for automobiles - Google Patents

Description

The present invention relates to a bracket that supports pipes such as hoses and cables such as harnesses in an internal combustion engine for automobiles.

The internal combustion engine of an automobile is equipped with a large number of flexible pipes and cables such as hoses and tubes, and these flexible pipes and cables prevent sagging and interfere with other members. It is often supported by brackets to prevent it. The bracket may be a cast or die-cast product, but is often made of sheet metal when supporting light members such as pipes and cables.

As an example of such a bracket, Patent Document 1 discloses a sheet metal bracket that supports a breather hose. This bracket is fixed to the transmission case (transmission housing) with two bolts. The fixed part that overlaps the transmission case is bent and formed at the base end, and the clip that holds the breather hose is formed at the tip end. Is attached.

The bracket of Patent Document 1 protrudes in a posture parallel to the perpendicular line of the fixed portion (in other words, the axis of the bolt), and the cross-sectional shape is substantially U-shaped. Therefore, it can be said that the bracket retains high strength against vibration.

Japanese Unexamined Patent Publication No. 2007-170487

By the way, brackets are arranged in various parts in an internal combustion engine. For example, in an automobile slant type internal combustion engine in which the cylinder bore is greatly inclined to the horizontal side, a bracket is fixed to the lower surface of the cylinder block so that pipes and cables arranged on the lower surface of the cylinder block do not drip. It is supported by brackets.

In this case, the internal combustion engine is located in the engine room of the car, but since there is often a large space at the bottom of the engine room, the bracket may be exposed toward the road surface (ground). If so, the road surface may be raised and the so-called belly may be rubbed, the wheels may be depressed due to the depression of the road surface and the engine room may be sunk, or the vehicle may collide with a stone when traveling forward or the vehicle may be driven in a snowy area. The snow mass that has accumulated and grown on the lower surface may peel off and collide with the pipes and cables placed on the lower surface of the cylinder block, and a pressing force may be applied to the bracket, causing external force such as bending or compression to act on the bracket. ..

When the bracket of Patent Document 1 is adopted as the bracket exposed on the road surface, the bracket has a structure resistant to buckling, so that the bracket is deformed when a load from the axial direction thereof is applied to the bracket. There is a risk that the cylinder block will be damaged without it, and there is a concern that it will not be possible to drive.

The present invention has been made against the background of such a situation, and an object thereof is to provide a bracket capable of absorbing an impact due to a collision or the like by itself even when the bracket is arranged on the lower surface of an internal combustion engine for an automobile. It is a thing.

The invention of the present application is
"It has an engine body arranged in the engine room of an automobile and a bracket arranged so as to project from the lower surface of the engine body to support pipes or cables at the tip , and the bracket is a front wheel of the automobile. It is located behind and covers the pipes or cables from the outside in the vehicle width direction. "
It is a basic configuration, and further
"The bracket comprises a first plate and a second plate joined so as to intersect in a T-shaped or L-shaped cross section, and bolted to the base end of the first plate and to the surface of the engine body. While the fixed piece to be fastened is bent and formed, a holding portion for the pipes or cables is provided at the tip of the first plate or the second plate.
Further , the first plate and the second plate of the bracket have both front and back surfaces inclined to each other with respect to the perpendicular line of the fixed piece, or are in a twisted posture around the longitudinal axis of both plates. "
It is configured as.

In the present invention, the first plate and the second plate may be inclined only with respect to the perpendicular line of the fixed piece, or may have only a twisted shape, but are twisted around the axis while being inclined. It is preferably configured.

In the present invention, since the pipes or cables held by the bracket are covered from the left and right outside by the bracket, the pipes or cables can be protected from the pebbles flipped up by the front wheels.
Further, in the present invention, since the first plate and the second plate intersect in a T-shape or an L-shape, pipes and cables can be firmly supported without being easily bent. Further, since the structure has a high geometrical moment of area with respect to the bending force and is hard to vibrate, the natural frequency can be increased and noise vibration can be suppressed. Therefore, the function as a bracket is not impaired.

When the bracket is placed on the lower surface of the engine body, an external force acts on the bracket from various methods such as an external force for tilting the bracket and an external force for compressing the bracket in the axial direction. Since the bracket is in the state of a cantilever, it can be easily bent and deformed by an external force such as tilting the bracket. Therefore, it is possible to prevent damage to the engine body such as the cylinder block.

On the other hand, if both the front and back surfaces of the first plate and the second plate are inclined with respect to the perpendicular line of the fixed piece, the load in the longitudinal axis direction of the bracket acts even if the load in the perpendicular direction of the fixed piece acts. Even so, both plates will bend and deform before buckling deformation, and the bracket itself will bend and deform (bend deformation), and the impact will be absorbed. Therefore, it is possible to prevent the engine body from being damaged by the tensioning action of the bracket.

The same applies when both plates are twisted around the longitudinal axis center, and even if a load in the longitudinal axis center direction is applied, both plates bend and deform before buckling deformation and the impact is absorbed. Further, when both plates are twisted, bending deformation is allowed even if bending force is applied from various directions, so that the impact absorption performance is excellent.

It is a front view which looked at the internal combustion engine which concerns on embodiment from the front of the vehicle body. It is a bottom view of FIG. It is the bottom view of the main part viewed from substantially the same direction as FIG. 2, and the vehicle body frame and the front wheel drive propeller shaft are omitted. FIG. 2 is an IV-IV perspective view of FIG. 2 with the vehicle body frame omitted. Both (A) and (B) are perspective views of the bracket. (A) is a plan view of the bracket, (B) is a sectional view taken along the line BB of (A), and (C) is a sectional view taken along the line CC of (B).

Next, an embodiment of the present invention will be described with reference to the drawings. In the following, the front-back and left-right words are used to specify the direction, but these directions are based on the driver (therefore, the left-right direction is the vehicle width direction) . However, the front view is in the direction facing the driver.

(1). Overview This embodiment is applied to a mount bracket for an internal combustion engine of a four-wheel drive one-pox vehicle. FIG. 1 is a view of the internal combustion engine viewed from the crank axis direction. The internal combustion engine is arranged in the engine room with the crank axis (axis center) O1 in a long posture in the front-rear direction of the vehicle body. Therefore, the internal combustion engine of the present embodiment is installed vertically.

Further, since the automobile is a one-box, the engine room is below the driver's seat, and the internal combustion engine is a slant type in which the cylinder bore axis O2 is greatly inclined to a state close to horizontal.

Further, the internal combustion engine has four cylinders, the cylinder block 1 and the cylinder head 2 fixed to the top surface thereof, the head cover 3 fixed to the top surface of the cylinder head 2, and the auxiliary crankcase fixed to the bottom surface of the cylinder block 1. 4. An oil pan 5 fixed to the lower surface of the auxiliary crankcase 4 and the auxiliary crankcase 4 is provided, and timing is provided on the front surface of the cylinder block 1, the front surface of the cylinder head 2, and the front surface of a part of the auxiliary crankcase 4. The front cover 6 covering the chain is overlapped and fixed.

Therefore, the engine body is composed of the cylinder block 1, the cylinder head 2, the head cover 3, the auxiliary crankcase 4, the oil pan 5, and the front cover 6, and in FIG. 1, the crank pulley is arranged on the front side of the paper surface. Cylinder. On the other hand, a mission case (power plant) is arranged on the back side of the paper surface, and the mission case is fixed so as to straddle the rear surface of the cylinder block 1 and the auxiliary crankcase 4.

The upper surface of the cylinder head 2 is the intake side surface and the lower surface is the exhaust side surface, and a manifolder (complex of exhaust manifold and catalyst case , not shown ) covered with an insulator 7 is fixed to the exhaust side surface. Has been done. Further, although not shown, an intake manifold is fixed to the upper surface of the cylinder head 2.

As shown in FIGS. 1 and 2, a lower frame 8 forming a part of the vehicle body frame is arranged below the internal combustion engine, and first and second support frames (sides) are arranged at both left and right ends of the lower frame 8. While the frames 9 and 10 are erected, the front mount bracket 11 is fixed to the rear portion of the lower surface of the cylinder block 1, and the rear mount bracket 12 is fixed to the auxiliary crankcase 4. The front mount bracket 11 is connected to the first support frame 9 via the first rubber 13, and the rear mount bracket 12 is connected to the second support frame 10 via the second rubber 14.

The automobile of the present embodiment is a four-wheel drive vehicle, and a propeller shaft 17 for driving the front wheels is arranged in the vicinity of the lower surface of the cylinder block 1 substantially parallel to the crank axis O1. The propeller shaft 17 penetrates through a relief hole 18 formed in the front mount bracket 11. The power of the propeller shaft 17 is transmitted to the front wheels via the differential.

Although not shown, the internal combustion engine is also supported by the vehicle body frame by a side mount bracket (not shown) fixed to the rear of the cylinder block 1. Therefore, the internal combustion engine is supported by the vehicle body frame by three mount brackets. The front mount bracket 11 is partially hidden by other members in the front view of FIG. 1. Therefore, in FIG. 1, the entire front mount bracket 11 does not appear.

(2). Hose support bracket As shown in FIGS. 1 and 2, the cooling water return pipe line 21 is arranged so as to extend from the lower surface of the front portion of the cylinder block 1 to the upper portion of the cylinder head 2. As shown in FIG. 3, the cooling water return pipe 21 has a first hose 23 having one end connected to an inlet port (inlet of a water pump) 22 provided on the lower surface of the cylinder block 1 and the other end of the first hose 23. It is composed of a three-way joint 24 connected to the three-way joint 24, and a second hose 25 and a third hose 26 having one end connected to the three-way joint 24.

The other end (starting end) of the second hose 25 is connected to the water distribution unit 27 formed on the upper part of the cylinder head 2, and the other end (starting end) of the third hose 26 is connected to the heater core for heating the inside of the vehicle. .. Therefore, the second hose 25 is a bottom bypass passage, the third hose 26 is a heater return passage, and the first hose 23 is a collective passage.

As can be understood from FIG. 3, the first hose 23 has a long posture in the front-rear direction, and is supported by a hose bracket (piping bracket) 28 fixed to the lower surface of the cylinder block 1 so as not to hang down. .. To be precise, one connection port 24a of the three-way joint 24 is inserted into the other end of the first hose 23, and this connection port and the first hose 23 are clamped by the hose bracket 28. Therefore, the three-way joint 24 is also supported by the hose bracket 28.

As shown in FIGS. 5 and 6, the hose bracket 28 has a first plate 29 and a second plate 30 that are generally long in the front-rear direction, and one wide surface of the second plate 30 is the first plate 29. The butt joints are welded to the end faces. Therefore, the first plate 29 and the second plate 30 are in a crossed posture.

A fixing piece 32 fixed to the cylinder block 1 by a bolt 31 is formed at the base end of the first plate 29. A tongue-shaped positioning piece 33 protruding toward the cylinder block 1 is bent and formed on the fixed piece 32. For example, as can be understood from FIG. 4, of the cylinder block 1, the fastened portion (boss portion) 34 on which the fixing piece 32 of the hose bracket 28 overlaps has a vertical wall surface. Therefore, the bolt 31 is substantially horizontal and has a left-right longitudinal posture. The fastened portion 34 of the cylinder block 1 is provided with a positioning hole (not shown) into which the positioning piece 33 is fitted.

The first plate 29 has a first portion 29a connected to the fixed piece 32 and a second portion 29b bent from the first portion 29a, while the second plate 30 is approximately the first of the first plate 29. It has a first portion 30a that overlaps one portion 29a and a second portion 30b that overlaps a second portion 29b of the first plate 29. The second portion 30b of the second plate 30 protrudes from the tip of the first plate 29, and the protruding tip portion 30c has a first hose 23 (and a three-way joint 24) as an example of the holding portion described in the claims. A resin clip 36 for clamping one of the connection ports 24a) is attached.

As shown in FIG. 5, the clip 36 has a fixed portion 38 and a movable portion 39 integrally continuous via a hinge portion 37, and is formed on the fixed portion 38 at the tip end portion of the second plate 30. A mushroom-shaped pin 41 that snap-engages to the mounting hole 40 (see FIGS. 5A and 5B) is integrally formed. Further, while the engaging claw 42 is formed at the tip of the movable portion 39, the fixing portion 38 is formed with a receiving portion 43 into which the engaging claw 42 is fitted, and the receiving portion 43 is elastically resisted. By pushing and spreading, the engaging claw 42 engages with the receiving portion 43. The tip portion 30c of the second portion 30b of the second plate 30 is wide in order to secure the mounting area of the clip 36.

As shown in FIG. 5, with reference to the fixed piece 32, the vertical line of the fixed piece 32 is defined as the left-right longitudinal Y-axis, the axis orthogonal to the Y-axis and long in the front-rear direction is the X-axis, and the X-axis and Y Assuming that the axis orthogonal to the axis is the vertically long Z axis, both the first plate 29 and the second plate 30 are inclined with respect to the Y axis.

Further, as can be understood from FIG. 6 (A), the second portion 29b of the first plate 29 is inclined with respect to the XY plane, and as can be understood from FIG. 6 (B), the second plate 30 The second portion 30b is inclined with respect to the XY plane and also with respect to the Y axis. Therefore, the first plate 29 and the second plate 30 are twisted with respect to their longitudinal axes.

Further, as can be understood from FIGS. 6A and 6B, the second plate 30 intersects the fixed piece 32 in an L shape, but the first portion 29a and the second plate 30 of the first plate 29 The first portion 30a is crossed in a T shape, and the second portion 29b of the first plate 29 and the second portion 30b of the second plate 30 are also crossed in a T shape. In this case, the crossover angle between the first plate 29 and the second plate 30 is an acute angle smaller than 90 °. Further, as shown in FIG. 6A, the first plate 29 and the second plate 30 are tilted with respect to the X-axis and the Y-axis in a gently curved posture.

Further, as shown in FIG. 6A, the position where the second portion 29b of the first plate 29 hits the second portion 30b of the second plate 30 is in the width direction of the second portion 30b in the second plate 30. Although it is moving in the (W direction) and crosses in a T-shape, the crossover mode gradually changes from a state close to the L-shape to a pure T-shape.

As can be understood from FIG. 2, the propeller shaft 17 is arranged below the hose bracket 28, and most of the hose bracket 28 is covered with the propeller shaft 17 from below. Further, as shown in FIG. 3, the first hose 23 and the hose bracket 28 partially overlap each other in a side view , and a part of the first hose 23 is covered by the hose bracket 28 from the left and right outside . ing.

Further, as shown in FIGS. 3 and 4, the auxiliary drive belt 45 is arranged above the hose bracket 28.

(3). Summary By the way, the load of the cooling water return line 21 is applied to the hose bracket 28 from above, but since the internal combustion engine is vibrating, the load of the cooling water return line 21 is a dynamic load (alternate load). Acts as. However, the hose bracket 28 is a form in which two plates 29 and 30 are crossed in a T shape, and as can be understood from FIG. 4, the first plate 29 functions as a rib for preventing bending and deformation of the second plate 30. Therefore, even if the load of the cooling water return pipe 21 acts as a dynamic load, it can be accurately supported. Further, since the hose bracket 28 is in the form of a narrowed tip as a whole, resonance can be suppressed.

Further, since the hose bracket 28 is fixed to the cylinder block 1 in the posture of a cantilever projecting forward, it may bend and deform when some external force is applied from below. Therefore, it is possible to prevent the hose bracket 28 from being stretched against the cylinder block 1 by an external force from below while ensuring the necessary support strength.

In addition, when traveling forward, it collides with a stone protruding to the ground, and when traveling in a snowy area, a snow mass that accumulates and grows on the underside of the vehicle peels off and collides with pipes and cables arranged on the underside of the cylinder block and pushes it. External force may act on the hose bracket 28 from the front due to pressure or the like, but in this case, since the hose bracket 28 is tilted in both the left-right direction and the up-down direction, it bends and deforms before buckling. And can absorb external force. Therefore, damage to the cylinder block 1 can be prevented. In this case, since the hose bracket 28 is twisted around its axis, it can be subjected to an impact from the front, an impact from a direction inclined in the left-right direction, and an impact from a direction inclined in the vertical direction. On the other hand, it can be accurately bent and deformed to absorb the impact.

Since the bottom of the engine room is open, when the car is traveling in a snowfall area, as shown by the arrow 47 in FIG. 4, the snow has made holes in the lower frame 8 and the bottom plate 46 of the engine room (not shown). A snow mass may grow on the upper side of the bottom plate 46 and strongly hit the first hose 23, the auxiliary drive belt 45, and the crank pulley. Then, the first hose 23 is pressed and crushed and deformed, or resistance is generated in the rotation of the auxiliary drive belt 45 and the crank pulley, so that the drive torque is lowered.

In this respect, in the present embodiment, since the hose bracket 28 is arranged on the side or the lower side of the first hose 23 and the auxiliary drive belt 43, the hose bracket 28 can prevent the snow mass from invading upward. Therefore, it is possible to prevent the first hose 23 from being crushed by snow and the rotation of the crank pulley and the auxiliary drive belt 45 from being resisted when traveling on a snowy road.

As is roughly shown in FIG. 2, the hose bracket 28 is located on the right side surface 48 of the vehicle body. In addition, the front wheels are located on the front side of the internal combustion engine. For this reason, pebbles that are flipped up when the vehicle is running may fly toward the lower surface of the rear part of the internal combustion engine as shown by arrows 49 in FIGS. 2 and 3, and if the pebbles hit the first hose 23 directly, they will be damaged. There is a danger of.

In this respect, in the present embodiment, since the first hose 23 is covered by the hose bracket 28 from the outside in the left-right direction, the hose bracket 28 causes the first hose 23 to fly toward it from the pebbles. Can be protected. Referring to FIG. 4, the hose bracket 28 prevents the pebbles flying from the direction orthogonal to the paper surface from hitting the first hose 23.

In the present embodiment, the first plate 29 and the second plate 30 can be manufactured by punching out the material plates and then bending them with a bender or the like, so that press working using a die is not required, and the cost is increased accordingly. Can be suppressed. This point is also one of the advantages of this embodiment.

Although one embodiment of the present invention has been described above, the present invention can be embodied in various ways. For example, in the embodiment, the bracket is fixed with one bolt, but it may be fixed with a plurality of bolts. The bracket can also be applied to support cables such as harnesses. The holding portions for hoses and cables may be integrally formed on either one of the two plates.

The invention of the present application can be embodied in a bracket of an internal combustion engine for an automobile. Therefore, it can be used industrially.

1 Cylinder block that constitutes the engine body 4 Auxiliary crankcase 5 Oil pan 6 Front cover 21 Cooling water return pipeline 22 Inlet port 23 First hose (pipes in claim)
24 Three-way joint 25 Second hose (cooling water bottom bypass passage)
26 Third hose (heater return passage)
28 Hose bracket (claim bracket)
29 1st plate 30 2nd plate 31 Fastening bolt 32 Fixing piece 36 Clip as an example of holding part 45 Auxiliary drive belt

Claims (1)

It has an engine body arranged in the engine room of an automobile and a bracket arranged so as to project from the lower surface of the engine body to support pipes or cables at the tip , and the bracket is from the front wheel of the automobile. Is an internal combustion engine for automobiles, which is arranged at a rear position and so as to cover the pipes or cables from the outside in the vehicle width direction.
The bracket comprises a first plate and a second plate joined so as to intersect in a T-shaped or L-shaped cross section, and is bolted to the base end of the first plate and to the surface of the engine body. While the fixed piece to be formed is bent, a holding portion for the pipes or cables is provided at the tip of the first plate or the second plate.
Further , the first plate and the second plate of the bracket have both front and back surfaces inclined to each other with respect to the perpendicular line of the fixed piece, or are in a twisted posture around the longitudinal axis of both plates. ,
Internal combustion engine for automobiles.

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