JP6258750B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine for a vehicle or the like, and more particularly to an internal combustion engine characterized by an auxiliary machine mounting structure.

  BACKGROUND ART An internal combustion engine for a vehicle includes auxiliary machines such as a generator, a water pump, and an air conditioner compressor, and these auxiliary machines are driven by a belt wound around a crank pulley. The auxiliary machine is generally attached to a cylinder block, a front cover, or a cylinder head via a bracket.

  As an example, in Patent Document 1, as a power steering pump mounting structure, the bracket is configured to overlap one side of the cylinder block and the outer surface of the front cover, and this bracket is fixed to the cylinder block and the front cover with bolts having different postures. Thus, it is disclosed that a power steering pump is fixed to a bracket. Naturally, the rotation shaft of the power steering pump is parallel to the crankshaft, and the pulley of the power steering pump is located outside the front cover.

JP 2001-193473 A

  In Patent Document 1, since the bracket is fixed to the cylinder block and the front cover with bolts having different directions, it acts on the pulley via the belt as compared with the case where the bracket is fixed only to the cylinder block or only to the front cover. Demonstrates high resistance to tensile force. That is, it can be said that the mounting strength is superior as compared with the case of fixing only to the cylinder block or only to the front cover.

  However, since the bracket of Patent Document 1 goes around the front cover from the outside, there is a problem that the bracket is enlarged. In addition, since a part of the bracket is located outside the front cover, the pulley must be disposed outside the bracket, and there is a problem in that a gap between the pulley and the front cover is widened. That is, due to the fact that the bracket is provided, a dead space is generated between the crank pulley and the front cover, which may increase the size of the engine.

  The present invention has been made to improve the current situation.

The present invention, from the "serial Ndabu lock and a front cover fixed to one end surface of the cylinder head is protruded at one end portion of the crank shaft, while the crank pulley is fixed to one end of said crankshaft, said cylinder block An auxiliary machine driven by the crank pulley is disposed outside one side surface that is long in the axial direction of the crankshaft so that its rotating shaft extends in parallel with the crankshaft. head and front cover, or the are Tsu支in brackets on which is fixed to the cylinder block and the front cover "
This is the basic configuration.

And in the above basic configuration,
“ A protruding portion that protrudes in a direction perpendicular to the crankshaft from one side surface of the cylinder head or cylinder block is formed at a height position where at least the upper bracket is disposed in the front cover . While the protruding portion has an inner surface exposed on one side of the cylinder head or cylinder block,
The upper bracket is fixed to the cylinder head or the cylinder block with a first bolt oriented in a direction orthogonal to the crankshaft, and on the inner surface of the protruding portion of the front cover with a second bolt parallel to the crankshaft. The first bolt and the second bolt are different in height so that the first bolt is on the top and the second bolt is on the bottom.
It is the composition.

In the present invention, since the upper bracket is fixed to the cylinder head or the cylinder block and the front cover with bolts having different postures, the upper bracket exhibits high fixing strength. The upper bracket is disposed in a portion sandwiched between the cylinder head or the cylinder block and the front cover, it is similar in appearance and only configurations superimposed on one side of the cylinder head or cylinder block, bulky There is no, and it can be made compact.

  In addition, the upper bracket can be made compact to prevent elastic deformation, and the upper bracket fits into the space surrounded by the protruding portion of the front cover and the cylinder head or cylinder block. Since the integrity of the head or cylinder block, the upper bracket and the front cover is remarkably increased, the mounting strength can be remarkably improved. Therefore, the structure is strong against torsion, and even an auxiliary machine that is large and that has a heavy load on the pulley, such as a motor generator, can be stably suspended.

  Furthermore, since the upper bracket has entered inside the front cover, the pulley of the auxiliary machine can be brought close to the outer surface of the front cover. As a result, the generation of dead space can be prevented and the engine can be made compact.

1 is an overall schematic front view of an embodiment. It is a perspective view of a front cover. It is a schematic plan view. (A) is a cross-sectional plan view of the crank pulley, (B) is a cross-sectional plan view of the water pump pulley, and (C) is a cross-sectional plan view of the idle pulley. It is the front view which looked at the pendulum type auto tensioner from the rotation axis direction. FIG. 6 is a side view taken along the line VI-VI in FIG. 5. It is an isolation | separation top view which shows the attachment means of a motor generator. (A) is a cross-sectional view taken along the line VIII-VIII of FIG. 3, (B) is a cross-sectional view taken along the line BB of (A), and (C) is a cross-sectional view taken along the line CC of (A). FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. It is a front view which shows the modification of an upper bracket.

(1). Outline Next, an embodiment of the present invention will be described with reference to the drawings. First, an outline will be described based on FIGS. In the following description, the front / rear / left / right terms are used to specify the direction. The front / rear direction is the direction of the crank axis O1, and the left / right direction is a direction orthogonal to the cylinder axis O2 and the crank axis O1. In the internal combustion engine of the embodiment, the cylinder axis O2 is slightly inclined (slant) with respect to the vertical line O3, but in the figure, the cylinder axis O2 is displayed in a vertical posture for convenience. .

  The basic configuration of the internal combustion engine is the same as the conventional one. The engine body 1 is fixed with a cylinder block 2 and a cylinder head 3 fixed to the upper surface thereof as main elements, and a number of bolts 4 at one end face thereof. A front cover (chain cover, chain case) 5 is provided. A head cover 6 is fixed to the upper surface of the cylinder head 3, and an oil pan 7 is fixed to the lower surface of the cylinder block 2.

  One end of the crankshaft 8 protrudes outside the front cover 5, while a motor generator (ISG) 10 is disposed on the left side of the engine body 1 in front view, and an air conditioner compressor 10 is disposed on the right side. ing. In addition, a water pump 11 is disposed in a portion of the front cover 5 that is substantially in the middle of the upper and lower sides and on the left side.

  The motor generator 9 is fixed to the cylinder head 3 and the front cover 5 via upper and lower brackets (details will be described later), and the air conditioner compressor 10 is connected to the cylinder block 2 (or / and the front cover via brackets not shown). It is fixed to 5).

  The water pump 11 also serves as a pump housing for the front cover 5, and the water pump 11 is configured by fixing a pump cover 12 (see FIG. 1) to the front cover 5. Therefore, the front cover 5 has a pump chamber 13 (see FIG. 2). The back side of the pump chamber 13 is closed by the cylinder block 2. Therefore, to be exact, the cylinder block 2 is also a component of the water pump 11.

  The motor generator 9, the air conditioner compressor 10, and the water pump 11 include pulleys 15, 16, and 17 fixed to the rotation shaft, respectively, and the first belt 19 is connected to the pulley 15 and the first crank pulley 18 of the motor generator 9. Is wound around the pulley 16 and the second crank pulley 20 of the compressor 10 for the air conditioner, and the third belt 23 is wound around the pulley 17 and the third crank pulley 22 of the water pump 11. It is wrapped around. The first crank pulley 18 and the second crank pulley 20 have substantially the same diameter, and the pulley 15 of the motor generator 9 has an outer diameter that is substantially half that of the first crank pulley 18.

A portion of the first crank pulley 18 near the pulley 15 of the motor generator 9 is sandwiched between two tension pulleys 29 in a pendulum type auto tensioner 28. In this case, in order for the auto tensioner 28 to function, the first crank pulley 18 needs to expand as it moves away from the pulley 15 of the motor generator 9, and therefore, in order to ensure the expansion angle of the first crank pulley 18, attach the idle pulley 30 on the upper side of the U Otaponpu 11 of the cover 5. Therefore, the water pump 11 is disposed in an area surrounded by the first belt 19. The pulley 20 of the air conditioner compressor 10 has a slightly smaller diameter than the second crank pulley 20.

  In the present embodiment, the oil pump also uses a part of the front cover 5 as a housing. For this reason, the front cover 5 is provided with a pump chamber 31 into which a rotor driven by the crankshaft 8 is fitted. ing. Further, a filter mounting seat 33 to which the oil filter 32 can be attached and detached from below is integrally formed at the lower right end of the front cover 5.

(2). Details of Main Parts Next, details of each part related to the present invention will be described. As shown in FIGS. 3 and 4, a first crank pulley 18 and the second crank pulley 20 and the third crank pulley 22 is formed on one body, closer to the first crank pulley 18 and most front cover 5 first The third crank pulley 22 is farthest from the front cover 5, and the second crank pulley 20 is located between the two. The three crank pulleys 18 , 20 , 22 are fixed to one end of the crankshaft 8 with bolts 35.

The belts 19 , 21 and 23 have a concave-convex cross section. For this reason, the belts 19 , 21, 23 are also provided on the outer peripheral surfaces of the crank pulleys 18, 20, 22 and the pulleys 15, 16, 17 of the auxiliary machines. A groove 36 into which is fitted is formed. As a feature of the present embodiment, the groove widths of the belts 19, 21, and 23 are such that the first belt 19 is wider than the second belt 21, and the second belt 21 is wider than the third belt 23. Accordingly, the crank pulleys 18, 20, 22 and the pulleys 15, 16, 17 of the auxiliary machines have different width dimensions according to the widths of the belts 19, 21, 23.

  As shown in FIG. 4B, a disc portion 17 a is formed integrally with the pulley 17 of the water pump 11, and a cylindrical portion 17 b provided on the disc portion 17 a is fixed to the rotating shaft 37. On the other hand, as shown in FIG. 4C, the idle pulley 30 is attached to a boss 38 provided on the front cover 5 with a bolt 40 via a ball bearing 39, and the bolt 40 is also used as a central axis. At the same time, the inner race of the ball bearing 39 is pressed and fixed to the boss 38 with a bolt 40. Of course, a spacer having a central cylinder into which the ball bearing 39 is fitted may be placed on the front cover 5.

  As shown in FIGS. 5 and 6, the auto tensioner 28 has a disk-like base 41 on which the pulley 15 of the motor generator 9 is loosely fitted, and two arms 42 on which the tension pulley 29 is rotatably held. In addition, the two arms 42 are rotatably connected to the base 41 so that the tension pulley 29 can move far and away, and the two arms 42 are biased in a direction approaching each other by a substantially U-shaped spring 43. ing. The two arms 42 are attached to the base 41 so as to turn around the axis of the base 41 while rotating around the base.

  Therefore, the two tension pulleys 29 can rotate around the axis of the base 41 together with the spring 43 and can move independently of each other by deforming the spring 43. A plurality (three) of cylindrical foot portions 44 are provided in a portion of the base 41 opposite to the tension pulley 29, and the foot portions 44 are fixed to the outer surface of the motor generator 9 with bolts (not shown). Has been. The foot portion 44 is fixed to a top bracket plate 45 indicated by a one-dot chain line in FIG. The top bracket plate 45 is connected to the rear bracket plate 46 and the reinforcing rod 47.

  In the present embodiment, the auto tensioner 28 is set so that the shaft center 48 of the base 41 is separated from the front cover 5 by a slight dimension E from the shaft center 49 of the pulley 15 in the motor generator 9 in a front view. .

  Next, the mounting structure of the motor generator 9 will be described mainly based on FIGS. The motor generator 9 is fixed (suspended) to the cylinder head 3 and the front cover 5 via an upper bracket 51 and is fixed to the cylinder block 2 via first and second lower brackets 52 and 53. Yes.

The upper bracket 51 is a cast article or a die-cast product, and has a shape that is narrowed in a side view, and an upper end portion is fastened to a protrusion 54 that protrudes from one side surface 3 a of the cylinder head 3 with a first upper bolt 55. ing. The first upper bolt 55 is the first bolt described in the claims. In FIG. 8, the upper bracket 51 has a mountain shape that is equally inclined from the apex to the left and right sides. However, as shown in FIG. 10, the surface facing the front cover 5 is a vertical surface (a surface parallel to the cylinder axis). It may be made.

The front cover 5, that have a protruding portion 56 that protrudes outwardly disposed from one side 3a of the cylinder head 3. What slave, the protruding portion 56 has an inner surface that is exposed to the side of one side surface 3a of the cylinder head 3 (back surface) 56a. The upper bracket 51 is provided with a boss portion 57 that overlaps the inner surface 56 a of the protruding portion 56 in the front cover 5, and the overhanging portion 56 and the boss portion 57 of the front cover 5 are connected to the second upper surface parallel to the crankshaft 8. Fastened with bolts 58. The second upper bolt 58 is the second bolt described in the claims.
Therefore, the upper bracket 51 is fixed to the cylinder head 3 and the front cover 5 by two upper bolts 55 and 58 whose postures are orthogonal to each other . The first upper bolt 55 and the second upper bolt 58 are The height is different so that the first upper bolt 55 is on the top and the second upper bolt 58 is on the bottom. In the case of the form of FIG. 10, the entire side surface of the upper bracket 51 can be fixed to the protruding portion 56 of the front cover 5.

  At the lower end of the upper bracket 51, a cylinder portion 51 a that fits between the front and rear upper ribs 59 provided on the casing of the motor generator 9 is provided, and the cylinder portion 51 is connected to the upper rib 59 by the third upper bolt 60 and the nut 61. It is concluded to. In this case, the nut 61 is non-rotatably fitted in a hexagon hole 62 provided in the upper rib 59 on the back side. Therefore, when attaching, it is only necessary to screw the third upper bolt 60.

  The first lower bracket 52 is in the form of a link in which the upper and lower cylinders 63 are fixed to the front and rear end plates 64, and the upper part is sandwiched between the front and rear support protrusions 65 provided on the cylinder block 2. The first lower bolt 66 and the nut 67 are fixed to 65. Further, the lower end of the first lower bracket 52 is sandwiched between front and rear lower ribs 67 provided in the casing of the motor generator 9.

  On the other hand, the second lower bracket 53 is made of sheet metal, and has a base portion 53a that overlaps one side surface 2a of the cylinder block 2 and an arm portion 53b that protrudes laterally from the base portion 53b. The base portion 53a is the second lower portion 53a. The bolt 68 is fastened to the cylinder block 2.

On the other hand, the front and rear lower ribs 67 of the motor generator 9 are sandwiched from the outside by the arm portion 53b, and the front and rear arm portions 53b of the second lower bracket 53, the front and rear second lower ribs 67, and the first lower bracket 52 are third lower. The bolts 69 and nuts 70 are tightened together. The first lower bracket 52 may be in a state in which the first lower bracket 52 is allowed to rotate with respect to the front and rear lower ribs 67.

(3) Summary The motor generator 9 is acted on by a force to be attracted to the cylinder block 2 and a force to be separated from the cylinder block 2 by driving as a generator and driving as a motor. Further, since the pulley 15 of the motor generator 9 protrudes from the mounting portion of the motor generator 9 with respect to the engine body 1 (the parts of the upper and lower brackets 51 to 53), the motor generator 9 is driven by the drive of the first crank pulley 18. An external force (moment) that twists in a plan view also acts.

  However, in the present embodiment, first, the upper bracket 51 will be described. Since the upper bracket 51 has two side surfaces that are orthogonal to the cylinder head 3 and the front cover 5, the upper bracket 51 is not easily displaced in any of the front, rear, left, and right directions. It exhibits high resistance against twisting and is fastened by two upper bolts 55 and 58 whose postures are orthogonal to each other, so that extremely high fastening strength can be secured.

  More specifically, the load acts on the second upper bolt 58 as an acting force (or bending force) with respect to an external force that attempts to move the upper bracket 51 away from the engine body 1. Compared with the case where only 55 is fastened, the resistance is extremely high (that is, the upper second bolt 58 is not subjected to external force on the thread, but is subjected to external force to bend the shaft, so that the strength is high. Is much better.)

  Further, since the upper bracket 51 is located on the inner side (on the cylinder head 3 side) than the outer surface of the front cover 5, the motor generator 9 can be arranged so that the pulley 15 is as close as possible to the outer surface of the front cover 5. It is possible to contribute to downsizing the engine by preventing the motor generator 9 from protruding, and the first crank pulley 18 can be arranged as close to the outer surface of the front cover 5 as possible, so that the moment acting on the crankshaft 8 can be suppressed. Of course, the moment acting on the motor generator 9 via the first belt 19 can also be suppressed.

Further, the outer periphery of the front cover 5 is fixed to the cylinder head 3 and the cylinder block 2 with bolts 4, and the protruding portion 56 of the front cover 5 has a structure that is extremely difficult to deform even when a load in the front-rear direction is applied. Therefore, the upper bracket 51 can be firmly fixed.

More specifically, the upper bracket 51 has a block shape and is not easily deformed, and the block upper bracket 51 is fixed to the protruding portion 56 of the front cover 5 and the cylinder head 2. The protruding portion 56 of the front cover 5 is in the same state as being fixed to the cylinder head 3 via the upper bracket 51. For this reason, the fixing strength of the upper bracket is remarkably high. Therefore, even the motor generator 9 that is heavy and receives a large load can be stably suspended.

Although the upper bracket 51 also functions to reinforce the front cover 5, the protrusion 56 is located outside the water pump 11 in the longitudinal direction of the second belt 21, so that the water pump 11 is not deformed. There is also an inhibitory effect.

  On the other hand, when describing the lower brackets 52 and 53, the two lower brackets 52 and 53 are also fastened to the cylinder block 2 by bolts 66 and 68 having different postures (perpendicular to each other). Both high external strength and torsion can be exerted and extremely high resistance can be secured.

  In addition, an external force that pushes close to the cylinder block 2 and an external force that separates from the cylinder block 2 are acted on the lower portion of the motor generator 9 by driving as a generator and driving as a motor. Since the third lower bolts 66 and 69 act as resistance by bending stress, high strength can be secured.

  The present invention can be embodied in various ways other than the above-described embodiment. For example, the auxiliary machine fixed using the upper bracket is not limited to the motor generator, and various auxiliary machines such as an alternator can be suspended. The upper bracket can be fixed to the cylinder block and the front cover, or can be fixed to the three of the cylinder block, the cylinder head, and the front cover.

  The present invention can be embodied in an internal combustion engine for a vehicle. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 2 Cylinder block 3 Cylinder head 5 Front cover as an engine main body 9 Motor generator as an example of an auxiliary machine 10 Air conditioner compressor 15 Motor generator pulley 18 First crank pulley (crank pulley of claim)
19 1st belt 51 Upper bracket 52, 53 Lower bracket 54 Projection for fixing the upper bracket on the cylinder head
55 First Upper Bolt ( First Bolt of Claim)
58 Second upper bolt ( second bolt in claims)
56 Protruding part of the front cover
56a Inside surface of the protruding part

Claims (1)

From a fixed front cover to one end face of the silicon Ndabu lock and the cylinder head is protruded at one end portion of the crank shaft, while the crank pulley at one end of the crankshaft is fixed, the axis of the crankshaft of the cylinder block An auxiliary machine driven by the crank pulley is disposed outside one side surface that is long in the direction so that a rotation shaft thereof extends in parallel with the crankshaft, and the auxiliary machine includes the cylinder head and a front cover, or a configuration that is Tsu支in brackets on the fixed to the cylinder block and the front cover,
A protruding portion that protrudes in a direction perpendicular to the crankshaft from one side surface of the cylinder head or cylinder block is formed at least at a height position where the upper bracket is disposed in the front cover , While the protruding portion has an inner surface exposed on one side of the cylinder head or cylinder block,
The upper bracket is fixed to the cylinder head or the cylinder block with a first bolt oriented in a direction orthogonal to the crankshaft, and on the inner surface of the protruding portion of the front cover with a second bolt parallel to the crankshaft. The first bolt and the second bolt are different in height so that the first bolt is located on the upper side and the second bolt is located on the lower side.
Internal combustion engine.

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