JP2015232360A - Internal combustion engine pulley bracket structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine pulley bracket structure capable of preventing the vibration of a pulley bracket attached to an engine body by bolts.SOLUTION: A bolt 18 is attached to an engine body 7 via a pulley bracket 16 so as to face a direction orthogonal to a belt load F acting on an idler pulley 13 from a belt 17, a bolt 19 is attached to the engine body 7 via the pulley bracket 16 so as to face an opposite direction to the belt load F acting on the idler pulley 13 from the belt 17, and the belt load F is caused to act on the bolt 19 in an axial direction, thereby preventing loosening of the bolt 19 with respect to the belt load F.

Description

  The present invention relates to a pulley bracket structure for an internal combustion engine, and more particularly to a pulley bracket structure for an internal combustion engine that supports an idler pulley that applies tension to an endless belt.

  Various auxiliary machines are mounted on an internal combustion engine mounted on a vehicle such as an automobile, and a pulley is attached to the rotation shaft of these auxiliary machines. The pulley is connected to a crankshaft or the like via an endless belt. It is connected to.

  Since the belt needs to secure a sufficient belt wrap angle with respect to the pulley of the auxiliary machine to ensure transmission of the driving force, a constant tension is applied by the idler pulley. Is supported rotatably on the engine body of the internal combustion engine by a pulley bracket.

  As a conventional pulley bracket structure of this type of internal combustion engine, the one described in Patent Document 1 is known. In the pulley bracket structure described in Patent Document 1, an idler pulley that applies tension to the belt is rotatably attached to the pulley bracket. The pulley bracket is fastened to the same wall surface of the cylinder block by a plurality of bolts. Yes.

  The bolt fastens the pulley bracket to the same wall surface of the cylinder block so as to be perpendicular to the belt load (direction perpendicular to the same wall surface) applied from the belt to the idler pulley.

Japanese Utility Model Publication No. 4-132247

  However, in such a conventional pulley bracket structure of an internal combustion engine, the bolt is attached to the same wall surface of the cylinder block via the pulley bracket so that the direction is perpendicular to the belt load applied from the belt to the idler pulley. Since it is fastened, the belt load applied to the idler pulley acts on the bolt as a shearing force (a load perpendicular to the axial direction of the bolt).

  For this reason, the shearing force applied to the bolt with respect to the frictional force between the bolt and the pulley bracket gives a load in the rotation direction of the bolt, and the fastening force of the bolt may be reduced. As a result, rattling of the pulley bracket occurs with respect to the engine body, and the pulley bracket may vibrate due to vibration of the internal combustion engine.

  The present invention has been made paying attention to the above-described problems, and provides a pulley bracket structure for an internal combustion engine that can prevent a pulley bracket attached to an engine body from vibrating by a bolt. It is the purpose.

  A first aspect of the present invention is a pulley bracket in which a pulley bracket that supports an idler pulley that applies tension to an endless belt stretched over a plurality of accessory pulleys is attached to an engine body of an internal combustion engine by a plurality of bolts. The engine main body through the pulley bracket so that at least one of the plurality of bolts is in a direction orthogonal to the belt load applied to the idler pulley from the endless belt. And at least one second bolt of a plurality of bolts is attached to the engine body via a pulley bracket so as to be in the opposite direction to the belt load.

  As a second aspect of the present invention, the engine body includes a first wall surface facing the idler pulley, and a second wall surface orthogonal to the first wall surface and oriented in a direction orthogonal to the belt load. The pulley bracket includes a base portion that contacts the first wall surface, an extension portion that extends from the base portion in the belt load direction, and a parallel to the second wall surface from the extension direction tip of the extension portion. A bent portion that bends and contacts the second wall surface, and the first bolt is screwed into the first wall surface through the base portion, thereby fastening the base portion and the first wall surface. The bent portion and the second wall surface may be fastened by screwing the second bolt through the bent portion to the second wall surface.

  As a third aspect of the present invention, an attachment boss portion to which the idler pulley is attached and a first reinforcing rib for connecting the attachment boss portion and the vicinity of the attachment seat surface of the first bolt are formed on the base portion. The base portion and the extending portion may be formed with second reinforcing ribs that connect the attachment boss portion and the bending start end of the bending portion.

  As described above, according to the first aspect described above, at least one or more second bolts of the plurality of bolts that fasten the pulley bracket to the engine body are reversed with respect to the belt load applied from the belt to the idler pulley. Since it is attached to the engine body via the pulley bracket so as to be in the direction, the belt load can be applied in the axial direction of the second bolt.

  For this reason, it can prevent that a 2nd bolt loosens with respect to a belt load, and can prevent that the fastening force of the pulley bracket with respect to an engine main body falls. Therefore, it is possible to prevent the pulley bracket from rattling against the engine body, and it is possible to prevent the pulley bracket from vibrating due to the vibration of the internal combustion engine.

  In addition to preventing the second bolt from loosening with respect to the belt load, since the axial direction of the second bolt is orthogonal to the axial direction of the first bolt, the first bolt and the second bolt The pulley bracket can be attached to the engine body from different directions.

  For this reason, the pulley bracket can be firmly attached to the engine body by the first bolt and the second bolt, and the pulley bracket can be stably attached to the engine body over a long period of time.

  According to the second aspect, the first bolt is screwed into the first wall surface of the engine body through the base portion of the pulley bracket, whereby the base portion and the first wall surface are fastened. The bolts are screwed into the second wall surface of the engine body through the bent portions of the pulley bracket, so that the bent portion and the second wall surface are fastened. Therefore, the pulley bracket is fastened to a different surface of the engine body. It is possible to increase the fastening force of the pulley bracket to the engine body.

  For this reason, it is possible to prevent the pulley bracket from vibrating in multiple directions (for example, the vehicle width direction of the engine body, the vehicle longitudinal direction, and the vehicle vertical direction) transmitted from the engine body to the pulley bracket.

  Further, since the axial direction of the second bolt can be orthogonal to the axial direction of the first bolt, the belt load can be reliably applied in the axial direction of the second bolt, and the second load It is possible to more effectively prevent the second bolt from loosening.

According to the third aspect, the first reinforcing rib for connecting the mounting boss formed on the base portion and the vicinity of the mounting seat surface of the first bolt is formed on the base portion. Since the second reinforcing rib that connects the mounting boss portion and the bending start end of the bent portion is formed at the protruding portion, the mounting surface of the first bolt and the first reinforcing rib and the second reinforcing rib The strength of the mounting seat surface of the second bolt can be increased.
For this reason, when the belt load or the vibration of the engine body is transmitted to the pulley bracket, the deformation of the mounting seat surface of the first bolt and the mounting seat surface of the second bolt can be suppressed, and the first bolt and the second bolt It is possible to more effectively prevent the fastening force of the bolts from decreasing.

FIG. 1 is a view showing an embodiment of a pulley bracket structure of an internal combustion engine according to the present invention, and is a side view of the internal combustion engine provided with the pulley bracket. FIG. 2 is a view showing an embodiment of the pulley bracket structure of the internal combustion engine of the present invention, and is a side view of the internal combustion engine around the pulley bracket. FIG. 3 is a view showing an embodiment of the pulley bracket structure of the internal combustion engine of the present invention, and is a view of the pulley bracket as viewed from the rear of the vehicle. FIG. 4 is a view showing an embodiment of the pulley bracket structure of the internal combustion engine of the present invention, and is a perspective view of the pulley bracket attached to the engine body. FIG. 5 is a view showing an embodiment of the pulley bracket structure of the internal combustion engine of the present invention, and is a cross-sectional view taken along the VV direction of FIG.

Embodiments of a pulley bracket structure for an internal combustion engine according to the present invention will be described below with reference to the drawings.
1-5 is a figure which shows the pulley bracket structure of the internal combustion engine of one Embodiment based on this invention.

First, the configuration will be described.
In FIG. 1, an engine room 3 is provided at a front portion of a vehicle body 2 of a vehicle 1, and the engine room 3 is partitioned from a vehicle compartment 5 behind the vehicle 1 by a dash panel 4.

  The engine room 3 accommodates an engine 6 as an internal combustion engine. The engine 6 includes an engine body 7 as an engine body, and the engine body 7 is elastically supported by the vehicle body 2 by a mount member (not shown). ing.

  A plurality of cylinders are formed inside the engine body 7, and pistons (not shown) are provided in the cylinders so as to be capable of reciprocating. A crankshaft 8 is rotatably provided in the engine body 7, and the reciprocating motion of the piston is converted into the rotational motion of the crankshaft 8.

  An intake camshaft and an exhaust camshaft (not shown) on which an intake cam and an exhaust cam (not shown) are attached are rotatably provided in the engine body 7, and an intake valve (not shown) and an exhaust camshaft are respectively rotated by the rotation of the intake cam and the exhaust cam. As the exhaust valve moves up and down, an intake port and an exhaust port (not shown) formed in the engine body 7 are opened and closed.

  Here, although the engine 6 is comprised from the well-known engine which uses liquid and gas fuels, such as a gasoline engine, light oil, LPG, hydrogen, and bi-fuel, it is not specifically limited. Further, there is no particular limitation on the engine arrangement such as vertical installation or horizontal installation, cylinder arrangement such as horizontally opposed or V type, the number of cylinders, and the like.

  A chain case 9 is provided on the right side of the engine body 7 in the vehicle width direction. Between the chain case 9 and the engine body 7, a timing chain (not shown) that connects the intake camshaft, the exhaust camshaft, and the crankshaft 8 is provided. Is provided.

  A water pump pulley 10, a crank pulley 11, a generator pulley 12 and an idler pulley 13 are rotatably provided on the right side of the engine body 7 in the vehicle width direction.

  The water pump pulley 10 is fixed to an input shaft 14 of a water pump (not shown) mounted on the engine body 7 and rotates together with the input shaft 14 to transmit power to the water pump.

The water pump circulates cooling water in a water jacket (not shown) built in the engine body 7 and a radiator (not shown), and cools a portion such as a piston that becomes high temperature by heat exchange.
The crank pulley 11 is fixed to the crankshaft 8 and rotates together with the crankshaft 8.

  The generator pulley 12 is fixed to the input shaft 15 a of the generator 15 attached to the engine body 7, rotates with the input shaft 15 a, and transmits power to the generator 15. The generator 15 rectifies three-phase alternating current generated in a stator (not shown) due to electromagnetic induction by rotation of a rotor (not shown) provided on the input shaft 15a, and charges a battery (not shown).

  The idler pulley 13 is rotatably supported by the engine body 7 by a pulley bracket 16. Here, the water pump pulley 10 and the generator pulley 12 constitute an auxiliary pulley.

  An endless belt 17 is wound around the water pump pulley 10, the crank pulley 11, the generator pulley 12 and the idler pulley 13, and the rotation of the crankshaft 8 is transmitted from the crank pulley 11 to the water pump pulley 10 and the generator pulley 12. As a result, the input shaft 14 of the water pump and the input shaft 15a of the generator 15 rotate.

  The idler pulley 13 is disposed on the input shaft 14 side of the water pump pulley 10 with respect to the straight line L connecting the crankshaft 8 and the input shaft 15a of the generator 15, and the belt 17 is connected to the straight line L. It is close to the portion of the belt 17 located between the water pump pulley 10 and the generator pulley 12. For this reason, the idler pulley 13 can apply a constant tension to the belt 17.

  2 to 5, the pulley bracket 16 is provided with an attachment boss portion 16a for attaching the idler pulley 13 to the pulley bracket 16, and the bolt 20 (see FIG. 1) is passed through the idler pulley 13 to the attachment boss portion 16a. ) Are screwed together. 3 and 5 show a state where the belt 17 is removed.

  Specifically, the idler pulley 13 is provided radially outside the inner cylinder 13A and the inner cylinder 13A, and a belt 17 is wound around the outer end in the radial direction. The idler pulley 13 rotates through a bearing (not shown) on the inner cylinder 13A. The outer cylinder 13B is connected freely (see FIG. 1).

  In the idler pulley 13, the bolt 20 is screwed to the mounting boss portion 16a through the inner cylinder 13A, whereby the inner cylinder 13A is fixed to the pulley bracket 16, and the outer cylinder 13B is rotatable with respect to the inner cylinder 13A. .

  As shown in FIG. 2, the idler pulley 13 applies tension T to the belt 17 in one direction orthogonal to the axis of the bolt 20, so the idler pulley 13 is opposite to the one direction orthogonal to the axis of the bolt 20. A belt load F is applied in the direction. Here, the bolt 20 is hatched in FIG.

  The pulley bracket 16 is attached to the engine body 7 by a bolt 18 constituting a first bolt and a bolt 19 constituting a second bolt. The bolt 18 is attached to the engine body 7 via the pulley bracket 16 so as to be in a direction orthogonal to the belt load F applied to the idler pulley 13 from the belt 17 (width direction of the vehicle 1). The belt body F is attached to the engine body 7 via the pulley bracket 16 so as to be in a direction opposite to the belt load F, in other words, a direction in which the tension T is applied.

  4 and 5, the engine body 7 includes a first wall surface 7 </ b> A that faces the idler pulley 13, and a second wall surface 7 </ b> B that is orthogonal to the first wall surface 7 </ b> A and that faces in the direction orthogonal to the belt load F. The bolt 18 is screwed to the first wall surface 7A, and the bolt 19 is screwed to the second wall surface 7B.

  In FIG. 4, the pulley bracket 16 includes a base portion 16A that contacts the first wall surface 7A, an extension portion 16B that extends from the base portion 16A in the direction of the belt load F, and a distal end of the extension portion 16B in the extension direction. To bend in parallel with the second wall surface 7B and bend in contact with the second wall surface 7B.

  In FIG. 5, an insertion hole 16b through which the bolt 18 is inserted is formed in the base portion 16A, and an insertion hole 16c through which the bolt 19 is inserted is formed in the bent portion 16C.

In the pulley bracket 16, the base 18A and the first wall surface 7A are fastened by screwing the bolt 18 to the first wall surface 7A through the insertion hole 16b, and the bolt 19 is connected to the second wall surface 7B through the insertion hole 16c. The bent portion 16C and the second wall surface 7B are fastened by being screwed together.
As a result, the pulley bracket 16 is fastened to the engine body 7, and the idler pulley 13 is rotatably supported by the engine body 7 via the pulley bracket 16.

  Further, an attachment boss portion 16a to which the idler pulley 13 is attached is formed at the end of the base portion 16A opposite to the extension portion 16B, and the attachment seat surface of the attachment boss portion 16a and the bolt 18 is formed on the base portion 16A. A reinforcing rib 21A is formed as a first reinforcing rib that connects the vicinity of 16d.

  The base portion 16A and the extension portion 16B are formed with a reinforcing rib 21B as a second reinforcing rib that connects the mounting boss portion 16a and the bending start end 16f of the bending portion 16C. Here, the bending start end 16f is a base end of the bending portion 16C where the bending starts from the distal end in the extending direction of the extending portion 16B.

Next, the operation will be described.
According to the pulley bracket structure of the present embodiment, the bolt 18 is attached to the engine body 7 via the pulley bracket 16 so as to be in a direction orthogonal to the belt load F applied from the belt 17 to the idler pulley 13. Is attached to the engine body 7 via the pulley bracket 16 so as to be opposite to the belt load F applied to the idler pulley from the belt 17, the belt load F can be applied in the axial direction of the bolt 19. .

  For this reason, it is possible to prevent the bolt 19 from loosening with respect to the belt load F, and to prevent the fastening force of the pulley bracket 16 with respect to the engine body 7 from decreasing. Therefore, it is possible to prevent the pulley bracket 16 from rattling against the engine body 7 and to prevent the pulley bracket 16 from vibrating due to the vibration of the engine 6.

  Further, in addition to preventing the bolt 19 from loosening with respect to the belt load F, the axial direction of the bolt 19 is orthogonal to the axial direction of the bolt 18, so that the pulley bracket 16 can be moved from different directions depending on the bolt 18 and the bolt 19. It can be attached to the body 7.

  For this reason, the pulley bracket 16 can be firmly attached to the engine body 7 by the bolts 18 and 19, and the pulley bracket 16 can be stably attached to the engine body 7 over a long period of time.

  Further, according to the pulley bracket structure of the present embodiment, the engine body 7 is oriented in a direction perpendicular to the first wall surface 7A facing the idler pulley 13 and the first wall surface 7A and perpendicular to the belt load F. The pulley bracket 16 includes a base portion 16A that is in contact with the first wall surface 7A, and an extension portion 16B that extends from the base portion 16A in the direction of the belt load F. And a bent portion 16C that is bent in parallel with the second wall surface 7B from the front end of the extending portion 16B and contacts the second wall surface 7B.

  Then, the bolt 18 is screwed into the first wall surface 7A of the engine body 7 through the base portion 16A of the pulley bracket 16 to fasten the base portion 16A and the first wall surface 7A, and the bolt 19 is connected to the pulley bracket. Since the bent portion 16C and the second wall surface 7B are fastened by screwing to the second wall surface 7B of the engine body 7 through the 16 bent portions 16C, the pulley bracket 16 is attached to a different surface of the engine body 7. The fastening force of the pulley bracket 16 to the engine body 7 can be increased.

  For this reason, it is possible to prevent the pulley bracket 16 from vibrating in multiple directions transmitted from the engine body 7 to the pulley bracket 16 (for example, the vehicle width direction of the engine body 7, the vehicle longitudinal direction, and the vehicle vertical direction).

  Further, since the axial direction of the bolt 19 can be orthogonal to the axial direction of the bolt 18, the belt load F can be reliably applied in the axial direction of the bolt 19, and the bolt 19 is loosened with respect to the belt load F. Can be more effectively prevented.

  Further, according to the pulley bracket structure of the present embodiment, the reinforcing rib 21A that connects the mounting boss portion 16a formed on the base portion 16A and the vicinity of the mounting seat surface 16d of the bolt 18 is formed on the base portion 16A. Since the reinforcing rib 21B that connects the mounting boss portion 16a and the bending start end 16f of the bent portion 16C is formed on the base portion 16A and the extending portion 16B, the mounting seat surface 16d of the bolt 18 and the bolt are formed by the reinforcing ribs 21A and 21B. The strength of the 19 mounting seat surfaces 16e can be increased.

  For this reason, when the belt load F and the vibration of the engine body 7 are transmitted to the pulley bracket 16, the deformation of the mounting seat surface 16d of the bolt 18 and the mounting seat surface 16e of the bolt 19 can be suppressed. It can prevent more effectively that a fastening force falls.

  In the pulley bracket structure of this embodiment, one bolt 18 is attached to the engine body 7 via the pulley bracket 16 so as to be perpendicular to the belt load F applied from the belt 17 to the idler pulley 13. However, two or more bolts may be attached in this direction.

  Further, since the bolt 19 is attached to the engine body 7 via the pulley bracket 16 so as to be opposite to the belt load F applied from the belt 17 to the idler pulley, the belt load F acts in the axial direction of the bolt 19. Can be made. Two or more bolts may be attached in this direction.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  DESCRIPTION OF SYMBOLS 6 ... Engine (internal combustion engine), 7 ... Engine main body (engine main body), 7A ... First wall surface, 7B ... Wall surface (second wall surface), 10 ... Water pump pulley (auxiliary pulley), 12 ... Generator pulley ( Auxiliary machine pulley), 13 ... idler pulley, 16 ... pulley bracket, 16A ... base portion, 16B ... extended portion, 16C ... bent portion, 16a ... mounting boss portion, 16d ... mounting seat surface (first bolt mounting seat) Surface), 16f ... bending start end, 17 ... belt, 18 ... bolt (first bolt), 19 ... bolt (second bolt), 21A ... reinforcing rib (first reinforcing rib), 21B ... reinforcing rib ( Second reinforcing rib)

Claims (3)

A pulley bracket structure in which a pulley bracket for supporting an idler pulley that applies tension to an endless belt stretched around a plurality of auxiliary machine pulleys is attached to an engine body of an internal combustion engine by a plurality of bolts,
At least one or more first bolts of the plurality of bolts are attached to the engine body via the pulley bracket so as to be in a direction orthogonal to a belt load applied from the belt to the idler pulley,
An internal combustion engine characterized in that at least one or more second bolts of the plurality of bolts are attached to the engine body via the pulley bracket so as to be in a direction opposite to the belt load. Pulley bracket structure. The engine body includes a first wall surface facing the idler pulley, and a second wall surface orthogonal to the first wall surface and facing in a direction orthogonal to the belt load,
The pulley bracket includes a base portion that contacts the first wall surface, an extending portion that extends from the base portion in the belt load direction, and the second wall surface from a distal end in the extending direction of the extending portion. A bent portion that is bent in parallel and is in contact with the second wall surface,
By fastening the first bolt to the first wall surface through the base portion, the base portion and the first wall surface are fastened,
2. The internal combustion engine according to claim 1, wherein the bent portion and the second wall surface are fastened by screwing the second bolt through the bent portion to the second wall surface. Pulley bracket structure. A mounting boss portion to which the idler pulley is mounted, and a first reinforcing rib for connecting the mounting boss portion and the vicinity of the mounting seat surface of the first bolt are formed on the base portion,
The second reinforcing rib for connecting the mounting boss portion and the bending start end of the bent portion is formed on the base portion and the extending portion, respectively. Pulley bracket structure for an internal combustion engine.

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