JP7200696B2 - Mounting structure of auto tensioner for vehicle internal combustion engine - Google Patents

Description

The present invention relates to a mounting structure for an auto tensioner for a vehicle internal combustion engine.

2. Description of the Related Art Conventionally, the structure described in Patent Document 1 is known as a mounting structure for an auto tensioner for an internal combustion engine for a vehicle. In Patent Document 1, an accessory mounting bracket fixed to an engine body is integrally provided with a cylindrical case of an oil filter extending from a mounting surface on which an auto tensioner is mounted, and is integrally provided with the cylindrical case. The mounting boss supports an idler pulley that guides an endless belt that drives the accessories. As a result, the device described in Patent Document 1 can improve the mounting rigidity of the idler pulley that guides the endless belt that drives the accessory of the engine.

Japanese Patent Application Laid-Open No. 2003-148161

By the way, if the accessory is a motor-generator, it is conceivable to attach an auto tensioner to the motor-generator to prevent slackness of the belt.

At this time, if the mounting rigidity of the auto tensioner to the motor generator is low, there is a problem that the vibration of the auto tensioner increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an auto-tensioner mounting structure for an internal combustion engine for a vehicle, which is capable of improving the mounting rigidity of the auto-tensioner to the motor-generator. and

In order to achieve the above object, the present invention provides an engine body having a crank pulley, a motor-generator disposed on the side of the engine body and having a first pulley, a first pulley disposed below the motor-generator, and a first pulley. an auxiliary machine having two pulleys; a belt wound around the crank pulley, the first pulley, and the second pulley; and an auto tensioner for adjusting tension of the belt, wherein the auto tensioner is electrically driven. a base portion fixed to a generator, an arm portion swingably supported by the base portion, a tensioner pulley provided at a swing tip of the arm portion and in contact with the belt near the first pulley; , wherein the motor-generator includes a cylindrical housing portion extending in the axial direction of the rotation shaft of the first pulley, and an inner circumference of the belt extending from the housing portion. a lower arm portion that extends toward the crank pulley and is fastened to the engine body by a fastening member; the auto tensioner includes a first mounting piece that extends laterally from the base portion; a second mounting piece extending upward from the When an imaginary line that is arranged above the base and connects the axis of the rotation shaft of the first pulley and the axis of the fastening member is projected onto the lower arm, the lower arm is aligned with the imaginary line the width of the first portion positioned on the side of the first mounting piece with respect to the imaginary line is formed wider than the width of the second portion positioned on the side opposite to the first portion with respect to the imaginary line Characterized by

As described above, according to the present invention, the mounting rigidity of the auto tensioner to the motor generator can be improved.

FIG. 1 is a right side view of a vehicle internal combustion engine according to one embodiment of the present invention. FIG. 2 is a perspective view of a vehicle internal combustion engine according to one embodiment of the present invention. FIG. 3 is a perspective view of a motor generator and an auto tensioner according to one embodiment of the present invention. FIG. 4 is a right side view of a motor generator and an auto tensioner according to one embodiment of the present invention. FIG. 5 is a front view of a motor generator and an auto tensioner according to one embodiment of the present invention. FIG. 6 is a left rear view of a motor generator and an auto tensioner according to one embodiment of the present invention. FIG. 7 is a perspective view of a tensioner according to one embodiment of the invention.

An auto-tensioner mounting structure for a vehicle internal combustion engine according to an embodiment of the present invention includes an engine body having a crank pulley, a motor-generator disposed on the side of the engine body and having a first pulley, and a motor-generator. An auxiliary machine arranged below the machine and having a second pulley, a belt wound around the crank pulley, the first pulley and the second pulley, and an auto tensioner for adjusting the tension of the belt, wherein the auto tensioner is , a base portion fixed to the motor generator, an arm portion oscillatably supported by the base portion, and a tensioner pulley provided at the oscillating tip of the arm portion and in contact with the belt in the vicinity of the first pulley. In a mounting structure for an auto tensioner of an internal combustion engine for a vehicle, the electric motor generator includes a cylindrical housing portion extending in the axial direction of the rotating shaft of the first pulley, and the housing portion extending toward the inner peripheral side of the belt and approaching the crank pulley. The auto tensioner has a first attachment piece extending laterally from the base and a second attachment piece extending upward from the base. The tensioner pulley is fixed to the lower arm portion by the first mounting piece and fixed to the housing portion by the second mounting piece, and the tensioner pulley is arranged above the base portion and is aligned with the axis of the rotation shaft of the first pulley. When the imaginary line connecting the axial center of the fastening member is projected onto the lower arm portion, the width of the first portion of the lower arm portion located on the side of the first attachment piece with respect to the imaginary line On the other hand, the width of the second portion located on the opposite side of the first portion is wider than that of the second portion. As a result, the auto tensioner mounting structure for a vehicle internal combustion engine according to the embodiment of the present invention can improve the mounting rigidity of the auto tensioner with respect to the motor generator.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an auto tensioner mounting structure for a vehicle internal combustion engine according to the present invention will be described below with reference to the drawings.

1 to 7 are diagrams showing a mounting structure of an auto tensioner for a vehicle internal combustion engine according to one embodiment of the present invention. 1 to 7, the vertical, front, rear, left, and right directions are the width direction of the vehicle, and the height direction of the vehicle, when the direction in which the vehicle travels is the front, and the direction in which the vehicle moves backward is the rear.
First, the configuration will be explained.

1 and 2, an engine 7 as a vehicle internal combustion engine is connected to a transmission (not shown). The engine 7 and the transmission are arranged side by side in the vehicle width direction (horizontal direction) of the vehicle (not shown). The engine 7 converts thermal energy into mechanical energy, and the transmission changes the rotation speed of the engine 7 and outputs it.

The engine 7 has an engine body 9 , and the engine body 9 has a cylinder block 11 , a cylinder head 12 , a cylinder head cover 13 and an oil pan 14 .

The cylinder block 11 is provided with a plurality of cylinders (not shown). The cylinders are arranged in a row in the vehicle width direction. A piston (not shown) is accommodated in the cylinder, and the piston reciprocates vertically with respect to the cylinder.

The piston is connected to the crankshaft 15 via a connecting rod (not shown), and reciprocating motion of the piston is converted into rotational motion of the crankshaft 15 via the connecting rod.

The crankshaft 15 extends in the same direction as the direction in which the cylinders are arranged. Thus, the engine 7 is configured as a transverse engine.

A valve gear chamber (not shown) is formed between the cylinder head 12 and the cylinder head cover 13, and the valve gear chamber accommodates an exhaust camshaft and an intake camshaft (not shown). The timing chain connects the crankshaft 15 with the intake camshaft and the exhaust camshaft, and the power of the crankshaft 15 is transmitted to the intake camshaft and the exhaust camshaft via the timing chain.

An exhaust port 11e is opened in the front side portion 12a of the cylinder head 12 . Inside the cylinder head 12, exhaust ports for each cylinder are formed so as to converge toward the exhaust port 11e. In other words, the structure of the exhaust manifold is provided inside the cylinder head 12 .

The oil pan 14 stores oil for lubricating the crankshaft 15, the pistons, and the like.

A motor generator 50 is installed on the front side portion 11 a of the cylinder block 11 and the front side portion 12 a of the cylinder head 12 . The motor-generator 50 is a rotating electric machine having both functions of an electric motor and a generator, and is also called a motor-generator.

The motor generator 50 is fastened to the cylinder head 12 with bolts 18A, and fastened to the cylinder block 11 with bolts 18B.

An auxiliary machine 20 is installed on the front side portion 11 a of the cylinder block 11 below the motor generator 50 . Auxiliary device 20 is, for example, a compressor of an air conditioner. The accessory 20 is fastened to the cylinder block 11 with bolts (not shown).

A chain cover 21 is attached to the right side of the cylinder block 11 and the cylinder head 12 . The chain cover 21 covers a timing chain (not shown) provided at the ends of the cylinder block 11 and the cylinder head 12 . The chain cover 21 is fastened with bolts 18F to the right side of the front sides 11a and 12a.

A crank pulley 15a is provided at the end of the crankshaft 15 on the right side of the chain cover 21 (the left hand side in the paper surface direction of FIG. 2). The motor-generator 50 is provided with a first pulley 50A, and the first pulley 50A is connected to the rotating shaft 50C of the motor-generator 50 .

Auxiliary machine 20 is provided with a second pulley 20 a , and second pulley 20 a is connected to a rotating shaft 20 b of auxiliary machine 20 .

An endless belt 41A is wound around the crank pulley 15a, the first pulley 50A and the second pulley 20a. Power of the crankshaft 15 is transmitted from the crank pulley 15a to the first pulley 50A and the second pulley 20a via the belt 41A. As a result, motor generator 50 generates electric power, and auxiliary machine 20 is driven.

Another belt (not shown) is wound around the crank pulley 15a. The power of the crankshaft 15 is transmitted from the crank pulley 15a to another auxiliary machine (for example, a water pump) via a belt (not shown). This drives other accessories.

The crank pulley 15a is divided in the longitudinal direction with respect to the axial direction (vehicle width direction) of the crankshaft 15, and the belt 41A and the belt (not shown) are respectively wound around the divided crank pulleys 15a. In other words, the belt 41A and the belt (not shown) are installed so as to be displaced in the axial direction of the crankshaft 15 .

Thus, in the engine 7 of the present embodiment, power is transmitted from the engine body 9 to the motor generator 50 and the auxiliary machine 20 via the belt 41A.

The chain cover 21 is provided with a first auto tensioner 43 that adjusts the tension of the belt 41A. The first autotensioner 43 has a bracket 44 , an arm member 45 and a first tensioner pulley 46 .

The bracket 44 is fastened to the chain cover 21 with bolts 18J and 18K. The bracket 44 is bent into an L-shape, and one end 45a of the arm member 45 is rotatably connected to the bent portion of the bracket 44 . This allows the arm member 45 to swing around the bent portion.

A first tensioner pulley 46 is rotatably connected to the other end 45b of the arm member 45, and the first tensioner pulley 46 is in contact with the belt 41A.

The bent portion of the bracket 44 and the pivotal center portion of the arm member 45 are connected by a torsion spring (not shown). The torsion spring biases the arm member 45 in one direction so that the first tensioner pulley 46 presses the belt 41A. As a result, tension is applied to the belt 41A by the first autotensioner 43. As shown in FIG.

In the first auto tensioner 43, when a reaction force is applied from the belt 41A, the arm member 45 swings in the other direction against the urging force of the torsion spring, and the tension of the belt 41A fluctuates due to the torque fluctuation of the engine 7. absorbs fluctuations in

In this manner, the first auto tensioner 43 causes the arm member 45 to swing in one direction and the other direction by the spring force of the torsion spring, so that the first tensioner pulley 46 presses the belt 41A or pulls the belt 41A. The tension of the belt 41A is adjusted by receiving the reaction force of .

The bracket 44 has mounting portions 44B and 44C. The mounting portion 44B is installed near the lower portion of the cylinder head 12 and to the side of the chain cover 21 in the vertical direction, ie, the height direction of the engine 7, and is fastened to the chain cover 21 with bolts 18J.

The mounting portion 44C is installed above the mounting portion 44B and on the front side of the engine body 9 with respect to the mounting portion 44B, and is fastened to the chain cover 21 with bolts 18K.

The motor generator 50 is provided with a second auto tensioner 60 that adjusts the tension of the belt 41A. The second autotensioner 60 constitutes an autotensioner in the present invention. The second autotensioner 60 includes a base portion 61 fixed to the motor-generator 50, an arm portion 62 swingably supported by the base portion 61, and provided at the tip of the arm portion 62 for swinging motion of the first pulley 50A. and a second tensioner pulley 63 which contacts the belt 41A in the vicinity thereof.

As shown in FIGS. 3, 4, 5, and 6, in this embodiment, the motor-generator 50 includes a cylindrical housing portion 51 extending in the axial direction of the rotation shaft 50C of the first pulley 50A, and a housing portion It has a lower arm portion 53 that extends from 51 toward the inner periphery of the belt 41A and in a direction approaching the crank pulley 15a and is fastened to the engine body 9 by a bolt 18B as a fastening member.

The second autotensioner 60 has a first attachment piece 64 extending laterally from the base portion 61 and a second attachment piece 65 extending upward from the base portion 61. The first attachment piece 64 attaches the lower arm to the bolt 18H. While being fixed to the portion 53, the second mounting piece 65 is fixed to the second mounting piece 65 of the housing portion 51 with a bolt 18H. The second tensioner pulley 63 is arranged above the base portion 61 .

Further, when an imaginary line 53L connecting the axis of the rotation shaft 50C of the first pulley 50A and the axis of the bolt 18B as a fastening member is projected onto the lower arm portion 53, the lower arm portion 53 is projected on the imaginary line 53L. The width of the first portion 53A located on the side of the first mounting piece 64 with respect to the virtual line 53L is formed wider than the width of the second portion 53B located on the side opposite to the first portion 53A with respect to the imaginary line 53L. .

In this embodiment, the first portion 53A of the lower arm portion 53 has the first attachment portion 54 to which the first attachment piece 64 is fixed, and the first attachment portion 54 is the edge portion of the lower arm portion 53. to the second auto tensioner 60 side.

In this embodiment, a plurality of first reinforcing ribs 51A extending radially outward from the radially center portion of the housing portion 51 are provided at the axial end of the housing portion 51 on the side of the first pulley 50A. One of the first reinforcing ribs 51A is connected to the lower arm portion 53. As shown in FIG.

Four pairs of first reinforcing ribs 51A extending substantially parallel to each other are provided at the axial end of the housing portion 51 on the side of the first pulley 50A. It is separated from another pair of adjacent first reinforcing ribs 51A by an angle of 90 degrees. In other words, one pair of first reinforcing ribs 51A is orthogonal to another pair of first reinforcing ribs 51A adjacent in the circumferential direction.

In this embodiment, the edge of the second portion 53B of the lower arm portion 53 has a housing portion extending outward from the first mounting piece 64 in the radial direction of the housing and along the outer edge of the lower arm portion 53. A second reinforcing rib 55</b>A that curves in the circumferential direction of 51 and extends to the first mounting portion 54 is arranged.

The motor-generator 50 has an upper arm portion 52 projecting radially outward and upward from the outer peripheral portion of the housing portion 51 . The upper arm portion 52 is fixed to an upper bracket 71 provided on the front portion 12 a of the cylinder head 12 of the engine body 9 .

The lower arm portion 53 is fixed to a lower bracket 72 provided on the front portion 11a of the cylinder block 11 of the engine body 9 with bolts 18B. The first attachment portion 54 is connected to the lower portion of the lower arm portion 53 .

The arm portion 62 of the second autotensioner 60 is supported so as to be capable of swinging around the swing center axis 62C of the base portion 61 .

A second reinforcing rib 53C extending radially outward of the housing portion 51 from the first reinforcing rib 51A and facing the first mounting piece 64 in the circumferential direction of the housing portion 51 is formed on the outer edge portion of the first mounting portion 54. is provided.

The length of the first attachment piece 64 is shorter than the length of the second attachment piece 65 . Furthermore, the second mounting piece 65 is fixed to the housing portion 51 above the axial center of the rotating shaft 63C of the second tensioner pulley 63 .

As shown in FIG. 7, the first mounting piece 64 and the second mounting piece 65 have inner reinforcing ribs 64A, 65A and outer reinforcing ribs 64B, 65B as third reinforcing ribs extending in the circumferential direction of the housing portion 51. As shown in FIG. The inner reinforcing rib 65A and the outer reinforcing rib 65B extend in a direction substantially perpendicular to the first reinforcing rib 51A.

Ridgelines 64BL and 65BL of the outer reinforcing ribs 64B and 65B and ridgelines 64AL and 65AL of the inner reinforcing ribs 64A and 65A are arranged from the base portion 61 toward the distal ends of the first mounting piece 64 and the second mounting piece 65, respectively. 64 and the second mounting piece 65 are inclined. Also, the ridgelines of the outer reinforcing ribs 64B, 65B are gently inclined compared to the ridgelines of the inner reinforcing ribs 64A, 65A.

Next, the action will be explained. As shown in FIG. 1, crank pulley 15a rotates clockwise to drive motor generator 50 and accessory 20 via belt 41A. The belt 41A extends downward from the first pulley 50A toward the second pulley 20a. It contacts the belt 41A from the outside in the vicinity of the pulley 50A and applies tension to the belt 41A. As a result, the belt 41A is bent inward, and a load (reaction force) acts on the second tensioner pulley 63 of the second auto tensioner 60 from the belt 41A toward the outside of the belt 41A.

In this embodiment, the motor-generator 50 includes a cylindrical housing portion 51 extending in the axial direction of the rotating shaft 50C of the first pulley 50A, and a housing portion 51 extending from the housing portion 51 toward the inner circumference of the belt 41A and toward the crank pulley 15a. and a lower arm portion 53 that extends and is fastened to the engine body 9 by a fastening member.

The second autotensioner 60 has a first attachment piece 64 extending laterally from the base portion 61 and a second attachment piece 65 extending upward from the base portion 61 . While being fixed, it is fixed to the housing portion 51 by the second mounting piece 65 . The second tensioner pulley 63 is arranged above the base portion 61 .

Further, when an imaginary line 53L that connects the axis of the rotation shaft 50C of the first pulley 50A and the axis of the fastening member is projected onto the lower arm portion 53, the lower arm portion 53 is positioned at a distance The width of the first portion 53A located on the one mounting piece 64 side is formed wider than the width of the second portion 53B located on the side opposite to the first portion 53A with respect to the virtual line 53L.

Since the width of the first portion 53A is formed wider than the width of the second portion 53B in this way, the first portion 53A of the lower arm portion 53 can be brought closer to the second autotensioner 60, The rigidity of 1 part 53A can be improved. Therefore, the mounting rigidity of the second autotensioner 60 to the lower arm portion 53 can be improved. Therefore, the mounting rigidity of the second autotensioner 60 to the motor generator 50 can be improved, and vibration of the second autotensioner 60 can be suppressed.

In this embodiment, the first portion 53A of the lower arm portion 53 has the first attachment portion 54 to which the first attachment piece 64 is fixed, and the first attachment portion 54 is the edge portion of the lower arm portion 53. to the second auto tensioner 60 side.

As a result, the first mounting portion 54 can be brought closer to the second autotensioner 60, and the length of the first mounting piece 64 can be shortened. can be done.

In this embodiment, a plurality of first reinforcing ribs 51A extending radially outward from the radially center portion of the housing portion 51 are provided at the axial end of the housing portion 51 on the side of the first pulley 50A. One of the reinforcing ribs is connected to the lower arm portion 53 .

In this manner, one of the plurality of first reinforcing ribs 51A extending radially outward from the radial center portion of the housing portion 51 is connected to the lower arm portion 53, so that the first mounting portion 54 is connected. Therefore, the rigidity of the lower arm portion 53 can be improved, and the mounting rigidity of the second autotensioner 60 to the lower arm portion 53 can be improved.

In this embodiment, the edge of the second portion 53B of the lower arm portion 53 has a housing portion extending outward from the first mounting piece 64 in the radial direction of the housing and along the outer edge of the lower arm portion 53. A second reinforcing rib 55</b>A that curves in the circumferential direction of 51 and extends to the first mounting portion 54 is arranged.

As a result, the rigidity of the lower arm portion 53 to which the first mounting portion 54 is connected can be improved by the second reinforcing rib 55A, and the mounting rigidity of the second autotensioner 60 to the lower arm portion 53 can be improved.

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

7 Engine (vehicle internal combustion engine) 9 Engine body 15a Crank pulley 20 Auxiliary machine 20a Second pulley 20b Rotating shaft 41A Belt 50 Motor generator 50A First Pulley 50C Rotating shaft 51 Housing portion 51A First reinforcing rib (reinforcing rib) 53A First portion 53B Second portion 53L Virtual line 54 First mounting portion (mounting portion) , 55... Second attachment portion (attachment portion), 55A... Second reinforcing rib, 60... Second auto tensioner, 61... Base portion, 62... Arm portion, 63... Second tensioner pulley (tensioner pulley), 63C... Rotating shaft , 64... First attachment piece (attachment piece), 65... Second attachment piece (attachment piece)

Claims (4)

an engine body having a crank pulley;
a motor generator disposed on the side of the engine body and having a first pulley;
an auxiliary machine disposed below the motor generator and having a second pulley;
a belt wound around the crank pulley, the first pulley, and the second pulley;
and an auto tensioner that adjusts the tension of the belt,
The auto tensioner includes a base portion fixed to the motor generator, an arm portion swingably supported by the base portion, and a swing tip end of the arm portion. A mounting structure for an auto tensioner for a vehicle internal combustion engine, comprising:
The electric motor-generator includes a cylindrical housing portion extending in the axial direction of the rotation shaft of the first pulley, and an inner circumferential side of the belt extending from the housing portion in a direction approaching the crank pulley, and is connected to the engine by a fastening member. and a lower arm portion fastened to the main body,
The auto tensioner has a first attachment piece extending laterally from the base portion and a second attachment piece extending upward from the base portion, and is fixed to the lower arm portion by the first attachment piece. , fixed to the housing portion by the second mounting piece,
The tensioner pulley is arranged above the base,
When an imaginary line connecting the axis of the rotation shaft of the first pulley and the axis of the fastening member is projected onto the lower arm, the lower arm is positioned relative to the imaginary line. A vehicle internal combustion engine, wherein a width of a first portion located on one side is formed wider than a width of a second portion located on the opposite side of the imaginary line from the first portion. auto tensioner mounting structure. the first portion of the lower arm portion has a first mounting portion to which the first mounting piece is fixed;
2. The mounting structure for an auto tensioner of an internal combustion engine for a vehicle according to claim 1, wherein the first mounting portion protrudes toward the auto tensioner from an edge portion of the lower arm portion. A plurality of reinforcing ribs extending radially outward from a radially center portion of the housing portion are provided at the end portion of the housing portion on the first pulley side in the axial direction,
3. The mounting structure of an auto tensioner for a vehicle internal combustion engine according to claim 2, wherein one of said plurality of reinforcing ribs is connected to said lower arm portion. When the reinforcing rib is the first reinforcing rib, the edge portion of the second portion of the lower arm portion extends outward from the first mounting piece in the radial direction of the housing and has a lower side portion. 4. A vehicle internal combustion engine according to claim 3, wherein a second reinforcing rib is arranged along the outer end of the arm portion so as to curve in the circumferential direction of the housing portion and extend to the first mounting portion. Auto tensioner mounting structure.

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