JP2018103660A - Automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress vibration resulting from the vertical movement of a piston without causing an increase of weight and a time and labor for a layout, in a three-cylinder engine.SOLUTION: A transmission 13 is fixed to one end face (rear face) 2a of an engine main body 2 which is composed of a cylinder block 8, a cylinder head 9, a front cover 12 and the like. An upper end part of the front cover 12 and a tip part of the transmission 13 are supported (pivotally suspended) to a side frame 6 via engine mounts 14, 15 having elastic bodies 16. By arranging a battery 25 at the tip part of the transmission 13, the center of gravity 35 of a power plant composed of the engine main body 2 and the transmission 13 is made to coincide with or approximate a center position 33 between the left and right engine mounts 14, 15. Even if the power plant vertically vibrates due to the vertical movement of the piston 34, a maximum amplitude of the power plant can be reduced, and the vibration of the power plant can be thereby suppressed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an automobile (passenger car) that runs on an engine (internal combustion engine).

  In a passenger car, the engine is generally disposed in an engine room provided at the front of the vehicle body. The engine has an engine body composed of cylinder blocks, cylinder heads, etc., and a timing chain is arranged at one end surface (front end surface) of the engine, and this timing chain is covered with a front cover (chain cover). The transmission is fixed to the other end surface (rear end surface) of the engine body.

  The engine body and the transmission are integrated to form a power plant, and the upper end portion of the front cover and the distal end portion of the transmission are supported by the vehicle body frame via the engine mount. The engine mount has an elastic body such as rubber, and the vibration of the engine is absorbed by the elastic body.

  The number of cylinders of the engine varies, but in the case of a three-cylinder engine, the three pistons move up and down at a phase of 120 degrees, so that the vertical movement of the pistons acts to vibrate the power plant in the vertical direction, In addition, the power plant is rotated around the axis of the crankshaft by the inertial force of the crank arm and balance weight provided on the crankshaft.

  The vertical vibration of the power plant is a movement that rotates up and down like a seesaw with the center of gravity of the power plant as a fulcrum, and this vertical rotation and rotation around the crankshaft are combined into one end and the other end of the power plant. When viewed from the direction of the crankshaft axis, it tends to make a planetary motion around the center of the crankshaft, and the kinetic energy of this power plant appears as vibration. It is inevitable that the power plant will be affected by the planetary movement around the center of the crankshaft, but if the center of gravity of the power plant is in the middle of the two power plants, let the power plant move in a planetary motion. Therefore, the vibration is suppressed to the minimum.

  However, since the transmission is lighter than the engine body, the center of gravity of the power plant is closer to the front cover than the middle position of the two engine mounts. Vibration due to rotation tends to be amplified at the tip of the transmission.

  In some cases, the amplified vibration propagates into the vehicle, causing discomfort to the passenger. In particular, if the engine is placed horizontally with the crank axis line long in the left-right direction of the car body, the influence of the vibration appears strongly because the car body tends to roll left and right due to the vibration of the engine body, It was easy to give the crew a sense of incongruity

  Therefore, a method for suppressing vibration has been studied. As an example, Patent Document 1 discloses that the generation of vibration is suppressed by devising the position and weight of the balance weight provided on the crankshaft. Has been.

Japanese Patent No. 5351977

  Patent Document 1 is intended to eliminate the cause of vibration and is an idea worth listening to. However, since a new balance weight must be provided, there is a problem that the weight of the engine may increase and fuel consumption may deteriorate. Because the crankshaft is greatly modified, the design change may spread to various places and the cost may increase, or if the weight of the engine changes or the weight of the transmission changes, the balance weight changes accordingly. There is a concern that the versatility is inferior because the design must be redesigned.

  A variety of equipment, including auxiliary equipment, is fixed to the engine body, but the design center of these equipment, new installations and abolitions are frequently performed, so the center of gravity of the engine body is not necessarily constant. Therefore, it can be said that the vibration isolation by improving the balance weight is inferior in versatility. There is also a problem that it cannot be applied at all to the engine of the existing specification.

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

  In the present invention, a transmission is fixed to one end face of an engine main body arranged in an engine room so as to protrude in a crank axis direction, and an end of the engine main body opposite to the transmission, In a configuration in which the tip of the transmission opposite to the engine body is supported by the vehicle body frame via an elastic body, a battery is attached to the transmission.

  Since the battery (lead-acid battery) is quite heavy, by fixing it to the transmission, the center of gravity of the power plant consisting of the engine body and transmission is positioned at or near the midpoint of the two engine mounts. be able to. As a result, even if the power plant moves up and down due to the vertical movement of the piston, the maximum amplitude can be reduced. As a result, even if the power plant tries to make a planetary motion around the crankshaft, the maximum turning radius is reduced. be able to. As a result, the force generated when the power plant including the transmission and the engine main body moves up and down and rotates (turns) is remarkably suppressed, and vibrations in the vehicle can also be suppressed.

  Since the battery, which is essential equipment for automobiles, is used as a balance weight for vibration isolation or vibration reduction, there is no increase in weight as an automobile, and therefore fuel consumption does not deteriorate. Moreover, since the structure of the engine itself may be the same as before, there is no problem of cost increase, and it can be readily applied to a car having an existing specification and is excellent in versatility. In addition, when the weight of the transmission changes, the position of the center of gravity can be changed by changing the position of the battery, so that the response to changes in the specifications of the engine body and the transmission is excellent.

  As described above, the vibration due to the vertical movement of the piston is noticeable in the three-cylinder internal combustion engine, and the vibration is likely to appear in the vehicle body when the crankshaft is in the horizontal position with the left and right longitudinal postures. When applied to a car in which a three-cylinder engine is placed horizontally, the effect is remarkably exhibited.

It is a typical top view of an engine room. It is the typical front view which looked at FIG. 1 from the II-II viewing direction. It is the fragmentary sectional view which looked at the battery from the II-II view direction of FIG.

  Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, an engine room 2 is formed at the front of the vehicle body 1, and the engine body 3 of the three-cylinder engine is placed in the engine room 2 in a horizontal position with the crank axis O directed in the left-right direction of the vehicle body 1. Is arranged in. The vehicle body 1 has a vehicle body frame 4 that constitutes an outer peripheral portion thereof, and the vehicle body frame 4 has a front frame 5 and a side frame 6, both of which are connected in series. In addition, the code | symbol 7 shown in FIG. 1 is a bumper.

  As shown in FIG. 2, the engine body 3 includes an oil pan 10 fixed to the lower surface of the cylinder block 8, a head cover 11 fixed to the upper surface of the cylinder head 9, with the cylinder block 8 and the cylinder head 9 as core members. A front cover (chain cover) 12 fixed to one end face (front end face) 8a, 9a, 10a of the cylinder block 8, the cylinder head 9 and the oil pan 10 is provided. The timing chain (not shown) is covered with a front cover 12. Although not shown, one end of the crankshaft protrudes from the front cover 12, and an accessory drive pulley is fixed to the protruding end.

  A transmission 13 for shifting the rotation of the crankshaft and transmitting it to the wheels is fixed to the other end surface (rear end surface) 2 a of the engine body 3. The engine body 3 and the transmission 13 constitute a power plant as an integral structure. The upper portion of the front cover 12 is supported by the right side frame 6 via the right engine mount 14, and the tip of the transmission 13 is supported by the left side frame 6 via the left engine mount 15. ing.

  The engine mounts 14 and 15 include an elastic body 16 such as rubber, and the engine body 3 and the transmission 13 are supported by the side frames 6 through the elastic body 16 so as not to be separated. The side frame 6 is wide on the front wheel 17, and the engine mounts 14 and 15 are attached to the side frame 6 at the upper part of the front wheel 17.

  In this embodiment, the front-rear and left-right directions are based on the state viewed from the driver. In the engine, generally, the crank axis direction is defined as the front-rear direction. Therefore, when the engine is placed horizontally, the front-rear direction of the vehicle body 1 intersects with the front-rear direction of the engine body 3. In the present embodiment, the direction of the vehicle body 1 is preferentially used for the direction.

  The engine of this embodiment is a front exhaust / rear intake system, and an intake manifold 18 is fixed to the rear surface of the cylinder head 9 and an exhaust manifold 19 is fixed to the front surface of the cylinder head 9. Reference numeral 20 denotes an exhaust turbocharger, reference numeral 21 denotes a catalyst case, and reference numeral 22 denotes an exhaust pipe.

  The transmission 13 has a base that overlaps the cylinder block 8 with a large diameter and a distal end opposite to the front cover 12 with a small diameter. A battery 24 is attached to the upper surface of the distal end of the transmission 13 via a bracket 24. 25 is fixed. Instead of using the bracket 24, a flat base portion may be formed in the housing of the transmission 13, and the battery 25 may be fixed to the base portion.

  As shown in FIG. 3, the battery 25 is filled with an electrolytic solution, and a separator 26, an electrode 27, and a partition plate 28 are disposed. However, when the battery 25 is fixed to the transmission 13, the battery 25 is fixed to the body frame 4. Therefore, in order to prevent the liquid surface from shaking, a drop lid type damping plate 29 is disposed in each partitioned space, and the damping plate 29 is pressed by the elastic body 30 from above. The elastic body 30 is made of a member having a large number of closed cells, such as a sponge, and is elastically compressed and deformed, but does not penetrate the electrolytic solution.

  Therefore, when the elastic body 30 is filled in the space above the damping plate 29, the electrolytic solution is restrained from shaking while holding the liquid surface in one drop. It is also possible to use a spring such as a coil spring as the elastic body 30. Needless to say, the elastic body 30 is pressed by a lid 31 from above. It is also possible to prevent the liquid surface from shaking by floating a thick sheet material in the electrolytic solution.

  Although there are various types of batteries 25, the weight for automobiles is generally about 10 to 20 kg. For this reason, when the battery 25 is fixed to the distal end portion of the transmission 13, the battery 25 functions as a balance weight and brings the center of gravity of the power plant including the engine body 3 and the transmission 13 close to the distal end side of the transmission 13. be able to.

  2 shows the center of gravity of the power plant when the battery 25 is not fixed. The center of gravity 32 is closer to the front cover 12 than the intermediate position 33 between the left and right engine mounts 14 and 15. It is close. For this reason, due to the vertical movement of the piston 34, couples act alternately on the power plant and try to rotate in a seesaw shape with the center of gravity 32 as a fulcrum.

  Further, since the crank arm and balance weight provided on the crankshaft are eccentric from the crankshaft center, the power plant tends to rotate around the crankshaft center by the rotation of the crankshaft. The rotational movement and the seesaw-shaped rotation combine to cause the power plant to perform a planetary movement around the center of the crankshaft, and the rotation radius is zero at the center of gravity 32 and the distance from the center of gravity 32 increases. growing.

  If no measures are taken, the distance L1 from the center of gravity 32 to the left engine mount 15 is considerably longer than the distance L2 from the center of gravity 32 to the right engine mount 14, so that the tip of the transmission 13 is above and below the center of gravity 32. Attempts to vibrate with an amplitude larger than the amplitude (amplifies and vibrates), and accordingly, the radius of the planetary motion becomes large at the tip of the transmission 13. That is, the transmission 13 tends to be swung around.

  As described above, the power plant tends to swing greatly at the position of the transmission, but since the vertical movement dimension of the power plant at the positions of the left and right engine mounts 14 and 15 is restricted, vibration energy is transmitted to the engine mount 14. , 15 is transmitted to the vehicle body frame 4 and propagates to the inside of the vehicle. As a result, the passenger feels uncomfortable or uncomfortable.

  On the other hand, when the battery 25 is fixed to the transmission 13 as in the present embodiment, the battery 25 has a considerable weight, so that the center of gravity 35 of the power plant is brought close to the intermediate position 33 between the left and right engine mounts 14 and 15. Therefore, the maximum amplitude of the vertical rotation of the power plant can be suppressed, and as a result, the maximum radius at which the power plant attempts to make a planetary motion around the crankshaft can be significantly suppressed. That is, it is possible to reduce the movement of the power plant to sway, and therefore the kinetic energy acting on the left and right engine mounts 14 and 15 is very small. It can prevent discomfort and discomfort.

  In FIG. 2, the center of gravity 35 with the battery 25 fixed is displayed in the immediate vicinity of the intermediate position 33, but as the center of gravity 35 approaches the intermediate position 33, vibration energy acting on the vehicle body frame 4 becomes smaller. When the battery 25 is fixed to the bracket 24 with bolts, the left and right positions of the battery 25 can be adjusted by forming bolt insertion holes in the left and right longitudinal long holes.

  The present invention can actually be embodied in an automobile. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Engine room 2 Engine main body 3 Crank axis 4 Body frame 6 Side frame 8 Cylinder block which comprises engine main body 9 Cylinder head which comprises engine main body 10 Oil pan which comprises engine main body 12 Front cover which comprises engine main body 13 Transmission 14, 15 Engine mount 16 Elastic body 24 Bracket 25 Battery 29 Damping plate 30 Elastic body 33 Intermediate position between left and right engine mounts 34 Piston 35 Center of gravity of power plant

Claims (1)

A transmission is fixed to one end surface of the engine main body arranged in the engine room so as to protrude in the crank axis direction, and an end of the engine main body opposite to the transmission, The engine body and the tip on the opposite side are each supported by a body frame via an elastic body,
A battery is attached to the transmission.
Automobile.

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