JPH0494425A - Auxiliary machine fitting structure for engine - Google Patents

Abstract

PURPOSE:To reduce the vibration of a power plant and increase the damping quantity by fitting an auxiliary machine vertically swayably, and providing a damping means damping the vertical vibration of the auxiliary machine. CONSTITUTION:A fitting bracket 5 is fitted to an engine main body 2 near the center line in the longitudinal direction of an auxiliary machine 4, a support section 25 can be deflection-displaced, and the auxiliary machine 4 can be vertically vibrated. The support rigidity in the longitudinal direction is high, and the longitudinal vibration of the auxiliary machine 4 is prevented. The second and third drive belts 18, 19 vertically wound on the pulley of the auxiliary machine 4 function as a damping means 20 damping the vertical vibration. The auxiliary machine 4 is vertically oscillated and vibrated with dampness, its vibration is in the opposite phase to the vertical vibration of the engine main body 2, the vertical vibration of the engine main body 2 is reduced, i.e., the vibration of a power plant is reduced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an engine auxiliary equipment mounting structure in which the auxiliary equipment attached to the side of the engine body is used as a dynamic damper for power plant vibration. be.

(Prior Art) Power plant vibration occurs in a power plant consisting of an engine, a transmission, etc. In order to prevent such power plant vibration from resonating in the practical rotation range, a structure is adopted that increases the rigidity of the joint, but in systems such as those in which the differential of a four-wheel drive vehicle is connected to the transmission, weight distribution As a result, the resonant frequency shifts to a relatively low rotation range of the practical rotation range, causing large vibrations and causing various problems such as an increase in noise inside the car. Various measures have been taken, such as increasing the rigidity of the engine and improving the power plant mount.

Further, engine auxiliary machines such as an air conditioner compressor are attached to the side of the engine, and these auxiliary machines also vibrate with the vibrations of the engine. In order to attenuate the resonance of the auxiliary machine due to power plant vibration, Japanese Utility Model Application Publication No. 82-190831 discloses a technique in which the auxiliary machine is provided with a dynamic damper that damps the resonance.

(Problems to be Solved by the Invention) The method of reducing power plant vibration by improving the rigidity of the power plant or improving the power plant mount portion as described above has various problems. In other words, the former method has the problem that increasing the rigidity of the power plant increases weight and cost, while the latter method has the problem that setting the characteristics of the mount part to reduce vibration is not necessarily easy. ing.

On the other hand, dynamic dampers are used as a technology to suppress various vibrations, but as mentioned above, various auxiliary machines are attached to the engine, and these auxiliary machines have a certain amount of weight, so it is difficult to install the auxiliary machines. If the auxiliary equipment itself can be used as a dynamic damper against engine vibration, power plant vibration can be easily reduced without increasing weight, number of assembly steps, cost, etc.

In view of the above circumstances, the present invention aims to reduce power plant vibration by using engine auxiliary equipment as a dynamic damper, and provides an engine auxiliary equipment mounting structure that further increases the amount of damping. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the engine auxiliary equipment mounting structure of the present invention utilizes the auxiliary equipment attached to the side of the engine body as a dynamic damper of power plant vibration. is attached to the engine body so that the engine can easily swing in the vertical direction, and is provided with damping means for damping the vertical vibration of the auxiliary equipment.

The damping means includes, for example, a drive belt wrapped around the auxiliary machine from above and below. Further, the mounting bracket for attaching the auxiliary equipment to the engine body is constructed of elastic bodies interposed between the upper and lower parts of the mounting bracket and the engine body.

Furthermore, it is constructed of a vibration damping member in which an elastic body is laminated between metal plates.

(Function) The main type of power plant vibration is vibration in the vertical vibration mode. Additionally, auxiliary equipment attached to the engine usually vibrates in various vibration modes, such as up and down, left and right, and front and back.

Therefore, if the auxiliary machine is made to vibrate only up and down in the same direction as the engine, the auxiliary machine will vibrate up and down in the opposite phase to the engine, and function as a dynamic damper.

However, in the above-mentioned auxiliary equipment mounting structure, when the auxiliary equipment is attached to the engine, the auxiliary equipment is supported so that it can easily swing in the vertical direction of the engine, and the vibration of the auxiliary equipment is suppressed by the vibration of the power plant. It is made to function as a dynamic damper by vibrating only up and down in the same direction and with opposite phases in line with the resonance point of the damper. Furthermore, damping means such as a drive belt, an elastic body, and a damping member are provided.
By attenuating the vertical vibration of the auxiliary equipment, the damping effect of the auxiliary equipment as a dynamic damper is enhanced.

Therefore, according to the above-mentioned mounting structure, the vibration direction of the auxiliary equipment is made to match the vertical vibration of the engine, and the auxiliary equipment vibrates up and down in an opposite phase with the vertical vibration of the engine. It functions as a damper, damping the vibrations of the power plant and reducing indoor noise.

(Example) Hereinafter, each embodiment of the present invention will be described in detail along with the drawings.

Example 1 Fig. 1 shows a front view of the main parts of an engine equipped with the auxiliary equipment mounting structure of this example, and Fig. 2 shows a side view of the main parts. be. Note that the left side of FIG. 2 is the front of the engine.

Engine auxiliary equipment 4 that functions as a dynamic damper is attached to the front part of the side of the engine body 2 via a mounting bracket 5.
is installed. As this auxiliary machine 4, a heavy air conditioner compressor is suitable.

The engine body 2 is an example of a V-type engine, and the cylinder head 8 is inclined on both sides of the upper part of the cylinder block 7.
．． 8 are fastened to each other, and a crankshaft 9 (engine output shaft) is disposed at the lower center of the cylinder block 7. Further, a lower block 10 is fastened to the lower part of the cylinder block 7. And the auxiliary machine 4
The mounting bracket 5 is fixed to the side surface of the lower block 10.

Further, above the auxiliary machine 4 (air conditioner compressor), an alternator for power generation as another engine auxiliary machine 11 is attached to the side of the cylinder block 7 of the engine body 2 by upper and lower brackets 12. Furthermore, below the auxiliary equipment 4 (air conditioner compressor),
An oil pump for power steering as another engine accessory 13 is attached by a bracket 14 to the side of a cast oil pan 15 fastened to the lower surface of the lower block 10 of the engine body 2.

The first drive belt 17 is applied from the crank pulley 9a at the end of the crankshaft 9 to the pulley 4a of the compressor 4 to transmit driving force, and from the boot 94b of the compressor 4 to the pulley 4a of the alternator 11 above. A second drive belt 18 is applied to the pulley 11a of the compressor 4, and a third drive belt 19 is applied from the pulley 4C of the compressor 4 to the pulley 13a of the lower oil pump 13, thereby indirectly transmitting driving force. be done.

Further, the second and third drive belts 18 and 19, which are wound around the auxiliary machine 4 from above and below, function as damping means 20 for damping vertical vibrations of the auxiliary machine 4.

The structure of the mounting bracket 5 for the auxiliary equipment 4 is as shown in FIG.
2 is formed, and a fixing bolt 23 (FIG. 2) is applied to the bolt hole 21 of this boss portion 22 to fix the mounting bracket 5 to the side surface of the lower block 10.

Further, four support parts 25 are provided, each having a screw hole 24 for attaching an auxiliary device, above and below the front and back of the position shifted forward from the four boss parts 22. The support part 2
5 is formed at a position protruding laterally from the boss portion 22, and the upper front and back support portions 25 and the lower front and back support portions 25 are connected by lateral ribs 26, respectively. Furthermore, the front upper and lower support parts 25 are connected by a vertical rib 27 at the front end, and this vertical rib 27 is formed to have a smaller width and cross-sectional area than the horizontal rib 26 and to have low rigidity. Note that openings 28 are formed in the front and rear bottom portions to reduce weight and rigidity.

The boss part 22 of the mounting bracket 5 as described above was fixed to the cylinder block 7, the upper and lower parts of the auxiliary machine 4 were fixed to the support part 25 with fastening bolts 29, and the auxiliary machine 4 was attached to the engine using the mounting brackets. In this case, the support rigidity of the auxiliary machine 4 is formed to be low in the engine vertical direction and high rigidity in the engine longitudinal direction, so that the auxiliary machine 4 is attached to be easily swingable in the engine vertical direction, and the auxiliary machine 4 has a small Vertical vibrations are allowed, longitudinal vibrations are restricted, and low-order vibrations occur only in the vertical direction.

In relation to the weight of the auxiliary equipment 4, the mounting bracket 5 is
The shape and dimensions of the power plant, that is, the rigidity of each part, are adjusted so that the minute vertical vibrations occur in synchronization with the resonant frequency of the power plant vibrations, and also in the opposite phase to the power plant vibrations. In addition to fixing the mounting bracket 5 to the engine body 2 at four locations as described above, it may also be fixed at two locations at the front and rear.

According to the auxiliary equipment mounting structure of this example configured as described above, the mounting bracket 5 is attached to the engine body 2 near the longitudinal center line of the auxiliary equipment 4, and the upper and lower ends of the mounting bracket 5, i.e. The support portion 25 can be deflected in a direction perpendicular to the plane of the paper in FIG. 3, and therefore, the auxiliary machine 4 can be vertically vibrated by the deflection of the mounting bracket 5. Further, the mounting bracket 5 has high support rigidity in the front-back direction, and by suppressing the back-and-forth vibration mode of the auxiliary machine 4, the back-and-forth vibration of the auxiliary machine 4 is prevented.

Furthermore, when the auxiliary machine 4 vibrates in the vertical direction, the second and third drive belts 18 and 19, which are wound around the pulleys 4b and 4c of the auxiliary machine 4 from above and below, provide damping that dampens the vertical vibration. It functions as means 20. That is, the drive belts 18 and 19 are made of rubber, a tensile strength member, etc., and the tension of the drive belts 18 and 19 increases and decreases as the distance between the bobbins increases and decreases in response to the vertical vibration of the auxiliary machine 4. It acts to damp the vertical vibration of the auxiliary machine 4.

Therefore, the auxiliary machine 4 vibrates vertically with damping by the damping means 20 in accordance with the vertical vibration of the engine main body 2, and the vibration has an opposite phase to the vertical vibration of the engine main body 2, and as a result, the compensation The machine 4 functions as a dynamic damper against vertical vibrations of the engine body 2, and reduces the vertical vibrations of the engine body 2 and, by extension, the vibrations of the power plant. In addition, auxiliary equipment such as compressors 4
Since it has a large mass and is mounted at a certain distance from the side of the engine body 2, the mass effect and vibration amplitude are large, and it is extremely effective as a dynamic damper.

In the above embodiment, the drive belts 18 and 19 are hung from both the upper and lower sides, but it is also possible to install the drive belts from only one of the upper or lower sides. The vibration damping effect can be obtained only for the single amplitude of the vertical vibration.

Embodiment 2 This embodiment is shown in FIG. 4 and is an example in which an elastic body is interposed as a damping means.

The engine body 2 is a V-type engine similar to the previous example,
An engine auxiliary machine 4 (air conditioner compressor) functioning as a dynamic damper is attached to the front part of the side surface via a mounting bracket 31. Further, above the auxiliary equipment 4, an alternator 11 is mounted on the upper and lower brackets 1.
It is attached by 2.

As shown in FIG. 5, the auxiliary equipment mounting bracket 31 of this example has a boss portion 22 in which bolt holes 21 are opened at two locations, front and rear, at the rear portion on the center line extending front and rear. A fixing bolt 23 is applied to the bolt hole 21 of the mounting bracket 31 to fix the mounting bracket 31 to the side surface of the lower block 10.

In addition, support parts 25 each having screw holes 24 for attaching auxiliary equipment are provided at the front and rear of the upper and lower sides of the position shifted forward from the two boss parts 22, and the auxiliary equipment 4 is mounted as in the previous example. Ru. Due to the structure of the mounting bracket 31, the support rigidity of the auxiliary equipment 4 is low in the engine vertical direction and high rigidity in the engine longitudinal direction, as in the previous example, and the mounting to the engine body 2 is on the center line. Since there are two locations, the auxiliary equipment 4 is mounted so that it can easily swing in the vertical direction of the engine.

On the other hand, on the rear side of the upper and lower parts of the mounting bracket 31 as described above, there is an elastic body 33 33 between the engine body 2 (lower block 10 and oil pan 15) as a damping means 32 for damping vertical vibrations. It is mediated. The elastic body 33 is made of rubber, plastic, or the like, and deforms in the compression direction as the auxiliary machine 4 vibrates up and down, thereby damping the vibration.

In relation to the weight of the auxiliary equipment 4, the mounting bracket 3
In this example, the shape and dimensions of 1, that is, the rigidity of each part, are adjusted so that the minute vertical vibration is generated in synchronization with the resonance frequency of the power plant vibration, and also in the opposite phase to the power plant vibration. Because it is fixed in several places, it has a mounting structure that allows it to vibrate more easily in the vertical direction than the previous model.

According to the auxiliary equipment mounting structure of this example configured as described above, the mounting bracket 31 is attached to the engine body 2 near the longitudinal center line of the auxiliary equipment 4, and the upper and lower ends of the mounting bracket 31 are That is, the support portion 25 is movable, and therefore, the auxiliary machine 4 can be vibrated up and down by the displacement of the mounting bracket 31.

Furthermore, when the auxiliary equipment 4 vibrates vertically, the elastic bodies 33 disposed above and below the mounting bracket 31 and between the engine body 2 function as a damping means 32 that damps the vibration in the vertical direction. It enhances the damping effect of the power plant vibration as a damper.

Embodiment 3 This embodiment is shown in FIG. 6, and is an example in which auxiliary equipment is attached to the engine body in the same manner as in Embodiment 1, and a damping member is provided as a damping means.

An engine auxiliary machine 4 (air conditioner compressor) functioning as a dynamic damper is attached to the front part of the side surface of the engine body 2 via a mounting bracket 5 similar to that of the first embodiment, so that it can easily swing in the vertical direction. Further, an alternator 11 is attached above the auxiliary machine 4 using upper and lower brackets 12.

On the other hand, the lower end of the mounting bracket 5 and the auxiliary equipment 4 as described above are connected to each other.
A vibration damping member 36 serving as a damping means 35 for damping vertical vibration is provided in connection with the vibration damping member 36 . The second vibration damping member 36 is constructed by laminating an elastic material 38 such as rubber or plastic between two metal plates 37 and 37 (steel plates), as shown in the cross-sectional structure in FIG. One end of the vibration damping member 36 is fixed to the lower surface of the mounting bracket 5, and the other end is fixed to the lower end of the auxiliary machine 4 with screws 39, respectively. The end side vibrates and acts to dampen vibrations in the vertical direction.

Note that the fixed side of the vibration damping member 36 may be directly attached to the engine body 2.

According to the auxiliary equipment mounting structure of this example configured as described above, the auxiliary equipment 4 is mounted in a state in which it easily vibrates in the vertical direction by the mounting bracket 5, and the phase thereof occurs in the opposite phase to the engine vibration, so that it acts as a dynamic damper. Furthermore, in the vertical vibration of the auxiliary machine 4, the damping means 35 by the damping member 36 damps the vertical vibration, thereby enhancing the function of the dynamic damper.

In addition to the air conditioner compressor, an alternator, oil pump, etc. may be used as the engine auxiliary equipment 4 to function as a dynamic damper.In this case, as the weight of the auxiliary equipment 4 changes, the vibration characteristics also change, so the power In order to synchronize with plant vibrations, design changes such as distribution of support rigidity of auxiliary equipment mounting parts are required.

(Effects of the Invention) According to the present invention as described above, the auxiliary equipment is attached to the side of the engine body so that the engine can easily swing in the vertical direction, and
By providing a damping means to attenuate the vertical vibration of the auxiliary equipment, the direction of the vibration of the auxiliary equipment can be made to match the vertical vibration of the engine by giving directionality to the support rigidity of the auxiliary equipment mounting part. The machine functions as a dynamic damper that vibrates vertically in an opposite phase with the vertical vibration of the engine, and the damping means can enhance the damping effect of the auxiliary machine as a dynamic damper, suppressing vibrations at the resonance point of the power plant. It can effectively attenuate and reduce indoor noise.

[Brief explanation of drawings]

FIG. 1 is a front view of the main parts of an engine equipped with an auxiliary equipment mounting structure according to the first embodiment of the present invention, FIG. 2 is a side view of the main parts, FIG. 3 is a front view of the mounting bracket, and FIG. The figure is a front view of main parts of an engine equipped with an auxiliary equipment mounting structure according to a second embodiment of the present invention, and FIG. 5 is a front view of its mounting bracket.
FIG. 6 is a front view of essential parts of an engine equipped with an auxiliary equipment mounting structure according to a third embodiment of the present invention, and FIG. 7 is an enlarged sectional view of a vibration damping member thereof. 2...Engine body, 5,31...Mounting bracket, 4...Auxiliary equipment (air conditioner compressor), 18.19...Drive belt... 20
．． 32.35...damping means, 33...
...Elastic body, 36...Vibration damping member. No.! Figure Figure Figure Figure

Claims (4)

[Claims] (1) An engine auxiliary equipment mounting structure in which the auxiliary equipment attached to the side of the engine body is used as a dynamic damper for power plant vibration, the auxiliary equipment is installed to easily swing in the vertical direction of the engine, and the auxiliary equipment is An auxiliary equipment mounting structure for an engine, characterized in that it is provided with a damping means for damping directional vibration. (2) The engine auxiliary equipment mounting structure according to claim 1, wherein the damping means is a drive belt that is wound around the auxiliary equipment from above and below. (3) The engine auxiliary equipment mounting according to claim 1, wherein the damping means is an elastic body interposed between the upper and lower parts of the mounting bracket for attaching the auxiliary equipment to the engine main body, and between the engine main body and the upper and lower parts of the mounting bracket. structure. (4) The engine accessory mounting structure according to claim 1, wherein the damping means is a vibration damping member in which an elastic body is laminated between metal plates.