JPH019692Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vibration damper for damping the vibrations of a vehicle internal combustion engine, and particularly to a vibration damper for a vehicle internal combustion engine that can effectively recover the vibration energy of the internal combustion engine. Regarding.

[Conventional technology and its problems]

Conventionally, engine mounts and engine dampers have been adopted as vibration countermeasures for internal combustion engines (hereinafter also referred to as engines) for automobiles. The engine mount is used to attach and support the engine to the vehicle body via a cushioning material such as rubber. On the other hand, the engine damper is made up of a dart pot and the like and absorbs engine vibrations, and both of these are used to prevent vehicle body vibrations caused by engine vibrations.

Among these, engine mounts are designed to have a low natural frequency (resonance frequency) of the mount system, and reduce vibration transmission from the engine to the vehicle body in the frequency range above the natural frequency. Attenuates engine vibration itself,
It converts and absorbs engine vibrations into thermal energy. However, both the engine mount and the engine damper only dissipate engine vibration energy to the outside as thermal energy or acoustic energy, and the energy is wasted without any effective recovery.

On the other hand, auxiliary equipment such as power steering attached to an internal combustion engine requires the greatest drive output when the engine is idling. However, since the oil pump, which is the drive unit of the auxiliary equipment, is belt-transmitted to the engine, the drive output is proportional to the number of rotations of the engine. For this reason, in the past, only a small output could be obtained when the engine was idling at low speed. In order to achieve the desired drive, the engine should be able to provide large driving force even at low speeds.
One possibility is to use a larger oil pump, but this poses the problem of large losses at medium and high speeds and the need for a large space.

In view of the above circumstances, the present invention was devised in order to provide a vibration damper that can recover the vibration energy of an internal combustion engine and utilize the energy effectively.

[Means to solve the problem]

In this invention, a vibrating actuator is installed at the tip of the engine foot extending from both sides of the engine to transmit the vibration, and a compression chamber is provided in which the fluid that is compressed and expanded by the excitation force of this actuator is hermetically contained. At the same time, this compression chamber is provided with a fluid passageway connected to a drive section of an auxiliary machine attached to the engine.

[Effect]

With the above configuration, when the engine undergoes rolling vibration, the vibration actuator damps the vibration and compresses and expands the fluid in the fluid compression chamber.
This fluid is led to the drive part of the auxiliary machine through the fluid passage, and the drive part is actuated by its energy.

〔Example〕

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, 1 is an engine, and from the outer wall of the engine 1, two engine feet 3 are provided symmetrically extending horizontally in a direction orthogonal to the shaft 2 of the engine 1. .
The engine 1 is supported by the vehicle body by vibration dampers 5 of the present invention, which are respectively interposed between the tip of the engine foot 3 and the vehicle body side mount 4.

As shown in an enlarged view in FIG. 2, the vibration damper 5 consists of a piston 9, which is a vibration actuating body, which is suspended via a connecting rod 8 from a bracket 7 fixed to the bottom surface of the end of the engine foot 3 by a bolt 6, and a mount on the vehicle body side. The cylinder 11 is fixedly attached to the piston 4 by bolts 10 and slidably guides the piston 9 while fitting into the piston 9.

The connecting rod 8 is pivotally supported on the bracket 7 via a pin 12, and the piston 9 is also pivotally supported on the connecting rod 8 via a pin 12. Stove rod 8
A seal 13 is interposed between the upper wall of the cylinder 11 and the upper wall of the cylinder 11 to make the inside of the cylinder 11 airtight. Inside the cylinder 11, the lower surface of the piston 9, the cylinder 11
Cylinder head 1 on the side and under the cylinder 11
A compression chamber 14 is formed by the upper surface of 1a, and oil is sucked into the compression chamber 14 by the vertical movement of the piston 9.
This is compressed and discharged.

The compression chamber 14 has an oil tank 1 shown in FIG.
An oil inlet passage 16 for introducing oil from 5 is connected thereto, and an oil discharge passage 18 serving as a fluid passage for pressurizing compressed oil to an accumulator 17 provided in an auxiliary device 24 such as a power steering is connected thereto. ing. Cylinder head 11a
a suction valve 19 for opening and closing the oil introduction passage 16;
A discharge valve 20 for opening and closing the oil discharge passage 18 is provided. In addition, the auxiliary machine 24 has a supply path 25 that supplies the oil accumulated in the accumulator 17 and an oil tank 1 that supplies the oil used in the auxiliary machine 24.
5 are connected to each other.

In addition, a spring 21 is installed between the upper wall of the cylinder 11 and the lower surface of the engine foot 3 to prevent a collision between the cylinder 11 and the engine foot 3 due to relative movement between the engine foot 3 and the vehicle body side mount 4.
In addition, an interference prevention rubber 22 is provided on the upper wall of the cylinder 11. Also, a return path 23 is provided for returning leaked oil supplied to the compression chamber 14 and leaked to the upper part of the piston 9 from between the piston 9 and the cylinder 11 to the oil tank 15.
is interposed between the upper part of the cylinder 11 and the oil tank 15.

Next, the operation of this embodiment will be described.

The engine 1 (particularly a diesel engine) causes rolling vibrations due to torque fluctuations. This rolling vibration is greatest when idling.
The engine 1 vibrates as shown in FIG. 1, and the engine foot 3 moves up and down due to this rolling vibration.
Further, this vertical movement of the engine foot 3 is transmitted to the piston 9 via the bracket 7 and connecting rod 12, and the piston 9 reciprocates within the cylinder 11. As the piston 9 rises, the compression chamber 14 expands and becomes a negative pressure, opening the suction valve 19 and sucking oil into the compression chamber 14 from the oil introduction path 16. Then, as the piston 9 descends, the compression chamber 1
4 is compressed, the pressure of the oil in the compression chamber 14 is increased, and the oil in the compression chamber 14 is pressure-fed from the oil discharge passage 18 through the discharge valve 20 to the accumulator 17, where the pressure is accumulated. The oil stored in the accumulator 17 is supplied to the auxiliary equipment 24 as a driving source as needed.

In this way, since the vibration damper 5 driven by the vibrations of the engine 1 is provided between the engine 1 and the vehicle body side mount 4, the vibration energy of the engine 1 is converted into pumping work of the piston 9 of the vibration damper 5. absorbed, engine 1 vibrations are damped. Moreover, since the vibration of the engine 1 is used as power, hydraulic pressure can be extracted without consuming the output of the engine 1, which was previously wasted.
vibration energy can be effectively recovered. During idling, when the drive source of the auxiliary machine 24 is most needed, the rolling vibration of the engine 1 is greatest, so the maximum hydraulic power can be extracted from the vibration damper 5. That is, driving force can be supplied with a simple configuration without requiring a large pump or the like.

Furthermore, since the vibration damper 5 of this embodiment has the function of a conventional engine mount, the engine mount can be omitted. In addition, engine 1
In order to reduce the vibration transmission rate of the high frequency vibrations to the vehicle body side mount 4, a vibration isolating rubber with low hardness may be interposed between the vehicle body side mount 4 and the cylinder head 11a.

Next, a second embodiment of the present invention will be described.

The vibration damper 5a of this embodiment is, for example, a fourth vibration damper.
As shown in the figure, it is attached to the upper side wall of the engine 1, which is subject to large left-right displacement due to rolling vibration of the engine 1. The engine 1 is supported on the vehicle body side mount 4 by an engine mount 27 interposed between the vehicle body side mount 4 and the engine foot 3.

When the vibration damper 5a of this embodiment is shown enlarged in FIG. 5, the cylinder head 11a and cylinder 11 of the vibration damper 5a are fixed to the side wall of the engine 1, and the axis of the cylinder 11 is horizontally aligned along the vibration direction of the engine 1. It is formed. A piston 9 that fits into the cylinder 11 and is slidable therein is provided within the cylinder 11 . A connecting rod 8 is connected to the piston 9. The connecting rod 8 extends horizontally through the bottom wall of the cylinder 11, and a mass body 28 is attached to the tip of the connecting rod 8.

Springs 29, 29 are provided between the bottom wall of the cylinder 11 and the piston 9, and between the bottom wall of the cylinder 11 and the connecting rod 8 on the mass body 28 side, respectively. Piston 9, connecting rod 8 and mass body 2
8 are integrally vibrated by the springs 29, 29. In FIG. 5, 14 is a compression chamber, 19 is an intake valve, 20 is a discharge valve, 16 is an oil introduction passage, 18 is an oil discharge passage, 23 is a return passage, and 13 is a seal.

Due to the rolling vibration of the engine 1, the cylinder head 11a and the cylinder 11 vibrate from side to side, and a mass point consisting of the piston 9, connecting rod 8, and mass body 28 connected to the cylinder 11 via springs 29, 29 is applied. The oscillated piston 9 reciprocates within the cylinder 11. In the illustrated example, oil is sucked into the compression chamber 14 by the rightward movement of the piston 9, is compressed by the leftward movement of the piston 9, and is discharged into the oil discharge path 18. The oil discharged into the oil discharge path 18 is either directly supplied to the auxiliary equipment driving pump, or is temporarily stored in an accumulator and supplied to the auxiliary equipment when necessary.

In this way, the vibration of the engine 1 is converted into pump power and absorbed by the vibration damper 5a, which has the function of an oil pump, and similarly to the above embodiment, the vibration of the engine 1 is reduced and the engine vibration energy is effectively recovered.

In addition, the mass of the mass body 28 and the spring 29
If a spring constant of 29 is selected, the piston 9 resonates during idling, and the large rolling vibration of the engine 1 during idling can be effectively extracted as pump power.

In the vibration damper 5 of the first embodiment shown in FIG.
A is attached to the vehicle body side mount 4, but conversely, the piston 9 is attached to the vehicle body side mount 4 side, the cylinder 11 and the cylinder head 11a are attached to the engine foot 3 side, and the cylinder 11 is attached to the engine foot 3 side.
Also, the cylinder head 11a may be configured as a vibrating body.

Further, the vibration damper may be mounted on the engine 1 at any location where vibration amplitude such as rolling vibration of the engine 1 is large. The engine 1 has a main shaft of inertia 30 as shown in FIG.
Since the portion A indicated by hatching is a portion where the horizontal displacement due to rolling vibration is large, the vibration damper 5a of the second embodiment may be attached to the portion A.

Further, the structure of the vibration damper is not limited to the vibration dampers 5 and 5a of the above embodiments, but for example, it may have a structure similar to a hydraulic jack, and the lever of the hydraulic jack may be a vibration actuating body that transmits engine vibrations, or a bellows structure. A sealed fluid compression chamber is formed, and this fluid compression chamber is expanded and expanded by engine vibration.
The structure can be freely compressed and driven.

Further, the auxiliary equipment 24 may be of any type, such as not only power steering but also automatic door lock, brake servo, etc.

[Effect of idea]

In summary, according to the present invention, the following excellent effects can be obtained.

A vibration actuator is installed at the tip of the engine foot of the engine, forming a compression chamber that seals the fluid to be compressed and expanded, and a fluid passage connected to the drive part of the auxiliary equipment is installed, so that the rolling of the engine is prevented. By attenuating vibrations and recovering their energy, effective driving force can be supplied to auxiliary equipment with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a vibration damper according to an embodiment of the present invention attached to an engine, Fig. 2 is an enlarged sectional view of the vibration damper, and Fig. 3 is a system diagram of the hydraulic system including the vibration damper. , Fig. 4 is a front view showing the vibration damper according to the second embodiment of the present invention attached to the engine, Fig. 5 is an enlarged sectional view of the vibration damper, and Fig. 6 shows the horizontal displacement caused by rolling vibration of the engine. It is a side view for explaining a large part. In the figure, 1 is an engine, 3 is an engine foot, 5, 5a are vibration dampers, 9 is a piston, which is a vibrating body, 14 is a compression chamber, and 24 is an auxiliary machine.

Claims (1)

[Scope of utility model registration request] A vibrating actuator that transmits the vibration is provided at the tip of the engine foot extending from both sides of the engine, and a compression chamber is formed that seals and stores fluid compressed and expanded by the excitation force of the actuator. A vibration damper for an internal combustion engine for a vehicle, characterized in that the compression chamber is provided with a fluid passage connected to a drive unit of an auxiliary machine attached to the engine.