JP4147783B2 - Mounting device - Google Patents

Description

[0001]
The present invention relates to a mount device that reduces vibrations from a vibrating body such as an automobile engine.
[0002]
[Prior art]
In general, an engine mount device for an automobile prevents torque generated by rotating the engine while preventing transmission of engine vibration generated in a wide engine speed range from idling to full power running of the engine. And has a function of reducing vibration transmitted from the road surface to the engine. For this reason, conventionally, in order to reduce vibration transmitted from the engine to the vehicle body, the engine is attached to the vehicle body via an engine mount device having a vibration isolation function.
[0003]
As such an engine mount device, there is one described in Japanese Utility Model Laid-Open No. 6-14584, which is shown in FIG. In this engine mount apparatus, an engine side holding body 58 is fixed to a stay 51 fixed to an engine 53, and a frame side holding body 59 is fixed to stays 52 fixed to side frames 57 arranged on both sides of the vehicle. Rubber 55 is fixed between the holding bodies 58 and 59. Such an engine mount device is called a rubber mount or a passive mount type mount device because it reduces vibrations only by the elasticity of rubber 55 and internal friction, and is widely used because it has a small and simple structure. .
[0004]
Further, an engine mount device that is called an active mount method as described in JP-A-7-12172 and includes a control device that actively reduces vibration has been proposed. The engine mount device M will be described with reference to FIG.
[0005]
Cup The engine mount device M includes an annular mounting member 1 having a bolt hole 1 ₁ for attachment to the vehicle body, and a rubber block 2 which is fixed on the mounting member 1, which is fixed on the rubber block 2 The sub-fluid chamber housing 3 has a shape. The opening of the auxiliary fluid chamber housing 3, the rubber diaphragm 4, a plate-shaped mounting member 5 provided upright engine mounting bolts 5 ₂ is fixed by co-fastening bolt 6. Between the bottom and the diaphragm 4 of the auxiliary fluid chamber housing 3 is a sub-fluid chamber 7 communicates with the atmosphere by hole 5 ₁ space opened in the mounting member 5 between the diaphragm 4 and the mounting member 5.
[0006]
An annular movable plate support member 8 and a housing 9 are fixed to the lower surface of the mounting member 1 by fastening bolts 10 together. A flat annular rubber spring 11 is fixed to the inner periphery of the movable plate support member 8, and the movable plate 12 is fixed to the inner periphery of the rubber spring 11. Thus, the main fluid chamber 13 is defined by the sub fluid chamber housing 3, the rubber block 2, the rubber spring 11, and the movable plate 12. Furthermore, inside the provided annular grooves 9 ₁ of the housing 9, this annular groove 9 in _1, together with the magnet 15 is fixed, the coil 18 wound on a bobbin 17 fixed to the movable plate 12 is also arranged Has been.
[0007]
A passage forming member 24 is fixed inside the sub fluid chamber housing 3, and the switching valve 20 switches between the through hole 23 on the bottom surface of the sub fluid chamber housing 3 and the through hole 27 of the passage forming member 24. Possible long and short passages not shown are provided.
[0008]
The effect of the active mount type engine mount apparatus M will be described. When vibration from the engine is input to the engine mount device M, the vibration from the engine is transmitted to the rubber block 2 through the sub fluid chamber housing 3 and causes expansion and contraction of the main fluid chamber 13. Here, when the vibration from the engine has a high frequency equal to or higher than a predetermined value, the switching valve 20 connects the main fluid chamber 13 and the sub fluid chamber 7 through a short passage, and the vibration from the engine has a low frequency less than the predetermined value. In this case, the main fluid chamber 13 and the sub fluid chamber 7 are communicated with each other through a long passage by the switching valve 20. This passage allows fluid to flow back and forth between the main fluid chamber 13 and the sub-fluid chamber 7 to alleviate the pressure change in the main fluid chamber 13, and at this time, the vibration is attenuated by the resistance of the fluid passing through the passage. At this time, when the fluid in the passage resonates, energy is effectively absorbed, so that vibration can be significantly reduced. In addition, since the resonance frequency can be made lower than that of the passive mount, the vibration transmissibility can be lowered in a frequency range slightly higher than the resonance frequency, and vibration can be reduced. In this engine mount apparatus M, vibrations can be reduced over a wide frequency range because the long and short paths having two resonance frequencies can be switched.
[0009]
Further, in the engine mount device M, a vibration force from the engine is detected by a sensor (not shown), and a current having the same frequency as that of the vibration force is applied to the coil 18. Then, due to the electromagnetic force acting between the magnet 15 and the coil 18, the diaphragm 12 also vibrates at the same frequency and the same phase as the excitation force, so that the pressure fluctuation in the main fluid chamber 13 is reduced, and the engine main fluid chamber is reduced. The vibration transmitted to the vehicle body through the fluid in 13 can be further reduced. When the active mount type engine mount device is used in this way, vibration can be reduced more effectively than the passive mount type engine mount device.
[0010]
[Problems to be solved by the invention]
By the way, the rubber 55 of the rubber mount as shown in FIG. 4 has a hardness determined so that the strain caused by the static load due to the engine weight is not so large, and a relatively hard rubber is used. Such a rubber mount is an anti-vibration region for vibrations of a relatively high level at a slightly higher frequency than the natural frequency of the system composed of the rubber 55 mounting device and the engine 53, but sufficiently reduces vibration. There was a problem that it was difficult to do.
[0011]
Furthermore, if the engine mount apparatus M shown in FIG. 5 is not in an upright arrangement, the fluid does not flow through the passage between the main fluid chamber 13 and the sub fluid chamber 7 and there is no vibration reduction effect. Must be used in an upright arrangement, which is not suitable for the inclined mount type as shown in FIG. 4 and has a complicated configuration. By the way, in recent years, the use of a piezo actuator utilizing the piezo effect has been studied. Although this piezo actuator has a simple structure and can be used in an inclined mount type, a plurality of piezo actuators are used when used as an engine mount device. Therefore, the size is several times as large as that of the rubber mount as shown in FIG. 4, which is not realistic.
[0012]
In view of the above problems, the present invention is an active mount method that can be easily reduced with a simple configuration and can sufficiently reduce vibration even at a relatively high level of a frequency slightly higher than the natural frequency. Although it is easy to manufacture with a mounting device or a simple configuration, it can sufficiently reduce vibration even at a relatively high level of vibration slightly higher than the natural frequency, and it can also be used for an inclined mount type. An active mount type mounting device that can be used is provided.
[0014]
[Means for Solving the Problems]
The mounting device according to the first aspect of the present invention can sufficiently reduce the vibration even at a relatively high level of vibration slightly higher than the natural frequency, and can also be used in an inclined mount type. In order to solve the problem to be solved, the bellows comprises: a case having an opening on one end surface; a bellows having one end joined to the one end surface; and a slide member slidably attached to one side surface of the case. The other end of the case is sealed and fixed to the slide member, the slide member is fixed to one inclined surface of the vibrating body or the vibration receiving body, and the other side surface of the case is the other side of the vibrating body or the vibration receiving body. A mounting device fixed to an inclined surface, wherein a fluid is sealed in the case and the bellows, and a plunger acting on the fluid is oscillated in the case. An actuator that moves in the same direction as the vibration force from the actuator is installed, the plunger is slidable in the opening with a gap between the opening, and the mounting device is placed symmetrically with the mounting device as a pair. It is used in the mount format.
[0015]
The invention according to claim 2 is characterized in that in the mounting device according to claim 1, an accumulator having a chamber communicating with the inside of the case is provided.
[0016]
According to a third aspect of the present invention, in the mount device according to the first or second aspect , the actuator is actuated by an electromagnetic coil.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0018]
FIG. 1 is a cross-sectional view of the engine mount device of the first embodiment, in which the engine mount device is arranged vertically.
[0019]
As shown in FIG. 1, the engine mount apparatus 100 includes a case 106 having a cylindrical container shape in which an opening 104 is provided in the upper surface plate 102, a bellows 108 having one end joined to the upper surface plate 102, And a plate 110 that closes the other end of the bellows 108. The plate 110 is fixed to the engine 122 via the rubber mount 120, and the bottom plate 112 is fixed to the vehicle body portion 124 such as a frame. The rubber mount 120 is similar to the conventional one shown in FIG. 4 and has two plates 126 fixed to both ends of the rubber 128, and therefore the description thereof is omitted.
[0020]
A plunger 140 is disposed in the opening 104 of the upper surface plate 102 of the case 106, and a bellows chamber 134 is formed surrounded by the upper surface plate 102, the bellows 108, the plate 110, and the plunger 140 of the case 106. The plunger chamber 144 is formed by being blocked by the plunger 140. The bellows chamber 134 and the plunger chamber 144 communicate with each other through a gap 146 formed between the opening 102 and the plunger 140, and both chambers 134 and 144 are filled with a fluid such as oil. The gap 146 statically balances the pressure inside the bellows chamber 134 and the plunger chamber 144 so that the weight of the engine 122 is not applied to the plunger.
[0021]
An accumulator 154 is provided on the side of the case 106. The accumulator 154 is divided into an oil chamber 158 and a gas chamber 160 by a diaphragm such as a diaphragm 156. The plunger chamber 144 and the oil chamber 158 communicate with each other through a passage 162, and these chambers 144 and 158 are also filled with a fluid such as oil. Since the weight of the engine 122 is transmitted to the diaphragm 156 via the oil in the bellows chamber 134, the gap 146, and the plunger chamber 144, the gas chamber 160 is filled with a gas having a pressure sufficient to support the weight of the engine 122. Yes.
[0022]
The plunger 140 is guided by the opening 104 of the upper surface plate 102 and can slide up and down. A position detection sensor 114 is disposed on the bottom plate 112 to detect the position of the plunger 140.
[0023]
Inside the case 106, the actuator is installed Before moving the plunger 140 which acts on oil in the bellows chamber 134 and the plunger chamber 144. This actuator includes a permanent magnet 174 fixed to the peripheral wall 170 of the case 106 and an electromagnetic coil 172 wound around the lower portion of the plunger 140. When the electromagnetic coil 172 is energized, the plunger 140 is also moved by the electromagnetic force acting between the electromagnetic coil 172 and the permanent magnet 174.
[0024]
Here, the effect of the engine mount apparatus 100 will be described. The vibration force from the engine 122 is transmitted to the plunger 140 via the fluid in the rubber mount 120 and the bellows chamber 134, and the position of the plunger 140 is changed. Therefore, the position detection sensor 114 detects the position change of the plunger 140. You can know more. When the excitation force from the engine 122 is known, a control device (not shown) generates an output current in phase with the same frequency as the excitation force, supplies it to the electromagnetic coil 172, and moves the plunger 140 in the same direction as the excitation force. Thus, the bellows 108 is expanded and contracted to prevent vibration from being transmitted from the engine 122 to the vehicle body portion 124.
[0025]
More specifically, for example, when the rubber mount 120 is compressed by a downward exciting force, the plunger 140 is also moved downward, the bellows 108 is contracted and the plate 110 is also moved downward, and the rubber mount 120 is moved downward. Is prevented from being compressed, and the vibration force from the engine 122 is prevented from being transmitted to the vehicle body portion 124. At this time, the volume of the bellows chamber 134 is not changed, but the plunger chamber 144 is contracted. Then, the oil in the plunger chamber 144 moves to the oil chamber 158 of the accumulator 154 through the passage 162, but the gas chamber 160 contracts and the oil chamber 158 expands due to the deformation of the diaphragm 156. There is no great resistance to moving to. Therefore, the plunger 140 can be easily moved downward by the electromagnetic coil 172, and the vibration force can be prevented from being transmitted from the engine 122 to the vehicle body portion 124.
[0026]
On the contrary, when the upward vibration force is applied, the plunger 140 is moved upward and the bellows 108 is extended to prevent the rubber mount 120 from being pulled. It is possible to prevent the vibration force from being transmitted to the vehicle body portion 124.
[0027]
In the engine mount device 100, the bellows 108 is long and soft, so that it can sufficiently expand and contract even with a relatively high level of vibration slightly higher than the natural frequency. Vibration can be reduced sufficiently. Moreover, in order to reduce vibration, it is only necessary to always generate an output current in the same phase at the same frequency as the excitation force from the engine 122 and supply it to the electromagnetic coil 172, as in the conventional example shown in FIG. A complicated and not easily manufactured structure in which two long and short passages are provided between the main fluid chamber 13 and the sub fluid chamber 7 and the long passage and the short passage are switched by the switching valve 20 in accordance with the frequency of the excitation force. do not need.
[0028]
FIG. 2 is a front view of the engine mount device according to the second embodiment, in which the engine mount device is disposed on a vehicle body such as an inclined frame. In the engine mount device 180 of this embodiment, the case 106 has a square cross section and is elongated in the axial direction, and the slide member 184 can be moved on one side of the case 106 via a slide mechanism 182 using balls, rollers, or the like. The plate 110 that closes the bellows 108 is fixed to one end of the slide member 184. However, the internal structure of the bellows 108 and the case 106 is the same as that of the embodiment shown in FIG. 1, and it is the same as that of the embodiment shown in FIG. Description is omitted.
[0029]
The other side surface of the case 106 is fixed to the inclined surface of the vehicle body portion 124 such as a frame inclined via the spacer 188, and the slide member 184 is fixed to the inclined surface of the engine 122 via the rubber mount 120. The pair of engine mount devices 180 are symmetrically arranged on both sides of the engine 122 and are used in an inclined mount format.
[0030]
Here, the function and effect of the engine mount device 180 will be described. The force transmitted from the engine 122 to the vehicle body portion 124 includes a weight of the engine 122 that is a static load and a vibration force generated from the engine 122. The weight of the engine 122 can be supported by the reaction force from the side surface of the case 106 when the engine mount device 180 of this embodiment is disposed symmetrically on both sides of the engine 122. On the other hand, the excitation force from the engine 122 is input to the engine mount device 180 by moving the slide member 184 and the plate 110 along the axial direction of the case 106. Then, the engine mount device 180 works similarly to the engine mount device 100 of the first embodiment, and prevents the vibration force from the engine 122 from being transmitted to the vehicle body portion 124.
[0031]
Further, since the engine mount device 180 is an active mount type, even a low frequency vibration and a slightly higher frequency vibration can be sufficiently reduced than the low frequency vibration and the natural frequency. Furthermore, since the engine mount device 180 of the present embodiment receives only the vibration force from the engine 122 without inputting the weight of the engine 122, the engine mount device 180 can be downsized.
[0032]
FIG. 3 is a front view of the engine mount device of the third embodiment. In contrast to the engine mount device 180 of the second embodiment described above, the engine mount device 190 of the present embodiment is fixed to a vehicle body portion 124 such as a frame in which the slide member 184 is inclined via the rubber mount 120, and the case 106 The other side surface is fixed to the engine 122 via the spacer 188. Other than this, the second embodiment is the same as the second embodiment. Therefore, this embodiment also has the same effect as the second embodiment.
[0033]
By the way, the present invention is not limited to the engine mount device that fixes the engine 122 to the vehicle body portion 124 as in the above embodiments, but the vibrating body that generates vibration is fixed to the vibration receiving body that supports the vibrating body. It can be applied to all mounting devices. Further, in the first embodiment, the bottom plate 112 may be fixed to the engine 122 and the rubber mount 120 may be fixed to the vehicle body portion 124, contrary to the example shown in FIG. Furthermore, in the first embodiment, the rubber mount 120 can be omitted.
[0034]
【The invention's effect】
As is apparent from the above description, according to the mounting device of the first aspect of the invention, the bellows is expanded and contracted by moving the plunger in the same direction as the excitation force in accordance with the excitation force from the vibrating body. Thus, it is possible to prevent vibration from being transmitted from the vibrating body to the vibration receiving body. At this time, the soft bellows can sufficiently expand and contract sufficiently even with a relatively high level of vibration at a slightly higher frequency than the natural frequency, so that such vibration can be sufficiently reduced. In addition, the mounting device of the present invention employs a simple control method in which the plunger is always moved in phase with the same frequency as the excitation force from the vibrating body over the entire frequency range in order to reduce vibration. The structure is easy to manufacture.
[0035]
In particular, mounting apparatus of the present invention, by arranging symmetrically in pairs inclined to the mount type mounting apparatus, it is possible to support the weight of the vibrator by the casing, mounted also supports the heavy vibrator The weight of the vibrating body is not input to the device. Then, the mount device of the present invention, the slide member is slidable, the mounting device since only vibratory force from the vibration member is entered, Ru can be miniaturized mounting device.
[0036]
According to the second aspect of the invention, since the accumulator having the chamber communicating with the inside of the case is further provided, the fluid in the case can enter and exit the accumulator chamber as the plunger moves. When the plunger is moved according to the vibration force from the body, it is possible to prevent the vibration from the vibration body from being transmitted to the vibration receiver more effectively without a large resistance.
[0037]
According to the third aspect of the present invention, since the actuator is operated by an electromagnetic coil, fine control is easy by using a microcomputer, and the structure is simple and the manufacture is easy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an engine mount device according to a first embodiment of the present invention.
FIG. 2 is a front view of an engine mount device according to a second embodiment of the present invention.
FIG. 3 is a front view of an engine mount device according to a third embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a conventional passive mount type rubber mount.
FIG. 5 is a cross-sectional view of a conventional active mount type engine mount device.
[Explanation of symbols]
100, 180, 190 Engine mount device (mount device)
104 Opening 106 Case 108 Bellows 120 Rubber mount 122 Engine (vibrating body)
124 Body part (vibration receiver)
140 plunger
146 Clearance 154 Accumulator 158 Oil chamber (chamber)
172 Electromagnetic coil (actuator)
174 Permanent magnet (actuator)
184 Slide member

Claims (3)

A case having an opening on one end surface; a bellows having one end joined to the one end surface; and a slide member slidably attached to one side of the case, the other end of the bellows being sealed. In addition, the mount is fixed to the slide member, the slide member is fixed to one inclined surface of the vibrating body or the vibration receiving body, and the other side surface of the case is fixed to the other inclined surface of the vibrating body or the vibration receiving body. A device,
A fluid is sealed in the case and the bellows, and an actuator is installed in the case to move a plunger acting on the fluid in the same direction as the vibration force from the vibrating body. A gap is provided between the opening and slidable in the opening.
A mounting device characterized in that the mounting devices are arranged symmetrically in pairs and are used in an inclined mounting format. The mounting apparatus according to claim 1, further comprising an accumulator having a chamber communicating with the inside of the case. The mounting apparatus according to claim 1, wherein the actuator is operated by an electromagnetic coil.

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