JPH0630544U - Active mount - Google Patents

Abstract

(57) [Summary] [Purpose] The diaphragm is kept parallel to the magnet body to ensure the vibration of the diaphragm. [Structure] A stopper member 8 made of an elastic body is integrally provided at an appropriate position on a surface of a vibrating plate 5 whose peripheral portion is fixed to a housing 2 via a plate spring 6 facing a magnet body 7. Even if the magnetic force acting on the diaphragm 5 becomes uneven due to the unevenness of the gap between the diaphragm 5 and the magnet body 7 when the diaphragm 5 is attached in a slightly inclined state, the diaphragm 5 Is the permanent magnet 1 of the magnet body 7 via the stopper member 8.
It comes into close contact with 2. Since the topper member 8 is formed of an elastic body, the elastic force pushes the diaphragm 5 back in a direction away from the magnet body 7, and the spring force of the leaf spring 6 fixing the diaphragm 5 to the housing 2. Is held at a position where the balance between the magnet body 7 and the permanent magnet 12 is maintained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an attenuator effective for attenuating vibrations of an automobile engine and the like, and more particularly to an active mount having a function for attenuating vibrations in a low frequency range and a function for attenuating vibrations in a high frequency range. It is a thing.

[0002]

[Prior art and its problems]

 Conventionally, various types of damping devices have been known which are mounted on an engine of an automobile or the like to effectively damp vibrations from the engine, for example, those shown in FIGS. 3 and 4. Is generally known.

That is, this damping device is a so-called active mount described in Japanese Patent Application Laid-Open No. 3-24338, and a screw portion 36 for connecting to the body side of an automobile is provided in the central portion. The connecting member 21, the substantially cylindrical outer shell 22 positioned outside the connecting member 21 at a predetermined interval, the inner peripheral side of the lower end opening of the outer shell 22, and the upper peripheral portion of the connecting member 21. The expansion spring 23 made of a rubber-like elastic body having a hollow conical shape that integrally connects the two, and the expansion spring 23 is located outside the expansion spring 23, and the outer peripheral side of the lower end opening of the outer shell 22 and the connection member 21. A bellows-like expandable bellows 24 connecting between the lower peripheral edge portion and a disc-shaped bellows 24 provided at the upper end opening portion of the outer shell 22 and having the outer peripheral edge portion fixed to the inner peripheral surface of the upper end opening portion. The leaf spring 26 and the inside of the leaf spring 26 are A diaphragm 25, which is provided in a state of facing the expansion spring 23 and has an outer peripheral edge portion fixed to an inner peripheral edge portion of a leaf spring 26, made of a substantially disc-shaped magnetizable material, and the diaphragm 25. The magnet is provided so as to face the upper surface, the outer peripheral edge portion is fixed to the upper end opening portion of the outer shell 22, and the screw portion 33 for connecting to the engine side of the automobile is provided in the center portion. An electromagnet main body 29 which is a connecting member made of a material, a permanent magnet 32 provided on the surface of the electromagnet main body 29 facing the vibrating plate 25, and an electromagnet coil 30 provided around the permanent magnet 32. A magnet 27 is provided, and the electromagnet coil 30 and the electromagnet body 29 constitute an electromagnet 31.

A predetermined gap is formed between the magnet body 27 and the vibrating plate 25, and a working chamber is sealed between the upper surface of the expansion spring 23 and the lower surface of the vibrating plate 25. 34 is formed, and a closed pressure regulating chamber 35 is formed between the lower surface of the expansion spring 23 and the upper surface of the bellows 24, and liquid is enclosed in both chambers 34 and 35. Further, the two chambers 34 and 35 are communicated with each other through a buffer hole 37 formed in the outer shell 22.

In the conventional active mount thus configured, the connecting member 29 connected to the engine side and the connecting member 21 connected to the body side are relatively disposed via the expansion spring 23. By displacing, the liquid in the action chamber 34 and the liquid in the pressure adjusting chamber 35 move to each other through the buffer hole 37, and by utilizing the flow resistance at this time, or by the magnet 27 By vibrating the diaphragm 25 slightly by the magnetic force of the permanent magnet 32 and the magnetic force of the electromagnet 31 to change the hydraulic pressure in the working chamber 34, from the low frequency to the high frequency input from the engine side. It is designed to effectively dampen a wide range of vibrations.

In this case, in a normal state, the force by which the permanent magnet 32 of the magnet body 27 pulls the diaphragm 25 and the spring force of the leaf spring 26 fixing the diaphragm 25 to the outer shell 22 are balanced. As a result, a predetermined gap is formed between the diaphragm 25 and the permanent magnet 32. On the other hand, when the electromagnet coil 30 of the magnet body 27 is energized to magnetize the electromagnet 31, The diaphragm 25 vibrates slightly due to the cooperation of the magnetic force of the electromagnet 31 and the magnetic force of the permanent magnet 32.

However, in the conventional active mount configured as described above, the diaphragm 25 may be attached to the magnet body 27 in a slightly inclined state due to manufacturing problems. It is considered that the gap between the permanent magnet 32 and the diaphragm 25 is not constant, and the magnetic force by the permanent magnet 32 is strong in the narrow gap portion, and the magnetic force by the permanent magnet 32 is weak in the wide gap portion. The inclination of the diaphragm 25 may be further promoted, and the diaphragm 25 may adhere to the permanent magnet 32 side (see FIG. 5).

As a result, even if the magnet body 27 is operated, it affects the vibration of the diaphragm 25, making it difficult to smoothly change the hydraulic pressure in the working chamber 34, and damping the input vibration. It is possible that the

The present invention solves the above-mentioned problems of the conventional ones. Even if the diaphragm is attached to the magnet body in a slightly inclined state due to manufacturing problems, the vibration is It is an object of the present invention to provide an active mount that can prevent the plate from closely contacting the magnet body side and can stably vibrate the vibrating plate stably at the time of operation of the magnet body.

[0010]

[Means for solving problems]

 In order to solve the above-mentioned problems, the present invention is directed to a diaphragm which is opposed to a magnet body mounted in a housing with a predetermined gap and whose peripheral edge is fixed to the housing through a leaf spring. However, in an active mount in which the hydraulic pressure in the working chamber that is in contact with the vibration plate changes due to slight vibrations when the magnet body is activated, the vibration plate faces the magnet body. A means is adopted in which a stopper member made of an elastic body is provided at an appropriate position on the surface, and the diaphragm does not come into direct contact with the magnet body side by the stopper member.

[0011]

[Action]

 In the present invention, by adopting the above-mentioned means, in the case where the diaphragm is assembled in a state of being inclined with respect to the magnet body due to manufacturing problems, and the diaphragm is trying to adhere to the magnet body side. Also in this case, the diaphragm does not directly contact the magnet body side, but contacts the magnet body side via the stopper member made of an elastic body. Then, at this time, the elastic force of the stopper member pushes the diaphragm back in a direction away from the magnet body, so that the spring force of the leaf spring fixing the diaphragm to the housing is balanced with the magnetic force of the magnet body. Will be retained. Therefore, the gap between the diaphragm and the magnet body is always kept constant.

[0012]

【Example】

 An embodiment of the present invention shown in the drawings will be described below. 1 and 2 show an embodiment of an active mount according to the present invention. FIG. 1 is a schematic sectional view showing the above, and FIG. 2 is a partially enlarged sectional view of the one shown in FIG.

That is, in the active mount shown in this embodiment, a connecting member 1 provided with a screw portion 16 for connecting to the body side of an automobile is provided in the central portion, and a predetermined space is provided outside the connecting member 1. An expansion made of a substantially conical cylindrical housing 2 and a hollow conical rubber-like elastic body for integrally connecting the inner peripheral side of the lower end opening of the housing 2 and the upper peripheral edge of the connecting member 1. The spring 3 and the bellows-shaped bellows 4 located outside the expansion spring 3 for connecting the outer peripheral side of the lower end opening of the housing 2 and the lower peripheral edge of the connecting member 1 to the housing 2. A vibrating plate 5 made of magnetizable soft iron or the like and having a substantially disc shape, which is provided at the upper end opening so as to face the expansion ring 3, and a circle which integrally connects the peripheral portion of the vibrating plate 5 to the housing 2. A plate-shaped leaf spring 6 The magnet body 7 is provided so as to face the upper surface of the diaphragm 5 and has a peripheral edge portion fixed to the upper end opening of the housing 2 and connected to the engine side of the vehicle, and the magnet of the diaphragm 5 described above. A stopper member 8 made of an elastic body is provided on the surface facing the body 7.

The magnet body 7 is made of a magnetizable material, and has a disc-shaped electromagnet body 9 which is a connecting member provided with a screw portion 13 for connecting to an engine of an automobile in a central portion. A disc-shaped permanent magnet 12 embedded in the central portion on the lower surface side of the electromagnet main body 9 and an electromagnet coil 10 embedded in the electromagnet main body 9 around the permanent magnet 12 are provided. The body 9 and the electromagnet coil 10 constitute an electromagnet 11.

A sealed working chamber 14 is formed between the upper surface of the expansion spring 3 and the lower surface of the vibration plate 5, and the lower surface of the expansion spring 3 and the upper surface of the bellows 4 are formed. A closed pressure regulating chamber 15 is formed between the chambers 14 and 15, and liquid is enclosed in the chambers 14 and 15, respectively, and the space between the chambers 14 and 15 is formed in the housing 2. The buffer holes 17 communicate with each other.

A stopper member 8 made of an elastic body is integrally formed by vulcanization bonding or the like at an appropriate position (a position corresponding to both ends of the magnet body 7) of a surface of the diaphragm 5 facing the magnet body 7. A slight gap is formed between the stopper member 8 and the magnet body 7.

In a normal state, the force of the permanent magnet 12 of the magnet body 7 pulling the diaphragm 5 and the spring force of the leaf spring 6 fixing the diaphragm 5 to the housing 2 are balanced. As a result, a predetermined gap is formed between the diaphragm 5 and the permanent magnet 12 of the magnet body 7, while the electromagnet coil 10 of the magnet body 7 is energized. When the electromagnet 11 is magnetized, the vibrating plate 5 vibrates slightly due to the cooperation of the magnetic force of the permanent magnet 12 and the magnetic force of the electromagnetic stone 11.

Next, the operation of the above will be described. First, the connecting member 9 on the magnet body 7 side of the active mount configured as described above is connected to the engine side (not shown) via the threaded portion 13 at the center thereof, and the connecting member 1 on the expansion spring 3 side is When the engine is operated by connecting it to the body side (not shown) via the threaded portion 16 at the center thereof, various vibrations from the engine are input to the active mount via the connecting member 9.

When the input vibration is low-frequency vibration, the connecting member 9 connected to the engine side and the connecting member 1 connected to the body side vibrate via the expansion spring 3. The liquid in the working chamber 14 and the liquid in the pressure adjusting chamber 15 move relative to each other through the buffer hole 17 of the housing 2 and the flow resistance at this time is used. Thus, it is possible to damp low-frequency vibration.

When the input vibration is in the high frequency range, the electromagnet 11 of the magnet body 7 is energized to magnetize the electromagnet 11, and the magnetic force of the electromagnet 11 at this time and the permanent magnet 12 By virtue of the cooperation with the magnetic force, the vibrating plate 5 is slightly vibrated to change the hydraulic pressure in the working chamber 14, whereby the vibration in the high frequency range can be effectively damped.

In the active mount according to the present invention configured as described above, the elastic body is placed at an appropriate position (position corresponding to both ends of the magnet body 7) on the surface of the diaphragm 5 facing the magnet body 7. Since the stopper member 8 made of is provided, the vibrating plate 5 is attached in a state in which the vibrating plate 5 is slightly inclined with respect to the magnet body 7 due to manufacturing problems, and the gap between the magnet body 7 and the vibrating plate 5 is Even if the magnetic force is not uniform and the magnitude of the magnetic force varies depending on the width of the gap, the vibrating plate 5 does not directly adhere to the permanent magnet 12 side of the magnet body 7, but adheres with the stopper member 8 interposed. become.

The elastic force of the stopper member 8 at this time pushes the vibrating plate 5 back in a direction away from the magnet body 7, and the magnetic force of the permanent magnet 12 and the leaf spring 6 fixing the vibrating plate 5 to the housing 2. It will be held at a position balanced with the spring force of, that is, at a position where a constant gap is formed.

Therefore, since the diaphragm 5 is always located at a position separated from the magnet body 7 by a certain gap, the diaphragm 5 should be sufficiently vibrated even when the magnet body 7 is operated. As a result, the hydraulic pressure in the working chamber 14 in contact with the vibration plate 5 can be sufficiently changed, so that the input vibration can be effectively damped.

In the above description, the stopper member 8 is provided at a position corresponding to both ends of the magnet body 7 on the surface of the diaphragm 5 facing the magnet body 7, but the invention is not limited to this. Instead, it may be provided at another position. The shape of the stopper member 8 is not particularly limited, and may be annularly provided at a position corresponding to the peripheral portion of the magnet body 7.

[0025]

[Effect of device]

 According to the present invention, the diaphragm is mounted in an inclined state with respect to the magnet body due to manufacturing problems due to the manufacturing problem, and the gap between the diaphragm and the magnet body is not constant. Even if there is a difference in the magnitude of the magnetic force acting between them due to the wideness of the gap, the vibrating plate is not attracted by the permanent magnets of the magnet body and does not come into direct contact with the permanent magnet side. The plate comes into close contact with the permanent magnet through a stopper member provided on the surface facing the magnet body. In this case, since the stopper member is formed of an elastic body, the elastic force pushes the diaphragm back from the permanent magnet, and the magnetic force of the permanent magnet and the leaf spring fixing the diaphragm to the housing side. It will be held in a position where it is kept in balance with the spring force. Therefore, a constant gap is always formed between the magnet body and the diaphragm, so when the magnet body is operated, the vibrator vibrates as set. Therefore, this has an excellent effect that the input vibration can be effectively damped.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an active mount according to the present invention.

FIG. 2 is a partially enlarged sectional view of what is shown in FIG.

FIG. 3 is a schematic cross-sectional view showing an example of a conventional active mount.

FIG. 4 is a partially enlarged cross-sectional view of what is shown in FIG. 3 and is an explanatory view showing a state where the diaphragms are kept in parallel.

5 is a partially enlarged cross-sectional view of what is shown in FIG. 3, and is an explanatory view showing a state where the diaphragm is tilted.

[Explanation of symbols]

 1, 21 ...... Connection member 2 ...... Housing 3, 23 ...... Expansion spring 4, 24 ...... Bellows 5, 25 ...... Vibrating plate 6, 26 ...... Leaf spring 7, 27 ...... Magnet body 8 ...... Stopper member 9, 29 ... Connection member (electromagnet main body) 10, 30 ... Electromagnet coil 11, 31 ... Electromagnet 12, 32 ... Permanent magnet 13, 16, 33, 36 ... Screw portion 14, 34 ... Working chamber 15, 35 ... Pressure regulation chamber 17, 37 ... Buffer hole 22 ... Outer shell

Claims (1)

[Scope of utility model registration request] 1. A magnet body (7) mounted on a housing (2) is opposed to the magnet body (7) with a predetermined gap, and a peripheral edge portion is fixed to the housing (2) through a leaf spring (6). By vibrating the vibrating plate (5) slightly while the magnet body (7) is operating, the hydraulic pressure in the working chamber (14) in contact with the vibrating plate (5) is changed. In the active mount, a stopper member (8) made of an elastic body is provided at an appropriate position on the surface of the vibration plate (5) facing the magnet body (7), and the stopper member (8) is provided.
The active mount is characterized in that the vibrating plate (5) is not directly adhered to the magnet body (7) side.