JPH0649837U - Active mount - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the amplitude of the diaphragm and improve the damping characteristics against vibration. A vibration plate 5 made of a magnetizable material is attached to a housing 2 via a plate spring 6, and a permanent magnet 12 is formed so that a predetermined gap is formed between the vibration plate 5 and the vibration plate 5.
The magnet body 7 including the electromagnet 11 and the electromagnet 11 is attached to the housing 2. The portion of the electromagnet 11 facing the gap of the electromagnet main body 9 is formed in a single plane over the entire circumference, and the portion of the electromagnet main body 9 facing the gap of the diaphragm 5 facing this is formed. An annular convex portion protruding in the direction is formed. The upper surface of the convex portion is formed into a single plane, and both side surfaces are formed into tapered surfaces having appropriate taper angles. When the diaphragm approaches the direction of the magnet body, the axial side components of the magnetic force can be reduced by the both side surfaces formed on the convex tapered surface, so the increase of the magnetic force with respect to the change (decrease) of the gap is small. Therefore, the amplitude of the diaphragm can be significantly increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a damping device that is effective in damping the vibration of an automobile engine or the like, and in particular, is designed to damp the vibration by vibrating the diaphragm by the operation of the magnet body and changing the hydraulic pressure in the working chamber. It concerns active mounts.

[0002]

[Prior art and its problems]

 Conventionally, as a damping device for damping the vibration of an engine of an automobile or the like, those shown in FIGS. 5 and 6 are 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 vehicle body side is provided in the center 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 outer peripheral edge portion fixed to the inner peripheral surface of the upper end opening portion is provided at the upper end opening portion of the outer shell 22. 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. The magnet body 27 is provided, and the electromagnet coil 30 and the electromagnet body portion 29 constitute an electromagnet 31.

A predetermined gap is formed between the magnet body 27 and the vibrating body 25, and a seal is provided between the upper surface of the expansion spring 23 and the lower surface of the vibrating plate 25. A working chamber 34 is formed, and a sealed pressure adjusting 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. The spaces 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 21 connected to the engine side and the connecting member 29 connected to the body side are relatively disposed via the expansion spring 23. By the displacement, the liquid in the working chamber 34 and the liquid in the pressure adjusting chamber 35 move to each other through the buffer hole 37, and the flow resistance at this time is used, or the magnet 27 The vibrating plate 25 is slightly vibrated by the cooperation of the magnetic force of the permanent magnet 32 and the magnetic force of the electromagnet 31, and the hydraulic pressure in the working chamber 34 in contact with the vibrating plate 25 is changed, so that various kinds of input from the engine side can be performed. It is designed to damp vibrations.

Here, the current flow direction of the electromagnet coil 30 that causes the magnetic flux in the same direction as the magnetic flux direction of the permanent magnet 32 is +, and the current flow direction of the electromagnet coil 30 that causes the magnetic flux in the opposite direction is +. Is represented by −, and the relationship between the “magnetic force-gap line” of the diaphragm and the “gap-spring line” of the leaf spring supporting the diaphragm is shown in FIG. 7.

In FIG. 7, the intersection point of the "magnetic force-gap line" of the diaphragm and the "gap-spring line" of the leaf spring when a current is passed in the + direction is S1 and "" when a current is passed in the-direction. Let S2 be the intersection of the magnetic force-gap line and the gap-spring line, and let S0 be the intersection of the magnetic force-gap line and the gap-spring line when the current value is 0. The amplitude is S0-S1 in the direction of compressing the gap and S2-S0 in the direction of expanding the gap with S0 as the center.

That is, when the current value is 0, the magnetic force Fm 0 of only the permanent magnet 32 acts on the diaphragm 25, and the leaf spring 26 bends in response to this magnetic force, so that the inside of the leaf spring 26 balances with the magnetic force Fm 0. A force is generated and the diaphragm 25 is held at the position of the gap S0.

On the other hand, when a current in the + direction is applied to the electromagnet coil 30, the magnetic force of the permanent magnet 32 and the magnetic force Fm1 of the electromagnet 31 act on the diaphragm 25, and the leaf spring 26 bends in response to this magnetic force. As a result, a reaction force that balances the magnetic force Fm1 is generated inside the leaf spring 26. In this case, since the relationship of Fm1> Fm0 is satisfied, the leaf spring 26 bends further than in the steady state, and the vibrating plate 25 has a gap. It will be held at the position of S1.

When a negative current is applied to the electromagnet coil 30, a magnetic force of the permanent magnet 32 and a magnetic force Fm2 of the electromagnet 31 act on the diaphragm 25, and the leaf spring 26 is bent by the magnetic force. Causes a reaction force that balances the magnetic force Fm2 inside the leaf spring 26. In this case, since the relationship of Fm2 <Fm0 is satisfied, the deflection of the leaf spring 26 is reduced compared to the steady state, and the diaphragm 25 is positioned at the position of the gap S2. Will be held in.

By continuously changing the flow direction of the current flowing through the electromagnet coil 30 in this manner, the diaphragm 25 can be slightly vibrated with the amplitude of S1 to S2. In this case, S1 to S2 In order to improve the performance of the mount, it is important to make the distance of S1 to S0 the same as that of S0 to S2 while making the distance larger.

However, in the conventional active mount configured as described above, the portion of the electromagnet body 29 facing the gap and the portion of the diaphragm 25 facing the gap facing the gap are parallel to each other. Since it is formed on a horizontal plane, the magnetic force rises as the gap becomes narrower, as shown in FIG. Therefore, in order to have the intersection S1, the spring constant of the leaf spring 26 must be increased. Further, if the leaf spring 26 having a small spring constant is used to gain the amplitude of S0 to S1, the amplitude of S0 to S2 becomes small, resulting in unbalanced characteristics and deterioration of vibration damping. There was a problem that it did.

The present invention solves the above-mentioned problems of the conventional one, and changes the material, shape, etc. of the permanent magnet and electromagnet of the magnet body or the material, shape, etc. of the diaphragm drastically. It is an object of the present invention to provide an active mount that can significantly increase the amplitude of the diaphragm without causing the vibration.

[0014]

[Means for solving problems]

 In order to solve the above-mentioned problems, the present invention is mounted on a housing, a magnet body composed of a permanent magnet and an electromagnet, and a housing mounted on the housing via a leaf spring, and the magnet body and a predetermined magnet. A vibrating plate made of a magnetizable material facing each other across a gap, and the permanent magnet of the magnet body and the electromagnet cooperate to vibrate the vibrating plate slightly, and the hydraulic pressure in the working chamber in contact with the vibrating plate. In the active mount that is designed to change, the part of the magnet body facing the gap of the electromagnet is formed in a single plane, and the part facing the gap of the diaphragm facing the gap is formed. A means is adopted in which the surface facing the electromagnet is a single flat surface and both side surfaces are formed with at least one convex portion of a tapered surface having an appropriate taper angle.

[0015]

[Action]

 By adopting the above-mentioned means in this invention, the magnetic flux generated on the magnetic circuit increases as the diaphragm approaches the magnet body, and the upper surface formed on the single plane of the convex portion of the diaphragm is increased. First, it reaches the saturation region, and then the magnetic flux on both side surfaces formed on the tapered surface with an appropriate taper angle increases, but in this case, the acting magnetic force is distributed in the axial direction and the radial direction, The increase in the magnetic force in the axial direction is smaller than the magnetic force acting on the upper surface. Therefore, it is possible to suppress the increase in the magnetic force with respect to the change (decrease) of the gap to be small.

[0016]

【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 whole, 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 a substantially disc-shaped magnetizable material and provided in the upper end opening so as to face the expansion ring 3, and an annular plate for integrally connecting the peripheral edge of the vibrating plate 5 to the housing 2. The spring 6 and the vibration The magnet body 7 is provided so as to face the upper surface of the moving plate 5 with a predetermined gap therebetween and has a peripheral edge portion fixed to the upper end opening portion of the housing 2 and connected to the engine side of the automobile.

A sealed working chamber 14 is formed between the upper surface of the expansion spring 3 and the lower surface of the vibrating plate 5, and a lower surface of the expansion spring 3 and an upper surface of the bellows 4 are formed. A sealed pressure regulating chamber 15 is formed between the chambers, liquid is enclosed in both chambers, and both chambers communicate with each other through a buffer hole 17 formed in the housing 2. It is supposed to do.

The magnet body 7 is made of a magnetizable material, and is a disc-shaped electromagnet body portion 9 which is a connecting member provided with a screw portion 13 for connecting to an engine of an automobile on the upper surface side of the central portion. A disk-shaped permanent magnet 12 mounted in a recess formed in the central portion on the lower surface side of the electromagnet body 9, and the electromagnet body 9 at the peripheral edge of the permanent magnet 12. The electromagnet coil 10 is mounted in the annular groove portion, and the electromagnet body 9 and the electromagnet coil 10 form an electromagnet 11.

In this case, the portion of the electromagnet body 9 of the magnet body 7 that faces the gap (the peripheral portion on the lower surface side) is formed as a single flat surface 9a over the entire circumference, and An annular convex portion 8 protruding in the direction of the electromagnet main body portion 9 is formed at a portion (upper peripheral portion) of the vibrating plate 5 facing the single flat surface 9a. Upper surface 8a is formed into a single plane, and both side surfaces 8b and 8c are formed into tapered surfaces having an appropriate taper angle (tapered surface forming an angle of 60 degrees with the horizontal line). Is formed about 1/3 of the width of the single plane 9a.

Next, the operation of the above will be described. First, the direction of current flow of the electromagnet coil 10 that produces magnetic flux in the same direction as the direction of magnetic flux of the permanent magnet 12 is +, and the direction of current flow of electromagnet coil 10 that produces magnetic flux in the opposite direction is −, and the diaphragm 5 4 shows the relationship between the "magnetic force-gap line" and the "gap-vane line" of the leaf spring 6.

In FIG. 4, the broken line is the conventional one and the solid line is according to this embodiment, and the intersection of the “magnetic force-gap line” and the “gap-spring line” when a current is passed in the + direction is S 1 ′. Let S2 'be the intersection of the "magnetic force-gap line" and the "gap-spring line" when a current is applied in the, -direction. The intersection is S0 '.

As described above, the portion of the electromagnet main body 9 facing the gap is formed on the single flat surface 9a over the entire circumference, and the diaphragm 5 facing the same is formed. A convex portion 8 projecting toward the electromagnet body 9 is formed over the entire circumference at the portion facing the gap. In this case, the upper surface 8a of the convex portion 8 is a single flat surface, and both side surfaces 8b, Since 8c is formed on a tapered surface having an appropriate taper angle (60 degrees), the magnetic flux increases the magnetic flux generated on the magnetic circuit as the diaphragm 5 approaches the magnet body 7 due to the action of the magnetic force. The upper surface 8a formed on the single flat surface of the convex portion 8 of the diaphragm 5 first reaches the saturation region of the magnetic characteristics, and then the side surfaces 8b and 8c formed on the tapered surface of the magnet body 7 The magnetic flux going in the direction will increase.

In this case, since the both side surfaces 8b and 8c are formed into tapered surfaces, the acting magnetic force is divided into the axial component and the radial component, and the axial magnetic force is more than the magnetic force acting on the upper surface 8a. Less. Therefore, the increase in the magnetic force in the axial direction with respect to the change (decrease) in the gap can be suppressed to be small.

Therefore, the conventional one has a characteristic that the magnetic force rises as the gap becomes narrower as shown in FIG. 7 or FIG. Since the increase in magnetic force can be suppressed to a small level, the "magnetic force-gap line" can be brought closer to the horizontal line.

As a result, for example, even when a leaf spring having the same spring constant as the conventional one is used so that the amplitudes of S1 ′ to S0 ′ are the same as those of the conventional one, the amplitudes of S0 ′ to S2 ′ are the same. Can be significantly increased compared to the conventional one. Further, since the increase in the magnetic force due to the change (decrease) in the gap can be suppressed to a small value, it is possible to use a leaf spring having a small spring constant, so that the amplitude can be greatly increased. Therefore, the performance as a mount can be significantly improved.

As described above, in the active mount according to this embodiment, the increase of the magnetic force with respect to the change (decrease) of the gap can be suppressed to a small level. Therefore, the materials of the permanent magnet and the electromagnet coil of the magnet body are small. The amplitude can be greatly increased without changing the shape or the like. Also, since it is possible to use a leaf spring having a small spring constant, the amplitude can be greatly increased also by this.

In the above description, in the portion of the diaphragm 5 facing the gap, the upper surface 8a is a single flat surface, and the both side surfaces 8b and 8c are convex taper surfaces with appropriate taper angles (60 degrees). Although one part 8 is formed, it may be formed on a tapered surface having a taper angle other than 60 degrees, and the number is not limited to one, and two or two or more may be formed.

[0029]

[Effect of device]

 This device is constructed as described above, and the portion of the magnet body facing the gap of the electromagnet is formed on a single plane, and the portion of the diaphragm facing the gap facing the gap of the electromagnet is oriented in the direction of the magnet body. The taper angle of the tapered surface is set to an appropriate value by forming the protruding convex portion, and by forming the upper surface of this convex portion into a single flat surface and forming both side surfaces into tapered surfaces with appropriate taper angles. By doing so, the increase in magnetic force with respect to the change (decrease) in the gap can be suppressed to a small level. Therefore, the shapes and materials of the permanent magnets and electromagnets of the magnet body or the shapes and materials of the diaphragm can be changed significantly. Without this, the amplitude of the diaphragm can be greatly increased. Also, since it is possible to use a leaf spring with a low spring constant, this also allows the amplitude of the diaphragm to be greatly increased, and a mount with excellent damping properties can be provided. It has an excellent effect such as

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an entire 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 partial explanatory diagram of FIG.

FIG. 4 is an explanatory diagram showing a relationship between a magnetic force-gap line and a spring-gap line shown in FIG. 1.

FIG. 5 is a schematic sectional view showing an entire example of a conventional active mount.

6 is a partially enlarged cross-sectional view of what is shown in FIG.

FIG. 7 is an explanatory diagram showing the relationship between the magnetic force-gap line and the spring-gap line shown in FIG.

[Explanation of symbols]

 1, 21 ...... Connection member 2 ...... Housing 3, 23 ...... Expansion spring 4, 24 ...... Bellows 5, 25 ...... Vibration plate 6, 26 ...... Leaf spring 8 ...... Convex part 8a ...... Top surface 8b, 8c ...... Side surface 7, 27 ...... Magnetic body 9, 29 ...... Coupling member (electromagnet main body) 9a ...... Single plane 10, 30 ...... Electromagnetic coil 11, 31 ...... Electromagnet 12, 32 ...... Permanent magnet 13 , 16, 33, 36 ... screw portion 14, 34 ... working chamber 15, 35 ... pressure adjusting 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) and comprising a permanent magnet (12) and an electromagnet (11), and mounted on the housing (2) via a leaf spring (6). And a vibrating plate (5) made of a magnetizable material and facing the magnet body (7) with a predetermined gap therebetween, and the permanent magnet (12) of the magnet body (7).
And an electromagnet (11) cooperate with each other to slightly vibrate the vibrating plate (5) to change the hydraulic pressure in the working chamber (14) in contact with the vibrating plate (5). A portion of the electromagnet (11) of the magnet body (7) that faces the gap is formed on a single plane (9a), and a portion of the diaphragm (5) that faces the gap faces the gap. The surface facing the electromagnet (11) is a single flat surface (8a), and both side surfaces (8b) (8c) are formed with at least one convex portion (8) of a tapered surface having an appropriate taper angle. Active mount.