JP3887187B2 - Active anti-vibration support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an active vibration isolating support in which at least a part of a liquid chamber is partitioned by an elastic body and a movable member, and vibrations input from the vibrating body via the elastic body are buffered by driving the movable member with an actuator. Relates to the device.
[0002]
[Prior art]
Such an active vibration isolating support device is known from JP-A-11-230237.
[0003]
In this active vibration isolating support device, the lower surface of a movable member that is driven by an electromagnetic actuator to change the volume of the liquid chamber is supported by the upper surface of an annular leaf spring whose outer peripheral portion is fixed to the case. As the armature is excited to attract the armature, the movable member connected to the armature is moved downward against the elastic force of the leaf spring to increase the volume of the liquid chamber, and the coil of the actuator is By degaussing and releasing the attraction of the armature, the movable member is moved upward by the elastic force of the leaf spring to reduce the volume of the liquid chamber.
[0004]
[Problems to be solved by the invention]
By the way, in order to change the frequency of the current supplied to the coil of the actuator to vibrate the movable member at a predetermined frequency, it is necessary that the leaf spring and the movable member are always in contact with each other. For this purpose, it is necessary to apply an initial load in the direction in which the leaf spring comes into contact with the movable member. However, since the leaf spring formed in an annular shape slightly changes by slightly deforming the leaf spring, The initial load changes greatly due to excessive dimensional errors and mounting errors, and the initial load becomes excessive and the smooth suction of the movable member by the actuator is hindered, or the initial load becomes excessive and the leaf spring and the movable member The air gap between the actuator yoke and the armature may fluctuate depending on the magnitude of the initial load.
[0005]
The present invention has been made in view of the above-described circumstances, and an object thereof is to appropriately set an initial load of a spring that supports a movable member that changes the volume of a liquid chamber.
[0006]
[Means for Solving the Problems]
To achieve the above object, a first aspect of the invention, a mounting portion attached to the vibrating body, a support portion attached to the frame, an elastic member for connecting the mounting portion and the support portion, at least a portion of an elastic body , A movable member that divides at least another part of the liquid chamber, an electromagnetic actuator that vibrates the movable member, and a first spring that contacts the movable member and supports the movable member In an active vibration isolating support device comprising: an upper yoke housed and fixed in a support portion; and an elastic body holder that is fitted and fixed in the support portion and holds a movable member via another elastic body. An outer peripheral portion of a first spring made of a leaf spring is sandwiched and fixed therebetween, and the first spring is a second spring made of a coil spring that urges the first spring in a direction to contact the movable member. And the movable member It is characterized in.
[0007]
According to the above configuration, the first spring that supports the movable member that vibrates by the actuator is urged in the direction in which the second spring comes into contact with the movable member to generate an appropriate initial load, so the initial load becomes excessive. Thus, it is possible to prevent the smooth drive of the movable member by the actuator from being hindered, or the initial load from becoming excessively small and the first spring and the movable member from separating . In particular, the first spring that supports the movable member is a leaf spring, and the second spring that biases the first spring in a direction to contact the movable member is a coil spring. The disadvantage of the leaf spring, which is difficult to finely adjust the load, can be compensated by a coil spring that can easily adjust the initial load, so that both the reliable support of the movable member and the fine adjustment of the initial load can be achieved.
[0008]
Further, the invention of claim 2 is characterized in that, in addition to the structure of claim 1, the first spring is slidably abutted on the movable member , and according to this , the inclination of the movable member and an assembly error are caused. Even if a positional deviation occurs between the first spring and the movable member, it is possible to prevent an unnecessary load from acting between the first spring and the movable member due to relative movement of the first spring and the movable member, and to ensure a smooth operation of the movable member. Can do.
[0009]
The invention of claim 3, in addition to the first aspect, the actuator is provided with a armature driven by being connected to the movable member coil, the armature is a second spring disposed between the first spring According to this , the armature provided on the actuator and driven by the coil is pressed against the stopper by the second spring disposed between the first spring and the stopper. Therefore, the number of parts can be reduced by fixing the amateur without using a special fixing member.
[0010]
The engine E of the embodiment corresponds to the vibrating body of the present invention, the vehicle body frame F of the embodiment corresponds to the frame of the present invention, and the mounting bracket 11 of the embodiment corresponds to the mounting portion of the present invention. The first elastic body 14 corresponds to the elastic body of the present invention, the upper casing 18 and the lower casing 19 of the embodiment correspond to the support portion of the present invention, and the first liquid chamber 23 of the embodiment corresponds to the liquid chamber of the present invention. The leaf spring 33 and the coil spring 34 of the embodiment correspond to the first spring and the second spring of the present invention, respectively.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0012]
1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an active vibration isolating support apparatus, and FIG. 2 is a sectional view taken along line 2-2 of FIG.
[0013]
The active vibration isolating support device M shown in FIGS. 1 and 2 is for elastically supporting an engine E of a vehicle on a vehicle body frame F, an engine speed sensor Sa for detecting the engine speed, and the active vibration isolating support apparatus M. It is controlled by an electronic control unit U connected to a load sensor Sb (or an acceleration sensor Sc that detects acceleration on the vehicle body side) that detects a load input to the vehicle body via the anti-vibration support device M.
[0014]
The active vibration isolating support device M has a substantially axisymmetric structure with respect to the axis L, and has an inner cylinder 12 welded to a plate-like mounting bracket 11 coupled to the engine E, and an outer periphery of the inner cylinder 12. The outer cylinder 13 is coaxially arranged, and the upper and lower ends of the first elastic body 14 made of thick rubber are joined to the inner cylinder 12 and the outer cylinder 13 by vulcanization adhesion. An orifice forming member 15 is fixed to the inner peripheral surface of the outer cylinder 13, and an annular orifice 16 is formed between the orifice forming member 15 and the outer cylinder 13. A diaphragm-like second elastic body 17 is disposed so as to surround the outer periphery of the outer cylinder 13, and the outer periphery thereof is covered with a cylindrical upper casing 18. The upper end of the second elastic body 17 is sandwiched between the upper end of the upper casing 18 and the upper end of the outer cylinder 13 and fixed by caulking, and the lower end of the second elastic body 17 is between the lower end of the upper casing 18 and the lower end of the outer cylinder 13. It is sandwiched and fixed by caulking. Further, a cylindrical lower casing 19, an annular third elastic body holder 20, and the orifice forming member 15 are sandwiched and fixed to the lower end of the upper casing 18 by caulking.
[0015]
The outer circumference of the third elastic body 21 is joined to the inner circumference of the third elastic body holder 20 by vulcanization adhesion, and the outer circumference of the dish-shaped movable member 22 is joined to the inner circumference of the third elastic body 21 by vulcanization adhesion. The Therefore, the first liquid chamber 23 is defined by the first elastic body 14, the orifice forming member 15, the third elastic body 21, and the movable member 22, and the second liquid chamber 24 is defined between the outer cylinder 13 and the second elastic body 17. Thus, an air chamber 25 is defined between the second elastic body 17 and the upper casing 18. The first liquid chamber 23 communicates with the orifice 16 through a through hole 15 a provided in the orifice forming member 15, and the orifice 16 communicates with the second liquid chamber 24 through a through hole 13 a provided in the outer cylinder 13. The air chamber 25 communicates with the atmosphere via a through hole 18 a provided in the upper casing 18 so as not to prevent the deformation of the second elastic body 17.
[0016]
Therefore, when the first elastic body 14 is deformed downward due to vibration from the engine E and the volume of the first liquid chamber 23 is reduced, the liquid pushed out from the first liquid chamber 23 has the through holes 15a, the orifices 16 and the through holes. The diaphragm-like second elastic body 17 that flows into the second liquid chamber 24 through 13a and faces the second liquid chamber 24 is deformed outward. On the contrary, when the first elastic body 14 is deformed upward by the vibration from the engine E and the volume of the first liquid chamber 23 is increased, the liquid sucked out from the second liquid chamber 24 is passed through the through-hole 13a, the orifice 16 and the through-hole. The diaphragm-like second elastic body 17 that flows into the first liquid chamber 23 through the hole 15a and faces the second liquid chamber 24 is deformed inward.
[0017]
A lower yoke 26 and an upper yoke 27 are accommodated in the lower housing 19, and a coil 29 wound around the bobbin 28 and arranged so as to surround the axis L is supported between the lower yoke 26 and the upper yoke 27. . A triangular pyramid-shaped armature 30 is slidably fitted to a shaft portion 22a protruding from the lower surface of the movable member 22 along the axis L, and abuts against a stopper 31 provided at the tip of the shaft portion 22a. A cylindrical guide member 32 fixed to the lower surface of the amateur 30 is slidably fitted to the outer periphery of the guide portion 26a of the lower yoke 26. The armature 30 is moved along the axis L by the guide member 32 and the guide portion 26a. Be guided to move. The outer peripheral part of the leaf spring 33 formed in an annular shape is fixed between the third elastic body holder 20 and the upper yoke 27, and the inner peripheral part slidably contacts the lower surface of the movable member 22. A coil spring 34 is disposed between the upper surface of the armature 30 and the lower surface of the inner peripheral portion of the leaf spring 33 in a compressed state. The coil spring 34 generates an initial load that presses the leaf spring 33 against the lower surface of the movable member 22.
[0018]
The yokes 26 and 27, the coil 29, the armature 30, the leaf spring 33 and the coil spring 34 constitute the actuator A of the active vibration isolating support device M. When the coil 29 of the actuator A is in a demagnetized state, the armature 30 is separated upward from the yokes 26 and 27. When the coil 29 is excited from this state, the armature 30 is attracted to the yokes 26 and 27, and the movable member 22 with the shaft portion 22a pulled is moved downward against the elastic force of the leaf spring 33 and the coil spring 34.
[0019]
Thus, when low-frequency engine shake vibration occurs while the automobile is running, the first elastic body 14 is deformed by the load input from the engine E, and the volume of the first liquid chamber 23 changes. The liquid flows back and forth between the first liquid chamber 23 and the second liquid chamber 24 that are connected to each other. When the volume of the first liquid chamber 23 is enlarged / reduced, the volume of the second liquid chamber 24 is reduced / expanded accordingly, and the volume change of the second liquid chamber 24 is absorbed by the elastic deformation of the second elastic body 17. Is done. At this time, the shape and size of the orifice 16 and the spring constant of the first elastic body 14 are set so as to exhibit a high spring constant and a high damping force in the frequency region of the engine shake vibration. The vibration transmitted to F can be effectively reduced.
[0020]
In the frequency region of the engine shake vibration, the above performance can be obtained regardless of whether the actuator A is operating or not.
[0021]
When vibration having a higher frequency than the engine shake vibration, that is, idle vibration or booming sound vibration caused by rotation of the crankshaft of the engine E occurs, the inside of the orifice 16 connecting the first liquid chamber 23 and the second liquid chamber 24 Since the liquid becomes stick and cannot exhibit the anti-vibration function, the actuator A is driven to exhibit the anti-vibration function.
[0022]
The electronic control unit U controls energization of the coil 29 of the actuator A based on signals from the engine speed sensor Sa and the load sensor Sb (or acceleration sensor Sc). Specifically, when the engine E is biased downward due to vibration and the volume of the first fluid chamber 23 decreases and the fluid pressure increases, the coil 29 is excited to attract the armature 30. As a result, the armature 30 moves downward together with the movable member 22 while pulling the leaf spring 33 and the coil spring 34, and deforms the third elastic body 21 having the inner periphery connected to the movable member 22 downward. Accordingly, since the volume of the first fluid chamber 23 is increased and the increase in fluid pressure is suppressed, the active vibration isolating support device M is an active support that prevents downward load transmission from the engine E to the vehicle body frame F. Generate power.
[0023]
Conversely, when the engine E is biased upward by vibration and the volume of the first fluid chamber 23 increases and the fluid pressure decreases, the coil 29 is demagnetized and the suction of the armature 30 is released. As a result, the armature 30 moves upward together with the movable member 22 by the elastic force of the leaf spring 33 and the coil spring 34, and deforms the third elastic body 21 having the inner periphery connected to the movable member 22 upward. Accordingly, since the volume of the first fluid chamber 23 is reduced and the decrease in fluid pressure is suppressed, the active vibration isolating support device M is an active support that prevents upward load transmission from the engine E to the vehicle body frame F. Generate power.
[0024]
By the way, when it is going to generate | occur | produce the initial load which makes the upper surface of the leaf | plate spring 33 contact | abut to the lower surface of the movable member 22 with the elasticity of leaf | plate spring 33 itself, finely adjust an initial load with the leaf | plate spring 33 with a big spring constant. There is a problem that the initial load varies due to the dimensional accuracy of the leaf spring 33 itself or the dimensional accuracy and position accuracy of the movable member 22. However, in this embodiment, since the initial load is generated by the elastic force of the coil spring 34 having a small spring constant and excellent linearity between displacement and load, the initial load can be easily adjusted to an optimum size. can do.
[0025]
As a result, the initial load for bringing the leaf spring 33 into contact with the movable member 22 becomes excessive, and the smooth suction of the movable member 22 by the actuator A is hindered, or the initial load becomes excessive and the leaf spring 33 and the movable member 22 are reduced. Is reliably prevented from moving apart, and the balance position of the movable member 22 in the direction of the axis L, that is, the position where the elastic forces of the coil spring 34, the leaf spring 33 and the third elastic body 21 are balanced is stable. In addition, the air gap between the armature 30 and the yokes 26 and 27 can be maintained at an appropriate size. Since the coil spring 34 also has a function of urging the armature 30 downward and abutting and fixing the armature 30 to the stopper 31, no special fixing means for fixing the armature 30 is required, and the number of parts is reduced. Can contribute.
[0026]
Further, since the inner peripheral portion of the leaf spring 33 is not fixed to the movable member 22 and is slidable with respect to the movable member 22, the leaf spring 33 and the movable member 22 can be moved depending on the inclination of the movable member 22 or an assembly error. Even if the position shift occurs, an unnecessary load is applied to the movable member 22 from the leaf spring 33, and the smooth operation is not hindered.
[0027]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0028]
For example, in the embodiment, the active vibration isolation support device M that supports the engine E of the automobile is illustrated, but the active vibration isolation support device of the present invention can be applied to support other vibration bodies such as machine tools. .
[0029]
Further, when it is not necessary to reduce the vibration in the engine shake region by the active vibration isolation support device M, the second liquid chamber 24, the orifice 16 and the second elastic body 17 can be omitted.
[0030]
【The invention's effect】
As described above, according to the present invention, the first spring that supports the movable member that vibrates by the actuator is urged in the direction in which the second spring abuts the movable member to generate an appropriate initial load. Therefore, it is possible to prevent the first member and the movable member from separating from each other due to the excessive increase in the amount of the first spring and the smooth drive of the movable member by the actuator being hindered . In addition, the first spring that supports the movable member is a leaf spring, and the second spring that biases the first spring in a direction to contact the movable member is a coil spring. The disadvantage of the leaf spring, which is difficult to make a delicate adjustment, is compensated by a coil spring that can easily adjust the initial load, so that both the reliable support of the movable member and the fine adjustment of the initial load can be achieved.
[0031]
In particular , according to the second aspect of the present invention, since the first spring is slidably contacted with the movable member, even if a positional deviation occurs between the first spring and the movable member due to an inclination or an assembly error of the movable member. The relative movement of the first spring and the movable member can prevent an unnecessary load from acting between them, and can ensure the smooth operation of the movable member.
[0032]
In particular , according to the invention of claim 3 , the armature provided on the actuator and driven by the coil is fixed by being pressed against the stopper by the second spring disposed between the first spring and the armature. The number of parts can be reduced by fixing the amateur without using a member.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an active vibration isolating support device. FIG. 2 is a sectional view taken along line 2-2 of FIG.
A Actuator E Engine (vibrating body)
F Body frame (frame)
11 Mounting bracket (Mounting part)
14 First elastic body (elastic body)
18 Upper casing (support)
19 Lower casing (supporting part)
22 Movable member 23 First liquid chamber (liquid chamber)
29 Coil 30 Amateur 31 Stopper 33 Leaf spring (first spring)
34 Coil spring (second spring)

Claims (3)

An attachment portion (11) attached to the vibrating body (E);
Support portions (18, 19) attached to the frame (F);
An elastic body (14) connecting the mounting portion (11) and the support portion (18, 19);
A liquid chamber (23) at least partially partitioned by an elastic body (14);
A movable member (22) defining at least another part of the liquid chamber (23);
An electromagnetic actuator (A) for vibrating the movable member (22);
In the active vibration isolating support device including the first spring (33) that contacts the movable member (22) and supports the movable member (22),
The upper yoke (26) housed and fixed in the support portion (18, 19), and the movable member (fitted and fixed in the support portion (18, 19) via another elastic body (21)). 22) between the elastic body holder (20) holding the outer peripheral portion of the first spring (33) made of a leaf spring and fixed vertically,
The first spring (33), between the first spring (33) second spring made of a coil spring for urging contact with the direction to the movable member (22) to (34), a movable member (22) An anti-vibration support device characterized by being sandwiched between the two .   The active vibration isolating support device according to claim 1, characterized in that the first spring (33) slidably contacts the movable member (22).   The actuator (A) includes an armature (30) connected to the movable member (22) and driven by a coil (29). The armature (30) is a second spring disposed between the armature (30) and the first spring (33). 2. The active vibration isolating support device according to claim 1, wherein the device is fixed by being pressed against a stopper (31) by a spring (34).

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