JPH08156610A - Engine mount - Google Patents

Abstract

PURPOSE: To provide an engine mount which can favorably cut off transmission of engine vibration to a car body and also is excellent in vibration resistance. CONSTITUTION: A movable member 56 is driven by an actuator part 60 to reciprocatingly move in a communication hole 53a and thereby adjust pressure inside a main liquid chamber 51 so as to damp engine vibration. Since stoppers 81 and 84 are respectively pressed in both ends in the axial direction of a partition plate 53, when excessive vibration is applied to an engine mount 30 and an amplitude of the movable member 56 is enlarged, the movable member 56 is locked by the stoppers 81 and 84 so as to prevent falling off of the movable member 56. Also, the movable member 56 is locked at two points by the stoppers 81 and 84, shaft deviation of the movable member 56 is restrained in the state of locking and communication between the main liquid chamber 51 and an auxiliary liquid chamber 52 is retained, and therefore, an effect for damping engine vibration is exhibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine mount disposed between a vehicle body and an engine for damping engine vibration, and more particularly to a hydraulically controlled electronically controlled engine mount.

[0002]

2. Description of the Related Art Recently, in order to improve the performance of a vehicle, it is desired to reduce the engine vibration transmitted to passengers in the vehicle by attenuating the engine vibration during running and idle operation. In response to such demands, engine vibration is being satisfactorily damped by electronically controlling the damping characteristics of the engine mount. For example, a main liquid chamber and a sub liquid chamber communicating with the main liquid chamber are provided in the lower portion of the engine support portion of the engine mount, and the movable member is vibrated by an actuator serving as a drive means outside the main liquid chamber to move the main liquid chamber. By changing the volume, periodic hydraulic vibration is generated in the main liquid chamber. The hydraulic control type engine mount that controls the phase difference between the hydraulic vibration and the engine-side vibration that is connected to the engine mount is considered to be an effective means for suppressing the transmission of the engine vibration to the vehicle body. ing.

[0003]

Such a conventional hydraulic control type engine mount has no means for restricting the amount of movement of the movable member which is driven by an actuator and reciprocates, so that it is traveling on a rough road, for example. When excessive vibration is applied to the engine mount from the engine side, the movable member may be displaced beyond the allowable range, and the movable member may be damaged. Further, the movable member may come into contact with other members and damage not only the movable member but also the other members.

The present invention has been made in order to solve such problems, and an object thereof is to provide an engine mount excellent in vibration resistance as well as excellently blocking transmission of engine vibration to the vehicle body. To do.

[0005]

An engine mount according to claim 1 of the present invention for solving the above-mentioned problems is an engine mount which is arranged between a vehicle body and a power unit and which damps vibrations of the power unit. The partition between the main liquid chamber whose volume is changeable and the sub liquid chamber whose volume is changeable which is provided adjacent to this main liquid chamber in the axial direction, and the main liquid chamber in which an incompressible fluid is sealed and the above Inside the communication hole, a partition wall having a communication hole communicating with the sub-liquid chamber is provided in the central part, and a radial gap is formed between the partition wall and the inner peripheral wall of the partition wall which is fitted into the communication hole and forms the communication hole. By reciprocating in the axial direction to change the volume of the main liquid chamber to adjust the pressure in the main liquid chamber, a driving unit for reciprocating the movable member, and a control for controlling the driving unit. The device, and adjacent to the secondary liquid chamber An air diaphragm provided on the axially opposite side to the liquid chamber and the sub liquid chamber are liquid-tightly partitioned, and an elastic diaphragm that reciprocates together with the movable member, and a stopper that regulates the amount of reciprocal movement of the movable member in both directions. And are provided.

An engine mount according to a second aspect of the present invention is the engine mount according to the first aspect, from the reference position when the movable member is not driven to the stopper provided in both directions of reciprocating movement of the movable member. Each axial length is longer than each movement amount from the reference position in both directions of reciprocating movement of the movable member when driven by the driving unit.

An engine mount according to claim 3 of the present invention is the engine mount according to claim 1 or 2, wherein:
It is characterized in that the stopper locks the movable member at two or more points in the circumferential direction in at least one of both directions of the reciprocating movement of the movable member. The engine mount according to claim 4 of the present invention is the engine mount according to claim 1, 2 or 3.
In the engine mount described above, the stopper is provided with a buffer member at a contact position with the movable member, which buffers a shock at the time of collision with the movable member.

[0008]

According to the engine mount of the first aspect of the present invention, by providing a stopper for restricting the amount of movement of the movable member in both directions of reciprocating movement, even when excessive vibration is applied to the engine mount, Since the movable member is prevented from being damaged and the movable member and the other member are prevented from interfering with each other, it is possible to prevent the other member from being damaged.

According to the engine mount of the second aspect of the present invention, since the movable member is not locked by the stopper under the control of the driving means in a normal operating condition, the vibration of the engine can be properly damped in the normal operating condition. it can. According to the engine mount of the third aspect of the present invention, the stopper locks the movable member at two or more points in the circumferential direction, thereby suppressing axial displacement of the movable member even if the movable member is locked by the stopper. Therefore, the smooth reciprocating movement of the movable member can be maintained. Furthermore, since the communication between the main liquid chamber and the sub liquid chamber is maintained even when the stopper locks the movable member, the vibration of the engine can be well damped even when excessive vibration is applied to the engine mount. At the same time, it is possible to prevent the stopper from falling off.

According to the engine mount of the fourth aspect of the present invention, the noise at the time of collision is reduced by providing the stopper at the contact position with the movable member for cushioning the shock at the time of collision with the movable member. be able to.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a state in which the engine mount according to the embodiment of the present invention is mounted on a vehicle. Engine mount 30
Is a hydraulic control type electronically controlled engine mount, and is arranged between the stay 10a of the vehicle body 10 and the stay 20a of the engine 20 which is a power unit. An electronic control unit that controls the engine mount 30 (hereinafter referred to as "E
CU ”) 100 inputs a rotation angle signal Ne related to the rotation speed of the engine 20 from a rotation angle sensor 22 provided in a distributor 21 of the engine 20,
Similarly, by inputting the reference position signal G2 indicating the reference position of the crank angle from the reference position sensor 23 provided in the distributor 21, the engine mount 30
Control the operation of. The rotation angle sensor 22 and the reference position sensor 23 are a kind of magnet pickup.

As shown in FIG. 1, the engine mount 30
Is used with the lower end fastened to the vehicle body 10 side and the upper end fastened to the engine 20 side with bolts. The engine mount 30 includes a support portion 40 that is provided on the engine 20 side and supports the engine 20, a vibration damping portion 50 that damps the vibration of the engine 20, and an actuator portion 60 that is a driving unit that drives the vibration damping portion 50.

The support portion 40 comprises a frame 41, a mount rubber 42, a boss 43, a stopper 44, a stopper 45 and a stopper 46. The frame 41 is fixed on the opening edge 61 a of the outer yoke 61 of the actuator portion 60 by fastening a diaphragm 55, which is an elastic diaphragm formed in a disk shape of the vibration damping portion 50, and a partition plate 53 together with bolts 66. . An annular frame 41, a dome-shaped mount rubber 42, and a cylindrical boss 43 are disposed on the partition plate 53. The partition plate 53 is previously fixed to the opening edge 61a by a plurality of screws 67.

A stopper 44 fastened and fixed to the frame 41 by a bolt 47 is arranged on the boss 43. The stoppers 45 and 46 are arranged on the boss 43 in a circumferential direction determined by a positioning pin 48 and fastened together with the boss 43 by a bolt (not shown). A rubber cushioning member is baked on the contact surfaces of the stoppers 45 and 46 as stoppers. The stoppers 44, 45, and 46 operate so as to regulate the excessive displacement of the support portion 40.

The vibration damping section 50 is provided between the support section 40 and the actuator section 60. The main liquid chamber 51 and the sub liquid chamber 52 are arranged in this order in the axial direction immediately below the mount rubber 42, and are partitioned by a partition plate 53 which is a partition wall. The sub liquid chamber 52 and the air chamber 54 formed on the vehicle body 10 side of the sub liquid chamber 52 are liquid-tightly partitioned by a diaphragm 55. An incompressible fluid is sealed in the main liquid chamber 51 and the sub liquid chamber 52. Since the air chamber 54 is open to the atmosphere, the sub liquid chamber 52 is in equilibrium with the atmospheric pressure.

A circular communication hole 53a is formed in the center of the partition plate 53.
Is formed, and the main liquid chamber 51 and the sub liquid chamber 52 communicate with each other through the communication hole 53a. The movable member 56 is formed in a bottomed cylindrical shape that opens upward, and is disposed in a horizontal posture in the communication hole 53a. A flange 56a is formed on the upper edge of the movable member 56, and a gap S of about 0.1 to 0.3 mm is formed between the outer wall of the flange 56a and the inner wall of the partition plate 53 forming the communication hole 53a. There is. A mounting portion 56b is provided at the center of the lower surface of the movable member 56 so as to project. The diaphragm 55 is provided between the mounting portion 56b and the spool 74a of the yoke 74.
The central portions of the are clamped and are connected to each other by bolts 57.

The movable member 5 is provided at both axial ends of the partition plate 53.
Stoppers 81 and 84 capable of locking the collar 56a of No. 6 are press-fitted, respectively. The stopper 81 and the stopper 84 have the same structure except that the assembling directions are different. As shown in FIGS. 2 and 3, the stopper 81 includes a metal fitting 82 and a cushioning member 83. The metal fitting 82 is an annular support portion 82a.
And a pair of arcuate locking portions 82b which are formed integrally with the support portion 82a and are provided 180 degrees opposite to each other from the outer periphery of one end of the support portion 82a toward the center. An arcuate rubber cushion member 83 is vulcanized and adhered to the movable member 56 side of the locking portion 82b. The cushioning member 83 is for cushioning the impact when colliding with the movable member 56 and reducing noise. The stoppers 81 and 84 are the locking portions 82b and 84 facing each other.
The main liquid chamber 51 and the sub liquid chamber 52 are communicated with each other through the communication holes 81a and 84a provided between b. As shown in FIG. 1, the end surface positions of the buffer members 83, 86 on the movable member 56 side coincide with the axial end positions of the inner peripheral wall of the partition plate 53 forming the communication hole 53a. The movable member 56 reciprocates between the stopper 81 and the stopper 84 without coming into contact with the buffer members 83 and 86 even at the maximum displacement positions in both directions by the drive of the actuator unit 60. Further, the stoppers 81 and 84 are provided on the movable member 56.
When the amplitude of is increased, the movable member 56 is locked and the movable member 56 is prevented from falling off.

A lower yoke 71 is fixed to a bottom portion inside the outer yoke 61 by a plurality of screws 65 and a positioning pin 64, and a cylindrical portion 71a is integrally formed on an upper surface of the lower yoke 71. An annular ferrite magnet 72 is attached on the lower yoke 71 so as to surround the cylindrical portion 71a, and an annular upper yoke 73 is attached on the ferrite magnet 72. The inner peripheral wall of the upper yoke 73 faces the outer peripheral wall of the cylindrical portion 71 a of the lower yoke 71 with a predetermined gap. Upper yoke 73
The damper holder 62 is bonded on the upper side in a positioned state, and two dampers 63 made of non-woven fabric are stretched around the inner circumference of the damper holder 62 at a predetermined interval vertically and have a bottomed cylindrical shape with a bottom opening. It supports the yoke 74. York 7
Reference numeral 4 includes a spool 74a forming an upper surface and an aluminum foil bobbin 74b wound around the circumference of the spool 74a and adhered thereto. Both dampers 63 have a bellows-shaped cross section and restrict movement of the yoke 74 in a direction orthogonal to the axial direction.
The yoke 74 is allowed to move slightly in both directions of the shaft. The movable coil 75 is a cylindrical portion 71 of the lower yoke 71.
It is inserted between the outer peripheral wall of a and the inner peripheral wall of the upper yoke 73, and is wound around the lower outer periphery of the yoke 74. The movable coil 75 maintains a predetermined distance from both the lower yoke 71 and the upper yoke 73, which are magnetic materials.

The lower yoke 71, the ferrite magnet 72, the upper yoke 73, the yoke 74, and the movable coil 75 make up a so-called voice coil 70 as an actuator.
Is configured. Lower yoke 71, ferrite magnet 7
When an alternating current is supplied from the connector 80 to the movable coil 75 in the DC magnetic field formed by the upper coil 73 and the upper yoke 73, the movable coil 75 vibrates in the axial direction according to Fleming's left-hand rule, and the yoke 74 also moves.
Vibrates with.

Next, the operation of the engine mount 30 will be described. (1) When an AC voltage corresponding to engine vibration is applied from the ECU 100 to the movable coil 75 in a normal traveling state of the vehicle, the yoke 74 vibrates in the axial direction. This yoke 7
4 together with the movable member 56, the stopper 81 and the stopper 8
4 vibrates in the communication hole 53a in the axial direction within a range in which the stopper 81 and the stopper 84 do not come into contact with each other. Then, the volume of the main liquid chamber 51 changes due to the vibration of the movable member 56. The gap S between the outer peripheral wall of the movable member 56 and the inner peripheral wall of the partition plate 53 forming the communication hole 53a is minimized while avoiding contact between the two members when the movable member 56 vibrates. , The operating frequency of the voice coil 70 10
Within the range of 200 Hz, the main liquid chamber 51 passes through the gap S.
A pressure amplitude is generated in the main liquid chamber 51 due to the resistance of the incompressible liquid that slightly flows between the sub liquid chamber 52 and the sub liquid chamber 52, and this pressure amplitude changes so as to damp engine vibration. At this time, the incompressible liquid sealed in the main liquid chamber 51 and the sub liquid chamber 52 is slightly passed through the gap S between the main liquid chamber 51 and the sub liquid chamber 52 due to its viscous action even at a low frequency of about 10 Hz. Therefore, a sufficient pressure difference can be generated between the main liquid chamber 51 and the sub liquid chamber 52. Further, since the amplitude or phase of the hydraulic pressure in the main liquid chamber 51 can be arbitrarily controlled by changing the phase, voltage or frequency of the input voltage applied to the movable coil 75, the damping characteristic of the engine mount 30 can be easily changed. it can.

(2) For example, when the vehicle runs on a rough road, as shown in the upper part of FIG. 5, excessive vehicle body vibration is applied to the engine mount 30, so that the mount rubber 42 vibrates greatly and the main liquid chamber 51. When the internal pressure fluctuates beyond the allowable range, the movable member 56 reciprocates greatly and the stopper 81
Or it may be locked to 84. As shown in the lower part of FIG. 5, the displacement of the movable member 56 is flat in the vertical direction, which means that the movable member 56 is locked by the stoppers 81 and 84. Since the bow-shaped cushioning members 83 and 86 are provided at two positions opposite to each other by 180 °, the axial displacement of the movable member 56 can be suppressed even if the movable member 56 is locked by the stopper 81 or 84. Therefore, the smooth reciprocating movement of the movable member 56 can be maintained.
Further, even if the movable member 56 is locked by the stoppers 81 and 84, the communication between the main liquid chamber 51 and the sub liquid chamber 52 is maintained only by closing a part of the gap S in the circumferential direction. Therefore, even if the pressure in the main liquid chamber 51 rises while the movable member 56 is locked by the stopper 84, an excessive force is applied to the stopper 84 in the downward direction of FIG. Can be prevented. When the movable member 56 is locked by the stopper 81, the pressure in the sub liquid chamber 52 is substantially atmospheric pressure, and therefore the stopper 81 does not come out upward in FIG.

However, when the movable member 56 is locked by the stopper 81 or 84, a part of the gap S in the circumferential direction is closed by the cushioning member 83 or 86, and the flow passage area is reduced.
In this state, the mount rubber 42 vibrates greatly and the main liquid chamber 5
It is conceivable that when the volume of No. 1 largely changes, the negative pressure in the main liquid chamber 51 increases, and cavitation resulting from this causes the pressure waveform in the main liquid chamber 51 to be disturbed. Figure 5
As shown in the middle row, the pressure in the main liquid chamber 51 may be close to vacuum, and cavitation is thought to occur, but the maximum pressure in the main liquid chamber 51 is about 250 kPa and each member is damaged. It is not the height to make it.

In this embodiment, when excessive vibration is applied to the engine mount, the movable member 56 is locked by the stoppers 81 or 84 on both sides at two points.
Even if the movable member 56 is locked by the stopper 81 or 84, the axial displacement of the movable member 56 is suppressed and the main liquid chamber 51
Is configured to maintain communication between the sub liquid chamber 52 and the sub liquid chamber 52. Therefore, the smooth reciprocating movement of the movable member 56 can be maintained, and the stoppers 81 and 84 can be prevented from falling off because an excessive force is not applied to the stoppers 81 and 84.

Next, modification 1 and modification 2 of the stopper
Will be described. (Modification 1) FIGS. 6 and 7 show Modification 1 of the present embodiment. The stopper 91 can be used as a stopper on either side of the main liquid chamber or the sub liquid chamber, and includes a metal fitting 92 and a buffer member 93. The metal fitting 92 is an annular support portion 92a.
And a plate-shaped locking portion 92b which is integrally formed with the support portion 92a and extends toward the center at 90 ° intervals from the outer periphery of one end of the support portion 92a. A rubber cushioning member 93 is vulcanized and adhered to the movable member side of the tip of the engaging portion 92b, that is, the lower side of FIG. A communication hole 91a is provided on the inner circumference of the stopper 91 to connect the main liquid chamber and the sub liquid chamber.

In the first modification, since the movable member is locked by the four cushioning members 93 provided at equal intervals, it is possible to suppress the axial deviation of the movable member even better even if the movable member is locked by the stopper. You can (Modification 2) FIGS. 8 and 9 show a modification 2 of this embodiment.

The stopper 101 is a metal fitting 102 and a cushioning member 1.
It consists of 03. The metal fitting 102 is an annular support portion 102.
a and the supporting portion 102a are integrally formed,
A plate-like locking portion 102b is supported on the outer periphery of one end of a through the center of the stopper 101 and both ends thereof are supported by the support portion 102a. A rubber cushioning member 103 is vulcanized and adhered to the movable member side of the engaging portion 102b, that is, the lower side of FIG. 8, and the movable member is engaged with the cushioning member 103 at both ends in the diameter direction of the stopper 101. A communication hole 101a surrounded by the support portion 102a and the locking portion 102b communicates the main liquid chamber and the sub liquid chamber. Since the stopper 101 passes through the center of the stopper 101, it cannot be used as a stopper on the side of the auxiliary liquid chamber.

In the second modified example, since the buffer member 103 is baked on the locking portion 102a over a substantially diameter, the buffer member 103 has a high baking strength, so that the buffer member 103 is formed.
Is hard to peel off from the metal fitting 102. Although the movable member is locked to the stopper at two or four points in the above-described embodiment of the present invention and its modification, the movable member is locked to the stopper at one or a plurality of points in the present invention. However, if the main liquid chamber and the sub liquid chamber can be communicated with each other, the contact area when the movable member and the stopper are locked can be arbitrarily set. Further, according to the present invention, the movable member may be engaged with the stopper over the entire circumference in at least one of the stoppers to shut off the main liquid chamber and the sub liquid chamber.
However, when the main liquid chamber and the sub liquid chamber are shut off when the movable member is locked by the stopper on the side of the sub liquid chamber, high pressure in the main liquid chamber may be applied to the stopper and the stopper may fall off.
It is desirable that the stopper on the side of the sub liquid chamber locks the movable member at two or more points so that the main liquid chamber and the sub liquid chamber are in communication with each other.

Further, in the present invention, the stoppers of the embodiment, the modified example 1 and the modified example 2 can be appropriately combined and used. In the present invention, it is also possible to use resin for the buffer member. Further, in the present invention, it is also possible to lock the movable member with a stopper provided only with the metal fitting without providing the buffer member.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an engine mount of the present invention.

FIG. 2 is a cross-sectional view showing a stopper of this embodiment.

FIG. 3 is a view on arrow III in FIG.

FIG. 4 is a schematic diagram showing a state in which the engine mount of the present embodiment is mounted on a vehicle.

FIG. 5 is a characteristic diagram showing the main liquid chamber pressure and the displacement of the movable member when an excessive mount input is applied to the engine mount of this embodiment.

FIG. 6 is a cross-sectional view showing a modified example 1 of the stopper of the present embodiment.

FIG. 7 is a view taken in the direction of the arrow VII in FIG. 6;

FIG. 8 is a cross-sectional view showing a modified example 2 of the stopper of the present embodiment.

9 is a view taken in the direction of arrow IX in FIG.

[Explanation of symbols]

 10 vehicle body 20 engine (power unit) 30 engine mount 51 main liquid chamber 52 sub liquid chamber 53 partition plate (partition wall) 53a communication hole 54 air chamber 55 diaphragm (elastic diaphragm) 56 movable member 60 actuator part (driving means) 71 lower yoke (drive) Means) 72 Ferrite magnet (driving means) 73 Upper yoke (driving means) 75 Moving coil (driving means) 81, 84 Stoppers 83, 86 Buffer member

Claims (4)

[Claims] 1. An engine mount disposed between a vehicle body and a power unit for damping vibration of the power unit, the main liquid chamber having a variable volume and an axially adjacent main liquid chamber. A partition wall that partitions the space between the auxiliary liquid chamber whose volume can be changed and connects the main liquid chamber in which an incompressible fluid is sealed and the auxiliary liquid chamber, and a partition wall provided at the center, and is fitted into the communication hole. The main liquid chamber by changing the volume of the main liquid chamber by axially reciprocating in the communication hole by forming a gap in the radial direction with the inner peripheral wall of the partition wall forming the communication hole. A movable member that adjusts the pressure of the movable member, a driving unit that reciprocates the movable member, a control device that controls the driving unit, and an axially opposite side of the main liquid chamber that is adjacent to the sub liquid chamber. The air chamber and the auxiliary liquid chamber are liquid-tightly partitioned, and the movable part is Engine mount, characterized in that it comprises an elastic diaphragm that reciprocates, a stopper for restricting the amount of movement in reciprocating directions of said movable member, along with. 2. The length in each axial direction from the reference position when the movable member is not driven to the stoppers provided in both directions of reciprocating movement of the movable member is the axial length from the reference position when driven by the driving means. The engine mount according to claim 1, wherein the movable member is longer than the reciprocating movements in both directions. 3. The stopper according to claim 1, wherein the stopper locks the movable member at two or more points in a circumferential direction in at least one of both directions of the reciprocating movement of the movable member. Engine mount. 4. The engine mount according to claim 1, 2 or 3, wherein the stopper is provided with a buffer member at a contact position with the movable member, the buffer member cushioning a shock when the movable member collides with the movable member.