JPH08200433A - Engine mount - Google Patents

Abstract

PURPOSE: To provide an engine mount excellent in vibration resistance while transmitting engine vibration to a car body is well efficiently reduced. CONSTITUTION: A movable part of a voice coil comprises a spool 75, bobbin 78 and a movable coil wound to the downward of the bobbin 78, and the spool 75 is connected by a bolt to a movable member of changing the volume of a main liquid chamber. When AC voltage in accordance with engine vibration is applied to the movable coil arranged in a magnetic field, the movable member is moved to reciprocate with the movable part to change a pressure in the main liquid chamber, so as to reduce the engine vibration. An annular groove 75b is formed downward a stop part 76 of the spool 75. Since an end part of the bobbin 78 is fixed to be partially calked in the peripheral direction toward this groove 75b, even when excessive vibration is inputted to a mount main unit to move the movable member largely reciprocating in a permissible range or more to collide against a stopper, disconnecting the spool 75 from the bobbin 78 is prevented.

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 to reduce 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 below the engine support portion of the engine mount, and the movable member is vibrated by an actuator to change the volume of the main liquid chamber. The periodic hydraulic vibration is generated in. 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 a spool which is coupled to a movable member and reciprocates together with the movable member, a bobbin coupled to the spool, and a bobbin wound around the bobbin. A voice coil having a movable coil that reciprocates together as a movable portion may be used as an actuator of a movable member. When the spool and the bobbin are joined only by an adhesive, the weight ratio of the moving coil in the moving portion of the voice coil is large. Therefore, by energizing the moving coil disposed in the magnetic field, the voice coil is moved together with the moving member. When the movable part of the movable coil reciprocates, the coupling between the bobbin around which the movable coil is wound and the spool by the adhesive may be released due to the inertial force.

Further, a stopper for restricting the reciprocating movement of the movable member in both directions is provided, and even if excessive vibration is input to the engine mount, the movable member is locked by the stopper so that the movable member may fall off or fall. There is known an engine mount that prevents other members from being damaged, but the impact between the movable member and the stopper makes it easier to release the coupling between the spool and the bobbin. When the coupling between the spool and the bobbin is released, the driving force of the voice coil cannot be efficiently transmitted to the movable member, so that there is a problem that the vibration reducing performance of the engine mount is deteriorated.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide an engine mount having excellent vibration resistance as well as effectively and efficiently reducing the transmission of engine vibration to the vehicle body. To aim.

[0006]

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 an engine and which reduces vibration of the engine. A partition between a main liquid chamber whose volume changes due to vibrations from the vehicle body or the engine and a sub liquid chamber that is axially adjacent to the main liquid chamber and has a variable volume, and is filled with an incompressible fluid. A partition wall having a communication hole for communicating the main liquid chamber and the auxiliary liquid chamber, which is formed in the central portion, and a radial gap with an inner peripheral wall of the partition wall which is fitted into the communication hole and forms the communication hole. And a movable member that adjusts the pressure in the main liquid chamber by changing the volume of the main liquid chamber by axially reciprocating in the communication hole, and together with the movable member that is coupled to the movable member. Reciprocating spool, the spool And a movable coil which is provided on the opposite side of the movable member in the axial direction and is caulked and coupled to the spool to reciprocate together with the spool, and a movable coil wound around the bobbin and reciprocally movable together with the bobbin as a movable part, A magnet that forms a magnetic field around the movable coil is used as a fixed portion, and a voice coil that reciprocates the movable member by energizing the movable coil disposed in the magnetic field, and energization to the voice coil are controlled. And a control device.

An engine mount according to a second aspect of the present invention is the engine mount according to the first aspect, characterized in that the bobbin is caulked toward a groove formed in a circumferential direction on an outer peripheral wall of the spool. To do. Claim 3 of the present invention
The engine mount according to claim 2 is the engine mount according to claim 2, wherein the bobbin is partially caulked toward the groove, and an axial end portion of the non-caulked portion on the movable member side is formed on the spool. It is characterized in that it abuts on the locked portion.

An engine mount according to a fourth aspect of the present invention is the engine mount according to the first, second or third aspect, further comprising a stopper for restricting a reciprocating movement amount of the movable member in both directions. .

[0009]

According to the engine mount of the first aspect of the present invention, the spool and the bobbin are caulked and coupled at the movable portion of the voice coil that reciprocates the movable member and reciprocates together with the movable member. As a result, even if the movable portion of the voice coil reciprocates together with the movable member, the bobbin is locked by the spool, so that the coupling between the spool and the bobbin can be prevented from being released by inertial force. As a result, the driving force of the voice coil is efficiently transmitted to the movable member, so that the accuracy of the vibration reducing characteristic of the engine mount is improved.

According to the engine mount of the second aspect of the present invention, the bobbin is locked in the groove by caulking the bobbin toward the groove formed in the outer peripheral wall of the spool in the circumferential direction. The spool and bobbin join together.
According to the engine mount of claim 3 of the present invention, the bobbin is partially caulked toward the groove formed in the spool,
The axial end on the movable member side of the non-crimped portion abuts on the locking portion formed on the spool, so that the displacement between the spool and the bobbin can be better prevented when the voice coil is moved to the movable member side. it can.

According to the engine mount of the fourth aspect of the present invention, the movable member is prevented from being damaged even when excessive vibration is applied to the engine mount by providing the stopper for restricting the reciprocating movement amount of the movable member in both directions. In addition to the prevention, the movable member and the other member are prevented from interfering with each other, so that the other member can be prevented from being damaged.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 4 shows a state in which an engine mount according to a first embodiment of the present invention is mounted on a vehicle. The engine mount includes a mount body 30 and an electronic control unit (hereinafter,
(Hereinafter referred to as "ECU") 100, which is a hydraulic control type electronically controlled engine mount. The mount body 30 is arranged between the stay 10a of the vehicle body 10 and the stay 20a of the engine 20, and is used with its lower end fastened to the vehicle body 10 side and its upper end fastened to the engine 20 side with bolts. The ECU 100 detects the engine 2 from the rotation angle sensor 22 provided in the distributor 21 of the engine 20.
By inputting the rotation angle signal Ne related to the rotation speed of 0 and the reference position signal G2 indicating the reference position of the crank angle from the reference position sensor 23 also provided in the distributor 21, the operation of the mount main body 30 is performed. To control. Rotation angle sensor 22 and reference position sensor 23
Is a kind of magnet pickup.

As shown in FIG. 3, the mount body 30 is
A support portion 40 provided on the engine 20 side for supporting the engine 20, and a vibration damping portion 5 for damping the vibration of the engine 20.
0, an actuator section 60 which is a driving means for driving the vibration damping section 50. The support portion 40 includes a frame 41,
It comprises a mount rubber 42, a boss 43, a stopper 44, a stopper 45 and a stopper 46. The frame 41 has an opening edge 61 a of the outer yoke 61 of the actuator section 60.
A diaphragm 55, which is a disk-shaped elastic diaphragm of the vibration damping portion 50, and a partition plate 53 are fixed together by 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. The main liquid chamber 51 and the sub liquid chamber 52 are filled with ethylene glycol (LLC) which is a non-compressible fluid. 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 central portion of the diaphragm 55 is sandwiched between the mounting portion 56b and the spool 75 of the yoke 74, and they are coupled 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. Movable member 5
An arcuate rubber cushioning member is vulcanized and adhered to the portions of the stoppers 81 and 84 that come into contact with the collar 56a of No. 6. The cushioning member is for cushioning the impact of colliding with the movable member 56 and reducing noise. The position of the end surface of the buffer member, which is adhered to the stoppers 81 and 84, on the movable member 56 side coincides with the axial end positions of the inner peripheral wall of the partition plate 53 that forms the communication hole 53a. Actuator part 6
When driven by 0, the movable member 56 reciprocates between the stopper 81 and the stopper 84 without contacting the buffer member even at the maximum displacement positions in both reciprocating directions.
When the input vibration from the vehicle body 10 and the engine 20 to the mount body 30 increases and the amplitude of the mount rubber 42 increases, the displacement of the movable member 56 increases, so that the main liquid chamber 51 increases.
The pressure fluctuation of becomes large. At this time, the stopper 81 or 84 locks the movable member 56 and prevents the movable member 56 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. Both dampers 63 have a bellows-shaped cross section, and restrict movement of the yoke 74 in a direction orthogonal to the axial direction, while the yoke 7 is bidirectional in the axial direction.
4 is allowed to move slightly.

The yoke 74 is a spool 75 forming an upper surface.
And an aluminum foil bobbin 78 wound around the circumference of the bobbin 78 and joined. The movable coil 79 includes an outer peripheral wall of the cylindrical portion 71 a of the lower yoke 71 and the upper yoke 7.
It is inserted between the inner peripheral wall of the bobbin 3 and the bobbin 78 and is wound around the lower outer periphery of the bobbin 78. The movable coil 79 maintains a predetermined distance from both the lower yoke 71 and the upper yoke 73, which are magnetic materials. As shown in FIG. 1, the spool 7
A female screw portion 75 a that is coupled to the male screw portion of the bolt 57 is formed in the center of the bolt 5. An annular locking portion 76 that extends radially outward is formed on the outer periphery of the spool 75, and an annular skirt portion 77 that extends in the axial direction is integrally formed below the locking portion 76. An annular groove 75b is formed at the boundary between the engaging portion 76 and the skirt portion 77, and the end portion of the bobbin 78 faces the groove 75b at two to four places in the circumferential direction, and three at the entire circumference.
It is fixed by caulking about / 4. The contact surface between the skirt portion 77 and the bobbin 78 is further joined with an adhesive. The axial end portion of the bobbin 78 on the movable member 56 side that is not crimped is in contact with the end surface 76a of the locking portion 76 that forms a part of the groove 75b. The bobbin 78 shown in FIG. 2 has a plate thickness t of about 0.1 mm, and the groove 75b is formed to have a depth of 2 t or more.

As shown in FIG. 3, the lower yoke 71, the ferrite magnet 72, the upper yoke 73, the yoke 74, and the movable coil 79 constitute a so-called voice coil 70 as an actuator. Lower York 7
1, the ferrite magnet 72 and the upper yoke 73 form a fixed portion of the voice coil 70, and the yoke 74 and the movable coil 79 form a movable portion of the voice coil 70. When an alternating current is supplied from the connector 80 to the movable coil 79 in the DC magnetic field formed by the lower yoke 71, the ferrite magnet 72, and the upper yoke 73, the movable coil 79 vibrates in the axial direction according to Fleming's left-hand rule, and the yoke 74 also moves. It vibrates together with the coil 79.

Next, the operation of the engine mount will be described. (1) When an AC voltage corresponding to engine vibration is applied from the ECU 100 to the movable coil 79 in a normal vehicle traveling state, 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 79, the damping characteristic of the mount body 30 can be easily changed. it can.

(2) For example, when the ECU 100 stops controlling the mount body 30, or when the vehicle travels on a bad road and excessive vibration is input to the mount body 30, the mount input amplitude, the main liquid chamber pressure, and the movable body pressure An example of the member displacement amount is shown in FIGS. 5 and 6. 5 is a characteristic diagram showing a case where the mount input amplitude is ± 2 mm, and FIG. 6 is a mount input amplitude of ± 5 mm.
It is a characteristic view showing the case of. 5 and 6,
The horizontal axis is the time axis, one scale represents 20 ms, and the vibration frequency input to the mount body is 11 Hz. The displacement amount of the movable member indicates the displacement amount to the stopper 84 located below the movable member 56 in the upper direction of FIGS. 5 and 6, and is the upside down from the actual displacement direction of the movable member 56. There is. When excessive vibration is applied to the mount body 30, the mount rubber 42 vibrates greatly and the volume of the main liquid chamber 51 changes greatly. Since the volume fluctuation of the main liquid chamber 51 substantially corresponds to the product of the cross-sectional area of the communication hole 53a and the displacement of the movable member 56, the movable member 56 reciprocates more than the permissible range and is locked by the stopper 81 or 84. It may be done. In FIG. 5 and FIG. 6, the movable member 56 collides with the stopper 81 or 84 at the position where the slope of the curve of the displacement amount of the movable member changes abruptly. When the engine side amplitude is ± 2 mm, the movable member 56 collides only with the lower stopper 84, and when the engine side amplitude is ± 5 mm, the movable member 56 collides with both stoppers 81 and 84. The inclination of the displacement amount of the movable member at the time of collision represents the speed at which the movable member 56 collides with the stopper 81 or 84. As can be seen from FIG. 6, the speed at which the movable member 56 collides with the stopper 84 is more movable. It is faster than the speed at which the member 56 collides with the stopper 81. This is because the pressure of the main liquid chamber 51 acts on the movable member 56 in the direction of the stopper 84. The speed at which the movable member 56 collides with the stopper 84 is 0.6 m / m in FIG.
s, 2 m / s in FIG.

Since the end of the bobbin 78 is only partially caulked, the end of the bobbin 78 that is not caulked is locked to the end surface 76a of the locking portion 76. When the movable member 56 collides with the stopper 81, the inertial force of the bobbin 78 acts in the direction in which the bobbin 78 is locked by the locking portion 76, so that the coupling between the spool 75 and the bobbin 78 is not released. However, when the movable member 56 collides with the stopper 84, the inertial force of the bobbin 78 acts in the direction in which the bobbin 78 separates from the spool 75. Therefore, for example, when the spool and the bobbin are joined together with an adhesive, The connection between the and bobbin may be released. However, in the first embodiment, since the end of the bobbin 78 is partially swaged toward the groove 75b of the spool 75, even if the inertial force acts in the direction in which the bobbin 78 moves away from the spool 75, the bobbin 78 is swaged. Since a certain end portion is locked in the groove 75b, the coupling between the spool 75 and the bobbin 78 is prevented from being released. Compared with the case where the spool and the bobbin are joined only by the adhesive, the joining strength between the spool 75 and the bobbin 78 is improved by about four times by caulking the end of the bobbin 78 partially toward the groove 75b.

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. It Therefore, even if the pressure in the main liquid chamber 51 rises while the movable member 56 is locked by the stopper 84, the stopper 8
4, it is possible to prevent an excessive force from being applied to the lower part of FIG. 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.

(Second Embodiment) A second embodiment of the present invention is shown in FIG.
Shown in An annular groove 90a is formed on the outer peripheral wall of the skirt portion 92 which is located below the engaging portion 91 of the spool 90 which engages the end portion of the bobbin 91. The end portion of the bobbin 93 abuts on the end surface 91a of the locking portion 91, and the side wall of the bobbin 93 at a position corresponding to the groove 90a is partially caulked inward toward the groove 90a by about 3/4 of the entire circumference. . Skirt part 9
The contact surface between 2 and the bobbin 93 is further joined with an adhesive.

In the second embodiment, the groove 90a has the skirt portion 9
Since it is formed on the outer peripheral wall of No. 2, the length of the skirt portion 92 becomes longer than that of the first embodiment. For this reason, the weight of the spool 90 is heavier than that of the first embodiment, but the caulked portion of the bobbin 93 is locked in the vertical direction of the groove 90a, so that the joining strength between the spool and the bobbin is greater than that of the first embodiment. Also improves.

In the embodiment of the present invention described above, in addition to joining the spool and the bobbin with an adhesive, the bobbin is partially caulked toward the groove formed in the spool to join the spool and the bobbin. However, in the present invention, it is also possible to connect the spool and the bobbin by caulking the bobbin in the groove formed in the spool without using an adhesive. Further, in the present invention, the bobbin may be crimped over the entire circumference toward the groove of the spool, and the axial end of the bobbin on the movable member side may be brought into contact with the engagement portion of the spool over the entire circumference.

[Brief description of drawings]

1A and 1B are views showing a coupling between a spool and a bobbin of an engine mount according to a first embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a sectional view taken along line BB of FIG. Is.

FIG. 2 is an enlarged view of a II line portion in FIG. 1 (B).

FIG. 3 is a sectional view showing an engine mount according to a first embodiment of the present invention.

FIG. 4 is a schematic view showing a state in which the engine mount of the first 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 a mount input is applied to the engine mount of the present embodiment.

FIG. 6 is a characteristic diagram showing the pressure of the main liquid chamber and the displacement of the movable member when a mount input is applied to the engine mount of the present embodiment.

FIG. 7 is a sectional view showing a coupling between a spool and a bobbin of an engine mount according to a second embodiment of the present invention.

[Explanation of symbols]

 10 vehicle body 20 engine 30 mount body (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 71 lower yoke (voice coil) 72 ferrite magnet ( Voice coil) 73 upper yoke (voice coil) 74 yoke (voice coil) 75 spool (voice coil) 75b groove 76 locking portion 77 skirt portion 78 bobbin (voice coil) 79 movable coil (voice coil) 81, 84 stopper 90 spool 90a Groove 91 Locking portion 92 Skirt portion 93 Bobbin 100 ECU (control device)

Claims (4)

[Claims] 1. An engine mount disposed between a vehicle body and an engine for reducing vibration of the engine, comprising: a main liquid chamber whose volume is changed by vibration from the vehicle body or the engine; A communication hole is provided in the central portion for partitioning the space between the auxiliary liquid chamber and the auxiliary liquid chamber, which are provided adjacent to each other in the axial direction, and which communicates the main liquid chamber in which an incompressible fluid is sealed and the auxiliary liquid chamber. A partition wall and a volume of the main liquid chamber that is fitted in the communication hole, forms a gap in the radial direction with the inner peripheral wall of the partition wall that forms the communication hole, and reciprocates in the communication hole in the axial direction. To adjust the pressure in the main liquid chamber, a spool that is coupled to the movable member and reciprocates together with the movable member, and a spool that is provided on the opposite side of the spool in the axial direction from the spool. Crimp and combine And a bobbin that reciprocates together with the spool, and a movable coil that is wound around the bobbin and reciprocates together with the bobbin as a movable part, and a magnet that forms a magnetic field around the movable coil as a fixed part, which is disposed in the magnetic field. An engine mount, comprising: a voice coil that reciprocates the movable member by energizing the movable coil; and a control device that controls energization of the voice coil. 2. The engine mount according to claim 1, wherein the bobbin is caulked toward a groove formed in a circumferential direction on an outer peripheral wall of the spool. 3. The bobbin is partially crimped toward the groove, and an axial end portion of the non-crimped portion on the movable member side abuts on a locking portion formed on the spool. The engine mount according to claim 2, which is characterized in that. 4. The engine mount according to claim 1, further comprising a stopper that regulates the amount of movement of the movable member in both directions of reciprocating movement.