JPH1151109A - Liquid sealing type mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent delay in the attenuation operation of low frequency vibration without moving and elastically deforming a subdiaphragm when its operation is unnecessary by setting a first valve close condition, a second valve close condition, and a valve open condition for opening and closing a second orifice and changing over opening and closing by a control member. SOLUTION: A control member 20 moves vertically at a predetermined stroke to change over opening and closing of a second orifice 13. In a first valve close condition, a valve element part 18 is closed and the control member 20 is in contact with a lower face of a subdiaphragm 17 on the whole face thereof. In a second valve close condition, the valve element 18 is closed and the control member 20 leaves downward so that the resonance operation of the subdiaphragm 17 become possible. When the control member 20 moves further downward, the valve element part 18 leaves a partition part 9 to open a valve. In the first valve close condition, high attenuation is obtained in a vibration region of large amplitude of a low frequency, and the subdiaphragm 17 provided to absorb high frequency vibration does not move and is not elastically deformed at all when its operation is unnecessary so as to prevent delay in the attenuation operation for low frequency vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled mount used as an engine mount of a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, as disclosed in JP-A-59-117930 or JP-A-4-151041, a liquid-filled mount having a control function for switching communication between a plurality of orifices is known. The liquid-filled mount is provided with a sub-diaphragm that absorbs high-frequency vibration during high-speed running of an automobile as one of its functions. In the liquid-filled mount described in the former publication, a movable partition plate corresponds to the sub-diaphragm, and a predetermined space is provided in a space provided in the partition portion so that the movable partition plate resonates with high-frequency vibration. It is inserted up and down freely with a stroke. In the liquid-filled mount described in the latter publication, the movable plate corresponds to a sub-diaphragm, and the movable plate also has a predetermined stroke in a space provided in the partition so as to resonate with high-frequency vibration. And is vertically interpolated.

However, in this liquid-filled mount, even when the sub-diaphragm installed to absorb high-frequency vibration or low-frequency vibration that does not require elastic deformation is input, the sub-diaphragm moves by being pressed by the hydraulic pressure. Or it may be elastically deformed. Therefore, when the sub-diaphragm moves or elastically deforms due to the pressure of the liquid when the low-frequency vibration is input, the flow of the hydraulic fluid to the orifice installed to absorb the low-frequency vibration is delayed by this amount. There is a disadvantage that the damping operation for the frequency vibration is delayed.

[0004]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a liquid-filled mount having a control function for switching the communication between a plurality of orifices, and a sub-diaphragm installed to absorb high-frequency vibrations operates. An object of the present invention is to provide a liquid-filled mount that does not move or elastically deform when not needed, and that can prevent a delay in damping operation for low-frequency vibration.

[0005]

In order to achieve the above object, a liquid-filled mount of the present invention connects one mounting portion and the other mounting portion via an elastic body made of a rubber-like elastic material. An airtight space is provided by connecting a diaphragm to the other mounting portion, the airtight space is partitioned into a plurality of liquid chambers by a partition portion, and the plurality of liquid chambers have a first orifice and a flow resistance smaller than the first orifice. A liquid-filled mount provided with a valve for switching the opening and closing of the second orifice in the diaphragm, wherein the valve includes a holding member attached to the diaphragm; and A sub-diaphragm attached to the holding member so as to face the two orifices; a valve element provided on the outer periphery of the sub-diaphragm; the holding member; A spring member that elastically urges the aphram and the valve body toward the valve closing direction; and a spring member that comes into contact with and separates from the sub-diaphragm and moves the holding member, the sub-diaphragm and the valve body in the valve-opening direction. A control member to be actuated, and a drive source for operating the control member, with respect to opening and closing of the second orifice, a first valve closed state in which the control member is in contact with the sub-diaphragm, and the control member is A second valve closed state apart from the sub-diaphragm and a valve open state are set.

[0006] The liquid-filled mount of the present invention having the above configuration operates as follows.

[0007] General driving mode (first valve closed state)
The valve section is pressed by the elasticity of the spring member to close the second orifice, and the plurality of liquid chambers communicate with each other only through the first orifice. In the valve section, the control member is in contact with the sub-diaphragm.

[0008] Accordingly, in this state, when shake vibrations or the like of the engine having a relatively low frequency and a large amplitude are input to the mount, the hydraulic fluid flows through the first orifice. High attenuation is realized by the orifice. In addition, since the control member is in contact with and supports the sub-diaphragm, even if the hydraulic pressure presses the sub-diaphragm, the sub-diaphragm does not move or elastically deform, and the hydraulic fluid immediately flows to the first orifice. Start flowing.

High-speed running mode (second valve closed state)
The valve portion is pressed by the elasticity of the spring member to close the second orifice, and the plurality of liquid chambers communicate with each other only through the first orifice, but the control member is separated from the sub-diaphragm.

[0010] Therefore, in this state, when a relatively high frequency vibration with a small amplitude is input to the mount due to high speed running,
Since the sub-diaphragm operates in resonance, low dynamic spring during high-speed running is realized.

Idle mode (valve open state): the valve section opens the second orifice against the elasticity of the spring member by the operation of the drive source and the control member, and the plurality of liquid chambers The two orifices communicate through both.

[0012] Therefore, in this state, when a relatively high-frequency, small-amplitude vibration accompanying the idling of the engine is input to the mount, the hydraulic fluid flows through the second orifice having a relatively small flow resistance. Low dynamic spring during idling is realized.

The switching between the modes is preferably performed by driving a drive source by receiving a signal at the time of a gear change and thereby operating a control member.
The drive source and the control member are automatically operated so as to be in the normal traveling mode at the second and third speeds, the high speed traveling mode at the third and fourth speeds, and the idle mode at the neutral speed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a half section of a liquid-filled mount according to the embodiment.

As shown in FIG. 1, one mounting portion 1 provided with a boss sleeve 2 and the other mounting portion 3 provided with an annular case 4 and a cup-shaped bracket 5 have a rubber-like elasticity having an annular shape. The elastic member (also referred to as a rubber leg) 6 is connected via a material, and a diaphragm (also referred to as a first diaphragm) made of a rubber-like elastic material is provided inside the other mounting portion 3 (the inner peripheral side of the case 4). ) 7 are connected with their outer peripheral edges, surrounded by them, an airtight space 8 is provided inside the mount, and this airtight space 8 is provided with the diaphragm 7 inside the other mounting portion 3 together with the diaphragm 7. 9 (also referred to as an orifice plate).
A first liquid chamber (also referred to as a main liquid chamber) 10 on the side (upper side) and a second liquid chamber (also referred to as a sub liquid chamber) 11 on the diaphragm 7 side (lower side) 11 are formed. Orifices (also referred to as shock orifices) 12 are provided in the case 4 and the partition 9 to communicate with each other. Similarly, second orifices (also referred to as idle orifices) 13 for communicating the chambers 10 and 11 with each other are provided in the partition 9. A working liquid (also referred to as a sealing liquid) 14 such as a viscous fluid is sealed in both chambers 10 and 11.

The elastic body 6 made of a rubber-like elastic material is vulcanized and bonded to the boss sleeve 2 and the case 4 at the time of molding. The case 4 includes a partition 9 and a diaphragm 7.
At the same time, the outer peripheral edges are fixed to the bracket 5 by caulking.

The first orifice 12 is provided inside the case 4 as a planar arc-shaped flow path. The first orifice 12 is formed through a notch-shaped opening 12 a provided on the inner surface (inner peripheral surface) of the case 4. It communicates with the liquid chamber 10 and also communicates with the second liquid chamber 11 through a hole-shaped opening 12 b provided in the partition 9. In the drawing, the openings 12a and 12b are provided without being displaced on the circumference of each other, but are generally provided displaced on the circumference of each other in order to secure a long flow path length. The second orifice 13 is provided as a hole at the center of the plane of the partition portion 9 and has a larger opening cross-sectional area, a shorter flow path length, and a lower flow resistance than the first orifice 12. Is set.

A valve portion 15 for switching the opening and closing of the second orifice 13 is provided at the center of the plane of the diaphragm 7, and is configured as follows.

First, a ring-shaped holding member 16 made of a rigid material such as a sheet metal is vulcanized and adhered to the center of the plane of the diaphragm 7, and a rubber-like elastic member having a thin film shape is formed on the upper inner periphery of the holding member 16. A sub-diaphragm (also referred to as a second diaphragm) 17 made of a material is provided so as to face the second orifice 13, and on the outer periphery of the upper surface of the sub-diaphragm 17 and on the lower surface of the partition 9 at the outer periphery of the second orifice 13. An annular bead-shaped rubber-like elastic material valve body portion 18 having an annular shape that is in close contact with and detachable from the outside is provided, and an outward flange-like engagement portion 16a provided at an upper end portion of the holding member 16 and a bracket 5 therebelow. And a coil-shaped spring member (spring or coil) that elastically urges the holding member 16, the sub-diaphragm 17, and the valve body 18 in the valve closing direction (upward). Also referred to as pulling) 19 is interposed. Although the diaphragm 7, the sub-diaphragm 17 and the valve body 18 are integrally formed of a predetermined rubber material, they may be separately formed of the same or different rubber materials.

On the lower side of the sub-diaphragm 17, the holding member 16, the sub-diaphragm 17 and the valve element 18 are brought into contact with the sub-diaphragm 17 so as to be able to freely contact and separate from the sub-diaphragm 17. ) Is provided.

That is, the control member 20 has a disk-shaped contact surface portion 20b concentrically provided at the upper end of a shaft portion 20a slidably inserted through a through hole 5a provided in the bracket 5. The lower end of the shaft portion 20a is connected to an actuator 21 which is a driving source attached to the lower side of the outside of the bracket 5, and the actuator 2
When 1 operates, the control member 20 moves up and down with a predetermined stroke in accordance with this.

FIG. 1 shows a closed state in which the valve body 18 is pressed against the lower surface of the partition 9 by the elasticity of the spring member 19, and the control member 20 is at the upper end of the stroke and its contact surface 20b Indicates a “first valve closed state” in which the entire lower surface of the sub-diaphragm 17 is in contact.

When the actuator 21 is driven to move the control member 20 downward from the state shown in FIG. 1, the contact surface portion 20b of the control member 20 remains in the closed state as shown in FIG. When the control member 20 further moves downward from the state shown in FIG. 3, the contact surface portion 20b of the control member 20 is moved to the outer peripheral edge as shown in FIG. The retaining member 16, the sub-diaphragm 17 and the valve body 18 are engaged with the inward flange-shaped engaging portion 16 b provided at the lower end of the retaining member 16, against the elasticity of the spring member 19. The valve body 18 is moved away from the lower surface of the partition 9 so as to be in the “opened state”.

Therefore, the mount has three modes of “first closed state”, “second closed state” and “opened state” with respect to opening / closing of the second orifice 13 or operation of the valve portion 15. This operates in order corresponding to the “general driving mode”, the “high-speed driving mode”, and the “idle mode”.

The liquid-filled mount having the above configuration is
For example, one of the mounting portions 1 is connected to the engine side of the vehicle and the other mounting portion 3 is connected to the vehicle body side to support the engine in a vibration-proof manner.

General driving mode (first valve closed state)
As shown in FIG. 1, the valve body 18 is pressed by the elasticity of the spring member 19 and is in close contact with the lower surface of the partition 9, and the valve 15 closes the second orifice 13. The second liquid chambers 10 and 11 communicate with each other only through the first orifice 12. In the valve section 15, the contact surface 20 b of the control member 20 is in full contact with the lower surface of the sub-diaphragm 17.

Accordingly, in this state, when shake vibration of the engine having a relatively low frequency and large amplitude is input to the mount, the hydraulic fluid 14 is transferred from the first fluid chamber 10 to the second fluid chamber 11 via the first orifice 12. Or, conversely, the second liquid chamber 11
The first orifice 12 having a relatively large flow resistance for flowing from the first liquid chamber 10 to the first liquid chamber 10 realizes high attenuation in the target frequency region as shown in the graph of FIG.
Further, since the contact surface portion 20b of the control member 20 is in full contact with the lower surface of the sub-diaphragm 17 and supports the sub-diaphragm 17 from below, the hydraulic fluid 14 is transferred from the first liquid chamber 10 to the second liquid chamber 11. When the fluid flows, even if the hydraulic pressure presses the sub-diaphragm 17 from above, the sub-diaphragm 17 does not move or elastically deform at all.
4 immediately begins to flow into the first orifice 12.

Accordingly, a high damping can be obtained, and the sub-diaphragm 17 installed for absorbing high-frequency vibrations does not move or elastically deform at all when its operation is unnecessary, and thus the damping operation for low-frequency vibrations such as shake vibrations is achieved. Can be prevented from being delayed.

High-speed running mode (second valve closed state)
As shown in FIG. 3, the valve body 18 is pressed by the elasticity of the spring member 19 and is in close contact with the lower surface of the partition 9, and the valve 15 is connected to the second orifice 13 as in the general travel mode. Although the first and second liquid chambers 10 and 11 communicate with each other only through the first orifice 12, the actuator 2 is closed.
By the operation of 1, the control member 20 moves downward, and the contact surface 20b of the control member 20 separates from the lower surface of the sub-diaphragm 17.

Therefore, in this state, when vibration of a relatively high frequency and small amplitude accompanying high-speed running is input to the mount,
Since the sub-diaphragm 17 can perform the resonance operation without any support from below, the low dynamic spring at the time of high-speed running can be realized as shown in the graph of FIG.

Idle mode (valve open state): As shown in FIG. 5, the operation of the actuator 21 causes the control member 20 to move further downward, and the holding member 16 against the elasticity of the spring member 19. The sub-diaphragm 17 and the valve body 18 are moved downward, whereby the valve body 18
Is separated from the lower surface of the partition 9, and the second orifice 13 is opened.

Therefore, in this state, when a relatively high-frequency, small-amplitude vibration accompanying the idling of the engine is input to the mount, the hydraulic fluid 14 flows through the second orifice 13 having a relatively small flow resistance. From the second liquid chamber 11 to the first liquid chamber 10 to the second liquid chamber 11 and vice versa, thereby reducing the low dynamic spring during idling as shown in the graph of FIG. Can be realized.

[0034]

The present invention has the following effects.

That is, in the liquid-filled mount of the present invention having the above-described structure, the opening and closing of the second orifice provided with the sub-diaphragm is controlled by the first valve-closing state in which the control member is in contact with the sub-diaphragm, and the control. Three modes of a second valve closed state in which the member is separated from the sub-diaphragm and a valve open state are set. In the first valve closed state, the valve section is pushed by the elasticity of the spring member and the second valve closed state is opened. The two orifices are closed, and the plurality of liquid chambers communicate with each other only through the first orifice. In the valve section, the control member is in contact with the sub-diaphragm.

Therefore, in this state, when shake vibration of the engine having a relatively low frequency and a large amplitude is input to the mount, the hydraulic fluid flows through the first orifice, and the first fluid has a relatively large flow resistance. High attenuation is realized by the orifice. In addition, since the control member is in contact with and supports the sub-diaphragm, even if the hydraulic pressure presses the sub-diaphragm, the sub-diaphragm does not move or elastically deform, and the hydraulic fluid immediately flows to the first orifice. Start flowing.

Accordingly, high damping can be obtained, and the sub-diaphragm provided for absorbing high-frequency vibration does not move or elastically deform when its operation is not required, so that the damping operation for low-frequency vibration such as shake vibration is delayed. Can be prevented.

In the second valve closed state, the valve portion is pushed by the elasticity of the spring member to close the second orifice, and the plurality of liquid chambers communicate with each other only through the first orifice. The member is remote from the sub-diaphragm.

Therefore, in this state, when a relatively high-frequency, small-amplitude vibration accompanying high-speed running enters the mount,
Since the sub-diaphragm operates in resonance, a low dynamic spring at the time of high-speed running can be realized.

In the valve open state, the valve portion opens the second orifice against the elasticity of the spring member, and the plurality of liquid chambers communicate with each other through both the first and second orifices.

Therefore, in this state, when a relatively high-frequency, small-amplitude vibration accompanying the idling of the engine is input to the mount, the hydraulic fluid flows through the second orifice having a relatively small flow resistance. A low dynamic spring at the time of idling can be realized.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a first valve closed state of a liquid-filled mount according to an embodiment of the present invention.

FIG. 2 is a graph showing performance in the same state.

FIG. 3 is a half sectional view showing a second valve closed state of the liquid-filled mount.

FIG. 4 is a graph showing performance in the same state.

FIG. 5 is a half sectional view showing a valve-open state of the liquid-filled mount.

FIG. 6 is a graph showing performance in the same state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 One attachment part 2 Boss sleeve 3 The other attachment part 4 Case 5 Bracket 5a Through-hole 6 Elastic body 7 Diaphragm 8 Airtight space 9 Partition part 10 First liquid chamber 11 Second liquid chamber 12 First orifice 13 Second orifice 14 Hydraulic fluid 15 Valve section 16 Holding member 16a, 16b Engagement section 17 Sub-diaphragm 18 Valve body section 19 Spring member 20 Control member 20a Shaft section 20b Contact surface section 21 Actuator (drive source)

Claims (1)

[Claims] An attachment (1) and another attachment (3) are connected via an elastic body (6) made of a rubber-like elastic material, and a diaphragm (3) is connected to the other attachment (3). 7) are connected to form an airtight space (8), and the airtight space (8) is divided into a plurality of liquid chambers (10) (1) by a partition (9).
1), the plurality of liquid chambers (10) and (11) are communicated via a first orifice (12) and a second orifice (13) having a smaller flow resistance than the first orifice (12); A liquid-filled mount having a diaphragm (7) provided with a valve portion (15) for switching the opening and closing of the second orifice (13), wherein the valve portion (15) is attached to the diaphragm (7). A member (16) and the second orifice (1);
A sub-diaphragm (17) attached to the holding member (16) so as to face 3); a valve element (18) provided on the outer periphery of the sub-diaphragm (17); and the holding member (16) A spring member (19) for elastically urging the sub-diaphragm (17) and the valve body (18) in a valve closing direction; (16) The sub-diaphragm (17) and the valve body (18)
A control member (20) for moving the control member in the valve opening direction, and a drive source (21) for operating the control member (20). The control member (20) for opening and closing the second orifice (13) Is set in a first closed state in which is in contact with the sub-diaphragm (17), a second closed state in which the control member (20) is away from the sub-diaphragm (17), and an open state. A liquid-filled mount, characterized in that it has been mounted.