JP4393681B2 - Liquid seal vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid seal vibration isolator such as an engine mount, and more particularly to a device provided with a movable film for controlling the internal pressure of a main liquid chamber.
[0002]
[Prior art]
As a liquid seal vibration isolator, a movable film is provided on the side of the main liquid chamber, and a control chamber is connected to the movable film, and control is performed by switching the control chamber to negative pressure or open to the atmosphere. No. 10-38017 is provided with a movable film stopper that divides the control chamber into two rooms, connects the sealed air chamber to the movable film, and restricts the elastic deformation of the movable film to a predetermined amount. In addition, an open / close type idle orifice passage is provided which is opened during idling by an open / close valve to communicate the main liquid chamber and the sub liquid chamber.
In this structure, for relatively large inputs such as suspension inputs, when the control chamber is opened to the atmosphere, the increase in the internal pressure of the main fluid chamber is absorbed by lowering the rigidity of the movable membrane and elastically deforming it freely. it can.
On the other hand, when idling, the open / closed idle orifice passage is opened to allow the main liquid chamber and the sub liquid chamber to communicate with each other. The rigidity of the engine mount is increased and the flow rate of the liquid flowing from the main liquid chamber into the idle orifice passage is increased to efficiently generate the liquid column resonance, thereby reducing the spring of the engine mount.
[0003]
[Problems to be solved by the invention]
By the way, if the negative pressure is established by connecting the control room to the intake side of the engine, the movable film may be deteriorated by the gasoline flowing into the control room. In addition, when the control chamber is divided into two chambers with a movable membrane and a separate membrane member as in the above-described conventional example, the movable membrane is not deteriorated at first, but this separate membrane member is first deteriorated, and further, the movable membrane is further removed. Similarly, there is a risk of deterioration. If the movable film deteriorates and breaks in this way, the liquid in the main liquid chamber may flow directly into the intake side of the engine. Therefore, the present invention aims to eliminate such a fear.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, a liquid seal vibration isolator according to the present invention includes a first attachment member attached to either the vibration generating side or the vibration receiving side, a second attachment member attached to the other side, and these A main liquid chamber having the elastic main body member as a part of a wall, a sub liquid chamber partitioned by the main liquid chamber and a partition member and covered with a flexible membrane member, In addition, a part provided with a damping orifice passage that communicates with both liquid chambers, a part of the elastic main body member forms a cylindrical part supported by a substantially cylindrical rigid wall, and a part of the cylindrical part The movable membrane is elastically deformable, a control chamber is provided on the opposite side of the movable fluid membrane from the main liquid chamber, and the inside of the movable membrane can be switched between a negative pressure state and an open air state by connecting to the intake side of the engine, and bullet for regulating a predetermined amount of elastic deformation of the movable film in this control chamber Rutotomoni provided movable film stopper made of members, is interposed gasoline resistance film is a gasoline resistance layer formed on these separately from between the movable film stopper and the movable film, the outer periphery of the gasoline resistance film The portion is fixed by a movable film stopper and a movable film of an elastic member .
[0005]
At this time, the movable film stopper may be provided with a plurality of protrusions formed integrally and projecting toward the movable film side. Also , the gasoline resistant film can be bonded and integrated with the movable film.
[0006]
【The invention's effect】
By interposing a gasoline-resistant layer between the movable film stopper and the movable film, it is possible to prevent the movable film from being deteriorated by gasoline that has flowed into the control chamber, and the liquid in the main liquid chamber due to the breakage of the movable film is the intake side of the engine. Can be prevented.
[0007]
At this time, since a gasoline resistance film is a film member separate gasoline resistance layer, if the movable film can be constituted a double film structure that prevents liquid flow of more main liquid chamber be broken.
[0008]
In addition, the movable film itself can be made of a general and inexpensive material, and by combining this with a gasoline-resistant film, gasoline resistance can be easily obtained, and when a gasoline-resistant layer is unnecessary, Since the movable film can be used alone, it is versatile. Furthermore, if the gasoline-resistant film is integrated with the movable film by bonding or the like, the handleability is improved, and the assembly becomes easier as compared with the case of combining them separately.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment configured as an engine mount will be described with reference to the drawings. FIG. 1 is a full sectional view of the engine mount, and FIG. 2 is an enlarged view of a portion A in FIG.
[0010]
First, in FIG. 1, reference numeral 1 denotes a first attachment member attached to the engine side by a bolt portion 2, 3 denotes a second attachment member attached to the vehicle body side by a bolt 4, and 5 denotes an elastic main body member. It is made of an elastic member, and has a substantially conical dome portion 6 and a cylindrical portion 7 continuous therewith.
[0011]
The cylindrical portion 7 is bonded and integrated to the inner peripheral side of the substantially cylindrical rigid wall 8, and the outer peripheral side of the rigid wall 8 is integrated with the cylindrical portion 3 a formed as a part of the second mounting member 3. ing. A circular hole 9 is formed in a part of the cylindrical part 3a and the rigid wall 8, and a part of the cylindrical part 7 covering the cylindrical hole 7 forms a movable film 10 and is elastically deformable.
[0012]
The movable membrane 10 is covered with a holder 11 having a substantially funnel-shaped cross section from the outside of the cylindrical portion 3a, and a pipe portion 12 protruding from the outside from the center is connected to a switching valve 14a. Opening and connection to a negative pressure source, such as an engine intake negative pressure, are switched.
[0013]
The inside of the holder 11 forms a control chamber 13, and changes between an open air state and a negative pressure state by switching the switching valve. A movable film stopper 15 made of an elastic member such as rubber is provided between the holder 11 and the movable film 10 so as to restrict elastic deformation of the movable film 10 by a predetermined amount.
[0014]
The opening of the cylindrical portion 7 is covered with a partition member 16, and a main liquid chamber 20 having the elastic main body member 5 as a part of a wall is formed between the partition member 16 and the elastic main body member 5. On the opposite side of the partition member 16 from the main liquid chamber 20, a sub liquid chamber 22 covered with a diaphragm 21 is formed, and an incompressible liquid is sealed in the main liquid chamber 20 and the sub liquid chamber 22. The partition member 16 has a structure in which three members of an upper partition 17, an intermediate partition 18, and a lower partition 19 are overlapped, and each member is formed of an appropriate rigid material such as a synthetic resin.
[0015]
The partition member 16 is provided with first to third orifice passages, and a damping that is a spiral first orifice passage between the upper partition 17 and the intermediate partition 18 and between the intermediate partition 18 and the lower partition 19. An orifice passage 23 is formed, one end of which leads to a common passage 24 formed between the upper partition 17 and the intermediate partition 18, and the other end is an opening formed in a part of the lower partition 19 (not visible). To the secondary liquid chamber 22.
[0016]
Similarly, the common passage 24 communicates with an idle orifice passage 25, which is a second orifice passage formed in the upper partition 17, and an orifice hole 26 as a third orifice passage. The orifice hole 26 opens to the main liquid chamber. Thus, the damping orifice passage 23 always communicates with the main liquid chamber 20 and the sub liquid chamber 22 so as to generate a damping force and absorb a vibration with a relatively low frequency and a large amplitude such as a suspension vibration. It has become.
[0017]
The bottom of the orifice hole 26 is covered with an elastic film 27 made of an elastic member such as rubber, and the vibration of the elastic film 27 causes the liquid in the orifice hole 26 to resonate in a relatively high frequency range such as when starting. It is supposed to occur.
[0018]
An opening of an idle orifice passage 25 (not shown) faces the orifice hole 26, and the idle orifice passage 25 communicates with the damping orifice passage 23 via the common passage 24 as described above. These opening areas are not shown,
By setting the orifice hole 26> idle orifice passage 25> damping orifice passage 23 in this order, the resonance frequency of each liquid column resonance is tuned to decrease in this order.
[0019]
The idle orifice passage 25 has its outlet 28 on the side of the secondary liquid chamber 22 opened and closed by a thick wall portion 21a formed at the center of the diaphragm 21, and when opened, the main liquid chamber 20 and the secondary liquid chamber 22 communicate with each other. The vibration at the time is absorbed by the liquid column resonance on the higher frequency side than the damping orifice passage 23.
[0020]
The opening / closing operation of the thick portion 21a is performed by a separate opening / closing member 30. The opening / closing member 30 is biased by the return spring 31 toward the side where the thick portion 21a is brought into close contact with the periphery of the outlet 28, and forms a working chamber 32 which is a closed space between the bottom member 33 and the bottom member It communicates with a pipe portion 34 formed at the center of 33. The pipe part 34 is connected to the switching valve 14b, and switches between the atmospheric release state and the negative pressure state. When switching between the working chamber 32 and the control chamber 13 in synchronization, the switching valves 14a and 14b can be made common.
[0021]
When the inside of the working chamber 32 is brought into a negative pressure state, the opening / closing member 30 is pulled downward against the return spring 31. As a result, the thick portion 21a is separated from the periphery of the outlet 28, and the outlet 28 is opened. The orifice passage 25 is communicated with the main liquid chamber 20 and the sub liquid chamber 22. This communication state is performed at the time of idling. At the same time, by increasing the film rigidity of the movable film 10 by adsorbing and fixing the movable film 10 to the movable film stopper 15 by setting the inside of the control chamber 13 to a negative pressure, the inside of the main liquid chamber 20 is increased. A larger amount of liquid is fed into the idle orifice passage 25 to efficiently generate liquid column resonance, thereby reducing the dynamic spring of the engine mount in the idle vibration region.
[0022]
The partition member 16 is integrated on the inner peripheral side of the caulking flange 8a and the lower cylindrical member 35 by caulking the caulking flange 8a formed at the lower portion of the rigid wall 8 in the drawing and the upper portion of the lower cylindrical member 35. It is clamped and fixed between the fixed flange members 36. Further, the outer peripheral portions of the opening / closing member 30 and the bottom member 33 are overlapped and fixed by crimping the upper and lower ends of the ring member 37 integrated with the lower inner periphery of the lower cylindrical member 35 in the figure. Reference numeral 38 denotes a vent hole formed in the lower cylindrical member 35 so as to partially overlap the ring member 37.
[0023]
The second mounting member 3, the rigid wall 8, the lower cylindrical member 35, the fixed flange member 36, and the ring member 37 are all made of an appropriate material having rigidity such as metal. Reference numeral 39 in the figure denotes a medium-high frequency device having a substantially dish shape, which causes liquid column resonance with the dome portion 6 in the medium-high frequency range.
[0024]
Next, the structure of the movable film 10 and the movable film stopper 15 will be described in detail with reference to FIG. The movable film stopper 15 is made of an appropriate material rich in elasticity such as rubber and is a circular member corresponding to the shape of the circular hole 9, and a plurality of protrusions 41 are formed on the contact surface 40 facing the movable film 10. It is integrally formed to project toward the 10 side. The protrusion 41 is not continuous in the circumferential direction, and a discontinuous portion 42 that is partially divided is formed.
[0025]
A slight gap is easily formed between the movable film 10 and the contact surface 40 by the protrusion 41, and the central portion of the movable film stopper 15 is between the contact surface 40 and the opposite surface. Since the stopper hole 43 which is a through hole penetrating is formed, the gap 44 formed between the outer peripheral portion of the movable film stopper 15 and the movable film 10 is the discontinuous portion 42, the contact surface 44 and the movable film 10. It communicates with the control chamber 13 through the gap and the stopper hole 43.
[0026]
The movable film stopper 15 is formed integrally with the ring-shaped support plate 45, and the periphery of the support plate 45 is airtightly fitted to the inner surface of the opening 11 a of the holder 11 to be integrated with the holder 11. Of the seal flanges 46, 47 formed on both sides of the holder, the seal flange 46 is in close contact with the step 11 b on the inner surface of the holder 11, and the other seal flange 47 is integrated around the cylindrical hole 3 a and the circular hole 9 in the rigid wall 8. Are closely attached to the peripheral portion 10a of the opening of the movable film 10 raised. The holder 11 is integrated with the cylindrical portion 3a by an appropriate coupling means (not shown).
[0027]
An outer peripheral wall 48 of the upper partition 17 is formed on the inner side of the cylindrical portion 7 on which the movable film 10 is formed, and is opposed to the annular partition 49 formed between the outer peripheral wall 48 and the cylindrical portion 7. The movable film 10 faces. The movable film 10 is in a state indicated by an imaginary line in the figure when not deformed, and is in a positional relationship such that it slightly contacts the protrusion 41 but does not elastically deform it.
[0028]
Further, when the movable film 10 is elastically deformed outward due to an increase in the internal pressure of the main liquid chamber 20, first, the protrusion 41 comes into contact with the protrusion 41 via the gasoline-resistant film 50. Deform and approach the contact surface 40 from the center. Even if the projection 41 is sufficiently elastically deformed, if there is a larger vibration input, the movable film 10 is further elastically deformed while elastically deforming the movable film stopper 15 itself. The shape of the protrusion 41 can be variously modified.
[0029]
Further, a gasoline resistant film 50 formed separately is interposed on the movable film stopper 15 side of the movable film 10. The gasoline resistant film 50 is a member made of an appropriate material such as hydrin rubber having excellent gasoline resistance and elasticity, and is formed in substantially the same shape as the movable film 10. In this embodiment, the movable film 10 is on the movable film stopper 15 side. An adhesive layer 51 made of an adhesive material is appropriately formed on the surface and bonded and integrated (FIG. 2). However, the gasoline-resistant film 50 may not be bonded and integrated with the movable film 10, but may be simply covered with the surface of the movable film 10 on the control chamber 13 side.
A ring-shaped peripheral wall 52 that protrudes from the tip 51 toward the movable film stopper 15 is integrally formed on the outer peripheral portion of the gasoline-resistant film 50, and the ring-shaped peripheral wall 52 serves as a tip-side outer peripheral portion 53 of the movable film stopper 15. And the front end portion 54 of the holder 11 is in contact with the outer peripheral portion of the front end 51 at the outer peripheral portion of the gasoline-resistant film 50 with respect to the outer peripheral side of the peripheral wall 52. By press-contacting with the surrounding part 10a, the gasoline-resistant film | membrane 50 is correctly positioned and the fixation with high sealing performance is implement | achieved.
[0030]
Next, the operation of this embodiment will be described. By applying a negative pressure to the control chamber 13 through the intake side of the engine, even if gasoline flows into the control chamber 13, the gasoline resistant film 50 exists, so that the gasoline is not brought into contact with the movable film 10. For this reason, deterioration of not only the gasoline resistant film 50 but also the movable film 10 due to gasoline can be prevented. As a result, the gasoline resistance is improved, the breakage due to the deterioration of the movable film 10 is prevented, and the liquid in the main liquid chamber is the engine. Can be prevented from flowing out to the intake side.
[0031]
Further, even if the movable film 10 is broken, if the gasoline resistant film 50 is not broken together, the liquid outflow of the main liquid chamber can be prevented, so that the liquid outflow is surely prevented. In addition, since the gasoline resistant film 50 is rich in elasticity, even if it is integrated with the movable film 10, it can be elastically deformed integrally with the movable film 10, so that the elastic deformation of the movable film 10 is not hindered.
[0032]
In addition, by providing the gasoline-resistant film 50, the movable film 10 itself can use a general inexpensive material, so that a movable film having gasoline resistance can be formed at a low cost as a whole.
[0033]
In addition, this invention is not limited to the said Example, A various deformation | transformation and application are possible. For example, if the gasoline-resistant film 50 is not bonded and integrated with the movable film 10 and left as described above, the possibility of breaking together with the movable film 10 can be further reduced. In this case, it is not necessary to overlap the gasoline resistant film 50 with the movable film 10, and for example, it can be provided as an independent film member that partitions the control chamber 13 behind the movable film stopper 15. In addition, the gasoline resistant film 50 may be integrated by mechanical means such as rivet caulking or the like even when the movable film 10 is integrated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an engine mount according to an embodiment. FIG. 2 is an enlarged view of a part A in FIG.
1: 1st mounting member, 2: 2nd mounting member, 5: elastic body member, 7: cylindrical part, 9: circular hole, 10: movable membrane, 13: control chamber, 14: switching valve, 15: movable membrane Stopper , 16: Partition member, 20: Main liquid chamber, 21: Diaphragm, 22: Secondary liquid chamber, 23: Damping orifice passage, 24: Common passage, 25: Idle orifice passage, 26: Orifice hole, 28: Outlet, 30: Opening / closing member, 40: Contact surface, 41: Projection, 42: Discontinuous part, 43: Stopper hole, 44: Gap, 50: Gasoline resistant film

Claims (4)

A first attachment member attached to either the vibration generating side or the vibration receiving side; a second attachment member attached to the other side; and an elastic body member interposed therebetween, the elastic body member being A liquid having a main liquid chamber as a part of a wall, a sub liquid chamber that is partitioned by the main liquid chamber and a partition member and covered with a flexible membrane member, and an attenuation orifice passage that connects both the liquid chambers. In the seal vibration isolator, a part of the elastic main body member forms a cylindrical part supported by a substantially cylindrical rigid body wall, and a part of the cylindrical part is an elastically deformable movable film. a control chamber provided on the opposite side of the main liquid chamber, and freely switch the inside thereof and a negative pressure state and the atmosphere release state by connecting the intake side of the engine, and own the elastic deformation of the movable film in this control chamber Rutotomo provided movable film stopper made of an elastic member for restricting a quantitative , By interposing a gasoline resistance film is a gasoline resistance layer formed on these separately from between the movable film stopper and the movable film, the movable film stopper and movable to an outer peripheral portion of the gasoline resistance film elastic member Liquid seal vibration isolator characterized by being fixed with a film . The liquid seal vibration isolator according to claim 1, wherein the movable film stopper is provided with a plurality of protrusions that are integrally projected toward the movable film side . The liquid seal vibration isolator according to claim 1, wherein the gasoline resistant film is made of an elastic member . The liquid seal vibration isolator according to claim 1 , wherein the gasoline resistant film is integrated with a movable film.

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