US20010052664A1 - Fluid-sealed anti-vibration device - Google Patents
Fluid-sealed anti-vibration device Download PDFInfo
- Publication number
- US20010052664A1 US20010052664A1 US09/739,803 US73980300A US2001052664A1 US 20010052664 A1 US20010052664 A1 US 20010052664A1 US 73980300 A US73980300 A US 73980300A US 2001052664 A1 US2001052664 A1 US 2001052664A1
- Authority
- US
- United States
- Prior art keywords
- fluid chamber
- wall
- membrane
- section
- elastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
- F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
- F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
- F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
- F16F13/105—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by features of partitions between two working chambers
- F16F13/106—Design of constituent elastomeric parts, e.g. decoupling valve elements, or of immediate abutments therefor, e.g. cages
Definitions
- the present invention relates to a fluid-sealed anti-vibration device suitable for use in an engine mount for an automobile and the like.
- a fluid-sealed anti-vibration device is known in the prior art wherein an elastic horizontal movable membrane is provided in a part of a side wall member which encloses a main fluid chamber to absorb the change of internal pressure in the main fluid chamber (one example, Japanese Unexamined Patent Publication No. Hei 10-281214).
- a fluid-sealed anti-vibration device is known in the prior art wherein an elastic membrane is formed as a circular member and the fluctuation of fluid pressure in a main fluid chamber can be absorbed by elastic deformation of the elastic membrane.
- the elastic membrane is integrally provided with a stopper projection serving as a circular wall.
- the stopper projection is formed on the surface of the elastic membrane on a sub-fluid chamber side.
- a spring constant is nonlinearly changed by allowing the stopper projection to abut a partition member and the like.
- the dynamic spring constant can be generally lowered, but as shown by a dashed line in FIG. 6, a peak of the dynamic spring constant is in a medium frequency range. It is considered that this peak is generated as a reaction to the resonance of the horizontal movable membrane (the peak which is a maximum value of such a dynamic spring constant is hereinafter referred to as “dynamic spring peak”, while the minimum value is referred to as “dynamic spring bottom”).
- a frequency below 500 Hz is defined as low frequency
- a frequency between 100 and 500 Hz is defined as medium frequency
- a frequency above 500 Hz is defined as high frequency.
- the abscissa is the frequency
- the ordinate is the dynamic spring constant (absolute value of complex spring constant).
- the primary object of the present invention is to overcome the abovementioned problems and to provide a fluid-sealed anti-vibration device comprising a first connecting member secured to a source of vibration, a second connecting member secured to a car body, a substantially cone-shaped elastic body member positioned therebetween, a fluid chamber which is formed by the first connecting member, the second connecting member and the elastic body member, and of which the wall is a part of the elastic body member, the fluid chamber being divided by a partition wall into a main fluid chamber and a sub-fluid chamber, and an orifice provided in the partition wall to communicate with the main fluid chamber and the sub-fluid chamber, characterized in that an elastic horizontally movable membrane is formed in a side wall member which encloses the main fluid chamber in a substantially cylindrical manner, and a control wall is provided in the main fluid chamber to face the horizontally movable membrane at intervals.
- the horizontally movable membrane is integrally formed with the elastic body member.
- the control wall can be provided integrally with or separately from the partition member.
- a plurality of horizontally movable membrane can be provided to allow the eigen value of each horizontally movable membrane to be changed.
- a circular wall is formed inside the side wall member to face the side wall member at intervals, space provided between the circular wall and the side wall member opens to the main fluid chamber, and a part of the circular wall facing the horizontally movable membrane is the control wall.
- an elastic membrane is provided on the partition member and adapted to be elastically deformed as a result of the fluctuation of internal pressure in the main fluid chamber, the elastic membrane is formed as a non-circular member with a long side section and a short side section and provided in the central part thereof with a curved groove running substantially parallel to the long side section.
- a stopper projection is integrally provided substantially parallel to the curved groove.
- the stopper projection can be formed only on the long side section.
- the periphery of the elastic membrane is integrally formed with a continuous, circular peripheral wall that is retained by the partition member, and a clearance can also be provided at the retaining section by the partition member so as to permit deformation of the peripheral wall.
- the partition member is provided with first to third passages of which the first passage is the damping passage for always communicating with the main fluid and sub-fluid chambers, the second passage can be freely opened and closed, and the third passage, of which part is covered by the elastic membrane which is elastically deformable to shut off the communication with the main fluid and sub-fluid chambers, and the elastic membrane is formed as the non-circular member.
- a control wall is provided to face a horizontally movable membrane, pressure on the horizontally movable membrane generated as a result of vibration of an elastic body member is controlled by the control wall and the dynamic spring constant is lowered by membrane resonance. As a result, generation of a dynamic spring peak generated in medium frequency range can be controlled.
- formation of the dynamic spring peak can be freely controlled by changing the size of the control wall.
- the dynamic spring peak can be controlled by changing the clearance between the horizontally movable membrane and the control wall. Accordingly, the fluid-sealed anti-vibration device can be regulated by changing the setting of the control wall.
- the second invention a plurality of horizontally movable membranes is provided, wherein if the eigen value of each membrane is changed, the resonance of each horizontally movable membrane is generated in different eigen values and coupled resonance which is wide as a whole is generated.
- the eigen value is defined as individual resonance frequency, which varies with the size, thickness, materials (spring constant) and the like of the horizontally movable membrane.
- the elastic membrane when the internal pressure of the main fluid chamber increases, the elastic membrane is sheared to bend and deform at the curved groove which is located in the center thereof and runs substantially parallel to the long side section, and which serves as a flexural center.
- the elastic membrane is formed as the non-circular member with the long and short side sections, it can easily bend in response to the increase in the internal pressure in the main fluid chamber.
- it is possible to absorb the increase in internal pressure of the main fluid chamber by utilizing the low dynamic spring effect.
- the stopper projection is projectingly formed on a surface opposite to the curved groove of the non-circular member, when large vibrations are input to the main fluid chamber, the stopper projection abuts the side of the partition member, whereby the spring constant of the elastic membrane changes nonlinearly and, as a result, the large input can be absorbed. Further, by providing the stopper projection only on the long side section to provide a discontinuous shape, the elastic membrane can be easily bent.
- the partition member Since the clearance is provided at the section where the partition member retains the peripheral wall of the elastic membrane, it is possible to realize easier deformation of the elastic membrane. Further, the partition member is provided with first to third passages, of which the first orifice passage is the damping orifice passage for always communicating with the main fluid and sub-fluid chambers, the second passage can be freely opened and closed, and the third passage, of which part is covered by the elastic membrane to shut off the communication with the main fluid and sub-fluid chambers.
- the elastic membrane as the non-circular member, it is possible to provide an efficient layout even in such a limited space as that of the partition member where the circular member can not be positioned.
- FIG. 1 is an entire cross-sectional view of a device according to a first embodiment (corresponding to a view taken along line 1 - 1 of FIG. 2);
- FIG. 2 is a plan view of the external appearance of the device
- FIG. 3 is an enlarged cross-sectional view of basic parts of the device
- FIG. 4 is a plan view of a partition member section of the device
- FIG. 5 is a partial cross-sectional view showing the change in height of a control wall of the device
- FIG. 6 is a graph showing the change in dynamic spring constant caused by the control wall
- FIG. 7 is a partial cross-section view showing the change in clearance of the control wall
- FIG. 8 is a graph showing the change in dynamic spring effect caused by the clearance change
- FIG. 9 is a development elevation depicting two movable membranes shown side by side according to a fourth embodiment.
- FIG. 10 is a graph showing the effect of the fourth embodiment.
- FIG. 11 is an entire cross-sectional view of an engine mount according to an embodiment
- FIG. 12 is an enlarged view of Section A of FIG. 11;
- FIG. 13 is a plan view of an elastic membrane according to the embodiment viewed from a side of a main fluid chamber;
- FIG. 14 is a cross-sectional view of the elastic membrane taken along line 14 - 14 of FIG. 13;
- FIG. 15 is a cross-sectional view of the elastic membrane taken along line 15 - 15 of FIG. 13;
- FIG. 16 is a bottom view of the elastic membrane
- FIG. 17 is a graph showing dynamic spring characteristics in the case of a low amplitude.
- FIG. 18 is a graph showing damping characteristics in the case of large amplitude.
- an engine mount as a fluid-sealed anti-vibration device has a first connecting member 1 , a second connecting member 2 and an elastic body member 3 .
- the first connecting member 1 is secured to an engine (not shown) by a screw member 4 and the second connecting member 2 is secured to the automobile body (not shown) by a flange 5 .
- the elastic body member 3 is a substantially cone-shaped member constructed of a suitable elastic material such as a known rubber, of which the top section is integrally penetrated by the first connecting member 1 .
- a lower circumference of the elastic body member 3 is provided with a flange 6 which is integrally connected to a flange metal fitting 7 formed as a part of the second connecting member 2 .
- a lower section of the elastic body member 3 extends further downward from the flange 6 to form an inner lining section 8 which extends cylindrically and is integrally secured to an inner surface of a side wall member 9 .
- the side wall member 9 forms a part of the second connecting member 2 , the outside of which is integrally connected to the flange metal fitting 7 by welding.
- the circumference of the side wall member 9 is provided with round holes 10 at intervals of 180° in the circumferential direction.
- the inner lining section 8 is not supported by the side wall member 9 at the round hole 10 section and forms a horizontally movable membrane 11 which can undergo free elastic deformation.
- Round grooves 12 are formed at the circumferential locations of the horizontally movable membrane 11 corresponding to the inside of the round holes 10 so that the horizontally movable membrane 11 can be easily deformed.
- the lower section of the side wall member 9 is integrally secured to a flange 14 of a cylindrical base section 13 of the second connecting member 2 by caulking.
- the circumference of a partition member 15 and the circumference of a diaphragm 16 are secured to a junction of the side wall member 9 and the cylindrical base section 13 .
- the partition member 15 forms a main fluid chamber 17 together with the elastic body member 3 and forms a sub-fluid chamber 18 together with the diaphragm 16 .
- the main fluid chamber 17 and the sub-fluid chamber 18 communicate through an idle orifice 20 for absorbing idling vibration formed in the partition member 15 , and a damping orifice 21 for absorbing low frequency vibration.
- the idle orifice 20 is an opening and closing type of orifice which opens only at the time of idling, while the damping orifice 21 is always open.
- an outlet 22 of the idle orifice 20 is closed when the top of a hollow valve 24 presses the central section 23 of the diaphragm 16 toward the outlet 22 .
- the outlet 22 is opened when the inside of the valve 24 is forced from a communication passage 26 by a source of negative pressure (not shown) to provide a negative pressure and the valve 24 is lowered against a return spring 25 disposed therein, thereby allowing communication with the main fluid chamber 17 and the sub-fluid chamber 18 .
- the valve 24 is formed by covering the surface of a cup-shaped core bar member 27 with an elastic body 28 .
- the lower periphery of the elastic body 28 closely adheres to a lid-shaped member 29 which engages a bottom section of the first connecting member 1 , so that the inside is maintained in an air-tight condition.
- a supporting cylindrical metal fitting 30 engages the inside of the cylindrical base section 13 .
- the upper end of the supporting cylindrical metal fitting 30 forms an inner flange 31 whereby the periphery of the diaphragm 16 is positioned between the flange 31 and the partition member 15 .
- the middle section of the metal fitting 30 is provided with a step 32 projecting inward.
- the lower end of the metal fitting 30 is bent inward to form a caulking section 33 which overlaps the periphery of the lid-shaped member 29 .
- a thickened end section 34 formed on the periphery of the elastic body 28 is positioned between the step 32 and the caulking section 33 whereby the end section 34 is caused to closely adhere to the lid-shaped member 29 .
- Reference numeral 35 in FIG. 1 is a medium and high frequency device, formed in a cup-shape which opens downward.
- the device 35 is secured to the lower end of the first connecting member 1 which projects into the main fluid chamber 17 .
- the device 35 is adapted to move vertically together with the first connecting member 1 so as to generate fluid column resonance in the medium and high frequency range within the clearance formed between the medium and high frequency device 35 and the elastic body member 3 .
- Reference numeral 36 is a stopper formed at the end of a stopper arm 37 which extends in the radial direction from the first connecting member 1 .
- the stopper 36 enters a stopper bracket 38 formed in an arch shape upward from the flange metal fitting 7 and contacts the flange 6 at the time of large vibration to control deformation of more than a fixed level.
- the partition member 15 is arranged to overlap three members, an upper member 40 , an intermediate member 41 , and an lower member 42 vertically, with the intermediate member 41 situated between the upper and lower members.
- the upper member 40 is constructed of a comparatively rigid plastic material.
- a flange 43 is formed on the circumference thereof and a circular wall 44 is formed inside the flange 43 projecting upward. Both the flange 43 and the circular wall 44 are integrally formed with the upper member 40 .
- the circular wall 44 faces the side wall member 9 with a predetermined clearance therebetween and in particular, a part of the circular wall 44 facing the horizontally movable membrane 11 forms a control wall 44 a of the present invention.
- the circular wall 44 is provided with a recess 45 in the inside thereof, of which the lower surface is formed with an idle orifice groove 46 in a vortex manner.
- One end of the idle orifice groove 46 forms an inlet 47 which opens into the recess 45 , while the other end is guided to the center direction of the recess 45 and opens downward to communicate with the outlet 22 which is formed substantially in the center of the lower member 42 .
- the idle orifice groove 46 overlaps the intermediate member 41 located thereunder which closes the open section thereof, thereby forming the idle orifice 20 .
- the intermediate member 41 is constructed of a comparatively soft elastic material such as rubber and has a groove 50 which opens upward at a position outside the idle orifice 20 .
- the open end of the groove 50 is closed by the flange 43 to form a part of the damping orifice 21 .
- the groove 50 communicates with the main fluid chamber 17 through an inlet 51 which is formed in one end of the flange 43 and communicates with the damping orifice 21 on the side of the lower member 42 at a communicating opening 52 which is formed in other end of the flange 43 .
- a border section between an outer peripheral side of an inner periphery section 48 and the groove 50 is provided with a slope 49 .
- the intermediate member 41 is also provided with a slope 41 a at a border section between the idle orifice groove 50 and the flange 43 .
- the faces of the two slopes 49 and 41 a are arranged to slide with respect to one another.
- the lower member 42 is also constructed of comparatively rigid material such as resin in the same manner as the upper member 40 .
- a groove 53 which opens upward is formed in the outer periphery of the lower member 42 and is closed by the bottom section of the intermediate member 41 to form a part of the damping orifice 21 .
- the positions of the two grooves 53 , 50 partially overlap, wherein one end of the groove 53 communicates with the communicating opening 52 , while the other end forms an outlet 55 which opens into the sub-fluid chamber 18 .
- FIG. 6 a device with the circular wall 44 is compared with a device without the wall 44 (see a dashed line).
- the dynamic spring peak can be remarkably controlled compared with the device without the wall 44 .
- the dynamic spring peak P 3 in the case where the circular wall 44 is not provided is much higher than the peaks P 1 , P 2 in the case where different sizes of circular walls 44 are provided.
- the height of the circular wall 44 (i.e. the height which correlates with the size for covering he horizontally movable membrane 11 ) can be optionally set, for example, to the same height as the horizontally movable membrane 11 , i.e. a height of 100% covered (see the solid line) and to a height slightly lower than that of the horizontally movable membrane 11 , i.e. a height of 75% covered (see the broken lie).
- FIG. 9 relates to a fourth embodiment and is a development elevation depicting two horizontally movable membranes 11 facing at intervals of 180°, shown side by side.
- the diameter of one of the horizontally movable membranes 11 A is D 1
- the diameter of the other 11 B is D 2
- the relationship between the two horizontally movable membranes is changed to: D 1 ⁇ D 2 .
- FIG. 10 is a graph showing the coupled resonance, in which a combination of two different kinds of horizontally movable membranes (large size and small size) indicated by a dashed line clearly shows a smaller dynamic spring peak P 7 (highest one is shown) than a single use of the horizontally movable membrane (i.e. same as the first embodiment) shown by a solid line.
- the present invention is not limited to the embodiments described above, but may be varied in many ways.
- the circular wall 44 is not provided, but an independent control wall 44 a may be provided only at a section where it corresponds to the horizontally movable membrane 11 . In this manner, it is also possible to fully control the resonance of the horizontally movable membrane 11 .
- the control wall 44 a or the circular wall 44 may be provided separately from the partition member 15 .
- FIG. 11 is an entire cross-sectional view of the engine mount and FIG. 12 is an enlarged view of Section A of FIG. 11.
- reference numeral 101 is a first connecting member which is secured to an engine side by a bolt element 102 and reference numeral 103 is a second connecting member secured to a body side by a bolt 104 .
- 105 is an elastic body member constructed of a suitable elastic material such as rubber, which has a substantially cone-shaped dome element 106 and a cylindrical element 107 following the dome element 106 .
- the cylindrical element 107 integrally adheres to an inner peripheral side of a substantially cylindrical rigid body wall 108 of which the outer peripheral side integrally overlaps a cylindrical element 103 a formed as a part of the second connecting member 103 .
- a part of the cylindrical element 103 a and the rigid body wall 108 is formed with a circular hole 109 which is covered by a part of the cylindrical element 107 .
- the part of the cylindrical element 107 serves as a movable membrane 110 which is elastically deformable.
- the movable membrane 110 is covered by a holder 111 with a substantially funnel-shaped section from the outside of the cylindrical element 103 a .
- a pipe element 112 projecting outward from the central part of the holder 111 is connected to a switching valve 114 a . Switching an atmospheric release or connection to a negative pressure source such as depression at engine manifold can be performed by this switching valve 14 a.
- the inside of the holder 111 forms a control chamber 113 which is changed to an atmospheric release condition or to a negative pressure condition by operation of the switching valve 114 a .
- a movable membrane stopper 115 composed of an elastic member such as rubber is provided between the holder 111 and the movable membrane 110 to control the elastic deformation of the movable membrane 110 at a predetermined level.
- An opening section of the cylindrical element 107 is covered by a partition member 116 .
- a partition member 116 Formed between the partition member 116 and the elastic body member 105 is a main fluid chamber 120 of which the wall is part of the elastic body member 105 .
- a sub-fluid chamber 122 is formed on the side of the partition member 116 opposite to the main fluid chamber 120 and is covered by a diaphragm 121 .
- An incompressible fluid is filled into and sealed in the main fluid chamber 120 and the sub-fluid chamber 122 .
- the partition member 116 is formed by overlapping three members, an upper partition 117 , an intermediate partition 118 , and a lower partition 119 of which each member is composed of a suitable rigid material such as synthetic resin.
- a circular wall 140 is integrally formed projecting upward.
- the circular wall 140 faces the side wall member 108 with a predetermined clearance therebetween and in particular, a part of the circular wall 140 facing the horizontally movable membrane 110 forms a control wall 141 .
- a gap with a predetermined size is formed between the control wall 141 and the horizontally movable membrane 110 .
- a helical damping orifice passage 123 Formed between the upper partition 117 and the intermediate partition 118 , and between the intermediate partition 118 and the lower partition 119 is a helical damping orifice passage 123 , of which one end communicates with a common passage 124 formed between the upper partition 117 and the intermediate partition 118 and the other end communicates with the sub-fluid chamber 122 through an opening section (not shown in the figure) formed at a part of the lower partition 119 .
- the common passage 124 then communicates with an idle orifice passage 125 which is a second passage formed in the upper partition 117 , and with an orifice hall 126 serving as a third orifice passage in sequence.
- the orifice hall 126 opens to the main fluid chamber 120 . Therefore, the common passage 124 always communicates with the main fluid chamber 120 and the sub-fluid chamber 122 to generate a damping force relative to vibration with a comparatively low frequency and large amplitude such as suspension vibration, thereby absorbing the vibration.
- the bottom section of the orifice hall 126 is covered by an elastic membrane 127 composed of an elastic material such as rubber whereby the communication of the orifice hall 126 with the sub-fluid chamber 122 is shut off. With the vibration of this elastic membrane 127 , the fluid in the orifice hall 126 generates fluid column resonance in a comparatively higher frequency range such as when a vehicle starts.
- An opening section (not shown) of the idle orifice passage 125 opens to the orifice hall 126 which communicates with the damping orifice passage 123 through the common passage 124 as described above. Although these opening areas are not shown in the figure, the resonance frequency of each fluid column resonance is tuned in order of the relation: the orifice hall 126 >the idle orifice passage 125 >the damping orifice passage 123 .
- the outlet 128 of the idle orifice passage 125 on the side of the sub-fluid chamber 122 is opened or closed by a thick section 121 a which is formed at the central part of the diaphragm 121 .
- the idle orifice passage 125 communicates with the main fluid chamber 120 and the sub-fluid chamber 122 to fluid-resonate and absorb the vibrations during idling on a higher frequency side than the damping orifice passage 123 .
- Opening and closing operations of the thick section 121 a mare performed by a separate opening and closing member 130 .
- the opening and closing member 130 is so arranged that the thick section 121 a is biased toward the periphery of the outlet 128 by a return spring 131 and forms a closed actuating chamber 132 between itself and a bottom member 133 to communicate with a pipe element 134 which is formed on the central part of the bottom member 133 .
- the pipe element 134 is connected to the switching valve 114 b to switch the atmospheric release condition or the negative pressure condition.
- the opening and closing member 130 is lowered downward in the figure against the return spring 131 to remove the thick section 121 a from the periphery of the outlet 128 , whereby the outlet 128 is opened so that the idle orifice passage 125 communicates with the main fluid chamber 125 and the sub-fluid chamber 122 .
- each outer peripheral section of the opening and closing member 130 and the bottom member 133 is overlapped and secured by clamping the upper and lower ends of a ring member 137 which is integrally situated on the inner periphery of the lower section of the lower cylindrical member 135 in the figure.
- Reference numeral 138 is an air hole formed on the lower cylindrical member 35 so that it overlaps partially the ring member 137 .
- Each of the second connecting member 103 , the rigid body wall 108 , the lower cylindrical member 135 , the fixing flange member 136 , and the ring member 137 is composed of a suitable material with stiffness properties such as a metal.
- Reference numeral 139 in the figure is a substantially plate-shaped intermediate and high frequency device that is adapted to generate fluid column resonance between itself and the dome element 106 in intermediate and high frequency ranges.
- the elastic membrane 127 of which the body section 150 crosses the intermediate section of the orifice hall 126 is provided on the central section thereof with a curved groove 151 on the main fluid chamber 120 side.
- a pair of stopper projections 152 , 152 is projectingly provided on a surface of the sub-fluid chamber 122 opposite to the curved groove 151 to position the central section of the elastic membrane therebetween.
- the outside ends of the stopper projections are provided with abutting slopes 153 , 153 , respectively.
- a curved recess 154 is formed between the stopper projections 152 , 152 .
- the periphery of the body section 150 is formed with a thin section 155 and a vertical wall-shaped peripheral wall 156 is provided at the edge section outside the thin section 155 to enclose the body section 150 circularly.
- the elastic membrane 127 is formed in an oval shape with a linear long side section 157 and an arc-shaped short side section 158 and a curved groove 151 is formed parallel to and within the range of the long side section 157 .
- the short side section 158 is a radius section connecting the end sections of the long side sections 157 , 157
- the short side is a section enclosed by a straight line connecting the end sections of the long side sections 157 , 157 and the short side section 158 .
- the stopper projection 152 is also paired to position the curved groove 151 therebetween and is formed parallel to the curved groove 151 and the long side section 57 . Both ends of each stopper projection 152 in the longitudinal direction are formed as free ends, and no stopper projection is formed connecting these opposing free ends in the short side section 158 .
- the thin section 155 and the peripheral wall 156 are circularly formed in succession on the front and back of an elastic membrane 127 and the peripheral wall 156 is formed to project long on two sides.
- the projecting length of the peripheral wall 156 in the present embodiment is longer than that of the stopper projection 152 .
- the upper side of this peripheral wall 156 engages a circular groove 161 formed on forked sections 60 of the upper partition 117 .
- An inner peripheral section 162 of the forked section 160 is provided with a step to narrow the passage cross-section at the intermediate section of the orifice hall 126 and a surface facing the circular groove 161 is formed with a slope 163 and the end of the inner peripheral section 162 is close to the thin section 155 .
- the slope 163 serves to allow the peripheral wall 156 which originally stands upright as shown in a vertical line, to bend outward.
- the end of the slope 163 provides a clearance 164 between itself and the peripheral wall 156 to permit elastic deformation of the peripheral wall 156 when bent inwardly.
- the lower side of the peripheral wall 156 in FIG. 12 engages the circular groove 166 formed on a forked section 165 of the lower partition 119 .
- the inner peripheral section 167 of the forked section 165 is provided with a narrow section in the area where a part of the end of the inner peripheral section 167 is close to the thin section 155 of the elastic membrane 127 so that a predetermined clearance is formed between the inner peripheral section 167 and the stopper projection 152 .
- the intermediate section of the inner peripheral section 167 is formed in a slant and a step 168 on a slant to face the abutting slope 153 of the elastic membrane 127 and the lower section thereof is provided with a widened section.
- the elastic membrane 127 easily undergoes elastic deformation in response to the increase of internal pressure of the main fluid chamber 120 to absorb the increase of the internal pressure, wherein the low dynamic spring effect can be realized.
- each end of the stopper projections 152 , 152 in the longitudinal direction is provided as a free end, and the stopper projection 152 is not formed on the side of the short side section to provide a discontinuous shape. It is therefore easier to bend the elastic membrane in the direction of the short side section 158 .
- the spring constant is also non-linearly changed in proportion to the magnitude of the vibration.
- the quantity of flow flowing into the damping orifice passage 123 is increased to generate fluid column resonance in the damping orifice passage 123 , wherein a larger damping force is generated and the vibration is thus absorbed.
- FIG. 17 is a graph showing the relation between the dynamic spring constant and the frequency in the case of a small amplitude and FIG. 18 is a graph showing damping characteristics in the case of a large amplitude, wherein a solid line shows the present embodiment, while a broken line shows a comparative example in which the same oval shape as the present embodiment is utilized, but the curved groove 151 is not provided and the stopper projection is formed circularly.
- FIG. 17 shows that the present embodiment can realize a remarkable low dynamic spring effect
- FIG. 18 shows that almost the same high damping as the prior art can be realized.
- the partition member 116 is horizontally provided with three passages of the damping orifice passage 123 , the idle orifice passage 125 , and the orifice hall 126 , if the elastic membrane 127 provided in the orifice hall 126 is formed as an oval, non-circular member, it is possible to arrange the elastic membrane 127 even in difficult layout conditions in which a circular elastic membrane 127 can not be provided.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combined Devices Of Dampers And Springs (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
Abstract
A first connecting member is connected to a second connecting member by an elastic body member. A fluid chamber which is formed inside the first connecting member, the second connecting member and the elastic body member is divided into a main fluid chamber 17 and a sub-fluid chamber 18 by a partition member 15. An idle orifice 20 and a damping orifice 21 communicate with both chambers. In a part of a side wall member 9 which forms the main fluid chamber 17 is formed a round hole 10 which is covered by a part of the elastic body member to form a horizontally movable membrane 11. A circular wall 44 is integrally formed with the partition member 15 to face the horizontal movable membrane 11 at predetermined intervals. Resonance of the horizontal membrane 11 generated as a result of fluctuations of internal pressure in the main fluid chamber is controlled by the circular wall 44.
Description
- 1. Field of the Invention
- The present invention relates to a fluid-sealed anti-vibration device suitable for use in an engine mount for an automobile and the like.
- 2. Description of the Prior Art
- A fluid-sealed anti-vibration device is known in the prior art wherein an elastic horizontal movable membrane is provided in a part of a side wall member which encloses a main fluid chamber to absorb the change of internal pressure in the main fluid chamber (one example, Japanese Unexamined Patent Publication No. Hei 10-281214).
- Moreover, a fluid-sealed anti-vibration device is known in the prior art wherein an elastic membrane is formed as a circular member and the fluctuation of fluid pressure in a main fluid chamber can be absorbed by elastic deformation of the elastic membrane. The elastic membrane is integrally provided with a stopper projection serving as a circular wall. The stopper projection is formed on the surface of the elastic membrane on a sub-fluid chamber side. In the case of elastic deformation above a predetermined level, in particular, a spring constant is nonlinearly changed by allowing the stopper projection to abut a partition member and the like.
- In the case where such a horizontal movable membrane is provided, the dynamic spring constant can be generally lowered, but as shown by a dashed line in FIG. 6, a peak of the dynamic spring constant is in a medium frequency range. It is considered that this peak is generated as a reaction to the resonance of the horizontal movable membrane (the peak which is a maximum value of such a dynamic spring constant is hereinafter referred to as “dynamic spring peak”, while the minimum value is referred to as “dynamic spring bottom”).
- It is an object of the present invention to control the resonance of a horizontal movable membrane so that generation of the dynamic spring peak can be controlled. In the present invention, a frequency below 500 Hz is defined as low frequency, a frequency between 100 and 500 Hz is defined as medium frequency, and a frequency above 500 Hz is defined as high frequency. In each graph in FIG. 6 and the like, the abscissa is the frequency, and the ordinate is the dynamic spring constant (absolute value of complex spring constant).
- When an elastic membrane is provided in a partition member, there is a case where a circular elastic membrane can not be disposed due to layout conditions and must be changed to a non-circular member with a long side section and a short side section such as an oval shaped member. However, if the conventional circular elastic membrane is simply changed to a non-circular member such as that with an oval shape and the like, there is some possibility that the elastic membrane must be retained by the elastic membrane along the long side section for a long period of time, and since the stopper projection continues circularly, the elastic membrane can not be easily bent in response to the fluctuation of fluid pressure of a main fluid chamber. As a result, it is difficult to absorb the increase in the internal pressure. It is therefore an object of the present invention to provide an improved elastic membrane which can be easily bent in response to the fluctuation from increase in the internal pressure and absorb the increase in internal pressure even though the non-circular elastic membrane is used, in which when the elastic deformation exceeds a predetermined level, a spring constant can be changed non-linearly in the same manner as the prior art.
- The primary object of the present invention is to overcome the abovementioned problems and to provide a fluid-sealed anti-vibration device comprising a first connecting member secured to a source of vibration, a second connecting member secured to a car body, a substantially cone-shaped elastic body member positioned therebetween, a fluid chamber which is formed by the first connecting member, the second connecting member and the elastic body member, and of which the wall is a part of the elastic body member, the fluid chamber being divided by a partition wall into a main fluid chamber and a sub-fluid chamber, and an orifice provided in the partition wall to communicate with the main fluid chamber and the sub-fluid chamber, characterized in that an elastic horizontally movable membrane is formed in a side wall member which encloses the main fluid chamber in a substantially cylindrical manner, and a control wall is provided in the main fluid chamber to face the horizontally movable membrane at intervals.
- According to a second object of the present invention, the horizontally movable membrane is integrally formed with the elastic body member. At this time, the control wall can be provided integrally with or separately from the partition member. Also, a plurality of horizontally movable membrane can be provided to allow the eigen value of each horizontally movable membrane to be changed.
- According to a third object of the present invention, a circular wall is formed inside the side wall member to face the side wall member at intervals, space provided between the circular wall and the side wall member opens to the main fluid chamber, and a part of the circular wall facing the horizontally movable membrane is the control wall.
- According to a fourth object of the present invention, an elastic membrane is provided on the partition member and adapted to be elastically deformed as a result of the fluctuation of internal pressure in the main fluid chamber, the elastic membrane is formed as a non-circular member with a long side section and a short side section and provided in the central part thereof with a curved groove running substantially parallel to the long side section.
- At this time, on a surface of the elastic membrane opposite to the curved groove, a stopper projection is integrally provided substantially parallel to the curved groove. The stopper projection can be formed only on the long side section. The periphery of the elastic membrane is integrally formed with a continuous, circular peripheral wall that is retained by the partition member, and a clearance can also be provided at the retaining section by the partition member so as to permit deformation of the peripheral wall.
- Further, the partition member is provided with first to third passages of which the first passage is the damping passage for always communicating with the main fluid and sub-fluid chambers, the second passage can be freely opened and closed, and the third passage, of which part is covered by the elastic membrane which is elastically deformable to shut off the communication with the main fluid and sub-fluid chambers, and the elastic membrane is formed as the non-circular member.
- According to the first invention, because a control wall is provided to face a horizontally movable membrane, pressure on the horizontally movable membrane generated as a result of vibration of an elastic body member is controlled by the control wall and the dynamic spring constant is lowered by membrane resonance. As a result, generation of a dynamic spring peak generated in medium frequency range can be controlled.
- As shown in FIGS. 5 and 6, formation of the dynamic spring peak can be freely controlled by changing the size of the control wall. Also, as shown in FIGS. 7 and 8, the dynamic spring peak can be controlled by changing the clearance between the horizontally movable membrane and the control wall. Accordingly, the fluid-sealed anti-vibration device can be regulated by changing the setting of the control wall.
- According to the second invention, a plurality of horizontally movable membranes is provided, wherein if the eigen value of each membrane is changed, the resonance of each horizontally movable membrane is generated in different eigen values and coupled resonance which is wide as a whole is generated. As a result, a low dynamic spring effect can be realized in a wider range. In the present invention, the eigen value is defined as individual resonance frequency, which varies with the size, thickness, materials (spring constant) and the like of the horizontally movable membrane.
- According to the third invention, since a circular wall is formed to face the side wall member, it is easy to position the control wall and the horizontally movable membrane.
- According to the fourth invention, when the internal pressure of the main fluid chamber increases, the elastic membrane is sheared to bend and deform at the curved groove which is located in the center thereof and runs substantially parallel to the long side section, and which serves as a flexural center. In this manner, even though the elastic membrane is formed as the non-circular member with the long and short side sections, it can easily bend in response to the increase in the internal pressure in the main fluid chamber. As a result, it is possible to absorb the increase in internal pressure of the main fluid chamber by utilizing the low dynamic spring effect.
- If the stopper projection is projectingly formed on a surface opposite to the curved groove of the non-circular member, when large vibrations are input to the main fluid chamber, the stopper projection abuts the side of the partition member, whereby the spring constant of the elastic membrane changes nonlinearly and, as a result, the large input can be absorbed. Further, by providing the stopper projection only on the long side section to provide a discontinuous shape, the elastic membrane can be easily bent.
- Since the clearance is provided at the section where the partition member retains the peripheral wall of the elastic membrane, it is possible to realize easier deformation of the elastic membrane. Further, the partition member is provided with first to third passages, of which the first orifice passage is the damping orifice passage for always communicating with the main fluid and sub-fluid chambers, the second passage can be freely opened and closed, and the third passage, of which part is covered by the elastic membrane to shut off the communication with the main fluid and sub-fluid chambers. Thus, by forming the elastic membrane as the non-circular member, it is possible to provide an efficient layout even in such a limited space as that of the partition member where the circular member can not be positioned.
- The above and other objects, and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.
- FIG. 1 is an entire cross-sectional view of a device according to a first embodiment (corresponding to a view taken along line1-1 of FIG. 2);
- FIG. 2 is a plan view of the external appearance of the device;
- FIG. 3 is an enlarged cross-sectional view of basic parts of the device;
- FIG. 4 is a plan view of a partition member section of the device;
- FIG. 5 is a partial cross-sectional view showing the change in height of a control wall of the device;
- FIG. 6 is a graph showing the change in dynamic spring constant caused by the control wall;
- FIG. 7 is a partial cross-section view showing the change in clearance of the control wall;
- FIG. 8 is a graph showing the change in dynamic spring effect caused by the clearance change;
- FIG. 9 is a development elevation depicting two movable membranes shown side by side according to a fourth embodiment; and
- FIG. 10 is a graph showing the effect of the fourth embodiment.
- FIG. 11 is an entire cross-sectional view of an engine mount according to an embodiment;
- FIG. 12 is an enlarged view of Section A of FIG. 11;
- FIG. 13 is a plan view of an elastic membrane according to the embodiment viewed from a side of a main fluid chamber;
- FIG. 14 is a cross-sectional view of the elastic membrane taken along line14-14 of FIG. 13;
- FIG. 15 is a cross-sectional view of the elastic membrane taken along line15-15 of FIG. 13;
- FIG. 16 is a bottom view of the elastic membrane;
- FIG. 17 is a graph showing dynamic spring characteristics in the case of a low amplitude; and
- FIG. 18 is a graph showing damping characteristics in the case of large amplitude.
- Preferred embodiments of the present invention which are provided as an engine mount for an automobile will now be described with reference to the accompanying drawings.
- Referring first to FIGS.1 to 4, an engine mount as a fluid-sealed anti-vibration device has a first connecting
member 1, a second connectingmember 2 and anelastic body member 3. The first connectingmember 1 is secured to an engine (not shown) by ascrew member 4 and the second connectingmember 2 is secured to the automobile body (not shown) by aflange 5. - The
elastic body member 3 is a substantially cone-shaped member constructed of a suitable elastic material such as a known rubber, of which the top section is integrally penetrated by the first connectingmember 1. A lower circumference of theelastic body member 3 is provided with aflange 6 which is integrally connected to aflange metal fitting 7 formed as a part of the second connectingmember 2. A lower section of theelastic body member 3 extends further downward from theflange 6 to form aninner lining section 8 which extends cylindrically and is integrally secured to an inner surface of aside wall member 9. - The
side wall member 9 forms a part of the second connectingmember 2, the outside of which is integrally connected to theflange metal fitting 7 by welding. The circumference of theside wall member 9 is provided withround holes 10 at intervals of 180° in the circumferential direction. Theinner lining section 8 is not supported by theside wall member 9 at theround hole 10 section and forms a horizontallymovable membrane 11 which can undergo free elastic deformation.Round grooves 12 are formed at the circumferential locations of the horizontallymovable membrane 11 corresponding to the inside of the round holes 10 so that the horizontallymovable membrane 11 can be easily deformed. The lower section of theside wall member 9 is integrally secured to aflange 14 of acylindrical base section 13 of the second connectingmember 2 by caulking. The circumference of apartition member 15 and the circumference of adiaphragm 16 are secured to a junction of theside wall member 9 and thecylindrical base section 13. - The
partition member 15 forms amain fluid chamber 17 together with theelastic body member 3 and forms asub-fluid chamber 18 together with thediaphragm 16. Themain fluid chamber 17 and thesub-fluid chamber 18 communicate through anidle orifice 20 for absorbing idling vibration formed in thepartition member 15, and a dampingorifice 21 for absorbing low frequency vibration. Theidle orifice 20 is an opening and closing type of orifice which opens only at the time of idling, while the dampingorifice 21 is always open. - As is obvious from FIGS. 3 and 4, an
outlet 22 of theidle orifice 20 is closed when the top of ahollow valve 24 presses thecentral section 23 of thediaphragm 16 toward theoutlet 22. On the other hand, theoutlet 22 is opened when the inside of thevalve 24 is forced from acommunication passage 26 by a source of negative pressure (not shown) to provide a negative pressure and thevalve 24 is lowered against areturn spring 25 disposed therein, thereby allowing communication with themain fluid chamber 17 and thesub-fluid chamber 18. - The
valve 24 is formed by covering the surface of a cup-shapedcore bar member 27 with anelastic body 28. The lower periphery of theelastic body 28 closely adheres to a lid-shapedmember 29 which engages a bottom section of the first connectingmember 1, so that the inside is maintained in an air-tight condition. A supporting cylindrical metal fitting 30 engages the inside of thecylindrical base section 13. The upper end of the supporting cylindrical metal fitting 30 forms aninner flange 31 whereby the periphery of thediaphragm 16 is positioned between theflange 31 and thepartition member 15. The middle section of themetal fitting 30 is provided with astep 32 projecting inward. The lower end of themetal fitting 30 is bent inward to form a caulking section 33 which overlaps the periphery of the lid-shapedmember 29. Athickened end section 34 formed on the periphery of theelastic body 28 is positioned between thestep 32 and the caulking section 33 whereby theend section 34 is caused to closely adhere to the lid-shapedmember 29. -
Reference numeral 35 in FIG. 1 is a medium and high frequency device, formed in a cup-shape which opens downward. Thedevice 35 is secured to the lower end of the first connectingmember 1 which projects into themain fluid chamber 17. Thedevice 35 is adapted to move vertically together with the first connectingmember 1 so as to generate fluid column resonance in the medium and high frequency range within the clearance formed between the medium andhigh frequency device 35 and theelastic body member 3. -
Reference numeral 36 is a stopper formed at the end of astopper arm 37 which extends in the radial direction from the first connectingmember 1. Thestopper 36 enters astopper bracket 38 formed in an arch shape upward from theflange metal fitting 7 and contacts theflange 6 at the time of large vibration to control deformation of more than a fixed level. - Construction of the
partition member 15 will now be described. As shown in FIGS. 3 and 4, thepartition member 15 is arranged to overlap three members, anupper member 40, anintermediate member 41, and anlower member 42 vertically, with theintermediate member 41 situated between the upper and lower members. Theupper member 40 is constructed of a comparatively rigid plastic material. Aflange 43 is formed on the circumference thereof and acircular wall 44 is formed inside theflange 43 projecting upward. Both theflange 43 and thecircular wall 44 are integrally formed with theupper member 40. Thecircular wall 44 faces theside wall member 9 with a predetermined clearance therebetween and in particular, a part of thecircular wall 44 facing the horizontallymovable membrane 11 forms acontrol wall 44 a of the present invention. - The
circular wall 44 is provided with arecess 45 in the inside thereof, of which the lower surface is formed with anidle orifice groove 46 in a vortex manner. One end of theidle orifice groove 46 forms aninlet 47 which opens into therecess 45, while the other end is guided to the center direction of therecess 45 and opens downward to communicate with theoutlet 22 which is formed substantially in the center of thelower member 42. Theidle orifice groove 46 overlaps theintermediate member 41 located thereunder which closes the open section thereof, thereby forming theidle orifice 20. - The
intermediate member 41 is constructed of a comparatively soft elastic material such as rubber and has agroove 50 which opens upward at a position outside theidle orifice 20. The open end of thegroove 50 is closed by theflange 43 to form a part of the dampingorifice 21. Thegroove 50 communicates with themain fluid chamber 17 through aninlet 51 which is formed in one end of theflange 43 and communicates with the dampingorifice 21 on the side of thelower member 42 at a communicatingopening 52 which is formed in other end of theflange 43. - A border section between an outer peripheral side of an
inner periphery section 48 and thegroove 50 is provided with aslope 49. Theintermediate member 41 is also provided with aslope 41 a at a border section between theidle orifice groove 50 and theflange 43. The faces of the twoslopes - The
lower member 42 is also constructed of comparatively rigid material such as resin in the same manner as theupper member 40. Agroove 53 which opens upward is formed in the outer periphery of thelower member 42 and is closed by the bottom section of theintermediate member 41 to form a part of the dampingorifice 21. The positions of the twogrooves groove 53 communicates with the communicatingopening 52, while the other end forms anoutlet 55 which opens into thesub-fluid chamber 18. - An operation of the present embodiment will now be described. As shown in FIG. 6, a device with the
circular wall 44 is compared with a device without the wall 44 (see a dashed line). In the device with thecircular wall 44, the dynamic spring peak can be remarkably controlled compared with the device without thewall 44. The dynamic spring peak P3 in the case where thecircular wall 44 is not provided is much higher than the peaks P1, P2 in the case where different sizes ofcircular walls 44 are provided. - When the
circular wall 44 is not provided, the total energy of the fluctuations in internal pressure due to the deformation of theelastic body member 3 is added to the horizontallymovable membrane 11 and as a result, the resonance energy of the horizontallymovable membrane 11 becomes large. Thus, the low dynamic spring effect generates a remarkable dynamic spring bottom B3 and as a reaction to this dynamic spring bottom B3, the dynamic spring peak P3 with a high dynamic spring constant is generated. On the other hand, by providing thecircular wall 44, the dynamic spring bottoms B1, B2 in the case where the membrane resonance energy is limited rise higher and as a reaction to this, the dynamic spring peaks P1, P2 become low. Thus, the vertical variation width of the dynamic spring constant becomes small inversely and as a result, equalized low dynamic spring characteristics with a smooth curved line as a whole can be realized. - As a control means for the amount of energy to generate such a membrane resonance, it is possible to change the size of the
circular wall 44 covering the horizontallymovable membrane 11 and to change the distance between thecircular wall 44 and the horizontallymovable membrane 11. As shown in FIG. 5, the height of the circular wall 44 (i.e. the height which correlates with the size for covering he horizontally movable membrane 11) can be optionally set, for example, to the same height as the horizontallymovable membrane 11, i.e. a height of 100% covered (see the solid line) and to a height slightly lower than that of the horizontallymovable membrane 11, i.e. a height of 75% covered (see the broken lie). - The change of the dynamic spring constant according to this setting is shown in FIG. 6. When the height of the
circular wall 44 is set to 100%, the dynamic spring peak is P1 and the dynamic spring bottom is B1. When the height of thecircular wall 44 is set to 75%, the dynamic spring peak is B2 and the dynamic spring bottom is B2. The relationship for the dynamic spring bottom is B1>B2 and for the dynamic spring peak is P1<P2. Accordingly, it is to be noted that the higher the circular wall 44 (namely, the larger the covered percentage), the smaller the gap between the dynamic spring peak and the dynamic spring bottom. - This means that when the internal pressure exerted on the horizontally
movable membrane 11 as a result of deformation of theelastic body member 3 is controlled, the energy related to the resonance of the horizontallymovable membrane 11 is reduced, and thus the more the horizontallymovable membrane 11 is covered, the more the height of the dynamic spring peak is controlled and the energy of the membrane resonance is reduced. By reducing and equalizing the vertical variation width of the dynamic spring constant, it is possible to realize low dynamic spring characteristics with a smooth curved line as a whole. Accordingly, by changing the height of thecircular wall 44, it is possible to optionally adjust the dynamic spring peak. - On the other hand, as shown in FIG. 7, adjustment can be made by changing the distance, i.e. the clearance between the
circular wall 44 and the horizontallymovable membrane 11, with the height of thecircular wall 44 fixed. Namely, when the clearance is changed to Large (solid line), Medium (dashed and dotted line), and Small (dashed line), the dynamic spring constant changes, as shown in FIG. 8, to P4<P5<P6 and B4>B5>B6 in sequence when each dynamic spring peak is P4, P5 and P6 from the clearance Small, and the dynamic spring bottom is B4, B5, and B6 in the same manner as above. Accordingly, it is to be understood that the depression effect of the dynamic spring peak and the equalization effect of the dynamic spring constant change in order of clearance, i.e. Large<Medium<Small. - This means that the smaller the clearance, the more the amount of energy related to deformation of the horizontally
movable membrane 11 out of the energy of the fluctuation in the internal pressure as a result of the elastic deformation of theelastic body member 3 is limited. Accordingly, it is clear that the dynamic spring peak can also be regulated by adjusting the clearance. If the clearance is combined with each change of height, it is further possible to make more accurate adjustment in wider frequency ranges. - FIG. 9 relates to a fourth embodiment and is a development elevation depicting two horizontally
movable membranes 11 facing at intervals of 180°, shown side by side. In this embodiment, when the diameter of one of the horizontallymovable membranes 11A is D1 and the diameter of the other 11B is D2, the relationship between the two horizontally movable membranes is changed to: D1<D2. - With this arrangement, because there is a difference in the eigen values of the horizontally
movable membranes - A case where four horizontally movable membranes are provided at intervals of 90° and their sizes are changed to two, each, large and small, is shown by a long and short dashed line. The dynamic spring peak P8 (highest one is shown) of the coupled resonance is much lower and formed on the high frequency side.
- Thus, if the horizontally movable membranes are combined by changing the eigen value, it is possible to realize a lower dynamic spring effect as a result of the coupled resonance and also to realize a low dynamic spring effect in the wider frequency ranges. Further, adjustment with a high degree of freedom is possible.
- It is to be noted that the present invention is not limited to the embodiments described above, but may be varied in many ways. For example, the
circular wall 44 is not provided, but anindependent control wall 44 a may be provided only at a section where it corresponds to the horizontallymovable membrane 11. In this manner, it is also possible to fully control the resonance of the horizontallymovable membrane 11. Thecontrol wall 44 a or thecircular wall 44 may be provided separately from thepartition member 15. - A third embodiment of the present invention which is provided with an elastic membrane in the partition member. FIG. 11 is an entire cross-sectional view of the engine mount and FIG. 12 is an enlarged view of Section A of FIG. 11. First, in FIG. 11,
reference numeral 101 is a first connecting member which is secured to an engine side by abolt element 102 andreference numeral 103 is a second connecting member secured to a body side by abolt 104. 105 is an elastic body member constructed of a suitable elastic material such as rubber, which has a substantially cone-shapeddome element 106 and acylindrical element 107 following thedome element 106. - The
cylindrical element 107 integrally adheres to an inner peripheral side of a substantially cylindricalrigid body wall 108 of which the outer peripheral side integrally overlaps acylindrical element 103 a formed as a part of the second connectingmember 103. A part of thecylindrical element 103 a and therigid body wall 108 is formed with acircular hole 109 which is covered by a part of thecylindrical element 107. The part of thecylindrical element 107 serves as a movable membrane 110 which is elastically deformable. - The movable membrane110 is covered by a
holder 111 with a substantially funnel-shaped section from the outside of thecylindrical element 103 a. Apipe element 112 projecting outward from the central part of theholder 111 is connected to a switchingvalve 114 a. Switching an atmospheric release or connection to a negative pressure source such as depression at engine manifold can be performed by this switching valve 14 a. - The inside of the
holder 111 forms acontrol chamber 113 which is changed to an atmospheric release condition or to a negative pressure condition by operation of the switchingvalve 114 a. Amovable membrane stopper 115 composed of an elastic member such as rubber is provided between theholder 111 and the movable membrane 110 to control the elastic deformation of the movable membrane 110 at a predetermined level. - An opening section of the
cylindrical element 107 is covered by apartition member 116. Formed between thepartition member 116 and theelastic body member 105 is a mainfluid chamber 120 of which the wall is part of theelastic body member 105. Asub-fluid chamber 122 is formed on the side of thepartition member 116 opposite to the mainfluid chamber 120 and is covered by adiaphragm 121. An incompressible fluid is filled into and sealed in the mainfluid chamber 120 and thesub-fluid chamber 122. Thepartition member 116 is formed by overlapping three members, anupper partition 117, anintermediate partition 118, and alower partition 119 of which each member is composed of a suitable rigid material such as synthetic resin. - In the
upper partition 117, as similarly as above mentioned embodiments, acircular wall 140 is integrally formed projecting upward. Thecircular wall 140 faces theside wall member 108 with a predetermined clearance therebetween and in particular, a part of thecircular wall 140 facing the horizontally movable membrane 110 forms a control wall 141. Between the control wall 141 and the horizontally movable membrane 110, a gap with a predetermined size is formed. Whereby the dynamic spring peak effect as similar as each above mentioned embodiment can be attained. - Formed between the
upper partition 117 and theintermediate partition 118, and between theintermediate partition 118 and thelower partition 119 is a helical dampingorifice passage 123, of which one end communicates with acommon passage 124 formed between theupper partition 117 and theintermediate partition 118 and the other end communicates with thesub-fluid chamber 122 through an opening section (not shown in the figure) formed at a part of thelower partition 119. - The
common passage 124 then communicates with anidle orifice passage 125 which is a second passage formed in theupper partition 117, and with anorifice hall 126 serving as a third orifice passage in sequence. Theorifice hall 126 opens to the mainfluid chamber 120. Therefore, thecommon passage 124 always communicates with the mainfluid chamber 120 and thesub-fluid chamber 122 to generate a damping force relative to vibration with a comparatively low frequency and large amplitude such as suspension vibration, thereby absorbing the vibration. - The bottom section of the
orifice hall 126 is covered by anelastic membrane 127 composed of an elastic material such as rubber whereby the communication of theorifice hall 126 with thesub-fluid chamber 122 is shut off. With the vibration of thiselastic membrane 127, the fluid in theorifice hall 126 generates fluid column resonance in a comparatively higher frequency range such as when a vehicle starts. - An opening section (not shown) of the
idle orifice passage 125 opens to theorifice hall 126 which communicates with the dampingorifice passage 123 through thecommon passage 124 as described above. Although these opening areas are not shown in the figure, the resonance frequency of each fluid column resonance is tuned in order of the relation: theorifice hall 126>theidle orifice passage 125>the dampingorifice passage 123. - The
outlet 128 of theidle orifice passage 125 on the side of thesub-fluid chamber 122 is opened or closed by athick section 121 a which is formed at the central part of thediaphragm 121. When theoutlet 128 is opened, theidle orifice passage 125 communicates with the mainfluid chamber 120 and thesub-fluid chamber 122 to fluid-resonate and absorb the vibrations during idling on a higher frequency side than the dampingorifice passage 123. - Opening and closing operations of the
thick section 121 a mare performed by a separate opening and closingmember 130. The opening and closingmember 130 is so arranged that thethick section 121 a is biased toward the periphery of theoutlet 128 by areturn spring 131 and forms aclosed actuating chamber 132 between itself and abottom member 133 to communicate with apipe element 134 which is formed on the central part of thebottom member 133. Thepipe element 134 is connected to the switchingvalve 114 b to switch the atmospheric release condition or the negative pressure condition. When the insides of theactuating chamber 132 and thecontrol chamber 113 are synchronized for switching, the switchingvalves - When the inside of the
actuating chamber 132 is kept under a negative pressure, the opening and closingmember 130 is lowered downward in the figure against thereturn spring 131 to remove thethick section 121 a from the periphery of theoutlet 128, whereby theoutlet 128 is opened so that theidle orifice passage 125 communicates with the mainfluid chamber 125 and thesub-fluid chamber 122. - By clamping a clamping
flange 108 a formed on the lower section of therigid body wall 108 in the figure and an upper section of a lowercylindrical member 135, thepartition member 116 is fixedly secured between the clampingflange 108 a and a fixingflange member 136 integrally attached to the inner peripheral side of the lowercylindrical member 135. Further, each outer peripheral section of the opening and closingmember 130 and thebottom member 133 is overlapped and secured by clamping the upper and lower ends of aring member 137 which is integrally situated on the inner periphery of the lower section of the lowercylindrical member 135 in the figure.Reference numeral 138 is an air hole formed on the lowercylindrical member 35 so that it overlaps partially thering member 137. - Each of the second connecting
member 103, therigid body wall 108, the lowercylindrical member 135, the fixingflange member 136, and thering member 137 is composed of a suitable material with stiffness properties such as a metal.Reference numeral 139 in the figure is a substantially plate-shaped intermediate and high frequency device that is adapted to generate fluid column resonance between itself and thedome element 106 in intermediate and high frequency ranges. - As shown in FIG. 12, the
elastic membrane 127 of which thebody section 150 crosses the intermediate section of theorifice hall 126 is provided on the central section thereof with acurved groove 151 on the mainfluid chamber 120 side. - A pair of
stopper projections sub-fluid chamber 122 opposite to thecurved groove 151 to position the central section of the elastic membrane therebetween. The outside ends of the stopper projections are provided with abuttingslopes curved recess 154 is formed between thestopper projections body section 150 is formed with athin section 155 and a vertical wall-shapedperipheral wall 156 is provided at the edge section outside thethin section 155 to enclose thebody section 150 circularly. - As shown in these FIGS.13 to 16, the
elastic membrane 127 is formed in an oval shape with a linear long side section 157 and an arc-shaped short side section 158 and acurved groove 151 is formed parallel to and within the range of the long side section 157. In the present invention, the short side section 158 is a radius section connecting the end sections of the long side sections 157, 157, while the short side is a section enclosed by a straight line connecting the end sections of the long side sections 157, 157 and the short side section 158. - The
stopper projection 152 is also paired to position thecurved groove 151 therebetween and is formed parallel to thecurved groove 151 and the long side section 57. Both ends of eachstopper projection 152 in the longitudinal direction are formed as free ends, and no stopper projection is formed connecting these opposing free ends in the short side section 158. - The
thin section 155 and theperipheral wall 156 are circularly formed in succession on the front and back of anelastic membrane 127 and theperipheral wall 156 is formed to project long on two sides. The projecting length of theperipheral wall 156 in the present embodiment is longer than that of thestopper projection 152. - As shown best in FIG. 12, the upper side of this
peripheral wall 156 engages acircular groove 161 formed on forkedsections 60 of theupper partition 117. An innerperipheral section 162 of the forkedsection 160 is provided with a step to narrow the passage cross-section at the intermediate section of theorifice hall 126 and a surface facing thecircular groove 161 is formed with aslope 163 and the end of the innerperipheral section 162 is close to thethin section 155. Theslope 163 serves to allow theperipheral wall 156 which originally stands upright as shown in a vertical line, to bend outward. The end of theslope 163 provides aclearance 164 between itself and theperipheral wall 156 to permit elastic deformation of theperipheral wall 156 when bent inwardly. - On the other hand, the lower side of the
peripheral wall 156 in FIG. 12 engages thecircular groove 166 formed on a forkedsection 165 of thelower partition 119. The innerperipheral section 167 of the forkedsection 165 is provided with a narrow section in the area where a part of the end of the innerperipheral section 167 is close to thethin section 155 of theelastic membrane 127 so that a predetermined clearance is formed between the innerperipheral section 167 and thestopper projection 152. The intermediate section of the innerperipheral section 167 is formed in a slant and astep 168 on a slant to face theabutting slope 153 of theelastic membrane 127 and the lower section thereof is provided with a widened section. - In this manner, when the
elastic membrane 127 undergoes elastic deformation, the right and leftstoppers elastic membrane 127 is deformed as shown in the virtual line of the figure, the abuttingslope 153 first abuts thestep 168 to deform the end section of thestopper projection 152. When the end section is deformed further, theentire stopper projection 152 is pushed to the narrow section on the top of the innerperipheral section 167 and is deformed. - An operation of the present embodiment will now be described. When a comparatively small vibration is input to the main
fluid chamber 120, the internal pressure increases in response to the input of this vibration to push thebody section 150 of theelastic membrane 127 downward from the top side of FIG. 12. Since thebody section 150 is provided on the central section thereof with thecurved groove 151 parallel to the long side section 157, in the cross-section of the short side section of FIGS. 12 and 14, thebody section 150 is sheared to bend using thecurved groove 151 as a fulcrum. - Accordingly, although the long side section157 is linearly secured to the
partition member 116 side over the long area, theelastic membrane 127 easily undergoes elastic deformation in response to the increase of internal pressure of the mainfluid chamber 120 to absorb the increase of the internal pressure, wherein the low dynamic spring effect can be realized. - Further, each end of the
stopper projections stopper projection 152 is not formed on the side of the short side section to provide a discontinuous shape. It is therefore easier to bend the elastic membrane in the direction of the short side section 158. - Since the upper section of the
peripheral wall 156 is pushed to open outward by theslope 163 of the innerperipheral section 162, the initial spring constant of theelastic membrane 127 becomes large. By providing theclearance 164, when thebody section 150 is elastically deformed, the elastic deformation can be further promoted by means of the elastic deformation of theperipheral wall 156. - If larger vibrations are further input, the ends of the
stopper projections slope 153 first abuts against thestep section 168 of the innerperipheral section 167 to elastically deform the end of thestopper projection 152, thereby increasing the spring constant of theelastic membrane 127. - If the
elastic membrane 127 undergoes further elastic deformation, thestopper projections peripheral section 167 for further elastic deformation, thereby increasing the spring constant further. - Accordingly, when large vibrations are input, the spring constant is also non-linearly changed in proportion to the magnitude of the vibration. By increasing the spring constant, the quantity of flow flowing into the damping
orifice passage 123 is increased to generate fluid column resonance in the dampingorifice passage 123, wherein a larger damping force is generated and the vibration is thus absorbed. - FIG. 17 is a graph showing the relation between the dynamic spring constant and the frequency in the case of a small amplitude and FIG. 18 is a graph showing damping characteristics in the case of a large amplitude, wherein a solid line shows the present embodiment, while a broken line shows a comparative example in which the same oval shape as the present embodiment is utilized, but the
curved groove 151 is not provided and the stopper projection is formed circularly. FIG. 17 shows that the present embodiment can realize a remarkable low dynamic spring effect and FIG. 18 shows that almost the same high damping as the prior art can be realized. - As is obvious from these graphs, a low dynamic spring effect in proportion to a small vibration input can be realized. Also, a comparatively large damping force can be generated in proportion to a large vibration input to realize more or less the same high damping as the prior art. It is therefore possible to obtain an ideal low dynamic spring effect and high damping characteristics.
- Further, even though the
partition member 116 is horizontally provided with three passages of the dampingorifice passage 123, theidle orifice passage 125, and theorifice hall 126, if theelastic membrane 127 provided in theorifice hall 126 is formed as an oval, non-circular member, it is possible to arrange theelastic membrane 127 even in difficult layout conditions in which a circularelastic membrane 127 can not be provided.
Claims (9)
1. A fluid-sealed anti-vibration device comprising:
a first connecting member secured to a source of vibration;
a second connecting member secured to a car body;
an substantially cone-shaped elastic body member positioned therebetween;
a fluid chamber which is formed by the first connecting member, the second connecting member, and the elastic body member, and of which the wall is a part of the elastic body member;
the fluid chamber being divided by a partition wall into a main fluid chamber and a sub-fluid chamber; and
an orifice formed in the partition wall to communicate with the main fluid chamber and the sub-fluid chamber;
characterized in that an elastic, horizontally movable membrane is provided in a side wall member which encloses the main fluid chamber in a substantially cylindrical manner, and a control wall is provided in the main fluid chamber to face the horizontal movable membrane at intervals.
2. The fluid-sealed anti-vibration device according to , wherein the horizontal movable membrane is integrally formed with the elastic body member.
claim 1
3. The fluid-sealed anti-vibration device according to , wherein the control wall is formed integrally with or separately from a partition member.
claim 1
4. The fluid-sealed anti-vibration device according to , wherein a plurality of horizontal movable membrane is provided and an eigen value of each horizontal movable membrane is changed.
claim 1
5. The fluid-sealed anti-vibration device according to , wherein a circular wall is formed inside the side wall member to face the side wall member at intervals, space provided between the circular wall and the side wall member opens to the main fluid chamber, and a part of the circular wall facing the horizontal movable membrane is the control wall.
claim 1
6. A fluid-sealed anti-vibration device according to , wherein an elastic membrane is provided on the partition member, adapted to be elastically deformed as a result fluctuation of internal pressure in the main fluid chamber and formed as a non-circular member with a long side section and a short side section and provided in the central part thereof with a curved groove running substantially parallel to the long side section.
claim 1
7. The fluid-sealed anti-vibration device according to , wherein the elastic membrane is integrally provided with a stopper projection on the reverse side of and substantially parallel to the curved groove, and the stopper projection is formed only on the long side section of the elastic membrane.
claim 6
8. The fluid-sealed anti-vibration device according to , wherein a periphery of the elastic membrane is integrally formed with a continuous circular peripheral wall that is retained by the partition member, and a clearance is provided at the retaining section by the partition member to permit deformation of the peripheral wall.
claim 6
9. The fluid-sealed anti-vibration device according to , wherein the partition member is provided with first to third orifice passages, of which the first orifice passage is the damping orifice passage for always communicating with the main fluid chamber and the sub-fluid chamber, the second orifice passage can be freely opened and closed, and the third orifice passage, of which part is covered by the elastic membrane which is elastically deformable to shut off the communication with the main fluid chamber and the sub-fluid chamber, and the elastic membrane is formed as the non-circular member.
claim 6
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPH11-368073 | 1999-12-24 | ||
JP11-368073 | 1999-12-24 | ||
JP36807399A JP4315553B2 (en) | 1999-12-24 | 1999-12-24 | Liquid seal vibration isolator |
JP2000-263529 | 2000-08-31 | ||
JP2000263529A JP4358417B2 (en) | 2000-08-31 | 2000-08-31 | Liquid seal vibration isolator |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010052664A1 true US20010052664A1 (en) | 2001-12-20 |
US6390459B2 US6390459B2 (en) | 2002-05-21 |
Family
ID=26581973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/739,803 Expired - Fee Related US6390459B2 (en) | 1999-12-24 | 2000-12-20 | Fluid-sealed anti-vibration device |
Country Status (4)
Country | Link |
---|---|
US (1) | US6390459B2 (en) |
EP (1) | EP1111267B1 (en) |
DE (1) | DE60014016T2 (en) |
ES (1) | ES2228395T3 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6585242B2 (en) * | 2001-07-16 | 2003-07-01 | Toyo Tire & Rubber Co., Ltd. | Switching type liquid-in vibration isolating device |
US6758466B2 (en) | 2002-11-06 | 2004-07-06 | Lord Corporation | Fluid-elastomeric damper assembly including internal pumping mechanism |
US20050146087A1 (en) * | 2002-11-06 | 2005-07-07 | Lord Corporation | Fluid-elastomeric damper assembly including internal pumping mechanism |
KR20130136474A (en) * | 2010-10-22 | 2013-12-12 | 쿠퍼-스탠다드 오토모티브 인코포레이티드 | Reduced noise decoupler |
US8936235B2 (en) | 2011-03-25 | 2015-01-20 | Sumitomo Riko Company Limited | Fluid-filled type vibration damping device and manufacturing method thereof |
US20170363172A1 (en) * | 2016-06-16 | 2017-12-21 | XCMG American Research Corporation | Viscous isolator with air spring |
US10894153B2 (en) | 2011-11-28 | 2021-01-19 | Hyprotek, Inc. | Port and surface cleaning devices and techniques |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10035026A1 (en) * | 2000-07-19 | 2002-01-31 | Daimler Chrysler Ag | Hydraulically damped elastomer bearing comprises flexible block which connects coaxial outer and inner sleeves, enclosing two chambers filled with damping fluid and connected by throttle channels, one of which contains damping component |
US6820867B2 (en) * | 2001-04-10 | 2004-11-23 | Yamashita Rubber Kabushiki Kaisha | Fluid-sealed anti-vibration device |
US7007934B2 (en) * | 2001-07-02 | 2006-03-07 | Tokai Rubber Industries, Ltd. | Fluid-filled vibration damping device |
JP3841720B2 (en) * | 2002-05-14 | 2006-11-01 | 東海ゴム工業株式会社 | Cylindrical mounting device with bracket |
DE102004001322B4 (en) * | 2004-01-08 | 2014-03-06 | Contitech Vibration Control Gmbh | Acoustic decoupled hydro bearing |
KR100622500B1 (en) * | 2004-12-17 | 2006-09-19 | 현대자동차주식회사 | Engine mounting insulator |
FR2896842B1 (en) * | 2006-02-01 | 2010-04-09 | Hutchinson | HYDRAULIC ANTIVIBRATORY SUPPORT AND METHOD FOR MANUFACTURING THE SAME |
US8142103B2 (en) * | 2009-02-20 | 2012-03-27 | Caterpillar Trimble Control Technologies Llc | Wireless sensor with kinetic energy power arrangement |
US10584761B2 (en) | 2017-01-03 | 2020-03-10 | Beijingwest Industries Co., Ltd. | Vertical decoupler for a hydraulic mount |
DE102018102130A1 (en) * | 2018-01-31 | 2019-08-01 | Vibracoustic Gmbh | Hydraulically damping bearing |
US11959527B2 (en) * | 2018-05-10 | 2024-04-16 | Prospira Corporation | Vibration isolator |
WO2020039648A1 (en) | 2018-08-24 | 2020-02-27 | 住友理工株式会社 | Fluid-filled vibration-damping device |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6015806B2 (en) | 1980-04-14 | 1985-04-22 | 日産自動車株式会社 | Engine mount device with damper |
DE3136305A1 (en) | 1981-09-12 | 1983-03-24 | Hermann Dr.-Ing. 7412 Eningen Klaue | Drive axle for heavy motor vehicles |
JPS5854249A (en) | 1981-09-24 | 1983-03-31 | Toyoda Gosei Co Ltd | Vibro-isolating device sealed with liquid |
JPS6184431A (en) | 1984-09-29 | 1986-04-30 | Tokai Rubber Ind Ltd | Sealed liquid type vibration damping mount |
IT1190546B (en) | 1986-04-29 | 1988-02-16 | Rampini Carlo Spa | SUSPENSION FOR WHEELS OF MOTORIZED AND NON-MOTORIZED VEHICLES |
FR2609515B1 (en) | 1987-01-14 | 1991-07-12 | Caoutchouc Manuf Plastique | ELASTIC ANTIVIBRATORY ISOLATION DEVICE WITH INTEGRATED HYDRAULIC DAMPING AND LIMITS FOR LIMITING INTERNAL TRAVEL |
AT391110B (en) | 1988-10-17 | 1990-08-27 | Graef & Stift | WHEEL GUIDE FOR STEERABLE AND DRIVE WHEELS OF MOTOR VEHICLES |
DE59001480D1 (en) | 1989-08-07 | 1993-06-24 | Volkswagen Ag | INDEPENDENT SUSPENSION OF A STEERED WHEEL OF MOTOR VEHICLES. |
FR2669860B1 (en) | 1990-12-03 | 1993-06-18 | Peugeot | SUSPENSION DEVICE, PARTICULARLY FOR A STEERING WHEEL OF A MOTOR VEHICLE. |
FR2686957B1 (en) | 1992-02-04 | 1995-08-04 | Peugeot | HYDROELASTIC SHIM. |
GB2268566A (en) | 1992-07-02 | 1994-01-12 | Avon Clevite Ltd | Hydraulically damped mounting device |
DE4238752C1 (en) | 1992-11-17 | 1994-05-11 | Boge Gmbh | Hydraulically damping engine mount |
DE69516459T2 (en) * | 1994-07-01 | 2000-09-21 | Bridgestone Corp | Vibration isolation device |
NL1002596C2 (en) | 1996-03-13 | 1997-09-17 | Transport Industry Dev Centre | Vehicle as well as suspension for such a vehicle. |
JP3355286B2 (en) | 1997-04-08 | 2002-12-09 | 山下ゴム株式会社 | Double liquid ring control mount |
BR9813506A (en) | 1997-12-12 | 2000-10-17 | Holland Neway Int Inc | Manually independent front suspension |
-
2000
- 2000-12-20 US US09/739,803 patent/US6390459B2/en not_active Expired - Fee Related
- 2000-12-20 DE DE60014016T patent/DE60014016T2/en not_active Expired - Fee Related
- 2000-12-20 ES ES00127987T patent/ES2228395T3/en not_active Expired - Lifetime
- 2000-12-20 EP EP00127987A patent/EP1111267B1/en not_active Expired - Lifetime
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6585242B2 (en) * | 2001-07-16 | 2003-07-01 | Toyo Tire & Rubber Co., Ltd. | Switching type liquid-in vibration isolating device |
US7931258B2 (en) | 2002-11-06 | 2011-04-26 | Lord Corporation | Fluid-elastomeric damper assembly including internal pumping mechanism |
US20050146087A1 (en) * | 2002-11-06 | 2005-07-07 | Lord Corporation | Fluid-elastomeric damper assembly including internal pumping mechanism |
US7270321B2 (en) | 2002-11-06 | 2007-09-18 | Lord Corporation | Fluid-elastomeric damper assembly including internal pumping mechanism |
US20070273075A1 (en) * | 2002-11-06 | 2007-11-29 | Russell Donald D | Fluid-elastomeric damper assembly including internal pumping mechanism |
US20080143028A1 (en) * | 2002-11-06 | 2008-06-19 | Donald Russell | Fluid-elastomeric damper assembly including internal pumping mechanism |
US6758466B2 (en) | 2002-11-06 | 2004-07-06 | Lord Corporation | Fluid-elastomeric damper assembly including internal pumping mechanism |
US8740200B2 (en) | 2002-11-06 | 2014-06-03 | Lord Corporation | Fluid-elastomeric damper assembly including internal pumping mechanism |
KR20130136474A (en) * | 2010-10-22 | 2013-12-12 | 쿠퍼-스탠다드 오토모티브 인코포레이티드 | Reduced noise decoupler |
KR101936143B1 (en) | 2010-10-22 | 2019-04-03 | 쿠퍼-스탠다드 오토모티브 인코포레이티드 | Reduced noise decoupler |
US8936235B2 (en) | 2011-03-25 | 2015-01-20 | Sumitomo Riko Company Limited | Fluid-filled type vibration damping device and manufacturing method thereof |
US10894153B2 (en) | 2011-11-28 | 2021-01-19 | Hyprotek, Inc. | Port and surface cleaning devices and techniques |
US20170363172A1 (en) * | 2016-06-16 | 2017-12-21 | XCMG American Research Corporation | Viscous isolator with air spring |
US10145441B2 (en) * | 2016-06-16 | 2018-12-04 | XCMG American Research Corporation | Viscous isolator with air spring |
Also Published As
Publication number | Publication date |
---|---|
DE60014016T2 (en) | 2005-11-17 |
EP1111267B1 (en) | 2004-09-22 |
ES2228395T3 (en) | 2005-04-16 |
EP1111267A1 (en) | 2001-06-27 |
DE60014016D1 (en) | 2004-10-28 |
US6390459B2 (en) | 2002-05-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6390459B2 (en) | Fluid-sealed anti-vibration device | |
US6443438B2 (en) | Fluid-sealed anti-vibration device | |
US6491290B2 (en) | Fluid-filled vibration damping device having pressure receiving chamber whose spring stiffness is controllable | |
JPH04262138A (en) | Fluid sealing type mount device | |
US20080093785A1 (en) | Fluid-filled type vibration damping device | |
US6352249B2 (en) | Fluid-filled vibration damping device having pneumatically oscillated cylindrical member | |
EP0930447B1 (en) | Vibration damping device having fluid chambers on opposite sides of partition structure having movable rubber plate | |
US5667205A (en) | Fluid-sealed type anti-vibration rubber device | |
EP1249634B1 (en) | Fluid-sealed anti-vibration device | |
US6131894A (en) | Liquid sealed type rubber mount device | |
JP4016869B2 (en) | Fluid filled engine mount | |
JP4921341B2 (en) | Liquid-filled vibration isolator | |
JP2002070928A (en) | Control type liquid-sealed vibration control device | |
JP4400809B2 (en) | Liquid seal vibration isolator | |
JP4358417B2 (en) | Liquid seal vibration isolator | |
JP4393682B2 (en) | Liquid seal vibration isolator | |
JP2007120566A (en) | Vibration isolator | |
JP3838280B2 (en) | Liquid-filled engine mount | |
JP3161173B2 (en) | Liquid-filled engine mount | |
JPH0729317Y2 (en) | Fluid-filled mounting device | |
JP2004044772A (en) | Liquid seal vibration-proof device | |
JP4315553B2 (en) | Liquid seal vibration isolator | |
JP3477881B2 (en) | Fluid-filled mounting device | |
JP2002250392A (en) | Liquid sealed vibration isolator | |
JP5026837B2 (en) | Resin cylindrical bracket, anti-vibration mount assembly using the same, and method for manufacturing resin cylindrical bracket |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: YAMASHITA RUBBER KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAITOH, JUN;REEL/FRAME:011670/0221 Effective date: 20010205 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20140521 |